JPH0735011B2 - 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> An endless sanding belt is hung on a belt guide mechanism including front and rear guide rollers supported on a material feeding passage side, and a grinding device in which a tread pad is arranged inside the endless sanding belt is used as a material feeding material. Belt sander machines, which are arranged facing the device, are known.

<Problems to be Solved by the Invention> In the configuration of a conventional grinding device, as shown in FIG.
Looking at the tension state of the endless sanding belt c between the guide rollers a and b, since the endless sanding belt c is wide and 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. However, it is usual to generate a wavy x 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 inclined with respect to the running direction of the processed material, and a polishing direction component in a direction (horizontal direction) orthogonal to the material feeding direction is applied to the processed material to remove polishing unevenness. 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 Problem> The present invention provides a grinding device including a pad device and a belt guide mechanism configured by a plurality of rolls including guide rollers arranged on both sides of the pad device, and a feeding device. In a belt sander machine that is arranged facing the material device, while fixing the pedaling frame on which the pad device is mounted to the main body frame side, each roll that constitutes the belt guide mechanism is mounted on the connecting frame to be integrated, The connection frame is supported on the main body frame side via a guide member in the left-right direction, and a left-right reciprocating device for continuously reciprocating the connection frame in the intersecting direction of the material feeding direction is connected to the connection frame. A spline shaft is formed at the extension end of the rotary shaft of the drive guide roller rotatably supported by the coupling frame by the bearing, and the spline shaft slides on the rotary boss. The drive motor fixed to the main body frame and the rotation boss are connected by a belt, and a spline shaft is provided between the rotation boss and the bearing of the drive guide roller. Is.

With this configuration, air can be ejected from the tread surface of the pad device.

<Operation> An endless sanding belt is stretched around the belt guide mechanism, is pressed by the pad device, and travels while being pressed against the processed material. At this time, the endless sanding belt, along with the connecting frame, is in the direction orthogonal to the material feeding direction (left-right direction).
Continuously reciprocates to. On the other hand, the pad device remains held immovably in the left-right direction. For this reason,
Even if the sanding belt undulations x occur between the guide rollers of the belt guide mechanism, the pad device and the sanding belt reciprocate relative to each other in the left-right direction, and the sanding belt is flattened by the tread surface of the pad device. Be leveled. 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 left-right direction, and the rotation boss and the drive 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. Thus, the processed material is free from unevenness of polishing, and a good polished surface can be achieved.

Further, in the configuration in which the pressure air is jetted from the treading surface of the treading pad, the sanding belt can be pressed in a flat shape, and the sanding belt can be leveled in a flat shape by overlapping with the above configuration.

<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,
Connection frame equipped with a belt guide mechanism as described below
The treading frame 19 and the pedaling frame 19 are supported to form a grinding device 10.

The grinding device 10 will be described.

Support plates 4a, 4a are provided on the left and right of the sanding frame 4.
And a pedaling frame 19 is supported on the support plates 4a, 4a. A fitting portion 20 is formed on the pedaling frame 19, and a pad device 21 is fitted on the fitting portion 20.

As shown in FIG. 3, the pad device 21 includes a pad support piece 24 and a treading pad 23 made of an elastic material such as sponge, rubber or felt whose lower surface is covered with a wear resistant coating strip 22 such as cloth. The work material is a tread pad by the pressure control of the air chamber (not shown) installed inside the tread frame 19.
When it comes directly below 23, the treading surface 21a is pushed downward, and the endless sanding belt 41 described later is pressed against the upper surface of the processed material.

Further, the suspension guide shafts 5, 5 are laterally passed over the outer sides of the support plates 4a, 4a of the sanding frame 4 so as to slide on the connection frame 11 on the suspension guide shafts 5, 5. Pieces 12, 12 are fitted, the connecting frame 11 along the suspension guide shafts 5, 5,
It is supported so that it can be slightly moved in the direction (left-right direction) orthogonal to the material feeding direction.

