JPH0311127Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention is a packaging machine equipped with a band tensioning mechanism using a tension arm, and when the tension arm returns, a gap is provided between a pair of feed rollers to tighten the band supply end. The present invention relates to a device for feeding between the pair of feed rollers in a user.

[Prior art and problems]

The conventional tension arm type packing machine has a fifth
As shown in the figure, there is a guide groove 2 provided in the upper part of the tension arm 1 and a rotatable jaw 3 in the guide groove 2.
Holding the band supply side between them, tighten the tension cam 10.
, the tension arm 1 is rotated to the right in the figure to tighten the band at a certain stroke, and the tension cam 10, which continues to rotate after the known band welding and cutting process, moves the tension arm 1 in the direction of the band shooter 6. However, when the tension arm 1 returns, one of the band feeding sides is held between a pair of feed rollers 8 and 9 in the band shooter 6, and the other side is held by a pair of feed rollers 8 and 9 as described above. Because the band B is held by the jaw 3 and the guide groove 2 as shown in FIG. and the tension arm 1 (FIG. 5). Therefore, it is impossible to feed the band to an arch (not shown) on the band body or to the outside of the band body by the pair of feed rollers 8 and 9 in preparation for the next packing. Conventionally, in order to avoid this inconvenience, when the tension arm 1 returns, the feed rollers 8 and 9 are rotated in the normal direction in synchronization with the return of the tension arm 1, and the band is fed out of the packing machine body at the same time as the main roller 9 returns. Measures have been taken, such as carving knurling in the band and forcing it to slide against and rotate using strong frictional force, and forcibly pulling out the band held in place as described above. However, these means require a control means such as a limit switch that instructs the rotation of the feed rollers 8 and 9 in synchronization with the return of the tension arm, and even if this means is adopted, the arch on the main body will not rotate or move forward or backward. If the packing machine is capable of opening, closing, or connecting, for example, it can only be used in general packaging machines because the supplied band would jump out from the end of the main body or the divided part of the arch. If the band is pulled out forcibly, the band is held between the entrance of the band shooter 6 and the tension arm 1 (Fig. 5), and the band bent at almost 180 degrees is directly inserted into the arch. As the band is being fed, accidents such as the band getting jammed in the arch and poor adhesion have occurred. Therefore, as shown in FIG. 6, the applicant has already proposed, in Utility Model Publication No. 58-42248, a pair of feed rollers 8 and 9 that grip the band supply end side in the band supply side direction of a pair of feed rollers 8 and 9 that clamp and pull back the band. It has a tension arm 1 which is moved by a tension cam 10 in a fixed stroke to tighten the band, and one of the pair of feed rollers 8 and 9 is mounted on an eccentric shaft 5 and is provided so as to be able to move toward and away from the other roller 9. One end of the interlocking rod 16 is brought into contact with the weight adjuster 4, which has a weight 17 inserted through it at the rear and the front end inserted into and fixed to the main shaft of the eccentric shaft 5 of the feed roller 8, and the other end is connected to the crank 14. One end is pivotally supported on the machine frame 15, and the rotor 13 at the other end is brought into contact with a cam 12 formed on the cam shaft 11 of the tension cam 10, so that when the tension arm 1 returns, it is placed between the pair of feed rollers. We proposed a device that forms a gap. This device also solves the problems of the prior art described above, but the cam 12 to the camshaft 11 can be
The drawback was that it required processing, making manufacturing somewhat complicated.

【the purpose】

The present invention was developed to improve such conventional drawbacks, and has an extremely simple configuration. By providing a gap between the pair of feed rollers when the tension arm returns, the band supply end side end An object of the present invention is to provide a device that smoothly feeds a portion of the feed between a pair of feed rollers in a band shooter.

【composition】

The structure for achieving the above object of the present invention will be explained based on the illustrated embodiment. One of the pair of feed rollers 8 and 9 that clamps and pulls back the band, for example, the upper roller 8, is mounted on an eccentric shaft 5 and the other main roller is mounted on an eccentric shaft 5. Both rollers are provided so as to be able to approach and separate by applying force to the roller 9, and after the pair of feed rollers 8 and 9 clamp the band and pull it back, the band is gripped at the band feeding end side, and the band is gripped between the band guide groove and the jaw 3. In a packaging machine having a tension arm 1 that slides a constant stroke to tighten the packaging machine, when the shaft 5 of the one roller, for example, the upper roller 8, rotates in the opposite direction to the tightening direction of the tension arm, The eccentric shaft 5 is supported so as to form a gap with the other roller, and
One end of the locking rod 40 is fixed to the one roller shaft 5, and the other end of the locking rod 40 is attached to the tension arm 1.
The shaft is provided so as to be rotatable by being locked at any position of the tension arm 1 during sliding movement.

