JP4636310B2 - Bundling device and tension adjusting method for bundling tape - Google Patents

Description

  The present invention relates to a bundling apparatus and a bundling tape tension adjusting method in which a bundling tape of a predetermined length drawn from a reel is wound around a bundling object, and in particular, the reel is driven to rotate in the tape winding direction to be a bundling tape. The present invention relates to a bundling device to which tension is applied and a method for adjusting the tension of a bundling tape.

  2. Description of the Related Art Conventionally, a bundling device is known in which a reel is rotated in the tape winding direction to apply tension to a bundling tape drawn from the reel. Among such bundling devices, there is one in which a reel is driven to rotate by an electric motor. In such a bundling device, a bundling tape having a length of, for example, 1000 m is wound around a reel, so that the outer diameter dimension of the bundling tape wound around the reel (hereinafter simply referred to as the outer diameter dimension of the bundling tape). However, it differs between the initial stage of drawing out the binding tape (when the outer diameter of the binding tape is relatively large) and the final stage of drawing out (when the outer diameter of the binding tape is relatively small). For this reason, in such a binding device, when the shaft torque of the electric motor is constant, the tension of the binding tape wound around the object to be bound according to the outer diameter dimension of the binding tape (the remaining amount of the binding tape), That is, the tightening force of the object to be bound by the binding tape varies greatly.

  Therefore, in the above bundling device, there has been a problem that the binding force of the object to be bound is insufficient at the initial stage of pulling out the binding tape, and that the tension of the binding tape becomes excessive at the final stage of pulling out the binding tape. For example, when the object to be bound is vegetable, the variation in tightening force leads to the variation in quality (commercial value). Therefore, a constant tightening is possible regardless of the outer diameter of the binding tape (remaining amount of binding tape). There has been a demand for a bundling device that can provide an applied force. Therefore, Patent Document 1 discloses a bundling device in which a reel shaft is rotationally driven via an electromagnetic powder clutch. In this binding device, the winding force of the binding tape, that is, the tightening force of the object to be bound is adjusted by adjusting the transmission torque of the electromagnetic powder clutch. However, in a binding device having such an electromagnetic powder clutch, an operator periodically checks the outer diameter size of the binding tape (the remaining amount of the binding tape) and electromagnetically responds to the outer diameter size of the binding tape. It is necessary to adjust the volume of the powder clutch.

Therefore, in Patent Document 2, a braking force is applied to the tape pad by an electromagnetic brake, and further, based on the filament length pulse data and the filament outer diameter data in advance. Data table for strip length and outer diameter is stored in the comparison calculator, and calculation is performed with the corresponding data, and the voltage applied to the electromagnetic brake is reduced step by step to control the tape tension constantly. A tape tension adjusting device is disclosed. In this tape tension adjustment device, the tape tension is controlled based on the data obtained by measuring the correlation between the striatum measuring pulse and the outer diameter and the braking force in advance, so that adjustment very close to manual continuous adjustment is automatically performed. Therefore, unlike the bundling device of Patent Document 1, it is not necessary to regularly check the outer diameter dimension of the bundling tape (the remaining amount of the bundling tape). However, in this tape tension adjusting device, the tape pad brake force is adjusted based on the selected data in the data table to adjust the tape tension, so that data is set in the data table in advance for each filament. It takes time and effort to create a data table.
JP 2003-191911 (paragraph numbers 0019 to 0030, FIG. 1) Japanese Patent Laid-Open No. 9-40290 (paragraph numbers 0011 and 0012, FIG. 2)

Therefore, the present invention has been made in view of the above circumstances, and a first object is to make the tension of the binding tape drawn from the reel substantially constant regardless of the outer diameter of the binding tape wound around the reel. It is to provide a binding device that is maintained.
A second object is to provide a method for adjusting the tension of the binding tape in which the tension of the binding tape drawn from the reel is maintained substantially constant regardless of the outer diameter of the binding tape wound around the reel. It is in.

In order to achieve the first object, the invention according to claim 1 of the present invention is a bundling device in which a bundling tape of a predetermined length drawn from a reel is wound around a bundling object, The reel is rotated by rotating the reel in the tape winding direction, and a servo motor that applies tension to the binding tape, and is formed in a disk shape and is provided with a plurality of slits at the periphery so that the reel is rotated. A sensor dog that rotates around a center line along with the sensor dog, and detects a number of the slits corresponding to the rotational displacement of the sensor dog, and outputs a pulse signal having a pulse number corresponding to the number of the detected slits When the rotational torque of the reel, the micro control unit to be set in any stage of the plurality stages from the photosensor in accordance with the number of pulses of the pulse signal output, the including And wherein the door.

In order to achieve the second object described above, the invention according to claim 2 of the present invention includes a servo motor that applies tension to the binding tape by rotationally driving the reel in the tape winding direction, and a disc-like shape. A plurality of slits are equally arranged around the periphery, and a sensor dog that rotates around the center line as the reel rotates, and a number of slits corresponding to the rotational displacement of the sensor dog are detected. And a micro photo sensor that outputs a pulse signal having a pulse number corresponding to the number of the detected slits, and binding a binding tape of a predetermined length drawn from the reel around the binding object a binding tape tensioning method used in the apparatus, the rotational torque of the reel, Uchiizu a plurality of steps in accordance with the number of pulses of the pulse signal outputted from the micro photo sensor And setting the Kano stage.

Therefore, in the first and second aspects of the invention, the micro photosensor detects the number of slits corresponding to the rotational displacement of the sensor dog that rotates with the rotation of the reel when the binding tape is pulled out from the reel. Then, a pulse signal having the number of pulses corresponding to the number of detected slits is output. Then, the control device sets the shaft torque of the servo motor, that is, the rotational torque of the reel, in any one of a plurality of stages according to the output signal (pulse signal) of the micro photo sensor.

  It is possible to provide a bundling device and a bundling tape tension adjusting method in which the tension of the bundling tape drawn out from the reel is maintained substantially constant regardless of the outer diameter of the bundling tape wound around the reel.

  An embodiment of the present invention will be described with reference to FIGS. In the binding device 1, a binding tape 3 having a predetermined length (fixed length) drawn from a reel 2 is stretched between the reel 2 and a binding head lower portion 5, and the reel 2 and the binding head lower portion 5 are stretched. The binding tape 3 stretched between the two is wound around the object 6 to be bound. The bundling apparatus 1 includes a reel driving unit that rotates the reel 2 in the tape winding direction to apply tension to the bundling tape 3 wound around the object 6 and a bundling tape 3 having a predetermined length. Rotational displacement detecting means for detecting the rotational displacement of the reel 2 when it is pulled out from the motor 2 and torque adjustment for adjusting the rotational torque of the reel 2 driven to rotate by the reel driving means according to the detection result of the rotational displacement detecting means And the binding tape 3 wound around the object to be bound 6 by adjusting the rotational torque of the reel 2 in a stepwise manner (eight steps in the present embodiment) by the torque adjusting means. The tension is maintained substantially constant.

  Further, as shown in FIG. 1, the binding device 1 sequentially transfers a plurality of buckets 7 to which the objects to be bound 6 are sequentially supplied by the input device in the direction to transport the objects to be bound (the left direction in the drawing in FIG. 1). A bucket conveyor 8 is provided for conveying and circulating these buckets 7 on a predetermined track. As shown in FIGS. 2 and 3, the bucket conveyor 8 includes two sets of sprocket pairs on a support-side shaft 11 that extends in the apparatus width direction (vertical direction in the drawing in FIG. 3) and is fixed to the frame 10 at both ends. 12 and 13 are provided. The frame 10 is provided with a drive-side shaft 14 that is disposed at a predetermined axial distance with respect to the support-side shaft 11 in the direction in which the object to be bundled is conveyed, and whose both ends are rotatably attached to the frame 10. The two sets of sprockets 15 and 16 are fixed to the drive side shaft 14. In the bucket conveyor 8, each bucket transport chain 17 (endless chain) is wound around each sprocket disposed on the same plane (vertical surface) of the sprocket pair 12, 13 and the sprocket pair 15, 16. Each bucket transport chain 17 is provided with a plurality of buckets 7 on which the objects 6 to be bound are loaded at a predetermined interval.

  As shown in FIG. 1, the bucket conveyor 8 has a structure in which each bucket 7 is circulated by driving the drive side shaft 14 by a bucket drive motor 47. Further, the bucket conveyor 8 is provided such that a portion of each bucket transport chain 17 running on the upper side (upper side in the drawing in FIG. 2) is guided substantially horizontally by each rail 18 and is provided in each bucket transport chain 17. Each of the buckets 7 is turned in a predetermined track at the end of each rail 18. As shown in FIG. 4, each bucket 7 is formed by being divided into two in the apparatus width direction (the direction of the paper in FIG. 4) and is formed into a rectangular shape (a retort in this embodiment). The four sides of the three food packs are supported, and the support wall 19 on the front side (left side as viewed in FIG. 4) is tilted forward as necessary. Each support wall 19 of each bucket 7 is held in a standing state by the spring force of each tension coil spring 20.

  The bundling apparatus 1 includes a bundling mechanism that includes a bundling head upper portion 4 and a bundling head lower portion 5. Since the present binding apparatus 1 is equipped with an existing binding mechanism, only the schematic structure of the binding mechanism will be described here, and a detailed description of the binding heads 4 and 5 will be omitted. As shown in FIGS. 5 and 6, the bundling mechanism has the bundling head lower portion 5 aligned with the end of the bucket conveyor 8 and provided at the approximate center in the width direction of the frame 10. As shown in FIGS. 5 and 7, in the bundling mechanism, the bundling head upper portion 4 is provided at the other end of the arm 21 whose one end is rotatably attached to the frame 10. In the binding mechanism, the arm 21 is rotated around the support shaft in the clockwise direction as viewed in FIG. 5 by driving the air cylinder 22 provided on the frame 10. As a result, the binding head upper portion 4 and the binding head lower portion 5 are brought into contact with each other, and the tail portion of the binding tape 3 wound around the object to be bound 6 is bonded and cut, and the cut binding tape 3 is cut. The end is held by the binding head lower part 5.

  Further, as shown in FIGS. 5 and 8, the binding device 1 includes a tape pulling mechanism 23 that pulls out the binding tape 3 stretched between the reel 2 and the binding head lower portion 5 by a predetermined length. . The tape pull-out mechanism 23 includes a roller pair 25 that can be reciprocated in a horizontal direction (left and right directions as viewed in FIG. 5 and FIG. 8) by a linear guide 24, and a reel is disposed between the rollers of the roller pair 25. 2 is passed through roller pairs 27, 28, and 29. The tape pull-out mechanism 23 is configured so that the roller pair 25 is driven by the air cylinder 26 in the direction in which the roller pair 25 is driven in the state where the end of the binding tape 3 pulled out from the reel 2 is held by the binding head lower portion 5 ( The binding tape 3 having a predetermined length is pulled out from the reel 2 by being moved to the left in FIG. 5 and FIG. In the binding device 1, the roller pair 25 is positioned between the roller pair 25 and the binding head lower portion 5 in a state where the roller pair 25 is positioned at the forward end position (position immediately after the binding tape 3 is pulled out from the reel 2). The provided binding tape 3 is configured to be wound around an object to be bound 6 accommodated in a bucket 7 that revolves around the end of the bucket conveyor 8.

  As shown in FIGS. 5 and 9, the binding device 1 includes a binding object pressing mechanism 30 that presses and supports the binding object 6 accommodated in the bucket 7 turning around the end of the bucket conveyor 8. Prepare. The bound object pressing mechanism 30 includes round belts 34 (endless belts) wound around three guide rollers 31, 32, 33 rotatably disposed on the frame 10 on both sides of the binding head upper part 4 in the apparatus width direction. They are arranged at predetermined intervals (on both sides in the paper viewing direction in FIGS. 5 and 9). In the binding device 1, the binding object 6 accommodated in the bucket 7 is pressed by the round belt 34 stretched between the guide roller 32 and the guide roller 33 of the binding object pressing mechanism 30. By being supported, the posture of the bundled object 6 that is turning around the end of the bucket conveyor 8 is maintained. As shown in FIGS. 7 and 9, the bound object pressing mechanism 30 includes each arm having one end pivotably provided on the support shaft of the arm 21 and a guide roller 31 attached to the other end. 35 is urged counterclockwise around the support shaft by the tension coil springs 36 as viewed in FIG. 7 and FIG. 9 to apply tension to each round belt 34.

  Further, as shown in FIG. 6, in the binding device 1, a pusher 46 that is advanced and retracted by driving the air cylinder 48 is provided below the binding head lower portion 5, and the pusher 46 is advanced at a predetermined timing. Thus, the object to be bound 6, which has been bound by the binding tape 3, is transported from the bucket 7 toward the discharge conveyor 9. As shown in FIGS. 10 and 11, in the binding device 1, the reel 2 is fixed to a flange portion of a shaft member 38 that is rotatably supported by a bearing pair 37 installed in the frame 10. Further, the bundling device 1 is provided with a servo motor 40 (reel driving means) provided on the frame 10 via a motor mounting bracket 39, and the spur gear 42 fixed to the spindle 41 of the servo motor 40 includes the shaft member. 28 is meshed with a spur gear 43 fixed to the other side. Further, a sensor dog 44 (rotational displacement detecting means) formed in a disk shape is provided concentrically on the other end surface of the shaft member 38, and a plurality of (15 in the present embodiment) are provided on the periphery of the sensor dog 44. .) Slits (small holes, etc.).

