Feed device for machine tools, in particular for finishing screwdriver bits
AssigneeWera Werk Hermann Werner GmbH & Co.
InventorHans Udo Heym
Life of this patent
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Abstract
The invention relates to a feed device for machine tools with chuck arranged at the free end of a spindle, to which chuck the workpiece is fed axially through the inside of the spindle from the rear by means of compressed air from a compressed air nozzle through the spindle (1) into the chuck (2), having a tool station arranged in front of the head of the chuck and having a stop which comes in front of the head of the chuck (2) in synchronism with the machining for halting the movement of the individual workpiece (8). In order to increase the productivity, a brake member is arranged in the axial hollow (11) of the spindle (1) between the entrance end and the chuck (2).
Claims14
A machine tool with feed device comprising
- a chuck arranged at a free end of a continuously turning spindle to which chuck an individual workpiece is fed axially through an axial hollow inside of the spindle from a rear by means of compressed air from a compressed air nozzle through the continuously turning spindle into the chuck,
- a tool station arranged in front of a head of the chuck,
- a stop which, in a machining cycle, comes in front of the head of the chuck in order to stop movement of the individual workpiece,
- a brake member arranged in the axial hollow of the spindle between an entrance end thereof and the chuck, said brake member having a form of a transition step of a first spindle section and a second region, said transition step allowing passage of the workpiece completely therethrough, the compressed air pressing the workpiece against said step for stopping the workpiece,
- for feeding of the workpiece having a non-circular cross section, the second region has a non-circular cross section which is adapted to the non-circular cross section of the workpiece, and the first spindle section has a cross section which surrounds the workpiece, and
- said transition step is so arranged behind the head of said chuck that the workpiece leaves the brake member with reduced speed in order to come against said stop.
Dependencies are inferred from the claim text.