JPH0451305B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a diagonal band type belt sander in which an endless sanding belt is stretched over a material feeding device in a diagonal direction with respect to the material feeding direction.

Problems to be Solved by the Prior Art and the Invention A diagonal band type belt sander in which an endless sanding belt is stretched over a material feeding device in a diagonal direction with respect to the material feeding direction, The sanding belt has the advantage of being narrow and producing a large abrasive force, and generally presses the sanding belt against the workpiece using a narrow pressure pad placed approximately perpendicular to the direction of material feeding. This makes it easier to discharge chips during polishing and prevents clogging of the sanding belt.

By the way, in a diagonal band type belt sander with such a structure, the width of the sanding belt is set according to the maximum width of the workpiece to be sanded. In this case, only one side of the sanding belt in the width direction is pressed against the workpiece and participates in the grinding, causing only that part to become clogged, and then a wide workpiece is sanded. In some cases, the degree of clogging differs in the width direction of the sanding belt, making it impossible to perform uniform sanding.
Since only one side of the sanding belt in the width direction was frequently used, there was a problem with the sanding belt progressing and the service life being shortened.

The present invention has been completed in view of the above-mentioned points, and even if the width of the workpiece material changes, the sanding belt is always used over its entire width, and the degree of clogging and spillage can be reduced. To provide a diagonal band type belt sander which prevents uneven sanding by uniformly covering the entire width and greatly extends the service life of a sanding belt.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings.

In the figure, the main body frame 1 has a horizontal material feeding surface 3 for the workpiece X at the center of the lower end, and
A material feeding table 2 with positioning parts 4, 4 protruding from its left and right sides is supported by four screw rods 5, and can be raised and lowered by rotating a handle 6. An endless material conveying belt 9 is stretched between the supported drive roller 7 and tension roller 8, and the drive roller 7 and belt 11
The driving force of the drive motor 10 connected to the drive motor 10 causes the motor to circulate in the direction of the arrow.

Above the material feeding table 2, on one side thereof, there is a drive roller 15 connected to the output shaft of a drive motor 13 by a belt 14, and on the other side, a drive roller 15 is connected.
Cylinder frame 17 fixed to main body frame 1
The tension roller 20 is attached to a bracket 19 fixed to the tip of the piston rod 18, and the intermediate roller 22 is attached to a bracket 21 protruding from the cylinder frame 17 diagonally below the tension roller 20 with respect to the material feeding direction. The rollers 15, 20, and 22 are supported so that they can rotate freely around an obliquely inclined horizontal axis.
An endless sanding belt 24 having a width narrower than the lengths of 5, 20 and 22 is stretched around the sanding belt 24, and is configured to circulate in the direction of the arrow in an oblique direction inclined at an angle of about 80 degrees with respect to the material feeding direction. .

Inside the horizontal running section on the lower side of the sanding belt 24, an elevating frame 26 having a C-shaped groove 27 with an open bottom surface is disposed in a direction perpendicular to the material feeding direction, and is fixed to the main body frame 1 on its upper surface. A piston rod 29 of a downward-facing air cylinder 28 is fixedly installed and supported to move up and down freely, an air bag 31 is installed in the C-shaped groove 27, and a number of thin steel members are connected to each other on a thin rubber plate on the underside of the air bag 31. Flexible band plates 32 are fixed in parallel with a gap between them, and the right end portions thereof are aligned with the positioning portion 4 on the right side edge of the workpiece X, so that they cannot escape downward.

On one side of the lifting frame 26, a drive shaft 34 is rotatably supported, the rearward protruding portion of the main body frame 1 being connected to the output shaft of a drive motor 36 via a coupling 35, and a drive gear is attached to the tip of the drive shaft 34. 37 is fixed, and a driven pulley 38 is rotatably supported on the other side by a shaft 39. Between the drive gear 37 and the driven pulley 38, there is a toothed belt 41 on the drive gear 37 side. An endless belt 40, which is connected to the driven pulley 38 side with a rubber belt 42 corresponding thereto, is stretched in a direction perpendicular to the material feeding direction, and its lower running portion supports the band plate 32 described above. Along with this endless belt 4
A band-shaped insert 44 of a certain length made of sponge rubber having elasticity and flexibility is fixed to the outer surface of the rubber belt 42 of No. 0. A band-shaped wear-resistant cloth 45 is stretched with both ends fixed to left and right fixing members 46, 46.

