JPH01164566A - Expansion/contraction drum for cylinderical polishing member - Google Patents

Abstract

PURPOSE:To facilitate the installation and replacement of a belt sander and prevent the destruction and splashing of the belt sander due to loosening during the polishing work by forming the belt sander having a prescribed diameter to a cylindrical form and installing a drum inside in free expansion and contraction. CONSTITUTION:A rotary shaft 14 is turned in the contraction direction by a handle 21 in the state pressing an outer cylinder 1, and the slide blocks 11 and 12 are equally shifted outside by the actions of the male screw parts 16 and 17 installed in the both edge direction of the rotary shaft 14. The outside pieces 4 and 5 are shifted inwardly by the above-described shift, and at the same time, the divided outer cylinders 1a and 1b are shifted inwardly, and the outside diameter of the drum is contracted. A cylindrical belt sander 20 having a prescribed diameter is fitted onto the outer periphery of the contracted drum. Then, the rotary shaft 14 is revolved in the reverse direction, and the outside pieces 4 and 5 and the divided outer cylinders 1a and 1b are shifted outside, and the drum is expansion-returned to a prescribed diameter, and the belt sander 20 is firmly installed onto the outer periphery of the outer cylinder 1.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a cylindrical abrasive material (hereinafter referred to as "drum sander") which is used by attaching a belt (sheet)-like sander (hereinafter referred to as "belt sander") to the outer periphery of the drum. This relates to an expanding/contracting drum used for things like "sanders", etc., and is also convenient as a rubber roll for conveyance, etc.

[Conventional technology]

Conventionally, as a drum sander, as shown in Figure 9, a shaft (34) is cut in the longitudinal direction of the drum (30).
A belt sander (31) is provided on the outer circumferential surface of 0), and a belt sander stopper (32) is pushed into the groove (34).
The belt sander (31) is tightly attached to the drum (30), or as shown in the diagram, the belt sander (31) is wound spirally around the drum (30) and fixed at both ends with countersunk screws (33). Items that have been prepared have been preserved for a long time.

[Problem that the invention seeks to solve]

The conventional drum sander mentioned above has a belt sander (
Since the pushed-in portion or spiral winding of No. 31) is exposed, there is a drawback that unevenness occurs on the surface to be polished.

Furthermore, during polishing work, the adhesion between the drum (30) and the belt sander (31) becomes loose, resulting in damage and scattering of the belt sander (31), which is not only uneconomical but also may damage the material to be polished. Ta.

Furthermore, there was a drawback that replacing the belt sander (31) required skill and effort.

[Means for solving problems]

The present invention solves the above-mentioned problems.The belt sander is configured in advance into a cylindrical shape (endless) with a predetermined diameter, and the drum is expanded and contracted inside the belt sander, thereby making it possible to attach and replace the belt sander and the drum. It is designed so that it can be easily carried out.

That is, in the present invention, an outer piece having an inner surface expanding outward and having a dovetail groove is fixed to each of both ends of a divided outer cylinder which is divided into expandable and contractible parts, and each outer piece has a dovetail groove. Wedge-shaped inner slide pieces are adapted to each dovetail groove, and a slide block having female screw holes opposite to each other is provided in the center of each of the wedge-shaped inner slide pieces at both ends of the slide block. The female threaded hole is configured to be screwed with a rotating shaft having male threaded portions on both ends thereof which are threaded into the female threaded hole.

[For production]

The expansion/contraction drum of the present invention literally has the function of expansion and contraction.

Of course, "expansion" is relative, and means expansion after contraction, or more precisely, return to its original state.

The same applies to the case of using a rubber roll, but in the case of using a drum sander below, in the present invention, the belt sander (20) is formed in advance into a cylindrical (endless) shape with a predetermined diameter.
organized and prepared.

Also, the expansion and contraction drums of the present invention are prepared with substantially the same diameter.

First, the expansion and contraction drum is reduced to a size that fits inside the belt sander (20).

That is, in the state shown in the drawing of fang 1, the rotating shaft (14) is rotated by the handle (21) while holding down the outer cylinder (1).
When the is rotated in the retraction direction, the slide having wedge-shaped slide pieces (6) and (7) is rotated by the action of the male screw parts (16) and (17) provided at both ends of the rotating shaft (14). Blocks (11) and (12) are each equally moved outward as shown in the illustration.

As a result, (because the matching parts (8) of the wedge-shaped slide pieces (6) and (7) are adapted to the dovetail grooves (3) of the outer pieces (4) and (5), respectively, (4)
and (5) are respectively inside, that is, the rotating shaft (
14) direction, and at the same time the divided outer cylinder (1α) (
1'') (IC) & (ld) are also moved inward, that is, in the direction of the rotating shaft (14), and their outer diameters are reduced.

