JPH035527Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention uses a band guide that guides the supply side end of the band, which is pinched between the jaw and the guide groove, to the band shooter when the tension arm returns to its original position. Regarding the body.

[Prior art and problems]

The conventional tension arm type packing machine is
As shown in the figure, there is a guide groove 2 provided on 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 bands on the band supply side is connected to the band shooter 6.
Inside, the upper roller 8 is held between a pair of feed rollers 8 and 9 by the force of being pressed against the main roller 9 via the eccentric shaft 5 by the weight of the weight 17, and the other is held between the feed rollers 8 and 9 as described above. The band B, which is held by the guide groove 2 and is tightened by the tension arm and protrudes from the band shooter 6, warps vertically, especially upward depending on the direction in which the band is wound on the band reel. There is a strong tendency for the band supply end to turn over and return while sagging, so that it is clamped above or below between the inlet of the band shooter 6 and the tension arm 1 (Fig. 6). Put it away. Therefore, it is impossible to feed the band to an arch (not shown) on the main body or to the outside of the main 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 forward direction in synchronization with this, and the band is fed out of the packing machine body at the same time as the tension arm returns, or the main roller 9 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 belt can be opened, closed, or connected, the supplied band will protrude from the end of the main body or the divided part of the arch, so it can only be used in general packaging machines. In the case where the band is pulled out by force, the band is held between the entrance of the band shooter 6 and the tension arm 1 (Fig. 6), and the band bent by 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.

【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 To provide a means for smoothly guiding a band to a band entrance of a band shooter.

【composition】

The structure for achieving the above object of the present invention will be explained based on the illustrated embodiment. Among a pair of feed rollers 8 and 9 that sandwich and pull back the band, one upper roller 8 is mounted on an eccentric shaft 5 and connected to the other main roller. A band guiding groove 2 is provided on the upper part of the arm which is movable towards and away from the arm, grips the band feeding end side after the pair of feed rollers 8 and 9 grips the band and pulls it back, and then slides a certain stroke and automatically returns. A tension arm 1 rotatably supports a jig 3 in the guide groove, and clamps a band between the jyo 3 and the guide groove 2 to tighten the band.
In the packaging machine, a guide faces the sliding locus of the jaw 3 of the tension arm 1 and comes into contact with the band supply side end between the band entrance 47 of the band shooter 6 and the jaw 3 of the tension arm 1. An arm 40 is provided.

[Effect]

Therefore, when the tension arm 1 is returned to its original position after being tightened, the guide arm 40 is present above the band entrance 47 of the band shooter 6 and between the jaw 3 of the tension arm 1, so that the tension arm 1 is reversed upward. In order to correct the posture of the band and send it to the band entrance of the band shooter 6, the band is inserted between both rollers 8 and 9 while lifting and rotating the upper roller 8 which is eccentrically supported by the band's own elasticity. It turns out.