Above the cylinder frame 17 described above, a mounting arm 48 is provided to protrude forward from the main body frame 1, and a light emitting element 50 is mounted at the tip of the mounting arm 48, and a light receiving element 51 is mounted on the cylinder frame 17. It is attached so as to sandwich the upper horizontal running surface of the sanding belt 24 on the straight line A connecting the driving roller 15 of the sanding belt 24 and one edge of the tension roller 20, and the light emitting element 50 and the light receiving element 51 A fixed detection device 52 for detecting one side edge 24a of the sanding belt 24 is configured, and a fixed detection device 52 for detecting the other side edge 24b of the sanding belt 24 is provided on the right side of the fixed detection device 52. A light emitting element 54 and a light receiving element 5 forming a movement detection device 53 for
A moving frame 5 is also attached to sandwich the upper horizontal running surface of the sanding belt 24.
7 is supported so as to be freely movable in the front and back direction along guide rods 58, 58, and one end of a transmission shaft 61 that extends across the main body frame 1 is attached to a rack arm 60 that projects from the rear surface of the movable frame 57. The pinion 62 at the other end is engaged with the bevel gear 63 at the other end.
is meshed with a bevel gear 65 fixed to the intermediate shaft 64, and a chain 68 is stretched between a sprocket 66 fixed to the intermediate shaft 64 and a sprocket 67 fixed to the drive shaft 34 of the endless belt 40 described above. The endless belt 40 is driven by the motor 36 in the forward direction or the reverse direction to move and adjust the tip of the insert 44 to match the left edge of the workpiece X, and the movement detection device 53 is adjusted to move forward or backward, and as shown in FIG. 1, the left side of the workpiece A straight line C passing through the intersection P of the edge and the front side edge of the insert 44
The distance is set to match the distance between the straight line A passing through the fixed detection device 52 described above and the straight line D passing through the intersection Q of the right edge of the workpiece X and the rear side edge of the insert 44. has been done. Further, the sanding belt 24 is formed so that its width matches the distance between the straight lines A and D described above.

An upward air cylinder 70 for steering is fixedly installed on the front surface of the cylinder frame 17, and when its control device receives a signal from the movement detection device 53, the piston rod 71 extends, and conversely, when the control device receives a signal from the movement detection device 53, the piston rod 71 extends. When receiving a signal from the piston rod 71
A steering rod 73 whose base end is fixed to a bracket 19 which pivotally supports the tension roller 20 described above is inserted into a fitting groove 72 provided around the tip of the piston rod 71. The tip end is fitted, and as shown in FIG. 4, the air cylinder 70
The tension roller 20 swings about the axis of the piston rod 18 fixed to the bracket 19 as the tension roller 20 expands and contracts.

In addition, the left and right positioning parts 4 of the material feeding table 2,
A pair of light-emitting elements 75 and a light-receiving element 76 that constitute a photoelectric switch for detecting passage of the front end and rear end of the workpiece X are attached to the drive motor 4 for the material conveying belt 3. An encoder 80 for calculating the moving distance of the material conveying belt 3 is connected to the output shaft of the photoelectric switch 10 via a chain 78 and a sprocket 79.
Air cylinder 2 that drives the lifting frame 26 up and down
8 control devices.

Next, the operation of this embodiment will be explained.

First, the workpiece X is placed on the material feeding belt 9 with its right side edge against the positioning part 4, and then the drive motor 3
6 to rotate the drive gear 37 in the clockwise direction in FIG. 2 and cause the endless belt 40 to run in the same direction. When it enters between the wear-resistant cloths 45 and aligns its tip with the left edge of the workpiece X, the moving frame 57 moves forward in conjunction with this, and the movement detection device 53 detects the and insert 44
The distance from the straight line C passing through the intersection P of the front side edges of is,
It is aligned on a straight line B that is equal to the distance between the straight line A passing through the fixed detection device 52 and the straight line D passing through the intersection Q of the right edge of the workpiece X and the rear side edge of the insert 44.

Then, the material feeding table 2 is raised to lift the workpiece X to a certain height, and the air bag 31
When the lifting frame 26 equipped with the sanding belt 26 is lowered, the sanding belt 24 is pressed against the upper surface of the workpiece X via the insert 44, and the workpiece X is polished as it moves forward. However,
Now, as shown in Figure 1, sanding belt 2
When the front side edge 24a of 4 is aligned with the straight line C and the rear side edge 24b is aligned with the straight line B, and this is detected by the movement detection device 53, the steering air cylinder 7
0 extends, the tension roller 20 swings to an oblique position with its front side tilted upwards about the axis of the piston rod 18, and the sanding belt 24
By increasing the tension on the front side edge 24a of
The sanding belt 24 slides on the sanding belt 24 and gradually moves toward the front side, and the rear side edge 24b of the sanding belt 24 aligns with the straight line D, and the front side edge 24a aligns with the straight line A, and this is detected by the fixed detection device 52. and air cylinder 7
0 contracts, the tension roller 20 swings to an oblique position with its front side tilted downward, and the tension on the rear side edge 24b of the sanding belt 24 increases, causing the sanding belt 24 to tighten. ding belt 24
The sanding belt 24 gradually moves toward the rear side, and the above-mentioned operation is repeated, and the sanding belt 24 reciprocates in the width direction between the straight line A and the straight line B and runs in circulation, and the sanding belt 24 moves across its entire width. It is pressed against the workpiece X over a period of time.

