JPH0444921A - Band feeding device of packing machine - Google Patents

Abstract

PURPOSE:To prevent nipping or jamming for a band from being generated by a method wherein pressing of a normal rotation touch roller to a forward rotation driving roller is released by a detecting signal of a band tip reaching detecting means which is provided between a sliding table and the fourth corner of a band guiding arch. CONSTITUTION:At an optional position between a sliding table 8 and the fourth corner Z of a band guiding arch 70, a band tip reaching detecting means is provided. Under a band passage under a right band-way 63, an operation piece of a limit switch is made to exist, and passing of a band tip is detected when the band tip presses the said operation piece. When a starting switch is turned ON, a forward rotation touch roller 13 is pressed to a forward rotation driving roller 10. A band is fed in the band guiding arch 70. A forward rotation driving relay is turned OFF, and the relay is cut OFF. The normal rotation touch roller 13 separates from the forward rotation driving roller 10, and the band feeding motion is stopped. Therefore, the band is not fed unnecessarily, and nipping or jamming does not generate in the band guiding arch 70, and the band is loaded under a favorable condition in the band guiding arch.

Description

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

The present invention relates to a band supply device for an automatic packing machine in which a band guide arch is attached to the main body of the packing machine, and more particularly, to a band feed device that prevents the band fed into the band guide arch from being jammed or jammed. .

[Conventional technology]

As shown in FIG. 6 (Al-(C)), the band feeding/tightening device in a conventional packaging machine uses a drive roller 1 of a pair of rollers 10 and 13 that pinch and feed the band.
A touch roller 13, which is one of the idle rollers that slides into contact with 0 through a band and rotates as a driven roller, is eccentrically supported on an eccentric shaft 6 that projects from one end of the main shaft 9, and is inserted into the other end of the main shaft 9. The touch roller 13 is rotated by rotating the main shaft 9 by the weight of the weight 7 inserted into one end of the fixed adjuster 3 or by the tension of a spring (not shown) that biases one end of the adjuster 3 downward in FIG. The eccentric shaft 6 is rotated in an arc shape 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. be. In this way, the band is held between the pair of rollers 10 and 13 using only the weight of the weight 7, the fixed position of the weight 7 on the adjuster 3, or the resistance of a spring (not shown). The band is rotated in the normal direction in the band feeding direction to feed the band into the band guide arch outside the packing machine main body. Then, by adjusting the normal 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. The slide table switch activates a braking mechanism such as an electromagnetic brake when the tip of the band reaches a predetermined position to start pulling back, that is, above the left press, right press (not shown), or at the end of the time it should reach. The roller 10 is configured to stop rotating. 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 will continue 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. The touch roller 13 is moved by 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 spring (not shown) so that the roller 13 stops and the drive roller 10 slips (idles) with respect to the band. The pressing force on the drive roller 10 is! It is arranged (
Jikko No. 53-44635). Furthermore, the present applicant has developed a packaging machine in which a band guide arch is attached to the main body as shown in FIG. A rotating 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 for detecting the arrival of the front end of the band at a predetermined stop position, and means for detecting a decrease in the number of rotations including stopping of the normal rotation touch roller and generating a signal 30, 32.
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. Discloses a band supply device for releasing the band (Japanese Patent Application Laid-Open No. 63-31
See Publication No. 7404. In this device, if the tip of the band, which is given running force 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 rotation of the touch roller 13 slows down and finally stops. This normal rotation touch roller 13
Normal rotation drive roller 1
Regardless of the zero rotation, the touch roller 54 is immediately pressed against the reverse rotation drive roller 51, the band is pulled back for a set period of time, and then the pressure contact of the touch roller is released, and the normal rotation drive roller 10 and the normal rotation are again applied to the band. touch roller 1
A running force of 3 is applied and the band is sent.

