Rotational angle control of screw tightening

Details Rotational angle control of screw tightening Rotational angle control of screw tightening

1989-02-01

1990-10-02

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

173 12, 318652, 388810, G05B 1928

Patent

active

049610350

ABSTRACT:
The turn-of-nut tightening method that is improved by determining the starting point only through measurements of the angle and time relationship to determine the linear portion of the tightening curve, which is extended to the previous free running speed point where the corresponding angle is determined as the starting angle, to which is added a fixed turning amount to control the end of the tightening. As a specific embodiment, the turning angle is chosen as the variable and measured with specific time intervals. Using fixed time intervals, time is removed as a variable. Therefore, with a simple and economical angle measuring device, such as a shaft encoder, tightening is accurately controlled.

REFERENCES:
patent: 3940675 (1976-02-01), Schroeder
patent: 4083270 (1977-03-01), Tomkinson
patent: 4185701 (1920-01-01), Boys
patent: 4285112 (1981-08-01), Eshghy
patent: 4316512 (1982-02-01), Kibblewhite et al.
patent: 4611377 (1986-09-01), McCormick et al.
patent: 4648282 (1987-03-01), Alender et al.
patent: 4766985 (1988-08-01), Brusasco

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