JPH1059322A - Apparatus for sealing bag mouth rim in bag casing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To neatly seal a mouth rim without causing wrinkles or shifting a surface and a rear in position by separating an extending member inserted in a mouth of a bag to have the mouth rim of the bag linearly extended and pressing a sealing member for sealing. SOLUTION: A vacuum cup 24 is operated above a containing box 13 to suck a bag C at the uppermost position in the box 13 for mounting it on a base 12. Then upper and lower vacuum cups 31, 32 are simultaneously operated to open the bag C. A part of an object W to be packaged is temporarily inserted into a mouth of the bag C together with a receive plate 41 and a front end of an extending member 44, and further a pushing member 47 is advanced to push only the object W forward. Then the pushing member 47 is retreated, and the extending member 44 is separated to extend the mouth rim of the bag C flat. Then a pressure applying box 54 is lowered to exhaust air in the bag C by compressed air, and an upper sealing part 58 is lowered to be pushed against a lower sealing member 59 for heat-sealing the mouth rim of the bag C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for sealing the rim of a bag in a machine for packing a packaged object such as a valve.

[0002]

2. Description of the Related Art Heretofore, as this kind of apparatus, there has been known an apparatus having a receiving stand for receiving a bag to be packed and an elevating seal member which is pressed against the receiving stand via an edge portion of the bag. .

[0003]

SUMMARY OF THE INVENTION
It is open because of the package. When the sealing member is pressed against the pedestal through the edge of such an open mouth, wrinkles are formed on the mouth edge, the front and back of the mouth edge are shifted, and the seal cannot be sealed well, There was a problem that was messy.

It is an object of the present invention to provide a bag edge sealing device in a bag filling machine which solves the above-mentioned problems.

[0005]

SUMMARY OF THE INVENTION A bag mouth edge sealing device in a bag filling machine according to the present invention has a receiving stand and a bag to be packaged on the receiving stand with its mouth directed backward. Means, a pair of tension members which are attached to the front-rear slider disposed behind the cradle in a forwardly protruding manner and which can be freely approached and separated in the left-right direction, and are pressed against the cradle via the rim of the bag. The slider is advanced so that the seal member that can be raised and lowered and the tension member when approaching are inserted into the mouth of the bag, and the tension member inserted into the mouth of the bag is separated to stretch the edge of the bag straight. And then lowering the seal member so that the seal member is pressed against the pedestal via the edge of the bag.

[0006] In the bag opening edge sealing device in the bag filling machine according to the present invention, a receiving stand, a means for placing a package to be packaged on the receiving stand with its mouth directed backward, and a receiving stand. A pair of tension members attached to the front-rear slider arranged rearward and protruding forward and retractable in the left-right direction, and a seal member movable up and down which is pressed against the receiving table via the edge of the bag. The slider is advanced so that the tension member at the time of approach is inserted into the mouth of the bag, the tension member inserted into the mouth of the bag is separated, and the edge of the bag is stretched in a straight line. Means for lowering the seal member so that the seal member is pressed against the pedestal via the rim of the bag, so that when pressing the seal member against the cradle, the rim of the bag is straightened. It is in a stretched state. Therefore, wrinkles are not formed on the edge of the mouth, and the front and back of the edge of the mouth are not shifted.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

[0008] In this specification, the front and rear refer to the left of FIG. 2 as a front and the opposite side to the rear with reference to FIG. And

A receiving stand 12 is provided on the upper surface of the bed 11 on the front right side. On the left side of the cradle 12, a movable bag storage box 13 is arranged. The bag storage box 13 has two storage sections 14 adjacent in the front-rear direction. A large number of plastic bags C folded flat and stacked are accommodated in the two accommodating portions 14 with the edge which is opened and becomes a mouth facing backward. The storage box 13 is attached to the front-rear movement cylinder of the rodless cylinder 15, and the two storage parts 14
To the supply position immediately beside the left of.

