JPS63258712A - Band supply and stretching device 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 usage total]

The present invention relates to a band supply/tightening device in a packaging machine.

[Prior art and problems]

The band supply/tightening device in a conventional packaging machine has a pair of feeds that sandwich and feed the band, as shown in FIGS. 4(A), (B) and 5(A), (B). One of the rollers 8 and 9, the upper roller 8, is connected to the main shaft 4.
1 is supported by an eccentric shaft 5 protruding from one end of the main shaft 41, and is inserted into and fixed to the other end of the main shaft 41.
The eccentric shaft 5 of the upper roller 8 is rotated by rotating the main shaft 41 by the weight of the weight 7 pushed through one end or by the tension of a spring (not shown) which urges one end of the adjuster 4 downward in FIG. It rotates in an arc and presses against the other main roller 9 connected to a drive mechanism (not shown) to pinch the band and obtain the frictional force necessary to feed the band. In this way, the band is held between the pair of feed rollers 8 and 9 by the weight 7's m2, the fixed position of the weight 7 on the adjuster 4, or only by the resistance of the spring, and the pair of feed rollers 8 and 9 are used to hold the band. Rotate forward in the feeding direction to feed the band out of the packing machine main body. Then, by setting this normal rotation time by one section using a timer, or by using a slide table switch installed under the slide table 32 that detects the arrival of the band tip, the band tip is moved to a predetermined position for starting to pull back. The main roller 9 stops rotating when it reaches above the left press 22, right press 20, etc. Incidentally, even though the band has already reached the bottom of the slide table 32 when the band is supplied, the main roller 9 is moved within the set time of the timer or by a signal from the slide table switch provided below the slide table 32. The main roller 9 will continue to rotate for a short period of time until the rotation of the main roller 9 is stopped, but the adjuster 4 is applied so that the driven upper roller 8 slips against the band on the main roller 9 which continues to rotate. The weight of weight 7 or [1 of weight 7 on adjuster 4]
Or, the pressing force of the upper roller 8 on the main roller 9 due to the tension of the spring is W! 1 has been done. Next, the right press 20 grips and fixes the band tip and pulls the band back into the main body. When the band is pulled back, that is, when the pair of feed rollers 8 and 9 are reversed, the band tip side is held as shown in FIG. Therefore, when the right press 20 rises, the shaft spring 24 inserted and fixed onto the press shaft 23, which rotates in synchronization with the vertical movement of the right press 20, rotates the adjuster 4, causing the upper roller 8 to rotate.
The suppression strength is increased by rotating the main four-ra 9 so as to press it against the main four-ra 9. The spring adjuster 25 is used to adjust the timing at which the shaft spring 24 rotates the adjuster 4. Therefore, when feeding the band, the pair of feed rollers 8 and 9 clamp the same part of the band during the time lag from when the tip of the band reaches the bottom of the slide table until the main roller 9 stops, since the band is not fed any further. The main roller 9 will idle and rub against the surface of the band, and the core will be scraped, locally crushed, and folded, causing the band to meander not only up and down, but also from side to side on a flat surface. Sometimes, a part of the circumference of the upper roller 8 and main roller 9 is exposed inside the band chute 6 which has a stone cutout 46, 47, and a so-called "niraping" condition occurs, causing the running band to fold inside the arch. This may cause a situation where the band gets caught and causes a band supply failure. Furthermore, if the pressing force of the upper roller 8 against the main roller 9 is too strong, the band will be further fed between the upper four rollers 8 and the main roller 9, which continues to rotate without slipping. There have been cases where the bands overlap in the band shooter 6, resulting in an accident where the bands are jammed. In addition, if the band gets caught in the arch when supplying the band, not only those that adjust the band supply time using a timer, but also those that use a slide table switch to stop the band supply may cause the time-up or If the band does not reach the sensing switch, friction of the band by the pair of feed rollers 8 and 9 or jamming of the band within the band shooter 6 or the arch may occur. If a band jam occurs in which the band is folded into many layers, the bending tendency cannot be resolved even if the machine is temporarily stopped and the band is manually pulled back. Particularly in the case of narrow and soft bands, which have recently been in high demand due to cost considerations, the band may be scraped and have a meandering habit.
Furthermore, the band may fold over itself from the scraped portion or the band jammed portion, making it impossible to use the band again the next time the band is supplied. Furthermore, even if a band could be supplied and tightened and the band could be encircled, accidents could occur such as the band breaking at the scraped or crushed part. Next, the pair of feed rollers 8 and 9 are reversely rotated, and the band is wound around the outer periphery of the object to be packed, and a step of tightly binding the band to the object to be packed is performed. The rotation mechanism of the adjuster 4 by the shaft spring 24 allows the pair of feed rollers 8 and 9 to be rotated.
When the band is reversed, the pressing force of the upper roller 8 against the main roller 9 is increased to pull the band back, and the tension arm 11 tightens the band, or following this pulling back, the band is tightened by a pair of feed rollers 8 and 9. Until the main roller 9 stops B& in response to a signal that detects the end of pulling back or tightening, the main roller 9 idles and the band is rubbed particularly strongly compared to normal rotation. Therefore, the band may be scraped to the same extent or more than when the band was supplied, and there is a risk of the band breaking due to meandering, jamming of the band, or continuation of the above-mentioned reversal. The length band had to be cut off, which was extremely uneconomical. In addition, in the case of a narrow and soft band, sufficient band running force cannot be applied unless the pressing force of the pair of feed rollers 8 and 9 is increased to a certain extent, which causes problems when supplying and tightening the band. The points become even larger.

