DE2060057A1 - Chuck for automatic lathes processing material bars - Google Patents

Description

B 98 Bremen, 5th December 1970

Andre Bechler Montier (Switzerland)

Chucks for automatic lathes processing material bars

The invention relates to a chuck for material bars

,, _nbacken turning machines with a chuck body at more clamping ^ _n R _{a (g a} i _r i _C i and Pla displaceable approximately parallel to the axis extending in ijirer Mitfeellage ,,

Clamping force transmission levers are pivotally mounted in corresponding, and with a relative to the lu & b "er body kaaxial, longitudinally movable and on the

acting actuator.

of this type are already known (Swiss;

No> 221.655), but only for clamping thin Material suitable for rods.

Efep. The invention is based on the object of such a clamping to train fiuteteer in such a way that it is suitable for the passage and the span ^ no, rods made of thick material, e.g. those with a diameter

KI9 & 40 / T012

_ ₂ _ 2Ö6ÜÜ57

knife from 20 to 60 mm, and is also suitable for internal clamping of workpieces. In addition, the outside diameter should of the chuck must be as small as possible for a given size of the diameter of the material rod passage, which means that the moving parts should be accommodated in an annular space that is as narrow as possible in the radial direction. Nonetheless is intended to ensure the proper guidance of the actuating member, which is necessary for a good functioning of the chuck be.

This object is achieved according to the invention in that the Actuating member essentially has the shape of a hollow cylinder with outwardly projecting arms on its rear part, which each have a groove inclined to the main chuck axis, in which one at the rear end of the associated transmission lever hinged stone engages, these arms at their outer end with a sliding fit on a jacket part of the chuck body support, whereas a closer to the clamping jaws, hollow cylindrical part of the actuating member with a sliding fit is supported on a ring that surrounds this part and is fixed in the chuck body.

The accompanying drawing shows an embodiment of the invention It show:

Fig;, I a longitudinal section of the chuck,

Rig, 2 a cross section, along the line II-II of FIGS. 1 and

Fig. 3 is a longitudinal section of a detail along the line III-III of Fig. 2.

In the drawing, 1 is provided with an outer flange la Work spindle one for processing about 20 to 60 mm thick material bars certain automatic lathes, with 2

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the usual clamping tube Tse'zeiefmet, which is arranged in such a spindle and is axially movable back and forth by a device (not shown), which has an external thread 2a at its front end. ■■ '. ιε -..-, .--,

The chuck has a body made up of parts U and 5 fastened to one another by screws 3. The part M has an obstructing, circumferentially uninterrupted fastening flange l »a with Öewlndeiöeliern * ib for screws 6 used for fastening to the spindle flange la, an elongated intermediate section with cheeks * ld which are connected to one another by hollow cylinder sections Mc and project outward in pairs, and front flange sections Me ₉ so that the space between the cheeks Ma of each pair is left open. The chuck body part 5 has a hollow cylindrical jacket 5a which surrounds the part M in a supporting manner, with its rear end in an undercut of the flange Ma. ends, and front inner flange attachments 5b »whose mutually facing and mutually parallel sides are designed as guides for the parts 7a of clamping jaws 7.

The chuck body part 4 is provided at the front with a guide ring 8 which is pressed into its hollow cylinder sections 4c and which is also secured by a screw 9 on one of these Abseimitte Mc.

The chuck also has an actuating member 10. This has essentially the shape of a hollow cylinder, on the rear part of which arms 10a projecting radially outward are formed in one piece. These arms support each other with hers outer end with a Qleltsitz on the jacket 5a of the chuck body part 5 and on one of its side surfaces with a main axis to the chuck inclined groove 10b they are provided. The front, hollow cylindrical part 10c of the actuating memberB * IO is guided with sliding fit int ring &. '^ ^ <- ^. &

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BATH ORIGINAL

. "V" 2060U57

Two-armed transmission levers 11 which are approximately parallel to the main axis of the chuck in their central position shown in FIG. 1 are mounted on an associated pair of cheeks ¹ Id by means of an axle bolt 12 each; on the longer rearwardly protruding arm 11a of each such lever 11, a stone I ¹ I is pivotably mounted at the rear by means of an axle pin 13, which slidably engages in the groove 10b of the adjacent, associated arm 10a; the short front arm 11b of each lever 11 engages with practically no play in an associated recess 7b in the rear part 7a of the associated clamping jaw 7.

