JPH07101419A - Cylinder extending device of packing bag manufacturing device - Google Patents

Abstract

PURPOSE:To realize manufacture of bags different in specification or in capacity in manufacturing of bags in the state cylinder extending bodies are filled in a long and a series of vinyl sheet cylinder. CONSTITUTION:A pair of right and left cylinder extending bodies 6, 6 provided with extending flaps 3, 3 to be inserted into a long, continuous and a series sheet cylinder drawing part, and for tensing the cylinder by a spring in the front and back directions by a spring and beam flaps 5 to be tensed by the spring in the width direction are connected by a connecting member 7 so that the space in the width direction may be freely adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder expanding device for expanding a sheet cylinder of a bag making apparatus for obtaining a bottomed packaging bag having a constant length from a series of continuous sheet cylinders. The sheet cylinder is not limited to a vinyl sheet,
Polyethylene, other synthetic resin, mesh,
Sheets such as paper, leather, fibers, non-woven fabrics, and woven fabrics are used.

[0002]

2. Description of the Related Art While pulling out a roll-wound sheet cylinder made of vinyl or the like,
To obtain a bottomed packaging bag of a certain length, in order to handle the completed bag and to facilitate the packaging work, use this vinyl with the expanding body that expands the sheet cylinder loaded. Make a bag while pulling out the sheet cylinder. In this bag making form, the bag standard,
It is necessary that the expanded cylinder is fitted in the seat cylinder with an appropriate expansion force regardless of the capacity or the like.

[0003]

SUMMARY OF THE INVENTION According to the present invention, a sheet cylinder 1 is inserted into a drawer portion of a series of sheet cylinders 1 which communicates with each other for a long time, and the sheet cylinder 1 is stretched by springs 2 in a front and back direction. Of a pair of right and left expanding cylinders 6 and 6 having a tension piece 5 which is tensioned by a spring 4 in a direction, are connected by a connecting member 7 so that the widthwise interval is adjustable. It has the structure of a cylinder expanding device.

[0004]

OPERATION AND EFFECTS OF THE INVENTION While the expanded cylinder body 6 is inserted into the sheet cylinder 1 and pulled out, the front and back sides of the sheet cylinder 1 are polymerized and united at a constant length to form a bottom. At this time, the left and right expanding cylinders 6 and 6 are connected by the connecting portion 7 and are integrally positioned inside the seat cylinder 1, and are pressed to the front and back sides by the pair of opening and expanding pieces 3 and 3 on both left and right sides. There is. At the same time, at the left and right side end portions, the side end surface portions expanded by the expanding pieces 3, 3 are expanded by the tension piece 5. When the sheet cylinder 1 opened by each of the expansion pieces 3 and 3 and the tension piece 5 is pulled out by a certain length and the bottom portions are joined together, the sheet cylinder 1
As the front and back sides are sandwiched and attached, the front and back expansion pieces 3 and 3 are narrowed against the spring 2, and the left and right tension pieces 5 are expanded by the spring 4 so that the front and back sides of the seat tube 1 are The parts are allowed to polymerize, and the polymerization and coalescence are performed.

When the right and left widths of the sheet cylinder 1 are different standards, the connecting member 7 is fitted so as to fit the width of the sheet cylinder 1.
By expanding and contracting, the intervals between the left and right expanding cylinder bodies 6, 6 and the tension pieces 5, 5 can be adjusted.

As described above, each of the left and right expanding cylinders 6 and 6 has the opening and expanding pieces 3 and 3 and the tension piece 5, and the connecting and adjusting member 7 adjusts the distance between them to open and close the expanding and expanding pieces 3 and 3. Tension piece 5
The relationship such as can be adapted to the width of the sheet cylinder 1 as it is, and it is possible to accurately carry out front and back superposition and bonding at the time of forming the bag bottom portion, and securely pull out the sheet cylinder 1 and hold the bag mouth portion. Can be done.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated example, an expanding cylinder 6 has a wedge shape, and an outer surface thereof is formed on an inclined surface 8 so that a lower end side is inclined outward. At the upper end of this expanding body 6, there are open and close portions 3 and 3 along both the front and back sides which are rotatable around a pin 9 and are outwardly tensioned by a spring 2 at an appropriate angle. Expanding body 6
At the central portion of the thickness of, the tension piece 5 is rotatable around the pin 10 and is tensioned outward by the spring 4.

