JPH09314817A - Stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operating efficiency, eliminating an unnecessary cleaning by recording various sets of information obtained at the time of previous printing and interpret, based on the recorded information, whether the cleaning by a cleaning means is necessary, to selectively perform the cleaning. SOLUTION: In cleaning with the help of a cleaning means 22, a drive motor 217 is started to rotate a subframe 181 counterclockwise and thereby, a cleaning roller 205 is brought into contact with a transfer cylinder 5. Further, a cleaning liquid 163 contained in a cleaning liquid tank 153 is applied to the outer peripheral face of the transfer cylinder 5 by rotation of the cleaning roller 205. Next, a wiping roller 189 and a pressing roller 191 are press-contacted with the transfer cylinder 5 and the ink wiped by the wiping roller 189 is transferred to a cleaning cloth 199 taken up on the drive shaft 195 side. In this case, various sets of information obtained at the time of the previous printing are recorded, and the cleaning is performed by interpreting whether the cleaning is necessary based on the recording information, when a power supply is turned on or when printing is once finished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine, and more particularly, to a stencil printing machine equipped with a plate cylinder and a transfer cylinder, which is provided with a cleaning means and determines whether or not cleaning is required by the cleaning means. However, the present invention relates to a device devised to improve the operating rate by eliminating unnecessary cleaning.

[0002]

2. Description of the Related Art Conventionally, there is a stencil printing machine which prints on a printing paper by using a plate cylinder wound with a plate making paper.
The stencil printing machine is easy to operate so that it can be used in a general office, and has the advantage that it can be used in the same manner as a so-called "copier". Therefore, the configuration of the conventional stencil printing machine will be described with reference to FIG. First, there is a document reading unit 301. This document reading unit 301 is configured as a book type image scanner unit, and sets a document for printing at a predetermined position on a document setting surface 303, and the document is read by a cover 305. To fix. Then, an image scanner (not shown) is operated to read data shown on the document as print data.

At a position below the original reading means 301,
Plate making means 307 is provided. That is, first, there is a base paper roller 309, and a stencil base paper (hereinafter abbreviated as base paper) 311 is wound around the base paper roller 309.
A line thermal head 313 and a platen roller 315 are arranged facing each other on the left side of the base paper roller 309 in FIG. Further, a stencil paper cutter 317 and stencil paper feed rollers 319 and 321 are opposed and arranged.
Further, a plate cylinder 323 is arranged, and a plate discharge means 325 is installed on the left side in FIG. A plate discharge box 327 is provided in the plate discharge means 325, and plate discharge rollers 329 and 331 are opposed to and arranged at the entrance of the plate discharge box 327.

In the plate making means 307 having the above structure, the line thermal head 31 based on the print data read by the document reading means 301 described above.
3, a plurality of point heating elements selectively generate heat,
As a result, the base paper 3 supplied from the base paper roller 309
11 is subjected to perforation and plate making. That is, the base paper 311 has, for example, a configuration in which a PET film is attached to one surface side of a nonwoven fabric, and the portion of the PET film is melted and perforated by the heat generated by the point heating element,
Plate making is performed.

The perforated and perforated stencil 311 is supplied to a platen roller 315 and stencil stencil feed rollers 319 and 321.
As a result, the sheet is conveyed in the direction of the plate cylinder 323, and its tip is clamped by a clamp mechanism 333 provided on the plate cylinder 323. When the plate cylinder 323 rotates, the base paper 311 is wound around the outer peripheral surface of the plate cylinder 323. Then, the base paper 311 is cut by the base paper cutter 317 at a preset length.

On the other hand, there is a sheet feeding means 335, and the sheet feeding means 335 has a sheet feeding table 337.
7, a plurality of printing papers 339 are placed in a stacked state. A pickup roller 341 and a sub roller 343 are disposed above the printing paper 339 and on the side of the plate cylinder 323. A pad 345 for sabaki is arranged below the sabaki roller 343. The registration rollers 347 and 349 are opposed to and disposed on the plate cylinder 323 side of the submersion roller 343. The paper feed table 337 is configured to be able to move up and down by a drive motor and a sensor (not shown) so that the uppermost printing paper 339 is always in contact with the pickup roller 341. Then, when supplying the printing paper 339, first, the pickup roller 341 and the sabaki roller 343 are rotated by a drive motor (not shown) to send out the top printing paper 339. At this time, if two or more printing papers 339 are multiply fed, the multiply fed printing papers 339 are separated by the sabaki roller 343 and the sabaki pad 345. A printing unit 351 is provided in the plate cylinder 323, and another cylinder 353 is arranged below the plate cylinder 323 in FIG. On the discharge side of the printing paper 339, a paper discharge means 355 and a paper discharge stocker 357 are provided.

According to the above configuration, the data reading means 301
The print data is read by the
Transfer to. The plate making means 307 performs perforation and plate making on the base paper 311 based on the transferred print data. The perforated and perforated base paper 311 is wound around a plate cylinder 323. On the other hand, the printing paper 339 is supplied from the paper feeding means 335 to the plate cylinder 323.
The paper is supplied by the printing unit 351 while the paper is passed therethrough, and is discharged into the discharge stocker 357 by the discharge unit 355.

