JPS6311A - Band guide arch in packaging machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

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

[Technical background]

The own RJ packing machine equipped with a so-called band guide arch feeds packing bands into the band guide arch by a band supply mechanism 41111 in the packing machine main body, and arranges them in a loop so as to surround the object to be packed. After the leading end of the band is gripped and fixed by the band tip gripping mechanism in the main body, the band supply end side is pulled back by the band tightening mechanism in the main body, and the band escapes from the flap in the band guide arch described in i7'iI. After tightening the band and binding the object to be packed, the band starting end side is gripped and fixed by the band supply end side gripping mechanism, and then the overlapping parts of the band front end side and the supply end side are welded by the band welding mechanism in the main body. , the packing is performed by cutting off the weld near the supply end side.

[Prior art and problems]

In a normal general-purpose automatic packaging machine, the band guide 1-ch is installed perpendicularly to the upper surface of the main body in a downward U-shape,
The inside includes a bandway forming a band passage path, and the entire length of the bandway in the longitudinal direction is covered with a top surface of the main body of the bandway through a band passage permitting gap, which is closed during normal times so as to be opened when the band is pulled back. A plurality of openable and closable flaps that are biased through the material itself or springs, an arch frame that is integrated with the bandway or that mounts and fixes the bandway, and these parts are housed inside, and the band When the band placed in the way is pulled back from the supply end side, the flap is pushed open and the band does not escape from the flap. It is composed of. Then, when the band is pulled back, the band itself pushes open a number of flaps that are normally biased to be closed, the band is pulled out from the flaps, and the band is wound around the item to be packed. In order to improve packing efficiency, it is necessary to carry out packing as quickly as possible at high speed, and there is a distance between the bandway and the loop-shaped band inserted into the flap and the surface of the item to be packed. Therefore, the band that escapes from the many flaps that are released falls onto the object to be packed in a meandering manner, and the band is tightened by friction with the top corner of the object to be packed, which has a rectangular top surface, for example. If the band is packed diagonally to the object, the extra band will loosen during transportation because it is not packed at the shortest distance from the object, and in the worst case, the band will come off the object. This resulted in a fatal flaw. Particularly in the case of narrow bands with five or six corners, 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 particularly high friction. Such packaging defects are likely to occur. Therefore, as a means to eliminate this drawback,
7400, as shown in FIGS. 8 and 9, a series of arch guides 1 made of flexible resin having a U-shaped cross section are curvature-deformed into a loop shape, and both ends of the arch guides are formed into bands. The U-shaped opening surface is pressed against the inner wall surface of the arch cover 2 by a plurality of springs 3 to form a band passage passage 4, and when the band is pulled back, the entrance horizontal part of the arch guide 1 is pressed against the inner wall surface of the arch cover 2. This is a forced expansion. However, this method is not durable because 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.
The following shortcomings or problems were found. First, according to the above means, as shown in FIG. 10, 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 8 is caught (locked) on the inner wall of the arch guide 1, resulting in a situation where the band cannot escape from the arch guide 1 and cannot be pulled back. The arch guide 1 is tightly attached to the arch center direction, that is, the inner surface, and the band is locked to the inner surface, and when the band is pulled back, the horizontal part of the arch guide 1 on the band entrance side is forcibly expanded. Even so, a situation occurred in which the band could not be pulled out smoothly from the arch guide 1. This kind of situation often occurs especially at corners. 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 before it completely escapes from the arch guide 1, and the welding process that is performed next causes the arch guide However, there was a problem in that the strap itself was packed up. Second, this problem is particularly noticeable in thin, stiff, narrow bands and relatively inexpensive foreign-made bands, but plastic bands for packaging machines, such as polypropylene bands, require a manufacturing process that involves stretching or a paper core tube. (For example, a 6-width band with a 2m
(150~270+nw+) The band that runs while flexing in a waveform (waving) within the arch guide exhibits even more wavy or mountain-like flexure as shown in Fig. 10.
t,,,,, the band is completely locked inside the arch guide 1, so it does not run inside the arch guide 1, and the band is stuck in the arch guide 1, so the band cannot escape and cannot be pulled back. A situation arises. In addition, the height of the band passing path of the arch guide is formed as low as possible in order to correct the waveform, that is, the component force that causes the band to sag when the band travels, in the M-line direction. However, if the height of the arch guide 1, that is, the band passage path 4 is formed high in order to avoid the above-mentioned situation, the band B will stand up when being supplied, as shown in FIGS. 11(A) and (B). Otherwise, the waveform becomes large, and if the band is particularly weak, it will fold overlappingly, making it impossible for the band to run, and when pulling 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. Furthermore, if the arch guide is made higher than the band width, the band will stand upright when the band is supplied, and will eventually turn over within the arch guide 1. Thirdly, when the width of the arch guide is made wider in an attempt to absorb the meandering of the band, the arch guide's input r: 161! Even if the I-horizontal part is expanded, escape of the No. 5-nd will become even more difficult. Therefore, the applicant has already prepared Figures 1 and 2 (A). As shown in (B), in order to correct the drawbacks of the prior art described in Utility Application No. 61-35350, an arch guide 20 forming a band passage passage 24 with one side open is molded in a series, and both ends are respectively In the band guide arch in the darkness facing the band welding mh1, the opening surface of the arch guide is formed to face the guide plate 16 in a cover-like manner, and the inner wall surface of each corner portion has an omitted cross-sectional shape. It is formed with two sides 21 and 22, one piece 22 in the direction of the center of the arch is formed to be inclined in the direction of the center of the arch so as to form an acute angle with respect to the guide plate, and one piece 21 in the direction opposite to the direction of the center of the arch is approximately connected to the guide plate. A band guide arch comprising an arch guide has been proposed, which is formed so as to abut at right angles, and the arch guide has a portion other than the corner portions having a substantially U-shaped cross section. According to this band guide arch, the band passing path of the arch guide is made wide to absorb the meandering of the band and supply the band smoothly.
When pulling back the band, it is possible to sequentially and reliably and smoothly pull out the band from the corner of the arch guide's cross-section. By the way, as shown in FIGS. 6(B) and (C), the corner part where the straight part of the arch guide and the M communicate with each other are cut out at a predetermined angle or folded at a predetermined angle. The straight part of the band passes through the entrance end in the band supply direction of the corner part that communicates with the @ line part of the arch guide, so that the angle gradually increases as it goes in the traveling direction of the band supply direction. A device that is integrally connected to the channel, or a device that leaves the inlet end of the knee portion in the supply direction at a predetermined angle like the other parts [same figure (A)] will be manufactured and applied. However, normally, the band that enters the corner part runs in such a way that it is pressed by centrifugal force in the direction opposite to the arch center direction at the corner part, but in any case, in the corner part, one side 22 in the direction of the arch center direction is attached to the guide plate. Since it is inclined towards the center of the arch to form an acute angle with respect to the arch, the space is greatly expanded compared to the straight part, and the force that corrects the undulating and sagging force when the band runs in the straight direction does not work ( As a result, the degree of freedom of the band increases rapidly, causing the band to play up and down, and in the case of the weak and inexpensive foreign-made bands mentioned above, the band waves due to running resistance in the band passage of the U-shaped arch guide. If the band is traveling with the tip of the band pointing upward and colliding with the outer circumferential piece of the corner, as shown in Figure 3, the band will continue to be supplied and the band behind will overtake the band tip that collided with it. This caused the band to become clogged at the corners, making it impossible to feed the band.Furthermore, even with a strong band, the feed roller could not move as soon as the band tip reached the band tip gripping mechanism inside the band car body. Since the band does not stop at the same time, the band in the arch guide receives a force in the feeding direction due to inertia, which causes the band to wave and a similar situation may occur in a very short period of time before the band feeding mechanism stops. Such a situation is likely to occur at the first corner W (FIG. 1) where the band running force is strongest.

