JPH07187116A - Method and device for automatic control on secondary fastening of band in packing machine - Google Patents

Abstract

PURPOSE:To automatically control the amount of fastening of a band in a secondary fastening process, and to prevent a tension motor from being overloaded while preventing breakage from occurring to the band. CONSTITUTION:In a fastening process of a packing machine that is composed of a primary fastening means that holds the front end of a band supplied to the outside of the packing machine main body and pulls back the band for winding round an article to be packed and a secondary fastening means that fastens the pulled-back band tightly round the article to be packed by rotative driving force of a tension motor 52, a reverse-turning roller 10 and a reverse-turning touch roller 13 are provided and furthermore, a detector for detecting the number of revolutions in the reverse turning that detects to discern that the number of revolutions in the reverse turning for the reverse-turning roller 10 and the reverse-turning touch roller 13 come to the preset number of revolutions in the reverse turning is provided. As the number of revolutions in the reverse turning reaches the preset number of revolutions in the reverse turning, the amount of fastening of the band in the secondary fastening process is decreased, and thereby appropriate fastening can be given automatically to articles to be packed in various types.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic control method and device for secondary tightening of a band in a packing machine.

[0002]

2. Description of the Related Art In the band tightening process of a packing machine, a band supply mechanism inside the packing machine feeds it out of the main body, and a band guide arch outside the main body or a band arranged around the object to be packed by hand is used. The tip is gripped by a press member, the mechanism for tightening the band in the main body wraps it around the object to be packed (primary tightening), and then tightens so as to tighten it (secondary tightening). Further, the amount of tightening of the band to be packed is adjusted according to the size of the packed object. For example, a large amount of tightening is required for a large object to be packed, and a necessary and sufficient amount of tightening can be performed for a small object to be packed with a small amount of tightening. The adjustment of the tightening amount is performed for each item to be packed by manually adjusting an adjustment dial or the like provided on the packing machine. Then tighten the band for the set time adjusted with the dial,
Finish the secondary tightening process.

As a tightening control means for such a secondary tightening process, the band tightening amount corresponding to a set time by a timer is used as a control reference, and as an example, Japanese Patent Publication No. 3-9004 discloses band tightening. A reverse rotation driving roller that performs (primary tightening) and a reverse rotation touch roller that slides on the reverse rotation driving roller via a band and is driven to rotate are provided.
Further, as compared with the reverse rotation driving roller, a tension roller which is driven by a tension motor at a low speed and a high torque is provided, and a tension touch roller which can be pressed into and separated from the tension roller is provided, and the reverse rotation touch roller pulls back the band (primary Tightening) The tension touch roller is pressed against the tension roller via a time band set by a timer by the detection means for detecting that the object to be wrapped is tightly tightened (secondary tightening). It is disclosed that after the set time has expired, the contact of the touch roller with the tension roller is released.

As another means for controlling the secondary tightening process, the torque applied to the band during band tightening is detected, and as in JP-A-59-199408, it rotates synchronously with the drive shaft of the tightening roller. A rotation detector for detecting the number of rotations of the magnet is provided to detect that the number of rotations of the roller has decreased to a set value or the stop has been detected when tightening of the band is completed, and an electromagnetic clutch provided between the roller and the drive source is detected. It is proposed that the power is cut off. The band tightening force in this case is obtained by the tightening torque set by the tightening set voltage of the electromagnetic clutch, and when the band is tightened to the object to be packed up to this set tightening torque, the torque of the tension motor is transmitted to the drive shaft of the tightening roller. The armature that starts to slip against the magnetic force of the rotor of the electromagnetic clutch, the rotational force of the tension motor is not transmitted to the drive shaft of the tightening roller, and the rotational speed of the magnet that rotates in synchronization with the drive shaft decreases. The electric power to the electromagnetic clutch is cut off by the detection signal of the section, and the power transmission to the drive shaft is stopped.

[0005]

The slack of the band wound around the object to be packaged in the primary tightening step varies depending on the size (outer circumference) of the object to be packaged, particularly its height. That is, when the object to be packed is small (low), there is little slack in the wound band, and when the object to be packed is large, the slack in the wound band is small. It is larger than the case of. Therefore, for a small object to be packed, the band tightening amount in the secondary tightening step may be small, and further tightening may damage the object to be packed, break the band, or cause an excessive load on the tension motor. On the other hand, on the contrary, if the amount of tightening of the band in the secondary tightening process is insufficient for a large object to be packed, it may cause loosening of the band or unpacking. Therefore, when packing, it is necessary to adjust the secondary tightening according to the size of the object to be packed.

However, in the conventional means for controlling the secondary tightening in the packing machine, the secondary tightening is performed in accordance with a preset time or a set tightening torque, so that the size of the object to be packed varies. If there is any, it is necessary to set the secondary tightening time or torque according to the size of each item to be packed. If this setting is neglected, if the object to be packed is small compared to the initial setting, the object to be packed will be tightened more than necessary (stroke), in which case the band will break or the friction resistance will increase. For this reason, the tension roller formed of resin such as urethane is worn in an extremely short time within the width of the tension touch roller by the tension touch roller that can be pressed into and out of contact with the tension roller. It may cause damage such as motor damage. Further, excessive tightening of the object to be packaged may cause the band to bite into the object to be packaged, eventually break the band, or damage the object to be packaged.

On the other hand, on the contrary, when the object to be packed is larger than the original setting, the secondary tightening of the band becomes insufficient, which causes the band to loosen or unpack. .

