JPH0741532B2 - Belt sander machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a belt sander machine for grinding and polishing a wood surface.

<Prior Art> Equipped with a treading pad arranged on the material feeding passage side, a plurality of guide roll groups including guide rollers arranged on both sides of the treading pad, and an endless sanding belt hung over the guide roll group. A belt sander machine in which a belt grinding device is provided in opposition to a material feeding device is known.

<Problems to be Solved by the Invention> In the conventional structure, as shown in FIG.
Looking at the tension state of the endless sanding belt c between a and b, the endless sanding belt c is wide and the guide rollers a,
Since the distance between the lower edges of b is long, the tensile force is unevenly distributed in the width direction, and waviness x is usually generated in the width direction. Moreover, since the treading pad d is made of an elastic body, this waviness x is not directly corrected but comes into direct pressure contact with the processed material.

And for this reason, the surface of the processed material is not uniformly pressed,
Vertical stripe-shaped uneven polishing occurs. This unevenness is remarkable in the case of final finishing polishing such as coating polishing and causes deterioration of the finishing quality.

As a means for solving this problem, Japanese Patent Publication No. 47-33
956, as disclosed in JP-A-56-119363,
The running direction of the endless sanding belt is tilted with respect to the running direction of the processed material, and a polishing direction component in the direction intersecting the material feeding direction (left-right direction) is applied to remove the uneven polishing. There is something.

However, with such a means, it is necessary to widen the width of the sanding belt, and there is a drawback that the sanding device also becomes large.

An object of the present invention is to provide a belt sander machine capable of preventing uneven polishing without the above-mentioned drawbacks.

<Means for Solving the Problems> The present invention provides a plurality of guide roll groups including a treading pad arranged on the material feeding passage side, guide rollers arranged on both sides of the treading pad, and the guide roll group. In a belt sander machine in which a belt grinding device equipped with an endless sanding belt to be stretched is provided in opposition to a material feeding device, a tread pressure pad and a guide roll group are integrally attached to a mounting frame, and the mounting is performed. The frame is supported on the main body frame side via a guide member in a substantially horizontal direction, and a left and right reciprocating device that continuously reciprocates the mounting frame in a direction intersecting the material feeding direction is connected to the mounting frame, and a bearing is used. A spline shaft is connected to the extension end of the rotation shaft of the drive guide roller rotatably supported by the mounting frame, and the spline shaft is slidably inserted into the rotation boss and fixed to the main body frame. A drive motor and the pivot boss tandem with belt, is characterized in that the further the pivot boss was TsukeSo the power spring to the spline shaft between the bearings of the drive guide rollers.

In this invention, the mounting frame is supported by the sanding frame fixed to the main body frame side via the guide member in the left-right direction, and a buffer spring in the substantially left-right direction is interposed between the mounting frame and the sanding frame. A configuration is proposed.

Further, in this invention, air can be jetted from the tread surface of the tread pad.

<Operation> By continuously reciprocating the belt grinding device in the direction crossing the material feeding direction (generally left-right direction), the endless sanding belt is a combination of the lateral movement of the processed material and the traveling of the processed material. As a result, they are pressed against each other while relatively moving in a zigzag manner to perform grinding and polishing. Therefore, the processed material is
Even if a grinding direction component orthogonal to the material feeding direction is imparted and waviness x of the sanding belt occurs between the guide rollers, it is flattened by the grinding direction component. At this time, since it is linked to the drive motor that rotates the drive guide motor via the spline shaft, the endless sanding belt can be driven while being allowed to move in the substantially horizontal direction, and the rotation boss can be driven. Since the spline shaft is provided with a rib between the bearings of the guide roller, the impact at the time of reciprocal conversion is mitigated, and smooth continuous reciprocating motion is possible.

Further, in the configuration in which the cushioning spring in the substantially left-right direction is interposed between the mounting frame and the sanding frame, a smoother operation is guaranteed when the mounting frame reciprocates left and right.

Furthermore, in the structure in which the pressure air is jetted from the tread surface of the tread pad, the sanding belt can be pressed in a flat shape, and the sanding belt can be flattened in a flat shape by overlapping with the above structure.

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

Elevating screws 3,3 that rotate in conjunction with _{each other} by a motor M1 are inserted into the base portion 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 ascend and descend. It said transmission member device 2, Okuzai belt 2a the front and rear drive roll 2b, it passes over a driven roller 2c, unauthorized driving roll 2b transmission with Okuzai motor M ₂
The feeding belt 2a is run in connection with the feeding belt 2a.

Further, a sanding frame 4 is fixed on the material feeding device 2 on a vertical frame 1b formed in a gate shape on the base 1a of the main body frame 1. And in the sanding frame 4,
A belt grinding device 10 is supported.

The belt grinding device 10 will be described.

The sanding frame 4 has a widthwise hanging guide shaft.
5, 5 (guide members) are provided, and the sliding guides 12, 12 provided on the mounting frame 11 which is the base of the belt grinding device 10 are fitted to the suspension guide shafts 5, 5, and the mounting is performed. Guide shaft for hanging frame 11
It supports along 5 and 5 so that it can be moved slightly in the direction intersecting the material feeding direction (left-right 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 17a is fitted and fixed to the extended end of the rotation shaft of each drive guide roller 14, 15. The spline shaft 17a is slidably inserted into the rotary boss 17b, and the drive shaft of the drive motor M ₂ fixed to the main body frame 1 and the rotary boss 17b.
And the belt 45 to connect the drive guide roller.
14, 15 are supported so as to be movable in the left-right direction, and the rotational force of the drive motor M ₃ is applied via the spline shaft 17a.
Further, a spring 18 is attached to the spline shaft 17a between the rotary boss 17b and the bearings 16 of the drive guide rollers 14 and 15, so that the left and right reciprocating motion of the mounting frame 11 described later can be buffered.

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 in the fitting portion 19.

As shown in FIG. 3, the tread pad device 20 includes a tread frame 21 fitted to the fitting portion 19 and a sponge, rubber, the bottom surface of which is covered with a slip resistant abrasion-resistant band 22 such as cloth. A pad support piece 24 having a treading pad 23 made of an elastic material such as felt is mounted, and the work material is treaded by a pressure control of an air chamber (not shown) arranged in a mounting groove in the treading frame 21. When it comes directly under the pad 23, the lower surface of the pad is pushed downward, and an endless sanding belt 41 described later is pressed against the upper surface of the processed material.

A support cylinder 25 is erected on the upper surface of the mounting frame 11, and a steering frame 31 that supports the steering roll 30 so that the steering roll 30 can freely rotate is provided on the support cylinder 25. It is inserted and supported so that it can swing. The support cylinder 25 has a guide shaft 26 (guide member) protruding in the left-right direction inserted through a bearing 27 provided in the sanding frame 4.

A horizontal insertion rod 28 having both ends fixed to the side of the sanding frame 3 penetrates through the support cylinder 25, and is urged inward by buffer springs 29, 29 fitted on both left and right sides thereof.

Both ends of the steering roll 30 are supported by lifting guide plates 33, 33 and are urged upward by tension cylinders 34, 34 connected to the lifting guide plates 33, 33. Further, the steering frame 31 is connected to a steering cylinder (not shown),
Performs a swing motion around 32.

Further, as shown in FIGS. 2 and 4, a drive motor 36, which is a reciprocating drive source of the belt grinding device 10, is mounted on a pedestal 1c attached to the outer surface of the vertical frame 1b, and its drive shaft is mounted on the pedestal 1c. The fixed sprocket 37 is linked by a chain to a sprocket 38 which is also fixed to the lower surface side of the pedestal 1c. An eccentric pin 39 is projected from the sprocket 38, and the eccentric pin 39 is connected to the other end of a crank 40 pivotally supported at one end of the mounting frame 11. And the drive motor
The drive of 36 causes the crank 40 to reciprocate with a stroke twice as large as the eccentric amount of the eccentric pin 39, and accordingly, the mounting frame 11 causes the mounting guide frame 5, 5 Shaft 26, bearing
By the action of 27 (each constituting the guide member of the present invention), it is guided in the left-right direction and reciprocates. Since the belt grinding device 10 has various structures assembled to the mounting frame 11 and is integrated, the belt grinding device 10 can be continuously reciprocated right and left by the drive motor 36. Thus, an example of the left and right reciprocating device of the belt grinding device 10 is configured with this configuration.

As described above, the support cylinder 25 provided on the mounting frame 11 is penetrated by the insertion rods 28 in the left-right direction, both ends of which are fixed to the sanding frame 3, and buffer springs are provided on both the left and right sides thereof.
29,29 are fitted. For this reason, this mounting frame 1
At the time of movement of 1, the mounting frame is
When 11 is moved to one side, the buffer spring 29 in that direction is elastically contracted and can be converted into movement in the opposite direction without causing an impact, so that the mounting frame 11 can smoothly reciprocate.

An endless sanding belt 41 is stretched over a guide roll group consisting of the guide rollers 14 and 15 and the steering roll 30, and the working material supplied to the material feeding passage by the pedaling pad device 20 has an abrasive grain surface. Pressure contact.

At this time, the endless sanding belt 41 is a guide roller.
Since the distance between the lower edges of 14 and 15 is long, the tensile force is unevenly distributed in the width direction, and waviness x occurs in the width direction. However, in the present invention, the belt grinding device 10 is driven by the left and right reciprocating devices such as the crank 40, and the hanging guide shafts 5, 5, the sliding pieces 12, 1.
It is guided by a guide member composed of 2 and the guide shaft 26, the bearing 27, etc., and continuously reciprocates in the left-right direction intersecting with the material feeding direction. Along with this, the endless sanding belt 41 presses the processed material while performing a zigzag movement relatively by the combination of the lateral movement of the processed material and the traveling of the processed material to perform grinding and polishing. For this reason, the processed material is rubbed against the abrasive grain surface in the width direction by the grinding direction component in the left-right direction, and is flattened to prevent uneven polishing, so that a good polished surface can be achieved.

