EP1785950A1

EP1785950A1 - Paper sheet break detection apparatus

Info

Publication number: EP1785950A1
Application number: EP06021546A
Authority: EP
Inventors: Masashi Nakada
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 2005-10-21
Filing date: 2006-10-13
Publication date: 2007-05-16
Also published as: US20070090592A1; JP2007115095A; CN1952983A

Abstract

A paper sheet break detection unit having a light source (18) which emits light to a card (K) deformed by the pressure of a flange (15f, 15f') of a front-side upper roller (15a, 15a') and a flange (16f, 16f') of a back-side lower roller (16a, 16a'), a control unit which judges that a card (K) includes a break, based on the reception of the light by a light-receiving sensor (19), and a moving mechanism which moves the flange (15f, 15f') of the upper roller (15a, 15a') and the flanges (16f, 16f') of the lower roller (16a, 16a') along a conveying surface in a direction orthogonal to a direction of conveying a card K, by moving the upper roller (15a, 15a') and lower roller (16a, 16a').

Description

The present invention relates to a paper sheet break detection unit, which detects a break in a paper sheet, for example, paper currency.
A unit shown in FIG. 20 is well known as such a detection unit.
Namely, a reference numeral 111 denotes a conveying path. Upper- side conveying rollers 112a and 112b are provided at a predetermined interval on the upper side of the conveying path 111, and lower- side conveying rollers 113a and 113b are provided on the lower side at a predetermined interval. An upper conveying belt 114a is extended over the upper- side conveying rollers 112a and 112b, and a lower-side conveying belt 114b is extended over the lower- side conveying rollers 113a and 113b. These upper and lower conveying belts 114a and 114b hold and convey a paper sheet.
Between the upper- side conveying rollers 112a and 112b, a roller 115 having a flange 115f and a projection plate 116 are provided. The roller 115 is placed with the lower end side of the flange 115 projected downward the conveying path 111, and the projection plate 116 is placed with the upper-end side projected upward the conveying path 111. A light source 118 is provided under the projection plate 116. A light-receiving sensor 119, which receives the light emitted from the light source 118, is provided between the roller 115 and upper-side conveying roller 112b.
When a paper sheet is conveyed along the direction of the arrow and reaches the projection plate 16, the paper sheet is pressed upward by the projection plate 16, and pressed downward by the flange 115f when reaching the roller 15. Therefore, if there is a break in a paper sheet, the break is pressed and opened, and the light emitted from the light source 118 is received by the light-receiving sensor 119, passing through the break. When the light is received, it is judged that the paper sheet has a break. If the light is not received, it is judged that the paper sheet does not have a break. (Refer to Jpn. Pat. Appln. KOKAI Publication No. 2000-268225 , for example.)
However, conventionally, as the projection plate 116 is fixedly provided, there is a drawback that when a paper sheet is conveyed at high speed to the projection plate 116, the projection plate 116 is worn, and a break of an easy-to-tear paper sheet is not opened.
Further, as the roller 115 and projection plate 116 are provided at fixed positions, when a different size paper sheet is conveyed, the flange 115f of roller 115 and the projection plate 16 may come off the break of the paper sheet, and the break cannot be detected.
Further, when detecting a break in the same size paper sheet, it is impossible to adjust so that only a break longer than a predetermined length is detected. Therefore, there is a problem that even a negligible break is detected.
The present invention has been made in the above-mentioned circumstances. Accordingly, it is an object of the invention to provide a paper sheet break detection unit, which reliably detects a break even in a different size paper sheet.
