JP4694426B2 - Paper sheet separator - Google Patents

Description

  The present invention relates to a paper sheet separating apparatus.

  The problem with the conventional paper sheet separating mechanism that separates and feeds paper sheets of different sizes and rigidity one by one is the prevention of double feeding due to deviation in the transport direction and the separation of the paper sheets to be separated. This is correction of skew (hereinafter referred to as skew).

  As an example of the prior art relating to the prevention of double feeding caused by a shift in the transport direction, there is a paper sheet feeding device described in, for example, Japanese Patent Application Laid-Open No. 2002-347961 (hereinafter referred to as Patent Document 1).

  In the paper sheet feeding device described in Patent Document 1, when feeding a long and short mixed banknote, if the leading edge of the banknote is not aligned with respect to the gate part in the paper sheet feeding part, The purpose is to prevent the second bill from being fed out (hereinafter referred to as double feeding) as a result of the second bill being fed out and entering the gate portion without being fed out.

  In Patent Document 1, in order to prevent double feeding, preliminary feeding means for feeding the uppermost one of the sheets stacked on the stage to the gate roller until it hits a low friction surface other than the high friction portion of the feed roller; A kicker roller (hereinafter referred to as a pickup roller) that is provided between the feed roller and the preliminary feeding means and has a high friction portion in a part of the periphery and is driven intermittently in synchronization with the feed roller. ing.

  In this way, by providing the preliminary feeding means in the counter feeding direction from the pickup roller, even if there is a paper sheet having a short feeding direction length in the stacked paper sheet, the paper sheet and the gate unit When the interval is large, the short sheet is devised so as to be sent to a predetermined feedable position by the preliminary sending means to prevent double feeding.

  As an example of the prior art relating to skew correction of paper sheets, there is a skew correction apparatus for paper sheets described in, for example, Japanese Patent Application Laid-Open No. 2005-255406 (hereinafter referred to as Patent Document 2). This skew correction device for paper sheets corrects skew while conveying the skewed paper sheets based on the sensor information of the skew amount of the paper sheets.

  In Patent Document 2, a drive roller disposed on the left and right sides of the conveyance path to correct skew and a driven roller having a narrow contact surface disposed opposite to these drive rollers are provided. The taper roller has a tapered surface, and the rotation axis is inclined so that the contact portion of the taper roller is substantially parallel to the conveyance path. Accordingly, the sheet is moved in the left-right direction and the contact position with the taper roller is changed to accelerate or decelerate the conveyance speed of one side portion of the sheet, thereby correcting the skew of the sheet.

  In addition, regarding the skew correction mechanism of the paper sheet, as shown in FIG. 18 attached to the present specification, the paper sheet 300 is transported by a transport unit such as a roller 301 and is collided with a stopper 302 so as to skew. A method of correcting the problem is also conceivable. However, in this method, it is necessary to reduce the conveying force of the conveying means in order to prevent buckling of the paper sheets and to cause slippage between the paper sheets and the conveying means when correcting skew feeding. It is. However, there is a problem that paper sheets cannot be normally conveyed if the conveying force is reduced. In particular, in an apparatus that handles a wide variety of types and states of paper sheets to be handled, it is extremely difficult to find a condition for achieving both correction of sheet skew and prevention of buckling.

JP 2002-347961 A JP-A-2005-255406

  In the above-mentioned Patent Document 1, although the multi-feed and skew feeding of the separated paper sheets are prevented, the skew correction is not considered. For this reason, the paper feeding out by the separation mechanism as in Patent Document 1 is corrected using the skew correction mechanism as shown in Patent Document 2 to solve the problems of double feeding and skew. It is possible. However, providing the skew correction mechanism separately from the paper sheet separating mechanism causes a problem that it is difficult to reduce the size of the paper sheet processing mechanism.

  Further, as in the skew correction mechanism disclosed in Patent Document 2, when skew correction is performed while paper sheets are being conveyed, the paper in the width direction of the paper sheets (direction perpendicular to the conveyance direction) Leaf movement occurs. For this reason, there also exists a problem that the fault by the side edge part of paper sheets contacting with the component of a processing apparatus tends to generate | occur | produce.