On the left side of the bed 12 on the upper surface of the bed 11, there is a bag storage box.
A support frame 16 is provided to straddle 13. The support frame 16 has upper and lower guide rails 17 extending in the left-right direction.
Are provided, and the left-right slider 18 is supported by these. The support frame 16 is provided with a motor 19 for driving the slider 18 and a ball screw mechanism (not shown). A bag supply fluid pressure cylinder 22 is mounted vertically downward on the slider 18 via a rearwardly projecting horizontal mounting plate 21. A right-projecting T-shaped arm 23 is attached to the rod of the cylinder 22. At the tip of the arm 23, two bag supply vacuum cups 24 are attached to the front and rear and downward.

When the left-right slider 18 is located at the leftmost position, the bag supply vacuum cup 24 is located above the bag storage box 14. When the left-right slider 18 moves from the left end to the right end to reach the right end, the bag supply vacuum cup 24 moves to the receiving tray 12.
It is located above. The bag supply vacuum cup 24 is moved up and down by the operation of the bag supply fluid pressure cylinder 22.

A rear protruding horizontal plate-shaped bracket 25 is provided on the rear surface of the pedestal 12, and opposed vertical plate-shaped brackets 26 are provided on both left and right ends thereof. Up and down guide rods extending left and right at the upper and lower ends of the vertical plate-shaped bracket 26
27 have been handed over. Two movable blocks 28 are attached to the upper and lower guide bars 27, respectively. A bag opening fluid pressure cylinder 29 is attached to each of the upper two movable blocks 28, and a downward bag opening upper vacuum cup 31 is attached to the lower end of each rod. To the lower two movable blocks 28, downwardly facing lower vacuum cups 32 for opening bags are respectively attached. At the upper and lower ends of the opposed surfaces of the two vertical plate-shaped brackets 26, a vacuum cup spacing adjusting fluid pressure cylinder 33 is mounted so as to face the same on the same upper and lower sides, and each rod is located in the immediate vicinity of the movable block 28. It is connected to.

The operation of the bag opening fluid pressure cylinder 29 raises and lowers the bag opening upper vacuum cup 31. The movable block is activated by the operation of the fluid pressure cylinder 33 for adjusting the vacuum cup interval.
The distance between the upper and lower vacuum cups 31, 32 is adjusted in accordance with the size of the bag by moving the 28 closer and farther away.

The bed 11 behind the cradle 12 is provided with a vertical rotation shaft 34. At the upper end of the rotating shaft 34, a hollow horizontal guide rail 35 is attached in the middle of its length, and a horizontal plate-like longitudinal
37 are supported. The guide rail 35 is equipped with a motor 38 for driving the slider 37 and a ball screw mechanism (not shown). A mounting block 39 is fixed to the front end of the upper surface of the slider 37, and a front protruding cantilevered package receiving plate 41 is mounted on the front surface of the mounting block 39. Mounting block
On the upper surface of 39, two hydraulic cylinders 42 for opening and closing the tension members
Are mounted side by side on the left and right sides of the back and abut against each other. A pair of bag rim members 44 are attached to the respective rods via inverted L-shaped hanging members 43 on both left and right sides of the package receiving plate 41. It is suspended at the same height as the package receiving plate 41.
At the rear end of the upper surface of the slider 37, a fluid pressure cylinder 45 with a brake for operating the pushing member is mounted facing forward. Cylinder
The piston rod 46 of 45 penetrates through the mounting block 39 and protrudes forward, and moves back and forth above the package receiving plate 41 at a slight distance. A to-be-packaged pushing member 47 is attached to the tip of the piston rod 46.

In the state shown by the solid line in FIG. 1, the forward / backward slider 37 faces the forward / backward direction and is located at the retreat limit.
In this state, the clockwise rotation of the rotating shaft 34 turns the slider 37 in the left-right direction as shown by a chain line in FIG. Received on the receiving plate 41. Then, the slider 37 is turned back and forth again by the counterclockwise rotation of the rotation shaft 34.

When the slider 37 is located at the retreat limit, the front ends of the receiving plate 41 and the tension member 44 are separated from the pedestal 12, the slider 37 is located at the inoperative position, and the slider 37 is located at the forward limit. At this time, the front ends of the receiving plate 41 and the tension member 44 face the rear edge of the upper surface of the receiving table 12 from above, and the slider 37 is located at the operating position.

