JPH0451124Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a packaging machine equipped with an arm-type band tightening mechanism.

[Conventional technology]

Conventionally, this type of packaging machine has a main roller 12 and an upper roller 13, as shown in FIG.
After the tip of the band B fed into the arch is fixed by the right press below the slide table (not shown) by normal rotation of the main roller 12 and the top roller 13, the feeding end of the band B is pulled back and The trochanter 10 at the tip of the lever 9 provided on the arm 1 slides into contact with the cam surface of the tension cam 11 and ascends the mountain while rotating, so that the arm 1 resists the bias of the first spring 5 and moves in the band tightening direction. to move to. At the same time, the tip of the adjuster 2 comes into contact with the pin 4 inserted through the jaw 3 which is supported above the arm 1 and is urged in the opening direction by the second spring 6.
The adjuster 2 also starts sliding together with the arm 1 due to the pin 4, but when the tip of the adjusting screw 18 comes into contact with the pin 20, which is a locking member of the lever 19 supported on the same axis as the adjuster 2, the lever 19 The adjuster 2 connected via the spring 7 of No. 3 rotates the pin 4 to the left in the figure, and the jaw 3 thereby clamps the band between the guide grooves 8.

Even after band B is gripped by JIYO 3,
The adjuster continues to slide together with the arm 1, and after the band B is strongly tightened, its supply side is fixed by a left press (not shown), and the band supply side is cut, so that the overlapping surface of the band tip and the band supply side is Welded. Incidentally, the drag force of the springs is smaller in the order of first spring 5>third spring 7>second spring 6.

[Problem that the invention attempts to solve]

In the above device, after the band is tightened, the arm 1 gradually slides and returns to its original position as the tension cam 11 rotates, but the band B is held by the jaw 3 in the direction of the tension cam 11 by the spring 7 of the adjuster 2. The biasing continues until the arm 1 is released due to the resistance of the spring 6 that biases the jaw 3, that is, just before the arm 1 contacts the inlet of the band shooter 17.

In addition, the main roller 12 and the upper roller 1
3 continues to hold the band B, so the band B is held between the jaw 3, the guide groove 8 and the pair of rollers 1.
When the arm 1 returns while being held between the arms 2 and 13, it will bend inside the band shooter 17, or it will jump out of the band shooter 17, causing the band shooter 1 to
7 will be caught between the inlet and arm 1.

For this reason, the band cannot be fed into the unillustrated arch on the packing machine body or outside the machine body by a pair of rollers for the next packing preparation, or the band tip is bent and the band is not completely finished. This resulted in a situation where welding was not possible.

Conventionally proposed methods to solve this problem include rotating the main roller in synchronization with the return of the arm to more quickly feed the band into the arch or outside the main body;
There is a method in which knurling is carved into the main roller and the band is forcibly pulled out by the strong frictional force generated between the knurling and the band surface, but in the former method, the main roller detects the return of the arm and Since a limit switch that operates to instruct the forward rotation of the band switch is required, it not only complicates the structure and manufacturing process of the device, but also increases the manufacturing cost. Since the band held between the arms is forcibly pulled out, the band is fed into the arch in a broken state, resulting in damage to the band, clogging of the band within the arch, and poor adhesion. ing. Furthermore, it must be said that the fundamental problem with these prior art techniques is that no countermeasures can be taken if the band is strongly caught in the guide groove due to the sliding movement of the arm.

Also, as proposed in the past, a small cam separate from the tension cam was provided on the cam shaft that rotates the tension cam, and when the band tightening was completed, the tip of the interlocking rod connected to the crank that slid by this small cam was By making abutment against the locking rod attached to the eccentric shaft of the main roller or upper roller, and creating a gap between the main roller and the upper roller when the band is tightened, the band is prevented from bending inside the band shooter. Then,
This prevents the band from being pinched between the band shooter inlet and the arm.

According to this method, it is possible to prevent the band from bending inside the band shooter, but it does not solve the fundamental problem of not being able to eliminate the situation where the band is still held by the jaw. It becomes impossible to feed the band into the arch in preparation for packaging. This device also has crank,
Since it has a complicated structure in which the interlocking rod and locking rod are operated in synchronization, the manufacturing process is also complicated.