According to an aspect of the invention, there is provided a paper sheet break detection unit comprising a conveying unit which conveys a paper sheet along a conveying surface; a first pressing unit which presses one side of the paper sheet conveyed by the conveying unit in a first direction orthogonal to the conveying surface; a second pressing unit which is provided in proximity to the first pressing unit, and presses the other side of the paper sheet conveyed by the conveying unit in a second direction reverse to the first direction; a light-emitting unit which emits light to the paper sheet deformed by the pressure of the first and second pressing units; a light-receiving unit which receives the light illuminated from the light-emitting unit; a judgment unit which judges whether the paper sheet includes a break based on the reception of the light by the light-receiving unit; and a moving mechanism which moves the first and second pressing units along the conveying surface in a direction orthogonal to a direction of conveying the paper sheet.
According to another aspect of the invention, a paper sheet break detection unit is capable of detecting securely a break in a different size paper sheet or in an easy-to-tear paper sheet, and capable of detecting only a break of desired length when detecting a break in the same size paper sheet.
The invention can be more fully understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic block diagram showing the configuration of a paper sheet processing system according to a first embodiment of the invention;
FIG. 2 is a front view of a paper sheet break detection unit incorporated in the paper sheet processing system of FIG. 1;
FIG. 3 is a top plane view of the paper sheet break detection unit of FIG. 2;
FIG. 4 is a longitudinal sectional view of the paper sheet break detection unit of FIG. 2;
FIG. 5 is a block diagram showing a control system of the paper sheet processing system of FIG. 1;
FIG. 6 is a front view showing the state that a card having no break is sent to the paper sheet break detection unit of FIG. 2;
FIG. 7 is a longitudinal sectional view showing the state that a card having no break is sent to the paper sheet break detection unit of FIG. 2;
FIG. 8 is a perspective view of a card having no break sent to the paper sheet break detection unit of FIG. 2;
FIG. 9 is a perspective view of a card having a break sent to the paper sheet break detection unit of FIG. 2;
FIG. 10 is a front view showing the state that the card of FIG. 9 is sent to the paper sheet break detection unit of FIG. 2;
FIG. 11 is a longitudinal section view showing the state that the card of FIG. 9 is sent to the paper sheet break detection unit of FIG. 2;
FIG. 12 is a view showing a sensor signal when the paper sheet break detection unit of FIG. 2 does not detect a break in a card;
FIG. 13 is a view showing a sensor signal when the paper sheet break detection unit of FIG. 2 detects a break in a card;
FIG. 14 is a view showing the state that a pair of upper-side rollers of the paper sheet break detection unit of FIG. 2 are moved in the direction of coming close to each other, and the state that a pair of lower-side rollers are moved in the direction of coming close to each other;
FIG. 15 is a view showing the state that a pair of upper-side rollers of the paper sheet break detection unit of FIG. 2 are moved in the direction of separating from each other, and the state that a pair of lower-side rollers are moved in the direction of separating from each other;
FIG. 16 is a view showing the state that when the paper sheet break detection unit of FIG. 2 detects a break in the same size card, pairs of upper-side and lower-side rollers are moved to the position to open a break;
FIG. 17 is a view showing the state that when the paper sheet break detection unit of FIG. 2 detects a break in the same size card, pairs of upper-side and lower-side rollers are moved to the position not to open a break shorter than a predetermined length;
FIG. 18 shows a paper sheet break detection unit according to a second embodiment of the invention, and is a view showing the state that a pair of upper-side air nozzles are moved in the direction of coming close to each other, and a pair of lower-side air nozzles are moved in the direction of coming close to each other;
FIG. 19 is a view showing that a pair of upper-side air nozzles are moved in the direction of separating from each other, and a pair of lower-side air nozzles are moved in the direction of separating from each other; and
FIG. 20 is a front view of a conventional card break detection unit.

