JP2016037371A - Paper feeding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple-structured and easy-to-use paper feeding apparatus capable of separating and feeding each paper sheet regardless of whether the paper sheets are single thin sheets or thick sheets which are stacked and bent.SOLUTION: A paper feeding apparatus comprises a paper feeding roller 2 and a separating member 29 which comes in pressure-contact with the paper feeding roller 2, a separation surface of the separating member 29 including a high friction part 29b and a low friction part 29a which is provided adjacent to the high friction part 29b and downstream of the high friction part 29b in a paper feeding direction. The separating member 29 is made approachable to and separable from a paper feeding roller 2, and the separation surface is tilted with respect to the approaching/separating direction. When the separation surface is in pressure-contact with the paper feeding roller 2, the high friction part 29b is included in the range of pressure-contact. When the separation surface is separated from the paper feeding roller 2 by a predetermined distance or more, a perpendicular line drawn from the center of the support shaft of the paper feeding roller 2 to the separation surface crosses the low friction part 29a.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a sheet feeding device that takes out and feeds sheets one by one from a single sheet or a bundle of a plurality of sheets in which one or a plurality of sheets are folded together.

  As a sheet feeding device that stacks and stacks a single sheet of paper, folded in half, or folded in four, and takes out only the first sheet, it is placed on the outer peripheral surface of a sheet feed roller formed of silicon rubber or the like. In many cases, a device in which a crust plate made of urethane rubber or the like is in pressure contact is used. For example, the apparatus of Patent Document 1 rotates a paper feed roller that is in pressure contact with the first sheet, and when the one sheet is fed out, the sheet is fed through between the sheet feed roller and the suction plate. At this time, even if the second and subsequent sheets are dragged forward, the feeding is prevented by the friction with the plate, so only the first sheet is separated and sent out.

JP 2010-163246 A (paragraphs [0044] and [FIG. 2]

  The apparatus of Patent Document 1 can separate and send out not only a single sheet of paper but also a thin sheet of about two folds or four folds by stacking with the last fold as the head. However, in the case of a thick sheet formed by bending a large number of sheets, the sheet cannot be passed between the sheet feeding roller and the suction plate that are in pressure contact with each other. Therefore, if the paper feed roller and the sheet plate are separated so that a gap corresponding to the passage of one sheet is opened, the sheet can be passed between them, but the friction force of the sheet plate is too strong and the leading edge of the sheet is deformed. This causes malfunctions. However, if the frictional force of the saw plate is reduced, when the thin sheet is separated and fed, it is impossible to prevent the second and subsequent sheets from moving forward, and double feeding occurs.

  The present invention has been made in view of such problems, and can separate and feed a thin sheet from a thin sheet to a thick sheet obtained by folding a plurality of sheets, and has a simple structure and operation. An object is to obtain a paper feeding device.

  In order to solve the above problems, a sheet feeding device according to an aspect of the present invention includes a storage unit that stores a plurality of sheets in a stacked bundle state, and one side in a stacking direction of the sheet bundle stored in the storage unit. A sheet feed roller that presses the leading edge of the sheet and rotates to feed only the first sheet, a pressurizing unit that presses the sheet bundle against the sheet feed roller, and a sheet feed roller. A sheet member placed and fed by the sheet feed roller between the sheet feed roller to prevent the second and subsequent sheets from being fed, and the sheet member against the sheet feed roller In the sheet feeding device, the sheet member includes a sheet member moving means for moving the sheet member so as to be pressed against and separated from each other, and the sheet member includes a high friction part and a high friction part. Than sheet feeding And a low friction portion having a lower friction coefficient than that of the high friction portion, and is provided to be inclined with respect to the moving direction by the sucking movement means. The high friction part is included in the pressure contact range, and when the surface is separated from the paper feed roller by a predetermined distance or more, the surface of the paper roller is supported from the support shaft center. The sheet feeding device is characterized in that a high friction portion and a low friction portion are arranged so that a perpendicular line dropped to the low friction portion intersects the low friction portion.

  According to this aspect, when a thick sheet is applied, the position where the perpendicular line dropped from the center of the paper feed roller to the surface of the surface becomes intersected with the surface, that is, before the position where the sheet is sandwiched by the highest pressure, Since the friction part is switched to the low friction part, the influence of the braking force of the high friction part on the fed sheet can be suppressed. Therefore, it is possible to smoothly separate one by one without deforming the tip. In addition, since the high friction portion is included in the pressure contact range when the surface is in pressure contact with the paper feed roller, the high friction portion and the paper feed roller that are in pressure contact with each other even when a thin sheet is applied. Can be reliably separated one by one.

  A support plate that has an inclined surface that is inclined parallel to the surface, and that supports the surface member on the surface side of the inclined surface, and a locking surface that is parallel to the inclined surface with a gap from the back surface side of the inclined surface. And the support plate is fixed at the upstream end of the inclined surface in the sheet feeding direction with a predetermined gap to the downstream surface, while the supporting plate is downstream of the inclined surface in the sheet feeding direction. The side is configured as a free end, and may be configured to be deformed with the pressure contact between the paper feed roller and the buckling member, and at least a part of the side may be in contact with the locking surface during the deformation. According to this aspect, since the pressure and impact applied to the saw bed can be reduced, the durability of the apparatus is improved.

  When the moving surface is moved in a direction to bring the surface closer to the paper feed roller, the position where the surface and the paper feed roller first contact each other may be a high friction portion, or the high friction portion and the low friction portion. It may be substantially coincident with the boundary with the part. Further, a step may be formed between the low friction portion and the high friction portion so that the surface of the high friction portion is closer to the paper feed roller than the low friction portion. According to this aspect, a material softer than the low friction part is applied to the high friction part, and even if the high friction part is worn, the sheet is not caught on the boundary between the high friction part and the low friction part.

  According to the present invention, it is possible to separate and feed a thin sheet from a thin sheet to a thick sheet obtained by folding a plurality of sheets, and it is possible to obtain a sheet feeding device having a simple structure and operation.

1 is a front view showing a paper feeding device 1 according to an embodiment of the present invention. 1 is a top view illustrating a sheet feeding device 1 according to an embodiment of the present invention. It is the side view which looked at the paper feeder 1 which concerns on embodiment of this invention from the right side of FIG. It is the side view which looked at the state which the lever 11 has become a release position from the same direction as FIG. 1 is a front view showing a sheet feeding device 1 according to an embodiment of the present invention, showing a shaft 25 omitted in FIG. 1 and its peripheral members, and a front view in which members disposed on the back side thereof are omitted. It is. It is the figure which removed the pressurization board 7, the expansion-contraction mechanism 9, and the mounting board 13 from FIG. 2, and showed the member below it. It is a figure which shows the shafts 22 and 25 and its peripheral member seen from the back side. FIG. 4 is an enlarged view showing a part of a paper feed roller 2, a separator member 29, a separator stand 30, and a separator position adjusting mechanism 31. FIG. 4 is an enlarged view showing a configuration of a facing portion between a sheet feeding roller 2 and a separating member 29. FIG. 10 is a diagram illustrating another example of a facing portion between the sheet feeding roller 2 and the separating member 29. FIG. 10 is a diagram showing still another example of a facing portion between the paper feed roller 2 and the separating member 29. It is a figure which shows one modification of this invention. 4 is an enlarged view of a peripheral portion of a cam 42. FIG. 6 is a diagram illustrating an operation of stacking sheets S. FIG. 6 is a diagram illustrating an operation of stacking sheets S. FIG. 6 is a diagram illustrating an operation of stacking sheets S. FIG. FIG. 10 is a view showing the vicinity of the tip on one side when a thin sheet S is stacked with the lever 11 in a released state.

(First embodiment)
Embodiments of the present invention will be described with reference to the drawings. In the present invention, “sheet” includes not only one sheet of paper but also a sheet of one sheet folded or a plurality of sheets folded together. In the case of a sheet including a crease, “one sheet” refers to a unit that can be separated one by one without opening the final fold. For example, when a plurality of sheets are folded into four, such as a newspaper, one copy of the newspaper after the four folding is referred to as “one sheet”.

  FIG. 1 is a front view showing a paper feeding device 1 according to an embodiment of the present invention, FIG. 2 is a top view thereof, and FIG. 3 is a side view seen from the right side of FIG.

  As shown in FIG. 1, a paper feed roller 2 is disposed at the left end of the paper feeder 1 in FIG. The paper feed roller 2 is fixedly supported by the paper feed shaft 3, and one is provided at the approximate center of the paper feed device 1 in the axial direction of the paper feed shaft 3 (the horizontal direction in FIG. 2, hereinafter referred to as “width direction”). It has been.

  The sheet feeding shaft 3 is rotatably supported by the side plates 4 and 5 at both ends in the width direction. The side plates 4 and 5 form a U-shape along with the back plate 6 at the right end in FIG. 1, and an accommodating portion for accommodating the bundle S0 of sheets S is formed inside the U-shape. In FIG. 1, the front side plate 4 is omitted so that the internal structure can be easily understood.

  The sheet bundle S0 is arranged vertically so as to lean against the pressure plate 7 that is slightly inclined with respect to the plane perpendicular to the horizontal plane. The pressure plate 7 is placed on the other side (in the stacking direction of the sheet bundle S0) so that one side of the stacked sheet bundle S0 in the sheet stacking direction (left side in FIG. The surface of the right side of FIG. 1 (hereinafter also simply referred to as the other side) is pressed toward one side.

  An X-shaped expansion / contraction mechanism 9 is arranged between the pressure plate 7 and the back plate 6. The expansion / contraction mechanism 9 is connected to a support plate 9 a fixed to the pressure plate 7, a first link 9 c connected to be rotatable about an upper end shaft 9 b, and a support plate 9 d fixed to the back plate 6. On the other hand, the second link 9f connected to be rotatable about the shaft 9e at the upper end intersects in an X shape. A shaft 9g that supports both the first link 9c and the second link 9f is provided at the intersection. A shaft 9h is supported at the lower end of the first link 9c, and the shaft 9h is inserted through a long hole 9i formed below the support plate 9d. A shaft 9j is supported at the lower end of the second link 9f, and the shaft 9j is inserted through a long hole 9k formed in the support plate 9a.

  The support plate 9a, the shaft 9b, the first link 9c, the support plate 9d, the shaft 9e, and the second link 9f are provided one by one apart in the width direction, a total of two, and the shafts 9g, 9j, 9h One is provided through each so as to connect.

