JP2649465B2 - Belt grinding machine for belt sander machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt grinding apparatus for a belt sander for grinding and polishing a wood surface.

[0002]

2. Description of the Related Art An endless sanding belt is wound around a belt guide mechanism including front and rear guide rollers supported on a material feeding passage side, and a belt grinding device having a tread pad provided inside the endless sanding belt is fed. Belt sanders disposed opposite to the material device are widely known.

By the way, an endless sanding belt is wound around a belt driving mechanism provided on a sanding frame, a treading device is arranged on a side of a material feeding passage, and one to a plurality of treading surfaces are brought into contact with the inner surface of the belt. In a belt sanding machine in which the belt grinding device of the above is opposed to the material feeding device via the material feeding passage, when the work material is pressed against the sanding belt by a single treading pad over the entire width thereof, the processing is performed. At the edge of the material, the belt is pressed to cover the edge,
The corners fall, causing edge dripping. Therefore, it is necessary to reduce the tread pressure of the tread pad at this edge. However, if this pressure control is performed uniformly in the width direction of the treading pad,
Efficacy is lost for workpieces with different widths, irregularly shaped peripheral shapes, or frame materials.

Therefore, a stepping device is provided in which a plurality of pressing members each connected to a rod of an air cylinder are arranged in a row in the width direction, and in front of the stepping device,
A large number of workpiece detectors corresponding to each pressing member are arranged in a row in the width direction, and pressure control for each air cylinder of each pressing member is performed on each of the individual members based on width direction row data from the workpiece detector group. A belt sander equipped with a pressure converter has been proposed.

On the other hand, in the conventional configuration, as shown in FIG. 5, when the tension of the endless sanding belt c between the guide rollers a and b is viewed, the endless sanding belt c is wide and the guide rollers a , B are long, the tensile force is unevenly distributed in the width direction, and the ripple x
Is generated. For this reason, the surface of the processed material is not evenly pressed, resulting in vertical streak-like polishing unevenness. This unevenness is conspicuous in the case of final finishing polishing such as painting polishing, and causes a reduction in the finishing quality. As a means for solving this problem, a belt grinding device including an endless sanding belt wound around a belt guide mechanism including front and rear guide rollers, and a stepping pad provided inside the endless sanding belt, is provided by a sanding frame. The belt sanding machine is supported in such a manner that the belt grinding device is continuously reciprocated in a direction crossing the material feeding direction by a left and right reciprocating device. It was proposed in Kaihei 2-83159.

[0006]

Based on each of the above-described structures, a configuration in which a belt grinding device is continuously reciprocated in a direction intersecting with a material feeding direction by a left and right reciprocating device with respect to a material feeding device is provided by a plurality of pressing means. It is conceivable to apply the present invention to a configuration provided with a stepping device in which members are arranged in rows in the width direction.

That is, inside the endless sanding belt on the side of the material passage, there are provided a large number of pressing members arranged in a row in the width direction of the material passage and a large number of air cylinders for pushing each pressing member. A belt grinding device provided with a stepping device is provided to the material feeding device via the material feeding passage, and further, in front of the stepping device, a number of workpiece detectors corresponding to each air cylinder are arranged in the width direction. It is possible to propose a belt sander equipped with a pressure conversion device that is arranged in rows and controls each air cylinder based on the width direction row data from the work material detector group.

However, in such a configuration, when the belt grinding device moves, there is a problem that the movement between the workpiece detector and the pressing member is shifted by the amount of the movement. If this problem is left unchecked, the meaning of the pressing members that can independently control the treading device is diminished.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a belt sander having a structure capable of maintaining a correspondence between a workpiece detector and an air cylinder even when such a stepping device moves in the width direction. is there.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a reciprocating drive device which supports a pad frame on a sanding frame supporting a belt driving mechanism via a guide member in the width direction and continuously reciprocates the pad frame in the width direction. Are provided in the sanding frame, a number of air cylinders are arranged in a row in the width direction, and a pressure contact piece is fixed to a lower end of each rod hanging downward, and a number of pressing members are attached to the pad frame by the air. Arrange vertically in the width direction so as to coincide with the cylinder row up and down, and with the arrangement interval of the air cylinder, and furthermore, each pressure contact piece of the air cylinder is directly or flexibly mounted on each pressing member. As the pad frame is reciprocated by the reciprocating drive device, the pressing member row is pressed in a widthwise manner with respect to the pressure contact row of the air cylinder. So as to rub reciprocate to is obtained by constituting the belt grinding apparatus.

