JP3898930B2 - Sheet-fed paper feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet feeding device in a sheet-fed printing press.
[0002]
[Prior art]
In a sheet feeding device in a sheet-fed printing press, a sheet fed from a sheet feeding unit to a table is conveyed in one direction by a double row conveying belt, and a pressing roller is provided on each conveying belt to press the sheet against the conveying belt. I am doing so. Here, the presser roller is elastically supported by a leaf spring or the like, and presses the sheet with a predetermined pressure. Further, the position of the pressing roller is adjusted in the sheet conveyance direction according to the sheet size. When adjusting the position of each of the press rollers, adjusting the position of each press roller takes time and effort. Therefore, the positions of a plurality of press rollers can be adjusted collectively.
[0003]
In the sheet-fed printing machine, the front edge of the sheet fed from the paper feeding unit onto the table is positioned at the front side and the one side edge is positioned, and after the positioning, the gripper nail provided on the impression cylinder The sheet is fed in time with the phase.
[0004]
When the sheet is positioned, an error occurs in the sheet feeding and the sheet is not fed, or when the leading edge of the sheet is positioned with respect to the front contact, a register failure may occur due to overshooting, rebounding, bending, or the like. Such a register failure is detected by a detection sensor. When the detection sensor detects a register failure, the machine is automatically stopped and the sheet is manually removed.
[0005]
[Problems to be solved by the invention]
By the way, when removing a sheet due to a register failure, conventionally, a plurality of pressing rollers are moved back together and the sheet is removed after being positioned behind the trailing edge of the sheet to be removed. Therefore, it took a lot of time to eject the paper.
[0006]
Some sheet feeding devices support a plurality of roller units that support a plurality of press rollers in a swingable manner and swing the entire roller unit upward to remove a sheet. In this case, it is necessary to increase the rigidity of the roller unit so as not to be deformed, the configuration of the roller unit becomes complicated, and the weight also increases, which causes a disadvantage that a large operating force is required to swing the roller unit. is there.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet feeding device having a simple configuration that can easily and efficiently eliminate a sheet due to a register defect.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, in the present invention, a double row conveying belt that conveys a sheet in one direction, a table that supports a carrier side belt of the conveying belt, and upper portions on both sides of the table are provided. A pair of racks, a gate-shaped movable frame that spans a square cylindrical arm support shaft between a pair of slide guides movable along each rack, and both ends of the slide guides inserted into the arm support shaft. And a pinion that meshes with each rack that is fixed to the gear shaft, and the arm support shaft. A plurality of roller arms supported at one end by a plurality of roller arms, and a pressing roller elastically supported by the other end of each roller arm and elastically abutting against the conveying belt. Both end portions of the arm support shaft rotatably supported by a slide guide that is had adopted a configuration in which connecting lever for rotating operation on the arm support shaft.
[0009]
With the above configuration, the arm support shaft can be rotated by operating the lever, so that the plurality of roller arms can be collectively swung in the direction in which the presser roller at the tip is separated from the transport belt. Thus, a sheet due to a register failure can be easily and efficiently eliminated.
[0010]
Here, by providing a detent mechanism that prevents the arm support shaft from rotating at a position where the presser roller presses the transport belt and a position away from the transport belt, the position where the presser roller is separated from the transport belt Therefore, it is not necessary to hold the lever when removing the sheet due to a register failure, and the sheet can be removed more easily.
[0011]
As the anti-rotation mechanism, a circular holder attached to both ends of the arm support shaft is rotatably supported by each slide guide, and the first engagement hole and the second engagement hole are circumferentially spaced on the outer periphery of the holder. The slide guide has an engagement pin provided with a projecting property toward the outer periphery of the holder by the elasticity of the spring. The engagement pin, the first engagement hole, and the second engagement hole It is possible to employ a configuration in which an index plunger that prevents the holder from rotating by engagement is attached.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, a double row conveying belt 1 that conveys a sheet fed from a sheet feeding unit (not shown) toward a printing unit is passed between a front roller 2 and a rear roller 3. The sheet is conveyed in the direction of the arrow 1.
[0013]
The carrier side belt 1 a in the double-row transport belt 1 is supported by a table 4. A pair of racks 5 are provided at the upper part on both sides of the table 4. The rack 5 extends long in the sheet conveyance direction.
[0014]
A movable frame 6 is provided on the table 4. The movable frame 6 has a gate shape in which an arm support shaft 8 is bridged between a pair of slide guides 7 that can move along the racks 5.
[0015]
As shown in FIG. 4, the slide guide 7 includes an L-shaped bracket 9 and a slide block 10 having one end connected to the lower surface of the bracket 9 and the other end slidable with respect to the lower surface of the rack 5. The bearing block 11 is connected to the upper portion of the bracket 9 and the lower portion of the outer surface is slidable with respect to the inner surface of the rack 5.
[0016]
The arm support shaft 8 has a rectangular tube shape, and circular bearing holders 12 attached to both ends thereof are fitted in bearing holes 13 formed in the bearing block 11 and supported rotatably.
[0017]
A gear shaft 14 is inserted inside the arm support shaft 8, and the gear shaft 14 is inserted into an insertion hole 15 formed in the bracket 9 of the slide guide 7 and is rotatably supported. A pinion 16 is attached to the gear shaft 14 at a portion inserted into the slide guide 7, and the pinion 16 meshes with the rack 5.
[0018]
The gear shaft 14 is fixed by a lock bolt 17 screwed from the upper outer peripheral portion of the bracket 9 toward the insertion hole 15, and the lock bolt 17 is loosened and rotated by an operation of a knob 18 attached to one end of the gear shaft 14. As a result, the movable frame 6 moves in the length direction of the pair of racks 5 so that the position of the movable frame 6 can be adjusted.
[0019]
As shown in FIGS. 1 and 3, a U-shaped frame body 20 attached to each rear end portion of the plurality of roller arms 19 is slidably fitted to the arm support shaft 8.
[0020]
Therefore, the position of the roller arm 19 can be adjusted in the axial direction of the arm support shaft 8, and the roller arm 19 is fixed at the adjustment position by tightening the bolt 20 a screwed to the frame body 20.
[0021]
The rear end portion of the leaf spring 21 is connected to the distal end portion of the roller arm 19, and the presser roller 22 is rotatably supported on the distal end portion of the leaf spring 21. The presser roller 22 is pressed against the carrier side belt 1 a of the transport belt 1 by the elasticity of the leaf spring 21.
[0022]
In addition, although the leaf | plate spring 21 can adjust an elastic force, the elasticity adjustment means of the leaf | plate spring 21 is abbreviate | omitted in the figure.
[0023]
As shown in FIG. 5, a connecting block 24 attached to the end of the lever 23 is connected to one end of the arm support shaft 8. By rotating the arm support shaft 8 by operating the lever 23, the presser roller A plurality of roller arms 19 can be collectively swung toward a position where 22 is separated from the carrier side belt 1a of the conveyor belt 1.
[0024]
The arm support shaft 8 is prevented from rotating by a rotation preventing mechanism 25 provided between the bearing block 11 and the bearing holder 12.
[0025]
As shown in FIG. 6, the anti-rotation mechanism 25 is provided with a first engagement hole 26 and a second engagement hole 27 on the outer periphery of the bearing holder 12 at an interval of approximately 90 ° in the circumferential direction. 11, an index plunger 29 is attached to a screw hole 28 extending from the outer peripheral upper part to the bearing hole 13.
[0026]
Here, the index plunger 29 slidably inserts an engagement pin 31 into a screw cylinder 30 that is screw-engaged with the screw hole 28, and a knob 32 is attached to a rear end portion of the engagement pin 31, and the screw The engagement pin 31 is pressed in the axial direction by a spring 33 incorporated in the cylinder 30 so that the distal end portion of the engagement pin 31 protrudes from the distal end of the screw cylinder 30. By engaging the tip portion with the first engagement hole 26, the arm support shaft 8 is prevented from rotating in a state in which the presser roller 22 presses the transport belt 1. Further, by engaging the engagement pin 31 with the second engagement hole 27, the arm support shaft 8 is prevented from rotating in a state where the presser roller 22 is separated upward from the transport belt 1.
[0027]
The sheet feeding device shown in the embodiment has the above-described configuration. When the sheet is conveyed, the pressing roller 22 is in elastic contact with the carrier side belt 1a of the conveying belt 1, and the conveying belt 1 is moved in the direction of the arrow in FIG. Move.
[0028]
The presser roller 22 adjusts the position according to the size of the conveyed sheet. When adjusting the position of the presser roller 22, the lock bolt 17 shown in FIG. 4 is loosened, the gear shaft 14 is rotated by the operation of the knob 18, and the movable frame 6 is moved to the pair of racks 5 by the rotation of the pinion 16 meshing with the rack 5. Move along.
[0029]
A sheet feeding device normally conveys a sheet in a lapped state. The front edge of the sheet to be conveyed is received by a front contact (not shown) provided on the front side portion of the table 4 and the front edge is positioned. After the positioning, the sheet is laterally pulled in a direction perpendicular to the conveyance direction and is not shown. One side edge is positioned by contact with the horizontal needle.
[0030]
When positioning the sheet as described above, if the sheet is not fed due to an error in feeding the sheet, or the sheet is excessively moved, rebounded or bent when the leading edge of the sheet is positioned with respect to the front contact, a register failure occurs. Then, the sheet feeder is held in a stopped state.
[0031]
In the stopped state, the sheet having the register failure is removed. When the sheet is removed, the end of the engagement pin 31 is pulled out from the first engagement hole 26 by lifting the knob 32 of the index plunger 29 shown in FIG. As a result of this operation, the arm support shaft 8 is rotated, and the plurality of roller arms 19 are collectively swung in the direction in which the presser roller 22 is separated from the transport belt 1. When the arm support shaft 8 rotates, the bearing holder 12 rotates together with the arm support shaft 8, and when the second engagement hole 27 provided in the bearing holder 12 faces the engagement pin 31 of the index plunger 29, the engagement pin 31 is engaged with the second engagement hole 27, and the arm support shaft 8 is prevented from rotating by the engagement, and the plurality of roller arms 19 are held in a state where the presser roller 22 is separated from the conveying belt 1. Remove the defective sheet.
[0032]
Thus, by operating the lever 23 to rotate the arm support shaft 8, the plurality of press rollers 22 can be separated from the transport belt 1 at a time, so that the press rollers pass the trailing edge of the sheet. Compared with a paper feeding device that is retracted to a position or a paper feeding device that swings a roller unit having a plurality of pressing rollers, sheets due to register defects can be removed very easily and efficiently.
[0033]
In addition, since the arm support shaft 8 has a simple configuration in which a plurality of roller arms 19 that support the presser roller 22 are connected, the arm support shaft 8 is lightweight and can be rotated with a small operating force.
[0034]
【The invention's effect】
As described above, in the present invention, by rotating the arm support shaft by operating the lever, the plurality of presser rollers supported by each of the plurality of roller arms are collectively released in a direction away from the conveying belt. Therefore, it is possible to easily and efficiently remove the sheet due to a register failure.
[0035]
In addition, since the arm support shaft has a simple configuration in which a plurality of roller arms that support the presser roller are connected, the arm support shaft is lightweight and can be rotated with a small operating force.
[Brief description of the drawings]
FIG. 1 is a plan view of a paper feeding apparatus according to the present invention. FIG. 2 is a front view of FIG. 1. FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 5 is a partially enlarged cross-sectional view. FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 4. FIG.
DESCRIPTION OF SYMBOLS 1 Conveyance belt 1a Carrier side belt 4 Table 5 Rack 6 Movable frame 7 Slide guide 8 Arm support shaft 14 Gear shaft 16 Pinion 18 Knob 19 Roller arm 22 Presser roller 23 Lever 25 Anti-rotation mechanism 26 First engagement hole 27 Second engagement Joint hole 29 Index plunger 31 Engagement pin 33 Spring

Claims (3)

A double-row conveying belt that conveys the sheet in one direction, a table that supports the carrier side belt of the conveying belt, a pair of racks provided on both upper sides of the table, and a pair that is movable along each rack A gate-shaped movable frame that spans a square tube-shaped arm support shaft between two slide guides, and is inserted into the arm support shaft so that both ends are rotatably supported by the slide guide and penetrates one slide guide. A gear shaft having a knob fixed to an end facing the outside, a pinion meshing with each rack fixed to the gear shaft, a plurality of roller arms having one end supported by the arm support shaft, A presser roller that is elastically supported by the other end of the roller arm and elastically abuts against the conveyor belt. Both ends of the arm support shaft of the movable frame are supported by slide guides. Rolling freely supported, the sheet feeding apparatus of the arm support shaft to the rotating operation sheet-fed printing press obtained by connecting lever for. 2. The sheet feeding device of a sheet-fed printing press according to claim 1, wherein the arm support shaft is provided with a detent mechanism that prevents the arm support shaft from rotating at a position where the pressing roller presses the conveying belt and a position away from the conveying belt upward. The anti-rotation mechanism rotatably supports a circular holder attached to both ends of the arm support shaft by each slide guide, and the first engagement hole and the second engagement hole are circumferentially spaced on the outer periphery of the holder. The slide guide has an engagement pin provided with a projecting property toward the outer periphery of the holder by the elasticity of the spring. The engagement pin, the first engagement hole, and the second engagement hole The sheet feeding device for a sheet-fed printing press according to claim 2, comprising an index plunger for preventing the holder from rotating by engagement.

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