[Purpose of invention]

The present invention was developed to eliminate the drawbacks of the prior art described above, and its purpose is to force the jyo to grasp the band as soon as the arm returns to its original position after the jyo finishes tightening the band. By quickly releasing the band and letting the band escape toward the supply end, the band is prevented from being bent in the band shooter, jumping out of the band shooter, and being pinched in a bent state between the arm and the band shooter inlet, Another object of the present invention is to provide a packing machine that can quickly and accurately supply bands when feeding bands into an arch in preparation for the next packing.

[Structure of the idea]

In order to achieve the above object, the present invention uses a lever 29 whose tip is in contact with the cam surface of the cam 11, which rotates from the lowest point of the cam surface, which is the original position, to the highest point, and then to the lowest point, which is the original position, to make a constant stroke. A band guide groove 28 is provided in the upper part of the arm 21 which slides and automatically returns by the first spring 25, and a jaw 23 grips the band supply end between the band guide groove 28 and the guide groove.
The upper end of the adjuster 22, whose lower end is slidably supported on the jaw 23, is fixed to the jaw 23. jiyo 23
in the releasing direction, and the adjuster 22
The locking member 37 that prevents the adjuster 22 from sliding can be adjusted to move along the sliding locus of the adjuster 22 via the third spring 27 which is smaller than the drag force of the first spring 25 and larger than the drag force of the second spring 26. In the packaging machine having a band tightening mechanism provided in the above, an adjuster lever 32 is provided projecting from the adjuster 22,
Connect the tip of this adjuster lever to the arm 21.
The cam 11 is positioned on the cam surface just before the tip of the lever 29 of the arm in the direction of rotation of the cam 11 (arrow in FIG. The cam surface is characterized in that the cam surface from the highest point to the lowest point in the direction of the return action of the arm is formed into an extremely downward slope.

[Effect of invention]

As the cam 11 rotates from the lowest point to the highest point on the cam surface, which is the original position, the trochanter 30 at the tip of the lever 29 begins to ascend the mountain of the cam 11, and the arm 21 supplies the band against the bias of the first spring 25. When the adjuster 22 starts sliding in the end direction, the adjuster 22 also slides according to the arm 21, and when the side surface of the adjuster 22 comes into contact with the protrusion 37, which is a locking member, the biasing force of the third spring 27 is transferred from the second spring 26. Because it is large, the sliding movement of the adjuster 22 that was following the arm 21 is prevented,
The adjuster 22 does not follow the arm 21.
moves in the direction opposite to the band supply end direction relative to the arm 21 that slides toward the band supply end direction, and presses the pin 24 in the recess at the upper end of the adjuster 22 in the direction of the guide groove 28, and the arm 2
A jaw 23 rotatably supported on the upper end of the band B rotates and grips the band B between it and the guide groove 28.

When the jaw 23 grips the band B between the guide grooves 28, the adjuster 22, while being locked by the projection 37 serving as a locking member, moves together with the arm 21 toward the band supply end against the bias of the third spring 27. Continuing the sliding motion and tightening the band B, the trochanter 30 is connected to the cam 11.
Tightening is completed when you climb up the mountain and reach the highest point. During this time, the tip of the adjuster lever 32 does not come into contact with the cam surface because the tip of the arm lever 29 is always located at a higher cam surface. The tip of the adjuster lever 32 is connected to the lever 29 of the arm.
is at a position higher than the tip of the lever 29 of the arm, that is, at a high position on the cam surface, only when the cam 11 is about to descend the cam surface of the extremely descending slope from the highest point to the lowest point, which is the original position. , the tip of the adjuster lever 32 is pressed against the highest point of the cam 11, and the adjuster 22 is pressed against the highest point of the cam 11.
While returning in one direction, it is pressed in the direction of the band supply end. At this moment, the adjuster 22 slides toward the band supply end relative to the arm 21, and the pin 2 in the recess at the upper end of the adjuster 22
4 is pushed in the direction away from the guide groove 28, and the jaw 23 releases its grip on the band B.

[Explanation of Examples]

Hereinafter, details of the present invention will be explained based on illustrated embodiments.

1 to 3, 12 is a main roller that supplies and pulls back the band B by rotation of a drive motor (not shown); 13 is a main roller 12;
This is an upper roller that slides in contact with and rotates to sandwich the band B.

