JPS5827188B2 - Driving method for sheet-fed printing press paper ejection device - Google Patents

Description

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

The paper ejecting device of a sheet-fed printing press has become the authority as shown in FIGS. 1 and 2.

Although some parts differ depending on the model and manufacturer, the principle is the same.

In the figure, 10 is a machine frame of a printing press, 12 is a delivery chain, 14 is a gripping claw for sheet sheets 16 installed at equal intervals on the chain, 18 is a suction wheel, 20 is a sheet stacker, 22 is a suspension chain for the board, 24 is a sprocket wheel for driving the chain, and 26 is a weight.

After the sheets 16 are printed on both sides or one side through the printing unit (not shown) on the right side of FIG. If you bring it, it will be done.

Further, the rear end of the sheet 16 is held by the action of a suction wheel 18.

Therefore, the sheet is kept horizontal directly above the board 20.

Immediately thereafter, the sheet 16 is released by the opening action of the claw 14 and detached from the suction wheel 18, and is allowed to fall onto the board.

Further, various types of guards are installed on the paper ejecting device to prevent the sheets 16 from falling and to neatly pile them up on the board.

The pads are usually formed of plates, comb-like needles, etc., and include a front pad 28, a pad 30, and left and right pads 32 in the direction of paper travel.

By these means, the delivery chain 12 and the board 20
A rectangular tube-like sheet path is formed between the two.

By the way, as far as the sheet 16 is concerned about show-through,
The sheets are not piled up on the board, but as shown, another board 34 and a block 36 supporting the board are interposed between the piles of sheets.

Considering the amount of ink, pattern area, paper quality, etc., if it does not appear to show through, it will be stacked.

However, in high-quality printing, stacking can usually be avoided.

In order to perform the intervening work of the plate 34 and the block 36 and the replacement work of the paper discharge pallet, the paper discharge device is provided with a guide rail 38 for the above-mentioned plate, and the chain 22 and the board 20 are connected in a normal continuous or intermittent manner. A drive device (not shown) is provided for lowering or stopping at a faster rate than the lowering speed.

Here, the procedure for this intervening work will be explained based on FIG. 3.

Assume that the maximum amount of sheets 16 that do not cause show-through are stacked on a board 34 as shown in Figure A.

Then, the operator operates a switch on the high-speed drive device, and the plate 34 is moved along with the panel 20 to the 2nd position shown in Figure B.
8, 30. It will be lowered an appropriate distance below 32.

Immediately after being lowered, another plate 34 is quickly inserted into the guide rail 38 by about two people.

Subsequent falling papers will be piled up on this plate under the action of the pads 28, 30, 32.

In the meantime, the worker places blocks on the four corners of the previous sheet, as shown in Figure C, and then operates the switch to move the board 2.
0 to bring the block 36 into contact with the following in the guide rail.

Thereafter, the guide rail 38 is removed by the operator (from the chain line position in Figure 1 to the solid line position), and the newly installed plate 34 is lowered as the released board 20 gradually descends, and is again moved to the position shown in Figure A. The interposition work for the next board will have to wait until this condition is reached.

By the way, the above-mentioned method of interposing the plate 34 has a serious defect.

This is because, as shown in FIG. 3B, the sheets 16 continue to fall while the plate 34 is interposed.

In other words, the sheet gets caught on the tip of the board and gets damaged.

Since the sheets 16 will be damaged each time the plate 34 is inserted, the cumulative amount of damage will be enormous.

There are also other deficiencies.

In other words, immediately after the board 20 is suddenly lowered to change from the state shown in Figure A to the state shown in Figure B, the stack of sheets under the newly inserted board 28
Since it is outside the regulation range of 30.32 degrees, the sheets 16 will be piled up in random directions until the new board is inserted.

It takes two or three people to manually prevent this from happening.

The present invention has been made to eliminate the above-mentioned defects of the conventional method, and by temporarily receiving sheets before and after inserting the board by expanding and contracting the telescopic body, it is possible to easily receive sheets during the inserting operation of the board. The objective is to prevent the sheets from being damaged or damaged, and to eliminate the occurrence of sheets that are no longer subject to direction control, thereby smoothing the expansion and contraction operations of the telescopic body.

Hereinafter, one embodiment of the present invention will be explained based on the drawings.

As shown in FIGS. 1 and 2, in the present invention, a telescopic body 40 is provided opposite the front cover 28 from behind the rear 30.

This telescopic body 40 is intended to hold sheets that would normally not be affected by the above-mentioned support until the interposition of the sheets is completed.

As shown in FIG. 4, a plurality of telescopic bodies 40 are installed horizontally at predetermined intervals.

The number of sheets to be installed and the spacing are determined by taking into consideration the maximum paper size that can be handled by the printing machine, the number of sheets that can be received at one time, etc.

Further, the telescopic body is provided opposite to the rear gap, or if the gap is shortened, the telescopic body is provided opposite to those holes by drilling holes at the rear.

Each telescopic body 40 has a structure as shown in FIGS. 5 and 6, the rear end of the outermost tube 42 is connected to a pipe 44, and the tip of the innermost tube 46 is sealed with a plate 48. .

The pipe 44 is fixed to an appropriate location on the machine frame 10 or the like.