[Issues to be solved by the invention][] In the case of the former case of the packing machine exemplified in [Prior Art], in the band feeding device of a conventional packing machine, even if the tip of the band reaches the bottom of the slide table 8, Due to the fast feeding speed of the band and the rotational nature of the forward rotation drive roller 10, the band may wave within the band guide arch 70 and eventually fold over itself, resulting in a so-called nilaping situation. . Particularly in the case of weak, narrow, and soft bands that are in high demand from a cost standpoint, kneeling within the band guide arch 70 frequently occurs. If a jam occurs in the band, in which the band is folded into many layers, even if the machine is stopped and the band is manually pulled back, the bending tendency cannot be resolved. In addition, in the latter case, good results have been obtained in order to prevent the band fed into the band guide arch 70 from being jammed or jammed, but the normal rotation touch roller 13 is stopped. There is a problem in that devices such as means for detecting a decrease in rotational speed and generating a signal are complicated and are accordingly expensive. The present invention was developed in order to solve the above-mentioned problems, and includes a band feeder to prevent the band fed to the band guide arch 70 from being jammed or jammed. is intended to provide.

[Means for Solving Wlil] In order to achieve the above object, in the band feeding device of the present invention, a normal rotation drive for band feeding is provided in a packaging machine in which a band guide arch 70 is attached to the main body 61. roller 1
A normal rotation touch roller 13 is provided which can be freely pressed against and separated from the normal rotation drive roller 10 of No. 0 and No. A band tip arrival detection means for detecting that the tip of the band fed into the band has passed a predetermined position or reached the predetermined position is provided at an arbitrary point between the slide table 8 and the fourth corner of the band guide arch 70. A release means is provided at a position for releasing the normal rotation touch roller 13 from being pressed against the normal rotation drive roller 10 in response to a detection signal from the band tip reaching a predetermined position detection means. In another band supply device of the present invention, in a packaging machine having a band guide arch 70 attached to the main body, a normal rotation drive roller 10 for band supply and a pressure contact with this normal rotation drive roller 10 via a band are provided. A removable normal rotation touch roller 13 is provided, and a timer is provided that operates when the normal rotation touch roller 13 starts pressure contact with the normal rotation drive roller 1G,
The tip of the band fed into the arch reaches the fourth position of the slide table 8 and the band guide arch 70 during the set time of the timer.
The time taken to pass or reach a predetermined position between the normal rotation drive roller 10 and the corner 2 is set as the time, and a release means is provided for releasing the pressure contact of the normal rotation touch roller 13 to the normal rotation drive roller 10 after this predetermined time has elapsed. Further, in each of the band supply devices described above, in order to release the pressure contact of the normal rotation touch roller 13 to the normal rotation drive roller 10, the normal rotation touch roller 13 is eccentrically supported, and the upper end of the interlocking rod 69 is mounted on the eccentric shaft 24. At the same time, the lower end of the interlocking rod 69 is connected to the solenoid 43, and the solenoid 4
It can be used as a release means that releases by the operation of 3. Furthermore, as a similar release means, the normal rotation touch roller 13
is supported on an eccentric shaft 24, the upper end of an interlocking rod 69 is connected to the eccentric shaft 24, the lower end of the interlocking rod 69 is connected to an arm rod 46, and one end of the arm rod 46 is rotatably supported on the machine frame. and the other end,
It is provided in contact with a cam 103 attached to the camshaft 4 that operates the band feeding, gripping, cutting, and welding mechanism, and the rotation of the cam 103 releases the normal rotation touch roller 13 from being pressed against the normal rotation drive roller 10. can do. [Operation] The signal detects the completion of band welding and cutting by rotating the cam shaft 4 to which the cam 103 is attached, which operates each part of the mechanism that grips the band tip, welds the band overlapping part, and cuts the band supply end. , the camshaft 4 stops rotating, and then, due to the operation of the solenoid 43 or the cam 102 attached to the camshaft 4, the eccentric shaft rotates via the interlocking rods 69 and 91, which are interlocked with each other, and the normal rotation touch roller 13 is rotated. is pressed against the rotating normal rotation drive roller 10 via the band, and the band is fed into the band guide arch 70 so that the tip of the band meets the slide table 8 and the fourth corner 2 of the band guide arch 70. When the limit switch LSII, which is the means for detecting the arrival of the band tip provided between the two, is pressed, the limit switch LS11 generates a signal, and the release means is actuated by the signal, and the normal rotation drive roller 1 of the normal rotation touch roller 13 is activated.
0 is released, and the operation of feeding the band stops. When the release means is based on the operation of the solenoid 43, the solenoid 43 is turned off by the signal from the limit switch LSII, and the eccentric shaft rotates via the interlocking rod connected to the solenoid 43, causing the touch roller 13 to rotate normally. The state of pressure contact with the normal rotation drive roller 10 is released. In addition, when the release means is based on the operation of the cam 102, the cam shaft 4 is rotated by the signal of the limit switch LSII, so the cam 102 is rotated, and the interlocking rod connected to the other end of the arm rod is rotated by the rotation of the cam 1020. The eccentric shaft rotates through the contact, and the state in which the normal rotation touch roller 13 is pressed against the normal rotation drive roller 10 is released. In addition, the band has a timer T1 in the band guide arch 70.
1, when the band tip reaches a predetermined position between the slide table 8 and the fourth corner 2, the set time of the timer Tll expires, and at this time, the solenoid 43 or cam serving as the release means expires. The operation 102 releases the normal rotation touch roller 13 from being pressed against the normal rotation drive roller 10 . However, due to the rotational inertia of both rollers 10 and 13, the tip of the band reaches below the slide table 8 and stops. Therefore, the band can be loaded into the band guide arch 70 in good condition without causing jamming or jamming within the band guide arch 70.

