JPS608921Y2 - Air cushion device for wide belt sander - Google Patents

Description

[Detailed description of the invention] This invention relates to the air cushion treading device of the wide belt sungu, which includes an air bag loaded into a planar recess formed in the treading frame and having an open surface corresponding to the inner surface of the sanding belt; An improved inclusion intervenes between the bed plates such as a sponge plate or a felt plate protruding from the planar recess to hold the elastic acting surface of the air bag in a flat plate shape, thereby maintaining the treading effect of the sanding belt. When grinding a narrow workpiece or a workpiece with an uneven surface in the center of the belt width of a sanding belt, tensile force acts on the inclusions on both sides in the width direction. The finish of grinding and polishing will not be poor, and there will be no defects that require trouble to re-parallel when the parallelism is disturbed, such as when parallel rods or narrow plates are used. This is what I did.

Wide Belt Sangoo's air cushion treading device has an air bag that maintains the required internal pressure in a box-like recess with the same shape as shown in Figure 3, but the air bag partially retains the pressure. When a sanding belt is applied, it has a free deformation force that causes the part to become depressed and other parts to bulge out, and the surface that is not in contact with the planar depression bulges out into a circular shape due to internal pressure. When a treading effect is produced by directly corresponding to the inner surface, the contact becomes horizontally linear or free deformation reduces the treading effect and reduces the grinding and polishing efficiency.

For this reason, it is appropriate to use an intervening member between the air bladder and the inner surface of the belt to create a planar cushioning effect of the air bladder.

The inventor of this invention is the Special Publication No. 768-768, Publication No. 46-2 of the Actual Publication.
As shown in Publication No. 8157, a large number of rods or narrow plates are arranged in parallel in the width direction so that each can move freely up and down and tilt in the front and back direction, and the whole body can move in the width direction. We proposed an inclusion that deforms into a wave shape and adapts to the distortion, warpage, and unevenness of the workpiece surface.

Since the individual rods or narrow plates are independent, it is very advantageous in terms of air cushioning, but since it is in direct contact with the inner surface of the belt, it wears out quickly, so layer-resistant flexible plates such as woven fabric are not suitable. Or, when a bed board made of a sponge board or the like is removed from the treadle frame and replaced, or when pressurized air is removed from the air bag for inspection etc., the parallel arrangement is often disturbed and overlapping occurs. Rearranging this is very time consuming and disadvantageous in handling.

In order to eliminate this drawback, as shown in Japanese Utility Model Publication No. 48-39038, we proposed the use of a chain body in which a large number of particles can be chained and stretched into a flat plate using a large number of shaft rods parallel to the running direction of the belt. .

This chain is extremely advantageous in terms of handling, but as shown in Figure 1, it is possible to feed a small mountain of workpiece e into the center of the belt width of sanding belt a, or to transport a workpiece with a convex surface in the center of the belt width. When feeding, the chain body tries to adapt to the workpiece by curving the part corresponding to the contact surface of the workpiece e into a raised waveform, but the pressure of the air bag C is also applied to both sides in the width direction. Since the force is applied evenly and prevents the bending, a tensile force acts on the chain as shown by the arrow.

For this reason, the abrasive grain surface of the sanding belt a comes into strong contact with the shoulders d and d on both sides of the workpiece e, creating a treading pressure that makes the contact pressure with the flat surface between the shoulders d and d uneven, so that grinding and polishing is not performed. It cannot be made even, and the shoulders d and d are polished, resulting in so-called edge droop.

The present invention has a treading effect equivalent to that of parallel bars and narrow plates, and in terms of handling, it is equivalent to a chain body that maintains a parallel arrangement, that is, the functions and effects of only the advantageous parts of the two types of inclusions. The purpose is to provide inclusions having the following properties.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 shows an example of a wide belt sander, in which a sanding frame 2 correspondingly provided on a lifting table 1 is provided with a steering roller 3 that can rise and fall and horizontally swing.
A drive roller 4 and a guide roller 5 are installed at the front and rear of the lifting table 1.
are provided, and an endless sanding belt 6 is wrapped around the rollers 3 to 5 as a driving mechanism.

The sanding frame 2 is provided with a treading frame 7 which is inserted and fixed in a drawer shape from the side between the rollers 4 and 5.
As shown in an enlarged view in FIG. 3, the lower surface of the frame 7 is open, and a planar recess 8 from which jaws 9, 9 are projected in a corresponding manner is formed on the front and rear sides of the open surface. An air bag 10 with a rectangular cross section is loaded, and a pressurized air supply pipe 11 is protruded to the outside.

A flat band-shaped body 12 which is free to bend in a wave-like manner in the width direction of the planar recess 8 is applied to the lower surface of the air bag 10.

As shown in FIG. 5, the band-like body 12 is made of a material such as a synthetic resin or a spring material that can be freely curved, and has a large number of U-shaped elements projecting from the base 13a with the leg parts 13b, 13b extending approximately parallel to each other. body 1
3 (FIG. 6), each U-shaped element body 13 is faced in a staggered manner, and the leg part 13-1b of the U-shaped element body 13-1,
Within the interval of 13-tb, left and right U-shaped elements facing each other 13-
2-13-3's foot lever parts 13-2b-13-3b are inserted at regular intervals and are connected in a parallel manner, and a flexible and elastic material such as a sponge or a thin rubber plate is inserted from the upper surface. The body 14 is adhered, an elastic sheet 15 such as a rubber plate is further adhered from the bottom surface, and the U-shaped element body 13 is sandwiched between the elastic body 14 and the elastic sheet 15 to be integrated.

