JP2592371B2 - 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 used for grinding and polishing wood and the like.

[0002]

2. Description of the Related Art 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. The grinding head of a wide belt sander machine which is opposed to a material feeding device via a material feeding path, and when the working material is pressed against the sanding belt by a single tread pad over the entire width thereof, At the edge of the belt, the belt presses against 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 the above, 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 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 a lifting / lowering control device is provided for individually controlling the pressure of each pressing member to each air cylinder based on the width direction row data from the work material detector group. Wide belt sander machine, JP-A 1-159165, JP-A 1-246063
No. was proposed.

[0004]

The work material w to be applied includes a material having an uneven thickness, a material having a warp, and a material having the same thickness, such as a material having warpage. By the way, when these materials are uniformly ground and polished as in the case of the plate-like processed material as in the above-described conventional configuration, when a material having a dent or a warp is ground and polished at a thin portion at the center thereof, the warp is caused. In the case of the material, there is a problem that the warped portion of the peripheral edge is excessively ground and polished. Therefore, a configuration has been proposed in which a pressing member is moved up and down by a lifting motor in accordance with the thickness of the workpiece, and uniform grinding and polishing is performed according to the thickness of the workpiece. An object of the present invention is to provide a wide belt sander machine which has a configuration using such an elevating motor and can facilitate maintenance of a treading device.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an endless sanding belt which has an endless sanding belt wound around a belt driving mechanism and has a large number of pressing members arranged in the width direction of a material feeding passage. Arranged inside the sanding belt, one or more grinding heads configured to press the endless sanding belt against the workpiece by the pressing member are provided to the material feeding device via the material feeding path, and In front of the treading device, a number of work material detectors corresponding to each pressing member are arranged in a row in the width direction, and based on width direction column data from the group of working material detectors, The present invention relates to a wide belt sander machine that performs lifting control.

In such a wide belt sander, the treading device is provided with a large number of vertical sliding grooves which open downward and extends in the width direction, and communicates with the sliding grooves at the upper edge thereof. A tread frame to which a mounting plate having an operation hole formed thereon is fixed, and a locking flange is formed on the outer periphery, the upper end of which is inserted into the operation hole of the mounting plate, and a pressing member is fixed to the lower end. Numerous treading rods which are mounted in the sliding groove so as to be able to move up and down, and which are mounted around the treading rod in the sliding groove and whose upper end is elastically contacted with the locking flange to urge the treading rod upward And a pad member that covers the lower surface of each pressing member, and a wear-resistant cloth that is fixed to a treading frame that covers the pad member. Fitting of lower opening with wide locking groove edge on edge The upper portion of the treading frame is fitted into the fitting hole, and the mounting plate fixed to the upper edge of the treading frame is locked by the locking groove edge, so that the treading device is detachably attached to the side. Equipped with a mounting frame for hanging
Further, a plurality of lifting / lowering motors are disposed on the mounting frame immediately above the treading rods, and the lifting / lowering rods are screwed into the drive shafts thereof, and the lifting / lowering rods are disengaged by the screwing action accompanying the rotation of the drive shafts. The apparatus is characterized in that the apparatus is provided with an elevation control device configured to perform elevation control in stages, and configured so that the lower end of the elevation rod abuts on the upper end of the treading rod.

[0007]