【Example】

The first embodiment will be described with reference to the drawings. In FIG. 1(A), left and right bandways 62, 6 of the main body 61 are
3 Approximately in the center, known band supply, tightening, adhesion,
Each cutting mechanism is provided, and a slide table 8 that can move forward and backward and has a limit switch (not shown) on the bottom surface for detecting the arrival of the band tip is provided on the surface of the main body as desired, and a normal rotation drive for band supply. A normal rotation touch roller 13 that slides in sliding contact with the roller 10 and the normal rotation drive roller 1G via a band and rotates as a driven member, and a reverse rotation drive roller 20 for pulling back and tightening the band, and a driven roller that slides in contact with this rotation drive roller 20 via a band. A reverse rotation touch roller 23 is provided, and the normal rotation touch roller 13 is locked to a solenoid 43 via an interlocking rod 69. Also, band guide arch 70
is provided on the upper surface of the main body 61 in a downward substantially U-shape. The corners of the band guide arch 70 are defined as a first corner W1, a second corner x1, a third corner Y, and a fourth corner 2 from the band supply end side, respectively. An arch band f73 is arranged over the entire length of the arch cover 72 constituting the band guide arch 70 so as to surround the object to be packed placed on the main body 61. Moreover, over substantially the entire length of the arch bandway 73,
Power is distributed to the arch flap 74 so as to form a band passage path through a band passage allowable gap. In FIG. 1(B), reference numeral 1 denotes a band shooter, and facing the band shooter 1, the forward rotation driving roller 10 and the reverse rotation driving roller 20 are arranged at a predetermined interval. Install a pulley that cannot be shown, ■
Connect to the motor with a belt. Further, a gear is provided on the front side of the pulley of the drive shaft, and this gear is meshed with a gear provided on the shaft of the reverse drive roller 2o so that both rollers rotate in opposite directions. It is supported by a shaft via a one-way clutch and is rotatable only in the tightening action direction. 13.23 are forward and reverse touch rollers, each of which is supported on an eccentric shaft 17.24. The forward rotation touch roller 13 and the reverse rotation drive roller 10 and the reverse rotation touch roller 23 constitute two pairs of rollers, one for normal rotation and one for reverse rotation, respectively. The operating fitting 40 is attached to the tip of the eccentric shaft 17 of the normal rotation touch roller 13, and the eccentric shaft 17 is attached to the operating fitting 40 by providing a protrusion 40 and a protrusion 40b which are opposed to each other in the middle position. The upper end of a normal rotation spring 42 is rotatably attached to the protrusion 40m that applies pressure to the
The lower end of the normal rotation spring 42 is connected to a solenoid 43. Furthermore, a spring 44 is attached to the protrusion 40b of the actuation fitting 40.
is locked, and the normal rotation touch roller 13 is always urged to be released from the normal rotation drive roller 10. Therefore, the operation of the solenoid 43 is configured to function as a release means for releasing the normal rotation touch roller 13 from being pressed against the normal rotation drive roller 10. Furthermore, a protrusion 41 is provided at the tip of the eccentric shaft 24 of the reversing touch roller 23.
Attach the operating fitting 41 provided with m, and insert the protrusion 41 plow into the eccentric hole of the eccentric roller 25 so as to be rotatable.
is rotatably fitted into the roller holder 28, a reversing spring 27 is attached to the lower end of the roller holder 28, and the lower end of the reversing spring 27 is attached to the tip of an arm rod 46 having a trochanter 45. One end of the arm rod 46 is rotatably supported on a shaft protruding from the base, and a spring is engaged with the other end to bias the arm rod 46 in the direction of the band shooter 1. Incidentally, cams 102 and 103 are mounted on a shaft extending from a cam shaft 4 that operates known gripping mechanisms 38 and 39 for the band tip and supply end, as well as welding and cutting mechanisms (not shown). The cam 103 is configured to come into contact with the trochanter 45 of the arm rod 46 and operate in conjunction with the reversing spring 27 and the so-called operating fitting 41. The camshaft 4 is rotationally driven by a speed reducer that is linked to a motor (not shown). In FIG. 1(B), 8 indicates a slide table, 36 a stopper, and 37 a band guide. Further, a band tip end arrival detection means is provided at an arbitrary position between the slide table 8 and the fourth corner 2 of the band guide arch 70. For example, as shown in FIG. 1(B), a limit switch L is placed below the band passing path of the right bandway 63.
