JPS5922755A - Apparatus for holding press plate of sheet-fed rotary press - Google Patents

Abstract

PURPOSE:To provide the press plate holding apparatus of a rotary press enhanced in wokability and safety of press plate mounting, constituted so as to mount a support member for holding and supporting the press plate by a safety cover provided in a freely openable and closable manner in opposed relation to the peripheral surface of a plate cylinder and a guide member for guiding the press plate in contacted relation thereto. CONSTITUTION:A safety cover 22 is closed during printing work and a press plate 39 used in the next printing is inserted into a press plate guide 26 provided to the safety cover 22 while the lower end thereof is supported by a pin 37. When printing is finished, the safety cover 22 is upwardly opened to be perfectly engaged by a lock apparatus. In the next step, plate lock up vices 40, 41 are loosen to detach the used press plate 39 from a plate cylinder 9 while the pin 37 is pulled out to withdraw the new press plate 39 from a press plate guide 36 and both end parts thereof are held between guide rolls 42, 43 to guide the leading end thereof to the plate cylinder 9. The leading end of the press plate 39 is fixed in algned relation to the reference orifice of the plate lock up vice 40 in the biting side of the plate cylinder 9 to wind the press plate 39 around the plate cylinder 9.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a printing plate holding device that holds the bottom side of the printing plate outside the machine when it is installed.

A printing plate made of a thin aluminum plate is usually attached to the plate cylinder of a sheet-fed rotary printing press. When installing this printing plate, open the safety cover facing the surface of the plate cylinder, insert the printing plate through this opening, hold the gripping side in the plate vise of the plate cylinder, and then The cylinder is moved in increments by pressing a button, and the printing plate is rolled into the cylinder. In this case, operating the push button while holding the plate bottom with one hand is extremely inefficient and requires a lot of effort. Conventionally, the plate hanging parallel to the axial direction of the plate cylinder is carried out by supporting a rod between brackets protruding from the frame, and the plate end is hooked on the rod. Even if the weight of the printing plate can be supported, there is a risk that the printing plate may slip off the printing plate, so in the end it has to be held down by hand, and a great effect is not achieved. In addition, some special models have a device attached to the printing unit to hold the end of the plate, but the structure is complex and cannot be provided at low cost. Because it had to be transported, it was troublesome and required a long time to prepare.

The present invention has been made in view of the above points, and includes a holding member provided at both edges on the machine width side of a safety cover that can be opened and closed facing the peripheral surface of the plate cylinder, and a support member provided at the lower end of the safety cover. is provided between the lower end of the opened safety cover and the plate cylinder to hold and support the printing plate to be installed next time on the plate cylinder, and to prevent the plate cylinder from being released from the supporting member and sliding inside the holding member. By providing a guide member that attaches and guides the printing plate to be mounted on the plate, a simple structure using the existing safety cover can hold the printing plate for next installation and securely hold the bottom of the plate. To provide a plate holding device for a sheet-fed rotary printing press that is capable of being attached to the plate cylinder from the plate to improve workability and safety, shorten working time, and reduce labor in plate mounting work. It is. Embodiments of the present invention will be described in detail below with reference to the drawings.

Figures 1 to 5 show an embodiment of the plate holding device according to the present invention, Figure 1 is a schematic side view of a four-color sheet-fed rotary printing press that implements this, and Figure 2 is a plate holding device. 3 is a front view of the apparatus, FIG. 4 is a sectional view taken along line AA in FIG. 3, and FIG. 5 is an enlarged sectional view of a printing plate guide member. In the figure, a four-color sheet-fed rotary printing press 1 includes a paper feeder 2, four printing units 3, and a paper ejection device 4. A paper stacking table 6 that automatically rises as the process progresses, and left and right paper ejection frames 1
The stacked papers 5 arranged between them are suctioned one by one to the difference plate 8.
It is equipped with a sucker device R (not shown) that sends out upwards.

