DE1871839U - CLAMPING CARTRIDGE FOR MACHINE TOOLS. - Google Patents

Description

.215692 * 29.3. B3

PATENT ADVOCATE

DIPL-ING. ERICH SCHUBERT

Phone: 22802

Telegram addr .: Pafschub, Siegen

Abs .: Patent attorney Dipl.-Ing. SCHUBERT, Siegen i. Westf., PO Box 325 Post check accounts:

Cologne 106931, Essen 20362

Bank accounts:

Deutsche Bank AG.,

Siegen and Oberhausen branch (RhId.)

62 119 / K. - ■ U 3435 / 49a Gm

United Kingdom Atomic Energy Authority March 28, 1963

For this application, priority becomes from the UK patent application Mr. 3757/61 from 1. IeTDr. 61 claimed.

Collet for machine tools

The control refers to equipment parts for machine tools, in particular on collet-shaped chucks for holding workpieces (hereinafter referred to as "clamping cartridge" called).

Note: This document (description and protection claim) is the last one submitted ©; it differs from the original version of the documents submitted. The legal significance of the deviation is not checked. The originally submitted documents are in the official file. They can be viewed free of charge at any point of legal interest. Upon request, cilich Fetekeplef » §ä§f film negatives were delivered at the usual prices. German Patent Office, useiflferafellft.

There are different types of clamping cartridges for holding rods with a circular cross-section in machine tools "known ι one of the known clamping cartridges has a generally cylindrical tubular component which has a conical shape on the outside at one end, which diverges towards this end, and is split from the other end to form resilient finger-shaped components (hereinafter referred to as "finger components"), which are enclosed by an outer sleeve with a conical inner bore the outer cone of the tubular component so that when the tubular component is withdrawn into the socket, the fingers are pressed radially inward to grip the rod.An undesirable property of this type of collet is that precise axial fixation of the rod is difficult is to be achieved because the fingers in di e tapered bushing can be pulled in, thereby moving the rod axially. This is of lachteil, ψβηη an exact axial fixation of the workpiece in-the-machine tool is required, e.g. when the workpiece has the shape of a cylindrical rod with a circumferential groove and an end section is to be cut away in order to achieve an exact dimension within fine accuracy the rod end and the hat to form. In an earlier attempt to axially fix the rod before cutting the fut, a long rod was provided which passed through the spindle of the headstock of the machine tool and which ended at the end remote from the cartridge (hereinafter

with "back end" ") was attached while the other end within the cartridge, which abutted the workpiece and formed a detent or a stop for this, found. The relative quality of the orientation of the workpiece end to the cutting tool (this orientation being dependent on the relationship between the rod length and the distance between the Rear end and the cutting tool) has been compromised due to thermal expansion and dimensional inaccuracies. Another disadvantage of a collet of the type described is the fact that a push or push component must be provided between the outer sleeve and the headstock to absorb the shock that occurs during retraction of the tubular member is exerted into the socket.

The purpose of the haggling is to create a collet, in which the workpiece can be clamped without it being subjected to an axial displacement relative to the machine tool.

A clamping cartridge according to the invention for a machine tool has a generally cylindrical component which is split or slotted to form at least three fingers, furthermore a concentric outer sleeve on this tubular Component, whereby an eccentric surface operative connection takes place between this socket and these fingers, whereby the fingers can be bent in a generally radial direction by rotating the socket on the component.

The tubular component can inside with an annular Approach are provided to "form a stop for a workpiece".

The innovation is now based on them for example

reproducing drawing explained in more detail, namely shows or show the

Figs. 1 and 2 perspective views of components of the clamping cartridge,

Fig. 3 is a side view in central section of the cartridge, while

! ig. 4 shows a band view in the direction of arrow A of I ¹ Ig. represents.

As shown in the drawings, a collet has a generally cylindrical tubular component 1 with slots 2, which form four resilient fingers 3 ", and a concentric one Outside bush 4> which is rotatable in component 1 and inside with four Equidistant from one another Yorsprüngen 5 is provided. The fingers 3 have eccentric curved surfaces 6, which when Operation by rotating the bushing 4 in one direction relative to the component 1 with the projections 5 cooperating with the fingers 3 to bend radially inwards, with a. Rotation in the opposite Direction is used to let go of the fingers 3 for an outward movement due to their elasticity ". The component 1 has a closed end 7 with a coaxial rectangular or square opening or recess 8 and is with an inner

annular projection 9 is provided. Two diametrically opposite each other Dowels 10 act with two partial circumferential slots 11 in the Socket 4 together to limit the angular rotation of the. To determine bushing relative to component 1. The bushing 4 also has a closed end 12 with a coaxial star-wedge bore 13th

The clamping cartridge described is intended for use in conjunction with a second cartridge (not shown), which does not have the shoulder 9, but is otherwise the same as the above-mentioned cartridge. The cartridges are attached to two of each other opposite, axially spaced-apart headstock (none of which is shown) arranged so that they grip a cylindrical workpiece at its end pieces .. The workpiece has a circumferential groove that is exactly finer inside Borders spaced from one end and attached to one Intermediate point of a pair of spaced Y-brackets is held, this one end of the workpiece abuts against the extension 9 of the cartridge described, so that the Groove is axially fixed in relation to two rotary knives. The knives between the V-brackets and the cartridges are each arranged at one end are rotatable about the axes of the headstocks in order to sever or cut off the end pieces of the workpiece. Thus the lut is exactly relative to the ends of the finished one Rod aligned, and while cutting. Is prevented the ends held in the cartridge from springing and thereby breaking the knife. Die.Bauteile 1 are through

Yierkantstangen, which pass through each headstock in order to come into operative connection with the corresponding opening 8, rotated void the bushings 4 by concentric wedge-shaped milled tubular components (not shown) which come into engagement with the corresponding star-wedge bores 13, the tubular components also lead through the headstock. When the sleeve 4 is rotated counterclockwise (as in Mg. 4) within the limits determined by the dowels 10 in the slots 11, the fingers 3 are bent radially inward to grip the rod without any axial displacement occurring, whereby by rotating the bushing 4 in the opposite direction, the lingers 3 are released from their gripping connection due to their elasticity.

Another advantage results from the use of a collet of the type described in that no push or push component is required between the headstock and the outer sleeve is - a circumstance which, when space is limited, is of particular importance because of the considerable savings is.

The firing range also relates to machine tools that are equipped with one or more of the clamping cartridges described above are provided.

Protection claims

Claims (2)

March 28, 1963 S1Chut ζ ans test 1. Clamping cartridge for machine tools, characterized in that that an approximately cylindrical clamping component (1) which is slotted so that it has at least three gripper fingers (3) "forms, is arranged in a concentric outer bushing (4) and that" when the bushing (4) is rotated relative to the clamping "component (1) due to the eccentric load-bearing effect between the bushing (4) and the gripper fingers (3) these in a radial direction Direction to be deformed. 2. Collet according to claim 1, characterized in that the tubular component has an inner annular extension Has.