The operating piece of the SII is faced and the tip of the band is pressed against the operating piece to detect that the band tip has passed. Note that as the band destination #l arrival detection means, other switches such as a proximity sensor can be used instead of the limit switch LSII. The pulley, which rotates in conjunction with a motor (not shown) via a V-belt, rotates the drive shaft, gear, and normal rotation drive roller 10 in a counterclockwise direction on the paper of FIG. 1(B). Therefore, the gear meshing with the gear rotates the reverse rotation drive roller 20 in the clockwise direction on the plane of the drawing (B). However, since the solenoid 43 is not energized, the forward rotation drive roller 10 and the forward rotation touch roller 13 are always urged to open by the spring 44, while the reverse rotation drive roller 20 and the reverse rotation touch roller 23
Since the convex portion of the cam 103 is not in a position to push down the trochanter 45, there is a gap that exceeds the thickness of at least one band, and the band inside the band shooter 1 is not affected. In order to feed the band into the band guide arch 70, when the start switch Pa1l is turned on, the start signal turns on the relay All connected in series to it, and the reset button P
B12. [P-142-1
41] becomes conductive, self-holding of relay All works, and the a contact A11a2 of relay A11 and the b contact LS of limit switch LSII on the bottom surface of slide table 71 are connected.
The circuit [P→143→144] becomes conductive through 11b,
The forward rotation drive relay connected in series to the b contacts LSl and lb of limit switch LSII operates, and the forward rotation drive relay A
The circuit [P → 145] becomes conductive through the a contact A13m1 of I3, and the a contact A13m1 of the forward rotation drive relay A13
The relay SQL of the solenoid 43 connected in series to the
The actuating fitting 40 is pushed down through the normal rotation drive roller 10 to press the normal rotation touch roller 13 to the normal rotation driving roller 10, and the band is fed into the band guide arch 70, and the band tip is connected to the slide table 8 and the band guide arch. Since the limit switch LSII installed at an arbitrary position between the fourth corner 2 of The a contact A13m1 is turned OFF, so the relay SQL is turned OFF, and the normal rotation touch roller 13 is separated from the normal rotation drive roller 10, and the band feeding operation is stopped, but due to the inertia of the band feeding speed, The tip of the band reaches the stopper 36 under the slide table 8 and stops. Therefore, the band is loaded into the band guide arch in a good condition without being fed more than necessary (without causing jamming or jamming in the band guide arch 70). Contact 145
By interposing a timer 714 shown in the IC circuit described later in the circuit so that the relay SQL is ON only for a predetermined start waiting time, even if the band gets jammed in the arch or some other force that inhibits the band running is applied. Even if the normal rotation of the band is stopped after the timer 714 hours, it is possible to avoid a situation where the normal rotation drive roller 10 continues to rotate. Of course, while this timer T14 is operating, the tip of the band will reach the limit switch LS.
Needless to say, when II is pushed in, the normal rotation of the band stops at the same time. On the other hand, when the tip of the band is pushed into the actuating piece of limit switch LSII,
Contact LS11a turns ON, the reverse drive relay connected in series to it operates, and the a contact A12 of the reverse drive relay
The circuit of [P → 143 → 146 becomes conductive through A1, and the relay A14 connected in series to this operates, which causes a limit switch LSI2 (described later) which gives a so-called reversal signal to tighten the band around the object to be packaged. b of
Contact LS12b and A contact A14m1 of relay A14
Through this, the circuit [P-143-147-148] becomes conductive, and the self-holding of relay A14 works. Therefore relay A
The circuit [P→143→1
49→160J is connected to the power supply, and the clutch C11 connected in series with it is ON, the rotation of the motor is transmitted to the camshaft 4, the camshaft 4 rotates, and the presser foot 38 (gripping mechanism)
