JP2535033B2 - Grinding or polishing machine - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention is a grinding or polishing machine, comprising a rigid clamping shaft for a tool, said clamping shaft via an elastic coupling member. Associated with a turntable for holding a tool, the pivoting of the turntable being adjustable by means of an axially displaceable sleeve of the clamping shaft.

Such grinding or polishing machines (Shleif-oder Polie
The rteller) is tightened in a chuck, such as a drilling machine, with a tightening shaft protruding from the plane in a direction substantially at right angles. As a result, the grinding or polishing machine is rotated, and the work is ground.

2. Description of the Related Art In the known grinding of this type, (Brasch-Ka
Talog, 197/77, serial number: 33938), the connecting member consists of a spherical hinge member attached to the lower end of the tightening shaft, which hinge member is a turntable (Platform).
It is rotatably received in all directions by the bearing receiving part provided in the tenteller), and this hinge member is
A radial projecting projection is provided which engages in an enlarged notch in the bearing receiving part to ensure rotational entrainment. A sleeve, in the form of a cylindrical bushing with a graduated step in diameter, is movably arranged on the clamping shaft, the sleeve engaging an upper cylindrical opening in the back wall fixed to the turntable. It can be moved against the force of the return spring until it fits and can be locked in this position by a bayonet connection. When the sleeve is engaged, the turntable is rigidly fixed to the clamping shaft, so that the grinding machine can perform edge grinding, for example. When the sleeve is uncoupled, the turntable can be swiveled in all directions, which is desirable, for example, in surface grinding. Known grinders are, of course, 1
It has only two limited turning characteristics and is "stiff"
It can only be adjusted to the extreme positions of both "bending" and "bending". Moreover, such a ball hinged coupling member is expensive to manufacture.

In the grinding machine known from DE 30 38 850 A1, the clamping shaft consists of a flexible shaft, which at its lower end directly supports the turntable, which Can bend in all directions while bending its axis. Since the sleeve is moved on the flexible tightening shaft and fixed to the threaded pin on the rear side of the turntable, the turntable can be mounted rigidly. The sleeve is clamped directly at the other end into the sig of the drive mechanism and then rests on the rigid clamping shaft. However, such a flexible shaft is at least strongly destroyed if the flexible shaft is given a great degree of swivel. Moreover, the use of the sleeve, which is only required on demand, is awkward to operate, without the risk of the sleeve being lost.

In the grinding machine known from DE 32 22 858 A1, the intermediate section of the tightening shaft that directly supports the turntable is formed as a flexible shaft member, the shaft sections being provided on both sides of this shaft member. Connected and these shaft sections are provided with external threads. A cap nut is guided in one of the thread sections and is pre-rotated until it also engages the second thread section of the clamping shaft to bridge the flexible shaft section. . Even with such a known configuration, the flexible shaft member is a component that is extremely easily broken.

In the flexible grinding machine known from DE-OS 3301210, a turntable carries a rigid rear sleeve which surrounds a clamping shaft, and The sleeve is provided on one side with a clamping shaft and on the other side with an elastic coupling member in the form of an elastomer cushioning member vulcanized to the sleeve. However, such an elastomer cushioning member is apt to be significantly broken at least when it has a large turning property. Furthermore, no rigid mounting of the bridge of the elastomer cushioning member and thus of the turntable is performed.

In the flexible grinder known from U.S. Pat.No. 2,629,990, the elastic linkage member is an elastomeric cushion vulcanized on one side to the clamping shaft and on the other side to the rear projection of the turntable. Made of parts. An elastomeric cushioning member is surrounded on its circumference by a rigid cap which reinforces the cushioning member as an outer strip. For the grinder,
A plurality of caps of various heights are provided and these caps are mounted depending on the degree of reinforcement desired. The vulcanized cushioning material here is also strongly worn or destroyed and the use of replaceable strip sleeves makes the operation cumbersome.