  The motor mounting bracket 39 has a micro photo sensor 45 (rotational displacement detecting means) for detecting a slit positioned at a predetermined angle phase around the center line of the sensor dog 44 (hereinafter simply referred to as a predetermined angle phase). Provided. In the binding device 1, the rotational displacement of the reel 2 when the binding tape 3 is pulled out from the reel 2 by the tape pull-out mechanism 23 is detected by the number of slits of the sensor dog 44 detected by the microphotosensor 45. It has become a structure. Further, in the binding device 1, the shaft torque of the servo motor 40 is controlled based on the control of a control device (torque adjusting means) constituted by a microcomputer. The bundling device 1 has a structure in which the rotational torque of the reel 2 is adjusted by adjusting the shaft torque of the servo motor 40 based on the control of the control device.

  In the control device, the data table shown in FIG. 12 is stored in the storage unit of the control device. The data table shows the number of pulses (4 or less, 5, 6, 7) of the detection signal (pulse signal) output from the microphotosensor 45 when a binding force of about 0.1 N is applied to the object 6 to be bundled. , 8, 9, 10, 11 or more), the rotational torque of the reel 2 is made to correspond to 8 stages. And in the said control apparatus, the axial torque of the servomotor 40 is set to 8 steps according to the pulse number of the detection signal (pulse signal) output from the said micro photo sensor 45, The rotational torque of the reel 2, In other words, the tension of the binding tape 3 wound around the object to be bound 6 is adjusted in eight stages. The output signal (servo motor control signal) of the control device is input to the servo motor 40 via a sequencer and an analog output unit.

  Next, the operation of the binding device 1 will be described. In addition, in this Embodiment, the to-be-bundled thing 6 is the retort food (to-be-bundled thing) of the 3 pack which was supplied so that bundling could be carried out sequentially by the injection | throwing-in apparatus. FIG. 5 and FIG. 13 show a state immediately before the binding tape 3 is pulled out from the reel 2 by the tape pull-out mechanism 23. In this state, as shown in FIG. 14, the binding tape 3 having a predetermined length (230 mm in the present embodiment) is pulled out from the reel 2 by the tape pull-out mechanism 23. As a result, the binding tape 3 having a predetermined length is pulled out from the reel 2, and the reel 2 is wound around the center line of the shaft member 38 and the outer diameter dimension of the binding tape 3 wound around the reel 2 (hereinafter simply referred to as “rear tape”). The tape is rotated in the tape drawing direction (counterclockwise in FIG. 5) by an angle phase corresponding to the outer diameter of the binding tape 3. As the reel 2 is rotated, the sensor dog 44 (rotational displacement detecting means) is rotated, and the number of slits corresponding to the rotational displacement of the sensor dog 44 is detected by the micro photosensor 45 (rotational displacement detecting means). Is done.

  The micro photo sensor 45 outputs a pulse signal having the number of pulses corresponding to the number of detected slits, and the pulse signal is input to a control device (torque adjusting means). In the control device, based on the data table shown in FIG. 12, the rotational torque of the reel 2 is set in any one of eight stages according to the number of pulses of the input pulse signal. The shaft torque of the servo motor 40 (torque adjusting means) is set according to the rotational torque of the reel 2. As shown in FIG. 12, in this embodiment, the binding tape 3 wound around the reel 2 has a maximum radius dimension of 152.5 mm, a minimum radius dimension of 45 mm, and a pulse number of 4 or less. In this case, when the rotational torque of the reel 2 is 1.49 Nm, the number of pulses is 5, the rotational torque of the reel 2 is 1.34 Nm, and when the number of pulses is 6, the shaft torque of the servo motor 40 is 1.19 Nm and the number of pulses is 7 When the number of pulses is 8, the rotational torque of the reel 2 is 0.89 Nm, when the number of pulses is 9, the rotational torque of the reel 2 is 0.75 Nm, and the number of pulses is The rotational torque of the reel 2 when the number is 10 is set to 0.59 Nm, and the rotational torque of the reel 2 when the number of pulses is 11 or more is set to 0.44 Nm.