rises and grasps the tip of the band. During this period, the limit switch LS1 is provided so as to come into contact with the cam fitted on the camshaft 4, which continues to rotate.
2 pushes in and the limit switch LS12 b contact LS
12b is OFF and relay A14 is OFF, so a
Since contact A14a2 is OFF, the turn a[143→149→
150] is rendered non-conductive, the clutch C1l connected in series therewith is turned off, and the rotation of the camshaft 4 is stopped. When the limit switch LS12 is pushed in, the cam 103 on the camshaft also rotates, so the actuating metal fitting 41 is pushed down via the trochanter 46, arm rod 46, reversing spring 27, roller receiver 28, and eccentric roller 26, and the eccentric shaft 24 The reversing touch roller 2 rotates in an arc shape and is supported by the eccentric shaft 24.
3 is pushed down and pressed against the reversing roller 20. Therefore, the band is pulled back and tightened by a pair of rotationally driven reversing rollers 20, 23. On the other hand, when the limit switch LS12 is pressed, the a contact LS128 of the limit switch LS12 is turned ON.
Therefore, timer T13 and timer T12 connected in series are turned on at the same time. The time of the timer T12 is set to be slightly longer than the time of the timer T13. Therefore, timer T13 and timer T
During the timer 713 hours when 12 is ON, timer T
12 a contact T128 and timer T13 b contact T1
3b is non-conductive, and the circuit [143→151] becomes non-conductive. However, after timer T13 hours until timer 712 hours, the circuit [143
-151] conducts, and relay A15 connected in series with this
works, and the b contact LS13 of limit switch LSI3
[P
→162-151] circuit becomes conductive, self-holding of relay A16 works, circuit [143-153→160] becomes conductive through A contact A16a2 of relay A15, clutch C11 is turned ON again, and the camshaft rotates. , left press 39
(gripping mechanism) rises and grips the band, and at the same time the arm rod 46 releases the trochanter 45 which had been pushed downward.
The spring 47 that always urges the
The actuating metal fitting 41 is pushed down via
It moves away from 0, and the tightening of the band ends. Therefore, the tightening of the band ends after the time set by the timer T13 has elapsed since the limit switch LS12 was pressed. Next, the bonding of the band overlapping part and the cutting of the band supply end are performed, and the limit switch LSI3, which detects the end of these series of steps by rotation of the camshaft and generates a signal, is ON, and the b contact A14bl of the relay A14 is turned on. The circuit [P→
154] conducts, relay A16 operates, and relay A12
B contact A12bl and A contact A16 of relay A16
The circuit [P → 157 → 154] becomes conductive through -1,
Self-holding of relay A16 works, therefore relay A16
The circuit [P → 145] becomes conductive through the a contact A16a2 of the solenoid 43, the relay SQL of the solenoid 43 is turned on, the band is supplied into the arch, and the tip of the band pushes the limit switch LS11 and the a contact of the limit switch LSII LSI15 turns on, [P → 143-156 circuit becomes conductive, relay A12 works, and therefore b contact A
Since 12bl is OFF, the circuit [143 and 157 becomes non-conductive, and relay A16 is OFF. Therefore, contact A16s2 of relay A16 turns OFF,
Relay SQL of solenoid 43 is turned OFF. Furthermore, when relay A16 is activated, the b contact A of relay A16
The circuit [P→142→141] becomes non-conductive via 16bl, and relay All is turned off. Therefore, the circuit [P-143] becomes non-conductive via the a contact A11a2, so the a of the limit switch L311
The circuit [143→166] via the contact LS11m and the circuit [143→144] via the b contact LS11b of the limit switch LSII are both non-conductive, and will not be activated even if the band tip in the arch presses the limit switch LSII. do not have. Next, the second embodiment will be described with reference to the drawings and the same parts as the first embodiment will be omitted. As shown in FIG. 3, the band tip arrival detection means in the first embodiment is not provided,
A timer Tll is activated when the normal rotation touch roller 16 starts pressing against the normal rotation drive roller 10. That is, in FIG. 3, the timer Tll is activated when the limit switch LS13, which generates a signal by detecting the completion of a series of packaging processes such as bonding the band overlapping portion and cutting the band supply end by rotation of the camshaft, is turned on. Circuit [P-164→N]
It is connected to the relay SQL of the solenoid 43 via the a contact T11s of the timer T11. Furthermore, the self-holding circuit of relay A11 [P-142→1
