JP3530257B2 - Plate insertion device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate insertion device for pushing a plate tail into a gap of a plate cylinder. 2. Description of the Related Art FIG. 4 shows a conventional apparatus for inserting a plate tail into a gap of a plate cylinder when a plate is mounted in an offset printing press. In FIG. 4, reference numeral 1 denotes a plate whose both ends are bent at a predetermined distance from a metal such as aluminum or iron having a thickness of 0.2 to 0.3 mm. Reference numerals 1a and 1b denote both bent end portions, that is, a gripping side and a gripping butt side (that is, a printing edge). 3a is one edge of the gap 3, 3b is the other edge on the normal rotation side of the one edge 3a, 3c is a position near the center of the gap 3, 4 is a tension bar of a clamping device for a plate cylinder, and 5 is a tension bar. The plate tail 1b is inserted into the groove of the bar. In order to mount the plate 1 on the plate cylinder 2, FIG.
When the gap 3 of the plate cylinder 2 stops at the plate mounting position as shown in FIG. 7, the grip side 1a of the plate is first hooked on the grip portion 2a of the plate cylinder through the gap 3. Next, the printing press roller 6 is wound around the printing drum 2 while being pressed against the printing drum 2 via the printing plate 1, and is rotated by about 1 forward. When the gap 3 comes near the printing position, the printing drum 2 is stopped. Next, when the tension bar 4 is turned to the loosened position, the groove 5 is directed to the gap 3 direction, so that the plate tail 1b is inserted into the groove 5 through the position 3c near the center of the gap 3, and then the plate cylinder 2 is slowly turned upright. 5 (b) with the rolling plate pressing roller 6 or a blanket cylinder (not shown) in contact with the roller.
As shown in (1), the plate tail 1b is fully inserted into the groove 5. Next, the tension bar 4 is turned to the tightening position, and the plate bottom 2b is turned by the tension bar 4 in the direction of the holding side 2a of the plate.
The plate is fixed as shown in (c). [0004] In the conventional plate insertion device as described above, if the plate edge is bent so that the tip of the plate edge is located near the center of the gap, the gap interval is about 5 m.
If the width is as wide as about m, no problem such as failure to insert the bottom of the plate will occur, but if the width is narrow (about 2 mm or less), the entire width of the plate bottom (axial direction of the plate cylinder) will be inserted into the gap at the same time. Swelling in the width direction, and the tip of the plate bottom rises slightly, so that the tip of the plate bottom does not enter the gap.
The reason why it does not enter is that the leading edge of the plate bottom comes into contact with the circumferential surface (hereinafter referred to as the surface) of the grip portion of the plate cylinder or the tip of the grip portion of the plate cylinder beyond the gap. SUMMARY OF THE INVENTION It is an object of the present invention to propose a plate inserting apparatus capable of reliably inserting a plate tail into a narrow gap. [0006] Disclosed in order to achieve the means] in order to achieve the above object of the present invention configuration, the distal end portion of the plate rear in contact with the surface of the plate cylinder and offset to one side in the width direction position In addition to providing an end pressing pusher for pressing with
After the tip enters a certain width gap,
An intermediate pressure pusher is provided to press the tip near the center.
And wherein the digit. According to the present invention, the plate is wound around the plate cylinder by the above means, and the leading end of the plate is short of the gap (0 to 5 mm).
When it comes to the end, the end pressing pusher deviated to one side in the width direction moves and presses the leading end of the plate, and the leading end slides on the surface of the plate cylinder and enters the gap from the same end, and a certain width, After the leading edge enters the gap, the intermediate portion pressing pusher sequentially moves to press the vicinity of the center of the plate edge, so that the entire width of the leading edge of the plate enters the gap, and the entire width of the leading edge of the plate enters the gap, and then the plate again. Rotate the body slowly forward and press the plate holding roller or
Using the blanket cylinder that abuts, insert the plate tail uniformly through the gap into the groove of the tension bar. FIG. 1 shows a plate insertion device according to the present invention, and FIG. 2 shows a plate bottom insertion sequence. In FIG. 1, the same symbols as those in FIG. 4 indicate the same members. That is, 1 is the plate, 1a is the side of the plate, 1b is the plate bottom,
2 is a plate cylinder, 2a is a holding portion, 3 is a gap, 4 is a tension bar, 5 is a groove of the tension bar, and 6 is a plate pressing roller. 3b indicates the other edge of the gap 3 in front of one edge 3a. When the grip side 1a of the plate is hooked on the grip portion 2a of the plate cylinder from the gap 3 stopped at the plate mounting position, and the plate holding roller 6 is pressed against the plate cylinder 2 via the plate 1, the plate cylinder is pressed. 2
When the plate 1 is wound around the plate cylinder 2 and the leading end 11 of the plate bottom 1b comes close to the position where it touches the surface of the plate cylinder 2, the leading end 11 of the plate bottom is in front of the edge 3b of the gap 3. The plate 1 is bent as shown in FIG. Next, a flat surface 12 of a shaft 12 parallel to the axial direction of the plate cylinder 2 and fixed between a pair of frames (not shown).
