JPH03125360A - Tape winding mechanism - Google Patents

Abstract

PURPOSE:To prevent a random winding of tape by moving a reel base in the axial direction so that inclination and displacement are not caused on a tape between two sensors in accordance with the displacement of a tape when the positional fluctuation in the width direction of the tape is detected at the winding time. CONSTITUTION:It is detected as to whether a tape 56 comes in while descending to a reel 55 or comes in while ascending is detected from the outputs of sensors 60, 61 and a reel base device 65 is controlled so that the tape 56 is wound in parallel to the reel 55 in the case of its being in descending or ascending tendency. Namely, in the case of its coming in while descending, the reel 55 is lifted by the quantity corresponding to the inclination thereof with the electrification to the driving coil 35 of a voice coil motor 68, also in the case of its coming in while ascending to the reel 55, the reel 55 is descended by the quantity corresponding to the inclination by the voice coil motor 68 and the tape 56 is made to be wound in parallel at all times and also by passing through a reference traveling position.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tape winding mechanism for an apparatus that performs magnetic recording and reproduction using a tape-shaped magnetic recording medium. More specifically, the present invention relates to a tape winding mechanism that moves a reel stand in the tape width direction to regulate the tape running position.

(Prior Art) Currently, in magnetic recording and reproducing devices using magnetic tape such as video tape recorders (VTRs) and digital audio tape recorders (DATs), the volumetric recording density of video data, audio data, and other data is limited. Improvement is required. Taking tape cassette type devices as an example, technology is progressing in the direction of increasing areal recording density and volumetric recording density in order to record a large amount of information in a cassette with established standards. For the former, concrete measures such as narrowing the track can be considered, and for the latter, measures such as making the tape thinner can be considered.

However, when the track is narrowed, if the tape moves in the tape width direction, fluctuations in the playback output will occur, causing problems. If there are variations in the dimensions of the tape (including the reel) or if the height of the reel stand varies depending on the device, the tape will not run at the reference position, and recording and playback will not be performed accurately with such unstable running. When tapes are made thinner, conventional tape guiding methods that suppress variations in the width direction of the tape by mechanically contacting the tape edges may damage or deform the tape edges. To solve these problems, it is effective not to mechanically restrict the tape edges, but to move the entire tape in the width direction, run it to a fixed position, and wind the tape around the cassette without disturbance.

Conventionally, as shown in FIG. 5, a device for preventing uneven winding of a tape is applied by applying vibration to a reel stand 102 in a cassette 101 using an excitation device using a cam mechanism 103, and moving the tape 105 to be wound onto a reel 104. There is a device in which the winding is deflected to one side (Japanese Patent Application Laid-open No.
2-298817).

(Problem to be Solved by the Invention) However, this device is used in a magnetic tape manufacturing factory etc. when winding a magnetic tape in portions from an original roll onto a cassette reel.
Since the reel 2 is moved up and down, it not only produces noise (vibration noise) but also requires a very large reel stand device, including the structure for vertical movement, and it is difficult to incorporate it into the reel stand of a VTR or DAT. This is difficult in practice. Furthermore, by applying a constant vibration to the reel stand 1 (12) regardless of the actual amount of tape fluctuation, the tape 105 is simply brought to one side of the reel 104, so although it is possible to prevent random winding with certainty. Moreover, it is not possible to run the tape at a fixed position, that is, the reference running position. Therefore, due to variations in the tape cassette, tape width, etc., the running position in the tape width direction changes, and the reel stand device and the tape running reference position vary. If the position of the tape varies from tape deck to tape deck, the above-mentioned position regulation by applying constant vibration is not sufficient.

The present invention enables tape-like recording! To provide a tape winding device II that allows tK# to travel at a fixed position when winding it onto a reel and prevents random winding.

<Means for Solving the Problems> In order to achieve the above object, the present invention includes a sensor that detects the position in the width direction of the tape, and an output from the sensor that winds the tape while moving the reel stand in the width direction of the tape. A tape winding mechanism comprising a reel stand device for taking the tape,
Two sensors are provided in the tape running direction, and the tape is wound up while moving the reel stand up and down so that the tape is perpendicular to the rotational axis direction of the reel stand based on the outputs of these two sensors. There is.

(Function) Therefore, when a positional change in the width direction of the tape is detected during tape winding, the reel stand is moved in the axial direction according to the amount of displacement so that the tape does not tilt between the two sensors. , the tape is given a required displacement in the width direction in a direction perpendicular to the direction of the rotation axis of the reel stand, and is wound up while running at a fixed position.

(Example) Hereinafter, the configuration of the present invention will be described in detail based on an example shown in the drawings.

