JPH11292011A - Band tying machine - Google Patents

Abstract

(57) [Problem] To provide a band binding machine which can improve the stop position accuracy of a cam mechanism and can perform forward and reverse rotation operations. SOLUTION: A band binding machine 40 includes a band sending mechanism 3 for sending out a band 1, a band tightening mechanism 4 for pulling back the band 1, and a band joining mechanism 5 for thermally fusing the band 1. The band joining mechanism 5 is driven by the rotation of the camshaft 21a to hold the tip end portion of the band 1 sent out, a band opening cam portion for releasing the band 1 from the guide path 2, and a tightened band 1 A rear end holding cam portion for holding the rear end portion side, a heater cam portion for inserting and removing the heater portion between the bands 1, a crimping cam portion for pressing the band heated by the heater portion, and a rear end portion of the band 1. A cam mechanism section 21 having a cutter cam section for cutting is provided. The drive source for rotating and driving the camshaft 21a is a servomotor 46 with an encoder, and includes a control unit 45 for driving and controlling the servomotor 46 by feedback of the rotational position of the camshaft 21a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band tying machine for tying an object to be tied with a band-shaped band made of heat-fusible polypropylene or the like.

[0002]

2. Description of the Related Art Conventionally, as this type of band binding machine, as shown in FIGS. 2 to 5, a band-like band 1 made of polypropylene or the like is pulled out from a band supply reel or the like (not shown), and an arch-shaped guide path 2 is provided. , A band tightening mechanism 4 for pulling back and tightening the sent band 1, and a superposition of the band 1 sent out by the band sending mechanism 3 and the band 1 pulled back by the band tightening mechanism 4. There is a band tying machine 6 provided with a band joining mechanism 5 for heat-sealing the shaped parts to each other.

The band delivery mechanism 3 includes a delivery roller 8 for delivering the band 1, and a driven roller 10 which is rotatably pressed by the electromagnetic actuator 9 so as to be able to come into contact with and separate from the delivery roller 8. The rotation power of the motor 11 is configured to be transmitted to the delivery roller 8 via a power transmission mechanism such as a belt and a pulley.

Further, the band tightening mechanism 4 includes a band 1
Tightening roller 12 for pulling back and tightening relatively quickly
And the primary tightening roller 1 by the electromagnetic actuator 13
2, a driven roller 14 that can be freely pressed and contacted with the roller 2;
Tightening roller 1 for tightening and band 1 more strongly
5 and a rotatable driven roller 17 which is pressed against and separated from the secondary tightening roller 15 by an electromagnetic actuator 16
And The primary tightening roller 12 transmits the rotational power of the induction motor 11 via a power transmission mechanism such as a belt and a pulley, similarly to the delivery roller 8.
The secondary tightening roller 15 is configured to transmit the rotational power of the induction motor 11 via a power transmission mechanism such as a belt and a pulley, an electromagnetic clutch 18 that can be freely connected and disconnected, and a speed reducer 19.

The band joining mechanism 5 includes a cam mechanism 21 for transmitting the rotational power of the induction motor 11 via a power transmission mechanism such as a belt and a pulley, an electromagnetic clutch 20 which can be freely connected and disconnected, and the cam mechanism 21. Sensor unit 22 for detecting the rotational position of cam shaft 21a
And an electromagnetic brake 23 that brakes the rotation of the camshaft 21a in response to a detection signal from the timing sensor unit 22. The cam mechanism unit 21 has a distal end as a distal end holding cam unit as shown in FIG. Part clamping operation cam body (not shown)
The slide table 24 and the front-end holding body 25 that hold the front end of the band 1 that has been sent out are operated by the rear end holding operation cam body (not shown) as the rear end holding cam section, and tightened. A pair of rear holding members 26 and 27 for holding a predetermined position of the band 1 and a heater operating cam body (not shown) serving as a heater cam portion are inserted so as to be freely inserted into and removed from the overlapping band 1. A crimping joint 29 which is operated by a crimping cam unit (not shown) serving as a crimping cam unit and which presses the band 1 heated and melted by the heater unit 28 in cooperation with the slide table 24; A cutter unit 30 that is operated by a cutter operation cam body (not shown) as a cutter cam unit and cuts the rear side of the band 1 that is heat-sealed to each other. There is a example was structure.

