JPS63317404A - Band supply apparatus for packing machine - Google Patents

Abstract

PURPOSE:To ensure the supply of a band under a slide table by transmitting backward motion to the band, moving a touch roller into engagement with a reversely rotatable drive roller for predetermined period of time by generating a signal for detecting a reduction in the revolution speed of the touch roller before the generation of a signs for detecting the arrival of the end of b and and by moving the touch roller put of engagement there from after the lapse of the predetermined period of time. CONSTITUTION:If the forward motion of a band is hindered due to the collision with a band guide arch or any other object existing at any place of the of the band whose motion is transmitted by a normally rotatable drive roller 10 and a normally rotatable touch roller 13, the latter roller is decreased in revolution speed and finally brought to a stop. A touch roller 54 is at once moved into engagement with a reversely rotatable drive roller 51 by a signal detecting a reduction in the revolution speed of the normally rotatable touch roller 13, independently of the rotation of the normally rotatable drive roller 10, so as to transmit backward motion to the band for a predetermined short period of time and the aforesaid touch roller is then moved out of engagement there from, whereby the normally rotatable drive roller 10 and the normally rotatable touch roller 13 transmit forward motion again to the band for resuming its travel.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a band feeding device for an automatic packing machine in which a band guide arch is attached to the main body of the packing machine.The present invention relates to a band feeding device for an automatic packing machine in which a band guide arch is attached to the main body of the packing machine. The present invention relates to a band supply device that allows the tip of the band to reach a predetermined stopping position on the lower surface of a slide table.

[Prior art and problems]

As shown in FIGS. 4(A) to 4(C), the band feeding/tightening device in a conventional packaging machine uses a drive roller 1 of a pair of rollers 1G and 13 that pinch and feed the band.
A touch roller 13, which is one of the idle rollers that slides into contact with the roller 0 through a band and rotates as a driven roller, is eccentrically supported on the main shaft 9 by an eccentric shaft 6 that projects from one end of the main shaft 9, and is inserted and fixed to the other end of the main shaft 9. The eccentric shaft of the touch roller 13 is rotated by rotating the main shaft 9 by the weight of the weight 7 pushed through one end of the adjuster 3 or by the tension of a spring (not shown) which urges one end of the adjuster 3 downward in FIG. 6 is rotated in an arc and pressed against the other drive roller 10 connected to a drive mechanism (not shown) to pinch the band and obtain the frictional force necessary to feed the band. In this way, the band is held between the pair of rollers 10 and 13 only by the weight of the weight 70, the fixed position of the weight 7 on the adjuster 3, or the resistance of a spring (not shown), and the pair of rollers 10 and 13 are held between the bands. The band is rotated forward in the sending direction to feed the band into the band guide arch outside the packing machine main body. Then, by adjusting the forward rotation time with a timer set to be slightly longer than the time for the band tip to reach the bottom of the slide table 8, or by sensing the arrival of the band tip provided below the slide table 8. When the slide table switch reaches the predetermined position for starting pullback, that is, above the left press, right press, etc. (not shown), or at the end of the time it should reach, the electromagnetic brake etc. is applied.
! The drive roller 10 is configured to operate the mechanism and stop the rotation of the drive roller 10. Incidentally, even though the band has already reached the bottom of the slide table 8 at the time of the band supply, within the set time of the timer or the time-up signal of this timer or the slide table provided below the slide table 8. The drive roller 10 continues to rotate for a short period of time until the rotation of the drive roller 10 is stopped by the braking mechanism activated by the switch signal. 13 stops and the drive roller 10 slips with respect to the band (idling) due to the weight of the weight 7 on the adjuster 3, the position of the weight 7 on the adjuster 3, or the tension of the unillustrated spring. The pressing force on the drive roller 10 is adjusted (*Kokusho 53-44635). In addition, if the band gets caught in the band guide arch when supplying the band, not only the timer that adjusts the band supply time, but also the system that stops the band supply using a slide table switch will cause a time-up problem. However, since the band does not reach the switch, the pair of rollers 10 and 13 rub against the same part of the band, and the core is scraped, locally crushed, and folded. When the band is supplied next time, it may fold over inside the arch or inside the band shooter 1, which has a notch that exposes a part of the circumference of the touch roller 13 and the drive roller 10. A condition of niraping may occur. If a jam occurs in the band, in which the band is folded into multiple layers, the bending tendency cannot be resolved even if the machine is temporarily stopped and the band is manually pulled back. Particularly in the case of stiff, narrow, soft bands that have recently been in high demand from a cost standpoint, problems such as the band tip being locked in the arch often occur.

