JPH03104047A - Tape discriminator for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To discriminate the kinds of tapes in both cassettes by operating a detecting means to the compact cassette by an operating means according to the presence and absence of a tape kind discriminating hole, and saving the operating means to the standard cassette. CONSTITUTION:When the compact cassette is loaded on a tape driving means 13, a conversion lever 52 is once rotated in a 1b direction and an operation part 55 operates a detecting means 58. Afterwards, when a hole engaging part 54 is abutted to a tape kind discriminating hole 12a, the lever 52 is rotated in a 1a direction and the means 58 is turned OFF. When the standard cassette is loaded, an engaging rod 59 is moved to a position, where loading operation is not distrubed, and the lower end face of the cassette is abutted and slid to a bearing part 53 of the lever 52. Then, the means 58 is turned ON. On the other hand, when there is no discriminating hole, the tape is not pressed by the cassette and the means 58 is turned OFF. Thus, the kinds of the tapes in the compact and standard cassettes can be discriminated by one detecting means.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape discrimination device for a magnetic recording/reproducing device that can be applied to either a small tape cassette or a standard tape cassette.

BACKGROUND OF THE INVENTION In recent years, cassettes used in magnetic recording and reproducing devices such as video tape recorders (hereinafter abbreviated as VTR) include not only standard tape cassettes, but also small tape cassettes that are smaller than standard tape cassettes. Integrated VT
Widely used in the R market. By the way, conventionally, in order to record and play back this small tape cassette with a magnetic recording and reproducing device for standard tape cassettes, a special adapter was required to obtain a table loop equivalent to that of a standard tape cassette. However, the small tape cassette must be attached to and detached from the adapter, resulting in poor operability.

Therefore, the present applicant has previously applied for a patent in the patent application filed in 1983-28.
This paper proposes a magnetic recording/reproducing device that does not require the use of an adapter as shown in No. 7013. In this device, both standard tape cassettes and small tape cassettes can be selectively installed in the device without using a dedicated adapter, leading to improved operability.

On the other hand, for example, cassettes used in VHS standard VTRs include the above-mentioned standard tape cassettes and small tape cassettes, as well as tape cassettes using standard tapes (hereinafter referred to as normal cassettes) and high image quality during playback. There is a tape cassette (hereinafter abbreviated as S cassette) that uses high-quality tape (hereinafter abbreviated as S tape) aimed at
VTRs compatible with S cassettes are also available. Since the standard type and small size S cassette have substantially the same shape as the standard type and small size normal cassette, respectively, they have a tape type identification hole at a predetermined position so that they can be distinguished from the normal cassette.

Therefore, the conventional tape type discrimination mechanism, in which a detection means provided in the device detects the type of tape cassette installed in the device based on the presence or absence of a tape type discrimination hole, and the device performs corresponding recording/playback operations, etc. It is known from

Therefore, the patent application filed by the applicant earlier in 1983-28
In the magnetic recording and reproducing apparatus as shown in No. 7013, it is sufficient to provide a tape type discrimination mechanism at a position corresponding to the tape type discrimination hole of each tape cassette.

Problems to be Solved by the Invention However, with the above configuration, when a standard tape cassette is installed in the device, the tape type discrimination mechanism of the small tape cassette is located in a position that obstructs the installation operation.
The problem was that it was impossible to install a standard tape cassette.

In view of the above problems, the present invention aims to improve operability by attaching a small tape cassette to the device in the same way as a standard tape cassette, and uses an extremely simple mechanism to install a standard tape cassette without interfering with the operation of attaching the standard tape cassette. Type tape cassette ● Small tape cassette It is possible to detect the presence or absence of a tape type discrimination hole in both cassettes, and the purpose is to simplify the mechanism, reduce costs, and improve detection reliability.

Means for Solving the Problems In order to solve the above problems, the magnetic recording and reproducing apparatus of the present invention includes a tape drive means for driving a magnetic tape in a standard tape cassette or a small tape cassette smaller than the standard tape cassette; When the standard tape cassette is attached to the tape drive means, a detection means is located at a position corresponding to the tape type discrimination section of the standard tape cassette and detects the presence or absence of the tape type discrimination section of the standard tape cassette, and a small tape cassette. is capable of reciprocating movement between a first position where it can detect the discrimination section of the disc and operate the detection means, and a second position where it does not interfere with the operation of mounting the standard tape cassette on the tape drive means, and is in the first position; The apparatus is configured to include an actuating means for detecting the discrimination section of the small tape cassette and actuating the detecting means.