As shown in FIG. 4, the guide path 2 has an arch-shaped fixed frame 32 fixedly attached to the band tying machine 6 side, and can be freely moved toward and away from one side of the fixed frame 32. The movable frame 33 is configured by a frame operating cam body (not shown) as a band opening cam section of the cam mechanism section 21.

As shown in FIG. 5, a rectangular cylindrical guide frame 34 is provided between the primary tightening roller 12, the secondary tightening roller 15, the delivery roller 8, and the like. 1 are guided, and portions of the guide frame 34 corresponding to the primary tightening roller 12 and the driven roller 14, the secondary tightening roller 15 and the driven roller 17, the delivery roller 8 and the driven roller 10, respectively, A notch opening is formed as appropriate to hold the band 1 releasably.

In FIG. 2, reference numeral 35 denotes a control unit for controlling the band binding machine 6, which controls the induction motor 11, the electromagnetic actuators 9, 13, 16 and
The electromagnetic clutches 18 and 20 and the electromagnetic brake 23 are controlled.

When the objects to be bound such as newspapers are to be bound, the objects to be bound are set on a mounting table partially including the slide table 24, and the power is turned on. Is rotationally driven, and the delivery roller 8 is rotationally driven via a power transmission mechanism. At this time, each of the electromagnetic clutches 18 and 20 is in a disconnected state, each of the driven rollers 14 and 17 is in a retracted state, and
Is pressed against the delivery roller 8, and the band 1 sandwiched between the delivery roller 8 and the driven roller 10 is sequentially delivered with the rotation of the delivery roller 8.

Then, when the band 1 is guided along the guide path 2 and it is detected that the leading end of the band 1 has reached the end position of the guide path 2, the electromagnetic clutch 20 is operated to establish the connected state. Note that this arrival is detected when the leading end of the band 1 reaches the end position of the guide route 2 and the band 1
Is controlled by the sensor detecting that slippage occurs between the delivery roller 8 and the band 1 due to the restriction of the delivery of the driven roller 10 and the driven roller 10 stops rotating.

The detection of the arrival makes the driven roller 1
0 is in a retracted state, and the feeding of the band 1 is stopped.

When the electromagnetic clutch 20 is connected, the cam shaft 21a of the cam mechanism 21 is driven to rotate. First, the tip holding body 25 is moved to the slide table 24 side by the tip holding operation cam body. The front end of the band 1 is held between the front end holding body 25 and the front end holding body 25. Further, the movable frame 33 is retracted by the frame operating cam body as shown by the imaginary line in FIG. When the holding of the band 1 is detected by the timing sensor unit 22, the electromagnetic clutch 20 is turned off and the electromagnetic brake 2 is turned off.
3 is operated, and the tip of the band 1 is held in a state of being held between the slide table 24 and the tip holding body 25.

The driven roller 14 is brought into pressure contact with the primary tightening roller 12 by the detection of the timing sensor section 22, and the band 1 is pulled back with the rotation of the primary tightening roller 12, Primary tightening is performed. As in the case of the driven roller 10, the completion of the primary tightening is detected by detecting by a sensor that the driven rotation of the driven roller 14 has stopped due to slippage.

When the completion of the primary tightening is detected, the driven roller 17 is pressed against the secondary tightening roller 15, the driven roller 14 is retracted, and the electromagnetic clutch 18 is connected. . Here, the secondary tightening roller 15 is rotationally driven via the speed reducer 19, and the rotational driving of the secondary tightening roller 15 causes the band 1 to be pulled back more strongly, so that the secondary tightening is performed. This secondary tightening is performed continuously for a fixed time according to the setting of a timer. When a predetermined time has elapsed, the electromagnetic brake 23 is released, the electromagnetic clutch 20 is connected, and the electromagnetic clutch 18 is disconnected.