The operation of the tensioning member opening / closing fluid pressure cylinder 42 causes the two tensioning members 44 to open and close while approaching / separating from each other. The distance between the outer edges of the open upholstery member 44 is substantially equal to the width of the flat folded bag C, and the open upholstery member 44 is located at the upright position.
The closed tension member 44 is in the inoperative position.

Hydraulic cylinder with brake for operating pushing member
By the operation of 45, the pushing member 47 reciprocates in the front-rear direction above the receiving plate 41. The cylinder 45 has a variable stroke.

At the center of the upper surface of the pedestal 12, an annular ridge 48 made of a substantially square packing material is provided. At the center of the length of the rear side of the four sides formed by the bank 48, an air discharge groove 49 communicating with the inside and outside of the bank 48 is formed.

A vertical support plate 51 is erected on the rear edge of the upper surface of the pedestal 12, and a rearwardly projecting cantilever horizontal support plate 52 is provided on the upper end thereof. At the center of the horizontal support plate 52, a pressurizing box elevating fluid pressure cylinder 53 is attached vertically downward,
A lower opening pressurizing box 54 is attached to the rod.
The lower end surface of the pressurizing box 54 is flat over the entire circumference and
Except for the groove 49 and the upper surface of the groove 48, they are aligned. A pressurized air hose 55 is connected to the top wall of the pressurizing box 54.

The pressurizing box 54 is moved up and down by the operation of the pressurizing box elevating fluid pressure cylinder 53.
Pressed to 48.

At the left and right ends of the rear edge of the horizontal support plate 52, diagonally rearward protruding arms 56 are provided. At the front end of the arm 56, a sealing member elevating fluid pressure cylinder 57 is mounted vertically downward. A horizontal rod-shaped movable upper seal member 58 extending in the left-right direction is fixed to the lower ends of the rods of both cylinders 57. The upper seal member 58 is located above the rear edge of the upper surface of the pedestal 12, and a fixed lower seal member 59 is provided in the upper end of the upper seal member 58. A heater (not shown) is embedded in the lower seal member 59.

The upper seal member 58 is moved up and down by the operation of the sealing member elevating fluid pressure cylinder 57, and the upper seal member 58 is pressed against the lower seal member 59 at the lower limit.

The right and left sliders 18 include a T-shaped arm 23.
A rightwardly protruding L-shaped pusher 61 for discharging the bag into and out of the packaged object is attached to the front of the container.

When the bag supply vacuum cup 24 is lowered above the storage box 13 to perform a vacuum operation, the uppermost bag C in the storage box 13 is sucked by the vacuum cup 24. Next, the vacuum cup 24 is raised and moved to a position above the receiving table 12, and then the vacuum cup 24 is lowered to release the vacuum, so that the bag C is placed on the receiving table 12. At this time, the rear edge of the bag C protrudes rearward from the cradle 12 (see FIG. 3).

When the bag C is placed on the cradle 12, the upper vacuum cup 31 for opening the bag is lowered. Upper vacuum cup
When the lowering unit 31 is lowered to the lower limit and the upper and lower vacuums 31 and 32 are simultaneously operated, the edge of the bag C is sucked by the upper and lower vacuum cups 31 and 32. Thereafter, when the upper vacuum cup 31 is raised, the mouth of the bag C is opened (see FIG. 4).

When the mouth of the bag C is opened, the front-back slider
When the 37 is advanced to the operating position, the receiving plate 41 and the tension member
Along with the front end of 44, a part of the packaged object W placed on the receiving plate 41 is temporarily inserted into the mouth of the bag C (see FIG. 5). At this time, the tension member 44 is in the non-operation position. Next, the vacuum is released from the upper and lower vacuum cups 31 and 32 for opening the mouth, and the pushing member 47 is moved forward to push the article W placed on the receiving plate 41 forward. Even after the packaged object W is supported on the bottom of the bag C,
The pushing member 47 is advanced slightly. Then, the bag C is moved forward together with the article W to be packaged, and as a result, the rear edge of the bag C projecting rearward from the receiving table 12 is retracted onto the receiving table 12 (see FIG. 6).

