JPS60136936A - Tape carrying device - Google Patents

Abstract

PURPOSE:To decrease the resonance vibration generated with a tape tension sensor and spring characteristic of a tape by arranging the tension sensor between reels so as to cancel the unbalance of a tape tension fluctuation value at both terminals of the tape tension sensor. CONSTITUTION:The condition zeroing a force exciting a tension sensor 4 is f1= -f2 and since the tension fluctuation values f1, f2 are reverse in the acting direction, the condition of amplitude has only to be satisfied. That is, when a speed sensor 6 is provided, since the tape tension fluctuation value f1 is small through the effect of the inertial load of the speed sensor 6, the tape tension fluctuation values f1, f2 are balanced in setting the interval between the tension sensor 4 and the reel 2 shorter that much. Thus, the resonance vibration generated between the tension sensor 4 and the tape 3 is prevented and the tape is moved with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a device for transferring tape from reel to reel, and particularly to a tape transfer device suitable for transferring tape with high precision.

[Background of the invention]

2. Description of the Related Art Conventionally, as one type of magnetic storage device, there is one in which a supply reel and a take-up reel are driven by separate motors, and the magnetic tape wound on these reels is transferred to a head section. An example of this device is JP-A-53-14
It is described in Publication No. 4307.

The reel-to-reel tape transport device in this type of magnetic storage device does not have a vacuum column to control tape tension, so it applies a tension control torque to the motor that is proportional to the radius of the tape wound on the reel. Equipped with tension control means. This tension control means includes a tension sensor that contacts the tape between the reels and detects the tension.

In such a tape transfer device equipped with a tension sensor, when the tape is started at high acceleration to a predetermined speed, the tension sensor in contact with the tape resonates due to the tape's springiness, causing tape vibration. occurs. For this reason,
High-speed tape start and stop operations were not possible.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a tape transfer device that can reduce resonance vibrations generated due to the tape tension sensor and the elasticity of the tape, in order to enable high-precision tape transfer.

[Summary of the invention]

As a result of analysis, the inventor of the present application found that in a reel-to-reel tape transfer device, the resonance vibration that occurs between the tape tension sensor and the tape when the tape is started at high speed is Focusing on the fact that this occurs secondary to the vibration of the tape tension sensor due to the unbalance of the tension fluctuation value,
The tension sensor is arranged between the reels so as to eliminate the imbalance in tape tension fluctuation values at both ends of the tape tension sensor.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

, FIG. 1 shows an embodiment of the tape transport device of the present invention.

In this figure, a tape transport device runs a magnetic tape at a predetermined speed, records information on the tape, and reproduces information from the tape. 1 is magnetic tape, 2
, 3 are reels on which the magnetic tape 1 is wound.
The wheels 2 and 3 are each driven by a motor (not shown). By driving the motor, the magnetic tape 1 is transferred from one reel 2 to the other reel 3 via a tension sensor 4, a magnetic head 5, and a speed sensor 6.

The tension sensor 4 detects the tape tension required to apply tape tension control torque to the motor, and an example of its configuration is shown in FIG. 2. In this figure, parts with the same reference numerals as those in FIG. 1 are the same.

The magnetic tape 3 is hung on a roller rough. The roller 7 is rotatably supported by a roller support 8. The roller support 8 is fixed to a fixed block 10 via a plate spring 9. This fixed block 10 is attached to the device casing 11
The position is adjustable. A sensor section 12 is arranged below the roller support 8 to detect the tension of the roller 7 from its displacement.

f and f2 in FIG. 1 indicate tape tension fluctuation values that occur when the tape 3 is transferred.

Here, the tape tension fluctuation values f1 and fI2 become sources of resonance vibration generated between the tape tension sensor 5 and the tape 3. In FIG. 1, if the mounting angle of the tension sensor 4 is θ with respect to the tape running direction, then the tension sensor 4
The force f that excites the tension sensor is expressed by the following formula (1) where, f : the force that excites the tension sensor f, , f, 2
: Tape tension fluctuation value θ : Tension sensor mounting angle Therefore, the condition for making the force that excites the tension sensor 4 zero is the following equation (2).

f, = -f, (2) The tape tension fluctuation value f,, fQ satisfies the above equation (2) because the direction of action is opposite as shown in Figure 1. only needs to satisfy the size condition. As a result, resonance vibration of the tension sensor 5 that occurs secondarily can be prevented. In Figure 1, the formula (
The conditions for the tape transfer device that satisfy 2) are such that if the speed sensor 6 is not used, the tension sensor 4 is connected to both reels 2 and 2.
, 3.

When the speed sensor 6 is provided, the tape tension fluctuation value f becomes smaller due to the influence of the inertial load of the speed sensor 6. Therefore, if the distance between the tension sensor 4 and the reel 2 is set to be shorter, the tape tension fluctuation value f1. f is balanced.

According to this embodiment, it is possible to prevent resonance vibrations occurring between the tension sensor 4 and the tape 3, so that the tape can be transferred with high precision.

FIG. 3 shows another embodiment of the apparatus of the present invention, in which the same reference numerals as in FIG. 1 are the same parts. In this embodiment, in order to compensate for changes in the approach angle θ of the tape 1 to the roller 7 of the tension sensor 4 due to an increase or decrease in the amount of tape wound on the reel 3, there is a gap between the tension sensor 4 and the reel 3. A tape guide roller 12 is installed.

With this configuration, the approach angle θ of the tape 1 with respect to the roller 7 of the tension sensor 4 is always constant, and the condition for vibration reduction given by the above-mentioned equation (2) can be satisfied. . As a result, resonance vibration occurring between the tension sensor 4 and the tape l can be prevented.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reduce the vibration of the tape transfer device without adding an expensive damper mechanism, and it is also possible to transfer the tape with high precision.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of the tape transfer device of the present invention, FIG. 2 is a perspective view showing an example of a tension sensor used in the tape transfer device of the present invention shown in FIG. 1, and FIG. The figure is an overall configuration diagram showing another embodiment of the tape transport device of the present invention. 1... Magnetic tape, 2, 3... Reel, 4... Tension sensor, 5... Magnetic head, 6... Speed sensor,
7...Roller, 12...Tape guide roller. (Fang 1 Figure 2 Male 3 Figure Procedural Amendment Small Handwritten) Showa Ta δ Year Patent Application No. 2'f3?83 No. 2, Name of Invention Tape Transfer Device 3, Relationship with Case of Person Making Amendment Patent Application Name of Person Name (5101 Co., Ltd. 1) Seisakusho 4
, Agent 5, Subject of amendment: The following matters in the Detailed Description of the Invention column of the Specification and Drawing 6, Contents of the Amendment, Appendix ①, the Detailed Description of the Invention column of the Specification. (1) Add the following sentence between page 6, line 14 and line 15 of the same page of the specification. In the embodiment shown in FIG. 1, the case where the mounting angles θ and θ of the tension sensor 4 with respect to the tape 3 are equal, respectively.
2 may be different. In this case, tension sensor 4
The force f that excites the is expressed by the following equation (3). f = cosθg −f(+cosθ2−fw −(3
) Therefore, the conditions for making the force f vibrating the tension sensor 4 zero are as follows from the above equation (3). In this way, if the installation of the tension sensor 4 is changed so that the installation angles θ1 and θ2 of the tension sensor 4 are set to optimal values, the tension generated secondary to the tape tension fluctuation values ft and f2 can be reduced. Resonant vibration of the sensor 4 can be prevented. (2) The following sentence is added between page 7, line 7 and line 8 of the same page of the specification. ``In addition, also in the embodiment shown in FIG. 3, the above-mentioned formula (
The attachment of the tension sensor 4 may be changed so that the force f that excites the tension sensor 4 in 3) is made zero. ” ■Regarding drawing 0, Figures 1 and 3 are corrected as shown in the attached sheet. More than 10

Claims (1)

[Claims] 1. In order to transfer the tape from one reel to the other reel, it comprises means for driving the reels, means for adjusting the tape tension between the reels, and means for detecting the tape speed. 1. A tape moving device, wherein the inter-reel tape tension adjusting means is arranged so that fluctuations in tape tension acting from both directions of the tape applied thereto cancel each other out. 2. The tape transport device according to claim 1, wherein the tape tension adjusting means is attached to the device casing via a position adjusting means. 3. The tape transport device according to claim 2, further comprising a tape guide roller provided between the tape tension adjusting means and a reel located close to the tape tension adjusting means.