JP2006224982A - Band feeder in strapping-packing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a band feeder in a strapping-packing machine capable of reliably preventing a tip of a band from slipping out of the band feeder when pulling back the band during a trouble. <P>SOLUTION: In the band feeder, a first feed roller consisting of a pair of a driver roller 51 and a nip roller 52 pressed against it, a second feed roller consisting of a pair of a drive roller 53 and a magnet roller 54 pressed against it, and a pair of a large-diameter wheel 55 and a follower roller 56 pressed against it are arranged in this order. The opening/closing operation of the first feed roller is interlocked with the opening/closing operation of the second feed roller via a link mechanism, and the rotational direction of the drive roller 51 of the first feed roller is set to be only one direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a band supply device in a banding machine for banding a package or the like with a resin band.

Banding a package (hereinafter referred to as “work”) packed with industrial products, foods and the like with a resin band (hereinafter simply referred to as “band”) is performed. The band is made of, for example, a colored polypropylene resin having a thickness of about 0.5 to 1.0 mm with a net-like protrusion formed on the surface.
First, if the band is supplied to the band guide arch surrounding the table on which the package is placed, the overlapped portion that has made one round is fixed, the band is pulled back and tightened, the overlapped portion is heated and welded, and the end portion is cut. The cycle is complete. The band supply device is disposed below the band guide arch, and sends the band in the supply direction and pulls it back in the reverse direction to tighten it. In addition, when the band supply is not performed smoothly sometimes and the arch is stopped without making one round, it is necessary to pull back the band and supply again.

Japanese Patent Application Laid-Open No. H10-228561 describes a method of supplying such a re-feed (band refeed). This will be briefly described with reference to FIG.
FIG. 7 is a configuration diagram of a banding machine described in Patent Document 1. 1 is a table on which a work is placed, 11 is a stopper provided at the lower part thereof, 2 is a band guide, 3 is an arch, 4 is a band In the feeding device, 41 is a normal rotation driving roller, 42 is a reverse rotation driving roller, 43 is a touch roller, 44 is a link, 7 is a guide roller, B is a band, and W is a workpiece.

The touch roller 43 is pressed against either the forward drive roller 41 or the reverse drive roller 42 by the link 44. A band supplied from a band reel (not shown) passes through the guide roller 7 and enters the band supply device 4. If the touch roller 43 is pressed against the normal rotation driving roller 41, the band guide 2 moves upward to enter the band guide 2. Enter arch 3 via When the tip of the band B reaches the stopper 11, the link 44 is switched and the touch roller 43 is pressed against the reverse drive roller 42, the band B is pulled back, and the band B comes into close contact with the workpiece W on the table 1 and is welded in this state. Is done. In this band supply / retraction device 4, the forward drive roller 41 and the reverse drive roller 42 arranged in the path of the band B are always rotating in the normal direction or the reverse direction, respectively. The band is supplied or tightened. By the way, when there is a trouble in supplying the band as described above, the band is pulled back and the supply is performed again. However, when the band is pulled back, the band is excessively returned and the leading end of the band falls below the entrance of the band supplying device 4. If you do, you will have to go through the band again. In order to avoid such a situation, in the band refeed method described in Patent Document 1, the rotation speed of the touch roller 43 at the time of band supply is stored, and when the band is pulled back, the pullback speed is set by the rotation speed set from this rotation speed. The speed is reduced, and the tip of the band B is stopped at a predetermined position in the band supply device 4.
JP 2004-123157 A

In the conventional method as described in Patent Document 1, it cannot be said that there is no situation where the timing of deceleration deviates to a lower level, and if it is decelerated early, it takes work time and efficiency. There is a problem that it decreases.
An object of the present invention is to solve such problems and to realize a band supply device that reliably stops the front end portion in the band supply device without falling off.

  The present invention provides a first feed roller composed of a pair of a driving roller driven at a high speed and a nip roller pressed against the first feed roller, and a second feed roller composed of a pair of a driving roller driven at a high speed and a magnet roller pressed against the first feed roller. In the band feeding device in the banding machine, a feed roller, a pair of a large-diameter wheel driven at a low speed and a pair of follower rollers pressed against the wheel are arranged in this order toward the arch of the banding machine. The band feeding device in the banding machine is characterized in that the opening and closing of the feed roller and the opening and closing of the second feed roller are interlocked via a link mechanism so as to synchronize. When the feed roller and the second feed roller are opened, the roll interval of the first feed roller is the second. A band supply device in the banding machine, wherein the link ratio is set to be larger than that of the feed roller, and the driving roller of the first feed roller rotates only in the band feeding direction. .

