JPS63193367A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify a structure by performing a tape loading by controlling the work of a loading mechanism by a cassette holding member. CONSTITUTION:A mode gear 21 is descended together with a cassette being inserted to a cassette holder and when it is loaded on a cassette holding member 22, it is driven with rotation from the loading start position shown by a broken line to the loading completion position shown by a continuous line in a counterclockwise direction with a driving source being driven. The mode gear 21 is then slid by a distance L by energizing a cam groove 23 of the cassette holding member 22 by moving it in an arrow mark E direction by a driving part 21a to move the cassette to a driving position. The cassette holding member 22 simultaneously moves an S and T slider posts 28, 29 by actuating linking mechanisms 26, 27 by extensively provided parts 22a, 22b, mounting a cylinder by pulling the tape of the cassette out to complete the tape loading. The structure can thus be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a magnetic recording/reproducing device such as a video tape recorder (VTR).

(Prior Art) As is well known, in this type of magnetic recording/reproducing device,
A loading mechanism that pulls out a tape wound around a cassette and loads the tape, and a mode switching mechanism that switches modes of the drive mechanism are provided.

FIG. 3 shows a conventional magnetic recording/reproducing device, in which a mode gear 2 having, for example, a three-stage structure and driven and controlled by a drive source (not shown) is rotatably disposed in a main chassis 1. A mode switching cam 2a is formed on the mode gear 2, and a main slider 3 connected to a mode switching mechanism (not shown) is engaged with the mode switching cam 2a. The main slider 3 moves in response to the rotation of the mode gear 2 and selectively moves in the directions of arrows A and B.
and controls the mode switching mechanism. Also,
A timing gear 4 having a toothless structure is meshed with the mode gear 2 to perform an intermittent transmission operation called a Geneva operation. The timing gear 4 is meshed with an S loading gear 5 and a T loading gear 6 in this order. Of these, the S loading gear 5 has an S loading ring 7.
are meshed with each other, and a T loading ring 8 is meshed with the other T loading gear 6. In addition, a loading control gear 9 is attached to the T loading ring 8, and a relay gear 10°1 is connected to the loading control gear 9.
1. This loading #J'm gear 9 is formed with an engagement pin 9a. This engagement bin 9a is a cassette holding member 1 that holds a cassette (not shown).
The cassette holding member 12 is engaged with the driven cam groove 12a formed in the cam groove 12a, and is moved by the rotation thereof to control the movement of the cassette holding member 12 in the directions of arrows C and D. Further, a slider post 13 (only one on the S loading ring 7 side is shown in the figure) is mounted on each of the S and T loading rings 7° 8, and the slider post 13 (only one on the S loading ring 7 side is shown) is moved by the rotation of the slider post 13, and the tape is wound around the cassette. is pulled out and mounted on a cylinder (not shown).

That is, the mode gear 2 is rotated by the drive source when the cassette is attached to a cassette holder (not shown), lowered together with the cassette holder, and attached to the cassette holding member 12. Then, the mode gear 2 rotates the S and T loading rings 7.8 clockwise and counterclockwise in the figure, respectively, via the timing gear 4 and the S and T loading gears 5 and 6, thereby rotating the slider post 13.
Pull out the tape from the cassette. At the same time, the T loading ring 8 rotationally drives the loading control gear 9 via the relay gear 10.11 to control the movement of the cassette holding member 12 in the direction of arrow C, thereby loading the tape of the cassette onto the cylinder. Loading is complete. here,
The mode gear 2 is separated from the timing gear 4 to be in a non-transmission state, and the cassette holding member 12 is regulated at the loading end position. On the other hand, as the mode gear 2 rotates, the mode switching cam 2a controls the movement of the main slider 3 in the directions of arrows A and B to drive and control the mode switching mechanism, thereby controlling the drive mechanism section to a predetermined mode. do.

Also, in the unloading operation from the loading end position, the mode gear 2 is first reversed, and the timing mR14, the S and T loading gears 5, 6, the S and T loading rings 7.8, the relay gear 10.11, and the loading The control gear 9 is reversed and the cassette holding member 1
2 is returned to the original loading start position in the direction of the arrow. Here, the mode gear 2 is again separated from the timing gear 4 and controlled to a non-transmitting state, and its rotation moves the main slider 3 to drive and control the mode switching mechanism, thereby changing the mode of the drive mechanism section. Control.

However, due to the structure of the above-mentioned magnetic recording/reproducing device,
S and T loading ring 7 dedicated to loading mechanism
．． Since a large number of components including 8 are required, the structure is very complicated, and it has been difficult to achieve the thinness that is required in recent years.

(Problems to be Solved by the Invention) This invention was made in view of the above-mentioned request for thinning, and it is possible to simplify the structure and improve the thinning as much as possible. The purpose of the present invention is to provide a magnetic recording/reproducing device.

[Structure of the Invention] (Means for Solving the Problems) The present invention includes a mode gear having a drive section, and a mode gear that is engaged with the drive section of the mode gear and moves as the mode gear rotates to hold a cassette. a cassette holding member that is guided and controlled to a first position for starting loading and a second position for ending loading; and a loading mechanism that moves on the cassette holding member to pull out and load the tape wound on the cassette. and a mode switching mechanism that is controlled to be switched by a driving section of the mode gear at the first and second positions of the cassette holding member.