It is easy to see that in the case of an axial movement of the actuating member 10 transmitted through the clamping tube 2 in one sense or the other by means of the stones I ² J sliding in the grooves 10b, the transmission lever 11 is also pivoted in the corresponding sense and the clamping jaws 7 in the opening or in the Closing sense can be shifted. Even if the clamping jaws 7 come into attack on the workpiece, e.g. the material rod, and the clamping force then increases, the actuating member 10, which, like the lever 11, transmits this clamping force from the clamping tube 2 to the clamping jaws 7, is at the front inside on the ring 8 and at the rear outside on the jacket 5a perfectly guided and supported. It is important that the hollow cylindrical part 10c of the actuating member can be elastically deformed under the influence of the stress occurring during tensioning to such an extent that a completely play-free contact with the jacket 5a and the guide ring 8 is achieved. It can therefore not happen that the perfect centricity is lost under the influence of a force acting radially on one side during machining of the clamped workpiece. It is also easy to see in particular from Fig. 1 that the transmission elements - member 10 and lever 11 - are housed in an annular space of relatively small radial extent, with the result that for a given diameter D of the passage for the material rod, the outside diameter of the chuck is relatively small.

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Claims (3)

PATENT CLAIMS 1.) Chucks for automatic lathes processing bar material, with a chuck body on which several clamping jaws can be moved in the radial direction and are in their central position two-armed clamping force transmission levers, extending approximately axially parallel, pivotable in corresponding radial planes. are superimposed and coaxial with respect to the chuck body, longitudinally movable and acting on the Spanrtkraftübertragungshebel actuating member, characterized in that this actuating member (10) is substantially i the form of a hollow stern has with at .dessen rear part outwardly projecting arms (10a ), each having a groove (10b) inclined to the main axis of the chuck, in which a stone (14) hinged at the rear end of the associated transmission lever engages, these arms being supported at their outer end with a sliding fit on a casing part (5a) of the chuck body, whereas a hollow cylindrical part (10c) of the actuating member closer to the clamping jaws is supported with a sliding fit on a ring (8) which surrounds this part and is fixed in the chuck body. 2. Chuck according to claim 1, characterized in that the chuck body consists of two by screws to each other for fixed parts (3) ⁽¹ J, 5), namely a first part (4) ^ a rear continuous in the circumferential mounting flange ⁽¹ Ia), an elongated intermediate section with cheeks (4d) which are connected to one another by hollow cylinder sections (4c) and project outwards in pairs, on which the transmission levers (H) are mounted at the front and the arms (10a) of the actuating element (10) and the stones (I ¹ O are guided laterally, and front flange sections (4e) between the outwardly protruding cheeks »and a second part (5) with a hollow cylindrical jacket (5a) which surrounds the first part and supports the arms (10a) of the actuator as Support is used, and with front, inwardly directed flange lugs (5b), the 109840/1012 BAD OR | 206ÜU57 are attached to the front flange sections ( ¹ Ie) of the first part by axially extending screws (3), the mutually facing sides of the flange attachments being designed as guides for the clamping jaws. 3. Chuck according to claim 1 or 2, characterized in that the hollow cylindrical part (10c) of the actuating member (10) to such an extent under the influence of the clamping occurring stresses is elastically deformable that a completely play-free system on the jacket (5a) and on Guide ring (8) comes about. 109840/1012 BATH ORIQINAL Empty e.ite