JPS63201940A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To directly connect a loading/unloading function and a mode generating function so as to interlock and operate them and to considerably reduce parts by elastically interlocking a loading ring and a tape pulling member by means of a pressure link to which a pressure spring is provided. CONSTITUTION:The position of a link shaft 11 when the loading ring 2 turns and a connection shaft 17 moves to nearly the center of the oblong hole 13 of the pressure link 12 is set to B, and the position of the link shaft 11 when the loading ring 2 turns and the connection shaft 17 moves to the end of the oblong hole 13 is set to C. After the tape pulling member 14 is abutted on a catcher 35 and a shift is locked, the pressure spring 18 extends due to the turn of the loading ring 2, and the tape pulling member 14 is brought into contact with pressure by the catcher 35 through a vertical post 15 and is positioned. For generating respective modes, the form of a Geneva cam 20 and the positions of pins 23 and 30 are set in such a way that a system goes to a rewind mode when the link shaft 11 is in the position B, and a reproducing mode when in the position C, for example.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a video tape recorder (hereinafter referred to as VTR).
The present invention relates to a magnetic recording/reproducing apparatus, and more particularly to a magnetic recording/reproducing apparatus in which loading and unloading of a magnetic tape and various mode forming operations are performed by the same drive source.

(Prior Art) Conventionally, in a VTR, a mechanism for pulling out a magnetic tape from a cassette and loading or unloading it onto a rotating cylinder equipped with a magnetic head, and a mechanism for forming each mode such as recording and playback are independent of each other. It was driven.

For this reason, for example, in the recording, playback, and pause modes, even if the position of the tape pull-out member is the same, each mode can be formed independently. Conventionally, the following three methods have been mainly used for this purpose.

The first method is to drive the rotary cam that forms the mode and drive the loading/unloading mechanism using separate power systems. In the second method, the rotary cam and the loading/unloading mechanism are driven by the same power source, and a power switching mechanism is provided therein. The third method is roughly the same as the second method.
Similarly to the method described above, the rotary cam and the loading/unloading mechanism are driven by the same power source, and as shown in FIG. This is an intermittent gear. According to this third method, during the loading/unloading operation, the gear 1a meshes with the gear 2a provided on the outer periphery of the loading ring 2, and the rotation of the motor 3 rotates the loading ring 2 by a predetermined angle. do.

When this rotation at a predetermined angle is completed, the notched portion 1b of the gear of the rotary cam plate 1 faces the loading ring 2,
The rotating cam plate 1 rotates, but the loading ring 2 is stationary. Cam groove 1 formed in rotating cam plate 1 during this time
The logic lever 4 rotates as guided by C to form various modes.

However, according to the first method above, a motor is normally used as the driving source for loading and unloading, and a motor or a solenoid is used as the driving source for each mode forming mechanism, and the driving sources are two.
Therefore, there was a problem that cost and space increased. Furthermore, according to the second method, a switching mechanism is required, which increases the number of parts and space. Generally speaking, according to the third method, most of the angle of the rotating cam is required for loading and unloading, and mode formation must be performed using the remaining angle. For this reason, the pressure angle on the cam surface increases, and in order to obtain a large gain, the diameter of the rotating cam must be increased, which requires a large space, which is disadvantageous to miniaturization and lightness. Ta.

(Problems to be Solved by the Invention) The present invention solves the problems of conventional magnetic recording and reproducing devices when attempting to drive the loading/unloading mechanism and each mode forming mechanism independently. This solves the problems of increased space and increased pressure angle on the cam surface of the rotating cam, reduces the parts installation space and the number of parts, and allows loading and unloading without damaging the conventional mechanism.
It is an object of the present invention to provide a magnetic recording/reproducing device that can independently drive unloading and mode forming operations.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention extracts a magnetic tape stored in a cassette from the cassette and transfers it to a rotating cylinder equipped with a magnetic head. a pair of tape pull-out members to be wound; a pair of loading rings to which the pair of tape pull-out members are respectively connected and rotate in opposite directions; and a plurality of types of In the magnetic recording/reproducing apparatus, the magnetic recording and reproducing apparatus is equipped with a mode forming means for forming a mode, and a surplus pressure link that elastically connects the tape withdrawal member and the loading ring via a surplus pressure spring; The apparatus is provided with a catcher that locks at the position, and a drive means that engages with the loading ring and drives the mode forming means.