Operation The present invention has the above configuration, so that when a small tape cassette is mounted on the tape drive means, the actuation means operates the detection means in the first position depending on the presence or absence of the tape type discrimination hole; When the standard tape cassette is mounted on the tape drive means, the actuating means moves to a position where it does not interfere with the operation of mounting the standard tape cassette on the tape drive means, and the detection means detects the presence or absence of the tape type discrimination hole. It becomes possible.

Embodiments Hereinafter, magnetic recording and reproducing apparatuses according to embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a plan view showing a state in which a tape discrimination device of a magnetic recording/reproducing device according to an embodiment of the present invention detects the existence of a tape type discrimination hole in a small tape cassette, and Fig. 2 shows a state in which the tape discrimination device of a magnetic recording/reproducing device detects the existence of a tape type discrimination hole in a small tape cassette. The plan view, FIGS. 3 and 4, showing the state of detecting the absence of a hole is A- in FIG. 2.
A sectional view, FIG. 5 is a BB sectional view of FIG. 1 showing the operation of installing a small tape cassette into the device, and FIG. 6 shows the state of detecting the presence or absence of a tape type discrimination hole in a standard tape cassette. Plan view,. FIG. 7 is a sectional view taken along the line CC in FIG. 6, showing a state immediately before the standard tape cassette has been installed in the device, and FIG. It is a CC sectional view of the figure.

1 to 4, a chassis 10 is provided with tape drive means 13 for driving magnetic tapes (not shown) in a standard tape cassette 11 and a small tape cassette 12. Twelve tape cassettes are positioned to drive the supply side reel hubs (not shown) of the cassettes.

In the magnetic recording and reproducing apparatus of the present invention, the mechanism for mounting the standard tape cassette 11 and the small tape cassette 12 on the tape drive means 13 is, for example, disclosed in Japanese Patent Application No. 8
There is a magnetic recording/reproducing device as shown in No. 3-287013.

In FIG. 1, the conversion lever 52 is rotatable around a lever support shaft 51 installed on the chassis 10, and is guided by the lever support shaft 51 to move between arrows (3a) and (3) in FIG.
b) It is installed so that it can slide in the direction. Further, the conversion lever 52 has a bearing portion 53, a hole engaging portion 5, and a hole engaging portion 5, as shown in FIG.
The hole engaging portion 54 has a tapered shape as shown in FIGS. 3 and 4, and the operating portion 55 has a tapered shape as shown in FIG. 5. Further, the initial familiarization position of the conversion lever 529 is the position shown in FIG. The chassis 1 is engaged with the lower end surface 52a of the conversion lever 52.
A torsion compression spring 56 is installed on the top of the converting lever 52, and urges the conversion lever 52 in the direction of arrow (3a) and in the direction of arrow (1a) in FIG. In this way, the lever support shaft 51, the conversion lever 52, and the torsion compression spring 56 constitute an actuating means.

On the other hand, the locking rod 58 driven by a transmission force from a motor (not shown) has a rack portion 59a in a part thereof, and has a guide shaft eo mounted on the chassis 10. et, and is supported so that it can slide in the directions of arrows (lc) and (1d) in FIG.

As shown in FIG. 1 and FIG.
Rotation in the a) direction is restricted. 3 and 4 show a state in which the conversion lever 52 is restricted by the locking rod 59.

A locking pin 62 is planted on the locking rod 59,
It is movable integrally with the locking rod 59. When the locking rod 59 is in the position shown in FIG.
2 is configured such that its upper end surface 82a abuts against the lower end surface 52d of the locking portion 52c protruding from the conversion lever 52. At this time, the conversion lever 52 is restricted to the height shown in FIG. 3 and cannot be moved in the direction of the arrow (3b). On the other hand, the locking rod 59 is moved from the position shown in FIG.
lc) direction and is in the position shown in FIG. 6, the locking relationship between the locking portion 52c of the conversion lever 52 and the locking pin 62 is released, and the conversion lever 52 As shown in the figure, the direction of expansion and contraction of the torsion compression spring 56 (arrow (4)
a ), (4 b) directions).

