JPH1149116A - Gusset bag and packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bind a gusset bag with a cord or the like easily and neatly as when the bag is squeezed, by extending out the inside-folded parts of the opening of the gusset bag and by heat-sealing its right-bag sheet and left-bag sheet facing each other. SOLUTION: In a gusset bag 1, ridges (e) and (f) are formed by folding inside both ends ab and cd of a right-bag sheet 2a and left-bag sheet 2b both of which have the same size and are made of a synthetic fiber. In the case of packaging by the use of such a gusset bag 1, two sheets 2a and 2b extended out are bitten at both ends of the gusset bag 1 by means of a pair of biting pawls. Then, while the condition is maintained, the gusset bag is opened in an opening process, stuff is filled into it, and subsequently the opening 4 is heat-sealed to heat- seal the two sheets 2a and 2b together. At the time, the ridges (e) and (f) are in the form of outer ends [in which (a) and (b) coincide with each other and (c) and (d) coincide with each other]. This makes it possible to bind the opening 4 with a cord or the like neatly with the opening squeezed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a form of heat sealing of an opening of a gusset bag, and relates to squeezing the heat sealed opening to facilitate binding with a string or the like.

[0002]

2. Description of the Related Art Conventionally, a gusset bag 1 shown in FIG.
Are bent inward at both ends ab and cd of the right bag sheet 2a and the left bag sheet 2b made of synthetic resin having the same size to form ridges e and f. And gusset bag 1
After the bag is supplied, is held in a state of being gripped by a well-known gripping arm, and is sequentially rotated and conveyed. Then, the filler is filled after being opened, and thereafter, an operation such as vibrating the gusset bag to remove the adhered substance is performed, and then the opening is heat-sealed to complete.

[0003]

As mentioned above, four bag sheets are provided at both ends of the opening of the gusset bag, and two bag sheets are heat-sealed inside the opening. In a case where the opening is narrowed and bound with a string or the like, the appearance may be impaired. Therefore,
SUMMARY OF THE INVENTION The present invention provides a gusset bag in which the sealing form of the opening is different from the conventional one, and a packaging machine capable of heat sealing the gusset bag.

[0004]

The gusset bag according to the first aspect is formed by extending the inwardly bent portion of the opening to the outside and heat sealing the right bag sheet and the left bag sheet together. In the packaging machine according to the second aspect, a right adsorber capable of opening and closing a gripping claw attached to a gripping arm via a claw operating body, heat-sealing an opening of a gusset bag, and adsorbing and opening on both sides of the gusset bag; A left adsorbent and an opening spatula capable of raising and lowering and expanding and closing, when the gripper releases the gusset bag, open the gusset bag with the right adsorber and the left adsorber and insert the open spatula into the gusset bag. After that, the gusset bag is opened and the gusset bag is re-gripped by the grasping claws.

The gusset bag whose both ends are gripped by the four bag sheets is stopped by the gripping claws while being sucked by the right adsorber and the left adsorber. After the gusset bag is opened, the opening spatula is gusseted. After inserting it into the bag, open it and re-grasp the gusset bag again with the grasping claws. By this operation, the end portion of the gusset bag grasps the two bag sheets, so that the gusset bag is sealed with the two bag sheets in the subsequent heat sealing step.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. 1 showing a schematic plan view of a packaging machine 5 and FIG. 2 showing the state of gripping arms 11a and 11b. The supply step (1) of the bag 1, the printing step (2), the step of opening the gusset bag 1, which will be described in detail later, and the step of grasping two bag sheets at both ends and re-gripping with the claws 12 a and 12 b (3); Bag opening step (4), filling step (5), vibrating step (6) for applying vibration to the gusset bag to drop attached matter and the like into the opening, etc., opening inspection (7), opening The packaging is completed while intermittently rotating the seal (8), the cooling of the opening seal portion and the discharge of the non-defective product (9), and the discharge of the defective product (10) in that order.

[0007] The gusset bag 1 is
The gripping arms 11a and 11b are supplied for each bag and described in detail below.
Is gripped over by the gripping claws 12a and 12b attached to the tip of. still,
As shown in FIG. 7 (A), the gusset bag 1 has an opening 4 and ridges e and f bent inward at both ends ab and cd, and the grip claws 12a and 12b 4
While holding the two bag sheets at both ends, the sheet is rotated and conveyed to the printing mechanism 7 in the next step. The printing mechanism 7 includes a print head 7a
After printing on the gusset bag 1, the gusset bag 1 is sent to the next re-grip process.

[0008] Next, regarding the components of the re-gripping process,
A description will be given with reference to FIG. 3 showing the configuration of the main parts diagram and FIG. 4 showing the open and closed states of the grip claws 12a and 12b.

