JPH0244062B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing press, which is a device for printing a relatively large number of unit images on one plate surface in photolithography work, so-called multi-sided printing. relates to a light shielding device for a document holder in this printing press.

First, we will explain the procedure for multi-sided printing using a plate printing machine, together with the accompanying drawings, and clarify the background to the proposal of the present invention.

Figure 1 is a front view of an example of a rigid type plate machine, which is the most popular type of plate type machine because it has better conditions than flat type plate machines, and Figure 2 shows a front view of one example. ,
This is a plan view showing a state in which a manuscript is mounted on the manuscript holder of a dopant printing machine and the required measures (shading of areas other than the manuscript image area) have been applied. The procedure for obtaining a printing plate (6-sided printing) will be explained.

First, the plate material 2 is mounted on the plate material holder 1. On the other hand, along with this, the transparent plate 30 of the document holder 3
A document 4 is mounted on the surface, and at this time, an unnecessary portion 41 shown by diagonal lines other than the image portion 40 of the document 4 is provided with a light shielding means.

Therefore, the horizontal feed screw 5 and the vertical feed screw 6 are rotated by a required amount to move the document holder 3, that is, the document 4 to the first printing position on the second side of the plate material.

Then, the contact mechanism (not shown) is further driven to bring the document 4 into vacuum contact with the two sides of the plate and expose it to light, thereby printing the image of the frame shown in FIG. 3 on the first side of the plate.

Next, the close contact mechanism is driven to separate the document holder 3, that is, the document 4, from the two surfaces of the plate material, and the horizontal feed screw 5 is rotated by the required amount.
The original 4 is moved to the second printing position on the second side of the plate, and as described above, the original 4 is vacuum-adhered to the second side of the plate and exposed to light to print a frame image on the second side of the plate.

Hereafter, the image of the frame is printed in the same manner as the image of the frame, and the image of the frame is rotated by the vertical feed screw 6, and the feed screw 5 of the left and right direction is rotated by the required amount, and the rest is the same. Perform the burning operation according to the instructions.

In this way, the multifaceted printing plate shown in Figure 3,
In other words, a total of six unit images 4 from frame to frame.
This results in a 6-sided printing plate with 0 printed on it, but if left as is, the frames and the margins ('-') around the printed image area will become solid printing in the final printed matter. Therefore, it becomes necessary to expose this portion (' to ') as well.

By the way, when the original 4 is mounted on the original holder 3, the light shielding means for the unnecessary part 41 is of a fixed type (for example,
(covering the unnecessary part 41 with light-shielding paper), for the above-mentioned margin parts ('-'), after the above-mentioned printing operation is completed, the image part (frame-to-frame) is covered with a light-shielding means and then exposed to light. Burning down is required.

In order to drastically improve the workability in this respect, as shown in FIG. 4, four light shielding curtains 7A,
7B, 7C, and 7D on the transparent plate 3 of the document holder 3.
The light-shielding curtains 7A, 7B, 7C, and 7D are arranged in a slidable manner toward the center of the light-transmitting plate 30 on the top, bottom, left, and right sides of 0, and are opened and closed along with the above-mentioned printing operation ( This method (hereinafter referred to as the "movable light-shielding curtain method") was developed by the present applicant and has achieved great practical effects.

That is, when printing a frame image, once the original 4 is moved to a predetermined position on the second side of the plate material, the left and upper sides of the light-shielding curtain, whose tip has been set in advance at the required position (peripheral edge of the image area 40), are moved. By leaving the light-shielding curtains 7A and 7B at their set positions, and fully opening the right-hand and lower light-shielding curtains 7C and 7D (rolling up the light-shielding curtains to the end of the transparent plate 30), printing is performed. The margin area' was also exposed to light at the same time as the image of the frame was printed.
Regarding the frames, the left and upper light shielding curtains 7A and 7B continue to remain as they are, and the right light shielding curtain 7
By returning C to the initial setting position and printing with the lower light-shielding curtain 7D fully open, the margin area' is also exposed to light at the same time as the image of the frame is printed. By making it unnecessary to burn off the blank area ′′, and then printing from frame to frame while operating the light-shielding curtain in the same way, you can finally remove the blank area ′′.
〜'In all cases, burning off is completely unnecessary.

