Devices for shifting type carriers in electric typewriters and the like

Claim 1

A device for shifting a type carrier which is normally yieldably biased in one direction relative to a printing area on a carriage in an electrically driven typewriter or the like, and including a tensioned shifting band connected at one end to the carriage and at the opposite end to the carrier, comprising: a plurality of shift control rollers relatively oriented in a staggered relation and having the band looped thereover serpentine fashion; movable means supporting certain of the rollers, including an elongated member on which two of the rollers are supported in longitudinally spaced relation therealong; means operative to move the supporting means cyclically to vary the effective band length for shifting of the carrier between at least two printing positions; said two rollers having respective lost motion connection with said member; and means for selectively holding said two rollers against cyclic movement with said member as said member continues in the cyclic movement and a remaining of the certain rollers continues in the cyclic movement with the supporting meeans therefor; whereby to provide for a number of effective carrier-shifting band lengths and thus a number of printing positions of the carrier.

Claim 2

A device for shifting a type carrier which is normally yieldably biased in one direction relative to a printing area on a carriage in an electrically driven typewriter or the like, and including a tensioned shifting band connected at one end to the carriage and at the opposite end to the carrier, comprising: a plurality of shift control rollers relatively oriented in a staggered relation and having the band looped thereover serpentine fashion; movable means supporting certain of the rollers, including an elongated member on which two of the rollers are supported in longitudinally spaced relation therealong; means operative to move the supporting means cyclically to vary the effective band length for shifting of the carrier between at least two printing positions; said two rollers having respective lost motion connection with said member; and means for selectively holding said two rollers against cyclic movement with said member as said member continues in the cyclic movement and a remaining of the certain rollers continues in the cyclic movement with the supporting meeans therefor; whereby to provide for a number of effective carrier-shifting band lengths and thus a number of printing positions of the carrier.

Claim 6

A device for shifting a type carrier which is normally yieldably biased in one direction relative to a printing area on a carriage in an electrically driven typewriter or the like, and including a tensioned shifting band connected at one end to the carriage and at the opposite end to the carrier, comprising: a plurality of shift control rollers relatively oriented in a staggered relation and having the band looped thereover serpentine fashion; movable means supporting certain of the rollers, including an elongated member on which two of the rollers are supported in longitudinally spaced relation therealong; means operative to move the supporting means cyclically to vary the effective band length for shifting of the carrier between at least two printing positions; means for selectively holding said two rollers against cyclic movement with said member as said member continues in the cyclic movement and a remaining of the certain rollers continues in the cyclic movement with the supporting means therefor; said member comprising a rocking lever provided with a transverse journal slot in which an axle on one of said certain rollers is journalled; said means for selectively holding comprising a stop operative to hold said certain one of the rollers through said axle against continuing cyclic rocking movement with the lever; whereby to provide for a number of effective carrier-shifting band lengths and thus a number of printing positions of the carrier.

Claim 7

A device for shifting a type carrier which is normally yieldably biased in one direction relative to a printing area on a carriage in an electrically driven typewriter or the like, and including a tensioned shifting band connected at one end to the carriage and at the opposite end to the carrier, comprising: a plurality of shift control rollers relatively oriented in a staggered relation and having the band looped thereover serpentine fashion; movable means supporting certain of the rollers, including an elongated member on which two of the rollers are supported in longitudinally spaced relation therealong; means operative to move the supporting means cyclically to vary the effective band length for shifting of the carrier between at least two printing positions; means for selectively holding said two rollers against cyclic movement with said member as said member continues in the cyclic movement and a remaining of the certain rollers continues in the cyclic movement with the supporting means therefor; said member comprising a rocking lever provided with a transverse journal slot in which an axle on one of said certain rollers is journalled; said means for selectively holding comprising a stop operative to hold said certain one of the rollers through said axle against continuing cyclic rocking movement with the lever; whereby to provide for a number of effective carrier-shifting band lengths and thus a number of printing positions of the carrier.

