Abstract: An operation control apparatus is provided of a compressor having a rotary shaft which is rotated by a driving apparatus by way of a clutch. The operation control apparatus comprises a recess or projection formed in or on one end surface of the rotary shaft as a portion-to-be-sensed offset from the axis thereof, an electromagnetic sensor disposed in facing relation with a locus described by the recess or projection according to the rotation of the rotary shaft, and a pulse monitoring circuit connected to the sensor. The sensor generates a periodic pulse signal in response to rotation of the rotary shaft. The pulse monitoring circuit generates a clutch release commanding signal to the clutch when it receives no pulse signal from the sensor for a predetermined time duration to protect the driving apparatus.

Abstract: A fixing device used for a distributor which includes a cylindrical portion, through which a driving shaft is pierced, and a flange for fastening the distributor to the engine with a bolt. The fixing device consists mainly of a pair of container-like covers to be faced to each other with an opening portion thereof for being fitted, one into the other, to untouchably cover the head of the fastening bolt. Both are provided with a bottom plate and a side wall and one of the covers is further provided with a through-hole in the center of the bottom plate for being pierced by the fastening bolt. Both covers are further given necessary dimension to be mutually fitted, one into the other, and accommodate the head of the bolt in the enveloped space between the both covers. Either one cover is provided with engaging tongues for engaging with engaging portion(s) formed in the side wall of the other cover.

Abstract: A fuel control apparatus for a diesel engine is provided with a control lever which reciprocates between two positions under control of a motor shaft which rotates in one direction only. The control lever connects to a fuel control lever which is moved from a fuel shut-off position to a starting fuel increasing position and then to a normal fuel supply position in accordance with the movement of the control lever. Motor control is effected by relay control in accordance with the positions of a key switch, a pattern switch rotating angularly with the motor shaft, and a switch which determines whether the engine is rotating or at rest.