For example, in a device for tightening a set time band by a timer, a tension adjusting dial which is connected to the timer and which is usually arranged together with other switches (starting switch, band forward / reverse switch) on the upper surface of the packing machine is optional. For example, when the scale of the tension dial is set to "10", the band is set to be tightened by 150 mm, and when it is "4", the stroke band of 60 mm is tightened. The tightening of small objects to be packed must be completed in a short time corresponding to the short tightening amount (stroke), and the tightening of large objects requires a longer tightening time than the smaller objects. , If the band is tightened for a longer time (stroke) than required for a small package, the tension motor will be overloaded and tightening after the tightening time of the band will cause an overcurrent to flow rapidly.
Furthermore, if the band is broken more than the breaking strength of the band, the band will break, and the PP band will break into fine vertical cracks like slaps, so the broken part is cut off with a cutter and the band is packed into a packing machine. There was the trouble of having to reload it.

In addition, a device for cutting off the power supply to the electromagnetic clutch by the detection signal of the rotation detecting portion for detecting the decrease in the rotational speed of the magnet rotating in synchronization with the drive shaft of the tightening roller is necessary for a small object to be packed. When the band is tightened as described above, similarly to the former device, an excessive current suddenly flows through the tension motor, and the band is broken when the band is tightened more than the breaking strength of the band. That is, when the band is tightened with an unnecessarily tightening force on the object to be packed, the tension applied to the band causes the tightening roller to rotate at a low speed and the detection signal from the detection unit cuts off the power supply to the electromagnetic clutch. The band breaks due to the rotational inertia force of the tension motor for a short period of time after the rotation of the motor becomes low until the electromagnetic clutch is de-energized. For example, usually 70-
Packing is performed with a tightening force of 80 kgf set, but for a hard object to be packed, the rotational inertia of the tension motor causes a sudden 130 kgf.
Will reach the tightening force. The time it takes for the electromagnetic clutch to be de-energized does not vary depending on the size of the item to be packed.When a high torque load is applied for the same time, it is smaller than for a large item to be packed. When the item to be packed is packed, the load applied to the item to be packed, the band, the tension roller, and the tension motor becomes excessive.

Therefore, the secondary tightening time or the torque required for the secondary tightening must be manually adjusted according to the size of the article to be packed, which is complicated. In particular, when packing articles to be packed having different sizes, it is necessary to carry out such adjustment for each packing, and the work cannot be endured.

Further, in the unmanned automatic packing line, there is a disadvantage that only the objects of the same size have to be packed.

Further, the one in which the electromagnetic clutch is incorporated on the secondary side (output side) on the tension roller side is effective in torque control, but requires a large capacity electromagnetic clutch, resulting in high parts cost. . Further, the electromagnetic clutch incorporated in the primary tension side (input side) requires a small capacity of the electromagnetic clutch, but is not suitable for torque control.

If only the height of the article to be packed is to be detected, it is conceivable to install photocells of different heights facing the arch of the packing machine, but in addition to requiring a large number of phototubes,
It cannot be adjusted steplessly, and the cost is extremely high.

The present invention was developed in order to solve the above-mentioned problems, and it is not necessary to adjust the band tightening amount in the secondary tightening process for each item to be packed, which results in damage to the item to be packed. An object of the present invention is to provide an automatic control method and device for secondary tightening of a band in a packing machine, which makes it possible to prevent overload of a tension motor and breakage of the band.

[0015]

In order to achieve the above object, in the method and device for controlling the secondary tightening of the band in the packing machine of the present invention, the size of the object to be packed, that is, the outer circumference is determined by the primary tightening step. It is possible to measure the amount of band that has been pulled back, and the amount of band that is pulled back in the primary tightening process is the length of time until the band placed through the band guide arch etc. is wound around the object to be packed. Therefore, it is inversely proportional to the outer circumference of the object to be packed. Therefore, it is necessary to measure the band pullback amount in the primary tightening process and automatically adjust the band tightening amount in the secondary tightening process in accordance with the pullback amount. Measure the size of the item to be packed from the length of the band pulled back in the process,
In order to automatically adjust the tightening amount of the band in the secondary tightening process according to the measured size of the item to be packed, grasp the tip of the band supplied to the outside of the main body, pull back this band and wind it around the item to be packed. In the primary tightening step, the pulled back band is tightened on the object to be packed, and the secondary tightening step is performed to tighten the band, and the packing method of gripping the supply end of the tightened band and adhering the band overlapping portion, It is characterized in that the band tightening amount in the secondary tightening process is controlled corresponding to the band pulling back amount in the primary tightening process for each packaged item.

The method of controlling the secondary tightening of the band in the packing machine according to the present invention includes a primary tightening step of gripping the tip of the band supplied to the outside of the main body, pulling back the band, and winding the band around the object to be packed. In the secondary tightening process of tightening the pulled back band on the object to be packed and tightening it, and the packing method of gripping the supply end of this tightened band and adhering the band overlapping part, the primary It is also possible to perform linear control so as to reduce the band tightening amount in the secondary tightening process in response to the increase in the band pulling back amount in the tightening process.

Further, a primary tightening step of gripping the end of the band supplied to the outside of the main body, pulling back this band and winding it around the object to be packed, and tightening the pulled back band to the object to be packed, and tightening. In the secondary tightening step and the packing method of adhering the band overlapping portion by grasping the supply end of the tightened band, in the detection means for detecting that the amount of the band pulled back by the primary tightening step reaches the set value. It is also possible to control the secondary tightening amount of the band by controlling the band tightening amount by the detection signal.

In addition, the band pullback amount in the primary tightening step is detected and output as the number of rotations of the reverse rotation touch roller that slides in contact with the reverse rotation roller in the relevant step as the number of pulses. It is also possible to detect as the number of pulses having an arbitrary setting up to the maximum, and to perform the secondary tightening process at the tightening amount from the maximum to the minimum for each set time corresponding to the detected number of pulses.

