JP2009061604A - Safety device of printing machine and rotary printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the lowering of printing quality and the increase of cost and, at the same time, to improve safety in the safety device of a printing machine and a rotary printing machine. <P>SOLUTION: In the newspaper offset rotary printing machine, which keeps a blanket cylinder 21 and a plate cylinder 23 rotatably supported to a frame 62, a blanket 92 installed on the blanket cylinder 21 and a press plate 63 installed on the plate cylinder 23, a second working notched part 25 is formed at the axial end of the blanket cylinder 21 and, at the same time, a first working notched part 27 is formed at the axial end of the plate cylinder 23 under the condition that a second safety cover 29 is provided so as to cover the second working notched part 25 and a first safety cover 31 is provided so as to cover the first working notched part 27. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention covers a predetermined portion of a plate cylinder or a blanket cylinder with a printing machine that transfers ink supplied from a printing apparatus to a blanket cylinder to a printing sheet supplied from a paper feeder. And a rotary printing press to which the safety device of the printing press is applied.

  A general web offset press for newspaper includes a plurality of paper feeding devices, a plurality of printing units, a turn bar device, and a folding machine, and a web is supplied from each paper feeding device to the printing unit. After each web is printed, and the web travel route is changed by the turn bar device, the web is overlapped in a predetermined order, and then the web is vertically folded by a folding machine for a predetermined length. The paper is then cut horizontally and folded to form a folded book, which is discharged.

  In such a newspaper offset rotary printing press, the plate cylinder and the blanket cylinder constituting the printing unit need to be maintained during the printing operation. For example, in the case of a plate cylinder, it is necessary to replace the printing plate every time the printed matter is changed. In the case of a blanket cylinder, if the blanket deteriorates due to long-term use, the blanket needs to be replaced.

  For example, a plate clamping device used for exchanging a printing plate with respect to a plate cylinder winds this printing plate around the outer peripheral surface of the plate cylinder and fixes each end in the winding direction to the plate cylinder. For example, it is described in the following Patent Document 1. The plate clamping device of the printing machine described in the following Patent Document 1 forms a cylinder groove on the surface of the plate cylinder in the axial direction into which the holding side end and the holding end side end of the printing plate are inserted. A tension bar is rotatably arranged in the groove, and a plate presser claw having a contact surface that comes into contact with the bent surface of the end on the bottom side is provided on the tension bar, and a lever is attached to the end of the tension bar. , The plate holding claw is hooked on the bent part at the end of the bottom edge by the spring mechanism and urged in the direction of pulling it into the body groove, while the handle is attached to the lever, and the release holding the plate holding claw off the end on the bottom side It can be rotated in the direction.

  By the way, the plate cylinder of the printing machine described above is provided with a work notch for exchanging the printing plate by a plate clamping device at its end, considering the safety of the operator during the printing operation, A safety cover is provided. In this case, conventionally, a printing unit including a plate cylinder or a blanket cylinder is accommodated in a predetermined housing, a maintenance opening is formed in the housing, and a safety cover for opening and closing the opening is provided. Accordingly, the operator opens the safety cover and enters the housing, performs plate replacement work and blanket replacement work, and closes the safety cover during printing work. At the time of this plate exchange work or blanket exchange work, the operator pushes the operation switch to rotate the plate cylinder or the blanket cylinder to change the plate or the blanket, and release the operation switch to remove the plate cylinder or the blanket exchange. By stopping the rotation of the blanket cylinder, the safety of the operator is ensured. Further, when the safety cover is opened during the printing operation, the printing operation is stopped, that is, the rotation of each cylinder is stopped, thereby ensuring the safety of the operator.

  Moreover, there exists a thing described in the following patent document 2 as a safety device of a printing press. The safety device in the rotary printing press described in the following Patent Document 2 is provided with pins on both ends that are slidably mounted by a spring member in the vicinity of the rotary bite portion of the plate cylinder and the rubber cylinder. The safety bar is supported by a bearer cover and is detachably mounted. When the safety bar is removed, a switch is operated by a pin so that the plate cylinder and the rubber cylinder can only be rotated.

JP 2003-205597 A Japanese Utility Model Publication No. 63-019150

  The above-described safety cover accommodates a printing unit such as a plate cylinder or a blanket cylinder in a space closed by a housing. Therefore, when water is sprayed on the surface of the plate cylinder or the blanket cylinder by the dampening device during the printing operation, the humidity in the housing rises and condensation occurs. Then, water droplets generated by this condensation may fall on the surface of the plate cylinder or the blanket cylinder, resulting in a printing failure. In this case, it is conceivable to provide a ventilation device, a dehumidifying device, or the like in the housing, but the manufacturing cost increases and the operation cost increases.

  On the other hand, with the safety device of the conventional printing press, when the safety cover is opened, the rotation of the plate cylinder and the rubber cylinder is only inching, so the safety is improved, but the work in plate replacement work and blanket replacement work is improved. As a result, the manufacturing cost also increases. In addition, although this bearer cover is provided in this patent document 2, this bearer cover prevents dirt by covering the outer peripheral side of a bearer, and does not ensure the safety | security of an operator.