[Effect]

Therefore, at the same time as the tension arm 1 slides,
Since the other end of the locking rod 40 is locked to the tension arm 1 and moves, the upper end of the locking rod 40, which is fixed to the shaft of one of the upper rollers 8 and pivotally supported, moves in the tensioning direction of the tension arm. As a result, the upper roller 8 on the eccentric shaft 5 is moved away from the other main roller 9 to form a gap between the pair of feed rollers 8 and 9. In the gap thus formed,
The band gripped between the band guide groove of the tension arm 1 which continues to slide and return to its original position is inserted between the band guide groove and the jaw, thereby allowing the band to be smoothly supplied by both of the rollers in the next step.

[Embodiments] The details of the present invention will be explained below based on the illustrated embodiments. Note that the same reference numerals are used for the same members as those used in the description of the conventional example. 15 is a tension cam 1 in the machine frame of the main body, which rotates after the band is wound around the object to be packed and the band is pulled back.
0 is axially supported, and 1 is a tension arm connected to the machine frame via a spring 21. An arm lever 22 having a trochanter at its tip, which is provided substantially orthogonally to the tension arm 1 and integrally therewith, is connected to the tension cam. It is in contact with the cam surface of 10. The resistance of this spring 21 is greater than either of the two springs described later. This tension arm 1 has its lower end supported on a main shaft 23 of a machine frame 15, and an adjuster arm 24 and an adjuster star 25 are loosely mounted on this main shaft 23, respectively.
It is mounted on a shaft and attached. Adjust arm 24
A pin 26 is provided protruding from the lower end of the adjuster star 25, and a pin 27 protruding from the circumference of the adjuster star 25 is engaged with the pin 26.
A projecting rod 28 formed integrally with the adjusting arm 24 and the spring 2 in a substantially L-shape from 5
9, so that the adjuster star 25 and the adjuster arm 24 are connected to each other, and the upper end of the adjuster arm 24 is attached in a direction opposite to the tightening direction of the tension arm 1 when the band is tightened, that is, in a counterclockwise direction in FIG. Forced. Further, a pin 18 is protruded from the side surface of the adjuster star 25, and is eccentrically supported so that the pin 18 rotates intermittently and rotates counterclockwise in FIG. An adjusting cam 39 is provided. A guide groove 2 for the band B is provided in the upper part of the tension arm 1, and the upper end of the band B is rotatably supported on the tension arm 1 and separated from the guide groove 2 by a spring 30 via a pin 31. The lower end of the jaw 3, which is biased in one direction, is faced, and this jaw 3 is in contact with the upper end of the adjuster arm 24 via the pin 31. When the jaw 3 is biased by the spring 30 and its lower end face is positioned to the right in Figure 1 (at the end of tension arm return/initial position), the band B passes between the jaw 3 and the guide groove 2. And Jiyo 3 is adjusting arm 2
When the upper end of the band B is rotated in the opposite direction (during tightening/returning of the tension arm), the band B is held between the guide groove and the jaw. The drag force of the spring 30 that biases the gear 3 is set smaller than the drag force of the spring 29 that connects the adjuster arm 24 and adjuster 25. Note that the weight adjuster 4 is different from the one explained in the conventional example. As shown in FIG. 4, one end of the spring 36 is attached to an L-shaped hook inserted into the main shaft 41 having the eccentric shaft 5 of the feed roller 8, and the other end of the spring 36 is attached to the support piece 37 in front of the bearing case 35. The tension can be freely adjusted using a nut via a bolt 38. As shown in FIGS. 1 to 3, the feed roller 8 has an eccentric shaft 5 mounted on the tip of a main shaft 41 rotatably supported within a bearing case 35.
A cap 4 is rotatably supported on the eccentric shaft 5 via a bearing 50, and a cap 4 is screwed onto the tip of the eccentric shaft 5.
2, the hole of the block 43 having a split groove is inserted and the split groove is tightened with a bolt, and this block 43 is fixed so as to be interlocked with the eccentric shaft 5. A plate 45 is attached to both sides of the block 43, and a coil is placed in the middle. The arc-shaped upper end of a locking rod 40 made of wire shaped like a spring 44 is fixed, and the lower end of the locking rod 40 is attached to an arm lever 22 integrated with the tension arm 1.
It is locked to a stopper 46 screwed into the vicinity of the trochanter 13 at the tip. Therefore, in FIG. 1, when the locking rod 40 is locked to the stopper 46 by the sliding movement of the tension arm and its lower end slides, the eccentric shaft 5 moves against the spring 36 of the weight adjuster 4 as shown in FIG. The feed roller 8 rotates clockwise in the drawing, and the feed roller 8 rotates in an arc together with the main shaft 41. Therefore, the feed roller 8, which is normally provided in sliding contact with the main roller 9 under the tension of the spring 36, is separated from the main roller 9. Next, to explain the operation, the band B is moved to the outside of the main body (not shown) by a known means, and the feed roller 8,
When the tip of the band reaches below the slide table 32, the right press 33 rises and grips the band (FIG. 5). Then, the feed rollers 8 and 9 are reversed for the time set by the timer, and when the object to be packed is wound around and the tension cam 10 is rotated clockwise perpendicular to the plane of FIG. 1, the tension arm 1 is moved to the right via the arm lever 22 The adjuster arm 24 and the adjuster star 25, which is connected to the adjuster arm 24 by a spring 29, also
It rotates due to the engagement of the pin 31 of the jaw 3. At this time, the locking rod 40 is moved simultaneously with the sliding of the tension arm 1 by the arm lever 2 integrated with the tension arm 1.
When the eccentric shaft 5 is stopped by the stopper 46 on the top of the weight adjuster 4 and moves while being bent by the coil spring 44, the eccentric shaft 5 is moved to the first position by the block 43 against the spring 36 of the weight adjuster 4.
The feed roller 8 rotates counterclockwise on the paper surface.
rotates in an arc together with the main shaft 41. Therefore, the feed roller 8 is released from sliding contact with the main roller 9, and a certain gap is formed between the outer peripheral surfaces of both rollers. Tension arm 1 continues to slide and adjust cam 3
9 comes into contact with the pin 18 protruding from the adjuster star 25, the adjuster arm 24 stops, and the pin 31
is strongly pressed by the adjuster arm 24, but since the resistance force of the spring 30 is smaller than that of the spring 29, the spring 30 which biases the jaw 3 is defeated and the jaw 3 is rotated clockwise via the pin 31. Band B is firmly fixed with the bottom surface of guide groove 2. During this time, the tension arm 1 continues to slide due to the action of the tension cam 10, so the tension arm 1 rotates through the remaining stroke regulated by the tension cam 10, and the band B
are tightened tightly, binding the items to be packed. Furthermore, by the rotating tension cam 10,
The tension arm 1 returns to the bearing case 35 side, but during this time a gap is provided between the feed rollers 8 and 9, so that the supply end of the band B is smoothly formed between the pair of feed rollers into the band shooter 6. Enter the gap. While the tension arm 1 is returning to its original position, the known steps of gripping, band bonding, and cutting by the left press 34 on the band supply side are completed. In the above embodiment, the tension arm is moved by a tension cam. However, even if the rod of an air cylinder is connected to the upper part of the tension arm and the band is always tightened with a constant force, this method is not applicable. The invention can be implemented similarly. Further, the locking rod may be a leaf spring or a whole coil spring. In addition, at the same time as the tension arm is tightened and slid, the jog is rotated in the direction of the guide groove, and the band is held between the guide groove and the tension arm is constantly tightened by the full stroke of the tension cam or air cylinder, and the band is tightened. The jaw may be released by abutting the jaw at a projection provided near the band entrance of the band shooter when the tension arm completes its return.
Furthermore, the shaft of the upper roller that fixes the locking rod is not limited to an eccentric shaft, but the same action and effect can be obtained even if it is a main shaft thereof.

