JP2579852B2 - Wide 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 wide 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 sanding machines disposed opposite a material device are known.

[0003]

An endless sanding belt is wound around a belt driving mechanism provided on a sanding frame, a treading device is arranged on the side of a material feeding passage, and the treading surface is brought into contact with the inner surface of the belt. In a wide belt sander machine in which one or a plurality of grinding heads are provided to a material feeding device via a material feeding passage, a work material is fed to a sanding belt by a single tread pad over the entire width. When pressed, the belt is pressed against the edge of the work material so as to cover the edge, and the corner falls to cause 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, the effectiveness is lost in the case of processing materials having different widths, peripheral shapes having irregular shapes, or frame materials.

In view of this, there is provided a stepping device 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 a plurality of pressing members corresponding to each pressing member are provided in front of the stepping device. A work material detector is arranged in a row in the width direction, and based on the width direction column data from the work material detector group, a pressure conversion device is provided for individually controlling the pressure of each air cylinder of each pressing member. A wide belt sander machine has been proposed.

On the other hand, in the conventional construction, as shown in FIG. 6, 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 means for solving this problem, a belt grinding device having an endless sanding belt wound around a belt guide mechanism including front and rear guide rollers, and a tread pad provided inside the endless sanding belt, is provided by a main body 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.

According to the present invention, there is provided a reciprocating drive motor having a stepping device in which a plurality of pressing members are arranged in a row in a width direction, and which continuously reciprocates a belt grinding device with respect to a material feeding device by a crank mechanism. It is an object of the present invention to provide a belt sander capable of selectively performing both functions.

[0007]

According to the present invention, an endless sanding belt is wound around a belt driving mechanism, a stepping device is arranged on a side of a material feeding passage, and the stepping surface is brought into contact with the inner surface of the belt. A plurality of grinding heads are provided opposite to a material feeding device via a material feeding passage, and a plurality of pressing members arranged in the width direction of the material feeding passage in the treading device; A number of air cylinders for connecting cylinder rods are provided, and in front of the treading device, a number of workpiece detectors corresponding to each pressing member are arranged in the width direction, and a width direction row from the workpiece detector group is provided. Based on the data, in a wide belt sander machine that performs pressure control on each air cylinder connected to each pressing member, a reciprocating drive motor and a crankshaft rotated by the reciprocating drive motor The bell A crank mechanism for continuously reciprocating the grinding device in the width direction with respect to the material feeding device; a control switch for reciprocating operation of the belt grinding device; and a predetermined rotation position of one of rotation shafts of a drive system of the crank mechanism. And a sensor that operates based on an OFF operation of the control switch, wherein the belt grinding device is detected by the sensor so as to stop at a fixed position corresponding to the front and rear of the workpiece detector group. And timing control means for stopping and controlling the reciprocating drive motor based on a predetermined position.

[0008]

When the reciprocating operation control switch is on, the reciprocating drive motor is driven, the crankshaft is rotated, and the belt grinding device is continuously reciprocated in the width direction with respect to the material feeding device. I do. As a result, the endless sanding belt
Due to the combination of the left and right movement and the traveling of the work material, the work material is pressed while being relatively zigzag and subjected to grinding and polishing. For this reason, the work material is provided with a grinding direction component in a direction perpendicular to the material feeding direction, and even if the sanding belt undulations x occur between the guide rollers, the grinding direction component flattens the surface to remove polishing unevenness. As a result, good polished skin can be achieved.

On the other hand, in order to grind and grind a workpiece having a different width, a non-uniform outer peripheral shape, or a frame having a hole at the center, the row data in the width direction from the workpiece detector group is used. In the case where the pressure control to the air cylinder connected to each pressing member is performed on each of the individual members, as described above, the belt grinding device is continuously reciprocating in the width direction with respect to the material feeding device. In addition, the relationship between each processing material detector and each pressing member is not specified. Therefore, when performing such a grinding mode, the control switch for reciprocating operation is turned off.

If the reciprocating drive motor is stopped at the same time as the turning off, the position of the belt grinding device becomes unstable, and individual control by the pressing member cannot be performed. Thus, when the control switch is turned off, the sensor detects a predetermined position of the crankshaft, and based on the predetermined position, the timing control means is turned on, and the reciprocating drive motor is stopped at a predetermined timing. Then, at this stop position, the belt grinding device stops at a fixed position corresponding to the front and rear of the workpiece detector group. That is, by this timing control means, even if the belt grinding device is operated by inertia even after the reciprocating drive motor is stopped, stop control by reading the inertial movement becomes possible,
As described above, the belt grinding device can be stopped at a fixed position.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a top-grinding type wide belt sander equipped with a single grinding head, and its configuration will be described.
A main body frame 10 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 10, and the main body frame 10 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. This material feeding device 4 has front and rear guide rollers 5, one of which is a driving roller.
A material feeding belt 7 is stretched around 5, and the upper surface thereof is used as a material feeding passage.

