JPS5918297B2 - Sheet-fed printing press discharge device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper discharge device in a sheet-fed printing press.

In sheet-fed printing machines, the printed paper is conveyed to a predetermined position by several grippers connected to a chain and aligned, but due to the high printing speed, paper stacking It is not possible to properly place the printed paper on top of the paper, and for this reason, a suction wheel equipped with an air suction device is installed to suction and stack the printed paper being conveyed.

However, although this method is good for single-sided printing, in sheet-fed printing machines for double-sided printing, the ink does not dry between the time printing on the back side is completed and the printed paper is transported and stacked, so the ink is not dried during suction. The discrepancy between the speed of the printing paper and the outer circumferential speed of the suction wheel causes a slip phenomenon, resulting in failure to produce good prints and many missing prints, which also causes economic problems. The present invention has been newly developed to solve the above-mentioned problems, and includes a suction wheel with a sprocket consisting of one suction hole, and the rotation of the suction wheel constantly removes printing paper from the suction hole. A printing paper suction mechanism that attracts the butt part of the paper, an upper rack that has two sprockets arranged side by side and allows each sprocket to rotate the chain via two sets of upper and lower sprockets, and a chain that meshes with the sprocket of the suction wheel. In addition to fixing the suction wheel, a lower rack is provided to freely position the suction hole, and the suction wheel can be moved from side to side via the upper and lower rack gears to freely position the suction wheel. To provide a paper ejecting device for a sheet-fed printing press that is capable of performing good double-sided printing without causing any problems.
An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of the entire mechanism of the sheet-fed printing press of the present invention.
This machine consists of a paper feeding mechanism A, a printing mechanism B, and a paper ejecting mechanism C.

This printing mechanism B is already a printing mechanism based on a conventionally known technology. Portion C in this figure is the paper ejecting device of the present invention.
In other words, the printing mechanism BK conveys the printed paper by gripping it with grippers attached to a chain at equal intervals, and stacking the printed paper one after another on a predetermined paper stacking table by attracting the butt end of the paper. It is a mechanism. FIG. 2 shows the paper ejecting mechanism C of the apparatus of the present invention shown in FIG.

1 in the figure is a printed paper suction mechanism, which constitutes a main part of the apparatus of the present invention. This printed paper suction mechanism 1 has a suction wheel 3 equipped with one suction hole 4 on a suction axle 2, as shown in the drawing. connected. 5 is a suction wheel holder;
It is attached to the suction wheel frame stand 8, and the bolt 10
It's tightened.

9 is a suction wheel stop plate for fixing the suction wheel 3 to the suction wheel holder 5.

12 is a sprocket which rotates the suction wheel 3 and keeps the suction hole 4 at a constant position (point P) when the printing paper 40 is removed from the gripper 38.

That is, by making the driving rotation of the printing press and the rotation of the suction wheel the same (the number of gears on the sprocket 12 and the sprocket 25 are the same), the buttock portion 41 is always attracted to the suction hole 4. For example, the position of point P is constant. 11 is a key for the suction axle 2; 13 is a suction wheel movement guide; 14
is the suction car frame.

Note that 15 is a paper alignment plate stop angle, and 16 is a rear paper alignment plate. Next, Figures C and 2 show the apparatus of the printing paper suction mechanism 1 shown in Figures A and 2 above, as well as its movement and rotation mechanism, and 17 is its suction wheel moving mechanism.

Further, to explain the operation of the device of the present invention in detail, first, the printing paper 40 is conveyed by the gripper 38, passes over the suction wheel 3, and at the moment when the buttock portion 41 passes through, the suction hole 4 is positioned directly above. (Point P) is reached.

At this time, the buttock part 41 is sucked. The position (point P) is determined so that the gripper 38 releases the printing paper at the same time as this suction. In other words, since the distance between each gripper 38 is set to be the same as the printing rotation speed (rotation of each cylinder) once in the printing mechanism B, the gripper 38 releases the printing paper 40 and at the same time the butt part 41 is It is possible to suction through the suction hole 4, and it is also possible to continuously suction only the buttock part 41, which is a constant part. The adsorption angle is shown in Figure A.
, P' points. The suction position for the printing paper 40 can be arbitrarily set by installing a timing adjustment coupling between the sprocket 12 attached to the suction axle 2 and the suction wheel 3. Note that air for adsorption is constantly sucked in by a normal air hop (not shown). Next, regarding the rotation of the suction wheel 3 and the method of moving it in the left and right directions, when the drive shaft 24 is rotated in the direction of the arrow,
Chain 31 connects each sprocket 25, 26, 27, 28
, 29, 30, the pin 3 fixed to the frame 36
The sprocket 12 is moved in the direction of the arrow along the chain guide rail 35 fixed to the chain 31, and the sprocket 12, which has the same number of teeth as the sprocket 25, is rotated. As a result, the suction axle 2 rotates, and the direction of rotation is fixed by the key 11. By rotating the drive shaft 24 in this manner, the rotation of the suction wheel 3 becomes the same rotation as one printing rotation of the printing mechanism B. Furthermore, in order to move the suction wheel 3 from side to side, the suction wheel moving shaft 18 fixed to the gear 19 is rotated, and the suction wheel moving guide 13 is fixed to the suction wheel frame 14 on which it is guided. Move the rack 32. The printing paper suction mechanism 1 is designed to move this rack 32.
The whole can be moved freely left and right. Also, the rack guide 33 is connected to the rack 2 via the gears 20, 21, 22.
3 moves, the sprockets 27 and 28 move in the direction of the arrow. Due to this movement, the part of the chain 31 between the sprockets 27, 28, 29, and 30 moves,
Further, as the suction wheel 3 moves, the chain 31 is also moved simultaneously, so that the sprocket 12 can be moved while remaining stationary. Therefore, printing paper 4
When positioning the suction hole 4 (point P) by adjusting the size of the suction hole 4, operate the gear 19 and move the rack 32 left and right.The rack 23 will also be moved left and right via the sprockets 27 and 28. Therefore, point P can be at any position. As a result, from the bite part 39 of the printing paper 40 to the butt part 4
Even if the size up to 1 changes, the timing at which the suction wheel 3 sucks the printing paper 40 does not change, so the same paper alignment effect can always be achieved for the printing paper 40 of any size. FIG. 3 shows a paper ejecting device according to a conventionally known technique.

