Gear cutting – milling – or planing – Milling – Including cutter limited to rotary motion
Patent
1995-08-18
1997-12-09
Rachuba, M.
Gear cutting, milling, or planing
Milling
Including cutter limited to rotary motion
409197, 409165, 82124, 82127, B23B 1300
Patent
active
056953054
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to a feed device for machine tools which has a work chuck arranged on the free end of a spindle in accordance with the preamble to claim 1.
Such a device is known from U.S. Pat. No. 4,794,831. In that case, workpieces which are individualized to the rear of the spindle are blown by means of a nozzle rearward into the inside of the spindle. A second nozzle which is displaceable in the axial direction of the spindle is present in front of the head of the chuck. The head of this nozzle is developed as a rubber stop. Upon the insertion of the workpiece from the rear, this rubber stop is displaced in front of the chuck so that the individual workpiece introduced is stopped by striking against this stop. After the machining of the workpiece, the spindle opens and the second compressed-air nozzle blows the workpiece through the spindle back out of the chuck.
SUMMARY OF THE INVENTION
The object of the invention is further to develop a feed device of the type in question in a manner simple to manufacture so as to increase its productivity.
As a result of the development of the invention, the productivity of the apparatus has been increased. Between the entrance end and the chuck, a brake member is arranged. An individual workpiece which is introduced into the entrance end of the axial hollow of the spindle is braked by means of the brake member before reaching the stop. In this way, the workpiece enters the chuck with reduced speed. The momentum of the workpiece upon striking the stop is thereby reduced. In this way, damage to a, for instance, pointed workpiece upon striking against the stop is advantageously prevented, despite the high speed of introduction. In addition to this, the tendency for the workpiece to rebound from the stop and to come to rest only after repeated striking against the stop until it is grasped by the chuck is reduced. In accordance with the invention, the workpiece is introduced by the action of compressed air into the entrance end of the axial hollow of the spindle. By the continuous action of compressed air, the workpiece is accelerated in the axial hollow. Before reaching the chuck, the speed is reduced by the brake member, so that the workpiece leaves the brake member with reduced speed. The brake member is preferably formed by a change in cross section of the axial hollow. In this connection, the axial hollow can first of all have a round projection between the entrance end and the brake member and, behind the brake member, a cross section other than circular so that the brake member is formed by the change in cross section. The braking of the axial movement of the workpiece takes place at the same time as a rotary acceleration of the workpiece to the speed of rotation of the spindle. The brake member is preferably arranged directly in front of the chuck. It is advantageous if the brake member is developed as a resiliently yieldable projection which enters into the cross section of the axial hollow. A workpiece which is introduced through the feed channel formed by the axial hollow is braked by displacement of the brake member. However, it is also provided that the brake member is formed by a friction surface which can also extend resiliently into the cross section of the axial hollow. The axial hollow preferably rotates in the region of the brake member. In this way, the speed of rotation of workpiece and spindle is synchronized. It is advantageous if only a single nozzle is used for the loading and unloading. The compressed air is fed from of the compressed-air nozzle arranged to the rear of the chuck twice per machining cycle in the same direction. With the first air pulse, the workpiece is introduced into the chuck. After striking against the stop, movement is removed from the workpiece. As a result of the fact that the compressed air is still flowing, a rebounding of the workpiece which may then take place is harmless. The workpiece is moved again and again towards the stop by the compressed air so that it co
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Farber Martin A.
Rachuba M.
Tsai Henry W. H.
Wera Werk Hermann Werner GmbH & Co.
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