[0008]

According to the above-mentioned conventional configuration, there are the following problems. Generally, in offset printing or intaglio printing, if the ink used is left in the air as it is, the ink is completely solidified by oxidative polymerization or by evaporation of the solvent and adheres to the cylinder or blanket cylinder. . Therefore, in offset printing or intaglio printing, it is necessary to wipe off the cylinder, blanket cylinder, etc. immediately after printing is completed. Various proposals have been made for that purpose, and the work itself is performed by a professional printer. On the other hand, in the case of stencil printing as described above, it is a method in which ink is directly applied to the printing paper 339 through the base paper 311, and in particular, a transfer cylinder for transferring a print image is not provided. Therefore, cleaning itself was unnecessary. On the other hand, in addition to the illustrated conventional example, a stencil printing apparatus provided with the above-mentioned transfer cylinder has been proposed, for example, as disclosed in Japanese Patent Application Laid-Open No. 6-48014. However, in JP-A-6-48014, there is no proposal regarding cleaning of the transfer cylinder. Further, there has been proposed one including a transfer cylinder and a cleaning means for cleaning the transfer cylinder.
There is one disclosed in Japanese Patent No. 318898. In this case, cleaning is performed by the cleaning means when printing is completed. However, since the inside of the stencil printing machine is usually invisible, it is often forgotten that the cleaning is performed after the printing is finished, and the power is turned off as it is. In that case, the apparatus stops without being cleaned by the cleaning means after printing. In this case, since the transfer cylinder is not washed, the ink remains on the transfer cylinder, and the print quality at the time of the next printing is deteriorated. Even if the cleaning is performed by the cleaning means, if there is a long time before the next printing, dust or the like may adhere to the transfer cylinder during that time. There was a problem that the quality deteriorated. For such a problem, it may be considered that cleaning by the cleaning unit is always performed before printing, but unnecessarily increasing the cleaning by the cleaning unit may reduce the operation rate of the apparatus. Becomes
In addition, the time required for printing will be lengthened.

The present invention has been made based on such a point, and an object of the present invention is to determine the necessity of cleaning the transfer cylinder by a cleaning means in a stencil printing machine having a plate cylinder and a transfer cylinder. By configuring the transfer cylinder to be cleaned when necessary, it is possible to improve the printing quality, eliminate unnecessary cleaning, improve the operating rate of the device, and reduce the time required for printing. An object of the present invention is to provide a stencil printing apparatus that enables shortening.

[0010]

In order to achieve the above object, a stencil printing machine according to the present invention comprises a plate cylinder around which a base paper that has been plate-made is wound, a transfer cylinder to which a print image is transferred from the plate cylinder, In a stencil printing apparatus comprising: a cleaning means for cleaning the outer peripheral surface of the transfer cylinder on the transfer cylinder, an information recording means for recording various information at the time of previously performed printing, and a recording on the information recording means. It is characterized by further comprising: control means for determining whether or not the cleaning by the cleaning means is necessary based on the obtained information and selectively executing the cleaning by the cleaning means.
At that time, the information recording means is made non-volatile, and the elapsed time from the previous printing is recorded, and the control means is the elapsed time recorded by the information recording means when the entire apparatus is initialized. It is conceivable to determine whether or not a predetermined time set in advance has elapsed based on the above, and to cause the cleaning means to perform cleaning when the predetermined time has elapsed. Further, the information recording means is made non-volatile, and whether the previously performed printing is single-sided printing not using the transfer cylinder or double-sided printing using the transfer cylinder is recorded, and the control means initializes the entire apparatus. When it is determined that the predetermined time has not elapsed from the previous printing when the printing is performed, and when it is determined that the one-sided printing is performed, it is conceivable that the cleaning unit does not perform the cleaning. Further, the information recording means is non-volatile,
The number of cleanings is recorded, and the control unit determines that the predetermined time has not elapsed from the previous printing when the entire apparatus is initialized, determines that the printing is double-sided, and performs the predetermined number of cleanings. If it is determined that the cleaning is being performed, it may be possible not to perform the cleaning by the cleaning unit. Further, the information recording means is made non-volatile, and whether the previously performed printing is single-sided printing not using the transfer cylinder or double-sided printing using the transfer cylinder is recorded, and the control means is provided after the printing is finished once. It is determined whether the one-sided printing or the two-sided printing is performed, and when the one-sided printing is determined, the cleaning by the cleaning unit is not performed. When the two-sided printing is determined, the cleaning by the cleaning unit is performed. It is conceivable that

[0011]

That is, in the case of the stencil printing apparatus according to the present invention, various kinds of information at the time of the previous printing are recorded by the recording means, and when the power is turned on or the printing is temporarily performed based on the recorded information. When the cleaning is completed, the control means determines whether or not the cleaning means needs the cleaning, and the cleaning is performed only when the cleaning is necessary. As various information to be recorded in the recording means,
For example, the elapsed time from the time of the previous printing, whether the previous printing is double-sided printing or single-sided printing, the number of times of cleaning, etc., the control means determines whether or not cleaning by the cleaning means is necessary based on the information. The cleaning is performed only when it is necessary.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing an appearance of a stencil printing apparatus according to the present embodiment,
Its internal structure is schematically shown in FIG.
The stencil printing apparatus according to the present embodiment basically includes two plate cylinders 1 and 3 (a first plate cylinder 1 and a second plate cylinder 3),
A transfer cylinder 5 is provided between the plate cylinders 1 and 3, and around these two plate cylinders 1 and 3 and the transfer cylinder 5, a document reading unit 7, a plate making unit 9, and a plate discharging unit 11 are provided. , 13, paper feeding means 15, printing means 17 and 19, paper discharging means 21, cleaning means 22 and the like. The plate cylinders 1, 3 and the transfer cylinder 5 all have the same outer diameter.

The configuration of each section will be described in detail below. First, the document reading means 7 is configured as a book type image scanner unit, and a document to be printed is placed at a predetermined position on the document setting surface 23. And the original is fixed by the cover 25. Then, an image scanner (not shown) is operated to read data shown on the document. Alternatively, in the case of a sheet-shaped document, the sheet-shaped document is placed on the document tray 24, conveyed to a predetermined position on the document set surface 23 by a conveying means (not shown), set, and data is read in the same manner as described above. To go.

