JPS6053378B2 - magnetic recording and reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing apparatus that automatically mounts a magnetic tape on a magnetic tape guide incorporating a rotating magnetic head and records or reproduces signals on the magnetic tape. be.

In conventional rotary head type magnetic recording and reproducing devices, a magnetic tape drawer is used to pull out a magnetic tape from a cassette and automatically align the magnetic tape with a magnetic tape guide, as shown in Japanese Patent Application Laid-Open No. 52-1344M. Double pivot rings are often used as means for driving the guide means.

Further, in order to regulate the locus of the magnetic tape draw-out operation of the magnetic tape draw-out guide means, a guide plate is provided with a guide groove into which the magnetic tape draw-out guide means fits and slides. Furthermore, a mechanism is provided for positioning the magnetic tape drawer guide means at a position where the magnetic tape drawer guide means pulls out the magnetic tape from the cassette and moves to a position where the magnetic tape is placed on the magnetic tape guide.
This positioning mechanism uses a V-shaped groove to hold down the upper part of the guide roller shaft of the magnetic tape drawer guide means for forward positioning of the magnetic tape drawer guide means, and uses a V-shaped groove to hold down the lower part of the guide roller shaft as a lateral positioning means. U
In addition, as a positioning means in the vertical direction, a stopper which is provided in the magnetic tape drawer guide means and comes into contact with the upper surface of a tongue-shaped member extending forward thereof is used.
The positioning mechanism of this type of magnetic tape drawer guide means is generally composed of two parts.

This poses a problem in terms of cost reduction. Further, the bases of the pair of magnetic tape drawer guide means have separate left and right shapes. Therefore, there is no mutual compatibility, and this also poses problems in terms of mass production and cost reduction.
The present invention provides a magnetic recording and reproducing apparatus that has high reliability in magnetic tape mounting operation, has a simple structure, and has reliable positioning of the magnetic tape drawer guide means at the position where the magnetic tape is attached to the magnetic tape guide. is intended to provide.

The present invention is characterized by: a cylindrical magnetic tape guide having a rotating magnetic head mounted on a substrate; a magnetic tape drawer guide means having a moving body movable between the first position and the second position of the tape cassette loading position, and a tape pull-out roller embedded in the moving body; a driving means that engages with a protrusion provided below the movable body of the guide means and drives the magnetic tape drawer guide means from the second position to the first position; First and second portions that respectively engage the upper and lower parts of the shaft of the tape drawer roller in the tape drawer guide means, guide its movement, and restrain its left and right movement.
engaging the stopper 3 means at the first position with a protrusion provided on the movable body of the magnetic tape drawer guide means;
It is provided with a third stopper that simultaneously regulates the moving direction position and the vertical position of the movable body, which simplifies the structure and ensures reliable tape mounting operation. 4 Below, embodiments of the present invention will be described with reference to the drawings. In Figures 1 to 4,
The magnetic tape running section of the magnetic recording/reproducing apparatus of the present invention will be explained. In the figure, 1 is a magnetic tape guide, and this magnetic tape guide 1 has two rotating magnetic heads (not shown).
are mounted facing each other with 180 phases.
This rotating magnetic head and the magnetic tape guide 1 constitute a rotating magnetic head device. Reference numeral 2 denotes a cassette, and the cassette 2 is equipped with a magnetic tape feed reel and a take-up reel (both not shown), and the magnetic tape 3 is wound around these reels.

4,4'' pull out the magnetic tape 3 from the cassette 2,
As shown in FIG. 3, this is a magnetic tape drawer guide means for following the Y magnetic tape guide 1.

The magnetic tape drawer guide means 4, 4'' are tape drawer rollers 4a, 4a'' and inclined posts 4b, 4b'', respectively.
and moving bodies 4c, 4C'' that hold the same.
When the cassette is loaded, the magnetic tape/drawer guide means 4, 4'' are located inside the cassette 2 (in the notch) as shown in FIG. ), the magnetic tape 3 is pulled out from the cassette 2 by moving on the guide plate 5 in the direction of the arrow along the guide grooves 6, 6'' of the guide plate 5, respectively. Then, the magnetic tape drawer guide means 4, 4'' move until they come into contact with the stoppers 7, 7'', respectively, as shown in FIG. 3, and then stop. As a result, the magnetic tape 3 can be placed along the magnetic tape guide 1 as shown in FIG. The driving means for moving the magnetic tape drawer guide means 4, 4'' as described above will be explained with reference to FIGS. 5 and 6.

