Patent Publication Number: US-6042110-A

Title: Bill alignment device for bill handling machine

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a bill alignment device for a bill handling machine and particularly to such a device which can align even bills having extremely low rigidity and apt to be bent along a reference surface, while the bills are being transported. 
     DESCRIPTION OF THE PRIOR ART 
     Japanese Patent Application Laid Open No. 60-211588 discloses a form alignment device comprising a feed roller for transporting forms in a predetermined transport direction and a pressure roller whose axis forms an angle θ with the axis of the feed roller for holding the forms between the feed roller and itself and feeding the forms toward a reference wall along which the forms are to be aligned and is adapted to feed the forms toward the reference wall by holding the forms between the feed roller and the pressure roller whose axis forms an angle θ with the axis of the feed roller and feeding the forms, thereby aligning the forms along the reference wall, while the forms are being transported. 
     However, in the thus constituted form alignment device, since the form is aligned along the reference wall while it is being held between the pressure roller and the feed roller, in the case of applying the device for aligning a bill such as one circulated for a long time having extremely low rigidity and apt to be bent along the reference wall while it is being transported, the bill is bent by the force applied from the pressure roller thereto after the bill was aligned along the reference wall and, therefore, it is difficult to align such bills along the reference wall. 
     SUMMARY OF THE INVENTION 
     It is therefore an object of the present invention to provide a bill alignment device for a bill handling machine which can align even bills having extremely low rigidity and apt to be bent along a reference surface, while the bills are being transported. 
     The above and other objects of the present invention can be accomplished by a bill alignment device for a bill handling machine comprising a reference surface provided at one side portion of a bill transport passage in parallel thereto and along which bills are to be aligned, at least one support shaft disposed to form a predetermined angle with the reference surface so that a cross point between an axis thereof and the one side portion of the bill transport passage is positioned upstream of a cross point between the axis thereof and the other side portion of the bill transport passage, a pair of transport rollers eccentrically mounted on the at least one support shaft and spaced from each other, and a guide plate having concave portions facing the pair of transport rollers and adapted to guide the bills on an upper surface thereof, the pair of transport rollers being mounted on the at least one support shaft so that rotation positions where degree of eccentricity is maximum are offset from each other by 180 degrees, that a part of each of the pair of transport rollers is positioned in one of the concave portions when the rotation position where degree of eccentricity is maximum is directed downward and that the smallest clearance between a circumference of each of the pair of transport rollers and the upper surface of the guide plate exceeds the thickness of one bill when the rotation position where the degree of eccentricity is maximum is directed upward. 
     In a preferred aspect of the present invention, the smallest clearance between a circumference of each of the pair of transport rollers and the upper surface of the guide plate is determined to be greater than double the thickness of one bill when the rotation position where the degree of eccentricity is maximum is directed upward. 
     In a further preferred aspect of the present invention, the bill alignment device comprises two or more support shafts and the pair of transport rollers are eccentrically mounted on each of the support shafts so as to be spaced from each other. 
     In a further preferred aspect of the present invention, the pairs of transport rollers are mounted on the support shaft so that the transport rollers mounted on the adjacent support shafts and aligned with each other in the bill transport direction are fixed to the support shafts so that the rotation positions where the degree of eccentricity is maximum is are offset from each other by 90 degrees. 
     In a further preferred aspect of the present invention, a second guide plate is further provided above and in parallel to the guide plate and the pair of transport rollers face the guide plate via openings formed in the second guide plate. 
     The above and other objects and features of the present invention will become apparent from the following description made with reference to the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a schematic plan view of a bill alignment device which is an embodiment of the present invention. 
     FIG. 2 is a schematic cross-sectional view taken along the line A--A in FIG. 1. 
     FIG. 3 is a schematic partially broken and cross-sectional view taken along the line B--B in FIG. 1. 
     FIG. 4 is a schematic cross-sectional view taken along the line C--C in FIG. 1. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     As shown in FIGS. 1 and 2, a bill alignment device 1 includes an upper guide plate 2 and a lower guide plate 3 disposed so as to face each other and a bill transport passage is formed between the upper guide plate 2 and the lower guide plate 3. The lower guide plate 3 comprises a rectangular lower plate 5 whose longer edge is parallel to a bill transport direction indicated by an arrow X in FIG. 1, a side plate 6 extending from one of the side edges of the lower plate 5 parallel to the bill transport direction, and an upper plate 7 extending in parallel to the lower plate 5 from the upper end portion of the side plate 6 toward the other side edge of the lower plate 5 parallel to the bill transport direction so that the lower surface 7a thereof lies flush with the lower surface 2a of the upper guide plate 2. In this embodiment, since bills are transported in such a manner that their longer edges coincide with the bill transport direction, the width of the lower plate 5 in the direction perpendicular to the bill transport direction is made slightly greater than the width of bills having the greatest width among bills to be handled. The upper surface 5a of the lower plate 5 of the lower guide plate 2 serves as a support surface for supporting bills and the inner surface 6a of the side plate 6 forms a reference surface along which bills are to be aligned. Further, the lower surface 7a of the upper plate 7 and the lower surface 2a of the upper guide plate 2 prevent bills from being bent. 
     As shown in FIGS. 1 to 4, the upper guide plate 2 is disposed in parallel to the lower guide plate 3 and has a substantially rectangular shape whose longer edges are parallel to the bill transport direction. The upper guide plate 2 is formed with a cut portion 2b at one of side edge portions thereof parallel to the bill transport direction, which corresponds to the upper plate 7 of the lower guide plate 3. The width of the upper guide plate 2 in the direction perpendicular to the bill transport direction is determined to be slightly greater than that of bills having the maximum width to be handled. 
     As shown in FIGS. 1, 3 and 4, the upper guide plate 3 is formed with rectangular shaped openings 10a, 11a, 10b, 11b, 10c, 11c, 10d, 11d. The openings 10a, 11a, the openings 10b, 11b, the openings 10c, 11c and the openings 10d, 11d respectively form pairs and are formed so that the longer edges thereof are parallel to each other and each of straight lines connecting the centers thereof forms an angle of θ with the bill transport direction. The openings 10a, 10b, 10c and 10d are formed so that their positions in the direction perpendicular to the bill transport direction coincide with each other and the spaces between the openings 10a and 10b, the openings 10b and 10c and the openings 10c and 10d are made to be equal to each other. Similarly, The openings 11a, 11b, 11c and 11d are formed so that their positions in the direction perpendicular to the bill transport direction coincide with each other and the spaces between the openings 11a and 11b, the openings 11b and 11c and the openings 11c and 11d are made to be equal to each other. 
     The upper guide plate 2 and the lower plate 5 of the lower guide plate 3 are further formed with a plurality of apertures 12 for allowing light emitted from light emitting elements of optical sensors (not shown) for detecting bills immediately before they reach the openings 10a, 11a, 10b, 11b, 10c, 11c, 10d, 11d to pass and be received by light receiving elements. 
     Support shafts 13a, 13b, 13c, 13d are provided above each of the openings 10a, 11a, the openings 10b, 11b, the openings 10c, 11c and the openings 10d, 11d respectively, so that each of them extends in a plane perpendicular to the upper guide plate 2 and containing a straight line each connecting the centers of openings 10a, 11a, the openings 10b, 11b, the openings 10c, 11c or the openings 10d, 11d and in parallel to the upper guide plate 2. One end portion of each support shaft 13a, 13b, 13c or 13d is rotatably supported by a support block 14a, 14b, 14c or 14d each fixed to the body of the bill handling machine outside of the side plate 6 of the lower guide plate 3. Each of the support shafts 13a, 13b, 13c, 13d forms an angle of θ with the bill transport direction. 
     Pulleys 15a, 15b, 15c, 15d of equal diameters are fixed to the portions of the support shafts 13a, 13b, 13c, 13d projecting from the support blocks 14a, 14b, 14c, 14d opposite to the upper guide plate 2 and the lower guide plate 3 and round belts 16 are wound around the adjacent pulleys 15a, 15b, 15c, 15d. A pulley 17 having a greater diameter is fixed to the pulley 15d positioned most downstream and is connected to the rotation shaft of a motor (not shown) via a round belt 18. Thus, when the motor is driven, all of the support shafts 13a, 13b, 13c, 13d are rotated in the same direction and at the same speed. 
     As shown in FIGS. 3 and 4, pairs of transport rollers 20a and 21a, 20b and 21b, 20c and 21c, and 20d and 21d are fixed to the support shafts 13a, 13b, 13c, 13d, respectively. The transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d are fixed to the associated support shafts 13a, 13b, 13c, 13d so as to be eccentric and be spaced from each other. The transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d are each constituted by winding a round belt 24, 25 around an eccentric pulley 22, 23 so as to have the equal diameters and are fixed to the support shafts 13a, 13b, 13c, 13d so that the degrees of eccentricity thereof are the same. The transport rollers 20a, 20b, 20c and 20d are disposed so as to face the lower plate 5 of the lower guide plate 3 via the openings 10a, 10b, 10c, 10d and a part thereof is positioned in the openings 10a, 10b, 10c, 10d. The transport rollers 21a, 21b, 21c and 21d are disposed so as to face the lower plate 5 of the lower guide plate 3 via the openings 11a, 11b, 11c, 11d and a part thereof is positioned in the openings 11a, 11b, 11c, 11d. The eccentric pulleys 22, 23 are respectively fixed to the support shafts 13a, 13b, 13c, 13d by threads 28, 29 screwed into tread openings 26, 27 formed from rotation positions where the degrees of eccentricity are maximum toward the support shafts 13a, 13b, 13c, 13d. 
     As shown for the pair of transport rollers 20a and 21a in FIG. 4, the pairs of transport rollers 20a and 21a, 20b and 21b, 20c and 21c, and 20d and 21d fixed to the same support shafts 13a, 13b, 13c, 13d are fixed to the support shafts 13a, 13b, 13c, 13d so that the rotation positions where the degrees of eccentricity is maximum are offset by 180 degrees. 
     As shown for the transport rollers 20a, 20b in FIG. 3, the set of transport rollers 20a, 20b, 20c and 20d, and the set of transport rollers 21a, 21b, 21c and 21d fixed to the adjacent support shafts 13a, 13b, 13c, 13d are fixed to the support shafts 13a, 13b, 13c, 13d so that the rotation positions of the transport rollers of each set where the degrees of eccentricity are maximum are offset by 90 degrees. 
     Positions of the lower plate 5 of the lower guide plate 3 corresponding to the openings 10a, 11a, 10b, 11b, 10c, 11c, 10d, 11d are formed with concave portions 34a, 35a, 34b, 35b, 34c, 35c, 34d, 35d constituted by inclined surface portions 30a, 30b forming a predetermined angle with the upper surface 5a of the lower plate 5 and flat surface portions 32 parallel to the upper surface 5a of the lower plate 5. 
     The transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d are fixed to the support shafts 13a, 13b, 13c, 13d so that when the rotation position where the degree of eccentricity is maximum is directed downward, a part of each of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d projects downward from the upper surface 5a of the lower plate 5 and is located in the concave portion 34a, 35a, 34b, 35b, 34c, 35c, 34d, 35d. On the other hand, the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d are fixed to the support shafts 13a, 13b, 13c, 13d so that when the rotation position where the degree of eccentricity is maximum is directed upward, the smallest clearance between the circumference of each of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d and the upper surface 5a of the lower plate 5 is greater than double the thickness of bills to be handled. Further, the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d are fixed to the support shafts 13a, 13b, 13c, 13d so that when the rotation position where the degree of eccentricity is maximum is located at the position where each of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d is rotated by 90 degrees from the position where the rotation position where the degree of eccentricity is maximum is directed downward or the position where the rotation position where the degree of eccentricity is maximum is directed upward, the smallest clearance between the circumference of each of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d and the upper surface 5a of the lower plate 5 is about equal to or greater than the thickness of one bill to be handled. The thickness of one bill is generally 0.09 to 0.1 mm. Therefore, in this embodiment, the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d are fixed to the support shafts 13a, 13b, 13c, 13d so that the degree of eccentricity of each is determined to be 0.3 mm, that each projects from the upper surface 5a of the lower plate 5 by 0.1 mm when the rotation position where the degree of eccentricity is maximum is directed downward, that the smallest clearance between the circumference of each and the upper surface 5a of the lower plate 5 is determined to be 0.5 mm when the rotation position where the degree of eccentricity is maximum is directed upward, and that the smallest clearance between the circumference of each and the upper surface 5a of the lower plate 5 is determined to be 0.2 mm when the rotation position where the degree of eccentricity is maximum is located at the position where each of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d is rotated by 90 degrees from the position where the rotation position where the degree of eccentricity is maximum is directed downward or the position where the rotation position where the degree of eccentricity is maximum is directed upward. 
     The thus constituted bill alignment device 1 of the bill handling machine aligns bills along the inner surface 6a of the side plate 6 of the lower guide plate 3 constituting a reference surface, while transporting bills. 
     When the motor (not shown) is driven, the driving force of the motor is transmitted to the support shafts 13a, 13b, 13c, 13d via the pulley 17 and the pulleys 15a, 15b, 15c, 15d, thereby rotating the support shafts 13a, 13b, 13c, 13d counterclockwise in FIG. 3. 
     A bill fed into a portion between the upper guide plate 2 and the lower guide plate 3 is guided on the upper surface 5a of the lower plate 5 of the lower guide plate 3 and fed to a portion between the transport rollers 20a, 21a and the lower plate 5 of the lower guide plate 3. Since the transport rollers 20a, 21a are fixed to the support shaft 13a so that the rotation positions where the degree of eccentricity is maximum of the transport rollers 20a, 21a are offset by 180 degrees, the bill is pushed into one of the concave portions 34a, 35a by one of the transport rollers 20a, 21a as the support shaft is rotated, whereby the bill is transported by a frictional force produced between itself and one of the transport rollers 20a, 21a. Since the shaft 13a extends at an angle of θ with the bill transport direction, the bill is transported in the bill transport direction while being urged toward the inner surface 6a of the side plate 6 of the lower guide plate 3 constituting a reference surface. When the support shaft 13a has been rotated by 180 degrees, the bill is pushed into the concave portions 34a, 35a by the other of the transport rollers 20a, 21a, whereby the bill is transported in the bill transport direction while being urged toward the inner surface 6a of the side plate 6 of the lower guide plate 3 constituting the reference surface. 
     The bill is further fed into a portion between the transport rollers 20b, 21b and the lower plate 5 of the lower guide plate 3 and is pushed by one of the transport roller 20b or 21b into the corresponding concave portions 34b, 35b as the support shaft 13b is rotated, whereby the bill is transported in the bill transport direction while being urged toward the inner surface 6a of the side plate 6 of the lower guide plate 3 constituting the reference surface. When the support shaft 13b has been rotated by 180 degrees, the bill is pushed by the other transport roller 20b or 21b into the corresponding concave portion 34b, 35b, whereby the bill is transported in the bill transport direction while being urged toward the inner surface 6a of the side plate 6 of the lower guide plate 3 constituting the reference surface. 