  Further, in the method of correcting the skew by colliding the paper sheet with the stopper, the buckling of the paper sheet is prevented and the slip occurs between the paper sheet and the conveying means when correcting the skew. Therefore, it is necessary to reduce the conveying force of the conveying means. However, there is a problem that paper sheets cannot be normally conveyed if the conveying force is reduced. In particular, in an apparatus that handles a wide variety of types and states of paper sheets to be handled, it is extremely difficult to find a condition for achieving both correction of sheet skew and prevention of buckling.

  The purpose of the present invention is to correct the skew of paper sheets and to prevent buckling, and to separate sheets of different sizes one by one without causing skew or double feed An object of the present invention is to provide a paper sheet separating apparatus that can be fed out.

The purpose is to apply a conveying force to the paper sheet in a predetermined conveying direction, and to provide a conveying resistance force to the paper sheet on the downstream side of the conveying means and at least two conveying means arranged coaxially. In the paper sheet separating apparatus having a brake pad that performs the above, the brake pad is provided between the conveying means, the brake pad imparts resistance to the skewed paper sheet, and the conveying means by applying a conveying force to the end a intended to modify skew, the second transport means disposed downstream of the conveyance means, it is provided the brake pad to said conveyance means, said second the conveying means has a clearance portion in which the conveyance means are not sandwiching the paper sheet being transported, the transportable said When feeding means has finished conveying the second conveying means is achieved by starting the conveyance .

  Further, the above object is achieved by forming the gap formed in the second conveying means by a high friction member provided at a part of the outer periphery.

  According to the present invention, a skew correction mechanism that achieves both correction of sheet skew and buckling prevention, and sheets of different sizes are separated one by one without causing skew and double feed. Thus, a paper sheet separating apparatus that can be fed out can be provided.

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

FIG. 1 is a diagram showing a configuration of a paper sheet skew correction mechanism provided with an embodiment of the present invention.
FIG. 2 is a partially enlarged view of a paper sheet skew feeding correction mechanism provided with an embodiment of the present invention.
1 and 2, in the paper sheet skew correction mechanism, two transport rollers 101L (R) are provided on the left and right sides of the transport path to transport the paper sheet 100. Reference numeral 102 denotes a drive shaft that transmits a driving force to the transport rollers 101L (R). Reference numeral 103L (R) denotes two driven rollers that rotate in contact with the conveying roller 101. A driven shaft 104 holds the driven roller 103L (R). Reference numeral 105 denotes another driven roller which is attached to the driven shaft 104 at the center of the conveyance path and is rotatable. Reference numeral 106 denotes a brake pad attached to the driven roller 105 so as to be in contact with and opposed to the driven roller 105. Reference numeral 107 denotes a spring member for generating a force for pressing a conveyance guide, which will be described later, against the driven roller 105. Reference numeral 108 denotes a conveyance guide for guiding the conveyance of paper sheets. As described above, the skew correction mechanism according to this embodiment includes the above-described components 100 to 108 and driving means (not shown) for driving the driving roller.

  The outer periphery of the transport roller 101L (R) is made of a rubber material, and the paper sheet is transported by transport by friction acting between the rubber and the paper sheet 100. Further, the contact surface of the brake pad 106 with the driven roller 105 is constituted by a member having a slightly higher friction coefficient. Note that the conveyance resistance R acting on the paper sheet 100 conveyed between the brake pad 106 and the driven roller 105 is based on the conveyance force that can be generated between the conveyance roller 101L (R) and the driven roller 103L (R). It is small and is set to such an extent that a conveyance failure such as buckling due to the conveyance resistance R does not occur.

  Next, the operation of the skew correction mechanism will be described with reference to FIGS.

FIGS. 3A, 3B, and 4 are views showing a state in which the skewed paper sheets are conveyed to the skew correction mechanism of the present embodiment.
3A, 3B, and 4, when the paper sheet 100A is nipped and conveyed by the left and right conveying rollers 101L (R) and the driven roller 103L of FIG. It is conveyed as it is skewed. However, as shown in FIG. 3B, when the paper sheet 100A passes through the nipping portion of one of the conveying rollers 101L and the driven roller 103L (shown in FIG. 1), the other conveying roller 101R and the driven roller 103R ( A rotation moment M due to a couple is generated in the paper sheet 100A by the conveyance force FR generated in the clamping portion (shown in FIG. 1) and the conveyance resistance force R between the brake pad 106 and the driven roller 105 in the center. The rotation moment M causes the paper sheet to rotate as shown in FIG. 3B, and the skew of the paper sheet is corrected.

  In other words, as shown in FIG. 3A, the skewed paper sheet 100A advances in the direction of the arrow (open arrow), and one end of the paper sheet 100A has the driving roller L and the driven roller 103L (conveying means). Detach from pinching by. Thereafter, while resistance is applied by the brake pad 106 (conveyance resistance means) that holds the central portion of the paper sheet 100A, the conveyance roller 101R continues to be conveyed by rotation, so the paper sheet 100A has a moment about the brake pad 106 as an axis. By rotating in the M direction, the skew is corrected as shown in FIG.

  In the present embodiment, the example in which the place where the conveyance resistance force is applied between the brake pad 106 and the paper sheet 100A is provided in the middle portion of the left and right rollers, but this is the moment M for correcting the skew feeding. As long as this occurs, it may be provided anywhere. The range in which the moment M for performing the skew correction is generated is the range S shown in FIG. That is, as shown in FIG. 4, this range S includes a straight line 121 connecting the rotation axis centers of the left and right transport rollers, straight lines 122 and 123 in the rotation direction of the transport rollers 101L (R) provided on the left and right, The straight line 121 connecting the rotation axis center of the transport roller 101L (R) is surrounded by the straight line 124 parallel to the straight line 121 at the position in the transport direction of the paper sheet for correcting the skew to the downstream side in the transport direction of the paper sheet. It is a range.

  The skew correction described above does not work because the rotational moment does not act when there is a place where the paper sheet 100A is sandwiched by other transport means or the like other than the transport roller 101R and the driven roller 103R. Therefore, when correcting the skew of the paper sheet 100A, the paper sheet 100A needs to be in a rotatable state.

FIG. 5 is a diagram showing an embodiment in which the above-described skew correction mechanism is provided in the conveyance path.
In FIG. 5, this skew correction mechanism is provided with drive rollers 110A (B) which are in contact with each other as conveying rollers downstream of the above-described skew correction mechanism. The driving roller 110A (B) is fixedly attached to a driving shaft 112 that drives the driving roller 110A (B), and is driven by a driving source (not shown).

When the skew correction of the paper sheet 100 is performed, the paper sheet 100 needs to be in a rotatable state. Therefore, the driving roller 110A that conveys the paper sheet 100 on the downstream side of the skew correction mechanism.
110B is partially cut as shown in FIG. When the paper sheet 100 is conveyed to these drive roller 110A (B) portions, a gap is provided between the drive rollers 110A and 110B. When the skew-corrected paper sheet 100 is conveyed to the drive roller 110A (B), the paper sheet detection sensor 111 detects this, and a control unit (not shown) performs an appropriate calculation based on this detection signal. The driving roller 110A (B) rotates in the transport direction to transport the paper sheet 100 further downstream.

  When the paper sheet 100 is conveyed to the drive roller 110A (B), a portion where a gap can be formed between the drive rollers A (B) is formed by, for example, a phase plate 113 fixed to the shaft 112. Based on this signal, a control unit (not shown) controls the alignment of the driving roller based on this signal.

  As described above, according to the present invention, it is possible to correct the skew without generating a compressive force that easily causes buckling in the in-plane direction of the skewed paper sheet. Therefore, in an apparatus that handles a wide variety of types and states of paper sheets to be handled, it is possible to realize a paper sheet skew correction mechanism that does not cause any troubles during skew correction.

  FIG. 6 is a view showing a paper sheet separating apparatus provided with another embodiment.

In FIG. 6, in the paper sheet separating apparatus 2, a pickup roller 202 serving as a feeding unit that applies a feeding force to the uppermost paper sheet 201 </ b> A of the stacked paper sheets 201 when being fed, and a fed paper sheet to a fee Dorora 203 as conveying means for imparting a conveying force, a gate roller 204 which imparts conveyance resistance force to the paper sheet in order to prevent the plurality of sheets are fed out simultaneously, it is unwound one by one A transport roller 205 for transporting the paper sheets further downstream, a stacker 206 for stacking stacked paper sheets, and a function of pressing the paper sheets 201 against the pickup roller 202 during separation. A box 207 for accumulating paper sheets, a pre-feed roller 208 for applying a conveying force to the paper sheets at the rear end portion of the paper sheets 201 accumulated in the box 207, and pre-feed A first brake pad 209 that applies a conveyance resistance force to the central portion of the paper sheet at the same axial position as the conveyance force action point of the roller 208, and the same axial position as an overlap portion composed of a feed roller and a gate roller portion The second brake pad 210 applies a conveyance resistance force to the central portion of the paper sheet.

