JP2884245B2 - Plate holding device for printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a printing machine in which an old plate fixed at both ends by a plate holding device and mounted on a peripheral surface of a plate cylinder is replaced with a new plate. And a printing plate holding device for holding a new plate.

[Conventional technology]

A notch having a substantially rectangular cross section is provided in the outer peripheral portion of the plate cylinder of the printing press, and a notch in a holding side end of a printing plate (hereinafter, simply referred to as a plate) is provided in the notch. A plate fixing device consisting of a vice on the side of the plate and a vice on the back side of the plate that is wound on the peripheral surface after being added to the plate, is fixed to the bottom of the notch And is extended in the trunk axis direction.

The conventional vise on the grip side and the rear side of the vise are formed by a long vise table extending in the body axis direction, and pivotally supported by a plurality of bolts at the edge of the vise table. It has a plurality of gripping plates that open and close by movement to hold and release the plate between the vise table, and a plurality of cams that engage with the edge notches of each of these gripping plates, The plurality of cams are fixed in parallel on a rotatable cam shaft. A plurality of compression coil springs for urging the gripper plate in the opening direction are interposed between the vise table and the gripper plate.

With this configuration, when the plate is held, when the cam shaft is rotated, the holding plate divided into a plurality of pieces in the body length direction is released from the engagement of the cam, and the compression coil spring is moved. Because the springs open at the same time, insert the edge of the plate between the gripper plate and the vise table, and then rotate the cam shaft in the opposite direction to the previous one. Swings and closes against the resilience of the plate, and holds the edge of the plate.

Further, for example, the apparatus disclosed in Japanese Patent Application Laid-Open No. 1-127346 is designed such that the rear side gripping surface of the plate, which is conventionally formed in the circumferential direction of the plate cylinder, is formed in the radial direction of the plate cylinder. A power platform and a gripping plate extend in the radial direction of the plate cylinder, and the ends of the plate are bent at right angles by a separate plate bending machine. With this configuration,
The butt-side end of the plate, with the gripper side edge held in the mouth and wrapped around the drum surface, has the bent part inserted between the vise stand and the gripper plate, and the cam mechanism swings the gripper plate. By moving the plate, the bent piece of the plate is held, and thereafter, by moving the entire rear side vice in the circumferential direction, the plate is uniformly stretched and closely adhered to the body circumferential surface.

By the way, in such a conventional printing machine, when the specification of the printed matter changes and the edition is exchanged from the old edition to the new edition,
Open the vise on the back side by rotating the camshaft, rotate the plate cylinder while holding one end of the plate released from the grip, and then open the vice on the side by the rotation of the camshaft. The old version is removed by releasing the other end of the version from the grip. Thereafter, the new plate is mounted by repeating the opening and closing of the plate vise and the rotation operation of the plate cylinder in the same manner.

[Problems to be solved by the invention]

However, in such a conventional plate exchange, the rotation operation of the cam shaft and the rotation operation of the plate cylinder must be performed manually or by a push button operation as described above.
In particular, working while holding the old version and the new version by hand requires a great deal of labor and requires skill. In addition, the new plate cannot be prepared for mounting on the plate cylinder during printing work, and the old plate that has been removed must be removed outside the machine during plate replacement work. However, not only the productivity is reduced, but also the automation of the entire plate changing operation is hindered by the plate holding.

[Means for solving the problem]

In order to solve such a problem, according to the present invention, a plurality of printing units provided with a plate fixing device that is disposed in an outer peripheral notch of a plate cylinder and fixes both ends of a plate wound around the cylinder are provided. In the printing press, an old plate holding mechanism for receiving and holding an old plate discharged by opening of the plate fixing device and rotation of the plate cylinder, and holding a new plate to be replaced with the old plate and supplied to the plate cylinder. A substantially flat plate holding member equipped with a new plate holding mechanism can be swung so that the tip of the printing plate holding member is located near the printing cylinder adjacent to the printing unit where plate replacement is performed, with its tip approaching or separating from the peripheral surface of the plate cylinder. To support.

(Operation)

When replacing a plate, the leading edge of the plate holding device, which holds the new plate in advance during the printing operation, is brought into contact with the peripheral surface of the plate cylinder. After stopping the plate cylinder at the position facing the part, opening the gripper-side vise and the tail-side vise to release the grip of the old plate, and rotating the plate cylinder approximately one turn, the old plate is a plate holding device. It enters and is held. Then, when the plate cylinder is rotated and the new plate is extruded with the holding plate vise facing the front end of the plate holding device, the plate vise closes and one end of the printing plate is added to the plate vise. ,
After turning the plate cylinder for about one rotation and closing the other plate vise,
The installation of the new version ends.

