JP2006335485A - Driving transmission device and paper sheet identification device using this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving transmission device for detecting a change in drive transmitting speed caused due to changes of gear condition. <P>SOLUTION: Gears 1 to 7 are arranged in series in a prescribed direction, and teeth of the adjacent gears are engaged with each other. The gear 1 at the forefront is fixed and connected to a rotary shaft 91 directly connected to a driving source, and an encoder 21 is fixed and connected to the rotary shaft 91. The gear 7 at the end is fixed and connected to a rotary shaft 97, and an encoder 22 is fixed and connected to the rotary shaft 97. The encoders 21 and 22 are connected to a driving condition detecting part 25. Based on a signal corresponding to condition of the gear 1 input from the encoder 21 and the rotary shaft 91, and a signal corresponding to condition of the gear 7 input from the encoder 22 and the rotary shaft 97, drive transmitting condition is detected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drive transmission device that is used in a paper sheet identification device that identifies a paper sheet and is used to drive a conveyance path that requires a certain conveyance speed.

2. Description of the Related Art Conventionally, a paper sheet identification device that identifies paper sheets such as banknotes performs identification by reading magnetic data and the like provided in the paper sheets while conveying the inserted paper sheets. When reading the magnetic data of the paper sheet while conveying it, the reading accuracy of the magnetic data is greatly influenced by the accuracy of the paper sheet conveying speed.
For this reason, for example, in Patent Document 1, the rotation of the driving roller and the driven roller installed at both ends in the width direction of the conveyance path is detected by an encoder to detect slip of the conveyed paper sheet (card). An apparatus for detecting the conveyance speed is disclosed.
Japanese Patent Laid-Open No. 5-20783

  However, in the case of a structure in which a paper sheet is placed on a transport belt over a predetermined length and a sensor is installed on the transport path to read information on the paper sheet, the transport belt is driven. The gear and the conveyor belt may be worn and the conveyance speed may become unstable.

  FIGS. 13A and 13B are diagrams showing a schematic configuration of the drive transmission device. FIG. 13A shows a state before the gear is worn, and FIG. 13B shows a state where the gear is worn.

  The gears 1 to 7 are connected to the rotary shafts 91 to 97, respectively, and are arranged in series with the rotary shafts 91 to 97 in a direction perpendicular to the axial direction. The teeth of adjacent gears (gear 1 and gear 2, gear 2 and gear 3,... Gear 6 and gear 7) are engaged with each other. In addition, although not shown, the rotating shaft 91 connected to the gear 1 is connected to a driving source, and the driving is started from the gear 1 among the gears 1 to 7. In such a drive transmission device including the gears 1 to 7, when a driving force is transmitted from the drive source to the gear 1 via the rotation shaft 91, the gear 1 rotates. According to the rotation of the gear 1, the gears 2 to 6 are rotated and the gear 7 is rotated.

  At this time, as shown in FIG. 13A, the gear 7 rotates immediately after the rotation of the gear 1 if there is almost no wear of the teeth of the gears 1 to 7. When such a driving operation is repeated, the teeth of the gears 1 to 7 are worn as shown in FIG. When the teeth wear as shown in FIG. 13B, the tooth width (length along the rotation direction) of each of the gears 1 to 7 becomes narrower than the initial state, and the distance between adjacent teeth with respect to the tooth width. The interval of becomes wider. For this reason, only after the gear (first gear) rotating first rotates by a predetermined amount, the teeth of the first gear contact the teeth of the gear (terminal gear) that rotates later. As a result, a predetermined time lag occurs in transmitting rotation between adjacent gears.

  Since this phenomenon occurs between the gears 1 to 7 constituting the drive transmission device, the gear 1 must rotate a predetermined angle after the gear 1 starts rotating until the gear 7 starts rotating. (An angle A ° in FIG. 13B). For this reason, the time difference from the start of the rotation of the gear 1 to the start of the rotation of the gear 7 becomes longer than in the initial state.