[0011]

With the reciprocating motion of the pad frame by the reciprocating drive, the pressing member row reciprocates in the width direction with respect to the pressure contact piece row of the air cylinder, and the position of the air cylinder in the width direction is unchanged. is there. Accordingly, the pressing members are sequentially controlled while moving under the control of the air cylinder immediately above the pressing members. That is, the treading pressure in the width direction of the treading device is determined only by the pressure of the air cylinder,
It is not affected by the reciprocation of the pad frame.

For this reason, in front of the stepping device, a number of workpiece detectors corresponding to each air cylinder are arranged in a row in the width direction, and based on the width direction row data from the workpiece detector group,
Even if the pressure control to each air cylinder is performed for each individual, it is not affected by the reciprocating motion of the pad frame.

[0013]

FIG. 1 is a top-grinding type belt sander provided with a single belt grinding apparatus 10, and its structure will be described. A body frame 9 is supported on the base 1. Elevating screws 2, 2, which are interlocked and rotated by an elevating motor, are inserted into support portions on both sides of the base 1 and the main body frame 9, so that the main body frame 9 can be moved up and down with respect to the base 1.
A material feeding device 4 is supported on the base 1 by frames 3 and 3 between the lifting screws 2 and 2. In the material feeding device 4, a material feeding belt 7 is wrapped around guide rollers 5, 5 which are driven rollers driven by a driving motor M (see FIG. 4), and the upper surface thereof is used as a material feeding passage. A slit plate f having a groove formed on the peripheral surface is fixed to the output shaft of the drive motor M, and a sensor k for detecting passage of the groove is provided on the slit plate f. The driving timing of the pedaling device P is controlled by the sensor k as described later.

A sanding frame 11 of a belt grinding device 10 is fixed to the main body frame 9 so as to correspond to the material feeding device 4 up and down. This belt grinding device 10
The drive guide roller 14 is pivotally supported on the supply side of the sanding frame 11 and the guide roller 15 is pivotally supported on the discharge side, and a stepping device P is disposed between the guide rollers 14 and 15. Further, as shown in FIG. 2, a steering roll 13 is supported on the upper part of the sanding frame 11 so as to be able to swing, and an endless sanding belt 16 is hung on a belt guide mechanism including the guide rollers 14, 15 and the steering roll 13. Have passed.

Next, the structure of the stepping device P will be described with reference to FIGS. At the bottom of the sanding frame 11,
Hanging guide rods 17 in the width direction are fixed to both sides,
The sliding pieces 18, 18 fixed to both ends of the treading frame 19 are externally fitted to the suspension guide rods 17, 17, and the treading frame 19 is suspended so as to be movable in the width direction.

The stepping frame 19 comprises a lower holding frame 19a and an upper mounting frame 19b.
The sliding pieces 18, 18 are fixed to a mounting frame 19b, and the holding frame 19a is detachable by a fixing member 29. In addition, the mounting frame 19b
Inside, an operating space for accommodating the lower end of the air cylinder 30 described later is generated.

In the holding frame 19a, a large number of pressing members 20 are fitted in elevating grooves 23, which have a reduced diameter and penetrate downward, and are arranged in the width direction so as to be able to move up and down. . The pressing member 20 has a large-diameter pressure-receiving portion 21 for shielding the elevation groove 23 at an upper end thereof, and a spring 25 provided in the elevation groove 23 is brought into contact with the lower surface of the pressure-receiving portion 21,
The pressing member 20 is urged upward.

At the center of the upper surface of the pressure-receiving portion 21,
A pressurized ball 24 is fitted on the lower hemisphere and is mounted so as to roll. Each pressing member 20 is covered with a flexible rubbing band 28 made of a wear-resistant material, and both ends thereof are fixed to the holding frame 19a. The inner surface of the flexible rubbing band 28 is point-contacted.

Further, a large-diameter tread portion 22 is provided at the lower end of each pressing member 20 projecting downward from the lifting groove 23. The tread portions 22 are closely connected in the width direction. An elastic body 26 made of sponge or the like is provided so as to cover the many treading portions 22 from the lower surface, and the elastic body 26 is covered with a wear-resistant cloth 27 fixed to both lower surfaces of the treading frame 19. The wear-resistant cloth 27 is brought into direct contact with the inner surface of the endless sanding belt 16.

