JPH0341652A - Reel base - Google Patents

Abstract

PURPOSE:To surely transfer the turning force to a reel by providing a driving claw provided on a reel base, a reel placing part consisting of a high frictional part for placing the reel, and a reel height control part which cam move in the vertical direction from the reel placing part by interlocking with the driving claw. CONSTITUTION:In the center axis 28 formed as one body with a reel base 27, a driving claw 29 is placed at an equal interval in the peripheral direction, and on the reel base 27, a reel placing part 32 consisting of a high frictional member such as a rubber material, etc., is provided in a position for placing a reel 21. Also, a reel height control part 29a consisting of a low frictional member is protruded and provided in an area of the reel placing part 32 as one body with the driving claw 29. Accordingly, by rotation sliding of the reel height control part 29a and the reel 21 executed by a rotational operation of the reel 21 or the reel base 27, the driving claw 29 and a groove to be driven can be set easily to a fitting state. In such a way, the rotation of the reel base 27 can be transferred surely to the reel 21.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a reel stand used in a magnetic recording/reproducing device.

2. Prior Art As a conventional reel stand, for example, Japanese Patent Application Laid-Open No. 61-2692
It is shown in Publication No. 51.

FIGS. 5 and 6 are vertical sectional views of this conventional reel stand. In FIGS. 5 and 6, a tape 2 is wound around a tape reel l, and a driven claw 4 is located in the center hole 3 of the tape 2.
are arranged at equal intervals. Further, a pressing piece 6 is provided on the upper part of the cassette 5, and presses the tape reel 1 downward by the biasing force of a compression spring 7. The reel stand 8 is provided with a high friction member 9 at the position where the tape reel 1 is placed, and the central shaft portion 10 of the reel stand 8 is always urged outward by a spring 11 and is arranged at regular intervals. A plurality of drive claws 12 are provided. Further, the reel stand 8 is provided with a fitting height regulating convex portion 13.

The reel stand 8 is integrally attached to a motor shaft 14 for rotational driving.

In the conventional reel stand as described above, when the tape reel 1 is mounted on the reel stand 8, the phase at which the driven claw 4 of the tape reel 1 and the driving claw 12 of the reel stand 8 should engage is determined. If the driving pawl 12 is in a misaligned position, the driving pawl 12
It is pushed inward and retracted (Figure 5). At this time, the tape reel 1 is connected to the lower end of the driven claw 4 and the reel stand 8.
It is supported in a state where the upper fitting height regulating convex part 3 is in contact with it.

In other words, the surface 1a of the tape reel 1 that should originally be supported and the high friction member 9 on the reel stand 8 are in a non-contact state. Then, when the tape reel 1 or the reel stand 8 starts rotating in the next operation, the tape reel 1 slides and rotates on the fitting height regulating convex part 13, and the driven claw 4 and the driving claw 12 are in the phase at which they should be engaged. This will result in a mated state. As a result, the fitting height regulating convex portion 13
enters the recess between the driven claws 4, and the tape reel 1 is supported by the high friction member 9 on the reel stand 8. However, in the above configuration, when the tape reel is mounted on the reel stand, As a method of separating the high friction member on the reel stand and the tape reel when the driven claw on the reel side and the drive claw on the reel stand side are not aligned, a height regulating protrusion is fitted to the lower end of the driven claw. Therefore, if a cassette with a high driven claw height is used, the gap between the reel stand and tape reel will be extremely wide and an abnormal pressing force will be applied to the reel, resulting in damage to the reel or When using a cassette with a low driven claw height, the reel may become unstable due to contact between the lower surface of the reel and the high friction member of the reel stand even though the driven claw and the driving claw are not engaged. It had problems such as being in a driving state.

In view of the above, the present invention ensures the engagement of the driving pawl and the driven pawl when driving the reel without depending on the height of the driven pawl of the tape reel, and also ensures that the reel is securely attached to the reel by the reel stand. The purpose of the present invention is to provide a reel stand that transmits rotational force.

Means for Solving the Problems The present invention provides a drive pawl provided on a reel stand, a reel placement part made of a high friction member for placing a reel, and a reel placement part that works in conjunction with the drive pawl. The reel stand includes a reel height regulating section that is movable in the vertical direction from the placing section.

Function: With the above-described configuration, the reel height regulating portion protrudes a certain amount above the reel mounting portion in conjunction with the driving pawl when the driving pawl and the driven groove of the reel are in a non-fitting state. Therefore, the reel can be spaced a certain distance from the high friction member on the reel stand, regardless of the height of the driven claw of the reel. Then, during the next rotational operation of the reel or reel stand, the reel height regulating portion and the reel rotate and slide, thereby easily bringing the driving pawl and the driven groove of the reel into a fitted state.

Embodiment FIG. 1 shows a longitudinal sectional view of a reel stand in the first embodiment of the present invention, and FIG.
FIG. In FIGS. 1 and 2, the reel 21
A magnetic tape 22 is wound around. A plurality of driven grooves 24 are provided in the center hole 23 of the reel 21 at equal intervals in the circumferential direction.

