JPH02116462A - Belt sander - Google Patents

Abstract

PURPOSE:To remove the polishing unevenness of the working stock surface and to grind uniformly and beautifully by reciprocating a pad frame in the orthogonal direction with the working stock traveling direction and press-fitting an endless sanding belt to the working stock with conditioning it by a stepping pad. CONSTITUTION:A feed stock device 2 is composed by bridging a feed stock belt on fore and aft rolls, driven by a feed stock motor, an endless sanding belt 41 is bridged on the belt guide mechanism consisting of rollers 14, 15, 30 and the abrasive grain face is press-fitted to the work stock by a stepping pad 23 fitted to a pad frame 11. The pad frame 11 is reciprocated by being guided by a sliding piece 2 via sprockets 37, 38, an eccentric pin 39 and a crank 40, the endless sanding belt 41 is press-fitted to the work stock with being conditioned by a stepping face 20a and the polishing unevenness of the work stock is prevented. When the stepping pad 23 and a wear resistant coating belt 22 are formed by a vent material, an air injection path 50 is formed inside a pad support piece 24 and a pressure air is injected from the stepping face 20a, the endless sanding belt 41 is conditioned and becomes smoother.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a belt sander machine for grinding and polishing the surface of wood.

<Prior art> An endless sanding belt is wrapped around a belt guide mechanism including front and rear guide rollers supported on the material feeding path side, and a grinding device is provided with a tread pad device inside the endless sanding belt. Belt sanders arranged opposite a material device are known.

<Problem to be solved by the invention> In the configuration of the conventional grinding device, as shown in Fig. 7,
Looking at the tension state of the endless sanding belt C between guide rollers a and b, the endless sanding belt C is wide;
In addition, since the distance between the lower edges of the guide rollers a and b is long, the tensile force is unevenly distributed in the width direction of the guide rollers a and b, which usually causes ripples X in the width direction. Moreover, this ripple X is the treading pad d
Since it is an elastic body, it will come into pressure contact with the workpiece as it is without being corrected.

As a result, the surface of the processed material is not pressed evenly,
Vertical streak-like polishing unevenness occurs. This unevenness becomes noticeable in the case of final polishing such as paint polishing, and becomes a cause of deterioration of the finishing quality.

As a means to solve this problem,
As disclosed in No. 33956 and JP-A-56-119363, the running direction of the endless sanding belt is
There is a method in which polishing unevenness is removed by tilting the workpiece with respect to the running direction of the workpiece and imparting a polishing direction component in a direction (left and right direction) perpendicular to the feed direction to the workpiece.

However, this method has the disadvantage that the sanding belt needs to be widened and the sanding device also becomes larger.

An object of the present invention is to provide a belt sander that can prevent uneven polishing without the above-mentioned drawbacks.

<Means for Solving the Problems> The first invention of the present application includes a grinding device in which a pressure pad device is provided inside the grinding region of an endless sanding belt that circulates through a belt guide mechanism, and a material feeding device. In the belt sander machines arranged opposite to each other, the tread pad device is supported on the main body frame side via a left-right guide member, and the tread pad device is moved orthogonally to the material feeding direction by a left-right reciprocating device. It is characterized by continuous reciprocating movement in the direction.

A second invention is characterized in that, in the first invention, air is injected from the tread surface of the tread pad device.

Function> In the first invention, the sanding belt is stretched around the belt guide mechanism, is pressed by the tread pad of the tread pad device, and travels without coming into pressure contact with the workpiece. At this time, the tread pressure pad device continuously reciprocates in a direction (left and right) perpendicular to the material feeding direction. Therefore, even if ripples X occur on the sanding belt between the guide rollers, by the reciprocating movement of the tread pad device, the tread surface smooths it out into a flat surface, eliminates polishing unevenness, and achieves a good polishing film. That will happen.

Further, in the second invention, since pressurized air is injected from the treading surface of the treading pad device, the sanding belt is pressed against the flat surface, and the sanding belt is overlapped with the configuration of the first invention. Can be leveled into a flat surface.

<Example> Embodiments of the present invention will be described with reference to FIGS. 1-4.

Lifting screws 3, 3, which are rotated in conjunction with a motor M, are inserted into the base 1a of the main body frame 1, and the material feeding device 2 is supported by the screws 3, 3 so as to be movable up and down. The material feeding device 2 consists of a material feeding belt 2a stretched between front and rear drive rolls 2b and a driven roll 2C, and the driving roll 2b is connected to a material feeding motor M2 with a continuously variable transmission to run the material feeding belt 2a. I'm letting you do it.

