Electrical motor-driven timer

An electrical motor-driven timer comprising:

• a frame having a substantially rectangular section and including a main plate with a scale plate attached on the upper surface thereof, a yoke, and a switch mechanism support member made of an insulating material;
• a timing mechanism contained in the substantially upper half part of said frame and including a motor, a reduction gear train coupled with said motor for transmitting the rotation of said motor, a main gear for instructing a predetermined time delay, and a clutch gear for coupling said reduction gear train with said main gear, said main gear having a pointer mounted on the shaft thereof and positioned over said scale plate;
• an electromagnetic device disposed in the substantially lower half part of said frame, said electromagnetic device including an armature, a solenoid, and an iron core magnetically coupled to said yoke, said solenoid being adapted to be energized simultaneously with the energization of said timer thereby to operate said armature;
• and
• a switch mechanism supported on said support member, said switch mechanism including a contact block, said contact block including an instantaneous contact group operated simultaneously with the energization of said timer, a timing contact group operated with said predetermined time delay and normally-closed motor input contacts adapted to be open with said time delay, said switch mechanism further including instantaneous-operation cam member, a timing operation cam member, and a trip lever, said instantaneous-operation cam member and said timing-operation cam member being mounted above said contact block, said instantaneous-operation cam member being adapted to rotate to operate said instantaneous contact group, said timing-operation cam member being adapted to rotate to operate said timing contact group and said normally-closed motor-input contacts, said trip lever being disposed above said cam members rotatably in a plane perpendicular to the plane of rotation of said cam members and having its lower end removably engaging said timing-operation cam member and its upper end including a part projected to the upper surface of said main gear, said projected part being pressed into rotation by a protrusion provided on the upper surface of said main gear when said main gear rotates by a predetermined angle corresponding to said predetermined time delay.

An electrical motor-driven timer comprising a switch mechanism section, an electromagnetic device section and a timing mechanism section including a plurality of contacts, a part of said contacts being operated immediately after the energization of said timer, the other part of said contacts being operated with a predetermined time delay after the energization of said timer;

• wherein said timing mechanism includes a first section containing a motor, a second section containing a reduction gear train coupled to said motor, and a third section having a main gear for setting said predetermined time delay and ordering the timing operation and a clutch gear removably engaging said reduction gear train, said motor being started immediately upon the energization of said timer, said electromagnetic device being also energized immediately upon the energization of said timer, said switch mechanism including first operating cam means for operating said part of said contacts immediately in response to the energization of said electromagnetic device, said timer further including clutch-operating means for operating said clutch gear in response to the operation of said first operating cam means thereby to rotate said main gear, said switch mechanism further including second operating cam means for operating said other part of said contacts in response to a timed operation command produced by said main gear when said main gear rotates by a predetermined angle corresponding to said predetermined time delay.