Drive guide rollers 14 and 15 are pivotally supported by bearings 16 and 16 on the supply side and the discharge side of the connecting frame 11, respectively.
A spline shaft 17a is fitted and fixed to the extended end of the rotation shaft of each of the guide rollers 14 and 15. This spline shaft 1
7a is inserted slidably rotating boss 17b and the drive shaft and the rotation boss 17b of the drive motor M ₃ which is fixed to the body frame 1 in tandem with the belt 45, thereby driving the guide rollers 14, 1
While 5 is supported so that it can move to the left and right, the spline shaft 1
The turning power of the drive motor M ₃ is applied via 7a. Also,
A spring 18 is attached to the spline shaft 17a between the rotating boss 17b and the bearings 16 of the drive guide rollers 14 and 15, so that the mounting frame 11 can be reciprocated left and right in a buffer manner.

A support cylinder 25 is erected on the upper surface of the connecting frame 11, and a steering frame 31 that supports the steering roll 30 in a freely rotatable manner is inserted into the support cylinder 25 through a center shaft 32. It is supported so that it can swing. In this support cylinder 25, a guide shaft 26 (guide member) protruding in the left-right direction is inserted into a bearing 27 provided in the sanding frame 4, and further, a left-right insertion punch having both ends fixed to the sanding frame 3 side. 28 penetrates,
It is urged inward by the springs 29, 29 fitted on both the left and right sides.

The support shafts 35, 35 at both ends of the steering roll 30 are lift guide plates 33,
The tension cylinders 34, 34 supported by the 33 and linked to the elevating guide plates 33, 33 urge upward. Also,
The steering frame 31 is connected to a steering cylinder (not shown) and makes a swing motion about a central shaft 32. An endless sanding belt 41 is wound around the belt guide mechanism including the guide rollers 14 and 15 and the steering roll 30 described above.

Further, as shown in FIGS. 2 and 4, a drive motor M _{3 serving as} a reciprocating drive source of the belt grinding device 10 is mounted on a mount 1c attached to the outer surface of the vertical frame 1b, and its drive shaft The sprocket 37 fixed to the above is connected to the sprocket 38 fixed to the lower surface side of the pedestal 1c by a chain. An eccentric pin 39 is projected on the sprocket 38, and a crank 40 pivotally supported (42) at one end of the connecting frame 11 is provided.
Is connected to the eccentric pin 39. Then, by the drive of the drive motor M ₄ , the crank 40 reciprocates with a stroke that is twice the eccentric amount of the eccentric pin 39, and with this,
The connecting frame 11 is guided in the left-right direction and reciprocates by the action of the suspension guide shafts 4, 4, the sliding pieces 12, 12, the guide shaft 26, and the bearing 27 (each of which constitutes a guide member of the present invention). Since the belt driving mechanism constituted by the guide rollers 14 and 15 and the steering roll 30 mounted on the connecting frame 11 is integrated, the driving motor M ₄ continuously reciprocates left and right. It will be. Along with this, the endless sanding belt 41 reciprocates in the left-right direction with respect to the tread surface 21a, and the endless sanding belt 41 is relatively moved.
While being leveled by the tread surface 21a, the material is pressed against the processed material and subjected to grinding and polishing. Thus, an example of the left and right reciprocating device of the belt grinding device 10 is configured with this configuration.

In addition, pressure rollers 51a and 51b, which are urged in a pressing direction by an ammunition machine 50, are disposed in front of and behind the grinding device 10 (see FIG. 1).

In this configuration, the endless sanding belt 41,
Since the distance between the lower edges of the guide rollers 14 and 15 is long, the tensile force is unevenly distributed in the width direction of the guide rollers 14 and 15, and the waviness x occurs in the width direction. However, in the present invention, the connecting frame 11 is driven by the left and right reciprocating device such as the crank 40, guided by the hanging guide shafts 5, 5, and the sliding pieces 12, 12, and is orthogonal to the material feeding direction. It continuously reciprocates in the left-right direction. And with this,
Guide roller 1 with endless sanding belt 41
Since the belt driving mechanism constituted by the steering rolls 30, 4 and 15 is integrated, the belt motor is continuously reciprocated right and left by the driving motor M ₄ .

On the other hand, the tread pad 23 of the pad device 21 is
Is fixed to the sanding frame 4, it does not follow even if the belt drive mechanism moves left and right.