  SUMMARY An advantage of some aspects of the invention is that it provides a printing press safety device and a rotary printing press that suppress a decrease in printing quality and an increase in cost and improve safety.

  In order to achieve the above object, the safety device for a printing press according to the first aspect of the present invention is such that a printing cylinder is rotatably supported with respect to a frame, and a printing plate for delivering ink is mounted on the outer periphery of the printing cylinder. In the printed printing press, a working notch for exchanging the printing plate is provided at an axial end of the printing cylinder, and a safety cover capable of covering the working notch is provided on the frame side. It is characterized by that.

  In the safety device for a printing press according to a second aspect of the present invention, the work notch has a predetermined width in the axial direction of the printing cylinder and is provided along the circumferential direction, and the safety cover includes the work It is characterized in that it has a width larger than the width of the cut-out portion and covers at least a part of the cut-out portion for work.

  In the safety device for a printing press according to the invention of claim 3, the printing cylinder has a cylinder body on which the printing plate is mounted, and a bearer having a ring shape provided at an axial end of the cylinder body, The work notch is provided between the trunk body and the bearer.

  In the safety device for a printing press according to the invention of claim 4, a groove portion for inserting an end portion in the winding direction of the printing plate is provided along an axial direction on an outer peripheral portion of the printing cylinder, and the printing plate is disposed in the groove portion. A first locking portion for locking one end portion in the winding direction of the printing plate and a second locking portion for locking the other end portion in the winding direction of the printing plate are provided. A plate fastening device capable of operating at least one of the first locking portion and the second locking portion is provided.

  In the safety device for a printing press according to a fifth aspect of the present invention, an opening is provided in the safety cover so as to face the plate fastening device, and the first locking portion or the second through the opening on the frame side. An operating member that operates the locking portion is provided movably.

  The safety device for a printing press according to a sixth aspect of the present invention is characterized in that the safety cover is provided with an elastic member on the printing cylinder side.

  In the safety device for a printing press according to a seventh aspect of the present invention, the safety cover is movably supported between a covering position for covering the work cutout portion and a retracted position for exposing the work cutout portion. It is a feature.

  A rotary printing press according to an eighth aspect of the present invention includes a paper feeding device that supplies a web from a web, a printing unit that performs printing on the web fed from the paper feeding device, and a plurality of prints that are printed by the printing unit. In a rotary printing press provided with a folding machine that forms a folding book by cutting and folding a web, the printing unit is rotatably supported by a frame and is in contact with two printed blankets In a rotary printing press comprising: a cylinder; a plate cylinder rotatably supported by the frame and in contact with each blanket cylinder; and an ink supply device for supplying ink to each plate cylinder. A first work notch for replacing the printing plate is provided at the end in the direction, and a first safety cover capable of covering the first work notch is provided on the frame side. And it is characterized in Rukoto.

  In the rotary printing press according to the ninth aspect of the present invention, a groove for inserting and locking one end in the winding direction of the printing plate is provided along the axial direction on the outer periphery of the plate cylinder, and the groove is provided in the groove. A locking claw for locking the other end in the winding direction of the printing plate is provided, a plate clamping device capable of operating the locking claw is provided in the first work notch, and the first safety cover has the While an opening is provided to face the plate clamping device, an operating member that operates the locking claw through the opening is provided movably on the frame side.

  In the rotary printing press according to the invention of claim 10, a second work notch for exchanging a blanket is provided at an axial end of the blanket cylinder, and the second work notch is provided on the frame side. A coverable second safety cover is provided.

  In the rotary printing press according to the invention of claim 11, a groove portion for inserting an end portion in the winding direction of the blanket is provided along the axial direction in the outer peripheral portion of the blanket cylinder, and the winding direction of the blanket is provided in the groove portion. A locking member that locks the one end and the other end is provided, a blanket fastening device that can operate each locking member is provided in the second work cutout, and the second safety cover includes The second working notch is covered in a covering position and a retreating position exposing the second working notch is movably supported.

  In the rotary printing press according to the invention of claim 12, the plate cylinder and the blanket cylinder have a cylinder body and a ring-shaped bearer, and the first work notch and the second work notch are It is provided between the trunk body and the bearer.

  According to the safety device for a printing press of the invention of claim 1, the printing cylinder is rotatably supported with respect to the frame, and a printing plate for delivering ink is mounted on the outer periphery of the printing cylinder. A work cutout for exchanging the printing plate is provided at the end in the axial direction, and a safety cover capable of covering the work cutout is provided on the frame side. Therefore, the work notch is covered with the safety cover, so that the safety for the operator can be improved, while it is not necessary to cover the entire printing unit and the deterioration of the printing quality can be suppressed. , Increase in cost can be suppressed.

