JPH09150807A - Bottom sealing device in bag manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and rapidly carry out the adjusting work for the height of a bottom sealing main body even during the work by providing freely controllably the height of the bottom sealing main body provided movably up and down on a guide column stood on a machine stage in accordance with the height of the film bottom part. SOLUTION: Cylindrical parts 11a and 11b of both upper and lower ends of a bottom sealing main body 11 are movably up amd down and freely inserted in guide columns 55 and 56 stood on a machine stage 1 and a pair of heat sealing bars 12 and 12 with a length of 2-4-fold of the width of a bag are provided on the inner face of the apex on its central upper part and the bottom part of a film for packaging is heat-sealed by means of a pair of the heat sealing bars 12 and 12. In a case when the heat sealing position accompanied with change in the size of a bag is adjusted, a lock bolt 65 is unfastened and a handle shaft 58 and a screw shaft 60 are rotated by operating a handle 57 to move the bottom sealing main body 11 in the up and down direction. Then, the top end face of the cylindrical part 11a of the bottom sealing main body 11 is fitted to a mark indicating each size of a bag provided on the guide column 56 and is fixed by tightening the lock bolt 65. It is possible by this operation to easily adjust the heat sealing position during operation or even during stopping of operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottom sealing device in a bag making apparatus for continuously manufacturing various kinds of bags from a packaging film wound in a roll.

[0002]

2. Description of the Related Art As a bottom sealing means of a conventional bag making apparatus,
The outline is described in JP-B-58-44534 and JP-B-52-47396. By the way, the bag making apparatus disclosed herein is such that the packaging film wound into a roll is folded in two with the side edges upward in the longitudinal direction, and the bottom seal of the bent portion and the fixed bag width are provided for each. It is a structure in which a vertical seal is applied to form an uncut continuous bag, which is cut and separated into one bag. The bag making apparatus described in the latter patent publication is related to the present applicant, and a specific configuration of the bottom sealing means described herein is not shown. It was designed to be fixed with bolts. The sealing bar has a length substantially equal to the width of a large bag, and heat sealing is performed for each bag by the sealing bar.

[0004]

By the way, in the conventional bottom sealing means, when the size (length) of the bag to be made is changed, the bolt fixing the seal body is loosened each time. Thus, while holding the main body by hand, the body is appropriately moved so as to match the sealing position of the bag, and tightened and fixed again. For this reason, there is a problem that such adjustment work is troublesome and cannot be performed unless the operation of the bag making apparatus is stopped. In addition, if the time required for one heat seal is long, it directly affects the production amount of the bag. The time depends on the material and size of the bag, but the production capacity of the bag making and packaging machine is usually 25 to 50.
There is a problem that the production rate of bags cannot be increased unless the time is shortened.

Accordingly, an object of the present invention is to provide an apparatus capable of performing the operation of adjusting the position of the bottom seal accompanying the change in the size of the bag easily and quickly even during operation, and efficiently performing the bottom seal. It is in.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is to intermittently transfer a packaging film folded in two with its side edges upward in the longitudinal direction and stop the transfer. In a bottom sealing device in a bag making device which is sometimes configured to apply heat sealing to the bottom portion of the film, the bottom sealing device has a length of 2 to 4 times the width of the bag to be formed and becomes the bottom portion of the film. A bottom seal body with a pair of sealing bars to open and close the lever with a pair of sealing bars for performing complete heat sealing by heating the part two to four times is provided on a guide column erected on the machine base so as to be able to move up and down The height of the bottom seal main body is adjusted according to the height of the bottom portion of the film during operation or when operation is stopped.

[0007]

According to the bottom seal device having the above-described structure, when the size (length) of a bag to be formed is changed, the bottom seal body is guided according to the height of the bottom portion of the film. By moving up and down along the column, adjustment of the heat sealing position can be easily performed. Therefore, this bottom seal device has an advantage that the adjustment work of the heat seal position accompanying the change in the size of the bag can be easily and quickly performed either during operation or when operation is stopped. Also,
Since the sealing bar is provided at a length of 2 to 4 times the width of the bag to be formed, the same portion serving as the bottom portion of the film is set at 2 to 4 times.
Complete heat sealing can be performed efficiently with each heating. In the case of a bag without a bottom seal, the sealing bar is kept open.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view in which a part of the bottom seal device is omitted, FIG. 2 is a perspective view seen from the back, FIG. 3 is a front view of a frame moving mechanism for operating a drive link, FIG.
FIG. 5 is an explanatory view of a drive mechanism for driving the frame, FIG. 6 is an explanatory view showing another embodiment of the drive mechanism, FIG. 7 is an explanatory view of a state in which the sealing bar is opened, and FIG. FIG. 9 is a schematic plan view of the bag making apparatus.

The bottom sealing device 10 heat seals a bottom portion b of a packaging film f (hereinafter, referred to as a film) folded in two with its side edge upward in the longitudinal direction shown in FIG. is there. As shown in FIG. 1, above the center of the bottom seal body 11, a G-shaped lever 13, 13 having a pair of sealing bars 12, 12 having a length of 2 to 4 times the bag width on the inner surface of the tip. Are rotatably supported by the shaft 15 facing each other,
An arm 13a formed on each lever 13 has a trifurcated drive link 17 supported below the arm 13a so as to be swingable by a shaft 16.
And links 18, 18. Cam follower 19 fixed to free end 17a of drive link 17
Is loosely fitted in a vertically long rectangular frame 20, as shown in FIG. The frame body 20 is supported by the machine base 1 so as to be movable in the horizontal (left / right) direction by a mechanism described below that performs a swinging motion by rotation of a cam.

As shown in FIGS. 2 and 3, the frame 20 is
An upper horizontal frame 22 and a lower horizontal frame 23 are provided on the vertical frames 21, 21 arranged in parallel. One end 22a of the upper horizontal frame 22 is
The other end 22b is connected to a V-shaped lever 28 loosely fitted to the shaft 27. Similarly, one end 23a of the lower horizontal frame 23 is connected to a lever 30 loosely fitted to the shaft 29, and the other end 23b is connected to a V-shaped lever 32 loosely fitted to the shaft 31. The arm 28a of the V-shaped lever 28 and the arm 32a of the V-shaped lever 32 are connected by a link 33. A pin 34 projects laterally near the upper end of the link 33, and the head 35 a of the bolt 35 is loosely fitted to the pin 34. Reference numeral 37 denotes a drive lever fixed to a swing shaft 40 rotatably supported on the machine base 1 side, and a piece 38 provided on the lever 37 is provided with a shaft 3 of the bolt 35.
5b is attached via a spring 36.

As shown in FIG. 4, reference numeral 41 denotes a cam lever loosely fitted to a swing shaft 40, and a cam follower 42 is provided at a free end thereof. A link 43 fixed to the projecting piece 41 a of the cam lever 41 is connected to a link 46 fixed to a shaft 45 of a lever 44 fixed to the swing shaft 40 by a pin 47. A stopper 48 provided on the cam lever 41 is brought into contact with the side surfaces of both links 43 and 46. As shown in FIG. 5, an air cylinder 51 is mounted on a lever 50 fixed to the swing shaft 40, and a rod side 51 of the air cylinder 51 is mounted.
a is connected to a lever 52 fixed to the shaft 45.

The cam follower 42 is a spring 5 having one end on the shaft 45 and the other end hooked on the machine base 1 on a cam 54 whose rotation is controlled by a drive motor (not shown).
It is pressed with an elasticity of 3. Such a series of configurations is an example of the driving mechanism D.

In the bottom seal device 10, the drive link 17 is swung by moving the frame 20 in the left-right direction by the drive mechanism D described above, so that the pair of levers 1
3 and 13 are configured to be openable and closable. As shown in FIG. 6, the frame 20 is operated in the left and right direction by an air cylinder, and the cam 20 is moved by moving the rod of the cylinder forward and backward.
May be configured to swing.

The bottom seal body 11 has upper and lower ends of the cylindrical portions 11a and 11b which are mounted on the machine base 1 by guide columns 55, 5 and 5.
6 is loosely fitted so as to be vertically movable. A handle shaft 58 having a handle 57 is rotatably provided on one of the guide columns 55, and a lower portion of the shaft 58 is screwed to the cylindrical portion 11b, and a bevel gear 59 is fixed to a lower end thereof. In the other tubular portion 11b,
The bevel gear 61 is fixed to the lower end of the screw shaft 60 by screwing. Reference numeral 62 denotes an intermediate shaft supported at both ends by the guide columns 55 and 56, and a bevel gear 6 fixed near its support.
3 and 64 are engaged with the bevel gears 59 and 61, respectively. Thus, when the handle shaft 58 and the screw shaft 60 are rotated by the rotation operation of the handle 57, the bottom seal main body 11 is moved up and down to adjust the height.
Further, a lock bolt 65 for fixing the bottom seal body 11 is provided in the cylindrical portion 11a. Bottom seal body 11
The cam follower 42 is also provided to move within the frame 20 as shown in FIG.

This bottom sealing device 10 is usually used by being installed in a bag making device A as shown in FIG. The outline of the bag making apparatus A is as follows: a film supply mechanism i for feeding out a film f wound into a roll; forming means ii for folding the film f in two with its side edge upward in the longitudinal direction; A vertical sealing means iv for heat-sealing a vertical portion of the film f bent by the means ii, a film feed mechanism v for intermittently feeding uncut continuous bags, and a film feed mechanism v when the feed of the film feed mechanism v is stopped. Cutting bag into one bag a
And a cutter mechanism vi for cutting into pieces.

Next, the bottom sealing device 1 having such a structure
The operation of 0 will be described. When the packaging film f folded in two with the side edges upward in the longitudinal direction is stopped at the position of the bottom seal device 10 in a state where the sealing bars 12, 12 shown in FIG. Cam 54 when stopped
Rotates counterclockwise to swing the cam lever 41 outward, and slightly rotates the swing shaft 40 (FIG. 4). As a result, the drive lever 37 swings upward to push up the link 33 and move the frame 20 rightward (FIG. 3). Then
As shown in FIG. 1, the movement of the frame 20 causes the drive link 1 to move.
When the lever 7 is swung, the levers 13 and 13 are closed and 12
Sealing bars 12, 12 maintained at a temperature of 0 to 200 ° C.
Heat seal is performed. Thereafter, the cam lever 41 is swung inward by the cam 54, and the link 13 is pulled down in the opposite manner, so that the levers 13 and 13 are opened again.

Next, the film f is fed by the film feed mechanism v.
, The bottom seal device 1
0 performs the same operation again as described above, and the bottom portion b is sequentially sealed, and the bottom seal is completed.

The air cylinder 51 of the driving mechanism D includes:
As shown in FIGS. 4 and 5, the rod side 51a is retracted to hold the links 43 and 46 at the toggle position.
And the cam lever 41 are integrated. Therefore,
For example, when a trouble occurs during the operation of the apparatus and the operation must be suddenly stopped, when the operator presses the stop button, the rod side 51a of the air cylinder 51 is extended and the links 43 and 46 are disengaged. The lever 44 is swung clockwise as shown in FIG. As a result, the link 33 is pulled down to open the lever 13, and the sealing bar 12 is separated from the film f, so that the burning of the film f is prevented.

The adjustment of the heat sealing position according to the size change of the bag will be described. By loosening the lock bolt 65 to release the lock and operating the handle 57 to rotate the handle shaft 58 and the screw shaft 60, the bottom seal body 1
1 moves upward or downward. Therefore, guide pillar 56
The upper end face of the cylindrical portion 11a of the bottom seal body 11 is aligned with an index (not shown) indicating each size of the bag provided in the above, and the lock bolt 65 is fastened and fixed. By such an operation, the heat sealing position can be easily adjusted either during the operation of the apparatus or when the apparatus is stopped.

Thus, according to the bottom seal device 10, the operation of adjusting the bottom seal position accompanying the change in the size of the bag can be performed.
It can be performed simply and quickly even when the apparatus is stopped or during operation. Furthermore, since the heat sealing time per location is shortened, the bottom seal can be quickly and efficiently performed as a whole.

[Brief description of the drawings]

FIG. 1 is a front view in which a part of a bottom sealing device is omitted.

FIG. 2 is a perspective view seen from the back.

FIG. 3 is a front view of a movement mechanism of a frame for operating a drive link.

FIG. 4 is an explanatory view of a drive mechanism for driving a frame.

FIG. 5 is an explanatory view of a drive mechanism for driving the frame.

FIG. 6 is an explanatory view showing another embodiment of the drive mechanism.

FIG. 7 is an explanatory view of a state in which a sealing bar is opened.

FIG. 8 is an explanatory view of a bag.

FIG. 9 is a schematic plan view of a bag making apparatus.

[Explanation of symbols]

f → Packaging film a → bag b → bottom part A → bag making device i → film supply mechanism ii → forming means i
v → vertical sealing means v → film feed mechanism vi → cutter mechanism 1 → machine base 10 → bottom seal device 11 → bottom seal body
12 → Sealing bar 13 → Lever 55, 56 → Guide post

Claims (1)

[Claims] 1. A packaging film folded in two with a side edge upward in a longitudinal direction is intermittently transferred in a horizontal direction, and a heat seal is applied to a bottom portion of the film when the transfer is stopped. In the bottom sealing device of the bag making device, the same portion as the bottom portion of the film having a length of 2 to 4 times the width of the bag to be made is completely heat-sealed by heating 2 to 4 times. A bottom seal main body with a pair of sealing bars for opening and closing a lever is provided so as to be movable up and down on a guide column erected on the machine base, and the height of this bottom seal main body is set to the height of the bottom portion of the film. A bottom seal device in a bag making device, which is provided so as to be adjustable during operation or when operation is stopped.