〔Example〕

1 to 12 show an embodiment in which the plate holding device according to the present invention is applied to an automatic plate changing device. FIG. 1 is a plan view of a plate cylinder in which the plate holding device is implemented, and FIG. 2 is FIG. II-II sectional view of
FIG. 3 is a sectional view taken along the line III-III of FIG. 1, and FIG.
-IV sectional view, Fig. 5 is a VV sectional view of Fig. 1, Fig. 6 is a vertical sectional view of the vice side vise before the plate is held, Fig. 7 is a side view of the plate vise opening / closing device, 8 is a partially cutaway side view of the upper half of the plate holding device, FIG. 9 is a partially cutaway side view of the lower half of the plate holding device, FIG. 10 is a side view of the plate holding device, FIG. FIG. 12 is a schematic side view of the entire plate changing apparatus embodying the present invention, and FIGS. 12 (a) to 12 (h) are schematic side views of the entire plate changing apparatus and main parts for explaining the plate changing operation. It is. In the figure, a notch 2 having a substantially rectangular cross section is provided on an outer peripheral portion of a plate cylinder 1 over substantially the entire length of the cylinder. Guides 3 and 4 formed in the notch are bolted to the notch bottom surface. The grip-side plate vice indicated by reference numeral 5 is provided with a vise table 6 having a substantially square cross section and extending in the trunk axis direction.
The thin portions 6a at both ends of the vise 6 are connected to the left and right guides 3,4.
The fitting is performed with the vertical movement restricted and the circumferential movement allowed slightly. The vise table 6 is slidably pressed at the intermediate portion thereof by a plurality of guides (not shown) fixed to the bottom surface of the notch 2 so as to restrict the floating. At a plurality of positions in the longitudinal direction of the vise 6, a screw hole 6b having a cross section shown in FIG. 4 is provided, and an adjusting screw 7 having a tapered end portion is screwed into the screw hole 6b. A pin hole corresponding to the adjustment screw 7 has a flanged pin 8 with a flange engaged in a gap between the vise table 6 and the wall surface of the notch 2.
Are slidably inserted with their tips in contact with the tapered surface of the adjusting screw 7. By doing so, the adjusting screw 7
When the is rotated, the vise table 6 is configured to move and adjust by a small amount in the circumferential direction by the action of the tapered surface.
5 is a stud 10 on the vise 6 side.
And a compression coil spring interposed between the notch 2 and the wall surface of the concave hole 2a for urging the entire plate vice 5 outward in the circumferential direction.

An L-shaped holding plate holder 11 shown in FIG. 5 is fixed to a plurality of inclined surfaces of the vise table 6 with bolts 12 and 13,
A pin 11a protruding horizontally from the holding plate holder 11 is provided with a holding plate 14 having the same overall length as the vise table 6 and having a substantially C-shaped cross section divided into three in the body axis direction. It is supported, and its gripping surface 14 a faces the gripping surface of the vise table 6. Although not shown, a plurality of ridges are formed on the grip surface 14a, and are engaged with the concave grooves on the opposed grip surface. On the bottom surface of the vise 6, a plurality of studs 15 whose sections are shown in FIG. 2 are planted in parallel in the body axis direction and project into the recesses 2a of the notches 2. Between the spring receiving pin 16 screwed into the screw hole and the lower end concave hole of the gripper plate 14, a compression coil spring 17 for urging the gripper plate 14 in the direction in which the gripper surface 14a closes is interposed. .

On the other hand, a plurality of bearings 18 formed in a rectangular shape are fixed in parallel with each other in the body axis direction by bolts at the center of the bottom surface of the notch 2, and these bearings 18 have camshafts having a hexagonal cross section. 19
Is rotatably supported by fitting a circular cross-section, and a plurality of plate holding cams 20 having a large-diameter portion and a small-diameter portion are arranged on the cam shaft 19 in parallel in the axial direction. It is attached to the shaft. The cam surface of each plate holding cam 20 is held by each holding plate 14
When the cam shaft 19 is rotated by a driving device to be described later, the large-diameter portion of the plate-holding cam 20 pushes the holding plate 14 against the elastic force of the compression coil spring 17. It is configured to swing in the counterclockwise direction in the figure to open the gripping surface 14a.