Below the original reading means 1, the above-described plate making means 9 is arranged. That is, first, there is a base paper roller 27, and the base paper roller 27
Is wound. A line thermal head 31 and a platen roller 35 are opposed to and arranged on the left side of the base paper roller 27 in FIG. Furthermore, the stencil paper cutter 37,
The stencil paper feed rollers 39 and 41 are opposed and arranged. On the left side of FIG. 2 with respect to the plate cylinder 1, the above-described plate discharging means 11 is installed.
Has a plate discharge box 43, and plate discharge rollers 45 and 47 are opposed to and arranged at the entrance of the plate discharge box 43.

In the plate making means 9 having the above structure, a plurality of point heating elements provided in the line thermal head 31 selectively generate heat based on the print data read by the document reading means 7 already described. As a result, the base paper 29 supplied from the base paper roller 27 is perforated and plate-formed. That is, the base paper 29 has, for example, a configuration in which a PET film is adhered to one surface side of a nonwoven fabric, and a portion of the PET film is melted and perforated by the heat generated by the point heating element, thereby forming a plate. Is what is done.

The perforated and perforated stencil 29 is conveyed in the direction of the plate cylinder 1 by a platen roller 35 and stencil feed rollers 39 and 41, and the leading end thereof is clamped by a clamp mechanism 49 provided on the plate cylinder 1. Is done. Then, as the plate cylinder 1 rotates, the base paper 29 is wound around the outer peripheral surface of the plate cylinder 1. Then, the sheet is cut by the base paper cutter 37 at a predetermined length. Since the plate discharging means 13 has the same configuration as the plate discharging means 11, the same reference numerals are given to the same parts in the figure, and the description thereof will be omitted.

Next, the configuration of the sheet feeding means 15 will be described. First, there is a paper feed table 51, and on this paper feed table 51,
A plurality of printing papers 53 are placed in a stacked state. Further, a pickup roller 55 and a sabaki roller 57 are disposed above the printing paper 53 and on the transfer cylinder 5 side. Below the separation roller 57, a separation pad 59 is arranged. Sabaki Roller 57
The registration rollers 61 and 63 are opposed to the transfer cylinder 5 side.
Are located. The paper feed table 51 is configured to be able to move up and down by a drive motor and a sensor (not shown) so that the uppermost printing paper 53 is always in contact with the pickup roller 55.

When supplying the printing paper 53, first, the pickup roller 55 and the sabaki roller 57
Are rotated by a drive motor (not shown) to feed out the uppermost printing paper 53. At that time, if two or more printing papers 53 are fed in a double feed, the separation roller 57
And the printing paper 5 double fed by the pad 59 for Sabaki
3 is separated. That is, it is set so that only one sheet of printing paper 53 can pass between the sabaki roller 57 and the sabaki pad 59. Therefore, the registration roller 6
Only one sheet of printing paper 53 is supplied to the sides 1 and 63. Then, the leading end of the supplied printing paper 53 is
When reaching the contact position between the registration rollers 61 and 63, the rotation of the pickup roller 55 and the rotation roller 57 is temporarily stopped to enter a standby state. Then, when the paper feed timing is reached in accordance with the rotation timing of the plate cylinders 1 and 3 and the transfer cylinder 5 side, the registration rollers 61 and 63 are rotated by a drive motor (not shown), and the printing paper 53 is printed. It is supplied between the cylinder 1 and the transfer cylinder 5.

Here, the rotational driving of the plate cylinders 1 and 3 and the transfer cylinder 5 will be described. First, as shown in FIG. 3, a driving motor 65 is provided, and a pulley 67 is fixed to a rotating shaft of the driving motor 65. Have been. On the other hand, a pulley 69 is coaxially fixed to the transfer drum 5 side, and a belt 71 is wound around the pulley 69 and the pulley 67. Accordingly, when the drive motor 65 is driven to rotate, the transfer cylinder 5 is rotated in the direction indicated by the arrow a in FIG. 3 via the pulley 67, the belt 71, and the pulley 69. A gear 73 is coaxially fixed to the transfer cylinder 5.
A gear 75 meshes with 3, and a gear 77 meshes with this gear 75. A gear 79 is coaxially fixed to the plate cylinder 1, and the gear 79 meshes with the gear 77. Therefore, when the transfer cylinder 5 rotates,
Through the gears 73, 75, 77, 79, the plate cylinder 1 rotates in the direction indicated by the arrow b in FIG.

Similarly, a gear 81 is engaged with the gear 73, and a gear 83 is engaged with the gear 81.
A gear 85 is coaxially fixed to the plate cylinder 3, and the gear 85 meshes with the gear 83. Therefore, when the transfer cylinder 5 rotates, the gears 73, 81, 83,
Through the plate 85, the plate cylinder 3 rotates in the direction indicated by the arrow c in FIG. Regarding the drive transmission mechanism,
This is merely an example, and various rotation transmission configurations are conceivable.

Next, the configuration of the printing units 17 and 19 will be described. Since the printing units 17 and 19 have the same configuration, the printing unit 17 will be described as an example. As shown in FIGS. 2 and 4, inside the plate cylinder 1, a squeegee roller 87, a doctor roller 89, a lift roller 91, a lift cam 93, a lift lever 95, a lever return spring 97,
A lever detection sensor 99 is incorporated. As shown in FIG. 5, frames 101 and 103 are built in the plate cylinder 1, and other frames 105 and 107 are fixed to the angle 109 by screws 111 and 113. The angle 109 is a rail 12 fixed between the frames 115 and 117 by screws 119 and 121.
5 is arranged via rollers 125 and 127 so as to be movable in the left-right direction in FIG.

The doctor roller 89 is provided between the frames 101 and 103 by bearing members 129 and 131.
Is rotatably supported via shafts 89a, 89a. Further, the squeegee roller 87 is rotatably supported between the lift levers 95, 95 by bearing members 133, 135 via shafts 87a, 87a. Further, ink 137 is appropriately supplied to a contact point between the doctor roller 89 and the squeegee roller 87 from an ink supply mechanism (not shown).

