JPS638680Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a paper discharge mechanism in a sheet-fed printing press, and particularly to one in which a suction device is used in the paper discharge mechanism.

In conventional sheet-fed printing machines, the printed paper is conveyed to a predetermined position by several grippers connected in a chain to align the paper, but due to the high printing speed, the paper is It is not possible to properly place the printed paper on the stacking table, so a suction wheel equipped with an air suction device is installed to suck the printed paper being transported and stack it.
However, although this method is good for single-sided printing,
In double-sided sheet-fed printing machines, the ink does not dry between the time printing on the back side is completed and the printing paper is transported and loaded, resulting in a discrepancy between the speed of the printing paper and the peripheral speed of the suction wheel during suction. As a result, a slip phenomenon occurs, making it impossible to produce good printed matter and resulting in many defective printed matter, which also poses an economical problem.

The present invention has been newly developed to solve the above-mentioned problems, and includes a printing paper suction mechanism that rotates a suction wheel to attract the end of the printing paper to an air suction hole, and the suction In a paper discharge mechanism of a sheet-fed printing press that includes a suction wheel moving mechanism that allows the wheel to be positioned and moved freely from side to side, the suction wheel has at least 6 to 8 small holes or the like on the approximately semicircular surface of the suction wheel. A suction wheel consisting of air suction holes provided at intervals and an air suction groove that allows the end of the printing paper to be moved while suctioning it to a certain position is provided at the end of the air suction hole. One rotation of the wheel and one printing process of the printing paper are simultaneously rotated, and air is constantly sucked through each suction hole through a suction tube connected to an air hose, and the end of the printing paper being conveyed is removed by the suction wheel. To provide a print suction device for a paper discharge mechanism in a sheet-fed printing machine, which aims to prevent slippage during suction and to convey and place printed paper well by suctioning the paper. It is something.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic explanatory diagram of a printed paper suction device of a paper discharge mechanism in a sheet-fed printing press of the present invention, and 1 is the printed paper suction device. This printing paper suction device 1
The suction wheel holder 8 includes a circular suction wheel 3 mounted on a suction axle 2 and a suction tube 6 connected to an air hose 7 inside. Suction wheel 3
has several suction holes 4a and a suction hole 4b having suction grooves 5, and each suction hole 4
A and 4b are designed to constantly suck air through a suction tube 6. That is, the fixed suction tube 6
Since a certain amount of air is always sucked in,
By the rotation of the suction wheel 3, each suction hole 4a, 4
Air will be sucked from b. The rotation of this suction wheel 3 is one rotation of the printing mechanism (not shown) (one printing process of printing on printing paper).
The suction wheel 3 is also designed to be able to rotate once. Reference numeral 9 denotes a suction wheel frame stand, which is fixed to the suction wheel holder 8 with bolts 10. 11 is a key for the suction axle 2, and 12 is a sprocket. In addition, 13 is a suction wheel frame, 14 is a rear paper alignment plate, and 15 is a paper alignment plate fixing angle. Next, the entire mechanism of the paper discharge device using the present device will be described in detail with reference to Figure C. First, the printed paper suction device of the present device is installed at the bottom of the suction wheel moving device 16. The moving device used is the same as the suction wheel moving device shown in the paper discharge mechanism for a sheet-fed printing press (Japanese Unexamined Patent Publication No. 55-29901) which the applicant has already developed and applied for. The printing paper suction mechanism used in this device is equipped with a suction wheel with a sprocket consisting of one suction hole, and is configured so that the rump of the printing paper is constantly attracted from the suction hole by rotation of the suction wheel. has been done. The present invention is an improved device for this suction wheel. In addition, to move the printed paper suction device 1 left and right, the suction wheel moving shaft 17 fixed to the gear 18 is rotated, and the suction wheel frame 1
Move the rack 22 fixed at 3. By moving this rack 22, the entire printed paper suction device 1 can be moved left and right.