  As described above, the difference in rotation start time between the first gear 1 and the last gear 7 of the drive transmission device changes from the initial state, so that the drive transmission speed gradually changes, as shown in FIG. The state shown is different from the state shown in FIG. For this reason, when reading the magnetic information with which a bill etc. are read, a conveyance speed changes and reading accuracy falls. This causes a problem that paper sheets cannot be identified.

In addition, the following problem exists as a problem of a decrease in the accuracy of the drive transmission speed due to a change in the gear state.
FIG. 14 is a diagram showing a schematic configuration of the drive transmission device in a state in which teeth are hardly worn and a gear 1 is broken.
In FIG. 14, since the gear 1 is broken, the gear 1 and the gear 2 are not engaged with each other in the tooth break generation portion 101, and the gear 1 is excessive to transmit the driving force from the gear 1 to the gear 2. Must be rotated by a predetermined angle. As a result, a time lag occurs between the rotation start time of the gear 1 and the rotation start time of the gear 7. In this case, the time lag hardly occurs in the portion where the tooth is not broken, but the time lag occurs in the portion where the tooth is broken. That is, the drive transmission speed changes every approximately one rotation. Even in such a case, there is a problem that the conveyance speed is changed, the reading accuracy is lowered, and the paper sheets cannot be identified.

  Such tooth breakage is likely to occur when the tooth becomes thin as shown in FIG. 13B, and when the tooth becomes thin and the tooth breaks, the drive transmission speed becomes more unstable, and the conveyance becomes difficult. It becomes difficult to identify paper sheets to be printed.

  Accordingly, an object of the present invention is to detect a drive transmission device that detects a change in the drive transmission speed due to a change in the state of the gear, and to detect a malfunction such as a paper sheet misidentification in advance or immediately by the change in the drive transmission speed. To provide a paper sheet identification device.

  The drive transmission device according to the present invention includes a plurality of drive force transmission members that are connected to each other and transmit a drive force from a drive source, a first drive start detection unit that detects a preset drive start timing, and a plurality of drive A second drive start detection means for detecting a drive start timing of at least one of the force transmission members excluding the drive force transmission member connected to the drive source; and a detection signal of the first drive start detection means; Drive state detecting means for detecting a timing difference from the detection signal of the second drive start detecting means.

  In this configuration, when a driving force is generated by the driving source, the driving force is sequentially transmitted to the driving force transmitting members connected to each other. At this time, the drive start timing corresponding to the substantially initial timing of the entire drive is detected by the first drive start detecting means, and the drive start of the driving force transmitting member at a predetermined position is detected by the second drive start detecting means. These timing differences are detected by the driving state detecting means. Here, when the state of the driving force transmission member changes in time series and the transmission time based on this changes, the state change of the driving force transmission member is grasped by the change in the timing difference detected by the driving state detection means. .

  In the drive transmission device of the present invention, the first drive start detection means detects the drive start timing of the drive force transmission member directly connected to the drive source. For example, the drive source is a motor, the drive force transmission member is a gear, and the first drive start detection means and the second drive start detection means are each installed on a rotating shaft connected to the leading gear and the trailing gear in the gear group. If the drive transmission state (speed) changes due to a change in gear shape (tooth shape) or the like, the difference between the rotation detection timings of the two encoders changes.

  In this configuration, the drive start timing of the drive transmission member directly connected to the drive source is used for detecting the timing difference.

  Further, the drive transmission device of the present invention is characterized in that the first drive start detecting means detects the drive start timing of the drive source.

  In this configuration, the drive start timing of the drive source is used to detect the timing difference. For example, as described above, the drive source is a motor, the drive force transmission member is a gear, the first drive start detection means is a device that detects the drive start timing of the motor (for example, a motor drive signal detection device), 2 When the drive start detection means is an encoder installed on the rotary shaft connected to the end gear in the gear group, the two encoders when the drive transmission state (speed) changes due to changes in the gear shape (tooth shape), etc. The difference in the rotation detection timing changes.

  In addition, the drive transmission device of the present invention is characterized in that the drive state detection means includes warning means for giving a warning when the timing difference exceeds a preset threshold value.

  In this configuration, by comparing the detected timing difference with a predetermined threshold, it is detected that the driving state has deteriorated beyond the limit of the stable driving state, and a warning is generated.