By the connection of the electromagnetic clutch 20, the camshaft 21a is further driven to rotate, and the pair of rear holding members 26, 27 are moved closer to each other by the rear end holding operation cam body. , 27, the rear end side of the band 1 in the feeding direction is clamped,
It is held in this sandwiched state.

Thereafter, the cam shaft 21a is further driven to rotate, so that the position of the band 1 held between the slide table 24 and the front end holding member 25 and the position of the band 1 held between the rear holding members 26 and 27 are changed. The heater portion 28 is operated to intrude from one side by the heater operation cam body into the gap between the overlapping portions of the band 1 formed at appropriate intervals in the vertical direction. When detected by the timing sensor section 22, the electromagnetic clutch 20
Is turned off and the electromagnetic brake 23 is operated. Thereafter, the upper and lower bands 1 are heated by the heater unit 28 for a predetermined time according to a timer setting, and then the electromagnetic brake 23 is released and the electromagnetic clutch 20 is connected.

Then, by the connection of the electromagnetic clutch 20, the cam shaft 21a is further driven to rotate, and the heater portion 28 is retracted to the initial position by the heater operating cam body. Is moved to the slide table 24 side, and the crimped joint 29 is
Are pressed toward the slide table 24 with the band 1 in the overlapped state held therebetween. Due to this pressing, the opposing surfaces of the bands 1 that have been heated and melted by the heater unit 28 are fusion-bonded to each other, and the superposed bands 1 are thermally fused to each other. The pressing time is set to a predetermined time by a timer setting, and when the pressing state is detected by the timing sensor unit 22,
The electromagnetic clutch 20 is turned off and the electromagnetic brake 23 is operated.

When the heat fusion is completed after the predetermined time has elapsed, the electromagnetic brake 23 is released and the electromagnetic clutch 20 is connected, the cam shaft 21a is further driven to rotate, and the cutter operating cam body causes the cutter to operate. The part 30 is operated, and the rear end of the band 1 in the feeding direction is cut.

Thereafter, the cam shaft 21a is further driven to rotate, the slide table 24 is retracted by a table operating cam body (not shown) in the cam mechanism 21, and the objects 36 to be bound are placed on the mounting table. You can remove it from above.

On the other hand, the camshaft 21a is further driven to rotate thereafter, and the timing sensor unit 22 detects the origin, whereby the electromagnetic clutch 20 is turned off, the electromagnetic brake 23 is operated, and the induction motor 11 is stopped. , Each section is configured to return to the initial state.

[0021]

However, according to the above-described conventional band binding machine 6, the stop positions of the cam shafts 21a in the cam mechanism 21 are determined by the timing sensor 22 so that the electromagnetic clutch 20 is disconnected. And the electromagnetic brake 23 is actuated.
The stop position of the camshaft 21a may vary due to slippage or the like that occurs during braking.

Further, since an error occurs in the position detected by the timing sensor unit 22 between the forward rotation and the reverse rotation, the cam shaft 21a is rotationally driven by the induction motor 11 in a fixed direction. However, even if an error occurs during the bundling process, it is necessary to operate for one cycle, and it is not possible to return to the initial state due to the reverse rotation of the induction motor 11.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a band binding machine which can improve the stop position accuracy of a cam mechanism and can perform forward and reverse rotation operations.