A sanding frame 11 is supported by the main body frame 10 so as to be movable in the width direction so as to correspond to the material feeding device 4 up and down. A belt grinding device 12 is supported on the sanding frame 11. The belt grinding device 12 includes a driving guide roller 14 on the supply side of the sanding frame 11 and a guide roller 1 on the discharge side.
5 are pivotally supported, and a tread pad device P is disposed between the guide rollers 14 and 15. Further, the steering roll 13 is supported on the upper part of the sanding frame 11 by a support cylinder 17 so as to be able to swing, so that the guide rollers 14, 15 and the steering roll 1 are supported.
Endless sanding belt 1
6 is over.

Next, the structure of the stepping pad device P will be described with reference to FIGS.
3 will be described. Here, reference numeral 18 denotes a mounting frame fixed to the sanding frame 11 and disposed between the rolls 14 and 15, and a treading frame 19 is hung on the mounting frame 18. A large number of treading bars 20 are held in the treading frame 19 so as to be able to move up and down in the width direction, and a spring 22 provided in a sliding groove 21 around the treading bar 19 urges the treading bar 20 upward. .

Further, a pressing member 23 is fixed to the lower end of each treading bar 20, and an elastic body 24 made of sponge or the like is disposed so as to cover the plurality of pressing members 23 from the lower surface. Abrasive cloth 2 fixed on both lower sides
5.

The upper end of the treading bar 20 is connected to a piston rod of an air cylinder 27 fixed to the mounting frame 18, and by introducing compressed air into the air cylinder 27, the piston 21 is formed into a spout 22 in the air cylinder 27. The lower surface of the pressing member 23 is pressed against the inner surface of the elastic body 24. The air cylinder 27 is connected to an air source via an electromagnetic valve,
A non-stepping pressure state in which the inflow of pressurized air into the air cylinder 27 is interrupted to communicate with the outside air side;
7 is converted into a stepping pressure state communicating with the air source. Alternatively, the air cylinder 27 is connected to a low-pressure air source and a high-pressure air source via an electromagnetic valve, and a non-tread pressure state in which the inside of the air cylinder 27 communicates with the outside air, and a low tread pressure state in which the air cylinder 27 communicates with the low-pressure air source. Alternatively, the cylinder 27 may be controlled to be converted into a high stepping pressure state in which the cylinder 27 communicates with a high-pressure air source.

As shown in FIGS. 4 and 5, on the material feeding device 4 before and after the sanding frame 11, there is provided a detection roll 30 which is pressed against the running material device 4 by an elastic machine. The detection roll 30 includes the pressing member 23,
As will be described later, in the fixed position state of the belt grinding device 12, the number of the detection rolls 3 may be set to correspond to the front and rear in a one-to-one relationship with the pressing member 23, or may be twice as many as the pressing member 23
0 is provided, and various correspondences are generated, such as arranging the pair of detection rolls 30 and 30 so that the unit interval thereof is equal to the width of the pressing member 23. In each case, the row data in the width direction is generated by the 30 rows of the detection rolls, and each pressing member 23 is converted into the non-treading pressure state and the treading pressure state as described above in accordance with the widthwise state of the workpiece. I do. Alternatively, in a further developed pressure control, the state is converted into a non-stepping pressure state, a low stepping pressure state, and a high stepping pressure state.

As shown in FIG. 4, the detection roll 30 is pivotally supported by a link 32 swinging about a support shaft 31. The link 32 is formed by a spring 3 mounted in a cylindrical body 33.
4, the lower end of the push rod 35 in the cylindrical body 33 is elastically contacted,
It is urged to rotate counterclockwise. At the upper end of the link 32, a detection bolt 36 is screwed so that its tip is located near the detection end of the proximity switch SW on the cylinder 33,
When the workpiece w is supplied and the tip of the workpiece 32 floats upward against the ridge 34, the link 32 rotates clockwise about the support shaft 31 and the tip of the detection bolt 32 approaches. It is separated from the detection end of the switch SW, thereby causing an ON operation (workpiece detection).
The distance between the tip of the detection bolt 32 and the proximity switch SW is adjusted by an adjusting screw 37 for abutting the tip on the outer surface of the cylindrical body 33.
Can be performed by the screwing operation. Thus, the work roll detector is constituted by the detection roll 30 and the proximity switch SW.

