CN1277691C - Porous printer - Google Patents

Abstract

A stencil printing machine comprising: a roller rotatable and having an outer peripheral wall formed of an ink-impermeable member, and stencil paper is mounted on the surface of the outer peripheral wall; an ink supply device having a an ink supply unit at a printing position upstream of the maximum printing area on the outer peripheral wall of the roller, and from which ink is supplied to the surface of the outer peripheral wall; a pressing roller, which presses the fed printing medium against the outer circumference on the wall.

Description

Stencil printing machine

technical field

The present invention relates to a stencil printing machine that presses a printing medium onto a roller mounted with a stencil paper while conveying the printing medium, and transfers ink seeped from holes of the stencil paper onto the printing medium.

Background technique

The printing method of traditional stencil printing machine comprises inner press printing method (inner press printing method) (referring to Japanese Patent Laying-Open Publication No. 7-132675) and outer pressing printing method (outer press printing method) (referring to Japanese Patent Laid-Open Publication No. 2001-246828 ).

The following is a brief description of the inner press printing method. As shown in FIG. 1, a conventional internal press printing method stencil printing machine includes a roller 100 and a paper-loaded cylinder 101, which are rotatable and which can be installed so that their outer peripheral surface portions are close to each other. The outer peripheral surface of the roller 100 has a stencil clamping part 100a for clamping one end of the stencil 104, and the outer peripheral wall of the roller 100 other than the stencil clamping part 100a is very soft and penetrates the screen 102 by ink. form.

The ink supply mechanism 105 is located inside the roller 100 . As shown in FIG. 2, the ink supply mechanism 105 has an inner impression cylinder 106 which is an ink supply cylinder and is rotatably mounted in a cylinder support member 107. As shown in FIG. The inner impression cylinder 106 is movable between an impression position and a waiting position. In the embossing position, a force is applied to the cylinder support member 107 in the direction of arrow a shown in FIG. In the waiting position, the cylinder support member 107 is rotated in the direction of arrow b shown in FIG. 2 to separate the inner impression cylinder 106 from the inner peripheral surface of the screen 102 . When the printing paper 111 is delivered and is in the waiting position, the inner impression cylinder 106 gradually approaches the impression position in the remaining time. The inner impression cylinder 106 also has a function of allowing printing pressure to act on the inner peripheral surface of the screen 102 .

Further, the roller support member 107 is rotatably supported by a support shaft 108 as a center and it is mounted with a doctor roller 109 (doctor roller) and a drive rod 110 . The doctor cylinder 109 has a cylindrical shape and is fixed in the vicinity of the inner impression cylinder 106 by the cylinder support member 107 . The drive rod 110 is rotatably supported by the cylinder supporting member 107 and installed in an upper space formed by the outer peripheral surface of the inner impression cylinder 106 and the scraping cylinder 109 on the side close to each other. Ink 103 is supplied to the upper space from an ink supply unit not shown.

Next, the main points of the printing operation will be described in order. A stencil 104 having a hole-formed image is mounted on the outer circumferential surface of the screen 102 . Then, in the printing mode, the roller 100 and the paper loading cylinder 101 rotate synchronously in the direction of the arrow shown in FIG. 1 . Thereafter, the printing paper 111 is fed from between the roller 100 and the paper loading cylinder 101 .

Once the printing paper 111 is fed, the inner impression cylinder 106 presses the screen 102 and rotates with the roll 100 while pressing the screen 102 . The ink 103 flows through the gap between the doctor cylinder 109 and the inner impression cylinder 106 and is supplied onto the outer peripheral surface of the inner impression cylinder 106 . The used ink 103 is continuously supplied onto the inner surface of the screen 102 by the rotation of the inner impression cylinder 106 .

Further, when the inner impression cylinder 106 presses the screen 102, the screen 102 is stretched toward its outer peripheral surface due to the pressure and contacts the paper loading cylinder 101 under the pressure. Then, the printing paper 111 transferred between the roller 100 and the paper loading cylinder 101 is transferred to between the inner impression cylinder 106 and the paper loading cylinder 101 while being in contact with the screen 102 and the stencil paper 104 and being compressed. Due to this contact and pressure, the ink 103 on the screen 102 is transferred on the printing paper 111 through the holes of the stencil paper 104, so that an ink image is printed on the printing paper 111.

Next, the external press printing method will be described. As shown in FIG. 3 , the conventional stencil printing machine of the external press printing method has a roller 120 . There is a stencil clamping portion 120a for clamping one end of the stencil paper 104 on the outer peripheral surface of the roller 120, and the outer peripheral wall of the roller 120 other than the paper clamping part 120a is formed by a perforated ink-permeable film (ink). permeable membrane).

The ink supply mechanism 125 is located inside the roller 120 . The ink supply mechanism 125 has a rotatably supported rubber cylinder 126 and a scraper cylinder 127 adjacent to the rubber cylinder 126 . Ink 128 is stored in an outer circumferential space surrounded by rubber cylinder 126 and doctor cylinder 127 . The ink 128 provided on the outer circumference of the rotating squeegee 126 passes through the gap between the squeegee 126 and the doctor cylinder 127 . Thus, only the ink 128 having a prescribed thickness is supplied on the rubber cylinder 126 , and the ink 128 having a predetermined thickness is supplied onto the inner surface of the outer peripheral wall 120 b of the roller 120 .

Further, the pressing roller 130 is located on the outside of the roller 120 facing the rubber roller 126 . The pressing roller 130 is movable between a pressing position where the pressing roller 130 presses the outer peripheral wall 120 b of the roller 120 and a waiting position where the pressing roller 130 is separated from the outer peripheral wall 120 b of the roller 120 . While the printing paper 111 is being transferred and approaches the waiting position, the pressing cylinder 130 gradually approaches the embossing position in the remaining time. The rubber roller 126 is fastened to a support member that rotatably supports the outer peripheral wall 120 b of the roller 120 . There is a gap between the outer peripheral surface of the rubber roller 126 and the inner surface of the outer peripheral wall 120 b of the roller 120 in a state where the roller 120 is not pressed by the pressing roller 130 . When the outer peripheral wall 120 b of the roller 120 is pressed by the pressing roller 130 , the outer peripheral wall 120 b of the roller 120 bends so that the inner surface of the outer peripheral wall 120 b of the roller 120 gradually contacts the outer peripheral surface of the rubber cylinder 126 .

Next, the main points of the printing operation in the outer press printing method will be described in order. A stencil 104 having a hole-formed image is mounted on the outer surface of the outer peripheral wall 120 b of the roller 120 . Then, in the printing mode, the outer peripheral wall 120b of the roller 120 rotates in the arrow direction shown in FIG.

Once the printing paper 111 is fed, the pressing roller 130 presses the outer peripheral wall 120b of the roller 120, and the outer peripheral wall 120b is bent toward its inner circumference. Due to this movement, the outer peripheral wall 120 b presses the rubber roller 126 , and the rubber roller 126 rotates with the roller 120 . The ink 128 passes through the gap between the doctor cylinder 127 and the rubber cylinder 126 and is supplied onto the outer peripheral surface of the rubber cylinder 126 . Due to the rotation of the rubber roller 126, the supplied ink 128 is continuously supplied onto the inner surface of the outer peripheral wall 120b.

Further, when the pressing roller 130 presses the outer peripheral wall 120b of the roller 120, the printing paper 111 conveyed between the roller 120 and the pressing roller 130 is conveyed between the rubber roller 126 and the pressing roller 130 while being in contact with the stencil paper 104. and was pressed. Due to this contact and pressure, the ink 128 on the outer peripheral wall 120b is transferred to the printing paper 111 through the holes of the stencil paper 104, so that an ink image is printed on the printing paper 111.

Contents of the invention

However, in conventional stencil printing machines of the outer press printing method and the inner press printing method, ink pools are formed in the outer circumferential space between the inner impression cylinder 106 and the doctor cylinder 109 and between the rubber cylinder 126 and the doctor cylinder 127, respectively. outer circumference space. Then, the ink 103 and the ink 128 in the ink pool are supplied to the screen 102 of the roller 100 and the outer peripheral wall 120 b of the roller 120 . Thus, when printing is not performed for a long time, there is a problem that the ink 103 and the ink 128 stored in the ink pool are in contact with the air for a long time, resulting in deterioration of the performance of the ink 103 and the ink 128 .

Further, since different rollers for supplying ink must be arranged in the rollers 100 and 120, there is a problem that it is difficult to make the rollers 100 and 120 small and light.

The present invention can solve the above-mentioned problems. An object of the present invention is to provide a stencil printing machine in which the performance of the ink does not deteriorate even when printing is not performed for a long time, and the roller is small and light.

The stencil printing machine according to the invention has a roll, an ink supply and a press cylinder. The roller is rotatable and has an outer peripheral wall formed by an ink-impermeable membrane. Wax paper is installed on the outer peripheral wall of the drum. The ink supply means has an ink supply unit located upstream of the printing position of the largest printing area on the outer peripheral wall of the roller, and the ink supply means supplies ink from the ink supply unit to the surface of the outer peripheral wall. The pressing roller presses the fed printing medium against the outer peripheral wall.