(Function) With the above configuration, the loading mechanism is operated and controlled by the cassette holding member to perform tape loading, thereby simplifying the configuration.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a magnetic recording/reproducing apparatus according to an embodiment of the present invention, in which a mode gear 21 is rotatably disposed on a main chassis 2o and is driven and controlled by a drive source (not shown). This mode gear 21 is formed with a drive al 121a for loading and mode switching drive. This drive aB21a is inserted into the driven cam groove 23 of the cassette holding member 22. This cassette holding member 22 is disposed so as to be movable in the directions of arrows E and F, and the cam groove 23 is provided with, for example, the mode gear 21 as shown in FIG.
A circular arc portion 23a corresponding to the rotation radius R of the drive portion 21a is formed in a substantially Y-shape.

Further, on the cassette holding member 21, there are arrows G, H, and a main slider 24 for driving and controlling a mode switching mechanism (not shown).
It is arranged so that it can move freely in the direction.

This main slider 24 is connected to the arrow H via a spring member 25.
A biasing force is applied in the direction, and one end thereof is provided opposite to the driving portion 21a of the mode gear 21.

Further, first and second extending portions 22a and 22b are formed at a predetermined interval at the distal end of the cassette holding member 22, and the first and second extending portions 22a and 22b are One ends of the first and second link mechanisms 26 and 27, which constitute a so-called toggle link, are linked together.

S and T slider posts 28,29 are supported at the other ends of the first and second link mechanisms 26,27, respectively. The S and T slide posts 28 and 29 have engaging portions 28a and 29a formed at their bases, and these engaging portions 28a and 29a are formed at their bases.
, 29a are inserted into the S and T guide grooves 30, 31 for positioning so as to be freely guided.

The S and T guide grooves 30 and 31 correspond to recesses in a cylinder and a cassette (not shown), for example, in the main chassis 20.
is formed.

In the above configuration, when the mode gear 21 is inserted into a cassette holder (not shown), the cassette is lowered together with the cassette holder, and when the mode gear 21 is attached to the cassette holding member 22, the drive source is driven and the mode gear 21 is first driven by the broken line in FIG. It is rotationally driven in a counterclockwise direction from the loading start position shown by to the loading end position shown by the solid line in the figure. When T is reached, the mode gear 21 moves and biases the cam groove 23 of the cassette holding member 22 in the direction of the arrow E with its driving portion 21a, and slides by a distance, thereby moving the cassette to the drive position. At the same time, the cassette holding member 22 connects the first and second link mechanisms 26, 27 with its first and second extensions 22a, 22b.
is operated to move the S and T slider posts 28 and 29, the tape from the cassette is pulled out and loaded onto the cylinder, and tape loading is completed. Here, the driving portion 21a of the mode gear 21 is guided to one side of the circular arc portion 23a of the cam groove 23, and the main slider 24
The main slider 24 is moved clockwise and counterclockwise in the figure to move and control the main slider 24 in the directions of arrows G and H, thereby controlling the mode switching mechanism. At this time, since the driving portion 21a of the mode gear 21 is located in the arcuate portion 23a of the cam groove 23, the cassette holding member 22 is not urged to move as the mode gear 21 rotates, and the cassette holding member 22 is not moved to the 0-ding completion position. (Loading completion position) is held.

Further, when the mode gear 21 is reversed at the loading end position, the cassette holding member 22 is urged to move in the direction of the arrow F by the driving portion 21a, and is moved by a distance shown by the broken line in FIG. Returns to the starting position. At the same time, the cassette holding member 22 returns the first and second link mechanisms 26, 27 to their original positions,
Perform unloading. Here, the driving part 21a of the mode gear 21 is located on the other side of the circular arc part 23a of the cam groove 23 of the cassette holding member 22, and is again opposed to one end of the main slider 24, and rotates in the clockwise and counterclockwise directions in the figure. The main slider 24 is controlled to move in the directions of arrows G and H, thereby controlling the mode switching mechanism. At this time, since the drive portion 21a of the mode gear 21 is located in the arcuate portion 23a of the cam groove 23, the cassette holding member 22 is not biased to move as the mode gear 21 rotates, and maintains the loading start position. do.

As described above, the above magnetic recording/reproducing apparatus is constructed so that tape loading is performed by controlling the operation of the S and T slide posts 28 and 29 using the cassette holding member 22 which is directly driven by the mode gear 21. Since the gear transmission mechanism and the S and T loading rings 7.8 are not required, the configuration can be simplified and the thickness can be improved as much as possible.

Note that this invention is not limited to the above embodiments, but also includes
It goes without saying that various modifications can be made without departing from the spirit of the invention.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to provide a magnetic recording and reproducing device that has a simplified configuration and can be made as thin as possible. .

[Brief explanation of the drawing]

FIG. 1 is a configuration explanatory diagram showing a magnetic recording/reproducing device according to an embodiment of the present invention, FIG. 2 is a diagram shown to explain the operation of FIG. 1, and FIG. 3 is a conventional magnetic recording/reproducing device. FIG. 20... Main chassis, 21... Mode gear, 2
1a... Drive unit, 22... Cassette holding member, 22
a, 22b...first and second extension parts, 23...cam groove, 24...main slider, 25...spring member, 26.27...first and second links Mechanism, 28° 29...S and T slider post, 28a, 29a.
...Engagement part, 30.31...S and T guide grooves.

Claims (1)

[Claims] a mode gear having a drive part; and a mode gear that is engaged with the drive part of the mode gear and moves as the mode gear rotates to hold the cassette in a first position for starting loading and a second position for ending loading. a cassette holding member that is guided and controlled; a loading mechanism that moves on the cassette holding member to pull out and load the tape wound on the cassette; and a mode gear in the first and second positions of the cassette holding member. 1. A magnetic recording/reproducing device comprising: a mode switching mechanism whose switching is controlled by driving the magnetic recording/reproducing device.