JPH0232374Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention has a tread pad that presses against the inner peripheral surface of an endless sanding belt that circulates in the same direction as the material feeding direction, and runs on the material feeding path. wood, metal,
The present invention relates to a wide belt sander that grinds and polishes the surface of a workpiece such as a resin by pressing the abrasive grain surface of the sanding belt against the surface of the workpiece.

<Prior art> Conventionally, when the abrasive grain surface of the sanding belt is pressed against the workpiece by pressing the tread pad placed on the inner peripheral surface of the sanding belt, the abrasive grain surface of the sanding belt is pressed against the workpiece a as shown in FIG. Sanding belt b is blocked, but in a position where workpiece a does not exist, sanding belt b is below the surface position of workpiece a, so both left and right ends c of workpiece a are exposed to the inclined oversun. Deterioration (hereinafter simply referred to as kuare) will occur, and products with severe deterioration will become defective if they reduce the product value.
In furniture, building boards, etc. in which the veneer is bonded to the base plate with adhesive or the base plate is painted decoratively, the veneer or paint layer at both left and right ends may be excessively scraped off, resulting in a cracked state. In many cases, the base plate is exposed, resulting in loss of product value and a defective product.As a countermeasure to prevent such damage, the present applicant has previously proposed Utility Model Publication No. 46-25496.
At both left and right ends of the elastic material plate provided in the tread pressure pad, approximately V-shaped notches when viewed from above are provided with pressure relief parts consisting of V-shaped protrusions, etc. This was prevented by reducing the pressure on the foot.

<Problems to be solved by the invention> However, as in the past, the lengths of the notches or protrusions provided on both the left and right ends were changed each time the width of the workpiece changed, which significantly reduced work efficiency. .

The purpose of the present invention is to improve the tread pad of the wide belt sander mentioned above, and it has a simple structure so that even if the width of the workpiece changes, the tread force of the tread pad can be adjusted according to the width of the workpiece. This is a tread pad that can be operated and adjusted.

<Means for Solving the Problems> In order to achieve the above object, the tread pad in the present invention is a flat plate having an inclined surface at the tip and a storage groove for an elastic material plate in the longitudinal direction of the center of the lower part. The upper surface of the pressing blocking piece is in contact with the pad frame of the treading pad and the lower surface of the pressing holder which is engaged with the pressing member disposed in the device groove, and the lower surface is hooked at both ends to the front and rear engaging flanges. By pushing and pulling the pressure blocking piece from the end of the tread pad, the pressure blocking piece moves from side to side using the upper surface of the engagement flange as a guide to block the pressing force of the pressing member,
This is characterized in that the width of the tread pressure on the tread pad is changed.

<Function> By pushing the pressure blocking piece from the end of the tread pad, using the upper surface of the engagement flange as a guide, the pressure blocking piece is inserted while pushing up the pressure holding body, and the tip of the pressure blocking piece prevents the workpiece from traveling. When pushed to the side end position, the second
As shown in the figure, the pressing action of the pressing member is blocked by the pressing blocking piece, and the treading force on the sanding belt does not work. I will have to work. Therefore, the sanding belt where the press blocking piece is not located is pressed against the surface of the workpiece, and the sanding belt where the press blocking piece is inserted is located above the surface of the workpiece. Its upper position is a state in which it escapes upward in an inclined manner following the inclined surface of the tip of the press-blocking piece starting from a position away from the side edge of the workpiece, so there is no crack at the side edge of the workpiece. Does not occur.

In addition, the elastic material plate in the portion where the pressing action of the air bag is not exerted by the pressure blocking piece escapes into the storage groove of the pressure blocking piece and stores the upper part, thereby further improving the escape action of the elastic material plate.

<Example> An example of the present invention will be described with reference to the accompanying drawings.

FIG. 3 shows an example of a wide belt sander to which the present invention is applied, in which 1 is a main body frame, 2 is a material feeding guide table that is raised and lowered by a lifting screw 4 as the lifting handle 3 is rotated; A driven roll 5 is disposed at the front, drive rolls 6 are mounted on the shaft at the rear, and an endless material conveying belt 7 is wrapped around these. A sanding frame 8 is provided on the upper part of the frame 1 in correspondence with the material feeding guide table 2. A driving roll 9 that crosses the material feeding direction is mounted on the lower front part of the sanding frame 8, and a driven roll 10 is attached to the rear part of the sanding frame 8. is mounted on a shaft, and a tension roll 11 that can move up and down is mounted on the top.
An endless sanding belt 12 is wrapped around a drive guide mechanism consisting of the drive roll 9, driven roll 10, and tension roll 11.

