JPH08282621A - Packing machine - Google Patents

Abstract

PURPOSE: To obtain a packing machine capable of reducing a possibility of a cutting failure and lowering a production cost of a cutting blade and the like by a method wherein a cutting blade cannot be separated from but surely abutted against a front clamping member at the time of cutting a band. CONSTITUTION: For preventing a cutting blade 50 from separating from a front clamping member 30, a guide member 20 having a separation-restricting surface 22a along the rising-lowering direction of the clamping member 30 and a pressing member 10 is provided on one 10 of them. A ball bearing 34 is provided in the clamping member 30 so as to abut on the separation-restricting surface 22a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing machine adapted to wind a tape-shaped band made of a thermoplastic resin such as polypropylene around an object to be packed and to bond the polymerized portion by fusion bonding. .

[0002]

2. Description of the Related Art A band is sent out in a loop shape around an object to be packed placed on a work table, and then a surplus amount of the sending back is tightened to be wound around an outer peripheral surface of the object to be packed, and then, A heater provided in a band end processing mechanism heats a superposed portion of the front end portion and the rear end portion of the band, presses the melted portion by a press member, simultaneously cools and joins the rear end of the band. Balers designed to cut are already well known.

In such a packing machine, the band edge processing mechanism is basically constructed as described in the specification of Japanese Patent Application No. 5-39796 filed by the present applicant. This will be briefly described below (reference numerals are those in the specification). The band edge processing mechanism (K) is a slide table (67) that is moved back and forth on the lower surface of the article to be packed.
And between the front end and the rear end of the band (B) (overlapped portion)
The intermediate slide member (74) to be inserted into the belt, the heater (64) to be inserted into the overlapping portion at a predetermined timing so as to alternate with the intermediate slide member (74), the front end of the band (B) and The front clamp member (45) and the rear clamp member (56), which are moved up and down at a predetermined timing to hold the vicinity of the rear end portion, and the melt-polymerized portion of the band (B) by pressure bonding. And a press member (55) that is moved up and down by a unit, and is integrally or separately provided on the front surface of the press member (55) that faces the feed direction of the band (B) and rises together with the press member (55). When squeezed, the band (B) pulled out above the pressing member (55) through the band insertion opening (44) provided in the front clamp member (45) is moved forward. Ramp member (45) is adapted to to cut as Oshikiru in cooperation with the cutting blade (5
9) and are provided.

With such a structure, after the band B is sent out so as to be looped around the object to be packed placed on the work table (4), its front end is in front of the slide table (67). Bind with the clamp member (45),
Then, the delivery surplus is pulled back so as to be wound around the outer peripheral surface of the article to be packed, and the rear end portion is held by the slide table (67) and the rear clamp member (56), and then the middle slide member (74). ) Instead of heater (64)
Is inserted into the polymerized portion to heat and melt the front end portion and the rear end portion of the band, and then the heater (64) is retracted, and finally the press member (55) is raised to melt and polymerize the band (B). After crimping, cooling and joining,
The cutting edge (59) of which the rear end is raised together with the press member (55) and the front clamp member (45) [the inner left upper end edge of the band insertion opening (44) of the front clamp member] are pressed (sheared). To be done.

[0005]

In such a packing machine, the band is cut by pressing the cutting blade provided on the press member and the front clamp member as described above. Therefore, if the cutting edge of the cutting blade is not in close contact with the back surface (cutting surface) of the front clamp member when cutting the band, cutting failure may occur, but the cutting blade must be slid relative to the front clamp member. Since a certain amount of play is required between each member, the front clamp member and the cutting blade are worn due to sliding friction, so the cutting blade must always and surely contact the front clamping member. It was difficult and often the band was not cut. If such a cutting failure occurs, the band has already been joined and cannot be redone, and the top plate must be removed and recutting must be performed manually, resulting in a delay in the packaging work and an extremely troublesome situation. .

[0006] Therefore, in order to prevent such defective cutting of the band from occurring easily, in the prior art, for example, the actual cutting method 61-
As disclosed in Japanese Patent No. 14604, there has been proposed one in which the front clamp member and the press member are connected by a spring so that a cutting blade provided on the press member is constantly in pressure contact with the back surface of the front clamp member. There is. However, even if the front clamp member and the press member are connected by the spring as described above, the cutting failure can be somewhat reduced, but the cutting blade is still slightly separated from the back surface (cut surface) of the front clamp member at the time of cutting. However, there is a problem in that some cutting defects occur. In order to avoid this problem, the spring is made strong so that the cutting blade comes into strong pressure contact with the front clamp member. This time, the sliding friction of the cutting blade increases and the cutting operation (elevating operation) is smooth. However, there is a problem that the cutting blade is abraded severely, and a large amount of lubricating oil is required.

Further, in the above publication, the upper end corner portion of the press member is used as a cutting blade, in other words,
The press member and the cutting blade are integrally made of the same metal material, but the press member is made of a material having high thermal conductivity, such as an Al alloy or Cu alloy, so that the fusion-bonded portion of the band can be rapidly cooled. While it is desired to be done,
It is desirable that the cutting blade be made of a material with high wear resistance, slidability, cutability (hardness), etc., such as blade steel, and when the press member and the cutting blade are integrally made of the same material, It is unavoidable that the function of at least one of the press member and the cutting blade is deteriorated.

On the other hand, if the press member and the cutting blade are made separately and the cutting blade is attached to the press member, the press member and the cutting blade can be made of materials suitable for the respective members, so that the above-mentioned problem occurs. Can be resolved. However, if the press member and the cutting blade are separately manufactured, the total manufacturing cost becomes high. In particular, as a cutting blade, as seen in, for example, Japanese Utility Model Laid-Open No. 55-166702, a cutting blade having a complicated shape such as a crescent shape in which the tip is curved or inclined in order to reduce the contact area with the front clamp member. However, although the sliding characteristics and the cutting characteristics are improved, there is a problem that the manufacturing cost of the cutting blade becomes extremely high.

The present invention has been made in view of the above problems, and an object of the present invention is to reliably bring the cutting blade into contact with the front clamp member without separating the cutting blade during band cutting. In this way, it is an object of the present invention to provide a packaging machine in which defective cutting is less likely to occur and the manufacturing cost of the cutting blade and the like can be kept low.

[0010]

In order to achieve the above-mentioned object, the packing machine according to the present invention is basically arranged such that after the band is drawn around the article to be packed and tightened, When the polymerized part with the rear end is heated and melted, the melted polymerized part is pressure-bonded and joined, and the rear end of the band is cut, and when the band is drawn around the object to be packed and tightened. A front clamp member that is moved up and down at a predetermined timing to hold the front end portion of the band, a press member that is moved up and down at a predetermined timing to press-bond the melt-polymerized portion of the band, and the press member When the press member is provided on the front surface of the band facing the feeding direction and is raised together with the press member, the press member is passed through the band insertion opening provided in the front clamp member. Said band being drawn upward and a, a cutting blade which is adapted to cut in cooperation with the front clamping member.

Further, a regulating means is provided between the front clamp member and the pressing member, for preventing the cutting blade from separating from the front clamp member. As a preferable aspect of the regulating means, one of the front clamp member and the pressing member is provided with a guide member provided with a separation regulating surface so as to extend in the ascending / descending direction thereof, and the other is provided on the other side. The ball bearing may be arranged so as to come into contact with the separation regulating surface.

In addition to the basic structure, another one of the packing machines of the present invention is made of a thin plate material, and the blade edge side of the pressing member is bent toward the front clamp member side in the front surface of the pressing member. Some of them are attached in a state. in this case,
A simple method for bending the cutting blade is to insert a shim such as paper between the cutting blade and the press member.

[0013]

[Operation] In the packing machine according to the present invention configured as described above, the press member is raised with respect to the front clamp member along with the cutting blade, and the melt contact polymerization portion of the band is crimped by the press member. After cooling, they are cooled and joined. When the press member is lifted, the ball bearing arranged on the other side comes into contact with the separation regulating surface of the guide member arranged on one of the front clamp member and the press member, and the ball bearing rotates. While the cutting blade is raised, the positions of the pressing member and the cutting blade in the band feeding direction (horizontal direction) do not change with respect to the front clamp member, and therefore the cutting edge of the cutting blade is the front clamp member. The rear end of the band is pushed (sheared) by the cutting blade and the inner upper edge of the band insertion opening of the front clamp member while sliding in contact with each other without being separated from the back surface.

