JPS6213208Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a winder-type demagnetizer that simultaneously demagnetizes and rewinds the magnetic tape in a cassette.

Tape recorders have rewind and erase functions. However, rewinding and erasing may be required separately from the tape recorder. In that case, a dedicated demagnetizer and rewinder are used.

The purpose of the present invention is to provide a winder-type demagnetizer that has a rewinding function and a demagnetizing function, and in particular automatically performs the necessary operations in connection with loading a cassette, attaching and detaching a degaussing head, and opening and closing a case cover. It is characterized by a configuration in which it is activated automatically.

EMBODIMENT OF THE INVENTION Hereinafter, the winder-type demagnetizer of the present invention will be specifically explained based on an embodiment shown in the drawings.

The winder type demagnetizer 1 has a box-shaped case 2, as shown in FIG _.
and a lid part _2b , and has a built-in motor, control circuit, etc. (not shown) inside, and a step part 3 on one side of the top surface, and a storage recess 5 for the cassette 4 on this step part 3. . The storage recess 5 of the cassette 4 has a pair of drive-side shaft 6 and driven-side shaft 7 at approximately central left and right positions, a recess 8 at the center of the front, and a cassette presser at the back. 9, and further hold the upper plate 10 of the case 2 at one end.
A degaussing head housing section 12 is formed together with a part of the head. The recess 8 is a portion that accommodates the raised portions 13 on the upper and lower surfaces of the cassette 4, and has a first switch 14 for detecting the presence of the cassette 4, and an arrow 37 that indicates the rewinding direction of the magnetic tape 15. It is equipped with The stepped portion 3 has a groove 16 corresponding to the recess 8 at the front thereof, into which the degaussing head 11 is mounted. This groove 16 is
Although it is open at the front, a stopper 17 is formed on the side of the storage recess 5, so it is in a half-open state. The degaussing head 11 has an inverted T-shaped mounting leg 18 which is removably fitted into the groove 16 and forms a head case 19 at the upper part. This head case 19 accommodates a permanent magnet 20 for demagnetization and supports a pair of pins 21 for guiding the magnetic tape 15. The mounting state of the mounting leg 18 is detected by a detection switch 22 provided at the bottom of the groove 16, and this detection switch 22 lights up a degaussing indicator lamp 23 provided on the top plate 10 of the case 2. To make it easy to confirm degaussing operation from the outside. In addition, head case 1
Stops 24 are formed on the left and right sides of 9 to make it easier to pinch. Further, the upper surface of the storage recess 5 is covered with a cover 25. The cover 25 is rotatably attached to the back of the case 2 with a pin 26, and the lower end surface of the cover 25 is connected to the second switch 2 on the upper surface of the stepped portion 3 when the cover 25 is closed.
Close to 7. The cover 25 has a light source 28 such as a light emitting diode at a position corresponding to the shaft 7 on the driven side on the inside in order to detect the presence of the magnetic tape 15 on the driven side. This light source 28
is connected to a power source (not shown) inside the case 2 through a cord 29 and a flexible connector 30. The luminous flux of this light source 28 is transmitted from the corresponding light receiving hole 31 of the storage recess 5 to the light receiving element 3 inside the case 2.
It is possible to reach 2. The light receiving element 32 and the light source 28 constitute a detection switch 46.
The bulging portion 40 of the cover 25 corresponding to the head storage portion 12 extends outward in an arc shape corresponding to the shape of the head storage portion 12. Further, the arc-shaped recess 41 at one end of the case 2 is used as a hook for opening the cover 25 in a closed state. Both the cover 25 and the case 2 are manufactured by plastic molding, and the cover 25 is preferably made of transparent acrylic resin. In the case of a transparent cover 25, a shielding plate 38 is required to block external light.

As shown in the figure, the cassette 4 is a standard product, and stores the magnetic tape 15 wound around a pair of reels 43 and 44 with a portion of the magnetic tape 15 exposed through a window 45 on the front surface.

Next, the control circuit 36, as shown in FIG.
The first switch 14 and the second switch 2 are connected to the power supply 34.
7. A motor 33 and a contact 35 are connected in series, and a light source 28 such as a light emitting diode and a resistor 39 are connected in series to the motor 33, and a light receiving element 3 such as a phototransistor is connected in series.
2 and a relay 38 for driving a contact 35 are connected in parallel, and a detection switch 22 and a degaussing indicator lamp 23 such as a light emitting diode are connected in series to a power supply 34.

