Abstract In an intermittent link mechanism including a driven gear engageable with a drive gear to cause a predetermined changeover operation and including a recess partly breaking the tooth train of the driven gear to intermittently breaking the linkage with the drive gear, the driven gear is integrally formed with a cam for engagement with a stopper to lock the driven gear at the disconnected position. The improvement comprises first spring biasing the stopper for continuous contact with the cam, a blocking surface and an urging corner both formed at one end of the stopper back to back with each other, an engagement surface formed in the cam for contact with the blocking surface, a slanting surface formed in the cam for contact with the urging corner, a pin formed on the driven gear and slidably received in an elongated slot formed in an changeover member, and second spring biasing the changeover member so as to apply a starting rotational force to the driven gear.
An intermittent link mechanism which comprises: a drive gear; a driven gear having two circumferentially spaced-apart recesses partly breaking a tooth train thereof so as to intermittently engage with and be discontinuously driven by said drive gear; a cam integrally formed with said driven gear, said cam having two circumferentially spaced-apart sets of surfaces, each set of surfaces including an engagement surface and a slanting surface; a stopper engageable with said cam for locking the same, said stopper being formed at one end thereof with a projection including a blocking surface engageable with an engaging surface of said cam and an urging portion engageable with a slanting surface of said cam; a first spring biasing said stopper for continuous contact with said cam; a pin formed on said driven gear; a changeover member having an elongated slot slidably receiving said pin therein; and a second spring biasing force said changeover member so as to apply a starting rotational force to said driven gear.
Claim 2
Dependent Claim
163 words
An intermittent link mechanism which comprises: a drive gear; a driven gear having two circumferentially spaced-apart recesses partly breaking a tooth train thereof so as to intermittently engage with and be discontinuously driven by said drive gear; a cam integrally formed with said driven gear, said cam having two circumferentially spaced-apart sets of surfaces, each set of surfaces including an engagement surface and a slanting surface; a stopper engageable with said cam for locking the same, said stopper being formed at one end thereof with a projection including a blocking surface engageable with an engaging surface of said cam and an urging portion engageable with a slanting surface of said cam; a first spring biasing said stopper for continuous contact with said cam; a pin formed on said driven gear; a changeover member having an elongated slot slidably receiving said pin therein; and a second spring biasing force said changeover member so as to apply a starting rotational force to said driven gear.