JPS6333894Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is intended to facilitate the unwinding of the yarn to be processed when it is pulled out from the bobbin in, for example, a synthetic fiber filament drawing/twisting machine or drawing/false twisting machine. This invention relates to a bobbin cap that is fitted onto the tip of a bobbin.

Conventionally, a bobbin cap has been generally used in which hook-shaped leaf springs b to b inscribed in the bobbin are fixed to the inner surface of a disc-shaped cap body h, as shown in Fig. 1. Not only does the number of parts increase and a process for assembling each part is required, but also because the leaf spring b protrudes from the cap body h, it may fall off or become deformed due to entanglement or interference with the other parts. It is susceptible to damage, and the gripping force of the bobbin cap on the bobbin fluctuates due to deformation or relaxation of the leaf spring b, or a decrease in elasticity, making the position in which the bobbin cap is inserted into the bobbin unstable. There were some defects that made it difficult to remove, and some that made it difficult to determine whether the fitting was properly fitted.

SUMMARY OF THE INVENTION In view of the above drawbacks, an object of the present invention is to provide a bobbin cap that can simplify the operation of fitting and removing the cap onto the bobbin, enhance the gripping effect on the bobbin, and stabilize the position of the bobbin when it is fitted onto the bobbin.

Next, an embodiment of the present invention will be explained with reference to the drawings.
In the bobbin cap C, which is integrally molded of hard synthetic resin or the like to be removably fitted to the tip of the bobbin cap, it is a guide plate for guiding the circumference of the yarn to be unwound, It is formed into a substantially circular ring shape with an opening 2, and a groove 1a for inserting the tip of the bobbin B is recessed around its inner surface.
Furthermore, on the circumferential surface of the opening 2, there are four relief parts 1b to 1b.
1b is recessed.

Reference numeral 3 denotes a fitting piece which is integrally provided along the periphery of the opening 2 on the inner surface of the guide plate 1 in order to fit into the tip of the bobbin B. Arranged arc-shaped protrusions 3a~
3a, and each protrusion 3a
Separation portions 3b to 3b are provided in between, respectively.

Reference numeral 4 denotes a gripping piece that is concentrically connected to the fitting piece 3 in an internally fitting manner, and in this example, there are four concave curved parts 4.
a to 4a and four concave curved parts 4b to 4b are arranged alternately in a substantially four-lobed frame shape so that it can be elastically deformed. 3a are integrally connected via left and right connecting pieces 5, 5.

The tips 6 to 6 of each convex curved portion 3b are exposed through each separation portion 3b of the fitting piece 3, and a circular arc surface a connecting the outer circumferential surface of the protrusion 3a is compressed to the inner circumferential surface B1 of the bobbin B. When the bobbin cap C is fitted to the tip of the bobbin B, the bobbin B can be held by each convex curved part 4b of the gripping piece 4, while being restrained by the upper and lower protrusions 3a shown in the figure. When both release-side concave curved portions 4a that are not released are pressed centripetally in the directions of arrows P and P with fingertips, each curved portion 4a, 4b is elastically deformed, each convex curved portion 4b is slightly inclined, and each convex The tip 6 of the curved portion 4b is retracted inward of the arcuate surface a (see the chain line in FIG. 2) and separated from the inner circumferential surface B1 of the bobbin B. Therefore, the distal end 6 of each convex curved portion 4b is brought into contact with and separated from the inner circumferential surface B1 of the bobbin B by the releasing and pressing operations on both the release side concave curved portions 4a, and the bobbin cap C is fitted onto the bobbin B distal end. You can escape.

Next, the operation and effects of the embodiment having the above configuration will be explained.

Now, in this example, a gripping piece 4 is concentrically connected to a fitting piece 3 which is protruded along the inner circumferential edge of the opening 2 of the guide plate 1 having a substantially circular ring shape to fit into the tip of the bobbin B. The concave curved portion 4a and the convex curved portion 4b
and are arranged alternately in the circumferential direction so as to be elastically deformable, and the tip 6 of each convex curved part 4b is connected to the bobbin B through the cutout part 3b provided in the fitting piece 3. It is exposed so that it can come into contact with and separate from the inner circumferential surface B1.

For this reason, both release side concave curved portions 4a of the gripping piece 4
By centripetally pressing and releasing the bobbin cap C, the bobbin cap C can be easily fitted onto and removed from the tip of the bobbin B, and when the bobbin cap C is fitted onto the bobbin B, the bobbin B can be moved radially relative to the inner circumferential surface B1. It has the advantage of being able to securely hold the bobbin cap C by each convex curved portion 4b that presses against it, stably maintain the fitted posture of the bobbin cap C, and prevent the bobbin cap C from moving or coming off due to vibrations, shocks, etc.

In particular, since the convex curved portions 4b that approach and separate from the inner circumferential surface B1 of the bobbin B are integrally connected via the concave curved portions 4a, it is possible to equalize the pressing force in each direction on the bobbin B. This has the effect of suppressing the tendency of this pressure contact force to decrease over time.

Furthermore, since the fitting state of the fitting piece 3 and the gripping piece 4 into the bobbin B can be seen through the opening 2 from the front of the guide plate 1, it is possible to easily determine whether the fitting condition of the bobbin cap C is proper or not. .

Furthermore, since the entire bobbin cap C is integrally molded, it is possible to eliminate assembly members and the assembly process of the members, and the gripping piece 4 is housed inside the guide plate 1 and the fitting piece 3. However, since local protrusions from the guide plate 1 and the fitting piece 3 are eliminated, the appearance is improved and entanglement with other objects and mutual interference can be prevented. That is, the present invention has a concave curved portion and a convex gripping piece connected concentrically to a fitting piece that protrudes along the inner periphery of the opening of a roughly circular guide plate to fit into the tip of the bobbin. The convex curved portions are arranged alternately in the circumferential direction and are elastically deformable in a substantially biplane-shaped frame shape, and the tips of each of the convex curved portions are inserted into the fitting piece in order to insert the same tip. By configuring it so that it can come into contact with and separate from the inner circumferential surface of the bobbin through the respective cut-off portions, it is possible to simplify the operation of fitting and removing the bobbin and to stabilize the fitting posture. This is an extremely practical idea for a bobbin cap.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional bobbin cap, Figure 2 is a perspective view of a conventional bobbin cap.
Figures to Figure 4 show one embodiment of the present invention, Figure 2 is a rear view, Figure 3 is a sectional view taken along the line X-X of Figure 2, and Figure 4 is a half side taken along the line Y-Y. FIG. 1... Guide board, 2... Opening, 3... Fitting piece, 3b
...Separation part, 4...Gripping piece, 4a...Concave curved part, 4b
...Convex curved portion, B...Bobbin, C...Bobbin cap.

Claims (1)

[Scope of utility model registration request] A gripping piece concentrically connected to a fitting piece protruding along the inner periphery of the opening of the approximately circular guide plate to be fitted into the tip of the bobbin is formed into a concave curved part and a convex curved part. are arranged alternately in the circumferential direction and are elastically deformable in a substantially biplane-shaped frame shape, and the tip of each of the convex curved portions has a cut formed in the fitting piece so that the tip can be inserted. A bobbin cap characterized in that it is exposed through a separation part so as to be able to come into contact with and separate from the inner peripheral surface of the bobbin.