(Function) According to the above configuration, when the pair of loading rings rotates in opposite directions and the tape pull-out member connected to these loading rings is stopped at a predetermined position by the catcher, the loading is carried out roughly. Even if the ring continues to rotate, the extra pressure link that slidably guides the tape pull-out member is movable together with the loading ring. At this time, the tape pull-out member is in contact with the catcher due to the extra pressure spring, and is stopped at a predetermined position.

By rotating the loading ring while the tape pull-out member is stopped and stopped by the catcher, another mode can be formed via the mode forming means that is engaged with the loading ring.

(Example) Hereinafter, an example of a magnetic recording and reproducing apparatus according to the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 and 2. FIG.

In these figures, parts that are the same or equivalent to those of the conventional example shown in FIG. 3 are designated by the same reference numerals. A worm 6 fixed to the drive shaft 5 of the motor 3 meshes with a gear 2a formed on the outer periphery of the loading ring 2 via a gear 7.8. This loading ring 2 is arranged concentrically with a rotating cylinder 9 on which a magnetic head (not shown) is mounted.
, 2d, which are rotated in opposite directions by the motor 3 via a mechanism not shown. 1 pair of loading rings 2u, 2d
At predetermined positions of the arms 10 are respectively protruded from the outer periphery.
u.

10d is fixed, and these arms 10u, 10
A link shaft Ilu, 11d is installed in each of the link shafts Ilu and 11d. These link shafts 11u, lid
One end of the extra pressure links 12u and 12d is rotatably attached to the top. Since the excess pressure links 12u and 12d are formed substantially symmetrically, one of the excess pressure links 12tj will be explained. A long hole 13 is formed near one end of the excess pressure link 12 on the opposite side to the one end to which the link shaft 11 is attached. On the other hand, tape drawer member 14
is slidably guided in a guide groove (not shown) formed concentrically with the rotating cylinder, and a vertical post 15 and an inclined post 16 are provided upright on which a magnetic tape (not shown) slides. Further, the tape pull-out member 14 has the extra pressure link 1
A connecting shaft 17 that slidably engages with a long hole 13 formed in 2 is fixed.

One end of the extra pressure spring 1B is fixed to the link shaft 11, and the other end of the extra pressure spring 1B is attached to the link shaft 17, and biases the tape pull-out member 14 in a direction toward the link shaft 11 via the link shaft 17. are doing.

A post 19 is installed on the opposite side of the loading ring 2u to the side where the arm 10u is provided, and can engage with the cam surface of a Geneva cam 20 rotatably provided on the main body of the device. There is. A part of the outer periphery of the Geneva cam 20 has a convex portion 20 that engages with one end of the soft brake 21.
a is formed so that rotation of the reel stand 22 is braked at a position where the Geneva cam 20 has rotated by a predetermined angle. Also, the pin 23 implanted in the Geneva cam 20
One end of a lever 24 is rotatably attached to the lever 24, and a pinch arm 26 is connected to the other end of the lever 24 via a pin 25 that engages with an elongated hole 24a. As the Geneva cam 20 rotates, the pinch roller 27 provided on the pinch arm 26 and the capstan 28 come into contact with each other and separate from each other. A spring 29 is suspended between the pin 23 and the pin 25 and biases the pinch roller 27 in a direction to bring it into contact with the capstan 28. Furthermore, one end of a tension release lever 31 is engaged with a pin 30 implanted in the Geneva cam 20. This tension release lever 31 is supported through long holes 31a and 31b formed in this lever 31 by pins 32 and 33 provided on the main body of the device so as to be capable of linear movement. A tension lever 34 is connected to the other end of this tension release lever 31, and a tension lever 34 is connected to the other end of the tension release lever 31.
The tension lever 34 is actuated by the rotation of the tension lever 34. Note that 35 is a catcher that locks the tape pull-out member 14 in a predetermined position.

Next, the operation of this embodiment will be explained. A magnetic tape stored in a cassette (not shown) is pulled out from the cassette by rotation of the motor 3, which rotates the tape pull-out member 14 via the loading ring 2. Then, it is wound around the rotating cylinder 9. When winding of the magnetic tape to a predetermined position on the rotary cylinder 9 is completed, the tape pull-out member 14 moves to the vertical post 15.
It comes into contact with a catcher 35, which has been provided in advance at a predetermined position, through which the movement is stopped. Let A be the position of the link shaft 11 in this position. The position of the link shaft 11 when the loading ring 2 roughly rotates and the connecting shaft 17 provided on the tape pull-out member 14 comes to approximately the center of the elongated hole 13 of the excess pressure link 12 is defined as B. Further, the position of the link shaft 11 when the loading ring 2 rotates roughly and the connecting shaft 17 comes to the end of the elongated hole 13 is defined as C. After the tape pull-out member 14 comes into contact with the catcher 35 and its movement is stopped, the extra pressure spring 18 is extended by the rotation of the loading ring 2.
The tape pull-out member 14 is pressed against the catcher 35 with a constant force through the vertical post 15, and is securely positioned.