  Further, the paper sheet identification device of the present invention is installed on a transport path by the drive transmission device described above, a transport unit that transports the paper sheet in a predetermined direction driven by the drive transmission device, It is characterized by comprising a sensor for sensing information recorded on a paper sheet, and an identification means for identifying the paper sheet based on the sensing result of the sensor.

  In this configuration, when the timing difference of the predetermined threshold is detected by the drive transmission device as described above, it is detected that the driving state is not stable, and the conveyance and identification of the paper sheet are detected to be unstable. .

  According to this invention, it is possible to detect a change in the drive transmission speed due to a change in the state of each drive transmission member constituting the drive transmission device. As a result, for example, the drive transmission device may deteriorate in advance or immediately because the drive transmission member becomes worse than the preset state because the gear teeth become thin or the tooth breaks. Can be detected.

  Further, according to the present invention, the paper sheet identification device can detect an identification error due to the deterioration of the state of the driving force transmission member in advance or immediately.

The drive transmission device according to the first embodiment will be described with reference to the drawings.
(1) Detection of change in drive transmission speed due to normal gear wear FIG. 1 is a diagram showing a schematic configuration of the drive transmission device of this embodiment, (A) shows before the gear wears, (B) Indicates that the gear is worn. This drive transmission device is used for transmission of the driving force of the conveyance system for paper sheets such as banknotes, and is provided in a paper sheet identification device to be described later.

  As shown in FIG. 1, the drive transmission device includes gears 1 to 7 and encoders 21 and 22. The gears 1 to 7 are installed on rotating shafts (not shown), and are arranged in series in a direction perpendicular to the rotating shafts. The teeth of adjacent gears (gear 1 and gear 2, gear 2 and gear 3,... Gear 6 and gear 7) are engaged with each other. Although not shown, the gear 1 is connected to a drive source, and driving is started from the gear 1. In such a drive transmission device including the gears 1 to 7, the gear 1 rotates when the driving force is transmitted from the drive source to the gear 1. According to the rotation of the gear 1, the gears 2 to 6 are rotated and the gear 7 is rotated.

  The encoders 21 and 22 include rotation units 111 and 211 and detection units 112 and 212, respectively. The rotating portion 111 of the encoder 21 is fixedly installed on a rotating shaft 91 connected to the gear 1 and rotates together with the gear 1. Slits are formed at equal intervals in the rotating part 111, and the light emitting part and the light receiving part of the detecting part 112 are placed facing each other across the slit forming part of the rotating part 111. The detecting unit 112 detects that the rotating unit 111 rotates together with the rotating shaft 91 and the slits sequentially pass between the light emitting unit and the light receiving unit, and outputs a rotation amount detection signal corresponding to the detected number of slits. . In addition, since the rotation unit 111 starts rotating when the rotation of the rotation shaft 91 starts, the detection unit 112 signals at the timing when it first reaches the opening of the slit or reaches the wall forming the slit. This level difference occurs and is output as a drive start detection signal.

  The rotating portion 211 of the encoder 22 is fixedly installed on the rotating shaft 97 of the gear 7 and rotates together with the gear 7 and the rotating shaft 97. Slits are formed in the rotating part 211 at equal intervals in a circumferential shape, and the light emitting part and the light receiving part of the detecting part 212 are installed facing each other with the slit forming part of the rotating part 211 interposed therebetween. The detection unit 212 detects that the rotation unit 211 is rotated by the rotation of the gear 7 and the rotation shaft 97 and the slits sequentially pass between the light emitting unit and the light receiving unit, and the rotation amount according to the detected number of slits A detection signal is output. Moreover, since the rotation part 211 starts rotation when the rotation of the gear 7 starts, the detection part 212 reaches | attains the opening part of a slit first, or reaches the wall part which forms a slit. A signal level difference occurs at the timing, and this is output as a drive start detection signal.

  The drive start detection signals output from the encoder 21 and the encoder 22 are input to the drive state detection unit 25, and a time difference between the rotation start timing of the gear 1 and the rotation start timing of the gear 7 is detected.