【the purpose】

The present invention has been developed in order to improve such conventional drawbacks, and has an extremely simple configuration that can reduce the pressing force of the pair of feed rollers 8 and 9 without damaging the band, and also allows the band to be supplied and pulled back (tightening). It is finely adjusted according to the order in which the bands are stacked, and prevents excessive pinching pressure on the bands by the pair of feed rollers 8°9 to prevent accidents due to damage to the bands. An object of the present invention is to provide a band supply/tightening device for a packing machine suitable for the bands of the present invention.

【composition】

The structure for achieving the above object of the present invention will be explained with reference to the illustrated embodiment. One of the pair of feed rollers 8 and 9, the upper roller 8, is provided with a protruding center from one end of the main shaft 41. The upper roller 8 is supported by an eccentric shaft 5, and a convex strip 18 is formed on the circumferential surface of the upper roller 8, and the upper roller 8 is connected to the other roller connected to the drive mechanism by an array star 19 inserted and fixed to the main shaft 41. , a stopper 1 is provided facing the rotation locus of the adjuster 19 in the direction of pressing the main roller 9.

[Effect]

When the upper roller 8 approaches the main roller 9, the adjuster 19 is stopped by the stopper 1 and the rotation distance is reduced, and the pressing force of the upper roller 8 on the main roller 9 is regulated. The large surface pressure due to the protrusion 18 is adjusted to a moderate level by the stopper 1, and the band is
and the main roller 9, the convex strip 18 does not dig into the band more than necessary, and is compressed by a constant pressing force, so that even a soft and narrow band can be smoothly fed out of the main body. It is pulled back into the body or tightened.