The secondary tightening control device for the band in the packing machine according to the present invention holds the tip of the band supplied to the outside of the main body, pulls the band back and winds it around the object to be packed. In the packing machine, which comprises tightening the pulled-back band on the object to be packed, a secondary tightening means for tightening, and a band bonding means for gripping the supply end of the tightened band and bonding the band overlapping portion, It is characterized by comprising a detection means for detecting the band pullback amount by the primary tightening means, and a control means for controlling the band tightening amount of the secondary tightening means in accordance with the band pullback amount by the detection means.

Further, a reverse rotation roller and a reverse rotation touch roller which is in sliding contact with the reverse rotation roller are provided as the primary tightening means, and a detection means for detecting the number of rotations of the reverse rotation touch roller as a detection means for detecting the band pullback amount. It is also possible to provide a means for detecting an arbitrary set number of rotations of the reverse rotation touch roller and activating the secondary tightening means for each set time corresponding to the detected number of rotations.

[0021]

In the method and apparatus for controlling the secondary tightening of the band configured as described above, the band is pulled back in the primary tightening step, and the band is wound around the object to be packed, so that the band around the object to be packed is wound. The turned band pullback amount is detected, and the band tightening amount in the secondary tightening process is automatically adjusted according to the band pullback amount in the primary tightening process.

[0022]

EXAMPLES Examples will be described with reference to the drawings.
In FIG. 1, the band shooter forming the band passage is
The return shooter 1 includes a return shooter 1, a tension shooter 59, and a feed shooter 30.
A reverse rotation roller 10 forming a return roller facing the inner band passage 41a and rotating in the band pullback action direction, and a reverse rotation touch roller 13 as a touch roller which is slidably contacted with the reverse rotation roller 10 and driven to rotate are provided so as to be capable of pressure contact and separation.

The drive shaft 11 of the reverse rotation roller 10 has its shaft end protruding to the back surface of the substrate 5, and a pulley 12a for a flat belt is wedged to the shaft end of the drive shaft 11 as shown in FIG. , A known band gripper, a heater (not shown), and a pulley 12 provided on an input shaft of a camshaft speed reducer 44 that drives a camshaft 4 that operates a center press and the like.
The flat belt 14 is wound around b, and the reverse rotation roller 10 is constantly rotating. The input shaft is connected to a motor (not shown) on the right side of FIG. 2 via a belt 43, and the rotation of the cam shaft 4 is controlled by a cam shaft electromagnetic clutch provided on the input shaft.

The reverse rotation touch roller 13 has an eccentric shaft 86.
U is attached to the rear end of the shaft 86 and one end of the operating rod 90 is fixed by a bolt, and the other end of the operating rod 90 is provided on the connecting piece 95.
The connection piece 95 is loosely fitted in the character-shaped groove portion 92, and the connecting piece 95 is connected to the operating rod 90 by the split pin 96. Then, the upper end of the interlocking rod 91 is screwed to the lower end of the connecting piece 95, and the arm rod 9 is attached to the lower end of the interlocking rod 91.
8, one end of which is connected, and a substantially center of the arm rod 98 is rotatably provided on a bracket 99 below the substrate 5 at a fulcrum 97.
Solenoid 87 having the other end of 8 provided on the bracket 99
It is connected to the tip of the rod 88 of. The lower end of the interlocking rod 91 is urged via a spring 94 in a direction in which the reverse rotation touch roller 13 is always separated from the reverse rotation roller 10. A compression spring may be built in the connecting piece 95, or the operating rod 90 and the interlocking rod 91 may be connected by a tension spring.

1 and 2, the reverse rotation touch roller 13
In this case, a sensed portion 29, which is a notched semi-circular pulse generating portion, is projectingly formed integrally with this, and the notch 4 of the sensed portion 29 is formed.
Rotational speed detection means 4 serving as a pulse generator facing the rotation locus of 0
3 is attached. The rotation speed detecting means 43 can be selected as appropriate, such as a photo sensor or a magnetic sensor, but in the embodiment, it is a kind of proximity sensor, and the notch 40 passes between the high frequency transmitting portion and the receiving portion of the rotation speed detecting means 43. Then, one pulse is generated when it is turned on, and the capacitors connected to the one pulse are discharged, and when a portion other than the cutout portion 40 of the detected part 29 passes between the transmitting part and the receiving part, one pulse is generated when it is turned off. The capacitor is charged. When the interval of generation of each pulse of the rotation speed detecting means 43 becomes long, the charge amount of the capacitor exceeds the capacity due to the turning off of the rotation speed detecting means 43, and an electronic circuit is configured to generate a signal. A signal from the means 43 turns on a solenoid 87 that brings the touch roller into contact with and separates from the drive roller for tightening the band, which will be described later. Then, the generation timing of the signal is arbitrarily adjusted by changing the capacitance of the capacitor.

Further, in the electronic circuit, a preset reverse rotation speed subtracted from the maximum reverse rotation speed of the reverse rotation roller as a pulse number is calculated separately from the rotation speed decrease detection signal generating circuit by the condenser. Remembered here,
The maximum number of reverse rotation pulses corresponding to the maximum number of reverse rotations is the number of pulses corresponding to the number of rotations of reverse rotation required to wind the band pulled back by the reverse rotation roller around the tip of the slide table and tighten the slide table. Yes, and is calculated by the following formula.

Maximum reverse rotation speed = (total length of band guide arch-total outer length of slide table) / reverse rotation roller outer peripheral length Therefore, since the detected portion has a semicircular arc shape, one pulse is half rotation and the maximum reverse rotation pulse number is , Twice the maximum reverse rotation speed.