【effect】

As described above, in the present invention, one end of a locking rod is fixed to the shaft of one of the rollers, and the other end of the locking rod is provided so as to be able to lock at any position on the tension arm when the tension arm is slid. , an extremely simple configuration in which a gap is formed between the pair of feed rollers when the tension arm returns; This makes it possible to smoothly feed the band to the gap formed between the pair of feed rollers in the band shooter, and to smoothly feed the band by both rollers in the next step.

[Brief explanation of the drawing]

Figures 1 to 4 show embodiments of the present invention;
The figure is a front view of the main parts, FIG. 2 is an exploded perspective view of the whole, FIG. 3 is an enlarged view of the main parts, FIG. 4 is a rear view, and FIGS. 5 and 6 show the prior art. 1...Tension arm, 4...Weight adjuster, 5...Eccentric shaft, 41...Main shaft, 8, 9...
...Feed roller, 22...Arm lever, 40
...Latching rod, 42...Cap, 43...Block, 44...Coil spring, 45...Plate, 46...Stopper.

Claims (1)

[Claims for Utility Model Registration] (1) One of a pair of feed rollers that clamps and pulls back the band is eccentrically supported, and one roller is biased against the other roller, so that both rollers can be moved toward and away from each other; In a packing machine having a tension arm that grips the band supply end side after the band is clamped and pulled back by the pair of feed rollers, and that slides a certain stroke in order to grip and tighten the band between the band guide groove and the jaw. The roller is eccentrically supported so that when the shaft of the one roller rotates in a direction opposite to the tightening direction of the tension arm, a gap is formed between the roller and the other roller, and the shaft of the one roller is engaged with the shaft of the one roller. A package characterized in that one end of a locking rod is fixed, and the other end of the locking rod is locked at an arbitrary position of the tension arm when the tension arm is slid, so that the shaft is rotatable. A device that feeds the band feed end of the machine into the band shooter. (2) A device for feeding the band feed side end of the packaging machine according to claim 1, wherein the locking rod is a coil spring or a leaf spring.