JPS5820865B2 - Sheet-fed printing press discharge device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a paper discharge device for a sheet-fed printing press.

A sheet discharge device of a sheet-fed printing press has a configuration 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 the machine frame of the printing press, 12 is a delivery chain, 14 is a gripping claw for sheets 1 and 6 installed at equal intervals on the chain, 18 is a suction wheel, and 20 is a stack of sheets. 22 is a suspension chain for the board, 24 is a sprocket wheel for driving the chain, and 26 is a weight.

After the sheet 16 passes through the printing unit (not shown) on the right side of FIG. 2 and is printed on both sides or one side, the leading end is held in the gripping claw 14 of the delivery chain, and the sheet 16 is sequentially moved upwards of the board 20 at high speed. If you bring it in, it will be taken away.

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 below 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 pad is usually formed of a plate, a comb-like needle, etc., and consists of a front pad 28, a rear pad 30, and left and right lateral levers 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 does not cause show-through is stacked on a certain nail 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 was 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 while being subjected to the effects of 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 is raised to bring the block 36 into contact with the original 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 released and lowered as the board 20 gradually descends, and returns to the position shown in Figure A. The next plate installation work will have to wait until this condition is reached.

By the way, the above-mentioned method of interposing the plate 34 has the following drawbacks.

That is, as shown in FIG. 3B, the sheets 16 continue to fall even while the plate 34 is being inserted, so they are caught on the tip of the plate and damaged. .

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

Immediately after the board 20 was suddenly lowered to change the state from Figure A to Figure B, the stack of sheets under the newly inserted board hit 28, 3.
0.32, the sheets 16 would pile up in random directions until the new board was installed, and in order to prevent this from happening manually, two or three people were required to do so. It is necessary.

As a means to prevent such drawbacks, a paper ejecting device as disclosed in, for example, Japanese Patent Laid-Open No. 131709/1983 has been proposed.

This method uses a suction member to suction the leading and trailing edges of a single sheet at several points during interposition work between boards and blocks, and then holds subsequent sheets on top of the suction member. This is an attempt to cut off the flow of paper.

However, this device has the disadvantage that the holding force for sheets is small, so even when the board and block are interposed, the paper cannot be supported due to the weight of the paper piled on top of it, and the paper falls down.
Moreover, this drawback is further exacerbated by the fact that powder, etc., which are sprayed to prevent show-through, clog the suction section, resulting in an extremely low suction force.

The present invention has been made in order to eliminate the drawbacks of the conventional methods as described above, and it prevents damage and damage to sheets during board interposition work, and also prevents sheets from being subject to direction control. This is an attempt to eliminate the occurrence.

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 from behind the rear pad 30 to face the front pad 28.

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 gap in the rear piece, or if there is no gap, then bored in the rear piece and opposite to those holes.

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 interior is interconnected.

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

Further, 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, prevent separation of the cylinders, or drive movement between the cylinders. An annular protrusion 52 and a cylindrical protrusion 54 are formed to facilitate this.

The cylindrical protrusion 54 is formed to have a wide width, is provided on the outer periphery of the rear end of the movable cylinder of each telescopic body, and is in airtight contact with the inner surface of the adjacent cylinder.

The annular protrusion 52 is provided at the front end of the cylinder and is engageable with the cylindrical protrusion.

The pipe 44 serves as a support for the telescopic body and at the same time serves as a means for injecting and exhausting air into the cavity of the telescopic body to cause the telescopic body to expand and contract.

The number of telescopic bodies to be installed is determined in consideration of the maximum width of the paper as described above, but when the paper is small, there is no need to operate the telescopic bodies on both sides.

Therefore, the pipe 44 is provided with an on-off valve as shown in FIGS. 4 to 6.