  Here, as shown in FIG. 1A, in the state where the gears 1 to 7 are not worn, the teeth of the gears 1 to 7 are substantially engaged, so that the drive start detection signal of the encoder 21 is detected. The generation timing of the encoder 22 and the generation timing of the drive start detection signal of the encoder 22 have almost no time difference. That is, the timing difference becomes extremely small. On the other hand, as shown in FIG. 1B, when the gears 1 to 7 are worn, the teeth of the gears 1 to 7 become thinner, and the width of the teeth becomes narrower than the interval between adjacent teeth. For this reason, the leading gear rotates by a predetermined amount according to the amount of wear until the leading gear teeth come into contact with the distal gear teeth. Since such tooth wear occurs in the gears 1 to 7, the leading gear 1 has an angle corresponding to the total tooth wear amount of each of the gears 1 to 7 until the terminal gear 7 starts to rotate. Must rotate. That is, the gear 7 starts to rotate only when the leading gear 1 rotates by a predetermined angle. Therefore, the timing difference between the generation timing of the drive start detection signal detected by the encoder 21 and the generation timing of the drive start detection signal detected by the encoder 22 is equivalent to the predetermined angle (angle A ° in FIG. 1B). The driving state detection unit 25 detects this timing difference.

  The drive state detection unit 25 generates a timing difference detection signal that represents the timing difference in terms of time by subtracting the drive start detection signal from the encoder 21 from the drive start detection signal from the encoder 22. The driving state detection unit 25 stores in advance a timing difference threshold value that serves as a guideline for deterioration of the driving state, compares the time based on the timing difference detection signal with the time corresponding to the timing difference threshold value, and outputs a timing difference detection signal. If the time based on is long, a visual or audible warning is generated externally. Based on this warning, the user detects that the wear of the gear of the drive transmission device is the limit for stable conveyance, and replaces the gear.

  With such a configuration, the gears can be replaced before the operation accuracy of the drive transmission necessary for conveying the paper sheets is not maintained due to wear of the gears. As a result, the amount of change in the drive transmission speed due to gear wear can be kept within the required specification range, except for the following sharp tooth breaks.

  In addition, by setting the threshold for gear wear in this way for replacement, it is possible to prevent occurrence of tooth breakage due to tooth thinning.

(2) Detection of sudden tooth breakage FIG. 2 is a diagram showing a schematic configuration of the drive transmission device in a state where the gear 1 is suddenly broken. The drive transmission device shown in FIG. 2 has the same structure as that of the drive transmission device shown in FIG. 1A except that the gear 1 has the bent portion 101, and the operation in the portion other than the bent portion 101 is the same as that described above. Since it is the same as the description of, it is omitted.
As shown in FIG. 2, when the bent portion 101 is generated in the gear 1, the gear 1 and the gear at the bent portion 101 even if the gears 1 to 7 in the initial state are in a good engagement state. 2 does not engage. For this reason, in the tooth broken part 101, even if the gear 1 rotates, the gears 2 to 7 do not rotate. Therefore, during this time, the encoder 21 detects the rotation amount, but the encoder 22 does not detect the rotation amount. That is, the rotation detection signal output from the encoder 21 remains in the Hi state or the Low state. Here, if there is no tooth break, the Hi and Low repetition timing of the encoder 21 and the Hi and Low repetition timing of the encoder 22 are the same.

  The drive state detection unit 25 compares the rotation detection signal input from the encoder 21 with the rotation detection signal input from the encoder 22, and the rotation detection signal from the encoder 21 constantly repeats Hi and Low. On the other hand, when the rotation detection signal from the encoder 22 is temporarily locked to Hi or Low, it is detected that a tooth break has occurred in any of the gears 1 to 7, and a tooth break detection signal is generated. To do. Then, the driving state detection unit 25 generates a visual or auditory warning based on the tooth break detection signal. The user detects that the gear of the drive transmission device is broken due to this warning and cannot perform stable conveyance, and replaces the gear.