As described above, since the band can be cut while the blade tip of the cutting blade is always in contact with the front surface of the front clamp member without being separated from the back surface of the front clamp member, it is necessary to strongly press the cutting blade against the front clamp member with a spring. As a result, defective band cutting is less likely to occur, the lubricated portion can be reduced, and reliability is improved. In addition, the cutting blade is made of a thin metal plate or the like that is separate from the press member, and is attached to the front surface of the press member in a state in which the blade edge side thereof is bent toward the front clamp member side. The press member can be made of a material having high thermal conductivity, such as an Al alloy or a Cu alloy, which can quickly cool the melt-bonded portion of the band, thereby shortening the cycle time, and also improving the wear resistance and sliding of the cutting blade. It is possible to manufacture it with a material having high mobility and cuttability (hardness), for example, a thin plate material such as blade steel, and it is possible to keep the manufacturing cost low.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a main part of a band edge processing mechanism of an embodiment of a packing machine according to the present invention. The packing machine of this embodiment has a band edge processing mechanism 1 basically similar in configuration to the packing machine shown in Japanese Patent Application No. 5-39796 mentioned above. The band end processing mechanism 1 includes a slide table 40 which is moved forward and backward to the lower surface of the article to be packed, a front clamp member 10 which is moved up and down at a predetermined timing to hold the front end of the band B, and the band B. The press member 30 is moved up and down at a predetermined timing to press-bond the melt-polymerized portion, and the press member 30 is attached to a front surface 30a that faces the feed direction of the band B,
Band insertion opening 12 provided in the front clamp member 10
And a cutting blade 50 adapted to cut the band B, which is pulled out above the pressing member 30 through the above, in cooperation with the front clamp member 10 to cut the band B further. Although not included, a middle slide member inserted between the front end portion and the rear end portion of the band B (overlapping portion), and a heater inserted into the overlapping portion at a predetermined timing so as to alternate with the middle sliding member. Etc. are provided similarly to the above-mentioned conventional one.

The slide table 40 is fixed to the upper end of an arm 41 which is swingably supported by a support shaft 43, and the arm 41 has a cam 5 externally fitted and fixed to a common cam shaft 2. A cam roller 46 that is pressed against is provided, and the slide table 40 is configured to swing together with the arm 41 in association with the unevenness of the cam surface of the cam 5. The arm 41 and the cam roller 46 are urged by a spring (not shown) in a direction in which they come into pressure contact with the cam 5.

The front clamp member 10 is mounted and fixed by bolts 29, 29 on the free end portion of the arm 11 whose base end is swingably supported by the support shaft 7. In the arm 11, one end of a roller support plate 15 provided with a cam roller 16 that is pressed against a cam 3 fitted and fixed to the common cam shaft 2 is swingably connected to a support shaft 17 as a fulcrum. As shown in FIG. 2, the other end of the roller support plate 15 is connected to the lower end of a spring 13 housed in a spring chamber 11a provided near the tip of the arm 11 via a connecting pin 14. It is connected. Therefore, when the cam 3 rotates, the front clamp member 10
Unevenness on the cam surface includes the cam roller 16 and the roller support plate 1.
5, the spring 13, and the arm 11 are transmitted, and as shown in FIGS. 5 and 6, the band B is raised at a predetermined timing to move the front end of the band B to the slide table 40.
It is sandwiched between and and elastically clamped.

On the other hand, in the press member 30, the front clamp member 10, the arm 11, etc. are shown in phantom lines in FIG.
As will be understood by referring to, the front clamp member 1
Similar to 0, the base end portion is attached and fixed to the free end portion of the arm 31 swingably supported by the support shaft 7 by bolts 39, 39. The arm 31 has one end of a roller support plate 35 provided with a cam roller 36 press-contacted to the cam 4 externally fitted and fixed to the common cam shaft 2 swingably connected to a support shaft 37 as a fulcrum. Cage,
The other end of the roller support plate 35 is connected via a connecting pin 34 to the lower end of a spring 33 housed in a spring chamber 31 a provided near the tip of the arm 31. Therefore, when the cam 4 rotates, the unevenness of the cam surface is transmitted to the press member 30 through the cam roller 36, the roller support plate 35, the spring 33, and the arm 31, and
And as shown in FIG. 6, it is made to rise at a predetermined timing. The arms 11 and 31 for the front clamp member 10 and the press member 30 are the cam rollers 1
6 and 36 are pressed against the cams 3 and 45 in the direction of the springs 18 and 3
Energized by 8.

