JPH02262952A - Belt sander - Google Patents

Abstract

PURPOSE:To wipe out cut layers, which are standing between an endless sand belt and a processing material, to the marginal side of the sanding belt so as to prevent unevenness in polishing by arranging the constitution such that a stepping belt steps the inner circumferential face of an endless sanding belt while letting it run in the direction that is crosses the endless sanding belt. CONSTITUTION:A stepping belt 31, which runs unidirectionally in the direction that it crosses an endless sanding belt, is arranged at the pressing face of a stepping pad 27. By making this stepping belt 31 step the inner circumferential face of the endless sanding belt while running in the specified direction, the endless sanding belt is leveled in the running direction, whereby the waving occurring between guide rollers are spread out, and also the cut layers standing between the endless sanding belt and the processing material are wiped out to the marginal side of the sanding belt.

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> A belt guide mechanism consisting of a plurality of cr--rule groups including a tread pad provided on the material feeding path side and guide rollers arranged on both sides of the tread pad, and a belt guide mechanism that is A belt sander machine is known in which a belt grinding device equipped with an endless sanding belt is disposed opposite to a material feeding device.

<Problems to be Solved by the Invention> In the conventional configuration, as shown in FIG. 7, when looking at the tension state of the endless sanding belt C between the guide rollers a and b, the endless sanding belt C is wide 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, since the tread pad is an elastic body, the undulations X are not corrected and are brought into pressure contact with the workpiece as they are.

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 that removes polishing unevenness by tilting with respect to the running direction of the workpiece and giving the workpiece a polishing direction component in a direction (horizontal direction) that intersects with the feed direction.

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 is to arrange a tread belt that runs in one direction in a direction intersecting an endless sanding belt on the pressing surface of a tread pad, and to connect the tread belt to an endless sanding belt. It is characterized in that it comes into pressure contact with the inner circumferential surface of the sanding belt.

Further, in addition to the configuration of the first invention, a second invention provides a structure in which the tread pressure pad and the belt guide mechanism are attached to and integrally connected to a mounting frame, and the mounting frame is moved in a substantially left-right direction. The mounting frame is supported on the main body frame side via a guide member, and the mounting frame is continuously reciprocated in a direction intersecting the material feeding direction by a left-right reciprocating device.

<Function> In the first invention, by pressing the inner peripheral surface of the endless sanding belt while running the tread pressure belt in a direction crossing the endless sanding belt, the endless sanding belt can , leveled in the direction of travel. Therefore, the ripples generated between the guide rollers are pushed out, and the shavings accumulated between the endless sanding belt and the workpiece are swept out toward the edge of the sanding belt.

Moreover, the second invention is superimposed on the action of the first invention,
The endless sanding belt presses against the workpiece while making a relative zigzag motion due to the combination of its left-right movement and the running of the workpiece, and grinds and polishes the workpiece. Therefore, the workpiece is given a grinding direction component perpendicular to the material feeding direction, and even if the endless sanding belt causes ripples X between the guide rollers, the workpiece is smoothed into a flat surface by the grinding direction component. Therefore, in the second invention, by the action of the first invention, even if the shavings are generated, they are swept away to one side by the tread pressure belt, and the endless sanding belt is moved by its left and right reciprocating shaft 7. This results in a sufficient leveling effect.

<Example> Embodiments of the invention will be described with reference to FIGS. 1-6.

A lifting screw 3.3, which is rotated in conjunction with a motor M, is 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 able to move up and down. The material feeding device 2 has a material feeding belt 2a wrapped around a front and rear drive roll 2b and a driven roll 2c.
is running.

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 1 in a gate shape. A belt grinding device IO is supported on the sanding frame 4.

This belt grinding device IO will be explained.

The sanding frame 4 is provided with a suspension guide shaft 5.5 (guide member) in the width direction, and the suspension guide shaft 5, 5 is provided with a mounting frame 11 serving as a base of the belt grinding device IO. A sliding piece 12.degree. 12 is fitted to support the mounting frame 11 so as to be movable along the suspension guide shaft 5.5 in a direction (left and right) intersecting the material feeding direction.

Drive guide rollers 14 and 15 are pivotally supported on the mounting frame 11 on the supply side and the discharge side by bearings 16 and 16, respectively. A spline shaft 17 is fitted to the extended end of each guide roller 14, 15. This spline shaft 17 has a drive motor M fixed to the main body frame 1,
The guide rollers 14 and 1 are connected by a belt.
5 is supported by bearings 16, 16 so as to be movable in the left-right direction, and is applied with the rotational force of a drive motor M3 via a spline shaft 17. Further, a spring 18 is attached to the spline shaft 17 to cushion the left and right reciprocating movement of the mounting frame 11, which will be described later.