  The pickup roller 202 and the feed roller 203 have high friction portions 202A and 203A, part of the outer periphery of which is made of a rubber material. The phase of these high friction portions has no problem with the paper sheet during feeding. It is adjusted to synchronize so that it is fed out. The pickup roller 202 is provided with another high friction portion 202B having a phase different from that of the high friction portion 202A. Further, a part of the outer periphery of the preliminary feed roller 208 also has a high friction portion 208A made of a rubber material.

The shape of the rollers such that the peripheral speed of the high friction portion 202A or 202B of the pickup roller 202, the peripheral speed of the outer periphery of the feed roller 203, and the peripheral speed of the high friction portion 208A of the preliminary feed roller 208 are substantially the same. It is a dimension. Note that the pickup roller 202 has a size and shape so as not to come into contact with the accumulated paper sheets 201 except for the high friction portion. The pickup roller 202, the feed roller 203, and the preliminary feed roller 208 are transmitted with driving force from a driving source (not shown) to shafts 202S, 203S, and 208S by a driving mechanism including a gear and a belt (not shown). It is configured to rotate in synchronization.

  In the gate roller 204, a shaft 204S that holds the gate roller 204 is connected to a drive mechanism (not shown) so that the gate roller 204 can rotate only in the direction opposite to the direction in which the paper is fed.

  For example, when the drive source is a stepping motor, the control of each roller is performed by generating a start or stop signal for the stepping motor by a control unit (not shown).

FIG. 7 is a view of the preliminary feed roller 208 viewed from above.
In FIG. 7, as in the skew correction mechanism shown in the first embodiment, the preliminary feed roller 208 is also a skew correction mechanism. That is, two preliminary feed rollers 208 provided on the left and right in the direction of the axis 208S in the box 207 for preliminary feeding of paper sheets, a drive shaft 208S for transmitting a driving force to the preliminary feed roller 208, and left and right A brake pad 209 attached so as to come into contact with the bills 201 stacked almost at the center of the preliminary feeding roller 208, and a spring member 212A that generates a force for pressing the brake pad 209 against the paper sheet 201 (shown in FIG. 6). And a driving means (not shown) for driving the preliminary feeding roller.

  As described above, the preliminary feeding roller 208 has a high friction portion 208A (shown in FIG. 6) made of a rubber material at a part of the outer periphery thereof, and the other outer peripheral portion is connected to the paper sheet 201. It is made of a material having a low friction coefficient. The paper sheet 201 is conveyed by the force of friction acting between the high friction part 208A and the paper sheet 201 only when the paper sheet 201 and the high friction part 208A are in contact with each other, but is conveyed in other parts. Not to be.

  On the other hand, the contact surface of the brake pad 210 that is pressed by the spring member 212B with the paper sheet 201 is formed of a member having a slightly high friction coefficient. Note that the conveyance resistance force R2 acting on the paper sheet 201 conveyed by the brake pad 209 as in the first embodiment is based on the conveyance force that can be generated between the preliminary feed roller 208 and the paper sheet 201. It is small and is set to such an extent that a failure such as buckling due to the conveyance resistance R2 does not occur.

FIG. 8 is a view showing the paper sheet separating mechanism of this embodiment.
In FIG. 8, the gate roller 204 is arranged between the feed rollers 203 in a state of being nested in the feed roller 203. In the paper sheet separating mechanism 2 of this embodiment, four feed rollers 203 are arranged in the axial direction of the shaft 203S. In addition, two gate rollers 204 are arranged so as to overlap the feed roller 203 in the axial direction of the shaft 204S. The gate roller 204 is fixedly attached to the shaft 204S, and does not rotate in the paper sheet conveying direction, but can be rotated in a direction opposite to the paper sheet conveying direction by a driving means (not shown). is there.

  With such a configuration, when the paper sheet 201 passes through the feed roller 203, the waveform is deformed as shown in FIG. The conveying force that the feed roller 203 exerts on the paper sheet during feeding is a frictional force between the feed roller 203 and the paper sheet that is generated by the deformation force caused by the waveform deformation generated on the paper sheet. The amount of overlap depends on the separation characteristics at the time of proper feeding from the rigidity of the paper sheets to be handled, the elasticity in the radial direction of the gate roller 204 (pressure characteristics), the dimension between adjacent feed rollers, the width dimension of the gate roller 204, etc. It is set to be.

