JPH10101019A - Packing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably brake a rotation of a band reel except at the time of feeding out a band to suppress an overrun phenomenon as much as possible and also simplify and facilitate refill and replacement of the band. SOLUTION: A brake device 20 is added to a band reel 10, wherein the device 20 includes a brake member 22 with a pair of brake pads 27, 27 pressed against outer peripheral end faces 12a, 12a of the band reel 10, a pair of left and right swing arms 21A, 21B with base ends 21a, 21a pivoted to a position eccentric from a rotation axial line O of the band reel 10 in a body frame 2, and a brake canceling mechanism 25 for swinging the swing arms 21A, 21E in a direction where the brake pads 27, 27 come farther from the outer peripheral end faces 12a, 12a by utilizing tension working to the band B, when a band E is fed from the band reel 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention automatically or semi-automatically wraps a tape-shaped band made of a thermoplastic resin such as polypropylene around a packaged object, and welds and bonds the polymerized portion to form a band. Regarding the packing machine that was able to.

[0002]

2. Description of the Related Art In order to improve the efficiency and labor saving of packing work, a tape-shaped band made of a thermoplastic resin is wrapped around an object to be packed, and then the band is tightened.
A packing machine that heats the overlapped portion between the front end and the rear end of the band, press-bonds the melted portion and cuts the rear end automatically or semi-automatically has already been practically used. Has been

In such a packing machine, usually, a band reel loaded with a band coil composed of a winding band is provided in a main body frame having a work table on which an object to be packed is placed, and further, the band reel is mounted on the band reel. In order to prevent the loaded band from being disturbed or loosened, a friction braking type brake device is provided for stopping the rotation of the band reel except when the band is sent out.

[0004] As a conventional example of the brake device, a brake wheel is mounted on a flange on one side of a band reel so as to rotate integrally therewith, and a brake band is wound around the outer periphery of the brake wheel. A braking force for stopping the rotation of the band reel is obtained by urging with a spring or the like so as to press against the wheel, and the braking force is obtained by loosening the brake band against the urging force of the spring or the like. Some of them are eliminated.

[0005]

However, the brake device for a band reel provided in a conventional packing machine has the following problems. That is, since the brake band contacts the outer periphery of the brake wheel in an arc shape, a large contact area can be obtained, but the pressing force per unit area is small, and the pressing direction is always in the radial direction (direction perpendicular to the tangent line). Therefore, unless the urging force of the brake band is considerably increased, it is difficult to obtain a sufficient braking force. Therefore, if the band reel is rapidly rotated at the time of sending out the band, an overrun phenomenon in which the band reel rotates by inertia even after the end of the sending out occurs, and the band loaded on the band reel is disturbed or loosened, There was a problem that it would hinder the next band delivery.

In addition, the braking force of the brake device acts on only one side of the band reel due to its structure. Therefore, the overrun phenomenon is liable to occur in this point, and the brake band is partially released even when the band is sent out. As a result, the band may not be delivered smoothly due to the frictional force of the contact portion.

In addition to the above, in a conventional packing machine, when refilling or replacing a band, the brake band or the like of the brake device is usually removed, the band reel is pulled out from the main body frame in the axial direction, and one side flange thereof is provided. , And load a new band coil.
The one-side flange is attached, the band reel is pushed in the axial direction, and the brake band and the like are reassembled, but when the band is replaced or replaced, the brake device needs to be disassembled and reassembled. So
There was also a problem that work such as replacement and replacement of the band was troublesome and troublesome.

The present invention has been made in view of such a problem, and an object of the present invention is to relatively rotate the band reel except when sending out the band, while having a relatively simple configuration. It is an object of the present invention to provide a packing machine which can suppress an overrun phenomenon and the like as much as possible and can easily and easily carry out replacement and replacement of a band.

[0009]

In order to achieve the above-mentioned object, a packing machine according to the present invention basically has a band reel disposed in a main body frame having a work table on which an object to be packed is placed, A friction braking type brake device is provided for stopping the rotation of the band reel except when the band is sent out.