Before describing in detail the driving means of the magnetic tape drawer guide means 4, 4'', using FIG. I will briefly explain about.

Movable bodies 4c, 4C of magnetic tape drawer guide means 4, 4''
As shown in FIG. 2, " is a protrusion 4d, 4d" on the second position side that protrudes downward and a protrusion 4e on the first position side.
, 4e''.These protrusions 4d, 4d'', 4
e and 4e'' are slidably fitted into guide grooves 6 and 6'' of the guide plate 5, respectively. The guide plate 5 is attached to the substrate 8 via a spacer. This guide plate 5 and board 8
A magnetic tape drawer guide means 4, which will be described below, is provided between the
4'' drive means is arranged.The mechanism of this drive means will be described mainly with reference to FIG.

FIG. 5 shows a chassis 1 on which a magnetic tape guide 1 is placed.
Only a is shown.

A worm 9 is disposed near the center of the magnetic tape guide 1 on the side opposite to the magnetic tape, that is, at the rear, so as to face the front of the magnetic tape guide 1 . This worm 9 is rotatably attached to the base plate 8 by a bearing 10. A pulley 1 is connected to the shaft of the worm 9 via a belt 11 to a motor (not shown).
2 is installed. Worm gears 13, 13'' are engaged with the worm 9. These worm gears 13, 13'' are arranged on the left and right sides with respect to the worm axis at the rear position of the magnetic tape guide 1, as shown in FIG. It is supported by the guide plate 5 and the base plate 8 as shown in FIG. Each worm gear 13, 13'' has a long hole 14, 14'', a spring guide groove 1
5,15'' and spring locking pins 16,16''. The worm gears 13, 13'' are made of a lightweight material such as plastic.
In this example, the chain members 17, 17'' connected to 13'' are connected to three link members 20-22, 2''-2'', which are each pivotally connected by two pins 18, 19, 18'', 19''.
It is composed of 2".

The ends of the link members 22, 22'' on the magnetic tape side of the chain members 17, 17'' are connected to the magnetic tape drawer guide means 4 by means of pins 23, 23'' provided therein, as shown in FIG. , 4''.The ends of the link members 20, 2'' on the worm gear side of the chain members 17, 17'' are provided at this,
The worm gears 13, 1
3". The pins 24, 24" and the spring locking pins 16, 16" on the worm gears 13, 13" each have a spring 25,
25'' is arranged. These springs 25, 25'' are for absorbing overstroke due to overrunning of the motor when the magnetic tape is drawn out by the magnetic tape drawer guide means 4, 4''. Spring 2
5, 25'', pins 24, 24'' are inserted into the long holes 14 when installed.
, 14'' is applied with an initial tensile force so as to come into contact with one end of the chain members 17, 17''. Guide members 26, 26'' are provided. These guide members 26, 26'' respectively pass on the sides of the magnetic tape guide 1, and the worm gears 13,
13", and the worm gear 13
, 13'', respectively, the worm gear 13
, 13'' is formed in an arc shape having a center substantially the same as the center of the guide members 26, 26''.
On the other hand, it is molded using a plastic outsert mold, for example, and is very easy and inexpensive to manufacture. In this way, the guide members 26, 26''
By configuring the worm gears 13 and 13'' portions in an arc shape, the chain member 1
Link members 20, 21, 20″ that constitute 7, 17″,
2" can be rolled up and guided as shown in FIG.

Next, the tape mounting operation by the above-mentioned driving means will be explained.

Now, as shown in FIG. 1, the magnetic tape drawer guide means 4,
The cassette 2 is loaded with the magnetic tape guides 4'' located at the front positions of the magnetic tape guide 1.

Next, when the operator presses a recording or playback button (not shown), the worm 9 rotates in the direction of the arrow via the motor, belt 11 and pulley 12 as shown in FIG. The worm gear 13'' rotates clockwise and the worm gear 13'' counterclockwise. Therefore, the chain member 17
, 17'' are moved toward the magnetic tape guide 1 via springs 2J5, 25'' and pins 24, 2C. At this time, the pins 18, 19, 23 and 1 of the chain members 17, 17''
, 19'', 23'' are fitted into the guide members 26, 26'', respectively, so the chain member 17, 1-7'' is smoothly guided by the guide members 26, 26''. The drawer guide means 4, 4'' are connected to the chain member 1.
7 and 17'' respectively on the guide plate 5 along the guide grooves 6 and 6'' of the guide plate 5, and pull out the magnetic tape 3 from the inside of the cassette 2. After that, the chain members 17, 17
'', the magnetic tape drawer guide means 4,
4" are the respective stoppers 7 and 7" as shown in Figure 3.
When it comes into contact with the object, it moves and stops. This state is detected by, for example, a microswitch, and the current to the motor is cut off, but the details are not directly related to the present invention and will not be explained here. At this time, the link members 20, 21, 2'', 2'' of the chain members 17, 17'' are guided by the guide members 26, 26'' as shown in FIG.
, 13''. Due to the above operation,
The magnetic tape 3 is automatically mounted around the magnetic tape guide 1 over a distance of at least 180, as shown in FIGS. 3 and 4. Next, the structure of the magnetic tape drawer guide member and stopper described above will be explained.

