JPS6224346Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a tape winding device for fast forwarding a tape-like object such as a magnetic tape of a magnetic tape cartridge from the tape winding body of one reel to the tape winding body of the other reel. It is related to.

For example, the applicant has already proposed the following tape winding device for magnetic tape cartridges.

In other words, a rotation detection switch that opens and closes in response to the rotation of the tape supply reel shaft is connected in series with a DC power supply, and a pulsating signal from a capacitor charged via the detection switch is passed through a low-pass filter and formed by a storage capacitor. At the same time, the output signal of the integrating circuit is applied to the base of a transistor that controls a motor for driving the take-up reel shaft, so that the rotational speed of the supply reel shaft is maintained constant at the end of tape winding. , the tape running speed is gradually reduced, which has the advantage that the impact force at the end of the tape is reliably weakened at the end of tape running without increasing the winding time, and the tape can be wound smoothly. It has the following.

By the way, in the above device, the normally open contact type start switch inserted between the DC power source and the rotation detection switch is a push button that can be pushed into the magnetic tape cartridge mounting surface of the main body case. When a magnetic tape cartridge is placed on the surface mentioned above, the push button will be lowered by its own weight, and the start switch will be turned on automatically to turn on the power.
I'm starting to do that. This means that even if the magnetic tape cartridge is placed stably on the mounting surface, if the magnetic tape cartridge shakes due to mechanical vibration against the main body case, the contact of the start switch will become unstable. , and the tape winding operation cannot be performed smoothly.

Therefore, this invention includes a rotation detection switch that is connected in series to a DC power source via a push-button start switch and opens and closes in response to the rotation of the tape supply reel shaft during tape winding, and a rotation detection switch connected in series to this detection switch. a capacitor that is connected to the capacitor and generates a pulse signal by repeatedly charging and discharging through the opening and closing operations, and a tape winding that is connected in series to the power source via the start switch and a switching transistor that is controlled by the pulse signal from the capacitor. The self-holding circuit is connected in parallel to the start switch and maintains the closed state of the switch, and the voltage supply to the self-holding circuit is controlled via the switching transistor. By configuring it so that the start switch is turned on, it is possible to self-hold the start switch, which eliminates the instability of the switch caused by the weight of the cartridge and the movement of the cartridge during tape winding, and also prevents the start switch from turning on when winding is completed. This system is designed to ensure that the power supply is stopped.

In particular, with conventional switches, even after winding is complete, the switch remains turned on unless the cartridge is removed, and for this reason, the conventional switch is used directly in the circuit between the power supply and the motor. However, since the present invention can be inserted directly into the circuit between the power supply and the motor, the power supply can be reliably stopped when winding is completed, and the supply can be stopped easily. Since the switching transistors are used to stop and control the power supply to the motor, the winding operation can be performed simultaneously and stably without any timing delays on the self-holding circuit side.

An embodiment of this invention will be described below with reference to the drawings.

In Fig. 1, 1 is a main body case made of synthetic resin, etc., and on the top surface of this main case 1,
A recessed placing portion 3 is formed for placing the magnetic tape cartridge 2 thereon. This mounting section 3
A recessed portion 5 into which the front thick portion 4 of the magnetic tape cartridge 2 fits is formed at the front end of the magnetic tape cartridge 2 .

6 and 7 are rotating shafts that are rotatably supported by the main body case 1 and protrude from the main surface of the mounting section 3;
These rotating shafts 6 and 7 are adapted to be respectively engaged with a supply reel 9 and a take-up reel 10 of the magnetic tape 8 housed in the magnetic tape cartridge 2, and correspond to the supply reel 9. The rotating shaft 6 is configured as a tape supply reel shaft, and the rotating shaft 7 corresponding to the take-up reel 10 is configured as a tape winding shaft.

Push buttons 11, 12, and 13 are configured to operate a tape winding start switch, a tape degaussing switch, and a tape stop switch, respectively.

FIG. 2 is an electrical circuit diagram of the tape winding device of this invention. In the figure, 21 is a power battery, 22 is a motor, and 23 is fixed to the tape supply reel shaft 6 and opens and closes according to the running of the tape 8. The operating rotation detection switch 24 is a start switch inserted between the power supply battery 21 and the rotation detection switch 23, and is a normally open contact type switch. 25
is an electrolytic capacitor connected in parallel to both ends of the battery 21, and the motor 2 is connected to both ends of this capacitor 21.
2 and a series circuit of switching transistor 26 are connected in parallel. 27 is a transistor Darlington connected to the transistor 26;
8 and 29 are resistors, and 30 is a storage capacitor, forming an integrating circuit 31 that controls the base of the transistor 27. These capacitors 2
5 and transistors 26 and 27 constitute a drive circuit for the motor 22. Reference numeral 32 denotes a starting pulse generation circuit, which includes, for example, resistors 33, 34, a diode 35, and a capacitor 36. 37
is a starting pulse holding circuit, and this pulse holding circuit 3
7 consists of resistors 38, 39, a diode 40, and a capacitor 41, and a capacitor 4 is provided between the starting pulse holding circuit 37 and the pulse generating circuit 32.
2 and a variable resistor 43 are connected. Further, a rotation detection switch 23 consisting of a pulse generating cylinder 45 attached to the tape supply reel shaft 6 and contact pieces 46 and 47 is connected to the starting pulse holding circuit 37.
A stop switch 48 for temporarily stopping the tape 8 is connected in parallel to the detection switch 23.