In such a stencil printing machine, when the printing medium is supplied while the outer peripheral wall of the roller rotates and ink is supplied from the ink supply unit onto the surface of the outer peripheral wall of the roller, the printing medium is pressed while being pressed by the pressing roller. Transfer to the wax paper and the outer peripheral wall of the roller. Simultaneously, the ink between the outer peripheral wall of the roller and the stencil paper spreads downstream in the printing direction while being pressed by the pressing force of the pressing roller. At the same time, the diffused ink seeps out from the pores of the stencil paper and transfers to the printing medium, so that the ink image is printed on the printing medium. The ink provided on the roll remains in a nearly sealed space between the outer peripheral wall of the roll and the stencil. Thus, contact with air is minimized and it is no longer necessary to arrange the various rollers providing ink in the roller wheel.

In a preferred embodiment, an ink leakage preventing groove is arranged on the outer peripheral wall at a position outside the maximum printing area, and the ink leakage preventing groove is covered with stencil paper. In such a stencil printing machine, when the ink between the outer peripheral wall and the stencil leaks beyond the maximum printing area, the leaked ink flows into the ink leakage prevention groove.

The ink leakage preventing grooves are respectively arranged at right and left positions outside the maximum printing area perpendicular to the printing direction. In such a stencil printing machine, the ink leaked from the maximum printing area of the outer peripheral wall in the direction perpendicular to the printing flows into the ink leakage prevention groove.

The ink leakage prevention groove may also be arranged at the printing position downstream of the maximum printing area. In such a stencil printing machine, the ink that has leaked out in the printing direction downstream of the maximum printing area of the outer peripheral wall flows into the ink leakage preventing groove.

The ink leakage preventing grooves may also be arranged on the printing position on the right and left outside the maximum printing area perpendicular to the printing direction and downstream of the maximum printing area. In such a stencil printing machine, the ink leaked from the largest printing area of the outer peripheral wall perpendicular to the printing direction, and the ink leaked from the printing direction downstream of the largest printing area of the outer peripheral wall, flows into the ink seepage prevent grooves.

The ink leakage prevention groove may also be arranged at a printing position further upstream of the ink supply unit upstream of the maximum printing area. In such a stencil printing machine, the ink leaked from the outer peripheral wall in the printing direction upstream of the ink supply mechanism flows into the ink leakage preventing groove.

A plurality of ink leakage preventing grooves may be provided. In such a stencil printing machine, when ink overflows from the ink leakage preventing groove on the inner peripheral side, the overflowed ink flows into the ink leakage preventing groove on the outer peripheral side. Further, in the case of forming a plurality of ink leakage prevention grooves whose total capacity is equivalent to one ink leakage prevention groove, the width of each ink leakage prevention groove is narrow.

An ink recovery device may be provided for recovering ink flowing out of the maximum printing area of the outer peripheral wall. In such a stencil printing machine, excess ink is removed from the outer peripheral wall so that recycling of the ink is possible.

The ink recovery device may have an ink recovery tank at the printing position downstream of the maximum printing area of the outer peripheral wall, and recover ink stored in the ink recovery tank. In such a stencil printing machine, the ink flowing out from the downstream side of the printing due to the pressing of the pressing cylinder is removed from the outer peripheral wall, thereby enabling recycling of the ink.

In the ink recovery tank, an anti-sinking element through which ink can pass may be provided. In this stencil printing press, the stencil is not pressed into the ink recovery tank. In addition, the stencil does not stick to the edge of the ink gutter, so it does not block the ink where it sticks. Therefore, due to the pressing of the pressing roller, the ink can smoothly flow into the ink recovery tank. Additionally, the stencil is not pressed into the ink gutter when the press roller is pressed over the ink gutter.

The sinking prevention member may be flush with the peripheral surface of the outer peripheral wall. In such a stencil printing machine, the press cylinder moves approximately one circumference.

The ink recovery device may recover the ink stored in the ink leakage prevention tank using the leakage prevention tank as the ink recovery tank. In such a stencil printing machine, the ink stored in the ink leakage prevention tank can be surely removed.

The ink supply unit may be provided in a direction perpendicular to the printing on the outer peripheral wall, and supply ink almost uniformly in the direction perpendicular to the printing. In such a stencil printing machine, when the ink is spread downstream in the printing direction due to the pressure of the pressing cylinder, the ink is uniformly spread in the direction perpendicular to the printing.

The ink supply unit may supply ink from a plurality of ink supply ports at intervals in a vertical direction printed on the outer peripheral wall. In such a stencil printing machine, the stencil is not pressed into the ink supply port when the press roller is pressed through the ink supply port.

The stencil printing machine may include an ink volume adjusting device that can control the ink supply amount of the ink supply unit in a direction perpendicular to printing, and control the ink volume adjusting device according to the percentage of perforations on the stencil paper.

In such a stencil printing machine, the ink supply increases with a high perforation percentage area and decreases with a low perforation percentage area. Thus, only the required volume of ink is supplied to the desired area.

The stencil printing machine may include an ink volume adjustment device that can control the supply amount of ink from the ink supply unit in a direction perpendicular to printing, the stencil printing machine controlling the ink volume adjustment device according to the size of the printing medium to be fed.

In such a stencil printing machine, ink is supplied to areas where the current printing medium is located, and ink is not supplied to areas where the current printing medium is not. Therefore, ink is only supplied to the required areas.

The ink supply device and the ink recovery device can always be driven in printing mode. In this stencil printing machine, in the printing mode, ink is continuously supplied to the outer peripheral wall from the ink supply unit, and the ink flowing from the outer peripheral wall into the ink leakage prevention groove is always recovered. In addition, a sufficient volume of ink is always maintained on the outer peripheral wall.

The width of the pressing cylinder can be set to the width between the ink leakage prevention grooves on the right and left sides perpendicular to the printing respectively, so that the pressing cylinder presses the inner sides of the respective outer edges of the two ink leakage prevention grooves. In such a stencil printing machine, when the pressure roller presses the ink leakage prevention groove, the ink leakage prevention groove is not blocked. In the case where the ink recovery device recovers the ink in the ink leakage prevention groove due to the suction force, the pressing roller does not press the outside of the ink leakage prevention groove.

In addition, in this specification, the upstream printing position of the maximum printing area of the outer peripheral wall of the roller refers to the upstream area of the largest printing area in the direction of ink flow on the outer peripheral wall of the roller during printing; the printing downstream area refers to, The downstream area of the maximum printing area in the direction of ink flow on the outer peripheral wall of the roller during printing.

Description of drawings

Fig. 1 is a schematic diagram of the main parts printed by the traditional inner press printing method;

Fig. 2 is the schematic diagram of the ink supply device of traditional inner press printing method;

Fig. 3 is the schematic diagram of the main part printed by the traditional external press printing method;

Fig. 4 is the schematic diagram of the stencil printing machine of the first embodiment of the present invention;

Fig. 5 is the perspective view of the roller of the first embodiment of the present invention;

Fig. 6 is a sectional view taken along line 6-6 in Fig. 5 of the first embodiment of the present invention;

Figure 7 is a cross-sectional view taken along line 7-7 in Figure 5 of the first embodiment of the present invention;

8 is a plan view showing the rollers of the ink supply unit of the first embodiment of the present invention;

Fig. 9 is a sectional view taken along line 9-9 in Fig. 8 of the first embodiment of the present invention;

Fig. 10 is a sectional view showing part of the ink diffusion mechanism according to the first embodiment of the present invention;

11 is a plan view showing rollers of the ink supply unit, revealing a modified mode of the ink supply unit of the first embodiment of the present invention;

Figure 12 is a sectional view taken along line 12-12 in Figure 11, revealing another modified mode of the ink supply unit of the first embodiment of the present invention;

13 is a plan view showing rollers of the ink supply unit, revealing a second modified mode of the ink supply unit of the first embodiment of the present invention;

Figure 14 is a sectional view taken along line 14-14 in Figure 13, revealing a second modified mode of the ink supply unit of the first embodiment of the present invention;

Fig. 15 is a plan view of a part of the roller, revealing a third modified mode of the ink supply unit of the first embodiment of the present invention;

Figure 16 is a sectional view taken along line 16-16 in Figure 15, revealing a third modified mode of the ink supply unit of the first embodiment of the present invention;

Figure 17 is the perspective view of the roller wheel of the second embodiment of the present invention;

18 is a cross-sectional view taken along line 18-18 in FIG. 17 of a second embodiment of the present invention;

Fig. 19 is a sectional view taken along line 19-19 in Fig. 17 of a second embodiment of the present invention;

20 is a schematic diagram of an exploded outer peripheral wall of a roller according to a second embodiment of the present invention;

Fig. 21 is a schematic diagram of an exploded outer peripheral wall of a roller, revealing a first modified mode of the ink leakage prevention groove of the second embodiment of the present invention;

Fig. 22 is a schematic diagram of an exploded outer peripheral wall of a roller, revealing a second modified mode of the ink leakage prevention groove of the second embodiment of the present invention;