In addition, each mode is formed by adjusting the shape of the Geneva cam 20 and the position of the pins 23 and 30 so that the link shaft 11 is in the rewind mode when it is in the position B, and it is in the playback mode when it is in the position C. This is done by setting. That is, in position B, the Geneva cam 20 rotates in the direction of the arrow, and the pin 23, lever 24, and pin 25
The pinch arm 26 rotates in the direction of arrow E through the pinch roller 27, and the pinch roller 27 is pressed against the capstan 28. At this time, one end of each of the soft brake 21 and the tension release lever 31 is connected to the convex portion 20 of the Geneva cam 20.
a and the pin 30, and the soft brake 21
brakes the reel stand 22, and the tension release lever 31 releases the action of the tension lever 34.

In addition, when the link shaft 11 is in the regeneration mode at position C, the Geneva cam 20 rotates roughly in the direction of the arrow.
As shown in FIG. 1, the convex portion 20a of the Geneva cam 20 engages with one end of the soft brake 21. As shown in FIG. Then, the soft brake 21 is rotated in the direction of arrow F to release the brake on the reel stand 22. At the same time, one end of the tension release lever 31 is released from the Geneva cam 20 k: t! ml pin 30
The tension release lever 31 is moved in the direction of arrow G, and the tension lever 34 is activated.

According to this embodiment, even after the loading ring 2 rotates and the tape pull-out member 14 comes into contact with the catcher 35, the loading ring 2 remains roughly within the range of the elongated hole 12a formed in the excess pressure link 12. Since the loading ring 2 can be rotated during that time, the Geneva cam 20f can be rotated to form at least two modes, for example, return mode and regeneration mode. Moreover, this mode creation function is directly connected to the loading/unloading function and operates in conjunction with it, making it possible to significantly reduce the number of parts.

In the embodiment described above, the Geneva cam 20 is rotated by the rotation of the loading ring 2 to form two modes of rewinding and playback, but this mode forming means is different from that shown in this embodiment. It is not limited.

[Effects of the Invention] As described above, according to the present invention, a loading ring and a tape pull-out member for loading or unloading a magnetic tape onto or from a rotating cylinder in a magnetic recording/reproducing apparatus are connected by an extra pressure link provided with an extra pressure spring. Since they are elastically connected, the loading/unloading function and the mode creation function can be directly connected and operated in conjunction with each other, making it possible to significantly reduce the number of parts. Moreover, it is possible to form at least two types of modes while the tape pull-out member is crimped and fixed at a predetermined position.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the magnetic recording/reproducing device according to the present invention, FIG. 2 is a perspective view showing the main parts of FIG. 1, and FIG. 3 is a plan view showing a conventional magnetic recording/reproducing device. It is. 2...Loading ring 9...Rotating cylinder 12...Extra pressure link 14.
... Tape pull-out member 15 ... Vertical post 18 ...
Extra pressure spring 20...Geneva cam (driving means) 35...Catcher agent Patent attorney Nori Chika Yudo Hiroshi Uji

Claims (2)

[Claims] (1) A pair of tape pull-out members that pull out a magnetic tape stored in a cassette from the cassette and wind it around a rotating cylinder on which a magnetic head is mounted, and the pair of tape pull-out members that are connected to each other and are opposite to each other. Rotate in the direction 1
In a magnetic recording/reproducing device comprising a pair of loading rings and a mode forming means for forming a plurality of modes in conjunction with at least one of these loading rings, the tape pull-out member and the loading ring are connected by an extra pressure spring. a catcher that locks the tape pull-out member in a predetermined position; and a drive means that engages with the loading ring and drives the mode forming means. A magnetic recording/reproducing device characterized by: (2) The magnetic recording and reproducing apparatus according to claim 1, wherein the driving means for driving the mode forming means is a Geneva cam that engages with a post installed in the loading ring.