JPH0645356Y2 - Thermal welding and cutting device for sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a bag-making machine for manufacturing a shopping bag made of a thermoplastic synthetic resin film such as polyethylene resin, for example, in the form of a cylindrical sheet folded flat. The present invention relates to a thermal welding and cutting apparatus for sheet-like bodies that separates and welds bodies in parallel and cuts between the parallel welded portions.

(Prior Art) For example, when the shopping bag 1 is manufactured from a thermoplastic synthetic resin sheet body such as a polyethylene resin film as shown in FIG. 3, it is made of a thermoplastic synthetic resin film as shown in FIG. A long tubular sheet body 2 is prepared, the tubular sheet body 2 is flattened, and both sides thereof are folded inwardly in a V shape to form a folded portion 3 and folded into a flat shape. The tubular sheet body 2 is introduced into a bag making machine, and the tubular sheet body 2 is intermittently conveyed by the length of the shopping bag 1 in the bag making machine, and the tubular sheet body 2 is separated at predetermined intervals. And heat-welded in parallel and heat-welded part 5
Is formed, and the intermediate portion of the heat-welded portion 5 is cut to form a bag body 6 having both ends closed, and thereafter, the bag body 6 is inserted into a hole 9 of the bag body for insertion into a pin for bundling to form a large number of bag bodies. After bundling 6,
By cutting one end of the bag body 6 into a U shape including the tops of the V-shaped folded portions 3 on both sides, the handbag 7 and the opening 8 are formed, and the shopping bag 1 is manufactured. .

Then, in such a bag-making machine, when a long sheet-like body such as the tubular sheet body 2 is cut to form the regular-sized bag body 6, conventionally, a shearing (shearing) method or a hot method is used. The knife method and the flying knife method are adopted.

In the conventional shearing method, as shown in FIG. 5, a fixed blade 40 is provided so as to face the conveyance path, and the movable blade 41 is lowered with respect to the fixed blade 40 to cut the sheet-like body 43. It has a structure.

Further, in the conventional hot knife method, as shown in FIG.
It has a structure in which it is pressed against the groove portion 46 of the seal block 45 located at the lower part of the above to burn it off.

Furthermore, as shown in FIG. 7, the conventional flying knife method uses a knife attached to an endless belt 47 that is driven and circulated.
The sheet-shaped body 43 is cut at 48.

(Problems to be solved by the invention) However, each of the above-mentioned conventional cutting methods has a problem of endurance, and the shearing method and the flying knife method cause wear of the cutting edge, and thus the fixed blade is frequently used. Four
0, the movable blade 41 or the knife 48 needs to be removed and polished, and the hot knife method has a problem in that a slag of synthetic resin is seized on the hot knife 44, and either method cannot withstand continuous use.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a thermal welding and cutting device for a sheet-shaped body that can be continuously used in a bag-making machine.

(Means for Solving Problems) A sheet-shaped body thermal welding and cutting device of the present invention is configured such that flat sheet-shaped tubular sheet bodies are spaced apart and welded in parallel, and the parallel welded portions A sheet heat-welding and cutting device for cutting a space, wherein a groove portion is formed in a central portion in a transport path of the flat sheet-like tubular sheet body in a direction intersecting a transport direction of the transport path. A fixed seal block is provided and a movable body is arranged so as to be able to move forward and backward with respect to the conveying path. When the movable body descends, the groove portion of the fixed seal block provided in the conveying path of the tubular sheet is moved. An endless band saw that is rotatably supported by a plurality of rollers is provided with movable seal blocks that are positioned on both sides of the endless band saw and are urged by springs in a direction of pressing against the fixed seal block. Previous The movable body is provided with a polishing body for polishing the blade portion of the band saw.

(Operation) In the apparatus for heat-sealing and cutting the sheet-like body of the present invention, the tubular sheet-like body in the conveying path is urged by the spring by rotating the band saw and advancing the movable body into the conveying path. It was sandwiched between the movable seal block and the fixed seal block, and was heat-welded in parallel in two rows with a gap, and this tubular sheet was formed on the fixed seal block while sandwiched between the fixed seal block and the movable seal block. A band saw is used to cut between the heat-welded portions located in the grooves. Then, by rotating the band saw, the band saw is polished by the polishing body.

(Embodiment) An embodiment of the sheet heat-welding and cutting apparatus of the present invention will be described with reference to the drawings.

FIG. 1 shows a heat welding and cutting device part of a bag making machine, which is a long tube made of a thermoplastic synthetic resin film such as polyethylene resin as described in FIGS. 3 and 4. The shopping bag 1 is manufactured from the sheet-shaped body 2. The illustrated portion intermittently conveys the tubular sheet 2 by the length of the shopping bag 1, and when the tubular sheet 2 is stationary. , The tubular sheet-like bodies 2 are separated and heat-welded in parallel, and the heat-welding portions 5 are cut to form a bag body 6 with both ends closed, and the bag bodies 6 are bundled. .

2a is a conveying path for the cylindrical sheet body 2, and the conveying path 2a is
It is set on a horizontal plane, the conveying rollers 11 and 12 are arranged above and below it, a fixed body 13 is arranged in front of the lower conveying roller 12, and a groove portion is formed in the central portion above the fixed body 13. A fixed seal block 14 for heat fusion, which is U-shaped in side view, is attached.

A pedestal 15 is arranged in front of the fixed body 13, and the pedestal 15 is provided.
A hot pin 16 for bundling with heat fusion is disposed on the fifteen, and the hot pin 16 is projected and retracted on the upper surface of the pedestal 15 by the air cylinder 17.

Further, a receiving plate 18 is attached to the front part of the receiving table 15 so as to be vertically rotatable.

Further, an elevating body 21 as a movable body is provided above the fixed body 13 and the pedestal 15 so as to be able to move up and down. The movable seal blocks 22 and 23 to be worn are supported by a spring 24 so as to be movable up and down within a predetermined range while being constantly urged downward.

In front of the pair of seal blocks 22 and 23, an insert 25 for the pedestal 15 is provided to be movable up and down, and a through hole 25 for the hot pin 16 is formed in the insert 25.

Further, below the elevating body 21, a driving roller 31, a tension roller 32, and a guide roller are arranged in an arrangement as shown in FIG.
33 and and two pairs of angle changing rollers 34 are provided, and an endless band saw 35 is supported by the rollers 31, 32, 33 and the angle changing roller 34. A part of the band saw 35, that is, a part between the two pairs of angle changing rollers 34 is arranged along the space between the pair of front and rear movable seal blocks 22 and 23, and is a fixed seal block of the transport path 2a of the tubular seal body 2. The band saw 35 is arranged along the groove 14 and is rotated by the motor 36 so that the band saw 35 rotates along the rollers 31, 32, 33 and the angle changing roller 34. .

Further, the band saw 35 has a pair of polishing rollers 37 as a polishing body composed of a round bar-shaped grindstone rotatably supported in a portion between the drive roller 31 and the tension roller 32.
And a pair of lubricating rollers 38 impregnated with a silicon lubricant.

It should be noted that the angle changing roller 34 moves the band saw 35 between the pair of movable seal blocks 22 and 23 in the conveying path 2a.
It is held perpendicular to the tubular seal body 2.

Next, the operation of this embodiment will be described.

The band saw 35 is always rotated by the motor 36 via the drive roller 31 in the direction of the arrow in FIG. 2, and in this state, the pair of upper and lower transport rollers 11 and 12 are synchronized and are intermittently moved in the direction of the arrow in FIG. The cylindrical seal-like body 2 that is rotated between the conveying rollers 11 and 12 is intermittently conveyed by the length of the shopping bag 1 and is sandwiched between the conveying rollers 11 and 12. When stationary, the elevating body 21 and the inserting body 25 descend by predetermined strokes.

