JPH09188461A - Paper discharge device of paper sheet printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of collision of a pallet against a sheet guide and its deviation by providing an upper limit position detection means, a temporary stop position detection means, and a position correction means of the pallet in a paper discharge device. SOLUTION: The pallet position detection and correction operations are done by signals of a controller 7. A paper discharge table 6 is at the lowest descent position and a pallet 1 is put on it. The pallet 1 is detected by a pallet sensor 4 as the paper discharge table 6 rises, and is stopped at the position temporarily. Press members 12a, 12b of air cylinders 5a, 5b move the pallet 1 to the right and left by a specified amount and correct it. Consequently, the pallet 1 is set at the objective position without deviating from it. After that, the pallet 1 is retracted to the initial position and is raised again so that the table 6 is stopped by a signal detected by an upper limit sensor 2. Accordingly, the set position of the pallet 1 is determined, and sheet which is dropped and charged is piled up accurately without deviation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet discharging apparatus provided with a sheet pallet position correcting device in a sheet-fed printing press.

[0002]

2. Description of the Related Art FIG. 3 shows a schematic structure of a general sheet-fed printing press. The sheet-fed printing press has a sheet feeding device 15,
The printers 16a to 16n, a paper discharge device 17, a sheet stacking device 18 attached to the paper discharge device 17, and the like.

In such a sheet-fed printing press, the sheets (sheets) 14 stacked on the sheet feeding table 19 of the sheet feeding device 15 are sequentially sent out one by one from the uppermost stage, and the next step is carried out. After predetermined printing is performed in the printing devices 16a to 16n, the leading end is gripped and conveyed to the paper discharge device 17 via the chain gripper 13 attached to the endless chain 20 which is a sheet conveying means, and the sheet is ejected to the above-mentioned chain. By being released from the gripper 13, the sheets are dropped and stacked on the pallet 1 placed on the discharge table 6 of the stacking device 18.

The sheet discharge table 6 is constructed so as to be lifted and lowered by a pile lifting device. A pallet 1 is placed on the upper surface in preparation for stacking discharged sheets, and the upper surface of the pallet 1 is predetermined. The sheet 14 is lifted up to the height of 1 and is made to stand by, and in this state, the sheets 14 sequentially falling as described above are received and stacked on the upper surface thereof.

The discharge table 6 is controlled so as to descend in accordance with the height of the stacked sheets so that the displacement of the height of the uppermost surface due to the stacking of the sheets falls within a certain range. This allows
The upper surface position of the stacking sheets 14 is always maintained at a constant height, which forms an optimum head with respect to the sheets 14 that fall subsequently and enables stable stacking. When the sheets 14 stacked on the pallet 1 reach a predetermined height, a non-stop device (not shown) or the like is operated to lower the discharge table 6 to the lowest position. Subsequently, the stacked sheets 14 are carried out to the outside together with the pallet 1, and the next empty pallet 1 is placed on the pallet 1, and the sheet 14 is raised again to a predetermined position for setting.

In addition to the sheet-fed printing machine shown in FIG. 3, two sets of sheet stacking devices 18a and 18b are installed, and a predetermined number of sheets are stacked on the pallet 1 on one side 18a of the sheet stacking device. Along with this, a sheet-fed printing machine is also provided which is configured to switch the sheet stacking setting to the sheet stacking device 18b on the other side and eliminate the stoppage of the printing machine due to the replacement and replacement of the pallet 1.

In such a sheet-fed printing press, the sheet 14 for which printing has been completed is carried out to the outside by the above-mentioned operation, and the next pallet 1 is set to perform intermittent or continuous printing. Therefore, shortening the pallet 1 exchange time greatly affects the productivity of printed matter. Further, the positional displacement of the pallet 1 on the discharge table 6 causes a problem in sheet resetting and also causes deformation of the sheet 14 that is dropped and thrown in, which is great for maintaining the quality of the printed product. Influence.

FIG. 4 is an explanatory view of a conventional pallet moving method in the sheet-fed printing press. In FIG. 4, when the pallet 1 is raised to set the initial height when preparing for the sheet stacking work, the discharge table 6 is lowered to the lowest position via the pile lifting device, Place the pallet 1 on 6 and raise it.

At this time, when the pallet 1 is placed on the discharge table 6 with the top and bottom shifted, the pallet 1
However, it cannot collide with the lower end of the front side sheet guide 3a or the rear side sheet guide 3b set at a predetermined position and cannot be raised to a predetermined height, or the seat guide 3 is deformed by a forcible raising operation, Problems such as damage may occur.

As means for coping with such a defect,
Conventionally, as shown in FIG. 4, a pallet guide 22 having an inclined portion is attached to a frame 21 so that the pallet 1 rises and the pallet 1 moves inward (right side in the figure) along the inclined portion of the pallet guide 22. Thus, the collision with the lower end of the sheet guide 3a can be avoided. The pallet guides 22 may be arranged on both sides of the sheet 14.

