Ink ribbon feed mechanism
AssigneeOki Electric Industry Co., Ltd.
InventorsMasao Sasaki, Yoshihisa Fukurohata
Life of this patent
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Abstract
A mechanism for feeding an ink ribbon comprises a pair of ratchet wheels for taking up the ink ribbon, a feed pawl for rendering an intermittent movement to said ratchet wheels, a lever for preventing the backward movement of said ratchet wheels, a reverse mechanism for said ink ribbon, wherein a stopper which engages or disengages with said supply ratchet wheel in response to the movement of said lever is provided, thereby, through preventing the slack of the ink ribbon which occurs when the ink ribbon is taken up, the feeding of the ink ribbon is stabilized and the printing quality is improved.
Claims8
In an ink ribbon feed mechanism comprising a first ratchet wheel serving to supply an ink ribbon and a second ratchet wheel serving to take-up said ink ribbon when said ink ribbon is moved in a first direction, a feed pawl operatively associated with said ratchet wheels and supplying an intermittent movement thereto to move said ink ribbon, and a lever for preventing backward movement of said second ratchet wheel, an improvement comprising a first stopper means operatively connected with said lever to engage said first ratchet wheel to prevent said first ratchet wheel from forward movement while said lever prevents backward movement of said second ratchet wheel.
Dependencies are inferred from the claim text.