In the figure, 56 is a sliding valve, 58 is a screw fixed to the valve, 60 is a wing nut, and 62 is a slot provided in the pipe. When operating the telescopic bodies on both sides, the valve 56 is moved to the position indicated by the solid line. Turn it to communicate with the pipe, and when you want to stop it, turn it to the chain line position to disconnect it from the pipe.
It can be fixed by turning a nut 60.

A pump for supplying or discharging air and, if necessary, a pressure accumulator (not shown) are connected to the pipe 44 via tubes for supplying or discharging air (not shown).

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.

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 of the rear pad 30 toward the front pad 28 at a very high speed, thereby 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 pink body will damage the sheet due to the interposition of the plate 34.

In this way, the succeeding sheets are supported by the fully extended telescopic body and stacked neatly on top of it under the action of the pads 28, 30, 32, and during this time the board 20 is lowered, as shown in FIG. Interposition work between the plate 34 and the block 36 as shown in C is performed.

After this operation is completed, the suction valve is opened, the telescopic body is retracted, and the succeeding paper is allowed to fall onto the newly installed plate.

Even at this time, 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.
It gradually descends with the normal descent of 0.

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

Further, the above-mentioned work of interposing the board etc. is carried out not only when the paper on the board becomes full, but also when the pallet is replaced when the stack of papers becomes full. It can also be applied in such cases.

As described above, the present invention is constructed by installing a telescopic body from the rear of the back piece facing the front piece. Therefore, when inserting plates and blocks, the telescopic body can be installed instantaneously or in an emergency. By projecting the paper at a high speed, it is possible to cut off the downward fall of the following paper.

Therefore, it completely prevents the damage and breakage of sheets that conventionally occurred, prevents the occurrence of sheets that are lost due to the action of the padding, and achieves labor savings by eliminating the need for paper aligners. It is possible.

Further, in the present invention, since the supporting member for the succeeding paper is constituted by a telescopic member, which is itself expandable and retractable, it can be installed without difficulty even in the delivery section of a printing press where space is limited, as shown in FIG.

Furthermore, since the pushing motion of the telescopic body is performed by injecting compressed air, even when used with rotary presses, which have been gradually increasing in speed in recent years, the pushing motion can be completed faster than the paper discharge speed. Moreover, since the contraction operation is performed by exhaust gas, it can be driven without requiring any complicated mechanism.

Furthermore, since the telescopic body itself is deformable and is driven by air, even if an excessive force is applied to the telescopic body for some reason, there is no risk of damage to the drive system or the opposing object.

Furthermore, a wide cylindrical protrusion is provided on the outer periphery of the rear end of the movable tube of the telescopic body so that it can come into airtight contact with the inner surface of the adjacent tube, thereby preventing the tubes from separating when the telescopic body is extended. Not only can this be prevented, but it can also prevent the telescopic body from suddenly bending when a sheet of paper is placed on top of it, thereby preventing the paper from falling.

[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 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 V-V 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 of paper, 20...
・Disc, 22...Chain, 24...
...Sprocket wheel, 28...
・・・Front cover, 30・・・・・・Back cover, 32...
・・・・・・lateral force, 34・・・・・・・・・board, 3
6・・・・・・・・・Block, 38・・・・・・・・・
・Guide rail, 40...Telescopic body, 44...Pipe.

Claims (1)

[Claims] 1. A paper discharge device for a sheet-fed printing press comprising the following items. a. A telescopic body that is installed from the back of the sheet facing the front of the sheet and has a plurality of internal parts connected to each other. b A wide cylindrical protrusion provided on the outer periphery of the rear end of the movable tube of each telescopic body and in airtight contact with the inner surface of the adjacent tube. C. An annular protrusion that can engage with the cylindrical protrusion provided at the front end of the cylinder of each telescopic body. d means for injecting air into the telescopic body in order to cause the telescopic body to perform a pushing action before inserting a sheet-supporting plate immediately below the rear and front supports; e means for exhausting air from the telescopic body in order to cause the telescopic body to retract after the plate is inserted;