JP2002128014A - Cam mechanism in strapping and packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cam mechanism capable of carrying out controls of cutting and deposition for binding a band with a simple construction at a predetermined timing in a strapping and packaging machine. SOLUTION: The cam mechanism strapping and packing machine comprises a right pressing block 30, a left pressing block 32, and a middle pressing block 34 arranged in parallel and brings cams 78, 80, 82 fixed to a cam shaft 84 into contact with cam followers 52, respectively. The cam followers 52 are set in positions outward of an axial center Q of the block members 30, 32, 34 at setting to the right pressing block 30, the left pressing block 32, and the middle pressing block 34, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cam mechanism in a banding and packing machine, and more particularly, to a cam mechanism in a banding and packing machine capable of accurately performing cutting, welding, and the like for binding a band. It is.

[0002]

2. Description of the Related Art In an automatic or semi-automatic banding and packing machine, a band drawn from a band reel is wound around a material to be packed, clamped, subsequently returned to a band supply side, and tightened. At approximately the same time as the cutting, the bound part melted by the heater is pressed by a press. These delicate timings are usually controlled by a cam mechanism.

FIG. 5 shows a conventional banding packing machine.
5 shows a cam mechanism A for controlling operations such as clamping, welding, and cutting of a band tip. In the cam mechanism A, the body portions of the right holding block 2, the left holding block 4, and the middle holding block 6, which reciprocate in the vertical direction, respectively, are movably accommodated in one support block 8 formed of a casting or the like. I have. The support block 8 is supported between the pair of platens 12 and 14 by a screw member 10.
Cam followers 16, 18, and 20 are rotatably supported at one ends of the right holding block 2, the left holding block 4, and the middle holding block 6 via plungers 3, 5, 7, respectively. Further, both ends of a cam shaft 28 on which cams 22, 24, 26 are fixed at predetermined intervals are rotatably supported by the pair of bases 12, 14, respectively. A cam follower 1 attached below the right holding block 2, the left holding block 4, and the middle holding block 6.
6, 18, 20 are assembled so as to be in close contact with the corresponding cams 22, 24, 26 of the cam shaft 28, respectively.

Therefore, in the cam mechanism A, when the cam shaft 28 rotates, the cams 22, 24, 26 rotate together, and further, the force is transmitted to the cam followers 16, 18, 20. Then, these cam followers 16, 18,
20 moves up and down while rotating. As a result, the right holding member 2, the left holding member 4, and the middle holding member 6 move up and down at a predetermined timing, so that a mechanism (not shown) clamps, welds, cuts, and the like at the band tip. It is configured to be.

The cam followers 16, 18, 20
Are pulled downward by springs 26, 28, 30 so as not to separate from the state of being in close contact with the respective cams 22, 24, 26.

[0006]

By the way, in such a conventional cam mechanism A, for example, as shown in FIG.
The rotation axis P of the cam follower 16 is
Are located on the same straight line as the axis Q of That is, the cam followers 16, 18, and 20 correspond to the blocks 2, 4, and 4, respectively.
It is attached so as to rotate just below 6.

However, the cam followers 16, 1
When 8, 20 are mounted on the same straight line as the axes of the corresponding blocks 2, 4, 6, when the force is received from the cams 22, 24, 26, the force is transmitted in the vertical direction about the rotation axis P. Will be. Then, when the block members 2, 4, and 6 move up and down, as shown by the arrow B in FIG.
There is a problem in that the block and the cam follower integrally rotate in the horizontal direction when receiving rotational power because of lack of direction. If the block members 2, 4, and 6 rotate in the direction of arrow B in this manner, there is a problem that the pressing portion of the block and the pressing position groove of the slide table are displaced.

[0008] Such a movement of rotation in the horizontal direction can be prevented by separately providing a rotation preventing structure in the cam mechanism A, but in that case, the structure becomes complicated. In view of such circumstances, the present invention provides a cam mechanism in a strapping / packing machine capable of reliably performing band holding when performing control such as cutting and welding for binding a band using a cam mechanism. It is intended to be.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a right holding block, a left holding block, and a middle holding block each having a cam follower at one end, and these three holding blocks are arranged in parallel. Below the block member, a camshaft in which three cams are fixedly arranged in parallel at a predetermined interval is arranged, and by contacting these three cams with the corresponding cam followers, the right pressing member, In a cam mechanism in a banding packing machine for moving a left holding member and a middle holding member up and down at a predetermined timing, when attaching the cam follower to the right holding block, the left holding block, and the middle holding block, Is attached to a position outside the axis of the block member. That.

According to the present invention having such a configuration, when a force is transmitted from the cam follower to each block member, directionality is imparted. Therefore, the force applied in this direction causes the block member to move in the horizontal direction. Rotation is prevented. Therefore, band holding can be reliably maintained.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a main part of a strapping and packing machine provided with a cam mechanism according to an embodiment of the present invention. The outer surfaces of the body portions of the right holding block 30, the left holding block 32, and the middle holding block 34 in this embodiment are formed in a substantially cylindrical shape. Further, the inside of each of these body portions 36, 38, 40 is formed hollow.
Then, as shown in FIG. 2, for example, the left pressing member 32
A spring 46 is incorporated in the hollow portion, and a plunger 48 is slidably inserted below the spring 46. A notch 50 is formed at the lower end of the plunger 48, and a cam follower 52 is rotatably attached to the notch 50 by a shaft 54.