Fig. 23 is a schematic diagram of an exploded outer peripheral wall of a roller, revealing a third modified mode of the ink leakage prevention groove of the second embodiment of the present invention;

Fig. 24 is a schematic diagram of an exploded outer peripheral wall of a roller, revealing a fourth modified mode of the ink leakage prevention groove of the second embodiment of the present invention;

Fig. 25 is a schematic diagram of an exploded outer peripheral wall of a roller, revealing a fifth modified mode of the ink leakage prevention groove of the second embodiment of the present invention;

Fig. 26 is a schematic diagram of an exploded outer peripheral wall of a roller, revealing a sixth modified mode of the ink leakage prevention groove of the second embodiment of the present invention;

Fig. 27A is a sectional view of the state where the stencil is pressed into the ink leakage prevention groove;

Fig. 27B is a sectional view of the state where the stencil is not pressed into the ink leakage prevention groove of the sixth improved mode;

Figure 28 is the perspective view of the roller of the third embodiment of the present invention;

29 is a cross-sectional view taken along line 29-29 in FIG. 28 of a third embodiment of the present invention;

30 is a cross-sectional view taken along line 30-30 in FIG. 28 of a third embodiment of the present invention;

Figure 31 is a schematic diagram of the ink recovery device, revealing the first improved mode of the ink recovery device of the third embodiment of the present invention;

Fig. 32 is a schematic diagram of the ink recovery device, revealing a second improved mode of the ink recovery device of the third embodiment of the present invention;

Figure 33 is the perspective view of the roller wheel of the 4th embodiment of the present invention;

34 is a cross-sectional view taken along line 34-34 in FIG. 33 of a fourth embodiment of the present invention;

35 is a cross-sectional view taken along line 35-35 in FIG. 33 of a fourth embodiment of the present invention;

36A-36C disclose the first modified mode of the ink leakage prevention groove of the third and fourth embodiments of the present invention; FIG. 36A is a sectional view of the area near the ink leakage prevention groove; FIG. 36C is a sectional view showing the state of the stencil paper;

37A-37B discloses the second improved mode of the ink leakage prevention groove of the third and fourth embodiments of the present invention; FIG. 37A is a sectional view of the area near the ink leakage prevention groove; FIG. 37B is a plan view, partially The vicinity of the ink leakage prevention groove is clearly revealed;

Fig. 38 is the schematic diagram of the exploded outer peripheral wall of the roller of the fifth embodiment of the present invention;

Fig. 39 is the sectional view of the roller of the sixth embodiment of the present invention;

Fig. 40 is an explanatory diagram of a sixth embodiment of the present invention, revealing that the maximum printing area is divided into six areas;

Fig. 41 is the control block diagram of the sixth embodiment of the present invention;

Fig. 42 is a control block diagram, revealing an improved mode of the sixth embodiment of the present invention;

Fig. 43 is the front view of the roller and pressing roller of the seventh embodiment of the present invention;

Fig. 44 is a front view of the roller and the pressing roller, showing a modified mode of the seventh embodiment of the present invention.

Detailed ways

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 4 , the stencil printing machine is composed of the following components: an initial reading unit 1 , a stencil making unit 2 , a printing unit 3 , a paper feeding unit 4 , a paper feeding unit 5 and a stencil processing unit 6 .

The initial reading mechanism 1 includes an initial positioning tray 10, on which the originals to be printed are stacked; reflective initial sensors 11 and 12 sense the presence of originals on the initial positioning tray 10; The original on the positioning tray 10; a stepping motor 15 drives and rotates the original conveying rollers 13 and 14; a contact image sensor 16 optically reads (optically read) the image data of the original conveyed by the initial conveying rollers 13 and 14 And convert the data into electrical signals; an initial unloading tray 17, on which the originals transported by the initial positioning tray 10 are stacked. The originals stacked on the initial positioning tray 10 are conveyed by the initial conveying rollers 13 and 14, and the contact image sensor 16 reads the image data of the conveyed originals.

The stencil making unit 2 comprises a stencil holder 19 loaded with long, rollable stencils 18; a thermal printing head 20 arranged downstream of the stencil holder 19 in the conveying direction; On the opposite position of the printing head 20; a pair of stencil transfer cylinders 22 and 22, arranged downstream of the platen cylinder 21 and the thermal printing head 20 in the conveying direction; a writing pulse motor 23, driving and rotating the platen cylinder 21 and a stencil transfer roller 22; and a stencil cutter 24 arranged downstream of the stencil transfer rollers 22 and 22 in the transfer direction.

The long stencil 18 is conveyed by the rotation of the platen cylinder 21 and the stencil conveyance cylinder 22 . According to the image data read by the image sensor 16, each dot-shaped heating element of the thermal print head 20 performs a heating operation respectively, and thus the stencil paper 18 is perforated to make a stencil due to its thermal sensitivity. Then, the produced stencil 18 is cut by a stencil cutter 24 to form a stencil 18 having a predetermined length.

The printing unit 3 comprises a roller 26, which is driven by the driving force of the main motor 25 to rotate in the direction of arrow A shown in FIG. One end of 18; A stencil confirmation sensor 28, senses whether stencil 18 is wound, and it is installed on the outer peripheral surface of roller 26; A data position detection sensor 30, detects the data position of roller 26; And a rotary decoder 31. Detect the rotation of the main motor 25. Based on the detection output of the data position detection sensor 30, an output pulse output from the rotary encoder 31 is detected, thereby enabling the rotational position of the roller 26 to be detected.

Furthermore, the printing unit 3 includes a press cylinder 35 which is located below the roller 26 . The pressing roller 35 can move between the embossing position and the waiting position, wherein the embossing position is the position where the pressing roller 35 presses the outer peripheral wall of the roller 26 due to the driving force of the solenoid device 36, and the waiting position is the pressing position. A position where the drum 35 is separated from the outer peripheral wall of the roller 26 . The pressing cylinder 35 is always in the stamping position during the printing mode time (including trial printing), and is in the waiting position during the time other than the printing mode.

Thereafter, one end of the stencil paper 18 conveyed from the stencil making unit 2 is clamped by the stencil paper clamping portion 27, and when the stencil paper 18 is clamped, the roller 26 rotates so that the stencil paper 18 is wound and installed on the outside of the roller 26. on the circumference wall. Then, the printing paper 37 (printing medium) conveyed by the paper feeding unit 4 is pressed on the stencil 18 wound by the pressing roller 35 and mounted on the outer peripheral wall of the roller 26 in synchronization with the rotation of the roller 26 . Thus, the ink 56 is transferred from the holes of the stencil paper 18 to the printing paper 37, so that the image is printed.

The paper feed unit 4 includes a paper feed tray 38 on which printing paper 37 is stacked; first paper feed cylinders 39 and 40 that only convey the uppermost printing paper 37 from the paper feed tray 38; a pair of second paper feed cylinders 41 and 41 The printing paper 37 conveyed by the first paper feeding cylinder 39 and 40 is synchronously transported between the roller 26 and the pressing cylinder 35 with the rotation of the roller 26; a paper feed sensor 42 senses whether the printing paper 37 is on the first Transport between the two feed rollers 41 and 41. The first feed rollers 39 and 40 are installed for the purpose of selectively transferring the rotation of the main motor 25 thereto through a feed clutch 43 .

The paper feeding unit 5 includes a paper-moving claw 44, which removes the printed printing paper 37 from the roller 26; ; A receiving paper tray 46, on which the printing paper 37 transported from the conveying channel 45 is stacked.

The stencil processing unit 6 comprises a transport device 47 for processed stencils, a stencil processing tank 48 and a compression element 49 for processed stencil paper. The processed stencil conveying device 47 guides one end of the used stencil 18 that is not held on the outer peripheral surface of the roller 26 and conveys the guided used stencil 18 while the stencil is detached from the roller 26 . The stencil processing box 48 is loaded with the stencil paper 18 conveyed by the conveying device 47 of the processed stencil. The processed stencil paper compression element 49 pushes the stencil paper 18 delivered to the stencil processing tank 48 by the processed stencil transfer device 47 to the bottom of the stencil processing tank 48 .

As shown in Figures 5-7, the roller 26 has a support shaft 50, which is fixed on the body H (as shown in Figure 4); a pair of side wheels 52 and 52, which are rotatably supported by the support shaft 50 through a bearing 51 a cylindrical outer peripheral wall 53 fixed between a pair of side wheels 52 and 52 ; The outer peripheral wall 53 is driven and rotated by the rotational force of the main motor 25 together with a pair of side wheels 52 and 52 . The outer peripheral wall 53 is also rigid so as not to deform due to the pressure of the pressing roller 35 , and is formed of an ink-impermeable film that does not allow the ink 56 to pass through. In addition, the outer peripheral surface of the outer peripheral wall 53 is subjected to a fluorine-containing resin spraying process, such as polytetrafluoroethylene (registered trademark) spraying process, and is formed into a flat cylindrical surface.

