JPS6110963Y2 - - Google Patents

Description

[Detailed description of the invention] This invention allows the core mold to be easily molded from the tubular molded product by blowing compressed air between the elastic tubular molded product such as an air duct and its core mold. This invention relates to an improvement of a die-cutting jig for die-cutting.

For example, a rubber air duct 1 formed into a bendable bellows shape is molded in a mold using a cylindrical core mold 4 in addition to an upper mold 2 and a lower mold 3, as shown in FIG. However, when removing the core mold 4 after molding, it is difficult to pull it out as it is, so compressed air is blown between one end of the air duct 1 and the core mold 4 to slightly expand the air duct 1. A method is adopted in which the material is pulled out after it has been released from the mold.

As shown in FIG. 2, the conventional die-cutting jig used for blowing compressed air consists of a bottomed cylindrical air blowing tube 5 into which the compressed air is fed, and a pair of semicircular bands that can be opened and closed. The open end of the air blowing tube 5 is inserted between the core mold 4 and the air duct 1, and
Tighten the clamp 6 from above, and
The end portion is firmly held between the air blowing tube 5 and the clamp 6.

However, in the conventional die-cutting jig described above, the clamp 6 is a separate member from the air blowing tube 5, and it is necessary to remove the clamp 6 for each die-cutting operation. The operation cannot be performed with one hand; the clamp 6 must be held with one hand and the clamp lever 6a must be operated with the other hand, making the holding of the air duct 1 unstable and resulting in extremely poor work efficiency. Moreover, there were many accidents such as the air blowing cylinder 5 coming off due to the compressed air and hitting the worker, or the clamp 6 pinching the worker's fingers.

This idea was devised in view of the above-mentioned drawbacks of the conventional methods. Compressed air introduced into the air blowing tube is used to hold the ends of the tubular molded product, making it extremely easy to operate as it can hold the molded product and cut the mold at the same time. The present invention provides a die-cutting jig for tubular molded products with good quality.

Hereinafter, one embodiment of this invention will be described in detail based on FIGS. 3 and 4.

First, the air blowing cylinder 11 has a cylindrical shape with a bottom and one end is sealed, and a stepped part 11a is formed at the open end inserted between the air duct 1 and the core mold 4, and the inner circumference of the air duct 1 is formed with a stepped part 11a. The air pipe (compressed air passage) 22 is fixed to the air pipe 22, which is designed to bite into the air pipe and communicate with a guide member 13, which will be described later. 13
There is a bracket 14 on the outer periphery of this air blowing cylinder 11.
an annular retaining tooth guide member supported through the
This retaining tooth guide member 13 consists of a front plate 15, a rear plate 16, and a ring 17.
and the screw 19... through the spacer 18...
By stopping, the spacers 18 have a substantially U-shaped cross section, and arc-shaped retaining teeth 20 are held between each spacer 18 so as to be movable back and forth in the radial direction. A band-shaped rubber sheet 21 is disposed inside this retaining tooth guide member 13 over its entire circumference, and is sandwiched on both sides by both end surfaces of the ring 17.
An air pipe 22 communicating with the bottom is connected. Then,
When compressed air is introduced from the compressed air inlet 12, this rubber sheet 21 expands and the holding teeth 20...
It is designed to press in the inner radial direction. Incidentally, the same effect can be obtained even if an expandable rubber tube is used instead of the band-shaped rubber sheet 21. The compressed air inlet 12 and the air pipe 22 may be provided in one place or in several places as appropriate.
2. When the air pipes 22 are provided at a plurality of locations, the rubber sheet 21 may be divided and provided accordingly.

Moreover, the same effect can be obtained by introducing compressed air into the air blowing cylinder 11 first and then into the holding tooth guide member 13 in the opposite manner to the above.

To cut out the core mold 4 from the air duct 1 using the mold cutting jig configured as described above, the air blowing tube 11 is inserted between the air duct 1 and the core mold 4, and then the compressed air source is turned on. When the valve is opened, the introduced compressed air is guided into the retaining tooth guide member 13, thereby causing the retaining teeth 20...
is pressed in the radial direction to sandwich the air duct 1 with the air blowing tube 11, and the inner end 20
a bites into the air duct 1 and holds it firmly.
At the same time as this air duct 1 is held, the air is introduced into the air blowing tube 11 through the air pipe 22 and blown between the air duct 1 and the core mold 4, and as a result, the air duct 1 is separated from the surface of the core mold 4. Since it expands after being molded, the core mold 4 can be smoothly pulled out from the air duct 1 fixed by this mold removal jig.

As is clear from the above explanation, according to the mold cutting jig for tubular molded products according to this invention, compressed air used for mold cutting can be used to simultaneously cut air ducts, etc., without special operations such as clamps. The end portion of the tubular molded product can be held, and work efficiency can be significantly improved compared to the conventional method. In addition, since it uses air pressure, a sufficiently strong holding force can be obtained, so it will not come off during work, and there is no risk of accidents caused by pinching fingers as in the conventional case.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram schematically showing a mold for air ducts, Fig. 2 is an explanatory diagram of a conventional die-cutting jig, and Fig. 3 is an explanatory diagram schematically showing a mold for an air duct.
The figure is a half-sectional side view of the die-cutting jig according to this invention, and FIG. 4 is a half-sectional front view of the same. DESCRIPTION OF SYMBOLS 1... Air duct, 4... Core type, 11... Air blowing tube, 12... Compressed air inlet, 13... Holding tooth guide member, 20... Holding tooth, 21... Rubber sheet, 22... air tube.

Claims (1)

[Scope of utility model registration request] An air blowing cylinder having a bottomed cylindrical shape that can be inserted between an elastic tubular molded product and its core mold, and to which a compressed air passage is connected, and an air blowing cylinder arranged along the outer periphery of the air blowing cylinder. , and a retaining tooth guide member that communicates with the compressed air passage and into which compressed air is introduced; A die-cutting jig for tubular molded products, which is comprised of retaining teeth that clamp the molded product between the air blowing cylinder and the air blowing cylinder.