Inside the notch 2, a rear side vice indicated by reference numeral 30 is provided in parallel with the side vise 5. This vise side vise 30 is formed to be almost the same length as the trunk length and has a vertical surface bearing
It has a spring receiving bar 31 attached to the vertical surface of 18, and
The spring receiving bar 31 is fixed to the bottom surface of the notch 2 by a plurality of bolts 32. Spring receiving bar 31 is plate cylinder 1
Is provided between the regulating surface 31a and the wall surface 2b of the notch 2. The supporting shaft 33 has both ends close to the disk-shaped bearers 34 at both ends of the plate cylinder 1. The vice table 35 and the holding plate 36 which are extended and are each divided into three in the body axis direction form a holding surface 35 a, which extends in the radial direction of the plate cylinder 1.
The support shaft 33 is swingable about the anti-grip surface side so that the grip surfaces 35a, 36a are separated from and approach to each other with the grip surfaces 36a facing each other. Reference numeral 37 denotes an adjusting screw for connecting the three divided vise stands 35, and a right-hand screw and a left-hand screw are screwed into the screw holes of the respective vise stands 35.
The tool is inserted into the hole of the integrally formed collar portion 37a positioned between the vise bases 35 and rotated to adjust the distance between the vise stands 35.

In a concave portion 2c formed in the wall surface 2b of the notch 2, a cam 38 formed in a rod shape with a flat small-diameter portion 38a and an arc-shaped large-diameter portion 38b is rotatably mounted on the bearer 34. Is supported,
The protrusion 38c from the bearer 34 is formed in a hexagonal shape. Reference numeral 40 denotes a guide for guiding the rotation of the cam 38, which is fixed to the recess 2c of the cutout wall surface 2b by a bolt 41. Further, between the bottom surfaces of the plurality of spring holes formed at the opposite end of the vise table 35 and the bottom surfaces of the plurality of spring holes formed in the spring receiving bar 31, these vise tables 35 are provided. A compression coil spring 42 for urging the spring nut and the spring receiving bar 31 in a direction to separate them from each other is provided. The double nut 4 is slidably provided in a spring hole 31b above the spring receiving bar 31.
The flange of the spring shaft 44 whose moving end is regulated by 3 and the spring hole 31b
A compression coil spring 45 for urging the gripper plate 36 in a direction to separate the gripper plate 36 from the spring receiving bar 31 is mounted between the compression coil spring 45 and the bottom surface of the spring. Further, a compression coil spring 46 for urging the vise table 35 in a direction to separate the vise table 35 from the holding plate 36 is loaded in a spring hole above the vise table 35. Reference numeral 47 denotes a blanket cylinder in contact with the plate cylinder 1.

Next, an opening / closing drive device for rotating the cam shaft 19 and the cam 38 to open and close the plate holding surface will be described. The opening / closing drive device is provided near the left and right frames 50 that support the plate cylinder 1 and the blanket cylinder 47 and the like, respectively. However, in FIG. 1, it is on the left side for convenience of drawing.) The frame 50 side will be described. An air cylinder 51 as a driving device is mounted on the upper end surface of the frame 50 by a bracket.
On the other hand, a lever 53 and a lever 54 are positioned between the bearer 45 and the frame 50 on the grip side cam shaft 19 and the buttocks side cam 38. The levers 53 and 54 and the air cylinder 5
A link mechanism generally denoted by reference numeral 55 is provided between the link mechanism 1 and the link mechanism 1. That is, the piston rod of the air cylinder 51
The distal end of a rod 57 connected to 56 is pivotally attached to the free end of an L-shaped lever 59 rotatably supported via a bracket 58 on the upper surface of the frame 50. The lower end of the rod 60 whose upper end is pivotally connected to the free end of the lever 60 is pivotally connected to the free end of a lever 62 pivotally supported by a stud 61 on the frame 50 side. A lever 63 is integrally formed with the lever 62, and a free end of the lever 63 is pivotally attached to one end of a roller lever 64. Reference numeral 65 denotes a lever shaft rotatably supported by the left and right frames so that the movement in the axial direction is regulated. The lever 66 has a lever 66 that is restricted from moving in the axial direction and rotates. The free end of the lever 66 is pivotally attached to the center of the roller lever 64. That is, a four-joint link is formed by the levers 63, 66 and the roller lever 64. When the lever 62 is driven by the air cylinder 51 to swing, the roller lever 64 is moved to the lever 6 position.
It is configured to advance and retreat in the radial direction of the plate cylinder 1 with 3, 66. A roller 67, which selectively corresponds to one of the levers 53 and 54 in accordance with the rotation phase of the plate cylinder 1, is pivotally mounted on the tip of the roller lever 64.
The lever 53 or the lever 54 swings within the range indicated by the solid line and the chain line in the drawing, and the cam shaft 19 or the cam 38 rotates.