First, the magnetic tape drawer guide member will be explained with reference to FIGS. 7 to 10. FIG. 7 is a plan view of the state in which the magnetic tape drawer guide member 4 is engaged with the guide groove 6 of the guide plate 5 and is moving from the bottom of the cassette 2 to the right side of the magnetic tape guide or in the opposite direction. It shows.

Note that the other magnetic tape drawer guide means 4'' etc. are symmetrical to this, so their explanation will be omitted hereafter.As mentioned above, the magnetic tape drawer guide member 4 consists of the tape drawer roller 4a and the inclined post. 4b, but in this example, the inclined post 4b is a separate part from the moving body 4c of the magnetic tape drawer guide means 4.
It is planted in 7. This inclined post installation plate 27 is connected to the movable body 4c of the magnetic tape drawer guide means 4 by screws 28.
is integrated into. FIG. 8 is a side view of the magnetic tape pull-out guide member 4, and in this figure, the tape pull-out roller 4a is screwed onto a shaft 29 implanted in the movable body 4c. standing upright.

The inclined post planting plate 27 is also provided with a hole 30 through which the shaft 29 passes. The shaft 29 and the inclined post installation plate 27 are pivotally connected, and when the screw 28 is loosened, the position of the inclined post 4b can be slightly moved around the shaft 29! has been done. FIG. 9 is a rear view of the magnetic tape drawer guide means 4, and in this figure, the above-mentioned protrusion 4d
is shown engaged with the guide groove 6 of the guide plate 5.

Reference numeral 31 denotes an H-shaped leaf spring. This leaf spring 31 is attached to the movable body 4c with screws 32, and the guide plate 5 is sandwiched between the lower surface of the movable body 4c and the H-shaped spring 31. There is.

FIG. 10 is a bottom view of the magnetic tape drawer guide member 4, showing how the guide groove 6 of the guide plate 5 and the protrusions 4d, 4e of the magnetic tape drawer guide means 4 are engaged.

Both of the protrusions 4d and 4e have a cylindrical shape, and their outer diameter is approximately equal to the width of the guide groove 6. Since these two protrusions 4d and 4e are both cylindrical, even if the guide groove 6 has a certain curvature, the movable body 4c of the magnetic tape drawer guide means 4 can smoothly move along the guide groove 6. Can be moved. Not only that, but also 1 protrusion 4d, 4e
By making both of them cylindrical, the movable bodies 4c and 4C'' of the pair of magnetic tape drawer guide means 4 and 4'' can have a common shape, and the cost reduction effect due to mass production is significant. Next, the shape of the stopper 7 will be explained with reference to FIGS. 11 to 14. Since the shape of the stopper 7'' is similar to that of the stopper 7, the stopper 7 will be described below.This stopper 7 has U-shaped grooves 33 and 34 on the upper and lower sides, as is clear from FIGS. protrusion 35,
It is equipped with 36. These "projections 35, 36 are the first
and constitutes a second stopper means. Furthermore, the protrusion 3
A recess 39 having a horizontal surface 37 and an inclined surface 38 is provided at the intermediate portion between 5 and 36 . This recess 39 constitutes a third stopper means. A slight section slope 40 is provided at the end of the horizontal surface 37. This section slope 40 facilitates the engagement of the magnetic tape drawer guide means 4 with the movable body 4c. Reference numeral 41 denotes a collar whose lower surface is in contact with the upper surface of the guide plate 5.

42a and 42b are screw holes provided in the collar 41.

This stopper 7 is integrally molded. A movable body 4 of the magnetic tape drawer guide means 4 that engages with the stopper means.
7, 8, and 1 on the front side of the
As shown in FIG. 0, a protrusion 43 is provided. The upper surface of this protrusion 43 has a substantially horizontal surface 43a, and the lower part thereof has a spherical protrusion 43b. Next, the operation of abutting and engaging the magnetic tape drawer guide means 4 and the stopper 7 will be explained with reference to FIGS. 15 and 16.