  By adopting such a configuration, even if a gear tooth break occurs suddenly, it can be detected immediately. As a result, in the paper sheet identification device to be described later, it is possible to prevent a paper sheet identification error due to a drive transmission failure caused by tooth breakage.

(3) Wear detection of the coupling portion between the gear and the rotating shaft (3-1) Wear detection of the D cut portion by the D cut coupling method FIG. 3A is a front view of the D cut coupling portion, and FIG. ) Is a side sectional view thereof. FIG. 4A is a front view of the D-cut joint before wear, and FIG. 4B is a front view of the D-cut joint after wear.
FIG. 5 is a diagram showing a schematic configuration after wear of the D-cut coupling portion in the drive transmission device using the D-cut coupling. The drive transmission device shown in FIG. 5 is obtained by D-coupling each gear and the rotation shaft, and the other configuration is the same as that of the drive transmission device shown in FIG. Is omitted.

  In the D-cut coupling, the circumferential portion of the end portion of the cylindrical rotary shaft 91 is partially cut, and the end portion of the rotary shaft is shaped like a “D” when viewed from the axial direction of the rotary shaft. A cut portion 911 is formed. On the other hand, a through hole 19 having the same shape as the D-cut portion 911 of the rotating shaft 91 is formed in the center of the gear 1. A D-cut portion 911 of the rotating shaft 91 is fitted in the through hole 19, and an end portion of the rotating shaft 91 protrudes from the surface of the gear 1. An E ring 912 that is an auxiliary member for preventing the rotary shaft 91 from coming out of the through hole 19 of the gear 1 is installed at a position where the protruding portion of the rotary shaft 91 contacts the surface of the gear 1. By setting it as such a structure, the gear 1 and the rotating shaft 91 are fixed. In this case, for example, when a driving force is applied to the rotating shaft 91, the driving force is transmitted at a portion where the flat portions of the rotating shaft 91 and the gear 1 in the D-cut portion 911 contact each other, and the gear 1 rotates. For this reason, a driving force acts on the end portion of the flat portion. Here, if the rotating shaft 91 is made of metal and the gear 1 is made of resin, the resin gear 1 having low hardness is deformed. Specifically, the flat portion is cut from the corner of the D-shaped through hole 19 and gradually approaches a circle. In such a structure, the timing shift according to the amount of wear of the D-shaped through hole 19 (corresponding to the angle C in FIG. 5) from when the rotating shaft 91 starts rotating by the drive source to when the gear 1 starts rotating. Time) occurs. For this reason, even if there is no delay in drive transmission in the gears 1 to 7, the difference in timing between the drive start detection signal of the encoder 21 and the drive start detection signal of the encoder 22 causes wear of the D-shaped through hole 19. It will be longer than before. The driving state detection unit 25 detects this timing difference, compares the time based on the detected timing difference with the time corresponding to a preset threshold value, and if the time based on the detected timing difference is long. Visually or audibly alert externally. Based on this warning, the user detects that the wear of the D-cut coupling portion of the drive transmission device is the limit for stable conveyance, and replaces the gear.

(3-2) Wear Detection of Pin Joint Part by Pin Coupling Method FIG. 6 (A) is a front view of the pin joint part, FIG. 6 (B) is a side sectional view thereof, and FIG. It is a back view. FIG. 7A is a back view of the pin coupling portion before abrasion, and FIG. 7B is a back view of the pin coupling portion after abrasion.
FIG. 8 is a diagram showing a schematic configuration after wear of the pin coupling portion in the drive transmission device using the pin coupling. The drive transmission device shown in FIG. 8 is obtained by pin-connecting each gear and a rotating shaft, and the other configurations are the same as those of the drive transmission device shown in FIGS. 1 and 5. Description of is omitted.

