JPH03201239A - Tape cassette loading device for magnetic recording and reproducing machine - Google Patents

Abstract

PURPOSE:To obtain a cassette loading device which does away with a first switch and does not require wires by using a tape end detecting means, which detects the end part of a magnetic tape, as the first switch. CONSTITUTION:An intercepting lever 15 is provided, and the lever does not intercept the optical path of a light emitting element when being in the first position for loading/unloading of a tape cassette 3 to/from a cassette holding body 1; but when the lever 15 is pressed and moved from the first position toward the second position by a prescribed extent, the lever slides and is operated while being engaged with the cassette holding body 1 to intercept the optical path, and a signal to given to a driving source is generated. This intercepting lever 15 does not intercept the optical path when being moved to the second position in accordance with movement of the cassette holding body 1 and functions to detect the end part of the magnetic tape. Consequently, a light receiving element 11 and the light emitting element are operated as the first switch. Thus, the expensive switch is omitted and connection of wires is unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape cassette mounting device for a magnetic recording/reproducing machine.

2. Description of the Related Art Conventionally, in magnetic recording and reproducing machines, the configuration shown in FIGS. 6 and 7 has been used as a device for loading a tape cassette containing a magnetic tape.

As shown in FIG. 6, a cassette holder 1 that removably stores a tape cassette 3 has an engaging pin 2 implanted on its side surface, and a pair of engagement pins 2 installed perpendicularly to a substrate (not shown). A first position where the tape cassette 3 is attached to and removed by engaging with an L-shaped guide groove 4a provided on the side plate 4, and a second position where the tape cassette 3 is engaged with the reel stand and is in an operating state. You can move freely between the two.

The engagement pin 2 on the side surface of the cassette holder 1 also engages with the engagement groove 61L of the rotary lever 6, and due to the rotational force of the drive source 20, which will be described later, the cassette holder 1 is moved into the guide groove 4a. It is configured to reversibly move back and forth between the first position and the second position along the line.

In general, the rotary lever 5 has a gear 5b provided coaxially with its rotating shaft, and a pin 4 provided on the side plate 4.
C is engaged with the first elongated hole 6b, and engaged with the rack 6a of the first drive lever 6, which is slidably mounted in the direction of the arrow M-B. Rotational motion is performed by motion.

On the first drive lever 6, engagement between the pin 4C and the 20th elongated hole 71L (which overlaps with the first elongated hole 6b in the figure) allows it to slide in the direction of arrow M-B. The attached second drive lever 7 is formed with a rack portion 7b that engages with a gear 201L that is reversibly rotationally driven by the motor 20, and the rotation of the gear 201L causes the arrow M-B to move.
It is configured to be driven in the direction.

A spring 8 is applied between the first drive lever 6 and the second drive lever 7, and the drive levers 6 and 7 are integrated by the elastic biasing force of the spring 8.

In the above configuration, the operation will be explained with reference to FIG. 8 which is a block diagram showing the main part of the control circuit of this device. When the tape cassette 3 is pushed into the housing in the direction of arrow F, the cassette holder 1 With this movement, the rotary lever 6 is rotated, and only the first drive lever 6 slides in the direction of arrow F against the elastic biasing force of the spring 8, due to the gear 6b and the rack portion 6a. be moved. At this time, the second
The drive lever 7 is engaged with the motor 20 via the rack portion 7b and remains stationary.

The first switch 9 is configured such that the cassette holder 1
When the drive lever 6 is in the position, it comes into contact with the contact portion 6C of the drive lever 6 and becomes a closed circuit state, and as the tape cassette 3 is pushed in from the first position, the first drive lever 6 is closed. , when it is slid by a predetermined amount in the direction of arrow B, it is released from the contact portion 6C and becomes an open state, and in this open state, the differential circuit 21 and the inverter 22 cause the motor 20 to rotate in the forward direction. A control signal is issued at 9 to the motor pivot circuit 23 to start the motor pivot circuit 23.

When the motor 20 rotates forward or clockwise, the gear 20! The second drive lever 7 is operated via L, and the first and second drive levers 6 and 7 are again integrated by the biasing force of the spring 8, and then the second drive lever 7 is operated. moves while pressing the engagement protrusion 6d formed on the first drive lever 6, and as the first drive lever 6 moves in the direction of arrow B, the rotary lever 5 rotates clockwise. However, the cassette holder 1 moves from the first position to the second position.

The third switch 13 is configured so that the cassette holder 1
When it moves to the position, it is driven by the protrusion 7C formed on the second drive lever 7 to close the circuit, and the differential circuit 24
A control signal is generated via the OR circuit 26 to the motor drive circuit 23 to stop the rotation of the motor 2o. That is, the first switch 9 is a switch that detects that the tape cassette 3 is pushed into the cassette holder 1 by a predetermined amount and starts the cassette mounting operation,
The third switch 13 allows the cassette holder 1 to
This switch detects that the second position has been reached and stops the cassette mounting operation.