It is clear from this figure that the suction wheel 3 has several suction holes 4.
At the tip of the suction tube 6, there is also a suction tube 6' that communicates with each suction hole 4. This is a paper ejecting device that constantly rotates a suction wheel 3 and constantly suctions the printed paper 40 from each suction hole 4. Since the conveyance speed of the printing paper 40 and the rotational speed of the suction wheel 3 are different, when the printing paper 40 is released from the grippers 38, the conveyance speed of the printing paper 40 also differs from the outer peripheral speed of the suction wheel 3. The speed must be reduced to align the paper, and this causes a slip phenomenon between the printing paper 40 and the outer circumferential surface of the suction wheel 3, causing printing problems such as stains on the printing paper surface printed on the back side, and causing print problems. It reduces the product value. In particular, if there is a pattern printed on the back side, it will not be possible to produce a good quality print.
The suction wheel 3 had to be moved to a portion (not shown) for printing, which caused many problems in terms of work efficiency. Furthermore, the features of the conventionally known device shown in this figure include: 1. The rotation of the suction wheel 3 is completely arbitrary; 2. The point and position at which the suction wheel 3 sucks the printed paper 40 is always fixed; 3. In this case, several white areas are required, and if the position changes, the suction wheel 3 must also move accordingly. There is only one suction hole 4 in No. 3, and
The rotation is also always once per printing rotation. 2 Gritspa 38. ! ．． The timing at which the suction wheel 3 releases the printing paper 40 and the timing (instantaneous and position) at which the suction wheel 3 sucks the printing paper 40 are always constant regardless of the size of the printing paper 40.

3. Printing on the back side can be done if there is a small white area on the butt end 41 of the printing paper 40.

The four suction wheels 3 have the characteristics that the printing paper 40 is held at a constant angle and are sucked, and the timing at which the printing paper 40 is sucked does not change even if the five suction wheels 3 are moved.

Since the present invention is configured as described above, not only can printing on the back side, which was considered impossible and difficult with conventional sheet-fed printing machines for double-sided printing, be possible, but also the paper alignment effect can be improved.
Furthermore, since the device is not only simple but also easy to operate, it can be said to be a paper discharge device for a sheet-fed printing press that can be put to practical use in terms of performance, economy, etc.

[Brief explanation of drawings]

FIG. 1 is an overall mechanical diagram of the sheet-fed printing press of the present invention, and FIG. 2 is an enlarged explanatory diagram of the main parts of the paper discharge device of the present invention shown in FIG.
and FIG. 3 is an explanatory schematic diagram of a paper ejecting device according to a conventionally known technique. 1...Printed paper suction mechanism, 2...Suction axle, 3...Suction wheel, 4...Suction hole, 5
...Suction wheel holder, 6...Suction tube,
7... Air hose, 8... Suction wheel frame stand, 9... Suction wheel stop plate, 10...
...Bolt, 11...Key, 12,25,2
6, 27, 28, 29, 30... Sprocket, 13... Suction wheel movement guide, 14...
・Suction wheel frame, 15... Paper alignment plate stop angle, 16... Rear paper alignment plate, 17...
・Suction wheel movement mechanism, 18... Suction wheel movement axis, 1
9, 20, 21, 22... Gear 23, 32.
...Rack, 24...Drive shaft, 31...
...Chain, 33...Easy guide, 34
...Easy pressing board, 35...Chain guide rail, 36...Frame, 37...
...Pin, 38...Gritzpa one, 39...
...Bite, 40...Printed paper, 41...
・Butt part, 42...Paper rest, 43...Paper stacking stand.

Claims (1)

[Claims] 1. A suction wheel with a sprocket consisting of one suction hole is provided, and a printing paper suction mechanism that constantly sucks the butt end of the printing paper from the suction hole by rotation of the suction wheel, and two sprockets are arranged side by side, and each An upper rack for rotating a chain through two sets of upper and lower sprockets, and a lower rack for fixing the suction wheel by engaging the chain with the sprocket of the suction wheel, and for freely positioning the suction hole, A sheet discharge device for a sheet-fed printing press comprising a suction wheel moving mechanism that moves the upper and lower racks laterally through gears to freely position the suction wheel.