Two-speed continuous drive timer
AssigneeThe Singer Company
InventorGeorge Obermann
Life of this patent
Estimating the term…
Abstract
The motor drives the timing drum continuously at low speed through a gear train having a one-way clutch. The motor also drives the input of a second one-way clutch having a drive on its output engageable with the spaced teeth on the interrupted gear formed on the hub of the drum. When the low speed drive rotates the drum to a position in which a tooth on the hub can be engaged by the drive gear the drum is rapidly advanced until contact with the tooth is lost. Switches operated by the cams on the drum are sequenced rapidly during rapid advance. When the drum is manually advanced both clutches are overridden.
Claims10
A program timer having a plurality of timing cams located on a rotating member and controlling the operation of switches in a predetermined program, said rotating member being driven by a motor through a gear train, characterized by,
- a one-way clutch in the gear train and having an input and an output, the output being drivingly connected to the rotating member and overriding the input when the rotating member is rotated at a speed greater than imparted through the one-way clutch,
- a drive gear constantly rotated by said motor,
- said rotating member including an interrupted tooth gear having gear teeth engageable by said drive gear and spaces between the gear teeth so the drive gear can only rotate the interrupted tooth gear when the drive gear engages one of the gear teeth, said rotating member being driven at higher speed when the drive gear drives the interrupted tooth gear.
A program timer having a rotatable program member provided with cams actuating switches in sequence, characterized by,
- a motor,
- a low speed drive connecting the motor to the program member and including an overrunning clutch having an input and an output,
- a high speed drive connecting the motor to the program member,
- means carried by the program member for engaging and disengaging the high speed drive,
- the output of the low speed drive overriding the input of the low speed drive when the high speed drive is engaged.
Dependencies are inferred from the claim text.