Reference numeral 13 denotes a mounting portion for a tread pressure pad 14 facing the inner peripheral surface of the sanding belt 12 between the drive roll 9 and the driven roll 10, and the tread pressure pad 14 is inserted into the mounting portion from the side. , the tread pressure pad 14 has a device groove 16 with an open bottom surface formed in the pad frame 15, an engagement collar 17 corresponding to the front and back at the lower end of the inner wall surface of the device groove, and a rectangular cross-sectional area provided in the upper part of the device groove 16. A pressing member consisting of an air bag 18 is housed, and a pressurized air supply pipe 19 is connected to the side thereof. A plurality of pins 20 are provided on the lower surface of the air bag 18 in parallel in the material feeding direction.
A press holding body for the air bag 18 is provided, the upper and lower sides of which are sandwiched between thin spring plates 21, 21, the upper surface of the press holding body is brought into contact with the lower surface of the air bag 18, and the lower surface is attached to the front and rear engaging flanges 17, 17. Sponge, rubber, etc., which are arranged in a manner that extends over the pad frame 15, and whose upper surface is in contact with the lower surface of the press holding body and whose lower surface is protruded from the pad frame 15.
An elastic material plate 22 such as felt is applied, the lower surface of the elastic material plate 22 is covered with a wear-resistant and flexible covering plate 23 such as canvas, and the covering plate 23 is hung on each lower surface of the front and rear engaging collars 17. and secure with bolts 24.
Then, an inclined surface 25 is formed at the tip shown in FIG.
Storage groove 26 for the elastic material plate 22 in the longitudinal direction of the lower center
The flat plate-shaped pressure blocking piece 27 provided with the engaging flange 1
Spring plates 21 and 21 are provided so as to be able to be pushed and pulled freely by extending between the spring plates 7 and 17, and the pin 20 is sandwiched between the spring plates 21 and 21 by pushing the spring plates 21 and 21 between them.
The press-blocking piece 27 moves using the upper surfaces of the engaging flanges 17, 17 as guides while pushing up the press-holding body with its entire surface in sliding contact. Further, the air bag 18 can be pressed and held by only the thin spring plate 21 without the pin 20.

In the above description, instead of the air bag 18, another pressing member such as a coil spring may be used.

Then, depending on the width of the workpiece 28, the pressing prevention piece 27
While pushing up the spring plates 21, 21 that sandwich the pin 20, push the tip 25 along the upper surface of the engaging collar 17 from the left and right or from one side, respectively, to the running side end position of the workpiece 28. In the inserted position, the pressing action of the air bag 18 is blocked by the pressing blocking piece 27, and the treading force of the sanding belt does not work, and the air bag 1
The pressing force No. 8 is applied only to the position where the pressing blocking piece 27 does not exist. That is, as shown in FIG.
The part of the sanding belt 12 that is in pressure contact with the machined surface of the workpiece 28, and the part of the sanding belt 12 into which the pressure blocking piece 27 is inserted is not pressed, so it is located above the machined surface of the workpiece 28. , the sanding belt 1 at both left and right ends of the workpiece 28
In state 2, the material escapes upward in an inclined manner starting from a position away from the side edge of the workpiece, preventing the left and right ends of the workpiece from being bent, and finishing the surface flat.

Further, the upper surface of the elastic material plate 22 in the portion where the pressing action of the air bag 18 is not exerted by the pressing prevention piece 27 escapes into the storage groove 26 of the pressing prevention piece 27 and stores the upper part, so that the upper surface of the elastic material plate 22 is It also creates an escape action, further improving the escape action.
Furthermore, the press blocking piece 27 is made of a single flat plate, and its operation is simple, simply by sliding the upper surface of the engaging flange to push up the press holding body, and by simple operation and adjustment. The tread pad itself is also exactly the same as before, preventing it from becoming larger. Since the pressure of the pressing member is received by the entire surface of the pressing blocking piece, the holding of the pressing member is not limited to a pin that does not bend, but may also be a soft material such as a spring plate or a rubber plate, or a material that is flexible. ,
It becomes a press holding body that can be used over a wide range of areas.

