Turning – Lathe – With work feeder or remover
Patent
1989-07-06
1991-03-12
Terrell, William E.
Turning
Lathe
With work feeder or remover
82130, 82131, 82118, B23B 1300, B23B 1700
Patent
active
049984551
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an automatic lathe for machining work bars, comprising and through the tool head, an area of the work bar which has been pushed through the head stock and the tool head and for exerting forwardly directed axial pull on the bar, and a severing means for cutting machined workpieces from the work bar.
A known automatic lathe of this kind (DE 12 99 482 C3) has its rear feeding means embodied substantially by a saddle which is guided on guide means for displacement in the longitudinal direction of the automatic lathe, comprises a collet chuck for gripping a work bar, and cooperates with cams which are fixed on a main control shaft of the automatic lathe. One of these cams causes axial to and fro movements of the saddle; another cam controls the collet chuck such that it will be closed on each forward movement of the saddle toward the head stock, while it is open during the return movement of the saddle. A working material holding device is arranged stationarily at the backside of the head stock, facing the feeding means, and likewise controlled by a cam fixed on the main control shaft such that it always is open during the forward movement of the feeding means, while it is closed for the return movement thereof in order to prevent the work bar from moving back together with the feeding means. A front chuck means comprising a pair of profiled jaws for gripping a machined front section of the work bar is arranged ahead of the spindle head, i.e. at the side thereof which is remote from the feeding means, likewise being mounted on an axially displaceable saddle. The saddle of the front chuck is interconnected with the saddle of the rear feeding means by a threaded rod of adjustable length for common back and forth movement in axial direction. Another threaded rod connects a circular saw, used as severing device, with the saddle of the rear feeding means.
With this known automatic lathe problems always occur when a work bar is substantially used up, leaving behind in the head stock a residual piece which must be ejected and replaced by a fresh work bar. If it is desired that the rear end of each work bar, as it passes through the rear feeding means, be followed directly by the front end of a fresh work bar that requires an additional apparatus to push the fresh material bar forward until it is grasped by the rear feeding means. If the remainder of a used up work bar is ejected in forward direction by the subsequent work bar, accidents may result. For this reason it is necessary to wait with the pushing up of a fresh work bar until the preceding one has been consumed and the rest thereof has been ejected to the rear out of the head stock.
A severing machine is known from DE 36 33 691 C1 with which work bars are cut into individual sections by a circular saw arranged in a cutting plane without having previously been subjected to any processing in the same machine. No structural groups are provided which might be comparable with a tail stock or a revolving tool head of an automatic lathe. Consequently the problem of ejecting remaining pieces out of a head stock or rotatably driven tool head does not exist. Following each cut, the circular saw is moved so far away from the work bar in radial direction that it makes room for jaws which will grasp the respective front end of the work bar. On the whole, the known machine comprises three pairs of jaws, namely one pair of stationary gripping jaws, one pair of discharging jaws, and one pair of advancing jaws. The gripping jaws are disposed upstream of the severing plane in the direction of conveyance of the work bar. The discharging jaws are disposed downstream of the severing plane and are movable to and fro in longitudinal direction of the work bar, and they hold the respective front end of material to be cut off before and while it is being cut and then move it away. The advancing jaws extend through the cutting plane when the piece of material has been severed and the circular saw withdrawn, and they now grasp the front end of the material bar so
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Morris Mark A.
Terrell William E.
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