Winding – tensioning – or guiding – Unwinding and rewinding a machine convertible information... – Cartridge system
Reexamination Certificate
2003-08-14
2004-11-16
Nguyen, John Q. (Department: 3654)
Winding, tensioning, or guiding
Unwinding and rewinding a machine convertible information...
Cartridge system
C360S132000
Reexamination Certificate
active
06817561
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a magnetic tape cassette such as digital video cassette (DVC).
BACKGROUND OF THE INVENTION
With a technical revolution in recent years that high density of magnetic recording medium has been realized, the magnetic tape cassettes and video tape recorders (VTR) have become compact. There are many occasions where the VTR is used outdoors to take pictures of landscapes and portraits. In order to obtain dust proofing property enough to withstand such outdoor uses, some magnetic tape cassettes have lids of two panel type or three panel type for covering a front face and a back face of the magnetic tape. There are various types of the magnetic tape cassettes and, the DVC for example includes a small size (S type), a medium size (M type), and a large size (L type).
FIG. 23
is an exploded perspective view of the DVC of the M type provided with the lid of three panel type. A cassette case of this magnetic tape cassette
310
is composed of an upper cassette half
311
and a lower cassette half
312
each of which includes a flat plate and upright walls surrounding the flat plate.
The flat plate of the lower cassette half
312
is formed with reel holding holes
313
on which a pair of reels
319
are mounted having a magnetic tape T wound around them. Reel driving shafts provided in a hardware such as VTR and so on are adapted to be inserted into the reel holding holes
313
. At a center of a forward end of the cassette case (a side opposed to a head of the hardware when the magnetic tape cassette has been loaded in the hardware), there is formed an opening
314
. The flat plate of the lower cassette half
312
is provided with tape guides
318
at both sides of the opening
314
. The surrounding walls of the lower cassette half
312
are provided with cutouts
317
for enabling the magnetic tape T which is wound around the reels
319
to pass into and out from the opening
314
at the other sides of the tape guides
318
opposite to the opening
314
. At a center of a forward end of the flat plate of the lower cassette
312
and behind the opening
314
, there is provided a central part
315
of a front wall which projects toward the upper cassette half
311
. The flat plate of the lower cassette half
312
is further provided, at both sides of the central part
315
, with lower walls
315
a
which constitute both side parts of the front wall in combination with upper walls
315
b
of the upper cassette half
311
. The opening
314
is defined by this front wall and the tape guides
318
.
To the cassette case composed of the upper cassette half
311
and the lower cassette half
312
assembled together, is attached an open/close lid
320
so as to cover the magnetic tape T which is stretched between the tape guides
318
(over the opening
314
). This open/close lid
320
consists of an outer lid (a front lid)
321
, a top lid (an upper lid), and an inner lid (a back lid)
323
.
The outer lid
321
includes a front lid plate
321
a
covering a front face of the magnetic tape T which is stretched over the opening
314
, and side plates
321
b
which extend backward from both sides of the front lid plate
321
a
. Pivotal pins
321
c
having distal end flanges are provided so as to project from inner faces of the side plates
321
b
. These pivotal pins
321
c
are rotatably held by pin holding cutouts
324
a
which are formed in pin supporting pieces
338
a
provided at front sides of both lateral walls
311
a
of the upper cassette half
311
. The pivotal pins
321
c
are rotatably engaged and held in pin holding holes which are defined by the pin holding cutouts
324
a
in the pin supporting pieces
338
a
of the upper cassette half
311
and by pin supporting pieces
338
b
of the lower cassette half
312
. The outer lid
321
can rotate around the pivotal pins
321
c
. The outer lid
321
is always urged by a lid spring
327
in a closing direction.
The top lid
322
includes an upper lid plate
322
a
covering an upper edge of the magnetic tape T which is stretched over the opening
314
, and side plates
322
b
which extend downward from both sides of the upper lid plate
322
a
. At forward sides of inner faces of the side plates
322
b
, there are provided front lid connecting pins
322
c
adapted to rotatably connect the upper lid plate
322
a
to connecting holes
321
d
of the front lid plate
321
a
. At backward sides of the inner faces of the side plates
322
b
, there are provided slide pins
322
d
which are adapted to be slidably engaged with cam grooves
325
for the upper lid which are formed in both side walls
311
a
of the upper cassette half
311
. When the outer lid
321
is opened, the top lid
322
moves backward of the cassette case while the slide pins
322
d
are moved along the cam grooves
325
for the upper lid, and the upper lid plate
322
a
is maintained in substantially parallel to an upper face of the cassette.
The inner lid
323
includes a back lid plate
323
a
covering a back face of the magnetic tape T which is stretched over the opening
314
. From both ends of an upper edge of the back lid plate
323
a
, are projected upper lid connecting pins
323
b
adapted to rotatably connect the back lid plate
323
a
to the upper lid plate
322
a
. From both ends of a lower edge of the back lid plate
323
a
, are projected slide pins
323
c
adapted to be slidably engaged with S-shaped cam grooves
326
for the inner lid which are formed on opposed faces (inner faces) of a pair of the tape guides
318
provided on the lower cassette half
312
. The upper lid connecting pins
323
b
follow the movement of the top lid
322
when the outer lid
321
is opened. Along with the movement of the upper lid connecting pins
323
b
, the slide pins
323
c
are caused to slide inside the cam grooves
326
for the inner lid.
When this magnetic tape cassette
310
has been loaded in the hardware, the side plates
321
b
of the outer lid
321
are pushed upward against an urge of the lid spring
327
by means of lid opening pins (not shown) provided on the hardware. In association with the lid opening motion of the outer lid
321
, on this occasion, the top lid
322
and the inner lid
323
perform their lid opening motions. When the magnetic tape cassette
310
has been taken out from the hardware, the lids
321
,
322
and
323
will perform the lid closing motions by the urge of the lid spring
327
.
FIG. 24
is an enlarged view showing an area around the tape guides
318
. As shown in
FIG. 24
, on an inner face of one of the tape guides
318
which is opposed to the other tape guide (not shown), there is formed the cam groove
326
for the inner lid in which the slide pin
323
c
of the aforesaid inner lid
323
is adapted to slide. Also on the inner face of the tape guides
318
, there is provided a projection
328
which is formed with a position detecting hole (a reference hole) of the magnetic tape cassette.
By the way, the upper cassette half
311
and the lower cassette half
312
of this magnetic tape cassette are formed by injection molding. In order to prevent occurrence of molding sinks on a guide face
318
a
of the tape guide
318
on occasion of the injection molding, molding sink preventing recesses must be formed on a back face (the inner face)
318
b
of the guide face
318
a
. In the tape guide
318
having such a shape as shown in
FIG. 24
, a molding sink preventing recess
329
a
is formed in an area of the back face
318
b
of the tape guide
318
in front of the cam groove
326
for the inner lid (outside of the cassette case). Also in an area of the back face
318
b
in rear of the cam groove
326
for the inner lid (inside of the cassette case) and above the projection
328
formed with the position detecting hole
328
a
, there is formed a molding sink preventing recess
329
b
. Still further, in an area of the back face
318
b
of the tape guide
318
in rear of the cam groove
326
for the inner lid and in front of the projection
328
formed with the position detecting hole
328
a
, t
Ashikawa Teruo
Hiraguchi Kazuo
Onmori Shozo
Takano Atusi
Fuji Photo Film Co. , Ltd.
Nguyen John Q.
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