Each printing unit 3 also includes a plate cylinder 9 on which a printing plate is mounted by a mounting method described later, and a blanket cylinder 10 that is in contact with the plate cylinder 9 and onto which an image on the printing plate is transferred. , the paper 5 that is in contact with this blanket cylinder 10 and passes between the blanket cylinder 10
a double-diameter impression cylinder 11 that applies the printing pressure of the printing reservoir to the plate cylinder 9;
An inking device and a water supply device (not shown) are provided to supply ink and dampening water to the upper printing plate surface. Further, a swing device 12 is provided between the differential plate 8 and the printing unit 3 for the first color, which grips the paper 5 fed onto the differential plate 8 and transfers it to the claw of the impression cylinder 11. Furthermore, between the impression cylinders 11 of the adjacent printing units 3, there is a double-diameter transfer cylinder 13 that receives and transfers the paper 5 from the upstream impression cylinder 11 to the downstream impression cylinder 11.
are arranged respectively. In fact, the paper ejection device 4 has 4
A paper discharge cylinder 14 that is in contact with a colored impression cylinder 11;
A pair of left and right paper ejection chains 18 are provided stretched between a sprocket 15 coaxial with the paper ejection frame 16 and a sprocket 1γ on a sprocket shaft mounted on the front end of the paper ejection frame 16. 14, the paper 5 is transferred from the claw of the impression cylinder 11 to the claw of the paper discharge chain 18, and is conveyed by the movement of the paper discharge chain 18. Reference numeral 19 denotes a paper ejection tray on which the falling paper 5 is loaded after being released from the claw of the paper ejection chain 18, and it lowers automatically in response to a signal issued by detecting the level of the stacked paper 5, and when operated by a push button. It is configured to move up and down.

Each printing unit 3 of the printing press 1 roughly configured as described above includes left and right frames 20 that are integrally connected over the entire length of the machine base and connected by stays in the width direction of the machine, and the above-mentioned plate cylinder. 9. A fixed safety cover 2 is installed between the upper halves of the left and right frames 20, which are the parts that pivotally support the rubber cylinder 10, etc.
1 connects the rear half of the sheet feeding device 2 side, and the inside and outside of the sheet feeding device 2 are cut off. The front half of the upper half of the frame 20 on the paper ejecting device 4 side, which is the side not covered by the fixed safety cover 21, is isolated from the inside and outside by a safety cover that can be opened and closed and is indicated by the reference numeral 22 as a whole. . That is, a cover arm 24 formed in an inverted shape is pivotally supported by a pin 25 on a bracket 23 fixed to the center of the upper end surface of each of the left and right frames 20. The lower cover 28 is composed of a rectangular cover plate 26 having a large number of oval-shaped transparent holes 25 and covering between the left and right frames 20, and a support plate 2γ integrally formed at both ends of the lower cover 28. The upper end portion is pivotally supported by a pin 29. The support plate 27 is also provided with an upper cover 31 which has a large number of oval-shaped through holes 30, is formed to have the same width as the lower cover 28, and covers the upper part of the lower cover 28, and can be opened and closed to adjust the inking device. The structure is such that only the upper cover 31 can be opened and closed during maintenance or maintenance. on the other hand,
A long cover guide 32 having a U-shaped cross section is vertically fixed to the left and right frames 20, and includes a support plate 27, upper and lower covers 31, 28, and a cover arm 24.
The support plate 27KM is installed and the pin 33 is covered by the guide 3.
2. Particularly, they are constructed so that they can be integrally rotated about the pin 25 at the upper end while sliding the pin 33 within the cover guide 32 as shown by solid lines and chain lines in FIG. There is. This rotation moves the upper and lower covers 31.28 up and down, opening and closing the opening facing the circumferential surface of the plate cylinder 9. Reference numeral 34 is a stopper that restricts the upper limit of the opening of the safety cover 22 by contacting a pin 33 made of synthetic rubber, and 35 is fixed to the cover guide 32 and is stopped by elasticity at the upper limit of the opening of the safety cover 22. pin 3
This is a leaf spring that is pressed against the safety cover 3 to prevent the safety cover 22 from being lowered or closed.