  As shown in FIG. 8, the overlap portion of the present embodiment is attached to the intermediate portion of the left and right gate rollers 204 so as to be in contact with the driven roller 211 and the driven roller 211 rotatably attached to the shaft 204 </ b> S. The brake pad 210 is attached, and the skew correction can be performed at this point. A spring means 212 for generating a force for pressing the brake pad 210 against the driven roller 211 is attached to the brake pad 210.

  The contact surface between the brake pad 210 and the driven roller 211 is composed of a member having a slightly higher friction coefficient. In addition, the conveyance resistance force which acts on the paper sheet 201 conveyed between the brake pad 210 and the driven roller 211 is smaller than the conveyance force that can be generated between the feed roller 203, the gate roller 204, and the pickup roller 202, In addition, the spring means 212B is set to such an extent that a conveyance failure such as buckling due to the conveyance resistance force does not occur. The shape of the brake pad 210 is also a shape that fulfills the function of conveyance guidance for the conveyed paper sheet 201.

FIG. 9 is a diagram showing the positions of the pickup roller and the preliminary feed roller in the paper sheet separating mechanism of this embodiment.
In FIG. 9, the distance between the line connecting the axis center of the feed roller 203 and the gate roller 204 and the line connecting the axis center of the pickup roller 202 is x, the line connecting the axis center of the feed roller 203 and the gate roller 204 and the box 207 The distance to the inner wall on the feeding side is y, the distance between the line connecting the axis center of the feed roller 203 and the gate roller 204 and the line connecting the axis center of the auxiliary feed roller 208 is z, and the axis center of the feed roller 203 and the gate roller 204 Is the distance between the line connecting the axes of the transport rollers 205 and the line connecting the axis centers of the transport rollers 205, W is the width dimension in the feeding direction of the paper sheet storage space of the box 207, and is the maximum of the paper sheets handled by this paper sheet separating mechanism. The dimension in the feeding direction of the object is Lmax, and the dimension in the feeding direction of the smallest one is Lmin.

  The position of the preliminary feed roller 208 is determined by z as the distance between the line connecting the axis center of the feed roller 203 and the gate roller 204 and the line connecting the axis center of the preliminary feed roller 208. Is attached at a position that is approximately the same as or larger than the dimension Lmax in the feeding direction of the largest one.

  The attachment position x of the pickup roller 202 from the line connecting the feed roller 203 and the gate roller 204 is disposed at a position where the value of x is equal to or greater than the value of y + W−Lmin. This is a position where the feeding force does not act on the second and subsequent sheets even when the smallest dimension of the sheet is shifted to the maximum in the reverse feeding direction of the box. Further, the installation position x of the pickup roller 202 is equal to or less than the value of Lmin−d. This is the distance at which the pickup roller 202 can transport the minimum size paper sheet to the position where the transport roller 205 pinches it.

10 and 11 are diagrams showing the dimensional relationship between the diameters of the preliminary feed roller, the pickup roller, and the feed roller 203 and the high friction portion in this embodiment.
10 and 11, the peripheral speeds of the high friction portions 202A and 202B of the pickup roller 202, the peripheral speed of the outer periphery of the feed roller 203, and the peripheral speed of the high friction portion 208A of the preliminary feed roller 208 are substantially the same. The shape of the roller is as follows. Note that the pickup roller 202 has a size and shape so as not to come into contact with the accumulated paper sheets 201 except for the high friction portion.

  As shown in FIG. 10, the circumferential length Lc of the high friction portion 208 </ b> A of the preliminary feeding roller 208 is the distance y between the line connecting the shaft centers of the feed roller 203 and the gate roller 204 and the inner wall on the feeding side of the box 207. The length is almost the same as or less than that. This is to prevent the leading end portion of the paper sheet from being buckled by receiving a resistance force from the overlap portion when the maximum size paper sheet is conveyed by the preliminary feeding roller 208.

  As shown in FIG. 11, the length of the high friction portion 203A of the feed roller 203 is Lf, and among the high friction portions of the pickup roller 202, the length of the high friction portion 202A at a position synchronized with the high friction portion 203A of the feed roller 203 is shown. When LpA is the length and LpB is the length of the high friction portion 202B at a position that is not synchronized, Lf and LpA have substantially the same dimensions. The dimensions Lf and LpA are larger than the distance d between the line connecting the axis centers of the feed roller 203 and the gate roller 204 and the axis connecting the axis of the transport roller 205 and exceed the value of Lmin−x. It is set to be no value. The paper sheet whose leading end has entered the overlap part is reliably conveyed to the conveyance roller 205, and the high friction part 202A of the pickup roller 202 is a position where the feeding force does not act on the second and subsequent sheets.