Reference numeral 49 denotes a self-holding circuit for keeping the start switch 24 closed. The self-holding circuit 49 is thus supplied with voltage through the switching transistor 26 together with the control of the motor 22 at the same time.

52 is a degaussing head, 53 is a switching element such as a thyristor connected in series to the degaussing head 52, 54 is a degaussing switch, 55 is a normally open contact type switch linked to the start switch 24,
It is inserted between the degaussing switch 54 and the gate pole of the thyristor 53.

Next, the operation of the above configuration will be explained.

The magnetic tape cartridge 2 is placed on the mounting portion 3 of the main body case 1, and the rotating shafts 6 and 7 are fitted and locked into the respective reels 9 and 10, respectively.

When the start switch 24 is closed, the battery 21
The power supply current flows between the emitter and base of the transistor 27 and through the diode 35 as the charging current i ₁ of the capacitor 36 as shown by the arrow. As this charging current _i1 flows, the transistors 27 and 26 become conductive in sequence, so that the motor 2
A power supply current _i1 flows through the motor 22, and the motor 22 starts.

At this time, since the reed switch 51 is energized and the reed switch 50 is closed, the power supply current _i2 continues to flow even if the start switch 24 is released. capacitor 36
is charged, the current i ₁ flowing through this capacitor 36 stops, and this starting pulse generation circuit 3
Operation 2 ends.

If the motor 22 is started, this motor 2
The second pulley (not shown) starts rotating, the magnetic tape 8 starts running due to the rotation of the take-up reel 10, and along with this, the supply reel 9 starts rotating. Therefore, the rotation detection switch 23 starts operating and intermittently turns on and off the voltage supplied to the starting pulse holding circuit 37 of the DC power supply.

If the rotation detection switch 23 is in the ON state, the power supply current is the charging current i ₃ of the capacitor 41.
begins to flow as Next, the rotation detection switch 23
When the capacitor 41 is turned off, the capacitor 41 is discharged, and during this period, the motor 22 rotates due to inertia, so the rotation detection switch 23 is turned on again, and as this is repeated, the terminal voltage of the capacitor 41 (connection point a) pulsates. , with this pulse voltage, the motor 22
continues to rotate, and the electrical tape 8 is transferred to the supply reel 9.
From then on, winding onto the take-up reel 10 begins.

When the magnetic tape 8 is completely wound onto the take-up reel 10, the rotation detection switch 23 stops rotating and the capacitor 41 is no longer charged or discharged, and the switching transistors 27 and 26 are sequentially rendered non-conductive, causing the motor to The rotation of 22 is stopped.

In this case, as the rotation speed of the supply reel 9 increases, the rotation detection switch 23 opens and closes more quickly.
In other words, the period of the pulse signal due to the charge/discharge cycle of the capacitor 41 becomes smaller, but since it is passed through the low pulse filter 44, the pulse signal is constrained as the period becomes smaller, and the connection point In b, it gradually converges. Therefore, the output in the integrating circuit 3, that is, the potential at the connection point C gradually increases, in other words, the base drive voltage of the transistor 27 decreases, and the rotational speed of the motor 22 is decelerated as it approaches the end of the tape. The running speed, that is, the rotational speed of the tape supply reel 10 is kept at a constant value. Therefore, stretching of the tape 8, etc. is effectively prevented.

In particular, when the start switch 24 is closed, the self-holding circuit 49 maintains the on state of the switch 24, that is, the state in which the rotation detection switch 23 is connected in series to the power supply 21, so that the tape 8 cannot be wound. will continue stably until its end.

Of course, even during tape winding, if the push button 13 for operating the stop switch is pressed, the rotation detection switch 2 is activated by closing the stop switch 48.
3 is shorted and no pulse voltage is generated,
Therefore, tape running can be temporarily stopped.

Note that in the above configuration, the degaussing switch 54 is
Only when the start switch 24 and the start switch 24 are pressed simultaneously, the thyristor 53 is turned on, the degaussing head 52 can be excited, and the tape 8 can be demagnetized.

By the way, in the above embodiment, the self-holding circuit 49
The self-holding circuit 49 is not limited to such a magnetic coupling means, but can be constructed using a light-emitting diode 56 and a photo-coupler as shown in FIG. An optical coupling means such as a photocoupler including a diode 57 may be used.

As described above, this invention provides a tape winding device that can accurately wind the tape regardless of the rattling of the magnetic tape cartridge by providing a self-holding circuit to maintain the closed state of the start switch. can be provided.

[Brief explanation of the drawing]

FIG. 1 is an external view showing an example of a tape winding device according to this invention, FIG. 2 is an electric circuit diagram of the same device, and FIG. 3 is an electric circuit diagram showing a modification of the main parts. 6... Tape supply reel shaft, 8... Tape, 2
1...DC power supply, 22...Motor, 23...Rotation detection switch, 24...Start switch, 26
...Switching transistor, 41...Capacitor, 49...Self-holding circuit.

Claims (1)

[Scope of utility model registration request] A rotation detection switch 23 is connected in series to the DC power supply 21 via a push-button start switch 24 and opens and closes in response to the rotation of the tape supply reel shaft 6 when winding the tape 8; Connected in series to the power source 21 via a capacitor 41 that is connected and repeatedly charged and discharged by the opening and closing operations to generate a pulse signal, and a switching transistor 26 that is controlled by the start switch 24 and the pulse signal from the capacitor 41. a motor 22 for driving the tape winding, and a self-holding circuit 4 connected in parallel to the start switch 24 to maintain the closed state of the switch 24.
9, and the voltage supply to the self-holding circuit 49 is controlled via the switching transistor 26.