JPH05155456A - Paper feeding device for paper printer - Google Patents

Abstract

PURPOSE:To provide a device which is capable of facilitating maintenance of lowering position precision of the rotating end part of a feeder board. CONSTITUTION:An adjust bolt 34 by which the rotating end part of a feeder board 7 rotatably supported on a paper feeding frame 23 side is supported in a lowering position is provided. A rod 32, having a loose margin with which the rotating end part of the feeder board 7 is supported to the adjust bolt 34 under gravity, and a pin 31 are located in the drive system of an air cylinder 28 operated to drive rotation of the feeder board 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device which is provided between a sheet feeding device of a sheet-fed printing press and a printing unit and which feeds sheets fed one by one by the sheet feeding device onto a difference plate. is there.

[0002]

2. Description of the Related Art In a printing operation by a sheet-fed printing press, sheets of paper stacked on a paper stack via a paper stack are sucked one by one by a suction port of a sucker device provided above the paper stack. The paper is conveyed by the advancing of the suction port, and the leading end is captured by the rotating paper feed roller and the paper feed roller that rotates in contact with this. In front of the paper feed roller, a rectangular plate-shaped feeder board that constitutes the paper feeding device is supported in an inclined state, and on this feeder board, a plurality of paper feed tapes arranged in parallel in the width direction of the paper are placed. One end of the paper feed roller is attached to the paper feed roller, and the paper feed roller is attached to the surface of the feeder board to be stretched. A plurality of rubber rollers and brush rollers are pressed against each paper feed tape.

By doing so, the paper caught by the paper feed roller and the paper feed roller and fed onto the feeder board is pinched by the paper feed tape and the rubber roller, and the difference is caused by the running of the paper feed tape. It is configured so that it is conveyed toward the plate, and the register in the leading end of the slip plate aligns the top and bottom and the left and right directions, and then the swing device supplies the print unit.

When adjusting an inking device or a water supply device in a small-sized printing machine, or when replacing a printing plate for backside printing in a double-sided printing machine having a backside printing unit below a feeder board, etc. In order to enable work, the side of the feeder board opposite to the paper feeder must be opened.In this case, the feeder board must move in the direction in which the pivot end rises about the fulcrum of the paper feeder. It is configured to be opened by rotating.

On the other hand, since the rotating end of the feeder board is connected to the difference plate for guiding the paper to the swing device, it is necessary to avoid a step with this. Therefore, conventionally, the rotating end of the feeder board is supported by the height-adjustable adjusting bolt provided on the machine frame side, and the height is adjusted by rotating the adjusting bolt forward and backward so that there is no step. I have to.

[0006]

However, in general, when the feeder board is rotated as described above, the upper end of the rod, which is driven by a motor or a fluid pressure cylinder and moves back and forth in the vertical direction, is moved to the center of the feeder board in the front-rear direction. Since the feeder board is pivoted by pivoting and moving this rod forward and backward, the motor and fluid pressure cylinder are stopped just when the pivoting end of the feeder board is seated on the adjusting bolt. Therefore, it is difficult to accurately position the lower limit position of the feeder board.

For example, when the drive device for rotating the feeder board is an air cylinder, the positioning adjustment is performed by adjusting the stroke end of the air cylinder and adjusting the adjusting bolt. Since the upper end of the rod that moves forward and backward by the cylinder is pivotally attached to the center of the feeder board, the rod may be pulled too much by the air cylinder and the feeder board may bend. Not only there is a problem that adjustment becomes difficult due to the difference between the limit of rotation and the actual rotation end, and the fact that the feeder board is bent repeatedly causes it to be bent and interferes with paper transportation. There's a problem.

Further, when the driving device for rotating the feeder board is a motor, there is an overrun after the stop switch of the motor is operated. There is a problem in that there is a difference between the descending stop position of the tip of the feeder board due to continuous rotation and the stop position of the feeder board, which makes adjustment difficult.