[0024]

Technical means for solving the above problems include a band sending mechanism for sending out the band along a predetermined guide path, a band tightening mechanism for pulling back the sent out band and tightening the band. A band joining mechanism for thermally fusing a superposed portion of the band sent out by the band sending mechanism and the band pulled back by the band tightening mechanism, wherein the band joining mechanism is driven by rotation of a cam shaft. A tip holding cam portion for holding a band tip portion sent out along the guide route, a band opening cam portion for releasing the band from the guide route, and a rear end portion side in the sending direction of the tightened band. Rear end holding cam portion, a heater cam portion for inserting and removing a heater portion between the overlapped bands, and a heater heated by the heater portion. A crimping cam portion for crimping the command, the band binding machine comprising comprises a cam mechanism having a cutter cam portion for cutting the rearward end portion feeding of the band,
The drive source for rotating the camshaft is a servomotor with an encoder, and a control unit for controlling the drive of the servomotor by feedback of the rotational position of the camshaft is provided.

Further, a band driving roller which can be driven forward and backward to send out the band and pull back the band and a driven roller which is pressed against the band driving roller are provided, and a driving source which drives the band driving roller forward and backward. Is a servomotor with an encoder, and the control unit controls the servo by feedback of a band sending amount and a torque command value corresponding to the sending amount and feedback of a band retraction amount and a torque command value corresponding to the retraction amount. The motor may be configured to perform forward / reverse drive control.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a band binding machine 40, and the same components as those of the conventional band binding machine 6 have the same reference numerals. And the description is omitted.

In the present band tying machine 40, as in the prior art, a band sending mechanism 3 for sending a band-shaped band 1 made of heat-fusible polypropylene or the like along an arch-shaped guide path 2, Band tightening mechanism 4 for pulling back and tightening, and a band joining mechanism 5 for thermally fusing together a superposed portion of the band 1 sent out by the band sending mechanism 3 and the band 1 pulled back by the band tightening mechanism. It is provided with a structure.

In the present embodiment, the band sending mechanism and the band tightening mechanism are connected to a band driving roller 41 driven forward and reverse and a roller pressed to be brought into and out of contact with the band driving roller 41 by an electromagnetic actuator 42. The structure is also used by the movable roller 43 that can move freely.

A driving source for driving the band driving roller 41 in the forward and reverse directions is a servomotor 44 with an encoder.
The servomotor 44 is controlled by a control unit 45 to drive forward and reverse.

The guide path 2 and the guide frame 34
Is constructed similarly to the above-mentioned conventional structure.

The arrival at the end position of the guide route 2 due to the delivery of the band 1 is determined by setting the delivery amount up to the arrival at the end position of the band 1 as an arrival set value in advance, detecting the delivery amount by the encoder, and determining the delivery amount. The end position arrival is detected by detecting that the quantity has reached the arrival set value. In addition, the torque command value for sending out band 1 is set to a low torque.

Further, the detection of the winding of the band 1 around the object to be bound 36 due to the retraction of the band 1 is performed by setting the amount of rewinding to be wound in accordance with the size of the object to be bound 36 in advance as a winding set value. The retracted amount is detected by an encoder, and the winding state is detected by detecting that the retracted amount has reached a winding set value. Also, the torque command value for pulling back the band 1 at this time is set to a low torque.

Then, the secondary tightening is performed by detecting that the torque when the band driving roller 41 rotates in the retraction direction reaches a predetermined torque command value set in advance as a tightening torque value. Is detected.

The camshaft 2 in the band joining mechanism 5
The drive source for rotating the motor 1a is also a servomotor 46 with an encoder, and the servomotor 46 is also controlled by the control unit 45 in forward and reverse directions.

Further, the cam mechanism 21 is provided on the cam shaft 21a.
1 is provided with an origin sensor 47 for detecting the origin position, and includes a front end clamping operation cam body, a frame operation cam body, a rear end clamping operation cam body, a heater operation cam body, a pressure bonding cam body, and a cutter. The operation cam body and the table operation cam body are configured in the same manner as in the prior art.