In the elastic grinding machine known from German Patent No. 3439230, FIGS. 1 and 2,
Again, an elastomer cushion is vulcanized on one side to the end flange of the tightening shaft and on the other side to the back of the turntable. To fix the turntable,
A cap surrounding the cushioning member is used when needed,
The cap has a thread at the lower end, by means of which the cap is screwed into the thread projection on the rear side of the turntable. Also in this case, the vulcanized cushioning member becomes an expensive component, and the operation of the reinforcing cap, which is mounted only when necessary, is troublesome. In the grinders shown in FIGS. 3 and 4, the turntable has a rigidly mounted rearwardly projecting sleeve which surrounds the clamping shaft. As an elastic coupling member, a vulcanized cylindrical elastomer cushioning member is provided on one side of the clamping shaft and on the other side of the sleeve. As a bridge member for the elastic coupling member, a nut guided on the threaded section of the clamping shaft is provided, which nut is clamped on the rear end of the sleeve. In this known design, the peripheral wall of the elastomeric cushioning member is always compressed between the clamping shaft and the sleeve during pivoting and is therefore highly demanding. Therefore, a correspondingly expensive elastomer cushion is needed.

OBJECT OF THE INVENTION The object of the invention is adjustable in a grinding or polishing machine of the type mentioned above over a wide angular range of the turntable. Extremely flexible swivel is obtained, and the grinding or polishing machine, especially its elastic connecting member,
To be superior by being made wear-resistant from simple individual parts that are simply screwed in at the time of assembly.

Means for Solving the Problems The measures taken to solve the above-mentioned problems are as follows: the connecting member is composed of a hinge disk, and the outer edge region of the hinge disk has a raised annular ridge of the turntable. And a cap-shaped flange having a conical connecting surface attached to the turntable, the axial distance between the connecting surface and the corresponding connecting surface provided on the sleeve is the turn distance. It is to define the turning angle of the table.

The advantages obtained by the present invention are that by using a relatively large hinge disc as the elastic connecting member,
A very high degree of flexibility for the turning of the turntable is to be obtained, in which case the hinged discs are to a large extent only acted upon during bending when turning, thus considerably preventing the risk of material fatigue. The turning angle of the turntable can now be adjusted over a wide range in relation to how close the conical connecting surfaces are to each other. When the connecting surfaces are completely abutted, the elastic connecting member is rigidly bridged. In addition, the grinding or polishing machine has the additional advantage that it can only be assembled from simple individual parts that are simply screwed together and is therefore cheap to manufacture.

Embodiment According to an advantageous embodiment of the invention, the hinge disc is made of spring steel, rubber or plastic. When using rubber- or plastic discs that are still compressed to a certain extent, the advantage is also obtained that, even when bridging the connecting members, a slight flexibility remains for the turntable. This improves quiet operation during edge grinding.

More advantageously, the hinge disc is reduced to a cross-shaped member, which consists of two crossed strips of spring steel or plastic.

It is advantageous if a sleeve with corresponding connecting surfaces is movably arranged on the clamping shaft itself.

Threads may be provided to connect the sleeve to the tightening shaft.

According to another aspect of the invention, the sleeve is supported on the clamping side of the cap-shaped flange via a compression spring, and a lateral pin fixed to the clamping shaft is selected on the rear side of the sleeve. A plurality of locking members distributed over the peripheral surface at various depths for active reception. This allows the sleeve to be adjusted in its axial position in a simple manner by axial movement and rotation against the spring force.

To facilitate the adjustment by this bayonet connection, each is raised toward a relatively shallow locking seat. A riding ramp for the transverse pin can be arranged.

According to another feature of the invention, the sleeve is designed as a clamping chuck and has a corresponding connecting surface at the end of the sleeve opposite the clamping jaws.

Also, instead of movably disposing the sleeve on the clamping shaft, a configuration is provided in which the sleeve is screwed into a cap-shaped flange.

EXAMPLE The grinding or polishing machine according to FIGS. 1 and 2 has a rigid clamping shaft 1 at the lower end of which a hinge disc in the form of a flat rubber or plastic disc 3 is provided. 2 is fixed and tightened by a head screw 4. Moreover, the disc 3 is held between the two disc springs 5,5, and the diameter of the disc spring, that is, the diameter of the displacement of the disc spring in contact with the disc, which is decisive for tightening the disc, is It is about 1/3 of the plate diameter.

The outer edge area of the disc 3 is fixed and clamped between the raised annular ridge 6 of the turntable 7 and the foot 8 of the cap-shaped flange 9 by means of four screws (not shown) distributed over the circumference. ing. The diameter of the disc 3 is almost the same as half the diameter of the turntable 7. The flange 9 is a roof-shaped recess that is upwardly drawn and has a conical shape.
10 has this opening which surrounds the clamping shaft 1 with considerable play, so that the turntable 7 swivels the disk 3 in all directions and with respect to the axis of the clamping shaft 1. It is possible.

