JPS6055263B2 - Belt grinding device with contact wheel load control - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a belt grinding device that controls the amount of grinding of a workpiece by controlling the load of a contact wheel.

Conventionally, the contact wheel of a belt grinding device has typically been operatively connected to a motor for driving the belt, or has been operatively connected to a tension device that applies tension to the abrasive belt.

Shikasho, ^ 1--j, Peyu-yo, ^, ι Todoroi
−ーー ι ゛ −*, LUι, 1・−
- When moving, the entire device must be moved in order to generate a pressure load between the contact wheel and the workpiece and control the pressure load, and the static friction resistance during movement is large, resulting in a large loss of pressure load. There was a risk of errors occurring over time, and large-capacity motive power was required for movement. Therefore, the present invention solves the above-described drawbacks of the conventional device by moving only the contact wheel when generating the pressing load, and also provides a contact wheel for positioning the abrasive belt. It is an object of the present invention to provide a belt grinding device that can independently control the load of the contact wheel and the load of the contact wheel for generating the pressing load during grinding.

In order to achieve the above object, the present invention provides a drive device that drives an abrasive belt to run, a tension device that applies a predetermined tension to the belt, a contact wheel that brings the belt into contact with a workpiece, and an axis of the contact wheel. a lever capable of displacing the contact wheel toward the workpiece through the lever; and a rack that engages with a pinion that is interlocked with the knob.
A balance adjusting device is connected to the lever via a tension spring to position the contact wheel at a predetermined position against the tension of the belt, and a ball nut is screwed onto a ball screw rotationally driven by a motor. The pressurizing device is connected to the lever via two tension springs and presses the contact wheel against the workpiece with a predetermined pressing load.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a belt grinding device using contact wheel load control according to the present invention will be described below with reference to the drawings.

A drive device 4 consisting of a motor 2 and a drive pulley 3, and a contact wheel 5 are provided on a base plate 1 of the balance adjustment device shown in FIG. Endless abrasive belt 6
is hung. 7 is a tension device that applies a predetermined tension to the abrasive belt 6; 8 is a balance adjustment device that positions the contact wheel 5 at a predetermined position against the tension of the abrasive belt 6; and 9 is a tension device that applies a predetermined tension to the abrasive belt 6. 6 is a pressurizing device that presses a workpiece 10 with a predetermined pressing load.

FIG. 2 shows an enlarged view of the main parts on the base plate 1, and FIGS. 3 and 4 are plan views thereof.

As shown in FIGS. 2 to 4, the polishing belt 6 is run in the direction of arrow A by a drive device 4 (not shown) using guide pulleys 11, 12, and 13 as guides. Tension device 7
, by rotating the handle 14 in the direction of the arrow B, the guide pulley 1 and the river 5 that are interlocked with the handle 14 move in the direction of the arrow C.
direction, and thus a predetermined tension is applied to the abrasive belt 6. The contact wheel 5 consists of a suitable cylindrical body 16 and a hard rubber 17 fitted onto the cylindrical body 16, and is supported by a shaft 1 by a bearing 18.
It is attached around 9 so that it can rotate freely.

This shaft 19 is fitted into a recess of a boss 24 fixed to two upper and lower guide bars 23 that are slidable in bearings 21 and 22 fixed to a frame 20 provided on the base plate 1. . In addition, the guide bar 23 has a roller 2 at the center.
5. Therefore, if the communication bar 26 is moved so that the boss 24 moves in the direction of arrow F between the bearings 21 and 22 which also serve as stoppers, the contact wheel 5 The polishing belt 6 then moves toward or away from the workpiece 10, making it possible to obtain a predetermined amount of polishing. on the other hand,
A pressing surface 29a of a lever 29 that can swing around a shaft 28 supported by a bracket 27 fixed to the frame 20 is in contact with the roller 25 at the center of the communication bar 26. Rod 30 and rod 31 are tightened with nuts. The balance adjustment device 8 includes a pinion 33 linked to a knob 32 and a bracket 3 on the base plate 1.
The rack 36a is constructed integrally with a bar 36 that slidably passes through a bearing 35 provided in the rack 36a, and a rod 38 is tightened with a nut to a rod 37 that projects from the rack 36a. , a tension spring 39 is suspended between the rod 38 and the rod 30.