For this reason, the treading pad 23 and the endless sanding belt 41 move relative to each other in the left-right direction, and even if the endless sanding belt 41 undulates between the guide rollers 14 and 15, the treading pad 23 makes the surface even. While being processed, it is pressed against the processed material and subjected to grinding and polishing. Thus, the processed material can prevent uneven polishing and achieve a good polished surface.

In the above-mentioned embodiment, as shown in FIG. 5, the wear-resistant coating band 22 and the tread pad 23 attached to the pad support piece 24 are used.
Is used as a breathable material, and an air jet path 50 is formed in the pad support piece 24, the jet end 51 opening to the inner upper surface of the breathable tread pad 23, and the communicating passage is connected to a compressed air source. It is also possible to disperse the pressure air injected from the inside of the breathable tread pad 23 and eject it from the tread surface 21a. 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. Furthermore, as shown in FIG.
Is integrally formed of a steel material, an air chamber 56 is formed inside the tread surface, and an air injection path 57 formed in the tread pad 55 is used.
The air chamber 56 may be communicated with a high-pressure air source, and the pressure air may be ejected from the innumerable discharge holes 58 formed in the tread surface 21a. 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 has been made clear in the above description, the present invention reciprocates the connecting frame 11 in the left-right direction orthogonal to the traveling direction of the processed material, and holds the tread pad 23 immovably in the left-right direction. Then, the tread pad 23 and the endless sanding belt 41 are relatively moved in the left-right direction. Therefore, the endless sanding belt 41 comes into pressure contact with the work material while being flattened by the treading pad 23, so that uneven polishing of the surface of the work material is removed and the work material can be ground uniformly and beautifully. Further, unlike the conventional structure in which the endless sanding belt is inclined and travels, 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, in the configuration in which the pressure air is jetted from the tread surface 21a of the pad device 21, the sanding belt is pressed in a planar shape and overlaps with the above configuration, so that the ripple x of the sanding belt can be prevented.

And so on.

[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 a grinding device 10 in an enlarged scale, and FIG. It is a figure.
FIGS. 5 and 6 are partial side views of the pad device 21 capable of injecting air from the tread surface 21a, and FIG. 7 is a perspective view of the endless sanding belt showing the problems of the conventional structure. 1 …… Main body frame 4 …… Sanding frame 5,5 …… Hanging guide shaft 10 …… Grinding part 11: Connecting frame 12,12 …… Sliding piece 14,15 …… Guide roller 16,16 …… Bearing 17a ...... Spline shaft 17b …… Rotating boss 18 …… Spring 19 …… Treading frame 21 …… Pad device 21a …… Treading surface 26 …… Guide shaft 30 …… Steering roll 39 …… Eccentric pin 40 …… Crank 41 …… Endless sanding belt 50 …… Air injection path 51 …… Spout end 55 …… Treading pad 57 …… Air injection path 56 …… Air chamber 58 …… Discharge hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Hitoshi Kawakita, 1-1, Minamihama-dori, Mizuho-ku, Nagoya, Aichi Prefecture, Takeuchi Iron Works Co., Ltd. (56) -90663 (JP, A) JP-B-38-11500 (JP, B1)

Claims (2)

[Claims] 1. A pad device provided on the side of a material feeding passage, and a belt guide mechanism composed of a plurality of rolls including guide rollers arranged on both sides of the pad device and around which an endless sanding belt is stretched. In the belt sander machine in which the grinding device is installed in opposition to the material feeding device, the treading frame on which the pad device is mounted is fixed to the main frame side of the main body, and each roll constituting the belt guide mechanism is mounted on the connecting frame. A left and right reciprocating device that supports the connection frame on the main body frame side via a guide member in the left-right direction and further reciprocates the connection frame in the direction intersecting the material feeding direction. A spline shaft is connected to an extended end of a rotation shaft of a drive guide roller which is rotatably supported by a connecting frame while being connected to the spline shaft. The in-shaft is slidably inserted into the rotation boss, the drive motor fixed to the main body frame and the rotation boss are connected by a belt, and a spring is formed on the spline shaft between the rotation boss and the bearing of the drive guide roller. A belt sander characterized by being attached. 2. A belt sander machine according to claim 1, wherein air is jetted from the tread surface of the pad device.