JP2000103407A - Band bundling machine and method for controlling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a band bundling machine wherein a good bundling can be achieved even if a soft work or a work which is easy to break is bundled. SOLUTION: There are provided a band pay-out mechanism 3 to pay out a band 1 along a guide route 2, a band tightening mechanism 4 which pulls back the band 1 to wind it around a work 36, and a band joining mechanism 5 to thermally bond a stacked portion of the band 1. A band drive roller 41 which can be driven normally and reversely to pay out or pull back the band 1 and a driven roller 43 which is pressed by the roller 41 are provided. A set input part 46 is provided to set a bundling length around the work 36 at a locating where the band 1 is wound. A servomotor 44 is provided with encoder to normally and reversely drive the roller 41. A control part 45 is provided to control the pulled back amount of the paid out band 1 based on the amount of rotational drive of the servomotor 44 corresponding to a bundle length set in the input part 46.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band binding machine for binding a work as an object to be bound by a band-like band made of heat-fusible polypropylene or the like, and a method for controlling the band binding machine.

[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 work 36 such as a newspaper is bound, the work 36 is set on a mounting table partially including the slide table 24, and when the power is turned on, the induction motor 11 is driven to rotate. The delivery roller 8 is driven to rotate via the 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 work 36 bound here is moved from the mounting table. I just need to take it out.

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 band 1 is tightened by the rotation of the primary tightening roller 12 so that the band 1 is pulled back. This is a method of detecting the completion of the primary tightening by detecting by a sensor that the driven rotation of the driven roller 14 has stopped due to the slip between the primary tightening roller 12 and the band 1 at that time, In addition, since the band 1 is more strongly pulled back by the rotation driving of the secondary tightening roller 15 for a predetermined time and the secondary tightening is performed, a tightening torque is always generated in a work binding state, and a small number of newspapers or the like is used. As described above, when a flexible work or a fragile work such as a bouquet is bound, there is a drawback that the shape is broken or damaged, and it is difficult to obtain a good bundle.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a band tying machine and a control method of the band tying machine which can obtain good tying even for a flexible work or a fragile work.

[0023]

Technical means for solving the above-mentioned problems include a band sending mechanism for sending out the band along a predetermined guide path, and a band tightening mechanism for pulling back the sent out band and winding the band around a work. In a band binding machine having a band joining mechanism for heat-sealing a superposed portion of the band sent out by the band sending mechanism and the band pulled back by the band tightening mechanism, A band drive roller that can be driven forward and backward to pull back the band and a driven roller that is pressed against the band drive roller are provided, and a setting input unit that sets a binding length around the work at a position where the band is wound around the band is provided. A driving source for driving the band driving roller in the forward and reverse directions is a servomotor with an encoder; In accordance with the set binding length is a pull-back amount of the fed bands in a point which is provided with a control unit for controlling the rotational driving of the servo motor.

[0024] Further, the technical means of the method for solving the above-mentioned problems includes a band sending step of sending the band along a predetermined guide path, and a band wound back around the work by pulling back the band sent by the band sending step. A tightening step, and a method of controlling a band tying machine including a band joining step of thermally fusing a superposed portion of a band sent out by the band sending step and a band pulled back by the band tightening step, A band drive roller capable of forward / reverse drive capable of sending out the band and pulling back the band, and a driven roller pressed against the band drive roller are provided, and a drive source for forward / reverse drive of the band drive roller is a servo with an encoder. It is a motor and sets the binding length around the work at the position where the band is wound Constant input unit is provided, in accordance with been bundled length set in the setting input unit, a pull-back amount of the band in the band tightening process lies in that for controlling the rotation drive of the servo motor.

[0025]

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, the band sending mechanism 3 for sending out the band-like band 1 made of heat-fusible polypropylene or the like along the arch-shaped guide path 2, and the band 1 Band pulling mechanism 4 that pulls back and winds it around the work 36, and band bonding that thermally fuses together the superposed portions of the band 1 sent out by the band sending mechanism 3 and the band 1 pulled back by the band tightening mechanism. The structure has a mechanism 5.

In the present embodiment, the band sending mechanism and the band tightening mechanism are connected to a band driving roller 41 which is driven forward and reverse, and a roller which is brought into and out of contact with the band driving roller 41 by an electromagnetic actuator 42 so as to be freely separated from the band driving roller 41. 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 servo motor 44 is configured to be controlled by a control unit 45 in forward and reverse directions.

Further, the band binding machine 40 is provided with a setting input section 46. The peripheral length of the work 36 at the position where the band 1 is wound around is set as the binding length from the setting input section 46, and data is appropriately input using a numeric keypad or the like. It is configured to be able to set.

