JPS62279548A - Reel base device for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To make a device small in size and thin in depth and improve the position precision of a reel base by rotating a rotating member having a pair of end face cam parts, which are formed in the peripheral direction and face each other, through a supporting shaft to raise/lower and hold the reel base in the vertical direction. CONSTITUTION:When a motor is rotated, a rotating member 21 is rotated through a gear 25. The shape of an end face camp part 21a brought into contact with a boss part 22a is changed according as the rotating member 21 is rotated, and a reel base 22 is raised or lowered in accordance with this shape. Since a reel base 14 is rotatably detained on a hollow shaft 13, the reel base 14 is raised or lowered along a supporting shaft 12 similarly to the reel base 22. The end face cam part 21a is provided with a flat part, and a sensor is provided which discriminates the position of the reel base 14 in accordance with the rotation position of the rotating member 21, and rotation and stop of the motor are controlled to hold the reel base 14 at a certain height. By this constitution, the device is made small in size and thin in depth and the position precision of the reel base is improved.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a magnetic recording device that can be moved up and down, which can be used in a video tape recorder, etc. to which a plurality of types of tape cassettes with different reel-to-reel dimensions can be attached. The present invention relates to a reel stand device of a playback device.

2. Description of the Related Art A conventional reel stand device of a magnetic recording/reproducing apparatus will be described. FIG. 3 is a longitudinal sectional front view of a conventional reel stand device for magnetic recording and reproduction, and FIG. 4 is a longitudinal sectional side view thereof. In FIG. 3, numeral 1 is a reel stand, which is locked to a shaft 2. In FIG. Reference numeral 3 denotes an end face cam which can slide on the base of 4 and supports the end face of the shaft 2. 6 is a knob, which is locked to the end cam 3. Reference numeral 6 denotes a bearing fixed to the base 4, and the shaft 2 is engaged with the bearing 6 so as to be vertically movable. A spring 7 biases the shaft 2 and the end cam 3 into contact with each other. Regarding the reel stand device of the conventional magnetic recording and reproducing device configured as described above, by operating the knob 6, the end face cam 3 slides on the base 4, and the end face in contact with the end face of the shaft 2 is moved. As the cam shape of cam 3 changes,
Axis 2 moves up and down. Since the reel stand 1 is locked to the shaft 2, the reel stand 1 also moves up and down at the same time. Konori-
By installing reel stand devices at several locations, engaging with a cassette (not shown) when the reel stand rises, and setting it at a lower height than the cassette when it falls, it can selectively hold several types of cassettes with different reel-to-reel dimensions. It will be possible. (Jitsukai 55th
-174768 Publication) Problems to be Solved by the Invention However, with the above configuration, the length of the shaft is longer than the stroke required for raising and lowering in the vertical direction via the bearing, which increases the height of the entire device. It is difficult to construct a structure with a low temperature. Furthermore, it is difficult to achieve horizontal positional accuracy of the reel stand, and other suitable adjustment means are required. In addition, the end cam presses the shaft to move it up and down, and also serves as a bearing to support the rotation of the shaft, so it has the problem of poor longevity and reliability. The present invention solves the above-mentioned problems, allows the height to be lowered, and improves the positional accuracy of the reel stand, while still providing separate locations for supporting the rotating shaft and for raising and lowering it. The present invention provides a magnetic recording/reproducing device with a long life and high reliability.

Means for Solving the Problems In order to solve the above-mentioned problems, the reel stand device of the magnetic recording/reproducing device of the present invention has a spindle mounted on a base, and a spindle that engages with the spindle in a vertical direction. a hollow shaft that can be raised and lowered; a reel stand that is rotatably locked around the hollow shaft; a rotating member having a pair of opposing end cam portions formed in a direction; a member that abuts the end cam portion of the rotating member and is locked to the hollow shaft; and a member that is always in contact with the rotating member. It is equipped with the means to make contact.

Effects of the present invention With the above-described configuration, the hollow shaft that is the axis of the reel stand can be shortened, and the height can be made low. By erecting the shaft, it is possible to easily achieve horizontal positional accuracy of the reel stand, and by separating the part that lifts and lowers the part that supports the rotation of the reel stand, the life and reliability are improved. be able to. Further, since the end face cam rotates with the rotation of the support shaft and is raised and lowered at two locations via the support shaft, it is possible to perform the raising and lowering operations smoothly and with high precision.