In addition, in the above shrinking process, one of the opposing split outer cylinders (la
) (lb) to the rotating shaft (14) side a little early, and then moving the divided outer cylinder (1') (1'') to the rotating shaft (14) side, the divided outer cylinder (J ( L) (1
b) It is possible to eliminate the mutually pressing force generated between CIC> (ld).

Next, a cylindrical belt sander (2o) having a predetermined diameter is fitted around the outer periphery of the reduced drum, and the drum is expanded (restored to its original state).

This drum expansion can be achieved by rotating the rotary shaft (14) in the opposite direction to the above-mentioned contraction, and as a result, the outer pieces (4) and (5) and the divided outer cylinders (la) (Ib
) (1") and (ltt) are separated from the rotating shaft (14), and the spear 1 is finally restored to its original state as shown in the figure. A belt sander (20) is attached to the outer circumference of the outer cylinder (1), and the drum The sander is completed. In this state, the flanges (18) fit into both ends of the outer cylinder (11), and act to prevent abrasive materials, cutting powder, etc. from entering the inside of the drum.

Thereafter, the slide blocks (11) and (12) can be returned to their original position by screwing a nut or the like onto the rotary shaft (14) to stop the slide blocks (11) and (12) for 1 m, and then used as a drum sander.

Incidentally, the belt sander (20) can be easily replaced in accordance with the above-mentioned reduction or enlargement.

In addition, when using a rubber roll for conveyance, etc., prepare a cylindrical (endless) rubber body of a predetermined diameter instead of the belt sander (20) and perform the same procedure as above, and one cylindrical rubber body is worn out. In case of damage, only the cylindrical rubber body can be easily replaced.

〔Example〕

The drawings show one embodiment of the present invention, and details thereof will be explained below.

In the figure, (1) is an outer cylinder, which is configured so that it can be reduced from a completely cylindrical state.

That is, the spear 3 is divided into four parts as shown in the figure, and one opposing divided outer cylinder (IC) (Ib) is configured to be movable inside the other opposing divided outer cylinder (IC) (1'').

Specifically, it is divided so that the inner circumferential length (NI) of one opposing divided outer cylinder (lC) (1') is longer than the outer circumferential length (Gz).

As a result, one of the opposing split outer cylinders (lC) (1b
) can be moved inward regardless of the other division (lC) (ld), and furthermore, the other division outer cylinder (IC)
C1d) can also be moved inward and reduced in size as a whole.

Also, from the above-mentioned contracted state, next the above-mentioned other divided outer cylinder (
IC) (ld) is moved outward, and one of the divided outer cylinders (1α) (Ib) is moved outward to expand (more precisely, return to its original state) and become a complete cylinder. It is possible.

Next, the above divided outer cylinder (lC) (Ih) (1”)
Inside each of both ends of the spear 2, the inner surface (2) expands outward and an outer piece (4) (51) having a dovetail groove (3) is fixed on the inner surface. Ru.

Figure 4 shows the left end view (A) and front view C of the outer piece (4).
The right end view (c) is shown. Outer piece (5)
are also substantially the same and are provided in a direction symmetrical to the outer piece (4). .

Next, in the dovetail grooves (3) of the outer pieces (4) and (5), a wedge-shaped inner sliding piece (61 (7)) is fitted with a matching part (8).
) are adapted respectively.

Figure 5 shows the left end view (A) of the inner slide piece (6),
A front view (b) and a right end view (c) are shown.

The inner slide piece (7) is also substantially similar and is provided in a direction symmetrical to the inner slide piece (6).

Figure 6 shows a left end view (A), a front view (B), and a right end view (C) showing the compatible state of the outer piece (4) and the inner slide piece (6).

This is substantially the same for the outer piece (5) and the inner slide piece (7), and the outer piece (4) and the inner slide piece (6) are symmetrical in direction.

Next, add the wedge-shaped slide pieces (6) and (7) on both ends.
) are opposite female screw holes (9) and (N
o) sliding blocks (11) and (12) are provided.

A wedge-shaped slide piece (6) and a slide block (11) are shown in Figure 7 of the spear and Figure 8 of the fang.

The above structure is substantially the same for the wedge-shaped slide piece (7) and the slide block (12), and the wedge-shaped slide piece (6) and slide block (11) are symmetrical. .

In the figure, (13) is a positioning key for the slide blocks (11) (12), which is matched with the fixed shaft (15) of the slide blocks (11) (12) provided on the outer periphery of the rotating shaft (14), which will be described later. ing.

Next, the female threaded holes (9) and (lO) of the slide blocks (11) and (12) are provided with male threaded parts (16) and (lO) at both ends that fit into the female threaded holes (9) and (lO), respectively. A rotary shaft (14) provided with a rotary shaft (17) is screwed together.

