JP2005179043A - Paper feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper feeding device using a suction feed system for reliably separating and feeding paper one by one, having reduced cost and saved space. <P>SOLUTION: A placement stand 12 is provided inside a storage box 11 of the paper feeding device 1, and the paper P is placed thereon. On the uppermost part of a downstream portion in a paper feeding direction of the storage box 11, a stopper 14 is provided for preventing the movement of the paper P to the downstream side. On the upper side of the storage box 11, a suction feed mechanism 20 is arranged for sucking and feeding the paper. On the upper side of an upstream portion of the uppermost layer of the paper P, a forward feed roller 30 is provided for feeding the paper P to the downstream side. When the forward feed roller 30 is rotated, upward deflection of the paper P of the uppermost layer is caused by the stopper 14 preventing the movement of the paper, thus actualizing the suction of the paper P to the suction feed mechanism 20. Then, the paper P is also sucked at its downstream end to the suction feed mechanism 20 by drawing the paper P a preset distance back to the upstream side once. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a paper supply device such as cut paper.

  The paper supply device is used for feeding paper such as cut paper in an image forming apparatus typified by a copying machine or a printer. In many paper supply devices in image forming apparatuses, paper sheets (cut paper) stacked on a mounting table or tray are separated and supplied one by one from the uppermost layer. Such a paper supply device is used for a cassette type paper feeding unit, a manual paper feeding unit, a document feeding unit, and the like of an image forming apparatus.

  There are a suction paper feeding method and a roller paper feeding method as a method of feeding paper from the paper container of the paper supply device to the outside. The suction paper feeding method is composed of two rollers provided on the upstream side and the downstream side in the paper supply direction and a belt wound around these rollers. What is sent out to the outside of the accommodating part is common. On the other hand, the roller paper feeding method is composed of two sets of rollers provided on the upstream side and the downstream side, and the paper is delivered to the downstream roller by the upstream roller, and is moved to the outside of the paper container by the downstream roller. It will be sent out.

In the suction paper feeding method, a levitation unit using airflow is used to separate the sheets stacked in the sheet storage unit one by one. In this method, air is blown from the substantially horizontal direction to the upper downstream end of the sheet bundle to float and separate the upper sheet. Examples of a paper supply device using such a suction paper feeding method can be seen in Patent Documents 1 and 2.
JP 2000-255805 A (page 4-5, FIG. 1) Japanese Patent Laying-Open No. 2003-95467 (page 3-5, FIG. 2)

  In both of the paper supply apparatuses described in Patent Documents 1 and 2, as described above, air is blown to the downstream end of the paper bundle, and the upper paper is floated and separated by the air flow. However, with such a technique, there are many variations in the separation of the sheets, and problems such as double feeding in which the sheets are overlapped and no feeding state in which the sheets cannot be fed at all are likely to occur. In addition, a fan or duct for blowing air to the downstream end of the sheet bundle is necessary, and there is a concern about a significant cost increase, and an increase in the size of the sheet supply device will be caused as the installation space is secured. .

  The present invention has been made in view of the above points, and in a paper supply apparatus using a suction paper feeding method, cost reduction and space saving can be achieved, and paper can be reliably supplied one by one. An object is to provide a paper supply device.

  In order to solve the above-described problems, the present invention provides a paper storage unit that stacks and stores paper on a mounting table, and a suction paper feed that is disposed above the paper storage unit and sucks and feeds the paper from the paper storage unit. A sheet supply device that separates and supplies sheets one by one from the uppermost layer of the sheets stacked on the mounting table, and abuts the upstream portion of the uppermost sheet in the supply direction, and sends the sheet downstream. A front feed roller; a stopper in the paper storage unit that prevents the paper from moving downstream; and a control unit that controls the suction paper feeding mechanism and the front feed roller. When the feed roller is rotated, the uppermost sheet is bent upward, and the sheet is attracted to the suction sheet feeding mechanism.

