JPH06219425A - Rotary type heat sealer in bag-making, packing machines, etc., and its manufacturing method - Google Patents

Abstract

PURPOSE:To produce, in manufacturing a rotary type heat sealer, a helical, rotary type heat sealer from a straight heat-sealing plate, which is available on the market, and also make it easy to repair such a heat sealer. CONSTITUTION:A heat-sealing plate 30 which is thick and available on the market is attached to a rotary shaft 10 therefor with the intervention of a pair of heating plate-supporting members 15 and at an inclination of a prescribed angle alpha and in a manner of forming, when the heat-sealing plate 30 is turned integrally with the rotary shaft 10 around the axis of the shaft 10, a heat-sealing surface with an equal radius from all points in the outer surface of the heat- sealing plate 30 for its full length. By this method a helical type heat sealer can be produced in a simple manner. Such a heat sealer can be repaired easily also.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type heat sealer for welding a bag material band made of a thermoplastic synthetic resin in a bag making machine and a packaging machine, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a rotary type heat sealer of this type has one heat sealing plate parallel to the rotation axis or 180 °.
In most cases, two sheets are provided with a phase difference of. Further, a heat seal plate having a helical shape was first developed by the applicant of the present application and filed as Japanese Patent Application No. 3-74271.
Since the heat-sealing surface of the former one is parallel to the axis, its entire length comes into contact with the heat-sealing receiving roll or the other party's heat-sealing surface at a time, so it is necessary to manufacture the heat-sealing surface of the total length very accurately. Heat seal is not uniform. Also, in order to improve the efficiency of the heat sealing work by equipping the bag making machine, if the rotation speed is increased, the sealing time for one time becomes too short.

Since the latter type is a helical type, the above-mentioned drawbacks are solved, and the results of a non-public experiment in the applicant company have achieved a good result, but the heat sealer of the bag-making machine has its heat. The wear of the seal surface is severe, it is necessary to re-grind the heat seal surface frequently, the radius of the heat seal surface becomes gradually smaller, and the number of times of reshaping is limited,
The heat sealer carved into the helical type has high manufacturing cost and maintenance cost, and is not practical.

[0004]

Therefore, the present invention has a simple structure, exhibits the same heat sealing effect as the helical heat sealer of the prior art, and has a simple manufacturing method and easy maintenance. To provide to the market.

[0005]

In order to achieve the above-mentioned object, the present invention has a pair of hot plate support members provided and fixed near both ends of a rotary shaft. Both ends of a linear heat-sealing plate made of a metal plate are detachably mounted by fixing means, and the axis of the rotating shaft and the heat-sealing plate are non-parallel with a desired angle difference. The rotary type heat sealer in a bag making machine is characterized in that the outer edge of the sealing plate shares an axis with the axis of the rotary shaft and serves as a heat-sealing surface of a quadric surface having the same radius over the entire length.

In order to achieve the above-mentioned object, the heat seal plate of the rotary type heat sealer in the bag making machine of the present invention has an interval of 180 ° around the rotation axis,
In some cases, it is characterized by being equipped with two units in rotational symmetry.

Further, in order to achieve the above-mentioned object, the phase difference in the circumferential direction of both ends of the heat seal plate of the rotary heat sealer in the bag making machine of the present invention is 10 ° to 90 °. Preferably.

In order to achieve the above-mentioned object, the present invention is a first step of preparing a linear heat seal material plate made of a metal plate and a pair of heat plate supporting members with a rotating shaft. A second step of attaching a pair of hot plate support members near both ends.
A pair of hot plate support members are attached to both ends of the linear heat seal material plate, and the pair of heat plate support members are attached to a rotating shaft, and a desired angular difference is provided between the heat seal material plate and the axis line of the rotating shaft. Are made non-parallel, and are erected with the width direction of the heat seal material plate as a radial direction with respect to the rotation axis, and the rotation axis and the pair of hot plate support members and the pair of heat plate support members and the heat seal material plate are attached and detached Third step of firmly fixing with a free fixing means. A fourth step of grinding the outer edge of the heat-seal material plate to an equal radius over the entire length while rotating a rotary shaft integral with the heat-seal material plate around its axis. Finally, a fifth step of forming a heat seal surface on the outer edge of the heat seal material plate by purposely chamfering and grinding both sides of the outer edge of the heat seal plate extending in the axial direction to form a heat sealer. The method for manufacturing a rotary heat sealer in the bag making machine including the first to fifth steps is as described above.

In order to achieve the above-mentioned object, the pair of hot plate supporting members in the method for manufacturing a rotary type heat sealer in the bag making machine of the present invention are fixed to the rotary shaft with a phase difference of 5 ° to 45 °. It is preferable that the method is

[0010]

First, the operation of the invention according to the first to fourth aspects will be described. The rotary shaft of this heat sealer is supported on the bearing portion of the machine frame of the welding device such as a bag making machine or a packaging machine, and the receiving roller (see FIG. 8) or the heat sealer having the opposite inclination angle is provided in parallel with the bearing shaft. These are parallel to each other (see FIG. 7), and based on the traveling direction of the bag material band by the conveyer (including rollers) of the bag material band, which corresponds to the lead angle of the heat seal plate, these lead angles are offset. Direction of the rotary shaft (see FIG. 9), that is, the end that comes into contact with the receiving roller or the heat sealer of the other side is tilted upstream with respect to the end on the opposite side to rotate the rotary shaft. Equipped with the heat sealer and the conveyer conveyor, while controlling the rotation of the conveyer conveyor with a servomotor etc., it continuously operates and sequentially welds the bag material band being conveyed by the conveyer conveyor in the transverse direction with the heat sealer. . At this time, the contact position between the welding surface of the heat-sealing plate and the receiving roller or the contact portion between the pair of heat-sealing plates moves from one end to the other end with rotation. When the heat-sealed surface is worn out, remove it together with the rotating shaft from the frame of the bag-making machine, and correct it with a grinder. Alternatively, when welding with a different seal shape, it is replaced with a heat sealer having a seal surface of another shape, and the heat sealer is mounted on the bag making machine again. If it is impossible to re-sharpen it, replace it with a new heat seal plate.

According to the second aspect of the present invention, in addition to the above-described action, when the heat seal surface is worn out, the rotary shaft and the rotary shaft are removed from the frame of the bag making machine and the heat seal plate is fixed. The means is loosened, the heat-sealing plate is slightly moved in the radial direction, is fixed again by the fixing means, and the heat-sealing surface is corrected by the grinder.

[0012]

Embodiments of the method invention will be described together with the invention of the present invention. Embodiment 1 In the embodiment shown in FIGS. 1 to 4, conical center holes 11 are formed at both ends of a rotary shaft 10. Next, a pair of the hot plate support members 15 is prepared. A support hole 16 into which the rotary shaft 10 can be slidably fitted is formed in the center of the hot plate support member 15, and a split groove 17 reaching from the outer peripheral surface of the hot plate support member 15 to the support hole 16 is formed. The split groove 17 has a gap size that can be changed by a tightening bolt 18. The rotary shaft 10 is passed through the support hole 16 and the tightening bolt 18 is tightened so that the hot plate support member 15 and The rotating shaft 10 can be fixed.

A support seat 19 forming a part of the pair of hot plate support members 15 and formed on a surface parallel to the axis of the support hole 16 and perpendicular to the radius is slightly longer in the circumferential direction of the rotary shaft 10. It is formed on a flat plane. The pair of hot plate support members 15 have exactly the same shape, and one side of these outer surfaces is slanted off with respect to the plane perpendicular to the axis line corresponding to the inclination angle α of the heat see plate attached thereto. An inclined surface 20 is formed (see FIG. 4), and this inclination angle α is a previously designed purpose angle, and the rotation axis line and the heat seal plate 3 to be described later are formed.
It is formed to have the same inclination angle α with 0. This inclined surface 20
At least two female screw holes 21 are formed in each.
It is preferable that each of the pair of hot plate support members 15 is formed of a single block, but even a lump of two or more parts is included in an embodiment of the following invention. The heat seal plate 30 is usually made of a thick straight metal plate made of a good heat conductor such as brass or gun metal, and at least two second female screw holes 32 are provided in advance on both end faces 31 thereof.