At the time of printing standby, the state is as shown in FIG. 4, in which the convex surface of the lift cam 93 pushes up the lift roller 91, and the lift lever 95 shields the sensor 99. On the other hand, at the time of printing, first, as shown in FIGS.
Are rotated by a drive motor (not shown), whereby the meshing gear 141 is rotated. Lift cam 9
3 is coaxially fixed to the gear 141, so that the rotation of the gear 141 causes the lift cam 93 to rotate. Then, the lift cam 93 rotates by 180 ° from the state shown in FIG. By the rotation of the lift cam 93, the upward bias on the lift roller 91 is released, so that the lift lever 95 is moved to the lever return spring 97.
The squeegee roller 87 is moved downward in the figure as shown in FIG. Then, the plate cylinder 1 acts so as to be pressed against the transfer cylinder 5. At the same time, the shield of the sensor 99 is released. Printing is performed in such a state.
As described above, the printing unit 19 has the same configuration, and the same parts are denoted by the same reference numerals and description thereof is omitted. However, printing on the plate cylinder 1 side is performed on the surface of the printing paper 53 supplied by the paper feeding means 15 between the plate cylinder 1 and the transfer cylinder 5, whereas The printing on the third side is performed on the transfer cylinder 5, and the image once transferred to the transfer cylinder 5 is printed on the back surface of the printing paper 53.

Next, the configuration of the paper discharging means 21 will be described. The paper discharging means 21 includes a printing paper separating claw 143 and the paper discharging guide 1.
45, a paper discharge tray 147, and a paper discharge stopper 149. The printed printing paper 53 is peeled off from the transfer drum 5 by the paper separating claw 143 when the printing paper holding means 151 provided on the transfer drum 5 opens its leading end. Printing paper 53 peeled off
Are guided by the paper ejection guide 145 and fly until they collide with the paper ejection stopper 149, and after being collided with the paper ejection stopper 149, are stacked on the paper ejection table 147.

Next, the structure of the cleaning means 22 will be described. First, there is a cleaning liquid tank 153, and a detection tank 154 is installed in the cleaning liquid tank 153 in a communicating state. A sensor 155 is installed in the detection tank 154, and the sensor 155 includes a light projecting section 155a and a light receiving section 155b.
Further, the actuator 157 having a substantially L shape is provided with the shaft member 15
9, the float 161 is attached to one end of the actuator 157, and the other end can be retracted between the light projecting portion 155a and the light receiving portion 155b of the sensor 155. It is located in. The float 161 floats on the surface of the cleaning liquid 163 contained in the detection tank 155. When the level of the cleaning liquid 163 decreases, the float 1
61 also descends accordingly, so that the other end of the actuator 157 causes the light projecting portion 15 of the sensor 155 to move.
It penetrates between 5a and the light receiving portion 155b to block light. Thereby, the sensor 155 detects the drop of the liquid level. On the other hand, when the cleaning liquid 163 in the detection tank 155 is sufficiently present and the liquid level is rising,
The float 161 also rises accordingly, so that the other end of the actuator 157 is connected to the sensor 155.
It comes out from between the light projecting section 155a and the light receiving section 155b. In other words, the transmission of light is allowed,
Detection by the sensor 155 is not performed.

The detection tank 154 has a cleaning liquid cartridge 16 set in a cartridge holder 165.
The cleaning liquid is supplied from 7. The cartridge holder 1
The cleaning liquid supply pump 1 is provided between the detector 65 and the detection tank 154.
69 is inserted. And the cleaning liquid cartridge 1
67 is set in the cartridge holder 165 in the reverse direction. As a result, the thin film 173 on the cleaning liquid cartridge 167 side is broken by the sharp protrusion 171 provided on the cartridge holder 165 side, whereby the cleaning liquid 163 in the cleaning liquid cartridge 167 flows out. After that, by activating the cleaning liquid supply pump 169, the cleaning liquid 163 is transferred to the detection tank 154 side.
Will be supplied. Also, the cleaning liquid supply pump 169
Is turned on and off by the sensor 155 described above. That is, when the sensor 155 detects a decrease in the liquid level of the cleaning liquid 163 in the detection tank 154, the cleaning liquid supply pump 169 is turned on, and when the liquid level rises, it is turned off. The cleaning liquid tank 1
53 and the detection tank 154 are connected via a pipe 175, the detection tank 154 and the cleaning liquid supply pump 169 are connected via a pipe 177, and the cleaning liquid supply pump 169 and the cartridge holder 165 are connected via a pipe 179. Has been done.

On the other hand, there is a sub-frame 181, and this sub-frame 181 is rotatably attached to a main frame (not shown) by a pin 183 in the direction indicated by arrow a'in FIG. The subframe 18
1 has a wiping roller frame 185 and a pin 18
7, a rubber-made wiping roller 189 is rotatably attached to the tip of the wiping roller frame 185. A rubber pressing roller 191 is rotatably attached to the sub-frame 181. Further, a drive shaft 195, a driven shaft 193, and a pinch roller 197 are arranged on the sub-frame 181, and the cleaning cloth 199 wound around the driven shaft 193 side passes through the pressing roller 191 and the pinch roller 197. And is wound around the drive shaft 195. The drive shaft 195 is provided with a mechanism that applies a tension to the cleaning cloth 199 to rotate the cleaning cloth 199 without causing slack. Also, the pressing roller 191, the wiping roller 18
Reference numeral 9 is configured to be capable of being brought into contact with and separated from the transfer cylinder 5, and is configured to be movable relative to a position shown by a solid line and a position shown by an imaginary line in FIG.

Further, a cleaning roller frame 201 is attached to the main frame via a pin 203 so as to be rotatable in a direction indicated by an arrow b'in FIG. The cleaning roller 205 is attached to the tip of the cleaning roller frame 201.
Is rotatably attached to the cleaning roller 20.
A cam follower 207 is attached to the outer periphery of 5. Further, a cleaning liquid replenishing roller 209 and a cleaning liquid supply roller 211 are arranged in the cleaning liquid tank 153, and the cleaning liquid 163 in the cleaning liquid tank 153 is transferred to the cleaning roller 205 via the cleaning liquid replenishing roller 209 and the cleaning liquid supply roller 211. Is configured to supply. A drive pin 213 is attached to the lower end of the cleaning roller frame 201, and the drive pin 213 has a structure related to a cam 215 formed on the sub-frame 181 side. The cleaning roller frame 201 is
The urging force of an elastic member (not shown) is always urged counterclockwise in FIG.

A drive motor 217 is provided, and a gear 219 is fixed to an output shaft 217a of the drive motor 217, and a gear 221 is meshed with the gear 219. A gear 223 fixed to the sub-frame 181 meshes with the gear 221. Then, the gears 219, 221, 223 are rotated by driving the drive motor 217 under the control of a controller (not shown).
The sub-frame 181 is rotated in the direction of the arrow a ′ via the. In FIG. 1, a single-sided printing start switch 241, a double-sided printing start switch 243, a front plate replacement switch 245, a back plate replacement switch 247, a cleaning liquid run-out lamp 249, a cleaning cloth run-out lamp 251, a buzzer 253, an LED 255, and a print number setting switch. 257 are arranged respectively, and a display screen 259 and a ten key 261 are provided. Further, in the control means (not shown), a non-volatile memory and a clock timer are built in, and the non-volatile memory records the number of washings and whether the previous printing was double-sided printing or single-sided printing. ,
Further, the time counting timer records the elapsed time from the end of the previous printing.

The operation in the case of performing double-sided printing will be described based on the above configuration. First, a document to be printed on the surface of the printing paper 53 is set on the document setting surface 23, covered with the cover 25, and in this state, the document is read by an image scanner (not shown). The read print data is converted into an electric signal and transferred to the line thermal head 31 of the plate making means 9. On the other hand, the base paper 29 is supplied from the base paper roll 27, and the line thermal head 31 punches and plate-makes the base paper 29. The perforated and perforated stencil 29 is rolled by the rollers 39 and 41 to form the plate cylinder 1.
, And is sucked and held by the clamp mechanism 49 of the plate cylinder 1. After that, by rotating the plate cylinder 1,
The perforated and plate-made base paper 29 is wound around the outer periphery of the plate cylinder 1,
It is adsorbed and held by the ink adhering to the surface.

Next, the original for printing on the back side of the printing paper 53 is set on the original setting surface 23, and the cover 25 is set.
Then, the original is read by an image scanner (not shown). The read print data is converted into an electric signal and transferred to the line thermal head 31 of the plate making means 9. On the other hand, the base paper 29 is supplied from the base paper roll 27, and the base paper 29 is subjected to perforation and plate making by the line thermal head 31. The perforated and perforated base paper 29 is conveyed in the direction of the plate cylinder 1 by rollers 39 and 41, and is sucked and held by the clamp mechanism 49 of the plate cylinder 1. Up to this point, the process is the same as that for the front side printing, but from there, the perforated and perforated base paper 29 is transferred to another plate cylinder 3 via the transfer cylinder 5 and wound. That is, the base paper 29 held by the clamp mechanism 49 of the plate cylinder 1 is transferred to the electrostatic attraction plate 217 of the transfer cylinder 5.
And then transferred to the clamping mechanism 49 of the plate cylinder 3, and then wound around the outer peripheral surface of the plate cylinder 3. In addition, the plate cylinder 1, the transfer cylinder 5, and the plate cylinder 3 have the same outer diameter and are configured to be synchronously driven to rotate.
Therefore, each of the clamp mechanism 49 and the electrostatic suction mechanism 21
7. By disposing the clamp mechanism 49 at a position where delivery is possible, the delivery operation can be performed.

Next, the printing operation will be described. First,
The printing paper 53 is supplied between the plate cylinder 1 and the transfer cylinder 5 from the paper feeding means 15. The leading end of the supplied printing paper 53 is held by the plurality of claws 195 of the printing paper holding unit 151.
It is sandwiched and held between the blanket 173. Then, the printing paper 53 passes between the plate cylinder 1 and the transfer cylinder 5, and at this time, printing is performed on the front side of the printing paper 53 by the printing unit 17 from the plate cylinder 1 side. 5
The image once transferred from the plate cylinder 3 to the transfer cylinder 5 side is printed on the back side of 3. Then, the printing paper 53 on which printing has been performed is released from the holding of the printing paper holding means 151 at a predetermined timing, and is discharged via the paper discharging means 21.

Next, the cleaning operation by the cleaning means 22 will be described. First, when cleaning is not performed, the cleaning roller 205, the wiping roller 189, and the pressing roller 191.
Are both separated from the transfer cylinder 5. Also, at that time,
The sub-frame 181 is rotated so that the drive pin 213 on the cleaning roller frame 201 side comes to a position indicated by reference numeral 213 ′ in FIG. Next, when cleaning
A control signal (not shown) is input to the drive motor 217, and the drive motor 217 is activated. Thereby, the sub-frame 181 is rotated counterclockwise in FIG. 8 by a predetermined amount. By this rotation of the sub-frame 181, the wiping roller 189 and the pressing roller 191 do not contact the transfer cylinder 5, but only the cleaning roller 205 contacts the transfer cylinder 5 (first position). That is, the cam 215 of the sub-frame 181 drives the drive pin 213 (the drive pin 213 is located at the position indicated by reference numeral 213 ″ in FIG. 8), and the cleaning roller frame 201 is moved to the pin 20.
8 is rotated counterclockwise in FIG. As a result, the cleaning roller 205 is pressed against the transfer cylinder 5 and also pressed against the cleaning liquid supply roller 209, and as a result, the cleaning liquid supply roller 209 is transferred to the cleaning liquid supply roller 211.
Is pressed against. That is, the transfer cylinder 5, the cleaning roller 205,
The cleaning liquid supply roller 209 and the cleaning liquid supply roller 211 are all in contact with each other, and the cleaning roller 205 is rotationally driven by the rotating transfer cylinder 5. Then, the cleaning liquid 163 in the cleaning liquid tank 153 is applied to the outer peripheral surface of the transfer cylinder 5 via the cleaning liquid supply roller 211, the cleaning liquid supply roller 209, and the cleaning roller 205. By applying the cleaning liquid 163 to the transfer drum 5, the ink adhering to the outer peripheral surface of the transfer drum 5 is diluted and becomes soft, that is, in a state in which it is easily wiped off.