Now, the movable light-shielding curtain system that the present applicant and others have developed so far (currently there are no other systems developed for the same purpose other than the present applicant's) is as a driving means for the light-shielding curtain. Although electrical and electronic technological means such as pulse motors and air cylinders are interposed, they are certainly extremely effective in terms of labor-saving and high efficiency, but problems inevitably arise. In other words, the equipment itself is unavoidably expensive, and even though they are fully aware of the effects it will have, there are still a small number of workshops that are unable to implement it due to the amount of work to be done and financial issues. There is a problem that there is no
Conventional printing presses that adopt a manual system are widely used not only as a light shielding means around the document image area in this document holder, but also as a means for moving the document to a desired position on the plate surface. Proposing an inexpensive manuscript holder that retains the features of the curtain system and can be easily attached to these printing presses will greatly improve the work efficiency of the conventional printing presses that are currently widely used. It is certain that improvements can be made, and it can be asserted that it is of extremely practical significance.

The present invention was proposed based on the above recognition, and its features are separately described below.

(b) In order to ensure the accuracy of positioning the tip of the light-shielding curtain, it is absolutely necessary to guide the tip, so this method was adopted first.

(b) To reduce costs as much as possible by eliminating any electrical or electronic technical means as a drive source or control means for the blackout curtain.

(c) Fully opening or slightly widening the blackout curtain set at the required position, and locking (fixing) at that position;
And the return locking (fixing) operation to the initially set position can be performed easily, quickly, reliably, and accurately.

(d) Efforts are made to eliminate the complexity of the mechanism and ensure reliable operation;
It is designed to be durable, easy to repair and manage, and can be manufactured easily and inexpensively.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings (Figs. 5 to 8) showing one embodiment.

Reference numeral 8 denotes an operating body for setting the initial position of the light-shielding curtain 7, which includes a disc 80 with an operating knob 80' at the top, and a rotary shaft 82 with a bevel gear 81 attached to the bottom, which is connected to the support frame 9. Rotatably supported.

The bevel gear 81 is connected to a bevel gear 100 attached to the base end of a feed shaft 10 whose both ends are rotatably supported by the support frame 9.
Therefore, the operating knob 80'
When a rotational circular motion operation is performed with , the rotation axis 82→
Rotation is applied from bevel gear 81 to bevel gear 100, and feed shaft 10 also rotates at the same time.

In addition, the necessary parts of this feed shaft 10 have male screws 1.
Since the initial position setting base 11 constituting the light-shielding curtain guide has a female thread engraved with 01 and is engaged with this male thread 101, the feed shaft 10 is rotated as described above. When this is done, the initial position setting base 11 moves on the feed shaft 10 to either the left or right.

The above-mentioned initial position setting base 11 includes the base 11
The independent actuating body 13 is attached via the mounting plate 12 fixed to the
is held so that it can be moved left and right.

The independent operating body 13 is movable left and right because
A mounting plate 12 holding a large number of slide balls (not shown) has engagement grooves 1 for engaging the slide balls.
This is because the independent actuating body 13 with 30 is engaged.

The tip of the light-shielding curtain 7 is connected to the independent operating body 13 via a reinforcing body 70.
Further, a locking body 14 is attached to this independent actuating body 13, and this locking body 14 serves as an operation body for opening and returning the light-shielding curtain 7. The locking body 110 and the locking body 15 attached to the support frame 9 at the fully open position of the light-shielding curtain 7 can be engaged and detached.
The initial position setting claw 14a of the light-shielding curtain constituting the
Locking it in the initial position setting groove 110a provided in the locking body 110 of the initial position setting base 11,
As mentioned above, if the operation knob 80' is rotated and circularly operated, the initial position setting base 11 and the base 1
The independent actuating body 13 that is locked and fixed to the independent actuating body 1 and the light shielding curtain 7 whose tip end is connected to the independent actuating body 13 perform simultaneous integral movement in the same direction.

Therefore, while operating the operating knob 80', check the position of the tip of the light-shielding curtain 7 using the position setting scale 18 attached to the support frame 9, and when the light-shielding curtain 7 reaches the desired position, operate the curtain. Knob 80'
When the operation is stopped, the light shielding curtain 7 is set and fixed at the required position.

In this way, all the light shielding curtains 7A, 7B, 7
When the positions of C and 7D have been set and the light-shielding curtain 7 is to be fully opened as described above, the following procedure is to be followed.

The locking body 14 attached to the independent operating body 13 is
It is composed of a base body 14', an initial position setting claw 14a having a knob portion 14a', and a fully open position fixing claw 14b also having a knob portion 14b'.
Then, pinch the knobs 14a' and 14b' with your fingers,
At this time, if the connection spring 140 is held against the elastic force of the base body 14',
Both pawls 14a, 14b are lifted up using the pivot 141 to the base body 14' as a fulcrum, and the initial position setting groove 110a and the initial position setting pawl 14a are unlocked, so that the locking body 14 is lifted. If the light shielding curtain 7 is operated in the direction of fully opening while maintaining the same state, the independent operating body 13 will move in that direction independently from the initial position setting base 11, and the light shielding curtain 7 will be moved in the same direction. and move it.

