Winding – tensioning – or guiding – Unwinding and rewinding a machine convertible information... – Cartridge system
Reexamination Certificate
2001-12-14
2004-07-06
Rivera, William A. (Department: 3654)
Winding, tensioning, or guiding
Unwinding and rewinding a machine convertible information...
Cartridge system
C242S613000, C242S613100
Reexamination Certificate
active
06758428
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a tape reel for use in a magnetic tape cassette such as a digital video cassette (DVC). In particular, the present invention relates to a structure for improving a supersonically welding of a welding boss of a tape reel, a structure for improving the winding shape of a magnetic tape to be wound around a tape reel, a structure for securing the dustproof property of a magnetic tape cassette when not in use as well as preventing the deformation of a lower flange of a tape reel, a structure for preventing a magnetic tape from being damaged due to its contact with a tape reel, and a structure having a characteristic hub.
Also, the invention relates to a magnetic tape take-up device for winding a magnetic tape around a tape reel and, in particular, to a structure for fixing the winding shape of a magnetic tape with the inner surface of an upper flange of a tape reel as a reference.
RELATED ART
Generally, in audio equipment and video equipment, there is often used a magnetic tape cassette structured such that a magnetic tape wound around a pair of tape reels is runnably held within a cassette half to thereby execute recording and reproduction.
Referring now to
FIG. 20
, conventionally, for example, as a magnetic tape cassette which is used as a DVC (digital video cassette), there is known a magnetic tape cassette
130
in which a pair of tape reels
131
with a magnetic tape t wound therearound are rotatably supported within a lower cassette half
133
making a pair with an upper cassette half
132
.
On both sides of an opening
134
formed on this side in
FIG. 20
of the lower cassette half
133
, there are disposed tape guides
135
respectively. The two tape guides
135
respectively guide the magnetic tape t which is fed out from one tape reel
131
and is taken up around the other tape reel
131
, and allow the magnetic tape t to pass through a given position in the opening
134
.
Also, on the rear side of the lower cassette half
133
, there is disposed a reel lock member
139
having a tape reel securing arm
138
. The reel lock member
139
is energized by a compression coil spring
140
to bring the tape reel securing arm
138
into engagement with two engaging teeth
141
respectively formed on the outer peripheries of the two tape reels
131
, thereby preventing the unprepared rotation of the respective tape reels
131
. This can prevent the wound magnetic tape t from loosening.
On the upper cassette half
132
, there are mounted an outer lid
150
for covering the opening
134
of the lower cassette half
133
, an upper lid
151
and an inner lid
152
in such a manner that they can be freely opened and closed.
On the two side plates
153
of the outer lid
150
, there are projectingly provided lock pins
154
, respectively. The two lock pins
154
are respectively secured to their associated lid locks
155
which are rotatably disposed on the lower cassette half
133
. By the way, reference character
156
designates a lid spring to be mounted on the rotary shaft of the outer lid
150
.
The tape reels
131
are respectively structured such that mutually opposing upper and lower flanges
142
and
143
are fixed with a given position relationship between them.
That is, in each tape reel
131
, a pivot
147
projectingly provided on a hub
145
of the lower flange
143
is fitted into a pivot hole
146
formed in the central portion
144
of the upper flange
143
. Also, a welding boss
148
, which is provided on and projected from the hub
145
of the lower flange
143
at a position distant in the radial direction from the pivot
147
, is fitted into a welding boss hole
149
formed in the central portion
144
of the upper flange
142
at a position corresponding to the welding boss
148
. In this state, in case where a welding horn (not shown) is contacted with the substantially central portion of the leading end face (in
FIG. 20
, the upper end face) of the welding boss
148
, the welding boss
148
can be welded supersonically. As a result of this, the mutually opposed upper and lower flanges
142
and
143
can be fixed with a given position relationship between them.
Now, referring to
FIGS. 20 and 21
, on the bottom surface
143
a
of the lower flange
143
that is situated on the opposite side of the hub
145
, there is disposed a reference ring
157
which provides a reference for working using a metal mold. The reference ring
157
is present at a position which is more distant in the radial direction than the welding boss
148
. The surface
157
a
of the reference ring
157
is used as a receiving surface for receiving the welding boss
148
when it is welded supersonically, because the surface
157
a
makes it possible to facilitate the grasping of the dimensional relationship. That is, in case where the surface
157
a
of the reference ring
157
is contacted with a welding receiving base (not shown) when the welding boss
148
is welded supersonically, the surface
157
a
allows the welding receiving base to receive pressures applied from the welding horns and vibrations caused by the supersonic oscillation.
In the above-mentioned conventional magnetic tape cassette
130
, the surface
157
a
of the reference ring
157
is used as the receiving surface when the welding boss
148
is supersonically welded. Due to this, the oscillation energy of the supersonic waves from the welding horns is in part lost due to the resonance of the components of the tape reel
131
existing from the welding boss
148
to the reference ring
157
, resulting in the low transmission efficiency of the oscillation energy of the supersonic waves from the welding horn to the welding boss
148
. In case where the transmission efficiency of the oscillation energy of the supersonic waves is low, it takes time to weld the welding boss
148
, which makes it necessary to extend the oscillation time of the supersonic waves, resulting in the poor mass-production aptitude and in the poor welding stability. Further, in case where the welding stability is poor, there is a fear that the mutually opposing attitudes of the upper and lower flanges
142
and
143
can be out of balance, giving rise to the vibratory motion of the surfaces of the tape reel
131
when it is rotated.
It is a first object of the invention to provide a tape reel for use in a magnetic tape cassette which can enhance the transmission efficiency of the oscillation energy of the supersonic waves to the welding boss to thereby be able to shorten the time necessary for supersonic welding of the welding boss as well as to enhance the welding stability.
Next, referring to
FIG. 22
, the inner surface (lower surface) of the upper flange
142
is formed as a sloping surface
142
b
which gradually slopes upward from the base end portion (in
FIG. 22
, the upper end portion a) of the side wall
145
b
of the hub
145
toward the radial-direction outer side (in
FIG. 22
, the right side) of the upper flange
142
. Also, the inner surface (upper surface) of the lower flange
143
is formed as a sloping surface
143
b
which gradually slopes downward from the base end portion (in
FIG. 22
, the lower end portion b) of the side wall
145
b
of the hub
145
toward the radial-direction outer side (in
FIG. 22
, the right side) of the lower flange
143
.
However, in case where such slopes are formed on the whole areas of the lower surface of the upper flange and the lower surface of the lower flange, it is true that, when the magnetic tape is wound, it can be wound easily; but, there is also a fear that the magnetic tape can be vibrated in the vertical direction.
In case where a given period of time passes after the winding operation of them magnetic tape is started, the rotation speed of the reel drive means and the tape tension become constant, so that the magnetic tape runs stably and thus there is no fear that it can be vibrated in the vertical direction. However, at the beginning of the winding operation of the magnetic tape, the rotation speed of the reel drive means incr
Asano Katsuki
Hashimoto Akihiro
Hiraguchi Kazuo
Naito Hiroyuki
Nishiyama Shigeru
Fuji Photo Film Co. , Ltd.
Rivera William A.
LandOfFree
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