Here, a hole 68 for inserting the shaft 54 is formed in the peripheral surface of the plunger 48, and the hole 68 is formed slightly deviated outward from the center of the plunger 48. ing. That is, as shown in FIG. 3, the hole 68 is formed so as to be deviated outward by the distance of E from the axis Q of the body 38, and the shaft 54 is inserted through the hole 68.
Therefore, the center of rotation of the cam follower 52 is shifted outward from the axis Q of the left pressing member 32 by a distance of E.

As shown in FIG. 2, a pin hole 56 is formed in the body 38 of the left holding block 32, and an insertion hole 62 is formed in the plunger 48. Then, with the plunger 48 inserted into the body 36, the pin hole 56 and the insertion hole 62 are aligned with each other.
The pin 64 is inserted between 62 and the plunger 48 is
It does not fall from 6.

The mounting position of the cam follower 52 has been described using the left holding block 32 as an example.
The right holding block 30 and the middle holding block 34 also
A cam follower 52 is attached at the same position as the left holding block 32. Each body of the right holding block 30, the left holding block 32, and the middle holding block 34 has a single support block 70 made of a casting or the like.
The support block 70 is supported by a pair of bases 74 and 76 by a screw member 72.

Further, the pair of surface plates 74 and 76 include:
A cam shaft 84 is rotatably inserted, and cams 78, 80, 82 and the like are integrally attached to the cam shaft 84 at predetermined intervals. In FIG. 1, reference numeral 86 denotes
A spring 90 provided between the spring stopper 86 and the main body side shaft 88 is hooked by a spring stopper provided on the side surface of each of the blocks 32, 34, 30.
, So that it does not come off.

The cam mechanism in the banding and packing machine according to the present embodiment is configured as described above. The operation of the cam mechanism will be described below with reference to FIGS. First, the camshaft 84 rotates by receiving a driving force from a motor (not shown). As a result, the cams 78, 80 and 82 integrated with the cam shaft 84 rotate together with the cam shaft 84. When the cams 78, 80, and 82 rotate, the corresponding cam followers 52 move up and down according to the shapes of the cams. Then, the right holding block 30, the left holding block 32, and the middle holding block 34 move up and down along the axis Q, and at the timing, gripping, cutting, welding, crimping, and the like of the band tip are performed. ing.

On the other hand, when the right holding block 30, the left holding block 32, and the middle holding block 34 move up and down at a predetermined timing, the cam followers 52 attached to the lower ends thereof, as shown in FIG. Since the cam followers 52 are biased toward the outer position by the distance of E, these cam followers 52 always face in a fixed direction. Due to the action of this force, even if a rotating force acts, a force trying to return in this direction always acts, and blocks such as the left holding block 32 simply move up and down.

Therefore, with this cam mechanism, the band can be reliably pressed at the position where the block and the slide table are pressed. In addition, the engagement of the cutting blade formed by the movement of the middle pressing block 34 and the right pressing block 30 does not deteriorate. that's all,
Although one embodiment of the present invention has been described, the present invention is not limited to the above embodiment. For example, in the above embodiment, the outer shape of the body of the right holding block 30, the left holding block 32, and the middle holding block 34 is cylindrical,
These can be applied to other shapes such as a rectangular tube shape.

[0019]

As described above, according to the cam mechanism of the banding packing machine according to the present invention, the mounting position of the right follower block, the left retainer block, and the middle retainer block can be obtained simply by shifting the mounting position of the cam follower. Since rotation in the horizontal direction can be prevented, the band can be reliably pressed between the blocks and the pressing position of the slide table. Further, the structure is simple.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a main part of a cam mechanism in a banding packing machine according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a part of FIG. 1;

FIG. 3 is a side view showing an assembled state of the cam and the cam follower according to the embodiment.

FIG. 4 is a front view showing the cam mechanism according to the embodiment.

FIG. 5 is an exploded perspective view of a cam mechanism in a conventional strapping packing machine.

FIG. 6 is a side view showing an assembled state of a cam and a cam follower in a conventional cam mechanism.

[Explanation of symbols]

 Reference Signs List 30 right holding block 32 left holding block 34 middle holding block 52 cam follower 78, 80, 82 cam 84 cam shaft Q axis center

Continued on the front page (72) Inventor Mitsuru Sato 2-1-19 Hinode, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Strawpack Co., Ltd. Kawasaki Plant (72) Inventor Kenichi Toda 2-1 Hinode, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture 19 Strapak Co., Ltd. Kawasaki Plant F-term (reference) 3E052 CA01 GA02 HA01 KA20 LA08 3J030 EA02 EA22 EC06

Claims (1)

[Claims] 1. A right holding block, a left holding block, and a middle holding block each having a cam follower at one end thereof are arranged in parallel, and three cams are provided below these three block members at a predetermined interval. By disposing cam shafts fixed in parallel and bringing these three cams into contact with the corresponding cam followers, the right holding member, the left holding member, and the middle holding member are moved up and down at a predetermined timing. In the cam mechanism in the banding packing machine, in attaching the cam follower to the right holding block, the left holding block, and the middle holding block, the cam follower is attached to a position outside the axis of the block member. A cam mechanism in a banding packing machine, characterized in that: