JP4028933B2 - Paper feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper feeding device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a type of rotary stencil printing press that includes, for example, a paper feeding device 1 whose main part is shown in FIG. The sheet feeding table 3 of the sheet feeding apparatus 1 is slidably supported by the apparatus main body 2 so that the sheet feeding table 3 including the width guide plate 4 can be moved integrally using the screw mechanisms 5 and 6. It has become. When the paper feed table 3 is moved in the paper width direction S, the position in the width direction of the paper that the paper feed ring 8 sends to the plate cylinder side changes, so the printing position on the paper can be changed.
[0003]
By the way, conventionally, only about 1000 sheets of paper are placed on the paper feed base 3 of the paper feed device 1 and the paper does not become so heavy, so that the paper feed base 3 is integrated as described above. It has been relatively easy to configure to move.
[0004]
However, in recent years, there has been a request for development of a model capable of supplying a large amount of paper at a time with a rotary stencil printing press. To meet this demand, a large amount of paper (for example, 3000 sheets) can be placed on a paper feed tray at a time. It is necessary to. In such a case, if the paper feed table including the width guide is moved integrally as in the conventional case, the width guide becomes higher because the stacking height of the paper becomes higher, so that the paper can be guided firmly. The device becomes larger overall. Further, since the paper becomes heavier, the support mechanism and screw feed mechanism of the paper feed table are also increased in size and complexity.
[0005]
[Problems to be solved by the invention]
Therefore, a technical problem to be solved by the present invention is to provide a paper feeding device that can adjust the position of the paper in the width direction with a simple configuration.
[0006]
[Means for Solving the Problems]
In order to solve the above technical problem, the present invention makes it possible to move at least a part of the paper feed table in the paper width direction and move the paper in the paper width direction integrally with the paper feed table by the guide plate. Provided is a paper feeding device essentially characterized by what it can do. Specifically, the configuration is as follows.
[0007]
The paper feeding device is erected in a substantially vertical direction so as to face the paper width direction of the paper feeding table and the paper feeding table that is urged and supported so as to be movable in the paper width direction and returnable to the initial position. And a guide plate, and separates and feeds the sheets stacked on the sheet feed table with the same width by the guide plate. The guide plate is supported by the apparatus main body at least on the upper and lower sides of the paper feed table, and is configured to be movable in the paper width direction without interfering with the paper feed table. When the sheet is moved in the sheet width direction, the sheet feeding table is configured to be movable integrally with the sheet by friction between the sheet and the sheet feeding table.
[0008]
In the above configuration, the sheets are stacked on the sheet feed table with the same width by the guide plate. The guide plate can move in the paper width direction without interfering with the paper feed table. When adjusting the position in the paper width direction (perpendicular to the paper feed direction), the guide plate is moved in the paper width direction. Specifically, the guide plate on one side of the sheet is moved in a direction to retract from the sheet, while the guide plate on the opposite side is moved in a direction to push the sheet. At this time, if the sheet is somewhat heavy, at least a part of the sheet feed table (hereinafter also referred to as “moving unit”) moves in the sheet width direction together with the sheet due to frictional force with the sheet. If the paper is light, the paper slides on the paper feed table, moves only the paper, and the moving part of the paper feed table remains stationary. In any case, the sheet can be moved in the width direction by the guide plate.
[0009]
Therefore, the position in the width direction of the paper can be adjusted with a simple configuration.
[0010]
Preferably, a plurality of sets of guide plates are arranged in the paper feed direction, and the paper feed base is provided with through grooves on comb teeth that loosely fit with the plurality of guide plates on both sides of the paper width direction. Yes. Preferably, the paper feed table is disposed on the plurality of rollers arranged in the paper width direction, and is brought into the initial position by the balance of the plurality of springs arranged to face the paper width direction. Energized and supported.
[0011]
For example, if at least a part of the paper feed table supported movably is configured to include a pair of biasing members that elastically bias the paper feed direction in opposite directions to each other in the paper width direction, When there is not, at least a part of the sheet feed stand, that is, the moving unit, has an initial position at a neutral position where urging forces in opposite directions by the pair of urging members are balanced. Regardless of which side of the paper feed platform moves in the paper width direction from the neutral position, one urging force of the urging member increases, the other urging force decreases, and the pair of urging members As a result, the moving part of the sheet feeding table is biased in the direction opposite to the moving direction. In other words, the urging force for returning to the neutral position acts on the moving part of the sheet feed table.