【the purpose】

The present invention relates to an improvement of the above-mentioned Utility Application No. 61-35350, and makes it possible to run even an extremely weak band smoothly inside the arch guide including the corner portions, and to improve the arch guide. By making it possible to make the height and width of the band passing path in the straight part of the arch guide as low and wide as possible, it is possible to smoothly supply the band, and when pulling back the band, the band can be reliably and smoothly sequentially starting from the corner of the arch guide. The purpose of the present invention is to provide a band guide arch that can be pulled out.

【composition】

The structure of the present invention for achieving the above object will be explained based on FIGS. 1 to 6 corresponding to the embodiment. In the band guide arch for a packaging machine having an arch guide, the opening surface of the arch guide 20 is formed to face the guide plate 16 in a cover-like manner, and the inner wall surface of each corner portion W-Z has an oval shape in cross section. One piece 22 facing the center of the arch is formed to be inclined toward the center of the arch so as to form an acute angle with respect to the guide plate, and one piece 21 facing opposite to the center of the arch is formed approximately at right angles to the guide plate. While forming it so that it abuts,
The end edge of the arch guide having a cross-section of the corner section, for example, the rear end is located at the entrance end in the direction of band movement, and the tip is connected to this artificial end edge in the direction of the arch center of the straight section of the two-character arch guide. A special effect is that a guide portion 30 is formed with a length that allows a band to pass through the intersection point between the extension line of one piece and the inner wall of the corner portion of the corner arch guide in the direction opposite to the arch center. . Therefore, the band B supplied into the arch guide 20 is
The band travels within the band passing path of the arch guide 20 due to the feeding force, and at the corner portion, the band is pressed by the guide portion against a piece in the opposite direction to the arch center of the corner portion, and when feeding the band, the band travels within the band passage path of the arch guide 20. Even if the band tries to become wavy in the same manner as in the straight section, the waveform is lowered to smoothly supply the band, and by pulling it back, the first corner W of the arch guide 20 is moved toward the opening 23 along the piece 22 in the direction of the arch center. The arch guide 20 is sequentially pushed out from the second corner to the fourth corner X to Y-2 and escapes.