  In the pin coupling, a groove 199 into which a rod-like pin 913 is fitted is formed on the surface (the surface shown in FIG. 6C) in the center of the rotation shaft 91 of the gear 1, and a predetermined length from the end of the rotation shaft 91. A through hole 914 into which a rod-like pin 913 is inserted is formed at the center side position. A pin 913 is inserted into the through hole 914 of the rotating shaft 91 and a pin 913 is fitted into the groove 199 of the gear 1. Further, the end of the rotating shaft 91 protrudes from the surface of the gear 1, and the rotating shaft 91 is prevented from coming out of the through hole 19 of the gear 1 at a position where the protruding portion of the rotating shaft 91 contacts the surface of the gear 1. An E-ring 912 is installed as an auxiliary member. By setting it as such a structure, the gear 1 and the rotating shaft 91 are fixed. In this case, for example, when a driving force is applied to the rotating shaft 91, the driving force is transmitted at the contact portion between the pin 913, the rotating shaft 91, and the gear 1 in the pin coupling portion, and the gear 1 rotates. Here, if the rotating shaft 91 and the pin 913 are made of metal and the gear 1 is made of resin, the resin gear 1 having low hardness is deformed. Specifically, the groove 199 is scraped by the rotation of the pin 913 and gradually deforms into a fan shape. In such a structure, the timing shift according to the wear amount of the groove 199 of the pin coupling portion (corresponding to the angle D in FIG. 8) from when the rotation shaft 91 starts rotating by the drive source to when the gear 1 starts rotating. Time) occurs. For this reason, even if there is no delay in drive transmission in the gears 1 to 7, the timing difference between the drive start detection signal of the encoder 21 and the drive start detection signal of the encoder 22 is longer than before the wear of the groove 199 occurs. Become. The driving state detection unit 25 detects this timing difference, compares the time based on the detected timing difference with the time corresponding to a preset threshold, and increases the time based on the detected timing difference detection signal. For example, a visual or audible warning is generated externally. Based on this warning, the user detects that the wear of the groove of the pin coupling portion of the drive transmission device is the limit for stable conveyance, and replaces the gear.

  As described above, by using the configuration of the present embodiment, it is possible to detect the wear of the connection portion between the gear of the drive transmission device and the rotating shaft.

  In the above-described embodiment, the example in which the encoder is installed on each of the rotary shaft directly connected to the drive source and the rotary shaft connected to the gear at the end of the gear train is shown. You may install an encoder in the rotating shaft connected to the gear in the middle of the gear train which becomes.

  FIG. 9 is a diagram showing a schematic configuration of a drive transmission device in which an encoder is installed on a rotary shaft connected to a gear in the middle of a gear train. FIG. 9 shows a state where the encoder 23 is installed on the rotary shaft 96 connected to the gear 6 immediately before the end gear 7.

  Even with such a configuration, as described above, gear teeth wear and tooth breakage can be detected with respect to the gears 1 to 6, and the rotating shaft directly connected to the drive source and It is possible to detect the wear of the coupling portion with the gear to be connected. In this case, tooth wear and tooth breakage of the gear 7 cannot be detected.

  In the above-described embodiment, the example in which the encoder 11 is installed on the rotary shaft directly connected to the drive source has been described. However, the drive control signal of the motor that is the drive source may be detected as the drive start timing.

  FIG. 10 is a diagram illustrating a configuration of a drive transmission device when a drive control signal of a drive source is used.

  The drive transmission device shown in FIG. 10 omits the encoder 21 from the drive transmission device shown in FIG. 1 and uses a drive control signal of the motor 100 directly connected to the gear 1 and the rotary shaft 91 for timing detection. In this drive transmission device, a drive control signal is input from the drive control unit 24 to the motor 100, and a drive control signal is also input to the drive state detection unit 25.

  Even with such a configuration, the timing corresponding to the drive start timing of the rotary shaft or gear directly connected to the drive source can be obtained, so that the gear teeth wear and tooth breakage are detected as described above. It is possible to detect the wear of the joint between the rotating shaft directly connected to the drive source and the gear connected thereto. With such a configuration, the encoder installed on the rotary shaft directly connected to the drive source can be omitted, so that a drive transmission device with a simpler configuration can be realized while achieving the above-described effects. be able to.

  In the above-described embodiment, an example in which only a gear is used as the driving force transmission member has been described. However, a configuration using not only a gear but also a belt or the like may be used.