Embodiments of the invention will be explained hereinafter with reference to the accompanying drawings.

(Embodiment 1)

FIG. 1 is a block diagram showing the configuration of a paper sheet processing system according to a first embodiment of the invention.
In FIG. 1, a reference numeral 1 denotes a take-out unit to take out stacked cards as paper sheets one by one. A card taken out by the take-out unit 1 is conveyed along a conveying path. In the conveying path, a detection unit 2 is provided to detect a break formed in a card. In the downstream side of the card conveying direction of the detection unit 2, a branch gate 3 is provided to guide a card with no break detected to a first direction and a card having a break detected to a second direction. A first stack 4 to stack a card with no break detected is provided in the first direction, a second stack 5 to stack a card having a break detected is provided in the second direction.
FIG. 2 is a front view of the detection unit 2. FIG. 3 is a top plane view of the detection unit. FIG. 4 is a longitudinal sectional view of the detection unit.
In FIG. 2, a reference numeral 11 denotes a conveying path. In the upper side of the conveying path 11, front- and back-side upper conveying rollers 12a and 12a' are provided with a predetermined space taken therebetween in the direction orthogonal to the card conveying direction. In the lower side of the conveying path 11, front- and back-side lower conveying rollers 13a and 13a' are provided with a predetermined space taken therebetween in the direction orthogonal to the card conveying direction.
In the downstream side of the card conveying direction of the front- and back-side upper conveying rollers 12a and 12a', and front- and back-side upper conveying rollers 12b and 12b' are provided. In the downstream side of the card conveying direction of the front- and back-side lower conveying rollers 13a and 13a', and front- and back-side lower conveying rollers 13b and 13b' are provided.
An upper conveying belt 14a is extended over the front-side upper conveying rollers 12a and 12b, and an upper conveying belt 14c is extended over the back-side upper conveying rollers 12a' and 12b'. A lower conveying belt 14b is extended over the front-side lower conveying rollers 13a and 13b, and a lower conveying belt 14d is extended over the back-side lower conveying rollers 13a' and 13b'. The conveying unit is composed of the upper conveying belt 14a/14c and lower conveying belt 14b/14d. In the card take-in side of the detection unit 2, a trigger sensor 8 is provided to detect a card taken in.
Different size cards K1, K2 and K3 are conveyed with one side held by the front-side upper conveying belt 14a and lower conveying belt 14b, and conveyed with the other side held by the back-side upper conveying belt 14c and lower conveying belt 14d. In this time, the cards are conveyed with the center aligned with the center between the front-side conveying belt 14a/14c and back-side conveying belt 14b/14d.
A front-side upper roller (a first roller) 15a is provided between the front-side upper conveying rollers 12a and 12b, and a back-side upper roller (a second roller) 15a' is provided between the back-side upper conveying rollers 12a' and 12b'. A flange 15f is provided in the front-side upper roller 15a, and a flange 15f' is provided in the back-side upper roller 15a'. The flanges 15f and 15f' of the upper rollers 15a and 15a' constitute a first pressing unit.
A front-side lower roller (a third roller) 16a is provided between the front-side lower conveying rollers 13a and 13b, and a back-side lower roller (a fourth roller) 16a' is provided between the back-side lower conveying rollers 13a' and 13b'. A flange 16f is provided in the front-side lower roller 16a, and a flange 16f' is provided in the back-side lower roller 16a'. The flanges 16f and 16f' of the lower rollers 16a and 16a' constitute a second pressing unit.
The lower side of the flange 15f/15f' of the upper roller 15a/15a' is projected downward the conveying path 11 by a predetermined amount, and the upper side of the flange 16f/16f' of the lower roller 16a/16a' is projected upward the conveying path 11 by a predetermined amount.
The upper rollers 15a and 15a' contact the upper side of the upper conveying belts 14a and 14c, and the lower rollers 16a and 16a' contacts the lower side of the lower conveying belts 14c and 14d. The upper roller 15a/15a' and lower roller 16a/16a' are rotated following the conveying belts 14a - 14d.