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 sending out of the band 1 is set by inputting data in advance by the setting input unit 46 with the sending amount up to the arrival at the end position of the band 1 as an arrival set value. To detect the arrival at the end position by detecting that the delivery amount 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 work 36 due to the pulling back of the band 1 is performed by calculating the pulling amount in the winding state according to the data input as the binding length from the setting input unit 46, and setting the pulling amount. It is configured to be set as a value. That is, assuming that the arrival installation value is L, the binding length is R, and the length of the overlapped portion of the portion to be polymerized for thermal fusion is S, the setback amount P is P = L−R−S Required by

The winding state is detected by detecting the amount of retraction by the encoder and detecting that the amount of retraction has reached the set value of the retraction amount. Also, the torque command value for pulling back the band 1 at this time is set to a low torque.

Then, when the secondary tightening is to be performed as required, the tightening torque value is input and set in advance from the setting input unit 46, so that the torque when the band driving roller 41 rotates in the retraction direction is set. Is detected as having reached a predetermined torque command value previously input and set as a tightening torque value, thereby detecting the completion of the secondary tightening.

The camshaft 2 in the band joining mechanism 5
The drive source for rotating the motor 1a is also a servomotor 47 with an encoder.
The drive is controlled in the forward and reverse directions.

Further, the cam mechanism 21 is provided on the cam shaft 21a.
1 is provided with an origin sensor section 48 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 clamping the front end of the band 1 by the operation of the front end clamping 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 clamping 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 47 is controlled so as to stop driving.

When binding a flexible work 36 that can be easily deformed, such as a small number of newspapers, the work 36 is set on a mounting table that partially includes the slide table 24, and is set in advance. A binding length corresponding to the outer peripheral length of the work 36 bound from the input unit 46 is input and set in advance. When the binding operation power supply is turned on, first, the servo motor 44 on the band 1 side
It is driven to rotate in the feeding direction. At this time, the driven roller 4
The band 3 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 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 47 on the cam mechanism 21 side 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 camshaft 21a of the cam mechanism section 21 is rotationally driven by the rotational drive of the servomotor 47, and FIG.
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 camshaft 21a, the servomotor 47 is detected.
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 on the side 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.

By detecting that the retraction amount of the band 1 has reached the calculated retraction amount set value, the servomotor 44 is stopped, and the retraction of the band 1 is stopped. In this state, the band 1 is wound around the outer periphery of the work 36 without generating a tightening torque. In addition, since it is the binding of the flexible work 36, the secondary tightening is not performed through the setting input unit 46.

When the servo motor 44 is stopped after it is detected that the retract amount has reached the set value, the servo motor 47 of the cam mechanism 21 is driven to rotate, and the cam shaft 21a is further driven to rotate. The pair of rear holding members 26 and 27 are moved closer to each other by the rear end holding operation cam body, and the rear end side of the band 1 tightened by the two rear holding members 26 and 27 in the feeding direction is held. Is held.

Thereafter, the cam shaft 21a is further driven to rotate, and 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 is 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 47 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 servo motor 47 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. 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 47 is pressed.
Is stopped.

When the heat fusion is completed after the lapse of the predetermined time, the servomotor 47 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 work 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 unit 48 detects the origin,
The configuration is such that the servomotor 47 is stopped, and each section returns to the initial state.

The present embodiment is configured as described above, and employs the servomotor 44 with an encoder as a drive source that also serves as the band sending mechanism 3 and the band tightening mechanism 4. Of the band 1 can be constantly monitored by the feedback from the encoder, the band 1 can be controlled with high accuracy, and the band binding machine 40 with high reliability can be controlled.
Can be provided. Accordingly, if the binding length corresponding to the outer peripheral length of the work 36 to be bound is input from the setting input unit 46 and set, and the work 36 is bound in accordance with the data, the band 1 is attached to the outer periphery of the work 36. Can accurately obtain a tied state in which no tightening torque is generated. Even if the work 36 is soft and flexible, the tying can be performed without generating the tightening torque by the band 1, that is, without deforming the work 36. There is an advantage that a good binding state can be stably obtained without damage.

Also, a work 3 that is easily broken such as a bouquet
Even in the case of 6, if the desired binding length is input as data through the setting input section 46, there is an advantage that the binding can be performed in a state where no tightening torque is generated.

Further, the feeding speed and the retraction speed of the band 1 and the respective torque command values corresponding to the feeding amount and the retraction amount can be adjusted as desired through the setting input section 46. This is a method in which the control unit 45 monitors by feedback of the amount and the torque command value corresponding to the sending amount. If the band 1 is sent out to the set arrival value without any abnormality, the leading end of the band 1 is at the end of the guide route 2. Has arrived at the location,
Since the arrival at the end position of the band 1 can be easily detected, and then the next operation can be performed, after the arrival at the end position as in the related art, the band 1 is further fed out and after the stop of the driven rotation of the driven roller 10 is detected, the next operation is performed. The working time can be shortened and the working efficiency can be improved as compared with the case of moving to the operation.