(1) Suction and opening of the gusset bag 1 (see FIG. 3) The right adsorber 15a and the left adsorber 15b are installed at corresponding positions in substantially the center of the upper part of the gusset bag 1.
By operating an unillustrated solenoid valve (or mechanical valve) connected to the tubes 16a and 16b, a suction state is established via a vacuum device. The reciprocating mechanism of the right adsorbing body 15a includes a lifting and lowering rod 20 which moves up and down via a rotating cam 21 and a right rotating body 22 rotatably mounted on a rotating shaft 30a fixed to the base 18.
The right rotating body 22a swings through the lifting and lowering of the lifting and lowering rod 20. Further, the coupling body 22c is fixed to an end of the right rotating body 22a, and the right lever 23b is coupled to the coupling body 22c. Therefore, the swinging of the right rotating body 22a is performed via the right lever 23b. The adsorbent 15a reciprocates.

On the other hand, the reciprocating mechanism of the left adsorbent 15b is as follows.
The right rotating body 22a, the right link 22b rotatably attached to the rotating shaft 30b, and the connecting body 22c connecting the right rotating body 22a and the right link 22b form a parallel link. And a left lever 23a is connected thereto, and reciprocates as the elevating rod 20 moves up and down.
Incidentally, an air ejection mechanism 26 is attached to assist the opening of the gusset bag 1.

(2) Opening and closing of gripping claws 12a, 12b (FIG. 4)
The gripping arms 11a and 11b are configured such that arm bodies 33a and 33b and claw bodies 34a and 34b are rotatably combined with each other. Then, the grip claws 12a, 12b are connected to the nail main body 34a,
It is attached to the tip of 34b, and is rotatable around the arm bodies 33a, 33b and the rotating shafts 35a, 35b. The nail bodies 34a, 34b are elastic bodies 38a, 38b mounted between the arm bodies 33a, 33b, and always hold the gripper 12a.
a and 12b are kept sandwiched.

The pivot shaft 37 of the claw bodies 34a, 34b
Opening / closing members 40a, 40b hang down from a, 37b. When the opening / closing members 40a, 40b are pressed toward the center via the claw operating member 40, the grip claws 12a, 12b are opened. As shown in FIG. 3, the claw operating body 40 is connected to a connecting body 42 which swings around a rotating shaft 43 by reciprocating a link rod 41, and is connected to the opening / closing bodies 40a, 40b. To be pressed and non-pressed.

(2) Elevation and Elevation and Expansion and Shrinkage of Opening Spats 50a and 50b (FIG. 3) The opening spats 50a and 50b are formed in a thin plate shape.
The notches 61a, 50b can be gripped by the gripping claws 12a, 12b even when the gusset bag 1 is inserted into the gusset bag 1.
a and 61b are formed. And this opening spatula 50
Reference numerals a and 50b open and close via a reciprocating main operating rod 51, and can be raised and lowered by a lifting mechanism (not shown) via a lifting body 52. The plate-like elevating body 52 is connected to the rotating shafts 53 a and 53 b formed on the elevating body 52 by parallel links 54.
a, 54b are formed, and the opening spatula 50 is
a is attached.

On the other hand, a rotating shaft 56a formed on the elevating body 52,
Parallel links 57a and 57b are formed on 56b, and an opening spatula 50b is attached via an auxiliary plate 58.
Note that the parallel link 54b is L-shaped, and is connected to the parallel link 57b via pivot shafts 59a and 59b.
It is connected by 9. Therefore, by reciprocating the connected main operating rod 51 with the uniball 60, the opening spatula 5 is opened.
Oa and 50b move left and right (expand or narrow).

Next, the re-gripping operation in the above configuration will be described with reference to FIGS. 5 (A) and 5 (B) and FIGS. (1) Basic Step (Right Adsorbent 15a and Left Adsorbent 15b) The gusset bag 1 is provided with four bag sheets 2a by the gripping claws 12a and 12b with the gripping arms 11a and 11b being narrow.
Since the second adsorbent 2b is conveyed while being gripped, the right adsorbent 15a and the left adsorbent 15b are opened (separated from the gusset bag) from the open state (separated from the gusset bag) via the cam 21 (closely attached to the gusset bag) ( After the process moves to (b), the both sides of the gusset bag 1 are sucked, and then the gusset bag 1 is again opened (b). The right adsorbent 15a
And immediately before the left adsorbent 15b changes from the open state to the closed state,
The solenoid valve connected to the vacuum device is turned "ON" to enable suction.

(2) Gripping Claws 12a, 12b To open the grasping claws 12a, 12b, the link rod 4
1 (the opening and closing members 40a, 40b via the claw operating member 40).
To the center). Therefore, when the right adsorbent 15a and the left adsorbent 15b shift from the closed state (a) to the open state (b), the grippers 12a, 12b are changed from the closed state to the open state (the gusset bag is not gripped). .
For this reason, the gusset bag 1 holds the right adsorbent 15a in the open state.
Is held by the left adsorbent 15b.

(3) Slightly expanding the gripping arms 11a, 11b The gripping claws 12a, 12b are used to open the spatula 50a, 50 described later.
b is unobstructed by the expansion of the gripping arms 11a, 1b
1b is moved from (a) to (b) and slightly expanded. The expansion is performed by a well-known link mechanism shown in FIG. (4) Descent of Opening Spats 50a, 50b The opening spats 50a, 50b are brought into a narrowed state and an expanded state by reciprocating the main operating rod 51, and the elevating body 52 is lowered by an elevating mechanism (not shown). Opening spatula 50
a and 50b can be inserted into the gusset bag 1. Therefore, at the time of the transition from (b) to (c), the opening spatula 50a, 50b in a narrow state is inserted into the gusset bag 1 by lowering the elevating body 52 by an elevating mechanism (not shown).