The present invention has been made in view of the above points, and sheet-fed printing capable of easily maintaining the lower limit position accuracy of the rotating end of the feeder board which is rotated by being driven by the driving device. It is an object of the present invention to provide a paper feeding device for a machine.

[0010]

In order to achieve such an object, according to the present invention, in a paper feeding device of a sheet-fed printing press, a feeder board rotatably supported on a machine frame side, A support member for supporting the lowering of the rotation end of the feeder board and a drive device for driving the rotation of the feeder board are provided, and the rotation end of the feeder board is attached to the drive system of the drive device by its own weight. An engaging member having a play allowance to be supported by the supporting member is interposed. Further, in the paper feeding device of the sheet-fed printing press according to claim 1,
A sensor is provided to stop the driving device by detecting the contact of the driving device side member which continues descending after the rotating end of the feeder board is supported by the supporting member.

[0011]

During the printing operation, the rotating end portion of the feeder board is supported by the supporting member to regulate the rotation, and the feeder board is inclined so that the leading end and the difference plate occupy a predetermined relative position. There is. When the printing operation is started in this state, the paper feed tape that comes in contact with the upper surface of the feeder board runs, so the paper fed from the paper feeding device is fed by the paper feed tape and a large number of rubber rollers pressed from above. It is nipped and conveyed with brush rollers.

When it is desired to open the lower part of the front end portion of the feeder board for maintenance work or the like, the feeder board is rotated by the drive unit. In this case, the play allowance in the drive system is biased toward the drive side. The board behaves like a drive.

When the printing work is restarted after the maintenance work or the like, when the feeder board is driven and rotated by the driving device, the rotating end portion is lowered by its own weight and seated on the support member. In this way, even after the rotation of the feeder board has stopped, there is still room to play, so the members on the drive side continue to move,
The sensor detects this and then stops. Therefore, in this case, the feeder board on the driven side is not excessively bent and bent.

[0014]

1 to 3 show an embodiment of a sheet feeding device of a sheet-fed printing machine according to the present invention, and FIG. 1 is a schematic side view of a multicolor double-sided sheet-fed printing machine according to the present invention. 2 is a side view of the connecting portion between the driving side member and the driven side member, and FIG. 3 is the same plan view. In the figure, a multi-color double-sided sheet-fed printing press 1 is equipped with a paper feeding device 2, and the paper feeding device 2 has a paper stacking table 4 on which papers 3 are stacked, and a stacking paper 3 from the upper one. A sucker device 6 having a suction port 5 that sucks the sheets one by one and moves to the front, and a feeder board 7 that is provided by inclining in front of the sheet feeding device 2 by catching the paper 3 conveyed to the front by the suction port 5 (details will be described later). As described above, a paper feed roller 8 and a paper feed roller 9 that feed the paper upward are provided. Further, in front of the feeder board 7, a difference plate 10 provided with a registering device for aligning the paper 3 conveyed along the surface thereof in the vertical direction and the left-right direction, and the difference plate 10.
And a swing device 11 for holding the paper 3 stopped at the leading end of the paper and supplying it to the printing device.

In the case of a multi-color printing machine, the printing unit 12 for the first color has a transfer cylinder 13 close to the swing device 11.
And an impression cylinder 14 that contacts the lower end of the impression cylinder, another impression cylinder 15 that contacts the impression cylinder 14, and a plate cylinder 17 that contacts the impression cylinder 15 via a rubber cylinder 16. An ink device and a water supply device (not shown) are provided above and on the side of the body 17. Reference numeral 18 is a transfer cylinder provided between the first color printing unit 12 and the second color printing unit.
It only has a blanket cylinder, an impression cylinder, an inking device, and a water supply device.

With this structure, the swing device 11, the transfer drum 13, the impression drum 14, and the impression drum 15 are gripped by the claws in this order and transferred to the surface of the paper 3 from the inking device. Plate cylinder 17 with ink and water from the water supply device
The image formed on the upper plate surface and then transferred to the blanket cylinder 16 is transferred and printed. After that, the paper 3 to be printed by the second to fourth color printing units is discharged and stacked on the paper stack by the paper discharge device.