In this embodiment, the pressure blocking pieces 27 may be provided on both the left and right sides to change the width of the pressing force, or may be provided only at one end.

<Effects of the invention> As clarified in the above explanation, the present invention has a flat pressing prevention piece that has an inclined surface at its tip and a storage groove for an elastic material plate in the longitudinal direction of the center of the lower part. The pad frame of the treading pad contacts the lower surface of the pressing holder which engages the pressing member disposed in the device groove, and the lower surface is provided with both ends spanning the front and rear engaging flanges to prevent pressing. By pushing and pulling the piece from the end of the treading pad, the pressing blocking piece moves from side to side using the upper surface of the engaging flange as a guide to block the pressing force of the pressing member,
Since the width of the pressure on the pressure pad is changed, even if the width of the workpiece changes, the width of pressure corresponding to the width of the workpiece can be adjusted by simply pushing and pulling the pressure blocking piece with a simple configuration and operational adjustment. This improves work efficiency, eliminates the gap at the side edge of the workpiece, and significantly improves the product value, and also allows the upper part of the elastic material plate to escape when blocking pressure by using the storage groove of the pressure blocking piece. This further improves pressure prevention. Further, since the press holding body is received by the entire surface of the press blocking piece, a wide range of materials can be used for the press holding body, such as soft materials and materials that are susceptible to bending.

[Brief explanation of drawings]

Figures 1 to 4 of the accompanying drawings show one embodiment of the present invention, and Figure 1 is an enlarged vertical cross-sectional side view of the tread pad showing the main parts, Figure 2 is a similar vertical cross-sectional front view, and Figure 3 is a similar vertical cross-sectional front view. A schematic side view of the wide belt sander, FIG. 4 is an enlarged perspective view of a pressure blocking piece, and FIG. 5 is an explanatory view showing grinding and polishing using a conventional tread pad. 7... Material feeding belt, 12... Sanding belt, 14... Pressure pad, 15... Pad frame, 1
6... Device groove, 17... Engaging collar, 18... Air bag, 22... Elastic material plate, 22... Covering plate, 25
... Sloped surface, 27 ... Pressure blocking piece.

Claims (1)

[Claims for Utility Model Registration] A sanding frame that is compatible with a material feeding device in which an endless material feeding belt is wrapped around a driving roll and a driven roll, and rolls are mounted at the front and rear sides of the sanding frame, respectively, across the material feeding direction. Tension rolls are provided at a distance from each other, and an endless sanding belt is freely runnable around these rolls. A sanding device is provided in which a tread pressure pad that is detachable in the left and right direction is fitted to tread on the inner circumferential surface of the sanding belt and tread on the outer circumferential surface of the sanding belt toward the material feeding device, and the tread pressure is The pad has a device groove with an open bottom surface formed in the pad frame, an engagement collar corresponding to the front and back at the lower end of the inner wall surface of the device groove, and a pressing member such as an air bag or a coil spring placed above the device groove. Further, a press holding body made of a spring plate is provided in the lower part of the press holding member, the upper surface of which is in contact with the lower surface of the pressing member. The tread pad is equipped with an elastic material plate made of sponge, rubber, felt, etc. that contacts the lower surface of the pressure holder and whose lower surface protrudes from the pad frame, and the elastic material plate is covered with an abrasion-resistant flexible covering plate. In a wide belt sander machine, a flat pressure blocking piece is provided with an inclined surface at its tip and a storage groove for an elastic material plate in the longitudinal direction of the center of the lower part. The pressing action member disposed inside contacts the lower surface of the engaged pressing holding body, and the lower surface is provided so that both ends are wrapped around the front and rear engaging flanges, and the pressing blocking piece is pushed and pulled from the end of the tread pad. As a result, the pressure blocking piece moves from side to side using the upper surface of the engaging flange as a guide to block the pressing force of the pressing member,
A treading pad for a wide belt sander machine, characterized in that the treading width of the treading pad is changed.