The brake device includes a brake member disposed in parallel with a rotation axis of the band reel and pressed against an outer peripheral end surface of a flange of the band reel, and swings at both ends of the brake member. A pair of left and right swing arms whose distal ends are connected and whose base ends are eccentrically mounted on the main body frame at positions eccentric from the rotation axis of the band reel, and the band is extended from the band reel. A brake release mechanism for swinging the swing arm in a direction in which the brake member moves away from the outer peripheral end surface by using tension acting on the band.

In a preferred aspect of the present invention, the band reel is detachable from the main body frame in a radial direction, and both ends of the reel shaft are provided with groove-shaped bearing portions provided in the main body frame. The band member is mounted and deployed in the main body frame, and when mounted and deployed in this manner, the brake member is pressed against the outer peripheral end surfaces of both flanges of the band reel.

In another aspect, the swing arm is constantly urged upward so as to press the brake member against the outer peripheral end face portion of the band reel located below the rotation axis. In a preferred aspect of the packing machine according to the present invention having the above-described configuration, when the band reel is mounted on the main body frame by rolling the band reel or the like, the outer peripheral end surfaces of both flanges of the band reel come into contact with the brake. While being brought into contact with the member, the swing arm is pressed upward by a biasing force of, for example, a spring or the like.

As a result, the brake member is brought into pressure contact with the outer peripheral end face, and a braking state is achieved in which the rotation of the band reel is stopped by frictional force therebetween. When the band is sent out, the band is fed out from the band reel while being guided by the brake release mechanism. At this time, the braking release mechanism uses the tension acting on the band to swing the swing arm in a direction (downward) in which the brake member moves away from the outer peripheral end surface, whereby the braking state is released. The band reel is smoothly rotated in the band feeding direction.

When the feeding of the band is completed, no tension acts on the band, so that the swing arm is swung in a direction opposite to the sending direction by an urging force of a spring or the like. The brake member comes into pressure contact with the outer peripheral end surfaces, and a frictional force therebetween causes a braking state in which the rotation of the band reel is stopped.

In this case, since the base end of the swing arm is pivotally mounted on the main body frame at a position eccentric from the axis of rotation of the band reel, the pressing direction of the brake member against the outer peripheral end surface is as follows. In addition, since the brake member is not in the radial direction but in the direction in which the brake member bites into the outer peripheral end surface, the rotation of the band reel can be reliably stopped, and the overrun phenomenon can be effectively prevented. As a result, the band loaded on the band reel is less likely to be disturbed or loosened, and the next band feeding can be smoothly performed.

Further, the braking force of the brake device is:
Due to its structure, it acts on both flanges of the band reel, so that also in this point, the braking force acts on the band reel stably and without bias, and the rotation of the band reel can be reliably prevented, and the overrun can be prevented. The phenomenon can be prevented more effectively. Further, since the brake member can be completely separated from the outer peripheral end face when the band is sent out, the band can be sent out more smoothly than the conventional one.

On the other hand, when the band is replaced or replaced, the band reel is lifted in the radial direction, for example, upward without any change to the brake device, and both ends of the reel shaft are formed into groove-shaped bearing portions. And then roll it out, remove it to the outside, remove the flange on one side, load a new band coil, attach the flange on the one side in the reverse order to the above, roll the band reel, etc. Then, both ends of the reel shaft are dropped into groove-shaped bearing portions provided in the main body frame. As a result, the band reel is mounted on the main body frame and returns to the above-described braking state.

Thus, in the packing machine of the present invention,
Despite having a relatively simple configuration, the rotation of the band reel can be reliably stopped except when the band is sent out, and the overrun phenomenon can be suppressed as much as possible. However, since no changes are required to the brake device, the replacement and replacement of the band can be performed easily and easily.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 schematically show an embodiment of the packing machine according to the present invention. The illustrated packing machine 1
At the lower part of the main body frame 2 having the work table 4 on which the article to be packed W is placed, four columns 6 with casters 7 are provided, and as shown in FIG. In addition, a band reel 10 loaded with a band coil BC is mounted and provided.