As an example, the band guide arch has a total length of 2460 mm; A slide table outer shape total length (one side is 50 mm, thickness is 5 m).
m is a rectangular cross section) = 110 mm; B The diameter of the reversing roller is 30 mm 2πr = peripheral length 94.2 mm; C Therefore, (A−B) /C≈24.9; maximum reverse rotating speed 24.9 × 2 ≈49.9; Maximum number of reverse rotation pulses Then, as the number of reverse rotation pulses to be set, 24.4 (first set pulse number), 46.4 (second set pulse number), 49.4 (third set pulse number) are set. Set. Therefore, the first, second, and third set rotational speeds corresponding to the first, second, and third set pulse numbers are, respectively, the first set rotational speed = 24.4 / 2 = 12.2 the second set rotational speed. Number = 46.4 / 2 = 23.2 Third rotation speed setting = 49.4 / 2 = 24.7. Then, when each set pulse number is detected, the band tightening amount in the secondary tightening step is reduced according to the reduction rate that is input in advance corresponding to each set pulse number.

Therefore, for example, when the tension dial is set to "4" and the tension stroke is set to 60 mm, when the reverse rotation pulse number is 0 to 24.0, 1
100% to 25% linearly between 24.4 and 46.4 without adjusting the tension dial.
Reduced to 15 mm, and increased from 46.4 to 49.4 to 25
%, And when the number of pulses is counted until it reaches 49.4, it is set to 0%, that is, a release signal for releasing the tightening process without turning on the solenoid 55 described later is set. That is, when the number of pulses reaches 49.4, the tightening step is omitted and the cam shaft 4 is immediately rotated to shift to the cutting and welding of the band supply end in the next step.

FIG. 7 is a graph showing the relationship between the number of pulses and the band tightening amount in the secondary tightening process.

Here, it is assumed that the width is 220 mm and the height is 480 mm.
It is assumed that the item (A) to be packed is packed. In this case, the length of the band that is pulled back by the primary tightening of the object to be packed (A) is 2460 mm-1400 mm = 1060 mm. Therefore, the number of pulses obtained by such pullback is 1060 mm ÷ 94.2 mm = 11.3; reverse rotation speed 11.3 × 2 = 22.6; reverse rotation pulse number, so the tightening amount of 100% (the above-mentioned example At 60m
m; the same applies hereinafter), and secondary tightening is performed (see Fig. 7).

On the other hand, when the object (B) to be packed having a width of 220 mm and a height of 150 mm is packed, the length of the band to be pulled back by the primary tightening of the object to be packed (B) is 2460 mm-1040 mm = 1420 mm. is there. Therefore, the number of pulses obtained by the primary tightening of the object to be packed (B) is 1420 mm / 94.2 mm = 15.0; reverse rotation speed 15.0 x 2 = 30.0; By the formula [Formula 1] y = ax + b; y = secondary tightening amount (%) x = reverse rotation pulse number 100 (%) = 24.4 (pulse) a + b 25 (%) = 46.4 (pulse) a + b −75 = 22a a = -75 / 22 = -3.4 b = 25-46.4a = 25 + (46.4 * 75) /22=183.2 y = -3.4x + 183.2 x = 30 (pulse) y = −3.4 × 30 + 183.2 = 81.2 (%) Therefore, for the object to be packed (B), about 81.2% of the object to be packed (A), or about 48.7 mm tightening. Secondary tightening is performed by stroke.

When the object (C) to be packed having a width of 200 mm and a height of 150 mm is packed, the length of the band to be pulled back by the primary tightening of the object to be packed (C) is 2460 mm-70.
0 mm = 1760 mm. Therefore, the number of pulses obtained by the primary tightening of the object to be packed (C) is 1760 mm ÷ 94.2 mm = 18.68; reverse rotation speed 24.4 × 2 = 48.8; According to the above [Formula 1], the secondary tightening is performed on the packaged item (C) with a tightening amount of 56% of that of the packaged item (A) (see FIG. 7).

Further, when the object (D) to be packed having a width of 100 mm and a height of 35 mm is packed, the length of the band that is pulled back by the primary tightening of the object to be packed (D) is 2460 mm-270 mm = 2190 mm. Therefore, the number of pulses obtained by the primary tightening of the packaged product (D) is 2190 mm ÷ 94.2 mm = 23.24; the reverse rotation speed 23.24 × 2 = 46.49; For item (D), the tightening amount is 25%.

When the object to be packed with the number of pulses reaching 49.4 pulses is packed, the secondary tightening step is omitted and the cam shaft 4 is immediately rotated to cut or weld the band supply end in the next step. Make a transition.

The amount of tightening can be reduced by changing the time during which the tension touch roller is in sliding contact with the tension roller via the band. For example, when the amount of tightening is 100%, the contact is made. Time is 0.3
48 seconds, in the case of 25%, the timer is OF at 0.087 seconds
The tightening amount can be adjusted by outputting the F signal.

In the above embodiment, the case where a plurality of set reverse rotation speeds are set has been described, but it is also possible to set only a single reverse rotation speed without setting a plurality of set reverse rotation speeds.

As described above, the band tightening amount in the secondary tightening process is automatically adjusted according to the band amount pulled back in the primary tightening process.

The drive mechanism of the tension roller will be described below. A pulley 67b is provided coaxially with the pulley 12b via another tension roller electromagnetic clutch provided on the input shaft of the camshaft speed reducer 44. The tension roller 51, which constitutes a return roller, is rotationally driven by connecting the pulley 67a via a V-belt 68 and a pulley 67a wedged to the rear end of the drive shaft 22 of the tension reducer 52 (FIG. 2).

