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US 3,941,229 AGranted
Serial printing device
AssigneeIng. C. Olivetti & C., S.p.A.
InventorsRaffaele Becchi, Dario Bisone
Life of this patent
Estimating the term…
Abstract
A serial printing device comprises a type drum rotatably mounted on a carriage which can move parallely to a platen. On the periphery of the type drum are mounted a plurality of character-bearing elements urged against the drum by biasing means. A stepping motor rotates the drum for positioning a selected character-bearing element in front of the platen. A hammer is actuatable for pushing the selected character-bearing element radially outwardly relative to the drum against the action of the biasing means, and the drum is moved towards the platen simultaneously to the actuation of the hammer.
Claims16
A serial printing device comprising:
- a platen;
- a base member adjacent to said platen;
- a type drum rotatably mounted on said base member;
- a plurality of character-bearing elements;
- mounting means for mounting said plurality of elements on the periphery of said drum for radially outward movement therefrom;
- biasing means for biasing said character bearing elements against said drum;
- angularly positioning means for rotating said drum on said base member to position a selected character-bearing element in front of said platen;
- a hammer movably supported with respect to said drum to be spaced apart from the selected character-bearing element and actuatable for pushing said selected character-bearing element radially outwardly relative to said drum against the action of said biasing means;
- actuatable means for moving said drum towards said platen;
- and
- means interconnecting said hammer with said drum for actuating said hammer in response to the actuation of the actuatable means to simultaneously actuate said drum and said hammer whereby the hammer pushes outwardly for printing only the selected character when the drum moves toward the platen.
8 more elements
A serial printing device comprising:
- a platen;
- a base member;
- first and second pivot means mounted on said base member;
- a support pivotally mounted on said first pivot means;
- a type drum rotatably mounted on said support;
- a plurality of character-bearing elements;
- mounting means for removably mounting said plurality of elements on the periphery of said drum for radially outward movement therefrom;
- biasing means for biasing said elements against said drum;
- positioning means for rotating said drum on said support to position a selected character-bearing element in front of said platen;
- actuating means for pivoting said support about said first pivot to move said drum towards said platen;
- a hammer member movably supported with respect to the drum and spaced apart from the selected character bearing element and cooperative with said selected character-bearing element for moving same radially outward from said drum;
- and
- means for effecting said hammer to push said selected character-bearing element outwardly relative to said drum against the action of said biasing means when said drum moves toward said platen comprising a lever member having one end pivoted on said second pivot means, the other end connected to said member and an intermediate portion pivotably mounted on said support and wherein the distance between said first pivot means and said intermediate portions is greater than the distance between said second pivot means and said intermediate portion.
10 more elements
A serial printing device comprising:
- a platen;
- a base member;
- a type head;
- means mounting said type head on said base member for movement towards and away from the platen to define a printing position and a rest position respectively;
- actuating means for moving said type head towards said platen from said rest position to said printing position;
- biasing means for biasing said type head into said rest position;
- and
- means for damping the return movement of said type head from said printing position to said rest position under the influence of said biasing means, the damping means comprising a ratchet wheel mounted on said base member, friction means for frictionally restraining said ratchet wheel and a pawl connected to said type head and cooperative with said wheel during the return movement of said type head from said printing position to said rest position to absorb the kinetic energy of the type head developed in overcoming said friction means whereby rebounds of the type head in the rest position are prevented and the operative speed of the device may be increased.
5 more elements
A serial printing device comprising:
- a platen;
- a base member;
- a type drum;
- a shaft rotatably mounted on said base member and having one end portion connected to said drum, said one end portion including a threaded portion and a neck portion extending outwardly from said drum;
- a plurality of character-bearing bars individually pivotally mounted vertically on the periphery of said drum and each including an upper portion upwardly projecting from said drum and on which characters are embossed;
- a releasable locking member cooperative with said threaded portion of said shaft for releasably locking said drum to said shaft;
- an actuatable hammer disposed near said upper portions of said bars and above said locking member and actuatable for cooperating with said upper portions of said character bearing bars to pivot said bars and to bring said embossed characters against said platen;
- an actuating member for actuating said hammer and wherein said hammer has one end portion pivoted on said actuating member and the other end disposed near said upper portions of said bars, and an intermediate portion having a slot guided in said necked portion of said shaft and a hole larger than said neck portion;
- and
- means mounting the actuating member for movement from a rest position to an actuated position and from said rest position to an inoperative position and wherein said intermediate portion of said hammer is disengageable from said necked portion of said shaft through said hole when said actuating member is in said inoperative position to permit the unlocking of said locking member and the removal of said drum from said shaft.
7 more elements
In a serial printing device, a type head comprising:
- type drum means comprising a pair of flanges spaced apart and overlapped parallel therebetween, said flanges having a plurality of peripheral radial recesses;
- a plurality of character-bearing elements, each one of said character-bearing elements comprising a bar including a lower part having two extremities lodged in said recesses and an upper part protruding upwardly from said drum and on which at least one character is embossed;
- and
- means for removably mounting each of said elements on said type drum means comprising radial arrest means cooperating with said two extremities of said lower part of said elements for arresting the inner radial movement thereof, elastic ring means cooperating with the outer portion of said lower part between said two extremities thereof for biasing said character-bearing elements against said radial arrest means, and a hook in the lower of said two extremities of said lower part cooperating with the lower of said two flanges, said hook being disengageable from said lower flange upon urging said upper part inwardly to rotate said bar on the upper of said two flanges against the action of said elastic means to thereafter axially remove the character-bearing element from said drum means.
1 more element
Dependencies are inferred from the claim text.