[0008] Between the pair of left and right expanding cylinders 6 and 6 having the expanding and expanding pieces 3 and 3 and the tension piece 5, a connecting member 7 which can expand and contract.
Are connected together to form an integral unit. The connecting member 7 includes an adjusting handle 11 at an intermediate portion, a pinion 15 rotated by the adjusting handle 11,
An adjusting case 12 having 16 and a pair of rack rods 13, 13, 14, 14 which are slidable in the left-right direction at the upper part of the adjusting case 12 are provided in upper and lower two stages.

The rack rods 13, 13, 1 in each of these stages
The rack rods 13, 13, 14, 14 are movably engaged with both sides of the upper and lower pinions 15, 16 in the adjusting case 12 by rotating the handle 11.
This rack rod 13, 1
The outer ends of 3, 14, 14 are connected to the respective expanded cylinder bodies 6, 6.

The vinyl sheet cylinder 1 is wound in a band shape and wound around a roll, erected rotatably by a reel 17, and guided by a guide roll 18, a brake 19 and the like so as to be drawn out. A pair of front and rear guide rolls 21, 21, 22, 22 are provided on the upper part of the frame 20 so as to be vertically movable, and the interval between the lower guide rolls 22, 22 is narrower than the interval between the upper guide rolls 21, 21. It is possible to dispose the expanding cylinder 6 between these guide rolls 21, 21, 22, 22.

The front and rear guide rolls 21 and 21,
22, a pair of left and right guide rolls 23 on the left and right sides
23 is provided close to the outer inclined surfaces 8, 8 of the expanded cylinders 6, 6.

The sheet cylinder 1 pulled out from the reel 17 while being guided by the guide roll 18, the brake 19, etc.
1,21,22,22,23,23 is pulled out upward, and the expanded cylinders 6 and 6 are fitted in the end openings of the sheet cylinder 1 so that the spacing between the guide rolls 21,21,22,22, etc. Located in the department.

A pair of gripping pieces 28 for holding the front and back edges of the leading edge of the sheet cylinder 1 which is drawn out by fitting the expanding cylinders 6 and 6 in this manner at four positions near the inside of each opening and expanding piece 3 and 3. , 28 are arranged on a carriage whose movement is controlled in the vertical Y-direction and the front-back X-direction, and the chuck 24 of this carriage holds the upper edge of the sheet cylinder 1 and pulls it out in the Y-direction. After bag making, it is transferred as it is in the X direction for packaging processing.

On the right and left sides where the expanding cylinders 6 and 6 are located, the opening positions of the tension pieces 5 and 5 are determined, and the expanding and expanding pieces 3 and 5 are determined.
Positioning stoppers 25, 25 for adjusting the holding position of the chuck 24 of the sheet cylinder 1 when the sheet 3 is opened,
The solenoids 26, 26 actuate the chuck 24 in accordance with the holding timing.

Numeral 27 is an electrothermal welding device for forming a bag bottom, which holds the sheet tube 1 from both front and back sides and heat-bonds it. The welder 27 has a guide roll 29 for guiding the sheet cylinder 1 and is provided above the tips of the expanding and expanding pieces 3, 3 of the expanding cylinder body 6, and the left and right tension pieces 5, 5 are provided. Then, the sheet cylinder 1 in a state of being superposed on the front and back is sandwiched and welded by being pressed outwardly. When the bottom of the bag is formed by the welder 27, the positioning stoppers 25, 25 are opened to the outside so that the tension pieces 5, 5
Will not be regulated.

[Brief description of drawings]

FIG. 1 is a perspective view of an expanded cylinder.

FIG. 2 is a front view thereof.

FIG. 3 is a side sectional view thereof.

FIG. 4 is a plan view thereof.

FIG. 5 is a sectional view showing the operation.

FIG. 6 is a perspective view thereof.

FIG. 7 is a side view showing the overall arrangement.

[Explanation of symbols]

 1 sheet cylinder 2 spring 3 open expansion piece 4 spring 5 tension piece 6 expansion body 7 connecting member

Claims (1)

[Claims] 1. A series of sheet cylinders 1 which are in communication with each other for a long period of time are inserted into the drawer portion of the sheet cylinders 1, and the sheet cylinders 1 are stretched by springs 2 in the front-back direction and by springs 4 in the width direction. A cylinder expanding device for a packaging and bag making apparatus, in which a pair of left and right cylinder expanding bodies 6 and 6 having a tension piece 5 are connected by a connecting member 7 so that the space in the width direction can be adjusted.