Next, after a certain time has elapsed, the drive motor 21
7, the sub-frame 181 is further rotated counterclockwise in FIG. 8, and the wiping roller 189 and the pressing roller 191 are lifted to a state of being pressed against the transfer cylinder 5 (second position). At that time, the cam 215 and the drive pin 2
13 (the drive pin 213 is located at the position shown by the solid line in FIG. 8), the cleaning roller frame 201 is released from the counterclockwise rotational drive in FIG. 8 and the urging force of the elastic member (not shown) is applied. On the contrary, the cleaning roller 205 is rotated by a predetermined amount in the clockwise direction, so that the cleaning roller 205 is separated from the transfer cylinder 5. Then, the wiping roller 189 is pressed against the transfer cylinder 5 and also pressed against the pinch roller 197 via the cleaning cloth 199. As a result, the rotation of the transfer cylinder 5 is also transmitted to the pinch roller 197 via the wiping roller 189, and thereby a pressing force for quantitatively feeding the cleaning cloth 199 is generated. Then, the ink wiped by the wiping roller 189 is transferred to the cleaning cloth 199 which is wound around the drive shaft 195 side. As a result, the transfer cylinder 5 is roughly wiped. Also, the pressing roller 191
Is pressed against the transfer cylinder 5 via a cleaning cloth 199,
As a result, the final wipe with the cleaning cloth 199 is performed. The ink wiped by the wiping roller 189 is to be transferred to the cleaning cloth 199 after the above-mentioned final wiping.

As described above, the cleaning roller 205 is provided with the cam follower 207, and the wiping roller 189 and the pressing roller 191 are also provided with the similar cam followers 225 and 227. on the other hand,
A cam 229 is installed at a predetermined position on the transfer cylinder 5 side. For example, when the recess 231 of the transfer cylinder 5 comes to the cleaning position, the cleaning is performed due to the relationship between the cam followers 207, 225, 227 and the cam 229. The roller 205, the wiping roller 189, and the pressing roller 191 are regulated so as not to enter the recess 231 on the transfer cylinder 5 side. This prevents excess cleaning liquid 163 from entering the transfer cylinder 5 side. After cleaning with the wiping roller 189 and the pressing roller 191 for a certain period of time,
When the cleaning roller 205 reaches the non-cleaning portion of the transfer cylinder 5, the rotation of the transfer cylinder 5 is stopped and the drive motor 217 is rotationally driven in the reverse direction. Thereby, the wiping roller 1
89, the pressing roller 191 is separated from the transfer cylinder 5,
The cleaning roller 205 is pressed against the transfer cylinder 5 again (the drive pin 213 is located at the position indicated by reference numeral 213 ″ in FIG. 8). This completes the first cleaning step, and repeats the same steps once again for cleaning. Leakage is prevented, and then the original position is restored, that is, the wiping roller 189, the pressing roller 191, and the cleaning roller 205 are all separated from the transfer cylinder 5 (the drive pin 213 is 21 in FIG. 8).
3 ').

Next, the cleaning means 21 as described above.
The timing of performing the cleaning by will be described. 9 and 10 are flowcharts showing the main program, in which a printing subroutine and a washing subroutine are included, and the printing subroutine and the washing subroutine are shown in FIGS. 11, 12 and 13, respectively. First, a description will be given along the main program shown in FIGS. 9 and 10. In step S21, the entire device is initialized by turning the power on again or by an initialization (so-called reset) device. Next, in step S22, the data in the nonvolatile memory is read. The data read here is data indicating the number of washings and whether the previous printing was single-sided printing or double-sided printing. Next, the data of the timer is read (step S23). This data is data indicating the elapsed time from the end of the previous printing.

Next, in step S24, it is determined whether or not 24 hours or more have passed since the previous printing.
If 24 hours or more have passed from the previous printing, the process proceeds to step S25 shown in FIG. 10 to perform cleaning. On the other hand, if 24 hours or more have not elapsed, the process proceeds to step S26, and it is determined whether the previous printing was single-sided. In the case of one side, the process proceeds to step S27 shown in FIG. If it is not one-sided, the process proceeds to step S28, and it is determined whether or not the number of times of cleaning is two or more.
If it is twice or more, the process proceeds to step S27. If it is not twice or more, the process proceeds to step S25 and cleaning is performed. That is, as a precondition for starting printing, it is determined whether or not a predetermined time (24 hours in the case of this embodiment) or more has elapsed from the previous printing, and if it has elapsed, cleaning is always performed. is there. Further, when the predetermined time has not elapsed, it is determined whether the previous printing was one side, and if it is one side, the cleaning is omitted. Also, if the previous printing was on both sides, the number of cleanings is a predetermined number (2 in the case of this embodiment).
It is determined whether or not the cleaning has been performed twice or more times, and the cleaning is performed only when the cleaning is not performed twice or more.