Further, on the chassis 10, the operation of mounting the standard tape cassette 11 on the tape drive means 13 is not hindered, and when the standard tape cassette 11 is mounted on the tape drive means 13, the tape type of the standard tape cassette can be determined. A detection means 58 is provided at a position corresponding to the hole 11a. The input section 58a of the detection means 58 is capable of reciprocating in the directions of arrows (7a) and (7b) in FIG.
It is always biased in the direction of arrow (7a) by an SW spring (not shown). Therefore, when an external force in the direction of arrow (7b) greater than the spring biasing force is applied to the input portion 58a, the input portion 58a
a moves in the direction of arrow (7b), and as shown in FIG. 8, the switch section (not shown) is turned on at a stroke amount h. Further, when the external force in the direction of arrow (7b) is released from the on state, the input section 58a is activated by the SW spring (not shown).
The return force causes it to return to its original position and turn off.

If the locking rod 59 is now in the position shown in FIG.
Tapered portion 54a of hole engaging portion 54 in conversion lever 52
A force in the direction of arrow (3b) in Fig. 3 is applied to. Then,
As shown in FIG. 3, the conversion lever 52 is restricted from sliding in the direction of arrow (3b) by a locking pin 62, and is restricted from rotating in the direction of arrow (1a) in FIG. As a result, a moment is applied around the lever support shaft 51 in FIG. 1 in the direction of arrow (1b). Due to this rotation, one end surface 55a of the actuating part 55 and the input part 58a come into contact with each other, and the input part 58a is moved by the arrow (3) in FIG.
By moving in the b) direction, the SW unit (not shown) can be turned on. When the force is released, the return force of the torsion compression spring 56 moves the conversion lever S2 to the lever support shaft 5l.
The operating section 55 and the input section 58a are separated from each other to be in the OFF state.

Further, when the locking rod 59 is in the position shown in FIG.
Since the conversion lever 52 rotates further in the direction of arrow (1a) than the position shown in FIG. You will end up in a position where you won't.

At this time, the arrow shown in FIG.
When a force in the direction 3b) is applied, since the locking by the locking pin 62 is released, the conversion lever 52 is guided by the lever support shaft 51 and slides in the direction of the arrow (3b), and is torsionally compressed. The spring 56 is compressed in the direction of arrow (3b) and becomes the state shown in FIG. Further, when the force is released, the restoring force of the torsion compression spring 56 in the direction of arrow (3a) causes it to slide in the direction of arrow (3a) and return to the state shown in FIG. 3.

The operation of the magnetic recording/reproducing apparatus constructed as described above will be explained below with reference to FIGS. 1 to 8.

First, the case where a small tape cassette is used will be described.

Since the conversion lever 52 and the torsion compression spring 56 are restricted from rotating in the direction of arrow (1a) by the locking rod 59, they are at the initial position shown in FIG. 1 about the lever support shaft 51. Therefore, one end surface 55a of the actuating section 55 and the input section 58a of the detecting means 58 are spaced apart from each other by a certain distance i1iis. Further, the locking rod 59 is in the position shown in FIG. 1 due to a driving force from a motor (not shown). At this time, the locking pin 62 is located substantially below the locking portion 52c of the conversion lever 52. In FIG. 5, when the small tape cassette 12 is moved in the direction of the arrow (5b) from the state shown by the two-dot chain line and mounted on the tape drive means 13, the lower end surface 2b of the small tape cassette 12 engages with the hole of the conversion lever 52. It comes into contact with the tapered portion 54a of the portion 54. At this time, the lower end surface 52d of the locking portion 52c of the conversion lever 52 comes into contact with the upper end surface 82a of the locking bottle 62, so that the arrows (5 a ) and (5 b
) direction, and only rotational movement around the lever support shaft 51 is possible. Moreover, since the locking rod 59 is prevented from rotating in the direction of the arrow (La) in FIG. occurs.

Furthermore, when the small tape cassette 12 is moved downward in FIG. 5, if the tape type discrimination hole 12a of the small tape cassette 12 is present, the conversion lever 52 is rotated once in the direction of the arrow (1b) in FIG. However, due to the restoring force of the torsion compression spring 56, it rotates in the direction of arrow (1a), and the hole engaging portion 54 engages with the tape type determination hole 12.
It comes into contact with the hole 12c corresponding to a. In synchronization with this operation, the actuating part 55 once moves in the direction of turning on the input part 58a, that is, in the direction shown by the broken line in FIG. The input section 58a can be turned off by rotating in a direction away from the section 58a.

On the other hand, if there is no tape type discrimination hole 12a, the external force applied from the tape type discrimination hole 12a to the tapered portion 54a is not released, so as shown in FIG. back part 1
2}) and move the arrow (1b) around the lever support shaft 51.
Rotate in the direction.

Therefore, the actuating section 55 can press the input section 58a in the direction of the arrow (5b) to turn it on. In this way, it is possible to detect the presence or absence of the tape type discrimination hole in the small tape cassette 12.