In the case where the workpieces having different widths, the outer peripheral shape is not uniform, or the frame having a hole in the center is ground and polished, the width direction from the workpiece detector group is determined. By applying pressure control to each of the air cylinders 27 connected to each of the pressing members 23 based on the row data, an optimum tread pressure is applied to the edge of the work material, and drooping of the edge is prevented, and good Grinding and polishing will be performed.

On the other hand, as shown in FIG.
A reciprocating drive motor 41 serving as a reciprocating drive source of the belt grinding device 12 is provided on the lower surface of the gantry 40 attached to the outer surface of the
Is mounted, and the sprocket 42 fixed to the drive shaft is
Similarly, it is connected to a sprocket 43 fixed to the upper surface side of the gantry 40 by a chain. A rotating pin 54 provided concentrically with the sprocket 43 has a crank pin 44
The other end of a crank 45 pivotally supported at one end of the sanding frame 11 is connected to the crank pin 44 to form a crank mechanism 46. The driving of the reciprocating drive motor 41 causes the crank 45 to reciprocate with a stroke twice as much as the eccentric amount of the crank pin 44, whereby the sanding frame 11 is moved in the left and right directions by the action of the guide rails 9, 9. It is guided to and reciprocates. Since the belt grinding device 12 is assembled to the sanding frame 11 and is integrated, the belt grinding device 12 reciprocates left and right continuously by the reciprocating drive motor 41. Thus, an example of the left and right reciprocating device of the sanding frame 11 is configured by such a configuration.

The operation of the reciprocating mechanism will be described. The endless sanding belt 16 includes guide rollers 14,
Since the distance between the lower edges of the 15 is long, the tensile force is unevenly distributed in the width direction, and a wavy x occurs in the width direction as shown in FIG. However, the belt grinding device 12, together with the sanding frame 11, is driven by the crank mechanism 46, is guided by the guide rails 9, 9 and reciprocates continuously in the left-right direction perpendicular to the material feeding direction. In association with this, the endless sanding belt 16 is pressed against while being relatively zigzag-moved by the combination of the lateral movement of the work material and the traveling of the work material, and is subjected to grinding and polishing. For this reason, the processed material is rubbed against the abrasive grain surface in the width direction by the left and right grinding direction components, and is leveled to prevent uneven polishing, so that a good polished surface can be achieved.

As described above, the belt sander according to the present embodiment controls the pressing force of each pressing member 23 separately, and thereby, based on the width direction row data from the group of processing material detectors,
It has a function that can perform optimal grinding and polishing corresponding to the state of the workpiece in the width direction. On the other hand, the belt grinding device 12 has a function of reciprocating in the width direction to prevent the endless sanding belt 16 from waving x. However, these two types of functions cannot be generated simultaneously. This is because the former is a configuration that can be achieved by specifying the front-back relationship between each pressing member 23 and the workpiece detector.

Therefore, the following configuration is provided as a main part of the present invention. The reciprocating drive motor 41 is connected via a sensor 51 and a timer 52 to a reciprocating operation control switch 50 composed of a push button switch for controlling the drive. Then, as described above, the belt grinding device 12
When the workpiece is to be reciprocated in the width direction, the reciprocating operation control switch 50 is turned on, and when the processing material is odd-shaped or a frame material, each of the pressing members 23 is to be controlled separately. If so, turn it off. The following control can be performed by this OFF operation.

The sensor 51 determines a reference position of the sanding frame 11 (belt grinding device 12). That is, a slit 55 is formed at one portion of the peripheral portion of the rotary plate 54 fixed to the shaft of the sprocket 43 of the drive system of the crank mechanism 46. Then, the rotating plate 54
A sensor 51 for reading the slit 55 is provided on the periphery of the sensor 51. For this reason, the belt grinding device 12 makes one reciprocation in the width direction by one rotation of the rotary plate 54, so that the slit 55
, The reference position of the belt grinding device 12 can be specified. The rotating plate provided with the slit 55 is fixed to any one of the rotating shafts of the drive system of the crank mechanism 46 such as the drive shaft of the reciprocating drive motor 41 separately from the one for fixing the crank pin 44. Can be done.