FIG. 11 is a diagram illustrating a configuration of a drive transmission device using a gear and a belt.
In FIG. 11, the gears 3, 4, and 5 in FIG. 1 are omitted, pulleys 82 and 86 are installed in the gear 2 and the gear 6, and the pulleys 82 and 86 are connected by a belt 80. In this configuration, when the gear 2 rotates, the pulley 82 rotates and the belt 80 rotates. When the belt 80 rotates, the pulley 86 rotates and the gear 6 rotates. A driving force is transmitted by such an operation.

  Even with this configuration, the encoders 11 and 21 can detect the drive start timing of the rotary shaft directly connected to the drive source and the drive start timing of the rotary shaft connected to the terminal gear. Thus, as described above, the wear and breakage of the gear teeth can be detected, and the wear of the coupling portion between the rotary shaft directly connected to the drive source and the gear connected thereto can be detected. Further, slip due to belt wear can be detected.

  Next, a paper sheet identification device using each drive transmission device shown in the first embodiment will be described as a second embodiment with reference to the drawings.

  FIG. 12 is a diagram showing a schematic configuration of the paper sheet identification apparatus of the present embodiment.

  The paper sheet identification device includes gears 1 to 13, encoders 21 and 22, lower transport rollers 31 to 36, upper transport rollers 41 to 46, springs 51 to 56, sensors 61 and 62, driving state detection unit 25, and paper sheets. An identification unit 26 is provided.

  The gears 1 to 11 are sequentially arranged in a direction parallel to the paper sheet conveyance direction, and the adjacent gear gear 1 and the gears 2,. . . The teeth of the gear 10 and the gear 11) are engaged. A gear 12 is installed at a predetermined position on the side of the gear 1 facing the paper sheet transport path, and the teeth of the gear 1 and the gear 12 are also engaged. And the rotating shaft connected to this gear 12 is connected to the motor 100 which is a drive source. A gear 13 is installed at a predetermined position on the side of the gear 11 facing the paper sheet transport path, and the teeth of the gear 11 and the gear 13 are also engaged.

  The lower conveyance rollers 31, 32, 33, 34, 35, and 36 are installed in the gear 1, the gear 3, the gear 5, the gear 7, the gear 9, and the gear 11, respectively. Also rotate. The end positions of these lower transport rollers 31 to 36 in the direction of the paper sheet transport path are all the same, and a line connecting these points corresponds to the paper sheet transport path. Upper conveyance rollers 41 to 46 are installed at symmetrical positions with the sheet conveyance path of the lower conveyance rollers 31 to 36 as symmetry planes, and are urged by springs 51 to 56, respectively, to lower conveyance rollers 31 to 36. Touching. With this structure, when paper sheets such as banknotes are carried into the paper sheet transport path (between the upper transport rollers 41 to 46 and the lower transport rollers 31 to 36), the gears 1 to 13 are rotated by the motor 100, The driving force is transmitted, and the lower conveyance rollers 31 to 36 rotate in the same direction. Here, since the upper conveyance rollers 41 to 46 are in contact with the lower conveyance rollers 31 to 36 by a predetermined urging force, the upper conveyance rollers 41 to 46 and the lower conveyance rollers disposed at positions facing each other. 31 to 36 sandwich the paper sheet, and the paper sheet is subjected to a conveying force due to the rotation of the lower conveying rollers 31 to 36. If the paper sheet is in a predetermined conveying direction, for example, FIG. It is conveyed in the direction from the roller 36 side toward the lower conveyance roller 31 side.

  Each of the sensors 61 and 62 is composed of a magnetic sensor or an optical sensor, and detects unique information such as magnetic information and light transmittance provided in the paper sheets passing through the installation positions of the sensors 61 and 62. And output to the paper sheet identification unit 26. The paper sheet identification unit 26 analyzes the input information and identifies the type of the paper sheet.

  Incidentally, an encoder 21 is fixedly installed on the rotary shaft connected to the gear 12, and an encoder 22 is fixedly installed on the rotary shaft connected to the gear 13. The encoders 21 and 22 are electrically connected to the drive state detection unit 25, and signals detected by the encoders 21 and 22 are input to the drive state detection unit 25. As described above, when the motor 100 is driven and the rotation shaft connected to the gear 12 and the rotation shaft connected to the gear 13 are rotated, signals indicating the drive start and the rotation amount are generated, and the drive state detection unit 25. Output to.

