JPS6356089B2 - - Google Patents

Description

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

The present invention relates to a band guide arch provided on the body of a packaging machine.

[Technical background]

An automatic packing machine equipped with a so-called band guide arch feeds the packing band into the band guide arch by a band supply mechanism within the packing machine main body, arranges it in a loop so as to surround the object to be packed, and then wraps the band. After the leading end of the band is gripped and fixed by the band tip gripping mechanism in the main body, the band feeding end side is pulled back by the band tightening mechanism in the main body, and the band is released from the flap in the band guide arch, and the band is removed. After tightening and binding the machine to be packed, the band supply end side is gripped and fixed by the band supply end side gripping mechanism, and then the overlapping parts of the band tip side and the supply end side are welded by the band welding mechanism in the main body, and the band supply end side is The structure is such that packaging is performed by cutting near the welded part.

[Prior art and problems]

In the case of a normal general-purpose automatic packaging machine, the band guide arch is installed perpendicularly to the upper surface of the main body downward in a U-shape, and the inside includes a bandway forming a band passage path and the entire length of the bandway in the longitudinal direction. The upper surface of the main body of the bandway is covered with a gap that allows the band to pass through, and a plurality of openable and closable members are biased through the material itself or a spring so as to be closed in normal times so as to be opened when the band is pulled back. The flap is integrated with the bandway, or an arch frame to which the bandway is attached and fixed is installed, and the flap is pushed open when pulling back the band placed on the bandway from its supply end. and an arch cover arranged with an opening to form a gap in the width direction that allows the band to pass through when the band escapes from the flap, and when the band is pulled back, the flap is biased to be closed in normal times. The band pulling process, in which the band itself is pushed open, the band escapes from the flap, and the band is wound around the packing machine, is required to be performed as quickly and at high speed as possible in order to improve packing efficiency. In addition, since there is a distance between the bandway and the loop-shaped band inserted into the flap and the circumferential surface of the object to be packed, the band that escapes from the flap will meander and fall onto the object to be packed. For example, if the band is tightened due to friction with the top corner of an object whose top surface is rectangular, and the object is wrapped diagonally with the band, it will not be possible to transport the object because it is not packed at the shortest distance. Over time, the extra band becomes loose, and in the worst case, the band comes off from the packaged item, resulting in a fatal defect.
Particularly in the case of narrow bands of 5 to 6 mm, which have come into widespread use in recent years for economical reasons, the above-mentioned meandering during escape is large, and styrofoam boxes, which are often used as packaging materials, have large friction. Such packaging defects are likely to occur. Therefore, as a means to eliminate this drawback, Japanese Patent Publication No. 52-7400 discloses a series of arch guides made of flexible resin with a U-shaped cross section, as shown in FIGS. 5 and 6. 1 is curvature-deformed into a loop shape so that its both ends are exposed under the band welding mechanism, and a plurality of springs 3 are pressed against the U-shaped opening surface against the inner wall surface of the arch cover 2 to form a band passage path 4. At the same time, the entrance horizontal portion of the arch guide 1 is forcibly expanded when the band is pulled back. However, with this method, the opening surface of the flexible resin arch guide is cut at the edge of the band made of general-purpose polypropylene, polyester, etc. when the band is released, so it is not durable, and the following drawbacks and problems have been found. It was issued. First, according to the above means, as shown in FIG. 7, when the band is pulled back by the arch guide in the straight section, the band is pulled out in the lateral direction with respect to the arch guide 1. The end edge of the band B becomes stuck to the inner wall of the arch guide 1, causing a situation in which the band cannot escape from the arch guide 1 and cannot be pulled back. However, when the band is pulled back, the band inside the corner becomes tightly stuck in the direction of the arch center of the arch guide 1, that is, the inner surface of the corner, and the band is locked to the inner surface of the corner, causing the arch to tighten when the band is pulled back. Even if the horizontal portion of the guide 1 on the band entrance side was forcibly expanded, a situation occurred in which the band could not be pulled out smoothly from the arch guide 1. Then, the mechanism that tightens the band after it is pulled back has already started operating by a cam, a timer, etc., and as a result, the band is tightened without completely escaping from the arch guide 1, and the welding process that follows A problem has arisen in that the arch guide 1 itself is wrapped in a band. Second, this is particularly noticeable in thin, stiff, narrow bands and relatively inexpensive foreign-made bands, but plastic bands for packaging machines, such as polypropylene, require a manufacturing process that involves stretching or winding onto a paper core tube. Since meandering occurs in the process (left and right on a plane), the wave-like or mountain-like bending of the band as shown in FIG. A situation arises in which it is impossible to pull back. In order to avoid such a situation, if the band passage path 4 of the arch guide 1 is formed higher than the band width,
As shown in Fig. 8A and B, the band B stands up when being supplied, and when pulled back, the arch guide 1
If the band B is twisted inside, the band will not be able to escape and be unable to be pulled back. If the arch guide is further made higher, the band will stand upright when the band is supplied, and will eventually turn over within the arch guide 1. Third, if the width of the arch guide is made wider in an attempt to absorb the meandering of the band, it becomes even more difficult for the band to escape.