Between the band reel 10 and the work table 4, the rotation of the band reel
Brake release mechanism 25 for stopping except when sending out
And a pair of positioning guide rollers 4 for feeding and tightening the band B.
1, a band sending and tightening mechanism 40 including a driving roller 43 and a pressing roller 44 selectively pressed against the same, and a band sent out by the band sending and tightening mechanism 40 and tightened around the article W to be packed. The overlapping portion between the front end portion and the rear end portion of the band B is heated, and the molten portion is pressed and cooled and joined, and the band B
End processing unit 5 adapted to cut the rear end of
0 is provided.

The packing machine 1 of the present embodiment is of a semi-automatic type and does not have a pool device for temporarily storing the band. The band B is fed out from the reel 10, and the band B is fed out onto the guide groove 5 of the work table 4 via the band end processing unit 50 by a length corresponding to the feeding length,
An operator wraps the band B sent out around the outer periphery of the article to be packed W, and inserts the tip of the band B into the band end processing unit 50.

The band reel 10 includes a reel shaft 11 serving as a rotation support shaft, and a pair of left and right disk-shaped flanges 1 fitted around the left and right ends of the reel shaft 11.
As shown in FIG. 2, the left and right ends of the reel shaft 11 have a pair of left and right horizontal members 8, 8 are provided on rolling guide plates 14 and 14 serving as guide rails for inserting and removing the band reel 10 projecting upward from the upper surfaces 8a and 8a of the lateral members 8 and 8, respectively. Rectangular locking groove 1
4a, the left and right lateral members 8,
8 on the upper surfaces 8a, 8a.

Therefore, the left and right locking grooves 14a, 1
4a and the upper surfaces 8a, 8a of the lateral members 8, 8 on which the left and right ends of the reel shaft 11 are mounted,
Although the rotation of the reel shaft 11 and the removal of the fitting in the vertical direction are permitted, a groove-shaped bearing portion for preventing the reel shaft 11 from moving back and forth is formed, and the band reel 10 has a diameter (the waist circumference) relative to the main body frame 2. ) Direction.

On the other hand, as can be clearly understood by referring to FIG. 3 in addition to FIGS. 1 and 2, the brake device 20 has outer peripheral end faces 12a, 12a of the disc-shaped flanges 12, 12 of the band reel 10. A crosspiece made of an elastic material such as rubber and having a substantially crescent-shaped cross-section and having a pair of left and right brake pads 27 and 27 attached to the band reel 10 is disposed in parallel with the rotation axis O of the band reel 10. A brake member 22 is connected to and fixed to the left and right ends of the brake member 22 at its left and right ends.
a, 21a of the band reel 10 in the horizontal members 8, 8 disposed below the main body frame 2.
A pair of left and right swing arms 21A and 21B pivotally mounted by pins 30 and 30 at eccentric positions from the rotation axis O (center axis of the reel shaft 11) as described later, and the band reel 10 to the band The brake pads 27, 27 (brake member 22) are connected to the outer peripheral end face 12 by utilizing the tension acting on the band B when the band B is fed out.
a, 12a.
And a brake release mechanism 25 for swinging the 1B.

Here, the swing arms 21A, 21B
As shown in FIG. 1, the base ends 21a, 21a of the base members 21a, 21a on the outer surfaces of the lateral members 8, 8 are shifted leftward from a vertical line Cy passing through the rotation axis O of the band reel 10 by α.
In addition, the pins 30 are rotatably supported by the pins 30 and 30 implanted and fixed at a position spaced apart by β from the horizontal line Cx passing through the rotation axis O. The swing arms 21A and 21B are respectively connected to the swing arms 21A and 21B.
B and the pin 31-
The outer peripheral end surfaces of the flanges 12, 12 located below the rotation axis O of the band reel 10 by the tension coil springs 29, 29 stretched between the cores 32, 31-32. 12a, 1
It is constantly urged upward so as to press against the portion 2a.