The arm 21 is supported by a shaft 34,
The outlet of the guide groove 28 provided in this arm 21 communicates with the inlet of the bunt shooter 17. As shown in FIG. 5, the band shooter 17 consists of a feed shooter 48 having a generally U-shaped cross section and a shooter cover 49 that covers the feed shooter 48. Band shooter 1
7 has an outlet facing the right press 15 and an inlet facing the outlet of the guide groove 28 of the arm 21, and has a hole in the center, through which the upper end of the main roller 12 is exposed. Further, the shutter cover 49 does not cover the entire length of the feed shutter 48, but covers the upper roller 13 and the guide groove of the arm 21.
There is no shutter cover 49 between the feed shutter 48 and the feed shutter 48, and the upper surface of the feed shutter 48 is open. Arm 21
A jyo 23 is supported by a shaft at the upper end, and this jyo 23
A pin 24 is inserted through the lower end of. This pin 24 is slidable within a hole 47 formed above the guide groove 28 provided in the arm 21.
Further, a lever 29 is provided on the arm 21 so as to protrude substantially perpendicularly to the arm 21, and a rotor 30 that slides and rotates on the cam surface of the cam 11, which will be described later, is supported at the tip of the lever 29. On the side of 21, there is a first spring 25 with one end attached to the machine frame 31.
The other end is locked and biased toward the cam 11.

Reference numeral 11 denotes a cam, which has a bowl shape as a whole and has a cam surface consisting of a convex portion and a concave portion formed along the opening edge thereof, and is connected to a cam shaft 35 and rotates in synchronization with the cam shaft 35. The cam surface is formed into an extremely downward slope that extends at a small angle from the highest cam surface that produces the maximum sliding distance of the arm to the lower cam surface in the direction of the return action of the arm (see Fig. 1). and Figure 3).

The adjuster 22 is connected to the shaft 3 like the arm 21.
4 on the machine frame 31, and are arranged in parallel in front of the arm 21 in FIG. The upper end of this adjuster 22 has a concave shape, and the pin 24 is locked in this concave portion.

An adjuster lever 32 is provided on the adjuster 22 and protrudes substantially horizontally. This adjuster lever 32 is somewhat shorter than the lever 29, and has a rotor 33 rotatably supported at its tip. Trochanter 33
is located immediately in front of the trochanter 30 of the arm 21 in the direction of rotation of the cam 11 as indicated by the arrow in FIGS. 1 and 2. That is, the cam surface of the cam 11 that rotates when the band is tightened contacts only the rotor 30 of the arm 21 and does not contact the rotor 33 of the adjuster 22. Trochanter 33 of adjuster lever 32
is not in constant sliding contact with the cam 11, but when the trochanter 30 descends from the peak of the cam 11, it comes into contact with the cam surface, and when the trochanter 30 begins to climb the cam surface, it separates from the cam surface. That is, arm 21
comes into contact with the cam 11 only when returning.

The adjuster lever 32 includes a second spring 26 and is biased in a direction in which the pin 24 and therefore the jaw 23 release the band. That is, one end of the second spring 26 is hooked to the hook of the first spring 25 of the arm 21, and the other end is connected to a hook on the side surface of the adjuster lever 32. The adjuster 22 is urged by the second spring 26 and the pin 24 inserted through the jaw 23 to follow the sliding movement of the arm 21.

Further, in FIG. 1, in front of the adjuster 22, a rectangular plate 36 is supported on the machine frame 31 by a shaft 34. This plate 36
The plate 36 is provided with a third spring 27 which has one end hooked to a hook of the machine frame 31 and the other end hooked to a projection 37 which is a locking member to be described later.Therefore, the plate 36 is biased toward the cam 11 be done. Note that the drag force of the third spring 27 is larger than the drag (biasing force) of the second spring 26 and smaller than the drag force of the first spring 25.

When each member is at the return completion position shown by the solid line in FIG. 1, the jar 23, which is locked to the adjuster 22 by the spring 29, is released from the guide groove 28.

Further, a protrusion 37 is provided near the connecting portion between the plate 36 and the third spring 27. This protrusion 37 is provided so as to be able to come into contact with the side surface of the adjuster 22 in the band supply end direction.

A locking piece 38 is protruded from the plate 36 at a position substantially on the extension line of the third spring 27, and one end of an interlocking rod 39 is locked to this locking piece 38.

On the other hand, the other end of the interlocking rod 39 is suspended by a wire 40, and is rotatably supported on the tip of a fixed rod 42 at a position somewhat toward the plate 36 from this suspended portion. The upper end of the wire 40, which suspends the interlocking rod 39 at the lower end, is connected to one end of a swinging rod 41, and an adjustment screw 4, which will be described later, is attached to the upper surface of the other end of the swinging rod 41.
The swinging rod 41 is rotatably supported on the tip of a fixed rod 43 fixed to the upper wall 45 of the main body at a position slightly in the direction of the wire 40 from this contact point.