【the purpose】

The present invention was developed to correct the drawbacks of the prior art described above, and it absorbs the meandering of the band, and when pulling the band back, the band is reliably and smoothly pulled out sequentially from the corner of the arch guide, and the band is pulled out from the arch guide. To provide a band guide arch capable of reliably running inside the band.

【composition】

The configuration of the present invention for achieving the above object will be explained based on FIGS. 1, 2, and 3 corresponding to the embodiment.
In a band guide arch for a packaging machine, in which the arch guides 20 forming the arch guide 20 are molded in a series and both ends thereof face the band welding mechanism S, each corner portion W, X, Y, Z of the arch guide 20 is formed on the inner wall surface. The arch cover 1 is formed from two sides that have a horizontally oriented substantially L-shaped cross section, and one piece 22 in the direction of the center of the arch is attached to the arch cover 1.
The guide plate 16 is formed to be inclined toward the center of the arch so as to form an acute angle with respect to the guide plate 16 formed by the inner wall surface of the guide plate 1, and a piece 21 in the direction opposite to the center of the arch is formed to contact the guide plate at a substantially right angle. In addition, the arch guide 20 is characterized in that the portions other than the corner portions are formed into a substantially U-shaped cross section, and the opening surface of the arch guide faces the guide plate 16 in a covered manner. Therefore, the band fed into the arch guide 20 runs along the inner surface of the piece 21 in the direction opposite to the arch center of the arch guide 20, and is pulled back to the arch center of the first corner W of the arch guide 20. It moves in the direction of the opening 23 along the inclined surface of one piece 22 in the direction, and sequentially pushes out the arch guide 20 from the second to fourth corners X→Y→Z, and escapes from the arch guide 20. Even if the escaping band B is meandering, the arch guide 20 has one piece 22 in the direction of the arch center at the corner portion that is inclined toward the center of the arch, so the band escapes from the corner portion one by one. The edge of the band does not get caught inside the arch guide 20, and can escape from the arch guide 20 extremely smoothly.