Next, the pushing member 47 is retracted, and thereafter,
When the tension member 44 is opened and positioned at the tension position, the edge of the bag C is tensioned flat so as to seal the opposing inner surfaces (see FIG. 7).

Next, the pressurizing box 54 is lowered, and when the lower end of the pressurizing box 54 is pressed against the bank via the bag C, the slider 37 is pressed.
Is retracted, and the receiving plate 41 and the opening member 44 are pulled out from the mouth of the bag C (see FIG. 8). When the pressurized air is supplied into the pressurizing box 54 through the hose 55, the pressurized air pressurizes the portion of the bag C in the pressurizing box 54, and the internal pressure of the portion of the bag C in the pressurizing box 54 is increased. Becomes higher than the internal pressure of the portion outside the pressurizing box 54. Then, the portion immediately above the groove 49 of the bag C is bent downward due to the increased internal pressure, enters the groove 49 to form a hole, and the air in the bag C is discharged through the hole (FIG. 11 and FIG. 11). FIG. 12). In this case, the portion of the bag C that straddles the bank 48 is lifted from the upper surface of the cradle 12 by the height of the bank 48, so that the compressed air is not only above the bag C but also below the bag C. Acts to prevent the hole for air discharge from being crushed (see FIG. 13).

When the air in the bag C is discharged, the upper seal member 58 is lowered, and when the upper seal member 58 is pressed against the lower seal member 59, the edge of the bag C is heat-sealed.
Thereafter, the pressurizing box 54 and the upper seal member 58 are raised, whereby one cycle of the bag filling operation is completed.

When one cycle of the bag filling operation is completed, the bag C for the next cycle is sent to the receiving table 12 in the above-described procedure, and the pusher 61 is moved rightward by the right and left slider 18 at this time. Move right and bag C in the next cycle
Before being placed on the tray 12, the to-be-packaged bag C is discharged to the right from the receiving table 12 by the pusher 61.

[0032]

According to the present invention, when sealing the rim of the bag, it is possible to seal well without wrinkling of the rim or shifting of the front and back of the rim. To clean.

[Brief description of the drawings]

FIG. 1 is a perspective view of an entire bag filling device according to the present invention.

FIG. 2 is a vertical sectional view of the bagging device.

FIG. 3 is an explanatory diagram of a bag filling operation.

FIG. 4 is an explanatory view of a bag filling operation following the operation shown in FIG. 3;

FIG. 5 is an explanatory diagram of a bag filling operation following the operation shown in FIG. 4;

FIG. 6 is an explanatory diagram of a bag filling operation following the operation shown in FIG. 5;

FIG. 7 is an explanatory diagram of a bag filling operation following the operation shown in FIG. 6;

FIG. 8 is an explanatory diagram of a bag filling operation following the operation shown in FIG. 7;

FIG. 9 is an explanatory diagram of a bag filling operation following the operation shown in FIG. 8;

FIG. 10 is an explanatory diagram of a bag filling operation following the operation shown in FIG. 9;

FIG. 11 is an explanatory diagram of a bag filling operation following the operation shown in FIG. 10;

FIG. 12 is an explanatory diagram of a bag filling operation following the operation shown in FIG. 11;

FIG. 13 is an explanatory diagram of a bag filling operation following the operation shown in FIG. 12;

[Explanation of symbols]

 12 Cradle 37 Slider 44 Tension member 58 Seal member C bag W Wrap

Claims (1)

[Claims] 1. A receiving stand 12, means for placing a bag C to be packaged on the receiving stand 12 with its mouth turned rearward, and a front-rear slider 37 arranged behind the receiving stand 12. A pair of tension members 44 which are attached to and protrude forward in the left and right direction and which can be freely moved in and out of the left and right directions, and a seal member 58 which can be raised and lowered and pressed against the receiving table 12 via the rim of the bag C. The slider 37 is advanced so that the tension member 44 is inserted into the mouth of the bag C, the tension member 44 inserted into the mouth of the bag C is separated, and the edge of the bag C is stretched in a straight line,
And a means for lowering the sealing member 58 so that the sealing member 44 is pressed against the cradle 12 via the rim of the bag C.