[0012]
According to the above configuration, when the paper is placed on the paper feed tray and the paper is moved by the guide plate, the paper is sufficient, and due to its weight, the frictional force between the paper and the moving portion of the paper feed stand is When the urging force by the urging member is overcome, the moving unit of the sheet feeding table moves together with the sheet. On the other hand, if the amount of paper is small and the frictional force between the paper and the moving part of the paper feed table is defeated by the urging force of the urging member, slippage occurs between the paper and the moving part of the paper feed table. Only the moving part of the sheet feed table returns to the neutral position.
[0013]
Therefore, when the paper runs out or runs out, the moving part of the paper feed table automatically returns to the initial position, so that a sufficient width adjustment range can be secured, which is convenient in operation.
[0014]
Instead of elastically energizing the moving part of the paper feed table and returning it to the initial position, the weight of the moving part of the paper feed table can be used. For example, as shown in FIG. 10, when the mountain-shaped guide recess 102 provided in the moving unit 100 of the paper feed table is configured to be in sliding contact with the fixing unit 110 of the apparatus main body, it is indicated by a dotted line when the urging force F is applied. As described above, the moving unit 100 moves in the paper width direction. However, if the urging force F disappears, the moving unit 100 can return to the initial position by its own weight W as shown by the solid line.
[0015]
In addition, the moving unit of the paper feed table may be configured to be movable only from the initial position to one side in the paper direction, instead of being configured to be movable from the initial position to both sides in the paper width direction.
[0016]
Preferably, the upper and lower portions of the guide plate are supported by the apparatus main body so as to be movable in the paper width direction on both upper and lower sides of the paper feed table.
[0017]
According to the above configuration, since the guide plate is supported at both ends at the top and bottom of the apparatus, even when the vertical dimension of the guide plate is increased to accommodate a large amount of paper, it cantilevered on the paper feed stand as in the conventional apparatus. Compared to the supporting configuration, the simple configuration can reduce the deflection and guide the paper firmly and stably. In particular, in a large-capacity paper feeding device, a large load is applied to the guide plate when a large amount of paper is moved together with the paper feed table. Therefore, the above-described configuration that supports the guide plate at both ends is preferable.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a paper feeding device according to an embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a perspective view of a rotary stencil printing machine using a paper feeder according to an embodiment of the present invention. FIG. 3 is an enlarged perspective view of a main part of the paper feeding device. FIG. 4 is an exploded perspective view of the main sheet feed table of the sheet feeder. FIG. 5 is a cross-sectional view of the main paper feed table. FIG. 6 is an exploded perspective view of the auxiliary sheet feed stand. FIG. 7 is a cross-sectional view of the auxiliary sheet feed table. FIG. 8 is an upper configuration diagram of the sheet feeding device. FIG. 9 is a configuration diagram of the paper feed table lifting mechanism.
[0019]
As shown in FIG. 2, the paper feeding device 10 is provided on one side of the main body of the rotary stencil printing press P. The paper feeding device 10 includes a paper feeding base 20 on which a large amount of paper (for example, 3000 sheets) can be placed, and a pair of width guides 50 that align the width of the paper placed on the paper feeding base 20. The sheet feeding table 20 is moved up and down by a sheet feeding table lifting mechanism 70 described later. The paper feed table 20 automatically rises as the paper is consumed, so that the uppermost paper on the loaded paper always comes into contact with the paper feed ring 12. Specifically, the paper feed ring 12 is fixed so as to be movable in the vertical direction. When the paper on the paper feed tray 20 comes into contact with the paper feed ring 12 and the paper feed ring 12 is lifted, it is detected by a sensor, The ascent of the sheet feed table 20 is stopped. When the paper feed ring 12 rotates, the uppermost paper on the paper feed tray 20 is fed one by one between the plate cylinder and the press roller in the main body of the printing machine, printed, and then fed to the paper feed device 20. Are stacked in order on a paper cradle (not shown) provided on the opposite side. When the paper detection sensor 28 provided on the paper feed tray 30 detects that the paper on the paper feed tray 20 has run out, the operation is stopped.