  According to the safety device of the printing press of the invention of claim 2, the work notch is provided along the circumferential direction with a predetermined width in the axial direction of the printing cylinder, and the safety cover is larger than the width of the work notch. Since it has a large width and covers at least a part of the work notch, it is possible to appropriately avoid the operator's hand from being caught in the work notch.

  According to the safety device for a printing press of the invention of claim 3, as a printing cylinder, a cylinder body on which a printing plate is mounted, and a ring-shaped bearer provided at an axial end of the cylinder body are provided, and a work notch is provided. Since the portion is provided between the trunk body and the bearer, it is possible to ensure high workability in the replacement work of the printing plate, and it is possible to appropriately cover the cutout portion for work with the safety cover.

  According to the safety device for a printing press of the invention of claim 4, the groove portion for inserting the end portion in the winding direction of the printing plate is provided along the axial direction in the outer peripheral portion of the printing cylinder, and one end portion of the printing plate is provided in the groove portion. And a second locking portion for locking the other end portion, and at least one of the first locking portion and the second locking portion is locked to the work notch portion. Since the plate fastening device that can operate the part is provided, the plate fastening device provided in the work notch is covered with the safety cover, so that the operator's hand does not touch the plate fastening device during the printing operation. , Safety can be further improved.

  According to the safety device of the printing press of the invention of claim 5, the safety cover is provided with the opening portion facing the plate fastening device, and the first locking portion or the second locking portion is operated through the opening portion on the frame side. Since the operating member to be moved is provided movably, the safety of the operator can be improved by the safety cover, and the plate fastening device is operated by the operating member to automatically change the printing plate. Can be improved.

  According to the safety device of the printing press of the invention of claim 6, since the elastic member is mounted on the printing cylinder side of the safety cover, even if the printing cylinder contacts the safety cover, the surface of the printing plate is not damaged. In addition, damage to the printing cylinder can be prevented.

  According to the safety device for a printing press of the invention of claim 7, since the safety cover is movably supported between the covering position for covering the work notch and the retracted position for exposing the work notch, In some cases, the safety cover can be moved to the covering position to improve the safety of the operator. On the other hand, when the printing plate is replaced, the safety cover is moved to the retracted position so that the printing plate can be replaced. Workability can be improved.

  According to the rotary printing press of the invention of claim 8, it is composed of a paper feeding device, a printing unit, and a folding machine, the printing unit is composed of a blanket, a plate cylinder, and an ink supply device, and the axial direction of the plate cylinder is A first work notch for replacing the printing plate is provided at the end, and a first safety cover capable of covering the first work notch is provided on the frame side. Therefore, the first safety cover covers the first work cutout, so that the safety for the operator can be improved. On the other hand, it is not necessary to cover the entire printing unit and the deterioration of the print quality is suppressed. And increase in cost can be suppressed.

  According to the rotary printing press of the invention of claim 9, a groove portion is provided along the axial direction in the outer peripheral portion of the plate cylinder to insert and lock one end portion in the winding direction of the printing plate, and the printing plate is placed in the groove portion. A locking claw for locking the other end in the winding direction is provided, a plate clamping device capable of operating the locking claw is provided in the first work notch, and an opening portion is provided in the first safety cover so as to face the plate clamping device. On the other hand, the operating member that operates the locking claw through the opening on the frame side is movably provided, so that the first safety cover covers the plate clamping device provided in the first work notch, and printing The operator does not touch the plate clamping device during the operation, and safety can be further improved, and the plate clamping device is operated by the operating member and the plate is replaced automatically. Thus, workability can be improved.

  According to the rotary printing press of the invention of claim 10, the second work notch for replacing the blanket is provided at the axial end of the blanket cylinder, and the second work notch can be covered on the frame side. Since the second safety cover is provided, the second safety cover covers the second work notch, so that safety for the operator can be improved, but it is not necessary to cover the entire printing unit. A decrease in print quality can be suppressed, and an increase in cost can be suppressed.

  According to the rotary printing press of the eleventh aspect of the present invention, the outer peripheral portion of the blanket cylinder is provided with the groove portion for inserting the end portion in the blanket winding direction, and the one end portion and the other end portion of the blanket are locked in the groove portion. A locking member is provided, a blanket fastening device capable of operating each locking member is provided in the second work notch, a second safety cover is covered with a covering position that covers the second work notch, and the second work Since the cutout portion is movably supported to the retracted position where it is exposed, the blanket provided in the second work cutout portion by the second safety cover is moved by moving the second safety cover to the covering position during the printing operation. The fastening device will be covered, and the operator's hand will not touch the blanket fastening device during the printing operation, and safety can be further improved. And moving the second safety cover to the retracted position, it is possible to improve the workability of the replacement of the blanket.

  According to the rotary printing press of the invention of claim 12, the plate cylinder and the blanket cylinder are provided with a bearer having a ring shape with the cylinder main body, and the first work notch and the second work notch are formed of the cylinder main body and the bearer. Therefore, it is possible to ensure high workability in the replacement work of the printing plate and the blanket, and to properly cover the work notch with the safety cover.