[0011]

In the conventional pallet position correcting means as shown in FIG. 4, the frame 21 is used.
Since the pallet 1 is forcibly moved by the pallet guide 22 fixed to the pallet guide 22, frictional resistance between the lower surface of the pallet 1 and the upper surface of the discharge table 6 or the pallet guide 22.
The sliding resistance of the end portion of the pallet 1 with respect to was increased, and smooth and stable movement correction of the pallet 1 was difficult.

If the end of the pallet 1 is damaged, or if the top plate 1a is displaced from the pedestal 1b as shown in FIG. I couldn't push it. Further, when the discharge table 6 is lifted while the pallet 1 is displaced from the predetermined position, it collides with the lower end of the sheet guide 3, or if the lower part of the pallet is damaged, the pallet falls over, etc. Is likely to occur. On the other hand, in order to prevent the occurrence of such a defect, the driver needs to constantly monitor, which is an obstacle to labor saving.

An object of the present invention is to automatically stop the pallet at a desired position so that the sheet can be received, so that the pallet collides with peripheral equipment such as a sheet guide or the pallet on the discharge table. An object of the present invention is to provide a sheet discharge device of a sheet-fed printing press that can save labor by preventing a problem such as misalignment and automating a pallet moving operation.

[0014]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and the gist of the means is to drop and stack sheets on a pallet placed on a discharge table that can be vertically moved up and down. In a sheet-fed printing press equipped with a sheet stacking device, the upper limit position detecting means for detecting the upper limit position of the pallet and the position of the pallet on the way up and down to detect the position of the pallet in the middle of rising. A temporary stop position detecting means for temporarily stopping the pallet at a predetermined position, and a pallet position correcting means for engaging the pallet stopped by a detection signal from the temporary stop position detecting means and moving the pallet to a predetermined position. A sheet discharging device for a sheet-fed printing press, comprising: the upper limit position detecting means, the temporary stop position detecting means, and a control device for controlling the pallet position correcting means.

According to the above means, after the paper discharge table of the pile elevating device is lowered to the lowest position to load and place the pallet, the stop position detection means is used once while the pallet and the paper discharge table are being raised. In response to the pallet position detection signal, the pallet and the paper discharge table are temporarily stopped immediately before the sheet guide section, and the pallet position moving means corrects the pallet on the paper discharge table by moving it to a predetermined position.

After the position is corrected, the pile elevating device is driven again to raise the discharge table and the pallet, and this is stopped by the detection signal of the pallet upper limit position detecting means, and the next step is waited. By the above operation, the pallet is
Since the sheet can be correctly positioned at the predetermined position to receive the sheet, it is possible to avoid the problem that the pallet collides with other equipment such as the sheet guide and is deformed or damaged.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram of a sheet pallet position correcting device in a sheet-fed printing press according to an embodiment of the present invention, and FIG. 2 is a flowchart of a pallet position correcting operation.

In FIG. 1, 6 is a sheet discharge table, 1 is a pallet placed on the sheet discharge table 6, and 3a and 3b are sheet guides. 2 is an upper limit sensor for detecting the upper limit position of the pallet 1 and 4 is the sheet guides 3a, 3b.
The pallet sensors 5a, 5b for detecting the position of the pallet 1 which is in the process of rising near the lower end of the sheet guide 3 are
It is arranged close to the lower ends of a and 3b and on the top and bottom sides of the pallet 1 (front and rear in the sheet advancing direction), and the pressing member 12a is provided at the tip.
The pair of air cylinders 7 provided with the upper and lower sensors 2 and the pallet sensor 4 feed back the detection signals from the upper and lower sensors 2 and 7 to lift and lower the discharge table 6 and expand and contract the air cylinders 5a and 5b. It is a control device that controls.

Both of the air cylinders 5a and 5b have built-in auto switches 8a and 8b for stopping the operation in a preset extended state. As the auto switches 8a and 8b, various types such as a proximity switch incorporated inside or a limit switch that operates an actuator through movement of a cylinder rod can be adopted.

The upper limit sensor 2 and the pallet sensor 4
Various switches such as a transmission type phototube and a reflection type phototube are adopted for the. Further, as shown in FIG. 1, the elevating means of the discharge table 6 in the pile elevating device suspends the discharge table 6 via a chain 10 around which the sprocket 9 is wound and suspends the same. The motor 11 connected to is rotated to move up and down.

Next, the operation of the pallet position correction device according to the above embodiment will be described with reference to the flow charts of FIGS. 1 and 2. This operation is performed sequentially by a control signal from the control device 7. First, the pile lifting device moves the sheet discharge table 6 to the lowest position and stops it. Then, the pallet 1 is placed on the table 6 (see FIG. 2).
Step (1)). Then, the discharge table 6 is raised (step (2)).