The stencil clamping portion 27 is mounted on a concave portion of a clamping member 53a (clamping 53a) formed on the outer peripheral wall 53 in the axial direction of the support shaft 50. One end of the stencil holding portion 27 is rotatably supported by the outer peripheral wall 53 . The stencil clamping portion 27 protrudes from the outer peripheral wall 53 in a non-clamping state, as shown by the dotted line in FIG. 7 , and does not protrude from the outer peripheral wall 53 in a clamping state, as shown by the solid line in FIG. 7 . Therefore, the stencil holding portion 27 can hold the stencil 18 without protruding from the outer circumferential wall 53 .

The outer peripheral wall 53 is rotated in the direction of arrow A in FIGS. 5 and 7, and the printing start point thereon is set at a position near the stencil holding portion 27, which position can be seen by rotating the outer peripheral wall 53 slightly. Therefore, the rotation direction A is equivalent to the printing direction M, and the area below the printing start point is set as the printing area. In the first embodiment, the maximum printing area is set as an area where A3 size printing paper can be printed. In addition, the ink supply unit 55A of the ink supply device 54 is at an upstream position in the printing direction M of the maximum printing area of the outer peripheral wall 53 .

As shown in Figure 5-9, the ink supply device 54 comprises an ink container 57, stores ink 56 in it; An ink pump 58, its suction ink 56 stored in the ink container 57; The ink 56 that pump 58 sucks; Support shaft 50, it is connected with the other end of first pipe 59, and ink channel 60 and the hole 61 on the position of angle 180 ℃ are arranged in its inside; A rotary joint 63 ( rotary joint), which is rotatably supported on the outer circumference side of the support shaft 50, and has a through hole 62 connected to the hole 61 inside; a second pipe 64, whose one end is connected with the rotary joint 63, and whose other end is connected with the outer The peripheral wall 53 is connected; the ink supply unit 55A, which communicates with the opening at the other end of the second tube 64 . The first tube 59, the support shaft 50, the second tube 64 and the like constitute a pipeline for supplying the ink, and the pipeline is located between the surface of the outer peripheral wall 53 of the roller 26 and the stencil 18 without exposing the ink to the air. .

The ink supply unit 55A includes an ink diffusion groove 65 that diffuses the ink 56 from the second tube 64 in a direction perpendicular to the printing N direction; a plurality of through holes 66 that are spaced at regular intervals in the direction perpendicular to the printing N direction It opens in the ink diffusion groove 65 ; an ink supply port 55 a communicates with a plurality of through holes 66 and opens on the surface of the outer peripheral wall 53 . The ink supply mechanism 55A is covered with the stencil paper 18 to supply ink between the surface of the outer peripheral wall 53 of the roller 26 and the stencil paper 18 without exposing the ink to the air.

As shown in FIGS. 8 and 9 , the ink diffusion groove 65 and the plurality of through holes 66 and the ink supply port 55 a are formed by the ink supply concave portion 67 and the ink distribution member 68 . The ink supply concave portion 67 is formed on the outer peripheral wall 53 in a direction perpendicular to the printing direction M (ie, perpendicular to the printing N), and the ink distribution member 68 is formed inside the ink supply concave portion 67 . The ink supply port 55 a is formed in a direction perpendicular to the printing direction N, and supplies the ink 56 almost uniformly in the direction perpendicular to the printing direction N on the outer peripheral wall 53 .

The operation of the stencil printing machine having the above-mentioned structure will be briefly described below.

First, when the stencil making mode is selected, in the stencil making unit 2 , the stencil paper 18 is conveyed by the rotation of the platen cylinder 21 and the stencil paper conveying cylinder 22 . Then, according to the image data read by the initial reading mechanism 1, a plurality of heating elements of the thermal print head 20 selectively perform a thermal operation so that the stencil paper 18 is punched due to its thermal sensitivity to make a stencil. Therefore, the produced stencil 18 is cut at a predetermined position to obtain a stencil 18 having a predetermined size.

In the printing unit 3, one end of the stencil paper 18 made in the stencil making unit 2 is held by the stencil paper holding portion 27 of the roller 26, and the roller 26 rotates when the stencil paper 18 is held. Then, the stencil 18 is wound and mounted on the outer peripheral wall of the roller 26 .

Next, when the printing mode is selected, in the printing unit 3, the roller 26 is driven and rotated, and the ink supply device 54 starts driving. Then, the ink 56 is supplied to the outer peripheral wall 53 from the ink supply port 55a. Thereafter, the supplied ink 56 remains between the outer peripheral wall 53 and the stencil paper 18, and the pressing roller 35 moves from the waiting position to the embossing position.

In the paper feeding unit 4 , the printing paper 37 is fed between the roller 26 and the pressing cylinder 35 in synchronization with the rotation of the roller 26 . The fed printing paper 37 is pressed against the outer peripheral wall 53 of the roller 26 by the pressing cylinder 35 and is conveyed by the rotation of the outer peripheral wall 53 of the roller 26, that is, when the printing paper 37 is in close contact with the wax paper 18, Printed paper 37 is conveyed.

Further, as shown in FIG. 10, when the printing paper 37 is conveyed, the ink 56 held between the outer peripheral wall 53 of the roller 26 and the stencil paper 18 is squeezed due to the pressure of the pressing cylinder 35, and moves along the printing direction M. downstream diffusion. The diffused ink 56 then seeps out from the pores of the stencil paper 18 and transfers to the printing paper 37 . Thus, the printing paper 37 passes through the process between the outer peripheral wall 53 of the roller 26 and the pressing cylinder 35 , and the ink image is printed on the printing paper 37 . One end of the printing paper 37 passing between the outer peripheral wall 53 of the roller 26 and the pressing cylinder 35 is peeled off from the roller 26 by the paper claw 44, and the printing paper 37 peeled off from the roller 26 is conveyed to the And are stacked on the receiving paper tray 46.

Once the set amount of printing paper is printed, the rotation of the outer peripheral wall 53 of the roller 26 will stop, and the ink supply device 54 will also stop running. Accordingly, the supply of ink to the outer peripheral wall 53 is stopped. The pressing cylinder 35 returns from the embossing position to the waiting position and enters the waiting mode.

When the stencil processing mode is selected to start a new stencil making or similar production, the stencil clamping part 27 of the roller 26 moves to a non-clamping position, and when the roller 26 rotates, the unclamped stencil 18 One end is guided by the processed stencil conveying device 47 and then stored in the stencil processing box 48 .

As explained so far, in the stencil printing machine, the ink 56 is supplied to the outer peripheral wall 53 of the roller 26 and is spread onto the outer peripheral wall 53 by being squeezed by the pressure of the pressing roller 35 , and due to the pressure of the pressing roller 35 The spreading ink 56 is transferred from the holes of the stencil paper 18 to the printing paper 37. Therefore, when the printing mode is completed, the ink 56 supplied to the roller 26 remains in a nearly sealed space between the outer peripheral wall 53 of the roller 26 and the stencil 18, and thus, contact with air becomes minimal. Thus, even when printing is not performed for a long time, the performance of the ink 56 does not deteriorate, and the deterioration of the performance of the ink 56 is certainly prevented. In addition, there is no need to arrange various rollers for supplying ink within the roller 26 as in the conventional embodiment. Therefore, the roller 26 can be made as a compact and lightweight device.

In addition, since the outer peripheral wall 53 of the roller 26 is formed of an ink-impermeable film, its material can be selected from a wide range. In addition, due to the simple structure, the manufacturing cost of the roller 26 will be very low. In addition, since the strength of the roller 26 is easily increased, uneven images caused by fluctuations in printing pressure are prevented.

Furthermore, since the contact of the ink 56 with air is substantially limited to a minimum, the ink 56 is used in optimal conditions with little deterioration. Also, there is a high degree of flexibility in selecting the ink 56 since there is no need to be concerned with preventing the ink 56 from deteriorating.

In the first embodiment, the ink supply unit 55A includes the ink supply port 55a formed in the perpendicular direction to the printing direction N and supplies the ink 56 in the perpendicular direction to the printing direction N through the ink supply port 55a almost uniformly. Therefore, when the ink 56 is spread downstream in the printing direction by being pressed by the pressure of the pressing roller 35, the ink 56 can be spread in the direction perpendicular to N without unevenness. Therefore, uneven density in the direction perpendicular to the printing direction N must be prevented.

In the first embodiment, since the stencil holding portion 27 does not protrude from the surface of the outer peripheral wall 53 of the roller 26, driving the pressing roller 35 can be easily performed. This means that the pressing roller 35 does not need to be moved between the embossing position and the waiting position for each rotation of the roller 26 so that the pressing roller 35 does not hit the stencil nip 27 . For this reason, loss such as noise from the pressing roller 35 and image deterioration due to rebounding can be eliminated.

11 and 12 reveal a first modified mode of the ink supply unit. 11 is a plan view illustrating a roller of the ink supply unit, and FIG. 12 is a sectional view taken along line 12-12 of FIG. 11. Referring to FIG.

As shown in Figures 11 and 12, the ink supply unit 55B of the first improved mode includes a first branch channel 69a, which is connected to the other end of the second tube 64; two second branch channels 69b, which are branched from the first Both ends of the channel 69a are branched in two directions; four third branch channels 69c are branched in two directions from both ends of each of the second branch channels 69b; The two ends of the four third branch passages 69c are branched in two directions and communicate with the branch passage holes at a certain interval in the direction perpendicular to the printing direction N, and they serve as openings on the surface of the outer peripheral wall 53 The ink diffusion supply part.