A linear light source 18 is provided as a light-emitting unit between the lower conveying rollers 13a/13a' and lower roller 16a/16a' along the direction orthogonal to the card conveying direction. A linear light-receiving sensor 19 is provided as a light receiver between the upper conveying roller 12b/12b' and upper roller 15a/15a' along the direction orthogonal to the card conveying direction. The light emitted from the linear light source 18 is received by the light-receiving sensor 19.
The above-mentioned upper roller 15a/15a' and lower roller 16a/16a' are moved by a moving mechanism 26 as shown in FIG. 3.
The upper rollers 15a and 15a' are freely rotated taking the sleeves 21a and 21a' as a rotation axis. The lower rollers 16a and 16a' are freely rotated taking the sleeves 21b and 21b' as a rotation axis.
The sleeves 21a and 21a' are screwed into a shaft 17a as a first drive shaft, and the sleeves 21b and 21b' are screwed into a shaft 17b as a second drive shaft. The outer surfaces of the shaft 17a and 17b are formed with a male screw inversely and symmetrically with respect to the centerline of the conveying path 11. The inner surfaces of the sleeves 21a, 21a' and 21b, 21b' are formed with a female screw to engage with the male screw of the shafts 17a and 17b.
The above-mentioned shafts 17a and 17b are provided along the card conveying surface and in the direction orthogonal to the card conveying direction, and are arranged to move the upper roller 15a/15a' and lower roller 16a/16a' along the card conveying surface and in the direction orthogonal to the card conveying direction.
When the above-mentioned shaft 17a is rotated forward, the upper rollers 15a and 15a' are moved together with the sleeves 21a and 21a' in the direction of coming close to each other, and the distance between the flanges 15f and 15f' is narrowed.
When the shaft 17b is rotated forward, the lower rollers 16a and 16a' are moved together with the sleeves 21b and 21b' in the direction of coming close to each other, and the distance between the flanges 16f and 16f' is narrowed.
When the shaft 17a is rotated backward, the upper rollers 15a and 15a' are moved together with the sleeves 21a and 21a' in the direction of separating from each other, and the distance between the flanges 15f and 15f' is widened.
When the shaft 17b is rotated backward, the lower rollers 16a and 16a' are moved together with the sleeves 21b and 21b' in the direction of separating from each other, and the distance between the flanges 16f and 16f' is widened.
Ends of the shaft 17a and 17b penetrate through a base 7, and are connected through a toothed pulley 22a, a toothed belt 23 and a toothed pulley 22b constituting an interlock mechanism. One end of the shaft 17a is directly connected to a drive motor 24, which rotates forward and backward. The shafts 17a and 17b are simultaneously rotated in the forward and backward directions by the forward/backward rotation of the drive motor 24.
FIG. 5 is a block diagram of the control system of the paper sheet processing system.
In FIG. 5, a reference numeral 20 denotes a control unit. The control unit 20 is connected with a trigger sensor 8 and a light-receiving sensor 19 through a transmission circuit. The control unit 20 controls the operation of the branch gate 3, based on detection signals sent from the trigger sensor 8 and light-receiving sensor 19.
Namely, the control unit 20 judges that a card has no break as shown in FIG. 8, based on the detection signal shown in FIG. 12 from the light-receiving sensor 19. The control unit 20 judges that a card has a break a as shown in FIG. 9, based on the detection signal shown in FIG. 13 from the light-receiving sensor 19.
The control unit 20 operates the branch gate 3 to send a card K having no break to the first stack 4, and send a card K having a break a to the second stack 5. A break in a card also includes defects in addition to a simple break.
Next, a description will be given on a method of detecting a break in a card.
A card K is conveyed with one side held by the front-side upper conveying belt 14a and lower conveying belt 14b, and conveyed with the other side held by the back-side upper conveying belt 14c and lower conveying belt 14d, as shown in FIG. 6/FIG. 7 or FIG. 10/FIG. 11. The card K is detected by the trigger sensor 8, and one side is fed to between the front-side upper roller 15a and lower roller 16a, and the other side is fed to between the back-side upper roller 15a' and lower roller 16'. In this time, one side of the card K is pushed upward by the flange 16f of the front-side lower roller 16a, the other side is pushed upward by the flange 16f' of the back-side lower roller 16a', one side of the card K is pushed downward by the flange 15f of the front-side upper roller 15a, and the other side is pushed downward by the flange 15f' of the back-side upper roller 15a.