The tension roller 51 is a large-diameter roller in which an elastic body 53 having a large frictional resistance such as urethane is attached to the outer circumference of a metal roller. The tension roller 51 is a touch roller that slides on and rotates following the tension roller 51. The roller 54 is provided so as to be freely pressed and separated.

In FIG. 3, reference numeral 6 denotes a notch hole, which is provided on the substrate 5 and is formed so that the tension roller 51 can be inserted from the back surface of the substrate 5, and the tension reducer 52 can be mounted on the back surface of the substrate 5. It was done like this.

As shown in FIG. 1, the tension touch roller 54 is attached to a shaft 58 of an arm rod 57 whose one end is rotatably connected to the substrate 5 by a shaft 66, and the other end of the arm rod 57 is a solenoid 55. The outer periphery of the tension touch roller 54 can be pressed and separated from the outer periphery of the tension roller 51 by connecting to the tip of the rod 56 and expanding and contracting the rod 56.

The tension shooter 59 is formed by providing a part of the outer circumference of the tension roller 51 with a band passage 41b that forms a band passage allowance gap, one end of which is the rear end of the return shooter 1 and the other end of which is formed as described above. The lower end of the tension shooter 59 is engaged with the arm rod 57 by the pins 60, 60 so as to face a part of the outer circumference of the tension touch roller 54, and is provided so as to be movable up and down in conjunction with the sliding movement of the arm rod 57. ing.

Further, the tension shooter 59 is provided with a long hole 61 which is a vertically long guide groove, and a guide pin 62 protruding from a reinforcing plate 63 attached to the surface of the substrate 5 is fitted into the long hole 61. To do. The tension shooter 59 is guided by a guide pin 62 and moves in the up-down direction in conjunction with the swinging movement of the arm rod 57 due to the expansion and contraction of the rod 56 of the solenoid 55. That is, the arm rod 57 is normally located at the lower side of the plane of FIG. 1 by abutting the tip of the stopper 64 provided on the bracket 65 as shown by the solid line in FIG.
Have separated from.

The tension shooter 59, which is interlocked with the swinging movement of the arm rod 57, is at the position shown by the solid line in the drawing of FIG. 1, and the upper end edge of the band exit of the band passage 41b between the tension shooter 59 and the tension roller 51 is the return shooter 1. The lower end of the band inlet of the band passage 41a (the opening in the rear of the band supply direction: the same applies below) is located below the upper edge of the band, and the tip of the supply band is the band outlet of the band passage 41b (the opening in the front of the band supply direction: the same below) More band passage 41
It is formed so as to be smoothly and reliably fed into the band inlet of a.

When the solenoid 55 is excited and the rod 56 moves the arm rod 57 upward in the plane of FIG. 1, the tension touch roller 54 presses the tension roller 51 to pull back the band, and the tension shooter 59 moves the arm rod. 57, so that one end of the band passage 41b of the tension shooter 59 moves above the band inlet at the rear end of the band passage 41a of the return shooter 1 as shown by the chain double-dashed line in FIG. The band outlet of the passage 41b is formed to be larger than the band inlet of the band passage 41a of the return shooter 1.

In FIG. 1, a feed roller 20 is supported by the drive shaft 23 on the substrate 5.
The band exit of the pool box faces a part of the outer circumference. A feed touch roller 21, which is a touch roller that is in sliding contact with the feed roller 20 and is driven to rotate, is provided so that it can be pressed and separated.

The drive shaft 23 of the feed roller 20 has its shaft end projecting to the back surface of the substrate 5, and as shown in FIG. 2, a pulley 12c for a flat belt is wedged to the shaft end of the drive shaft 23. Is the pulley 12 of the reversing roller 10 described above.
The flat belt 14 wound around a is wound around the pulley 12a.
It is rotationally driven in the same direction as that, that is, in the band supply action direction.

The feed touch roller 21 is supported by the tip of an eccentric shaft 24, and the rear end of the shaft 24 has an L-shaped operating rod 2.
5 Around the central bent portion is fixed with a bolt, and one end of the operating rod 25 is urged by a spring 26 so as to rotate the feed touch roller 21 in a direction in which the feed touch roller 21 is pressed against the feed roller 20. The end is connected to the tip of the rod 28 of the solenoid 27. While the solenoid 27 is excited, the feed touch roller 2 is resisted against the spring 26.
1 is separated from the feed roller 20, and when the excitation is released, the rod 28 causes the operating rod 25 to move the eccentric shaft 24 to the feed touch roller 2 by the urging force of the spring 26.
1 rotates in the direction in which it comes into pressure contact with the feed roller 20.

Reference numeral 41c is a band passage, which is composed of a feed shooter 30 which connects the gap between the feed roller 20 and the feed touch roller 21 and the gap between the tension roller 51 and the tension touch roller 54.

As shown in FIGS. 4 and 5, this feed shooter 30 has a curved fixed guide plate 15 integrally formed in an L-shaped cross section on the surface of a mounting plate 151 attached to the surface of the substrate 5. And a curved movable guide plate 16 that faces the fixed guide plate 15 with a band passing allowable gap therebetween.

The fixed guide plate 15 has one end facing a part of the outer circumference of the feed roller 20 and the other end facing a part of the outer circumference of the tension touch roller 54.
It is fixed to.

