Carbon ribbon vibrating device for a type bar typewriter

Claim 2

In a typewriter having typing instrumentalities power operable transitorily to effect individual typing impression at a printing point, a ribbon vibrator means operable from a retired to an operated position to present a ribbon at a printing point, resilient means for exerting an operating urge on said ribbon vibrator means toward said operated position, a cyclically rotatable cam, cyclic means effective incidental to each transitory operation of said typing instrumentalities to impart a cyclic rotation to said cam, a follower means controlled by said cam to hold said ribbon vibrator means normally in its retired position against the urge of said resilient means, but early in each cyclic rotation of said cam being operative to cause an operation of said vibrator means by said resilient means, a vibration stop for said ribbon vibrator means for limiting its vibration to a high throw for selection of a low-ribbon track, said vibration stop remaining standing during the machine operation, a stop (means) member for said ribbon vibrator means for limiting its vibration to a low throw for selection of a highribbon track, said stop (means) member being movable into and out of the operating path of said ribbon vibrator means respectively to one or another position to become alternately effective with said vibration stop, and means to effect incident to each cyclic rotation of said cam, late in such cyclic rotation, a positional alternation of said stop (means) member, whereby said ribbon vibrator means at alternate typing operation is given by said resilient means one tiMe a high- and the other time a low-ribbon vibrating throw.

Claim 3

The invention set forth in claim 1, further including a case shift mechanism movable from a lowercase to an uppercase state to condition the typing instrumentalities for typing by uppercase types, a stop element normally out of the operating path of said vibrator means and controlled by said case shift mechanism when moved to said uppercase state, to become positioned for stopping said ribbon vibrator throw slightly short of the high-throw limit afforded by said high-throw ribbon vibration stop, whereby in typing operations effected, while said stop means is out of the path of said ribbon vibrator means and while said case shift mechanism is in uppercase state, there will result a throw of the ribbon vibrator means slightly short of said high-throw limit afforded by said high-throw ribbon vibration stop.

Claim 4

In a typewriter having typing instrumentalities power-operable transitorily to effect individual typing impressions at a printing point, a ribbon vibrator means operable from a retired to an operated position to present a ribbon at a printing point, resilient means for exerting an operating urge on said ribbon vibrator means, a first cyclically rotatable cam, a second cyclically rotatable cam, cyclic means effective incidental to each transitory operation of said typing instrumentalities to impart a cyclic rotation to said cams, a follower means controlled by said first cam, to hold said ribbon vibrator means normally in its retired position, but early in each cyclic rotation of said cams being operative transitorily to cause an operation of said vibrator means by said resilient means, a ratchet wheel having a given number of teeth, ratchet wheel feeding means including a follower associated with said second cam, to impart a single tooth advance to said ratchet wheel late in each cyclic rotation of said second cam, a toothed control wheel having half the number of the teeth said ratchet wheel has, being rotatively associated with said ratchet wheel and having voids intermediate its teeth, a vibration stop for said ribbon vibrator means for limiting its vibration to a high throw for selection of a low-ribbon track, a stop means for said ribbon vibrator means for limiting its vibration to a low throw for selection of a high-ribbon track, said stop means being movable into and out of the operating path of said ribbon vibrator means, and means governed by successive tooth advances of said ratchet wheel late in the cyclic rotation of said second cam, to control said stop means by the teeth and intermediate voids of said control wheel to become moved into and out of the vibrating path of said ribbon vibrator means, whereby said ribbon vibrator means at alternative typing operations is given alternatively a high- and low-ribbon vibrating throw by said resilient means.

Claim 5

In a typewriter having typing instrumentalities power-operable transitorily to effect individual typing impressions at a printing point, a ribbon vibrator means operable from a retired to an operated position to present a ribbon at a printing point, resilient means for exerting an operating urge on said ribbon vibrator means, a first cyclically rotatable cam, a second cyclically rotatable cam, cyclic means effective incidental to each transitory operation of said typing instrumentalities to impart a cyclic rotation to said cams, a follower means controlled by said first cam, to hold said ribbon vibrator means normally in its retired position, but early in each cyclic rotation of said cams being operative transitorily to cause an operation of said vibrator means by said resilient means, a ratchet wheel having a given number of teeth, ratchet wheel feeding means including a follower associated with said second cam, to impart a single tooth advance to said ratchet wheel late in each cyclic rotation of said second cam, a toothed control wheel having half the number of the teeth said ratchet wheel has, being rotatively associated with said ratchet wheel and having voids intermediate its teeth, a vibration stop for said ribbon vibrator means for limiting its vibration to a high throw for selection of a low-ribbon track, a stop means for said ribbon vibrator means for limiting its vibration to a low throw for selection of a high-ribbon track, said stop means being movable into and out of the operating path of said ribbon vibrator means, and means governed by successive tooth advances of said ratchet wheel late in the cyclic rotation of said second cam, to control said stop means by the teeth and intermediate voids of said control wheel to become moved into and out of the vibrating path of said ribbon vibrator means, whereby said ribbon vibrator means at alternative typing operations is given alternatively a high- and low-ribbon vibrating throw by said resilient means.