A sleeve 12 is movably guided in the thread 11 of the tightening shaft 1, the lower end of the sleeve having a conical portion.
Formed as 13, the inclination of the cone conforms to the taper of the opening 10, so that the conical connecting surface 15 of the flange 96 is assigned to the corresponding corresponding connecting surface 14 of the sleeve 12. . In the position shown in FIG. 1,
The conical portion 13 is located axially above the conical opening 10, so that the turntable can be swiveled until at most the flange 9 abuts on the clamping shaft 11. Opening 10
When the conical portion 13 is partially screwed in, the turning degree of the turntable 7 is limited to a relatively small angle,
Moreover, it is possible to change the degree of turning without permission.
When the cone 13 has been screwed in until it has been connected, the flange 9 is rigidly fixed to the clamping shaft 1, so that the disc 3 is no longer bent. But in this case,
The turntable 7 can still swivel a small amount due to its axial compressibility in the outer clamping range of the disc 3.

As can be further seen from FIG. 1, the screw 4 abuts in the central area of the turntable 7 with a hemispherically formed head 16 as a swivel bearing, and by this the quiet operation of the turntable. To improve. The turntable 7 holds a rubber stand 7 and a holding plate 18 for the grinding or polishing machine. Furthermore, the flange 9 has a downwardly projecting bushing 9a surrounding the clamping shaft with play, which bushing 9a is a stopper for maximally lifting the hinge disc 2 when clamping the sleeve 12. To form.

In the embodiment shown in FIGS. 3 to 5, the hinge disc 2 consists of a spring steel disc 19, which spring steel disc is
In the same manner as the embodiment shown in FIGS. 1 and 2, in the central area, it is fixedly fastened to the clamping shaft 1 and, in the edge area, between the turntable 7 and the cap-shaped flange 20 is elastic. Screw 45 with an intervening disc 44
Has been tightened by.

A sleeve 21 is movably and rotatably supported on the tightening shaft 1, and a bayonet-type locking device is arranged on the sleeve. Sleeve 21
Is supported by a rear end portion of the flange 20 having the stopper bush 20a via a compression spring 22, and abuts a lateral pin 23 penetrating the tightening shaft 1 on the rear surface side. On its rear side, the sleeve 21 has a plurality of locking seats 34, 25 distributed over its circumference in the form of diametrical slits of different depths for selectively receiving the transverse pins 23.
26 (see FIGS. 4 and 5). Locking seat 24
The sleeve in the fully disengaged position according to FIG.
The locking seat 25 serves to lock the sleeve 21, the locking seat 25 serves to establish an intermediate position, and the locking seat 26 serves to lock the sleeve in the most deeply engaged position. The adjustment is effected in each case by pressing the sleeve 21 against the force of the compression spring 22 and then rotating it, in which case a relatively shallow engagement between the locking seats 24, 25, 26, respectively. Ramp-up ramps 27, 28 for the lateral pins 23, sloping towards the seat.
29 are provided. The spring 22 can also be omitted and for this purpose a self-tightening seat of a sleeve 21, for example made of plastic, is provided on the shaft.

Instead of the round spring steel disc 19, it is also possible to use a hinge disc reduced to a cross-shaped member 30 as shown in FIG. 6, which cross-member is integrally formed or It may be formed from two intersecting strips 31, 32 of spring steel or plastic as shown.

Instead of the sleeves 12, 21 shown in FIGS. 1 and 3, it is also possible to use a sleeve 33 shown in FIG. 7, which sleeve 33 is movable on the clamping shaft 1. And the tightening shaft 1 with the fixed adjusting screw 34
It is fixed and tightened.

Another embodiment of the sleeve 35 is shown in FIG.
The sleeve consists of a clamping chuck arranged on the clamping shaft 46 by means of the associated clamping nut 30. The tightening jaw 37 faces the tightening end of the tightening shaft. The end face of the clamping chuck, which is located on the opposite side of the threaded shaft 38, is formed as a cone with a corresponding connecting surface 14. Tightening shaft 46 is sleeve 35
It has a hexagonal contour shape in the range of.

In the embodiment according to FIG. 9, the fixing adjustment member consists of a sleeve 41 screwed into the threaded opening 39 on the rear side of the flange 40, which sleeve 41 is connected to the lower end in a conical manner. It is provided with a surface 42, which is associated with a corresponding mating connecting surface 43 on the clamping shaft.