  Exemplary embodiments of a safety device for a printing press and a rotary printing press according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example.

  FIG. 1 is a schematic view of a printing unit to which a printing press safety device according to an embodiment of the present invention is applied. FIG. 2 is a cross-sectional view showing a safety cover in the printing press safety device of this embodiment. FIG. 4 is a sectional view showing a plate clamping device in the safety device of the printing press according to the present embodiment, FIG. 4 is a plan view showing the safety device of the printing press according to the present embodiment, and FIG. 5 is a safety view of the printing press according to the present embodiment. It is the schematic showing the web offset press for newspapers to which the device was applied.

  As shown in FIG. 5, the printing press of this embodiment is a newspaper offset rotary printing press, and includes a plurality (seven in this embodiment) of paper feeders 11 and a plurality (7 in this embodiment). Printing units 12 and 13, a turn bar device 14, and a folding machine 15. In the newspaper offset rotary printing press of this embodiment, the paper feeder 11 is installed on the first floor of a building (not shown), the printing units 12 and 13 are installed on the second and third floors, and the third to fifth floors. A turn bar device 14 is installed, and a folding machine 15 is installed on the second and third floors.

  Each of the paper feeding devices 11 described above is provided with a holding arm 16 that holds three webs R each having a web W wound in a roll shape, and the webs R are fed by rotating the holding arms 16. Can be rotated to a position. Each paper feeding device 11 is provided with a paper splicing device (not shown), and when the web R fed out at the paper feeding position becomes small, the paper splicing device causes the paper web R at the paper feeding position to be removed. Thus, the web R in the standby position can be spliced.

  In the printing units 12 and 13, the printing unit 12 is a multi-color printing unit that performs four-sided four-color printing, and the printing unit 13 is a two-color printing unit that performs two-sided two-color printing. The printing units 12 and 13 are provided with an ink supply device (not shown). Accordingly, when the web W is supplied from the paper feeding device 11 to the printing units 12 and 13, each printing unit 12 and 13 can perform predetermined printing on each web W. In this embodiment, the printing units 12 and 13 are constituted by the multi-color printing unit 12 and the two-color printing unit 13, but the present invention is not limited to this configuration. For example, various units may be used in combination as appropriate according to the printed matter, such as a double-sided single-color printing unit that performs single-sided printing on both sides and a multicolor printing unit that performs four-color or two-color printing on one side.

  Although not shown, the turn bar device 14 includes a plurality of cutters that cut the web W along the length (longitudinal direction of the web W or the conveyance direction of the web W) at the center in the width direction, and conveyance of the longitudinally cut web W. A number of turn bars are provided to set the route. Accordingly, the webs W printed by the printing units 12 and 13 are vertically cut by the cutter in the turn bar device 14, and the conveyance path is changed by the turn bar so that they can be overlapped in a predetermined order. .

  The folding machine 15 is provided with a former, a folding cylinder and a saw cylinder are provided facing each other, a pair of folding rollers is provided below the former, and an impeller and a paper discharge conveyor are further provided below the former. . Accordingly, when a plurality of webs W are overlapped and introduced from the turn bar device 14, the web W is vertically folded by the former in the folding machine 15, and is horizontally cut to a predetermined length by the folding cylinder and the saw cylinder, and folded. The desired folding book can be formed by folding it horizontally with a roller, and this folding book can be ejected by an impeller and a delivery conveyor.

  The newspaper rotary offset printing press of this embodiment configured as described above is provided with a safety device for a plate cylinder and a blanket cylinder. That is, a printing plate is exchangeably attached to the plate cylinder in the printing units 12 and 13, and a blanket (rubber) is exchangeably attached to the blanket cylinder. Is provided with a work cutout for exchanging the printing plate and the blanket, and a safety cover capable of covering the work cutout is provided. The printing cylinder of the present invention is a plate cylinder and a blanket cylinder, and the printing plate of the present invention is a printing plate and a blanket.

  Hereinafter, the safety device of the printing press according to the present embodiment will be described in detail. The same safety device is applied to the printing units 12 and 13 described above, and the safety device is applied to the printing unit 12. Only explained.

  In the printing apparatus safety device according to the present embodiment, as shown in FIG. 1, the printing unit 12 includes a pair of blanket cylinders 21 and 22 that are arranged below and face each other across the web W, and the blanket cylinders 21 and 22. And a pair of blanket cylinders 41 and 42 which are disposed above and face each other across the web W, and plate cylinders 43 and 44 which are in contact with the blanket cylinders 41 and 42, respectively. And have. Each blanket cylinder 21, 22, 41, 42 is formed with second working cutouts 25, 26, 45, 46 at the end in the axial direction, and each plate cylinder 23, 24, 43, 44 has First work cutout portions 27, 28, 47, and 48 are formed at end portions in the axial direction. On the frame side, which will be described later, second safety covers 29, 30, 49, 50 that cover the second work notches 25, 26, 45, 46 of the blanket cylinders 21, 22, 41, 42 are arranged. In addition, first safety covers 31, 32, 51, 52 that cover the first work notches 27, 28, 47, 48 of the plate cylinders 23, 24, 43, 44 are arranged.