  In addition, the apparatus includes a sheet storage unit that stacks and stores sheets on the mounting table, and a suction paper feeding mechanism that is disposed above the sheet storage unit and sucks and feeds the sheets from the sheet storage unit. In the paper supply device that separates and supplies paper one by one from the uppermost layer of the printed paper, the suction paper supply mechanism can be rotated in a vertical plane around the downstream portion in the paper supply direction, and the paper storage portion A stopper for preventing the sheet from moving downstream, and a control unit for controlling the suction paper feeding mechanism. The control unit lowers the upstream part of the suction paper feeding mechanism to the uppermost sheet. When the sheet is brought into contact and the sheet is fed downstream by the suction sheet feeding mechanism, the sheet is bent upward, and the sheet is attracted to the suction sheet feeding mechanism.

  In addition, after the suction of the sheet to the suction feeding mechanism is realized, the suction feeding mechanism is returned to the original posture.

  In addition, after the sheet suction to the suction paper feeding mechanism is realized, the paper is once pulled back to the upstream side in the supply direction by a predetermined amount, and after the downstream end of the paper is separated from the stopper and sucked by the suction paper feeding mechanism, The paper was sent out to the downstream side.

  The stopper can take two postures, a posture for preventing paper movement and a retreat posture that does not hinder paper movement. After the suction of the paper to the suction paper feeding mechanism is realized, the posture is changed to the retreat posture. It was decided to.

  The suction paper feeding mechanism includes two rollers on the upstream side and the downstream side in the paper supply direction, and a belt wound around the two rollers, and feeds the paper by rotation of the belt. It was decided.

  According to the configuration of the present invention, the front feed roller that feeds the paper to the downstream side, the stopper that prevents the paper from moving to the downstream side, and the control unit that controls the suction paper feed mechanism and the forward feed roller are provided. When this control unit rotates the forward feed roller, the uppermost sheet is deflected upward, and the suction of the sheet to the suction feeding mechanism is realized. Can be reliably separated using a forward feed roller and sent out by a suction paper feed mechanism. Since only one front feed roller is added and the drive source of the front feed roller can be used in combination with the drive source of another roller, the cost can be reduced compared with the method of floating and separating the paper. In addition, space can be saved.

  In addition, the suction paper feed mechanism can be rotated in a vertical plane around the downstream portion in the paper supply direction, and the paper storage portion is provided with a stopper for preventing the paper from moving downstream, and the suction paper feed mechanism A control unit is provided for controlling the upper side of the suction sheet feeding mechanism to lower the upstream part of the suction sheet feeding mechanism to contact the uppermost sheet, and the sheet feeding mechanism feeds the sheet downstream. At this time, since the paper is bent upward and the suction of the paper to the suction paper feeding mechanism is realized, one sheet of the uppermost layer of the paper is sucked and supplied without preparing a paper separating means separately. It is possible to reliably separate and send out using a paper mechanism. Since no paper separating means is required, significant cost reduction and space saving can be achieved.

  Also, since the upstream portion of the suction paper feeding mechanism is lowered and the suction of the paper to the suction paper feeding mechanism is realized, the suction paper feeding mechanism is returned to the original posture. Can do. Thereby, it is possible to enhance the action of separating the sheets one by one.

  In addition, after the suction of the paper to the suction paper feeding mechanism is realized, the paper is once pulled back to the upstream side by a predetermined amount, and after the downstream end of the paper is separated from the stopper and sucked by the suction paper feeding mechanism, the paper is taken to the downstream side. Therefore, the overlapping sheets can be easily separated by switching the rotation direction to the upstream side and the downstream side by the suction sheet feeding mechanism. Therefore, it is possible to further enhance the action of separating the sheets one by one.

  The stopper can take two postures: a posture that prevents paper movement and a retreat posture that does not impede paper movement. After the suction of the paper to the suction paper feeding mechanism is realized, the posture can be changed to the retreat posture. Therefore, the deflection of the sheet caused by the movement being prevented is eliminated, and the downstream end of the sheet moves upward and is attracted to the suction sheet feeding mechanism. Thereby, it is possible to further enhance the action of separating the sheets one by one.