Therefore, the card K is deformed like a step viewed from the conveying direction, and passes through the light from the light source 18, just like interrupting the light. In this time, when a predetermined dark signal as shown in FIG. 12 is output from the light-receiving sensor 19, the control unit 20 judges that the card K has no break. FIG. 6 and FIG. 7 show the state that a card K having no break is conveyed. After judging that the card K has no break, the control unit 20 operates the branch gate 3 to send the card K to the first stack 4. FIG. 12 shows a signal output when two cards having no break are continued.
On the other hand, when the light-receiving sensor 19 outputs a detection signal to output a light signal during a dark signal, as shown in FIG. 13, the control unit 20 judges that the card K has a break a. FIG. 10 and FIG. 11 show the state that the card K having a break is conveyed, and the break a is opened. After judging that the card K has a break, the control unit 20 operates the branch gate 3 to send the card K to the second stack 5. FIG. 13 shows a signal output when a card having a break is conveyed subsequent to a card having no break.
As shown in FIG. 5, the control unit 20 is connected with an input unit 25 through a transmission circuit, and is connected with a drive motor 24, which rotates forward and backward through a control circuit. When handling different size cards, the input unit 25 specifies the sizes of the cards. Based on the specified size information, the control unit 20 controls the operation of the drive motor 24.
For example, when a small size is specified, the control unit 20 rotates the drive motor 24 forward and rotates the shaft 17a forward. Therefore, the front-side upper roller 15a and back-side upper roller 15a' are moved in the direction of coming close to each other as shown in FIG. 14, and the distance between the flanges 15f and 15f' is narrowed.
In this time, the shaft 17b is rotated forward through the toothed pulley 22a, toothed belt 23 and toothed pulley 22b. Therefore, the front-side lower roller 16a and back-side lower roller 16a' are moved in the direction of coming close to each other, and the distance between the flanges 16f and 16f' is narrowed.
Contrarily, when a large size is specified, the control unit 20 rotates the drive motor backward and rotates the shaft 17a backward. Therefore, the front-side upper roller 15a and back-side upper roller 15a' are moved in the direction of separating from each other as shown in FIG. 15, and the distance between the flanges 15f and 15f' is widened.
In this time, the shaft 17b is rotated backward through the toothed pulley 22a, toothed belt 23 and toothed pulley 22b. Therefore, the front-side lower roller 16a and back-side lower roller 16a' are moved in the direction of separating from each other, and the distance between the flanges 16f and 16f' is widened.
The light source 18 and light-receiving sensor 19 have a light-emitting width and a light-receiving width capable of covering the amount of movement of the upper roller 15a/15a' and lower roller 16a/16a'.
As described hereinbefore, the upper roller 15a/15a' and lower roller 16a/16a' are moved in the direction of separating from each other based on the card size, and the flanges 15f/15f' and 16f/16f' can be set at the positions suitable for the card size, and a break in a card can be securely opened and detected.
When handling the same size card, the position to open a break in a card can be changed by changing the distance of the upper roller 15a/15a' and lower roller 16a/16a' from the end-face of a card.
In this case, an operator inputs a desired amount of movement from the input unit 25. Then, the control unit 20 controls the operation of the drive motor 24, and the distance of flanges 15f/15f' and 16f/16f' of the upper roller 15a/15a' and lower roller 16a/16a' from the end-face of a card can be variably controlled.
For example, FIG. 16 shows the case that the break a in a card is opened by moving the flanges 15f/15f' and 16f/16f' of the upper roller 15a/15a' and lower roller 16a/16a' from the end-face of a card to the inside by about 5 mm, and placing the flanges to the break. FIG. 17 shows the case that the break a in a card is not opened by moving the flanges 15f/15f' and 16f/16f' of the upper roller 15a/15a' and lower roller 16a/16a' from the end-face of a card to the inside by about 10 mm, and not placing the flanges to the break.
By adjusting the positions of the flanges 15f/15f' and 16f/16f' of the upper roller 15a/15a' and lower roller 16a/16a', it is possible to detect only a break longer than a predetermined length without wastefully detecting a short break.
Further, in the embodiment described above, a card is conveyed along the longish side. The conveying direction is not limited to this. A card may be conveyed along the shorter side.