  Here, since the first safety cover 31, 32, 51, 52 and the second safety cover 29, 30, 49, 50 have substantially the same configuration, the second safety cover 29 and the plate cylinder of the blanket cylinder 21 are configured. Only the first safety cover 31 will be described.

  As shown in FIGS. 2 to 4, the plate cylinder 23 has a rotating shaft 61 rotatably supported by a frame 62 via a bearing and is rotatable by a driving device (not shown). The plate cylinder 23 includes a cylinder main body 64 around which the printing plate 63 is wound, and a bearer 65 having a ring shape provided at both end portions in the axial direction of the cylinder main body 64 (only one end portion in the drawing). A first work cutout 27 is provided between the trunk body 64 and the bearer 65.

  Further, a groove portion 66 is formed in the outer peripheral portion of the cylinder body 64 of the plate cylinder 23 along the axial direction, and both end portions of the groove portion 66 communicate with the first work cutout portion 27. A tension bar 67 is rotatably supported in the groove 66. A rotation shaft 68 is fitted in the tension bar 67, and the tension bar 67 and the rotation shaft 68 are connected to be integrally rotatable. The rotation shaft 68 has an end extending to the first work cutout 27. The groove portion 66 of the plate cylinder 23 is formed with a locking groove (first locking portion) 66a for locking a locking portion 63a formed by bending at one end portion in the winding direction of the printing plate 63. On the outer peripheral portion of the tension bar 67, there is formed a locking claw (second locking portion) 67a that is locked by a locking portion 63b formed by bending at the other end portion in the winding direction of the printing plate 63. .

  A locking lever 69 constituting a plate clamping device is fitted to the end of the tension bar 67 located at the first work cutout 27 and is coupled so as to be integrally rotatable. The locking lever 69 has an operating arm 69a on one radial side and a mounting arm 69b on the other radial side. A compression coil spring 71 is interposed between the mounting base 70 fixed to the first work cutout 27 and the operating arm 69a of the locking lever 69. The locking lever 69 is shown in FIG. The locking claw 67a of the tension bar 67 is biased and supported in the counterclockwise direction, that is, in the direction of restraining the locking portion 63b of the printing plate 63. A manual handle 72 is connected to the mounting arm 69b of the locking lever 69, and an operating handle 74 is rotatable on the mounting base 73 fixed to the first work cutout 27. It is attached to.

  On the other hand, a mounting bracket 75 extending to the first work notch 27 of the plate cylinder 23 is fixed to the frame 62, and an air cylinder 76 is attached to the mounting bracket 75. In addition, a moving body 78 is movably supported on the mounting bracket 75 via a linear guide 77, and the moving body 78 can be moved by an air cylinder 76. An operating roller 79 is attached to the moving body 78, and the operating roller 79 can be moved toward and away from the operating arm 69 a of the locking lever 69 by the air cylinder 76 via the moving body 78. .

  Therefore, in the state where the printing plate 63 is wound around the outer peripheral portion of the plate cylinder 23, the locking portion 63a at one end in the winding direction is locked to the locking groove 66a, and the locking portion 63b at the other end. Is locked to the locking claw 67a, and the locking lever 69 is biased by the biasing force of the compression coil spring 71, whereby the locking claw 67a of the tension bar 67 restrains the locking portion 63b of the printing plate 63. The plate 63 can be properly mounted on the outer periphery of the plate cylinder 23. On the other hand, when air is supplied to or discharged from the air cylinder 76 from this state and the operating roller 79 is brought close to the locking lever 79 via the moving body 78, the operating roller 79 presses the operating arm 69a, and the compression coil spring 71 is pressed. 3 to release the restraint of the latching portion 63b of the printing plate 63 by the latching claw 67a of the tension bar 67 by rotating the latching lever 69 clockwise in FIG. The printing plate 63 can be removed from the outer periphery of the plate cylinder 23.

  The first work cutout 27 described above has a predetermined width in the axial direction of the plate cylinder 23 and is provided along the circumferential direction. The first safety cover 31 is formed of the first work cutout 27. It has a larger width than the width of 27, has a rectangular shape curved along the circumferential direction of the plate cylinder 23, and covers at least a part of the first work cutout 27. That is, the base end portion of the mounting bracket 81 is fixed to the frame 62, and the base end portion of the mounting bracket 83 is fixed via the support bracket 82, and is fastened to the front end portions of the mounting brackets 81 and 83. The first safety cover 31 is fixed by bolts 84 and 85.