The timing of holding the front end of the band 1 by the operation of the front end holding operation cam body, the timing of opening the band 1 from the guide path 2 by the operation of the frame operation cam body, and the rear end holding operation cam The timing of pinching the rear end side of the band 1 in the feeding direction by the operation of the body, the timing of putting the heater portion 28 in and out of the overlapped band 1 by the operation of the heater operation cam body, and the operation of the pressure bonding cam body The timing for pressing the band 1 formed into the overlapped state by the above, the timing for cutting the rear end portion of the band 1 in the feeding direction by the operation of the cutter operation cam body, and the timing for operating the slide table 24 by the operation of the table operation cam body are as follows. , The rotational position of the camshaft 21a is detected by feedback from the encoder,
The servo motor 46 is controlled to stop driving.

The present embodiment is configured as described above. When the objects to be bound 36 are to be bound as in the prior art, the objects to be bound 36 are set on a mounting table partially including the slide table 24. When the power is turned on, first, the servo motor 44 on the band 1 side is rotationally driven in the band 1 sending direction. At this time, the driven roller 43 is pressed against the band driving roller 41 and the band driving roller 4
The band 1 held between the band 1 and the driven roller 43 is sequentially sent out as the band driving roller 41 rotates. At this time, the feed amount of the band 1 and the torque command value corresponding to the feed amount are fed back, and it is detected whether the band 1 is normally sent.

When the band 1 is guided along the guide path 2 and it is detected that the amount of band 1 has reached the set arrival value, the servomotor 44 is stopped and the band 1 is stopped. Further, the servo motor 46 of the cam mechanism 21 is driven to rotate.

The arrival of the end position of the guide path 2 of the band 1 is detected by the servo motor 44 not following the command value for the servo motor 44 because the tip of the band 1 hits the end position of the guide path 2. This can also be detected by detecting the fact by feedback.

Then, the cam shaft 21a of the cam mechanism 21 is driven to rotate by the rotation of the servo motor 46.
As shown in (1), the tip holding member 25 is moved toward the slide table 24 by the tip holding operation cam body, and the slide table 24 and the tip holding member 25 hold the tip of the band 1. At this time, the movable frame 33 is retracted by the frame operating cam as shown by the imaginary line in FIG. When the band 1 is detected by the feedback of the rotational position of the cam shaft 21a, the servo motor 46
Is stopped, and the end of the band 1 is held in a state of being held between the slide table 24 and the end holding body 25.

When the band 1 is detected to be pinched, the servo motor 44 of the band 1 is driven to rotate in the band 1 retraction direction opposite to the above. At this time, the driven roller 43 is pressed against the band driving roller 41, and the band 1 sandwiched between the band driving roller 41 and the driven roller 43 is sequentially pulled back with the rotation of the band driving roller 41, Primary tightening is performed.

The completion of the primary tightening is detected by detecting that the retraction amount of the band 1 has reached the winding set value. Thereafter, the band is driven by the rotation of the band driving roller 41 to further tighten the torque. Is gradually increased to reach the tightening torque value, whereby completion of the secondary tightening is detected.

When the completion of the secondary tightening is detected, the servomotor 44 is stopped, and the retraction of the band 1 is stopped. Further, the servo motor 46 on the cam mechanism 21 side is rotationally driven, the cam shaft 21a is further rotationally driven, and the pair of rear holding members 26 and 27 are moved closer to each other by the rear end holding operation cam body. The rear end side of the band 1 tightened by the rear holding members 26 and 27 in the sending direction is held and held in this holding state.

Thereafter, the camshaft 21a is further driven to rotate, so that the position of the band 1 held between the slide table 24 and the front end holding body 25 and the position of the band 1 held between the rear holding bodies 26 and 27 are changed. The heater portion 28 is operated to intrude from one side by the heater operation cam body into the gap between the overlapping portions of the band 1 formed at appropriate intervals in the vertical direction. Camshaft 21
When it is detected by the feedback of the rotational position a, the servomotor 46 is stopped.