Then, the locking body 14 is moved to the locking body 15 attached to the support frame 9. When this operation is performed, the proximal end 131 of the independent operating body 13 is moved to the locking body. Since it is designed and configured in advance so that it comes into contact with the wall surface 15W of the locking body 15, when the locking body 14 is moved until it can no longer be moved and the pressure on the knobs 14a' and 14b' is released, the fully open position is reached. The fixing pawl 14b is automatically locked into the groove 150 of the locking body 15, and thus the light shielding curtain 7 is locked and fixed in the fully open position.

To return the light-shielding curtain 7 that was fully opened by the above operation to the initial setting position, follow the same procedure as above to return the light-shielding curtain 7 to the original setting position.
4 in the opposite direction to the above, and moved the initial position setting pawl 14a until it hits the tall portion 110h of the locking body 110, in other words, until the locking body 14 can no longer be moved. By the way, when the pressure on the knobs 14a' and 14b' is released, the initial position setting pawl 14a is automatically locked in the initial position setting groove 110a of the locking body 110.

As described above, according to the present invention, the operation of fully opening the light shielding curtain 7 and returning it to the initially set position can be performed by simply turning the knob 1 of the locking body 14 without using any special nerves.
Pinch 4a' and 14b' and move it left and right, and when you reach the end, turn the knobs 14a' and 14b'.
If the pressure on 14b' is released, the purpose is automatically achieved, the operability is excellent, and the positioning accuracy of the tip of the light-shielding curtain 7 is also perfect, so it is fully practical.

By attaching the device of the present invention to a conventional type plate printing machine, it is possible to eliminate inefficient factors such as pasting light-shielding paper as a light-shielding means around the document image area in the document holder, and to As explained based on Fig. 4, by performing multi-sided printing while opening and returning each light shielding curtain to its fullest extent, the extremely troublesome task of burn-out is completely eliminated, which is not the case in the past. It is inevitable that the work efficiency of the plate printing machine will be dramatically improved.

Note that the locking body 110 has an initial position setting groove 110.
The reason why grooves 110b are provided at small intervals in a is to widen the light shielding curtain 7 by a small width and lock it in order to print a register mark around the image area when the original is a negative. The operation procedure is the same as when fully opening the light shielding curtain 7 as described above.

Further, the base end of each light-shielding curtain 7 is wound around a rotating shaft 16 containing a coil spring, so that the light-shielding curtain 7 is always under the winding action of the rotating shaft 16 and is in an expanded state. is retained.

Furthermore, 17 is the initial position setting base 11,
This is a guide shaft provided to ensure smooth operation on the feed shaft 10, and is fixed to the support frame 9 at both ends in parallel to the feed shaft 10.

[Brief explanation of drawings]

Fig. 1 is a schematic front view showing an example of a rigid printing plate, Fig. 2 is a schematic top view of a document holder, Fig. 3 is a top view of a multi-sided printing plate, and Fig. 4 is a schematic front view showing an example of a rigid printing plate. Figure 5 and the following are illustrations of embodiments of the present invention, Figure 5 is a top view of the document holder of the present invention, and Figure 6 is a perspective view of the main parts. FIG. 7 is an explanatory view of the operation of the operating body for returning the light-shielding curtain to opening, and FIG. 8 is a cross-sectional explanatory view of the operating body for setting the initial position. In the drawings, 21...shaft for changing the angle of the light-shielding curtain, 23...button, 24...fixing tool, 22...
...Represents each flange.

Claims (1)

[Scope of Claims] 1. An initial position setting device configured to be rotationally driven by the initial position setting operating body 8 and horizontally installed parallel to the center line of the transparent plate 30. Base 1
1, and an initial position setting device for setting the position of the light-shielding curtain, which is fitted onto the feed shaft 10 so as to move left and right by rotation of the feed shaft 10. Base body 11
Then, the side edge of the tip of the light-shielding curtain 7 is attached,
and the above-mentioned initial position setting base 11 and support frame 9
The light-shielding curtain 7, which is provided with a locking body 14 that locks and releases each locking portion, and is supported movably from side to side on the initial position setting base 11, is fully opened. A light-shielding device consisting of an independent operating body 13 for adjusting and returning to a set position, and a position setting scale body 18 attached to the surface of the support frame 9 for confirming the set position of the light-shielding curtain 7 is transparent. The light-shielding curtains 7 are arranged on the front, rear, left, and right sides of the light-transmitting plate 30, and are arranged so as to extend toward the center of the light-transmitting plate 30 from the front, rear, left, and right sides of the light-transmitting plate 30, respectively, and are configured to be driven independently. A light shielding device for the document holder.