Abstract: An automatic air conditioner for a vehicle comprising a cooling unit, heater and a blower fan which are controlled by a control circuit. The air conditioner is arranged to adjust a compartment temperature to a target value set by a target value setting means. Furthermore, the air conditioner has functions such as a quick cooling, a quick heating and a low water-temperature drive control to quickly adjust the compartment temperature to the target value. The air conditioner further includes a function wherein the change of the preset target value is forbidden in operation of the quick cooling, the quick heating and the low water-temperature drive controls to prevent the compartment from being over-cooled or over-heated by the change of the target value in the operation.

Abstract: Apparatus for positioning a movable member, the apparatus comprising a driving shaft, a driven shaft and a clutch for engaging and disengaging the driving shaft and the driven shaft. The circumferential surface of a cam fixed around the driven shaft has such a specified angle of an arc whose center is the axis of the driven shaft that the movable member is prevented from shifting the position due to inertia rotation of the cam and the driven shaft.

Abstract: In an image forming apparatus, a support member attachably and detachably supporting a plurality of developing units is provided for moving the developing units upwardly and downwardly or along a common circular orbit by vertical or rotative movement. A vertical movement support member balances with balancers, while a rotary support member has rotative balance by mutual position of each developing unit. A lock member for locking a support member at a desired position and a sensor for detecting the movement of the support member when unlocked are actuated for judging an unbalanced state of the support member by a detecting signal of the sensor.

Abstract: A push button switch which may be used, for example, as a zooming switch in a video camera, having a uniform electrical resistance/applied pressure characteristic and which can be manufactured easily and at a low cost. The switch includes a conductive layer and a pressure-sensitive resistance element disposed between electrode patterns provided on a printed circuit board and an insulated push button. The conductive layer is coated with a pressure-sensitive conductive paste and the pressure-sensitive resistance element is fixed to the insulated push button at a opposed surface to the electrode patterns separated by a predetermined distance.

Abstract: Improvements in a variable magnification projecting device for use in electrophotographic copying machines or the like to overcome the objections encountered when the magnification is varied greatly, such as a great amount of shift of the projection lens which requires a prolonged period of time, and a large amount of shift of a mirror in an undesirable direction. Variations between the same-size magnification and enlarged magnifications are effected by shifting the projection lens and at least a mirror in the rear of the lens, while variations between the same-size magnification and reduced magnifications are made by shifting the projection lens and at least mirrors in front of the lens.