Further, a sanding frame 4 is fixed on the material feeding device 2 to a vertical frame lb connected to the base la of the main body frame l in a gate shape. Various grinding members are attached to the sanding frame 4 to constitute a grinding device 10.

This grinding device 10 will be explained.

On the left and right sides of the sanding frame 4, support plates 4a,
4a hangs down, and drive guide rollers 14 and 15 are mounted on bearings 16.1 on the supply side and discharge side, respectively, on the support plates 4a, 4a.
It is supported by 6. And each guide roller 14,
15 is connected to a drive motor M3 fixed to the main body frame 1 by a belt 17, and a guide roller 14,
The rotational force of the drive motor M3 is applied to 15 (see FIG. 2).

Also, slightly inside the support plates 4a, 4a, a suspension guide shaft 5,
5 is extended in the left-right direction, and the sliding piece 12.12 is provided on the wide upper surface of the pad frame 11 on the suspension guide shaft 5.5.
is fitted to support the pad frame 11 along the suspension guide shaft 5.5 so as to be able to move slightly in the direction (left and right) perpendicular to the material feeding direction.

A fitting part 19 is formed in the pad frame 11, and a tread pressure pad device 20 is fitted into the fitting part 19.

As shown in FIG. 3, the tread pad device 20 has a slippery wear-resistant covering band 22 such as cloth on the bottom surface of the fitting portion 19.
The pad support piece 24 is equipped with a tread pressure pad 23 made of an elastic material such as sponge, rubber, or felt covered with a foam, and the pressure of an air chamber (not shown) disposed in a mounting groove in the pad frame 11 is reduced. By control, the workpiece is pressed against the tread surface 20a.
When it comes directly under the pressure pad, push the bottom surface of the pressure pad downward,
An endless sanding belt 41, which will be described later, is pressed against the upper surface of the workpiece.

A support tube 25 is erected on the upper surface of the pad frame 11, and a left-right insertion rod 28 with both ends fixed to the sanding frame 3 side passes through the support tube 25. It is biased inward by 29.29.

A shaft support tube 26 is supported on the upper part of the sanding frame 4, and a steering frame 31 that rotatably supports the steering roll 30 is rotatable by inserting a central shaft 32 through the shaft support tube 26. Supported. Both shaft ends 30a of the steering roll 30,
30a is supported by a lifting guide plate 3333 via bearings 30b, 30b, and is urged upward by a tension cylinder 34.34 connected to the lifting guide plate 33.33. Further, the steering frame 31 is connected to a steering cylinder (not shown), and swings around a central shaft 32.

And the above-mentioned guide rollers 14, 15. An endless sanding belt 41 is attached to the belt guide mechanism consisting of the steering roll 30.
The abrasive grain surface is brought into pressure contact with the workpiece supplied to the material feeding path by the tread pressure pad 23 at the grinding site.

Furthermore, as shown in FIGS. 2 and 4, a drive morph M, which serves as a reciprocating drive source for the pad frame 11, is mounted on a pedestal lc attached to the outer surface of the vertical frame 1b, and its drive shaft The fixed sprocket 37 is also placed on the stand IC.
It is connected by a chain to a sprocket 38 fixed to the lower side of the.

An eccentric pin 39 is protruded from the sprocket 38, and the other end of a crank 40, which is supported (42) on one side of the wide upper surface of the pad frame 11, is connected to the eccentric pin 39, and the drive motor 36, the crank 40 reciprocates with a stroke twice the eccentricity of the eccentric pin 39,
Along with this, the pad frame 11 is attached to the suspension guide shaft 5,
It reciprocates while being guided in the left-right direction by the action of the 5° sliding pieces 12 and 12 (each of which constitutes a guide member of the present invention).

The tread pressure pad device 20 mounted on the pad frame 11 is driven by the drive motor! 144, it continuously reciprocates left and right with respect to the endless sanding belt 41. With this configuration, the pad frame 11
An example of a left-right reciprocating device is constructed.

In addition, suppression rolls 51a and 51b, which are urged in the suppression direction by a bullet 50, are disposed before and after the grinding device 10 (see FIG. 1).

In this configuration, since the endless sanding belt 41 has a long distance between the lower edges of the guide rollers 14 and 15, the tensile force is unevenly distributed in the width direction, causing ripples X in the width direction. However, in the present invention, the pad frame 11
is driven by a left-right reciprocating device such as a crank 40, and is guided by a suspension guide shaft 5.5 and sliding pieces 12, 12 to continuously reciprocate in the left-right direction perpendicular to the material feeding direction.

