JPH0138759Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tape drive device that can restrict vertical movement of a magnetic tape.

Conventionally, as this type of device, 1-a in FIG.
The item shown in 1-b was found. In FIG. 1, 1 is a capstan, 2 is a magnetic tape, 3 is a pinch roller, 4, 4' is an elastic body of the pinch roller 3, 5,
5' is a relatively hard core member, and 6 is the shaft of this pinch roller 3. In all of the above conventional examples,
The pressure distribution on the tape in the tape width direction has a slope, and as shown in Fig. 2, the pinch roller 3 is installed so that the pressure force is maximum at the center in the tape width direction, and is shown in 1-a. The one shown in FIG. 1 has a symmetrical inclination in the elastic body 4, and the one shown in 1-b has a symmetrical inclination in the core member 5'. In conventional analog tape recorders, the above-mentioned conventional example did not cause much inconvenience, but in digital tape recording such as fixed head PCM tape recorders that have recently been developed, narrow tracks can be recorded and played back. Therefore, extremely high tracking accuracy is required. Therefore, there has been a long-awaited development of a tape drive device that can accurately suppress fluctuations in tape running in the width direction of the tape.

This idea was devised based on the above-mentioned needs, and by giving an asymmetrical pressure distribution with respect to the tape center in the tape width direction, the tape running is directed to one side of the tape guide's vertical regulating section. It is an object of the present invention to provide a tape drive device that can control vertical movement of the tape by bringing the tape into contact with the tape.

The principle of this invention will be explained below with reference to FIGS. 3 and 4. For example, in order to obtain an asymmetrical pressure distribution on the magnetic tape 2 with respect to the center of the magnetic tape 2 as shown in 3-a, the surrounding elastic body is applied to the asymmetrical pinch roller 7 as shown in 3-b. Then, pressure is applied to the magnetic tape 2. Then, as is well known, the running magnetic tape 2 always tends to move to the point of maximum pressure, so in this case the magnetic tape 2 tends to move downward. At this time, as shown in FIG. 4, a tape guide 8 is provided to regulate the vertical position of the magnetic tape 2.
Since the vertical movement of the magnetic tape 2 is restricted at the position where one of the two contacts the magnetic tape 2, highly accurate tracking is possible.

Next, an embodiment of this invention will be described with reference to FIG. FIG. 5 is a diagram showing an embodiment of this invention, and 5-a and 5-b are diagrams showing a plane and a side view of the embodiment, respectively. Reference numeral 9 denotes a pinch roller 7 to enable vertical adjustment of the pinch roller 7.
A spring 10 is a nut for adjusting the pinch roller 7 in the vertical direction. 11 is a holder that holds the pinch roller 7; 12 is a spring that applies an elastic force to the holder 11 and applies an appropriate pressing force to the pinch roller 7; and 13 is a spring that is attached to the chassis 14 to finely adjust the pressing force. It is a plurality of holes provided. As mentioned above, the asymmetrical pressure distribution gives a moving force to the running magnetic tape 2 in the tape width direction, but if too large a moving force is applied, the magnetic tape 2 will be pushed against one of the vertical position regulating parts of the tape guide 8. Excessive contact may damage the tape edge or cause the magnetic tape 2 to turn over. Therefore, a plurality of adjustment holes 13 are provided in the chassis 14 so that the asymmetric pressing force can be finely adjusted mechanically so that the magnetic tape and the tape guide 8 come into contact with each other with an appropriate pressure. Further, a spring 9 and a nut 10 are used to adjust the vertical position of the pinch roller 7.
has been established.

In the above embodiment, the spring 9 and nut 10 for adjusting the vertical position of the pinch roller 7 are provided on the shaft of the pinch roller 7, and
A spring 12 for adjusting the pressing force on the magnetic tape 2 is provided on the support shaft of the holder 11, and as shown in FIG. 6, the vertical position of the pinch roller 7 is adjusted on the support shaft of the holder 11. A spring 9' and a nut 10' may be provided, and a spring 12' for adjusting the pressing force may be provided outside the support axis of the holder 11, and the same effect as in the above embodiment can be achieved.

Further, in the above embodiment, a pinch roller having an asymmetrical elastic body around it is used, but a desired pressure distribution can be obtained even if the core member is asymmetrical instead of the elastic body.

Furthermore, instead of making the elastic body and core member of the pinch roller asymmetric, the maximum point of the pressing force may be shifted from the center of the tape by adjusting the position of the pinch roller in the vertical direction, and the same effect as in the above embodiment can be obtained. play.

Next, in the case of a double capstan tape recorder or the like, the device of this invention may be provided on the pinch roller on the tape entry side.

As mentioned above, this invention provides a pressure distribution in the width direction of the magnetic tape 2 against the magnetic tape 2 in a tape drive device that drives the magnetic tape 2 by a capstan and a pinch roller pressed against the capstan. The pinch roller 7 is configured such that the pressing force is applied so as to be asymmetrical with respect to the center of the width direction of the magnetic tape 2, and the maximum pressing force point of the asymmetrical pressing force distribution is arbitrary with respect to the width direction of the magnetic tape 2. a maximum pressure point position adjustment device consisting of a spring 9, a nut 10, etc. to be able to adjust the position, and a spring 12, an adjustment hole 13, etc. to adjust the pressure force against the magnetic tape 2. The magnetic tape 2 is provided with a pressure adjusting device and a tape guide 8, and the vertical direction of the magnetic tape 2 is regulated by bringing the magnetic tape 2 into contact with one of the vertical direction regulating portions of the tape guide 8. Since running fluctuations of the magnetic tape 2 in the tape width direction can be suppressed with high accuracy, very high tracking accuracy can be obtained.

[Brief explanation of drawings]

Figure 1 is a structural diagram showing a conventional tape drive device.
FIG. 2 is an explanatory diagram for explaining the pressure force distribution on the tape in this conventional tape drive device,
3 and 4 are explanatory diagrams for explaining the principle of this invention, and FIG. 5 is a plan view 5-a, a side view 5-b, and a The figures are a plan view 6-a and a side view 6-b of a tape drive device showing another embodiment. 2...magnetic tape, 7...pinch roller, 8...
... Tape guide, 9, 12 ... Spring, 10
... Nut, 13 ... Adjustment hole.

Claims (1)

[Scope of utility model registration request] In a tape drive device that drives a magnetic tape using a capstan and a pinch roller that is pressed against the capstan, the pressure distribution in the width direction of the magnetic tape is such that the distribution of pressure in the width direction of the magnetic tape is relative to the center in the width direction of the magnetic tape. a pinch roller that applies pressure asymmetrically to the magnetic tape; and a maximum pressure point position adjustment device that allows the maximum pressure point of the asymmetric pressure distribution to be arbitrarily adjusted in the width direction of the magnetic tape. , a pressure-bonding force adjustment device for adjusting the pressure-bonding force with respect to the magnetic tape, and a tape guide are provided, and the magnetic tape is brought into contact with one of the vertical direction regulating portions of the tape guide. A tape drive device characterized by regulating the vertical direction of a magnetic tape.