  According to the present invention, when the tip portion of the two-stage feed roller closes to the inner arch is mechanically closed, the other feed roller is mechanically closed to capture the band. The band can be re-feeded easily and the working efficiency is improved.

  In the present invention, feed rollers for supplying and pulling back the band at high speed are provided in two stages, and either one acts on the band at the same time. By synchronizing the opening and closing, the two cooperated so that the tip can be reliably stopped in the middle of the two stages even when the tip is pulled back.

  Hereinafter, the present invention will be described in detail with reference to the drawings. First, a banding machine will be described with reference to FIG. FIG. 6 is a front view of the banding machine, 1 is a table on which a workpiece W is placed, 3 is an arch to which a band B is supplied, 5 is a band supply device of the present invention which will be described in detail later, and 7 is at the entrance thereof. A guide roller, 8 is a band reel around which the band B is wound, 9a is an operation panel, and 9b is a foot switch.

  In this banding machine, the band B unwound from the band reel 8 is supplied to the arch 3 from the band supply device 5 through the guide roller 7 to band the work W. In the band supply device 5 for feeding and pulling the band, the two pulling operations are performed, that is, the primary tightening that pulls back at a high speed with a weak force and the secondary tightening that pulls back slowly with a strong force. Can be done. Feed rollers are provided in two stages, and opening and closing are synchronized. Band feeding uses two sets of feed rollers. The primary tightening is performed by rotating the second feed roller in the reverse direction, and the secondary tightening uses a low-speed wheel. The band pullback at the time of trouble uses the second feed roller for the pullback itself, but it is the first feed roller that captures and stops the tip.

  FIG. 1 is a front view of the band supply device 5, wherein 51 is a driving roller driven at high speed, 52 is a nip roller pressed against the driving roller, and these pairs constitute a first feed roller. The drive roller 51 is provided with a one-way clutch in the drive mechanism and rotates only in the direction in which the band B is fed. 53 is a driving roller driven at a high speed, and 54 is a magnet roller pressed against the driving roller. These pairs constitute a second feed roller. The magnet roller 54 has two magnets attached in the diameter direction, and 57 is a counter that detects the approach of the magnet and counts the number of rotations. 55 is a large-diameter wheel driven at a low speed, and 56 is a follower roller pressed against the wheel. A guide for guiding the band B is attached to the band path between the rollers.

  FIG. 2 is a rear view of the band supply device 5 of FIG. 1 as seen from the back side. 61a to 61c are pulleys for driving the belt, 62a and 62b are belts, 63 is a link, 64 is a lever, and 65 is a spring. The following items will be explained later. The pulley 61a has a small diameter attached to the output shaft of the motor, and drives the pulley 61b via the belt 62a. Further, the pulley 61b drives the pulley 61c via the belt 62b. Although the pulley 61b has a larger diameter than the pulley 61a and is slightly decelerated, the pulley 61a and the pulley 61b rotate at high speed. The pulley 61b is directly connected to the drive roller 53, and the pulley 61c is directly connected to the drive rollers 51 and 53 or connected via the one-way clutch described above, and these drive rollers 51 and 53 are rotated at high speed. On the other hand, the front side of the motor communicates with the wheel 55 via a gear reducer, and slowly rotates the large-diameter wheel 55 with a large torque.

  FIG. 3 is an explanatory view showing only each roller in FIG. The driving rollers 51 and 53 and the wheel 55 that are driven are fixed in position, but the nip roller 52, the magnet roller 54, and the follower roller 56 can be opened and closed at different intervals by a link mechanism. In addition, the movements of the nip roller 52 and the magnet roller 54 are interlocked. FIG. 4 is a partial front view showing only the link mechanism for connecting them, FIG. 5 is an explanatory view schematically showing this, and 63a to 63c are three (first to third) links, 66a and 66b. Are the rotation centers of the links 63a and 63b, 64 is a lever for manual operation, and 65 is a spring.