41] is connected to the b contact Tl1b of the timer Tll. Then, the set time of the timer Tll is set so that the leading end of the band fed into the band guide arch 70 is placed at a predetermined position between the slide table 8 and the fourth corner 2 of the band guide arch 70, for example, at the fourth corner 2 of the right band way 63. The time taken to pass through the same position as the installation location of the limit switch LS1m in the first embodiment is set. Therefore, when the limit switch LSI3 is ON, the circuit [P→154] is connected via the b contact A14bl of the relay A14.
is conductive and timer Tll is ON, so timer Tll
The circuit [P→145] is made conductive through the a contact Tl1a of the solenoid 43, the relay SQL of the solenoid 43 is turned ON, and the band is fed into the band guide arch 70 for the time set by the timer Tll, that is, the tip of the band is connected to the slide table. 8 and the fourth corner 2, the relay 5OLI of the solenoid 43 turns OFF, and the normal rotation touch roller 13 leaves the normal rotation drive port 10. As in the first embodiment, the band tip reaches the stopper 51 and stops due to inertia. Further, when the timer Tll is turned on, the circuit [P-142-141] becomes non-conductive through the b contact T11b of the timer Tll, and the circuit [P->143 becomes non-conductive and the starting switch is turned off, as in the first embodiment. The packaging process will not begin unless PBll is pressed to make circuit 141 conductive. Next, regarding the third* example, referring to Figures 4 and 5,
The description will be omitted while omitting the same parts as in the embodiment and the second embodiment. 1 is a band shooter, and facing the band shooter 1, a forward rotation drive roller 10 and a reverse rotation drive roller 20 are arranged at a predetermined interval. , the drive shaft 1 of the normal rotation drive roller 10
1 is directly connected to a motor 15 with a reduction gear, 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 forward rotation drive roller 10 and the reverse rotation drive roller 20 are always driven to rotate forward and reverse in opposite directions at relatively high speed and low torque, and relatively low speed and high torque, respectively. 13.23 is a forward/reverse touch roller which is an idle roller,
The structure related to both the forward and reverse rotation touch rollers will be explained with reference to FIG. 5, which has approximately 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 end of the operating rod 90, 96 is rotatably attached to the tip of the shaft 86.86.
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) to the operating rods 90, 96. The lower end of the operating rod 90 is an arm rod 9 having a trochanter 94.97.
8. Attach to the tip of 99. One end of the arm rods 9g, 99 is rotatably supported on a shaft 100 that projects from the machine base, and a spring 101° (101) is engaged with the other end to bias the band shooter 1 in the direction. 4 and 5). 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 9B, 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 hence the operating rods 9G and 9B. The cams 102 and 103 move the operating rods 90 and 96 through the interlocking rods 91 and 96 to rotate the touch rollers 13 and 2 in the forward and reverse directions.
3 is the forward rotation drive roller 10. The pressure force applied to the reversing roller 20 can be adjusted by rotating a nut 89 (89) at the bottom of the spring 93 (93) mounted on the lower end of the operating rods 90, 96. Therefore, it is variable to some extent. Then, when the band tip presses the operating piece of the limit switch LSII, which is the band tip arrival detection means of the first embodiment, a signal is generated from the limit switch LS11.
Alternatively, when the set time of the timer Tll in the second embodiment expires, the tip of the band is connected to the slide table 50 and the band guide arch 7.
0, the camshaft 4 is rotated, and the rotation of the cam 102 releases the normal rotation touch roller 13 from being pressed against the normal rotation drive roller 10. It consists of Reference numeral 51 denotes a tension roller which is a reverse drive solar tension roller for band tightening, and has a part of its circumference facing the rear end of the band shooter 1, and has a lower speed and higher torque than the normal rotation drive roller 10 and this normal rotation drive roller 10. It is configured to rotate at a lower speed and higher torque than the rotating reversing roller 20, and the reversing roller Ig! Drive shaft 22 of tension roller 51 as a moving roller