Each of these driven grooves 24 is connected to each adjacent driven claw 24.
It is formed by a. Further, a leaf spring 26 having one end fixed to the cassette 25 is provided above the reel 21.
This plate spring 2e urges the reel 21 downward. On the other hand, drive claws 29 are arranged at equal intervals in the circumferential direction on a central shaft 28 that is integrally formed with the reel stand 27. Each driving claw 29 is always urged outward by a leaf spring 3-0 whose one end is fixed on the reel stand 27. Drive claw 29
is rotatable around an axis 31. A reel mounting portion 32 made of a high friction material such as a rubber material is provided on the reel stand 27 at a position on which the reel 21 is mounted. Reel stand 27
A cap 33 is attached to the top. The reel stand 27 is fixed to a shaft 34 of a motor (not shown). A reel height regulating portion 29a made of a low-friction member and integrally formed with the driving claw 29 is provided to protrude into the region of the reel mounting portion 32. Note that the tip end portion 29b of the drive claw 29 that contacts the driven claw 24a is also made of a low-friction member.

Further, the shaft 31 is supported by a bearing 35 formed on the reel stand 27 (FIG. 3).

Regarding the reel stand of this embodiment configured as above,
The operation will be explained below.

1 and 4, the reel stand of the cassette 25, 2
7, if the circumferential phases of the driven groove 24 on the reel 21 side and the driving claw 29 on the reel stand 27 side match, the driving claw 29 will fit into the driven groove 24. In this state, the reel 21 is attached to the reel stand 27, and the reel 21 is attached to the reel stand 27.
1 and the reel mounting portion 32 come into contact with each other (
Figure 1).

Therefore, when the reel stand 27 rotates in this state, the reel 2
1 and the reel stand 27 are in a stable frictional connection state due to the high friction member, and reliable rotation can be transmitted to the reel 21.

However, when the cassette 25 is attached to the reel 21, the driven groove 24 on the reel 21 side and the drive claw 2 on the reel stand 27 side
9 have different phases in the circumferential direction, as the reel 21 descends, the driving claw 29 is moved inward of the center shaft 28 by contact with the driven claw 24a forming the driven groove 24 of the reel 21. It is rotated against the biasing force of the leaf spring 30. At the same time, the reel height regulating section 29a is in a state of protruding upward from the reel mounting section 32. Then, when the reel 21 further descends, the reel 21 moves to the reel height regulating section 29a.
It stops in a state where it is supported by (Fig. 4). When the reel stand 27 rotates in this state, the reel 21 slides easily because it is supported on the reel height regulating part 2ea made of a low-friction member, and as a result, the drive claw 29 rotates clockwise. The driven groove 24 and the driving claw 29 are in a fitted state,
At the same time, the reel height regulating section 29a is pushed out from the reel mounting section 32, and the lower surface 21a of the reel 21 and the reel mounting section 32 come into contact (FIG. 1). Therefore, when the reel stand 27 rotates in this state, the reel 21 and the reel stand 27 are in a stable frictional connection state due to the high friction member, and the rotation of the reel stand can be reliably transmitted to the reel 21.

As described above, according to the present embodiment, when the driving claw 29 and the driven groove 24 are in a non-fitting state, the reel height regulating part 29a is moved from the reel mounting part 32 in conjunction with the driving claw 29. Since the reel 2 protrudes upward by a certain amount from the reel mounting section 32,
1 is separated by a certain amount, and the reel height regulating portion 29a and the lower surface 21a of the reel 21 are smoothly rotated and slid by the subsequent rotational operation of the reel stand 27, so that the driving claw 29 and the driven groove 24 can be easily connected to each other. can be in a mated state.

As a result, the reel 21 is in a stable frictional connection state with the reel mounting portion 32 made of a high-friction member of the reel stand 27,
The rotation of the reel stand 27 can be reliably transmitted to the reel 21.

In this embodiment, the reel height regulating section 29a is integrally constructed with the drive pawl 29, but the reel height regulating section and the driving pawl may be provided as separate members so as to interlock with each other.

Effects of the Invention As described above, according to the present invention, when the cassette is mounted on the reel stand, the height of the reel that protrudes or retreats from the reel mounting portion in conjunction with the fitted state of the driven groove of the driving claw. By providing the regulating member, the reel can be reliably mounted on the mounting part made of a high friction material on the reel stand without depending on the height of the driven pawl of the reel, and the rotation of the reel stand can be ensured. It can be transmitted to the reel.

In particular, in normal use, the reel stand and reel respond almost integrally to the rapid start-up of reel rotation or the movement of reel rotation accompanying a rapid mode transition, so there is Its practical effects are great, such as being able to realize extremely stable tape running without generating vibrations.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of a reel stand showing one embodiment of the present invention, Fig. 2 is a sectional view taken along arrow A-A in Fig. 1, and Fig. 3 is a reel stand with the cap removed, showing the same embodiment. floor plan,
FIG. 4 is a longitudinal cross-sectional view showing the fitted state of the reel, and FIGS. 5 and 6 are longitudinal cross-sectional views showing a conventional reel stand. 21... Reel, 21a... Reel bottom surface, 24
...Driven groove, 25...Cassette, 27...
- Reel stand, 29... Drive pawl, 31... Shaft, 32... Reel mounting section.

Claims (1)

[Claims] A plurality of drive pawls are arranged at equal intervals around the outer periphery of the central axis of the reel stand and can be engaged with driven grooves of the tape reel, and a height provided on the reel stand for placing the tape reel. It is composed of a reel mounting section made of a friction member, and a reel height regulating section that is movable up and down from the surface of the reel mounting section in conjunction with the drive claw, and is configured to control the driven position of the tape reel when the cassette is installed. When the drive groove and the drive pawl are in a disengaged state, the tape reel is supported by the reel height regulating section, but the drive pawl is moved by the subsequent rotational movement of the reel stand. The reel stand is characterized in that when the reel height regulating part is fitted into the groove, the reel height regulating part retreats from the surface of the reel mounting part, and the tape reel is supported by the surface of the reel mounting part.