【Example】

Hereinafter, details of the present invention will be explained based on drawings showing embodiments. In Figs. 1 to 4, the main body of the packing machine is equipped with a band reel wrapped with packing bands and houses various mechanisms necessary for packing, such as a known band supply, tightening mechanism, and welding mechanism S. Band guide arch 1
An arch cover 11 that constitutes 0 is provided astride the arch cover 11. The arch cover 11 is made up of a pair of front and rear L-shaped cross-sectional frame bodies and a U-shaped frame body, which are butted against each other, and are fixed vertically onto the packaging machine main body. In addition, an arch guide 2 is provided inside the arch cover 11.
0 is set. The entire arch guide 20 has a substantially downward C-shape with straight lines other than the corner portions W to Z, and one end thereof faces the band welding mechanism S when supplying the band and forms a linear portion EN on the band entrance side. , the other end faces the band tip gripping mechanism G of the band welding mechanism S and forms an outlet-side linear portion EX of the band. As shown in FIGS. 2 and 3, the arch guide 20 has inner walls of the first to fourth corner portions W to Z whose cross sections are substantially horizontally curved, and straight portions other than the corner portions W to Z. has a U-shaped cross section and a series of openings 23.
an inner peripheral piece 22 forming a piece in the direction of the center of the arch, each of which has a linear and smooth inner surface;
and an outer circumferential piece 21 forming a piece in the opposite direction from the center of the arch, which are integrally molded in series.The outer circumferential piece 21 at each corner portion W to Z has an inner surface substantially perpendicular to the guide plate 16, and an inner circumference. The piece 22 faces the opening 23 and is a guide plate 16 whose inner surface is inclined toward the center of the arch and formed by the inner wall surface of the arch cover 11.
A band passage path 2 is formed at an acute angle to the U-shaped straight portion and is approximately 1.5 to 6 times wider than the band width depending on the band width used (for example, 4.5 to 19 mm).
form 4. The inner width of the arch guide at the fourth corner Z-side straight portion EX near the band welding mechanism S is slightly narrower than other portions depending on the band width or due to the guide body (not shown). The arch guide 20 has a pair of rods 1
2 and 12 within the arch cover 11, and under normal conditions, due to its own weight, a series of openings 23 faces the guide plate 16 formed by the inner wall surface of the arch cover 11. In other words, both rods 1
Brackets 14 and 1 have bent portions at the lower ends of brackets 14 and 12 fixed to the back side of the left and right straight portions of the arch guide 20.
A bracket 1 is rotatably fitted into the hole 4, and has a bent portion at the other end protruding from the inner wall of the arch cover 11 above the upper corner portions X and Y of the arch guide 20.
It is rotatably inserted into the holes 5 and 15 and attached. Arch guide 20 for both rods 12, 12
The attachment point to the brackets 15, 15 is further away from the guide plate 16 formed by the inner wall surface of the arch cover 11, and therefore the arch guide 20 is attached to the guide plate 1 by its own weight.
It is constantly urged in six directions, and the edge of the outer circumferential piece 21 abuts the guide plate 16, and the edge of the inner circumferential piece 22 faces the guide plate 16 formed by the inner wall surface of the arch cover 11. In the case where the inner peripheral piece 22 is formed by bending a piece of a U-shaped member, the guide plate 16 has an edge formed by the inner wall surface of the arch cover 11.
They face each other through a tiny gap. Incidentally, one end of each of the rods 12, 12 may be attached to both corners of the upper side of the arch guide 20, instead of being attached to the left and right substantially vertical straight parts of the arch guide 20 as described above. It is sufficient that the guide plate 16 receives an appropriate force from its own weight in the direction of the guide plate 16. Further, if necessary, the arch guide 20 may be configured to be constantly urged by a spring or the like in the direction of the guide plate 16 with a constant force that is released when the band is pulled back. In the packing machine body, there is a solenoid (not shown) as a means for forcibly opening the arch guide, or a shaft end of a camshaft 40 that operates a welding mechanism S including a band tip gripping mechanism G as shown in FIGS. 2B and 2C. The upper end of a sliding member 47, which includes a cam follower 42 that rotates in sliding contact with a cam 41 provided in You can do it like this. Note that a sliding member may also be provided in the exit-side linear portion EX on the fourth corner Z side so as to be interlocked with the sliding member 47 so as to forcibly open this portion. Alternatively, instead of forming the guide plate 16 on the inner wall surface of the arch cover 11, a separate plate piece having a square shape as a whole may be attached to the inner peripheral surface of the arch cover 11 to serve as the guide plate. In FIG. 1, feed rollers 33 and 34 feed the band to the arch guide 20 and pull it back from the arch guide 20 to escape. Next, the operation of the above embodiment will be described. Now, the band B is moved to the arch guide 20 and the arch cover 11 by normal rotation of the feed rollers 33 and 34.
The band is fed into a band passageway 24 formed by a space between the guide plates 16 formed by the inner wall surfaces of the band.
The band runs along the inner surface of the outer peripheral piece 21 of the arch guide 20 in the opposite direction to the center of each arch,
It passes through the U-shaped linear part EN on the band entrance side near the first corner part W to the first corner part W, where the cross-section of the inner wall is C-shaped; It goes around the arch guide 20 through the fourth corner parts X to Z and the straight part with a U-shaped cross section between each corner part, and then passes through the straight part EX in a U-shape on the band exit side near the fourth corner part Z. It has reached the bottom surface of the slide table 31, and when the start button is turned on, the camshaft (not shown) rotates, and the tip of the band B reaches the gripping mechanism G.
It is gripped and fixed by. Arch guide EX in the straight section near the 4th corner Z near the band welding mechanism S
The inner width of the band is slightly narrower than that of other parts depending on the band thickness or the internal guide body (not shown), so that the bands on the supply end side and the tip side overlap accurately. At the same time as this gripping of the tip of band B, the feed roller reverses and the band B
is pulled back. At this time, the band B in the band passage path 24 formed by the arch guide 20 and the guide plate 16 starts to escape from the first corner W of the arch guide 20, and as shown in FIG. 3A, The arch guide 20 moves in the direction of the opening 23 along the inner surface of the inner circumferential piece 22, and the arch guide 20, which is biased toward the guide plate 16 by its own weight (and spring), is successively expanded, and the inner circumferential piece 22 is moved toward the opening 23. It escapes from the arch guide 20 while being restricted by the opening edge and the surface of the guide plate 16 (FIGS. 2C and 3B)). arch guide 20
Since the inner circumferential pieces 22 at each of the corner parts W to Z are inclined toward the opening 23 and toward the center of the arch, they can escape from the arch guide 20 extremely smoothly, and the band is not engaged within the arch guide 20. You will not be stopped and unable to escape. arch guide 2
The inner peripheral piece 22 of each corner portion W to Z of 0 is a guide plate 16 formed by the inner wall surface of the arch cover 11.
Even when there is a minute gap with respect to the surface of the arch guide 20, the band running inside the arch guide 20 runs while being pressed against the outer circumferential piece 21 that comes into contact with the guide plate 16 at a substantially right angle, so it never jumps out of the gap. It is. Note that if the outer circumferential piece 21 is in contact with the guide plate 16 formed by the inner wall surface of the arch cover 11 at right angles, that is, if it is formed horizontally, the arch cover 11 or the guide plate 16 is not necessary for band travel (supply). It is. Then, in the area where Band B's escape has finished,
The arch guide 20 sequentially returns under its own weight (and spring) in the direction in which the outer peripheral piece 21 contacts the guide plate 16. The band wound around the object to be packed is tightened by pulling back as described above, and after going through a series of processes of gripping the supply end, cutting, and welding, the band is fed into the arch guide 20 for the next packing, and one packing process ends. In addition, when using a means for forcibly expanding the linear portion near the first corner W or second corner Z of the arch guide 20 shown in FIGS. 2A and 2B, before the feed roller starts to reverse rotation, Camshaft 4 that starts rotating
0, the band tip gripping mechanism G is actuated and after the band tip is gripped, the sliding member 47 is slid by the cam 41 provided on the camshaft 40 to remove the straight portion.
EN is moved forward in the paper of Figure 1, and after the reversal of the feed roller is completed (usually the rotation time is adjusted by a timer according to the arch size), the arch guide 2 is rotated simultaneously with the rotation of the camshaft 40 that tightens the band. to return to its former position.