     Similarly, the bill is further transported in the bill transport direction by the transport rollers 20c, 21c and 20d, 21d while being urged toward the inner surface 6a of the side plate 6 of the lower guide plate 3 constituting the reference surface, whereby the bill is aligned so that the longer edge thereof is aligned along the inner surface 6a of the side plate 6 of the lower guide plate 3 constituting the reference surface. In this manner, in this embodiment, the bill is pushed by the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d, 21d into the corresponding concave portions 34a, 35a, 34b, 35b, 34c, 35c, 34d, 35d and is merely fed toward the inner surface 6a of the side plate 6 of the lower guide plate 3 by a frictional force produced between the bill and the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d, 21d, while it is being transported in the bill transport direction. Therefore, since no excess force is applied to the bill which has been aligned so that the longer edge is aligned along the inner surface 6a of the side plate 6 of the lower guide plate 3, it is possible to prevent aligned bills from being folded or bent and to align bills so that their longer edges are aligned along the inner surface 6a of the side plate 6 of the lower guide plate 3. Further, since each of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d, 21d is constituted by winding the round belt 24 or 25 around the eccentric pulley 22 or 23, the area of a bill which each of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d, 21d contact is small. Therefore, since no excess force is applied to the bill, it is possible to reliably prevent aligned bills from being folded or bent and to align bills so that their longer edges are aligned along the inner surface 6a of the side plate 6 of the lower guide plate 3. 
     In this embodiment, the members of each pair of transport rollers 20a and 21a, 20b and 21b, 20c and 21c, 20d and 21d fixed to the common support shaft 13a, 13b, 13c or 13d are fixed to the support shaft 13a, 13b, 13c or 13d so that the rotation positions where the degree of eccentricity is maximum are offset from each other and when the bill is pushed into the concave portions 34a, 34b, 34c and/or 34d by the transport rollers 20a, 20b, 20c and/or 20d, the smallest clearances between the circumferences of the transport rollers 20a, 20b, 20c and/or 20d and the upper surface 5a of the lower plate 5 are determined to be greater than double the thickness of the bill. Further, the transport rollers 20a, 20b, 20c, 20d, 21a, 21b, 21c, 21d fixed to the support shafts 13a, 13b, 13c, 13d and aligned in the bill transport direction fixed to the support shafts 13a, 13b, 13c, 13d so that the rotation positions where the degree of eccentricity is maximum are offset from each other by 90 degrees and when the rotation position where the degree of eccentricity is maximum is located at the position where each of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d is rotated by 90 degrees from the position where the rotation position where the degree of eccentricity is maximum is directed downward or the position where the rotation position where the degree of eccentricity is maximum is directed upward, the smallest clearance between the circumference of each of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d and the upper surface 5a of the lower plate 5 is greater than about the thickness of one bill to be handled. Therefore, when the bill is pushed into the concave portion 34a by the transport roller 20a, no force is applied to the bill from the transport roller 21a and the transport roller 21a fixed to the adjacent support shaft 13b. Accordingly, after a part of the bill abutted against the inner surface 6a of the side plate 6 of the lower guide plate 3 constituting the reference surface, the bill can turn so that the longer edge thereof is aligned along the inner surface 6a of the side plate 6, thereby enabling the bill to be aligned so that the longer edge thereof is aligned along the inner surface 6a of the side plate 6 of the lower guide plate 3 constituting the reference surface. 
     According to the above described embodiment, the bill is pushed by the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d, 21d into the corresponding concave portions 34a, 35a, 34b, 35b, 34c, 35c, 34d, 35d and is merely fed toward the inner surface 6a of the side plate 6 of the lower guide plate 3 by a frictional force produced between the bill and the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d, 21d, while it is being transported in the bill transport direction. Therefore, since no excess force is applied to the bill which has been aligned so that the longer edge is aligned along the inner surface 6a of the side plate 6 of the lower guide plate 3, it is possible to prevent aligned bills from being folded or bent and to align bills so that their longer edges are aligned along the inner surface 6a of the side plate 6 of the lower guide plate 3. Further, in the above described embodiment, the members of each pair of transport rollers 20a and 21a, 20b and 21b, 20c and 21c, 20d and 21d fixed to the common support shaft 13a, 13b, 13c or 13d are fixed to the support shaft 13a, 13b, 13c or 13d so that the rotation positions where the degree of eccentricity