The left and right support plates 2γ, which are the edges of the machine width side of the safety cover 22 formed to be openable and closable in this way, have long printing plates as holding members that are formed in a cross-section and have vertical edges facing inward. The guide 36 is divided into upper and lower parts and integrally formed, and a pin 3T having a rectangular head and serving as a support is removably fixed to both ends of the lower cover 28 by a nut 38. There is. By doing this, the third
The printing plate to be mounted next time on the circumferential surface of the plate cylinder 9, which is indicated by reference numeral 39 in the figure and FIG. is configured to be The pin 37 is removed from the lower cover 28 when the printing plate 39 is to be attached to the plate cylinder 9, and is inserted into the reference hole of the printing plate 39 and the reference hole on the plate cylinder side to position the printing plate 39. It is configured so that it can also be used as a reference bin.

Next, what is indicated by the reference numeral 39 in FIG. 40, and in the figure, the upper half on the rear side is shown being held by the printing plate guide 36 of the safety cover 22 from which the pin 3T has been removed.

41 is the other plate vise that holds the other end of the printing plate 39 when the printing plate 39 is wound around the circumferential surface of the printing cylinder 9. As shown in FIG. 2, between the opened safety cover 22 and the plate cylinder 9, there are each pair of guide rollers 4 as guide members.
2.43 are disposed and supported by the left and right frames 20. That is, a bearing 45 fixed to the frame 20 with a bolt 44 has guide rollers 42.
The bar 46 rotatably supports the roller bearing 43, and the bar 46 is rotatably supported in the bar hole 4T of the frame 20 so that it can move forward and backward. teeth,
A pair of recessed holes 50 and 51 are provided in which the balls 49 of the click mechanism 48 provided on the bearing 45 side are selectively engaged. The ball 49 of the click mechanism 48 is biased toward the roller receiver bar 46 by a compression coil spring 53 loaded between the ball 49 and the screw 52 screwed into the screw hole of the bearing 45, and the roller receiver bar 46 is pressed against the roller receiver bar 46 by an external force. It is configured to be positioned at two locations by pushing and pulling.

The guide rollers 42 and 43 are connected to the ball 49 and the recessed hole 50.
By positioning and fixing the roller support bar 46 in the extended position where the roller support bars 46 and 46 are engaged, the printing plate 39 is clamped and guided to the plate cylinder 9. When the roller support bar 46 is not in use, the frame 20 is It is configured so that it can be stored by being pushed to the side.

The operation of the printing plate holding device configured as above will be explained. During the printing operation, the safety cover 22 is closed in the position shown by the solid line in FIG. While printing is being performed with the printing plate 39 mounted on the printing cylinder 9, preparing the printing plate 39 to be used for the next printing,
As shown in FIGS. 3 and 4, it is held in a holding groove formed by a printing plate guide 36, and its lower end is supported by a pin 3T. When printing is finished, the operator climbs onto the deck between adjacent printing units 30 and opens the safety cover 22.

The safety cover 22 is buffered by bringing the pin 33 into contact with a rubber stopper 34, and at this position, the pin 33 passes over the leaf spring 35 and is stopped from descending. In addition,
Although not shown, a sliding locking device is provided, and by sliding the locking device, the safety cover 22 is completely stopped from descending. In this way, the safety cover 2
After opening 2, the plate vices 40 and 41 are loosened, and the used printing plate 39 is removed from the plate cylinder 9. Then, the lower end of the new printing plate 39 held by the printing plate guide 36 is supported with one hand, the pin 37 is pulled out, the printing plate 39 is pulled out from the printing plate guide 36, and both ends thereof are held between the guide rollers 42 and 43. After that, guide the tip to the plate cylinder 9.

Since a reference pin hole is bored in the printing plate 39, the pin 3T which also serves as a reference pin which was previously removed is inserted into this hole, and is fixed in alignment with the reference hole of the grip side plate vise 40. FIG. 2 shows this state, and the upper half of the printing plate 39 is connected to the printing plate guide 36.
is maintained. Therefore, when the plate cylinder 9 is moved in the direction of the arrow in the figure by operating the push button, the printing plate 39 is wrapped around the circumferential surface of the plate cylinder 9, the plate end is released from the printing plate puid 36, and the guide rollers 42.43 Stops inching when attempting to cross. During this wrapping around the plate cylinder 9, the free end of the printing plate 39 is completely held by the printing plate guide 36, so that
The operator does not need to touch the printing plate 39. Holding the bottom of the plate with one hand, move the guide rollers 42 and 43 onto the roller support bar 4.
6 and toward the frame 20, the movement is stopped at the position where the ball 49 of the click mechanism 48 engages with the recessed hole 51, and the holding of the plate bottom is released. At this time, the plate vise 41 on the rear side is rotating toward the front side, so the mounting of the printing plate 39 is completed by holding the end of the printing plate 39 with the plate vise 41. After positioning the printing plate 39, the used pins 33 are
After returning it to the safety cover 22 side and releasing the locking device, the safety cover 22 is lowered and closed. This operation is then performed for each of the four color printing units 3.