As shown in FIG. 6, the movable guide plate 16 includes a guide plate support fitting 161 having a bent piece 162 provided on a plate having an L-shaped cross section, and the bent piece 1
It is integrally formed by spot welding through 62, and an insertion hole 163 through which the tip of the eccentric shaft 24 of the feed touch roller 21 is inserted is provided in one piece of the L-shaped section of the guide plate support fitting 161 to further form a guide groove. An elongated hole 164 is provided. The width of the long hole 164 is provided so that the stepped portion 153 at the tip of the guide pin 152 protruding from the surface of the mounting plate 151 of the fixed guide plate 15 can be inserted.

The tip of the band pulled out from the band coil of the band reel attached to the main body of the packing machine is inserted between the feed roller 20 and the feed touch roller 21 from the outlet of the band passage of the pool box. Here, when the forward rotation switch is turned on, the pulley 12a of the reverse rotation roller 10 and the feed roller 2 are passed through the constantly rotating flat belt 14.
The 0 pulley 12c rotates in the same direction. At this time, the excitation of the solenoid 87 is released, and the reverse rotation touch roller 1
3, the eccentric shaft 86 is rotated by the urging force of the spring 94 via the interlocking rod 91, the connecting piece 95, and the operating rod 90, and is separated from the reverse rotation roller 10.

On the other hand, in the feed touch roller 21, the excitation of the solenoid 27 is released when the forward rotation switch is turned on, and the eccentric shaft 24 is rotated through the actuating rod 25 by the urging force of the spring 26 to come into pressure contact with the feed roller 20. .

Therefore, in FIG. 1, the tip of the band is driven by pressure contact between the feed roller 20 and the feed touch roller 21 and is fed to the feed shooter 30 forming the band passage 41c between the fixed guide plate 15 and the movable guide plate 16. To be done. At this time, in the movable guide plate 16, the guide plate support fitting 161 is moved to the position indicated by the solid line on the right side of FIGS. 4 and 5 by the eccentric shaft 24 of the feed touch roller 21 and the elongated hole 164 of the guide plate support fitting 161 is moved. The inner wall space of the band passage 41c, which is formed between the fixed guide plate 15 and the movable guide plate 16 and is guided by the stepped portion 153 at the tip of the guide pin 152, is narrow in parallel to the band passage allowable gap as close as possible. Has been formed.

In FIGS. 1 and 3, the solenoid 55 is not excited yet, so the arm rod 57 contacts the lower stopper 64, the tension touch roller 54 is separated from the tension roller 51, and the tension shooter 59 is It is located at the position indicated by the solid line in the lower part of FIG. Therefore, the tip of the band fed between the feed roller 20 and the feed touch roller 21 passes through the feed shooter 30 forming the band passage 41c between the fixed guide plate 15 and the movable guide plate 16 and passes through the tension roller 51 and the tension touch roller. It passes through the entrance of the band passing path 41b of the tension shooter 59 through the gap 54, and is smoothly and surely fed from the exit of the band passing path 41b into the band passing path 41a of the return shooter 1 and the reverse rotation roller 10 and the reverse rotation touch. It reaches between the rollers 13.

The tip of the band passes between the reversing roller 10 and the reversing touch roller 13 and is fed by a timer to the outside of the unillustrated packing machine main body or the band guide arch on the main body by a timer. The band tip reaches the band welding mechanism 50 around the object to be packed, and the solenoid 27 is excited by the signal for the expiration of the set time of the timer to separate the feed touch roller 21 from the feed roller 20 (FIG. 2). The band loading is completed as described above.

Next, when the start switch is turned on, the cam shaft electromagnetic clutch provided on the input shaft of the cam shaft 4 is actuated, the cam shaft 4 is rotated, and the band tip gripping mechanism of the band welding mechanism 50 causes the band tip to move. To be gripped. At the same time, the solenoid 87 is excited by a detection signal from a detection means for detecting the grip of the end of a band (not shown), and the rod 88 of the solenoid 87 resists the urging force of the spring 94 and the arm rod 98.
By rotating the eccentric shaft 86 via the interlocking rod 91, the split pin 96, and the operating rod 90, and the reverse rotation touch roller 13 is pressed against the reverse rotation roller 10.

Band passing path 41a of the return shooter 1
The inner side of the band supply end is a pair of rollers 10 which are rotationally driven.
It is pulled back at high speed by 13 (primary tightening). At this time, the detected part 29 provided on the reverse rotation touch roller 13 rotates in accordance with the reverse rotation of the reverse rotation touch roller 13, and the rotation speed detection means 43 adjacent to the detected part is provided on the detected part 29. The passage of the notch is detected and transmitted as a pulse signal to the electronic circuit. Then, the band that is pulled back travels while smoothly sliding on the inner peripheral surface of the outer wall in the band passage 41b of the tension shooter 59.

When the band escapes from the arch and is wound around the object to be packed, the rotation speed of the reverse rotation touch roller 13 decreases,
The solenoid 55 is excited by a signal that detects this, and the arm rod 57 is rotated counterclockwise in the plane of FIG.
The tension touch roller 54 on the roller 8 is pressed against the tension roller 51. The tension roller electromagnetic clutch (not shown) is activated by the signal, and the tension roller 51 is rotated at a low speed and a high torque via the tension speed reducer 52.

The pulley 67b provided coaxially with the pulley 12b is rotating through the V belt 68 wound around the pulley 67a wedged at the rear end of the drive shaft 22 of the tension reducer 52. Since the pulley 67b is rotated via the tension roller electromagnetic clutch provided coaxially, the tension roller 51 is rotated via the V belt 68 and the pulley 67a (FIG. 2).

The excitation of the solenoid 87 is released momentarily after the excitation of the solenoid 55, the reverse rotation touch roller 13 is separated from the reverse rotation roller 10, and the band is the tension roller 5.
The elastic body 53 having a large frictional resistance is wound around the peripheral surface of the elastic body 53 and is tightened (secondary tightening).