(Embodiment 2)

FIG. 18 and FIG. 19 show a detection unit according to a second embodiment of the invention.
In the second embodiment, upper air nozzles 31a/31a' and lower air nozzle 32a/32a' are provided as first and second air nozzles and as third and fourth air nozzles, instead of the flanges 15f/15f' and 16f/16f' of the upper roller 15a/15a' and lower roller 16a/16a'. The upper air nozzles 31a and 31a' are moved in the direction of coming close to each other along the direction orthogonal to the card conveying direction, for example, according to the size of a card, as shown in FIG. 18. The lower air nozzles 32a and 32a' are also moved in the direction of coming close to each other, like the upper air nozzles 31a and 31a'.
The upper air nozzles 31a and 31a' are moved in the direction of separating from each other along the direction orthogonal to the card conveying direction, for example, according to the size of a card, as shown in FIG. 9. The lower air nozzles 32a and 32a' are also moved in the direction of separating from each other, like the upper air nozzles 31a and 31a'.
Air ejected from the upper air nozzle 31a/31a' and lower air nozzle 32a/32a' is blown to both sides of a card from the up/down direction, opens a break if any, and enables detection of a break.
The same effect as the first embodiment can be obtained from the second embodiment.

Claims

A paper sheet break detection unit characterized by comprising:
a conveying unit (14a - 14d) which conveys a paper sheet (K) along a conveying surface;

a first pressing unit (15f, 15f') which presses one side of the paper sheet (K) conveyed by the conveying unit (14a - 14d) in a first direction orthogonal to the conveying surface;

a second pressing unit (16f, 16f', 32a, 32a') which is provided in proximity to the first pressing unit (15f, 15f', 31a, 31a'), and presses the other side of the paper sheet conveyed by the conveying unit (14a - 14d) in a second direction reverse to the first direction;

a light-emitting unit (18) which emits light to the paper sheet deformed by the pressure of the first and second pressing units (15f, 15f', 31a, 31a', 16f, 16f', 32a, 32a');

a light-receiving unit (19) which receives the light illuminated from the light-emitting unit (18);

a judgment unit (20) which judges whether the paper sheet (K) includes a break, based on the reception of the light by the light-receiving unit (19); and

a moving mechanism (26) which moves the first pressing unit (15f, 15f', 31a, 31a') and second pressing unit (16f, 1rf', 32a, 32a') along the conveying surface in a direction orthogonal to a direction of conveying the paper sheet (K).
The paper sheet break detection unit according to claim 1, characterized in that the conveying unit has a pair of first conveying belts (14a, 14b) which holds and conveys one side of the paper sheet (K), and a pair of second conveying belts (14c, 14d) which is provided parallel to the first conveying belt (14a, 14b) with a predetermined interval, and holds and conveys the other end of the paper sheet (K);
the first pressing unit is composed of a flange (15f) of a first roller (15a) to contact the surface of one (14a) of the pair of first conveying belts (14a, 14b) and rotate following the belts, and a flange (15f') of a second roller (15a') to contact the surface of one (14c) of the pair of second conveying belts (14c, 14d) and rotate following the belts; and
the second pressing unit is composed of a flange (16f) of a third roller (16a) to contact the surface of other (14b) of the pair of first conveying belts (14a, 14b) and rotate following the belts, and a flange (16f') of a fourth roller (16a') to contact the surface of the other (14d) of the pair of second conveying belts (14c, 14d) and rotate following the belts.
The paper sheet break detection unit according to claim 2, characterized in that the moving mechanism (26) has first and second drive shafts (17a, 17b) which rotate forward and backward, and moves the flange (15f) of the first roller (15a) and the flange (15f') of the second roller (15a') in a direction of coming close to each other by the forward rotation of the first drive shaft (17a), moves the flange (16f) of the third roller (16a) and the flange (16f') of the fourth roller (16a') in a direction of coming close to each other by the forward rotation of the second drive shaft (17b), moves the flange (15f) of the first roller (15a) and the flange (15f') of the second roller (15a') in a direction of separating from each other by the backward rotation of the first drive shaft (17a), and moves the flange (16f) of the third roller (16a) and the flange (16f') of the fourth roller (16a') in a direction of separating from each other by the backward rotation of the second drive shaft (17b).
The paper sheet break detection unit according to claim 3, characterized in that the first drive shaft (17a) and second drive shaft (17b) are interlocked through an interlock mechanism (22a, 23, 22b).
The paper sheet break detection unit according to claim 2, characterized in that the amount of movement of the flanges (15f, 15f') of the first and second rollers (15a, 15a') and the flanges (16f, 16f') of the third and fourth rollers (16a, 16a') is controlled according to the size of the paper sheet or the length of a break to be detected.
The paper sheet break detection unit according to claim 1, characterized in that the first pressing unit is composed of a first air nozzle (31a) to blow air to one side of the paper sheet (K), and a second air nozzle (31a') to blow air to the other side of the paper sheet (K); and
the second pressing unit is composed of a third air nozzle (32a) to blow air to one side of the paper sheet (K) from a direction reverse to the first air nozzle (31a), and a fourth air nozzle (32a') to blow air to the other side of the paper sheet (K) from a direction reverse to the second air nozzle (31a').
The paper sheet break detection unit according to claim 6, characterized in that the first air nozzle (31a) and second air nozzle (31a') are moved in a direction of coming close to or separating from each other, and the third and fourth air nozzles are moved in a direction of coming close to or separating from each other.
The paper sheet break detection unit according to claim 6, characterized in that the amount of movement of the first and second air nozzle (31a, 31a') and third and four air nozzles (32a, 32a') is controlled according to the size of the paper sheet (K) or the length of a break to be detected.
The paper sheet break detection unit according to claim 1, characterized in that the paper sheet (K) is rectangular, and conveyed along the longish side or shorter side.