On the other hand, on the lower surface of the sanding frame 11, air cylinders 30 are arranged in rows in the width direction.
The arrangement interval of the air cylinder 30 is determined by the pressing member 2
It is equal to the arrangement interval of 0. The lower part is inserted into the mounting frame 19b, and the rod 31 to which the pressure contact piece 32 is fixed is hung down at the lower end. The protruding base end of the rod 31 is inserted into and held by the connecting plate 33. The pressure contact pieces 32 are densely arranged in the width direction, and press the lower surface of the pressure contact piece 32 against the upper surface of the flexible rubbing band 28 at the operating position of the air cylinder 30, and press the pressing member through the pressure ball 24. 20 is applied with a tread pressure.

As shown in FIG. 4, the air cylinder 30 has solenoid valves V1 and V2 connected to a low-pressure air source P1 and a high-pressure air source P2.
(Pressure conversion device), a non-treading pressure state in which the inside of the air cylinder 30 communicates with the outside air, a low treading pressure state in which the air cylinder 30 communicates with a low-pressure air source, and a high treading pressure state in which the air cylinder 30 communicates with a high-pressure air source. The state and the conversion are controlled. Such control corresponds to the state of the work material based on the width direction data of the work material generated from the work material detector S group,
The control is selectively performed in a non-operation state, a low stepping pressure state, and a high stepping pressure state. Therefore, a single air source may be connected to the air cylinder 30 in the case of pressing or non-pressing selection control. Thus, the pressing member 20
The stepping device P is constituted by the air cylinder 30 and the like.

As shown in FIG. 1, a tread frame 1 is provided on the upper surface of a gantry 40 attached to the outer surface of the main body frame 9.
A reciprocating drive motor 41 serving as a reciprocating drive source 9 is fixed, and a sprocket 42 fixed to a drive shaft thereof is connected to a sprocket 43 also fixed to the lower surface side of the gantry 40 by a chain. A crank pin 44 protrudes from a rotating plate 48 provided concentrically with the sprocket 43, and the other end of a crank 45 pivotally supported on one side end of the mounting frame 19b of the treading frame 19 is connected to the crank pin 44. Pin 4
4 to form a crank mechanism 46. When the reciprocating drive motor 41 is driven, the crank 45 reciprocates with a stroke twice as much as the eccentric amount of the crank pin 44. Accordingly, the treading frame 19 is moved by the action of the suspension guide rods 17, 17. It reciprocates while being guided left and right. Thus, with such a configuration, the tread frame 1
An example of the nine reciprocating drive devices is configured.

On the other hand, at the front of the belt grinding device 10, a detection roll r shown in FIG. The detection roll r has a known structure in which the switch SW is turned on by vertical movement. The air cylinder 30 and the switch SW constitute a workpiece detector S. The detection rolls r may correspond to the air cylinder 30 in a one-to-one relationship with the front and rear, or may be provided with twice as many detection rolls r as the air cylinder 30 to provide a set of two detection rolls r, Various correspondences can be created, such as arranging the unit intervals of r so as to match the width of the air cylinder 30. In each case, the row data in the width direction is generated by the row of the detection rolls r, and the workpiece w
In accordance with the state in the width direction, each of the tread portions 22 is converted into the non-tread state and the tread state as described above. Alternatively, as described above, the pressure control is further developed into a non-treading pressure state, a low treading pressure state, and a high treading pressure state.

The above-mentioned respective controls are performed by the central control unit CPU shown in FIG.
Done by For this reason, the central control unit CPU
Proximity switch SW serving as an output source of the work material detector S
And a sensor k mounted on the slit plate f of the drive motor M, a counter C for sequentially counting pulses from the sensor k, and an exclusive OR circuit (Ex-OR circuit)
And the register R are connected, and according to the input information,
Switching of the solenoid valves V1 and V2 (pressure converter) is controlled.

In the case where the workpieces w having different widths, the outer peripheral shape is not uniform, or the frame having a hole at the center is ground and polished, the workpiece w By applying pressure control to each air cylinder 30 based on the width direction column data, an optimum tread pressure is applied to the edge of the work material, and dripping of the end is prevented, and good grinding and polishing are performed. The Rukoto.

On the other hand, the treading frame 19 reciprocates continuously with respect to the sanding frame 11 by a reciprocating drive device constituted by the reciprocating drive motor 41 and the like. The operation of such reciprocation will be described.

In the endless sanding belt 16, 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, and undulations x occur in the width direction as shown in FIG. However, the stepping frame 19 is provided with the crank mechanism 4.
6 and is guided by the suspension guide rods 17 and 17 and continuously reciprocates in the left-right direction perpendicular to the material feeding direction. In accordance with this, the row of pressing members 20 receiving the stepping force from the pressing pieces 32 by the urging force of the rows of air cylinders 30 abuts on the inner surface of the endless sanding belt 16 while reciprocating in the width direction and forming the work material. Due to the combination of the traveling of w, the workpiece w is pressed against the workpiece w while performing a relative zigzag motion. For this reason, the endless sanding belt 16 is leveled to prevent uneven polishing,
The processed material can achieve good polished skin.