  In addition, the suction paper feeding mechanism includes two rollers on the upstream side and the downstream side, and a belt wound around the two rollers, and feeds the paper by rotation of the belt. The sheet can be conveyed while being in close contact with the belt. As a result, the sheet conveyance performance is improved.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  First, the outline of the configuration of the paper supply apparatus according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic vertical sectional front view showing a paper feeding device, and FIG. 2 is a schematic top view showing a suction paper feeding mechanism of the paper feeding device.

  The paper supply device 1 includes a paper storage unit 10, a suction paper feeding mechanism 20, a forward feed roller 30, and a control unit 40. The main part of the paper storage unit 10 is configured by a storage box 11. The storage box 11 has an open top surface and is provided with a notch (not shown) on the side surface so that the sheets P can be easily stacked. The sheets P are stacked and stored from the upper surface direction of the storage box 11.

  A placement table 12 is provided inside the storage box 11, and sheets P are stacked on the placement table 12. The sheet P is sent out from the upper part of the mounting table 12 in FIG. The height of the mounting table 12 is changed by the elevating mechanism 13. When the paper P is fully loaded, the mounting table 12 is at the lowermost position and rises as the paper P decreases. As the elevating mechanism 13, a mechanism that pushes up from below like a jack may be adopted, or a mechanism that lifts up with a wire like an elevator may be adopted. A motor (not shown) is used as a power source for the elevating mechanism 13.

  A stopper 14 is provided at the downstream side of the storage box 11 in the paper supply direction, that is, at the uppermost edge on the right side in FIG. The stopper 14 is integrally formed with the storage box 11 and is provided at the center in the paper width direction with the same length as the storage box 11 or shorter than the storage box 11 in the paper width direction perpendicular to the paper supply direction. . Further, as shown in FIG. 1, the stopper 14 protrudes a predetermined amount above the surface of the uppermost layer of the paper P at the paper feeding position. This prevents the paper P from moving downstream.

  The suction paper feeding mechanism 20 is provided above the paper storage unit 10, and sucks and separates the paper P one by one from the uppermost layer of the paper P stacked on the mounting table 12, and feeds the paper P outside the paper supply device 1. It will be sent out. The suction paper feeding mechanism 20 includes a supply belt 21, a driving roller 22, a driven roller 23, and a suction unit 50.

  As shown in FIG. 1, the supply belt 21 is wound around a driving roller 22 and a driven roller 23. The driving roller 22 is provided on the downstream side in parallel with the paper width direction, and the driven roller 23 is also provided on the upstream side. The driving roller 22 is rotated by a motor (not shown). As a result, the supply belt 21 is rotated, and the paper P can be fed. The supply belt 21 can be rotated in both the direction of feeding the paper P to the downstream side and the direction of feeding the paper P to the upstream side. Further, as shown in FIG. 2, the supply belt 21 is provided with a small hole 21 a on one surface.

  As shown in FIGS. 1 and 2, a suction unit 50 is disposed inside the supply belt 21. The suction unit 50 includes a suction duct 51 and a suction fan 52. In FIG. 1, the suction duct 51 is provided close to the supply belt 21 below the drive roller 22 and the driven roller 23 inside the supply belt 21. An intake port 51 a is provided on the entire bottom surface of the suction duct 51. A suction fan 52 is connected to the exhaust side of the suction duct 51. The air sucked by the suction fan 52 is discharged to the outside of the suction unit 50 through the exhaust port 52a.

  A forward feed roller 30 is provided above the upstream portion of the uppermost layer of the paper P loaded in the paper storage unit 10. The forward feed roller 30 contacts the uppermost layer of the paper P and feeds the paper P downstream. The forward feed roller 30 is rotated by a motor (not shown).

  The paper supply device 1 includes a control unit 40. The control unit 40 controls the suction paper feeding mechanism 20 and the forward feed roller 30 to perform the paper P supply operation.

