JP2008165853A - Pinch roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that the conventional pinch roller built in a magnetic recording and reproducing device requires a time to stabilize the tape running. <P>SOLUTION: The height center of the pinch roller bearing 5 in the pinch roller shaft 3 direction shifts from the height center of the cylindrical holder 20 in the pinch roller shaft 3 direction. The inner surface facing the pinch roller shaft 3 in the center hole of the pinch roller bearing 5 is tapered to reduce the diameter in the shift direction of the pinch roller bearing 5. Thus, the time to stabilize the tape running can be reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pinch roller used in a magnetic recording / reproducing apparatus that records and reproduces signals by winding a magnetic tape around a rotary head cylinder at a predetermined angle.

  In recent years, magnetic recording / reproducing apparatuses used for video tape recorders and the like have been reduced in size and price.

  A conventional magnetic recording / reproducing apparatus will be described below with reference to FIGS. FIG. 2 is a plan view of the magnetic recording / reproducing apparatus in a recording / reproducing state. In FIG. 2, 13 is a main chassis. Reference numeral 14 denotes a rotary head cylinder having a magnetic head around it, and is rotatably supported with respect to the main chassis 13. Further, the rotary head cylinder 14 is disposed at a predetermined angle with respect to the main chassis 13 in order to record large-capacity information on the magnetic tape.

  Reference numeral 6 denotes a capstan, which is provided on the main chassis 13. The capstan 6 includes a capstan shaft 7. The capstan shaft 7 is rotated by driving a rotor (not shown) that is a drive source.

  Reference numeral 15 denotes a T boat, which includes a T roller post 15a and a T1 post 15b. When the T-boat 15 moves in the outer circumferential direction of the rotary head cylinder 14, the T roller post 15a and the T1 post 15b pull out the tape 1 from a cassette (not shown) and wind the tape 1 around the rotary head cylinder and the capstan shaft. . The tape 1 is recorded and reproduced by a magnetic head provided in the rotary head cylinder 14.

  Reference numeral 18 denotes a T3 arm, which is provided so as to be movable with respect to the main chassis 13. A T3 post 18a is provided on the T3 arm 18. The tape 1 is bridged between the T roller post 15a and the T3 post 18a, and the T3 arm 18 and the T boat 15 are moved, whereby the tape 1 is drawn from the tape cassette and wound around the capstan shaft 7.

Reference numeral 19 denotes a pinch roller that sandwiches the tape 1 with the capstan shaft 7 and rotates the capstan shaft 7 to drive the tape 1.
In the figure, the pinch roller 19 is pressed against the capstan shaft 7 and holds the tape 1 (recording / reproducing state). On the other hand, in FIG. 3, the pinch roller 19 is separated from the capstan shaft 7 and does not clamp the tape 1 (recording / reproduction stopped state).

  FIG. 4 is a cross-sectional view of a main part of a pinch roller of a conventional magnetic recording / reproducing apparatus. In FIG. 4, 19 is a pinch roller. Reference numeral 6 denotes a capstan, which includes a capstan shaft 7. Reference numeral 2 denotes a pinch arm, which is pivotally supported by the main chassis 13. Reference numeral 3 denotes a pinch roller shaft provided on the pinch arm 2. The pinch roller 19 and the pinch roller shaft 3 are screwed and fixed with a screw (not shown).

  4 is a cylindrical elastic body, 20 is a cylindrical holder, and 12 is a pinch roller bearing. The pinch roller 19 includes a cylindrical elastic body 4, a cylindrical holder 20, and a pinch roller bearing 12. The outer peripheral surface of the pinch roller bearing 12 is fixed to the inner peripheral surface of the cylindrical holder 20. The inner peripheral surface of the cylindrical elastic body 4 is fixed to the outer peripheral surface of the cylindrical holder 20. The inner peripheral surface of the hole of the pinch roller bearing 12 has a cylindrical shape parallel to the pinch roller shaft 3. The pinch roller bearing 12 is loosely inserted into the pinch roller shaft 3 and is provided to be rotatable with respect to the pinch roller shaft 3.