Next, a case will be described in which a standard tape cassette is used.

First, by driving force from a motor (not shown), the locking rod 59 slides through the rack portion 59a from the position shown in FIG. 1 to the position shown in FIG. 6 while being guided by the guide shafts 60 and 61. At this time, the locking pin 6 on the locking rod 59
2 is not located substantially below the locking portion 52b of the conversion lever 52, the conversion lever 52 is guided by the lever support shaft 51 and moves in the direction of expansion and contraction of the torsional compression spring 56 (arrow) as shown in FIG. (4a), (4b) directions).

As shown in FIG. 7, when the standard tape cassette 11 is mounted on the tape drive means 13, the standard tape cassette 1
1 and the upper end surface 53a of the bearing portion 53 of the conversion lever 52 are in contact with each other. Then, the conversion lever 52 is guided by the lever support shaft 51 and slides in the direction of arrow (7b) in FIG.

From the state shown in FIG. 7, the standard tape cassette 11 is further moved in the direction of the arrow (7b). Here, as shown in FIG. 8, the tape type determination hole 1 of the standard tape cassette 11
If 1a is not present, the input section 58a is pressed by the lower end surface flb of the standard tape cassette 11 and turns on. On the other hand, if there is a tape type discrimination hole 11a, the input section 58a
is not pressed by the standard tape cassette 11,
The SW unit (not shown) is turned off. In this way, the tape type determination hole 11a of the standard tape cassette 11
It is also possible to detect the presence or absence of

In this embodiment, the tape type detection section is applied to the hole shape, but the shape is not limited to this, and may be any shape, such as an uneven shape or a square hole shape.

Although the locking rod 59 was driven by a motor (not shown),
The driving source is not limited to this.

For example, it may be driven in conjunction with the movement of a cassette mounting means (not shown).

Further, it goes without saying that the initial positions of the conversion lever and the locking rod are not limited to the positions shown in FIG. 1, but may be any position within the movable range.

Further, even if the locking rod and the locking pin are integrally formed, the same effect can be obtained and at the same time, the number of parts can be reduced.

Effects of the Invention As described above, the present invention can detect the tape type discrimination section of both a standard tape cassette and a small tape cassette with one detection means, and therefore can contribute to lowering the cost of the device. . In addition, when a standard tape cassette is attached to the tape drive means, the actuating means can be easily retracted to a position where it does not interfere with the attachment operation, and the simple structure allows the device to be simplified and made thinner. It is very advantageous for Furthermore, since there is no need to move the detection means depending on the position of the tape type discrimination section of each cassette, detection errors are small and high detection accuracy can be realized. At the same time, since no special positioning mechanism is required, this leads to high detection reliability and a reduction in the number of parts, which has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a state in which a tape discrimination device of a magnetic recording/reproducing apparatus according to an embodiment of the present invention detects the presence of a tape type discrimination hole in a small tape cassette, and FIG. The plan view, FIGS. 3 and 4, showing the state of detecting the absence of a hole is A- in FIG. 2.
A sectional view, FIG. 5 is a BB sectional view of FIG. 1 showing the operation of installing a small tape cassette into the device, and FIG. 6 shows the state of detecting the presence or absence of a tape type discrimination hole in a standard tape cassette. A plan view, FIG. 7 is a sectional view taken along the line C-C in FIG.
FIG. 8 is a sectional view taken along the line C--C in FIG. 6, showing a state in which the standard tape cassette has been completely attached to the tape drive means. 10... Chassis, 11... Standard tape cassette, 12... Small tape cassette, 13.
...Tape drive means, 51...Lever support shaft,
52... Conversion lever 53... Bearing part, 54
... Hole engaging part, 55... Operating part, 56... Torsion compression spring, 58... Detection means, 59... Locking rod, 6o, 61... Guide shaft, 62...・
Locking pin.

Claims (1)

[Scope of Claims] A tape drive means for driving a magnetic tape in a standard tape cassette or a small tape cassette smaller than the standard tape cassette; a detection means located at a position corresponding to the tape type discrimination part of the standard type tape cassette and detecting the presence or absence of the tape type discrimination part of the standard type tape cassette; The small tape cassette is reciprocally movable between a first position where the tape cassette can be operated and a second position that does not hinder the operation of mounting the standard tape cassette on the tape drive means, and when in the first position, the small tape cassette A tape discriminating device for a magnetic recording/reproducing device, comprising: actuating means for detecting a discriminating section and activating the detecting means.