  Next, the paper P supply operation in the first embodiment will be described with reference to FIGS. 3 to 6 in addition to FIG. FIG. 3 is a schematic vertical sectional partial front view showing the upper part of the paper supply device, showing a state in the middle of suction of the paper, FIG. 4 is a view showing the state in which the paper is also attracted to the suction paper feeding mechanism, 5 shows a state in which the sheet is pulled back to the upstream side by the suction feeding mechanism, and FIG. 6 also shows a state in which the sheet is sent out to the outside of the sheet supply device.

  In FIG. 1, before the paper P supply operation is started, the suction and feed operations of the paper P by the suction paper feeding mechanism 20 are stopped. Further, although the forward feed roller 30 is in contact with the uppermost layer of the paper P, it does not rotate.

  When the supply of the paper P is started by the paper supply device 1, the control unit 40 first rotates the forward feed roller 30 (arrow A in FIG. 3) as shown in FIG. give. However, since the sheet P is prevented from moving to the downstream side by the stopper 14 provided at the uppermost edge of the downstream portion of the storage box 11, the sheet P bends. Subsequently, the control unit 40 starts suction of the paper P by the suction paper feeding mechanism 20 (arrow B in FIG. 3). As a result, the bent portion of the sheet P is drawn toward the suction sheet feeding mechanism 20 located above the sheet P.

  Subsequently, when the paper P is sucked by the suction paper feeding mechanism 20, the bent portion of the paper P is attracted to the surface of the supply belt 21 of the suction paper feeding mechanism 20 as shown in FIG. 4. At this stage, the downstream end of the paper P is still caught by the stopper 14. Further, when the front feed roller 30 is rotated by a predetermined amount to the extent that the uppermost layer of the paper P does not come out of contact with the front feed roller 30, the rotation is stopped.

  After the sheet suction to the suction paper feeding mechanism 20 is realized, the control unit 40 rotates the supply belt 21 of the suction paper feeding mechanism 20 in a direction to pull back the paper P upstream as shown in FIG. 5 arrow C). Since the paper P continues to be sucked by the suction paper feeding mechanism 20, when the paper P is pulled back by a predetermined amount, the downstream end of the paper P is separated from the stopper 14 and sucked by the suction duct 51 of the supply belt 21. Adsorbed to the range where the force is reached. Then, as shown in FIG. 6, the supply belt 21 is rotated in a direction to send the paper P to the downstream side (arrow D in FIG. 6), and the paper P passes over the stopper 14 and goes to the outside of the paper supply device 1. Sent out. Thereafter, in order to prepare for the supply of the next sheet P, the mounting table 12 is raised until the uppermost layer of the sheet P reaches a predetermined sheet feeding position.

  In this way, the controller that controls the forward feed roller 30 that feeds the paper P downstream, the stopper 14 that prevents the paper P from moving downstream, and the suction paper feeding mechanism 20 and the forward feed roller 30. 40, and when the control unit 40 rotates the forward feed roller 30, the uppermost sheet P is bent upward, and the sheet P is attracted to the suction sheet feeding mechanism 20. One of the uppermost P layers can be reliably separated by using the forward feed roller 30 and sent out by the suction paper feeding mechanism 20. Since only one front feed roller 30 is added, and the drive source of the front feed roller 30 can be used in combination with the drive source of another roller, the cost can be reduced as compared with the method of separating and separating the paper P. In addition, it is possible to save space.

  In addition, after the suction of the paper to the suction paper feeding mechanism 20 is realized, the paper P is once pulled back to the upstream side by a predetermined amount, and the downstream end of the paper P is separated from the stopper 14 and sucked by the suction paper feeding mechanism 20. Since the paper P is sent to the downstream side, the overlapping paper P can be easily separated by switching the rotation direction to the upstream side and the downstream side by the suction paper feeding mechanism 20. Therefore, it is possible to further enhance the action of separating the sheets P one by one.

  The suction paper feeding mechanism 20 includes two rollers, a driving roller 22 on the downstream side and a driven roller 23 on the upstream side, and a supply belt 21 wound around the two rollers. Since the sheet P is fed by the rotation of the supply belt 21, the sheet P can be conveyed while being in close contact with the supply belt 21. As a result, the conveyance performance of the paper P is improved.