In the device on the right side, when the lever 53 is at the solid line position, the plate holding surface of the gripping plate vise 5 is closed, and when the lever 54 is at the solid line position, the buttocks plate vise is changed.
It is configured to open 30 plate holding surfaces.

Further, an opening / closing drive device (not shown in FIG. 7) having the same configuration as that described above is provided on the left frame side (hereinafter, simply referred to as the left side in FIG. 1) as viewed from the sheet feeding device. The drive device has exactly the same configuration as that shown in FIG. 7 from the air cylinder 51 to the roller 67,
Only the levers 53 and 54 are different. That is, in FIGS. 1 and 7, the right levers 53 and 54 have their tips directed upward from the camshaft 19 and the cam 38 in the figure. 53A,
A lever indicated by 54A has its tip directed downward from the camshaft 19 and the cam 38 in the figure. That is, the distal end of the left gripper lever 53A and the distal end of the right tail lever 54 have the same phase in the circumferential direction and are simultaneously opposed to the rollers 67 on both sides. As a result, when the left and right air cylinders 51 are simultaneously operated and the lever 54 is pressed by the right roller 67, the plate holding surface of the rear side vice 30 is opened and at the same time the lever 53A is pressed by the left roller and Is moved to the position shown by the dashed line, and the plate holding surface of the holding plate vise 5 is opened.

In FIG. 11, reference numeral 70 denotes a cover for covering the entire front surface of the plate cylinder 1 over its entire length, and an L-shaped lever 72 rotatably supported on the upper end surface of the frame 50 via a bracket 71.
The L-shaped lever 72 has a piston rod 74 of an air cylinder 73 pivotally supported on the frame 50 side.
Working end is pivotally mounted. By doing so, the air cylinder 73 is operated by a command from the control device to open and close in a range indicated by a solid line and a chain line in the figure.

The plate vise device and the opening / closing device thus configured are provided with a plate exchange device for exchanging a used old plate with a new plate to be used. That is, frame 50
A pair of left and right brackets 81 is fixed to the rear of the upper ends of the left and right frames 80 provided in the printing unit adjacent to the front of the printing unit, at a position obliquely above the plate cylinder 1, and is rotatable around these brackets 81. A loader 83 as a printing plate holding member, which is formed in a horizontally long rectangular shape having substantially the same length as the plate cylinder 1 in a front view, is fixed to the swinging support shaft 82 which is It is provided movably. On the other hand, the left and right frames 80
The air cylinder 84 connected to the control device
Is pivotally supported in the vicinity of the piston rod 85, and a working end of the piston rod 85 has a lever pivotally mounted on the frame 80 side.
86 and a lever 87 pivotally attached to the loader 83 side are pivotally attached. Thus, when the piston rod 85 of the air cylinder 84 advances and retreats, the loader 83 is moved through the levers 86 and 87.
Swings, and swings between a hanging posture indicated by a solid line and a tilting posture indicated by a chain line in the figure, so that the leading end moves in the direction of the distance from the peripheral surface of the plate cylinder 1.