The stepping device is linked only to a lifting rod screwed to a drive shaft of a lifting motor, and is unitized. Therefore, when the elevating rod screwed to the drive shaft of the elevating motor is retracted to the upper position, the locking flange of the treading rod elastically contacts the lower surface of the mounting plate due to the urging force of the spring, and that position is maintained, and It is separated from the lower end of the elevating rod, whereby the stepping device can be detached from the fitting hole of the mounting frame. As described above, the treading device can be easily attached to and detached from the mounting frame, and repair of the treading device due to wear of the wear-resistant cloth can be easily performed by removing the treading device. When the treading device is mounted, the lifting motor is driven to lower the lifting rod, whereby the lower end of the lifting rod comes into contact with the upper surface of the treading rod inserted into the operation hole of the mounting plate. The treading rod is linked with the lifting motor, and the height of the pressing member fixed to the lower surface of the treading rod is steplessly controlled by the driving of the lifting motor, and the width from the workpiece detector group is controlled. Based on the direction row data, the tread surface applies a uniform tread pressure corresponding to the height of the supplied work material to the work material. Therefore, the surface of the processed material is uniformly ground and polished.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and 2 show the application of the present invention to an upper surface grinding type wide belt sander equipped with a single grinding head. 4 is provided, and a top surface thereof is used as a material feeding passage 6. In addition, driving traveling roll 2
Is rotated by a drive motor M. As shown in FIG. 6, a slit plate f having a groove formed on a peripheral surface is supported on an output shaft of the drive motor M, and the slit plate f A sensor k for detecting passage of the groove is provided. That is, it is possible to detect the traveling amount of the workpiece w from the output from the sensor k.

A sanding frame 7 is provided on the main body frame 1 at an upper position of the material feeding device 5, and a grinding head is mounted on the frame 1. That is, a steering roller 8 is provided at the upper end of the sanding frame 7, and a large-diameter drive roll 9 and a driven roll 1 are provided at the lower end thereof.
No. 0 is provided to constitute a drive mechanism, and a sanding belt 11 is stretched over the roll group. Further, between the rolls 9 and 10, a treading device 12 is provided on the sanding frame 7.

FIGS. 2 and 3 show the structure of the treading device 12. FIG. A mounting frame 30 is disposed on the sanding frame 7 at a position between the rolls 9 and 10, and the treading device 12 is hung on the mounting frame 30.

The configuration of the stepping device 12 will be described. 1
Reference numeral 3 denotes a treading frame.
A large number of vertical sliding grooves 14 are provided in the width direction. Further, the mounting plate 15 in which a plurality of operation holes 16 communicating with the sliding grooves 14 in the vertical direction is fixed to the treading frame 13. The sliding groove 14 includes an urging hole portion 14a having a diameter larger than the inner diameter of the operation hole 16 in which the ridge 17 is mounted, and a sliding portion 14b having a diameter smaller than the urging hole portion 14a thereunder. The lower portion is opened to communicate with the pad mounting groove 18 which is long in the width direction. A stepping rod 20 having the same diameter as the sliding portion 14b is mounted in the sliding groove 14.
In the stepping rod 20, a locking flange 20a having substantially the same diameter as the urging hole 14a is formed at the position of the urging hole 14a.
The upper end of the projection 17 attached to the urging hole 14a around the treading rod 20 abuts on the lower surface of the locking flange 20a to apply the urging force to the treading rod 20. The upper end portion 20b of the stepping rod 20 has the same diameter as the operation hole 16, and the upper end portion 20b is inserted into the operation hole 16. As described later, when the upper end portion 20b is not pushed downward by the elevating rod 28, as shown in FIG.
As described above, the locking flange 20a elastically contacts the lower surface of the mounting plate 15 by the action of the ridge 17, and in this state, the treading rod 20 is held in the sliding groove 14 and the treading device 12 can be detached from the mounting frame 30. It becomes possible.

Further, a pressing member 21 is fixed to the lower end of each treading rod 20 in the pad mounting groove 18, and a pad member 22 made of an elastic material such as sponge is disposed so as to cover the plurality of pressing members 21 from the lower surface. The pad member 22
Is covered with a wear-resistant cloth 23 fixed to both lower surfaces of the treading frame 13.

