JPH0780266B2 - Folding device for bag opening - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for folding an opening edge of an upwardly opening bag body into the bag body with a substantially constant width.

[0002]

2. Description of the Related Art A bag such as a paper bag is formed into a bag by processing a material with a bag making machine, and a bag having left and right gussets is also handled in a flat state by folding it. When attaching the carrying hand, open the bag mouth and perform the necessary work. In order to attach the carrying hand, there is a case where the opening peripheral edge of the bag is folded into the bag with a substantially constant width to reinforce the bag. In order to automate the attachment work of the carrying hand, it is necessary to mechanize the folding process of the peripheral edge of the opening as described above, but conventionally, mechanization of this kind of work has hardly progressed.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and its object is to mechanize the work of folding the opening peripheral edge of the bag body, and particularly to the vertical and horizontal sides. It is to be able to perform a folding operation without needing adjustment even for a bag having openings having different lengths.

[0004]

In order to solve the above problems, the present invention lowers the inside of the bag by the elevating means 10 and opens the opening in a rectangular shape at a predetermined position lower than the opening end.
One set of expansion pieces 21 is provided movably forward and backward and leftward and rightward within the opening by the expansion and contraction means 20, and in order to approach the opening from the front and back and to fold the front and rear edges into the bag body with a substantially constant width, A main folding piece 31 that rotates inward downward from the outer upper portion of the edge portion is installed so as to be movable back and forth with respect to the edge portion before and after the opening, and the left and right edge portions that are inclined into the bag body by folding the front and rear edge portions. The subfolding piece 41 which is rotated to fold the left and right edges into the bag body with the same width as the front and rear folding width is installed so as to be able to approach and separate from the left and right edges, and the bag opening After the peripheral edge of the bag is folded into the bag body with a substantially constant width, the expanding piece 21 is once lowered and contracted to raise and lower means 10.
The device is configured to be lifted above the bag body.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Each drawing shows one embodiment of a folding device for a bag opening according to the present invention. The bag B is folded by a bag-making machine and the necessary parts are adhered together, and it is sometimes called a raw bag (Namatai), and it is carried by the carrying means to the lower part of the apparatus with its opening standing upright. It is assumed to be stopped at a fixed position. The transport means may be arbitrary, but in the case of the illustrated device, a bag body B having an elongated rectangular or rectangular opening.
2 is a transporting means for transporting two of them in the longitudinal direction, and the apparatus A having the front view width shown in FIG.

The apparatus according to the embodiment has a pair of front and rear first guide shafts 11, 11 in the vertical direction and a support rack 12 installed on the upper end of the first guide shafts 11, and has a mounting base having a substantially gate-shaped side surface (FIG. 2). A double-acting cylinder device as the lifting means 10 is supported by an upper piston 10a of the supporting frame 12
The lower piston 10b is provided with an elevating table 13 attached thereto. The lifting table 13 includes the first guide shafts 11 and 11.
It has a slider 14 which moves up and down at both ends, and can move up and down while maintaining a constant posture.

The elevating table 13 extends in the front-rear direction, and has a pair of front and rear second guide shafts 15 extending in the left-right direction orthogonal to the elevating table 13 in the lower part (see FIGS. 3 and 1). Reference numeral 15a indicates an end plate at the end of the guide shaft. Second guide shaft 1 in the left-right direction
Sliders 16 are fitted and inserted in the reference numerals 5 and 15, and a pair of left and right shaft rods 18 that are movable in the front-rear direction are mounted via movable frame members 17 that can move with the sliders 16. 19 is a support material,
The second guide shaft 15 and the like are connected to the lift table 13.

In order to lower the opening into a rectangular shape and open the opening in a rectangular shape at a predetermined position lower than the opening end, a set of four expansion pieces 2
1 is provided on the axial rod 18 in the front-rear direction. Each expansion piece 21,
Two of each of 21, 21, 21 are suspended from a slider 22 provided so as to be movable along the left and right axles 18, 18. These shaft rods 18, 18, 18, 18 are the frame members 1
It is a piston that can be moved forward and backward by a forward-backward movement cylinder device 23 as an expansion / contraction means 20 provided near the front and rear ends of 7, 7.