A fitting portion 19 is formed between the guide rollers 14 and 15 of the mounting frame 11, and a tread pad device 20 is fitted into the fitting portion 19.

The configuration of the tread pad device 20 will be described below with reference to FIGS. 3 to 6.

A pedal pressure frame 21 is fitted into the fitting portion 19 . This tread pressure frame 21 is tightened by contacting the tapered locking portions 22 formed at the left and right ends of the upper surface with pieces 23 from the lower surface.
By tightening the lock handle 24, the fitting part 19 is tightly fixed to the ceiling surface (see FIG. 5).

Further, the tread pressure frame 21 has a wide lower part (see FIG. 6), and a belt guide groove 26 is formed on the wide part 25, and an elastic material such as sponge, rubber, or felt is formed on the lower surface of the wide part 25. A tread pressure pad 27 consisting of is fitted.

Traveling rollers 30a, 3 are provided at both ends of the wide portion 25.
0b is pivotally supported, a tread pressure belt 31 is stretched around the running rollers 30a and 30b, and the running part is connected to the belt guide groove 26.
The lower running portion thereof is brought into contact with the pressing surface of the tread pressure pad 27. Further, a frame 33 is fixed to one end of the wide portion 25, and the drive shaft of a drive motor M4 provided on the frame 33 is connected to one of the running rollers 30a.
The tread pressure belt 31 is connected to a rotating shaft of the motor M4, and the tread pressure belt 31 is caused to run in one direction by driving the drive motor M4. This tread pressure belt 31 comes into pressure contact with the inner surface of an endless sanding belt 50, which will be described later, as the endless sanding belt 50 becomes tense.

The supporting shaft of the traveling roller 30a is mounted on the side of a frame 33, and the frame 33 is fixed to the wide part 25 of the treading frame 21 through a long hole 34 so that fine movement can be adjusted. The running roller 30a is set at an appropriate position so that the tread pressure belt 31 can be stretched around it in a tensioned manner.

On the upper surface of the mounting frame 11, as shown in FIG.
7 and is supported so that it can swing. This support tube 3
7, a guide shaft 40 supported on the sanding frame 4;
(guiding member) is inserted.

Both ends of the steering roll 38 are provided with tension cylinders 41.
It is supported so that it can be moved up and down.

The steering frame 39 also includes a steering cylinder (not shown).
The head swings around the central axis 40.

Furthermore, a drive motor Ms, which serves as a reciprocating drive source for the belt grinding device 10, is mounted on the pedestal lc attached to the outer surface of the vertical frame lb, and a sprocket 42 fixed to the drive shaft is mounted on the pedestal lc attached to the pedestal 1c. It is connected by a chain to a sprocket 43 fixed on the lower surface side. An eccentric pin 44 is protruded from the sprocket 43, and the other end of a crank 45 pivotally supported on one end of the mounting frame 11 is connected to the eccentric pin 44. Then, driven by the drive motor MS, the crank 45 reciprocates with a stroke twice the eccentricity of the eccentric bin 44, and accordingly, the mounting frame 11 moves the suspension guide shaft 5.5. Sliding piece 12,1
2 and the guide shaft 40 (each constituting the guide member of the second invention), the guide shaft 40 is guided in the left-right direction and reciprocated.

Since the belt grinding device 10 has various components assembled to the mounting frame 11 and has a single body weight, the belt grinding device 10 is continuously reciprocated from side to side by the drive motor M5. With this configuration, the belt grinding device IO
An example of a left-right reciprocating device is constructed.

The above-mentioned guide rollers 14, 15. Steering roll running roller 3
An endless sanding belt 50 is wrapped around the belt guide mechanism consisting of 0, and the abrasive grain surface of the sanding belt 50 is brought into pressure contact with the workpiece supplied to the material feeding path by the tread pad device 20.

At this time, since the distance between the lower edges of the guide rollers 14 and 15 of the endless sanding belt 50 is long, tensile force is unevenly distributed in the width direction of the endless sanding belt 50, causing ripples X in the width direction. However, in the present invention, the belt grinding device IO is driven by a left and right reciprocating device such as a crank 45, and the suspension guide shaft 5,
5. Sliding piece 12.12 and guide shaft 40. Guided by a guide member constituted by a bearing 27 and the like, it continuously reciprocates in the left-right direction intersecting the material feeding direction. In accordance with this, the endless sanding belt 50 presses against the workpiece while making a relative zigzag movement due to the combination of its left-right movement and the running of the workpiece, and grinds and polishes the workpiece. Therefore, the abrasive grain surface of the workpiece is rubbed in the width direction by the left-right grinding direction component, and the workpiece is smoothed into a flat surface, thereby preventing uneven polishing and achieving a good polished surface.