Due to the lowering of the elevating / lowering body 21, the pair of front and rear movable seal blocks 22 and 23 descend to the U-shaped fixed seal block 14 on the upper side of the fixed body 13 and move between the pair of movable seal blocks 22 and 23. The band saw 35 descends into the groove portion of the fixed seal block 14, and the tubular sheet body 2 is sandwiched between the movable seal blocks 22 and 23 and the fixed seal block 14.
Furthermore, with the movable seal blocks 22 and 23 stopped,
Band saw 35 is fixed together with lifting body 21 Fixed seal block 14
A few millimeters descend into the groove portion, and the heat of the fixed seal block 14 and the movable seal blocks 22 and 23 forms a heat welded portion 5 in parallel with the tubular seal body 2 in parallel with the two welded portions. The space between 5 is cut by the band saw 35 to form the bag body 6.

Further, when the insertion body 25 descends, the through hole 26 of the insertion body 25 is fitted into the hot pin 16 protruding above the pedestal 15, and the bag body 6
Is inserted into hot pin 16.

After that, the elevating body 21 and the inserting body 25 are respectively moved up by a predetermined stroke to return to the starting position, and the conveying rollers 11 and 12 are moved.
The next transportation will be performed.

In this way, the long-sized tubular seal-like body 2 is successively formed into the regular-sized bags 6, and the formed bags 6 are hot pins.
Inserted in 16 and bundled.

Then, the bundled bags 6 are surrounded by the hot pins 16 by the heat of the hot pins 16 (a peripheral portion of the hole 9 shown in FIG. 4).
In this state, the upper and lower parts are fused and integrated, and in this state, the hot pin 16 is lowered by the air cylinder 17 to send the bundle of the integrated bag bodies 6 to the next step.

Since the band saw 35 is constantly rotated by the motor 36 via the drive roller 31 in the direction of the arrow in FIG. 2, the band saw 35 comes into contact with the polishing roller 37 and is constantly polished, and is further polished. Immediately after the band saw 35 comes into contact with the lubrication roller 38 and the silicon lubricant is applied, the cutting edge of the band saw 35 is always maintained in a sharp state, and therefore the occurrence of blade spillage is reduced, resulting in wear of the cutting edge. It is not necessary to stop the bag-making machine due to spilling of blades or the like, and continuous use for a long time becomes possible.

(Effects of the Invention) According to the present invention, the tubular sheet-like body is cut with a band saw between the two spaced heat-welded portions, and the band saw is polished by the polishing body when the band saw travels. The blade edge of the band saw is always kept sharp, and the occurrence of blade spilling is reduced. As a result, it is not necessary to stop the cutting operation due to wear of the blade edge or blade spilling, and continuous use for a long time becomes possible.

[Brief description of drawings]

FIG. 1 is a schematic side view of a part of a bag-making machine showing an embodiment of the sheet heat-sealing and cutting apparatus of the present invention, and FIG. 2 is a plan view of an essential part of the same, and FIG. FIG. 4 is a front view of a bag manufactured by the same as above, FIG. 4 is an explanatory view of the manufacturing process thereof, and FIGS. 5 to 7 are perspective views of different sheet-shaped cutting devices. 2 ... Cylindrical sheet, 2a ... Conveyance path, 14 ... Fixed seal block, 21 ... Elevating body as movable body, 22,23 ......
Movable seal block, 24 …… Spring, 31,32,33,34
...... Roller, 35 …… Band saw, 37 …… Abrasion roller as an abrasive body.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A heat welding and cutting device for a sheet-like material, comprising: a flat sheet-shaped sheet-like body spaced apart from each other and welded in parallel; A fixed seal block having a groove formed in the central portion in a direction intersecting the transport direction of the transport path is disposed in the transport path of the cylindrical sheet body that is folded into a shape, and is arranged to be movable back and forth with respect to the transport path. When the movable body descends, the endless band saw that moves in the groove of the fixed seal block provided in the conveying path of the tubular sheet is rotatably supported by a plurality of rollers and the endless band saw is supported. The movable seal blocks, which are located on both sides of the band saw and are urged by springs in the direction of pressing against the fixed seal block, are provided, and the movable body is provided with a polishing body for polishing the blade portion of the band saw. Special A device for heat-sealing and cutting sheets.