  The drive state detection unit 25 is based on signals input from the encoders 21 and 22, and the rotation start timing (drive start timing) of the rotary shaft connected to the gear 1 at the tip of the drive transmission device configured by the gears 1 to 13; A timing difference from the rotation start timing (drive start timing) of the rotary shaft connected to the terminal gear 13 is detected. Then, the time corresponding to the detected timing difference is compared with a preset threshold time, and if the time corresponding to the detected timing difference is long, a warning is issued to the outside. Here, the threshold time is set to a time corresponding to a timing difference at which the conveyance speed is less than or equal to an allowable accuracy depending on the driving state of the drive transmission device.

  By performing such processing of the drive state detection unit 25 every time the paper sheet identification device is started up, it occurs during the operation of the paper sheet identification device unless a sudden failure such as a sudden gear tooth breakage occurs. Identification mistakes due to a decrease in accuracy of the conveyance speed can be prevented in advance. In addition, by operating the drive state detection unit 25 during the operation of the paper sheet identification device, it is possible to immediately detect that the conveyance speed changes due to a sudden failure due to tooth breakage or the like, and to perform identification. The processing can be stopped to prevent identification mistakes.

The figure which shows schematic structure of the drive transmission apparatus of 1st Embodiment. The figure which shows schematic structure of the drive transmission device in the state in which the gear 1 sharply broke down Front view of D-cut joint and side sectional view Front view of D-cut joint before wear and front view of D-cut joint after wear The figure which shows schematic structure after abrasion of the D cut coupling part in the drive transmission device using D cut coupling Front view of the pin coupling part, side sectional view thereof, and rear view thereof Back view of pin joint before wear and back view of pin joint after wear The figure which shows schematic structure after abrasion of the pin coupling part in the drive transmission device using pin coupling The figure which shows schematic structure of the drive transmission device which installed the encoder in the rotating shaft connected to the gear in the middle of a gear train The figure which shows the structure of the drive transmission device at the time of using the drive control signal of a drive source The figure which shows the structure of the drive transmission device using a gear and a belt The figure which shows schematic structure of the paper sheet identification device of 2nd Embodiment. The figure which shows schematic structure of a drive transmission device The figure which shows the schematic structure of the drive transmission device in the state where tooth wear hardly occurred and the gear 1 was broken.

Explanation of symbols

1 to 13-Gear 21, 22, 23-Encoder 111, 211-Rotating unit 112, 212-Detecting unit 24-Drive control unit 25-Drive state detecting unit 26-Paper sheet identifying unit 31-36-Lower conveying roller 41 -46-Upper conveying roller 51-56-Spring 61,62-Sensor 80-Belt 82,86-Pulley 91-97-Rotating shaft 100-Motor

Claims (5)

A plurality of driving force transmission members connected to each other and transmitting a driving force from a driving source;
First drive start detecting means for detecting a preset drive start timing;
Second drive start detection means for detecting a drive start timing of at least one drive force transmission member excluding the drive force transmission member connected to the drive source among the plurality of drive force transmission members;
Drive state detection means for detecting a timing difference between the detection signal of the first drive start detection means and the detection signal of the second drive start detection means;
A drive transmission device comprising:   The drive transmission device according to claim 1, wherein the first drive start detection means detects a drive start timing of a driving force transmission member directly connected to the drive source.   The drive transmission device according to claim 1, wherein the first drive start detection unit detects a drive start timing of the drive source.   The drive transmission device according to any one of claims 1 to 3, wherein the drive state detection unit includes a warning unit that issues a warning when the timing difference is equal to or greater than a preset threshold value. A drive transmission device according to claims 1 to 4,
Conveying means for conveying paper sheets in a predetermined direction driven by the drive transmission device;
A sensor installed on a transport path by a transport means for sensing information recorded on the paper sheet;
An identification means for identifying a paper sheet based on a sensing result of the sensor;
A paper sheet identification apparatus comprising:

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