As described above, the pressing of the tension touch roller 54 against the tension roller 51 is performed for a short time when the number of pulses obtained from the reverse rotation speed of the reverse rotation touch roller 13 is large, and for a long time when the number of pulses is small. Thus, the pressure contact time is automatically adjusted. Therefore, when the number of pulses is large, that is, when the object to be packed is small, a small amount of tightening is performed for a short time. Conversely, when the number of pulses is small, that is, when the object to be packed is large, it is long time. A large amount of tightening is performed, so that the object to be packed is not tightened more than necessary, and damage to the object to be packed and excessive load on the band, tension roller and tension motor are prevented. It can be prevented.

Further, at this time, the solenoid 27 is excited, the eccentric shaft 24 rotates counterclockwise in FIG. 4, and the feed touch roller 21 moves the feed roller 20.
Since it is separated from the band, the band pulled back by the tension touch roller 54 that is in pressure contact with the tension roller 51 passes through the band passage 41c and is pulled back into the pool box.

A band is strongly applied to the object to be packed until a signal for detecting a decrease in the number of rotations of the reverse rotation touch roller 13 is input and a set time expiration signal of a timer that operates according to the number of reverse rotations of the reverse rotation touch roller 13 is generated. It is wound, and the tightening is completed when the set time of the timer has expired.
The electromagnetic clutch for the tension roller of 7b is released,
The camshaft electromagnetic clutch of the camshaft 4 is actuated again, the camshaft 4 rotates, the band supply end side is gripped, and the solenoid 55
Is released, the arm rod 57 returns to its original position,
The pressure contact between the tension touch roller 54 and the tension roller 51 is released, and the cam shaft 4 that continues to rotate further finishes the known steps of welding the band overlapping portion by the band welding mechanism 50 and cutting the supply end side to the old position. Return. By the detection signal of the end of this process, the cam shaft electromagnetic clutch of the cam shaft 4 is disengaged, the excitation of the solenoid 27 is released, the feed touch roller 21 is pressed against the feed roller 20 via the band by the spring 26, and the timer is activated. A band of a predetermined length is supplied to the band guide arch on the upper surface of the main body, and when the set time of the timer expires, the solenoid 27 is excited again and the feed touch roller 21 is fed by the feed roller 2.
It separates from 0, and one process of packing is completed. After that, the same steps as described above are performed.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment, and in the above-mentioned prior art, the rotation of the magnet rotating synchronously with the drive shaft of the reverse rotation roller. In the device that cuts off the power supply to the electromagnetic clutch by the detection signal of the rotation detection unit that detects the decrease in the number, the signal corresponding to the set pulse number may be the signal for controlling the operation time of the electromagnetic clutch.

[0068]

Since the present invention is constructed as described above, it has the following effects.

By controlling the band tightening amount in the secondary tightening step in accordance with the band pullback amount in the primary tightening step for each object to be packed, even if objects of different sizes are packed, There is no need to manually adjust the amount of secondary tightening for each item to be packed, and an appropriate amount of secondary tightening is performed for each item to be packed.

Further, it is possible to perform the secondary tightening control without applying an excessive load to the tension roller and the tension motor and applying an excessive load to the article to be packed.

Further, for each packaged object, linear control is performed so as to decrease the band tightening amount in the secondary tightening process in response to the increase in the band pulling back amount in the primary tightening process, thereby making it possible to package objects of different sizes. Even if multiple items are packed in succession, the secondary tightening is performed with the tightening amount that corresponds to the size of each item to be packed, and the tightening amount that best fits the size of each item to be packed is automatically Secondary tightening can be performed.

At the same time, it was possible to control the secondary tightening without applying an excessive load to the tension roller and the tension motor, and without applying an excessive load to the article to be packed.

Further, by controlling the band tightening amount by the detection signal of the detection means for detecting that the band amount pulled back in the primary tightening step has reached the set value, the above-mentioned secondary tightening is performed by a relatively simple method. The automatic control of quantity could be performed.

In addition, the band withdrawal amount in the primary tightening step is detected and output as the number of rotations of the reverse rotation touch roller that slides in contact with the reverse rotation roller in that step as the number of pulses, and this number of pulses is determined from the minimum in the primary tightening step. The reverse rotation is detected by detecting the number of pulses that can be set arbitrarily up to the maximum and controlling the secondary tightening process at the tightening amount from the maximum to the minimum for each set time corresponding to the detected number of pulses. When the number of pulses obtained from the reverse rotation speed of the touch roller is large, that is, when the object to be packed is small, a small amount of tightening can be performed in a short time. Conversely, when the number of pulses is small, that is, the object to be packed is large. In the case of a long time,
Since a large amount of tightening can be performed, it is possible to automatically adjust the secondary tightening according to the size of the object to be packed, without imposing an excessive load on the tension roller and tension motor, and even on the object to be packed. It was possible to automatically control the secondary tightening without applying an excessive load.

Further, by providing a detecting means for detecting the band pullback amount by the primary tightening means and a control means for controlling the band tightening amount of the secondary tightening means in correspondence with the band pullback amount by this detecting means, It is not necessary to manually adjust the secondary tightening amount for each package, and it can be used in an unmanned packaging line, and an excessive load is applied to the tension roller, tension motor, and the item to be packaged. Since this can be prevented, the tension roller and the tension motor can be prevented from being consumed,
Further, it is possible to provide a secondary tightening control device capable of preventing the occurrence of defective packing such as the band biting into the object to be packed.

Further, a reverse rotation roller and a reverse rotation touch roller that rotates in sliding contact with the reverse rotation roller are provided as primary tightening means, and detection means for detecting the number of rotations of the reverse rotation touch roller is provided as detection means for detecting the band pullback amount. And a means for activating the secondary tightening means for each set time corresponding to the detected rotation speed by detecting an arbitrary set rotation speed of the rotation speed of the reverse rotation touch roller. A secondary tightening control device capable of controlling the secondary tightening can be provided.

[Brief description of drawings]

FIG. 1 shows a front view of an embodiment of the device of the invention.

FIG. 2 shows a rear view of an embodiment of the device of the invention.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is an enlarged view of a main part of FIG.

5 is a sectional view taken along line EE of FIG.

FIG. 6 is a perspective view of a guide plate.

FIG. 7 is a graph showing the setting correspondence relationship between the number of pulses and the amount of secondary tightening in the automatic adjustment of secondary tightening.

[Explanation of symbols]

 1 Return Shooter 4 Cam Shaft 5 Substrate 10 Reverse Rotation Roller (Return Roller) 11 Drive Shaft 12a, 12b, 12c Pulley 13 Reverse Rotation Touch Roller 14 Flat Belt 15 Fixed Guide Plate 16 Movable Guide Plate 20 Feed Roller 21 Feed Touch Roller 22, 23 Drive Shaft 24 Eccentric Shaft 25 Actuating Rod 26 Spring 27 Solenoid 28 Rod 29 Detected Part 30 Feed Shooter 31 Feed Roller 32 Feed Shaft 33 Return Roller 34 Return Shaft 35a, 35b Touch Roller 36 Touch Roller 37 Tension Shooter 38 Feed Shooter 39 Return Shooter 40 Notch parts 41a, 41b, 41c Band passing path 42 Guide shooter 43 Rotation speed detecting means 44 Cam shaft speed reducer 50 Band welding machine 51 Tension Roller (Return Roller) 52 Tension Reducer 53 Elastic Body 54 Tension Touch Roller 55 Solenoid 56 Rod 57 Arm Rod 58 Shaft 59 Tension Shooter 60 Pin 61 Long Hole 62 Guide Pin 63 Reinforcement Plate 64 Stopper 65 Bracket 66 Shaft 67a, 67b Pulley 68 V-belt 86 Eccentric shaft 87 Solenoid 88 Rod 90 Actuating rod 91 Interlocking rod 92 U-shaped groove 94 Spring 95 Connecting piece 96 Split pin 97 Support point 98 Arm rod 99 Bracket 151 Mounting plate 152 Guide pin 153 Stepped portion 161 Guide Plate support bracket 162 Bending piece 163 Insert hole 164 Long hole

Claims (6)

[Claims] 1. A primary tightening step of gripping a tip of a band supplied to the outside of the main body, pulling back the band and winding the band around the object to be packed, and tightening the pulled back band to the object to be packed.
In the tightening secondary tightening process and the packing method in which the tightened band supply end is gripped and the band overlap portion is bonded, the secondary tightening is performed for each item to be packed according to the band pullback amount in the primary tightening process. An automatic control method for secondary tightening of a band in a packing machine, which comprises controlling an amount of tightening of a band in a process. 2. Holding the band tip supplied to the outside of the main body,
The primary tightening process of pulling back this band and winding it around the item to be packed, the secondary tightening process of tightening this band that has been pulled back to the item to be packed and tightening it, and grasping the supply end of this tightened band. In the packing method for adhering the band overlapping part with each other, linear control is performed so that the band tightening amount in the secondary tightening process is reduced for each item to be packed in response to the increase in the band pulling back amount in the primary tightening process. Automatic control method for secondary tightening of band in packing machine. 3. A primary tightening step of gripping the tip of the band supplied to the outside of the main body, pulling back the band and winding the band around the object to be packed, and tightening the pulled back band to the object to be packed.
Detecting that the amount of bands pulled back by the primary tightening process has reached the set value in the secondary tightening process of tightening and the packing method of gripping the supply end of this tightened band and adhering the band overlapping part An automatic control method for secondary tightening of a band in a packing machine, wherein the tightening amount of the band is controlled by a detection signal of the means. 4. The band pullback amount in the primary tightening step is detected and output as the number of revolutions of the reverse rotation touch roller that slides in contact with the reverse rotation roller in the relevant step as the number of pulses, and the number of pulses is from the minimum to the maximum in the primary tightening step. It is characterized in that the secondary tightening process is performed at a tightening amount from the maximum to the minimum for each set time corresponding to the detected number of pulses during the period up to Automatic control method for secondary tightening of band in packing machine. 5. A primary tightening means for gripping the tip of the band supplied to the outside of the main body, pulling back the band and winding the band around the object to be packed, and tightening the pulled back band to the object to be packed.
A packing machine comprising a secondary tightening means for tightening and a band adhering means for adhering a band overlapping portion by gripping a supply end of the tightened band, a detecting means for detecting a band pullback amount by the primary tightening means, An automatic control device for secondary tightening of a band in a packing machine, comprising: a control unit that controls the amount of tightening of the band of the secondary tightening unit in accordance with the amount of pulling back of the band by the detection unit. 6. The primary tightening means includes a reverse rotation roller and a reverse rotation touch roller that rotates in sliding contact with the reverse rotation roller, and the detection means for detecting the band pullback amount detects the rotation speed of the reverse rotation touch roller. 6. The packing machine according to claim 5, further comprising a detection unit, which detects an arbitrary set rotation speed of the rotation speed of the reverse rotation touch roller and operates the secondary tightening means for each set time corresponding to the detected rotation speed. Automatic control device for secondary tightening of bands.