[Brief description of drawings]

1 is a vertical sectional view of the table for grinding or polishing according to the present invention taken along the line I-I of FIG. 2, FIG. 2 is a plan view, and FIG. 3 is a vertical sectional view showing a second embodiment. FIG. 4 is a plan view seen in the direction of arrow IV in FIG. 3, FIG. 5 is a development view of the locking seat portion provided on the sleeve shown in FIG. 4, and FIG. 6 is a grinding machine according to the present invention. Top views showing alternative embodiments of the hinge disc, FIGS. 7, 8 and 9 are longitudinal sectional views showing three embodiments of the adjustable sleeve. 1 ... Tightening shaft, 2 ... Hinge disk, 3 ... Disk, 4 ... Head screw, 5 ... Belleville spring, 6 ... Annular ridge, 7 ... Turntable, 8 ... Foot , 9 ... Flange, 9a ... Bush, 10 ... Opening, 11 ... Thread, 12
...... Sleeve, 13 ...... Conical part, 14 ... Corresponding connecting surface, 15 ...
… Connecting surface, 16 …… Head, 17 …… Rubber base, 18 …… Holding plate, 19 …… Spring steel disk, 20 …… Flange, 20a ……
Stopper bush, 21 …… Sleeve, 22 …… Compression spring, 23
...... Horizontal pins, 24,25,26 …… Locking seats, 27,28,29 …… Riding ramps, 30 …… Cross-shaped members, 31,32 …… Bands, 33 ……
Sleeve, 34 …… Fixed adjusting screw, 35 …… Sleeve, 36…
… Tightening nut, 37 …… Tightening jaw, 38 …… Threaded shaft, 39 …… Threaded opening, 40 …… Flange, 41 …… Sleeve, 42 …… Connecting surface, 43 …… Corresponding connecting surface, 44 …… Disc, 45 …… screw, 46 …… tightening shaft

Claims (10)

(57) [Claims] 1. A grinding or polishing machine comprising a rigid clamping shaft for a tool, said clamping shaft being coupled with a turntable for holding the tool via an elastic coupling member. In the type in which the turning of the turntable is adjustable by the axially adjustable sleeve of the tightening shaft,
Said connecting member consists of a hinge disc (2), the outer edge region of said hinge disc being attached to the raised annular ridge (6) of the turntable (7) and to the turntable (7). And a cap-shaped flange (9,20,40) having a conical connecting surface (15,42), the connecting surface (15,42) and the sleeve (12,21, 33,35)
Grinding or polishing machine, characterized in that the axial distance from the corresponding connecting surface (14, 43) provided on the stipulates the turning angle of the turntable (7). 2. Grinding or polishing machine according to claim 1, characterized in that the hinge disk (2) is made of spring steel, rubber or plastic. 3. Grinding or polishing machine according to claim 1 or 2, wherein the hinge disc (2) is reduced to a cross-shaped member (30). 4. Grinding or polishing machine according to claim 3, characterized in that the cross-shaped member (30) consists of two crossed strips (31, 32) made of spring steel or plastic. 5. Grinding or polishing machine according to claim 1, characterized in that the sleeves (12, 21, 33, 35) are movably arranged on the clamping shaft (1). 6. Grinding or polishing machine according to claim 5, characterized in that the sleeve (12) is connected to the tightening shaft (1) by means of a thread (11). 7. A sleeve (21) is supported on the tightening side of a cap-shaped flange (20) via a compression spring (22), and is fixed to the tightening shaft (1) on the back side of the sleeve. A plurality of locking seats (24, 25, 26) distributed over the peripheral surface of different depths for selectively receiving the lateral pins (23) to be secured. The grinding or polishing machine according to item 5. 8. A ride-on ramp (27,28,29) for a lateral pin (23) which rises in the sleeve (21) towards a relatively shallow locking seat (24,25,26) respectively. ) Is disposed, the grinding or polishing machine according to claim 7. 9. The sleeve (35) is formed as a clamping chuck and has a corresponding connecting surface (14) at the end of the sleeve opposite the clamping jaws (37). The grinding or polishing machine according to the item 7. 10. Grinding or polishing machine according to any one of claims 1 to 4, characterized in that the sleeve (41) is screwed into the cap-shaped flange (40).