In this manner, the treading device 12 is unitized and can be attached to and detached from the mounting frame 30. That is, the lower part of the mounting frame 30 has a fitting hole 31 of a lower opening having a wide locking groove edge 32 at the upper edge, and the main width of the fitting hole 31 is
And the locking groove edge 32 matches the mounting plate 15. For this reason, by pressing the mounting plate 15 from the side into the locking groove edge 32 and pushing the upper portion of the treading frame 13 into the main part of the fitting hole 31 so that the treading device 12 can easily fit the mounting frame 30. It will be mounted in the mounting hole 31. Then, as shown in FIG.
5 is clamped by a locking piece 34 provided on a threaded rod 33 screwed to the mounting frame 30, whereby the treading device 12 is detachably fixed.

Next, a description will be given of the structure of a lifting control device for controlling the lifting and lowering of the stepping rod 20. The upper end of the treading rod 20 is attached to the mounting plate 3 fixed to the mounting frame 30.
5 is connected to an elevating motor 24 composed of a stepping motor mounted on the motor 5. That is, the drive shaft 25 of the elevating motor 24 is connected to the upper end of the screw rod 27 vertically supported by the bearing 26 by the coupler 36. The male screw formed below the screw rod 27 has a lifting rod 2
8 is screwed, and a projection 29 projecting from the lower end of the elevating rod 28 has a treading rod 20 in the operation hole 16 of the mounting plate 15.
Is contacted by the urging force of the ridge 17. The elevating rod 28 is inserted into a groove of a guide frame 37 having an upper end fixed to the mounting plate 35, and is flattened on both sides so that it cannot rotate.

[0015] In Thus, the elevating motor 24 rotates the screw rod 27 is driven, the lifting rod 28 by the screwing action will lift in the guide frame 37, by its downward movement, the pressing member 21 the projection 29 , The pressing member 21 is lowered against the ridge 17, and the lower surface of the pressing member 21 is pressed against the inner surface of the pad member 22. In addition, the elevating amount per one rotation of the elevating motor 24 is about 0.2 mm, and a minute elevating control is possible.

To release the link between the screw rod 27 of the elevating rod 28 and the treading rod 20, the elevating motor 24 is rotated so that the projection 29 of the elevating rod 28 is inserted into the operation hole 16 of the mounting plate 15. When it is lifted until it comes out, the locking flange 20a of the treading rod 20 is raised and held to a position where the mounting plate 15 is elastically contacted by the action of the ridge 17, so that the linkage between the lifting motor 24 and the treading rod 20 is established. Is released, and the treading device 12 is loosened by loosening the screw rod 33 so that the fitting hole 31
From the side. Similarly, in order to assemble the treading device 12, the procedure may be reversed. Since the attachment and detachment of the treading device 12 to and from the mounting frame 30 are easily performed, maintenance of the treading device 12 such as replacement of the wear-resistant cloth 23 can be easily performed. Prior to this exchange, the pad exchange switch SW ₃ connected to the central control unit CPU.
The by-one, by reverse driving the elevating motor 24 until the proximity switch SW ₁ is turned on for the upper limit specified to be described later, saving control described above of the lifting rod 28 is made easily.

The drive control of the elevating motor 24 is performed by an elevating control unit including a central control unit CPU as described later. The protruded detection rod t laterally on the lifting rod 28, the proximity switch SW 0 for determining further said mounting frame proximity switch SW 1 of 30 for the upper limit specified fixed to _side, the reference _point for lower limit specified Proximity switch SW
₂ are sequentially arranged from above. Then, the edge of the detection rod t is detected, and the proximity switches SW ₁ and SW ₂ are detected.
In this case, the ascending and descending drive of the elevating motor 24 is stopped. Also in the proximity switch SW _0, the pressing member 2
1 and a stepless measuring cylinder L to be described later.
And the reference point. Furthermore, when turning off the power of the belt sander machine, lift motor 24 is so driven stopped with the detection rod t lifting lever 28 rises and was turned on proximity switch SW ₁ for upper limit specified.

Next, a description will be given of a configuration of a work material detector for generating width direction row data with thickness information of a control work material w for issuing a control command of a lift control device including the lift motor 24 and the like. Such a work material detector is constituted by a stepless measurement cylinder L and a detection roll 43,
The same number as the pressing members 21 are arranged in the width direction corresponding to the front and rear of the pressing members 21.