【Example】

Hereinafter, details of the present invention will be explained based on drawings showing embodiments. In FIG. 1, a band guide arch 10 is mounted on the main body of the packing machine, which has a band reel wrapped with a packing band and houses various mechanisms necessary for packing such as a known band supply, tightening mechanism, and welding mechanism S. An arch cover 11 straddling the arch is provided. This arch cover 11 is made up of a front and rear pair of frame bodies each having a truncated cross-section and a U-shaped frame body.
It is fixed vertically on the packaging machine body. An arch guide 20 is provided within the arch cover 11. This arch guide 20 has a corner portion W-
It forms a substantially downward C-shape with straight lines other than 1, and as shown in Figs. 1 and 5, the lower end faces the band welding mechanism S when supplying the band and connects the linear part EN on the entrance side of the band. The other end is the band tip gripping machine of Band #II machine WIS *
Facing G, it forms the straight section EX on the exit side of the band. In the illustrated embodiment, the arch guide 20 has each corner part W-2 and each straight part molded separately and connected in series, so that the straight part can be changed to an appropriate length and can be adjusted to any desired length. This allows you to obtain the correct arch size. The first to fourth corner portions W to 2 of the arch guide 20 shown in FIG. 1 are integrally formed by cutting or drawing synthetic resin or metal such as aluminum, as shown in FIG. 2(A). An inner peripheral piece 22 that forms a piece in the direction of the center of the arch and an outer peripheral piece 21 that forms a piece in the opposite direction to the center of the arch are formed, each of which has a straight and smooth inner surface, and the cross section of the inner wall is substantially horizontal. The inner surface of the outer peripheral piece 21 is approximately perpendicular to the guide plate 16 formed by the inner wall surface of the arch cover 11, and the inner surface of the inner peripheral piece 22 is inclined toward the center of the arch toward the opening 23. Guide plate 16
It is formed at an acute angle to the In other words, each corner W-1 is formed by extending the inner peripheral piece 22 of the arch guide, which is formed into a substantially U-shaped cross section with a constant curvature, from both ends in the longitudinal direction to the center, as shown in FIG. 2(A), for example. The arch guide may be bent so as to gradually incline toward the center of the arch by, for example, about 25 degrees, or the arch guide may be formed to have a substantially U-shaped cross section with a constant curvature, as shown in FIG. 6(B). After molding, the inner peripheral piece 2 is formed from both ends in the longitudinal direction to the center.
The inner surface of 2 may be cut so as to be gradually inclined toward the center of the arch. No matter which molding method is used, the band passing path 24 formed in each corner W-2 is continuous with the band passing path of the straight portion described later at both longitudinal ends of the corner portion, and the opening 23 surface is continuous. It is molded to become. A guide portion 30 is formed at the entrance end in the band traveling direction of the arch guide having a box-shaped cross section at the corner portion. This guide portion 30 may be provided at each corner portion, but according to the purpose of the present invention, it may be provided only at the first corner portion W in FIG. That is, the guide portion 30 is arranged such that the third corner Y is in the rearward normal position in the first drawing, or the first corner W is in an inverted position in the longitudinal direction of the first drawing, as shown in FIG. 5, which shows only the band passage path. is located at the edge of one piece 22 in the direction of the arch center of the straight U-shaped arch guide whose rear end communicates with the entrance of the corner section in the direction of band movement, and its length is at most The intersection point where the extension line M of the piece 22 of the straight U-shaped arch guide in the direction of the arch center that connects with the inner wall of the piece 21 of the corner part of the U-shaped arch guide in the direction opposite to the arch center and the center of the corner part. The longest length has a band passage allowable gap equal to or greater than the band thickness with respect to the inner wall of the piece 21 in the direction opposite to the arch center direction, and the tip of the guide part 30 is up to this position. If a guide portion is formed, even a band with no stiffness can be smoothly run through a corner portion. The double line of the guide portion 30 shown by the two-dot line a in the figure is slightly shorter than this. In the same figure, the radius of the corner is 150 mm, so
The length P at the intersection of the extension lines M is Cosθ=147÷1
50 and θ=11,478P=147・tanθ 2
