US 6,145,769 AGranted

Tape winding devices

AssigneeCasio Computer Co., Ltd.

InventorsYasushi Shiraishi, Yoshiaki Mochizuki

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Abstract

A thin ribbon cassette (16) is a set on a tape winding device and its vertical-direction position is fixed by a position restricting member (18) provided on a back of a cover and for an apparatus body. When the ribbon cassette (16) is thin in correspondence to a narrow width of an ink ribbon (15), a quantity of lowerig a ribbon winding top (5) engaged with a reel (16-1) of the cassette (16) is small. The biasing force of a clutch spring (7) which is compressed depending on the quantity of lowering of the ribbon winding top (5) is small, the force of a winding driver gear (6) which presses a clutch plate (4-1) through a felt member (12) is small, the frictional force of the felt member (12) is small, and the torque of the rotational shaft (4) is small. This torque is just suitable for winding a long and narrow ink ribbon having a corresponding small tensile strength. When a thicker ink ribbon cassette (22) is set on the apparatus body, the quantity of lowering of the ribbon winding top (5) is large, and the biasing force of the clutch spring (7) is correspondingly large, so that the torque of the rotational shaft (4) is large in correspondence to a long wide and ink ribbon (21).

Claims13

Dependent claims

A tape winding device provided on an apparatus body and engaged with a long tape-like material winding reel of a tape cassette set on the apparatus body for transmitting a drive force from a drive source of the apparatus body to the reel, comprising:

a first rotating body engaged with the reel for driving the reel in a winding direction;
a second rotating body engaged with the reel for driving the reel in said winding direction;
a first rotational shaft having a first support which non-rotatably thrust-fits to said first rotating body and having a first abutting portion which abuts slidably on a first frictional member;
a second rotating shaft rotatably fitted over said first rotational shaft and having a second support which non-rotatably thrust-fits to said second rotating body and having a second abutting portion which abuts slidably on a second frictional member;
a relay member pressed against said first abutting portion through said first frictional member and pressed against said second abutting portion through said second frictional member for transmitting the drive force from the drive source of the apparatus body to said first and second rotational shafts;
and
a biasing member disposed between said relay member and said second rotating body for separating said relay member and said second rotating body from each other and for biasing said relay member against said first and second abutting portions through said first and second frictional members.

4 more elements

Dependencies are inferred from the claim text.