  Next, as shown in FIG. 14, the object to be bound is moved (retracted) in the opposite direction (right direction in the drawing in FIG. 14) with respect to the direction of the object to be bound to transport the roller pair 25 of the tape drawing mechanism 23. 2 is swung at the end of the bucket conveyor 8 (the left end in FIG. 14). Then, as shown in FIG. 15, the bucket 7 a that accommodates the object to be bundled 6 in which the roller pair 25 is positioned at the retracted end position and the binding tape 3 is wound halfway is placed in the binding position (the bucket in FIG. 15). As shown in FIG. 16, the binding mechanism arm 21 (see FIG. 7) is rotated to bring the binding head upper portion 4 and the binding head lower portion 5 into the bound object 6 as shown in FIG. Collide with the bottom of the. As a result, the binding tape 3 wound around the object to be bundled 6 is joined and cut on the bottom surface of the object to be bundled 6 and cut, and the end of the binding tape 3 continuous to the reel 2 is connected to the lower part 5 of the binding head. Retained.

  Next, as shown in FIG. 17, the binding head upper portion 4 is raised by rotating the binding mechanism arm 21 (see FIG. 7), and the binding head upper portion 4 is moved to the standby position (upper binding head portion in FIG. 17). 4). Then, after the binding head upper portion 4 is positioned at the standby position, the tape pulling mechanism 23 pulls out the binding tape 3 having a predetermined length from the reel 2, and each bucket 7 is then bound by 1 pitch (in FIG. 16, the next binding is performed). It is sent in the forward direction only by the distance (the distance at which the bucket 7b waiting for accommodating the object to be bound 6 reaches the binding position). As described above, the reel torque is also set in this step by setting the shaft torque of the servo motor 40 in eight stages according to the number of slits of the sensor dog 44 detected by the micro photo sensor 45 when the binding tape 3 is pulled out. The rotational torque of 2, that is, the tension of the binding tape 3 wound around the object 6 is adjusted in eight stages. In addition, the object to be bound 6 that has been bound in the bucket 7a is discharged by the pusher 46 (see FIG. 6) and is carried out of the apparatus by the discharge conveyor 9.

This embodiment has the following effects.
In the binding apparatus 1, the binding tape 3 having a predetermined length is rotationally driven in the tape winding direction by a servo motor 40 (reel driving means) according to the rotational displacement of the reel 2 when the binding tape 3 is pulled out from the reel 2. The rotational torque of the reel 2 is adjusted. Further, in the binding device 1, the rotational displacement of the reel 2 (outer diameter dimension of the binding tape 3) is divided into eight stages, and according to the rotational displacement stage (outer diameter dimension of the binding tape 3). The shaft torque of the servo motor 40 is adjusted in 8 steps, and the rotational torque of the reel 2 is adjusted in 8 steps.
Therefore, in the binding device 1, the rotational torque of the reel 2 is appropriately adjusted according to the outer diameter size (remaining amount) of the binding tape 3, so that the object 6 to be bound is irrespective of the outer diameter size of the binding tape 3. Since the tension of the binding tape 3 wound around is kept substantially constant and the tightening force of the binding object 6 is properly maintained, the quality (commercial value) of the binding object 6 is ensured.

In the binding device 1, the slit of the sensor dog 44 (rotational displacement detecting means) that is driven to rotate with respect to the reel 2 is detected by the microphotosensor 45 (rotational displacement detecting means), and is detected by the microphotosensor 45. A pulse signal is output from the microphotosensor 45 according to the number of slits. Then, the control device (torque adjusting means) adjusts the shaft torque of the servo motor 40 (torque adjusting means) in eight stages according to the number of pulses of the pulse signal based on the data table stored in the storage unit.
Therefore, the binding device 1 has extremely high accuracy (accuracy of detecting rotational displacement, accuracy of adjusting the rotational torque of the reel 2), so that the reliability of the device is high and the quality of the object 6 to be bound is ensured. Further, by changing the resolution (number of slits) of the sensor dog 44 and preparing a data table corresponding to the sensor dog 44, the sensor dog 44 can be used for a wide variety of objects 6 to be bound. Furthermore, in the binding device 1, since the rotational torque control of the reel 2 is simply performed, the reliability of the device is high.