  The length LpB of the other high friction portion 202B of the pickup roller 202 is larger than the value of z−Lmin and smaller than d. This is because the second sheet is reliably conveyed to the overlap portion by the conveyance force of the high friction portion 202B and not conveyed to the conveyance roller 205. Further, the position LpI in the outer peripheral direction of the high friction portion 202B is a position having substantially the same value as the value of Lmax-x from the position where the high friction portion 202A starts. This prevents the high friction portion 202B from coming into contact with the first sheet being fed.

  Note that the high friction portion 208A of the preliminary feed roller is set so that the end of the high friction portion 208A is substantially the same as the start position of the high friction portions 202A and 203A of the pickup roller 202 and the feed roller 203.

  FIG. 12 is a diagram showing a state in which the conveying force is generated in the feeding direction of each roller during the paper sheet separating operation when the high friction portion of each roller is arranged. The horizontal axis is time, and the vertical axis is the conveying force. is there.

  In FIG. 12, the generation state of the conveyance force and conveyance resistance force of each roller in the separation operation is classified into five cases from (1) to (5). That is, the first is when only the preliminary feed roller 208 shown in (1) generates a conveying force, and the second is when both the pickup roller 202 and the feed roller 203 shown in (2) generate a conveying force. Third, when the conveying force is acting only on the conveying roller 205 on the separated and fed paper sheets shown in (3), the fourth is the second sheet that is separated and fed out as shown in (4). When the conveying force of the second high friction part 202B of the pickup roller 202 acts on the paper sheet of No. 5, the fifth is fed from the gate roller to the second paper sheet that has entered the overlap part shown in (5). This is a case where a conveying force in a direction opposite to the direction acts.

  The paper sheet separation mechanism is configured as described above, and the state of force generation of each roller as shown in FIG. 12 allows the paper sheets of various sizes to be skewed. Lines can be corrected and separated one by one without causing double feeding.

FIG. 13 is a diagram for explaining the state of the paper sheet during the separation operation.
In FIG. 13, when performing the separation operation, first, the stacking table 206 is once lowered, and control is performed so that the uppermost sheet 201A does not contact each roller. Thereafter, the pickup roller 202, the feed roller 203, and the preliminary feed roller 208 are rotated and adjusted to the initial position. The initial position is a position where the start position of the high friction portion 208A of the preliminary feed roller 208 is in contact with the paper sheet. In this position control, for example, the position of a phase plate (not shown) attached to the shaft 203S of the feed roller 203 is detected by a sensor (not shown), and the drive source is activated and stopped based on this signal to perform position control.

  Next, the stacking table 206 moves upward and stops when the paper sheet 201 is pressed against the pre-feed roller 208 or a pressure detection unit (not shown) with a predetermined pressure. The pressure is detected by detecting the pressure or a position corresponding to the pressure with a pressure detection sensor (not shown). The loading platform 206 is stopped by stopping a drive source (not shown) based on the detected pressure signal.

Thereafter, the pickup roller 202, the feed roller 203, and the transport roller are rotationally driven in the sheet feeding direction as indicated by arrows. First, in the first state in FIG. 12, the paper sheet that contacts the preliminary feeding roller 208 is conveyed by the conveying force of the preliminary feeding roller 208. At this time, the paper sheets that are not skewed are transported in the feeding direction as shown in FIG. 14, but the paper sheets that are skewed are transported as shown in FIG. 15 (a). When the sheet 201 passes through one of the preliminary feeding roller portions, a rotational moment due to a couple is generated in the paper sheet 201 due to the conveyance resistance generated by the other preliminary feeding roller 208R and the brake pad 209 at the center. At this time, since the pickup roller 202 is not in contact with the paper sheet 201 as described above, the rotation of the paper sheet 201 as shown in FIG. Is done.

  At this time, if the uppermost paper sheet 201A is not in contact with the pre-feed roller, the conveying force acts on the second and subsequent paper sheets, and the paper sheet is conveyed. Even in the case of paper sheets, the pre-feed roller is provided at a position where buckling does not occur, so that the pre-feed function occurs but does not cause a failure.