In accordance with this, the endless sanding belt 41 is not leveled by the treading surface 20a, but comes into pressure contact with the workpiece,
Grinding and polishing will be performed. As a result, uneven polishing of the processed material is prevented, and a good polished surface can be achieved.

In the above-mentioned embodiment, as shown in FIG. 5, the tread pad 23 attached to the pad support piece 24 and the wear-resistant covering band 22 covering the lower surface thereof are formed of a breathable material, and the pad support piece 24 is made of a breathable material. An air injection path 50 is formed in the air-permeable tread pad 24, and the air-injection path 50 is connected to a compressed air source, and the air injection path 50 is formed in the air-permeable tread pad 24. The air may be dispersed within the tread pad 23 and ejected from the tread surface 20a. In this case, the endless sanding belt 41 is leveled by the air jet action and becomes smoother, which is effective in preventing ripples.

Furthermore, as shown in FIG. 6, the tread pad 55 is integrally formed with a steel material, an air chamber 56 is formed inside the tread surface 20a, and the air is sent through an air injection path 57 formed inside the tread pad 55. The chamber 56 may be communicated with a high-pressure air source, and pressurized air may be ejected from numerous discharge holes 58 formed in the tread surface 20a. In this case, the endless sanding belt 41 is smoothed even further by the pressing action of the rigid body and the blowing action of the air.

<Effects of the Invention> As clarified in the above description, the first invention is such that the pad frame 11 is reciprocated in the left and right direction orthogonal to the traveling direction of the processed material, and the endless sanding belt 41 is moved by the tread pad 23. Since the material is pressed against the workpiece without being leveled, uneven polishing on the surface of the workpiece is removed, and the workpiece can be ground uniformly and beautifully. Further, unlike the conventional configuration in which an endless sanding belt runs at an angle, the belt does not become wider and the apparatus does not become bulkier.

Further, in the second invention, since the pressurized air is injected from the tread surface 20a of the tread pad device 2°, the sanding belt is pushed away in a flat shape, which overlaps with the configuration of the first invention. This prevents the sanding belt from ruffling.

It has excellent effects such as

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a belt sander to which the present invention is applied, and FIG. 2 is a partially cutaway front view of the same. FIG. 3 is an enlarged side view of the grinding device 10, and FIG. 4 is a front view thereof. FIG. 5.6 is a partial side view of the tread pad device 20 that allows air to be ejected from the tread surface 20a, and FIG. 7 is a perspective view of an endless sanding belt showing the problems of the conventional structure. l... Main body frame 3... Sanding frame 5.5... Hanging guide shaft 10... Grinding device 11... Pad frame 12.12... Sliding piece 14.15... Guide Rollers 16, 16...Bearings 20...Treading pad device 20a...Treading surface 26...Guide shaft 23...Treading pad 30...Steering roll 39...Eccentric bin 40... Crank 41...Endless sanding belt 50...Air injection path 51...Ejection end 55...Tread pressure pad 57--Air injection path 56...Air chamber 58--Discharge hole Applicant: Takekawa Iron Works Yoshida Matsuura, Agent, Patent Attorney No. 50, No. 60

Claims (1)

[Scope of Claims] 1) A belt on which an endless sanding belt is stretched, which is constituted by a plurality of rolls including a tread pad device provided on the material feeding path side and guide rollers arranged on both sides of the tread pad device. In a belt sander machine in which a grinding device equipped with a guide mechanism is installed opposite to a material feeding device, a pad frame on which the tread pressure pad device is mounted is supported on the main body frame side via a guide member in the left and right direction. A belt sander characterized in that the pad frame is continuously reciprocated in a direction perpendicular to the material feeding direction by a left-right reciprocating device. 2) Equipped with a treading pad device arranged on the material feeding path side and a belt guide mechanism on which an endless sanding belt is stretched, which is constituted by a plurality of rolls including guide rollers arranged on both sides of the treading pad device. In a belt sander machine in which a grinding device is installed opposite to a material feeding device, a pad frame on which the tread pressure pad device is mounted is supported on the main body frame side via a guide member in the left and right direction, and the pad frame is supported in the left and right directions. A belt sander characterized in that a reciprocating device causes continuous reciprocating motion in a direction perpendicular to the material feeding direction, and air is jetted from a treading surface of a treading pad device.