is directly connected to a tightening motor 62 consisting of a geared motor with a brake attached to the back surface of the board 6. 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. An annular member 60 made of a material with lower frictional resistance and higher hardness than the elastic body, such as a Teflon (coated) thrust washer, is embedded in the elastic body 53, and this annular member 60 is inserted from the outer periphery of the elastic body 53. For example, the mold is made to protrude by 0.2 to 0.3 wm. Reference numeral 54 designates a touch roller, which is supported on an eccentric shaft 58 and has one end connected to a rod 66 of a solenoid roller 5 to which timers T2 and T3 are connected, and the other end of a crank 57 is connected to an eccentric shaft 68.
The tension roller 51 which is connected to the tip of the touch roller 54 and is connected to the tip of the reversing part e roller by the expansion and contraction of the rod 56
It is configured so that it can be pressed into contact with and separated from the external station. 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 T2 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 T3 is set to a very short time, for example, about 1 second. . Next, the operation of the third 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), and the tip of the band has reached the bottom of the slide table 8. A cam 102 is attached to the forward rotation drive roller 10 and the forward rotation touch roller 13FN.
Since the convex portion is not in a position to press down the trochanter 94, there is a gap that exceeds at least the thickness of the band-to-edge, and the band within the band shura 1 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 rotated by the activation switch, and the band tip gripping mechanism of the band welding mechanism 50 grips the band tip. Since the cam is also rotating at the same time, the trochanter 97,
The operating rod 95 is pushed down via the arm rod 99 and the interlocking rod 96, the eccentric shaft rotates in an arc, and the reverse rotation t-troller 23 supported on the eccentric shaft is pushed down and pressed against the reverse rotation 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 reverse drive roller 20 and the reverse touch roller 23, the tension roller 51, which is a reverse drive roller, has already started rotating by the tightening motor 52. The body 53 runs while smoothly sliding on a low coefficient of friction λ annular member 60 protruding from the outer periphery. When the band escapes from the arch and is wrapped around the packaged item,
A signal to detect this (by timer or other arbitrary means)
Then, the solenoid 65 is energized, and the touch roller 54 on the eccentric shaft 58 is connected to the tension roller 5 via the crank 57.
1. At this time, the annular member 60 on the elastic body 53
In this case, the band is inserted into the elastic body 53 at a portion where both rollers, the touch roller 54 and the elastic body 53 of the tension roller 51 which is a reverse drive roller come into pressure contact with each other due to the pressure contact of the touch roller 54, and when the band is wrapped around the elastic body 53. The band is then press-fitted through the elastic member 53, and the band is tightened by the surface of the elastic body 53 which has a large frictional resistance. When the band is tightly wound around the object to be packed, the tightening end detection means (shown in the figure) detects this and issues a tightening end signal, which causes the tightening motor 62 to stop and the camshaft to stop. 4 rotates again, the band supply end side is gripped, the solenoid 55 is de-energized, and the camshaft 4 rotates and the arm rod 99
is activated, the pressure contact between the reversing touch roller 23 and the reversing roller 20 is released, and a gap is formed between each roller in the band shooter 1 to the extent that the rollers do not contact the band. The known steps of band cutting and welding, in which the mechanism 50 welds the band overlapping portion and cuts the supply end side, are completed. On the other hand, since the rotation of the camshaft 4 rotates the cam, the normal rotation drive roller 10 and the normal rotation touch roller 13 are in the state shown in FIG.
The band stops once, the band is pressed between both rollers, and the band is delivered to the upper surface of the main body. When the band tip presses the operating piece of the limit switch LS11, which is the band tip arrival detection means of the first embodiment, the limit switch LSI
The signal generated from I or the timer T of the second embodiment
When the set time ll has expired, the camshaft 4 rotates again and stops when each member returns to its original position.

