JPH06195812A - Tension regulator band adjusting mechanism - Google Patents

Abstract

PURPOSE:To eliminate the need of a dedicated adjusting screw driver and a lock screw and to reduce the number of parts and then to facilitate adjusting operation of a tension regulator band. CONSTITUTION:An adjusting block 1 with a fulcrum axis 3 as a turning fulcrum is provided with a cam hole 7, and this cam hole 7 is engaged with an eccentric can 9 provided eccentrically on a cam axis 8. The adjusting block 1 is operated to be turned by totating operation of this eccentric cam 9, and the tension regulator band 36 fixed to the adjusting block 1 is drawn or slackened, thus adjusting press-contacting force against a reel base.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension regulator band adjusting mechanism suitable for a reel stand of a video tape recorder (VTR) or the like.

[0002]

2. Description of the Related Art Generally, a video tape recorder (VT)
In a recording / reproducing apparatus such as R), in order to stably run the magnetic tape, it is necessary to run the magnetic tape with a proper tension applied.
The tension must be kept as constant as possible.

In particular, in a VTR or the like, it is an important condition that the magnetic tape is closely wound on the outer peripheral surface of the head drum to run when recording / reproducing information, and the tape tension is not appropriate. In this case, or when there is a large fluctuation, the winding state of the magnetic tape around the head drum becomes unstable, and accurate recording / reproduction of information cannot be performed.

Therefore, a conventional tape player in which a magnetic tape such as a VTR is wound obliquely around a rotary head and runs, is provided with a tape tension adjusting mechanism for keeping the tape tension substantially constant. .

For example, in the conventional tape tension adjusting mechanism 31, as shown in FIG. 5, a ten-legged pin 32 for suspending the magnetic tape T is erected on a ten-legged arm 33, and the ten-legged arm 33 is horizontally moved around a fulcrum shaft 34. It is rotatably attached, and a spring 35 applies an urging force in the direction in which the ten-legged pin 32 comes into contact with the magnetic tape T. Then, a ten-legged band 36 having one end fastened to the portion of the ten-legged arm 33 between the ten-legged pin 32 and the fulcrum shaft 34 is wound around the reel base 51, and the band 36
The other end of is connected to the adjustment block 37 which is supported on the chassis side.

The adjusting block 37 described above is die-cast or molded to form a chassis 38 as shown in FIG.
It is rotatably supported about a shaft 39 supported by the above, and the above-mentioned ten-legged band 36 is connected to the outside of the adjustment block 37 via a fixing metal fitting 40.

The adjusting block 37 is rotated and adjusted by rotating an adjusting driver 42 that meshes with a tooth portion 41 formed on the outer peripheral portion of the adjusting block 37 to adjust the pressure contact force of the tension band 36 with respect to the reel base 51. The adjustment block 37 is provided with a lock screw 44 inserted in an arc-shaped guide hole 43 centered on the shaft 39.
Can be fixed in its pivot position by tightening it on the chassis 38.

In the conventional tape tension adjusting mechanism configured as described above, when the tape tension is weakened from the state where the balance leg arm 33 is balanced by the urging force of the spring 35 and the pulling force by the balance leg band 36, the balance leg arm 33 causes the balance shaft 34 to move. 5, it rotates counterclockwise in FIG. 5, and by this rotation, the ten-legged band 36 is pulled and brought into pressure contact with the peripheral surface of the reel stand 51, the rotational torque of the reel stand 51 is reduced, and the tape tension is adjusted.

Further, when the tape tension becomes strong, the ten-legged arm 33 rotates clockwise around the fulcrum shaft 34 in FIG. 5, and this rotation causes the ten-legged band 3 to rotate.
6, the pulling is loosened, the pressure contact with the reel base 51 is loosened, the rotational torque of the reel base 51 is accelerated, and the tape tension is adjusted.

