JPH0560784B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a device for forming a valve in a piece of material for making bags (hereinafter referred to as bag blank) having folds on its sides.

<Problems to be Solved by the Invention> Conventionally, forming a valve at the opening of a bag took time, and it was not easy to bend extremely soft or extremely hard materials.

The object of the invention is to provide a device which makes it possible to supply bags with folded valves in a short time and continuously in short cycles, and which furthermore has the advantage of being able to fold bags into bag blanks. The object of the present invention is to provide a device that can easily form a valve seat on a valve that has been manufactured.

<Means for Solving the Problems> In order to achieve the above object, the device for forming a valve in a bag blank according to the present invention is configured to convey the bag blank at intervals perpendicularly to the longitudinal direction of the bag blank. a conveyance device, a frame body that opens in the conveyance direction of the bag blanks and surrounds the conveyance device, and a frame body provided on both sides of the conveyance surface of the bag blanks so as to be movable toward or away from the conveyance surface. A clamping member is attached to each clamping member so as to be rotatable between the transport surface and a plane perpendicular to the transport surface, and the rotation axis is attached to a rotating arm provided parallel to the transport direction, and a rotating arm that rotates to each rotating arm. It is provided so as to be freely movable, and its rotation axis is perpendicular to the conveyance direction of the conveyance device and the rotation arm.
When the rotating arm moves toward a plane perpendicular to the conveying surface, it is introduced into the opening of the bag blank, and its tip rotates to a position at an angle of approximately 45 degrees to the conveying direction and touches the side of the bag blank. The present invention is characterized in that it includes a finger member to be inserted, and a crease forming device that is provided on the frame opposite to the rotating arm and is movable toward the rotating arm on the conveying surface.

Preferably, the conveying device further includes a valve sheet inserting means having a valve sheet supply means and a gluing means for gluing the folded valve sheet to the folded valve near the downstream side of the frame in the conveying direction of the conveying device. It is better to set it up.

In order to make the folding operation particularly simple, the pivot axis of the pivot arm coincides with the front edge of the clamping means, and each pivot arm is actuated by a rack driven by a pressure cylinder, and this rack is connected to the pivot arm. It is preferable that each pressure cylinder be fitted with a fan-shaped gear fixed to the frame, and that each pressure cylinder be rotatably provided on the frame.

More preferably, the valve seat inserting means includes two conveyor belts parallel to each other, the conveyor belts are pressed against each other on one side to convey the valve seat while pinching it, and one of the rollers conveying the conveyor belt One moves away from the opposing roller to release the valve seat held between the conveyor belts, and when this valve seat is inserted into the opening of the bag blank, it moves towards the opposing roller again. It is better to configure the conveyor belt so that it is pressed against the conveyor belt.

A gluing position is provided near the conveyor belt for gluing along the edge of the valve seat held by the conveyor belt, and the edge of the valve sheet to be glued protrudes from the conveyor belt.

The folding and insertion operations of the valve seat are accomplished by providing a sliding member. This sliding member is movable at right angles to the longitudinal direction of the conveyor belt towards the opening of the bag blank and intersects the conveyor path of the valve seat immediately after the conveyor roller.

<Function> Materials that are difficult to bend, such as extremely soft or extremely hard synthetic materials, need to be bent at as small an angle as possible using guide means. After the opening of the bag blank is expanded perpendicularly to the conveying direction by a rotating arm rotatably attached to the member, the finger member is inserted into the side of the bag blank, and a crease is formed by a crease forming device. This allows for bending at small angles.

Further, since the finger member is rotatably provided on the rotary arm and the rotary arm is rotatably provided on the clamping member, when the bag blank is clamped by the clamping member, the rotary arm, the finger member and the bag are connected. The relative position with respect to the blank is determined, and a valve with little variation in shape is reliably formed.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

1 and 2 show a valve folding device according to the invention. The bag blanks 4 are conveyed by the conveying means 1 at intervals, with their longitudinal direction perpendicular to the conveying direction, to a device 7 for folding the valves 8. The conveying means 1 is formed by two pairs of conveyor belts 2 and 3 arranged one above the other, one pair of which grips the bag blank 4 near the bottom 9, and is arranged parallel to this conveyor belt. Another pair of the bag blanks 4 are held at a fixed distance of 10 from the open top 11 of the bag blank 4.

The folding device 7 of the valve 8 includes a frame 12 that is open in the conveying direction of the bag blank 4.
This frame body 12 is mainly formed by two C-shaped main frames 13 and 13' fixed in parallel to each other.
The free ends 14, 15 of the main frames 13, 13' are located above and below a conveying surface 16 represented by the bag blanks 4 held between the conveyor belts 2, 3. The folding device 7 is designed approximately symmetrically with respect to this conveying surface 16.

A clamping means 17 is provided between the two main frames 13, 13' for clamping the bag blank 4 during the folding operation, and the bag blank 4 remains stationary during this operation. Each clamping means 17 includes two clamping members 19 and 20, and the bag blank 4
The longitudinal ends thereof, in which the side folds 18 are formed, are clamped. One of the clamping members 19 is located above the conveying surface 16, and the other 20 is located below. The clamping members 19 and 20 can be opened by a pressure cylinder 21 pivotally connected to the main frame 13, and are pressed against each other when clamping the bag blank 4.