A back side printing device is attached to the printing machine. That is, on the side of the impression cylinder 14, the blanket cylinder 1
9 are in contact with each other, and a plate cylinder 20 is in contact with the side of the blanket cylinder 19. Further, on the side of the first color printing unit 12, a back side printing unit 21 including an ink device and a water supply device (not shown) is provided on the bed 22 so as to be movable in a perspective direction with respect to the printing unit 12. By bringing the back side printing unit 21 into contact with the printing unit 12, the inking roller of the inking device and the swimsuit roller of the water supply device are in contact with the plate surface of the plate cylinder 20. An image is formed on the plate surface on the cylinder 20, the image is transferred to the paper stack 3 via the blanket cylinder 19 and back side printing is performed, and then the front side printing is performed in the printing unit 12 and thereafter. ing.

Now, the feeder board 7 and its rotating device will be described. Both ends of a bracket shaft 24 are inserted and fixed in shaft holes provided at the front ends of the left and right paper feeding frames 23 that support the paper stacking base 4, the sucker device 6, and the like. A pair of left and right brackets 25 are rotatably supported adjacent to the inside of the paper feed frame at both ends of the. The feeder board 7 having both right and left ends fixed to the bracket 25 is formed in a frame shape by the left and right frames fixed to the bracket 25 and formed into a long plate shape, and a plurality of stays connecting the left and right frames. A rectangular plate-shaped board that constitutes the feeder board 7 together with the left and right frames and stays is attached to the upper surface thereof.

On the upper surface of such a feeder board 7,
The paper feed roller 8, the roller 26 pivotally attached to the front end portion of the feeder board 7, and the plurality of rollers between the rollers 8 and 26 are stretched by being attached to the plurality of rollers. Paper feed tapes are attached in parallel in the machine width direction,
These paper feed tapes are configured to run by being driven from the paper feed roller 8 side. A plurality of rubber rollers and brush rollers are pressed against each paper feed tape. By doing so, the paper 3 captured by the paper feed roller 8 and the paper feed roller 9 and fed onto the feeder board 7 is sandwiched by the paper feed tape and the rubber roller, and the paper feed tape runs. It is configured to be conveyed toward the difference plate 10, aligned by the register device at the tip of the difference plate 10 in the vertical and horizontal directions, and then supplied to the transfer drum 13 of the printing unit 12 by the swing device 11. There is.

On the other hand, an air cylinder 28 as a feeder board swinging drive device is swingably supported by a bracket 27 fixed to the lower end portion of the paper feed frame 23, and the working end of a piston rod 29 thereof. Is a T that is rotatably attached at one end to the center of the paper feeding frame 23 in the height direction.
The lever 30 is pivotally attached to the center of the character-shaped lever 30. Further, a pin 31 is planted at the other end of the lever 30, and the pin 31 has a rod 32 and the like, one end of which is rotatably attached to the longitudinal center of the frame constituting the feeder board 7. The U-shaped portion 32a at the end is engaged.

As a result, when the piston rod 29 of the air cylinder 28 is moved forward by air pressure, the lever 30 is rotated and the rod 32 is moved forward by the engagement between the U-shaped portion 32a and the pin 31, so that the feeder board 7 is moved. When the rotating end moves up to the non-use position shown by the chain line in the figure, and when the piston rod 29 of the air cylinder 28 is retracted by the air pressure, the lever 30
Is rotated, and the rotation end of the feeder board 7 in which the U-shaped portion 32a and the pin 31 are engaged is rotated by its own weight in the direction in which the feeder board 7 is lowered together with the rod 32 to the use position shown by the solid line in the figure. Is configured.

Further, below the rotating end of the feeder board 7, an adjusting bolt 34, which can be moved forward and backward by loosening the nut 33, is supported at the rotating end lowering position of the feeder board 7 shown by the solid line in the figure. By supporting in this way, the plane of the tip of the feeder board 7 in the lowered position becomes flush with the plane of the difference plate 10, for example, so that the plane has a predetermined height. .. In addition, the U-shaped portion 32a and the pin 31
Since the and are engaged with each other, the pivot end of the feeder board 7 descends, and after the seat is seated on the adjusting bolt 34, the piston rod 29 of the air cylinder 28 is moved to the rod 32.
It is configured to continue to recede, albeit only slightly.

