Dynamic magnetic information storage or retrieval – Miscellaneous
Reexamination Certificate
1999-06-22
2001-04-03
Tupper, Robert S. (Department: 2754)
Dynamic magnetic information storage or retrieval
Miscellaneous
Reexamination Certificate
active
06212039
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mode shifting device for shifting normal and reverse modes in an automatically reversing type tape player. More specifically, the present invention relates to a mode shifting device for an automatically reversing type tape player, in which during the actuation of a shifting lever, the system can be quickly restored to the play mode after the lock release by a solenoid regardless of the normal or reverse mode, and the structure of a cam gear for shifting the modes is simplified.
2. Description of the Prior Art
Generally, in the automatically reversing type tape players, a pair of capstans are mutually facingly installed at both sides of the head base. Further, a pair of pinch rolls are installed to guide the advancing of the tape in the directions of the capstans. The pinch rolls move alternately in the directions of the capstans, and thus, the advancing direction of the tape is reversed. The reproducing magnetic head rotates by being switched in accordance with the advancing direction of the tape. Here, the shifting of the modes such as normal and reverse resorts to the force of a solenoid.
A conventional mode shifting device for a tape player is disclosed in Japanese Patent Application Laid-open No. Hei-7-312001, and this device is illustrated in FIG.
1
.
As schematically illustrated in
FIG. 1
, the mode shifting device includes: a head base
110
for carrying a magnetic head
120
; a rotor
130
for being driven by a motor so as to carry the head base
110
; a locking member
140
for locking the rotor
130
upon arriving of the head base
110
at a certain position; a solenoid
150
for locking and releasing the locking member
140
; and a shifting member
160
for laterally moving in accordance with the actuation of the solenoid
150
.
In this mode shifting device, the locking member
140
is locked and released in accordance with the actuation of the solenoid
150
, while the head base
110
is carried in accordance with the revolutions of the rotor
130
. Thus the normal mode is shifted to the play mode. A guide pin P of the shifting member
160
which is installed at the lower portion of the head base
110
is contacted with branching cams
132
and
134
of the rotor
130
to shift to first and second positions in accordance with the normal and reverse modes, thereby realizing a shifting. Although the drawing does not show, guide cams are disposed adjacently to the branching cam
134
, for guiding the guide pin P of the shifting member
160
.
Accordingly, in the above described conventional mode shifting device for the tape player, the guide pin P of the shifting member
160
is switched to the first position (normal mode) or to the second position (reverse mode) by the branching cam
134
of the rotor
130
in accordance with the actuation of the solenoid
150
. During the actuation of the locking member
140
which is interlocked to the solenoid
150
, the locking is released with the result that the guide pin P moves along the respective guide cams to the branch position of the branching cam
134
.
However, in the above described conventional mode shifting device for the tape player, after carrying out the normal or reverse mode, the guide pin P of the shifting member
160
moves along the guide cams during the actuation of the locking member
140
which is driven by the solenoid
150
. Accordingly, the guide pin P of the shifting member
160
moves a long distance, and particularly, when carrying out the reverse mode, the displacement of the guide pin P is very long. Therefore, the tape player cannot perform the mode shifting action quickly, and therefore, the guide pin P pivots continuously up to the point where the mode shifting is completed.
Further, the guide cams are separately installed for the respective normal and reverse modes, and therefore, the cam structure of the rotor
130
becomes complicated, thereby making the manufacture very difficult.
Further, the solenoid
150
and the locking member
140
which drives the guide pin P of the shifting member
160
actuate in a close contact to each other. Therefore, the load of the solenoid
150
becomes heavy, and therefore, the solenoid
150
cannot actuate efficiently, while the life expectancy of the solenoid
150
is shortened.
SUMMARY OF THE INVENTION
The present invention is intended to overcome the above described disadvantages of the conventional technique.
Therefore it is an object of the present invention to provide a mode shifting device for a tape player, in which the structure of the cam gear is simplified so as to facilitate the manufacture, and during the execution of the play mode, the play mode can be quickly shifted regardless of the normal and reverse modes, thereby making the shifting of the modes quick.
It is another object of the present invention to provide a mode shifting device for a tape player, in which the actuation load of the solenoid for driving the shifting lever is alleviated, thereby making the actuation of the solenoid efficient, and extending the life expectancy of the solenoid.
In achieving the above objects, the mode shifting device for a tape player according to the present invention includes: a head base for carrying a magnetic head; a cam gear rotatably installed for carrying the head base; a locking lever for locking the cam gear during the advancement of the head base to a certain point, so as to carrying out a mode actuation; a solenoid for intermittently driving the locking lever; a direction shifting lever for carrying out a direction reversal in accordance with intermittent actuation of the locking lever; and a guide means for branching the path of the shifting lever to a third position along a side of a branching cam so as to make the shifting lever move to first and second positions during the driving of the cam gear, whereby a quick shifting is carried out to a play mode.
In another aspect of the present invention, the mode shifting device for a tape player according to the present invention includes: a head base for carrying a magnetic head; a cam gear rotatably installed for carrying the head base; a locking lever for locking the cam gear during the advancement of the head base to a certain point, so as to carrying out a mode actuation; a solenoid for intermittently driving the locking lever; a direction shifting lever for carrying out a direction reversal in accordance with intermittent actuations of the locking lever; and at least a guide means installed at a side of a branching cam so as to make the shifting lever move to first and second positions during the driving of the cam gear, for carrying out a play mode, the guide means having a guide projection.
REFERENCES:
patent: 4547823 (1985-10-01), Ri et al.
patent: 4638386 (1987-01-01), Takamatsu
patent: 4791505 (1988-12-01), Takai et al.
patent: 5499151 (1996-03-01), Lee et al.
patent: 5729402 (1998-03-01), Chiou et al.
patent: 07312001 (1995-11-01), None
Renner , Otto, Boisselle & Sklar, LLP
Samsung Electro-Mechanics Co. Ltd.
Tupper Robert S.
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