  Next, an outline of the configuration of the paper supply apparatus according to the second embodiment of the present invention will be described with reference to FIG. FIG. 7 is a schematic vertical sectional front view showing the paper feeding apparatus. Since the basic configuration of this embodiment is the same as that of the first embodiment shown in FIGS. 1 to 6, the same reference numerals are assigned to the same components as those of the first embodiment. The description will be omitted.

  In FIG. 7, a stopper 14 is provided at the uppermost edge of the downstream portion of the storage box 11 in the paper supply direction. The stopper 14 has a lower end supported by the storage box 11 and can rotate about the fulcrum and the upper end as a free end (arrow E in FIG. 7). When the stopper 14 is in a vertical attitude, the uppermost layer of the paper P is prevented from moving downstream, and when the upper end of the stopper 14 is tilted downstream, the movement of the paper P is not hindered. As described above, the stopper 14 can take two postures: a posture for preventing paper movement and a retracting posture for preventing paper movement. The posture of the stopper 14 is changed by a solenoid (not shown).

  The suction paper feeding mechanism 20 includes a supply belt 21, a driving roller 22, a driven roller 23, and a suction unit 50. The suction paper feeding mechanism 20 can rotate around the axis of the driving roller 22 in a vertical plane perpendicular to the paper width direction as indicated by an arrow F. As a result, the upstream portion of the supply belt 21 can be lowered and brought into contact with the uppermost layer of the sheets P stacked on the sheet supply section 10. Such a posture change of the suction paper feeding mechanism 20 itself is performed by a motor (not shown).

  The control unit 40 controls the posture change of the stopper 14, the suction and delivery of the paper P by the suction paper feed mechanism 20, and the posture change of the suction paper feed mechanism 20 itself.

  Next, the paper P supply operation in the second embodiment will be described with reference to FIGS. 8 to 12 in addition to FIG. FIG. 8 is a schematic vertical sectional partial front view showing the upper part of the paper supply device, and shows a state in which the upstream portion of the suction paper feeding mechanism is lowered. FIG. FIG. 10 shows the state where the stopper is changed to the retracted posture, and FIG. 11 also shows the state where the suction paper feeding mechanism is returned to the original posture. FIG. 12 shows a state where the sheet is sent out to the outside of the sheet supply apparatus.

  In FIG. 7, before the feeding operation of the paper P is started, the sucking and feeding operations of the paper P by the suction paper feeding mechanism 20 are stopped. The suction paper feeding mechanism 20 itself is not in contact with the uppermost layer of the paper P and maintains a substantially horizontal posture. In addition, the stopper 14 is in a vertical state and holds a posture for preventing paper movement.

  When the supply of the paper P is started by the paper supply device 1, as shown in FIG. 8, the control unit 40 first lowers the upstream portion of the suction paper feeding mechanism 20 and changes its posture (arrow G in FIG. 8). As a result, the upstream portion of the supply belt 21 of the suction paper feeding mechanism 20 is brought into contact with the uppermost layer of the paper P stacked on the paper supply portion 10.

  Then, as shown in FIG. 9, the supply belt 21 is rotated (arrow H in FIG. 9) to feed the paper P downstream. However, since the sheet P is prevented from moving to the downstream side by the stopper 14 provided at the uppermost edge of the downstream portion of the storage box 11, the sheet P bends. Subsequently, the control unit 40 starts suction by the suction paper feeding mechanism 20 (arrow J in FIG. 9). As a result, the bent portion of the sheet P is drawn toward the suction sheet feeding mechanism 20 located above the sheet P.