FIGS. 1A and 1B show an embodiment of the tape winding mechanism of the present invention. This tape winding mechanism includes two sensors that detect the widthwise position of the tape 56 in the vicinity of the cassette 51. 60.61 and these two sensors 60.6
The tape 56 is composed of a reel stand device 65 that winds up the tape 56 while giving it movement in the width direction based on an output difference of 1.

The sensors 60 and 61 are installed between the flangeless post 57 and the reel 55, which are installed near the cassette 51. The sensors 60 and 61 are sensors that can detect the position of the tape edge, and in this embodiment, a light emitting diode (LED) is used as the light source 62, and a light receiving element 6 is used.
A photodiode is used as the photodiode 3, which is placed opposite to each other with a tape 56 in between. The positions of the sensors 60 and 61 are adjusted so that the same output is obtained at the tape running reference position, and the relationship between the tape displacement and the output is also adjusted so that both outputs are the same when the tape 56 runs at the reference position. It has been adjusted. Although the sensors 60 and 61 are not shown, for example, a transmission type optical sensor is attached to something like a sensor post between the flangeless post 57 installed near the reel stand 9 and the reel stand 9, It is fixed on the frame (chassis) 14 and 2 in the tape running direction.
A set is provided.

When there is only one sensor, as shown in FIG. 2, even if the reel stand 9 is lowered in an attempt to correct the tape displacement based on the sensor output, the tape 56 will only become slanted.
There is a possibility that a problem may arise in that the tape position is wound without being corrected. Therefore, at least two or more sensors 60 and 61 are arranged at a certain distance in the tape running direction.

Although the sensors 60 and 61 are not particularly limited, it is also possible to use a reflective sensor in which a light emitting part and a light receiving element are combined into one. In this case, a sensor and a post are required to sandwich the tape and face each other in order to obtain reflected light. A light emitting diode (LED) is generally used as the light emitting part 62 of this sensor 60.degree. 61, but a light bulb, laser, etc. can also be used. Further, although a phototransistor is generally used as the light receiving element 63, a photodiode, a solar cell, etc. can also be used. Also, flangeless post 5
Either the phototransistor 63 or the light emitting diode 62 may be embedded in the phototransistor 7 itself, and the other may be placed on the outside of the tape so as to face each other.

The post 57 installed near the reel stand 9 may be a post that is not provided with a flange or the like that mechanically restricts the edge of the tape 56, at least in an area where the tape 56 may fluctuate in the width direction, such as a tape post. 56 from the cassette 51 is employed, preferably a rotating post whose surface in contact with the tape rotates. In the figure, reference numeral 52 indicates a cassette holder that is positioned on the cassette reference surface when the cassette is set in the tape transport device, 53 indicates a leaf spring provided within the cassette, and 54 indicates a tape guide provided within the cassette. Post and 55 are reels.

The reel stand device 65 can be implemented as long as it can wind the tape while moving the reel stand in the width direction of the tape based on the sensor output, and is not particularly limited. Preferably, a voice coil motor is used as the axial movement means for moving the device in the direction.

For example, as shown in FIG.
A rotary drive motor 67 that rotates the reel stand 9, an axial movement means 68 that displaces the reel stand 9 in the axial direction, and a reel original position sensor 69 that detects the position of the reel stand 9, and rotates integrally in the rotation direction. The reel shaft 7, which is the center of rotation of the reel stand 9, and the rotary drive motor 67 are connected to each other by a rotation transmission member 66 that can freely move relative to each other in the axial direction, and the reel shaft 7 is connected to the movable part of the axial movement means 68. ,
The rotating reel shaft 7 and reel stand 9 are configured to be displaced in the tape width direction by an axial moving means 68.

The rotary drive motor 67 has a rotor magnet 13 supported by magnet receivers 11 and 12 and a printed circuit board 1.
The rotor side, which consists of a magnet 13 and a magnet receiver 11.12, is mounted on a plate 14.17, which is a part of the chassis of the VTR, through a bearing 32 and rotates around the reel axis. freely supported. This rotor-side magnet 13 is attracted by the plate 1-17111 and applies a certain preload to the bearing 32.

The reel shaft 7 and the reel stand 9 are fixed with a screw 42 and are provided so as to move integrally. The reel shaft 7 is supported by the yoke 31 of the voice coil motor so as to be linearly movable and rotatable, with the linear slider 34 as a bearing. A reel hub 5 is fitted into the reel stand 9 with a spring 8 interposed therebetween so as to be freely movable in the axial direction, and is prevented from coming off by a cap 6. -The Ir cap is fixed to the reel shaft 7 by a screw 42a. Therefore, the reel hub 5 is movable in the reel axis direction.