[0020]
The sheet feeding table 20 includes a main sheet feeding table 30, a fixing unit 22, and an auxiliary sheet feeding table 40 in order from the back of the apparatus. The auxiliary paper feed stand 40 protrudes from the apparatus main body. As will be described later, the moving sections 31 and 41 of the main sheet feeding table 30 and the auxiliary sheet feeding table 40 slide in the sheet width direction S.
[0021]
The pair of width guides 50 includes a plurality of guide plates 52 arranged in the sheet feeding direction (a direction perpendicular to the sheet width direction S) with a gap therebetween. As shown in FIG. 3, comb-like through grooves 31 b are formed on both sides in the paper width direction of the main paper feed table 30 of the paper feed table 20, and are loosely fitted with the guide plate 52. The left and right width guides 50 can be moved independently in the paper width direction S by the operation dial 58.
[0022]
Next, the configuration of the main paper feed tray 30 of the paper feed tray 20 will be described with reference to FIGS. 4 and 5.
[0023]
The main paper feed tray 30 is generally fixed to the base of the paper feed tray 20 and extends in the paper width direction S, and covers the support portions 32 and 33 from above and meshes with each other. And a moving unit 31.
[0024]
Specifically, each of the support portions 32 and 33 generally has four side walls that surround the periphery and a bottom wall that is fixed to the apparatus main body, and is open upward. Each of the support portions 33 on both sides has three support rollers 38, and the center support portion 32 has one support roller 38 in the center thereof. Each support roller 38 is rotatably supported by support shafts 32a and 33a which are fixed at both ends between side walls extending in the paper width direction S and extend in the paper feed direction, and a part of each support roller 32 and 33 is supported. It protrudes upward from the opening and comes into contact with the moving part 31. Thus, the moving unit 31 is supported from below by the support roller 38 and can slide in the paper width direction S.
[0025]
The center support portion 32 includes an engagement pin 36, a fixing pin 32 b, and a tension spring 34 on both sides in the sheet width direction S. The engagement pin 36 is supported so as to be movable in the paper width direction S by a long hole 32 c formed in the side wall of the support portion 32. The fixing pin 32b is fixed to the side wall outside the engaging pin 36. Both ends of the tension spring 34 are engaged with the engaging pin 36 and the fixing pin 32b, respectively, and the engaging pin 36 is pulled outward. The end portions 36 a of the respective engagement pins 36 protrude from the side walls and are respectively locked to a pair of locking portions 31 a provided on the lower surface of the moving portion 31. The pair of locking portions 31a are pulled in opposite directions by the tension springs 34, respectively, and the left and right pulling forces are balanced when the respective engagement pins 36 are positioned at the approximate center of the elongated hole 32c. . Even if the moving unit 31 slides from the neutral position to either side in the sheet width direction S, the balance of the tensile force of the left and right tension springs 34 is lost, and the moving part 31 automatically returns to the neutral position.
[0026]
Next, the configuration of the auxiliary paper feed tray 40 of the paper feed tray 20 will be described with reference to FIGS. 6 and 7.
[0027]
The auxiliary paper feed base 40 is a box-shaped member that generally includes a support portion 42 and a moving portion 41 that covers the support portion 42 from above.
[0028]
The support 42 is fixed to the base of the paper feed table 20 on the side of the paper feed ring 12 of the rectangular main body that opens upward. Inside the rectangular main body, there are four support rollers 48 each supported by two pairs of side walls extending in the paper width direction S. Each support roller 48 is rotatably supported by a support shaft 42 a that is fixed at both ends between the side walls and extends in the paper feed direction, and a part of the support roller 48 extends upward from the opening of the support portion 42. Projecting to the lower surface of the moving portion 41. Thus, the moving unit 41 is supported from below by the support roller 48 and can slide in the paper width direction S.
[0029]
One engaging pin 46, two fixing pins 42b, and two tension springs 44 are disposed at the center of each of the two pairs of side walls. The engagement pin 46 is supported so as to be movable in the paper width direction S by a long hole 42c formed in the center of the side wall. On both sides of the engaging pin 46, fixing pins 42b are fixed to the side walls. Both ends of the left and right tension springs 44 are respectively engaged with the engagement pin 46 and the fixing pin 42b, and the engagement pins 46 are pulled in opposite directions. An end portion 46 b of each engagement pin 46 protrudes from the side wall and is locked to a locking portion 41 a protruding from the lower surface of the moving portion 41. Regardless of which side of the sheet width direction the moving part 41 slides, the left and right pulling forces are out of balance and automatically return to the neutral position.
[0030]
In the width guide 50, the upper and lower ends of the guide plates 52 arranged in the paper feeding direction are supported so as to be movable in the paper width direction.
[0031]
Specifically, the upper and lower ends of each guide plate 52 are respectively coupled to the guide plate connecting portion 51. As shown in FIG. 8, a pair of guide bars 14 and 16 extending in parallel with each other in the paper width direction S are provided on the upper portion of the paper feeding device 10, and a sliding contact portion 54 provided on the guide plate connecting portion 51. The guide bars 14 and 16 are inserted into the slidable contact. The lower part of the paper feeding device 10 is configured similarly. As a result, the pair of width guides 50 are supported at both ends so as to be movable in the paper width direction, and can move parallel to the paper feed table 20 in a vertical direction.
[0032]
A guide driving mechanism for moving the width guide 50 is further provided on the upper portion of the apparatus 10. Specifically, the guide plate coupling portion 51 is provided with a belt fixing portion 56 and is coupled to a part of the guide drive belt 88. The guide drive belt 88 is a toothed belt and is hung on gears 83 and 84 arranged in the paper width direction S. Further, a transmission belt 86 which is a toothed belt is hung between a gear 82 provided coaxially with one of the pair of gears 83, 84 and a gear 80 provided coaxially with the operation dial 58. Then, for example, as indicated by arrows 90a, 92a; 90b, 92b, when the operation dial 58 is rotated, the guide drive belt 88 is moved via the transmission belt 86, and the guide plate connecting portion 51 is, for example, indicated by a dotted line. Then, it moves along the guide bars 14 and 16 together with the guide drive belt 88. As a result, the width guide 50 moves in the sheet width direction S.
[0033]
Next, a paper feed platform lifting mechanism 70 that lifts and lowers the paper tray 20 will be described with reference to FIG.
[0034]
The paper feed table elevating mechanism 70 includes a motor 60, a chain 67, sprockets 65 and 66, and a spring 68. One end of the chain 67 is fixed to the paper cradle 20, extends upward from the paper cradle 20, meshes with a guide sprocket 66 provided above the upper limit position of the paper cradle 20, and extends downward. And the other end is always pulled upward by a spring 68. When the drive sprocket 65 is rotated by the motor 60 via the speed reduction mechanism (worm gear 62 and worm wheel 64), one end of the chain 67 is raised or lowered, thereby raising and lowering the paper tray 20.
[0035]
Next, the operation of the paper tray 20 will be described.
[0036]
The adjustment dial 58 is rotated so that the position of the pair of width guides 50 is adjusted to the sheet width, and the sheet is placed on the sheet feeding table 20. When a print start button (not shown) of the printing press P is pressed, the paper feed tray 20 is raised to a position where the uppermost paper on the paper feed tray 20 lifts the paper feed ring 12 slightly. Then, the paper feed ring 12 is rotated at an appropriate timing, and the paper is sent out one by one from the paper feed tray 20 and printed inside the printing press P.
[0037]
When the printing position is shifted with respect to the sheet, the operation dial 58 is operated to retract one of the width guides 50 from the sheet, and the sheet is pushed with the other width guide 50 to move the entire sheet in the width direction. Move to S. As a result, the position in the width direction of the sheet with respect to the plate cylinder changes, and the printing position can be adjusted.
[0038]
When the sheets are moved by the width guide 50 in this way, if the sheets stacked on the sheet feeding table 20 are somewhat heavy, the main sheet feeding table 30 of the sheet feeding table 20 has a frictional force between the sheet and the moving unit 31. Then, the urging force by the tension spring 34 is overcome, and the moving unit 31 moves in the sheet width direction S together with the sheet. On the other hand, if the sheet is light and the frictional force between the sheet and the moving unit 31 is small, the sheet slides on the moving unit 31 and only the sheet is pushed by the width guide 50 and moves, and the moving unit 31 remains stationary. It is. In any case, the sheet can be moved in the width direction by the width guide 50.