Further, when the band 1 is sent out, if the band 1 is jammed in the guide path 2 or the band 1 jumps out of the guide path 2, it can be easily detected due to the 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 47 can control forward and reverse rotations. If the slide table 24 is retracted by reversing the cam shaft 21a, 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, a method of detecting the arrival at the end position of the guide path 2 based on the amount of feeding is possible. Even a thin band 1 can be easily coped with by adjusting the feeding 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, since the position of the band 1 can be detected by the encoder of the servomotor 44, the control unit 45 causes the tip of the band 1 at the time of sending out the band 1 to the portion corresponding to the corner 2a of the guide path 2. , While controlling the sending speed when passing through the portion corresponding to the linear portion 2b of the guide path 2, the buckling of the band 1 in the guide path 2 The clogging can be effectively prevented, and a faster feeding operation can be performed.

Further, when the band 1 is pulled back, the control unit 45 controls the speed of pulling back until the band 1 is separated from the guide route 2 to be slow, and the guide route 2
By controlling the retraction speed after the band 1 is detached from the band, the torsion of the band 1 during binding can be effectively prevented.

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, by controlling the tightening speed when the band 1 is wound around and hit the work 36 at a low speed, it is possible to effectively prevent the band 1 from being twisted, the band 1 being torn and the work 36 from being damaged.

Further, since a servo motor 47 with an encoder is employed as a drive source of the cam mechanism 21,
Camshaft 21a rotated and driven by servomotor 47
The rotational position of the cam mechanism 21 can be constantly 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, and the respective stop position accuracy of the cam mechanism 21 can be accurately obtained. Here, the timing sensor unit 22 for detecting each stop position as in the related art is not required, and high-precision start / stop control can be performed. Trouble caused by a shift in the stop position can be effectively prevented. A high band binding machine 40 can be provided. Then, since the stop position of the rotational 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 47 can be controlled.

The rotation speed and drive stop of the servo motor 47 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 camshaft 21a, 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 47.
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 setting length can be arbitrarily changed by the setting input section 46, the large work 36, the small work 36, the flexible work 36, and the fragile work 3 can be changed.
6, etc., can be adjusted according to the size and rigidity of the work 36,
There is an advantage that the optimum bundling according to the various works 36 can be easily performed, and 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.

In the case of binding fixed-size objects such as newspapers, the binding length is obtained by inputting the stacked height information from the setting input section 46, and the set-back amount is set. The detection data information from the height sensor provided as appropriate may be input to the setting input unit 46 to determine the binding length and the setback amount set value. May be set. Further, the setting input unit 46
Alternatively, the binding length may be obtained and set by directly inputting the pull-back amount setting value into.

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

Further, when the band 1 is sent out, it is jammed in the guide route 2 or jumps out of the guide route 2,
A structure may be used in which an alarm or the like informs the user of an abnormality such as empty binding when the band 1 is pulled back.

[0071]

As described above, according to the band tying machine and the method of controlling the band tying device of the present invention, the band driving roller capable of forward / reverse drive for sending out the band and pulling back the band is provided with the band driving roller. A driven roller that is pressed against is provided, and a drive source that drives the band drive roller in the forward and reverse directions is a servomotor with an encoder, and a setting input unit that sets a binding length around the work at a position where the band is wound. In accordance with the binding length set in the setting input section, the amount of band retraction in the band tightening process is controlled by the rotational driving amount of the servo motor, and the band does not generate a tightening torque on the outer periphery of the work. It is possible to accurately obtain the binding state wrapped in the state, and does not deform the work even if it is a flexible work or a fragile work Can reliably unity, good cohesion state is advantageous in that stably obtained.

[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 36 Work 40 Band bundling machine 41 Band driving roller 42 Electromagnetic actuator 43 Follower roller 44 Servo motor 45 Control part 46 Setting input section

Claims (2)

[Claims] 1. A band sending mechanism for sending out a band along a predetermined guide path, a band tightening mechanism for pulling back the sent band and winding it around a work, and a band and band tightening mechanism sent by the band sending mechanism. A band binding machine having a band joining mechanism for thermally fusing the overlapped portion with the pulled back band, comprising: a band driving roller capable of forward / reverse drive capable of sending out the band and pulling back the band; A driven roller that is pressed against the drive roller; a setting input unit that sets a binding length around the work at a position where the band is wound; and a drive source that drives the band drive roller in the forward and reverse directions. Servomotor with, according to the binding length set in the setting input section of the band sent out A band tying machine comprising a control unit for controlling a pullback amount by a rotation driving amount of a servomotor. 2. A band sending step of sending a band along a predetermined guide path, a band tightening step of pulling back the band sent by the band sending step and winding the band around a work, and a band sent by the band sending step. A method for controlling a band tying machine, comprising: a band joining step of thermally fusing a superposed portion with a band pulled back by a band tightening step; a forward / reverse drive capable of sending out the band and pulling back the band. A band drive roller and a driven roller pressed against the band drive roller, and a drive source for driving the band drive roller in a forward / reverse direction is a servomotor with an encoder. A setting input section for setting a binding length of A method for controlling a band tying machine, characterized in that the amount of band retraction in the band tightening step is controlled by the amount of rotational drive of a servo motor in accordance with the tying length.