Further, the cutting blade 50 is made of a thin metal plate (steel), as can be seen by referring to FIGS. 3 and 4, and two sinkers are provided on the front surface 30a of the pressing member 30. It is attached and fixed with a screw 52. In this case, the cutting edge 50a of the cutting blade 50 is more than the sinking screw 52.
On the side, between the front surface 30a of the pressing member 30 and the cutting blade 50, a shim 55 such as paper is inserted, and the cutting blade 50 has its cutting edge 50a side of the front clamp member 10. It is attached in a state of being bent toward the back surface 10a. Therefore, in the cutting blade 50, only the cutting edge 50a is in contact with the back surface 10a of the front clamp member 10, and a slight gap S is formed between the lower portion thereof and the back surface 10a of the front clamp member 10. It

In this embodiment, the guide member 20 is attached and fixed to the front clamp member 10 by the bolts 29 so that the cutting blade 50 is not separated from the back surface 10a of the front clamp member 10. In addition, a miniature ball bearing 34 with a seal (oilless) is arranged on the side surface of the pressing member 30. The guide member 20 is made of a steel plate and is formed by bending so as to cover the three surfaces of the front clamp member 10. As can be seen from FIGS. 4 to 6, the front clamp member 10 and the press member 20 are pressed. It has a restriction portion 22 provided with a separation restriction surface 22a along the up-and-down direction of the member 30, and the separation restriction surface 22a of the restriction portion 22 is brought into contact with the rotatable outer race of the ball bearing 34. It is supposed to touch. This ball bearing 34
Is externally fitted and fixed to a spindle 32 that is vertically screwed to the side surface of the pressing member 30.

As can be seen from FIG. 3, the ball of the pressing member 30 is always pressed against the back surface 10a of the front clamping member 10 so that the cutting blade 50 attached to the pressing member 30 is in pressure contact therewith. A locking pin 47, which is erected on the side opposite to the bearing 34, a hook portion 20a formed integrally with the guide member 20 attached to the front clamp member 10 are connected by a relatively weak tension spring 44. There is. With this configuration, when packing the object to be packed with the band B, the above-mentioned actual application 5
No. 39796, the band B is sent out so as to be looped around the object to be packed placed on the work table, and the front end portion thereof is moved to the slide table 40 and the front clamp member 10. Detained at
The delivery surplus is pulled back so as to be wound around the outer peripheral surface of the article to be packed, and its rear end is held by the slide table 40 and the rear clamp member, and then the heater is replaced with the front end of the band B instead of the middle slide member. And the rear end of the band B are melted by heating and melting the front end and the rear end of the band B, then the heater is retracted, and finally the pressing member 30 is raised to melt the melted part of the band B. After being pressure-bonded, they are cooled and joined together, and the rear end is pressed completely between the cutting blade 50 and the front clamp member 10 (the inner upper edge of the band insertion opening 12) which is integrally raised with the press member 30. (Shear).

Here, when the press member 30 is lifted, as shown in FIGS. 5 and 6, the separation restricting surface 22a of the restricting portion 22 of the guide member 20 disposed on the front clamp member 10, The outer race of the ball bearing 34 disposed on the press member 30 comes into contact with the outer race of the ball bearing 34, and the cutting blade 50 is raised together with the press member 30 while the outer race of the ball bearing 34 rotates. The positions of the pressing member 30 and the cutting blade 50 in the front-rear direction (horizontal direction) with respect to the member 10 do not change, and therefore the cutting edge 50a of the cutting blade 50 does not separate from the back surface 10a of the front clamp member 10, It slides in close contact with an appropriate pressing force, and the rear end of the band B is the cutting blade 50 and the band insertion port 12 of the front clamp member 10. It is pressed all the way by the side upper edge (sheared).

In this way, the cutting edge 50a of the cutting blade 50 is
Since the band B can be cut while being always in contact with the back surface 10a of the front clamp member 10 without being separated,
It is not necessary to strongly press the cutting blade 50 against the front clamp member 10 with a strong tension spring as in the conventional case, so that defective cutting of the band B is less likely to occur, a lubrication portion can be reduced, and reliability is improved. In addition, the cutting blade 50 is attached to the pressing member 3
Separately from 0, it is made of a thin metal plate or the like, and the pressing member 3
It is designed to be attached to the front surface 30a of No. 0 in a state in which the blade edge 50a side is bent to the front clamp member 10 side, so that a material having high thermal conductivity capable of rapidly cooling the melted joint portion of the band B, for example, The press member 30 can be made of an Al alloy, a Cu alloy or the like, whereby the cycle time can be shortened, and the cutting blade 50 is made of a material having high wear resistance, slidability, cuttability (hardness), such as blade steel. It becomes possible to manufacture it with a thin plate material, and the manufacturing cost can be kept low.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention described in the claims. The design can be changed. For example, in the above-described embodiment, the guide member is attached to the front clamp member and the ball bearing is attached to the press member, but conversely, the guide member may be attached to the press member and the ball bearing is attached to the front clamp member. Of course.