【the purpose】

The present invention solves the above-mentioned drawbacks of the prior art and provides a band feeding device that can feed a weak band under a slide table even when the band is caught in the arch. The purpose is to

【composition】

In order to achieve the above-mentioned object, the present invention provides a packaging machine having a band guide arch attached to the main body, in which a normal rotation drive roller 10 for band supply is in sliding contact with the normal rotation drive roller 10 through a band, and driven rotation. a forward rotation touch roller 13, a reverse rotation drive roller 51 for pulling back and tightening the band, which is driven to rotate at a lower speed and higher torque than the normal rotation drive roller, and a touch roller 54 that can be pressed against and separated from the reverse rotation drive roller 51. and means 30, 32 for detecting the arrival of the band tip end at a predetermined stop position, and further detecting a decrease in the number of rotations including the stoppage of the normal rotation touch roller and generating a signal.
34, and when the rotation speed decrease detection signal is generated before the band tip arrival detection signal is generated, the touch roller 54 is pressed against the reverse rotation driving roller 51 for a set time, the band is pulled back, and after the set time has elapsed, the touch roller is pressed against the rotation speed reduction detection signal. The configuration is such that it can be canceled.

[Effect]

Therefore, if the tip of the band to which running force is applied by the normal rotation drive roller 10 and the normal rotation touch roller 13 collides with something at the band guide arch or other places and the band running force is interrupted, the normal rotation touch roller 13's rotation slows down and finally stops. In response to the signal detecting the decrease in the rotational speed of the forward rotation touch roller 13, the touch roller 54 is immediately pressed against the reverse rotation drive roller 51 regardless of the rotation of the forward rotation drive roller 10, and the band is pulled back for a set period of time. The pressure contact of the touch roller is released, and the running force of the normal rotation driving roller 10 and the normal rotation touch roller 13 is applied to the band again to feed the band.

【Example】

1 to 3 show an embodiment of the present invention, in which 1 is a band shooter, and facing the band shooter 1, a forward rotation driving roller 10 and a reverse rotation driving roller 20 are arranged at a predetermined interval. , a motor 15 with a reduction gear is directly connected to the drive shaft 11 of the normal rotation drive roller 10, and a gear 19 provided on the drive shaft 11.
meshes with a gear 26 having a larger diameter than the gear 19 provided on the shaft 21 of the reversing roller 20. Therefore, the normal rotation drive roller 10
, the reversing rollers 20 are constantly rotated forward and reverse in opposite directions at relatively high speed and low torque, and at relatively low speed and high torque, respectively. 13.23 is a forward/reverse touch roller which is an idle roller,
The configuration related to both the forward and reverse rotation touch rollers will be explained with reference to FIG. 3, which has substantially the same configuration and shows the operating mechanism of the forward rotation touch roller 13.
It is supported on an eccentric shaft 86.85, and the upper ends of operating rods 90, 95 are rotatably attached to the tip of the shaft 86.85, and
The lower ends of the operating rods 90.95 are loosely fitted into the holes 92 (92) provided in the bent pieces of the L-shaped interlocking rods 91, 96, and the springs 93. (93), it is connected to the operating rods 90, 95. The lower end of the operating rod 90 is an arm rod 9 having a trochanter 94.97.
Attach to the tip of 8,99. One end of the arm rod 98.99 is rotatably supported on a shaft 100 protruding from the machine base, and a spring 101° (101) is engaged with the other end to urge the band shooter 1 direction (first Figure and Figure 3). Reference numerals 102 and 103 denote cams, which are mounted on a shaft extending from a cam shaft 4 for operating a heater (not shown), a center press, etc., and the arm rods 98, 99.
The trochanters 94 and 97 are brought into contact with each other to operate in conjunction with the interlocking rods 91 and 96, and thus with the operating rods 90 and 95. Note that the cam 102. (102) interlocking rod 91.9
The operating rods 90 and 95 are connected to the forward and reverse rotation touch rollers 13 through 6.
, 23 as the normal rotation drive roller 10. The pressure force applied to the reversing roller 20 can be adjusted by rotating the nut 89 (89) at the bottom of the spring 93 (93), which is mounted on the lower end of the operating rod 90°95. Therefore, although it is variable to some extent, when a predetermined resistance is applied to the band that is traveling or being pulled back, the rotation speed of the forward/reverse rotation touch roller 13.23 decreases, and eventually the rotation speed of the forward/reverse rotation drive roller 10. The reverse rotation four-wheeler 20 slips against the band, and the forward and reverse rotation hitch roller 13.2
3 stops. The above-mentioned resistance is actually the resistance caused by the tip of the band sent out being caught in the arch or coming into contact with the slide table switch for the forward rotation drive roller 10 and the normal rotation touch roller 13, and for the reverse rotation drive roller 10 and the normal rotation touch roller 13. 20. With respect to the reversing touch roller 23, this is the resistance when the band escapes from the arch and is wound around the object to be packed due to this reversal. In FIGS. 1 to 3, the forward rotation touch roller 13 and the reverse rotation touch roller 23 are integrally provided with rotary discs 30 and 31, which are notched circular arc-shaped pulse generation plates, and the rotation plate 30.
Rotational speed detecting means 34 and 35, which are pulse generators, are attached facing the rotation locus of the notches m32 and m33 at 0 and 31, respectively. The rotation speed detection means 34.35 is a type of proximity sensor, and the cutouts 32, 33 are connected to the rotation speed detection means 34.35.
When the high frequency wave passes between the high frequency transmitting section and the receiving section, a pulse is generated when the signal is turned on, and the capacitors connected to the pulses are discharged, and the parts other than the notches 32 and 33 of the rotary disks 30 and 31 are connected between the transmitting section and the receiving section. When it passes through, it turns off and the capacitors are charged. The electronic circuit is configured in such a way that when the interval between pulses of the rotational speed detection means 34, 36 becomes longer, the amount of charged Ti in the capacitor exceeds the capacity due to the rotational speed detection means 34, 35 being turned off, and a signal is generated. In response to the signal from the rotational speed detection means 34, a solenoid that causes a touch roller to approach and separate from a drive roller for band tightening, which will be described later, is turned on. The generation timing of the above signal is arbitrarily adjusted by changing the capacitance of the capacitor. Reference numeral 51 denotes a tension roller which is a reverse drive roller for tightening the band, and has a part of its circumference facing the 1&end of the band shooter 1, and has a tension roller 51 that is a reverse rotation drive roller for tightening the band, and has a part of its circumference facing the 1&end of the band shooter 1.
The drive shaft 2 of the tension roller 51, which is a reversing drive roller, is configured to rotate at a lower speed and higher torque than the reversing roller 20, which rotates at a lower speed and higher torque than the rotating roller 10.
2 is directly connected to a tightening motor 52 which is a geared motor with a brake attached to the back surface of the board 5. This tension roller 51 is a large diameter roller made of a metal roller with an elastic body 53 having high frictional resistance such as urethane attached to the outer periphery.
A cut is made in the center of the outer peripheral surface of the elastic body 53 in the width direction, and the frictional resistance is lower than that of the elastic body.
And materials with high hardness, such as Teflon (coating)
An annular member 60 made of a thrust washer from the system is embedded, and this annular member 60 slightly protrudes from the outer periphery of the elastic body 53 by, for example, 0.2 to 0.3 m. Further, reference numeral 54 designates a touch roller, which is supported on an eccentric shaft 58 and has one end connected to a rod 56 of a solenoid 55 to which timers T1 and T2 are connected.
The outer periphery of the touch roller 54 is reversely driven by the expansion and contraction of the rod 56. I! It is configured so that it can be pressed into contact with and separated from the outer part of the 2-ra tensian roller 51. Reference numeral 59 denotes a guide shooter, which covers a part of the outer periphery of the tension roller 51, which is a reverse drive roller, through a band passage gap, and has one end connected to the rear end of the band shooter 1 and the other end to the outer periphery of the touch roller 54. It is installed facing a part of it. The set time of the timer T1 is set as the time necessary to further tighten the band wound around the object to be packed, and the set time of the timer T2 is set to a very short time, for example, about 1 second. . Next, the operation of the above embodiment will be described. The band is now placed around the object to be packed via a band guide arch on the packing machine main body (not shown) or manually, and the band tip has reached the bottom of the slide table 8. Since the convex part of the cam 102 is not in a position to push down the trochanter 94, there is a gap between the normal rotation driving roller 10 and the normal rotation touch roller 13, which is at least the thickness of one of the bands. band is not affected. The same holds true for the relationship between the reversing roller 20 and the reversing touch roller 23. Here, the camshaft 4 is activated by the start switch.
rotates, and the band tip is gripped by the band tip gripping mechanism of the band welding mechanism 50. Since the cam is also rotating at the same time, the trochanter is 97, the armrest is 99,
The operating rod 95 is pushed down via the interlocking rod 96, the eccentric shaft rotates in an arc, and the reversing touch roller 23 supported by the eccentric shaft is pushed down and pressed against the reversing roller 20. Therefore, the band supply end side in the band shooter 1 is pulled back at high speed by a pair of rotationally driven rollers (-next tightening). At the same time as the band is pulled back by the reversing roller 20 and the reversing touch roller 23, the tensian roller 51, which is a reversing drive roller, has already started rotating by the tightening motor 52. It runs while smoothly sliding on an annular member 60 with a low coefficient of friction that protrudes from the outer periphery of the elastic body 53. When the band escapes from the arch and is wrapped around the packaged item,
Since resistance is added to the band against this reverse movement, the reversing touch roller 23 gradually

