System for the production of an additional rotational motion of a helically toothed gear workpiece in a positively controlled gear processing machine
AssigneeReishauer AG
InventorArthur Angst
Life of this patent
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Abstract
The present invention relates to a method and apparatus for the production of an additional rotational motion of a helically toothed gear workpiece in an electronically, positively controlled gear processing machine operating according to the hobbing method which has separate rotating drives for workpiece and tool. In this process, a series of impulses are supplied to a controller. These impulses are compared to each other for the production of a control signal for the readjustment of the workpiece drive. The series of impulses are dependent upon the rate of rotation of each of the drives. An additional signal is supplied which is derived from the longitudinal advance of the workpiece in relation to the tool.
Claims12
In a method for the production of an additional rotational movement of a helically toothed gear workpiece in an electronically controlled positive movement gear hobbing machine, said machine having separate turning drives for the tool and the workpiece, wherein sequences of pulses dependent upon the rotation of each drive are supplied to a controller, said pulses being compared to each other for the production of a control signal for the readjustment of the workpiece drive, with an additional signal supplied that is derived from the longitudinal feed of the workpiece with respect to the tool, the improvement comprising;
- producing measurement pulses dependent upon the longitudinal feed of the workpiece, producing a constant number of intermediate pulses after the beginning of every interval limited by two successive measurement pulses in time-wise at least approximately even sequence, the distance between the intermediate pulses during said limited interval being determined by the measurement of the length of the previous interval and of an at least approximately even distribution of a certain number of intermediate pulses with respect to the measured interval length, and providing in each interval that is longer than the previous one, a pulse-free interval section after the last of the intermediate pulses that have been produced with the specific number, and producing in each interval, which is shorter than the previous one, the excess intermediate pulses in the subsequent interval with a higher pulse sequence frequency between the measurement pulse forming the subsequent interval's beginning and the first subsequent intermediate pulse and in that the measurement pulses and intermediate pulses that are produced in all successive intervals are fed to the controller as an additional signal.
Apparatus for the production of an additional rotational movement of a helically toothed gear workpiece in an electronically controlled positive movement tooth gear hobbing machine, said machine having separate turning drives for the tool and the workpiece, a linear encoder for a longitudinally travelling carriage of the gear processing machine comprising an optical scale and an attendant reading head producing measurement pulses, the improvement comprising;
- a pulse generator for the production of pulses of constant frequency which is greater than the frequency of the measurement pulses, said measurement pulses being multiplied by the specific, constant number, first circuit means for the division of the pulses of the pulse generator by said constant number and for the counting of the divided pulses during an interval lying between the first and a second measurement pulse, second circuit means for the division of the pulses of the pulse generator in each interval by the count of the first circuit means, and third circuit means connected to said second circuit means for addition to the measurement pulses of pulses produced in the second circuit means, said third circuit means comprising gate circuits for blocking of the pulses of the second circuit means whenever the number of said pulses in the interval between the second and the third measurement pulse reaches a constant number or, said gate circuits adding the pulses of said second circuit means if the number of the pulses of the second circuit means does not reach the specific constant number in the interval between the second and the third measurement pulses.
Dependencies are inferred from the claim text.