Next, in step S27, it is determined whether the single-sided printing start switch 241 is on or off. If it is on, the process proceeds to step S29 to read the number of printed sheets. Next, move to step S30,
It is determined whether or not the number of printed sheets is “0”, and if it is not “0”, the process proceeds to step S31 and the print mode is set to single-sided printing. Then, the process proceeds to step S32 to perform printing, and the process proceeds to step S33 to determine the print mode for the next print. On the other hand, if it is determined in step S27 that the one-sided printing is not performed, the process proceeds to step S34 and the two-sided printing start switch 24
On / off of 3 is determined. If it is turned on, the process proceeds to step S35, and the number of printed sheets is read as in the case of one side. Next, the process proceeds to step S36, it is determined whether or not the number of printed sheets is "0", and if not "0", the process proceeds to step S37 to set the print mode to double-sided printing. Then, the process proceeds to step S32 to print,
In step S33, the print mode for the next print is determined.

When the double-sided printing start switch 243 is off in step S34, the process proceeds to step S38, and it is determined whether the plate exchange switch 245 is on or off. If it is on, the process proceeds to step S39 to read the document, and then reverse the image (step S4
0), front plate cylinder discharge (step S41), plate making (step S42), and plate mounting on the front plate cylinder (step S43). Further, in step S38, the front plate exchange switch 2
If 45 is off, the process proceeds to step S44, and it is determined whether the backside plate exchange switch 247 is on or off. If it is on, the process proceeds to step S45, the original is read, and then the back plate cylinder is discharged (step S46), the plate is made (step S47), and the plate is placed on the back plate cylinder (step S4).
8) is executed.

Next, the cleaning in step S25 will be described with reference to FIGS. 11 and 12. First, step S
At 51, it is confirmed that the cleaning liquid is insufficient. If the cleaning liquid is insufficient, the cleaning liquid run-out lamp 249 is turned on (step S52). If the cleaning liquid is not insufficient, the process proceeds to step S53, and the cleaning liquid out lamp 249 is turned off. Next, the process proceeds to step S54, and it is determined that the cleaning cloth has run out. If the cleaning cloth is out, the cloth out lamp 251 is turned on (step S).
55). On the other hand, if the cleaning cloth is not exhausted,
In step S56, the cloth cut lamp 251 is turned off. Next, the process moves to step S57, the buzzer 253 sounds and the LED 255 blinks.
Next, in step S58, the number of cleanings is initialized, and then the transfer cylinder 5 starts rotating (step S5).
9). Then, the measurement of the rotation amount is started (step S6
0), the cleaning position is brought to the first position (step S61).

Next, shifting to FIG. 12, step S62.
Check that the cleaning liquid is insufficient. If the cleaning liquid is not insufficient, the transfer cylinder 5 is rotated twice (step S63), the measurement of the rotation amount is started (step S64), and the cleaning unit is brought to the second position (step S65). Next, the routine proceeds to step S66, where it is determined that the cleaning cloth has run out. If the cleaning cloth has not run out, it is determined whether or not the transfer cylinder 5 has rotated twice (step S67). Adds the number of times of cleaning in the nonvolatile memory by one (step S
68). Next, the process proceeds to step S69, and it is determined whether or not the number of times of cleaning is two. If it is two, the process proceeds to step S70 to return the cleaning unit to the standby position. Then, the buzzer 253 and the LED 255 are stopped (step S7).
1).

On the other hand, in step S62,
If the cleaning liquid is insufficient, the process proceeds to step S72 and the cleaning unit is returned to the standby position. Then, step S73
Then, the rotation of the transfer cylinder 5 is stopped, and step S
Return to 51. If the number of times of cleaning has not reached 2 in step S69, the process returns to step S60.

Next, printing will be described with reference to FIG. First, in step S74, the print mode is determined. In the case of double-sided printing, step S75
Then, the number of washings is set to "0". And
Double-sided printing of the set number is performed (step S76). The number of prints is set by the print number setting switch 257. Then, in step S77, the clock timer is set to "0" and the process ends. If it is determined in step S74 that the one-sided printing is performed, the process proceeds to step S78, and the set number of one-sided printing is performed.

According to this embodiment, the following effects can be obtained. First, by providing the cleaning unit 22 for cleaning the transfer drum 5 and the control unit for selectively executing the cleaning unit 22, it is possible to clean the transfer drum 5 at a desired timing.
In the stencil printing machine equipped with the transfer cylinder 5, it is possible to improve the printing quality. Further, since the cleaning unit 22 is configured to selectively perform the cleaning immediately after the initialization of the entire apparatus, it is possible to reliably improve the print quality. In particular, if there is a long time after the end of printing until the next printing, and even if dust adheres to the transfer cylinder 5 during that time, the cleaning is always performed before the next printing. The print quality does not deteriorate due to such dust adhesion. or,
When printing is performed after the initialization of the entire device, it is determined whether or not the number of times of cleaning indicating the completion state of cleaning has been performed a predetermined number of times, and be sure to perform printing after the predetermined number of times. Therefore, the above effect can be further enhanced. Also, if the predetermined time has not elapsed from the previous printing after the initialization of the entire apparatus and the previous printing was single-sided printing without using the transfer cylinder, the cleaning should be omitted. Therefore, unnecessary cleaning can be omitted and the operating rate of the device can be increased. If the printing is once completed and the printing is double-sided printing using the transfer cylinder, washing is performed, and if the single-sided printing is not using the transfer cylinder,
By omitting unnecessary cleaning, the time required for printing can be shortened.

Next, a second embodiment of the present invention will be described with reference to FIG. That is, in the first embodiment, the case where the transfer cylinder 5 is used only for printing on the back side of the printing paper 53 has been described as an example, but as shown in FIG. The two transfer cylinders 5 and 5 may be installed so that the printing on the front surface side of the printing paper 53 may be performed via the transfer cylinder 5. In this case, in that the number of transfer cylinders 5 increases,
Although the size of the apparatus is increased, if the cleaning unit and the control unit of each transfer cylinder are similarly controlled, the printing paper 5
3 has a great effect in eliminating variations in printing quality on the front surface side and the back surface side and improving the operating rate.