is maximum are offset from each other and when the bill is pushed into the concave portions 34a, 34b, 34c and/or 34d by the transport rollers 20a, 20b, 20c and/or 20d, the smallest clearances between the circumferences of the transport rollers 20a, 20b, 20c and/or 20d and the upper surface 5a of the lower plate 5 are determined to be greater than double the thickness of the bill. Further, the transport rollers 20a, 20b, 20c, 20d, 21a, 21b, 21c, 21d fixed to the support shafts 13a, 13b, 13c, 13d and aligned in the bill transport direction are fixed to the support shafts 13a, 13b, 13c, 13d so that the rotation positions where the degree of eccentricity is maximum are offset from each other by 90 degrees and when the rotation position where the degree of eccentricity is maximum is located at the position where each of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d is rotated by 90 degrees from the position where the rotation position where the degree of eccentricity is maximum is directed downward or the position where the rotation position where the degree of eccentricity is maximum is directed upward, the smallest clearance between its circumference of each of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d and the upper surface 5a of the lower plate 5 is greater than about the thickness of one bill to be handled. Therefore, when the bill is pushed into the concave portion 34a by the transport roller 20a, no force is applied to the bill from the transport roller 21a and the transport roller 21a fixed to the adjacent support shaft 13b. Accordingly, after a part of the bill abutted against the inner surface 6a of the side plate 6 of the lower guide plate 3 constituting the reference surface, the bill can turn so that the longer edge thereof is aligned along the inner surface 6a of the side plate 6, thereby enabling the bill to be aligned so that the longer edge thereof is aligned along the inner surface 6a of the side plate 6 of the lower guide plate 3 constituting the reference surface. Moreover, in the above described embodiment, since each of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d, 21d is constituted by winding the round belt 24 or 25 around the eccentric pulley 22 or 23, the area of a bill which each of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d, 21d contact is small. Therefore, since no excess force is applied to the bill, it is possible to reliably prevent aligned bills from being folded or bent and to align bills so that their longer edges are aligned along the inner surface 6a of the side plate 6 of the lower guide plate 3. 
     The present invention has thus been shown and described with reference to specific embodiments. However, it should be noted that the present invention is in no way limited to the details of the described arrangements but changes and modifications may be made without departing from the scope of the appended claims. 
     For example, in the above described embodiment, although four support shafts 13a, 13b, 13c, 13d each provided with a pair of transport rollers 20a and 21a, 20b and 21b, 20c and 21c, 20d and 21d are provided, the number of the support shafts may be arbitrarily selected considering how parts of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d, 21d project from the upper surface 5a of the lower plate 5 when the rotation position where the degree of eccentricity is maximum is directed downward and the like. 
     Further, in the above described embodiment, although the round belts 16, 18 are used for transmitting the drive force of the motor, it is possible to transmit the drive force of the motor by threading the pulleys 15a, 15b, 15c, 15d and the pulley 17 and winding timing belts therearound. 
     Furthermore, in the above described embodiment, although the transport rollers 20a, 20b, 20c, 20d, 21a, 21b, 21c, 21d fixed to the adjacent support shafts 13a, 13b, 13c, 13d and aligned in the bill transport direction are fixed to the support shafts 13a, 13b, 13c, 13d so that the rotation positions where the degree of eccentricity is maximum are offset from each other by 90 degrees, they may be fixed so that the rotation positions where the degree of eccentricity is maximum are offset from each other by 180 degrees or are not offset. 
     Moreover, in the above described embodiment, the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d are fixed to the support shafts 13a, 13b, 13c, 13d so that when the rotation position where the degree of eccentricity is maximum is directed upward, the smallest clearance between the circumference of each of the transport rollers 20a, 21a, 20b, 21b, 20c, 21c, 20d and 21d and the upper surface 5a of the lower plate 5 is greater than double the thickness of bills to be handled. However, it is sufficient for the smallest clearance between the circumference thereof and the upper surface 5a of the lower plate 5 to be greater than the thickness of bills to be handled and it is not absolutely necessary to determine the clearance to be greater than double the thickness of the bills. 
     According to the present invention, it is possible to provide a bill alignment device for a bill handling machine which can align even bills having extremely low rigidity and apt to be bent along a reference surface, while the bills are being transported.