[This rotation speed becomes slower, the rotation speed of the rotary disk 31 also decreases, the pulse generation interval by the rotation speed detection means 35 becomes longer, and the amount of charge to the capacitor decreases.
When the arbitrarily adjusted capacity is exceeded, a signal is generated, and this signal energizes the solenoid 55 via the timer T1, and the touch roller 54 on the eccentric shaft 58 is pressed against the tensian roller 51 via the crank 57. Ru. At this time, the annular member 60 on the elastic body 53 is in pressure contact with the touch roller 54 at a portion where the elastic body 53 of both rollers, the touch roller 54 and the Tensian roller 51 which is a reversing drive roller comes into pressure contact, and the band is attached to this elastic body 53. In the wrapped state, the elastic body is press-fitted into the elastic body 53 via the band, and the elastic body has a high frictional resistance! According to the phase 53, the band is tightened within the set time of the timer T1. When the set time of the timer T1 expires, the band is tightly wound around the object to be packed, and at the same time, a tightening end signal is issued, and this signal causes the tightening motor 52 to stop, and the camshaft 4 rotates again to close the band supply end. The side is gripped, the excitation of the solenoid 55 is released, the arm rod 99 vibrates due to the rotation of the camshaft 4, the pressure contact between the reversing touch roller 23 and the reversing roller 20 is released, and there is a gap between each roller in the band shooter 1. A gap is formed that does not contact the band, and the band welding mechanism 50 welds the overlapping part of the band and cuts the supply end side by the camshaft 4 which continues to rotate. Furthermore, each process of known band cutting and welding is completed. On the other hand, since the rotation of the camshaft 4 rotates the cam, the forward rotation drive roller 10 and the forward rotation touch roller 13 are in the state shown in FIG. 3, and the camshaft 4 is temporarily stopped and the band is pressed between both rollers. Then, deliver the band to the top of the main body. When the tip of the band comes into contact with the slide table switch below the slide table 8, the camshaft 4 rotates again in response to this switch signal, and stops when each member returns to its original position. During this time, resistance is added to the normal rotation of the normal rotation touch roller 13 due to the contact of the band tip with the slide table switch, the rotation speed of the normal rotation touch roller 13 decreases, and the normal rotation drive roller 10 finally touches the band. The touch roller 13 slips against the normal rotating touch roller 13 and stops. During this time, the band will not be fed redundantly, and accidents such as the band becoming clogged within the arch can be prevented. Note that due to the slip of the forward rotation driving roller 10 and the decrease in the rotation speed leading to the stop of the forward rotation touch roller 13, the pulse generation interval of the rotation speed detection means 34 becomes long (although the capacitor is discharged when the slide table switch is turned ON). , is reset. When the band is supplied by normal rotation of the normal rotation me roller 10 and the normal rotation touch roller 13, if the tip of the band gets caught somewhere inside the arch and resistance is applied to the band, the rotation of the normal rotation touch roller 13 is reset. The number of pulses decreases, the pulse generation interval becomes longer, and a signal is output via the capacitor, and this signal causes the tightening motor 52 to rotate in reverse, turning on the solenoid 55 of the touch roller 54 via the timer T2, and turning on the timer T.
2, the solenoid 55 is energized for about 1 second. The reversal ζ of the tension roller 51 by the tightening motor 52, like the reversing roller 20, has a lower speed and higher torque than the normal rotation drive roller 10, so it overcomes the normal rotation of the normal rotation drive roller 10 that is slipping with respect to the band. The band is pulled back slightly into the main body by the tension roller 51 and the touch roller 54, that is, the tip of the band that is locked in the arch is pulled back from the locking portion to the rear in the band running direction. When the timer T2 times up, the power to the tightening motor 52 and solenoid 55 is cut off, and the running force of the forward rotation drive roller 10 and the forward rotation touch roller 13, which continue to rotate, is applied to the band, and the band moves inside the arch again. Travel at high speed and reach the bottom of the slide table. The band pulling back of the tension control roller 51 and the touch roller 54 by the tightening motor 52 and the solenoid 55 is repeated when the rotation speed detection means 34 detects a decrease in the rotation speed leading to the stop of the normal rotation touch roller 13 again. When the electronic circuit is configured so that the detection signal is generated again after a predetermined number of repetitions, the rotation of the motor 15 with a speed reducer is stopped and an external (abnormality light) is displayed. In the above embodiment, the tension roller 51 is used as the reverse rotation drive roller, and the touch roller 54 is pressed against the tension roller 51 by a solenoid for a predetermined period of time to slightly pull back the band. A reversing roller 20 driven by a gear 26 and a cam 103
Regardless of this, a solenoid may be provided in the reversing touch roller 23. Also, when the solenoid is turned on, the cam 102 is rotated to release the pressure contact between the normal rotation touch roller 13 and the normal rotation roller 10, and the cam 102 is returned to its old position at the same time as the solenoid is turned off, thereby applying running force to the band again. You may also give The slide table switch is turned on by the tip of the supplied band, and when the band supply is completed, the camshaft 4
A limit cam (not shown) that operates in conjunction with the camshaft 4
The clutch that transmits the rotation of the motor through the reducer to
FF, the rotation of the camshaft 4 is stopped, and each mechanism returns to its previous position. [Effect] The present invention provides a packaging machine equipped with a band guide arch as described above. A touch roller, a reverse rotation drive roller that is driven to rotate at a lower speed and higher torque than the normal rotation drive roller, and a touch roller that can be pressed against and separated from the reverse rotation drive roller B, and a touch roller that can be moved to a predetermined stop position at the tip of the band. A means for detecting the arrival of the band is provided, and a means for detecting a decrease in the number of rotations including a stop of the normal rotation touch roller and generating a signal is provided, and a means for detecting a decrease in the number of rotations before the band tip arrival detection signal is generated. When this occurs, the touch roller is pressed against the reversing drive roller for a set time, the band is pulled back, and the touch roller is released from pressure after the set time has elapsed. When the band cannot run inside the arch, the band is pulled back slightly and sent out again at high speed, so the running posture of the tip of the band is adjusted to ensure that the band runs inside the arch and is fed below the slide table. Can be done.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a front view of the main part, FIG. 2 is a schematic view taken along the line A-A in FIG. 1, and FIG. 3 is a partial view. FIG. 4(A) to 4(C) show the prior art. FIG. 4(A) is an overall perspective view of the band supply, tightening, and welding mechanism, and FIG. 4(B) is a perspective view of the band supply device. Figure (C) is an exploded perspective view of the band supply device.

Claims (1)

[Claims] A packaging machine having a band guide arch attached to the main body includes a normal rotation drive roller for band supply, a normal rotation touch roller that slides on the normal rotation drive roller via a band and rotates as a result of the rotation, and a normal rotation drive roller that rotates as a driven roller. In contrast, the present invention is equipped with a reverse rotation drive roller that is driven to rotate in reverse at low speed and high torque, a touch roller that can be pressed against and separated from the reverse rotation drive roller, and a means for detecting when the tip of the band reaches a predetermined stop position. A means is provided for detecting a decrease in the number of rotations, including a stoppage of the forward rotation touch roller, and generating a signal, and a means for generating a signal for detecting a decrease in the number of rotations before the generation of the band tip reaching detection signal causes the touch roller to be moved to the reverse rotation drive roller. A band supply device for a packaging machine, characterized in that the band is pressed back for a set time, the band is pulled back, and after the set time elapses, the band is released from the touch roller.