JPH0219623Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a band brake used in single-tub type dehydrating washing machines and the like.

Structure of the conventional example and its problems The problems of the conventional example will be explained with reference to FIG.

At the bottom of the dewatering/washing tub 1, a clothes stirring blade 2 is supported so as to be rotatable in forward and reverse directions, and at the outer bottom of the dehydrating washing tub 1,
A flange 4 connected to the dewatering shaft 3 is fixed.
The lower end of the dewatering shaft 3 is connected to a brake wheel 5, and the dewatering rotation can be communicated via the brake wheel shaft 6 to a drive boss 8 around which a clutch spring 7 is wound. A driven pulley 9 is fixed to the drive boss 8 with a screw 10 or the like. 11 is a motor, and the rotation of the pulley 12 is interlocked with the driven pulley 9 via a V-belt 13.

The dewatering shaft 3 and the brake wheel shaft 6 are rotatably supported concentrically by ball bearings 14, 14'. 15 and 16 are an upper bearing box and a lower bearing box, which house the brake wheel 5 and ball bearings 14, 14'. A brake band 18 having a brake shoe 17 laminated on its inner surface is tightly and removably wound around the outer periphery of the brake wheel 5 described above, and one end of this brake band 18 is fixed to the lower bearing box 16, and the other end is fixed to the lower bearing box 16. is rotatably supported by a pin 21 attached to the tip of an operating lever 20 which is rotatably supported by a shaft 19 inserted into the upper and lower bearing boxes 15 and 16.

By rotating the operating lever 20, the brake band 18 is attached to and detached from the brake wheel 5 via the pin 21.

The operating lever 20 is biased in a predetermined direction by a spring (not shown) or the like so that the brake band 18 comes into close contact with the brake wheel 5.

In order to improve productivity, technical means such as adhesion are often used to fix the brake band 18 and the brake shoe 17, and the production of the brake shoe 17 requires sheet material with a relatively large area. It is common to cut the material into a predetermined shape. The brake band 18 is as shown in FIG.
Brake wheel 5 is made of thin steel plate, etc.
The brake band 18 is machined into a circular shape along the outer periphery, and the brake shoe 17 is attached to the inner periphery of the brake band 18. A pin insertion hole 22 is formed at one end of the brake band 18, and a fixing part 23 is formed at the other end. are doing.

The brake shoe 17 is made by pressing from sheet material, but in order to improve the material removal, the third
As shown in the figure, the upper punch incisor 24 and the lower die incisor 25 are used to cut the material 26 by sequentially feeding it in the A direction. At this time, they are next to each other,
If no gap is provided between the brake shoes 17 and 17', the shape of the cut portion will be an arc 28 at the corner on the punch incisor 24 side, as shown in FIG. An edge-shaped corner 27 was often formed on the 25 side. On the other hand, if I make the following cuts:
The arc 28' of this corner and the edge corner 27' are formed with the front and back reversed, so the brake shoe 17
The cut portions on both sides had a defect in that the corner shapes were different.

The brake shoe 17 like this is connected to the brake band 18.
When pasted with adhesive etc., the edge corners 27, 27'
The edges are located on the inner and outer peripheries of the circle, causing problems in adhesion to the brake band 18, and the corner edges formed on the inner periphery adversely affect contact with the brake drum. In addition, since it is processed from sheet material,
The front and back surfaces are relatively smooth, and the brake band 1
8, the adhesive would protrude to both sides and adversely affect the braking force with the brake drum 5.

Purpose of the invention The present invention was developed to eliminate the problems of the conventional brake system as described above, and it ensures strong adhesion between the brake band and brake shoe and eliminates the effect of adhesive on braking force. .

Structure of the invention In the invention, a brake shoe is formed by molding, and a recess is formed on the adhesive surface of the brake band.

Therefore, this concave portion does not become a pool of adhesive and does not protrude outside. Further, the recessed portion can make use of the trace left by the extrusion pin for separating the mold during brake shoe molding.

DESCRIPTION OF EMBODIMENTS The embodiments of the present invention will be explained below with reference to FIGS. 4 and 5.
This will be explained using figures.

A plurality of recesses 30 are formed on the side of the brake shoe 29 that is bonded to the brake band by the remains of extrusion pins during mold release, and one or more pin-shaped gates are formed during molding. is formed. As the molding material, a moldable thermoplastic resin such as a polypropylene material containing rubber or a nylon material can be used depending on the required braking force of the intended washing machine. Also, brake shoe 2
Since a molded gate pin 31 is formed at 9, if a guide hole or the like is formed in the brake band in correspondence with this, it will serve as a guide when the brake shoe 29 is bonded, making production easier.

The brake shoe 29 has an extrusion pin that is placed slightly convex inside the brake shoe molded product to make it easier to remove it from the mold during the molding process.
A recess 30 that serves as an adhesive reservoir is formed on the adhesive surface side of the brake shoe 29 to prevent the adhesive from spilling out to the outer periphery when adhering to the brake band.

Furthermore, it takes a lot of man-hours to remove the gate pin 31 into a flat shape during post-processing when forming the brake shoe 29, so if you leave it as it is, you can reduce the post-processing after forming, and the brake band It is effective as a guide when bonding. Note that this guide generally requires a certain amount of pressure when gluing, for example.
During this pressing, it also serves to prevent slippage if the adhesive is not sufficiently dry in the initial stage. Furthermore, by molding, the corners of the outer periphery of the braking use surface 29' of the brake shoe 29 can be made with a very small radius, so the braking surface can be made more stable than when it is cut from sheet material. .

Effects of the Invention As described above, the band brake of the present invention has a concave part formed on the brake band adhesion surface of the brake shoe so that the adhesive at the time of adhesion accumulates in this concave part, so that the protrusion is eliminated. This makes it possible to obtain reliable braking action.

In addition, since the brake shoes are obtained by molding, the traces of the extrusion pins for separating the mold can be made into recesses, and therefore no additional machining is required to form the recesses, greatly increasing productivity. It has excellent effects, such as the ability to

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main parts of a dehydrating washing machine using a band brake, Fig. 2 is a perspective view of a conventional band brake, Fig. 3 is an explanatory diagram of the manufacturing process of the brake shoe in the band brake, and Fig. 4 The figure is a perspective view of a brake shoe of a band brake in an embodiment of the present invention, and FIG. 5 is a sectional view of the same brake shoe. 18...brake band, 29...brake shoe, 30...recess.

Claims (1)

[Scope of utility model registration request] A band brake comprising a molded brake shoe and a brake band to which the brake shoe is bonded with an adhesive, and a recess for an adhesive reservoir is integrally formed on the brake band bonding surface of the brake shoe.