A bed board 17 made of a thick sponge board, felt board, etc. is placed on the lower surface of the band-shaped body 12 and protrudes downward from between the jaws 9, 9, and is fixed to the front and rear outside of the treading frame 7 with screws 19, 19. The lower surface of the bed board 17 is placed against the inner surface of a layer-resistant flexible board 18 made of woven fabric or the like that closes the lower part of the opening surface.

The lower surface of the strip 12 is normally held flat by the U-shaped element 13, and when the workpiece 20 causes a bend in the width direction, the base 13a of the U-shaped element 13 on the bent portion bends to the left and right. Since it curves in the left-right direction independently of the U-shaped element 13, and the surrounding elastic body 14 and elastic sheet 15 bend, each U-shaped element 13 responds to the bending without causing any tension.

Further, when the workpiece 20 bends in the front-rear direction, the leg portion 13b of each U-shaped element 13 curves and slides on the upper surface of the workpiece 20.

FIG. 8 shows a cut from the front edge of the U-shaped element 13 that contacts the elastic body 14 or the elastic sheet 15 to the inside corresponding to the adjacent gap X between the adjacent U-shaped elements 13-1 and 13-4. 16
a, and the U-shaped element body 13-. .

U-shaped element body 13-2.13 facing and adjacent to 13-1
The notches 16b extending from the rear end edge to the inside are provided alternately in correspondence with the adjacent gaps y of -3, and when the band-shaped body 2 is bent in the width direction by the processed material 20, the bending The flexibility of the U-shaped element body 13 is improved by absorbing the local tensile force in the width direction caused by the bending of the part by expanding the notch 16 and preventing the tensile force from being applied in the width direction. It was a target.

The present invention has the configuration as exemplified above, in which a large number of parallel U-shaped elements 13 are bonded and sandwiched between an elastic body 14 and an elastic sheet 15, and a band-like body 12 is integrated into an air bag 1.
0 and the bed plate 17, it forms a single flexible plate, and the arrangement of the U-shaped elements 13 is not disturbed by the work of replacing the layer-resistant flexible plate 18 or the bed board 17. Also, as shown in an exaggerated manner in FIG. 3, the workpiece 20 fed onto the lifting table 1 has an uneven surface or a small protrusion, so that the width of the layer-resistant flexible plate 17 and the bed plate 16 is reduced. When a bend in the direction occurs, U
Since the shape elements 13 are arranged independently and staggered with a certain gap, the U-shaped elements 13 are curved without being pulled against each other, and the elastic body 14 and the elastic sheet 15
Since the band 12 is visible, the band 12 bends to follow the uneven curved surface and both ends of the processed material 20, bending the contact surface of the air bag 10, and bending the air cushion elasticity of the air bag 10 to the backing plate 16. It has an initial force that can be transmitted to the sanding belt 6 through the sanding belt 6 to prevent edge sag and eliminate the drawbacks of conventional inclusions.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the drawbacks when using a chain element as an inclusion,
Figure 2 is a schematic side view of the Wide Belt Sangoo, Figure 3 is an enlarged front view of the main parts taken longitudinally, Figure 4 is a vertical cross-sectional side view taken along line A-A in Figure 3, and Figure 5 is Figure 3. B-B line longitudinal side view, No. 6
The figure is a partially cutaway plan view of the strip body 12, and FIG. 7 is a U-shaped element body 1.
3 is a perspective view, and FIG. 8 is a plan view showing a cut 16 in the elastic body 14 (elastic sheet 15). 2・・・Sanding frame, 6・◆・・・・
Endless sanding belt, 7...Treading frame, 8...Planar recess, 9...Jaw, 10.
... Air bag, 12 ... Band-shaped body, 13 ...
... U-shaped element body, 14 ... Elastic body, 15 ...
...Elastic sheet, 16a, 16b...Notch, 17...Bed plate, 18...Layer-resistant flexible plate, X, y... - Adjacent gap.

Claims (1)

[Claims for Utility Model Registration] 1. An air bag 10 with freely adjustable internal pressure is loaded into a planar recess 8 formed in a treading frame 7 facing the running inner surface of an endless sanding belt 6, and the air bag 10 is inserted from the base 13a to the foot lever part. 1
A large number of freely curved U-shaped elements 13 with protruding 3b and 13b
The foot rod portions 13-1b,
Within the interval of 13-1b, the left and right U-shaped elements I facing each other
The leg parts 13-2b and 13-3b of L2゜13-3 are inserted with a certain gap between them and are connected in parallel, and an elastic body 14 is bonded from the top surface, and an elastic sheet 15 is bonded from the bottom surface. The band-shaped body 12 held by the above-mentioned air bag 10 is applied to the lower surface of the air bag 10, and the band-shaped body 12 is adapted to be able to be held in the jaws 9.9 provided before and after the open surface of the planar recess 8, and the band-shaped body This air cushion treading device for a wide belt sangu machine is made by applying a bed board 17 such as a sponge board to a body 12, and contacting the bed board 17 with the inner surface of a layer-resistant flexible board 18 fixed to a tread frame 7. 2 Each adjacent U-shaped element 1 of the U-shaped element 13 that contacts the elastic body 14 and/or the elastic sheet 15
3-t* A notch 16a extending from the front edge to the inside corresponding to the adjacent gap X of 13-4, and the U-shaped element body 13-,
Adjacent U-shaped element bodies 13-2, 1 facing 13-,
The wide belt sangu machine according to claim 1 of the utility model registration claim, characterized in that cuts 16b extending from the rear edge to the inside are provided alternately corresponding to the adjacent gaps y of 3-3. air cushion device.