  The vicinity of the upper end of the second link 9f is inserted into a slit 6a formed in the back plate 6, and the upper end 9m protrudes on the side opposite to the sheet bundle housing portion of the back plate 6 (hereinafter referred to as the back side). Two upper ends 9m of the second links 9f arranged in the width direction are connected by a shaft 9n. One end of the spring 10 is hung at the center of the shaft 9n in the width direction, and the other end of the spring 10 is hung on the support shaft 11a of the lever 11. The lever 11 is supported so as to be rotatable about a fulcrum shaft 11b, and the lever 11 is rotated by moving the grip portion 11c up and down by hand.

  The lever 11 can be switched between an upper release position and a pressure position lowered downward. 1 to 3, the lever 11 is in a pressurized state. FIG. 4 is a side view of the lever 11 in the release position as viewed from the same direction as FIG. As shown in FIGS. 15 and 4, the lever 11 is inserted into a slit 12 a that is elongated in the vertical direction in a locking plate 12 provided on the back surface of the back plate 6. The slit 12a has a wide lower width and a narrow upper width, with the step 12b in the middle.

  The lever 11 in the release position is pulled up by the spring 10 and is in contact with the upper end 12 c of the slit 12. From this state, the lever 11 stops at the pressurizing position by pushing down the gripping portion 11c and locking it to the step 12b. Then, since the upper end 9m of the second link 9f is pulled downward by the tensile force of the spring 10, the second link 9f exerts a force that rotates about the shaft 9e in the clockwise direction in FIG. Then, a force in a direction to separate the back plate 6 and the pressure plate 7 from each other acts on the entire expansion mechanism 9, and as a result, the pressure plate 7 presses the sheet bundle S 0 toward the paper feed roller 2.

  When the lever 11 is set to the release position, the spring 10 is contracted, so that the force for separating the back plate 6 and the pressure plate 7 hardly acts on the expansion / contraction mechanism 9, and the pressure plate 7 comes close to the back plate 6.

  A placement plate 13 that supports the sheet bundle S0 is provided below the sheet bundle S0. The upper surface of the mounting plate 13 forms a gentle gradient so as to become lower as it is closer to the paper feed roller 2. The long holes 9i and 9k are formed so that the pressing plate 7 moves along the gradient of the mounting plate 13 by the expansion / contraction mechanism 9.

  As shown in FIGS. 3 and 4, when the lever 11 is pushed down, the lower side of the lever 11 comes into contact with the column 16 on the way. When the lever 11 is further pushed down, the column 16 is also moved downward. The pillar 16 is erected on the gear plate 17, and two pillars 18 that are erected on the back plate 6 are inserted into two elongated holes 17 a formed in the gear plate 17. Therefore, when the pillar 16 is pushed down, the gear plate 17 moves downward along the direction in which the long hole 17a is formed.

  A spring 21 is hung between a column 19 standing near the lower end of the gear plate 17 and a column 20 standing near the lower end of the locking plate 12. When the lever 11 is in the release position, the gear plate 17 is biased upward by the spring 21, so that it stops at the position where the lower end of the elongated hole 17 a abuts the column 18. When the lever 11 is in the pressurizing position, the gear plate 17 is pushed down against the bias of the spring 21 together with the column 16.

  Below the left side of the gear plate 17 shown in FIGS. 3 and 4, there is a gear portion 17 b formed with a rack gear, and this gear portion 17 b meshes with a gear 23 fixedly supported on the shaft 22. When the lever 11 is pushed down from the release position to the pressure position, the gear portion 17b is also pushed down, and the gear 23 rotates clockwise as shown in FIGS. The displacement of the gear plate 17 at this time and the quarter of the circumference of the pitch circle of the gear 23 are configured to be the same. That is, when the lever 11 is pushed down from the release position to the pressure position, the gear 23 and the shaft 22 are rotated by 90 °.

  The shaft 25 is symmetrically arranged with respect to the shaft 22 across the center in the width direction of the sheet feeding device 1, and is connected to the shaft 22 by a link mechanism 24. The link mechanism 24 includes link members 24a and 24b fixedly supported in the same direction from the shafts 22 and 25, and rods 24c whose both ends are rotatably connected to the link members 24a and 24b, respectively. With this configuration, the shaft 25 is configured to rotate in the same direction as the shaft 22 by the same rotation amount.

  The shafts 22 and 25 are supported by the back plate 6 and extend below the sheet bundle S0. In FIG. 1, with respect to the shaft 25 and its peripheral members, a portion closer to the sheet bundle housing portion than the back plate 6 is omitted in order to make it easier to see the members disposed on the far side. FIG. 5 shows the omitted part and omits the member arranged on the back side. FIG. 6 is a view showing members below the pressure plate 2, the expansion / contraction mechanism 9, and the placement plate 13 from FIG. 2, and the position of the placement plate 13 is indicated by a one-dot chain line. The shafts 22 and 25 and their peripheral members will be described with reference to FIGS.

  The shafts 22 and 25 extend to the vicinity of the mounting plate 13 bent downward in the vicinity of the paper feed roller 2, and are supported by a support plate 26 standing on the support base 15. An L-shaped second locking member 27 is fixed to one side of the shafts 22 and 25 in the sheet stacking direction. The second locking member 27 is a member obtained by bending a plate-like member into an L shape, a first portion parallel to the axial direction of the shafts 22 and 25, and a second portion that rises downward at a right angle from one end of the portion. And have. A support surface 27a is formed on the surface of the first portion opposite to the shafts 22 and 25, and a locking surface 27b is formed on the inner surface of the second portion.