  After the suction of the paper to the suction paper feeding mechanism 20 is realized, the control unit 40 stops the rotation of the supply belt 21 and changes the posture of the stopper 14 to the retracted posture that does not prevent the paper movement as shown in FIG. (Arrow K in FIG. 10). Since the paper P continues to be sucked by the suction paper feeding mechanism 20, the downstream end of the paper P is separated from the stopper 14 by changing the posture of the stopper 14 to the retracted posture, and the suction force of the suction duct 51 of the supply belt 21. It is adsorbed over a range of

  Then, as shown in FIG. 11, the control unit 40 rotates the suction paper feeding mechanism 20 itself to return to the original posture (arrow L in FIG. 11). At this time, in order to prepare for the supply of the next paper P, the posture of the stopper 14 is changed to a posture that prevents paper movement (arrow M in FIG. 11). When the suction paper feeding mechanism 20 returns to the original posture, as shown in FIG. 12, the supply belt 21 is rotated in a direction to feed the paper P to the downstream side, and the paper P passes over the stopper 14 and passes through the paper supply device. 1 is sent out (arrow N in FIG. 12). Thereafter, in order to prepare for the supply of the next sheet P, the mounting table 12 is raised until the uppermost layer of the sheet P reaches a predetermined sheet feeding position.

  In this way, the suction paper feeding mechanism 20 can be rotated in a vertical plane centering on the downstream portion in the paper supply direction, and the paper storage portion 10 is provided with a stopper 14 that prevents the paper P from moving downstream. And a control unit 40 for controlling the suction paper feeding mechanism 20. The control unit 40 lowers the upstream part of the suction paper feeding mechanism 20 to contact the uppermost sheet P, and this suction paper feeding. When the sheet P is fed downstream by the mechanism 20, the sheet P is bent upward, and the sheet P is attracted to the suction sheet feeding mechanism 20. Therefore, a separating unit for the sheet P is separately prepared. Therefore, it is possible to reliably separate and send out the uppermost sheet P of the paper P by using the suction paper feeding mechanism 20. Since the separating means for the paper P is not necessary, it is possible to achieve significant cost reduction and space saving.

  Further, the suction paper feeding mechanism 20 is lowered and the suction paper feeding mechanism 20 is returned to the original posture after the suction of the paper to the suction paper feeding mechanism 20 is realized. Therefore, the sucked paper P is pulled upward. be able to. Thereby, it is possible to enhance the action of separating the sheets P one by one.

  The stopper 14 can take two postures, a posture for preventing paper movement and a retreat posture that does not hinder paper movement. After the suction of the paper to the suction paper feeding mechanism 20 is realized, the posture is changed to the retreat posture. Therefore, the deflection of the paper P caused by the movement being prevented is eliminated, and the downstream end of the paper P moves upward and is attracted to the suction paper feeding mechanism 20. Thereby, it is possible to further enhance the action of separating the sheets P one by one.

  In the present embodiment, in the first embodiment, the paper P is sent to the downstream side by the forward feed roller 30, and the paper is separated by switching the rotation direction of the supply belt 21 to the upstream side and the downstream side. In the second embodiment, the combination of the feeding of the paper P downstream by the change of the posture of the suction paper feeding mechanism 20 and the separation of the paper by the change of the posture of the stopper 14 was introduced. However, the combination is not limited to the above, and a combination of feeding the paper P downstream by the forward feed roller 30 and paper separation by changing the attitude of the stopper 14, and changing the attitude of the suction paper feeding mechanism 20. The feeding of the paper P to the downstream side by the above and the paper separation by switching the rotation direction to the upstream side and the downstream side of the supply belt 21 may be combined.

  Although the embodiment of the present invention has been described above, various modifications can be made without departing from the spirit of the present invention.

  The present invention can be used in general paper supply apparatuses using a suction paper feeding method.