As shown in FIG. 9, in the lower half of the loader 83, two guide plates 88 each having a V-shaped entrance portion are extended in the vertical direction. The vice side vise 30
The plate 89 is released from the grip by opening, and the plate 89 which is rewound by the rotation of the plate cylinder 1 enters in the direction of the arrow. On the other hand, at the upper end of the loader 83, a plurality of sets of brackets 90 each of which is formed into a pair of oval shapes.
Are provided at positions that are fixed to the tubular swing support shaft 82 and divide the loader 83 into approximately three equal parts in the width direction, and a convex 91 is supported by the brackets 90 of each set. The convex 91 has a band-shaped leaf spring 92 urged by a spring force in a winding direction, and a plate edge holding device generally indicated by reference numeral 93 is fixed to a rewind end of the leaf spring 92. I have. This plate edge holding device 93 has a holder 94 at the end of a leaf spring 92.
An L-shaped plate hook 95 pivotally supported on the plate is urged by a torsion coil spring 96 so as to be in an upright posture shown by a solid line. The bent end of the plate 89 that has entered between the guide plates 88 is hooked. That is, prior to the start of the work of replacing the plate 89, the entire plate edge holding device 93 is manually pulled down to the central standby position of the loader 83 with the leaf spring 92, and the air cylinder provided at the standby position. By moving the piston rod 98 of the 97 forward by a push button operation, the plate hook 95 is opened so as to occupy the chain line position against the elastic force of the torsion coil spring 96, and the holder 94 is held at the upper end of the plate hook 95. By pressing against the cover 99, the entire plate edge holding device 93 is configured to be stopped from rising against the pulling force of the leaf spring 92. Reference numeral 100 denotes a sensor comprising a light emitter and a light receiver and provided in the vicinity of the air cylinder 97. The sensor 100 detects the tip of the plate 89 which has entered between the guide plates 88, thereby detecting the piston rod 98 of the air cylinder 97. Is retracted, and the plate hook 95 is set up in a solid line state by the elastic force of the torsion coil spring 96. As a result, the bent end of the plate 89 is hooked on the plate hook 95, and the lock of the holder 94 is released, so that the entire plate back holding device 93 is raised with the plate 89 by the pulling force of the leaf spring 92, and the plate 89 is raised. The configuration is such that 89 is drawn into the loader 83 and stored.
Further, the pin 102 is slidably supported by a compression coil spring 103 in a pin hole of a block 101 provided at an upper end portion of the loader 83 in correspondence with the plate hook 95 in a direction in which the pin 102 comes out of the block 101. The compression coil spring 103
By pushing against the resilience of the plate, the upper end of the plate hook 95 is pushed and tilted as shown by the dashed line, and the bent portion of the plate 89 is released from holding and can be removed from the loader 83. It is configured to be.

Next, the plate feeding device will be described. On the surface of the loader 83, a plurality of one-stage units are connected to the suction air source and suck and hold the new plate 105 to be supplied to the plate cylinder 1 instead of the old plate 89. (Not shown) are provided, and the lower suction pad 104 is formed so as to be movable in the vertical direction. That is, above the lower suction pad 104, a pair of left and right air cylinders 106 is supported on both side plates of the loader 83 via the bracket 107, and the suction pad 104 is
Are mounted side by side on a bar 109 having both ends fixed to the piston rod 108, and as the piston rod 108 moves forward, the bar 109 holding the new version 105 is shown by a chain line from a position shown by a solid line in the figure. The new plate 105 is moved to the position and the new plate 105 is supplied to the holding side plate vise 5 which is open to the front end thereof. 110 is fixed to the left and right side plates of the loader 83, and
It is a rack that smoothly moves forward and backwards. Also, 112 is slidably fitted into the pin hole of another bar 113, and the compression coil spring 1
The reference pin is urged in the protruding direction at 14 and fits into the reference hole of the new plate 105 to position the new plate 105.

On the other hand, an arm shaft 115 is rotatably supported at the lower end of the loader 83, and roller arms 116 are fixed to both side protruding portions of the arm shaft 115 from the loader 83,
A plurality of rollers 118 formed in a brush shape, for example, are rotatably arranged on a roller shaft 117 fixedly supported between the free ends of both arms 116. The working end of the piston rod 121 of the air cylinder 120 fixed to one end in the width direction of the loader via the bracket 119 has a connecting plate.
A lever 123 is fixed via 122, and a free end of a lever 124 fixed to the arm shaft 115 is pivotally attached to a lower end of the lever 123. Thus, when the piston rod 121 of the air cylinder 120 advances and retreats, the arm 11
6 rotates between a storage position shown by a solid line in FIG. 9 and a use position shown by a chain line. In the use position, the rollers 118 are pressed against the plate 105 on the plate cylinder 1 and the plate 105 is brought into contact with the plate cylinder 1. , And the bent back end of the plate 105 is inserted into the open vice 30. Further, on the arm shaft 115, a plurality of rollers 125 formed, for example, in a brush shape, which guide the new plate 105 supplied to the plate vise 5 in sliding contact therewith, are arranged in parallel. Reference numeral 126 denotes an application roller of an inking device which is brought into contact with the plate surface on the plate cylinder 1 and adheres ink to the plate surface. Generally, four or more rollers are provided.