The ink supply unit 55B of the first modified mode also supplies ink almost uniformly from the ink supply port 55b in the direction perpendicular to the printing direction N of the outer peripheral wall 53 . Therefore, when the ink 56 is diffused downstream in the printing direction M due to the pressure of the pressing roller 35, the ink 56 is diffused in a direction perpendicular to the printing direction N without unevenness. Therefore, uneven density in the direction perpendicular to the printing direction N must be prevented.

Figures 13 and 14 reveal a second modified mode of the ink supply unit. 13 is a plan view illustrating a roller of the ink supply unit, and FIG. 14 is a cross-sectional view taken along line 14-14 in FIG. 13 .

As shown in Figure 13 and Figure 14, the ink supply unit 55C of the second improved mode comprises an ink spreading groove 65, and it spreads the ink from the second tube 64 along the direction perpendicular to the printing N direction; a slit 70, It opens in the direction perpendicular to the printing N direction of the ink diffusion groove 65;

The ink supply unit 55c of the second modified mode also supplies the ink 56 almost uniformly from the ink supply port 55c in the direction perpendicular to the printing direction N on the outer peripheral wall 53 . Therefore, similar to the first modified mode, when the ink 56 is diffused downstream in the printing direction M due to the pressure of the pressing roller 35, the ink 56 is diffused in a direction perpendicular to the printing direction N without unevenness. Phenomenon. Therefore, uneven printing density in the direction perpendicular to the printing direction N must be prevented.

15 and 16 disclose a third modified mode of the ink supply unit. 15 is a plan view showing a portion of a roller of the ink supply unit, and FIG. 16 is a sectional view taken along line 16-16 in FIG. 15. Referring to FIG.

As shown in Figures 15 and 16, the ink supply unit 55D of the third improved mode comprises an ink diffusion groove 65, which diffuses ink from the second tube 64 in a direction perpendicular to the printing N direction; a plurality of ink supply ports 55d is an ink diffusion supply part, one end of which is opened in the ink diffusion groove 65 at a certain interval along the direction perpendicular to the printing N direction, and the other end is opened on the surface of the outer peripheral wall 53 . The ink diffusion groove 65 and the ink supply port 55d are formed by the ink supply concave portion 67 and formed on the outer peripheral wall 53 in a direction perpendicular to the printing N direction, and the ink distribution member 68 is located inside the concave portion 67 .

The ink supply unit 55D of the third modified mode supplies the ink 56 onto the outer peripheral wall 53 in a state where the ink is uniformly spread around the ink supply port 55d. Therefore, when the outer peripheral wall 53 is regarded as a whole in the direction perpendicular to the printing direction N, the ink 56 is supplied almost uniformly in the direction perpendicular to the printing direction N. Therefore, similar to the first modified mode, when the ink 56 is diffused downstream in the printing direction M due to the pressure of the pressing roller 35, the ink 56 is diffused in a direction perpendicular to the printing direction N without unevenness. Phenomenon. Therefore, uneven printing density in the direction perpendicular to the printing direction N must be prevented.

Further, due to the ink supply unit 55D of the third modified mode, when the press roller 35 is pressed to the ink supply port 55d, the press roller 35 is not pressed into the ink supply port 55d. Therefore, pressing noise and vibration of the pressing roller 35 are prevented.

17-20 disclose a second embodiment of the present invention. Figure 17 is a perspective view of the roller, Figure 18 is a cross-sectional view taken along line 18-18 in Figure 17, Figure 19 is a cross-sectional view taken along line 19-19 in Figure 17, Figure 20 is an exploded view of the roller A schematic diagram of the outer peripheral wall.

As shown in FIGS. 17-20 , in the second embodiment, the ink leakage prevention groove 71 is located outside the maximum printing area S of the outer peripheral wall 53 of the roller 26 and covered with the stencil 18 . Further, these ink leakage preventing grooves 71 are located on the right, left and outside of the maximum printing area S in a direction perpendicular to the printing direction N. As shown in FIG. Also, the ink leakage preventing groove 71 is continuously formed along the printing direction M and across an area in the width range of the largest printing area S in the printing direction M. As shown in FIG. More particularly, in order to prevent the ink 56 from leaking out from the ink diffusion groove 65 and the ink supply port 55a, even if the ink 56 spreads in the horizontal direction, the ends of the ink leakage prevention groove 71 are preferentially arranged at least at least in the direction of rotation of the roller. At the same position as the ink supply position. In addition, the ink leakage prevention groove 71 is arranged about 10 mm outside the width of the ink diffusion groove 65 and the ink supply port 55 a of the ink supply unit 55A. It should be noted that the rest of the structure is the same as that of the aforementioned first embodiment. Therefore, the same parts as those of the first embodiment are denoted by the same reference numerals, and detailed explanations are omitted.

In the second embodiment, similarly to the first embodiment, the ink 56 does not deteriorate even if printing is not performed for a long time. Furthermore, the roller 26 can be made both small in size and light in weight.

Furthermore, in the second embodiment, the ink leakage preventing grooves 71 are located on the right and left sides and outside of the maximum printing area S in the direction perpendicular to the printing direction N. Therefore, the ink 56 that leaks out from the maximum printing area S of the outer peripheral wall 53 in the direction perpendicular to the printing direction N enters the ink leakage prevention groove 71, and therefore, the leakage from the side of the outer peripheral wall 53 must be blocked. prevent.

Fig. 21 is a schematic diagram of an exploded outer peripheral wall of a roller, showing a first modified mode of the ink leakage prevention groove of the second embodiment.

As shown in FIG. 21 , the ink leakage prevention groove 72 of the first modified mode is located at the printing position downstream of the maximum printing area S. As shown in FIG. It is at this position that the ink seepage prevention groove 72 is also covered by the stencil 18 . The ink leakage prevention groove 72 is continuously formed in a direction perpendicular to the printing direction N (parallel to the ink supply port 55 a ) and across the width of the maximum printing area S in the printing direction N.

In the first modified mode, the ink 56 leaked from the outer peripheral wall 53 in the printing direction downstream of the maximum printing area S enters the ink leakage preventing groove 72 . Therefore, ink leakage from the end portion of the outer peripheral wall 53 must be prevented.

Fig. 22 is a schematic diagram of an exploded outer peripheral wall of a roller, showing a second modified mode of the ink leakage prevention groove of the second embodiment.

As shown in FIG. 22, the ink leakage preventing grooves 71 and 72 of the second modified mode are a combination of the first embodiment and the second embodiment, and are formed in an approximately inverted U-shape to surround the printing direction. The periphery of the maximum printing area S other than the upstream side of the upper maximum printing area S.

In the second modified mode, the ink 56 leaked from the maximum printing area S of the outer peripheral wall 53 in the direction perpendicular to the printing direction N enters the ink leakage prevention groove 71, and the ink 56 leaks from the maximum printing area S downstream of the printing direction. The ink 56 that has leaked out of the region S enters the ink leakage prevention groove 72 . Therefore, ink leakage from the sides and ends of the outer peripheral wall 53 is more certainly prevented.

Fig. 23 is a schematic view of an exploded outer peripheral wall of a roller, showing a third modified mode of the ink leakage prevention groove of the second embodiment.

As shown in FIG. 23, the ink leakage preventing grooves 71, 72 and 90 are formed in an approximately quadrangular shape so as to surround the entire periphery of the maximum printing area S. As shown in FIG. In particular, compared to the second modified mode, the ink leakage prevention groove 90 is added at the printing position upstream of the maximum printing area S, and between the ink supply port 55a and the stencil holding portion 27. The ink leakage prevention groove 90 is located at a position covered with the stencil paper 18 and is formed in a linear shape in a direction perpendicular to the printing direction N. As shown in FIG.

In the third modified mode, since the ink 56 leaked from the printing direction upstream of the maximum printing area S of the outer peripheral wall 53 enters the ink leakage prevention groove 90, the ink leakage from the upper part of the outer peripheral wall 53 is bound to be blocked. prevent. In particular, in the third modified mode, ink leakage from any direction of the maximum printing area S is prevented. Since ink leakage from the upper portion of the outer peripheral wall 53 is prevented, poor holding, poor stencil installation, and wrinkling of the stencil 18 caused by ink 56 staining the stencil holding portion 27 can be prevented.

Fig. 24 is a schematic diagram of an exploded outer peripheral wall of a roller, showing a fourth modified mode of the ink leakage prevention groove of the second embodiment.

As shown in FIG. 24, similar to the third modified mode, the ink leakage prevention grooves 71, 72 and 90 are formed in a shape surrounding the entire periphery of the maximum printing area S. As shown in FIG. However, compared with the third modified mode, the ink leakage preventing groove 90 is formed in a wave shape instead of a straight line shape.