Reference numeral 44 denotes an adjustment screw, the shaft portion of which is male threaded, and this shaft portion is inserted into a through hole drilled in the upper wall 45 of the main body and a nut 46 fixed to the inner surface of the upper wall 45 of the main body. They are screwed together.

The configuration of the present invention is as described above, and its operation will be described next.

The band B, which has now been inserted into the guide groove 28 and is held between the main roller 12 and the upper roller 13, is fed into an arch (not shown) by the rotation of the drive motor. When the tip of the band B that has gone around the inside of the arch reaches the bottom of the slide table 14, the right press 15 is raised by the rotation of the camshaft 35 to fix the tip of the band B, and then the main roller 12 and the upper roller are moved by the rotation of the drive motor. 13 pulls back the band B, thereby sequentially pushing open the flaps and the band B, which escapes from inside the arch, wraps around the item to be packed.

At the same time, as the camshaft 35, that is, the cam 11 rotates, the trochanter 30 at the tip of the lever 29 begins to ascend the mountain of the cam 11 (at this time, the trochanter 33 at the tip of the adjuster lever 32 is still separated from the cam 11).
As a result, the arm 21 starts to slide toward the band supply end against the bias of the first spring 25, and the adjuster 22 also slides along with the arm 21. Immediately after this, when the side surface of the adjuster 22 comes into contact with the protrusion 37, which is a locking member, the biasing force of the third spring 27 is larger than that of the second spring 26, so the adjuster 22 moves the pin 22 in the recess at the upper end of the adjuster 22. is pressed in the direction of the guide groove 28, and the jaw 23, which is supported on the upper end of the arm 21, rotates and grips the band B between it and the guide groove 28.

When the jaw 23 grips the band B between the guide grooves 28, the adjuster 22 is moved toward the band supply end along with the arm 21 against the bias of the third spring 27 while being locked to the projection 37 serving as the locking member. Continuing the sliding movement and tightening the band B, the trochanter 30 is moved to the cam 11.
The tightening is completed when you climb the mountain and reach the highest point. During this time, the tip of the adjuster lever 32 does not come into contact with the cam surface because the tip of the arm lever 29 is always located at a higher cam surface.

Then, the left press 16 is raised by the rotating camshaft 35 to fix the band supply end, and then the cutter below the slide table 14 is moved by the hand B.
The supply end of the band B is cut, and a heater is inserted between the overlapping band tip and the supply end to weld the band B.

While the band is being welded and cut, the trochanter 30 descends from the cam 11, and the arm 21 and adjuster 22 are returned to their original positions by the urging force of the spring 25.

The trochanter 33 of the adjuster lever 32 is the lever 29
It is only when the trochanter 30 of the cam 11 begins to descend somewhat down the extremely descending cam surface of the cam 11 that it is at a position higher than the tip of the lever 29 of the arm, that is, at a higher position on the cam surface, and is pressed against the cam 11. However, due to the pressure contact of the rotor 33 to the cam 11, the adjuster 22 returns toward the cam 11 and is pressed toward the band supply end. At this moment, the adjuster 22 slides toward the band supply end relative to the arm 21. This relative sliding movement of the adjuster 22 causes the pin 24 to move toward the adjuster 22.
The upper end is pushed in the direction away from the guide groove 28, and the jaw 23 releases its grip on the band B. Guide groove 28
As the inner band B is released toward the supply end, the band whose tip side is held between a pair of rollers is bent inside the band shooter, or it jumps out of the band shooter and is bent between the arm and the band shooter inlet. This prevents it from being pinched.

After that, both the trochanter 30 and the trochanter 33 move down the mountain of the cam 11, and the trochanter 30 of the lever 29 moves down the cam 11.
When arm 2 reaches the lowest valley bottom, which is the original position of
1 is completely returned, and the second spring 26 causes the adjuster 22 to return completely just before the rotor 33 of the adjuster lever 32 reaches the lowest bottom of the cam 11.