The brake release mechanism 25 provided in the brake device 20 includes a pair of left and right side portions 23b, 23, the lower ends of which are fixed to the brake member 22.
c, and a roller support member 23 having an inverted U-shape formed by an upper side portion 23a connecting them,
The upper side portion 23a of the roller support member 23 so as to bridge in a left-right direction between the thread-shaped displacement band guide roller 34 rotatably fitted to the upper side portion 23a of the third member 3 and the horizontal members 8, 8. And a bobbin-shaped localization band guide roller 36 rotatably fitted to a support shaft 35 erected on the main body frame 2 side at a lower side, and is fed out from the band reel 10. The band B is wrapped around the upper part of the displacement band guide roller 34 and is wrapped around the lower part of the stereotactic band guide roller 36, and is guided to the band sending and tightening mechanism 40. .

In the packing machine 1 of the present embodiment having the above-described configuration, the band reel 10 loaded with the band coil BC rolls the reel shaft 11 on the rolling guide plates 14, 14. The protrusions at both left and right ends are formed on the upper surfaces 8 of the locking grooves 14a, 14a and the lateral members 8, 8.
a and 8a, which are mounted in the main body frame 2 by being dropped into a bearing portion. At the time of mounting and mounting, the left and right flanges 12, 12 of the band reel 10 are mounted.
Outer peripheral end surfaces 12a, 12a of the left and right brake pads 27, 2 attached to the brake member 22.
7 and the swing arm 21
A and 21B are pushed downward against the urging force of the tension coil springs 29 and 29 to be swung.

Thus, the outer peripheral end faces 12a, 12a
The brake pads 27, 27 are brought into pressure contact with each other, and the frictional force therebetween causes a braking state in which the rotation of the band reel 10 is stopped. When the band B is sent out, the band B is fed out from the band reel 10 while being guided by the displacement band guide roller 34 and the localization band guide roller 36 of the brake release mechanism 25. At this time, the tension applied to the band B by the displacement band guide roller 34 is
At a position from the position shown by the imaginary line to the position shown by the solid line,
A, 21B are pivoted downward so that the brake pads 27, 27 move away from the outer peripheral end surfaces 12a, 12a in the direction indicated by arrow Q in FIG. 4, thereby releasing the braking state. Thus, the band reel 11 is smoothly rotated in the band feeding direction.

When the feeding of the band B is completed, no tension acts on the band B, so that the swing arms 21A and 21B are connected to the tension coil springs 29 and
The urging force by 29 causes the brake pad 27 to be swung in the opposite direction (upward) to the direction at the time of sending out, whereby the brake pads 27, 27 again press against the outer peripheral end faces 12a, 12a, and the frictional force between them Then, the band reel 10 is brought into a braking state in which the rotation of the band reel 10 is stopped.

In this case, the swing arms 21A, 21B
Since the base ends 21a, 21a of the brake pads 27, 27a are mounted on the main body frame 2 at positions eccentric from the rotation axis O of the band reel 10, the brake pads 27, 27
The pressing direction of the outer peripheral end surfaces 12a, 12a with respect to the outer peripheral end surfaces 12a, 12a is not a radial direction, and as shown by an arrow P in FIG.
The band reel 1
0 can be reliably stopped, and the overrun phenomenon can be effectively prevented. This makes it difficult for the band B loaded on the band reel 10 to be disturbed or loosened, so that the next band delivery can be smoothly performed.

The braking force of the brake device 20 acts on both the left and right flanges 12, 12 of the band reel 10 because of its structure. Acting evenly, the rotation of the band reel 10 can be reliably stopped, and the overrun phenomenon can be effectively prevented. Further, when the band B is sent out, the brake pads 27, 27 can be completely separated from the outer peripheral end faces 12a, 1a, so that the band B can be sent out more smoothly than the conventional one.

On the other hand, when replenishing and replacing the band B,
The band reel 10 is lifted radially upward without any modification to the brake device 20 and the left and right projecting portions of the reel shaft 11 are engaged with the locking grooves 1.
4a, 14a and the upper surface 8a, 8a of the lateral member 8, 8 is removed from the groove-shaped bearing portion.
Rolls 4 and 14 are taken out, the one-side flange 12 is removed, a new band coil BC is loaded, and the one-side flange 12 is attached in the reverse order to the above, and the band reel 10 is rolled. The reel shaft 11
Are dropped into groove-shaped bearing portions formed by the locking grooves 14a, 14a and the upper surfaces 8a, 8a of the lateral members 8, 8. As a result, the band reel 10 is mounted and disposed in the main body frame 2 and returns to the above-described braking state.