In the figure, (18) is a flange that fits into both ends of the drum when it is expanded, that is, when it is in a fully cylindrical state, closing both ends and acting to prevent polishing powder, cutting powder, etc. from entering the inside of the drum. It is attached to the wedge-shaped slide piece (61 (7)) with a bolt (19).

When the drum is retracted, the flanges (18) move outward together with the wedge-shaped slide pieces (6) and (7), respectively, and the divided outer cylinders (1C) (1") (IC) and (ld)
It is provided in advance so that it does not get in the way of the inward contraction movement.

In addition, (20) in the figure is a belt sander, and (21) is a handle for rotating the rotating shaft (14).
22) is a flange provided at the center of the fixed shaft (15), and the positioning bracket (23) pre-installed at the center of the outside of the above division fm (C) (IA) (1') El Hi (ld) (f) ) is adapted between.

Then, the divided outer cylinder (1α) (lb) (IC) and (1d
) operates while maintaining the same position during expansion and contraction, and the divided outer cylinders (1α) (lb) (IC) and (ld)
This prevents uneven expansion and contraction of the image. Furthermore, in order to smoothly retract the divided outer cylinders (lα) (175) (IC) and (1d), one of the opposing divided outer cylinders (lα) (IA) rotates as soon as possible when retracting. Move to the side.

It is desirable that the other opposing split outer cylinder (1') (Id) be configured to subsequently move toward the rotating shaft.

For this purpose, the divided outer cylinder (1α) (Ib) and the divided outer cylinder (
IC) (ld) each outer piece (41
(51 and the inner slide frame (61 (71) may be adjusted in a compatible relationship.

That is, the divided outer cylinder (l
α) (mA) The outer expansion angle of the outer piece (41 (5) inner surface (2) (the angle of the dovetail groove (3) of the outer piece (41 (51) and the inner slide piece (6) ( The angle of the fitting part (8) in 7) is set to 16 degrees, for example, and the divided outer cylinder (1?) (ld) is set to 16 degrees for example.
Outer piece (4) (s) The outward expansion angle of the inner surface (2) (Dovetail groove (3) of outer piece (4) (5)
angle and the compatible part (8) of the inner slide piece (61 (7))
Similarly, the angle ) may be set to 15 degrees, for example.

As a result, when the drum is reduced, that is, the divided outer cylinder (1α)
(xA) (xc) When the rotating shaft (14) is rotated with the handle (21) with the (ld) stopped, the divided outer cylinder (1α) (IA) with the large angle mentioned above moves inward quickly. Then, the divided outer cylinder (1') (1'') with the smaller angle moves inward, and the divided outer cylinder (1α) moves inward.
) (1b) and the divided outer cylinder (IC) (ld) can eliminate the mutually pressing force generated between them.

〔Effect of the invention〕

According to the present invention, unevenness does not occur on the surface to be polished,
Furthermore, it is possible to provide a drum sander that does not cause the belt sander to come loose, break, or fly off during sanding work, is economical, and has the effect that it is extremely easy to install and replace the belt sander. be.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Figure 1 is a vertical sectional view of the main part, Figure 2 is a longitudinal sectional view of the main part showing a reduced state, Figure 3 is a longitudinal sectional view of the drum, and Figure 4 is a longitudinal sectional view of the main part. Figures (a), (b), e→ show the outer frame, (a) is a left end view, (b) is a front view, (c)
is a right end view, fang 5 (a), (b), and (c) show the inner slide piece, (a) is a left end view, (b) is a front view, e→
is a right end view, fang 6 diagrams (a), (b), and (c) show the compatible state of the outer piece and the inner slide piece, (a) is a left end view,
(B) is a front view, (C) is a right end view, Figure 7 is a side view of the inner slide piece and slide block, Figure 8 is a sectional view taken along the line X-X of Figure 7 with the 7 flange section added, FIG. 9 is a perspective view showing a conventional example, and FIG. 10 is a perspective view showing another conventional example. (11...outer cylinder, (1α) (Jb) (1?) (l
d)...Divided outer cylinder, (2...inner surface, (3)...
Dovetail groove, (4) (5)...outer piece. (6) (7)... Wedge-shaped inner slide piece, (
9) (10)... Female screw hole, (11) (12)
...Slide block, (14) ...Rotating shaft,
(16) (17)...Male thread part.

Claims (1)

[Claims] Inside each end of the divided outer cylinder which is divided into expandable and contractible parts, an outer piece whose inner surface expands outward and has a dovetail groove is fixed to the inner side, and a wedge is attached to the dovetail groove of each outer piece. The wedge-shaped inner slide pieces at both ends are each fitted with a slide block having female threaded holes opposite to each other in the center, and the female threaded holes of the slide block are provided at the center of the wedge-shaped inner slide pieces at both ends. A cylindrical expandable and retractable drum for abrasive materials, etc., characterized in that a rotary shaft having a male threaded portion that is threaded into the female threaded hole is screwed into each of the rotating shafts.