JPS63160046A - Cassette loading mechanism for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve the reliability of operation by selecting two kinds of intermittent drive systems deciding the moving quantity of a cassette in response to the size of an opening provided to a cassette. CONSTITUTION:In loading a recording cassette 6 for recording onto a sub base 2 for a short time, a cassette 6 is positioned to cassette positioning holes 24, 25 by a tape suspension position as a standard cassette 22 and the loading state is sensed by a cassette loading sensing switch (not shown tri figure). A torque of a loading motor 33 is transmitted to a mode gear 35 on a main base via a transmission mechanism, the mode gear 35 is driven clockwise and the sub base 2 is moved in the direction of the arrow A, the loading is finished and the tape 3 is wound on a reel 5. On the other hand, in loading the standard cassette 22 to the sub base 2, the sub base 2 is moved toward the arrow A, the standard cassette loading is identified by the cassette type identification mechanism, the front part 40 of the standard cassette 22 of the sub base 2 is moved up to a position not interferred with a cylinder 15 and then the cas sette 22 is loaded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to a cassette mounting method for a magnetic recording/reproducing device, which allows cassettes of the same type and different types having the same external shape and reel spacing but different reel diameters to be selectively mounted. Regarding the mechanism.

[Conventional technology]

Magnetic recording and reproducing devices (hereinafter referred to as VTRs) are roughly divided into two types: stationary type and camera-integrated type. A known VTR uses a small cassette for short-time recording and playback. Since the large cassette and the small cassette differ in external dimensions and reel spacing, the same VTR can record and reproduce only either the large cassette or the small cassette.

For this reason, in order to record and reproduce a small cassette for a camera-integrated type on a VTR for a large cassette, a dedicated adapter is required, which poses a problem of inconvenience in handling.

Therefore, a VTR was proposed that made it possible to use both a cassette for long-time recording and playback and a cassette for short-time recording and playback without using such an adapter.
It is disclosed in Japanese Patent No. 1684.

The VTR seen in this earlier application has the same external dimensions and reel spacing, but a cassette for long-time recording and playback with a large reel diameter and a small opening on the bottom, and a cassette with a small reel diameter and a correspondingly small opening on the bottom. It uses an enlarged short-time recording/playback cassette, and by using these two-way sets properly, VTR compatibility is ensured and an adapter can be omitted. When using a cassette for long-term recording and playback, there is no overlap between the cassette and the cylinder, and the conventional V
Although it requires the same size of mechanism as TR,
When using a cassette for short-term recording and playback, by positioning the cylinder within the large opening of the cassette, the V
The size of the TR mechanism can be significantly reduced.

[Problem that the invention seeks to solve]

However, in the above-mentioned prior application, when changing the relative position between the cassette and the cylinder depending on the installed cassette, the shape of the installed cassette is detected with a micro switch, etc., and power is transmitted based on this detection signal. Since the system is switched to move the board on which the cassette is mounted by a predetermined amount, various electrical parts such as switches, solenoids, and connection leads are required, which can lead to poor connections, increased costs, or an increase in the size of the entire device. There was a risk that such problems would occur.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a cassette mounting mechanism for a magnetic recording/reproducing apparatus which solves the above-mentioned problems of the prior art, has high operational reliability, is inexpensive, and is suitable for reduction in size and weight.

[Means for solving problems]

An object of the present invention described above is to select one of two different intermittent drives using a switching member as a drive means for moving a moving table for loading a cassette to a first or second position.
This is generally achieved by using a system configuration and directly operating the switching member with a cassette detection member that is selectively driven depending on the size of the opening at the bottom of the dual force set.

[Effect]

With the above configuration, when a cassette for short-term recording and playback is installed, the cassette detection member is located in the large opening on the bottom of the cassette and is not operated, and the movable base on which the cassette is mounted is intermittently Via the drive system, the cylinder is moved to a position where it enters the large opening, and the mechanism is significantly retracted. Furthermore, when a cassette for long-term recording and playback is installed, the cassette detection member is driven to come into contact with the bottom surface of the cassette, and the transmission switching member is operated in conjunction with this. Therefore, the driving force is transmitted to the movable table via an intermittent drive system different from the one described above, and the movable table is moved to a position where the cassette and the cylinder do not overlap.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a perspective view of the standard cassette 22 for long-term recording used in this embodiment, viewed from the back.
4 and 5 are reels, wings are front lids, u, 25 are cassette positioning holes, 26 are reel lock release holes, n is grooves to prevent cassette incorrect insertion, rows are lid lock release bosses, 29.30
47 is a notch, and 47 is a hole for detecting the end of the tape.

Further, FIG. 3 is a perspective view of the short-time recording cassette 6 similarly used in this embodiment, seen from the back side. This short-time recording cassette 6 has the above-mentioned standard cassette 22, outer frame dimensions, distance between reels 4 and 5, and reel lock release hole 26.
Position, groove 27 for preventing incorrect cassette insertion, tape tension position fl
All the parts necessary for recording and reproducing in conventional VTRs, such as e (described later), are the same, ensuring compatibility. The differences in the two-way set 6.22 are the diameter of the built-in reel hub (not shown), the notches 29, 3
0 and 31h32, and the tape end detection hole 47, the reel hub diameter of the short-time recording cassette 6 is smaller and the notches 31 and 32 are set larger.

Next, the mounting operation of the double force sets 6 and 22 will be explained using FIGS. 1, 4, 5, and 6.

First, the general structure of the VTR will be explained with reference to FIG. 4. A sub-board 2 is placed on a main board 1 so as to be relatively movable in the direction indicated by the arrow. A mechanism for moving the sub-board 2 will be described later, but the sub-board 2 is provided with a reel stand (not shown) for driving the reel 4.5 of the dual force set 6.22. On the other hand, the main board 1 is provided with a cylinder 15 containing a magnetic head (not shown) and various tape guide means.

As shown in FIG. 4, when the short-time recording cassette 6 is attached to the sub-board 2, the cassette 6 is attached to the standard cassette 22.
Cassette positioning holes 24, 2 at the same tape stretching position as
5, and its installed state is detected by a cassette insertion detection switch (not shown). When the loaded cassette shape (short-time recording cassette) is identified by the cassette shape recognition mechanism described later, the rotational force of the loading motor north is transmitted to the mode gear on the main board 1 via a transmission mechanism (not shown). 35, and the mode gear 35 rotates clockwise in the figure.

When the mode gear 35 rotates clockwise, the mode gear 3
The switching gear 36 meshing with the switching gear 36 and the arm 37 attached to the switching gear 36 rotate counterclockwise.
Due to the rotation of 7, the pin 39 implanted in the arm 37 moves while being engaged with the long hole drilled in the sub-board 2.
The sub-board 2 moves in the direction indicated by the arrow in the figure. At the same time, the guide 7, tension pin 9, guides 12-14, 16-
17 and the pinch roller concave are moved in the direction of the arrow shown by the magnetic line in the figure through a guide mechanism (not shown) driven by the rotational force of the loading motor, and the cassette loading is completed as shown in FIG. Become.

When the cassette has been installed, the tape 3 stored in the short-time recording cassette 6 is moved to the guide 7° 8, the tension pin 9, the guide 10, the full-width erasing head 11, and the guide 1.
2 to 14, a cylinder 15, guides 16 to 18, an audio/control head 19, a pinch roller 20°, and a capstan 21 are attached, and the film is wound onto a reel 5 rotated by a reel motor 34. At this time, the cylinder 15 is planarly enclosed in the notch 31 of the short-time recording cassette 6, and in this state, the mechanism size of the VTR is approximately the size of the cassette.

5 and 6 are plan views when the standard cassette 22 is installed in the VTR. FIG. 5 shows the cassette installed state, and FIG. 6 shows the cassette installed state. In this case, when the standard cassette 22 is attached to the sub-board 2, the sub-board 2 moves in the direction indicated by the arrow in FIG. Since the identification mechanism identifies the m'l11 cassette shape, the movement of the cassette 6 is reduced compared to the case of the short-time recording cassette 6. When the cassette installation is completed, as shown in FIG.
is moved to a position where it does not interfere with the cylinder 15, and the sub-board 2 and the rear part 41 of the standard cassette 22 protrude from the main board 1.