Next, the operation will be explained.

First, when simply rewinding the magnetic tape 15, the cassette 4 is stored in the storage recess 5, and the shafts 6, 7 are
are inserted into the holes of the reels 43 and 44 of the cassette 4. At this time, the cassette presser 9 presses the cassette 4 forward and sets the position of the cassette 4 at a predetermined position. At this point, the first switch 14 is pushed down by the cassette 4 and turned on. When the cover 25 is closed, the second switch 27 is pressed and turned on as the cover 25 is closed. Therefore, the power supply 34 is connected to the first switch 1.
4 and the second switch 27 are connected to a motor 33 for driving the shaft 6, and the motor 33 rotates and drives the shaft 6. Therefore, the reel 43 of the cassette 4 rotates clockwise in the figure, and the magnetic tape 15 is wound up from the reel 44.
Detection switch 46 for light source 28 and light receiving element 32
are connected in parallel to the motor 33 in the control circuit 36 of the motor 33, so they enter the operating state at the same time as the motor 33 starts, and the light source 2
8 emits a light beam toward the light receiving element 32, but it does not reach the light receiving element 32 because of the glare from the magnetic tape 15 wound on the reel 44. When the rewinding is completed, the light beam from the light source 28 no longer illuminates the magnetic tape 15 on the reel 44 side, and therefore enters the light receiving element 32 through the light receiving hole 31. At this time, the light receiving element 32 drives the relay 38, opens the normally closed contact 35 interposed in the power supply circuit of the motor 33, and stops the power supply. Therefore, the rewinding operation is automatically stopped upon completion of rewinding. If you open the cover 25 in this state,
The second switch 27 also stops the power supply to the light source 28.

Next, a case where demagnetization is performed at the same time as rewinding will be explained. In this case, the demagnetizing head 11 is fixed by inserting its mounting leg 18 into the groove 16. At this time, the stopper 17 restricts the insertion position of the mounting leg 18 and causes the permanent magnet 20 to correctly face the window 45. At this time, the detection switch 22 is turned on, so the degaussing display lamp 23 lights up. This allows the user to confirm the erasing operation and
Be prepared for accidental deletion. After doing this, when the cassette 4 is placed in the storage recess 5 in the same manner as described above and the cover 25 is closed, the magnetic tape 15 runs in the direction of the arrow 37. At this time, the demagnetizing head 11
A strong DC magnetic field is applied to the magnetic tape 15 through the window 45 to saturate the magnetic tape 15 and erase the recording. When the degaussing operation is completed, the motor 33 automatically stops, as in the rewinding operation described above.

Note that the degaussing head 11 is normally equipped with permanent magnets 20 in two stages, upper and lower, and erases the upper and lower tracks of the magnetic tape 15 at the same time. It is also possible to erase only one track. Of course, when not in use, the degaussing head 1
1 is stored inside the head storage section 12.

The present invention has the following effects.

(1) Since the demagnetizing head is detachable from the case, the rewinding function or the demagnetizing function can be selectively obtained.

(2) The first switch and the second switch start the drive shaft only when the cassette is installed in the predetermined position and the cover is closed, so the above function is automatically obtained, and each time the switch is operated etc. are not required.

(3) Since the detection switch automatically stops the drive-side shaft when rewinding or degaussing is completed, there is no need to monitor during operation, and waste of power (battery) can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the winder type demagnetizer of the present invention, and FIG. 2 is a circuit diagram of a control circuit. DESCRIPTION OF SYMBOLS 1... Winder type demagnetizer, 2... Case, 4... Cassette, 5... Storage recess, 6... Drive side shaft, 7... Drive side shaft, 11... Demagnetizing head, 14... First switch, 15... Magnetic tape , 25...Cover, 27...
Second switch, 46...detection switch.

Claims (1)

[Scope of utility model registration request] A cassette storage recess is formed on the top of the case,
A pair of drive-side shafts and driven-side shafts are provided in the storage recess, and a degaussing head is removably attached to the central position of the front surface of the storage recess, and a first degaussing head is provided to detect the presence of a cassette in the storage recess. A switch and a second switch are respectively provided to detect the closed state of the cover for the case and rotate the shaft on the drive side, and further detect the presence of the magnetic tape of the cassette on the side to be wound up between the storage recess and the cover. A winder-type demagnetizer characterized by being provided with a detection switch that detects and stops the drive-side shaft when rewinding of the magnetic tape is completed.