After that, the upper and lower bands 1 are heated by the heater unit 28 for a predetermined time according to a timer setting, and then the servomotor 46 is driven to rotate, the cam shaft 21a is further driven to rotate, and the heater unit 28 is driven by the heater operating cam body. The crimped joint 29 is moved to the slide table 24 side by the crimped cam body, and the crimped joint 29 is moved to the slide table 24 side by holding the band 1 in the overlapped state. Pressed. Due to this pressing, the opposing surfaces of the bands 1 that have been heated and melted by the heater unit 28 are fusion-bonded to each other, and the superposed bands 1 are thermally fused to each other. The pressing time is set to a predetermined time by a timer setting. When the pressing state is detected by the feedback of the rotational position of the cam shaft 21a, the servo motor 46
Is stopped.

When the heat fusion is completed after the lapse of the predetermined time, the servo motor 46 is driven to rotate and the camshaft 21 is rotated.
is further driven to rotate, the cutter unit 30 is operated by the cutter operation cam body, and the rear end of the band 1 in the feeding direction is cut.

Thereafter, the cam shaft 21a is further rotated, the slide table 24 is retracted by the table operating cam body, and the binding object 36 bound here may be taken out from the mounting table.

On the other hand, the cam shaft 21a is further driven to rotate thereafter, and when the origin sensor 47 detects the origin,
The configuration is such that the servomotor 46 is stopped, and each section returns to the initial state.

The present embodiment is configured as described above. Since the servo motor 46 with the encoder is employed as the drive source of the cam mechanism 21, the servo motor 46
The rotational position of the camshaft 21a, which is rotationally driven by the camshaft 21a, can always be monitored by feedback from the encoder, and there is no stop position error due to slippage or the like that occurs during braking by the electromagnetic brake 23 as in the related art. The stop position accuracy is accurately obtained, and the timing sensor unit 22 for detecting each stop position as in the related art is not required. Thus, high-precision start / stop control can be performed, and troubles due to misalignment of the stop position can be prevented. Can be effectively prevented,
A highly reliable band binding machine 40 can be provided. And
Since the stop position of the rotation position of the camshaft 21a can be controlled with high accuracy by the feedback from the encoder, the forward rotation and the reverse rotation of the servomotor 46 can be controlled.

The rotation speed and drive stop of the servo motor 46 can be freely set by setting parameters, and the rotation speed of the cam shaft 21a can be adjusted to different rotation speeds according to the rotation angle. Of each band can be set and adjusted individually.
The heating time by the heater section 28 and the time for fusing and curing the band 1 by pressing the band 1 with the slide table 24 and the press-bonded body 29 can be adjusted as desired, and the band 1 having various thicknesses and widths can be easily handled.

That is, the rotational speed pattern of acceleration / deceleration of the rotational speed is determined according to the rotational position of the cam shaft 21a, and various speed patterns are parameterized, and the speed is adjusted to a speed pattern suitable for the characteristics of the band 1 to be used. Work can be performed, and at the time of each operation of each cam body of the cam mechanism section 21, the rotation speed of the camshaft 21a suitable for each operation, and the camshaft 2 between each operation of each cam body.
By setting the rotation speed of 1a to a higher speed, the jump of the operation by each cam body can be effectively prevented, and the speed of the binding operation can be increased.

The cam shaft 21a is driven forward and reverse by the servo motor 46.
0, the electromagnetic brake 23, a belt, a pulley, and the like are not required, so that the structure can be simplified, the number of consumables can be reduced, the failure rate can be reduced, and the maintainability can be improved.

Further, since the servo motor 44 with the encoder is also used as a driving source which also serves as the band sending mechanism 3 and the band tightening mechanism 4, it corresponds to the feeding speed and the pulling speed of the band 1, the feeding amount and the pulling amount. The desired torque command values and the like can be adjusted as desired.
Is a method in which the control unit 45 monitors the feed amount of the band 1 and feedback of the torque command value corresponding to the feed amount by the control unit 45. Has arrived at the end position of the guide route 2 and the arrival of the end position of the band 1 can be easily detected. Then, the next operation can be performed. After detecting the stop of the driven rotation of the driven roller 10, the working time can be reduced and the working efficiency can be improved as compared with the case where the next operation is started.