As is clear from the above description, the VTR according to this embodiment
Now, it is necessary to transport two different cassettes 6 and 22 to different loading positions, and the mechanism will be explained below.

FIG. 7 is a side sectional view showing a part of the cassette shape identification mechanism described above. As shown in the figure, the other end of a lock arm having a boss 55 at one end is rotatably supported on a boss 51 provided upright on the main board 1 via a pin 52. 53 is biased clockwise in the figure by a spring (not shown). On the other hand, the other end of a detection arm (equipment) having a roller 54 pivotally supported at one end is rotatably supported on the sub-board 2 via a pin 49, and this detection arm 50 is also clockwise supported by a spring (not shown). It is biased in the rotational direction.

FIGS. 8(a) and 8(bl) are side views showing a part of the sub-board drive transmission mechanism. As shown in the figure, shafts 57 and 59 are planted on the main board 1 at a predetermined interval. The aforementioned switching gear 36 is supported on the shaft 57, and the mode gear 35 is supported on the shaft 59.Details of the switching gear 36 after these mode gears will be described later, but the switching gear 36 is wound around the shaft 57. The upper arm 37 is in contact with the boss 55 explained using FIG. 7. On the other hand, the mode gear 35 is supported by the shaft 59 without moving in the thrust direction. and is constantly meshed with the gear μs rotated by the rotational force of the loading motor.

FIG. 9 is an exploded perspective view of the mode gear 35.

As shown in the figure, the mode gear 35 includes gears 42 and 44 having notches 42a and 44a, respectively, and a two-stage slide portion 4 held between these gears 42 and 44.
It consists of a cam guide having a and 43b, and a gear mark that meshes with the gear group, and these are connected by a key 46 so that they rotate together.

FIG. 10 is an exploded perspective view of the switching gear 36.

As shown in the figure, the switching gear 36 consists of a pair of gears 45° and 47, and a cam 46 sandwiched between them and having a notch of 46 m, and these and the arm are connected by a key so that they are integrated. It is designed to rotate.

In the mechanism configured as described above, when the standard cassette 22 is inserted onto the sub-board 2 from the direction of arrow B in FIG.
The lock arm is pressed by the bottom surface of the lock arm and rotates counterclockwise, and the lock arm is pressed by the colonnium at the tip of the lock arm and rotates counterclockwise about the pin 52. Then, Figure 8 (a
), the arm 37 is pressed by the boss 55 of the lock arm 53 and moves downward against the arm 37 and the switching gear spring. As a result, the gear 44 on the mode gear 35 side and the slide portion 43b of the cam gear are in a Geneva-driven relationship with the gear 47 and cam 46 on the switching cam 36 side, respectively, and the gear 42 on the mode gear 35 side and the gear 45 on the switching cam concave side are connected to each other. do not mesh. In such a state, the standard cassette 22
is placed on the sub-board 2, that is, the rollers 54
is maintained during sliding contact on the lock arm 8.

When the loading motor is driven and the rotating force is transmitted to the mode gear via the gear plate and the gear mark, this rotating force is transferred to the notch 44a of the gear material and the gear 47.
When the gear 47 idles in opposition to the gear 47, the transmission is not transmitted to the switching gear 36 side, and when the gear material meshes with the gear 47, the switching gear 36
The arm 37 rotates by a predetermined angle. In addition,
In this case, since the angular range of the notch 44m of the gear material is relatively large, the amount of rotation of the arm 37 is small, and therefore the amount of movement of the sub-board 2 driven by the arm 37 is also small.
The sub-board 2 moves to the position shown in FIG.

On the other hand, when the short-time recording cassette 6 is inserted into the sub-board 2, the detection arm (equipment) is located within the notch 31 of the short-time recording cassette 6, so the detection arm (equipment) and lock The arm 53 does not operate as described above, and the positional relationship between the mode gear and the switching gear 36 is maintained as shown in FIG. 8(b).