In such a configuration, when the treading frame 19 moves in the width direction, the flexible rubbing band 28 rubs against the lower surfaces of the rows of the pressing pieces 32. And, the air cylinder 30
From the contact point of the pressurized ball 24 with each pressing member 20
Act on. At this time, the pressure ball 24 rotates appropriately,
Friction with the pressurized ball 24 caused by the bending operation of the flexible rubbing band 28 is reduced. Therefore, by the action of the flexible rubbing band 28 and the pressurized ball 24, the contact resistance associated with the reciprocation of the treading frame 19 is reduced.

Thus, each pressing member 20 receives the pressing action of the air cylinder 30 at the position immediately above, and is sequentially controlled as it moves in the width direction. That is, the treading pressure in the width direction of the treading device P is determined only by the pressure of the air cylinder, and is not affected by the reciprocating motion of the treading frame 19. For this reason, even when the air cylinder 30 is controlled by the width direction row data, the air pressure is not affected by the reciprocating movement of the treading frame 19.

[0030]

As described above, according to the present invention, 30 rows of air cylinders are provided on the sanding frame 11, and the stepping frame 19 is supported below the sanding frame 11 by a reciprocating drive so as to be able to reciprocate.
20 rows of pressing members are arranged vertically with the 30 rows of air cylinders, and as the treading frame 19 reciprocates,
Since the 20 rows of pressing members are reciprocated in the width direction with respect to the 32 rows of the pressure contact pieces of the air cylinder 30, the width position of the air cylinder 30 is immobilized. A number of workpiece detectors S corresponding to the cylinders 30 are arranged in a row in the width direction, and pressure conversion is performed on each of the air cylinders 30 based on the width direction row data from the workpiece detector group. Even when the apparatus is used, such control can be performed without hindrance, an optimal treading action can be performed, and good grinding and polishing can be performed in accordance with the shape of various processing materials. Has an excellent effect.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an example of a belt sander machine to which the present invention is applied.

FIG. 2 is a side view of the belt grinding device 10.

FIG. 3 is an enlarged front view of the stepping device P, showing a left half thereof cut away.

FIG. 4 is a block diagram of a control device.

FIG. 5 is a perspective view of an endless sanding belt c showing a problem of a conventional configuration.

[Description of sign]

 REFERENCE SIGNS LIST 4 material feeding device 10 belt grinding device 11 sanding frame 16 endless sanding belt 19 stepping frame 20 pressing member 24 pressurized ball 25 spring 30 air cylinder 32 pressure contact piece 28 flexible rubbing band 41 motor for reciprocating drive 46 crank mechanism P stepping device P1, P2 Air source V1, V2 Solenoid valve r Detecting roll S Workpiece detector CPU Central controller

Claims (1)

(57) [Claims] An endless sanding belt is wound around a belt drive mechanism composed of a plurality of guide rolls, and a plurality of belts are arranged inside the endless sanding belt on the side of the material feeding passage in the width direction of the material feeding passage. A belt grinding device provided with a pressing member and a plurality of air cylinders for extruding each pressing member, and a belt grinding device provided to the feeding device via the feeding path, and further comprising the stepping pressure. In front of the device, a number of workpiece detectors corresponding to each air cylinder are arranged in a row in the width direction, and pressure control for each air cylinder is individually controlled based on the width direction row data from the workpiece detector group. In a belt sander machine provided with a pressure conversion device to be applied, a pad frame is supported on a sanding frame supporting the belt driving mechanism via a guide member in a width direction. A reciprocating drive device for continuously reciprocating the drum in the width direction is provided, a number of air cylinders are arranged in the sanding frame in the width direction, and pressure contact pieces are respectively fixed to lower ends of the rods hanging down, A large number of pressing members are vertically arranged on the pad frame in the width direction so as to be vertically aligned with the air cylinder row, and to have an arrangement interval coinciding with the arrangement interval of the air cylinders. The pieces are pressed against each pressing member directly or via a flexible rubbing piece, and the reciprocating drive device causes the pad frame to reciprocate, so that the row of pressing members is pressed against the row of pressure contact pieces of the air cylinder. A belt grinding device for a belt sander, wherein the belt grinder reciprocates in the width direction.