As shown in FIG. 5, the stepless measuring cylinder L has a piston p slidably mounted in a cylinder c and a measuring rod r having one end connected to the piston p. c and the piston p
Air chambers 38a and 38b are formed above and below the air chamber 3a.
Pressurized air flows through the air flow holes 39a and 39b through the air flow holes 8a and 38b to urge the measurement rod r in the extending direction. A bar code 40 is formed in the measurement rod r in the axial direction, and the sensor 41 mounted on the cylinder body c detects passage of each bar of the bar code 40. The position information of the measuring rod r (thickness information of the workpiece w) converted into an electric signal by the sensor 41 is input to the central control unit CPU via a lead wire 42. The position information of the measurement rod r can be read directly by the digital display D connected to the sensor 41, thereby facilitating the position adjustment of the measurement rod r.

On the other hand, the tip of the measuring rod r abuts on a bearing piece 45 of a detection roll 43 rotatably supported by a support shaft 44 fixed to the body frame 1 side. The detection roll 43 is pressed against the upper surface of the supplied workpiece w by the downward urging force of the measurement rod r, and moves up and down with the variation in the thickness of the workpiece w. Ascending and descending, the barcode 40 passes in front of the sensor 41,
The amount of elevation is detected and transmitted to the central control unit CPU as thickness information. Further, the support shaft 44
A plurality of detection rolls 43 are supported corresponding to the pressing member 21 in front and back, and stepless measurement cylinders L are respectively disposed above the detection rolls 43. Therefore, this information is stored in the width direction with thickness information. It becomes column data.

Next, a control mechanism of the lift motor 24 by the central control unit CPU will be described. Central control unit CP
As shown in FIG. 6, a sensor k, a counter C for sequentially counting pulses from the sensor k, and a register R are connected to U, as shown in FIG. Switching control of the elevating motor 24 is performed.

That is, the width direction row data D is input from the plurality of stepless measurement cylinders L to the central controller CPU every time the counter C counts. Then, 1 is added to the count value of the counter C by the generation of the pulse signal from the sensor k, and when the count value reaches the count value ct stored in the register R, the lift motor 2
4 is performed. Note that this count target value ct
Corresponds to the distance from the stepless measuring cylinder L to the pressing member 21. Then, the thickness information generated from the stepless measuring cylinder L is sequentially input to the storage device RAM, and the count target value ct is digested, that is, the workpiece w
The drive control command corresponding to the thickness information is sent to the elevating motor 24 in synchronization with the arrival of the
From the workpiece w or the running of the workpiece w in synchronization with the accumulation of a predetermined number of pulse signals.
The pressing member 2 is driven by the drive of the lifting motor 24.
1 moves up and down by the same amount of elevation as the measurement rod r of the stepless measurement cylinder L. Therefore, the treading device 12
By preliminarily setting the difference in height between the tread surface and the lower edge of the detection roll 43 and determining the respective reference points,
The surface of the work material w is always subjected to the tread pressure caused by the difference in height by the treading device 12 even if the thickness of the work material changes, and substantially equal polishing is performed over the entire surface of the work material w. You will get.

Incidentally, the difference in the set height is caused by the stepping device 12.
Tread surface, for example, 0.4 mm from the lower edge of the detection roll 43
About below. Here, the reference point of the pressing member 21 is
As already mentioned, it is determined by the proximity switch SW _0. That is, at the position where the proximity switch SW ₀ detects the detection rod t, the treading surface of the treading device 12 is set with reference to a fixed point such as the lower edge of the driving roll 9. To adjust the drive roll 9
The height with respect to the tread surface of the treading device 12 is set to about 0.4 mm based on the lower edge or the like, and this may be set to zero. The reference position is slightly lower than the reference height of the workpiece w so that when the tip of the workpiece w passes, the measuring rod r is surely raised and the workpiece w is detected. Is set to

Therefore, the upper surface of the work material w may be warped,
Even if there are minute irregularities, a substantially uniform stepping force acts on the surface, and the work material w is subjected to reasonable grinding and polishing by the sanding belt 11.