EXAMPLE Hereinafter, a reel stand device for a magnetic recording/reproducing apparatus according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional front view of a reel stand device of a magnetic recording/reproducing apparatus of the present invention, and FIG. 2 is a side view thereof. 1st
In the figure, 11 is a base. Reference numeral 12 denotes a support shaft, which is installed on the base 11. 13 is a hollow shaft;
2 and can be raised and lowered in the vertical direction. 14 is a reel stand. 16 and 16 are bearings, which are fixed to the reel stand 14. A reel hook 17 is biased upward by a spring 18, engages with a reel of a cassette (not shown), and transmits the rotation of the reel stand 14 to the reel. 1
Reference numeral 9 denotes a sleeve, which is locked to the hollow shaft 13. 2
0 is a spacer that supports the bearing 16. Reference numeral 21 denotes a rotating member, which engages with the support shaft 12 and is rotatable around the support shaft 12, and is connected to the end cam portion 21a and the gear portion 21.
It has b.

Reference numeral 22 denotes a reel stand base, which has boss portions 22a at two locations via the support shaft 12, contacts the end face cam portion 21a, and is latched to the hollow shaft 13.

23 spring, which biases the boss portion 22a and the end cam portion 21a so that they always come into contact with each other. Reference numeral 24 denotes a holder, which is elongated and has a boss portion 22a engaged with the elongated holder, and serves to prevent the reel stand base 22 from rotating. 25 is a gear, which meshes with the gear portion 21a of the rotating member 21. The gear 25 is connected to a motor (not shown).

The operation of the reel stand device of the magnetic recording device configured as described above will be explained. When a motor (not shown) is rotated, the rotating member 21 is rotated via the gear 26. When the rotating member 21 rotates, the shape of the end cam portion 21a that is in contact with the boss portion 22a changes, and the reel stand base 22 moves up and down according to the shape. Since the reel stand base 22 is locked to the hollow shaft 13 and the hollow shaft 13 is engaged with the support shaft 12, the reel stand base 22 moves up and down along the support shaft 12. Since the IJ-reel stand 14 is rotatably locked to the hollow shaft 13, it moves up and down along the support shaft 12 in the same way as the reel stand base.

A flat part is provided on the end cam part 21a, and the rotating member 21
By providing a sensor (not shown) that can be determined based on the rotational position of the motor and controlling the rotation of the motor,
4 can be held at a certain height. This flat portion may be provided to allow the reel stand to take the highest position and the lowest position. The end cam portion 21 is still attached at two locations via the support shaft.
Since the reel stand base 22 is raised and lowered by &, the raising and lowering operation of the reel stand is stable and smooth.

As described above, according to this embodiment, the support shaft 12 installed on the base 11, the hollow shaft 13 that engages with the support shaft 12 and is vertically movable, and the core hollow shaft 13 are rotatable. The locked reel stand 14 is engaged with the support shaft 12 and is rotatable around the support shaft 12, and a pair of opposing end surfaces formed in the circumferential direction via the support shaft. A rotating member 21 having a cam portion, a member 22 that abuts the end cam portion of the rotating member and is locked to the hollow shaft, and a spring 23 that keeps the member 22 in constant contact with the rotating member. As a result, the height can be reduced, the positional accuracy of the IJ-roll stand can be easily ensured, and the reel stand 14 can be smoothly raised and lowered while maintaining the accuracy. Further, the parts for raising and lowering the reel stand and the parts for supporting the rotating part of the reel stand are different, so that the life and reliability can be improved and the structure can be constructed in a relatively narrow space.

Effects of the Invention As described above, according to the present invention, the device can be constructed in a relatively narrow space and its height can be reduced, and the entire device can be made smaller and thinner.

Further, the positional accuracy of the reel stand can be easily increased, and the reel stand can be smoothly raised and lowered while maintaining that accuracy. Further, it is possible to obtain the excellent effect of improving lifespan and reliability.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a reel stand device of a magnetic recording and reproducing apparatus according to an embodiment of the present invention, and FIG. 11...Base, 12...Spindle, 13.
...Hollow shaft, 14...Reel stand, 15.
...bearing, 16...bearing, 17...
...Reel hook, 18...Spring, 19...
...Sleeve, 20...Spacer, 21...
... Rotating member, 22 ... Reel stand base,
23...Spring, 24...Holder, 26...
·····gear. Name of agent: Patent attorney Toshio Nakao and 1 other person11
--1 Base I2-11 Final Shift 15--East I Uke 16---H Uke/7-- Reel Hook

Claims (1)

[Claims] A support shaft planted on a base, a hollow shaft that engages with the support shaft and is vertically movable, a reel stand rotatably locked around the hollow shaft, and a reel stand that engages with the support shaft. a rotating member that is rotatable around the supporting shaft and has a pair of opposing end cam portions formed circumferentially through the supporting shaft; and a rotating member that abuts the end cam portion of the rotating member. The reel table also includes a member that is locked to the hollow shaft, and a means for bringing the member into constant contact with the rotating member, and by rotating the rotating member, the reel stand is raised and lowered in a vertical direction. A reel stand device for magnetic recording and reproducing equipment.