Next, we will discuss the operation, functions, etc. of the device in question in the second section.
To explain in detail from Figures A and B, first, as shown in Figure 1C, the printing paper A is gripped by the gripping portion 33 of the gripper 32 and pulled to the left by the rotation of the chain 30. As it moves, the butt end 35 passes over the printed paper suction device 1 of the present device. Figure A shows a further enlarged view of the passing state. As shown in FIG.
When the paper B reaches a position directly above the suction wheel 3, the printing paper B is in the state shown in a of FIG. In this state, the rear end of the print paper B starts to be sucked by the suction hole 4b of the suction wheel 3, while the front end of the print paper B continues to be held by the gripper 32. Therefore, the printing paper B is kept under tension due to the pulling force of the gripper 32 and the suction force of the suction hole 4b (see the state B in FIG. 2B). Next, when the suction wheel 3 rotates in the direction of the arrow and the printing paper b moves to the state of the printing paper C, the gripping portion 33 of the printing paper C is separated from the gripper 32 as shown in FIG. buttock 3
5 is in a state of being sucked into the suction hole 4b as shown in FIG.
(See condition c in Figure B). Similarly, even when the printing paper C is moved to the position of the printing paper D, the buttock 35 remains sucked into the suction hole 4b (see Figure 2b-d). In this way, printing paper B, C,
D is sucked into the suction hole 4b because the suction hole 4
This is due to the continuous suction of air from the suction groove 5 connected to b. Then, when the suction wheel 3 further rotates in the direction of the arrow from the state of the printing paper D,
As shown in d of FIG.
It falls almost horizontally. Then, as shown in FIG. 2B, almost at the same time as the front part of the dropped printing paper D hits the paper rest 36, the rear part is also sequentially dropped into the rear paper aligning section 14, and the printing paper A will be neatly stacked on the paper stacking stand 37 without any irregularities.

When the suction wheel further rotates in the direction of the arrow, the suction hole 4
a moves upward and sucks up the next printed paper A, and also sucks up the printed papers A one after another, from B to C to D.
In this state, the printed sheets A can be sequentially stacked on the paper stacking table 37. In this way, the printing paper A sent from the printing mechanism is always sucked at a fixed position by the suction holes 4a, 4a, 4a, . The reason why the suction does not occur is because, as mentioned above, the suction wheel 3 is configured so that when the printing mechanism rotates once (this refers to one printing process in which printing is performed on printing paper), the suction wheel 3 also rotates once. .

This means that the sprocket 25 of the suction wheel drive mechanism shown in FIG. The sprocket 25 is also configured to rotate once, and the sprocket 12 is also pivoted on the suction axle 2.
Since the sprocket 25 and the sprocket 25 have the same diameter, the suction wheel also rotates once when the printing mechanism rotates once.

Furthermore, the grippers 32 attached to the chain 31 for conveying printing paper are arranged at equal intervals (in this embodiment,
On the other hand, the conveyance interval of the butt ends 35 of the printing paper A is also configured to match the interval of the grippers 32 (the butt ends 35 of the printing paper A are transferred every 850 mm of movement). ) has been
Furthermore, the suction wheel 3 also has suction holes 4 so that the butt end 35 of the printing paper A is always suctioned at a fixed position in the upper part.
b and the length of the suction groove 5, and the circumference of the suction wheel 3 (200 mm in this embodiment).
and the circumferential speed (which is slower than the transport speed of the printing paper A, and in this embodiment, the speed difference is 850 mm to 200 mm) are respectively set. Note that this deceleration may be mechanically driven by the printing mechanism using a chain, gears, or the like.

Further, the specific operation in this respect will be explained in detail with reference to FIG. 2A. Now, as shown in figure a, the printing paper B gripped by the gripper 33 passes over the suction wheel 3, and when the gripper end 35 comes to the position of the suction hole 4b of the suction wheel 3, the suction tube 6 Air (not shown)
The buttock 35 is sucked through the suction hole 4b and is attracted to the suction hole 4b, and at the same time, the printing paper B is released from the gripper 33 of the gripper 33. Next, since the suction wheel 3 continues to rotate at a constant speed,
As shown in figure b, the butt end 35 of the printing paper C is moved in the direction of the arrow while being attracted to the suction hole 4b. Further, when the paper moves as it is and reaches the state shown in Figure C, the air suction from the suction groove 5 stops, so the air from the suction hole 4b is not suctioned, and the butt end 35 of the printing paper D is moved to the suction hole 4b. You will be able to release it from Then, as shown in FIG. It will be piled up.