[0039]
When the moving part 31 moves integrally with the sheet pushed by the width guide 50, the moving part 31 is displaced from the neutral position, and therefore, the tension spring 34 receives an urging force opposite to the moving direction. When the paper on the paper feed tray 20 decreases and the frictional force between the paper and the moving unit 31 decreases, the urging force by the tension spring 34 overcomes the frictional force between the paper and the moving unit 31 and attaches the moving unit 31. And return to the neutral position. Even when the width guide 50 that pushes the paper is retracted from the paper, the moving unit 31 of the paper feed table similarly returns to the neutral position.
[0040]
When the paper size is large, the paper is also stacked on the auxiliary paper feed tray 40, and the moving unit 41 of the auxiliary paper feed tray 40 operates in the same manner as described above.
[0041]
As described above, the sheet feeding device 10 can adjust the position of the sheet in the width direction with a simple configuration.
[0042]
In addition, this invention is not limited to the said embodiment, It can implement in another various aspect. For example, the present invention is not limited to a rotary stencil printing press and can be widely applied to paper feeding apparatuses in various fields. The present invention is particularly suitable for a large-capacity type paper feeding device, but application thereof is not limited thereto.
[Brief description of the drawings]
FIG. 1 is a front view of a main part of a conventional paper feeding apparatus.
FIG. 2 is a perspective view of a rotary stencil printing machine using a paper feeding device according to an embodiment of the present invention.
3 is an enlarged perspective view of a main part of the paper feeding device of FIG.
4 is an exploded perspective view of a main sheet feeding table of the sheet feeding device in FIG. 2. FIG. 5 is a cross-sectional view of the main sheet feeding table in FIG.
6 is an exploded perspective view of an auxiliary sheet feed stand of the sheet feed device of FIG. 2. FIG.
7 is a cross-sectional view of the auxiliary sheet feed table of FIG. 6;
FIG. 8 is an upper configuration diagram of the sheet feeding device of FIG. 2;
FIG. 9 is a configuration diagram of the paper feed table lifting mechanism of FIG. 2;
FIG. 10 is a configuration diagram of a main part of a modified example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Paper feeder 12 Paper feed ring 14, 16 Guide bar 20 Paper feed stand 22 Fixed part 28 Paper detection switch 30 Main paper feed stand 31 Moving part 31a Locking part 31b Through groove 32 Support part 32a Support shaft 32b Fixed pin 32c Long Hole 33 Support portion 33a Support shaft 34 Tension spring 36 Engagement pin 36a End portion 38 Support roller 40 Auxiliary paper feed table 41 Moving portion 42 Support portion 41a Locking portion 42a Support shaft 42b Fixed pin 42c Elongation hole 44 Pull spring 46 Engagement Pin 46b End 50 Width guide 51 Guide plate connecting portion 52 Guide plate 54 Sliding contact portion 56 Belt fixing portion 58 Operation dial 60 Motor 62 Worm gear 64 Worm wheel 65 Drive sprocket 66 Guide sprocket 67 Chain 68 Spring 70 Paper feed platform lifting mechanism 80 , 82, 83, 84 Gear 86 Transmission belt 88 Guide drive Belt P rotary stencil printing press S paper width direction

Claims (3)

The paper feed table (20) that is urged and supported so as to be movable in the paper width direction and capable of returning to the initial position, and the paper feed table (20) are erected in a substantially vertical direction so as to face the paper width direction. A sheet feeding device (10) including a guide plate (52) having a width equalized by the guide plate (52) and feeding the sheets stacked on the sheet feeding table (20) one by one.
The guide plate (52) are at least top or bottom in the vertical one above Symbol feeding table (20) is supported on the apparatus main body, movable in the sheet width direction without interfering with the feeding table (20) Composed of
When the sheet is moved in the sheet width direction by the guide plate (52), the sheet feeding table is configured to be movable integrally with the sheet by friction between the sheet and the sheet feeding table (20). A sheet feeding device characterized by that. A plurality of guide plates (52) are arranged in the paper feed direction.
  The said paper feed stand (20) is provided with the penetration groove | channel on the comb tooth which loosely fits with the said several guide plate (52) on the both sides of a paper width direction, The said groove | channel is provided. Paper feeder.   The paper feed table is disposed on a plurality of rollers arranged in the paper width direction,
  The sheet feeding device according to claim 1, wherein the sheet feeding device is biased and supported at the initial position by a balance of a plurality of springs arranged so as to face each other in the sheet width direction.

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