【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 machine frame of the main body, and a tension cam 10, which rotates after the band is wound around the object to be packed and the band is pulled back, is supported by a shaft. Reference numeral 11 denotes a tension arm connected to the machine frame 15 via a spring 14, and an arm lever 12 having a trochanter 51 at its tip, which is provided substantially perpendicularly to and integrally with the tension arm 11 [Fig. 4 (B)]. ] is the tension cam 1o
is in contact with the cam surface of the This tension arm 11
The lower end is supported by a shaft 13 of the machine frame 16, and after the band pulling process, the band is held at the upper part and rotated counterclockwise in FIG. 1 about the shaft 13 to tighten the band. A bearing case 35 is formed integrally with the upper part of the machine frame 15 to protrude, and includes a main shaft 41 having an eccentric shaft 5 that eccentrically supports the upper roller 8, and a main four-wheel shaft 42 that supports the main roller 9. , each attached via a bearing. As shown in FIGS. 3(A) and 3(B), the upper roller 8 is supported by an eccentric shaft 5 protruding from the main shaft 41.
1 is configured to rotate in an arc shape in the counterclockwise direction in FIG. Approximately 4 in width
A protruding strip 18 with a width of 1/2 is formed, and the circumferential surface of the protruding strip 18 is formed to abut against the circumferential surface of the main roller 9, so as to provide sufficient running force to a narrow and soft band. The surface pressure is increased. Note that the width of the protrusion 18 is set to approximately one-half of the band width depending on the band width to be used. Accordingly, the configuration of the band shooter 6 is also such that the notch 46 of the shooter cover 26 is narrower than the conventional one so that the protrusion 18 can be fitted therein, and the band can smoothly run inside the band shooter 2 and the shooter 6. is configured to do so. An adjuster 19 bent into an L-shape is fixedly fixed to the shaft end on the opposite side of the eccentric shaft 5 formed on the main shaft 41 . One end of a spring 36 is attached to one end of the adjuster 19, and the other end of the spring 36 is attached to a lower bent portion of a support plate 37 attached to the bearing case 35 with a bolt 36.
Tension is applied by nut 39 through 8! I! ll! It can be installed freely. Further, an L-shaped pedestal 2 is screwed and fixed to the upper end of the support plate 37, and an adjuster 19 on the upper surface of the pedestal 2 is fixed.
A stopper 1 in the shape of a hexagonal bolt is screwed out with a locking nut 3 so that its height can be adjusted freely, and the upper end of the stopper 1 is attached to an adjuster 19 so that it can freely come into contact with it. Therefore, when the adjuster 19 is pushed downward, it comes into contact with the stopper 1, so it rotates a little and stops, and is prevented from rotating any further, and the pressing force of the upper roller 8 against the main roller 9 is restricted, thereby supplying and tightening the band. When the upper roller 8 slips, the large surface pressure of the ridges 18 of the upper roller 8 prevents the ridges 18 from digging into the band more than necessary. Furthermore, as shown in FIGS. 5(A) and 5(B), in a packing machine having a mechanism for increasing the pressing force of the pair of feed rollers 8 and 9 when pulling back the band, the tip side of the band is The right press 20 that grips the is fixedly attached to the other end of the right press arm block 27, which has a hole 30 having a slot 31 at one end. This hole 3
0, a press shaft 23 is pushed through and fixed by bolting. A shaft spring 24 and a spring adjuster 25 are each pushed through and fixed to one end of the press shaft 23, and the tip of the shaft spring 24 is provided in contact with the lower surface of a portion of the adjuster 19 that protrudes from the main shaft 41 toward the machine frame 15. ing. Next, the operation of the above embodiment will be explained. The adjuster 19 is pulled downward by the tension of the spring 36, and urges the main shaft 41 in the counterclockwise direction in FIG. As a result, the eccentric shaft 5 protruding from the left side of the main shaft 41 in FIG. The main roller 9, which is pressed by the roller 9 and whose peripheral surface faces into the band shooter 6 through the notches 46 and 47, and the protruding strip 18 pinch the band. The band is smoothly fed to the outside of the main body of the packing machine by normal rotation of a pair of feed rollers 8 and 9, and is fed through a band guide arch (not shown) or manually so that the tip of the band is fed below the slide table 32 (when it reaches the right press 20 rises and grasps the front end of the band.Then, the feed rollers 8 and 9 are reversed for the time set in the timer, the band is wound around the object to be packed, and after the set time has elapsed, the tension cam 10 rotates and the arm lever 12 is rotated. Through this, the tension arm 11 rotates counterclockwise in FIG. 1 to tighten the band. When the feed rollers 8 and 9 are in the forward or reverse direction, the stopper 1 is stopped and the nut 3 is tightened to tighten the band. At this time, the adjuster 19 contacts and locks the stopper 1 at a high position, and rotates the main shaft 41 only slightly.Therefore, the rotation distance of the upper roller 8 with respect to the main roller 9 is restricted.