【Example】

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.
They are mounted on shafts and arranged side by side. 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 an eccentric shaft bearing is provided 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 manual tightening of the tension arm/during return), the band B is held between the guide groove 2 and the jaw 3. The drag force of the spring 30 that urges the gear 3 is set smaller than the drag force of the spring 29 that connects the adjuster arm 24 and the adjuster star 25. As shown in FIGS. 1 to 4, the upper roller 8 has an eccentric shaft 5 formed at the tip of a main shaft 41 rotatably supported within a bearing case 35.
is rotatably supported via a bearing 50. Therefore, the weight 17 of the weight adjuster 4
(FIG. 6), when the eccentric shaft 5 rotates, the upper roller 8 rotates in an arc together with the main shaft 41. It will be separated from the main roller 9. The guide arm 40 has a length longer than the maximum sliding stroke of the tension arm, and is installed over the band entrance 47 of the band shooter 6. That is, a block 43 is attached to the side surface of the band shooter 6 at the band entrance 47, and the bent part of a rod having one end bent into an L-shape is rotatably inserted into the insertion hole of this block 43, and the other end is bent into an L-shape. The end is loosely inserted into the hole 45 bored in the jaw 3 of the tension arm 1. 5A to 5C show another embodiment in which the present invention is applied to a so-called horizontal packing machine, in which a guide arm 40 is formed in a U-shape, and one end is inserted into a block 43 on the back side of the tension arm 1. The guide arm 40 is fitted loosely into the guide arm 40, and the other end is placed in a position that does not interfere with the movement of the adjuster arm 24 so as to face the sliding locus of the jaw 3 of the tension arm 1.
is tilted due to its own weight until it comes into contact with a stopper formed on the block 43, and is located on the sliding locus of the jaw 3 and reaches the band entrance 47 of the band shooter 6.
and comes into contact with the band supply side end of the tension arm 1 between the jaws 3. Next, the band B is
feed rollers 8 and 9 to the outside of the main body (not shown).
When the band tip reaches the lower part of the slide table 32, the right press 33 rises and grips the band (FIG. 6). Then, the feed rollers 8 and 9 are reversed for the time set by the timer, and when the tension cam 10 is rotated clockwise in the paper of FIG. However, the adjuster arm 24 and the adjuster star 25 connected thereto by a spring 29 are also rotated by the engagement of the pin 31 of the jaw 3. The tension arm 1 continues to slide and the adjuster cam 39 connects the pin 1 protruding from the side of the adjuster 25.
When it comes into contact with 8, the adjust arm 24 stops,
The pin 31 is strongly pressed by the adjuster arm 24, but since the resistance of the spring 30 is smaller than that of the spring 29, the spring 30 that biases the jaw 3 is defeated, causing the jaw 3 to rotate clockwise via the pin 31. 3 and the bottom surface of the guide groove 2 to firmly fix the band B. 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 is tightened accordingly, and the object to be packed is to bondage. During the sliding movement of tension arm 1 tightening and returning, guide arm 40 has one end attached to block 4.
3, and the other end side moves inside the hole 45 of the jaw 3. Furthermore, by the rotating tension cam 10,
The tension arm 1 returns to the bearing case 35 side, but the guide arm 40 exists between the band entrance 47 of the band shooter 6 and the jaw 3 of the tension arm 1, and it tries to reverse upward. In order to correct the posture of the band and feed it into the band entrance 47 of the band shooter 6, the band uses its own elasticity to lift the upper roller 8, which is eccentrically supported, while rotating. It smoothly enters between the pair of feed rollers 8 and 9 in the band shooter 6. In the embodiment shown in FIG. 5, one end of the guide arm 40 rotates within the block 43 when the tension arm 1 returns, and the other end rotates at the entrance 4 of the band shooter 6.
7 is pressed by the upper bearing case 35,
During the next tightening and sliding movement, it returns to its old position as shown in A in the same figure due to its own weight. 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. Furthermore, if the guide arm is made of a flexible material or formed in the same arc shape as the sliding locus of the tension arm, it is not necessary to rotatably attach one end to the block. Furthermore, at the same time as the tension arm is tightened and slid, the jog is rotated in the direction of the guide groove, the band is held between it and 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. It is also possible to use a protrusion provided near the band entrance of the band shooter so that the jyo is brought into contact with the protrusion when the tension arm completes its return, thereby releasing the jyo.

【effect】

As described above, the present invention provides a guide arm that faces the sliding locus of the tension arm jyo and contacts the band inlet of the band shooter and the end of the band supply side between the tension arm jyo. A guide arm having a length equal to or longer than the maximum sliding stroke of the tension arm is installed above the band entrance of the band shooter, and the other end is inserted into a hole drilled in the jaw of the tension arm. With an extremely simple configuration, when the tension arm returns, the end of the band supply end is smoothly fed to the inlet of the band shooter and fed between the pair of feed rollers in the band shooter. It made it possible. Further, one end of a guide arm having a length equal to or longer than the maximum sliding stroke of the tension arm is attached above the band entrance of the band shooter, and the other end is provided with a hole bored in the jaw of the tension arm. If the ring is inserted into the ring, the entire sliding locus of the jaw will press down on the band in that area, so a greater effect can be obtained.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention.
The figure is a front view of the main part, Fig. 2 is a plan view of the main part, Fig. 3 is a partial view of the band entrance of the band shooter, Fig. 4 is an exploded perspective view of the whole, and Fig. 5 A to C are the invention of the present invention. This shows a second embodiment in which the method is applied to a horizontal packing machine, and FIG. 6 shows a conventional technique. 1... Tension arm, 4... Weight adjuster, 5... Eccentric shaft, 6... Band shooter, 41... Main shaft, 8, 9... Feed roller,
22... Arm lever, 40... Guide arm,
43...block, 44...rod, 45...hole, 47...band entrance.

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 both rollers are provided so that they can freely approach and separate via a band shooter. After pulling back the arm, grip the band supply end side, and then provide a band guide groove on the upper part of the arm that slides a certain stroke and automatically returns, and the jyo is rotatably supported in the guide groove, and the jyo and the guide are In a packaging machine having a tension arm that tightens the band by pinching the band between grooves, the band is placed between the band inlet of the band shooter and the jaw of the tension arm, facing the sliding locus of the jaw of the tension arm. A band guide for a band shooter of a packaging machine, characterized in that a guide arm is provided that comes into contact with a supply end. (2) The guide arm has a length longer than the maximum sliding stroke of the tension arm, and has one end formed above the band entrance of the band shooter and the other end formed in the hole of the tension arm. A band guide for a band shooter of a packaging machine, characterized in that the band guide is fitted into the band.