DE1052264B - Feed drive for grinding slide - Google Patents

Description

With tool, z. B. grinding machines, the tool carrier slide z. B. to replace the Workpiece or the tool often employed or withdrawn from the workpiece will.

This infeed and retraction movement is expediently not carried out by means of the precise setting used micrometer spindle, since the process is too tedious because of the low pitch of the same and also causes wear on the spindle.

Feed drives with adjusting eccentrics combined with the micrometer spindle have therefore already been proposed which enables the infeed and retraction movements to be carried out without the aid of the micrometer spindle allow.

The invention aims to improve these last-mentioned infeed drives and increase their accuracy. she starts with an infeed drive for grinding slides with a spindle for setting the small spacing between the grinding wheel and workpiece axis and with one that acts directly on the spindle bearing and thus the eccentric system acting axially displaceably on the spindle including the slide that of the carriages with decreasing speed, d. H. first with urgent and then with less and less increasing fine feed speed can be brought up to the workpiece axis or after the end of the Operation can be removed from this again.

The inventive novelty consists in the fact that under a known design of the eccentric as an adjusting eccentric as well as the spindle bearing with the spindle nut attached to the carriage tiltable play-free on a slide and with a perpendicular to the spindle and parallel to the slide guide Axis is articulated and the slider on its two sides in two turn around a stationary as well as the axis parallel to the axis of the spindle bearing pivotable slide rails so displaceable and it is ascertained that, on the one hand, the distance between the pivot axis and the slide rail pivot axis adjustable and, on the other hand, the slider can be pivoted between two limit positions is.

The inventive design leads to a +5 simple arrangement in which the adjustment of the Slide with adjustable stroke and only by turning or swiveling parts around axes he follows. Here are rolling bearings, z. B. needle roller bearings, used that have no play and practically no wear work. Devices according to the invention therefore ensure a high level of accuracy, which in of the order of a thousandth of a millimeter.

Applicant:

Microrex Societe Anonyme, Saint-Etienne, Loire (France)

Representative: P. Meffert, patent attorney, Koblenz,
Kaiser-Wilhelm-Ring 27

Claimed priority:
France October 15, 1954

Francois Rosaz, Saint-Etienne, Loire (France),
has been named as the inventor

The invention is explained by way of example with reference to the drawings. It shows

Fig. 1 is a front plan view of the device according to the invention for adjusting a Slide with variable stroke, the handwheel for operating the spindle shown in dashed lines is;

Fig. 2 is a plan view, partly in section, of the device shown in Fig. 1;

Fig. 3 is a cross-section along the line 3-3 of Fig. 2,

Fig. 4 is a cross-section along the line 4-4 of Fig. 3;

Figs. 5, 6 and 7, 8 are schematic representations showing the operation of the device in two different Show settings.

The device shown interacts with a slide of the drive pulley of a centerless grinding machine. It includes a bearing 1 attached to the frame 2 of the machine; this has with it a piece of sliding rails 2 ¹ which form or are attached, on which the carriage 3 carrying the drive pulley slides.

The bearing 1 has bearing bores I ¹ , in which on rolling bearings, for. B. needle bearings, the shafts 4 and 4 ^{1 are} rotatably mounted. On the inside of the bearing bores I ¹ , the shafts have a conical end4 ² which fits into the corresponding conical bores of slide rails 5. The ends 4 ² are held in the bores by a screw and washer, the angular position being determined by a wedge 6.

On their opposite sides, the rails 5 each have one in the longitudinal direction

809 768/69

Claims (2)

device extending recess 51 in which a slider 7 runs; the rails 5 are connected by bolts and nuts 8. One end of the slider 7 is forked and has a bore 9. In this there is no play, z. B. with the help of needles, the flattened part 101 of the spindle bearing 10 is pivotably mounted. Spindle bearing 10 and spindle 11 are connected without axial play. Ball thrust bearings 12, the balls of which run in shells of part 10 and on conical shoulder II1 of spindle 11 and the cone 13 screwed onto spindle 11, are used for this purpose. At the end of the spindle 11 there is a drive handwheel 14 with a division to which a fixed pointer 15 is assigned. The handwheel 14 is used for the basic setting of the carriage 3 with respect to the workpieces to be ground. The spindle nut 16 is connected to the slide 3 in an articulated manner. It can be pivoted about pins 171 which are carried by a fork head 18. By changing the position of the slider 7 with respect to the rails 5, the eccentricity of the axis 9 to the axis 4-41 can be changed. The large hole 71 allows an adjustment of the slider 7 in spite of the bolt 8. The carriage 3 is adjusted by the shaft 4. This carries a connection piece at 43 and a coupling disc 19, with which it can be coupled to any delivery system that is independent of the invention. The infeed can also be carried out by Haod using the lever 20 which is attached to a shaft 21; this is mounted freely rotatably in a bearing 22 attached to the frame 2 of the machine. The clutch disks 211 and 23 connect the shafts 4 and 21 by engaging the centering pin 4 *. In the bearing 1 there is a recess I2 which enables the sliding rails 5 and the sliding piece 7 to be pivoted by approximately 90 °. The operation of the device can be seen in FIGS. 5 to 8. Fig. S and 6 show a first setting of the eccentricity m of the axes 9 and 4. The scheme of Fig. S shows the arrangement before the adjustment movement, while in Fig. 6 after actuating the lever 20 in the direction of the arrow, the part 10 by the value of Eccentricity m to. Workpiece is adjusted. The same is shown in Figs. 7 and 8 for a larger value of the eccentricity η. The adjustable eccentricity results in an adjustable slide stroke. Patent claims: 1. Feed drive for grinding slide with a spindle to adjust the clamping rod distance between Grinding wheel and workpiece axis and with one that acts directly on the spindle bearing and thus the eccentric system acting axially shifting on the spindle including the slide, by which the slide with decreasing speed, d. H. first with express and then can be brought up to the workpiece axis with ever decreasing fine feed speed or can be removed again after the end of the work process, characterized in that that under known training of the eccentric (5 to 9) as an adjusting eccentric as well with the spindle nut (16) attached to the slide (3) tiltable, the spindle bearing (10) on a slide (7) free of play and with a guide that is perpendicular to the spindle (11) and to the slide guide (2) parallel axis (9) is articulated and the slider (7) on both sides in two in turn around a stationary and parallel to the articulation axis (9) of the spindle bearing (10) Axis (4) pivotable slide rails (5) so displaceable and lockable (8) added is that, on the one hand, the distance between the articulation (9) and the sliding rail pivot axis (4) is adjustable and on the other hand the slider (7) is pivotable between two limit positions. 2. Infeed drive according to claim 1 with hand lever actuation, characterized in that the two Slide rails (5) can be moved around their pivot axis (4) by means of a hand lever (20). Considered publications:
German patent specifications No. 691791, 571934, 552220, 488492, 404986, 374286, 314679, 74159; Austrian Patent No. 61 048;
U.S. Patents Nos. 2,639,563, 2,597,242, (Re 23 808), 2 552 447, 2 297 045, 2 116 794, 022 646, 1 928 162, 1 881 984. 1 sheet of drawings © 809 768/69 2.59