In the recording / reproducing apparatus, a vertical guide 52 for changing the traveling direction of the magnetic tape T is provided near the tape tension adjusting mechanism 31, and the head drum H is sandwiched between the vertical guides 52 in a substantially symmetrical manner. Fixed tilt guides 53, 53a for tilting the tape T are provided, and the head drum H
A roller guide 5 that winds the magnetic tape T obliquely with respect to and guides the magnetic tape T to return to the vertical state again.
4, 54a, roller guides 55, 55a and tilt guides 56, 56a are provided and arranged on a moving base (not shown).

The magnetic tape T is fed from the fixed tilt guide 53a through the capstan 57 and the moving guide 58 into the cassette C on the outlet side with respect to the head drum H, and wound on the take-up reel 59. ing.

[0012]

In the conventional tape tension adjusting mechanism constructed as described above, the adjusting block 37 is a die-cast or molded product as described above, and the adjusting block 37 is erected from the chassis 38. The rotation of the fulcrum shaft 39 is adjusted. Therefore, for the adjustment operation of the balance band 36 by the adjustment block 37, after the adjustment block 37 is positioned by the dedicated adjustment driver 42, the lock screw 44 is tightened with another tool while maintaining the state. Since the operation of fixing the adjustment block 37 was necessary, a dedicated adjustment driver 42 was required, and the adjustment block 3
There is a problem that the adjusting operation of 7 requires time and effort.

The present invention has been made to solve the above-mentioned problems, and it is possible to reduce the number of parts by eliminating the need for a dedicated adjusting screwdriver or lock screw, and to facilitate the adjusting operation. The purpose is to obtain a tension regulator band adjustment mechanism.

[0014]

In order to achieve the above object, a tension regulator band adjusting mechanism according to the present invention has a tension regulator band wound around a reel stand for adjusting tape tension. In the tension regulator band in which one end of the regulator band is connected to the adjustment block and the other end is connected to the tension regulator arm, the adjustment block is rotated by the cam mechanism to adjust the pressure contact force of the tension regulator band to the reel stand. It is the one.

[0015]

In the tension regulator band adjusting mechanism of the present invention constructed as described above, the adjustment block can be fixed in position at a position corresponding to the rotation angle of the cam mechanism by rotating the cam mechanism with a tool. .

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a tension regulator band adjusting mechanism according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a tension regulator band (hereinafter abbreviated as a ten-legged band) adjusting mechanism, a reel base and a tension regulator arm (hereinafter, referred to as a tension regulator band) in this embodiment.
2 is a plan view of the tenregi band adjusting mechanism, and FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2. Since the tenregi band adjusting mechanism of the present invention is the same as that of the conventional example, the same reference numerals are used. The overlapping description will be omitted.

1 to 3, reference numeral 1 is an adjustment block made of a sheet metal material, and the adjustment block 1 is supported by a fulcrum shaft 3 rotatably supported by a chassis 2 by outsert molding. More specifically, as shown in FIG. 4, the adjustment block 1 is formed with a fulcrum shaft hole 4 and a pair of retaining pieces 6 and 6 projecting toward the fulcrum shaft hole 4 side and having a notch groove 5. By press-fitting into the fulcrum shaft 3 described above, the retaining pieces 6 and 6 are bitten and fixed by the fulcrum shaft 3.

A long-hole-shaped cam hole 7 is formed in one end of the adjusting block 1 in the longitudinal direction thereof, and the cam hole 7 is eccentrically mounted on a cam shaft 8 rotatably supported on the chassis 2 by outsert molding. An integrally formed eccentric cam 9 is engaged. Specifically, the cam surface 9 a is engaged so that the remote portion of the farthest point b of the eccentric cam 9 from the center a of the cam shaft 8 corresponds to the longitudinal direction of the cam hole 7. A rotation groove 10 for a tool such as a driver is formed at the center of the eccentric cam 9.