Claim 10

A device for shifting a type carrier which is normally yieldably biased in one direction relative to a printing area on a carriage in an electrically driven typewriter or the like, and including a tensioned shifting band connected at one end to the carriage and at the opposite end to the carrier, comprising: a plurality of shift control rollers relatively oriented in a staggered relation and having the band looped thereover serpentine fashion; movable means supporting certain of the rollers, including an elongated member on which two of the rollers are supported in longitudinally spaced relation therealong; means operative to move the supporting means cyclically to vary the effective band length for shifting of the carrier between at least two printing positions; means for selectively holding said two rollers against cyclic movement with said member as said member continues in the cyclic movement and a remaining of the certain rollers continues in the cyclic movement with the supporting means therefor; said member comprising a first lever pivotally mounted at one end and having a cam follower at its opposite end; said means operative to move the supporting means cylically comprising a lobed cam operatively engaged by said follower whereby said first lever is rocked cyclically; a transversely opening lost motion journal slot intermediate the ends of said first lever; a second transversely opening lost motion journal slot in said first lever generally aligned with said follower; said two rollers having axles journalled in said journal slots; and said means for selectively holding said two rollers including stop members operable into and out of holding relation to the roller axles; whereby to provide for a number of effective carrier-shifting band lengths and thus a number of printing positions of the carrier.

Claim 11

A device for shifting a type carrier which is normally yieldably biased in one direction relative to a printing area on a carriage in an electrically driven typewriter or the like, and including a tensioned shifting band connected at one end to the carriage and at the opposite end to the carrier, comprising: a plurality of shift control rollers relatively oriented in a staggered relation and having the band looped thereover serpentine fashion; movable means supporting certain of the rollers, including an elongated member on which two of the rollers are supported in longitudinally spaced relation therealong; means operative to move the supporting means cyclically to vary the effective band length for shifting of the carrier between at least two printing positions; means for selectively holding said two rollers against cyclic movement with said member as said member continues in the cyclic movement and a remaining of the certain rollers continues in the cyclic movement with the supporting means therefor; said member comprising a first lever pivotally mounted at one end and having a cam follower at its opposite end; said means operative to move the supporting means cylically comprising a lobed cam operatively engaged by said follower whereby said first lever is rocked cyclically; a transversely opening lost motion journal slot intermediate the ends of said first lever; a second transversely opening lost motion journal slot in said first lever generally aligned with said follower; said two rollers having axles journalled in said journal slots; and said means for selectively holding said two rollers including stop members operable into and out of holding relation to the roller axles; whereby to provide for a number of effective carrier-shifting band lengths and thus a number of printing positions of the carrier.

Claim 15

A device for shifting a type carrier which is normally yieldably biased in one direction relative to a printing area on a carriage in an electrically driven typewriter or the like, and including a tensioned shifting band connected at one end to the carriage and at the opposite end to the carrier, comprising: a plurality of shift control rollers relatively oriented in a staggered relation and having the band looped thereover serpentine fashion; movable means supporting certain of the rollers, including an elongated member on which two of the rollers are supported in longitudinally spaced relation therealong; means operative to move the supporting means cyclically to vary the effective band length for shifting of the carrier between at least two printing positions; means for selectively holding said two rollers against cyclic movement with said member as said member continues in the cyclic movement and a remaining of the certain rollers continues in the cyclic movement with the supporting means therefor; said supporting means comprising three rockably mounted levers one of which is said elongated member; and said means operative to move the supporting means comprising a cam common to all three levers; whereby to provide for a number of effective carrier-shifting band lengths and thus a number of printing positions of the carrier.

Claim 16

A device for shifting a type carrier which is normally yieldably biased in one direction relative to a printing area on a carriage in an electrically driven typewriter or the like, and including a tensioned shifting band connected at one end to the carriage and at the opposite end to the carrier, comprising: a plurality of shift control rollers relatively oriented in a staggered relation and having the band looped thereover serpentine fashion; movable means supporting certain of the rollers, including an elongated member on which two of the rollers are supported in longitudinally spaced relation therealong; means operative to move the supporting means cyclically to vary the effective band length for shifting of the carrier between at least two printing positions; means for selectively holding said two rollers against cyclic movement with said member as said member continues in the cyclic movement and a remaining of the certain rollers continues in the cyclic movement with the supporting means therefor; said supporting means comprising three rockably mounted levers one of which is said elongated member; and said means operative to move the supporting means comprising a cam common to all three levers; whereby to provide for a number of effective carrier-shifting band lengths and thus a number of printing positions of the carrier.

Claim 23

A device for shifting a type carrier which is normally yieldably biased in one direction relative to a carriage in an electrically driven typewriter or the like, and including a tensioned shifting band connected at one end to the carriage and at the opposite end to the carrier, comprising: a plurality of shift control rollers relatively oriented in a staggered relation and having the band looped thereover serpentine fashion; movable means supporting certain of the rollers; means operative to move the supporting means cyclically to vary the effective band length for shifting of the carrier between at least two printing positions; means for selectively holding said certain rollers against cyclic movement with the supporting means therefor whereby to provide for a number of effective carrier-shifting band lengths and thus a number of printing positions of the carrier; yieldable means connected to said band enabling varying the actual carrier-shifting band length in addition to said effective carrier-shifting band length; means for effecting selective rotation of one of said control rollers; and means providing a driving connection between said one roller and said band to effect variation in carrier-shifting band length in the rotation of said one roller.

Claim 24

A device for shifting a type carrier which is normally yieldably biased in one direction relative to a carriage in an electrically driven typewriter or the like, and including a tensioned shifting band connected at one end to the carriage and at the opposite end to the carrier, comprising: a plurality of shift control rollers relatively oriented in a staggered relation and having the band looped thereover serpentine fashion; movable means supporting certain of the rollers; means operative to move the supporting means cyclically to vary the effective band length for shifting of the carrier between at least two printing positions; means for selectively holding said certain rollers against cyclic movement with the supporting means therefor whereby to provide for a number of effective carrier-shifting band lengths and thus a number of printing positions of the carrier; yieldable means connected to said band enabling varying the actual carrier-shifting band length in addition to said effective carrier-shifting band length; means for effecting selective rotation of one of said control rollers; and means providing a driving connection between said one roller and said band to effect variation in carrier-shifting band length in the rotation of said one roller.

Claim 25

A device including a shifting band connected at one end to a carriage and at its opposite end to a type carrier which is shiftable relative to the carriage and is normally yieldably biased in one direction, comprising: a pair of elongated levers having one of their ends pivotally mounted in adjacent spaced relation and their opposite ends in relatively free adjacent spaced relation and provided with cam follower means; a lobed cam rotatably mounted between and engaged by said follower means and operative in rotation of the cam to effect relative pivotal swinging of said levers; a plurality of rollers supported on said levers and located in relative staggered relation to each other; a looping member located generally between and spaced from said pivoted ends of the levers; a looping roller located adjacent and spaced from said free ends of the levers; said band being looped over said looping member, said plurality of rollers and said looping roller serpentine fashion; certain of said plurality of rollers having lost motion connection with one of said levers enabling movement of the certain rollers with the levers and also enabling movement of the levers while said certain rollers are held against movement with the levers; said band normally by its tension maintaining said certain rollers for movement with said one of said levers; and means for selectively holding said certain rollers against movement with said one of said levers whereby to vary the effective carrier-shifting band lengths while the levers continue in movement with the cam.

Claim 26

A device including a shifting band connected at one end to a carriage and at its opposite end to a type carrier which is shiftable relative to the carriage and is normally yieldably biased in one direction, comprising: a pair of elongated levers having one of their ends pivotally mounted in adjacent spaced relation and their opposite ends in relatively free adjacent spaced relation and provided with cam follower means; a lobed cam rotatably mounted between and engaged by said follower means and operative in rotation of the cam to effect relative pivotal swinging of said levers; a plurality of rollers supported on said levers and located in relative staggered relation to each other; a looping member located generally between and spaced from said pivoted ends of the levers; a looping roller located adjacent and spaced from said free ends of the levers; said band being looped over said looping member, said plurality of rollers and said looping roller serpentine fashion; certain of said plurality of rollers having lost motion connection with one of said levers enabling movement of the certain rollers with the levers and also enabling movement of the levers while said certain rollers are held against movement with the levers; said band normally by its tension maintaining said certain rollers for movement with said one of said levers; and means for selectively holding said certain rollers against movement with said one of said levers whereby to vary the effective carrier-shifting band lengths while the levers continue in movement with the cam.