  Next, there is a second case in which the conveying force is applied to the paper sheet 201 from both the pickup roller 202 and the feed roller 203. At this time, the uppermost sheet 201A of the accumulated sheets 201 has a leading end portion due to the conveying force of the high friction part 202A of the pickup roller 202 and the high friction part 203A of the feed roller 203 as shown in FIG. Enter the overlap area. At this time, even if the second and subsequent sheets are taken out at the same time as the first sheet, the second and subsequent sheets are not fed out by the conveyance resistance force of the gate roller 204.

  The first sheet 201A is further conveyed and conveyed to the conveying roller 205. Then, the third state where the conveying force of only the conveying roller 205 acts is brought about, and the first sheet is fed out from the separation mechanism 2.

FIG. 16 is a diagram showing the skew correction operation in the fourth and fifth states.
In FIG. 16, when the trailing edge of the first sheet passes through the pickup roller 202, the sheet 201B (shown in FIG. 16 (a)) to be fed next has the next high friction of the pickup roller 202. A transport force from the section 202B acts and a fourth state is reached. And the front-end | tip part of the paper sheet 201B approachs an overlap part. The paper sheet 201B is not transported to the transport roller 205 because the length LpB (shown in FIG. 11) of the high friction portion 202B of the pick-up roller 202 is set to the above-described dimension. Does not occur.

  Next, when the conveying force from the next high friction portion 202B of the pickup roller 202 is lost, the paper sheet 202B is in the fifth state in which only the force from the gate roller 204 acts on the overlap portion. At this time, when the gate roller 204 is rotated in the direction opposite to the feeding direction, the paper sheet 201B is fed back into the box 207 shown in FIG. At this time, the paper sheets that are not skewed are conveyed as they are in the direction of the box 207. However, as shown in FIG. When the paper sheet 201B passes through the overlap portion, a rotational moment due to a couple is generated in the paper sheet 201B due to the conveying force generated by the other overlap portion. At this time, since the pickup roller 202 is not in contact with the paper sheet 201B as described above, the paper sheet 201B is rotated by the rotational moment as shown in FIG. 16B, and the skew of the paper sheet is corrected. The

  The gate roller 204 may be driven intermittently only in the fifth state, but may be continuously reversed. Even when the gate roller 204 is reversely rotated, the material is selected so that the conveying force of the high friction portion of the pickup roller 202 and the feed roller 203 has a conveying force for normally conveying paper sheets. .

  This skew correction function at the overlap portion is effective when the skew correction by the preliminary feed roller 208 is insufficient or impossible. As a case where skew correction is impossible, for example, a small-sized paper sheet is in a position where it does not come into contact with the pre-feed roller 208 while being skewed, or it is taken out to a pre-separated and fed paper sheet. In some cases, the feed roller 208 may not be in contact with the feed roller 208.

  In the present embodiment, an example in which a place where the conveyance resistance force acts between the brake pads 209 and 210 and the paper sheet 201 is provided in the middle portion of the left and right rollers is shown. It may be provided anywhere as long as the moment is generated. The range in which the moment for performing the skew correction is the same as S shown in FIG. That is, in the case of the brake pad 209, the contact range with the paper sheet 201 includes a straight line connecting the rotation axis centers of the left and right auxiliary feed rollers 208, a straight line in the rotation direction of the left and right auxiliary feed rollers 208, and the left and right auxiliary feed rollers. A straight line connecting the rotation axis center of the preliminary conveyance roller to a position in the conveyance direction of the paper sheet for skew correction from the straight line connecting the rotation axis center of the conveyance roller to the downstream side in the conveyance direction of the paper sheet. A range surrounded by parallel straight lines.

In the case of the brake pad 210, the contact position range with the paper sheet 201 includes a straight line connecting the rotation axis centers of the left and right gate rollers 204, a straight line in the rotation direction of the left and right gate rollers 204, and the left and right gates. Connect the rotation axis center of the gate roller to the position in the conveyance direction of the paper sheet for skew correction from the straight line connecting the rotation axis center of the roller to the upstream side (box side) in the conveyance direction of the paper sheet. A range surrounded by a straight line parallel to the straight line.

  As described above, according to the present invention, it is possible to correct the skew without generating a compressive force that tends to cause buckling in the in-plane direction of the skewed paper sheets to be separated. Therefore, in an apparatus that handles a wide variety of types and states of paper sheets to be handled, it is possible to realize a paper sheet separation mechanism that does not cause any trouble during skew correction.

  In the first embodiment and the second embodiment, in order to correct the skew of the paper sheet, there is a transport means that applies a transport force to the left and right positions in the width direction of the paper sheet, and an intermediate portion between these transport means. However, the conveyance resistance means called the brake pad for applying the conveyance resistance force to the paper sheet is provided, but these conveyance means and conveyance resistance means are limited to the rollers and pads described in the first and second embodiments. Of course not. As the conveying means, there are, for example, one that sandwiches paper sheets with a belt and a roller, and one that sandwiches paper sheets between belts. In addition, a roller or a belt can be considered as the conveyance resistance means.

  FIG. 17 is a diagram illustrating an example in which a roller is used instead of a brake pad as the conveyance resistance means of the overlap portion in the case of the second embodiment.

  In FIG. 17, a brake roller 220 as a conveyance resistance means is rotatably attached to a shaft 203S, and the outer peripheral surface thereof is made of a material that hardly causes a frictional force to act on paper sheets. Further, the brake roller 220 is in contact with another brake roller 221 fixedly attached to the shaft 204S, and the outer peripheral portion of the roller 221 is made of a material that exerts a friction force that is not so great on the paper sheet. It is configured. The brake roller 220 may be attached to the shaft 203S via a torque limiter 220T on which a light load acts during rotation. The torque at this time is set to a value smaller than the conveying force acting on the paper sheets in the second state. In this mechanism, the skew correction is performed on the same principle as that shown in the second embodiment.

It is a figure which shows the paper sheet skew correction mechanism provided with one Example. It is a figure which shows the paper sheet skew correction mechanism provided with one Example. FIG. 6 is a diagram illustrating a state in which a skewed paper sheet is conveyed to a skew correction mechanism. It is the figure which showed the contact position of the brake pad which can carry out skew correction, and paper sheets. It is the figure which provided the skew correction mechanism provided with one Example in the conveyance path. It is the figure which applied the skew feeding correction mechanism provided with one Example to the separation mechanism of various sizes of paper sheets. It is explanatory drawing which looked at the preliminary | backup feed roller part from upper direction. It is explanatory drawing of the feeding operation | movement of a paper sheet separation and accumulation mechanism. It is explanatory drawing for roller arrangement | positioning. It is explanatory drawing of a roller. It is explanatory drawing of a roller. It is the figure which showed the generation | occurrence | production state of the conveyance force of each roller at the time of isolation | separation operation | movement. It is explanatory drawing of the initial position of a paper sheet separation and accumulation mechanism. It is explanatory drawing of skew correction. It is explanatory drawing of skew correction. It is explanatory drawing of skew correction. It is another figure which applied the skew feeding correction mechanism provided with one Example to the separation mechanism of various sizes of paper sheets. It is explanatory drawing of the conventional skew feeding correction mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Paper sheet skew correction mechanism, 2 ... Paper sheet separation apparatus, 101 ... Conveyance roller, 103, 105, 211 ... Driven roller, 106, 209, 212 ... Brake pad, 107 ... Spring member, 108 ... Conveyance Guide, 201 ... paper sheets, 202 ... pickup roller, 203 ... feed roller, 204 ... gate roller, 205 ... conveying roller, 206 ... stack, 207 ... box, 208 ... preliminary feed roller, 210 ... spring means.

Claims (2)

In order to apply a conveying force in a predetermined conveying direction for the paper sheet, at least two or more conveying means installed on the same axis, and a brake pad for applying a conveying resistance force to the paper sheet on the downstream side of the conveying means. In the paper sheet separating apparatus provided,
The brake pad is provided between the conveying means, the brake pad imparts resistance to the skewed paper sheet, and the conveying means applies a conveying force to the end of the paper sheet to correct skewing. And
A second conveying means disposed downstream of the conveyance means, it is provided the brake pad to said conveyance means,
Said second conveying means to said conveyance means includes a gap portion which does not sandwich the paper sheet being transported, the transportable said When feeding means has finished conveying the second conveying means starts conveying Characteristic paper sheet separating device. In the paper sheet separating apparatus according to claim 1,
The paper sheet separating apparatus, wherein the gap formed in the second conveying means is formed by a high friction member provided at a part of the outer periphery.

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