  Further, adjacent to the other side of the second locking member 27 in the sheet stacking direction, the first locking member 28 is attached to the shafts 22 and 25 in the same direction as the second locking member 27 in the circumferential direction. It has been. The first locking member 28 is a member obtained by bending a plate-like member into a U-shape, and includes a first portion parallel to the axial direction of the shafts 22 and 25, and a first portion that stands vertically downward from both ends of the portion. And has two parts. Locking surfaces 28b and 28c are formed on the other surface of the second portion.

  5 and 6 both show the state in which the lever 11 is in the pressurizing position. As shown in FIGS. 5 and 6, when the lever 11 is in a pressurized state, both the first locking member 28 and the second locking member 27 are on the left side shown in FIG. positioned. FIG. 7 is a view showing the shafts 22 and 25 and their peripheral members as seen from the back side. FIG. 7A shows a state in which the lever 11 is in the pressurizing position, and FIG. Indicates a certain state. When the lever 11 is switched from the pressurization position to the release position, the gear plate 17 rises, and the gear 23 engaged with the gear portion 17b rotates 90 ° counterclockwise in the figure. Then, the shaft 22 that supports the gear 23 and the shaft 25 connected to the shaft 22 by the link mechanism 24 both rotate 90 ° counterclockwise. Then, the state shown in FIG. 7A is changed to the state shown in FIG. That is, the first locking member 28 and the second locking member 27 move upward from the right side of the shafts 22 and 25 in the figure.

  When the lever 11 is switched from the release position to the pressurization position, the gear plate 17 descends, the gear 23 engaged with the gear portion 17b rotates 90 ° in the clockwise direction in the figure, and the shafts 22 and 25 also rotate 90 ° in the clockwise direction. To do. Then, the state of FIG. 7B returns to the state of FIG. That is, the first locking member 28 and the second locking member 27 move from the upper side of the shafts 22 and 25 to the right side in the figure. Thus, when the lever 11 is in the pressure position, the first locking member 28 and the second locking member 27 are on the right side of the shafts 22 and 25, and when the lever 11 is in the release position, The first locking member 28 and the second locking member 27 are on the upper side of the shafts 22 and 25 in the figure, and the locking surfaces 27b, 28b, and 28c are configured to rise upward.

  As shown in FIG. 1, a buckling member 29 is disposed diagonally below the paper feed roller 2 so as to face the outer peripheral surface thereof. The surface member is fixed to the surface plate 30. The rust board 30 extends below the mounting table 13 through a slit (not shown) formed in a portion bent below the mounting plate 13. The expansion position adjusting mechanism 31 is provided in the extended portion.

  FIG. 8 is an enlarged view showing a part of the paper feed roller 2, the separator member 29, the separator stand 30, and the separator position adjusting mechanism 31, and FIG. 8A shows that a plurality of sheets are bent together. FIG. 8B is a diagram when a single sheet is applied as the sheet S. FIG.

  This will be described below with reference to FIGS. The saw bed 30 includes a mounting portion 30b formed horizontally and a saw support portion 30a bent obliquely downward from the mounting portion 30b. A surface member 29a is affixed to the outer surface of the surface member 30a, and the surface member 29 is disposed opposite to the outer peripheral surface of the paper feed roller 2. A screw block 31 is fixed to the lower surface of the mounting portion 30b. A screw shaft 32 held by a bracket 33 attached to the support base 15 passes through the screw block 31, and the female screw of the screw block 31 and the screw shaft 32 are screwed together at this through portion. A slit 33a is formed in the bracket 33, and the screw block 31 is inserted through the slit 33a. With this configuration, when the screw shaft 32 rotates, the screw block 31 moves in the horizontal direction along with the slit member 29 and the paddle base 30 along the slit 33a.

  A bevel gear 34 is fixedly supported at the end of the screw shaft 32. The bevel gear 34 meshes with a bevel gear 36 fixedly supported by a drive shaft 35 disposed in a direction orthogonal to the screw shaft 32. The drive shaft 35 is supported by the bracket 37 attached to the support base 15 and the side plate 4, and extends to the outside of the side plate 4. A wheel 38 is fixedly supported on the drive shaft 35 outside the side plate 4. By rotating the wheel 38 by hand, the drive shaft 35 and the screw shaft 32 are rotated. Therefore, the position of the buckling member 29 can be adjusted by moving it horizontally.

  FIGS. 9A and 9B are enlarged views of the facing portion between the paper feed roller 2 and the buckling member 29 in FIGS. 8A and 8B, respectively. A surface member 29 is affixed to the surface of the surface portion 30b of the surface plate 30 that faces the paper feed roller 2. The lower member 29 is provided with a low friction portion 29a, a high friction portion 29b, and an inclined portion 29c from the downstream side. The surface of the surface member 20 facing the paper feed roller 2 (hereinafter referred to as the surface surface) is a smooth surface with a small coefficient of friction in the low friction part 29a. For example, a smooth metal surface, a surface treated to form a smooth surface (electroless nickel plating, etc.), and a surface formed by smoothing the surface of a resin material (polyacetal, nylon, etc.) with good sliding properties. . The surface of the high friction portion 29b is formed to have a higher friction coefficient than the low friction portion 29a. For example, it is made of urethane rubber, silicon rubber or the like. The inclined portion 29c is formed of a member that is slippery so as to smoothly feed the sheet S between the surface and the outer peripheral surface of the paper feed roller 2. For example, it is made of the same material as the low friction part 29a.