It is 9.9++m. Since the total length of each corner portion is 2πr÷4=235.62peng, even if the guide portion is the longest, it is only about 12% of the corner portion. 6(A) to 6(H) show aspects of the guide portion 30, and FIG. 6(A) shows a metal piece having approximately the same width as the band passageway in the direction of the arch center of the U-shaped arch guide. The rear end is fixed to the outer edge of the U-shaped piece 22, and the tip is exposed to the band passing path at the corner.As in the same figure (C), one side of the U-shaped piece is pushed out to form a square. The guide portion 30 is formed by gradually widening one piece 22 in the direction of the center of the arch, as shown in FIG. 3(C). Further, FIG. 3B shows an example of processing the guide portion 30 in a case where a steep inclination angle is formed by cutting, and the steep inclination angle makes it easier for the band to escape. Figures (D) to (H) show another aspect, in which the upper surface of the guide portion 30 rises once toward the outer peripheral piece 21 side from the entrance end in the band traveling direction, and then forms a cross-section in the shape of a letter. It is formed with a sharply widening angle. According to this embodiment, locking can be reliably prevented even if a strong band with a slightly thick band width waves at the corner portion. In addition, each straight section other than the corner W-2 is shown in Figure 2 (B).
As shown in FIG. 2, an outer circumferential piece 21 and an inner circumferential piece 22 facing each other parallel to each other are formed of a single piece of metal or resin and have a U-shaped cross section, or are formed of metal strips having the same width and length, respectively. The opening 23 is formed to have a U-shaped cross section, and the opening 23 is formed to be continuous with the opening 23 of each corner, as described above. In this way, the arch guide 20 consisting of each corner part W-1 and each straight part has a width of the used band (for example, 4°5 to 19 mm).
) depending on the width of the band, for example about 25 times wider than the band width of 5 to 6 m, and the height is lower than the band width, for example, in a straight section, height H3IIIm1 width Q25m, corner The inclination angle θ25° of the inner peripheral piece 22 of the part,
It is formed to have a width Q 25 w+m, and as shown in FIG. 4, the height H of the corner opening surface 23 is 14.66 where H=(25・tanθ)=11.66+3.
+in+ band passage path 24 is formed. In addition, when using the present invention with a fixed arch size,
As described above, it is not necessary to mold the corner portions and the straight portions of the arch guide 20 separately and connect them, and any molding means can be used, such as molding the entire body in series and integrally. Furthermore, in the above embodiment, the guide portion 30 is formed at the entrance end of the corner portion in the band traveling direction, but the guide portion 30 may also be formed at the exit end of the corner portion in the band traveling direction. If provided, the functions and effects described below will be doubled. In addition, in FIG. 1 and FIG. 7(A), the arch guide 20 is connected to the arch cover 1 by a pair of rods 12.12.
The arch cover 11 is suspended in the arch cover 1, and under normal conditions, due to its own weight, a series of openings 23 face the guide plate 16 formed by the inner wall surface of the arch cover 11. That is, both rods 12.1
The bent portions at each lower end of the arch guide 20 are rotatably fitted into the holes of brackets 14 and 14 fixed to the arch frame 36 on the left and right straight portions of the arch guide 20, and the bent portion at the other end is inserted into the upper side of the arch guide 20. Arch cover 11 above corner parts X and Y
The bracket 15.15 is rotatably fitted into the hole of the bracket 15, which is protruded from the inner wall of the bracket. The mounting points of both rods 12.12 to the arch guide 20 are brackets 15.15
The arch guide 20 is further away from the guide plate 16 formed on the inner wall surface of the arch cover 11 than the attachment point to the arch cover 11, and therefore the arch guide 20 is constantly urged in the direction of the guide plate 16 by its own weight, and the outer peripheral piece 21 and the inner peripheral piece 220g The #1 edge is in contact with the guide plate 16. Note that each end of both 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 only necessary that the guide plate 16 receives an appropriate force from its own weight in the direction of the guide plate 16. In addition, if necessary, the arch guide 20 can be
may be configured to be constantly biased in the direction of the guide plate 16 with a constant force that is released when the band is pulled back. This is to limit the width of movement of the arch guide 20 so that it does not exceed the band width when the band is released. Incidentally, when the arch size is extremely large, a vibrating member 47 may be provided within the packaging machine main body as a means for forcibly expanding the first corner portion W, as shown in FIG. The vibration member 47 has a lower end supported by a shaft, and an upper end connected to the first corner portion W of the arch guide 20 via the bracket 43.
The camshaft 40 is connected to the inlet straight portion EN near the band welding mechanism S, and is provided with a cam follower 42, which is provided at the shaft end of a camshaft 40 that operates the welding mechanism S including the band tip gripping mechanism G. The cam 41 is configured to slide and rotate in contact with the cam 41. In addition to the structure in which the vibration member 47 is vibrated by the cam 41 provided on the camshaft 40 as described above, the vibration member 47 may have a structure in which it is vibrated by using, for example, a solenoid. Further, another vibrating member may be provided at the exit flange line portion EX on the fourth hooker portion 2 side so as to be interlocked with the vibrating member 47, so that the armpit portion may also be forcibly opened. In addition, in the same figure, 33 and 34 are feed rollers that feed the band to the arch guide 20, and also supply the band to the arch guide 20.