On the other hand, since the above configuration is based on the left and right reciprocating movement of the endless sanding belt 50, if abrasive debris is interposed between the workpiece and the endless sanding belt 50, it will remain without being removed. However, in the present invention, the lower running portion of the tread pressure belt 31 runs while contacting the suppressing surface of the lower surface of the tread pressure pad 27, and moves in one direction substantially perpendicular to the endless sanding belt 50. Therefore, even if shavings are generated between the workpiece and the endless sanding belt 50, the movement of the tread pressure belt 31 sweeps them out toward the edge of the endless sanding belt 50, thereby preventing the abrasive swarf from accumulating. Also, this treading belt 31
This can also prevent the endless sanding belt 50 from undulating.

Therefore, due to the left and right reciprocating movement of the endless sanding belt 50 and the unidirectional running of the tread pressure belt 31, the workpiece is evenly ground and polished.

In the above-mentioned configuration, in the first invention, only the tread pressure belt 31 can be employed, and the left-right reciprocating mechanism for the endless sanding belt 50 can be removed. Further, the running direction of the tread pressure belt 31 is not necessarily limited to a configuration in which it is perpendicular to the endless sanding belt 50, but may be inclined to intersect with the endless sanding belt 50.

Incidentally, by employing both configurations as in the second invention, ripples of the endless sanding belt 50 can be more effectively prevented.

<Effects of the Invention> In the first invention, since the tread pressure belt is run in a direction crossing the endless sanding belt and treads on the inner circumferential surface of the endless sanding belt, the pressure generated between the guide rollers is reduced. As the ripples are spread out, the shavings accumulated between the endless sanding belt and the workpiece are swept out toward the edge of the sanding belt.

Moreover, in the second invention, superimposing on the first invention, the tread pressure pad and the belt guide mechanism are attached to a mounting frame and connected integrally, and the mounting frame is connected in the traveling direction of the processed material. Since it moves back and forth in the left and right direction that intersects with
A grinding direction component that intersects the running direction is generated in the grinding direction of the workpiece, and polishing unevenness on the surface of the workpiece is removed.

Therefore, each of the above-mentioned configurations has excellent effects such as being able to grind the workpiece uniformly and beautifully.

[Brief explanation of drawings]

FIG. 1 is a side view showing an example of a belt sander to which the present invention is applied, FIG. 2 is a partially cutaway front view of the same, FIG. 3 is a side view showing an enlarged view of the tread pad device 20, and FIG. A plan view, FIG. 5 is a front view of the same, and FIG. 6 is a cross-sectional view taken along the line AA in FIG. 4. Further, FIG. 7 is a perspective view of an endless sanding belt showing the problems of the conventional structure. l...Body frame 4...Sanding frame 10...Belt grinding device 5.5...-Hanging guide shaft 11...Mounting frame 12.12...Sliding piece 14.15-... Guide roller 20...-tread pressure pad device 21...tread pressure frame 27...tread pressure pads 30a, 30b...traveling roller 31...tread pressure belt 50...endless sanding belt Mρ15...drive motor

Claims (1)

[Scope of Claims] 1) A belt guide mechanism consisting of a plurality of roll groups including a tread pad provided on the material feeding path side and guide rollers arranged on both sides of the tread pad; In a belt sander machine in which a belt grinding device equipped with an endless sanding belt to be passed is installed opposite to a material feeding device, a belt sander is provided with an endless sanding belt that runs in one direction on the pressing surface of the tread pad in a direction intersecting the endless sanding belt. A belt sander machine characterized in that a tread pressure belt is provided, and the tread pressure belt is brought into pressure contact with the inner peripheral surface of an endless sanding belt. 2) A belt guide mechanism consisting of a tread pad placed on the material feeding path side, a plurality of roll groups including guide rollers arranged on both sides of the tread pad, and an endless sanding belt stretched around the belt guide mechanism. In a belt sander machine in which a belt grinding device equipped with a belt grinding device is installed opposite to a material feeding device, the tread pressure pad and the belt guide mechanism are attached to and integrally connected to a mounting frame, and the mounting frame is approximately It is supported on the main body frame side via the left and right guide members, and
The mounting frame is continuously reciprocated in a direction intersecting the material feeding direction by a left-right reciprocating device, and a treading belt that runs in one direction in a direction crossing the endless sanding belt is arranged on the pressing surface of the treading pad. A belt sander machine characterized in that the tread pressure belt is brought into pressure contact with the inner peripheral surface of an endless sanding belt.