In the fourth modified mode, similarly to the third modified mode, the ink 56 leaked from the printing direction upstream of the maximum printing area S of the outer peripheral wall 53 enters the ink leakage preventing groove 90 . Therefore, ink leakage from the upper portion of the outer peripheral wall 53 must be prevented. In addition, when the pressing roller 35 is pressed through the ink leakage preventing groove 90 , the pressing roller 35 is not pressed into the ink leakage preventing groove 90 . Therefore, pressing noise and vibration of the pressing roller 35 can be prevented.

Fig. 25 is a schematic diagram of an exploded outer peripheral wall of a roller, showing a fifth modified mode of the ink leakage prevention groove of the second embodiment.

As shown in FIG. 25, similar to the third modified mode, the ink leakage preventing grooves 71, 72 and 90 are formed in a shape surrounding the entire periphery of the maximum printing area S. As shown in FIG. However, compared with the third modified mode, in the direction perpendicular to the printing direction N, the left half and the right half of the ink leakage prevention groove 90 are slightly misaligned in the printing direction M position.

In the fifth modified mode, similarly to the third modified mode, the ink 56 leaked from the printing direction upstream of the maximum printing area S of the outer peripheral wall 53 enters the ink leakage prevention groove 90 . Therefore, ink leakage from the upper portion of the outer peripheral wall 53 must be prevented. Furthermore, similar to the fourth modified mode, when the pressing roller 35 is pressed through the ink leakage preventing groove 90, the pressing roller 35 is practically not pressed into the ink leakage preventing groove 90. Therefore, pressing noise and vibration of the pressing roller 35 can be prevented.

Fig. 26 is a schematic diagram of an exploded outer peripheral wall of a roller disclosing a sixth modified mode of the ink leakage prevention groove of the second embodiment.

As shown in FIG. 26, similar to the third modified mode, the ink leakage prevention grooves 71, 72 and 90 are formed in an approximately quadrangular shape to surround the entire periphery of the maximum printing area S. As shown in FIG. However, compared with the third modified mode, each of the ink leakage prevention grooves 71, 72, and 90 on the right and left sides of the maximum printing area S and on the outer edge positions and on the upstream position is narrow in width and formed on the periphery. The interior or exterior of the perimeter.

In the sixth modified mode, similarly to the third modified mode, the ink 56 leaked from the printing direction upstream of the maximum printing area S of the outer peripheral wall 53 also enters the ink leakage prevention groove 90 . Therefore, ink leakage from the upper portion of the outer peripheral wall 53 must be prevented.

Further, in the sixth modified mode, when the ink 56 in the ink leakage preventing grooves 71a, 71b, 72, 90a, and 90b is recovered due to suction (described in the following embodiment), the stencil paper 18 is pressed Defects into the ink leakage preventing grooves 71a, 71b, 72, 90a and 90b are prevented. In particular, as shown in FIG. 27A, when the ink leakage preventing grooves 71 and 90 have a wide width, the stencil 18 is pressed into the ink leakage preventing grooves 71 and 90 due to suction force or the like. Then, upstream of the embossing position, the action of the suction force on the ink leakage preventing grooves 71 and 90 stops, thereby causing a problem that the ink recovery cannot be completed. On the contrary, as shown in FIG. 27B, when the ink leakage preventing grooves 71a, 71b, 90a and 90b having a small width are arranged in pairs, the stencil paper 18 will not be pressed into the ink leakage preventing grooves 71a, 71b, 90a and 90a. 90b. Therefore, ink recovery can be accomplished without any hindrance. Furthermore, since the ink leakage preventing grooves 71a, 71b, 90a, and 90b are arranged at two positions, approximately the same total amount of stored ink can be ensured.

In the sixth modified mode, the ink leakage prevention grooves 71a, 71b, 90a, and 90b are formed in a pair. However, depending on the toughness of the stencil paper 18, the ink leakage preventing grooves 71a, 71b, 90a, and 90b may be three or more, as usual. Also, in the sixth modified mode, the ink leakage preventing grooves 72 downstream of the maximum printing area S in the printing direction are arranged singly, but may also be arranged in pairs.

28-30 disclose a third embodiment of the present invention. 28 is a perspective view of the roller, FIG. 29 is a cross-sectional view taken along line 29-29 in FIG. 28, and FIG. 30 is a cross-sectional view taken along line 30-30 in FIG.

As shown in Figures 28-30, in the third embodiment, compared with the first embodiment, an ink recovery device for recovering the ink 56 leaked from the maximum printing area S of the outer peripheral wall 53 is added. 73A.

The ink recovery device 73A includes an ink leakage prevention groove 72 formed at a printing position downstream of the maximum printing area S of the outer peripheral wall 53; a third pipe 74 on which one end of the ink leakage prevention groove 72 is opened; The joint 63 is connected to the other end of the third pipe 74 and has a through hole 75 formed thereon; the support shaft 50 rotatably supports the swivel joint 63 and communicates with the through hole 75 formed thereon and the ink passage 76b a hole 76a of the fourth tube; a fourth tube 77, one end of which is connected to the support shaft 50; a filter 80 inserted into the middle of the fourth tube 77 and trapping paper particles (paper particles) and the like; an ink pump 78 (such as gear pump), which is located in the middle of the fourth pipe 77 and sucks the ink 56 in the fourth pipe 77; a recovery container 79, which is connected with the other end of the fourth pipe 77.

The ink leakage prevention groove 72 is located at the same position as that of the first modified mode of the second embodiment. The ink leakage preventing groove 72 is located at the printing position downstream of the maximum printing area S, and is continuously formed in a direction perpendicular to the printing direction N. As shown in FIG. However, one end of the third pipe 74 is connected to the ink leakage preventing groove 72 . Therefore, the ink leakage prevention groove 72 is formed by using the concave portion 81 for recovering the ink and the tube fixing member 82 formed in the concave portion 81 . The rotary joint 63 used here is also used for the ink supply device 54 . The support shaft 50 has a paired tube structure due to ink passages for the ink supply means 54 . Other parts of the structure are the same as the aforementioned first embodiment. Therefore, the same structures are denoted by the same reference numerals, and a detailed explanation thereof is omitted.

In the third embodiment, similarly to the first embodiment, the ink 56 does not deteriorate even if printing is not performed for a long time. Moreover, the roller 26 is small in size and light in weight.

In the third embodiment, there is provided an ink recovering device 73A which recovers the ink 56 leaked from the outside of the maximum printing area S of the outer peripheral wall 53 . Therefore, excess ink 56 is removed from the outer peripheral wall 53 of the roller 26, thereby achieving recycling of the ink 56. In addition, since the ink stored in the ink leakage prevention groove 72 can be removed, it is possible to prevent the ink 56 from overflowing from the ink leakage prevention groove 72 .

In the third embodiment, an ink container 57 for supplying ink and an ink recovery container 79 for recovering ink are provided. Therefore, recovered ink can be recycled.

In the third embodiment, a filter 80 is connected to the passage of the fourth pipe 77 of the ink recovery unit 73A. Ink that does not contain fine particles such as paper is definitely returned to the recovery container 79 . Thus, the quality of the recovered ink is improved. However, the filter 80 is not necessary for the recovered ink, so the filter 80 can be omitted. Furthermore, although the filter 80 is provided for the ink recovering device 83 of the first and second modified modes of the fourth embodiment, the filter 80 may be omitted.

In the third embodiment, when the ink supply device 54 and the ink recovery device 73A are controlled so that they are always driven in the printing mode, ink is continuously supplied to the outer circumference from the ink supply mechanism 55A in the printing mode. wall 53. Then, the ink 56 flowing from the outer peripheral wall 53 into the ink leakage prevention groove 72 is always recovered. Therefore, accumulation of ink 56 on the outer peripheral wall 53 is prevented as much as possible. Also, a sufficient amount of ink 56 can always remain on the outer peripheral wall 53 . Therefore, paper printed with a desired ink density can be obtained even when extensive and continuous printing is performed. Incidentally, an ink leakage prevention groove 72 may be installed in the second embodiment.

Furthermore, although the ink supply unit 55A as the ink supply means 54 in the first embodiment is used in the third embodiment, the ink supply units 55B, 55C, 55C, 55D (FIGS. 11-16) can be used in a third embodiment. Although the ink leakage preventing groove 72 of the first modified mode of the second embodiment is used in the third embodiment, the ink leakage preventing groove 71, 71a, 71b, 72, 90, 90a, 90b (FIGS. 22-27B) can be used in the third embodiment.

Fig. 31 is a schematic view of the ink recovery unit showing a first modified mode of the ink recovery unit of the third embodiment.

As shown in FIG. 31, in the ink recovery device 73B of the first modified mode, the other end of the fourth pipe 77 is connected to the ink container 57 for ink recovery, not to the recovery container. Therefore, recovered ink can be recycled immediately.

Fig. 32 is a schematic view of the ink recovery unit, showing a second modified mode of the ink recovery unit of the third embodiment.

As shown in Figure 32, in the ink recovery device 73C of the second improved mode, one end of the fourth pipe 77 is connected with the ink container 57 for ink recovery, and the vacuum (decompression) that can reduce the pressure in the ink container 57 The pump 82 is used as an ink pump. In this case, the recovered ink can likewise be recycled immediately.

