High speed serial printing device for typewriters, teleprinters, calculating machines, accounting machines and the like

Claim 1

In a high speed serial printing device comprising a frame, a horizontal shaft rotatably mounted on said frame, a drum secuRed to said shaft and continuously rotating therewith, said drum carrying circumferentially a plurality of rows of types, a carriage movable parallel to said shaft, means for moving said carriage across said rows of types, and a hammer carried by said carriage and engageable at predetermined instants for successively effecting the printing on the fly of the type, the improvement comprising: a universal bar coextensive with the path of movement of said carriage and parallel to said shaft, said universal bar being movable between a first position slightly spaced from and out of engagement with said hammer and a second position in engagement with said hammer to cause said hammer to effect a printing stroke, bridge means pivotally mounted on said frame, said universal bar being attached to said bridge means at a point spaced from the pivot axis of said bridge means, and being movable on said bridge means between said first and second positions, means normally holding said universal bar in said first position, and an electromagnet having first and second elements positioned centrally with respect to the path of movement of said carriage, said first element being mounted on said frame and said second element being carried by a member mounted on said bridge means and spaced from the pivot axis of said bridge means, said electromagnet when energized pivoting said bridge means to move said universal bar from said first position to said second position, thereby causing said hammer to effect a printing stroke.