  As shown in FIG. 9A, when a thick sheet S (for example, a newspaper in which a plurality of sheets are folded together) is applied, the wheel 38 (see FIGS. 6 and 7) is turned in advance, and the saw bed 30 is placed in FIG. The sheet S is moved in the right direction, and a gap between the surface and the outer peripheral surface of the paper feed roller 2 is opened so that only one sheet S can pass. When the sheet bundle S0 is pressed against the outer peripheral surface of the sheet feeding roller 2 by the pressure plate 7 and the sheet feeding roller 2 is rotated in the clockwise direction in FIG. 9, the first sheet S (the leftmost side in the drawing) is sent out by frictional force. It is. Then, it passes between the surface and the paper feed roller 2 and is sent downstream.

  At this time, even if the next sheet S is dragged, there is originally only a gap for one sheet, so the next sheet S together with the first sheet S is fed with the paper feed roller 2 and the separating member 29. It is difficult to enter between. Even if it enters, the high friction part 29b prevents further advancement. The frictional force acting between the sheet S and the sheet S when the sheet S is sandwiched between the sheet feeding roller 2 and the separating member 29 is smaller than the frictional force between the outer peripheral surface of the sheet feeding roller 2 and the sheet S. However, a material that is larger than the frictional force between the sheets S is used for the outer peripheral surface of the paper feed roller 2 and the high friction portion 29b.

  For this reason, the braking force of the high friction portion 29b works not only on the next sheet S but also on the first sheet S. For the first sheet S, a feeding force acts on the paper feed roller 2 side, and a force for preventing the feeding acts on the high friction surface 29b side. Therefore, if the surface member 29 is formed only of the high friction portion, the leading edge of the earliest sheet S may be deformed. In particular, when a final folded surface obtained by folding a plurality of sheets of paper together like a newspaper is fed as a leading edge, a force is exerted to feed only the paper on the paper feed roller 2 side. The tip ends its final fold.

  However, in the present embodiment, the low friction portion 29a is provided on the downstream side of the high friction portion 29b, and the perpendicular Z drawn from the center of the paper feed shaft 3 to the buckling member 29 intersects with the low friction portion 29a. ing. Therefore, before the leading edge of the sheet S reaches the perpendicular, it passes through the position where the high friction portion 29b is switched to the low friction portion 29a, so that the influence of the braking force of the high friction portion 29b on the first sheet S can be suppressed. This is because when the leading edge of the sheet S reaches the position where the surface of the surface and the perpendicular intersect, that is, the position where the sheet S is sandwiched with the highest pressure, the low friction portion 29a has already been reached. Advancement of the next sheet S is reliably prevented by the high friction portion 29b before the leading end of the sheet S reaches the low friction portion 29a. Therefore, it is possible to smoothly separate one by one without deforming the tip.

  As shown in FIG. 9B, for example, when a thin sheet S such as one sheet of paper is applied, the wheel 38 (see FIGS. 6 and 7) is turned in advance to move the saw bed 30 to the left in FIG. The surface is pressed against the paper feed roller 2. When the sheet bundle S0 is pressed against the sheet feeding roller 2 by the pressure plate 7 and the sheet feeding roller 2 is rotated in the clockwise direction in FIG. 9, the first sheet S is sent out by frictional force. Then, it passes between the surface and the outer peripheral surface of the paper feed roller 2 and is sent downstream.

  At this time, even if the next sheet S is dragged, further advancement is prevented by the high friction portion 29b. In the case of a thin sheet S, the next sheet S is more likely to enter the downstream side than in the case of a thick sheet. In the present embodiment, in the state where the outer member 29 and the outer peripheral surface of the paper feed roller 2 are in pressure contact, the perpendicular line Z dropped from the center of the paper feed shaft 3 to the lower member 29 is the low friction part 29a and the high friction part 29b. It almost coincides with the boundary. Therefore, when the surface is moved in the direction approaching the paper feed roller, the position where the surface and the paper feed roller first contact each other substantially coincides with the boundary between the high friction portion and the low friction portion. Further, when the surface is pressed against the paper feed roller, it surely includes the high friction portion, so that the braking force of the high friction portion 29b acts to the position where the paper feed roller 2 is closest to the surface. Therefore, even if the next sheet S enters a relatively downstream side, it can be prevented from moving forward.

  The surface plate 30 is bent obliquely downward from a horizontally formed mounting portion 30b to form a surface support portion 30a. The saw bed 30 moves the mounting portion 30b in the horizontal direction, and presses and separates the buckling surface and the paper feed roller 2. Since the surface is inclined with respect to the direction of pressure contact and separation, the surface is lowered from the paper feed shaft 3 to the surface when the surface is pressed against the paper feed roller 2 and when it is separated from the paper feed roller 2. The perpendicular line is shifted in the paper feeding direction. The amount of shift per horizontal movement amount of the saw bed 30 increases as the inclination decreases, but on the other hand, the pressure contact force between the sheet feed roller 2 and the saw plate 29 is reduced, and the sheet during feeding is reduced. The curvature of S becomes large, so that it is fed out and the resistance becomes large. The inclination angle α of the surface of the surface relative to the moving direction of the surface 30 is preferably an appropriate angle in consideration of the both, and is preferably in the range of 40 to 80 °. In the present embodiment, the angle is set to 60 °.