The reel stand 9 is connected to the magnet receiver 12 via a rotation transmission member 66.The rotation transmission member 66 is made by connecting two leaf springs 1 and 4 with a collar 2.3 and a screw 41. The leaf spring 4f is attached to the bottom of the blade base 9 on the 1st side.
ll! I is fixed to the magnet receiver 12 side, respectively, and is provided so that the rotational force of the motor 67 can be transmitted to the reel stand 9. The shapes of these two leaf springs 1 and 4 are not particularly limited and can be selected as appropriate. The springs 1 and 4 have a rectangular shape, and the leaf springs 1 and 4 are connected to each other on one diagonal line.
On the other diagonal, the leaf spring 4 is fixed to the magnet receiver 12, and the leaf spring 1 is fixed to the reel stand 9, respectively. therefore,
The rotational force of the rotary drive motor 67 is generated as follows: magnet receiver 12 (rotor) → leaf spring 4 → connecting means 2, 3, 41 → leaf spring 1 →
The signal is transmitted to the reel table 9.

The axial movement means/voice coil motor 68 includes one bobbin to which the drive coil 35 is attached, a magnet 30, a yoke 31 that supports this, and a reel shaft 7 relative to the yoke 31.
It is composed of a linear slider 34 that supports the reel shaft 7 so as to be movable in the axial direction, a rotation prevention bin 20 that prevents the rotation of the bobbin 19, a sliding bearing 21, and a bearing 33 that allows the bobbin 19 to rotatably support the reel shaft 7. There is. The magnet 30 of this voice coil motor is radially magnetized, and the bobbin 19 is moved in the axial direction of the reel shaft 7 by energizing the drive coil 35 wound in the circumferential direction. That is, the reel shaft 7 rotatably attached to the bobbin 19 via the bearing 33 is moved in the axial direction. The movable part of the axial movement means constituted by the bobbin 19 around which the drive coil 35 is wound is fixed to the yoke 31 in the rotational direction by the rotation prevention pin 20, but can be moved in the axial direction. It is provided. Further, in this embodiment, a speed detection coil 36 is attached to the bobbin 19, and its output is used to perform speed servo control to improve accuracy. Reference numeral 18 is a bush for fixing the bearing 33 to the reel shaft 7, 37 is a damper O-ring for absorbing shock when the reel stand 9 moves upward, and 16 is a printed circuit board.

A reel original position sensor 69 is provided between the yoke 31t of the voice coil motor and the bobbin 19 to detect the reel original position, that is, the axial reference original position of the bobbin 19 interlocked with the reel stand 9. The reel original position sensor 69 includes a Hall element 26 attached to the yoke 31 and a magnet 27 attached to the bobbin 19 side.

The Hall element 26 is housed in a Hall element holder 29 fixed to the yoke 31, and the magnet 27 is housed in the yoke 28 to the magnet holder 22 fixed to the bobbin 19 with a screw 39.
is held through. This reel original position sensor 69
detects the reference position on the reel stand 9 of the tape 56 sent out from the reel stand 9 or the tape 56 wound on the reel stand 9. The voice coil motor 68 only applies axial displacement to the reel stand 9 via the reel shaft 7, and cannot determine the position of the voice coil motor 68 itself.

Therefore, the reference position is confirmed by this reel original position sensor 69, and the group movement and movement direction are determined by the output of the sensor 61.6 In addition, the yoke 31 is provided with a counterbalance device that urges the lower end of the reel shaft 7 upward. A spring 43 is provided. In current general household VTRs, the cassette is on the reel stand9.
It is configured to be placed on top of. The cassette 51 has a built-in leaf spring 53 that presses the reel 56. Therefore, the weight of the cassette 51 and the load of the spring 53 are applied to the reel stand 9 and the reel shaft 7. Therefore,
A counterbalance spring 43 is provided to reduce these loads and lighten the burden on the axial moving means.

According to this control block, an example of which is shown in FIG. 4, two tape position sensors 60, 61 are used during rewinding.
The outputs of the tape 56 are input to the differential amplifier 70, and the inclination and displacement of the tape 56 between the sensors 60 and 61 are determined from the output difference or ratio, and the voice coil motor 65 is driven so that the inclination and displacement become zero. The sensor signal output from the differential amplifier 70 passes through a compensation circuit 71 and a driver 73, and is converted into a voltage sufficient to drive the voice coil motor 68 and is input to the drive coil 35 of the voice coil motor 68. The output of the tape 60.61 position sensor and the output of the reel original position sensor 69 are connected to the analog switch 72.7.
6 is selectively introduced into the driver 73 to drive the voice coil motor 68. Note that 74 is an amplifier and 75 is a compensation circuit. At the start of operation, the input of the sensor switching signal passes the output from the reel original position sensor 69 to the voice coil motor 6.
8 to a predetermined original position. In the operating state, the outputs from the tape position sensors 60 and 61 are input, and the voice coil motor 68 is moved up and down based on the output difference.

The tape winding mechanism constructed as described above operates as follows.