Claim 6

The invention set forth in claim 3, said governed means including a sensing element which incidental to successive single tooth advances of said ratchet wheel alternately is moved into a tooth void or is cammed out of it, spring means urging said sensing element to enter said voids, and means connecting said sensing element to control said stop means to move into and out of the path of said ribbon vibrator means at alternate tooth advances of said ratchet wheel.

Claim 7

The invention set forth in claim 3, further including a ribbon feed roll rotatable by said ratchet wheel to draw a ribbon threaded through said vibrator means therepast each time a distance of about a half letterspace, a stop member movable from an idle to an operated position to block movement of said ribbon vibrator means by said resilient means, an element movable from an idle to an operated position to incapacitate said ratchet wheel feeding means, and a control having operative connections with said stop member and said movable element to set them concomitanTly in their idle or operated positions.

Claim 8

The invention set forth in claim 3, said cyclically rotatable cams having a plurality of cam sectors, and said cyclic means incidental to each transitory operation of said typing instrumentalities imparting a fractional rotation to said cams in accord with the number of cam sectors.

Claim 9

In a typewriter having typing instrumentalities each one associated with a type bar and operable to effect individual typing impression, each type bar being provided with a lowercase type and an uppercase type, a case shift mechanism movable from a lowercase to an uppercase state to condition the type bars for typing by uppercase types, a ribbon vibrator means operable from a retired to an operated position to present a ribbon at a printing point, resilient means for exerting an operating urge on said ribbon vibrator means, holding means to hold said ribbon vibrator means normally in its retired position, but early in each printing operation being operative to cause an operation of said vibrator means by said resilient means, a vibration stop for said ribbon vibrator means for limiting its vibration to a high throw for selection of a low-ribbon track, a stop means for said ribbon vibrator means for limiting its vibration to a low throw for selection of a high-ribbon track, said stop means being movable into and out of the operating path of said ribbon vibrator means, means to effect incident to each printing operation, late in such operation, a positional alternation of said stop means, whereby said ribbon vibrator means at alternate typing operations is given by said resilient means one time a high-and the other time a low-ribbon vibrating track, and a stop element normally out of the operating path of said vibrator means and controlled by said case shift mechanism when moved to said uppercase state, to become positioned for stopping said ribbon vibrator throw slightly short of the high throw limit afforded by said high-throw ribbon-vibrating stop, whereby in typing operations effected, while said stop means is out of the path of said ribbon vibrator means and while said case shift mechanism is in uppercase state, there will result a throw of the ribbon vibrator means slightly short of said high-throw limit afforded by said high-ribbon vibration stop.

Claim 10

In a typewriter having typing instrumentalities each one associated with a type bar and operable to effect individual typing impression, each type bar being provided with a lowercase type and an uppercase type, a case shift mechanism movable from a lowercase to an uppercase state to condition the type bars for typing by uppercase types, a ribbon vibrator means operable from a retired to an operated position to present a ribbon at a printing point, resilient means for exerting an operating urge on said ribbon vibrator means, holding means to hold said ribbon vibrator means normally in its retired position, but early in each printing operation being operative to cause an operation of said vibrator means by said resilient means, a vibration stop for said ribbon vibrator means for limiting its vibration to a high throw for selection of a low-ribbon track, a stop means for said ribbon vibrator means for limiting its vibration to a low throw for selection of a high-ribbon track, said stop means being movable into and out of the operating path of said ribbon vibrator means, means to effect incident to each printing operation, late in such operation, a positional alternation of said stop means, whereby said ribbon vibrator means at alternate typing operations is given by said resilient means one time a high-and the other time a low-ribbon vibrating track, and a stop element normally out of the operating path of said vibrator means and controlled by said case shift mechanism when moved to said uppercase state, to become positioned for stopping said ribbon vibrator throw slightly short of the high throw limit afforded by said high-throw ribbon-vibrating stop, whereby in typing operations effected, while said stop means is out of the path of said ribbon vibrator means and while said case shift mechanism is in uppercase state, there will result a throw of the ribbon vibrator means slightly short of said high-throw limit afforded by said high-ribbon vibration stop.