33-35 disclose a fourth embodiment of the present invention. 33 is a perspective view of the roller, FIG. 34 is a cross-sectional view taken along line 34-34 in FIG. 33, and FIG. 35 is a cross-sectional view taken along line 35-35 in FIG.

As shown in FIGS. 33-35, in the fourth embodiment, the only difference from the third embodiment is the structure of the ink leakage preventing grooves 71 and 72 of the ink recovery unit 73A. Similar to the second modified mode of the second embodiment (see FIG. 22 ), the ink leakage prevention groove 72 of the fourth embodiment is formed at the printing position downstream of the maximum printing area S, and is aligned with the printing direction N. formed continuously in the vertical direction. Meanwhile, the ink leakage preventing grooves 71 of the fourth embodiment are formed at positions on the right, left and outside of the maximum printing area S in a direction perpendicular to the printing direction N, and are formed continuously along the printing direction M. Other parts of the structure are the same as the aforementioned third embodiment. Therefore, the same structures are denoted by the same reference numerals, and detailed explanations thereof are omitted.

In the fourth embodiment, similarly to the first embodiment, the ink 56 does not deteriorate even if printing is not performed for a long time. Moreover, the roller 26 is small in size and light in weight. In addition, similarly to the third embodiment, excess ink 56 is removed from the outer peripheral wall 53 of the roller 26, whereby the ink 56 is recycled.

In addition, since the ink 56 stored in the ink leakage preventing grooves 71 and 72 is recovered, overflow of the ink 56 from the ink leakage preventing grooves 71 and 72 is necessarily prevented. Furthermore, compared with the case of the third embodiment, the excess ink 56 leaked from the side of the outer peripheral wall 53 can be recovered, and the leak from the side is further prevented. As usual, in the fourth embodiment, the ink recovery unit 73A may have the same structure as that shown in Figs. 31 and 32 .

36A-36C disclose a first modified mode of the ink leakage preventing grooves of the third and fourth embodiments. 36A is a sectional view of the vicinity of the ink leakage prevention groove; FIG. 36B is a plan view partially revealing the vicinity of the ink leakage prevention groove; FIG. 36C is a sectional view illustrating the state of the stencil.

As shown in FIGS. 36A-36C, since the spiral ring member 92 as the sinking prevention member is fixed in the ink leakage prevention groove 72, the first modified mode is different from that of the third embodiment and the fourth embodiment. Ink leakage preventing groove 72 . Specifically, the spiral ring member 92 is fastened to the ink leakage preventing groove 72 due to its elasticity that presses it into the ink leakage preventing groove 72 . The height of the upper surface of the spiral ring member 92 is set to be the same as or slightly lower than the surface of the outer peripheral wall 53 . Since other structures are the same, the same structures are denoted by the same reference numerals, and detailed explanations thereof are omitted.

In the first modified mode, as shown in FIG. 36A, the stencil paper 18 is not caught in the ink leakage prevention groove 72 by the suction force of the ink recovery means. Therefore, it is possible to prevent the ink recovery efficiency from being lowered due to clogging of the ink recovery channel in the ink leakage prevention groove 72 caused by the stencil paper 18 . Furthermore, as shown in FIG. 36C, the stencil paper 18 is not pasted on the edge of the ink leakage prevention groove 72, and therefore, the ink at the pasted position is not blocked. Therefore, due to the pressing of the pressing roller 35, the ink can smoothly flow into the ink leakage prevention groove 72, so that the ink does not leak out from the end of the outer peripheral wall 53. And, since the ink leakage preventing groove 72 is not pressed into when the pressing roller 35 is pressed through the ink leakage preventing groove 72, the noise of pressing and the vibration of the pressing roller 35 can be prevented.

37A and 37B disclose a second modified mode of the ink leakage prevention groove of the third and fourth embodiments of the present invention. Fig. 37A is a sectional view of the vicinity of the ink leakage prevention groove; Fig. 37B is a plan view partially revealing the vicinity of the ink leakage prevention groove;

As shown in FIGS. 37A and 37B, since the surface of the ink leakage prevention groove 72 is covered with a punching metal 93 (punching metal) as an anti-sinking member, the second modified mode is different from the third embodiment and the fourth embodiment. The ink leakage prevention groove 72 of the first embodiment. The punched metal 93 has many holes 93a through which ink can freely flow into the ink leakage prevention groove 72 from the outside. The surface of the punched metal 93 forms an arcuate shape and is flush with the outer peripheral wall 53 of the roller. Since other structures are the same as those of the third and fourth embodiments, the same structures are denoted by the same reference numerals, and detailed explanations thereof are omitted.

In the second modified mode, as shown in Fig. 37A, the stencil paper 18 is not pressed into the ink leakage preventing groove 72 by the suction force of the ink recovering means. Therefore, it is possible to prevent a reduction in recovery efficiency due to clogging of the ink recovery path of the ink leakage prevention groove 72 by the stencil paper 18 . Moreover, the stencil paper 18 will not stick to the edge of the ink leakage prevention groove 72, so the ink at the sticking position will not be blocked. Therefore, due to the pressing of the pressing roller 35, the ink can smoothly flow into the ink leakage prevention groove 72, so that the ink does not leak out from the end of the outer peripheral wall 53. Also, since the pressing roller 35 is not pressed into the ink leakage preventing groove 72 when it is pressed through the ink leakage preventing groove 72, pressing noise and vibration of the pressing roller 35 are prevented.

Fig. 38 is a schematic diagram of an exploded outer peripheral wall of a roller disclosing a fifth embodiment of the present invention. As shown in Figure 38, in the fifth embodiment, the ink recovery device 73D has an ink recovery groove 94 on the printing position downstream of the maximum printing area S of the outer peripheral wall 53 of the roller, and the structure of the ink recovery device 73D It is advantageous to recover the ink stored in the ink leakage preventing tank 94 . In particular, when the ink leaked from the outside of the maximum printing area S is recovered by using the ink leakage prevention groove 72 in the third and fourth embodiments, leakage from the outside and downstream of the maximum printing area S The discharged ink is recovered by using the ink leakage preventing groove 94 in the fifth embodiment.

Compared with the structure of the third modified mode of the second embodiment, the fifth embodiment has a structure in which the ink leakage preventing groove 94 replaces the ink leakage preventing groove 72 at the same position . The ink leakage prevention grooves 94 include opening portions 94 a arranged in two rows in the printing direction M and arranged at intervals in the direction perpendicular to the printing direction N. As shown in FIG.

For a structure other than the ink leakage prevention groove 94, any one of the ink recovery units 73A-73C explained above can be applied. The same parts as those of the fourth embodiment shown in Fig. 38 are denoted by the same reference numerals for explanation.

In the fifth embodiment, similar to the fourth embodiment, the ink flowing downstream in the printing direction due to the pressing of the pressing roller is removed from the outer peripheral wall 53 of the roller, thereby achieving ink recycling.

Further, in the fifth embodiment, the stencil paper 18 is not pressed into the ink recovery tank 94 by the suction force of the ink recovery device 73D. Therefore, it is possible to prevent a decrease in recovery efficiency due to clogging of the ink recovery path of the ink recovery tank 94 by the stencil paper 18 . And stencil paper 18 can not stick on the limit of ink recovery tank 94, therefore, can not block the ink of sticking position. Therefore, due to the pressing of the pressing roller 35, the ink can smoothly flow into the ink recovery groove 94, so that the ink does not leak out from the end of the outer peripheral wall 53. Also, since the pressing roller 35 is not pressed into the ink recovery groove 94 when it is pressed over the ink recovery groove 94, pressing noise and vibration of the pressing roller 35 are prevented.

39-41 disclose a sixth embodiment of the present invention. Fig. 39 is a sectional view of the roller; Fig. 40 is an explanatory view showing that the maximum printing area is divided into six areas; Fig. 41 is a control block diagram.

As shown in FIG. 39, in the sixth embodiment, ink supply to the ink supply mechanism 55A is accomplished through ink supply passages 83a-83F arranged at equal intervals in a direction perpendicular to the printing direction N. Control valves 84a-84f are attached to the ink supply passages 83a-83F, respectively, wherein each control valve controls the flow rate of ink. When the maximum printing area of the outer peripheral wall 53 is divided into six areas in a direction perpendicular to the printing direction N, six sets of ink supply passages 83a-83F and control valves 84a-84f are arranged at upstream positions of the divided areas, Each set of ink supply channels and control valves is responsible for supplying ink to each segmented area E1-E6 (as shown in FIG. 40 ). In particular, the six control valves 84a-84f function as ink capacity adjusting means to control the ink supply from the ink supply unit 55A in the direction perpendicular to the printing direction N. Opening/closing of the control valves 84a-84f is controlled by a valve controller 85, respectively.

Meanwhile, as shown in FIG. 41, the sixth embodiment has a punching ratio analysis mechanism 86 which detects the pinhole percentage of each of the divided regions E1-E6 based on the image data from the initial reading mechanism 1. . The control unit 87 outputs a command to the valve controller 85 to control the on/off state according to the perforation percentage. For clarity, the control unit 87 sends a command to open the valve more for a high perforation percentage and a command to open the valve less for a low perforation percentage. Note that other parts of the structure are the same as those of the first embodiment. Therefore, the same parts are denoted by the same reference numerals, and a detailed explanation thereof is omitted.