Pull it back and let it escape. Next, the operation of the above embodiment will be described. Now, the band sheet is fed into the band passage path 24 which is a space between the arch guide 20 and the guide plate 16 formed by the inner wall surface of the arch cover 11 by normal rotation of the feed rollers 33 and 34. The band travels in each straight section of the arch guide 20 while waving and the slack force is corrected in the straight direction, and the guide section 30 at the entrance end in the band supply direction of the corner section continues to correct the slack force in the straight direction. It runs along the inner surface of the outer circumferential piece 21 in the opposite direction to the center of the arch in the section, passes through the @ line part EN on the side of the entrance of the band near the first corner part W, and then passes through the J part, which has a square cross section on the inner wall. After reaching the corner W, the inner wall passes through the second, third, and fourth corner parts Trowel-shaped straight section on the exit side EXJi! Then, it goes around the arch guide 20 and reaches the lower surface of the slide table 31. Since the band runs along the inner surface of the outer circumferential piece 21 in the direction opposite to the center of the arch at the corner portion, there is no need to provide a guide portion at the exit end of the corner portion in the band traveling direction. Then, when the start button is turned on, a camshaft (not shown) rotates, and the tip of the band B is gripped and fixed by the grip mtRG. It should be noted that if the width of the straight portion of the arch guide EX near the fourth corner z near the band welding mechanism S is formed to be slightly narrower than the other portions according to the band width (for example, if the width is not shown in the arch guide (The inner width of the arch guide may be made thinner by providing a guide body.) The bands on the supply end side and the tip side overlap accurately within this M line portion EX. At the same time as gripping the tip of the band B, the feed/opener 3
3.34 is reversed and band B is pulled back. As a result, the band B in the band passage path 24 formed by the arch guide 20 and the guide plate 16 first moves toward the opening 23 along the inner surface of the inner peripheral piece 22 at the first corner W of the arch guide 20. The first corner W
The opening edge of the inner peripheral piece 22 and the guide in the order of the upper straight part, the upper straight part of the second corner part x1, the third corner part Y, the straight part below the third corner part Y, and the fourth corner part 2. It escapes from the arch guide 20 while being restricted by the surface of the plate 16. At this time, the band B trying to escape from the arch guide 20 may move toward the opening 23 in a somewhat twisted state. Since the band B is inclined toward the center of the arch toward the opening 23, the band B can escape from the arch guide 20 extremely smoothly [Fig. 2 (A)
, Figure 4. In addition, both ends of the band B in the width direction are held between the tip edge of the inner peripheral piece 22 and the guide plate 16 to restrict the escape posture, so the band B escapes discontinuously and forms a meandering shape. When the band wraps around the object to be packed, the situation is reliably prevented, and the band gradually escapes from the first corner W of the arch guide 20 to the fourth corner Hz. Further, since the rods 12, 12 bias the arch guide 20 toward the guide plate 16 by their own weight, the escape posture of the band can be more reliably regulated. If a forced widening mechanism is provided in the linear portion EN of the arch guide 20 on the band entrance side, as shown in FIG. The cam 41 allows ffl to be
When the movable member 47 (and other vibrating members that operate in conjunction with this) vibrate, the entrance side linear portion EN (and the exit side linear portion EX) of the arch guide 20 moves toward the front in the paper of the first drawing, and at the same time, the feed The rollers 33,34 are reversed and the band is pulled back. Then, at the region where the band B has finished escaping, the arch guide 20 sequentially returns to the direction in which the edges of the outer circumferential piece 21 and the inner circumferential piece 22 come into contact with the guide plate 16 due to its own weight (and spring). After the band B is pulled back by the reverse rotation of the feed rollers 33 and 34 (usually the rotation time is adjusted by a timer according to the arch size), the band is tightened by rotation of the cam shaft 40 or the feed rollers 33 and 34. The band wrapped around the item to be packed is tightened,
At the same time, the vibrating member 47 returns the entrance side straight section EN (and the exit side straight section EX) of the arch guide 20 to its old position. Next, through a series of steps of gripping the band supply end, cutting, and welding, the band is fed into the arch guide 20 for next packaging, and the -tm wrapping process is completed.