[0025]

As can be understood from the above description, according to the packing machine of the present invention, the band can be cut while the blade edge of the cutting blade is always in contact with the front surface of the front clamp member without being separated therefrom. Therefore, it is not necessary to press the cutting blade strongly against the front clamp member with a spring, and it is possible to prevent defective cutting of the band, reduce the lubrication portion, and improve the reliability.

Further, the cutting blade is made of a thin plate material separately from the press member, and is attached to the front surface of the press member in a state in which the blade tip side thereof is bent toward the front clamp member side, so that the band The press member can be made of a material having a high thermal conductivity capable of rapidly cooling the melt-bonded portion, such as an Al alloy or a Cu alloy, whereby the cycle time can be shortened.

Furthermore, the cutting blade can be made of a material having high wear resistance, slidability, and cutability (hardness), for example, a thin plate material such as blade steel, and the manufacturing cost can be kept low. .

[Brief description of drawings]

FIG. 1 is a diagram showing a front clamp member of a band edge processing mechanism of an embodiment of a packing machine according to the present invention and a lifting mechanism portion thereof.

FIG. 2 is a diagram showing a press member of a band edge processing mechanism and an elevating mechanism portion thereof of an embodiment of a packing machine according to the present invention.

FIG. 3 is a plan view of a main part of the packing machine shown in FIGS. 1 and 2.

FIG. 4 is an enlarged view of an essential part showing the attachment structure of the cutting blade of the packing machine shown in FIGS. 1 and 2.

5 is a diagram showing a state before the press is lifted, which is used for explaining a band cutting operation of the packing machine shown in FIGS. 1 and 2. FIG.

FIG. 6 is a diagram showing a state after the press is lifted for explaining the band cutting operation of the packing machine shown in FIGS. 1 and 2;

[Explanation of reference numerals] B band 1 band end processing mechanism 10 front clamp member 10a one side surface 12 band insertion opening 20 guide member 22a separation regulating surface 30 press member 30a front surface 34 ball bearing 50 cutting blade

Claims (3)

[Claims] 1. A front clamp member 10 which is moved up and down at a predetermined timing to hold the front end of a band B,
A press member 30 that is moved up and down at a predetermined timing to press-bond the melt-polymerized portion of the band B, and a front surface 30a of the press member 30 that faces the feed direction of the band B. When being raised together, the band B drawn above the press member 30 through the band insertion opening 12 provided in the front clamp member 10 is cut in cooperation with the front clamp member 10. In a packing machine having the band edge processing mechanism 1 including the cut blade 50, the cutting blade 50 is prevented from separating from the clamp member 10 between the front clamp member 10 and the press member 30. A packing machine provided with a regulation means (20, 34). 2. A guide member 20 is provided as the restricting means, wherein one of the front clamp member 30 and the press member 10 is provided with a separation restricting surface 22a along the vertical direction thereof. At the same time, the ball bearing 3 is attached to the other side so as to come into contact with the separation regulating surface 22a.
4. The packing machine according to claim 1, wherein 4 are provided. 3. A front clamp member 10 which is moved up and down at a predetermined timing to hold the front end of the band B,
A press member 30 that is moved up and down at a predetermined timing to press-bond the melt-polymerized portion of the band B, and a front surface 30a of the press member 30 that faces the feed direction of the band B. When raised together, the band B drawn out above the pressing member 30 through the band insertion opening 12 provided in the front clamping member 10 is used.
In a packing machine having a band edge processing mechanism 1 having a cutting blade 50 adapted to cut in cooperation with the cutting blade 50, the cutting blade 50 is made of a thin plate material, and the front surface 30a of the pressing member 30 is used. Further, the packing machine, wherein the blade edge 50a side is attached to the front clamp member 10 side while being bent.