The biting into the band by the ridges 18 of the upper roller 8 is adjusted to be small enough to not damage the band. On the other hand, when adjusting the stopper 1 to a lower value, the adjuster 19 rotates greatly and the main shaft 41 is rotated thicker. The adjustment is made to a large extent within a range that does not cause damage.In this way, the stopper 1 adjusts the force with which one roller 8 is pressed by the other roller 9 and the pair of feed rollers 8, 9 pinch the band.Band To explain the effect of increasing the pressing force of the pair of feed rollers 8゜9 when pulling back, the band passes through a guide arch (not shown) outside the packing machine main body or manually wraps the object to be packed, and then returns to the packing machine. When the leading end of the band is fed into the main body and reaches a predetermined position, the right press 20 is pushed up by the press cam 40 and grips the leading end of the band, and the pair of feed rollers 8 and 9 reverses to start pulling the band back. At this time, the pair of feed rollers 8
, 9, the right press 20 is pushed up by the press cam, and the right press arm quartet 2
7 rotates in the direction of the arrow in FIG.
A press shaft 23 fixed to the press shaft 23 also rotates in the direction of the arrow in the figure. As a result, the shaft spring 24 inserted and fixed to one end of the press shaft 23 pushes up the adjuster 19, and the main shaft 41 is strongly rotated counterclockwise in FIG. Although the force is further increased compared to the normal rotation due to only 36, since the adjuster 19 is in contact with the stopper 1, the main shaft 41 does not rotate indefinitely, and when the height of the stopper 1 is high, it rotates slightly. , when the height of the stopper 1 is low, it rotates greatly. In other words, the height of the stopper 1 is adjusted depending on the hardness and other properties of the band used, and the cutting allowance of the band that occurs when it slips.For hard bands, the height of the stopper 1 is lowered. It is also possible to increase the pressing force of the upper roller and the degree of biting into the band. In addition, the stopper 1 can also be provided above a portion that faces the rotation locus of the adjuster 19 and protrudes from the main shaft 41 toward the machine frame 15. [Effects] As described above, the present invention has a simple configuration in which a convex strip is formed on the circumferential surface of one of the rollers and the main roller, and a stopper is provided facing the rotation locus of the adjuster. This makes it possible to keep the clamping force of the pair of feed rollers on the band constant. This prevents the band from being strongly rubbed when the feed roller is idling, and prevents the band from being strongly rubbed inside the band shooter.
Or, even if band clogging occurs in the band welding and cutting devices under the slide table, or in the band guide arch outside the packing machine body, band clogging may occur without scraping or nipping of the band. If you pull out the band from that part, you don't have to cut off the band tip (you can reuse it as is.) Also, the device has a device that increases the pressure on the band by both rollers when pulling the band back, compared to when feeding the band. Also, it is possible to adjust the extent of the protrusions into the band and the pressing force thereof, thereby preventing damage to the band due to idle rotation of the pair of feed rollers.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a front view of main parts, FIG. 2 is a side view, and FIG. 3A is a perspective view of the feed roller section, and FIG. B) is a partial cross section of the feed four-ra section.
4(A) is an exploded perspective view showing the feed roller portion, FIG. 4(B) is an exploded perspective view showing the band tightening device portion, and FIG. FIG. 5(A) is a perspective view showing the entire device, and FIG. 5(B) is an exploded perspective view of a band welding mechanism and a mechanism for increasing the band pressing force during reverse rotation. 1... Stopper, 5... lEi 0 axis p 6...
・Band shooter 18...Upper roller, 9...
- Main roller, 18... Convex strip.

Claims (1)

[Scope of Claims] One roller of a pair of feed rollers is supported on an eccentric shaft protruding from a main shaft, and one end of an adjuster inserted and fixed to the main shaft is rotated to rotate the main shaft. In a packaging machine having a mechanism for pressing one roller against the other roller connected to a drive mechanism, a convex strip is formed on the circumferential surface of the one roller, and the said roller is pressed in the direction of pressing one roller against the other roller. A band supply/tightening device for a packaging machine, characterized in that a stopper is provided facing the rotation trajectory of an adjuster.