JPS6037220Y2 - lightweight spacer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lightweight spacer suitable for use in a slitter or the like for cutting steel plates into desired dimensions.

Conventionally, this type of lightweight spacer made of resin has been developed in order to improve the safety and reduce the spacer replacement work for spacers used in the above-mentioned slitters, etc.; In other words, a cylindrical resin pipe 1 is provided with through holes at a constant pitch in the circumferential direction of its cross section, and steel pins 2 are inserted into the through holes.
It consists of a structure in which .

However, with this type of structure, (1) it is necessary to process many pin holes and press fit the pins, and the holes for the pins must be made accurately to avoid deviations in position, direction, and size; It is required to be processed into

(2) If dimensional changes occur due to resin, heat, or moisture absorption, there is a possibility that the punching will fail.

(3) When adjusting the width by combining multiple spacers to set a predetermined width, even if the positions of the mutual pins are slightly shifted, the contact between the pins tends to deteriorate, reducing the accuracy of the width adjustment. Therefore, the position, direction, and size of the pin hole as well as the accuracy of keyway machining are required.

(4) There are various problems such as the parallelism of the pins being distorted due to distortion due to heat, moisture absorption, internal stress, etc. of the resin, and it cannot be said that the performance as a spacer is even remotely adequate.

It is therefore an object of the present invention to provide a spacer which solves the above-mentioned problems.

The spacer of the present invention, which is suitable for such a purpose, utilizes an annular insert having a plurality of through holes on its circumferential surface, which is buried in a resin pipe with its center axis aligned, and both ends of the insert are connected to both end surfaces of the resin pipe. Consistent with or in a point made conspicuous by it.

Hereinafter, the present invention will be explained in more detail with reference to the accompanying drawings.

3 to 5 are front views of each insert used in the spacer according to the present invention, FIG. 6 is a sectional view of a spacer using the insert shown in FIG. 3 or 4, and FIG. 7 is a front view of each insert used in the spacer according to the present invention. FIG. 6 shows a spacer using the insert shown in FIG. 5;

The insert 4 shown in FIGS. 3 and 4 is made of a steel pipe, and has a plurality of through holes 6 on its annular circumferential surface 5 at required intervals.

The shape of this through hole 6 is square (Fig. 3), circular (
The shape is not limited to the shape shown in FIG. 4), and various other shapes may be used.

This through hole 6 is provided as a spacer to improve the bond between the resin and the insert.

Further, the insert 4 shown in FIG. 5 is also a steel pipe, but through holes 7 are formed by hollowing out both ends of the circumferential surface at regular intervals.

These annular inserts 4 having various shapes are buried in a resin pipe 8 having a certain wall thickness with their central axes aligned, and both ends of the insert are aligned with both end surfaces of the resin pipe, and Make it stand out.

The spacer 3 of the present invention has a structure as shown in Narukami, and in this way, even if the spacer 3 is attached to a rotating shaft, the center axes of the insert 4 and the resin pipe 8 can be aligned. Therefore, there is an advantage that the inner circumferential surface of the spacer 3 is less likely to wear unevenly.

In addition, when installing multiple spacers 3 on a shaft to provide a constant width, the positions of the inserts 4 of each spacer 3 match and the end faces of each insert come into contact, so an accurate width that is difficult to fluctuate can be set. .

On the other hand, if a spacer 3 is used in which the central axes of the insert 4 and the resin pipe 8 do not match, the insert 4 of each spacer will contact at two points and the contact area between the inserts will decrease, making it difficult to accurately set the width. I won't be able to do it.

Furthermore, as described above, in the present invention, both ends of the insert 4 match or protrude from both end surfaces of the resin pipe 8, so the inserts 4 come into contact with each other, so it is difficult to set an accurate width. It has the characteristic of being able to

If both ends of the insert 4 are located inside from both end surfaces of the resin pipe 8, even if a plurality of spacers 3 are combined, the resins will come into contact with each other, making accurate width adjustment impossible.

Next, as for the means for molding the spacer 3 of the present invention as described above, for example, in the case of casting nylon resin, a hole penetrating the circumferential surface is provided in a cylindrical mold of a desired size. A steel pipe was fixed with its axis aligned with the mold, and a strong alkaline catalyst and a compound known as an initiator for anionic polymerization of lactams such as N-acyl-E-caprolactam and N-carbamoyl-E-caprolactam were added and mixed. The E-caprolactam solution was poured in, and the mold was rotated around its axis while the so-called activated anionic polymerization of E-caprolactam was carried out, and the bottom was shaped into a pipe by centrifugal force.
This can be carried out by the method disclosed in Japanese Patent No. 303.

However, if you do not have a rotary molding machine, you may form the steel pipe into a rod shape without rotating the mold, and then hollow out the center to form the pipe-shaped spacer of the present invention.

The spacer of the present invention can also be obtained by a method in which the steel pipe is fixed in a pipe-shaped space of a double cylindrical mold and resin is cast.

Each spacer obtained by the following method can be cut into a width suitable for the purpose in a direction perpendicular to the spacer axis, and can be used as a spacer of the present invention.

As shown in FIG. 8, the usage of the spacer according to the present invention, which has gained popularity as described above, is as shown in FIG.
Steel plate 12 sent by rotating 0.11
It is inserted into the blade 9 and attached to the slit etc. to be cut, and used as a spacer.

As described above, the spacer according to the present invention has a steel pipe insert with multiple through holes embedded in a resin pipe, so compared to conventional spacers, (1) resin and steel pipes are integrally molded. This eliminates the need for time-consuming operations such as drilling pin holes and press-fitting pins.

(2) Since the resin is integrated through the hole provided in the steel pipe, there is no possibility that the insert will fall off even if the resin changes in size.

(3) When combining multiple spacers to increase their width, since the inserts have a width in the circumferential direction instead of the conventional so-called dot-shaped pins, the contact area between the inserts is large, and the positions of the inserts may be slightly different from each other. Even if the inserts are misaligned, the contact between the inserts is very good, and the precision of keyway machining is not required.It has various effects, and is very effective as a lightweight spacer.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a conventional spacer, FIG. 2 is a sectional view taken along line AA' in FIG. FIG. 6 is a front view of an insert example, FIG. 6 is a longitudinal sectional view of a spacer according to the present invention using the insert shown in FIGS. 3 and 4, and FIG.
FIG. 8 is a vertical cross-sectional view of a spacer according to the present invention using the insert shown in the figure, and FIG. 8 is a diagram schematically showing an assembly diagram of a slitter for cutting a steel plate as an example of the use of the spacer according to the present invention. 1.8... Resin pipe, 3... Spacer of the present invention, 4... Insert, 5... Circumferential surface, 6°7... ・...Through hole.

Claims (1)

[Scope of utility model registration request] An annular insert having a plurality of through holes on the circumferential surface is embedded in a resin pipe in such a manner that their center axes are aligned, and both ends of the insert are aligned with or protrude from both end surfaces of the resin pipe. A lightweight spacer featuring: