Tool driving or impacting – Automatic control of power operated means
Patent
1999-06-16
2000-04-25
Smith, Scott A.
Tool driving or impacting
Automatic control of power operated means
173 4, 173 11, 173 19, 173171, B23Q 5033
Patent
active
060532580
ABSTRACT:
When a start SW 3 is pressed, a one-shot multivibrator circuit 15 turns on and releases a pulse. The pulse is transmitted to a self-hold circuit 16 which in turn stays in self-hold mode and releases an H level output continuously until it is reset. This cause a transistor 17 to turn on and actuate a ram downward movement relay R1. When the ram arrives at the lower limit of its movement, a lower LS 4 is opened causing a self-hold circuit 21 to produce an H level signal in accordance with an output of a one-shot multivibrator 18. The H level signal from the self-hold circuit 21 is delayed by a delay circuit 22 and turns on a transistor 23. As the result, a ram upward movement relay R2 is actuated. Because of the function of the one-shot multivibrator circuit 15, the ram will not restart when the start SW 3 is continuously depressed. The delay circuit 22 contributes to the longer operational life of a directional valve switching mechanism. Also, a combination of another delay circuit 19 and a logical product circuit 24 is provided for preventing any fault action derived from, chattering of the lower LS 4.
REFERENCES:
patent: 3469487 (1969-09-01), Brolund
patent: 3924330 (1975-12-01), Mitsuhashi et al.
patent: 5170358 (1992-12-01), Delio
patent: 5289885 (1994-03-01), Sakoh
patent: 5303162 (1994-04-01), Yoon
patent: 5474138 (1995-12-01), Evarts
Shimada Keisuke
Shoji Michihiro
Nitto Kohki Co. Ltd.
Smith Scott A.
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