In addition, front and rear of the belt grinding device 10 are provided with pressing rolls 46a and 46b biased in a pressing direction by an ammunition machine 45 (see FIG. 1).

In the above-described embodiment, as shown in FIG. 5, an air injection passage 50 is formed in the pad support piece 24, the ejection end 51 of which opens to the inner upper surface of the breathable tread pad 23. Is connected to a compressed air source, the pressure air injected from the ejection end 51 is dispersed in the breathable tread pad 23, and the air is jetted from the tread surface of the tread pad 23 through the breathable wear-resistant coating band. It may be allowed to. In this case, the endless sanding belt 41 is flattened and smoothed by the jetting action of air, which is effective in preventing the ripples x.

Further, as shown in FIG. 6, the pedal pressure pad 55 is integrally formed of steel, an air chamber 56 is formed inside the pedal pressure surface, and the air chamber 57 is formed through an air injection passage 57 formed in the pedal pressure pad 55. Innumerable discharge holes formed on the tread surface 58 by connecting 56 to the high pressure air source
You may make it blow out pressurized air from 59. In this case, the endless sanding belt 41 is smoothed more evenly by the pressure copying action of the rigid body and the air jetting action.

<Effects of the Invention> As is apparent from the above description, the present invention includes a tread pad,
The guide roll group is attached to the mounting frame so as to be integrally connected, and the mounting frame is reciprocally moved in a substantially left-right direction intersecting the traveling direction of the processed material. A grinding direction component intersecting with the running direction is generated, uneven polishing of the surface of the processed material is removed, and the processed material can be ground uniformly and beautifully. In addition, unlike the conventional configuration in which the endless sanding belt is tilted to run,
The belt is not widened and the device is not enlarged. At this time, since the spline shaft is provided with a ridge between the rotary boss and the bearing of the drive guide roller, the impact at the time of reciprocal conversion is mitigated, and smooth continuous reciprocating motion is possible.

Further, when a shock absorbing spring in a substantially left-right direction is interposed between the mounting frame and the sanding frame, when the mounting frame reciprocates in the substantially left-right direction, a shock is alleviated and the mounting frame moves smoothly. Done

Further, since the sanding belt is pressed in a flat shape by injecting the pressure air from the tread surface of the tread pad, it is possible to prevent the wave x of the sanding belt from being overlapped with the above configuration, which is an excellent effect. .

[Brief description 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 cutaway front view of the same portion, FIG. 3 is a side view showing an enlarged belt grinding device 10, and FIG. It is a front view. FIGS. 5 and 6 are side views of a treading pad device having an air injection passage in the treading pad, and FIG. 7 is a perspective view of an endless sanding belt showing problems of the conventional structure. 1 …… Main 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 16,16 …… Bearing 17a …… Spline shaft 17b …… Rotating boss 18 …… Ring 23 …… Treading pad 26 …… Guide shaft 28 …… Insertion rod 29,29 …… Buffer spring 30 …… Steering roll 36 …… Drive motor 39 …… Eccentric pin 40 …… Crank 41 …… Endless sanding belt 50 …… Air injection path 51 …… Spray end 55 …… Treading pad 56 …… Air chamber 56 …… Air injection path 56 58 …… Treading surface 59 …… Discharge hole

Claims (3)

[Claims] 1. A tread pressure pad arranged on the side of the material feeding passage, a plurality of guide roll groups including guide rollers arranged on both sides of the tread pressure pad, and an endless sanding belt hung over the guide roll group. In a belt sander machine in which the provided belt grinding device is provided in opposition to a material feeding device, a treading pad and a guide roll group are integrally attached to a mounting frame, and the mounting frame is provided with a guide member in a substantially horizontal direction. Via the support frame to the main body frame side, and the mounting frame is connected to a left and right reciprocating device for continuously reciprocating the mounting frame in a direction intersecting the material feeding direction, and is rotatably supported by the mounting frame by bearings. A spline shaft is connected to the extended end of the rotary shaft of the drive guide roller, and the spline shaft is slidably inserted into the rotary boss, so that the drive motor fixed to the main body frame and the rotary boss. A belt sander machine characterized in that it is connected by a belt, and a spline shaft is provided between the rotation boss and the bearing of the drive guide roller. 2. The mounting frame is supported by a sanding frame fixed to the main body frame side via a guide member in the left-right direction, and a buffer spring in the substantially left-right direction is interposed between the mounting frame and the sanding frame. The belt sander machine according to claim 1, wherein: 3. The belt sander machine according to claim 1, wherein air is jetted from the tread surface of the tread pad.