Therefore, a set of four expansion pieces 21 is movable in the front-rear direction within the opening of the bag body, and by the left-right movement cylinder device 24, it is also moved in the left-right direction along the second guide shafts 15, 15. You can also move to. Therefore, four expansion pieces 21
˜21 are moved in the front-rear direction, left-right direction, and expanded / contracted by the expansion / contraction means 20 including the front-rear movement cylinder device 23 and the left-right movement cylinder device 24. Furthermore, both cylinder devices 2
3, 24 can be operated via the fluid pressure regulator driving it. As a result, the bag B is prevented from being damaged during expansion, and the expansion piece 21 automatically moves so as to easily extend in the longitudinal direction of the opening and stop at a predetermined elongation in the direction orthogonal thereto. Controlled by.

A main folding piece 31 is provided so as to approach the opening of the bag B from the front and rear and to fold the front and rear edges into the bag with a substantially constant width. This main folding piece 31 is shorter than the longitudinal length of the opening, has a depth necessary for folding the edge portion (see FIG. 1), is attached to the pivot 32 at the lower end, and the outer side of the bag body is centered on this axis. Rotate from top to bottom inside. A reinforcing piece C is affixed to the upper end of the opening of the bag body B in the length direction, and the peripheral edge of the opening is folded inward at the lower edge of the reinforcing piece C. Therefore, the reference side 25 located at the lower edge of the reinforcing piece is formed. Expanding piece 2
1 (see FIG. 2). In the case of the embodiment, before the folding piece 31 performs the folding operation, the folding piece 31 is advanced toward the opening of the bag body B so as to cope with the difference in the opening width. 33 is an advancing cylinder device therefor, in which the piston 33a has a fixed piece 34
Since the cylinder side is movable together with the holding member 35, the guide shaft 36 provided parallel to the moving direction slides in the slider 37 (FIG. 5). A rack 38 extending in the moving direction of the cylinder device 33 is attached to the holding member 35.
8a meshes with the other folding mechanism arranged side by side and moves forward and backward in parallel.

A pivot 32 having the folding piece 31 is pivotally supported by a holding member 35, and a rack 32b meshing with a gear 32a attached to the shaft 32 can be moved forward and backward by a piston 39a of a folding cylinder 39. (Fig. 6). 39b is a fixed piece to which the folding cylinder 39 is attached, and is provided on the holding member 35. Note that 38b is a shaft of the synchronous gear 38a, and extends in the direction of another pair of folding mechanisms.

Further, by folding the front and rear edges, the sub-folding piece 41 can be moved toward and away from the left and right edges of the opening in order to fold the left and right edges into the bag, which is already being folded into the bag. It is provided. This subfolding piece 41
Consists of a pair of openable and closable members that are narrower than the left and right edges, and are pivotally supported at the lower ends of the mounting members 42 suspended from the elevating table 13 so that they can be opened and closed downward (FIG. 1, FIG. (Fig. 2).

In the folding device according to the present invention thus constructed, the lower piston 10b of the elevating means 10 extends so that the expanding piece 21 first descends to a predetermined position in the bag body. Next, the forward / backward moving cylinder device 23 and the leftward / rightward moving cylinder device 24 of the expansion / contraction means 20 operate simultaneously or in tandem, and the expanding piece 21 is brought into contact with the inner surface of the bag body B to open it into a predetermined opening shape. Hold the state. At this time, as described above, the pressure of the fluid in both cylinder devices can be adjusted to adjust the expansion force and automatically set the appropriate expansion degrees in the front, rear, left, and right directions.