【Effect of the invention】

Since the present invention is configured as described above, it produces the effects described below. Band tip arrival detection means for detecting that the tip of the band fed into the band guide arch M has passed a predetermined position or reached the predetermined position is provided between the slide table and the fourth corner of the band guide arch. Installed at any position between
Since a release means is provided for releasing the pressure contact of the normal rotation touch roller against the normal rotation drive roller in response to a detection signal from the detection means for detecting the arrival of the band tip at the predetermined position, the band fed into the band guide arch can be pressed against the band. It has been possible to provide a simple and inexpensive band feeding device that can prevent the occurrence of paper jams. Further, a timer is provided that operates when the normal rotation touch roller starts pressing against the normal rotation driving roller, and the timer is set to wait until the tip of the band fed into the arch reaches the slide table and the fourth band guide arch. The time taken to pass or reach a predetermined position between the corner and the corner is set as the time, and a release means is provided to release the normal rotation drive roller from being pressed against the normal rotation drive roller after this set time elapses, so that it has the same effect as above. We were able to provide a band supply device.

[Brief explanation of drawings]

1 to 5 show embodiments of the present invention, and FIG. 1 (A,
) is an overall perspective view of the packing machine, FIG. 1(B) is a front view of main parts, FIG. 2 is a sequence circuit diagram of the first embodiment, FIG. 3 is a sequence circuit diagram of the second embodiment, and FIG. 4 5 is a partial sectional view taken from the side of FIG. 4, and FIGS. 6 and 7 show the prior art.
A) is an overall perspective view of the band supply, tightening, and welding mechanism; FIG. 7B is a perspective view of the band supply device; FIG. 7 is an exploded perspective view of the band supply device; FIG. 1. Band shooter, 10. Forward rotation drive roller, 1.
3-Forward rotation touch roller, 15...motor with reducer, 2
0 Reverse roller, 23... Reverse touch roller, 30.
31...-rotating disk, 32.33...notch line, 34.35
...Rotation speed detection means, 61.. Reverse drive roller (tension roller l, 52.. tightening motor, 54. touch roller, 55. solenoid, patent applicant Strabac Co., Ltd.

Claims (4)

[Claims] (1) A packaging machine having a band guide arch attached to the main body, which is equipped with a normal rotation drive roller for band supply, and a normal rotation touch roller that can be freely pressed against and separated from the normal rotation drive roller via the band, and band tip reaching detection means for detecting that the tip of the band fed into the band guide arch passes through a predetermined position or reaches the predetermined position by the rotating touch roller coming into pressure contact with the normal rotation driving roller; is provided at an arbitrary position between the slide table and the fourth corner of the band guide arch, and the normal rotation touch roller is released from pressure contact with the normal rotation drive roller in response to a detection signal from the band tip reaching a predetermined position detection means. A band supply device for a packing machine, characterized in that a release means is provided. (2) A packaging machine having a band guide arch attached to the main body, which is equipped with a normal rotation drive roller for band supply, and a normal rotation touch roller that can be pressed into contact with and separated from the normal rotation drive roller via the band, and A timer is provided that operates when the touch roller starts pressing against the normal rotation drive roller, and the timer is set to set the timer until the tip of the band fed into the arch is between the slide table and the fourth corner of the band guide arch. A band feeding device for a packaging machine, characterized in that a band feeding device for a packaging machine is provided, the band supplying device being provided with a release means for releasing the pressure contact of the normal rotation touch roller to the normal rotation drive roller after the set time has elapsed. (3) The normal rotation touch roller is eccentrically supported, and the upper end of the interlocking rod is connected to the eccentric shaft, and the lower end of the interlocking rod is connected to a solenoid, and the operation of the solenoid causes the normal rotation drive roller of the normal rotation touch roller. The band feeding device for a packing machine according to claim 1 or 2, further comprising a release means for releasing the pressure contact. (4) The normal rotation touch roller is eccentrically supported, the upper end of the interlocking rod is connected to the eccentric shaft, the lower end of the interlocking rod is connected to an arm rod, and one end of the arm rod is rotatably supported on the machine frame. and the other end is provided in contact with a cam attached to a camshaft that operates the band feeding, gripping, cutting, and welding mechanism, and rotation of the cam releases the normal rotation touch roller from being pressed against the normal rotation drive roller. A band supply device in a packing machine according to claim 1 or 2, wherein the band supplying device is a release means for releasing the band.