FIG. 6 is a front view, a plan view, and a side view of a printing plate support member showing another embodiment of the present invention, and in this embodiment, the lower end of a printing plate 39 held by a printing plate guide 36 is supported. A stopper 54 was used as a member instead of the pin 3T in the previous embodiment. That is, a rectangular hole 55 is bored in the cover plate indicated by the reference numeral 26 corresponding to FIG. The stopper 54 is rotated between a position where it protrudes from the hole 55 and supports the printing plate 39 and a position where the stopper 54 is recessed into the cover plate 26 through the hole 55 and is in the stored state, and is rotated by the leaf spring 5T in both positions. It is configured to be locked against movement. In this case 1. ! Since the reference pin for positioning '1lff1 is not shared by the stopper 54, it is provided separately.

In each of the above embodiments, a pair of guide rollers 42 and 43 are used as guide members for the printing plate 39, but the guide rollers 42 and 43 are
The printing plate 3 may be used individually, or it may be held between plate-like objects.
Any shape may be used as long as it guides the plate 9 to the plate cylinder 9.

As is clear from the above description, according to the present invention, in a plate holding device for a sheet-fed rotary printing press, holding members are provided at both ends of a safety cover that can be opened and closed and faces the circumferential surface of a plate cylinder,
A support member is provided at the lower end of the safety cover to hold and support the next printing plate mounted on the plate cylinder, and between the lower end of the opened safety cover and the plate cylinder, the plate is released from the support member and placed inside the holding member. By providing a guide member that attaches and guides the printing plate mounted on the plate cylinder without sliding, the plate to be used next time can be held using the existing safety cover during printing operations. Since it can be prepared in advance, the time required to transport the printing plate during plate changes is shortened and work efficiency is improved, and when the printing plate is attached to the plate cylinder, the bottom side of the plate is held with a safety cover, making it easier to hold the plate bottom. is no longer necessary, improving work efficiency and safety. In addition, following the opening operation of the safety cover, which is an essential operation when changing plates, the printing plate that was stored in the trench is placed in the appropriate position for mounting, so the work can be done without the need for any special movements. The performance is extremely good, and the subsequent installation work progresses extremely smoothly. Furthermore, by providing the plate holding device on the existing safety cover, no special holding device is required, so the device can be provided at low cost and the space occupied by the device can be reduced.

[Brief explanation of drawings]

1 to 6 show an embodiment of the printing plate holding device for a sheet-fed rotary printing press according to the present invention, and FIG.
A schematic side view of a color sheet-fed rotary printing press, FIG. 2 is a side view of a printing plate holding device and an enlarged side view of important parts, FIG. 3 is a front view, and FIG. 4 is a sectional view taken along line AA in FIG. FIG. 5 is an enlarged sectional view of a printing plate guide member, and FIG. 6 is a front view, a plan view, and a side view of a printing plate support member showing another embodiment of the present invention. 1... Sheet-fed rotary printing press, 3... Printing unit,
9...[jl, 20...frame, 22...
・Safety cover, 36...Plate guide, 37...
Pin, 39...Print L42゜43...Guide roller. Patent applicant Komori Printing Machinery Co., Ltd.

Claims (1)

[Claims] a holding member that extends to both edges of the machine width side of a safety cover that opens and closes an opening on the side opposite to the plate cylinder of the printing unit frame and that can be freely raised and lowered, and slidably holds the printing plate attached to the plate cylinder; A support member is provided at a lower end of the safety cover to support the lower end of the printing plate when the printing plate is held by the guide member, and a support member is fixed to the frame side and located between the opened safety cover and the plate cylinder. A plate holding device for a sheet-fed rotary printing press, comprising a guide member that slides along the guide member and guides the plate attached to the plate cylinder.