In the above configuration, an air bag that is long in the width direction may be interposed between each pressing member 21 and the pad member 22. The air bag and the pad member 22 can be provided one by one for each pressing member 21. After all, the pressing member 21 is grasped as having a function of stepping on the endless sanding belt 11 indirectly or directly, and various stepping members can be interposed between the endless sanding belt 11 and the pressing member 21.

The present invention can be similarly applied to a wide belt sander having a plurality of grinding heads.

[0027]

According to the present invention, as described above, the lifting member screwed to the drive shaft of the lifting motor controls the lifting member provided at the lower end of the pressing rod provided in the pressing device. Therefore, the treading device is unitized, and by simply retracting the elevating rod to the upper position, the treading device can be easily detached from the mounting frame.
There is an excellent effect that the assembling and maintenance of the treading device become easy.

[Brief description of the drawings]

FIG. 1 is a front view of a wide belt sander machine.

FIG. 2 is a longitudinal sectional side view of a part of a state where the treading device 12 is assembled.

FIG. 3 is a vertical sectional front view showing a state where the stepping device 12 is assembled.

FIG. 4 is a vertical sectional front view showing a state in which the treading device 12 is separated.

FIG. 5 is a partially cutaway front view of a stepless measurement cylinder L.

FIG. 6 is a block diagram showing a control mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Sanding belt 12 Treading device 13 Treading frame 14 Sliding groove 15 Mounting plate 16 Operation hole 17 Trigger 18 Pad mounting groove 20 Treading rod 24 Elevating motor 28 Elevating rod 29 Projection 30 Mounting frame 31 Fitting hole L Stepless measuring cylinder CPU Central Control device

Claims (1)

(57) [Claims] An endless sanding belt is wound around a belt driving mechanism, and a stepping device having a large number of pressing members arranged in the width direction of a material feeding passage is arranged inside the endless sanding belt. One or more grinding heads configured to press the endless sanding belt against the work material by the pressing member are provided opposite the material feeding device via the material feeding passage, and in front of the treading device, A wide number of processing material detectors corresponding to the pressing members are arranged in a row in the width direction, and the lifting and lowering control of each pressing member of the treading device is performed based on the width direction row data from the processing material detector group. In a belt sander machine, a mounting plate in which a large number of vertical sliding grooves that open downward and are arranged in the width direction, and an operation hole that communicates with the sliding grooves is formed at an upper edge thereof. Is fixed A number of treads which are mounted on each sliding groove so as to be able to ascend and descend, with a locking flange formed on the outer periphery of the frame and having an upper end inserted into an operation hole of the mounting plate and a lower end fixed with a pressing member. A bar, a spring attached around the treading rod in the sliding groove, and an upper end thereof elastically contacting the locking flange to urge the treading rod upward, and further indirectly or directly cover each pressing member. A wear-resistant cloth fixed to the treading frame to be fixed to the sanding frame, arranged on the material feeding path side, and having a fitting hole of a lower opening with a wide locking groove edge on an upper edge, The upper portion of the treading frame is fitted into the fitting hole, and the mounting plate fixed to the upper edge of the treading frame is locked by the locking groove edge, so that the treading device can be detached to the side so as to be vertically suspended. A mounting frame for holding the treading rods immediately above the mounting frame. A plurality of elevating motors are disposed, and an elevating rod is screwed into the drive shaft thereof, so that the elevating rod is steplessly controlled by a screwing action accompanying the rotation of the drive shaft, and the elevating rod is controlled. A wide-belt sanding machine, comprising a lifting control device configured such that a lower end of the rod contacts an upper end of the stepping rod.