Further, when the band 1 is sent out, if the band 1 is clogged in the guide path 2 or the band 1 jumps out of the guide path 2, it can be easily detected due to torque abnormality due to the feedback. By controlling the band 1 to be easily pulled back to the initial position by the position detection by, and then re-sent, it is possible to immediately cope with an abnormal feeding, thereby improving the working efficiency.

When the band 1 is pulled back, the servo motor 46 can control forward and reverse rotations. If the slide table 24 is retracted by rotating the cam shaft 21a in the reverse direction, the band 1 can be pulled back and collected. Since the operation is performed more smoothly and there is no need to perform one cycle operation as in the conventional method, waste of the band 1 due to cutting of the cutter unit 30 can be effectively prevented.

Further, the system detects the arrival at the end position of the guide path 2 based on the feed amount. Even if the band 1 is thin, it can be easily coped with by adjusting the feed speed. Therefore, the torque command value can be set freely, so that it is possible to easily cope with it, and it is not necessary to adjust the individual pressing force of the driven rollers 10, 14, and 17 as in the related art. , And excellent in versatility.

Further, the secondary tightening is completed when the final tightening force also reaches a preset torque command value, so that a stable tightening force can always be obtained when tightening the band 1 on the material 36 to be bound. And reliability can be improved.

Further, since the position of band 1 can be detected by the encoder of the servo motor 44, the control unit 45
Thereby, the feeding speed when the tip of the band 1 at the time of sending out the band 1 passes through the portion corresponding to the corner 2a of the guide path 2 is controlled to be slow, and the portion corresponding to the linear portion 2b of the guide path 2 is controlled. By controlling the sending speed at the time of passing faster, buckling and clogging of the band 1 in the guide path 2 can be effectively prevented, and a faster sending operation can be performed.

When the band 1 is pulled back, the control unit 45 controls the retraction speed until the band 1 leaves the guide route 2 at a low speed, and also controls the retraction speed after the band 1 leaves the guide route 2. The quick control can effectively prevent the band 1 from twisting during binding.

Further, the band sending mechanism 3 and the band tightening mechanism 4 are also used by a single band driving roller 41 and a servo motor 44.
4 directly drives the band drive roller 41 in the forward and reverse directions.
Belts and pulleys are not required, simplifying the structure, reducing the number of consumables, and reducing the failure rate.
Maintenance performance can be improved.

Further, since the amount of pullback can be detected, it is possible to easily cope with a change in the binding object 36 such as a large bundle or a small bundle, and the tightening force can be optimally set according to each situation. Then, when binding using the guide claw 48, such as the binding of a small bundle of objects 36a such as newspapers,
Since the rewind amount can be detected, the band 1
In the case where the nail 8 comes off, it can be easily detected by detecting the retraction amount equal to or larger than the set value, and the empty binding can be effectively prevented.

When an abnormality is detected due to the detection of the retraction amount equal to or larger than the set value of the band 1, the servo motor 46 of the cam mechanism 21 is driven to rotate in the reverse direction, so that the slide table 24 and the front-end holding body 25 pinch. The state can be canceled, and the retracting operation of the slide table 24 has an advantage that the operation of pulling the band 1 back to the initial position by the driving of the band driving roller 41 can be performed more smoothly.

If the tightening speed when the band 1 is wound around and tied to the material 36 to be bound is controlled to be low, the band 1
Can be effectively prevented from being twisted, the band 1 being torn, and the object 36 to be bound being damaged.

Further, since the pulling-back speed, the tightening force and the like can be arbitrarily changed, the objects to be tied such as the large object to be tied 36, the small object to be tied 36, the flexible object to be tied 36, the cardboard, etc. 36, etc., can be adjusted according to the size, rigidity, etc. of the binding object 36, and the optimum binding according to various binding objects 36 can be easily performed, and there is an advantage that the setting change can be easily changed by the parameter.

