JP3118541B2 - Heating roll device for forming the thermal bonding part of the packaging container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a cylindrical shape into which a content can be filled when a packaging material such as a bag or a carton is continuously formed by folding one sheet of a band-shaped packaging material into two or overlapping two sheets. The present invention relates to a heating roll device for continuously bonding the overlapping side edges of the packaging material to each other, or for thermally bonding the adjacent packaging containers at regular intervals in the longitudinal direction of the packaging material to separate adjacent packaging containers. .

[0002]

2. Description of the Related Art Cases in which a bag is continuously formed by filling contents while forming a flexible band-like packaging material in which a synthetic resin film is laminated on paper, cellophane, metal foil, etc.
When a carton is continuously formed by folding a rigid band-shaped packaging material in which a synthetic resin film is laminated on paper, the overlapping portion of the packaging material is formed into a bag of a predetermined shape by a heat bonding portion formed by melting the synthetic resin film. It is well known to mold into cartons.

[0005] FIG. 5 shows a longitudinally heat-bonded portion 102 which is obtained by folding a flexible band-shaped packaging material 101 in two and sandwiching the overlapping side edge thereof with a pressing die 106 formed in the circumferential direction of a heating roll 105.
Are formed in a tubular shape by continuously forming the same, and a predetermined amount of the content is supplied therein, and the front and rear surfaces of the packaging material 101 are sandwiched between the pressing dies 108 formed in the axial direction of the heating roll 107 to form the horizontal heat bonding portion 103. FIG. 1 schematically shows a well-known technique for continuously forming a sealed packaging bag 104 by repeating an operation of forming at a constant interval.

FIG. 6 is a cross-sectional view showing a general heating and supporting means of the heating roll 105 forming the vertical heat bonding portion 102 shown in FIG. A heating roller 105 having a circumferentially projecting projection 106 and a receiving wheel 111 is connected to a hollow drive shaft 112.
And the both ends of the drive shaft 112 are supported by support frames 114 and 11.
5 and is rotatably supported by bearings 116 and 117. A gear 118 for transmitting a rotational force is fixed to one end of the drive shaft 112, and a terminal unit 119 having a slip ring is fixed to the other end of the drive shaft 112 so as to provide electric resistance. In this configuration, a rod-shaped heating element 120 made of a body is inserted into the hollow portion 113.

When the press die 106 of the heating roll 105 having such a structure is worn out or when the width of the heat bonding portion is changed, the heating roll 105 must be replaced. May need to be removed.

In these cases, first, the nut 121 is removed, the gear 118 is removed, and the bearing 116 on the opposite side is connected to the support frame 1.
14 and the drive shaft 112 is removed from the bearing 117 and the heating roll 105 to remove the heating roll 105 from between the support frames 114 and 115, or the heating roll 105, the two bearings 116 and 117, and the drive shaft 1
12 is removed from the support frames 114 and 115 as it is, and one of the bearings 116 and 117 is removed.
The heating roll 105 is removed by a procedure of extracting the heating roll 05 from the drive shaft 112, and is assembled by a procedure opposite to the above.

That is, two bearings 1 provided on both sides
At least one of the support frames 114 and 115
The heating roller 105 is removed by removing the heating roller 105 from the support frames 114 and 115 by moving the entire driving shaft 112 in the direction of the central axis, which is extremely troublesome. In addition, since at least one of the bearings 116 and 117 supporting the drive shaft 112 is moved, it is troublesome to perform alignment during assembly, and particularly to position the press die 106 for forming the vertical heat bonding portion so as to face accurately. .

This is because the heating roller 105 is fitted on the drive shaft 112 having a single structure because the heating element 112 is inserted, and the bushes 122 and 123 hold the heating roll 105 from both sides so as not to move in the center axis direction. Therefore, the portion of the drive shaft 112 where the heating roll 105 is mounted is
This is because the bushes 122 and 123 have a larger diameter than the portions supported by the bushings 16 and 117 so that the bushes 122 and 123 abut against the steps.

[0009]

The problem to be solved by the present invention is that the conventional heating roll device in which a heating roll is mounted on a drive shaft having a single structure and both ends are supported by bearings on a support frame. The problem is that the removal and assembly of the heating roll is cumbersome, and the alignment during assembly is particularly troublesome.

[0010]

According to the present invention, a drive shaft is divided into an intermediate shaft, a distal shaft, and a proximal shaft, and one of the distal shaft and the proximal shaft is supported by a center axis. The support is fixed in the direction and the other is supported by the support frame so as to be movable in the center axis direction. Combined. The heating roll is provided with a gap between the heating shaft and the intermediate shaft so that both ends can be integrally rotated with the tip shaft and the base shaft so as to be rotatable and separable from each other. Placed.

[0011]

[Action] When the intermediate shaft is removed from the distal shaft or the proximal shaft and removed from the heating roll and the distal shaft or the proximal shaft is slightly moved, the distance between the distal shaft and the proximal shaft is increased and the heating roll is separated. You. In addition, the movable shaft, the heating roll, and the intermediate shaft are assembled by assembling the movable shaft in the central axis direction based on the stationary shaft in the central axis direction among the distal shaft and the proximal shaft. As a result, the trouble of removing and assembling the heating roll and the trouble of alignment during assembling are eliminated.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to two sets of heating rolls for forming a sealed packaging bag shown in FIG. 5 will be described with reference to the drawings. 1 and 2 show examples of a heating roll for forming a vertical heat bonding portion, and FIGS. 3 and 4 show examples of a heating roll for forming a horizontal heating bonding portion.

1 to 4, a drive shaft 1 has a screw-shaped portion 2 at its tip and a bolt-shaped intermediate shaft 4 having a head portion 3 with a hexagonal hole at its base end, and is screwed to the screw portion 2. A distal shaft 5 and a proximal portion 6 slidably fitted to the proximal portion are disposed on the same central axis, and the distal shaft 5 and the proximal shaft 6 are connected to an intermediate shaft 4. It has a larger diameter than the whole, and is rotatably supported by bearings 7 and 8 on support frames 51 and 52, respectively.

A bush 9 and a gear 10 for transmitting a rotational force are fitted on the distal end of the distal shaft 5 from the bearing 7 so as to be movable in the center axis direction, and a nut 12 is screwed on a screw portion 11 on the distal end. Have been. By tightening this nut 12,
The bearing 7 is pressed via the gear 10 and the bush 9 against the flange 13 formed at the base of the tip shaft 5, the tip shaft 5 rotates integrally with the intermediate shaft 4 without rattling, and the center axis is fixed to the bearing 7. Supported by

The base shaft 6 has a stepped through-hole 15 having a stepped diameter to fit the intermediate shaft 4 and the head 3 with almost no gap.
A current collector 19 including a brush and a slip ring is detachably attached to a mounting flange 17 formed at the base end by a screw 20. The base shaft 6 has a uniform outer diameter except for the mounting flange 17 at the base end and the small-diameter fitting portion 6a at the front end so that the base shaft 6 can be withdrawn from the bearing 8 in the base direction.

The heating roll 21 shown in FIGS.
Heating rolls 31 are fitted with mounting rings 22 and 32 fixed to their distal end portions on fitting portions 5a at the base of the distal shaft 5 to be pressed against the flange portion 13 and joined by the keys 14 to form the distal shafts. 5, so that it can rotate together with it. The fitting portions 6a of the base shaft 6 are fitted into fitting holes 23, 33 formed at the base end portions of these heating rolls 21, 31, whereby the heating rolls 21, 31 are driven shafts at both ends. The first shaft 5 and the base shaft 6 are integrally and rotatably supported by the first shaft 5 and the base shaft 6, and have gaps 27, 37 between the first shaft 5 and the middle shaft 4.

In the heating roll 21 shown in FIGS. 1 and 2, a pressing die 25 for forming a vertical heat bonding portion and a receiving wheel 26 protrude in the circumferential direction from the base end and the front end of the outer peripheral surface of a cylindrical roll main body 24. The two heating rolls 21 disposed so as to sandwich the packaging material maintain the parallelism when the receiving wheels 26 come into contact with each other. The inside of the pressing die 25 has an inner diameter larger than the inner diameter of the roll body 24, and the gap 27 is enlarged.
A coupling ring 28 having a fitting hole 23 is fitted and fixed, the base shaft 6 is fitted, and connected by a key 29.

On the other hand, a heating element 41 made of a wire of an electric resistor wound with a coil is inserted into the gap 27 while being in contact with the inner peripheral surface of the pressing die 25 and separated from the coupling ring 28. Is connected to the conductive wire 42 that has reached the inside of the heating roll 21 from the current collector 19 through the slot 16 by the connection terminal 43, so that the pressing die 25 is heated intensively.

Next, the heating roll 31 shown in FIGS. 3 and 4 is provided with three projecting dies 35 projecting from the outer peripheral surface of a cylindrical roll body 34 at equal intervals in the circumferential direction in the central axis direction. A fitting hole 33 is formed in a coupling ring portion 36 formed integrally with the base end of the roll main body 34, and the base end shaft 6 is fitted and connected by a key 38.

Further, a heating element 45 composed of a filament of an electric resistor wound by a coil is inserted into the gap 37 and the roll body 34 is formed.
The heating element 45 is connected to the conductive wire 46 reaching the inside of the heating roll 31 from the current collector 19 through the slot 16 and the connection terminal 4.
7 to directly heat the entire roll body 31.

The inside of the two heating rolls 21 and 31 passes through the intermediate shaft 4 of the drive shaft 1 with a considerably large gap, and is separated from the heating elements 41 and 45.

In each of the embodiments having such a configuration, when the heating elements 41 and 45 are energized to generate electric resistance heat, the heat heats the roll bodies 24 and 34 to bring the pressing dies 25 and 35 to a predetermined temperature. A heat bonding portion is formed. In each embodiment, since the heating elements 41 and 45 are brought into contact with the inner peripheral surfaces of the roll bodies 24 and 34, the heat efficiency is high, the temperature can be raised to a predetermined temperature in a short time from the start of energization, and the drive shaft 1 Since the heating rolls 21 and 31 are not heated through the intermediary, there is an advantage that the thermal influence on the bearings 7 and 8 is small.

The heating rolls 21 and 31 are screwed into the distal shaft 5 by screwing the intermediate shaft 4 into a state where the end surfaces on the distal shaft side are pressed against the flange 13 and the end surface on the base side is pressed against the step of the fitting portion 6a. In addition to being coupled to the distal shaft 5 and the proximal shaft 6 by the keys 29 and 38, the shaft rotates integrally with the drive shaft 1 at a fixed position.

When removing the heating rolls 21 and 31, insert a tool into the through hole 16 and rotate the intermediate shaft 4 to remove it from the distal shaft 5 and move it in the proximal direction until the distal end enters the through hole 16. Then, the base shaft 6 is slightly moved in the base direction to increase the distance between the base shaft 6 and the front end shaft 5 to be larger than the length of the heating rolls 21 and 31. Completely separated from the support frames 51, 5
Removed from between two.

Next, when assembling the heating rolls 21 and 31, the both ends are fitted to the distal shaft 5, the proximal shaft 6 is moved in the distal direction and fitted, and both ends are fitted to the distal shaft 5 and the proximal shaft 6. In the supported state, the intermediate shaft 4 is inserted and screw-coupled to the distal end shaft 5 to obtain the assembled state.

The heating elements 41 and 45 are arranged in the gaps 27 and 37 so as not to hinder the insertion and removal of the intermediate shaft 4 and to be taken out of the removed heating rolls 21 and 31 and loaded into new heating rolls. Can be used repeatedly.

[0027]

As is apparent from the above description, the drive shaft to which the heating roll is mounted and rotated is divided into an intermediate shaft, a front shaft, and a base shaft, and the front shaft and the base shaft are rotatably supported by the support frame. One of the shafts is immovable in the direction of the central axis and the other is movable, and the intermediate shaft is movably coupled to the one in the central axis direction and screwed to the other. According to the present invention, in which the heating element is disposed in the gap between the intermediate shaft and the heating roll so that they can be integrally rotated and separated from each other by being supported at both ends, the distal shaft and the proximal shaft can be removed without removing the bearing from the support frame. The heating roll can be removed or assembled by moving one and the intermediate shaft,
Exchange, inspection, and repair can be performed easily. In addition, since the assembly is performed with reference to the one of the distal shaft and the proximal shaft which is immovable in the direction of the central axis, the positioning of the pressing die is particularly easy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line XX of FIG.

FIG. 3 is a longitudinal sectional view showing a different embodiment of the present invention.

FIG. 4 is a sectional view taken along the line YY of FIG. 3;

FIG. 5 is a perspective view showing an example of forming a heat bonding portion.

FIG. 6 is a longitudinal sectional view of the heating roll in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive shaft 2 Screw part 4 Intermediate shaft 5 End shaft 6 Base shaft 7, 8 Bearing 15 Through hole 21, 31 Heating roll 24, 34 Roll body 25, 35 Pressing die 27, 37 Air gap 41, 45 Heating element 51, 52 Support frame

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65B 51/10 B29C 65/18 B31B 1/64 321 B65B 51/16

Claims (1)

(57) [Claims] 1. A heating roll having a pressing die for thermal bonding on an outer peripheral surface of a cylindrical roll body is rotatably mounted and supported integrally with a drive shaft, and the drive shaft is provided on both sides of the heating roll. In a heating roll device for forming a thermal bonding portion of a packaging container rotatably supported by bearings on two support frames,
The drive shaft is divided into an intermediate shaft, a distal shaft, and a proximal shaft, and one of the distal shaft and the proximal shaft is supported by the one support frame so as not to move in the center axis direction, and the other is the other. The support shaft is movably supported in the center axis direction, and the intermediate shaft is movably fitted in the center axis direction in a through-hole formed through one of the tip shaft and the base shaft in the front-rear direction so that the tip portion is on the other side. Screw-connected, the heating roll has a gap between the intermediate shaft and both ends are supported so as to be integrally rotatable with the distal shaft and the proximal shaft and separable from each other,
A heating roll device for forming a heat-bonded portion, wherein a heating element is arranged in the gap.