JPS6251060A - Reel stand device - Google Patents

Abstract

PURPOSE:To improve the workability of an assembling by providing the radial bearing of a reel board at two places, the upper and lower parts, of the reel board and providing a thrust bearing that is equipped with a ring-shaped member, the diameter of which is a little smaller than that of a fixed bearing at a space between the radial bearings, and is capable of the position adjustment in the axis direction on the upper part of the reel board. CONSTITUTION:At a reel board 2, a load in a thrust direction is received by a spherical plane provided at the tip end of a reel axis at the center part of a thrust receiver 9, and the load in a radial direction is received by a radial bearing receiving part provided at two places, the upper and the lower, of the reel board 2. A stopper 7 is inserted with pressure and fixed at the reel axis 1, however, it is not allowed to contact with the reel board 2, and therefore, the loss torque at the bearing of the reel board can be reduced and also, the reel board is abutted to the stopper 7, being prevented from falling out even when the device is set upside down. Also, when the reel board is required to be changed by some reasons, the reel board can be unloaded by pulling it up in the same manner as in the assembling because no steps are provided at the reel axis 1.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to the structure of a reel stand for holding a reel on which a magnetic tape is wound in a recording/reproducing device using a magnetic tape, and particularly relates to the structure of a reel stand that holds a reel on which a magnetic tape is wound. Regarding.

[Background of the invention]

Recording and reproducing devices that conveniently use magnetic tape, especially V'l'R
In video recorders, the reel stand is an important component that determines the running height of the magnetic tape for recording and reproducing video and audio signals. The reel stand was required to be able to adjust its height, have low bearing load torque during rotation, and be easy to assemble. Various reel stands have been devised for these.

Japanese Utility Model Publication No. 55-22605 proposes a reel stand structure that can be assembled and prevented from being pulled out with a simple configuration.However, in the above-mentioned known example, in order to prevent the reel stand from being pulled out, the reel rotating shaft is fixed. It is necessary to reduce the diameter of a part of the reel stand, and it is also necessary to provide a press-fit length for integrating the two reel stand components between both ends of the reel stand, and a bending part when inserting the reel stand. The distance between both bearings was large, making it unsuitable for downsizing.

In addition, for radial direction bearings, it is preferable for the reel shaft to have a smaller shaft diameter in order to reduce torque loss, but it is necessary to provide a stop next to the reel shaft as a stopper, and the strength of the groove is important when press-fitting the reel shaft into the board. The diameter of the bearing had to be large because it had to have enough strength to prevent bending. [Object of the Invention] An object of the present invention is to provide a reel shaft with a structure to prevent the reel stand from being pulled out. It is an object of the present invention to provide a reel stand device which does not require groove machining, prevents removal of a nine-reel stand by insertion in the axial direction, and improves assembly workability.

[Overview of the invention]

The present invention provides a straight (straight) reel shaft that supports the reel stand.
A suitable member press-fitted onto the reel shaft is provided between the radial bearings provided at both ends of the reel stand to prevent the reel stand from being pulled out and to allow assembly from the direction of the reel axis. This is what I did.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a side half-sectional view showing a reel stand according to the invention, and Fig. 2 is an exploded perspective view thereof. is a reel shaft that supports the reel stand 2, and the tip thereof is spherical and the other end is fixed to the substrate 10.
A cap 5 is press-fitted into one end of the cap 5 via a spring and pawl 4 and a thrust receiver 9, and a radial bearing 8 is press-fitted into the other end via a stopper 7. Upper part 2-1 of reel stand 2
has the shape of a hexagonal prism, and engages with the hexagonal shape provided inside the claw 4 with a gap, and the claw is urged upward by the spring 3. The rotation transmitted to the lower part 2-2 of the reel stand by an idler (not shown) is transmitted to the pawl 4, and the reel engaged with the pawl 4 is rotated. A threaded portion is provided in the center of the reel cap 5, and a screw 6 regulates the position of a thrust receiver 9 provided between the reel stand 2 and the reel cap 5. Further, the upper part of the reel stand 2 is integrally provided with a radial bearing part 2-5, and the lower part thereof has a stopper which is a suitable member having a split part with an inner diameter slightly smaller than that of the reel shaft 1. There is. The stopper 7 is held by a radial bearing 8 press-fitted into the lower part of the reel stand 2 with a gap in the axial and radial directions.

After assembling the reel stand, the installation into the reel shaft 1 provided on the board 10 will be described. With the height adjustment screw 6 of the reel stand moved upward, move the reel stand to the reel shaft 1.
At this time, the inner diameter of the stopper 7 is set to be smaller than the outer diameter of the reel shaft 1), and the slotted part of the stopper is pushed wide at the tip of the reel shaft 1.

Press-fitted along with the reel stand in the axial direction・After press-fitting, screw 6
When the screw 6 (1) is rotated and moved downward, the reel stand 2 is pulled upwards because the tip of the screw 6 (1) is in contact with the thrust receiver 9 and the reel shaft 1, and the reel stand 2 and the stopper 7, which were pushing the stopper 7, are pulled up. Contact is broken.

By adjusting the position of the screw 6, the height of the reel stand 2 is set to the designed height.

In this state, the load 1 in the thrust direction of the reel stand 2 is received by the spherical surface provided at the tip of the reel shaft at the center of the thrust receiver 9, and the load of the radial bearing is received at two locations above and below the reel stand 2. It is received by the radial bearing part. Although the stopper 7 is press-fitted onto the reel shaft 1, it does not contact the reel stand 2, so the bearing loss torque of the reel stand can be reduced, and even if the device is turned upside down, the reel stand will come into contact with the stopper 7 and the reel stand will not come into contact with the reel stand 2. never falls. In addition, even if it becomes necessary to convert the reel stand for some reason, since there is no step on the reel shaft 1, you can pull up the reel stand 2 with the same force as when installing it. It is possible to leave the area.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to assemble the reel stand before assembling it into the device, and it can be assembled into the device simply by inserting the reel in the axial direction, and by adjusting the height. At the same time, the reel stand can be prevented from being pulled out without providing a groove on the reel shaft.

In addition, since there is no need to provide a groove on the reel shaft, there is no need to bend the reel shaft during groove machining or when press-fitting the reel shaft into the board, and it can be assembled by simply inserting from the direction of movement. This has advantages such as being able to provide a reel stand device that is suitable for automatic assembly, and can also be made smaller.

[Brief explanation of the drawing]

FIG. 1 shows a half-sectional view of a reel stand according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. 2...Reel stand 3...Spring 4...Claw 5...Cap 6...Screw 7...Stopper 8 ...Bearing 9...Thrust bearing is active Ti

Claims (1)

[Claims] 1. In a fixed shaft and a reel stand rotatably supported by the fixed shaft, radial bearings of the reel stand are provided at two locations, above and below the reel stand, and between the radial bearings, from the fixed shaft diameter, A reel stand device characterized in that it has a ring-shaped member with a slightly smaller diameter and is provided with a thrust bearing on the upper part of the reel stand whose position can be adjusted in the direction of the rotation axis.