In addition, the front and rear ends of the intermediate cylinder 50, the front end of the outermost cylinder 42, and the rear end of the innermost cylinder 46 are designed to maintain airtightness in all cavities and prevent the cylinders from separating from each other, or prevent the cylinders from sliding together. Annular projections 52, 54 are respectively formed to facilitate movement.

The pipe 44 serves as a support for the telescopic body and at the same time serves as a means for injecting air into the cavity of the telescopic body to cause the telescopic body to perform an extension movement.

A pump for air injection and, if necessary, a pressure accumulator (not shown) are connected to the pipe 44 via an air cylinder tube (not shown) for air injection.

The tube is also provided with a solenoid valve (not shown).

Note that the telescopic body 40 is not limited to the cylindrical shape as shown in the drawings, but may also have a rectangular, flat, or semi-cylindrical shape in order to more easily receive paper.

Further, the valve 56 is not limited to a manual type, but may also be an automatic type such as a solenoid valve provided in the tube.

On the other hand, the telescopic body 40 is retracted by winding a string 56 connected to the innermost tube 46 with a motor M, as shown in FIG. 4.5.6.

The string 56 passes through a small hole 58 provided in the pipe 44, reaches a reel 60, etc., and is wound on the reel by a motor drive.

In this case, compressed air leaks from the small holes 58, but only to an extent that does not impede the extension movement of the telescopic body 40.

Next, the operation of the present invention will be explained using FIGS. 3 and 7. First, when the state shown in FIG. The solenoid valve is then remotely controlled to instantaneously inject compressed air into the telescopic body.

Then, as shown in FIG. 7, the telescopic body 40 protrudes from the rear 30 toward the front support 28 at a very high speed, preventing the occurrence of the situation as shown in FIG. 3B.

According to experiments conducted by the present inventors, it has been confirmed that the stretching motion of the telescopic body is considerably faster than the ejection speed of the sheet 16 even at a printing speed of 10,000 sheets/hour.

Therefore, there is no possibility that the telescopic body will damage the sheet due to the interposition of the plate 34.

In this way, subsequent sheets are supported by the fully extended telespic body and stacked neatly on top of it under the action of the pads 28, 30, 32, during which time the board 20 is lowered to the position shown in FIG. 3C. The interposition work of the board 34 and flock 36 is performed as follows.

After this work is completed, the string 56 is wound up by the motor M, thereby contracting the telescopic body and causing the following paper to fall onto the newly inserted board.

At this time as well, the sheets are stacked without any disturbance because they are under the action of the support.

After that, the guide rail 38 is removed and the new board is installed on board 2.
00 It gradually descends as it descends normally.

The electromagnetic valve that causes the telescopic body 40 to extend can also be linked to a device that detects the height of the stack of sheets or a switch that causes the board 20 to descend suddenly.

In addition, the above-mentioned interposition work such as boards is performed not only when the stack of paper is full, but also when the pallet is replaced when the stack of paper is full, and the present invention is applicable to such cases. It can also be applied to

Now, as described above, the present invention has a telescopic body installed facing the front cover from the rear, so when inserting plates and blocks, the telescopic body can be installed instantaneously or in an emergency. By projecting the sheet at a high speed, it is possible to cut off the fall of the following sheet F from below.

Therefore, it completely prevents the sheets from being damaged and damaged, which conventionally occurred, and also completely prevents sheets from becoming unaffected by the padding, and also saves labor by eliminating the need for paper aligners. It can be achieved.

Further, in the present invention, the pushing action of the telescopic body is performed using compressed air, and the retracting action is performed by winding a string.

For this reason, it goes without saying that the pushing action of the telescopic body can be performed extremely quickly, but if vacuum suction is used during the contraction operation, malfunctions may occur due to air leakage from the joints between the cylinders of the telescopic body or increased friction due to bending. We have solved the problems that tend to occur,
The contraction operation can be completed.

[Brief explanation of drawings]

FIG. 1 is a front view of a paper discharge device to which the present invention is applied, and FIG. 2 is a side view. FIG. 3 is a process explanatory diagram of a conventional filter plate interposition work. FIG. 4 is a perspective view of essential parts of the present invention. FIG. 5 is a sectional view taken along the line VV in FIG. 4. FIG. 6 is a similar sectional view of the device shown in FIG. 5 during operation. FIG. 7 is an explanatory diagram of the operation of the present invention corresponding to FIG. 3A. 16... Sheet, 20... Board, 22... Chain, 24... Sprocket wheel, 28... Front contact, 30... Rear, 32... Contact, 34 ...Plate, 36...Flock, 38...Guide rail, 40
...Telescopic body-44...Pipe, 56...
- String, 58...small hole, M...motor.

Claims (1)

[Claims] 1. A method for driving a sheet discharge device of a sheet-fed printing press, which comprises the following items. a. A pipe for supplying compressed air is provided in the telescopic body which is provided facing the front cover from the back of the sheet contact b. A string is connected to the innermost tube of the telescopic body to connect the telescopic body d) The above-mentioned compressed air must be supplied to extend the telescopic body before the intervening work of the board or pallet. d The telescopic body must be extended before the intervening work of the board or pallet. To make the telescopic body retract by winding up the edges.