The end portion of the balance band 36 is caulked and fixed to the fixing portion 11 formed on the other end side of the adjusting block 1 having the above-mentioned configuration, which is opposite to the cam hole 7.

In the balance band adjusting mechanism of the present invention having the above-described structure, when a tool is inserted into the rotation groove 10 of the eccentric cam 9 and the eccentric cam 9 is rotated clockwise,
The cam surface 9a presses the hole side 7a of the cam hole 7, whereby the adjustment block 1 on the side of the cam hole 7 rotates about the fulcrum shaft 4 in the direction of the solid line, so that the balance band 36 is fixed. The portion 11 rotates in the direction of the solid line arrow, and the ten-legged band 36 is pulled and strongly pressed against the reel base 51, causing the reel base 51 to exert a braking action.

When the eccentric cam 9 is rotated counterclockwise, the cam surface 9a presses the hole side 7b of the cam hole 7, whereby the adjustment block 1 on the cam hole 7 side is centered on the fulcrum shaft 3. Since it rotates in the direction of the dotted line arrow, the fixing portion 11 that fixes the balance band 36 rotates in the direction of the solid line arrow, and the balance band 36 relaxes and is loosely pressed against the reel base 51, and the braking action on the reel base 51 is relaxed. Act in the direction.

As described above, the balance band adjusting mechanism according to the present invention rotates the adjusting block 1 about the fulcrum shaft 3 only by rotating the eccentric cam 9 engaged with the cam hole 7 of the adjusting block 1 with a tool. Operate and reel stand 5
The pressure contact force of the balance band 36 with respect to 1 can be adjusted, and there is no need for screwing with a lock screw after adjusting the balance band.
The workability of adjustment can be simplified.

The cam shaft 8 and the fulcrum shaft 3 are the chassis 2
Since it is outsert molded, the number of parts at the time of assembly can be reduced and the cost can be reduced.

The present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.

[0026]

As described above, in the balance leg band adjusting mechanism of the present invention, the adjustment block is rotated by the cam mechanism to adjust the pressure contact force of the balance leg band with respect to the reel stand. It is not necessary to fix the adjustment block with a dedicated adjusting screwdriver for turning operation or a lock screw after adjusting the balance band, which has the effect of simplifying the adjustment work of the adjustment block.

[Brief description of drawings]

FIG. 1 is a plan view of a balance band adjusting mechanism, a reel base, and a tape tension adjusting mechanism in the present example.

FIG. 2 is a plan view of a balance band adjusting mechanism.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a perspective view in which an adjustment block, an eccentric cam, and a fulcrum shaft are separated.

FIG. 5 is a plan view of a conventional recording / reproducing apparatus.

FIG. 6 is a plan view of a conventional balance leg band adjusting mechanism.

[Explanation of symbols]

 1 adjustment block 2 chassis 3 fulcrum shaft 4 fulcrum shaft hole 6 retaining piece 7 cam hole 8 cam shaft 9 eccentric cam 9a cam surface 10 rotating groove 11 fixed part 36 tenregi band 51 reel stand

Claims (4)

[Claims] 1. A tension regulator band for adjusting tape tension, which is wound around a reel stand, has one end of the tension regulator band connected to an adjustment block and the other end connected to a tension regulator arm. In the tension regulator band, the adjustment block is rotated by a cam mechanism to adjust the pressure contact force of the tension regulator band with respect to the reel stand. 2. The adjusting block comprises a cam hole formed at a position apart from a fulcrum shaft serving as a rotation center, and an eccentric cam engaged with the cam hole, and the adjusting operation is performed by rotating the eccentric cam. 2. The tension regulator band adjusting mechanism according to claim 1, wherein the block is rotatable about a fulcrum shaft. 3. The tension regulator band adjusting mechanism according to claim 1, wherein the eccentric cam is rotated by a tool. 4. The tension regulator band adjusting mechanism according to claim 1, wherein the eccentric cam is outsert-molded on the chassis.