On the other hand, the pressurizing device 9 is rotatable by a DC servo motor 40 and a bearing 42 provided on a bracket 41 on the base plate 1, and is connected to a ball screw connected to a rotating shaft 43 of the motor 40 by a coupling 44. 45, and a frame 4 that is slidably fitted onto two guide bars 47 supported by brackets 46 provided on both sides of the bracket 41.
8, a nut block 50 having a ball nut 49 externally fitted onto the ball screw 45, a linear displacement meter 51 having a movable portion 51a fastened with a nut to the nut block 50, and a plate protruding from the nut block 50. 52 and a rod 53 tightened with a nut, and a tension spring 54 is hung between the rod 53 and the rod 31.

In the above configuration, with the abrasive belt 6 stopped running, the handle 14 is rotated in the direction of arrow B to move the guide pulley 15 in the direction of arrow C, thereby applying a predetermined tension to the abrasive belt 6.

Next, if the knob 32 is rotated in the direction of arrow D and the pinion 33 and rack 36a are moved so that the rod 38 pulls the spring 39, the rod 30 will also be pulled accordingly, and the force of the lever 29 will almost push the lever 25. Then, the boss 24, which had been pushed toward the bearing 21 by the tension of the abrasive belt 6 transmitted through the contact wheel 5, is moved to the bearing 21 side.
1 and the bearing 22, and the tension of the abrasive belt 6 and the position of the contact wheel 5 are properly balanced. It is assumed that the workpiece 10 is in light contact with the polishing belt 6 at this time. Subsequently, the workpiece 10 is fed in the direction of arrow E, and the abrasive belt 6 is caused to run in the direction of arrow A.

When grinding the workpiece 10, ■ the servo motor 40 is rotated to rotate the ball screw 45, and the nut block 5 is rotated.
If the lever 29 is moved so that the rod 53 pulls the spring 54, the rod 31 will also be pulled accordingly, and the lever 29 will further push the roller 25 from the above-mentioned balance position. Therefore, the contact wheel 5 and the abrasive belt 6 are pressed against the workpiece 10, and grinding is performed by this pressing load. At this time, the pressing load is D
It is controlled according to the rotation angle of the C servo motor 40,
Furthermore, a closed loop circuit is configured using the linear displacement meter 51 with a pressing load control system (not shown) to improve control accuracy. As described above, according to the present invention, since the pressing load is generated by moving only the contact wheel, it is possible not only to prevent the loss of the pressing load as much as possible and to prevent errors in the pressing load, but also to reduce the pressing power Moreover, the balance adjustment device and pressure device can be used to control the load on the contact wheel for positioning the abrasive belt and to control the load on the contact wheel for generating pressing load during grinding. and can be performed independently of each other.

[Brief explanation of the drawing]

The drawings show a belt grinding device using contact wheel load control according to the present invention; FIG. 1 is a front view thereof, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 shows a tension device and a balance adjustment device. FIG. 4 is a plan view illustrating the pressurizing device. 4... Drive device, 5... Contact wheel, 6.
... Abrasive belt, 7... Tension device, 8... Balance adjustment device, 9... Pressure device, 10... Workpiece.

Claims (1)

[Claims] 1. A drive device that drives an abrasive belt to run, a tension device that applies a predetermined tension to the belt, a contact wheel that brings the belt into contact with a workpiece, and a contact wheel that connects the contact wheel to the workpiece through the shaft of the contact wheel. a lever displaceable towards the lever, and a rack connected to said lever via a first tension spring, which engages a pinion coupled to a knob, and a balance for positioning the contact wheel in position against the tension of said belt. An adjusting device and a ball nut screwed into a ball screw rotationally driven by a motor are connected to the lever via a second tension spring,
A belt grinding device by controlling the load of a contact wheel, comprising: a pressurizing device for pressing the contact wheel against a workpiece with a predetermined pressing load.