  The first safety cover 31 is provided with a rubber plate 86 as an elastic member on the back surface, that is, the surface of the plate cylinder 23 facing the surface of the printing plate 63. Further, the first safety cover 31 has an opening 87 at a position facing the locking lever 69, and the operation roller 79 engages with the locking lever 69 through the opening 87, thereby operating arm 69 a. The locking lever 69 can be rotated by pressing.

  On the other hand, as shown in FIGS. 2 to 4, the blanket cylinder 21 has a rotating shaft 91 rotatably supported by a frame 62 via a bearing and is rotatable by a driving device (not shown). The blanket cylinder 21 has a trunk body 93 around which the blanket 92 is wound, and a bearer 94 having a ring shape provided at both end portions (only one end portion in the drawing) of the trunk body 93 in the axial direction. A second work cutout 25 is provided between the trunk body 93 and the bearer 94.

  A groove portion 95 is formed along the axial direction on the outer peripheral portion of the body main body 93 of the blanket cylinder 21, and both end portions of the groove portion 95 communicate with the first work cutout portion 27. In this groove portion 95, the holding side winding shaft 96 and the holding bottom side winding shaft 97 are arranged in parallel, and the ends of the winding shafts 96, 97 extend to the second work cutout portion 25. Has been. The holding side winding shaft 96 is provided with a presser foot (first locking portion) (not shown) that locks one end portion of the blanket 92 in the winding direction, and the holding end side winding shaft 97 is wound in the winding direction of the blanket 92. A presser foot (second locking portion) (not shown) that locks the other end of the belt is provided. A blanket fastening device (not shown) is provided at the end of each of the winding shafts 96 and 97 located in the second work cutout portion 25, and this blanket fastening device can be operated by an operator. .

  The second work cutout 25 has a predetermined width in the axial direction of the blanket cylinder 21 and is provided along the circumferential direction. The second safety cover 29 is provided with the second work cutout 25. And a rectangular shape that is curved along the circumferential direction of the blanket cylinder 21 and covers at least a part of the second work cutout 25. That is, the base end portion of the mounting bracket 99 is fixed to the frame 62 via the support bracket 82, and the base end portion of the mounting bracket 100 is fixed, and is fastened to the distal end portions of the mounting brackets 99 and 100. The second safety cover 29 is fixed by bolts 101 and 102. The second safety cover 29 has a rubber plate 103 as an elastic member attached to the back surface, that is, the surface of the blanket cylinder 21 that faces the surface of the blanket 92.

  And this 2nd safety cover 29 loosens the fastening bolt 102, makes an edge part an unrestrained state, and rotates manually, thereby covering the second work cutout 25 (solid line in FIG. 2). Position) and a retracted position (a two-dot chain line position in FIG. 2) that exposes the second work cutout 25.

  Here, only the second safety cover 29 on one axial side of the blanket cylinder 21 and the first safety cover 31 on one axial side of the plate cylinder 23 have been described, but the second safety cover 31 on the other axial side of the blanket cylinder 21 has been described. 2 The safety cover and the first safety cover on the other side in the axial direction of the plate cylinder 23 have substantially the same configuration. Although only the second safety cover 29 of the blanket cylinder 21 and the first safety cover 31 of the plate cylinder 23 have been described, the second safety covers 30, 49, 50 and the plate cylinder 24 of the other blanket cylinders 22, 41, 42 are described. , 43, 44 have substantially the same configuration as the first safety covers 32, 51, 52.

  As described above, in the safety device of the printing press according to the present embodiment, the blanket cylinder 21 and the plate cylinder 23 are rotatably supported with respect to the frame 62, and the blanket 92 is attached to the blanket cylinder 21. In the newspaper offset rotary printing press equipped with the printing plate 63, the second work notch 25 is formed at the axial end of the blanket cylinder 21 and the first at the axial end of the plate cylinder 23. A work safety notch 27 is formed, a second safety cover 29 covering the second work notch 25 is provided, and a first safety cover 31 covering the first work notch 27 is provided.

  Accordingly, the work cutouts 25 and 27 are covered with the safety covers 29 and 31, so that the operator's hand and the like are not caught between the work cutouts 25 and 27 during the printing operation, and the work safety is ensured. However, it is not necessary to cover the entire printing unit, and it is possible to suppress a decrease in print quality and an increase in cost. In addition, the operator does not need to keep pressing the operation switch during plate replacement work or blanket replacement work, and the workability of the replacement work can be improved.

  In the printing press safety device according to the present embodiment, the blanket cylinder 21 is provided with the second work notch 25 between the cylinder body 93 and the bearer 94, and the plate cylinder 23 has the cylinder body 64 and the bearer 65. A first work cutout 27 is provided between the two. Accordingly, it is possible to ensure high workability in the replacement work of the printing plate 63 and the blanket 92, and it is possible to appropriately cover the respective work notches 25 and 27 with the safety covers 29 and 31.

