Winding – tensioning – or guiding – Unwinding and rewinding a machine convertible information... – With particular drive
Reexamination Certificate
1999-02-24
2001-07-03
Walsh, Donald P. (Department: 3653)
Winding, tensioning, or guiding
Unwinding and rewinding a machine convertible information...
With particular drive
C242S356000, C242S356700
Reexamination Certificate
active
06254024
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotational load applying mechanism for a tape recorder. This rotational load applying mechanism for a tape recorder is designed in such a way that the shaft of a rotation transmission gear and a rotary arm member which rotates together with that shaft are formed of plastic, and an elastic fork-shaped holder is provided at the distal end of the plastic arm member, so that as the holder holds the outer surface of the rotation transmission gear, a rotational load is applied to the rotation transmission gear. The arm member and the rotation transmission gear are both formed of plastic to suppress wear-out caused by rubbing friction between both members as much as possible.
2. Description of the Related Art
In an ordinary rotational load applying mechanism for a tape recorder, as shown in
FIG. 10
, a metal spring body
17
like a leaf spring or coil spring is assembled at the same time as a rotation transmission gear
10
of plastic is fitted over a rotary shaft
12
to apply a rotational load to the rotation transmission gear
10
.
When the metal spring body
17
like a leaf spring or coil spring is fitted on the shaft support of the plastic rotation transmission gear
10
to acquire a rotational load, it is difficult to acquire a reliable rotational load with the leaf spring or the use of the spring coil inevitably enlarges the rotational load applying mechanism. The frictional load between the metal spring body
17
and the plastic rotation transmission gear
10
would cause plastic, not metal, to wear out, resulting in an undesirable variation in rotational load.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to improve the structure of the conventional rotational load applying mechanism for a tape recorder by employing a plastic-metal friction avoidable structure in applying a rotational load to a rotation transmission gear.
To achieve the above object, according to this invention, a rotational load applying mechanism for a tape recorder having a rotation transmission gear for rotating a reel base in engagement with a gear of the reel base, causing a rotary shaft of the rotation transmission gear to move with operational force acquired by a rotational load of the rotation transmission gear, comprises a rotary arm member made of plastic and rotatable together with the rotary shaft of the rotation transmission gear, and an elastic holder, formed on the arm member, for holding, with a pressure, an outer surface of a boss to be a bearing for the rotary shaft of the rotation transmission gear, thereby applying the rotational load to the rotation transmission gear.
REFERENCES:
patent: 3610553 (1971-10-01), Matsuyama
patent: 3785586 (1974-01-01), Engert et al.
patent: 4422114 (1983-12-01), Sugihara
patent: 4547823 (1985-10-01), Ri et al.
patent: 4935831 (1990-06-01), Shimbo
patent: 4956731 (1990-09-01), Yoshimura
patent: 5041930 (1991-08-01), Tsuchiya
patent: 5788175 (1998-08-01), Hwang
patent: 6089488 (2000-07-01), Shimbo et al.
Greenblum & Bernstein P.L.C.
MEC Co. Ltd.
Pham Minh-Chau
Walsh Donald P.
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