【effect】

As described above, the present invention provides a band guide arch for a packaging machine in which a series of arch guides forming a band passing path with one side open are formed, and both ends thereof face a band welding mechanism. The opening surface is formed to face the guide plate in a cover-like manner, and each corner portion is formed from two sides with an inner wall surface having a substantially L-shaped cross section, and one piece in the direction of the center of the arch forms an acute angle with the guide plate. The arch guide is formed so as to be inclined toward the center of the arch, and one piece in the direction opposite to the center of the arch is formed to contact the guide plate at a substantially right angle, and the portions other than the corner portions of the arch guide are formed to have a substantially U-shaped cross section. Therefore, when pulling back the band, the band should be pulled out along one inclined surface in the longitudinal direction of the arch center direction of the corner portion of the arch guide, and the band should be pulled out reliably and smoothly from each corner portion and the straight line between each corner portion. became possible. Moreover, since the arch guide can be formed wide, even if the band meanderes, this meandering can be absorbed and the band can run smoothly within the arch guide without causing jamming.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a schematic view of the main part, and FIGS. 2A and 2B are perspective views of the vicinity of the band welding mechanism and an example of the forced opening means for the arch guide. Figure C is a partially cutaway perspective view of the first corner showing the band in its released state; Figures 3A, B, and C are taken along lines A-A and B in Figure 1, respectively;
4 is a partial sectional view showing the arch guide 20 in a suspended state.
In addition, FIGS. 5 to 8 show the prior art,
FIG. 5 is a perspective view, FIG. 6 is a sectional view, and FIGS. 7 and 8 A and 8 are schematic partial sectional views showing problems of the conventional technology. 10... Band guide arch, 11... Arch cover, 12... Rod, 15... Bracket, 1
6... Guide plate, 20... Arch guide,
21... Outer circumferential piece, 22... Inner circumferential piece, 23... Opening, 24... Band passing path, 33, 34... Feed roller.

Claims (1)

[Claims] 1. In a band guide arch for a packaging machine, in which a series of arch guides forming a band passing path with one side open are molded, and both ends thereof face a band welding mechanism, the opening surface of the arch guide is guided in a covered manner. Each corner part is formed facing the plate, and each corner part is formed from two sides with an inner wall surface having a substantially L-shaped cross section, and one piece in the direction of the center of the arch is inclined in the direction of the center of the arch so as to form an acute angle with respect to the guide plate. A packing machine characterized in that one piece of the arch guide in the opposite direction to the center of the arch is formed to abut substantially perpendicularly to the guide plate, and a portion other than the corner portion of the arch guide is formed to have a substantially U-shaped cross section. Band guide arch.