  8 is a center line of the height of the cylindrical holder 20 in the direction of the pinch roller shaft 3, and 9 is a center line of the height of the pinch roller bearing 12 in the direction of the pinch roller shaft 3. As shown in the figure, the center line 8 and the center line 9 are configured to coincide with each other.

With such a configuration, the tape 1 travels at a constant speed according to the rotational speed of the capstan shaft 7, and information signals are recorded and reproduced by the rotating magnetic head provided in the rotating head cylinder 14.
JP-A-8-102362

  In order to wind the tape 1 wound in parallel in the tape cassette along the inclination of the rotary head cylinder 14, it is necessary to twist the tape at each post through which the tape 1 passes. Conventionally, in order to correct the twist of the tape 1, for example, a post is inserted between the T roller post 15a and the capstan shaft 7 or between the T3 post 18a and the capstan shaft 7 to correct the tape twist. It was.

  However, there is an increasing demand for downsizing of equipment and low cost of materials, and it is necessary to reduce the number of posts as shown in FIGS. 2 and 3, and between the T-roller post 15 a and T3 post 18 a and the capstan shaft 7. Therefore, it is necessary to have a configuration in which the twisting of the tape generated in the above cannot be corrected sufficiently.

  As a result, the twist of the tape between the T roller post 15a and the capstan shaft 7 and / or between the T3 post 18a and the capstan shaft 7 is affected, and in the conventional configuration, the pinch roller as shown in FIG. Between the state of the apparatus from the state where the tape is separated from the capstan shaft (recording / reproducing stop state) to the state where the tape 1 sandwiched between the pinch roller and the capstan shaft (recording / reproducing state) is driven as shown in FIG. When the transition is made, there is a problem in that the vertical position of the tape with respect to the capstan shaft 7 is stabilized and it takes a long time for the tape to travel stably.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to shorten the stable running transition time from the recording / reproducing stop state to the recording / reproducing state.

  In order to achieve this object, a pinch roller according to the present invention has a cylindrical holder that supports a cylindrical elastic body, and a central hole that is fixed to the inner peripheral surface of the cylindrical holder and is rotatable about a central axis. And a center of height of the bearing portion in the central axis direction is deviated from a center of height of the cylindrical holder in the central axis direction, and the central axis in the central hole The inner peripheral surface that faces is provided with a taper shape that decreases in diameter in the direction of deflection of the bearing portion.

  The present invention can provide a pinch roller that can shorten the stable running transition time from the recording / reproducing stop state to the recording / reproducing state.

The pinch roller of the present invention includes a cylindrical holder that supports a cylindrical elastic body,
A bearing portion that is fixed to the inner peripheral surface of the cylindrical holder and has a center hole that is rotatable around a central axis, and the center of height of the bearing portion in the central axis direction is in the central axis direction. The cylindrical holder is biased with respect to the height center, and an inner peripheral surface facing the central axis in the central hole has a tapered shape whose diameter decreases in the biasing direction of the bearing portion. The inner peripheral surface of the pinch roller bearing is tapered with respect to the shaft peripheral surface that is loosely inserted into the pinch roller bearing. When the roller rotates, the taper-shaped bearing portion acts in a direction to correct the twist of the tape, so that the tape sandwiched between the pinch roller and the capstan shaft quickly and stably runs.

  A video camera will be described below as an example of the best mode of the present invention with reference to FIGS.

  FIG. 1 is a cross-sectional view of the main part of the present embodiment. In FIG. 1, 19 is a pinch roller. Reference numeral 6 denotes a capstan, which includes a capstan shaft 7 (rotating shaft). Reference numeral 2 denotes a pinch arm, which is pivotally supported by the main chassis 13 (see FIG. 2). Reference numeral 3 denotes a pinch roller shaft (center shaft) provided on the pinch arm 2.

  4 is a cylindrical elastic body, 20 is a cylindrical holder, and 5 is a pinch roller bearing. The pinch roller 19 includes a cylindrical elastic body 4, a cylindrical holder 20, and a pinch roller bearing 5. The outer peripheral surface of the pinch roller bearing 5 is fixed to the inner peripheral surface of the cylindrical holder 20. The inner peripheral surface of the cylindrical elastic body 4 is fixed to the outer peripheral surface of the cylindrical holder 20. The pinch roller bearing 5 is rotatably provided with respect to the pinch roller shaft 3 by loosely inserting the pinch roller shaft 3. For example, rubber or the like can be used as the cylindrical elastic body 4, and the pinch roller 19 is elastically deformed by pressing the capstan shaft 7. Tape 1 is driven by sandwiching tape 1 between cylindrical elastic body 4 and capstan shaft 7 and rotating capstan shaft 7.

  In the present embodiment, the height center of the pinch roller bearing 5 in the direction of the pinch roller shaft 3 is deviated (the amount of deviation is 10) from the height center of the cylindrical holder 20 in the direction of the pinch roller shaft 3. The inner peripheral surface of the center hole facing the pinch roller shaft 3 is configured to have a tapered shape with a diameter that decreases in the biasing direction of the pinch roller bearing 5.

  In the conventional configuration, since the pinch roller 19 is pressed in a direction orthogonal to the capstan shaft 7, it is difficult to correct the twist of the tape 1, and it takes about 0.5 to 1.0 sec for stable running. As a result, the tape 1 sandwiched between the capstan shaft 7 and the pinch roller 19 has a configuration in which the twist is easily eliminated, and the time until the tape 1 is stably driven can be shortened to about 0.2 to 0.5 sec. It was. Further, if the recording / reproducing state is maintained for a long time, the tape 1 is easily twisted between the capstan shaft 7 and the pinch roller 19 when the tape 1 is folded due to the accumulation of the twisting force of the tape 1. Another problem can also be avoided.

  In addition, although the effect | action by the said structure is not certain, the following is assumed. First, the pinch roller 19 can be tilted with respect to the capstan shaft 7 in a direction for correcting the twist of the tape 1. Further, since the center of the pinch roller bearing 5 is deviated from the center of the cylindrical holder 20 and the radius of the pinch roller bearing 5 is reduced by this deviation, the inclination of the pinch roller 19 with respect to the capstan shaft 7 is more reliably ensured. can do.

  In this embodiment, the pinch roller bearing is biased upward, and the inner peripheral surface of the hole of the pinch roller bearing is tapered so that the diameter decreases in the biasing direction, but depending on the direction of twisting of the tape, The pinch roller bearing may be biased downward, and the inner peripheral surface of the hole of the pinch roller bearing may be tapered so that the diameter decreases in the biasing direction.

  In this embodiment, the transition from the recording / playback stop state to the recording / playback state has been described as the device state transition. However, the transition from the fast-forward state to the recording / playback state, or the recording / playback state from the rewind state. Any case can be applied as long as the pinch roller moves from a state where the pinch roller is separated from the capstan shaft to a state where the pinch roller presses the capstan shaft.

  In this embodiment, the video camera is taken up. However, any device using a magnetic tape such as a stationary video recorder or a tape recorder may be used.

  The present invention is useful for an electronic device that uses a tape-shaped medium as an information medium.

Sectional drawing of the principal part in the pinch roller of this invention Main part plan view of a magnetic recording / reproducing apparatus provided with a pinch roller Main part plan view of a magnetic recording / reproducing apparatus provided with a pinch roller Sectional view of the main part of a conventional pinch roller

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tape 2 Pinch arm 3 Pinch roller shaft 4 Cylindrical elastic body 5 Pinch roller bearing 5a Inner peripheral surface of pinch roller bearing 6 Capstan 7 Capstan shaft 19 Pinch roller 20 Cylindrical holder

Claims (2)

A cylindrical holder for supporting a cylindrical elastic body;
A bearing portion that is fixed to the inner peripheral surface of the cylindrical holder and has a center hole that is rotatable about a central axis;
The height center of the bearing portion in the central axis direction is biased with respect to the height center of the cylindrical holder in the central axis direction,
An inner peripheral surface facing the central axis in the central hole is a pinch roller provided with a tapered shape having a diameter that decreases in a biasing direction of the bearing portion. A cylinder having a magnetic head for recording and reproducing a tape-like magnetic medium;
A rotation axis;
A pinch roller according to claim 1,
A magnetic recording / reproducing apparatus that presses and engages the cylindrical elastic body with the rotating shaft and guides the tape-shaped magnetic medium to the cylinder.

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