At this time, the pallet 1 is detected by the pallet sensor 4 at a position close to the lower ends of the sheet guides 3a, 3b which are in the process of ascending through the paper discharge table 6, and the operation signal of the pallet 1 causes the pallet to be detected. It temporarily stops at the above position (step (3)). Next, the air cylinder 5a is extended, and the pressing member 12a fixed to the tip of the rod of the air cylinder 5a.
The pallet 1 is moved to the right side in the figure by a predetermined amount via (step (4)). Next, the air cylinder 5b is extended in the same manner as described above, and the pressing member 12 fixed to the tip of the rod thereof is extended.
The pallet 1 is moved to the left side in the figure by a predetermined amount via b (step (5)). As a result, the pallet 1 is set to the same position in the left-right direction without shifting from the target position. The above air cylinders 5
a and 5b are auto switches 8a and 8 incorporated therein.
The operation is controlled by the signal of b, the pallet 1 is moved and corrected to the predetermined position as described above, and then the pallet 1 is retracted to the initial position and stands by.

After the above setting, the pile lifting device again raises the discharge table 6 and the pallet 1 (step (6)), and when the pallet 1 reaches the set upper limit position, the upper limit sensor 2 for detecting the upper limit position is detected. The signal stops the table 6 from rising. (Step (7)). As a result, the position (height) of the pallet 1 becomes the initial setting position, and the sheets 14 sequentially conveyed through the chain gripper 13 and dropped and thrown can be accurately stacked without any deviation.

Since the height of the upper surface of the pallet 1 is controlled so as to be sequentially lowered corresponding to the stacking of sheets as in the conventional one, the number of sheets 14 reaches a predetermined number and the pallet 1
Moves down to the lowest position, this pallet 1 is carried out to the outside, and the next empty pallet 1 is replaced and placed in its place. The sheets 14 are sequentially stacked by repeating the above operation.

The air cylinders 5a and 5b can be replaced with other means such as a hydraulic cylinder and an electric cylinder having the same function. Also, two or more sets of air cylinders are installed in parallel on both sides of the pallet 1 and operated individually or in synchronization. Further, there is also a system in which one side in the vertical direction is replaced with a stopper fixed to a frame and the air cylinder 5 is arranged only on one side.

Further, an automatic switch similar to the one incorporated in the air cylinder 5 is provided on the side of the discharge table 6 of the pile lifting device to detect the mounting state of the pallet 1 and to expand and contract the air cylinder 5. There is also a way to control the operation.

Further, after the paper discharge table 6 is temporarily stopped on its way up, the air cylinders 5a on both sides,
It is also possible to adopt a method of moving and correcting the pallet 1 to a predetermined position by operating the 5b individually or simultaneously.

[0028]

The present invention is configured as described above.
According to the present invention, during the process of raising and setting the sheet stacking pallet placed on the discharge table of the pile lifting device to the initial standby position, the temporary stop detection means
By temporarily stopping at a predetermined position and moving the pallet to a predetermined position on the paper ejection table by the pallet position moving means capable of correcting the vertical position, the pallet can be moved up to the upper limit position again, thereby producing the following effect. .

(1) It is possible to prevent the pallet from colliding with peripheral equipment such as front and rear sheet guides and causing a problem such as deformation and damage.

(2) Detecting the vertical position of the pallet,
Alternatively, adjustment by movement can be applied to pallets of various lengths, that is, sheets of different lengths, and versatility is improved.

(3) The sheets to be stacked by dropping can be surely stacked at the regular positions on the pallet, and the deformation and damage of the sheets can be prevented.

(4) By automating the vertical operation of the pallet, it is not necessary for the driver to monitor the pallet state, and labor is saved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a sheet discharge device of a sheet-fed printing press according to an embodiment of the present invention.

FIG. 2 is a flowchart of a pallet position correction operation in the above embodiment.

FIG. 3 is a schematic structural diagram of a sheet-fed printing press.

FIG. 4 is a corresponding view of FIG. 1 showing a conventional paper discharge device.

FIG. 5 is an enlarged view of the pallet mounting portion in FIG.

[Explanation of symbols]

 1 Pallet 2 Upper limit sensor 3a, 3b Sheet guide 4 Pallet sensor 5a, 5b Air cylinder 6 Paper ejection table 7 Control device 12a, 12b Pressing member

Claims (1)

[Claims] 1. In a sheet-fed printing press equipped with a sheet stacking device for dropping and stacking sheets onto a pallet placed on a discharge table that can be raised and lowered, an upper limit for detecting the upper limit position of the pallet. Position detecting means, temporary stop position detecting means installed on the side of the hoistway of the pallet to detect the position of the pallet in the middle of ascending and temporarily stop the pallet at a predetermined position, and the temporary stop position detecting means. A pallet position correction means for engaging the pallet stopped by a detection signal from the pallet and moving the pallet to a predetermined position; and a control device for controlling the upper limit position detection means, the temporary stop position detection means and the pallet position correction means. A sheet discharging device for a sheet-fed printing press.