The respective devices configured as described above and, for example, a servo motor for rotating the plate cylinder 1 are connected to a control device (not shown), and are configured to operate at a predetermined timing.

The operation of the plate exchange device provided with the above plate holding device will be described. During the printing operation, as shown in FIG. 12 (a), the loader 83 is suspended from the swing support shaft 82, and in this state, the new plate 105 is sucked by the suction pads 104 in a plurality of stages, and By being fitted to the reference pin 112, it is positioned and mounted on the loader 83. When the plate bottom holding device 93 in the loader 83 is manually pushed down and the air cylinder 97 is operated by a push button operation, the piston rod 98 moves forward and presses the plate hook 95. It is tilted and opened as shown by the dashed line.

When the old version 89 is replaced with the new version 105 after the printing operation is completed, when the start button is pressed, the air cylinder 73 is operated, and the cover 70 is moved through the L-shaped lever 72 as shown by a chain line in FIG. Upon opening, the air cylinder 84 is operated, and the loader 83 is tilted to the plate exchange position shown in FIG. 12 (b) via the levers 86 and 87. In addition, the servo motor rotates to rotate the plate cylinder 1
Is rotated by a predetermined angle until it occupies the plate discharging position. In this case, as shown in FIG. 12 (c) and FIG.
30 faces the distal end of the loader 83, and the right roller 67 contacts the distal end of the lever 54 on the cam shaft 38 as shown in FIG. In addition, the left roller has a distal end opposed to the lever 53A on the camshaft 19 having the same phase as the lever 54, and in this state, the left and right air cylinders 51 operate simultaneously. Vice-side vise 5 and butt-side vise 30
And open simultaneously.

In this state, the rear end of the old version 89 protrudes from the open gripping surface of the rear version vise 30, and the guide shown in FIG.
Since the plate cylinder 1 rotates in the direction opposite to the arrow in FIG. 9, the trailing side of the old plate 89 enters between the guide plates 88 of the loader 83. When the entered old plate 89 passes through the sensor 100, the sensor 100 detects this and activates the air cylinder 97 to move the piston rod 98 forward and backward, so that the plate hook 95 stands up as shown by a solid line in FIG. As a result,
The hook 95 is hooked on the bent end of the old plate 89 and the holder 94 is unlocked, so that the entire plate back holding device 93 is raised by the pulling force accumulated in the leaf spring 92 provided on the convex 91, and The old version 89 held by the hook 95 is drawn into the loader 83 and stored. FIG. 12D shows a state in which the old version 89 is being discharged.

When the plate discharging operation is completed in this way, the servomotor operates to slightly rotate the plate cylinder 1, and the open plate holding surface of the holding plate vise 5 is held by the loader 83 as shown in FIG. The bar 105 descends while stopping at a position that is on the extension of the new plate 105 and the air cylinder 106 operates to rotate the pinion 111 on the rack 110, so that the new plate 105 held by the lower suction pad 104 The new plate 105 descends while being guided while sliding on the rollers 125, and the new plate 105 is inserted into the holding plate vise 5 with its holding side end. At this time, since the lever 53 shown in FIG. 7 faces the roller 67, when the air cylinder 51 operates, the cam shaft 19 rotates together with the lever 53, and
5 is added to the vice 5 on the holding side. FIG. 12 (e) shows this state.

In this state, the servo motor rotates to rotate the plate cylinder 1 in the direction of the arrow, and the new plate 105 is wound around the peripheral surface of the plate cylinder 1 and its rear bent end stops at a position corresponding to the roller 118. I do. Thereafter, the air cylinder 120 is actuated, the piston rod 121 is retracted, the arm 116 is rotated via the levers 123 and 124, and the brush-like rollers 118 are pressed against the peripheral surface of the plate cylinder 1, and the new plate 105 is bent at the tail side. The end is inserted in the vice side vise 30. When the plate cylinder 1 rotates, the rollers 125 rotate while being pressed against the surface of the new plate 105, so that the new plate 105 comes into close contact with the peripheral surface of the plate cylinder 1. FIG. 12 (f) shows a state in which the plate cylinder 1 is being rotated, and FIG. 12 (g) shows a state in which the plate cylinder 1 is stopped after being rotated. When the trailing end of the new plate 105 is inserted into the trailing vise 30, the left air cylinder operates and the rollers press down the lever 54A. Close and add the insertion end of the new edition 105. At the end of the rotation of the cam 38, the vise table 35 and the holding plate 36 move in the circumferential direction of the plate cylinder 1 integrally, so that the new plate 105 is stretched and adheres closely to the peripheral surface of the plate cylinder 1. .

