DE3018430A1 - GRINDING MACHINE - Google Patents

Description

description

The invention relates to a grinding machine in which the emery belt runs endlessly over three rollers, which according to FIG are arranged in an imaginary triangle, with the underside forming the zone of the abrasive belt that is in contact with is brought to the workpieces to be ground, which arrive in this zone via a transport device. The order can execute alternative movements in the vertical direction by means of suitable construction measures in order to reduce the distance between the active zone of the grinding belt and the workpiece regulate.

One object of the invention is to provide a grinding machine to train this type in such a way that the emery belt acts on the workpieces to be ground according to contact zones, which ever are variable according to the material properties.

Another task is to be able to regulate the tension of the drive belt by hand.

The first object is achieved in that above the contact zone of the emery belt with the workpieces an additional role is arranged, which a curvature of the emery belt in Direction on the workpiece causes.

To achieve the second object, the invention provides that a pulley for a drive belt is provided on the output shaft of the drive motor, which has another Belt pulley rotates, which is applied to one of the lower outer rollers, which is parallel to the transport device of the grinding workpieces are attached.

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Both pulleys each consist of a fixed and a movable pulley which, when joined, form the V-belt grooves.

This structure enables the V-belt groove of the pulley to change in width, for which purpose only the corresponding mechanical device is operated, the the movable disk approaches or moves away from the fixed disk. This shifts the moving discs automatically increase or decrease the diameter of the pulleys to which the drive belt attaches adjusts, in the first case a voltage and in the second relaxation is caused without the need to change the distance between the centers of the pulleys.

The invention will then be based on the accompanying drawings are explained in more detail. In these show:

Fig. 1 is an illustrative end elevation of the grinding machine the inventive solution to the first task;

FIG. 2 shows a schematic front elevation of a modified embodiment of FIG. 1;

Fig. 3 is a side sectional view of the two pulleys and the tensioning device of the over this revolving drive belt.

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301843Q

As can be seen, the emery belt (1) runs endlessly over three Rolls (2, 3, 4) around, two of which (3, 4) parallel to the conveyor belt (5) of the workpieces to be ground are arranged. The device can perform vertical movements around the To bring the contact zone (6) of the emery belt (1) closer to the workpieces to be ground or to remove them from them.

There is a belt pulley on the output shaft of the drive motor (7) (8) provided for a drive belt (9) which runs over the belt pulley (10). This pulley (10) is attached to the driven roller (3), which transmits its movement to the emery belt (1), which over the rollers (2, 3, 4) revolves as well as over the roller (13), which the contact zone (6) of the emery belt (1) in the direction of the to be ground and arches workpieces fed by the conveyor belt (5).

In the modified embodiment according to FIG. 2, in that the emery belt (1) is moved e.g. by the driven upper roller (2), the roller (13) is in a structure of four rollers incorporated, which are arranged at the end of the arms of a frame (16) which is concentric about its axis (17) is rotatable. The rotations of the frame (16) make it possible to choose one of the four rollers in the contact zone (6) of the Bring emery belt (1).

It is provided that each of the four roles has a different one Has surface texture to enable various work results. For example, the role (13) with a semi-hard, the roller (18) with a hard, the roller (19) with a soft and the roller (20) with a semi-soft surface.

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301843Q

From Fig. 3 it can be seen that a conical socket (23) is placed on the motor shaft (upper part), which in a further socket is added, which in turn is firmly connected to the fixed disc (21). On this disc (21) on the opposite side, the outer bushing has serration (22) which meshes with a corresponding serration on the central bore of the movable disc (8).

The movable disc (8) has stops (26) on the outside which engage in the circumferential channel of a nut (25), which are screwed into a ring (24) fastened to the conical bushing (23) by means of screws.

When turning the nut (25) on the ring (24) in the case of Reduction of the V-belt groove between the pulleys (8, 21) for the drive belt (9) is the movable pulley (8) in the indicated arrow direction taken in the direction of the fixed disc (21), the displacement by the aforementioned Serrations is performed. This will make the diameter the pulley is enlarged and thus the drive belt (9) is tensioned.

If the nut (25) is operated in the opposite direction, the movable disc (8) moves away from the fixed disc (21), and this reduces the diameter of the pulley and thus relaxes the drive belt (9).

The corresponding second pulley for the drive belt (9) (lower part of Fig. 3) has the same device to also to be able to change the width of the V-belt groove for the drive belt (9) on this side. The difference between this pulley and the one on the engine is that the

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movable disc on the opposite side of the disc (8) is arranged. This is therefore necessary so that the drive belt (9) is always in the axial direction of rotation of both pulleys.

The advantages of the grinding machine according to the invention over the state of the art can be summarized as follows:

1, The tension of the drive belt has previously required complicated ones and devices that are very susceptible to failure. In contrast, the change in tension of the drive belt according to the invention Solution carried out by hand with the machine switched off, by operating the nuts on the two pulleys to thereby change the space between the discs of the same. In this way, the

; Desired tension of the drive belt between the pulleys can be set.

2. In the known grinding machines, the contact zone has a fixed contact point with the workpiece to be ground, which is exposed to high frictional forces. Against it this contact zone is according to the invention by the fourth Roll (13) formed with the one by the drive belt (9) mediated speed rotates.

In the embodiment according to FIG. 2, they run on the frame (16) fixed rollers freely so that the frictional forces of the known devices are avoided here as well.

Finally, it should be pointed out that the diameter of the rollers arranged according to the invention is selected depending on the application is, whereby the vertical lifting option can be provided depending on the machine type. The invention is applicable to SchMfmaschinen with one or more work positions as well on edge grinding machines etc.

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Claims (3)

Claims Γ 1 grinding machine in which the sanding belt runs around endlessly about ^ three rollers, two of which are parallel to the conveyor belt for the workpieces arranged to be _ground,!; > the arrangement being movable in a vertical plane in order to regulate the distance between the contact zone of the emery belt and the work pieces, characterized in that on the output shaft of the drive motor (7) a pulley (8) for a drive belt , r (.9) is provided, which rotates over another belt pulley _r ClO), which is connected to one of the -: - ■ the roller (3) is attached to the plane of the workpieces, the diameter of these pulleys being variable is, and that a fourth roller (13) is provided, whose Diameter is a curvature of the contact zone (6) of the emery belt Cl) in the direction of the workpiece to be ground. •• 9 - -, - 13 0 0 37/0576 ORIGINAL 301843Q, submitted later] 2. Grinding machine according to claim 1, characterized in that at the ends of the arms of a cross-shaped frame (16) which is rotatable about its axis (17), four rollers (13, 18, 19, 20) with different surface properties are arranged are, which can optionally be brought into the contact zone (6) of the emery belt (1). 3. Grinding machine according to claim 1 and 2, characterized in that a conical bushing (23) is placed on the motor shaft, which is received in a further bushing which in turn is firmly connected to the fixed disc (21), the outer bushing has on the outside a serration (22) which meshes with a corresponding serration on the central bore of the movable disc (8), which has stops (26) on the outside which engage in the circumferential channel of a nut (25) which is attached to a screw on the conical sleeve (23) attached ring (2 4) is screwed. - End of claims - 130 037/0576