FIG. 3 is a schematic vertical cross-sectional front view showing the paper supply apparatus according to the first embodiment of the present invention. FIG. 2 is a schematic top view of a suction paper feeding mechanism of the paper supply device shown in FIG. 1. Fig. 4 is a schematic vertical sectional partial front view showing the upper part of the paper feeding apparatus shown in Fig. 1, and shows a state during the suction of the paper. FIG. 2 is a schematic vertical sectional partial front view showing the upper part of the paper supply apparatus shown in FIG. 1 and shows a state in which the paper is adsorbed to the suction paper supply mechanism. Fig. 1 is a schematic vertical sectional partial front view showing the upper part of the paper supply device shown in Fig. 1, and shows a state where the paper is pulled back to the upstream side by the suction paper supply mechanism. Fig. 2 is a schematic vertical sectional partial front view showing the upper part of the paper supply device shown in Fig. 1, and shows a state in which the paper is fed out of the paper supply device. These are the model vertical cross section front views which show the paper supply apparatus which concerns on the 2nd Embodiment of this invention. Fig. 7 is a model vertical sectional partial front view showing the upper part of the paper feeding device shown in Fig. 7 and shows a state where the upstream portion of the suction paper feeding mechanism is lowered. Fig. 7 is a schematic vertical sectional partial front view showing the upper part of the paper supply device shown in Fig. 7 and shows a state where the paper is fed downstream and the paper is adsorbed. Fig. 7 is a schematic vertical sectional partial front view showing the upper part of the paper supply device shown in Fig. 7 and shows a state where the stopper has been converted into a retracted posture. FIG. 7 is a model vertical sectional partial front view showing the upper part of the paper supply apparatus shown in FIG. 7 and shows a state in which the suction paper feeding mechanism is returned to the original posture. Fig. 7 is a schematic vertical sectional partial front view showing the upper part of the paper supply device shown in Fig. 7 and shows a state in which the paper is fed out of the paper supply device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper supply apparatus 10 Paper storage part 11 Storage box 12 Mounting stand 14 Stopper 20 Suction feeding mechanism 21 Supply belt 30 Forward feed roller 40 Control part 50 Suction part

Claims (6)

A paper storage unit for storing paper on the mounting table and a suction paper feeding mechanism that is disposed above the paper storage unit and sucks and feeds the paper from the paper storage unit, and is stacked on the mounting table. In a paper supply device that separates and supplies paper one by one from the top layer of paper,
A forward feed roller that contacts the upstream portion of the uppermost layer of the paper in the supply direction and feeds the paper downstream; a stopper in the paper storage portion that prevents the paper from moving downstream; and the suction paper feed And a control unit for controlling the mechanism and the forward feed roller. When the control unit rotates the forward feed roller, the uppermost sheet is bent upward, and the suction sheet feeding mechanism is A paper supply device that is realized. A paper storage unit for storing paper on the mounting table and a suction paper feeding mechanism that is disposed above the paper storage unit and sucks and feeds the paper from the paper storage unit, and is stacked on the mounting table. In a paper supply device that separates and supplies paper one by one from the top layer of paper,
The suction paper feed mechanism is rotatable in a vertical plane centering on a downstream portion in the paper supply direction, and the paper storage portion is provided with a stopper for preventing the paper from moving downstream, and the suction paper feed mechanism A control unit for controlling the mechanism is provided, and the control unit lowers the upstream part of the suction paper feeding mechanism to contact the uppermost sheet, and feeds the paper downstream by the suction paper feeding mechanism. When the sheet is fed, the sheet is deflected upward, and the sheet is attracted to the suction sheet feeding mechanism.   The paper supply device according to claim 2, wherein the suction paper feeding mechanism is returned to the original posture after the suction of the paper to the suction paper feeding mechanism is realized.   After the suction of the paper to the suction paper feeding mechanism is realized, the paper is once pulled back to the upstream in the supply direction by a predetermined amount, and after the downstream end of the paper is separated from the stopper and sucked by the suction paper feeding mechanism, the paper is removed. The paper supply device according to any one of claims 1 to 3, wherein the paper supply device is sent out to a downstream side.   The stopper can take two postures, a posture for preventing paper movement and a retreat posture that does not hinder paper movement, and after the suction of the paper to the suction paper feeding mechanism is realized, the posture is changed to the retreat posture. The paper supply device according to claim 1, wherein the paper supply device is a paper supply device.   The suction paper feeding mechanism includes two rollers on the upstream side and the downstream side in the paper supply direction, and a belt wound around the two rollers, and feeds the paper by rotation of the belt. The paper supply device according to claim 1, wherein the paper supply device is a paper supply device.

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