Note that if the width of the workpiece X is wider than that of the above embodiment, the movement detection device 53 moves forward as the insert 44 advances further, and the amount of movement of the sanding belt 24 in the width direction increases. On the contrary,
If the width of the workpiece X is narrow, the movement detection device 53 moves backward, and the amount of movement of the sanding belt 24 becomes large, so that no matter what width the workpiece X is, the sanding belt 24 always covers its entire width. and is pressed against the workpiece X.

Also, the tip of the insert 44 should be aligned with the left edge of the workpiece As a result, the sanding belt 24 is pressed in a range that exactly matches the width of the workpiece X, so that the left and right side edges of the workpiece X are prevented from sagging.

Furthermore, regarding the end sag at both the front and rear ends of the workpiece When the rear edge of the workpiece This is prevented by raising the elevating frame 26 when the polishing reaches just below the polishing point 44 and finishing the polishing.

In addition, in the above embodiment, the fixed detection device 5
2 and the movement detection device 53 are photoelectric switch types, but they may also be configured with a pressure air sensing switch, an ultrasonic sensor, or the like.

Furthermore, the moving frame 5 is equipped with a drive gear 37 for driving the endless belt 40 and a movement detection device 53.
The drive shaft 34 for driving 7 may be manually driven.

Further, the present invention is not limited to a type in which the workpiece X is fed by the material feeding belt 9, but can also be applied to a type in which the material is fed by a reciprocating table.

Structure and Effects of the Invention As specifically explained in the above embodiments,
The diagonal band type belt sander of the present invention has an endless sanding belt stretched over a group of rollers above the material feeding device in a diagonal direction with respect to the feeding direction of the workpiece material. A diagonal band type belt in which a narrow treading device for pressing the sanding belt against the workpiece is provided in a direction substantially perpendicular to the material feeding direction inside a portion of the belt that runs opposite to the material feeding device. In the sander, the fixed detection device that detects the position of one side edge of the sanding belt is in a fixed position, and the movement detection device that detects the position of the other side edge is freely adjustable according to the width of the workpiece. A steering device is provided on any one of the rollers of the roller group, and the steering device swings the roller in forward and reverse directions based on detection signals from the fixed detection device and the movement detection device. By swinging the rollers in the forward or reverse direction every time a signal is received from the fixed detection device or the movement detection device, the sanding belt slides on the roller group to adjust the width of the workpiece. The main feature of this system is that the sanding belt, which runs in circulation, is reciprocated in the width direction with an amount of movement corresponding to the width of the workpiece X. Because the pressure is always applied to the workpiece over the entire width, regardless of the width of the workpiece, the degree of clogging and spillage can be made uniform over the entire width, resulting in uniform polishing. In addition to being able to carry out processing, it is possible to prevent the sanding belt from wearing out on one side, and has the effect of significantly extending the useful life of the sanding belt.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of an embodiment of the present invention;
2 is a partially cutaway front view thereof, FIG. 3 is a partially cutaway side view thereof, and FIG. 4 is an aa line diagram of FIG. 1. 2: Material feeding table, 15: Drive roller, 19:
Bracket, 20: Tension roller, 22: Intermediate roller, 24: Sanding belt, 24a,
24b: Side edge (of sanding belt 24), 2
6: lifting frame, 31: air bag, 44: insert, 52: fixed detection device, 53: movement detection device,
70: Air cylinder, 71: Piston rod, 7
3: Steering rod, X: Workpiece material.

Claims (1)

[Scope of Claims] 1. An endless sanding belt stretched over a group of rollers is installed above the material feeding device in a diagonal direction with respect to the feeding direction of the workpiece material, and the sanding belt is In the diagonal band type belt sander, a narrow treading device for pressing the sanding belt against the workpiece is provided in a direction substantially perpendicular to the material feeding direction inside the part that runs opposite to the material device. A fixed detection device for detecting the position of one side edge of the sanding belt is provided at a fixed position, and a movement detection device for detecting the position of the other side edge is provided so as to be freely adjustable according to the width of the workpiece. A steering device is provided on any one roller of the roller group to swing the roller in forward and reverse directions based on detection signals from the fixed detection device and the movement detection device, and the steering device is configured to rotate the roller in the fixed detection device or the movement detection device. By swinging the rollers in the forward or reverse direction each time a signal is received from the movement detection device, the sanding belt slides on the roller group, and the amount of movement is determined according to the width of the workpiece. A diagonal band type belt sander characterized by having a configuration in which reciprocating motion is made in the width direction. 2. The treading device freely adjusts the amount of advancement from the side of the workpiece in a direction substantially perpendicular to the material feeding direction between a pressing body that applies a pressing force and the pressing body and the sanding belt. The diagonal band type according to claim 1, characterized in that the movement detecting device is configured to include an insert body to be inserted, and to adjust the movement of the movement detection device in accordance with the amount of advance of the insert body. Belt sander.