Further, a stay 3 for connecting the left and right rods
5, a limit switch 36 as a detection sensor is fixed, and a conical portion 31a is formed at the tip of the pin 31, and the conical portion 31a is the limit switch 36.
A signal is emitted by contacting the contact point of the above, and the descent of the piston rod 29 of the air cylinder 28 is stopped. That is, after the turning end of the feeder board 7 is seated on the adjusting bolt 34, the piston rod 29 continues to move backward, and the conical portion 31a comes into contact with the contact point of the limit switch 36.
The piston rod 29 is configured to stop descending.

The operation of the paper feeding device configured as described above will be described. During the printing operation, as shown by the solid line in FIG. 1, the rotation end of the feeder board 7 is supported by the adjustment bolt 34 adjusted in advance to regulate the rotation, and the feeder board 7 is inclined and its front end is inclined. And the difference plate 10 occupy a predetermined relative position. When the printing operation is started in this state, the paper feeding tape attached to the upper surface of the feeder board 7 runs, so that the paper fed from the paper feeding device is
The paper feed tape is pinched and conveyed by a large number of rubber rollers and brush rollers arranged in parallel in a plurality of columns and a plurality of rows pressed against the paper feed tape.

When it is desired to open the lower part of the front end of the feeder board 7 for maintenance work or the like, when the feeder board raising switch is pushed by the push button operation, the solenoid valve is switched and the brake of the air cylinder 28 is released. At the same time, air is supplied to the piston rod 2 of the air cylinder 28.
9 moves forward, the lever 30 rotates, and the pin 31 and the U-shaped portion 3
Since the rod 32 is pushed up by the engagement with 2a, the feeder board 7 rotates about the bracket shaft 24 and stops at the stroke end of the air cylinder 28 and becomes horizontal as shown by the chain line in FIG. The lower part is opened.

When the printing work is restarted after the maintenance work and the like, when the piston rod 29 of the air cylinder 28 is moved backward by the push button operation, the lever 30 is rotated and the pin 31 and the U-shaped portion 32a are engaged. In other words, the feeder board 7 rotates together with the rod 32 by its own weight, and its rotation end is seated on the adjusting bolt 34, whereby the rotation is stopped. Even after the rotation of the feeder board 7 is stopped, the lever 30 and the piston rod 29 continue to rotate while leaving the rod 32 while sliding the pin 31 in the U-shaped portion 32a, and the air cylinder 28 moves its stroke. Stop at the end.

When the rotating end of the feeder board 7 descends in this manner, foreign matter is caught or reluctant to twist and the rotating end of the feeder board 7 does not descend and the piston rod 29 of the air cylinder 28 does not descend. When only one moves backward, the conical portion 31a of the pin 31 pushes the contact of the limit switch 36, breaks the circuit of the downward push button, and brakes the air cylinder 28, so that the pin 31 and the U-shaped portion 32a are disengaged. Can be prevented.

As described above, since the pivot end of the feeder board 7 is seated on the adjusting bolt 34 to be positioned regardless of the lowering of the piston rod 29, the positioning is always accurate. Further, even if the piston rod 29 continues to descend, the rod 32 remains and does not move. Therefore, unlike the conventional case, the rod 32 does not pull the feeder board 7 too much and bends.

The air cylinder 28 does not have to be stopped at the stroke end, but may be stopped by pushing the contact of the limit switch 36 with the conical portion 31a of the pin 31.