For example, the cassette 51 is loaded with a loading mechanism (not shown).
The cassette is inserted into the cassette receiver 52 and set in a fixed position. At this time, an external force F is applied to the cassette tape 51 so that no gap is generated between the cassette reference surface and the cassette receiver 52. Further, although not shown, a pack tension post and a tape loading post are set at predetermined positions within the cassette 51 in order to pull out the tape 56. Then, when a sensor (not shown) or the like detects that the cassette is set in the normal position, the reel stand 9 is set at the reference position to start the operation. Using the reel home position detection sensor 69, an offset voltage for setting a reference position is applied to the coil 35 of the voice coil motor 68 to move the reel stand 9 to the home position. or mechanically set in place. When the movable part (bobbin 19) of the voice coil motor 68 does not move to the original position, the reel 5
5 is set at a standard position with respect to the cassette reference plane. When the loading of the cassette is completed through the above operations, the tape loading mechanism is activated to sequentially move the tape loading post and the pack tension post. Once they reach and are positioned, the tape loading operation is complete.

Thereafter, operations such as recording and reproduction are performed as necessary by mode operation, and the tape 56 runs.

When the tape 56 is wound onto the reel 55 during rewinding, etc., fluctuations in the width direction of the tape 56 may occur, but this is detected by the sensor 6061, and the detected current is controlled as shown in FIG. The voice coil motor 68 of the reel stand device 65 is controlled by the input to the circuit, and the reel stand 9 is moved so that the inclination and displacement of the tape between the sensors 60 and 61 is zero, and the reel axis 7 of the reel stand 9 is always maintained. The tape 56 is wound in a direction perpendicular to the direction.

For example, it is detected from the outputs of the sensors 60 and 61 whether the tape 56 is entering the reel 55 while descending, rising, or parallel to the reel 55, indicating that the tape 56 is in a downward or upward trend. tape 5 in case
The reel stand device 65 is controlled so that the tape 6 is wound parallel to the reel 55. That is, when the tape 56 comes in while descending, the drive coil 35 of the voice coil motor 68 is energized to lift the reel 55 by an amount corresponding to the inclination, and the tape 56 comes in while rising relative to the reel 55. In this case, the voice coil motor 68 lowers the reel 55 by an amount corresponding to the inclination of the tape 56.
When the machine is traveling, it always passes through the reference traveling position and is wound up. This can prevent uneven winding. If tape 56 is always wound parallel, tape 5
No irregular winding of tape 56 occurs, and even when the tape is supplied, the tape 56
The problem of the paper being sent out while fluctuating in the width direction is also eliminated.

Although the above-mentioned embodiment is an example of a preferred implementation of the present invention, it is not limited thereto, and various modifications can be made without departing from the gist of the present invention.For example, in this embodiment, the shaft Although a voice coil motor is used as the direction moving means 68, a DC motor, stepping motor, piezoelectric actuator, etc. can also be used depending on accuracy and performance. Additionally, cams, gears, etc. can also be used as a driving method for the axial movement means.

(Effects of the Invention) As is clear from the above description, when a positional change in the width direction of the tape is detected during tape winding, the tape is tilted and tilted between two sensors according to the amount of displacement. The reel table is moved in the axial direction to prevent displacement, and the required displacement in the width direction is given to the tape in a direction perpendicular to the rotational axis direction of the reel table, and the tape is wound up while traveling at a fixed position. Therefore, it is possible to prevent the tape from being rolled up incorrectly.

Moreover, if irregular winding does not occur when the tape is wound onto the supply reel, when the tape is supplied from the supply reel during recording and playback, the tape runs stably and there is no tracking disturbance.

Further, since the tape can be run at a fixed position without providing a flange to restrict the tape edge, the tape edge will not be damaged even if a thin tape is used.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the tape winding mechanism of the present invention, in which (A) is a front view and (B) is a plan view. Figure 2 is a diagram showing fluctuations in the tape running state when using one sensor to control the movement of the reel stand in the tape width direction, (A)
(B) is a state where the tape is running at the standard running position, (B) is a state where the running position is shifted by l from the standard running position, (C) is a state where the tape is running at the standard running position.
3 shows a state in which the deviation is further enlarged to 11 due to the movement of the reel stand even though the tape is running at the reference running position at the sensor position. FIG. 3 shows an example of the reel stand device. FIG. 4 is a block diagram showing an example of a control system, and FIG. 5 is a principle diagram showing a conventional reel stand control device. 56...Tape, 60.61...Sensor, 65...
・Reel stand device.

Claims (1)

[Claims] A tape winding mechanism comprising a sensor that detects the position of the tape in the width direction, and a reel stand device that winds the tape while moving the reel stand in the tape width direction based on the output of the sensor, A tape winding device comprising: two sensor outputs in one direction, and the tape is wound up while moving the reel stand up and down so that the tape is perpendicular to the direction of the rotation axis of the reel stand based on the outputs of the two sensors. mechanism.