Further, the servo motors 44 and 46 need only be driven only when necessary, such as when the band 1 is sent out or pulled back, and the economy is excellent.

Further, there is an advantage that the operation state can be visually confirmed by performing the super slow operation of each of the servo motors 44 and 46 at the time of maintenance.

Further, according to a change in hardness of the band 1 due to a change in the outside air temperature, the control unit 45 may automatically control the sending speed, the retraction speed, the torque command value, the rotation speed of the camshaft 21a, and the like.

The control section 45 may control the heater section 28 to maintain a predetermined temperature in accordance with a change in outside air temperature, or may control the heating time of the band 1 to be adjusted.

Further, a structure may be provided in which an alarm or the like informs the user of an abnormality such as jamming in the guide path 2 when the band 1 is sent out, jumping out of the guide path 2 and empty binding when the band 1 is pulled back.

[0070]

As described above, according to the band binding machine of the present invention, the drive source for rotating the camshaft is a servomotor with an encoder, and the servomotor is driven and controlled by the feedback of the rotational position of the camshaft. A control unit for controlling the rotation position of the camshaft can be precisely controlled by feedback from an encoder, and the stop position accuracy of the cam mechanism can be improved. Accurate stop position accuracy can be ensured, and the forward / reverse rotation control of the servomotor can be accurately performed.

Further, a band driving roller that can be driven forward and backward to send out the band and pull back the band is provided, and a driven roller that is pressed against the band driving roller is provided. A driving source that drives the band driving roller forward and backward is provided. A servomotor with an encoder, wherein the control unit feeds back the feed amount of the band and the torque command value according to the feed amount, and feeds back the band withdrawal amount and the torque command value according to the pullback amount with the servomotor. Has a merit that forward and reverse drive control of the band can be easily detected, and the band can be easily detected, and the work efficiency is good, a stable tightening force can be obtained, and the band can be applied to various bands.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of the present invention.

FIG. 2 is a schematic explanatory view showing a conventional example.

FIG. 3 is a schematic explanatory view of a cam mechanism.

FIG. 4 is a sectional view of a guide route.

FIG. 5 is a sectional view of a guide frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Band 2 Guide path 2a Corner part 2b Linear part 3 Band sending mechanism 4 Band tightening mechanism 5 Band joining mechanism 21 Cam mechanism part 21a Cam shaft 36 Binding object 40 Band binding machine 41 Band drive roller 42 Electromagnetic actuator 43 Follower roller 44 Servo Motor 45 Control unit 46 Servo motor 47 Origin sensor unit

Claims (2)

[Claims] 1. A band feeding mechanism for feeding a band along a predetermined guide path, a band tightening mechanism for pulling back and tightening the fed band, and a band fed by the band sending mechanism and being pulled back by the band tightening mechanism. A band joining mechanism for heat-sealing the overlapped portion of the band with the band, and the band joining mechanism sandwiches the tip of the band sent out along the guide path by rotating a cam shaft. A front end holding cam portion, a band opening cam portion for releasing the band from the guide path, a rear end holding cam portion for holding the rear end portion side in the feed direction of the tightened band, and a portion between the overlapped band. A heater cam section for taking the heater section in and out, a crimp cam section for crimping the band heated by the heater section, and a A band binding machine comprising a cam mechanism having a cutter cam section for cutting a portion, wherein a drive source for driving the cam shaft to rotate is a servo motor with an encoder, and the servo motor is fed back by a rotation position of the cam shaft. A band tying machine comprising a control unit for controlling the driving of the band. 2. A drive source for driving the band drive roller forward and backward, comprising a band drive roller capable of forward and reverse drive for sending out the band and pulling back the band, and a driven roller pressed against the band drive roller. Is a servomotor with an encoder, and the control unit controls the servo by feedback of a band sending amount and a torque command value corresponding to the sending amount and feedback of a band retraction amount and a torque command value corresponding to the retraction amount. 2. The motor according to claim 1, wherein the motor is driven forward and backward.
The band tying machine described.