FIG. 4 is a partially cutaway front view of a paper feeding device as another embodiment of the present invention. The present embodiment shows an example in which a motor is used as a drive device for rotating the feeder board.
The motor shaft 42 of the motor 41 supported via
A sprocket 43 is rotatably attached, and screws are rotatably supported at both upper and lower ends in a shaft hole of an angular stay 44 that connects the left and right paper feed frames 23 and an L-shaped bracket 45 on the paper feed frame 23 side. Between the sprocket 47 on the shaft 46 and the sprocket 48 pivotally attached to the corner stay 44,
The chain 49 is stretched. Also, sprockets 4
A chain 53 is also stretched between 7 and the sprocket 51 and the sprocket 52 on the opposite screw shaft 50.

By rotating the motor 41, the chains 49, 5
The screw holes of the elevating blocks 54 and 55 are respectively screwed into the left and right screw shafts 46 and 50 which are driven and rotated by the screw shafts 3, and the rotation of the screw shafts 46 and 50 causes the screw action to cause a solid line and a chain line. It is configured to move up and down as indicated by. Reference numeral 56 denotes a guide shaft having upper and lower ends supported by the L-shaped bracket 45 and the corner stay 44 and guiding the vertical movement of the elevating blocks 54 and 55.

On the other hand, the same feeder board 7 as in the above-described embodiment is rotatably supported on the left and right paper feed frames 23 by a lever 57 pivotally supported on the paper feed frame 23. The left and right rods 60, which are connected to each other by stays 58, are suspended. And
At the lower end of the rod 60, a U-shaped portion 60a similar to that in the above-described embodiment is formed, and this U-shaped portion 60a is slidably engaged with a pin 61 protruding from the elevating blocks 54 and 55. Have been combined. 62 is a bracket 63 on the rod 60 side
Is a limit switch that stops the motor 41 when the conical portion at the tip of the pin 60a abuts on the contact. Although the illustration of the adjusting pin for supporting the rotating end portion of the feeder board 7 is omitted, it is provided at the same position as that of the above-described embodiment and with the same configuration.

The operation of the paper feeding device configured as described above will be described. During the printing operation, the rotating end of the feeder board 7 is supported by the adjustment bolt 34 adjusted in advance to regulate the rotation, and the feeder board 7 is inclined and the tip and the difference plate 10 are predetermined. Occupy the relative position of. When the printing work is started in this state, the paper feed tape attached to the upper surface of the feeder board 7 runs,
The paper fed from the paper feeding device is nipped and conveyed by the paper feeding tape and a large number of rubber rollers and brush rollers arranged in parallel in a plurality of columns and a plurality of rows pressed against the paper feeding tape.

When it is desired to open the lower part of the front end of the feeder board 7 for maintenance work or the like, when the motor 41 is rotated by the push button operation, the screw shafts 46 and 50 rotate in synchronization via the chains 49 and 53. Then, the elevating blocks 54 and 55 are raised from the solid line position to the chain line position by the screw action. As a result, the rod 61 is pushed up by the engagement between the pin 61 and the U-shaped portion 60a, and the feeder board 7 rotates,
When rotated to a predetermined position, the rotation of the motor 41 is stopped by the action of a limit switch (not shown), the feeder board 7 becomes horizontal, and the lower part thereof is opened.

When maintenance work and the like are finished and printing work is restarted, the motor 41 is rotated in the opposite direction to the screw shafts 46 and 50 by the push button operation, and the pin 61 and the U-shaped portion 60a are formed. While the gears are engaged with each other, the feeder board 7 rotates together with the rod 60 due to its own weight, and the rotation end portion is seated on an adjusting bolt (not shown) to stop the rotation. Even after the rotation of the feeder board 7 is stopped, the elevating blocks 54 and 55 continue to descend while leaving the rod 60 while sliding the pin 61 in the U-shaped portion 60a.
The rotation of the motor 41 is stopped by the contact of the conical portion of the pin 61 with the contact of the limit switch 62.