  Further, in the safety device of the printing press according to the present embodiment, a groove portion 66 for inserting an end portion in the winding direction of the printing plate 63 is provided in the outer peripheral portion of the plate cylinder 23 along the axial direction, and the printing plate is placed in the groove portion 66. A locking groove 66a for locking one locking portion 63a of 63 and a tension bar 67 having a locking claw 67a for locking the other locking portion 63b are provided. A locking lever 69 for rotating the tension bar 67 is provided. Further, a groove portion 95 for inserting an end portion in the winding direction of the blanket 92 is provided along the axial direction on the outer peripheral portion of the blanket cylinder 21, and a holding side winding shaft 96 for locking the end portion of the blanket 92 in the groove portion 95. The top end side winding shaft 97 is provided so as to be operable from the second work cutout 25 side. Accordingly, the respective safety covers 29 and 31 cover the locking levers 69 and the respective winding shafts 96 and 97 provided in the work cutout portions 25 and 27, so that the operator's hand can be touched during the printing operation. Therefore, safety can be further improved.

  In the printing apparatus safety device according to this embodiment, the first safety cover 31 is provided with the opening 87 facing the locking lever 69, and the operating arm 69 a is pressed through the opening 87 on the frame 62 side. An operating roller 79 for operating the locking lever 69 is provided by an air cylinder 76 so as to be movable. Accordingly, the safety of the operator can be improved by the first safety cover 31, and the workability can be improved by operating the locking lever 69 by the operating roller 79 and automatically replacing the printing plate 63. Can be improved.

  Further, in the safety device of the printing press according to the present embodiment, rubber plates 86 and 103 are attached to the inner surfaces of the safety covers 29 and 31. Therefore, even if the blanket cylinder 21 and the plate cylinder 23 come into contact with the safety covers 29 and 31, the surface of the blanket 92 and the printing plate 63 is not damaged, and damage to the blanket cylinder 21 and the plate cylinder 23 is prevented. Can do.

  Further, in the safety device of the printing press according to the present embodiment, the second safety cover 29 can be moved to the covering position for covering the second work notch 25 and the retreat position for exposing the second work notch 25. I support it. Therefore, when the printing operation is performed, the safety of the operator can be improved by moving the second safety cover 29 to the covering position. On the other hand, when the blanket 92 is replaced, the second safety cover 29 is moved to the retracted position. By doing so, the workability of the replacement work of the blanket 92 can be improved.

  Further, the rotary printing machine of this embodiment is composed of the paper feeding device 11, the printing units 12, 13, the turn bar device 14, and the folding machine 15, and the printing units 12, 13 are connected to the blanket cylinders 21, 22, respectively. 41, 42, plate cylinders 23, 24, 43, 44 and an ink supply device, and a first work notch for exchanging the printing plates at the axial ends of the plate cylinders 23, 24, 43, 44. Portions 27, 28, 47, 48, first safety covers 31, 32, 51, 52 that can cover the first work cutout portions 27, 28, 47, 48 are provided on the frame 62 side, and blankets A second safety notch 25, 26, 45, 46 is formed in the cylinders 21, 22, 41, 42, and the second work notch 25, 26, 45, 46 can be covered on the frame 62 side. Cover 29, 30, 49, 50 That. Therefore, each work cover 27, 28, 47, 48, 25, 26, 45, 46 is covered with each safety cover 31, 32, 51, 52, 29, 30, 49, 50, so that the worker While it is possible to improve the safety of the printer, it is not necessary to cover the entire printing unit, so that it is possible to suppress a decrease in print quality and an increase in cost.

  In the printing unit 13 in the newspaper offset rotary printing press of the present embodiment, the left and right blanket cylinders 21 and 22 and the blanket cylinders 41 and 42 are arranged vertically, and the blanket cylinders 21 and 22 and the blanket. The web W passes between the cylinders 41 and 42 and printing is possible. In this case, the operator performs maintenance on the blanket cylinders 21, 22, 41, 42 and the plate cylinders 23, 24, 43, 44 from the opposite side of the travel path of the web W. , 32, 51, 52, 29, 30, 49, 50 are provided for workers who perform this maintenance. That is, when the worker performs maintenance on the blanket cylinders 21, 22, 41, 42 and the plate cylinders 23, 24, 43, 44, the safety covers 31, 32, 51, 52, 29, 30, 49, 50 covers the respective work notches 27, 28, 47, 48, 25, 26, 45, and 46, and can prevent an accident in which a hand or the like is caught.

  In the above-described embodiment, the safety device for a printing press according to the present invention is applied to a newspaper rotary offset printing press. However, the present invention is not limited to this type of printing press and may be applied to a commercial printing press. In addition, the present invention may be applied not only to a rotary press but also to a sheet-fed press.

  The safety device for a printing press and a rotary printing press according to the present invention are provided with a safety cover that covers the cut-out portion for work, thereby suppressing a decrease in printing quality and an increase in cost and improving safety. It can be applied to any printing machine.