When the expanding pieces 21 to 21 appropriately tension the opening of the bag, the forward cylinder device 33 is actuated, whereby the main folding pieces 31 and 31 are moved forward in parallel toward the opening to move them forward and backward. The holding member 35 occupies the lower part of the edge portion and hits the expanding piece 21 through the bag body B, and when it is confirmed, the folding cylinder 39 operates and the main folding pieces 31, 31.
Rotates the edges of the front and rear of the bag body from above the outside to below the inside to fold it. At this time, the left and right edges of the bag are almost folded inward of the opening. Therefore, the subfolding pieces 41, 4
1 is closed, the left and right edges are pressed into the bag body, and the folding of the entire circumference is completed.

After the folding of the opening is completed, the expanding piece 21 is once lowered into the bag body by the extension of the upper piston 10a, and the expanding / contracting means 20 operates in the opposite direction at that position to contract the expanding piece 21. To After that, the upper and lower pistons 10a and 10b contract again, and the expanding piece 21 is raised.

[0016]

EFFECTS OF THE INVENTION Since the present invention is constructed and operates as described above, not only can the work of folding the opening peripheral edge of the bag body inward be mechanized, but also the lengths of the vertical and horizontal sides can be increased. It is possible to automatically perform the folding work for the bags having different openings, without any adjustment.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a bag opening folding device according to the present invention.

FIG. 2 is a side view for explaining the same device.

FIG. 3 is a partially cutaway plan view of the same.

FIG. 4 is a plan view of a main part of the same.

5 is an explanatory view seen from the direction of the line VV in FIG.

6 is an explanatory view seen from a VI-VI line direction in FIG. 4. FIG.

Claims (5)

[Claims] 1. A device for folding an opening peripheral edge of a bag body opened upward into the bag body with a substantially constant width, the apparatus being lowered into the bag body by a lifting means 10 and at a predetermined position lower than the opening end. In order to open the opening in a rectangular shape, a set of four expansion pieces 21 are provided so as to be movable in the front-rear direction and the left-right direction in the opening by the expansion and contraction means 20, and approach the opening from the front and rear and the front and rear edges have a substantially constant width. In order to fold it into the bag body, a main folding piece 31 that pivots inward and downward from the outer upper part of the front and rear edges is installed movably back and forth with respect to the edges before and after the opening, and by folding the front and back edges, the inside of the bag is folded. Approach the left and right edges that are inclined to
A sub-folding piece 41 that is rotated to fold the left and right edges into the bag body with approximately the same width as the front-rear folding width is installed so as to be able to approach and separate from the left and right edges of the opening, and the peripheral edge of the bag opening is After being folded into the bag body with a substantially constant width, the expansion piece 2
1. A folding device for an opening of a bag body, wherein the device 1 is once lowered and contracted, and is raised by a lifting means 10 onto the bag body. 2. The elevating means 10 comprises two pistons, an upper and a lower piston.
a and 10b, the upper piston 10a of which is suspended on the support frame 12 and the lower piston 10b of which lifts the platform 1.
3 is suspended, and one set of four expansion pieces 21 is used to lift the platform 1.
3. The folding device for the bag opening according to claim 1, wherein the folding device has a structure attached to the bag. 3. A pair of front and rear second guide shafts 15 extending in the left-right direction with respect to the opening of the bag body is attached to the lower part of the lifting table 13, and a pair of left-right frame members 17 extending in the front-rear direction are provided along the guide shafts 15. The expansion pieces 21 are attached to the right and left frames 17 and 17 two by two, and each of the frames 17 and 17 is driven by the left-right movement cylinder device 24. 21 is a cylinder device for forward and backward movement 2
3. The folding device for the bag opening according to claim 2, which is configured to be driven by 3. 4. The main folding piece 31 is attached via a pivot 32 to a holding member 35 which is accessible to and retractable from the bag opening by a forward cylinder device 33. The device for folding a bag opening according to claim 1, wherein the device is configured to fold the edge portion into the bag body. 5. The sub-folding piece 41 approaches the left and right edges that are inclined into the bag body from above, and is openable and closable left and right located inside and outside the bag body for folding the edges into the bag body. The bag folding device according to claim 1, comprising a pair of members.