As described above, when the rotating end of the feeder board 7 descends, foreign matter is caught or reluctant to twist and the motor 41 continues to rotate without lowering the rotating end of the feeder board 7. , The conical portion 61a of the pin 61 pushes the contact of the limit switch 62, breaks the circuit of the downward push button, and brakes the motor 41, so that the engagement between the pin 61 and the U-shaped portion 60a should be prevented. You can

As described above, since the turning end of the feeder board 7 is seated on the adjusting bolt, the feeder board 7 is positioned regardless of the rotation of the motor 41, so that the feeder board 7 is always positioned accurately. Even if the motor 61 continues to rotate, the rod 60
Is not moved, the rod 60 does not pull the feeder board 7 too much and bends unlike the conventional case.

In this embodiment, the pin 31 and the U-shaped portion 32a (62a) are illustrated as the engaging member having the allowance, but the U-shaped portion formed in a U-shape instead of the U-shaped portion 32a. May be provided, and this U-shaped portion 32a (62a)
The engaging hole with the U-shaped portion of the pin 31 may be a blind-shaped long hole instead of the long groove opened to one side. Further, a limit switch 36 (62) is provided on the side of the pin 31 (61) integrated with the lever 30 and the elevating block 54, and a striker for operating this limit switch is provided with a rod 32 (6).
It may be provided on the 2) side.

Further, a limit switch is provided directly on the lever 30 and the elevating block 54, and a striker is provided on the rod 32.
It may be provided at (62). Further, in each of the above-described embodiments, the example is shown in which the engaging member rod 32 (62) having the allowance is provided at the lower end portion, but it may be provided between the upper end portion of the rod 32 (62) and the feeder board. Good.

[0040]

As is apparent from the above description, according to the present invention, in the paper feeding device of the sheet-fed printing press, the feeder board rotatably supported on the machine frame side and the rotation of the feeder board. A support member for supporting the lowering of the moving end,
A drive device for driving the rotation of the feeder board is provided, and an engagement member having a play allowance for allowing the rotating end portion of the feeder board to be supported by the support member by its own weight is provided in the drive system of the drive device. Therefore, when returning the feeder board rotated to open the work surface for maintenance work to the inclined state to restart the printing work,
Even after the feeder board descends under its own weight and comes into contact with the bearing member and is positioned, there is play, so the member on the drive side continues to move, and the sensor detects this and then stops, so the driven side The paper feeding function on the feeder board is improved without causing the feeder board to be pulled too much and bent. Further, since the feeder board is positioned only by the support member regardless of the rotation of the feeder board by the driving device, the positioning can be performed reliably and easily, and the effect is great.

According to the second aspect of the present invention, there is provided a sensor for detecting the contact of the driving device side member which continues descending after the pivot end of the feeder board is supported by the supporting member and stops the driving device. By providing it, even if a problem occurs while the rotating end of the feeder board continues to descend, it does not apply an excessive load or the engaging part does not disengage, and the function and safety of the device. Is improved.

[Brief description of drawings]

FIG. 1 is a schematic side view of a multi-color double-sided sheet-fed printing press embodying the present invention.

FIG. 2 is a side view of a connecting portion between a driving side member and a driven side member.

FIG. 3 is a plan view of a connecting portion between a driving side member and a driven side member.

FIG. 4 is a partially cutaway front view of a paper feeding device as another embodiment of the present invention.

[Explanation of symbols]

 7 Feeder Board 23 Paper Feed Frame 28 Air Cylinder 34 Adjust Bolt 31 Pin 32 Rod 32a U-Shape 36 Limit Switch 41 Motor 60 Rod 60a U-Shape 61 Pin 62 Limit Switch

Claims (2)

[Claims] 1. A feeder board that is rotatably supported on the machine frame side, a support member that supports the lowering of the rotating end of the feeder board, and a drive device that drives the rotation of the feeder board. And a driving member of the driving device, an engaging member having an allowance for allowing the rotating end portion of the feeder board to be supported by the supporting member by its own weight is interposed. Paper feeder. 2. The sheet feeding device for a sheet-fed printing press according to claim 1, wherein the rotary end of the feeder board is supported by a support member and then driven to detect a contact with a member on a drive device which continues to descend. A sheet feeding device for a sheet-fed printing press, comprising a sensor for stopping the device.