Thereafter, the piston rod 85 of the air cylinder 84 retreats and pulls the levers 86 and 87, so that the loader 83 hangs down as shown in FIG. Since 70 is closed, the printing operation can be resumed.

After restarting the printing operation, if the user presses the pin 102 while standing in front of the loader 83 at an appropriate time, the plate holder 95 tilts to release the old version 89 from holding, so that the old version 89 can be removed from the loader 83. In addition, as described above, the new edition 105 can be mounted on the loader 83 and prepared during the printing operation. Then, the space between the printing units in the state where the loader 83 is stored is not reduced.

In this embodiment, an example in which the present invention is applied to an automatic plate changing apparatus is shown. However, the present invention is not limited to this. The plate holding apparatus may be operated by a push button operation or the like.

〔The invention's effect〕

As apparent from the above description, according to the present invention, in the printing press, the old plate holding mechanism for receiving and holding the old plate discharged by releasing the plate fixing device and rotating the plate cylinder, and replacing the old plate with the plate. By providing a plate holding device having a new plate holding mechanism for holding a new plate to be supplied to the cylinder, preparation of a new plate and removal of an old plate from the plate cylinder can be performed outside the plate exchange time. Therefore, the preparation time is greatly reduced, the productivity is improved, and the labor is reduced because it is not necessary to hold the plate by hand. In addition, the plate holding member having a substantially flat shape is swingably supported on the upper part of the printing unit adjacent to the printing unit for plate replacement so that the tip thereof approaches and separates from the peripheral surface of the plate cylinder. As a result, only one drive source is required for moving the leading end of the plate holding member toward and away from the peripheral surface of the plate cylinder, and the drive can be performed with a simple drive mechanism. In addition to the simplicity, the operation of approaching and separating the plate holding member from the plate cylinder peripheral surface is simplified, so that the operation time is reduced, and the work time required for plate replacement is reduced. In addition, since the printing plate holding member is positioned along the outer surface of the printing unit adjacent to the printing unit for performing plate replacement, plate replacement work, ink replacement, and maintenance work are easy, and the workability is reduced. It also functions as a safety cover during printing.

[Brief description of the drawings]

1 to 12 show an embodiment of a plate holding device according to the present invention. FIG. 1 is a plan view of a plate cylinder in which the plate holding device is implemented, and FIG.
The figure is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a sectional view taken along the line III-III in FIG.
FIG. 4 is a sectional view taken along line IV-IV of FIG. 1, and FIG.
FIG. 6 is a vertical sectional view of the vice side vise before the plate is held, FIG. 7 is a side view of the plate vise opening / closing device, and FIG. 8 is an upper half of the plate holding device. 9 is a partially cutaway side view of the lower half of the plate holding device, FIG. 10 is a side view of the plate holding device, and FIG. 11 is a plate changing device embodying the present invention. FIGS. 12 (a) to 12 (h) are schematic side views of the entire plate changing apparatus and main parts shown for explaining the plate changing operation. 1 ... plate cylinder, 2 ... notch, 5 ... side plate vise, 30
…… Vise on the butt side, 82 …… Swing pivot, 83 …… Loader, 89…
… Old edition, 93 …… Ass holding device, 104 …… Suction pad, 105
...... New version.

Claims (1)

(57) [Claims] 1. A printing press comprising a plurality of printing units provided in a notch of a plate cylinder and provided with a plate fixing device for fixing both ends of a plate wound around the cylinder, wherein the printing plate is provided. An old plate holding mechanism for receiving and holding an old plate discharged by opening of the fixing device and rotation of the plate cylinder, and a new plate holding mechanism for holding a new plate to be supplied to the plate cylinder by replacing the old plate. A flat plate holding member is swingably supported on an upper portion of a printing unit adjacent to a printing unit for performing plate replacement such that a tip of the printing plate holding member approaches and separates from a peripheral surface of the plate cylinder. Plate holding device of a printing press.