The present invention is not limited to the first and second embodiments. First, the configuration of the stencil printing machine itself is not limited to that of the first and second embodiments, and the point is that in a device including a transfer cylinder, cleaning means is provided and the cleaning means is selectively used. It may be configured to execute. Further, in the case of each of the above-described embodiments, the stencil printing device that performs double-sided printing has been described as an example, but only one-sided printing is performed, and the same applies to a stencil printing device that includes a transfer cylinder. , Applicable. Various configurations of the cleaning unit itself are possible. Further, the setting relating to the elapsed time from the previous printing and the setting of the number of times of cleaning indicating the completion of cleaning may be arbitrarily set.

[0047]

As described above in detail, according to the stencil printing apparatus of the present invention, the stencil printing machine having the transfer cylinder is provided with the cleaning means for cleaning the outer peripheral surface of the transfer cylinder, and the cleaning means is selectively executed. With this configuration, it is possible to reliably improve the print quality.
Further, at this time, various kinds of information at the time of the previous printing are recorded in the recording means, and based on the information, the control means determines whether or not the cleaning by the cleaning means is necessary. Therefore, it is possible to perform only the necessary cleaning, thereby improving the original operating rate of the apparatus and preventing the time required for printing from being prolonged.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a first embodiment of the present invention, and is a perspective view illustrating an appearance of a stencil printing apparatus.

FIG. 2 is a diagram illustrating the first embodiment of the present invention, and is a side view schematically illustrating an internal configuration of the stencil printing apparatus.

FIG. 3 is a view showing the first embodiment of the present invention, and is a side view showing an outline of an internal configuration of a stencil printing apparatus and a configuration of a rotation transmission mechanism for rotating a plate cylinder and a transfer cylinder.

FIG. 4 is a view showing the first embodiment of the present invention, and is a side view mainly showing the configuration of the printing means at the time of printing, of the inside of the plate cylinder.

FIG. 5 is a view showing the first embodiment of the present invention, and is a cross-sectional view showing a configuration inside the plate cylinder and mainly showing a printing unit.

FIG. 6 is a view showing the first embodiment of the present invention, and is a side view showing the configuration inside the plate cylinder with a focus on the configuration of a printing unit at the time of printing.

FIG. 7 is a view showing the first embodiment of the present invention, and is a side view showing a rotation operation of a lift cam of a printing unit.

FIG. 8 is a diagram showing a first embodiment of the present invention and is a diagram showing a configuration of a cleaning unit.

FIG. 9 is a diagram showing the first embodiment of the present invention and is a flowchart showing the contents of a main program.

FIG. 10 is a diagram showing the first embodiment of the present invention and is a flowchart showing the contents of a main program.

FIG. 11 is a diagram showing the first embodiment of the present invention and is a flowchart showing the contents of a cleaning subroutine.

FIG. 12 is a diagram showing the first embodiment of the present invention and is a flowchart showing the contents of a cleaning subroutine.

FIG. 13 is a diagram showing the first embodiment of the present invention and is a flowchart showing the contents of a print subroutine.

FIG. 14 is a view showing a second embodiment of the present invention and is a side view schematically showing only a main part of a stencil printing machine when two transfer cylinders are provided.

FIG. 15 is a side view schematically showing a main part of a stencil printing machine, showing a conventional example.

[Explanation of symbols]

 1 plate cylinder 3 plate cylinder 5 transfer cylinder 22 cleaning means

Claims (5)

[Claims] 1. A stencil printing apparatus comprising: a plate cylinder around which a plate-making base paper is wound; and a transfer cylinder to which a print image is transferred from the plate cylinder. A cleaning means for cleaning the surface, an information recording means for recording various information at the time of printing performed before, and a judgment as to whether cleaning by the cleaning means is necessary or not based on the information recorded in the information recording means. And a control means for selectively performing cleaning by the cleaning means. 2. The stencil printing apparatus according to claim 1,
The information recording means is nonvolatile and records the elapsed time from the previous printing, and the control means is based on the elapsed time recorded by the information recording means when the entire apparatus is initialized. A stencil printing machine, characterized in that it is determined whether or not a predetermined time set in advance has elapsed, and if the predetermined time has elapsed, cleaning is performed by the cleaning means. 3. The stencil printing apparatus according to claim 2,
The information recording means is non-volatile and records whether the previously performed printing is single-sided printing without the transfer cylinder or double-sided printing with the transfer cylinder, and the control means initializes the entire apparatus. At this time, when it is determined that a predetermined time has not elapsed since the previous printing, and when it is determined that the printing is single-sided printing, the stencil printing apparatus is not allowed to perform cleaning by the cleaning unit. 4. The stencil printing machine according to claim 3, wherein
The information recording means is non-volatile and records the number of times of cleaning,
The control unit determines that the predetermined time has not elapsed from the previous printing when the entire apparatus is initialized, determines that the printing is double-sided, and determines that the cleaning has been performed a predetermined number of times. The stencil printing machine is characterized in that it is not washed by the above-mentioned cleaning means when the stencil printing is performed. 5. The stencil printing machine according to claim 1, wherein
The information recording means is non-volatile, and records whether the previously performed printing is single-sided printing without using the transfer cylinder or double-sided printing with the transfer cylinder, and the control means after the printing is finished once, If it is determined to be single-sided printing or double-sided printing, and if it is determined to be single-sided printing, the cleaning by the cleaning unit is not performed, and if it is determined to be double-sided printing, the cleaning by the cleaning unit is performed. A stencil printing machine characterized by being performed.