FIG. 15 shows that the magnetic tape drawer guide means 4 is connected to the chain member 17.
It shows a state in which the magnetic tape 3 is approaching the stopper 7 while receiving the driving force F from the 16th
The figure shows a state in which the magnetic tape drawer guide means 4 is fully abutted and engaged with the stopper 7 and positioned.

That is, when the movable body 4c of the magnetic tape drawer guide means 4 approaches the stopper 7, the tape drawer roller 4a
The shaft 29 of is guided into the lower U-shaped groove 34. Then axis 2
9 fits into the U-shaped groove 33 at the top, and its position and inclination in the lateral direction with respect to the traveling direction is regulated.

Next, the upper surface 43a of the protrusion 43 of the movable body 4c sinks under the lower surface of the horizontal surface 37 of the recess 39 of the stopper 7, and the lower spherical surface 43b of the protrusion 43 of the movable body 4c sinks into the slope 38 of the recess 39 of the stopper 7. The magnetic tape drawer guiding means 4 is simultaneously regulated in its vertical and forward position and posture. Due to the configuration of the movable body 4c of the magnetic tape drawer guide means 4 and the stopper 7 described above, the front and rear, left and right, up and down positions and postures of the magnetic tape drawer guide means 4 are reliably regulated at the first position. Since no excessive external force is applied to the shaft 29 of the tape pull-out roller 4a, which is an important part of the magnetic recording/reproducing apparatus, deformation does not occur, and good running of the magnetic tape can be maintained.

As described in detail above, the present invention provides the following features:
By forming two cylindrical protrusions, the shape of the movable body of the pair of magnetic tape drawer guide means can be made common,
The cost reduction effect of mass production is significant.

Furthermore, the shape of the stopper 7 is simplified, and the positioning of the magnetic tape drawer guide member is made more secure. Furthermore, since no strong external force is applied to the shaft of the tape pull-out roller in the magnetic tape pull-out guide means 4, deformation does not occur, and good tape running can be maintained.

[Brief explanation of drawings]

FIG. 1 is a plan view of an example of the magnetic recording and reproducing apparatus of the present invention in a cassette loading position state, FIG. 2 is a view taken along the ■-■ arrow in FIG.
FIG. 3 is a plan view showing the state when the tape is loaded, FIG. 4 is a view taken along the ■-■ arrow in FIG. FIG. 6 is a plan view showing the state of the drive means at the tape loading position, FIG. 7 is a plan view of the magnetic tape drawer guide means of the present invention viewed from above, and FIG. 9 is an elevation view seen from the rear of FIG. 7, FIG. 10 is a plan view seen from below of FIG. 7, and FIG. 11 shows the stopper of the present invention. A plan view seen from above, Figure 12 is the 11th
Fig. 13 is a plan view seen from below in Fig. 12, Fig. 14 is a sectional view taken in the direction of the
This figure is a side view showing a state in which the magnetic tape drawer guide means is approaching the stopper, and FIG. 16 is a side view showing a state in which the magnetic tape drawer guide means and the stopper are in abutting engagement with each other. 1...Magnetic tape guide body, 3...Magnetic tape, 4,4''...Magnetic tape drawer guide means,
4a, 4a″...Tape pull-out roller, 4c,
4C''...Moving object, 4d, 4d'', 4e, 4e''
... Protrusion, 5 ... Guide plate, 6,6'' ...
・Guide groove, 7,7″... Stopper, 8...
Substrate, 17,17″... Chain member.

Claims (1)

[Scope of Claims] 1. Movement of a moving body of a magnetic tape drawer guide means guided by a guide plate is restrained on both sides of a cylindrical magnetic tape guide housing a rotating magnetic head mounted on a substrate. In a magnetic recording and reproducing apparatus equipped with a stopper means, the stopper means includes first and second stoppers that guide the movement of the upper and lower parts of the shaft of the tape pull-out roller provided on the movable body and restrain the left and right movement. and a horizontal surface located between the first stopper and the second stopper that engages with a protrusion provided on the movable body to simultaneously regulate the moving direction position and the vertical position of the movable body; A magnetic recording/reproducing device comprising: a third stopper having a recess formed by opposing slopes. 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the first stopper and the second stopper are provided with a U-shaped groove that contacts and engages the shaft of the tape pull-out roller. 3. The magnetic recording and reproducing apparatus according to claim 2, wherein the first, second and third stoppers are integrally formed and are attached to a guide plate.