JPH0430084Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a sealing device that heat-welds the opening of a synthetic resin bag and prints various designs.

[Conventional technology and its problems]

For example, this type of device will be described with reference to FIGS. 1 and 2. A synthetic resin bag a is conveyed in the lateral direction (horizontal direction) on the front surface of the device base 1 with its opening protruding rearward. A belt conveyor 2 is provided, and above and below along the rear edge of this belt conveyor 2,
A pair of endless belts 3 and 4 that sandwich the synthetic resin bag a with the conveying surface as a boundary are provided so as to be able to run, and halfway inside the pair of endless belts 3 and 4,
A seal bar 5 made of a hot plate that heat-seals the opening of the synthetic resin bag a, a press roller 6, a cooling bar 7,
It is equipped with a design roller 8, and as shown in Fig. 2, the synthetic resin bag a is placed on the belt conveyor 2, and its opening is held between the endless belts 3 and 4, and the bag is moved from right to left in Fig. 1. Then, in the middle of the process, the pair of seal bars 5, 5 press and heat-seal the opening of the synthetic resin bag a via the endless belts 3, 4, and the sealed portion is pressed against the opening of the synthetic resin bag a by the pair of press rollers 6, 6. After being brought into pressure contact with each other, it is cooled by a pair of cooling bars 7, 7, and then, as shown in FIG. 4, various designs b are printed by a pair of design rollers 8 and sent out to the left.

In this sealing device, after the design is printed, steps such as cutting off the excess portion of the opening of the bag a as shown in FIG. 4a or making perforations C as shown in FIG. 4b may be performed.

The conventional means for this slitting cut and perforation cutting is as shown in FIG.
A suritsutakatsu is made using a clipper.

However, synthetic resins such as polyethylene
Because it is highly flexible and malleable, it cannot be cut smoothly with such a sandwich. Furthermore, because the bag cannot be cut smoothly and the opening of the bag is stretched, the cut line becomes bent or oblique with respect to the design B and the seal line, which often results in defective products.

[Purpose of invention]

With the above points in mind, this invention aims to provide a sealing device that can cut smoothly and have a uniform cut line.

[Means to achieve the purpose]

In order to achieve the above object, in this invention, a synthetic resin bag is moved horizontally by a belt conveyor, and during this process, the opening of the synthetic resin bag is heat-sealed by a hot plate, and the opening of the bag is In a synthetic resin bag opening sealing device in which a design is printed using upper and lower design rollers, a disc-shaped perforation blade or slitting blade is attached to one rotational shaft of the design roller, and the other rotational shaft A receiving pulley was attached to the blade to which the cutting edge came into pressure contact.

[Effect]

The sealing device configured in this manner performs heat sealing and design printing in the same manner as in the past, but simultaneously with design printing, slit cutting or perforation cutting is performed by the push-cutting action of the blade and pulley.

〔Example〕

Embodiments of this invention will be described below with reference to the accompanying drawings FIGS. 1 to 4.

As shown in FIGS. 1 and 2, a lateral belt conveyor 2 is provided on the front surface of an apparatus base 1, as in the prior art. A pair of endless belts 3, 4 made of heat-resistant material such as iron are installed above and below the rear edge of the belt conveyor 2, with the conveying surface as the boundary.
is provided so that it can run at the same speed in synchronization with the conveyor 2, and the synthetic resin bag a is placed between the pair of endless belts 3 and 4 by hand or the like at the right end of the conveyor 2, with its opening protruding backwards. When the bag a is placed so as to be sandwiched between the endless belts 3 and 4,
move to the left with its mouth held between the two.

Seal bars 5, 5 made of hot plates, a press roller 6, a cooling bar 7, and a design roller 8 are provided in sequence in the middle of the endless belts 3, 4, and the seal bars 5, 5 are sandwiched by the bag a. In this state, the belts 3 and 4 are pressed together with such force that the belts 3 and 4 can pass through this area, and the opening of the bag a is heat-sealed by passing through this area. After being pressed, it is cooled by cooling bars 7, 7, and then various designs b are printed by a design roller 8.

The lower rotating shaft 9a of the design rollers 8, 8
is supported by the fuselage frame F, while the upper rotating shaft 9b is connected to the drive pulley 10 of the endless belt 3.
A shaft 12' with a spring 12a loosely fitted to the frame F is protruded from the tip of the arm 11, as shown in FIG. By turning the nut 12, the arm 11 swings through the shaft 12', and the gears 13a and 13b of both rotating shafts 9a and 9b engage or disengage. In addition, the lower rotating shaft 9a is connected to a sprocket 15 on the output shaft 14 of a reducer that is linked to the drive machine of the device.
This drive mechanism rotates the design rollers 8, 8 in synchronization with the conveyor 2 so that their speed and circumferential speed are the same.

Both design rollers 8, 8 have rotating shafts 9a, 9b.
The disc-shaped slitter blade 17 and the receiving pulley 18 made of synthetic resin such as nylon or zyuracon are each removably attached to the inside of the slitter blade 17 and its blade edge is pressed into contact with the slitter blade 17. Therefore, both gears 13 are connected by the nut 12.
When the synthetic resin bag a reaches the design rollers 8, 8 as shown by the chain line in FIG. The design is printed by both design rollers 8, 8, and the opening of the bag a is slittered as shown in FIG. 4a by pressing the slitter blade 17 against the pulley 18 through the bag a. Since this sliver cutting is a push cut, there is no bending of the synthetic resin bag a compared to a pinch cut, and the bag is cut smoothly. Moreover, since it is coaxial with the design roller 8, the slit wire will not be inclined with respect to the design b.

If a perforation blade is used in place of the slitting blade 17, it is possible to obtain the perforation c shown in FIG. For example, Fig. 4b
Perforations c can be formed inside design b, as shown by the chain lines.

[Effect of idea]

This invention is constructed as described above and forms slits and perforations by pressing and cutting, so that the effect of smooth operation can be obtained, and the design roller and slitting blade or perforation blade can be used together. Since they are on the same axis, there is an effect that the slitting line or perforation line does not shift with respect to the design etc.

[Brief explanation of drawings]

Figure 1 is a schematic front view of an embodiment of the sealing device according to this invention, Figure 2 is a right side view of Figure 1, and Figure 3 is a right side view of Figure 1.
The figures are an enlarged cut-away left side view of the main part of Figure 1, Figure 4a,
b is an explanatory diagram of the operation, and FIG. 5 is a cutaway side view of the main part of the conventional example. a...Synthetic resin bag, b...Design, c...Perforation, 2...Belt conveyor, 3, 4...Endless belt, 5...Seal bar, 8...Design roller, 9a, 9b...Rotation Axis, 13a, 13
b...gear, 17...sliver blade, 18...receiver pulley.

Claims (1)

[Scope of utility model registration request] The synthetic resin bag is moved horizontally by a belt conveyor, and along the way, the synthetic resin bag opening is heat-sealed by a hot plate, and a design is printed on the bag opening by upper and lower design rollers. The bag opening sealing device is characterized in that a disc-shaped perforation blade or slitting blade is attached to one rotating shaft of the design roller, and a receiving pulley is attached to the other rotating shaft, the blade edge of which is in pressure contact. Synthetic resin bag opening sealing device.