As described above, in the packing machine of the present invention,
With a relatively simple configuration. . However, the rotation of the band reel 10 can be reliably stopped except when the band B is sent out, and the overrun phenomenon and the like can be suppressed as much as possible.
Even when the band B is refilled or replaced, the brake device 20
Does not require any modification, the replacement and replacement of the band B can be performed easily and easily. In addition,
The present invention is not limited to the above embodiments, and various design changes can be made without departing from the spirit of the present invention described in the claims.

For example, in the above-described embodiment, the brake pads 27, 27 are attached to the outer peripheral end surface 12 of the band reel 10 below the rotation axis O.
a, the swing arm 21
A and 21B are always urged upward by the extension coil springs 29, 29, but the present invention is not limited to this, and the brake pads 27, 27 are placed above the rotation axis O of the band reel 10. The outer peripheral end surfaces 12a, 12a may be pressed into contact with each other. In this case, the tension coil springs 29, 2
It is also possible to use only the gravitational force without using 9 to make contact. By appropriately selecting the material and shape of the brake member 22, the brake pad 27,
27 may be omitted.

[0035]

As will be understood from the above description, the packing machine according to the present invention has a relatively simple structure, but can reliably stop the rotation of the band reel except when the band is fed. An excellent effect is obtained that the overrun phenomenon and the like can be suppressed as much as possible, and the replacement and replacement of the band can be performed easily and easily.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an entire configuration of an embodiment of a packing machine according to the present invention.

FIG. 2 is a cutaway side view of a main part as viewed from the direction of arrow II in FIG. 1;

FIG. 3 is a partially exploded perspective view of a band reel and a brake device of the packing machine shown in FIG. 1;

FIG. 4 is a partially enlarged view used for describing the operation of the brake device of the packing machine shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packing machine 2 Main body frame 4 Work table 10 Band reel 11 Reel shaft 12 Flange 12a Outer peripheral end face 14 Rolling guide plate 14a Locking groove (bearing part) 20 Brake device 21A, 21B Swing arm 22 Brake member 25 Braking release mechanism W Packaged object B band O Band reel rotation axis

Claims (3)

[Claims] 1. A work table 4 on which an article W to be packed is placed.
A band reel 10 is provided in a main body frame 2 having a frictional braking type brake device 20 for stopping the rotation of the band reel 10 except when the band B is sent out. Reference numeral 20 denotes an outer peripheral end surface 12 of the flanges 12 of the band reel 10.
a brake member 22 disposed in parallel with the rotation axis O of the band reel 10 pressed against the a and 12a, and a swinging distal end connected to both ends of the brake member 22; A pair of left and right swing arms 21A, 21B whose parts 21a are pivotally mounted at positions eccentric from the rotation axis O of the band reel 10 in the main body frame 2.
And the brake member 22 swings the swing arms 21A, 21B in a direction away from the outer peripheral end faces 12a, 12a by utilizing the tension acting on the band B when the band B is unreeled from the band reel 10. A packing machine, comprising: a brake release mechanism 25 for moving. 2. The band reel 10 is detachable in the radial direction with respect to the main body frame 2, and both ends of the reel shaft 11 are grooved bearing portions 14a provided in the main body frame 2. , 14a to be mounted in the main body frame 2 and provided on the outer peripheral end surfaces 12a, 12a of the flanges 12, 12 of the band reel 10.
2. The packing machine according to claim 1, wherein the brake member 22 is pressed against 12 a. 3. 3. The swing arms 21A, 21B are constantly urged upward so as to press the brake member 22 against the outer peripheral end surfaces 12a, 12a of the band reel 10 located below the rotation axis O. The packing machine according to claim 1 or 2, wherein the packing is performed.