【effect】

As described above, the present invention provides an arch of a U-shaped arch guide in which the rear end is located at the edge of the arch guide having a cross section of the corner part, and the straight part of which the tip communicates with the edge of B. Since the guide portion 30 is formed in such a length that it has a gap allowing band passage at the intersection between the extension line of one piece in the center direction and the inner wall of the corner portion of the corner arch guide in the opposite direction to the arch center direction, The band passing path of the arch guide can be formed low and wide, and even weak bands can be securely placed in contact with a piece of inner wall in the opposite direction to the arch center at the corner of the arch guide without folding in the corner. In addition, the band can be pulled out smoothly and the band can be pulled out continuously without wobbling as it escapes from the arch guide and wraps around the packaged item. can.

[Brief explanation of drawings]

Figures 1 to 6, excluding Figure 3, show embodiments of the present invention, in which Figure 1 is an overall schematic diagram, Figure 2 is a schematic diagram shown in (A), and Figure 4 is a cross section of a corner part. Figure 5 is a detailed explanation of the present invention 1! Ig diagram and FIGS. 6(A) to 6(D) are side views showing examples of the guide portion 30, respectively, and FIG. 6(E) is the same diagram (D).
Perspective views of (F), (G), and (H) are the same views (E
) are FF, GG, and HH cross-sectional views. Further, FIG. 7(A) shows an example of the support means for the arch guide, and FIG. 7(B) is a side view showing an example of the forced opening means for the arch. In addition, Figures 8 to 11@ show the prior art, and Figure 8
The figure is a perspective view, Figure 9 is a sectional view, Figures 10 and 11 (
A) and (B) are schematic partial cross-sectional views showing conventional problems. 10...Band guide arch 20...Arch guide 21...Outer circumferential piece 22...Inner circumferential piece 30...Guide section patent applicant Strabak Co., Ltd. agent Anatomist Tadashi Kotomi, Ming Figure 5 Near / 1 □l le' i/ J (Figure 6 (D) Figure 6 (F) Figure 6 (G) Figure 6 (H) Figure 7 (
B) Figure 9

Claims (1)

[Claims] In a band guide arch for a packaging machine having an arch guide having a substantially U-shaped cross section with both ends of the arch guide facing the band welding mechanism, the opening surface of the arch guide faces the guide plate in a covered manner. At the same time, 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 arch center is formed to be inclined toward the arch center so as to form an acute angle with respect to the guide plate. A piece in the opposite direction is formed to contact the guide plate at a substantially right angle, and the rear end is located at the edge of the arch guide having an L-shaped cross section at the corner part, and the tip communicates with this edge. There is a band passage allowable gap at the intersection of the extension line of one piece of the U-shaped arch guide in the straight part in the direction of the arch center and the inner wall of the corner part of the U-shaped arch guide in the opposite direction to the arch center. A band guide arch in a packaging machine, characterized in that a length guide portion 30 is formed.