That is, since the switching gear field in this case is urged upward by the spring 56, the gear 42 on the mode gear 35 side and the cam slide portion 43a are in a Geneva-driven relationship with the gear 45 and cam 46 on the switching gear 36 side, respectively. , mode gear 3
Gear I on the 5 side and gear 47 on the switching gear 36 side do not mesh. Therefore, the rotational force of the mode gear rotated by the driving force of the loading motor blade is not transmitted to the switching gear 36 side when the notch 42a of the gear 42 faces the gear 45 and the gear 45 idles. When the gear 42 meshes with the gear 45, the signal is transmitted to the switching gear 36, and the arm 5 rotates by a predetermined angle. In this case, the notch 42 a of the gear 42
Since the angular range of is set smaller than that of the notch 44a of the gear I mentioned above, the amount of movement of the sub-board 2 due to arm correction is larger than that of the standard cassette 6, and the sub-board 2 is shown in FIG. Move to the indicated position.

In this way, in the above-mentioned embodiment, since the two-stage Geneva drive is interposed in a part of the power transmission line that drives the sub-board 2, the movement of the sub-board 2 can be easily controlled by the attached cassette shape. It can be set in two ways depending on the

[Effects of the Invention] As explained above, according to the present invention, two types of intermittent drive systems that determine the amount of movement of the cassette can be selected depending on the size of the opening provided in the cassette. Therefore, it is possible to provide a cassette mounting mechanism for a magnetic recording/reproducing device that has high operational reliability, is inexpensive, and is suitable for being compact and lightweight.

[Brief explanation of the drawing]

The figures are all for explaining one embodiment of the present invention, and Figure 1 is a plan view of the magnetic recording and reproducing apparatus showing the state in which a short-time recording cassette has been installed, and Figure 2 is a standard cassette viewed from the back side. 3 is a perspective view of the short-time recording cassette seen from the back side; FIG. 4 is a plan view of the magnetic recording/reproducing device showing the loading state of the short-term recording cassette; and FIG. 5 is the loading of a standard cassette. FIG. 6 is a plan view showing the state of the magnetic recording and reproducing apparatus in which the installation is completed in FIG.
1(b) is a side view showing a part of the sub-board drive transmission mechanism, FIG. 9 is an exploded perspective view of the mode gear, and FIG. 10 is an exploded perspective view of the switching gear. 1... Main board 2... Sub board (moving table) 3... Tape 4, 5... Reel 6.
...Cassette 15 for short-time recording...Cylinder n...Standard cassette u
, 25...Cassette positioning hole garden, 31...Notch (opening)...Loading motor...Mode gear 36 gear switching gear 37...
Arm long hole part 42 , 44 , 45
, 47, 60... Gear 42 a, 44 m...
・Notch part invitation, 46...cam father...detection arm
Crime... Lock arm 41 Figure 1: Main board 15.
゛ The Dekihan, 51. ? flK sound p5°te - ? 55. Hair-F: Blue 4
5, reel J6/t7 contact key G, short a4 interlude Otsusho east use sword) -57° A closed 2 figure Sanskrit 3 figure 44 figure party 5 figure 5P16 figure 50: f7J missing 5 sound P porridge figure 7 Straw 6 (b)

Claims (1)

[Claims] 1. A first cassette containing a pair of large reels and having a small opening facing the front at the bottom; a first cassette having the same external dimensions and the same distance between the reels as the first cassette; containing a pair of small reels; A magnetic recording and reproducing device capable of selectively mounting a second cassette having a large opening on the bottom, comprising: a movable stand mounted with a reel stand for driving both the large and small reels; and a drive source. a driving means capable of transmitting force to the movable table through either one of two different intermittent drives; A cassette mounting mechanism for a magnetic recording and reproducing apparatus, comprising: a cassette detecting member driven by the bottom surface of one cassette; and a transmission switching member driven by the cassette detecting member and selecting between the two intermittent drives.