Reference numeral 35 is a pair of connecting members for connecting the heat plate supporting member 15 and the heat seal plate 30. Four through holes 36 are formed in each of the female screw holes 21 and the second female screw holes 32. It is provided corresponding to the position of. Then, the heat plate support members 15 are provided at both ends of the heat seal plate 30 so that the inclined surfaces 20 are on the outer sides of the heat seal plate 30, and the connecting members 32 are respectively used.
Three fixing bolts 37, which are fixing means, are screwed into the 3 and the second female screw hole 32, respectively. In this way, the inclined surface 20 of the hot plate support member 15 and the heat seal plate 30
The inclined end surface 31 of the is flush with the coupling member 35. The axes of the respective support holes 16 of the pair of hot plate support members 15 are located on a straight line.

Next, the common rotary shaft 10 is passed through the support holes 16 of the pair of hot plate support members 15, and the tightening bolts 18 are tightened to move the pair of hot plate support members 15 to the rotary shaft 10. And the fixing bolts 37 are also tightened to firmly fix the rotary shaft 10, the pair of hot plate support members 15 and the heat seal plate 30 to be integrated.

In this way, the rotary shaft 10 and the heat seal plate 30 are inclined at the inclination angle α with respect to the rotary shaft 10 and the heat seal plate 30, and the rotary shaft 10 and the heat seal plate 30 have the lengths of the respective heat seal plates 30 in a plan view. It is fixed by crossing at the midpoint. Thus, the heat-sealing surface 33 of the heat-sealer plate 30 is formed as a quadric surface having the same radius and sharing the central axis with the rotary shaft 10. Next, an embodiment of the invention of the manufacturing method according to claim 5 for forming the heat seal surface 33 will be described. First, the rotating shaft 10, the pair of hot plate supporting members, and the pair of connecting members 32 of the invention are prepared.

Next, a thick linear plate material for manufacturing the heat-sealing plate 30 is cut to a desired size, and female screw holes are bored on a single surface, as in the case of the heat-sealing plate 30 described above. The pair of heat plate support members 15 of the rotating shaft 10 and the material plate to be heat-sealed are fixed by the method described above. Then, the integrated body is supported on the grinder using the center hole 11 of the rotary shaft 10, and while rotating or reciprocally rotating around the rotary axis, the heat seal material plate The outer edge is ground over its entire length into a quadric surface of equal radius R from the central axis of the rotary shaft 10.

Finally, using the grinding machine, while the grinding wheel is being fed in the axial direction, the rotary shaft 10 is reciprocally rotated along the inclination angle α to chamfer both sides of the outer peripheral curved surface, and the sheet seal surface is formed. Shape the width of 33 to the desired width that is equal over its entire length. Finally, a heating source 40 made of a heating wire is embedded or held on the side surface or inside of the heat seal plate 30,
Obtain the desired rotary heat sealer.

In the embodiment, the phase angle difference θ between both ends of the heat seal plate 30 is about 50 °, the radius from the center of the rotating shaft 10 to the heat seal surface 33 is 30 mm, and the pair of heat plate support members 15 are provided. When the outer space dimension is 900 mm, the lead angle (same as the inclination angle) α is about 1 ° 36 '. The above-mentioned phase angle difference θ is not limited to the above-mentioned angle, and
° to 90 ° is preferred. As the phase angle difference θ approaches 90 °, the central portion of the bottom of the heat seal plate 30 becomes the rotating shaft 1.
It is necessary to shave it in an arc shape beforehand so that it does not contact 0.

Operation of Embodiment 1 The operation of the product of Embodiment 1 is similar to that described in the operation of claims 1 to 4, and the conveyor 50 for conveying the bag material band F of a bag making machine, a packaging machine or the like. In the machine frame on the upstream side of
The device A of the present invention is attached by inclining the rotary shaft 10 in a direction that cancels the lead angle α (see FIG. 9). In the first embodiment, the end at which the heat seal surface 33 contacts by approximately 2 ° is located upstream from the other end.

A pair of upper and lower rotary heat sealers A
In the case of using, the radius dimensions up to the heat seal surface 33 are the same, and the width of the heat seal surface 33 is such that if one side has a width b1 = 2.5 mm, the other width b2 = 5.0 m.
It is preferable to form it as wide as about m (see FIG. 7). Further, as the receiving roll, a simple roll 51 may be used (see FIG. 8). This roll 51 is about conveyor 5
The peripheral speed is the same as the peripheral speed of 0, and the peripheral speed when contacting the heat-sealing surface 33 of the apparatus A is controlled and operated so as to be the same as the peripheral speed of the heat-sealing surface.
In this way, when the conveyor 50 and the rotary shaft 10 are operated while controlling the speed by the independent servomotors M1 and M2, the bag material strip is pressed from the one side edge to the other side edge by the heat seal plate 30, Heat seal the bag material band F in the transverse direction.

Since one of the pair of heat seal surfaces 33 is formed wide, the rotational phases of the upper and lower heat seal plates are slightly deviated due to play such as gear transmission and chain transmission, or the heat seal plate 30 is Even if it slightly bends to the side, the pair of heat-sealing surfaces are operated without coming off from each other. The operation of polishing the heat-sealing surface 33 or replacing the heat-sealer is the same as the operation of the present invention, and thus the repetitive description is omitted.

Embodiment 2 The same reference numerals as in Embodiment 1 are the same constituent members and have the same operation. The difference is the mounting portion of the heat plate support member 15 and the heat seal plate 30.

That is, the mounting seats 19 are provided on one side of the hot plate supporting member 15, and the mounting seats 19 are mounted on the supporting holes 1.
The mounting inclined surface 20a has an inclination angle α with respect to the axis of 6, and the mounting inclined surface 20a is provided with two female screw holes 21a. On the other hand, at both ends of the heat seal plate 30, bolt through holes 34 penetrating in the thickness direction are formed in the female screw holes 21a.
The fixing bolts 37 are provided so that the pair of heat plate supporting members 15 and the heat seal plate 30 can be detachably fixed. These bolt through holes 34 are elongated holes in the height direction of the heat seal plate 30 (see FIG. 5). No connecting member is required in this embodiment. Further, the hot plate support member 15
There is a push screw 22 for pushing up the bottom 21 of the heat seal plate 30.

In the method of grinding the heat-sealing material plate, the pair of hot-plate supporting members 15 and the heat-sealing material plate are attached as in the first embodiment, and the rotary shaft 10 is attached to the supporting holes of the pair of hot-plate supporting members 15. 17 and tighten each screw 1
After tightening the 9 and 4 fixing bolts 34 to strengthen them, the heat sealing surface 3 is formed in the same manner as in the first embodiment.
3 is formed.

Operation of Embodiment 2 These operations are almost the same as those of the embodiment. The difference is that when the heat seal surface 33 is worn, the heat sealer is removed from the machine frame together with the rotary shaft 10, the fixing bolts 37 tightening the sheet seal plate 30 are loosened, and then the push screw 22 is used. The sheet seal plate 30 is slightly pushed out to the hot plate support member 15, for example, about 0.2 mm, and the fixing bolt 37 is tightened again.

Then, the heat seal surface 3 is formed by the grinder.
Sharpen 3 to the desired shape and use it again on the bag-making machine, packaging machine, etc. as before. The contact pressure acting on the heat seal plate 30 at the time of heat sealing is supported by the frictional force between the pair of heat plate support seat members 12 and the tip of the push screw 22. In the two Examples 1 and 2, two sets of hot plate support members 15 are attached to one rotary shaft 10, and one heat seal plate 30 is provided in each set with 180 ° phase difference. Even if the mounting rotary shaft 10 is provided so as to be heat-sealed every half rotation, it is included in the embodiment of the present invention.

[0028]

According to the inventions of claims 1 to 4,
The structure is simple, and even if the heat seal surface is worn, it can be easily and accurately ground. In addition, the structure of the assembled parts is simple and there are no parts that cause failure, and it is sturdy, and when heat sealing, the pressure contact moves from one end to the other end of the heat sealing surface due to the lead angle, so the contact pressure is sufficient. Not only is it obtained, but the entire length of the heat-sealed portion is uniform, and there is no risk of defective welding at some parts.

According to the second aspect of the present invention, even if the heat-sealing surface is worn, it is correct again if the linear heat-sealing plate is attached to the hot-plate support member in the radial direction and ground. A heat seal surface can be obtained, and the dimension of the radius of gyration to the heat seal surface can be maintained equal. In the method inventions according to claims 5 and 6, the structure of the assembled parts is simple and easy to assemble, and the heat seal surface is formed by grinding after the assembly, so that the heat seal surface can be formed very accurately. Further, since the heat seal material plate is a linear metal plate, a standard plate material can be used, and the cost can be reduced.

Peculiar effects of the embodiment In the embodiment 1, the rotary shaft 10 is a standard steel rod, the heat sealer plate 30 is a brass square plate material, and the pair of hot plate supporting members 15 and the connecting member 35 are standard. Square steel can be used as a material, and since the pair of hot plate supporting members 15 have completely the same shape, most of them can be overlaid and formed by batch cutting at the time of manufacturing, resulting in a low manufacturing cost.

Further, in the article of Example 2, even if the heat sealer is worn, if this position is shifted in the height direction and the pair of hot plate support members 15 are fixed and polished again, a constant radius R is always obtained.
The heat sealer surface 33 is obtained, and the same heat seal plate 30 can be frequently re-ground and used, which is economical. Further, the heat seal plate 30 is tightened by the pair of heat plate support members 15 and the fixing bolts 37, and is reliably supported by the frictional force of these pressure contact surfaces and the support force of both of the push screws 22. Further, the number of parts is smaller than that of the first embodiment, and the cost can be further reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment.

FIG. 2 is a plan view of FIG.

FIG. 3 is an end view of FIG.

4 is an exploded perspective view of FIG. 1. FIG.

FIG. 5 is an exploded perspective view of the second embodiment.

FIG. 6 is an end view of FIG.

FIG. 7 is an end view showing a state in which a pair of heat sealers are pressure-welded to each other.

FIG. 8 is an end view showing a state where a single heat sealer is pressed against a roller.

FIG. 9 is a partial plan view of a bag-making machine or the like equipped with a heat sealer.

[Explanation of symbols]

 10 rotating shaft 15 heat plate support member 16 support hole 19 support surface 30 heat seal plate 33 heat seal surface α inclination angle θ phase difference angle

Claims (6)

[Claims] 1. A pair of hot plate support members are provided and fixed near both ends of a rotary shaft, and both ends of a linear heat seal plate made of a metal plate are fixed to the pair of hot plate support members. The heat seal plate is non-parallel with a desired angle difference, and the outer edge of the heat seal plate shares the axis with the axis of the rotary shaft. A rotary heat sealer for a bag making machine, a packaging machine, etc., characterized in that it has a quadric surface heat seal surface with an equal radius over the entire length. 2. The rotary type in a bag-making machine, packaging machine, etc. according to claim 1, wherein said heat-sealing plate is provided so as to be movable and fixed in a substantially radial direction with respect to a pair of hot-plate supporting members. Heat sealer. 3. The heat seal plate is 180 around the rotation axis.
2. The rotary heat sealer in a bag-making machine, a packaging machine, etc. according to claim 1, wherein two rotary-symmetric heat sealers are provided in a rotationally symmetrical manner at intervals of °. 4. A rotary heat sealer in a bag-making machine, packaging machine, etc., wherein the phase difference in the circumferential direction at both ends of the heat-sealing plate is 5 ° to 90 °. 5. A first step of preparing a linear heat seal material plate made of a metal plate and a pair of heat plate supporting members with a rotating shaft. A second step of attaching a pair of hot plate support members near both ends. A pair of hot plate support members are attached to both ends of the linear heat seal material plate, and the pair of heat plate support members are attached to a rotating shaft, and a desired angular difference is provided between the heat seal material plate and the axis line of the rotating shaft. Are made non-parallel, and are erected with the width direction of the heat seal material plate as a radial direction with respect to the rotation axis, and the rotation axis and the pair of hot plate support members and the pair of heat plate support members and the heat seal material plate are attached and detached Third step of firmly fixing with a free fixing means. A fourth step of grinding the outer edge of the heat-seal material plate to an equal radius over the entire length while rotating or rotating the rotary shaft integrated with the heat-seal material plate around its axis. Finally, a fifth step of forming a heat seal surface on the outer edge of the heat seal material plate by purposely chamfering and grinding both sides of the outer edge of the heat seal plate extending in the axial direction to form a heat sealer. A method for manufacturing a rotary heat sealer in a bag-making machine, a packaging machine, or the like, which comprises the above first to fifth steps. 6. The pair of hot plate supporting members are 5 ° to 90 °.
6. The method for producing a rotary heat sealer in a bag-making machine, a packaging machine, etc. according to claim 5, wherein the method is to provide a phase difference between the two and fix the rotary shaft.