  Since this embodiment is configured as described above, the braking force of the high friction portion 29b can be suppressed in the case of the thick sheet S, and the high friction portion 29b exists further downstream in the case of the thin sheet S. The next sheet S can be reliably prevented. Therefore, it is possible to obtain a sheet feeding device that can be reliably separated from a thin one to a thick one by only an operation of bringing the separating member 29 into contact with and separating from the sheet feeding roller 2.

  The high friction portion 29b formed of urethane rubber or silicon rubber is more easily worn than the low friction portion 29a formed of a metal surface or a resin surface. If there is no step between the low friction part 29a and the high friction part 29b and the low friction part 29b wears faster than the high friction part 29a, the high friction part 29a downstream of the low friction part 29b The leading edge of the sheet S is caught at the boundary. However, in the present embodiment, the high friction portion 29b and the low friction portion 29a are positioned such that the low friction portion 29a is located farther from the paper feed roller 2 than the high friction portion 29b. Since the step is formed between the sheets, the sheet S can be fed out without being caught even if the high friction portion 29b is worn faster.

  When the material of the high friction portion 29a which is hard to wear is selected such as urethane rubber having high hardness, the above step is not necessarily required. Therefore, as shown in FIG. 10, the low friction portion 29a and the high friction portion 29b can be configured to have the same surface.

  Further, as shown in FIG. 11, when the surface and the paper feed roller 2 are brought into pressure contact, the perpendicular Z dropped from the paper feed shaft 3 may intersect with the high friction part 29b. Even with this configuration, in the case of the thick sheet S, the leading edge of the sheet S is switched to the low friction portion 29a before reaching the perpendicular line Z, so that the leading edge can be prevented from being deformed. In the case of a thin sheet S, if the surface is moved in the direction approaching the paper feed roller, the position where the surface comes into contact with the paper feed roller first becomes the high friction portion 29b, and the high friction portion 29b is used as it is. Pressure contact. Then, in the case of the thin sheet S, a sufficient separation effect can be obtained because the tip is still in contact with the high friction portion 29b even at the position where the tip reaches the perpendicular line Z. In the configuration of FIG. 11, the vertical line Z coincides with the boundary between the low friction part 29 a and the high friction part 29 b at a position where the surface surface is separated from the paper feed roller 2 by a predetermined distance, and when the separation line is further separated, the vertical line Z is low friction. Crosses the portion 29a. The predetermined distance is desirably about 0.5 mm.

  FIG. 12 is a view showing a modified example, and a support plate 51 is interposed between the saw bed 30 and the saw member 29. The support plate 51 is formed with a mounting portion 51b that is a horizontal portion, and a buckle support portion 51a that is bent downwardly from the mounting portion 51b at the same angle as that of the base plate 51, similarly to the base plate 30. Yes. The mounting portion 51b is fixed so as to overlap the upper surface of the mounting portion 30b of the saw bed 30. The surface support 51a is in a state of being lifted from the surface 30 with a gap in the thickness direction with respect to the surface 30. The surface member 29 is affixed to the surface of the surface support 51a facing the paper feed roller 2. The support plate 51 is a deformable plate material that is thinner than the saw bed 30 and is preferably a plate spring material having elasticity. For example, it is formed of a leaf spring material having a thickness of 0.6 mm.

  According to the configuration of FIG. 12, when the buckling member 29 and the paper feeding roller 2 are pressed against each other, the support plate 51 is deformed and the end on the downstream side in the paper feeding direction comes into contact with the buckling board 30. However, the upstream end of the paper support 51a in the paper feeding direction is maintained in a state where a gap is opened with respect to the paper board 30. Therefore, the support plate 51 is deformed so as to be closer to the buckling table 30 toward the downstream side in the sheet feeding direction. FIG. 12A shows a form before deformation, and when the sucker member 29 is further moved leftward from the state shown in FIG. 12A, the state shown in FIG. 12B is obtained. As shown in FIG. 12B, after deformation, both the support plate 51 and the high friction portion 29 b of the buckling member 29 are shaped to follow the outer peripheral surface of the paper feed roller 2. Accordingly, since the contact length between the high friction portion 29b and the paper feed roller 2 can be made relatively long with a relatively light pressure contact force, the lighter brake is applied to the sheet S passing between them than in the embodiment of FIG. Force can be applied for a long time. Therefore, there is an advantage that an equivalent separation performance can be obtained with a lighter load than the embodiment of FIG. Further, since the support plate 51 also functions as a buffer member that reduces the load applied to the surface plate 30 when the paper feed roller 2 and the surface member 29 are pressed against each other, the deformation of the surface plate 30 can be prevented. Can increase the durability.

  Further, when the thick sheet S is fed by the sheet feeding device in the form shown in FIG. 12, the sheet feeding roller 2 and the separating member 29 are previously separated from each other. In this state, the sheeting roller 29 is brought into contact with the sheet feeding roller 2. Since no pressure is applied, the support plate 51 is in a state before deformation. The support plate 51 is deformed when the sheet S enters between the paper feed roller 2 and the buckling member 29. If the support plate 51 is not present, the shock plate 30 directly receives the impact. Therefore, the support plate 51 also functions as a buffer member that reduces the impact on the saw bed 30 when the sheet S enters. Therefore, also in this case, the deformation of the saw bed 30 can be prevented, and the durability of the apparatus can be increased.

  The form shown in FIG. 12 is the same as the form of FIG. 9 in the shape of the surface member 29 and the positional relationship with the perpendicular Z, but may be formed in the same form as in FIG.

  Returning to FIG. 1 and FIG. A paper feed shaft 3 that supports the paper feed roller 2 is supported by side plates 4 and 5. Outside the side plate 4, it is drivingly connected to a motor M via a toothed belt 39. The motor M can be intermittently driven and intermittently drives the paper feed shaft 3 to rotate. After the leading edge of the sheet S is added to a pair of rollers (not shown) that is constantly driven to rotate provided on the downstream side of the sheet feed roller 2, the motor M stops. A one-way clutch is interposed between the sheet feeding roller 2 and the sheet feeding shaft 3, and the sheet feeding roller 2 is driven to rotate with respect to the sheet S fed by a pair of rollers (not shown) even after the motor M is stopped. . When the trailing edge of the sheet S passes through the sheet feeding roller 2, the sheet feeding roller 2 stops. When the motor M starts to drive again, the feeding of the next sheet S is started. This operation is repeated so that the sheets S are sequentially and repeatedly sent out.

  Outside the side plate 5, rotation is transmitted to the camshaft 41 via the toothed belt 40. A cam 42 is supported on the cam shaft 41 by a fixed shaft, and the cam shaft 41 is supported between a side plate 5 and the cam 42 by a bracket 43 mounted on a support base 15, and the cam shaft 41 is supported horizontally. .

  Above the cam 42, a bracket 44 is attached to the lower surface of the mounting plate 13, and a cam follower shaft 45 supported by the bracket 44 is in contact with the outer peripheral surface of the cam 42.

  FIG. 13 is an enlarged view of the peripheral portion of the cam 42. The cam 42 is provided with four large-diameter portions 42a every 90 ° in the circumferential direction, and a small-diameter portion 42b is formed adjacent to the large-diameter portion 42a in the counterclockwise direction. The outer diameter is gradually increased counterclockwise from the small diameter portion 42b and connected to the next large diameter portion 42a. In a state where the cam follower shaft 45 is in contact with the small diameter portion 42b, the mounting plate 13 is formed to be slightly inclined with respect to the horizontal plane. This inclination promotes the movement of the sheet S in the direction of the sheet feed roller 2 as the sheet feeding progresses. However, if the inclination is excessively increased, the stacking amount of the sheet S is reduced, and therefore, about 1 to 10 °. Is desirable. In this embodiment, the angle is 2 °.

  When the paper supply roller 2 rotates, the cam shaft 41 rotates in the same direction by the toothed belt 40. Then, the cam 42 rotates in the clockwise direction in FIG. Then, the cam follower shaft 45 rises along the outer periphery of the cam 42 that gradually increases in outer diameter from the small diameter portion 42b to the large diameter portion 42a, and then suddenly descends through the large diameter portion 42a to reach the small diameter portion 42b again. Accordingly, the mounting plate 13 moves up and down in the same manner. At this time, the mounting plate 13 is lifted on the side close to the right end, which is a free end, with the left end of FIG. That is, the sheet is deformed so that the inclination increases toward the other side in the sheet stacking direction, and then quickly returns to the original. By this operation, vibration is generated in the mounting plate 13 and the inclination is temporarily increased by the deformation of the mounting plate 13, so that the movement of the sheet S in the direction of the paper feed roller 2 is urged. Therefore, even if the inclination of the mounting plate 13 is relatively small, the sheet S can be reliably sent out without being idle fed. If the vibration is excessively large, the sheets S may be damaged or the stacking may be disturbed. Therefore, the displacement of the cam follower shaft 45 is preferably about 0.5 to 3 mm. In this embodiment, it is 0.8 mm.

  In addition, the mounting surface of the mounting plate 13 before the deformation may be horizontal. Even if the mounting plate 13 is horizontal, it can be tilted by deformation, so that the sheet S can be moved in the direction approaching the paper feed roller 2 in cooperation with the pressing force of the pressure plate 7.

  In the present embodiment, the cam 42 is configured to rotate once every time the sheet feeding shaft 3 rotates one time. Therefore, after the mounting plate 13 is deformed so that the inclination is increased, the returning operation is periodically repeated four times during one rotation of the paper feed roller 2. The amount of rotation of the paper feed roller 2 is set so that the loading plate 13 is deformed at least once each time a sheet is fed, and preferably at least twice periodically. Has been. With this configuration, it is possible to vibrate the placement plate 13 that should promote the movement of the sheet S to one side in the stacking direction each time the sheet is repeatedly sent out.

  Note that the present invention is not limited to a mechanism that links the operation of the paper feed shaft 3 and the cam 42. For example, the cam 42 may be driven by a drive source other than the paper feed shaft 3. In this case, it may be controlled so that the cam 42 operates every time a sheet is sent out, or the cam 42 may be operated every time a predetermined number of sheets are sent out.

  The operation of stacking sheets S on the sheet feeding device 1 configured as described above will be described with reference to FIGS. 14 to 16 and other drawings as appropriate. FIG. 14 shows a state where the sheet S is not stacked on the placing plate 13 and the lever 11 is in the release position. Due to the tensile force of the spring 10, the pressure plate 7 is located close to the back plate 6. Further, both the first locking member 28 and the second locking member 27 are located above the shafts 22 and 25, and the locking surfaces 27 b, 28 b and 28 c protrude above the mounting plate 13. . At this time, one side in the sheet stacking direction with respect to the pressure plate 7 is an accommodating portion capable of accommodating the sheet S.