In this way, the suction hole 4b provided in the suction wheel 3 is a main part of the device according to the present invention,
By the suction of this suction hole 4b, the printing paper A becomes B,
When passing from C to D, it is possible to completely prevent the slip phenomenon during adsorption due to wobbling or misalignment of the butt end 35, and also to hold the printing paper A as horizontally as possible and place it on the paper stacking table 37. By dropping the paper, good paper alignment can be achieved.

3A and 3B show a printed paper suction device of a paper discharge mechanism according to a conventionally known technique. As is clear from this figure, the suction wheel 3 is provided with a large number of suction holes 4a all over its circumference;
By constantly rotating the printing paper A, the tip of the butt end 35 of the printing paper A is always rounded and attracted. Therefore, since the conveyance speed of the printing paper A and the rotational speed of the suction wheel 3 are different, when the printing paper A is released from the gripper 32, the outer peripheral speed of the suction wheel 3 is decelerated compared to the conveyance speed of the printing paper A. As a result, a slip phenomenon occurs between the printing paper A and the outer circumferential surface of the suction wheel 3, causing printing defects such as stains on the surface of the printing paper, which may cause the printed product to be damaged. is reducing its value.

Since the present invention is configured as described above,
It has the following effects.

A. The long rear part of the printing paper sent from the printing mechanism is sucked by the suction wheel, so that it can be dropped onto the paper stacking table almost horizontally with the front part of the printing paper. As a result, paper alignment can be performed better than before.

(b) Since the suction hole is configured to suck the butt end of the printing paper for as long as possible, it is possible to completely prevent the slip phenomenon caused by wobbling or shifting of the butt end, which conventionally occurs.

C) One printing process of the printing mechanism and one rotation of the printing wheel are made to rotate simultaneously, and the end portion of the printing paper fed from the printing mechanism is sequentially sucked and dropped onto the paper stacking table, so it is different from the conventional method. In this way, it is possible to completely prevent the current slippage caused by the misalignment between the printing speed and the suction speed.

D. This device, which has the above-mentioned specific effects, can achieve good paper alignment even when printing on the back side of a sheet-fed printing press for double-sided printing, which has traditionally been considered difficult or impossible.

[Brief explanation of the drawing]

Fig. 1 is an explanatory schematic diagram of the printed paper suction device of the paper discharge mechanism in the sheet-fed printing press of the present invention, A and B are enlarged views of the main parts, and C is the paper discharge using the present device. An overall view of the mechanism, FIG. 2 is a partially enlarged explanatory view showing the operation, functions, etc. of this device, and FIG. 3 is an explanatory schematic diagram of a suction device according to a conventionally known technique. 1...Printed paper suction device, 2...Suction axle, 3...
...Suction wheel, 4a.4b...Suction hole, 5...Suction groove,
6... Suction pipe, 7... Air hose, 8... Suction wheel holder, 9... Suction wheel frame stand, 10...
...Bolt, 11...Key, 12.24.25.2
6.27.28.29... Sprocket, 13...
...Suction wheel frame, 14...Rear paper alignment plate, 15
...Paper alignment plate fixing angle, 16...Suction wheel moving device, 17...Suction wheel moving axis, 18.19.2
0.21...Gear, 22.22'...Rack, 2
3... Drive shaft, 30... Rack guide, 31... Chain, 32... Gripper, 33... Biting part, 3
4...Chain guide rail, 35...Butt end, 3
6...paper allowance, 37...paper stacking stand.

Claims (1)

[Scope of utility model registration request] A sheet-fed printing machine consisting of a printing paper suction mechanism that rotates a suction wheel to attract the end of the printing paper to an air suction hole, and a suction wheel movement mechanism that allows the suction wheel to be positioned and moved from side to side. In the paper ejecting mechanism, the suction wheel has an air suction hole formed of at least six to eight small holes arranged at equal intervals on the approximately semicircular surface of the suction wheel, and a printing paper sheet at the end of the air suction hole. A suction wheel consisting of an air suction groove that allows the butt end to be moved while being attracted to a certain position is provided, and one rotation of the suction wheel and one printing process of the printing paper are made to rotate simultaneously. Printed paper suction device of the paper ejection mechanism in a sheet-fed printing press.