This completes one process of packaging, but if you want to adjust the tightening strength depending on the type of item to be packed, the first step is to
In the figures and FIG. 4, first, when the head of the adjusting screw 44 is rotated and the tip of the shaft portion presses the swinging rod 41, the swinging rod 41 swings around the bearing portion of the fixed rod 43. The wire 40 is pulled upward, and the interlocking rod 39 swings around the bearing part of the fixed rod 42 to push down the locking piece 38 of the plate 36. As a result, the plate 36 rotates clockwise around the shaft 34 against the bias of the spring 27, and the protrusion 3
7 will be separated from the adjuster 22. Therefore, when the adjuster 22 slides in the tightening direction, the timing at which it comes into contact with the protrusion 37 is delayed, and the timing at which the jaw 23 grips the band B is also delayed, and the strength of band tightening is reduced.

Conversely, if the head of the adjustment screw 44 is rotated to weaken the pressure on the swinging rod 41 by the tip of the shaft, the swinging of the swinging rod 41 will cause the connection between the wire 40 and the interlocking rod 39 (suspension part) descends and the pressure on the locking piece 38 by the interlocking rod 39 weakens, so the plate 36 rotates counterclockwise around the shaft 34 under the urging of the spring 27, and the protrusion 37 moves toward the adjuster 22. Get closer. Therefore, when the adjuster 22 slides in the band tightening direction, the timing at which it comes into contact with the protrusion 37 becomes earlier, and the timing at which the jaw 23 grips the band B also becomes earlier, and the band tightening strength increases.

[Effect of idea]

As described above, according to the present invention, when the band tightening is completed and the arm starts returning, the trochanter of the adjuster comes into pressure contact with the cam, and this pressure contact causes the adjuster to supply the band relative to the arm. It slides toward the end and forcibly releases the grip of the band by the jaws, so when the arm returns, one end of the band is held between a pair of rollers, and the other end of the band is gripped by the jaws. As it is,
It is possible to prevent the band shooter from being bent within the band shooter, jumping out of the band shooter, and being caught between the band shooter entrance and the arm.

In addition, according to the present invention, there is no need to use a limit switch or carve a knurl on the roller to forcefully pull out the band, so the structure is simple.
The manufacturing process is simple and can be manufactured at low cost, and the band will not be damaged or jammed in the arch while being bent.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention. Figure 1 is a side view of the main part, Figure 2 is a front view of the main part, and Figure 3 is a front view of the main part.
The figure is an explanatory view of the operation when the jaw is opened, FIG. 4 is a partial view of the tightening strength adjusting device, and FIG. 5 is a perspective view of the band shooter. FIG. 6 is a diagram showing a conventional band tightening device. 10...trochanter, 11...(tension) cam,
12...Main roller, 13...Upper roller, 14...Slide table, 15...Right press, 16...Left press, 17...Band shooter, 18...Adjustment screw, 19...Lever, 20...
...Pin, 21...Arm, 22...Adjuster,
23... Jiyo, 24... Pin, 25, 26, 2
7... spring, 28... guide groove, 29... lever,
30... Trochanter, 31... Machine frame, 32... Adjuster lever, 33... Trochanter, 34... Shaft, 3
5...Camshaft, 36...Plate, 37...Protrusion, 38...Locking piece, 39...Interlocking rod, 40...
Wire, 41... Swinging rod, 42, 43... Fixed rod, 44... Adjustment screw, 45... Packing machine main body, 4
6...Natsuto, 47...Anabe, B...Band.

Claims (1)

[Claims for Utility Model Registration] A cam that rotates from the lowest point, which is the original position of the cam surface, to the highest point, and then to the lowest point, which is the original position, through a lever whose tip is in contact with the cam surface of the cam, and which moves by a constant stroke, and A band guide groove is provided in the upper part of the arm that automatically returns when the arm is activated in step 1, and a jaw for gripping the band supply end is supported between the guide groove and the upper end of the adjuster, the lower end of which is slidably supported on the jaw. The first spring is fixedly provided, and urges the jaw in the release direction via a second spring having a smaller resistance than the first spring, and the first spring is attached to the sliding locus of the adjuster. A packaging machine having a band tightening mechanism which is provided with a movably adjustable locking member that prevents sliding movement of the adjuster via a third spring that is smaller than the drag force of the adjuster spring and larger than the drag force of the second spring. An adjuster lever is installed protruding from the
The tip of this adjuster lever is positioned on the cam surface immediately in front of the lever tip of the arm in the rotational direction of the cam that causes the arm to slide in the band tightening direction, and the maximum sliding distance of the arm of the cam is A packaging machine characterized in that a cam surface extending from the highest point to the lowest point in the direction of return action of the arm is formed into an extremely downward slope.