1 is a schematic view of a printing unit to which a safety device for a printing press according to an embodiment of the present invention is applied. It is sectional drawing showing the safety cover in the safety device of the printing press of a present Example. It is sectional drawing showing the plate clamping device in the safety device of the printing press of a present Example. It is a top view showing the safety device of the printing machine of a present Example. It is the schematic showing the offset rotary press for newspapers to which the safety device of the printing machine of this example was applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Paper feeder 12, 13 Printing unit 14 Turn bar apparatus 15 Folding machine 21, 22, 41, 42 Blanket cylinder (print cylinder)
23, 24, 43, 44 Plate cylinder (print cylinder)
25, 26, 45, 46 Second work notch 27, 28, 47, 48 First work notch 29, 30, 49, 50 Second safety cover 31, 32, 51, 52 First safety cover 62 Frame 63 Plate (printing plate)
65 Bearer 66 Groove 69 Locking lever (plate clamping device)
76 Air cylinder 79 Operation roller (operation member)
86 Rubber plate (elastic member)
87 Opening 96 Mouth side winding shaft (plate clamping device)
97 Mouth end side winding shaft (plate clamping device)
103 Rubber plate (elastic member)
W Web

Claims (12)

  In a printing machine in which a printing cylinder is rotatably supported with respect to a frame, and a printing plate that delivers ink to the outer periphery of the printing cylinder is mounted, the printing plate is replaced at the axial end of the printing cylinder And a safety cover capable of covering the work notch on the frame side.   The work notch has a predetermined width in the axial direction of the printing cylinder and is provided along the circumferential direction, and the safety cover has a width larger than the width of the work notch. 2. The safety device for a printing press according to claim 1, wherein at least a part of the work notch is covered.   The printing cylinder includes a cylinder main body on which the printing plate is mounted, and a ring-shaped bearer provided at an axial end of the cylinder main body, and the work cutout includes the cylinder main body and the bearer. The safety device for a printing press according to claim 1, wherein the safety device is provided between the two.   A groove portion for inserting an end portion in the winding direction of the printing plate is provided along the axial direction in the outer peripheral portion of the printing cylinder, and a first engagement for locking one end portion in the winding direction of the printing plate in the groove portion. A stop portion is provided, and a second locking portion for locking the other end portion in the winding direction of the printing plate is provided, and the working notch portion has the first locking portion and the second locking portion. The safety device for a printing press according to any one of claims 1 to 3, wherein a plate fastening device capable of operating at least one of the locking portions is provided.   The safety cover is provided with an opening portion facing the plate fastening device, and an operating member for operating the first locking portion or the second locking portion is movably provided on the frame side through the opening portion. The safety device for a printing press according to claim 4, wherein the safety device is provided.   6. The safety device for a printing press according to claim 1, wherein an elastic member is mounted on the printing cylinder side of the safety cover.   The said safety cover is supported so that a movement to the covering position which coat | covers the said work notch part, and the retreat position which exposes the said work notch part is possible. The safety device of the printing machine as described in 1.   A paper feeding device that feeds the web from the web, a printing unit that performs printing on the web fed from the paper feeding device, and a plurality of webs that have been printed by the printing unit are overlapped, cut, and folded. In a rotary printing press provided with a folding machine for forming a book, the printing unit is rotatably supported by a frame and two blanket cylinders that are in contact with each other with a print sheet interposed therebetween, and is rotatably supported by the frame. In addition, in a rotary printing press comprising a plate cylinder that is in contact with each blanket cylinder and an ink supply device that supplies ink to each plate cylinder, the printing plate is exchanged at the axial end of the plate cylinder. And a first safety cover capable of covering the first work notch is provided on the frame side.   A groove for inserting and locking one end in the winding direction of the printing plate is provided along the axial direction on the outer periphery of the plate cylinder, and the other end in the winding direction of the printing plate is engaged in the groove. A locking claw for stopping is provided, a plate clamping device capable of operating the locking claw is provided in the first work notch, and an opening is provided in the first safety cover so as to face the plate clamping device. The rotary printing press according to claim 8, wherein an operating member that operates the locking claw through the opening is movably provided on the frame side.   A second work notch for exchanging the blanket is provided at the end of the blanket cylinder in the axial direction, and a second safety cover capable of covering the second work notch is provided on the frame side. The rotary printing press according to claim 8 or 9, characterized in that.   A groove portion for inserting an end portion in the winding direction of the blanket is provided along the axial direction on the outer peripheral portion of the blanket cylinder, and one end portion and the other end portion in the winding direction of the blanket are locked in the groove portion. A locking member is provided, a blanket fastening device capable of operating each locking member is provided in the second work notch, and the second safety cover is a covering position that covers the second work notch The rotary printing press according to claim 10, wherein the rotary printing press is movably supported at a retreat position at which the second work notch is exposed.   The plate cylinder and the blanket cylinder have a cylinder body and a ring-shaped bearer, and the first work notch and the second work notch are provided between the cylinder body and the bearer. The rotary printing press according to any one of claims 8 to 11, wherein

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