In order to guide each clamping member 19, 20, a connecting plate 22 is provided which is pivoted at one end to the main frame 13, 13' and at the other end to the respective clamping member 19, 20. Each of the clamping members 19 and 20 includes plate-shaped rotating arms 23 and 24 whose longitudinal lengths are parallel to the conveyance direction 6. Each of the rotating arms 23 and 24 is rotatable around an axis 25 parallel to the conveyance direction by a drive device 26, and more specifically, from position A shown in FIG.
It is configured to be rotatable between positions B shown in the figure, and at position A it is approximately parallel to the conveying surface 16 and at position B it is approximately perpendicular to the conveying surface 16.

A pressure cylinder 27 fixed to the main frame 13 is attached to each rotating arm 23, 24 as a drive device 26. The piston of the pressure cylinder 27 has a fan-shaped gear 2 fixed to the rotating arms 23 and 24.
A rack 28 is attached which fits into the rack 9.
The fan-shaped gear 29 is fixed to the rotating arms 23 and 24 such that the shafts 25 of the rotating arms 23 and 24 substantially overlap each other on the conveyance surface 16. Each rotating arm 23,
24 also has its axis 32 with respect to the conveying direction 6.
Finger members 30 and 31 are also pivotally mounted perpendicular to the planes formed by the rotating arms 23 and 24. Each finger member 30, 31 moves from position C shown in FIG.
It is configured to be rotatable between positions D shown in the figure by a drive device 34, and at position C, its tip 33 is approximately parallel to the conveying direction 6,
At position D, the angle is approximately 45 degrees.

The frame 12 is further provided with a crease forming device 38 at approximately the same height as the conveying surface 16. This device 35 is provided with an end portion 36 that is rotatable toward the rotary arms 23 and 24, and in this embodiment, it rotates toward the bag blank 4, so that the conveying surface It is rotatable around a vertical axis 37 of 16. A pressure cylinder 38 is likewise used as a drive, the piston of which is formed with a rack 39 and a gearwheel 40.
mated with.

Figures 3-5 show a valve seat insertion device located near the folding device. This device is equipped with a roller 41, on which a belt-shaped sheet 42 constituting the valve seat is fed from a supply roller (not shown) toward a cutting device 43, which cuts the folded valve. The belt-shaped sheet 42 is cut into a length approximately twice the height 45. Slightly below the cutting device 43, two mutually parallel conveyor belts 46, 47 are provided, each belt being pressed against the other on one side and sandwiching the valve seat 44 between them. At this time, the valve seat 44 protrudes further laterally than the conveyor belts 46 and 47, and along the conveyor belt,
A gluing position 48 is reached, in which the protruding edge 49 of the valve seat is glued.

Lower roller 5 that conveys the conveyor belts 46 and 47
1 and 52 are located slightly above the conveyance surface 16.
A sliding member 53 is provided on the conveying surface 16 of the bag blank and is movable perpendicularly to the conveying direction towards the opening 11 of the bag blank 4, thus
It intersects with the conveyance path of the valve seat 44. When the valve seat 44 reaches the position shown in FIG. 5, this sliding member 53 is actuated. At this time, half of the valve seat 44 is located above and below the conveying surface 16 of the bag blank 4.

Lower rollers 51, 52 of conveyor belts 46, 47
At least one of the conveyor belts 46, 4 is moved away from each other by the action of the eccentric member 54.
Open the valve seat 44 held between 7 and
When the valve seat 44 is inserted into the opening 11 of the bag blank 4, it moves again toward the opposing rollers and presses against the conveyor belts 46, 47.

On both sides of the conveying surface 16 of the bag blank 4, clamping plates 56 actuated by pressure cylinders 55 are provided and actuated to secure the valve seat 44 inserted into the folded valve 8.

The apparatus of the present invention constructed as described above operates as follows.

First, the bag blank 4 is placed between two main frames 13 and 13'.
At this point, the conveyor belts 2 and 3 stop, and the bag blank 4 is held at the folded side edges 18 by the holding members 19 and 20. At this time, the plate-shaped rotating arm 2
3 and 24 are at position A and are parallel to the conveying surface 16 of the bag blank 4, while the finger members 3
0,31 is at position C. After that, the finger member 30,
31 rotates toward the opening 11 of the bag blank 4 and reaches position D. At the same time, the rotating arms 23, 24
rotates to position B, which is substantially perpendicular to the conveying surface 16. At that time, the side surfaces 58, 59 of the bag blank 4 are bent around and along the clamping members 19, 20, and the finger members 30, 31 are introduced into the opening 11 of the bag blank 4, with their tips pointing in the conveying direction. The bag blank 4 is rotated to a position of approximately 45 degrees and inserted into the side surfaces 58 and 59 of the bag blank 4.