  As shown in FIG. 5, the magnet roller 54 attached to the first link 63 a is pressed against the drive roller 53 via the band B by the spring 65. At the same time, the nip roller 52 attached to the third link 63c via the intermediate second link 63b is also pressed against the drive roller 51 regardless of the presence or absence of the band. In a state where there is no band B, the first feed roller is adjusted to come into contact with the other party and the second field roller also approaches. This adjustment is easy by adjusting the length of the second link 63b.

For example, when the lever 64 is operated in the direction of the arrow, these two sets of feed rollers are separated from the other roller as indicated by the arrow, so that the band can be manually pulled out or sent.
The link ratio is set such that the roll interval is 2.5 times, for example, so that the roll interval a in the first feed roller is larger than the roll interval b in the second feed roller. This setting can be easily performed by appropriately selecting the length of each link, the position of the rotation center, the connection position of each link, and the like.

The follower roller 56 is opened and closed by another link mechanism (not shown), but since this part is already known at the time of filing the present application, the details are omitted.
From the above configuration, at the time when the band B is fed, the band B is fed by the first feed roller at the point in time when the front end portion is intermediate between the first feed roller and the second feed roller. In the first feed roller, a corresponds to the thickness of the band B, and in the second feed roller where the band has not yet reached, it is narrower and slightly open. When the leading end reaches the second feed roller, the roll interval b of this part spreads to the thickness of the band B, and the interval a of the first feed roller is further larger, so the first feed roller is No longer contributes to band feeding.

The same applies to the case where the band is pulled back by high-speed primary tightening. At first, since the band exists in both the first and second feed rollers, only the second feed roller is involved in the pull-back. The feed roller remains largely open.
When the tip is pulled back due to a trouble or the like, the second feed roller is reversed and pulled back. However, when the tip passes through the second feed roller, the magnet roller 54 approaches the drive roller 53 by the force of the spring 65. In conjunction with this, the first feed roller is also closed, so that the roll interval a is limited and the band is pressed. However, since the drive roller 51 has a one-way clutch and does not reverse, the band is not pulled back any further, and the tip end is reliably stopped between the first feed roller and the second feed row, so it comes out. Does not occur, and refeeding can be performed easily.

It is a front view of the band supply apparatus of this invention Example. It is a rear view of the band supply apparatus of an Example of this invention. It is explanatory drawing which showed only each roller in FIG. It is a partial front view which shows only a link mechanism only for each roller in an Example. It is explanatory drawing which showed the link mechanism of FIG. 4 typically. It is a front view which shows the banding machine of an Example of this invention. It is a block diagram of a conventionally well-known banding machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Table 2 Band guide 3 Arch 4, 5 Band supply apparatus 7 Guide roller 8 Band reel
9a Operation panel
9b Foot switch
11 Stopper
41 Forward drive roller
42 Reverse drive roller
43 Touch roller
44 links
51, 53 Drive roller
52 Followerola
54 Magnet roller
55 wheels
56 Followerola
57 counter
61a to 61c pulley
62a, 62b belt
63a-63c links
64 lever
65 Spring
66a, 66b Center of rotation B Band W Workpiece

Claims (3)

  A first feed roller consisting of a pair of a driving roller (51) driven at high speed and a nip roller (52) pressed against it, a driving roller (53) driven at high speed, and a magnet roller (54 ) Pair of a second feed roller, a large-diameter wheel (55) driven at low speed, and a pair of follower rollers (56) pressed against it, toward the arch (3) of the banding machine In the band supply device (5) in the banding machine arranged in order, the link is made so that the opening and closing of the first feed roller (51, 52) and the opening and closing of the second feed roller (53, 54) are synchronized. The band supply apparatus in the banding machine characterized by interlock | cooperating through a mechanism.   When the first feed roller (51, 52) and the second feed roller (53, 54) are opened, the one with the first feed roller (51, 52) having a roll interval is the second feed roller. The band supply device in the banding machine according to claim 1, wherein the link ratio is set to be larger than that of (53, 54).   The band supply device for a banding machine according to claim 1 or 2, wherein the driving roller (51) of the first feed roller rotates only in the band feeding direction.