JPH083929B2 - Rail stand device for magnetic recording / reproducing apparatus - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel stand device that can be used in a magnetic recording / reproducing apparatus such as a video tape recorder using cassette tapes having different reel-to-reel dimensions.

2. Description of the Related Art FIGS. 3 and 4 show a reel stand of a conventional magnetic recording / reproducing apparatus. FIG. 3 is a vertical sectional front view showing the structure of the reel stand, and FIG. 4 is a vertical sectional side view thereof. In FIG. 3, reference numeral 1 is a reel stand, which engages with a reel in a cassette (not shown). Reference numeral 2 is a shaft of the reel base 1, and the reel base 1 is locked to the shaft 2. 3 is an end face cam,
By supporting the shaft 2 in the vertical direction and operating the knob of 5, it is possible to slide on the base of 4.
Reference numeral 6 denotes a bearing for the shaft 2. The shaft 2 is slidable in the vertical direction, and is also urged by the spring 7 so as to come into contact with the end face cam 3. In the reel base device of the conventional magnetic recording / reproducing apparatus configured as described above, by operating the knob 5, the reel base 1 can be raised and engaged with the reel in the cassette (not shown) to rotate integrally. In addition, it is possible to lower the reel stand 1 to avoid interference with the cassette. In the above operation, there are several kinds of cassettes having different reel-to-reel sizes, the reel stand device is provided at a position where the reels of these cassettes can be engaged, and the reels of each cassette are selectively reeled. This is done when the table is engaged.

Problems to be Solved by the Invention However, in the above-mentioned configuration, the strokes required to move up and down through the bearings are required,
Since the length of the reel base shaft must be sufficiently long and a large space is required in the height direction, the entire device cannot be made thin. Further, when the reel base shaft rotates, there is a drawback that the reel base shaft and the like are easily worn because the end surface cam portion supports the rotation shaft. Further, it is difficult to accurately position the reel base in the horizontal direction, and there is a problem that another adjusting means is required.

In view of the above problems, the present invention reduces the space required in the height direction to reduce the thickness of the device, allows the reel base to be easily and accurately positioned in the horizontal direction, and rotates the reel base. (EN) A reel base device for a magnetic recording / reproducing apparatus, in which reliability is improved and a lifting operation is smoothed by separating a supporting portion and a lifting portion.

Means for Solving the Problems In order to solve the above problems, a reel base device of a magnetic recording / reproducing apparatus of the present invention comprises a support shaft implanted on a base and a support shaft slidable only in a vertical direction. A hollow shaft engaged with the shaft, and a reel base mounted rotatably around the hollow shaft,
A first member that engages with the support shaft and is slidable in a horizontal direction and that has a pair of end face cam portions that are formed to face each other in parallel with the sliding direction via the support shaft; It is provided with a second member that abuts on the end surface cam portion of the first member and is locked to the hollow shaft, and a means that can always abut the second member to the first member.

With the above-described structure, the present invention can reduce the space required in the height direction by installing the shafts concentrically, and it is possible to reduce the thickness of the entire device, and the portion that rotatably supports the reel stand. And the parts to be lifted up and down are the lifespan. By increasing the reliability and planting the support shaft on the base, and by providing the reel base concentrically with the support shaft, it is possible to easily perform highly accurate positioning in the horizontal direction. Also,
Since it has means for raising and lowering in two places via the shaft,
The raising / lowering operation becomes smooth, and since the member to be raised / lowered is engaged with the support shaft, it can be raised / lowered with high precision.

Embodiment Hereinafter, a reel base of a magnetic recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a reel stand of a magnetic recording / reproducing apparatus of the present invention. FIG. 2 is a sectional view thereof. 11 is a base and 12 is a support shaft, which is planted in the base 11. Numeral 13 is a hollow shaft which is engaged with the support shaft 12 and slidably movable up and down in the vertical direction. 14 is a reel stand, and the bearings 15 and 16 are locked to the reel stand 14,
It is mounted rotatably around a hollow shaft 13. A reel hook 17 engages with a reel of a cassette (not shown) and transmits the rotation of the reel base 14 to the reel. Reference numeral 18 denotes a spring, which biases the reel hook 17 upward. A spacer 19 supports the bearing 16. Reference numeral 20 denotes a sleeve, which is locked to the hollow shaft 13 so that the reel base 14 is
It prevents it from coming off.

21 is a first member that can slide in the horizontal direction,
The a and the support shaft 12 are engaged. The first member 21 has a pair of end-face cam portions 21b having the same shape with the support shaft 12 interposed therebetween. 2
Reference numeral 2 denotes a second member, which is locked to the hollow shaft 13 and is provided with a pair of projections 22a having curved surfaces, and is configured such that the projections 22a and the end surface cam portion 21b come into contact with each other. ing. Reference numeral 23 denotes a spring, which biases the second member 22 downward so that the projection 22a and the end surface cam portion 21b are always in contact with each other.

In FIG. 1, reference numeral 26 denotes a gear, which meshes with a rack portion 21c provided on the first member 21. Here, the hollow shaft 13 is prevented from rotating by the action of the spring 23 and the like, so that the protrusion 22a of the second member 22 does not come off from the end face cam portion 21b, and is slid only in the vertical direction with respect to the support shaft 12. It is movable.

In the reel base device of the magnetic recording / reproducing apparatus configured as described above, when the gear 26 is rotated clockwise by the motor (not shown), the first member 22 moves leftward.
When the end surface cam portion 21b that comes into contact with the protrusion 22a becomes an inclined portion,
The second member 22 moves downward because it is biased downward by the spring 23. The second member 22 is locked to the hollow shaft 13, while the reel base 14 is also rotatably attached to the hollow shaft 13 and thus descends. When the end surface cam portion 21b that abuts the protrusion 22a becomes a flat portion, the second member 22 is held and the reel base 14 is also held. On the other hand, when the gear 26 rotates counterclockwise, the second member and the reel stand are held up along the shape of the end face cam portion 21b. Lifting of the reel stand 14 described above
Since it is performed by engaging with the support shaft 12 via the hollow shaft 13, it is possible to maintain the positional accuracy. The rotation stop control of the motor is performed by stopping the motor after rotating for a certain period of time, but by providing a sensor that can detect the position of the first member 21, it is possible to accurately control the rotation stop of the motor. Become.

As described above, according to the present embodiment, the support shaft implanted on the base, the hollow shaft that engages with the support shaft and is vertically movable, and is rotatably mounted around the hollow shaft. A reel base and a pair of end face cams that are engaged with the support shaft and are slidable in the horizontal direction, and that are provided so as to face each other in parallel with the sliding direction via the support shaft. The first member, the second member that is in contact with the first member and is locked to the hollow shaft, and the means that can always contact the second member with the first member, It is possible to reduce the space occupied by the device, reduce the thickness of the device, and easily achieve the positional accuracy of the reel stand. Further, it is possible to improve the reliability by separating the portion for rotating and supporting the reel base and the portion for moving up and down. Further, since the reel stand is configured to be lifted and lowered at two places via the support shaft, it is possible to perform a smooth lifting operation, and the member for raising and lowering is engaged with the support shaft to slide. Therefore, it is possible to raise and lower with high accuracy.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to make the device lower in the height direction, and it is possible to reduce the thickness of the entire device. Also,
The positional accuracy of the reel stand can be easily obtained, and the reel stand can be smoothly moved up and down while maintaining the accuracy. In addition, since the portion for rotating and supporting the reel base is different from the portion for moving up and down, it is possible to obtain many excellent effects such that the life and reliability can be improved.

[Brief description of drawings]

1 is a plan view of a reel stand of a magnetic recording / reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view of FIG. 1, and FIG. 3 is a vertical sectional view of a reel stand of a conventional magnetic recording / reproducing apparatus. FIG. 4 is a vertical side view of FIG. 11 …… Chassis, 12 …… Spindle, 13 …… Hollow shaft, 14 …… Reel stand, 15 …… Bearing, 16 …… Bearing, 17 …… Reel hook, 18 …… Spring, 19 …… Spacer, 20 ...... Sleeve, 21
...... First member, 22 ...... Second member, 23 ...... Spring, 24 ...
… Spindle, 25 …… Spring hook.

Claims (1)

[Claims] 1. A support shaft planted on a base, a hollow shaft slidably engaged with the support shaft only in a vertical direction, and a reel base rotatably mounted around the hollow shaft. A first member that engages with the support shaft and is slidable in the horizontal direction and that has a pair of end face cam portions that are formed to face each other in parallel with the sliding direction via the support shaft, A second member that abuts on the end surface cam portion of the first member and is locked to the hollow shaft; and a means that constantly biases the second member in a direction to abut the first member. And a structure in which the reel base is vertically moved up and down by sliding the first member in the horizontal direction.