The sanding frame 11 is loaded with various members and has a large load. For this reason, inertia acts, and the movement of the sanding frame 11 does not stop at the same time as the drive of the reciprocating drive motor 41 is stopped. Therefore, when the belt 55 is provided at a fixed position corresponding to each pressing member 23 before and after the belt grinding device 12, the slit 55 does not actually stop at the fixed position due to inertial movement. . Therefore, the slit 55 is detected by the sensor 51 before the belt grinding device 12 is set at the fixed position, and the timer 52 is driven based on the detection, and the reciprocating drive is performed in synchronization with the timed completion of the timer 52. The driving of the motor 41 is stopped. Thus, by observing the inertial movement stroke of the belt grinding device 12 in advance and stopping the reciprocating drive motor 41 at a timing earlier than the fixed position of the belt grinding device 12 by the stroke, the belt grinding is performed. The device 12 can always be positioned at a fixed position with the turning-off operation of the reciprocating operation control switch 50.

By the way, it is also conceivable that the time when the sensor 51 detects the slit 55 is the time when the inertia movement stroke is advanced. However, in such means, the inertial movement stroke may be different for each model due to various conditions, and may change later even for the same model. Therefore, the timer 52 is provided as an adjustable timing control means. still,
If the sensor 51 can be moved in the circumferential direction with respect to the rotating plate 54, this constitutes a timing control means. If the rotation of the rotation plate 54 can be adjusted with respect to the sensor 51 so that the detection timing of the rotation plate 54 can be changed, this becomes the timing control means.

Thus, the belt sander of this embodiment is
By turning on / off the reciprocating operation control switch 50, the two types of grinding and polishing modes can be selectively executed without any trouble.

[0027]

According to the present invention, as has been clarified in the above description, the pressing force of each pressing member 23 is controlled separately.
Based on the width direction column data from the work material detector group, a function capable of performing optimal grinding and polishing corresponding to the state of the work material in the width direction, and reciprocating the belt grinding device 12 in the width direction. A function for preventing the endless sanding belt 16 from waving x, and the selection of the function is executed by turning on and off the reciprocating operation control switch 50 of the motor 41 for reciprocatingly driving the belt grinding device 12. And the reciprocating drive motor 41
A sensor 51 for detecting a predetermined rotation position of one of the rotation axes of a drive system of the crank mechanism 46 for converting the driving force of the belt grinding device 12 into reciprocating motion;
Timing control means for controlling a stop timing of the reciprocating drive motor 41 based on a predetermined position detected by the sensor 51 so that the stop is at a fixed position corresponding to the front and rear of the workpiece detector group. Since the belt grinding device is stopped at a fixed position corresponding to the workpiece detector group before and after, the above-described two functions can be generated without any trouble, and the usefulness of this type of belt sander can be increased. And other excellent effects.

[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 vertical sectional side view of the treading pad device P.

FIG. 3 is a front view showing a left portion of the tread pad device P cut away.

FIG. 4 is a partially cutaway side view of a workpiece detector.

FIG. 5 is a front view of a work material detector group.

FIG. 6 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 main body frame 11 sanding frame 12 belt grinding device 16 endless sanding belt 23 pressing member 41 reciprocating drive motor 46 crank mechanism 50 reciprocating operation control switch 51 sensor 52 timer 54 rotating plate 55 slit P pressure pad device

Claims (1)

(57) [Claims] An endless sanding belt is wound around a belt driving mechanism, and a stepping device is arranged on a side of a material feeding passage, and one or a plurality of grinding heads having the stepping surface in contact with the inner surface of the belt are provided. A number of pressing members arranged in the width direction of the material feeding passage, and a large number of air connecting the cylinder rod to each pressing member, which is provided opposite to the material feeding device via the material feeding passage, and is provided on the treading device. A plurality of workpiece detectors corresponding to each pressing member are arranged in a row in the width direction in front of the stepping device, and each pressing member is provided based on width direction row data from the workpiece detector group. A wide-belt sander machine configured to apply pressure control to each of the air cylinders connected to the reciprocating drive motor, and the reciprocal drive motor rotates a crank shaft to feed the belt grinding device. For the device A crank mechanism for continuously reciprocating in the width direction, a control switch for reciprocating operation of the belt grinding device, a sensor for detecting a predetermined rotation position of one of rotation axes of a drive system of the crank mechanism, and the control The reciprocating operation is performed based on a predetermined position detected by the sensor so that the belt grinding device stops at a fixed position corresponding to the front and rear of the work material detector group. A wide belt sander machine comprising: timing control means for stopping and controlling a driving motor.