  Further, in this binding apparatus 1, the object 6 to be bound is bound by the binding tape 3 on the bottom surface of the object 6 to be bound (the bottom surface of the bucket 7), so both sides of the binding tape 3 wound around the object to be bound 6. Is pulled toward the bottom surface of the object 6 to be bound, so that the object 6 is securely tightened. Thereby, for example, even when water droplets adhere to the surface of the object to be bundled 6 and the binding tape 3 is difficult to stick, the object to be bundled 6 is reliably bound. Further, since the object to be bound 6 is bound on the bottom surface (back surface) of the object to be bound 6, the object to be bound 6 is bound without the end portion of the bag being sandwiched between the binding tapes 3.

In addition, embodiment is not limited above, For example, you may comprise as follows.
In the present embodiment, when the shaft torque of the servo motor 40 is adjusted to 8 levels (the outer diameter of the binding tape 3 is divided into 8 levels) and the binding tape 3 wound around the object 6 is wound up. The rotational torque of the reel 2, that is, the tightening force of the object to be bundled 6 is adjusted in eight stages. For example, when the tightening force of the object to be bundled 6 is to be adjusted more finely, The data table corresponding to the sensor dog 44 may be prepared.
The rotational displacement detection means does not need to be configured by the sensor dog 44 and the micro photo sensor 45, and may be configured by using, for example, a rotary encoder.

It is a front view of this binding apparatus. It is explanatory drawing of this binding apparatus, and is a front view of a bucket conveyor. It is explanatory drawing of this binding apparatus, and is a top view of a bucket conveyor. It is explanatory drawing of this binding apparatus, and is a front view of a bucket. It is explanatory drawing of this binding apparatus, and is a figure which shows a binding mechanism periphery. It is explanatory drawing of this binding apparatus, and is a figure which shows the terminal periphery vicinity of a bucket conveyor. It is explanatory drawing of this binding apparatus, and is a figure which shows a binding head upper periphery. It is explanatory drawing of this binding apparatus, and is a figure which shows a tape drawer mechanism. It is explanatory drawing of this binding apparatus, and is a figure which shows a to-be-bound object holding | suppressing mechanism. It is explanatory drawing of this binding apparatus, and is a figure which shows a reel periphery. It is explanatory drawing of this binding apparatus, and is a figure which shows the structure of a reel drive means and a rotation displacement detection means. It is explanatory drawing of this binding apparatus, and is a schematic diagram of the data table stored in the memory | storage part of a control apparatus. It is explanatory drawing of this binding apparatus, and is a figure which shows the state which the bucket in which the to-be-bound object bound first was accommodated waited in the standby position. It is a figure which shows the state from which the binding tape was pulled out from the reel from the state shown by FIG. It is a figure which shows the state from which the bucket in which the to-be-bundled object to be bound first was accommodated was positioned in the binding position from the state shown by FIG. It is a figure which shows the state by which the binding head upper part and the binding head lower part were abutted in the state shown by FIG. It is a figure which shows the state which the bundling head upper part raised from the state shown by FIG. 16, and was positioned in standby.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Binding apparatus, 2 reels, 3 binding tapes, 6 to-be-bundled objects, 40 servo motors (reel drive means), 44 sensor dogs (rotation displacement detection means), 45 micro photo sensor (rotation displacement detection means)

Claims (2)

A bundling device in which a bundling tape of a predetermined length drawn from a reel is wound around a bundling object,
A servo motor that applies tension to the binding tape by rotationally driving the reel in a tape winding direction;
A sensor dog that is formed in a disc shape and is provided with a plurality of slits at the periphery, and rotates around the center line as the reel rotates.
Detecting a number of the slits corresponding to the rotational displacement of the sensor dog, and outputting a pulse signal having a number of pulses corresponding to the number of the detected slits;
A control device that sets the rotational torque of the reel to any one of a plurality of stages according to the number of pulses of the pulse signal output from the microphotosensor;
Bundling apparatus according to claim including things. A servo motor that applies tension to the binding tape by rotationally driving the reel in the tape winding direction, and a disc-like shape and a plurality of slits are equally arranged on the periphery, so that the reel is rotated. A sensor dog that rotates around a center line along with the micro photo sensor that detects the number of slits corresponding to the rotational displacement of the sensor dog and outputs a pulse signal having a pulse number corresponding to the number of the detected slits. A binding tape tension adjusting method used in a binding device for winding a binding tape of a predetermined length drawn from the reel around a binding object ,
A method for adjusting the tension of a binding tape , wherein the rotational torque of the reel is set to any one of a plurality of stages according to the number of pulses of a pulse signal output from the microphotosensor .

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