In the sixth embodiment, similarly to the first embodiment, the ink 56 does not deteriorate even if printing is not performed for a long time. And the volume of roller 26 is small, light in weight.

Also, the sixth embodiment has a plurality of control valves 84a-84f for controlling the ink supply amount of the ink supply mechanism 55A in the direction perpendicular to the printing direction N, and each control valve 84a-84f is controlled to conform to Perforation percentage of waxed paper 18. Thus, for areas of high perforation percentage, the ink supply capacity will be increased and for areas of low perforation percentage, the ink supply capacity will be reduced, thus supplying only the required amount of ink 56 to the required areas. Therefore, excessive ink supply can be prevented as much as possible. In particular, efficient ink spreading can be achieved and the possibility of ink leakage is reduced.

Fig. 42 is a control block diagram showing a modified mode of the sixth embodiment.

In this modified mode, there is provided a paper size detecting means 88 which detects the paper size (paper width) of the printing paper on the paper feeding tray. The control unit 87 outputs an instruction to the valve controller 85 to control the ON/OFF state based on the detection result (paper size) from the paper size detection means 88 . For the sake of clarity, the control unit 87 sends a command to open the control valves in the areas that are segmented and have printed sheets, and close the control valves in the areas that are segmented and have no printed sheets. Since the rest of the structure is the same as that of the sixth embodiment, its detailed explanation is omitted.

In a modified mode of the sixth embodiment, a plurality of control valves are provided, which control the ink supply amount of the ink supply mechanism in the direction perpendicular to the printing direction, and each control valve is controlled to conform to the ink to be fed. Printed paper size. Therefore, the ink 56 is supplied to the area where the printing paper is already provided, and is not supplied to the area where the printing paper is not provided. Therefore, the ink 56 is supplied only to the required area, and excessive ink supply is prevented as much as possible. In particular, efficient ink spreading will be achieved and the possibility of ink bleeding is reduced. Incidentally, the control based on the perforation percentage of the sixth embodiment, and the control based on the stencil size of the modified mode of the sixth embodiment can be performed together.

Fig. 43 is a front view of a roller and a pressing roller, revealing a seventh embodiment of the present invention. As shown in FIG. 43, in the seventh embodiment, the width D of the pressing cylinder 35 is set to the width between the ink leakage prevention grooves 71 and 71, wherein the ink leakage prevention grooves 71 and 71 are respectively located in the printing direction N. On the right, left and outside positions of the maximum printing area S in the perpendicular direction, like this, the pressing roller 35 presses the insides of the respective outer edges of the two ink leakage preventing grooves 71 and 71. Specifically, the width D of the pressing cylinder 35 is set to a dimension between the width of the maximum printing area and the dimension between the ink leakage preventing grooves 71 and 71 outer edges located on the right and left sides.

In the seventh embodiment, since the pressing roller 35 does not press the ink leakage preventing grooves 71 and 71 over its entire width, it is possible to prevent the ink in the ink leakage preventing grooves 71 and 71 from being released due to the pressure of the pressing roller 35. Ink leakage prevents overflow in the grooves 71 and 71. The pressing roller 35 does not press the outside of the ink leakage prevention grooves 71 and 71 when the ink recovery device recovers the ink in the ink leakage prevention grooves 71 and 71 by suction. Therefore, the ink leaked from the outside of the ink leakage prevention grooves 71 and 71 is not pressed by the pressing roller 35, and thus, the leaked ink is more likely to be recovered to the ink leakage prevention groove due to the suction force of the ink recovery means. 71 and 71 in.

Fig. 44 is a front view of the roller and pressing roller, showing a modified mode of the seventh embodiment. As shown in FIG. 44, in a modified mode of the seventh embodiment, ink leakage preventing grooves 71a and 71b at positions on the right, left and outside of the maximum printing area S are formed as a pair. The width D of the pressing roller 35 is set to such a size that each right edge and each left edge of the pressing roller 35 presses the ink leakage prevention groove 71a and the outer edge on the inner circumferential side on the right and left positions. The area between the ink leakage prevention grooves 71b on the circumferential side.

With this structure, when the pressing roller 35 presses the area between the ink leakage preventing grooves 71a and 71a on the inner peripheral side, the pressing roller 35 moves. Therefore, the ink spreads evenly to the area between the ink leakage preventing grooves 71a and 71a on the right and left sides, so that uneven printing density can be further prevented. Meanwhile, since the pressing roller 35 does not press the ink leakage preventing grooves 71b and 71b located on the outer peripheral side, the ink leaked from the outside of the ink leakage preventing grooves 71b and 71b is not pressed by the pressing roller 35. Therefore, the leaked ink is more likely to be recovered to the ink leakage prevention grooves 71b and 71b due to the suction of the ink recovery device.

Claims (20)

1. porous printer is characterized in that comprising:

A running roller, it can rotate and have one by the impermeable film formed outer circle wall of printing ink, and on the surface of its outer circle wall paraffin paper is housed;

An ink feeder, it has the inking mechanism on the printing position of a maximum printing area upstream on the outer circle wall that is positioned at running roller, and supply with printing ink to the surface of outer circle wall from this inking mechanism,, institute's supplied ink is not exposed to air so that remaining between the surface of outer circle wall of running roller and the paraffin paper; And

Press pressure roller for one, it is pushed the printed medium of sending on outer circle wall.

2. porous printer according to claim 1 is characterized in that, at least one printing ink seepage prevents that groove is disposed on the outer circle wall of maximum printing area external position, and is covered by paraffin paper.

3. porous printer according to claim 2 is characterized in that, the printing ink seepage prevents that groove is disposed on the position on the outer the right of the maximum printing area vertical with print direction and the left side.

4. porous printer according to claim 2 is characterized in that, the printing ink seepage prevents that groove is disposed on the printing position in maximum printing area downstream.

5. porous printer according to claim 2 is characterized in that, the printing ink seepage prevents that groove is disposed on the printing position in the outer the right of the maximum printing area vertical with print direction and the left side and maximum printing area downstream.

6. porous printer according to claim 2 is characterized in that, the printing ink seepage prevents that groove is arranged on the printing position of more upstream of inking unit of maximum printing area upstream.

7. porous printer according to claim 2 is characterized in that, arranges that a plurality of described printing ink seepages prevent groove.

8. porous printer according to claim 1 is characterized in that, further comprises a printing ink retracting device, is used to reclaim from the maximum printing area of the outer circle wall oil spill China ink that exosmoses.

9. described porous printer according to Claim 8 is characterized in that, the printing ink retracting device has a printing ink accumulator tank and reclaims the printing ink that is stored in the printing ink accumulator tank on the printing position in the maximum printing area downstream of outer circle wall.

10. porous printer according to claim 9 is characterized in that, what be provided with in the printing ink accumulator tank that a printing ink can flow through prevents to be absorbed in element.

11. porous printer according to claim 10 is characterized in that, prevents to be absorbed in element and flushes with the circumferential surface of the outer circle wall of running roller.

12. porous printer according to claim 9 is characterized in that, the printing ink retracting device prevents with the printing ink seepage that groove from reclaiming as the printing ink accumulator tank and is stored in the printing ink seepage and prevents printing ink in the groove.

13. porous printer according to claim 1 is characterized in that, the inking unit along with outer circle wall on the perpendicular direction setting of printing, and almost evenly along and the perpendicular direction of printing supply with printing ink.

14. porous printer according to claim 13 is characterized in that, inking unit a plurality of ink supply ports of space on the vertical direction that is positioned at outer circle wall and prints are supplied with printing ink.

15. porous printer according to claim 13, it is characterized in that, further comprise the ink volume capacity adjusting device, the oil quantity delivered of printing ink of ink supply unit of its control and the perpendicular direction of printing, wherein, the ink volume capacity adjusting device is controlled according to the punching percentage of paraffin paper.

16. porous printer according to claim 13, it is characterized in that, further comprise the ink volume capacity adjusting device, the oil ink supply amount of ink supply unit of its control and the perpendicular direction of printing, wherein, the ink volume capacity adjusting device is controlled according to the size of the printed medium that will be sent to.

17. porous printer according to claim 8 is characterized in that, ink feeder and described printing ink retracting device always are driven under printing mode.

18. porous printer according to claim 3, it is characterized in that, be arranged to be installed in respectively and print right side on the perpendicular direction and the printing ink seepage on left side and the outer fix by the width of pressure roller and prevent width between the groove, so that push the outer peripheral separately inboard that two printing ink seepages prevent groove by pressure roller.

19. porous printer according to claim 1 is characterized in that, the inking unit is sealed by paraffin paper so that supply with printing ink between the surface of the outer circle wall of running roller and paraffin paper printing ink is exposed in the air.

20. porous printer according to claim 1 is characterized in that, ink feeder comprises a pipeline, is used for supplying with printing ink between the surface of the outer circle wall of running roller and paraffin paper and can make printing ink be exposed to air.

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