a is provided with an end pressing pusher 13 and an intermediate pressing pusher 14. The end pressing pusher 13 presses one end 11e of the plate edge 1b, and presses the middle pressing pusher 1b.
4 presses 15 near the center of plate edge 1b. In FIG. 1, the pushers 13 and 14 are direct-acting pushers each composed of a roller 16 for holding the plate tail 1b and an air cylinder 17, but other rotary or oscillating pushers can also be applied. As shown in FIG. 2 (a), when the fore-end 11 comes to a position where it touches the surface of the plate cylinder 2, the end pressing pusher 13 presses the end 11e. Slides into the gap 3 from the end 11e. Fig. 2 when the leading end 11 of a certain width enters the gap 3
As shown in (b), the central portion 15 of the plate edge 1b is pressed by the intermediate portion pusher 14, so that the entire plate edge 1b enters the gap 3. When the plate cylinder 2 enters, the plate tail 1b is uniformly inserted into the groove 5 of the tension bar 4 through the gap 3 by the plate pressing roller 6 or the abutting blanket cylinder (not shown) while slowly rotating the plate cylinder 2 forward. Next, the plate clamping device of the plate cylinder turns a tension bar (not shown) to a clamping position, and as shown in FIG. 2C, overlaps the plate bottom 1b on the grip side 1a of the plate and presses and fixes it with the tension bar 4. I do. The plate clamping device (tension bar 4) is not limited to FIG. Plate cylinder 1
When the length of the plate becomes longer in the axial direction and the width of the plate becomes wider, the number of pushers provided near the center of the plate cylinder may be plural. In this case, it is preferable that the pushers be operated in order from the side where the plate bottom is first placed. As described above, according to the present invention, there is provided an end pressing pusher for pressing the leading end of the plate edge in contact with the surface of the plate cylinder at a position deviated to one side in the width direction. Since the end pressing pusher first presses the end of the fore end of the plate, the end of the fore end of the plate can easily enter even in a narrow gap. Since the middle part pusher is provided to press the tip of the buttocks, the middle part pusher pushes the middle part of the plate buttocks whose ends are inserted into the gap, so the tip of the plate buttocks rises even in a narrow gap This has the effect that the entire back of the plate can be smoothly inserted into the gap without any change.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing one embodiment of the present invention. FIGS. 2A and 2B are explanatory views showing a procedure for inserting a plate edge, in which FIG. 2A is a cross-sectional view before insertion, FIG. 2B is a front view of the initial stage of insertion, and FIG. FIG. 3 is a side view of the plate. FIG. 4 is a perspective view showing a conventional example. FIGS. 5A and 5B are explanatory views showing a conventional procedure of inserting the bottom of a plate, in which FIG. 5A is a cross-sectional view before insertion, FIG. 5B is a cross-sectional view immediately after insertion, and FIG. [Description of Signs] 1 plate 1b plate bottom 2 plate cylinder 11 plate bottom end 13 end pressing pusher 14 intermediate pressing pusher

Claims (1)

(57) [Claims] [Claim 1] The tip of the plate edge that contacts the surface of the plate cylinder is
An end pressing pusher for pressing at a position deviated to one side in the width direction is provided, and the end pressing pusher is arranged in parallel with the end pressing pusher.
After the tip enters a certain width gap, the tip
A plate insertion device characterized in that an intermediate portion pressing pusher for pressing the portion near the center is provided .