Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1977-12-19
1979-09-18
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318565, G05B 1928
Patent
active
041684583
ABSTRACT:
A method and apparatus are disclosed for detecting, signalling and sorting inaccurately formed articles produced by a tool machine which machine has a first relatively stationary machining element and a second movable machining element cooperating with the stationary machining element. A rotatable pulse generator rotated by any suitable drive portion of the tool machine is used to generate pulses, the number of which is proportional to the movement of the movable machining element. The number of pulses generated between the starting and stopping of the movable machine element are counted and compared to preset lower and upper limits. A logic circuit then emits a signal to a power amplifier and a reject switch if the counted number of pulses falls outside of the lower and upper limits that have been preset. The reject switch may either shut down part or all of the machine or operate a gate in a chute through which the article must pass and directs the same to the reject bin if the same is inaccurately formed. Additionally, a statistical control is provided to count the number of inaccurately formed articles in any given production run and if the proportion of inaccurately formed articles exceeds a preselected amount then, in that event, the operator is given a signal or the machine is shut down automatically or both.
REFERENCES:
patent: 3139570 (1964-06-01), Jacobson et al.
patent: 3414785 (1968-12-01), Orahood et al.
patent: 3585376 (1971-06-01), Toscano
Dobeck B.
Nedschroef Octrooi Maatschappij N.V.
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