(5) Closing the gusset bag by expanding the opening spatula 50a, 50b In (c), when the main operating rod 51 moves forward, the opening spatula 50a is moved through the parallel links 54a, 54b, 57a, 57b. , 50b are in the expanded state, and the ridges e, f folded inside the gusset bag 1 are open spatula 50a, 50b.
And the opening is substantially closed. Therefore,
The portion bent inside the gusset bag 1 is extended outside, and the ridges e and f are the outer ends.

(6) Release of suction of right adsorber 15a and left adsorber 15b In (c), the solenoid valve connected to the vacuum device is set to "OF".
F "and release the suction, and via the cam 21,
The right adsorber 15a and the left adsorber 15b are separated and started. (7) When the gusset bag is re-gripped by the grasping claws 12a and 12b and the link rod 41 is moved back to release the pressing of the claw operating body 40, the grasping claws 12a and 12b being pulled by the elastic bodies 38a and 38b become The operation is started by grasping both ends of the gusset bag 1 again (d). At this time, the grip claws 12a, 12b
Are cutouts 61a, 61 formed in the opening spats 50a, 50b.
In order to clamp the portion 1b, the right bag sheet 2a and the left bag sheet 2b of the portions extended outward are gripped.

(8) Discharge from the Gusseted Bags of Opening Spats 50a and 50b The main operating rod 51 is returned to the returning state (the opening spats 50a and 50b are in the narrow state), and the elevating body 52 is raised by a lifting mechanism (not shown). .

By the above steps, the grip claws 12a, 12a
b grasps two sheets (the right bag sheet 2a and the left bag sheet 2b) extended outward at both ends of the gusset bag. Then, after maintaining this state and opening the gusset bag in the opening step (4), filling the filler in the filling step (5), performing vibrations and the like, and heat-sealing the opening 4, two sheets are formed. The sheets (sheets 2a and 2b) are heat-sealed. As a result, as shown in FIG. 7B, the gusset bag 1 assumes a state in which the ridges e and f are the outer ends (a and b and c and d match). The gusset bag heat-sealed in this manner is, for example, compared with the conventional shape (four bag sheets heat-sealed at both ends) as shown in FIG.
As shown in (1), the opening 4 can be easily bound with a string or the like in a squeezed state, and the appearance can be improved.

In addition to the heat sealing of the gusset bag 1, when the positions of the opening spats 50a and 50b are slightly shifted back and forth with respect to the gusset bag 1, the inwardly bent portion is extended outward. A, d shown in FIG.
(Or b, c) is the end, and the grip claws 12a, 12b
When heat sealed in such a state,
The gusset bag assumes the state shown in FIG. As described above, in any of the methods, when the heat-sealing is performed in a state in which the inside bent portion of the gusset bag is extended to the outside, and the opening portion 4 is squeezed and bound with a string or the like, the gusset bag has an appearance. Get better.

[0023]

The gusset bag of the present invention is formed by extending the inwardly bent portion of the opening to the outside and heat-sealing the right bag sheet and the left bag sheet in a state of being joined together. When it is done, it can be easily bound with a string or the like, and the appearance can be improved. According to the packaging machine of the second aspect, it is possible to once again grasp the four gusset bags at both ends with the grasping claws, and the two bag sheets via the right adsorber, the left adsorber, and the opening spatula. Therefore, a gusset bag whose opening is heat-sealed with two bag sheets can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic plan view of a packaging machine.

FIG. 2 is a diagram showing a state of a gripping arm of the packaging machine.

FIG. 3 is a diagram showing a configuration of a main part diagram in a regripping process.

FIG. 4 is a diagram showing the open and closed states of the gripping claws.

FIGS. 5A and 5B are views showing an outline of an operation in a regripping step.

FIG. 6 is a process chart of main parts.

7A is a view of a gusset bag to be supplied, FIG. 7B is a view of a gusset bag after heat sealing, FIG. 7C is a view of one product form of the gusset bag, and FIG. Gusset bag with seal.

[Explanation of symbols]

 1 Gusset bag 4 Opening 11a, 11b Grasping arm 12a, 12b Gripping claw 15a Right adsorber 15b Left adsorber 40 Claw operating body 40a, 40b Opening / closing body 50a, 50b Opening spatula

Claims (2)

[Claims] 1. A gusset bag having an opening, wherein an inwardly bent portion of the opening is extended to the outside, and is formed by heat sealing in a state where the right bag sheet and the left bag sheet are put together. Gusseted bags. 2. A packing machine which can open and close a gripper provided on a gripper arm via a nail operating body and heat seals an opening of a gusset bag. A body and a left adsorbent, and an opening spatula capable of ascending and descending and expanding and closing, after the gripping claws release the gusset bag, open the gusset bag with the right adsorber and the left adsorbent, and gusset the opening spatula. A gusset bag that is reopened after being inserted into the gusset bag, and the gusset bag is grasped again by the grasping claws.