Suction nozzles 57 are provided on the rotating arms 23 and 24 so that the finger members 30 and 31 can be easily introduced into the opening 11 of the bag blank 4.
7 moves in a direction away from the side surfaces 58, 59 of the bag blank 4. When the pivot arms 23, 24 reach position B, the fold forming device 35 moves toward the bag blank 4, and then the pivot arms 23, 24 pivot again and return to position A.

The finger members 30 and 31 are separated from the bag blank 4,
Moving over it, the valve seat 44 is inserted into the folded valve 8 . In order to facilitate this insertion operation, a suction nozzle 57 may be further provided. In order to insert and fold the valve seat 44 without error, the rollers 5 of the conveyor belts 46, 47 are used.
A valve seat guide 60 is provided below 1 and 52, and the sliding member 53 and the valve seat 44 pressed by the sliding member 53 pass between these guides.

When the creased end 61 of the valve seat 44 is inserted into the fully folded valve 8, the sliding member 53 is withdrawn and the valve briefly rests against the clamping member 56.
under pressure.

It should be noted that the present invention is not limited to the embodiments described above, and those skilled in the art will be able to imagine various modifications. It should be understood that such modifications are included within the scope of the present invention as long as they do not depart from the spirit of the present invention.

<Effects of the Invention> Since the present invention is configured as described above, it produces effects as described below.

In addition to ensuring reliable operation of each movable member in a relatively complex folding device, it is also possible to fold very soft or very hard materials.

The time required to form the valve seat on the valve folded into the bag blank is configured so that it does not exceed the time required for the folding operation, so the time required for one cycle of bag production is shortened, and a large number of bags can be produced. could now be produced cheaply.

[Brief explanation of the drawing]

1 and 2 are two different state diagrams of a valve folding device according to the present invention, and FIGS. 3 to 5 are respective state diagrams of a valve seat insertion device according to the present invention. . 1... Conveying means, 2, 3, 46, 47... Conveying belt, 4... Bag blank, 7... Valve folding device, 8
...Valve, 12...Frame, 13, 13'...Main frame, 17...
Clamping means, 19, 20... Clamping member, 23, 24...
Rotating arm, 30, 31... finger member, 35... crease forming device, 41, 51, 52... roller, 42... strip-shaped sheet, 43... cutting device, 53... sliding member, 56...
Holding plate, 57... Suction nozzle, 60... Valve seat guide.

Claims (1)

[Scope of Claims] 1. An apparatus for forming a valve in a bag blank having folds on its side, comprising: a conveying device for conveying the bag blank at intervals perpendicular to the longitudinal direction of the bag blank; a frame body that opens in the conveyance direction and surrounds the conveyance device; a holding member provided on the frame body so as to be movable toward or away from the conveyance surface on both sides of the conveyance surface of the bag blank; and a conveyance surface. The rotation axis is attached to each clamping member so as to be rotatable between the planes perpendicular to this, and the rotation axis is attached to a rotation arm provided parallel to the conveyance direction, and a rotation arm is attached to each rotation arm so as to be rotatable. The moving axis is perpendicular to the transport direction of the transport device and the rotating arm, and when the rotating arm moves toward a plane perpendicular to the transport surface, it is introduced into the opening of the bag blank, and its tip is perpendicular to the transport direction. A finger member that rotates to a position of approximately 45 degrees and is inserted into the side of the bag blank, and a finger member that is provided on the frame opposite to the rotating arm and is movable toward the rotating arm on the conveyance surface. A device for forming valves on a bag blank, characterized in that it is equipped with a crease forming device. 2. The device according to claim 1, which includes a valve seat insertion means equipped with a valve seat supply means and a folded valve seat near the downstream side of the frame in the transport direction of the transport device. An apparatus for forming a valve on a bag blank, further comprising gluing means for gluing the folded valve. 3. A bag blank that is the device according to claim 1 or 2, characterized in that the rotation axis of the rotation arm is provided on the same straight line as the front edge of the clamping means. A device that forms a valve. 4. A device according to claim 3, in which each pivot arm is actuated by a rack driven by a pressure cylinder, which rack engages with a sector gear fixed to the pivot arm; An apparatus for forming a valve in a bag blank, characterized in that each pressure cylinder is rotatably provided on a frame. 5. The device according to claim 2, wherein each of the valve seat insertion means includes two mutually parallel conveyor belts, and the conveyor belts are pressed against each other on one side to sandwich the valve seat. One of the rollers conveying the conveyor belt moves away from the opposing roller to release the valve seat held between the conveyor belts, and the valve seat is inserted into the opening of the bag blank. An apparatus for forming a valve on a bag blank, characterized in that when the bag blank is pressed, the bag blank moves toward the opposing roller again and presses against the conveyor belt. 6. The apparatus according to claim 5, characterized in that a gluing position is provided near the conveyor belt for gluing along the edge of the valve seat held by the conveyor belt. A device that forms valves in bag blanks. 7. The apparatus according to claim 5 or 6, wherein a sliding member movable perpendicularly to the longitudinal direction of the conveyor belt is provided toward the opening of the bag blank, and the sliding member is provided with a valve. A device for forming a valve on a bag blank, characterized in that the conveyance path of the sheet intersects with the conveyance path immediately after the conveyance roller.