  In this state, as shown in FIG. 15, the sheet bundle S0 is stacked twice. First, the sheet bundle S0a is stacked, and then the sheet bundle S0b is stacked. When the sheet bundle S0a is stacked, the leading end of the sheet S on the most one side (the left side in the drawing) is brought into contact with and locked with the locking surface 28b of the first locking member 28. Therefore, even when the mounting plate 13 is inclined, the standing posture is maintained without the sheet bundle S0a slipping and being disturbed.

  Subsequently, as shown in FIG. 16, the sheet bundle S0b is stacked on an empty portion on one side of the sheet bundle S0a. Then, the leading end of the one side of the sheet bundle S0b comes into contact with and is locked with the locking surface 27b of the second locking member 27. Therefore, it is possible to prevent the first sheet S from entering between the sheet feeding roller 2 and the separating member 29. When the sheet S is thin, as shown in FIG. 17, some of the foremost sheets S are received by the support surface 27 a at one end of the placement plate 13. Therefore, the thin sheet S can be supported in the vicinity of the paper feed roller 2 even if the end of the one side of the placement plate 13 and the paper feed roller 2 are separated so that the thick sheet S passes.

  Thereafter, when the lever 11 is pushed down to the pressurizing position, the gear plate 17 is also pushed down as shown in FIGS. 3 and 4, and the gear portion 17b rotates the gear 23 by 90 °, so that the shaft 22 rotates by 90 °. . Further, the shaft 25 is also rotated by 90 ° by the link mechanism 24. Then, as shown in FIG. 5, both the first locking member 28 and the second locking member 27 are positioned on the sides of the shafts 22 and 25. Then, since both the first locking member 28 and the second locking member 27 are separated from the sheet S, the earliest sheet S is guided between the sheet feeding roller 2 and the suction member 29, and the sheet is advanced as the sheet feeding progresses. S can be sequentially moved to one side.

  In this way, since the sheets S that can be stored in the storage section can be stacked in multiple times, even large heavy sheets can be stacked easily and stored without impairing usability. The loading capacity of the parts can be increased.

  In the present embodiment, the application and release of the applied pressure by the pressure plate 7 is performed by the manual lever 11, but the present invention is not limited to this mode, and it is automatically performed using a drive source such as a motor. The first locking member 28 and the second locking member 27 can be projected and buried with respect to the mounting surface of the mounting plate 13 in conjunction with the driving of the switching motor. Included in the invention.

  DESCRIPTION OF SYMBOLS 1 Paper feeder, 2 Paper feed roller, 7 Pressure plate, 11 Lever, 13 Placement plate, 29 Subsurface member, 29a Low friction part, 29b High friction part, 30 Substrate stand, 51 Support plate, S sheet, S0 Sheet bundle

Claims (5)

An accommodating portion for accommodating a plurality of sheets in a stacked bundle;
A paper feed roller that presses the tip of one side in the stacking direction of the sheet bundle accommodated in the accommodating portion and feeds only the first sheet by rotating;
Pressurizing means for pressurizing the sheet bundle so as to be in pressure contact with the paper feed roller;
A sheet member disposed opposite to the sheet feeding roller and sandwiching a sheet fed by the sheet feeding roller with the sheet feeding roller to prevent the second and subsequent sheets from being fed; ,
A bakaki moving means for moving the bakaki member so that the bakaki member is pressed against and separated from the paper feed roller;
In a paper feeder having
The surface member is a surface facing the paper feed roller, and the surface surface is provided adjacent to the high friction portion and downstream of the high friction portion in the sheet feeding direction, and has a lower coefficient of friction than the high friction portion. A low friction part, provided to be inclined with respect to the moving direction by the Sabaki moving means,
When the surface is in pressure contact with the paper feed roller, the high friction part is included in the pressure contact range,
When the surface is separated from the paper feed roller by a predetermined distance or more, a perpendicular line dropped from the center of the support shaft of the paper feed roller to the surface is intersected with the low friction part.
The paper feeding device, wherein the high friction part and the low friction part are arranged. A support plate that has an inclined surface that is inclined parallel to the surface, and that supports the surface member on the surface side of the inclined surface;
A crest having a locking surface parallel to the inclined surface with a gap with respect to the back surface side of the inclined surface,
The support plate is fixed at a downstream end of the inclined surface in the sheet feeding direction with a predetermined gap with respect to the saw bed, while the downstream side of the inclined surface in the sheet feeding direction is configured as a free end. 2. The paper feeding device according to claim 1, wherein the paper feeding device is deformed as a result of pressure contact between the paper feeding roller and the buckling member, and at least a part of the paper feeding device abuts against the locking surface during the deformation.   When the moving surface is moved in the direction in which the surface is brought closer to the paper feed roller, the position where the surface and the paper feed roller first contact each other substantially coincides with the boundary between the high friction portion and the low friction portion. The paper feeding device according to claim 1 or 2.   3. The position where the surface and the paper feed roller first come into contact with each other when the moving means is moved in a direction to bring the paper surface closer to the paper feed roller is the high friction portion. The paper feeder described.   2. A step is formed between the low friction portion and the high friction portion so that the high friction portion is closer to the paper feed roller in the high friction portion than in the low friction portion. 4. The paper feeding device according to any one of 4 above.

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