When the tape cassette 3 is removed, when the cassette eject switch 26 is pressed, a reverse rotation instruction is issued to the motor drive circuit 23 by the differential circuit 27 and the OR circuit 28, and the motor 2o rotates in the reverse direction (counterclockwise). Along with this rotation, the second drive lever 7, the first drive lever 6, and the rotation lever 6 are moved in opposite directions, and the cassette holder 1 is moved toward the first position. .

When the motor 20 rotates in the reverse direction (when ejecting the cassette), the button is pressed, and the cassette holder 1 is moved to the first position 1.
When the second switch 12 is moved by the engagement protrusion 7C formed on the second drive lever 7, the second switch 12 is driven.
N, and the rotation of the motor 20 in the opposite direction is stopped. That is, the cassette eject operation is completed.

FIG. 7 is a plan view when the tape cassette is in the second position, 10 is a light emitting element, and the tape cassette 3 is in the second position. It is provided on the board so as to be inserted, and starts emitting light after the third switch 13 is switched, that is, after the cassette loading operation is completed, and stops emitting light when the ejecting switch is closed.

Reference numeral 11 denotes a tape end detection means consisting of a light receiving element, and when the cassette holder 1 is located at the second position, the through hole 3IL provided in the side surface of the tape cassette 3
, and is fixed at a position that receives light from the light emitting element 1o through a through hole 1a formed in the cassette holder 1.

The light-receiving element 11 has an opaque magnetic tape (not shown) included in the tape cassette 3 that is connected to the light-emitting element 10.
When blocking the optical path between the light-receiving element 11 and the light-receiving element 11, no light enters the light-receiving element 11, and when the magnetic tape runs out, a transparent tape is connected to the beginning and end of the magnetic tape. When light enters the light receiving element 11, the beginning or end of the magnetic tape is recognized.

Further, in FIG. 9, the above-mentioned operation is shown in the form of a chart.

The chart on the left shows the movement from the first position to the second position, and the chart on the right shows the reverse.

In the chart on the left, when the cassette holder 1 is in the first position, the light receiving element 11° and the light emitting element 1
0 is not in the operating state, both the first switch 9 and the second switch 12 are in the closed state, and the third switch 13 is in the open state, so it can be determined that the switch is in the first position. It has recognized. Here, when the tape cassette is pushed in by a predetermined amount, the first switch 9 is switched to an open state, and this signal causes the cassette holder 1 to
Driving is started from the first position to the second position (positive direction in the figure), and when the second position is reached, the third switch 13 is switched to a closed state, and is the driving source. The motor 20 finishes its operation, and the light emitting and light receiving elements 10 and 11
starts working.

Conversely, in the chart on the right, the light emitting and light receiving elements 1
0.11 is in the operating state, and when ejecting the tape cassette is selected by the separate ejecting switch 26, the light emitting and light receiving elements 10.11 stop operating, and the drive source 2o is driven in the opposite direction. When the second switch 12 is in the first position, the switching of the second switch 12 to the closed circuit is recognized and the operation of the drive source 2o is ended.

Problems to be Solved by the Invention In the above configuration, the first switch 9 detects the amount of insertion of the tape cassette 3, so if the accuracy of the detection is determined, the cassette holder 1 or this cassette A lever (rotary lever 5.
It is generally attached to the side plate 4 so as to be driven by contacting the first drive lever 6).

However, various drive means operate on the side plate 4, and it is difficult to connect the wire from the first switch 9 to the main printed circuit board 1, and
The switch 9 itself is also expensive because it uses an expensive metal such as gold or silver for its contacts.

In order to improve the above-mentioned problem, the present invention eliminates the need for the first switch by using a tape end detection means for detecting the end of the magnetic tape as the first switch.
Moreover, the present invention provides a cassette mounting device that does not require a wire.

Means for Solving the Problems In the cassette loading device of the present invention, in addition to the conventionally used light emitting means and light receiving means provided for detecting the edge of a magnetic tape, the tape cassette is attached to a cassette holder. When the cassette holder is pressed and moved by a predetermined amount in the direction of the second position from the first position without blocking the optical path of the light emitting means, A cutoff lever is disposed that operates while slidingly engaging with the cassette holder to block the optical path and provide a signal to a drive source, and this cutoff lever operates in conjunction with the movement of the cassette holder to In the second position, the optical path is not interrupted and the end of the magnetic tape is detected in the same way as in the conventional case, and the light receiving means and the light emitting means also operate as the first switch. It is composed of

Effect: The above configuration eliminates the expensive first switch that was conventionally provided specifically to detect when the inserted amount of tape cassettes has reached a predetermined amount, and this eliminates the complicated and difficult manufacturing process. Wire connections from the first switch to the main circuit board 1 can be made unnecessary.

Embodiment Hereinafter, an embodiment of a tape cassette loading device for a magnetic recording/reproducing machine according to the present invention will be described with reference to the drawings.

FIGS. 1 to 3 are front views showing different operating states of an embodiment of the present invention, and parts having the same functions as those of the conventional example are given the same reference numerals and explanations thereof will be omitted. In addition, in FIG. 3, for simplicity, 1. Parts such as the second drive lever are omitted.

The difference from the conventional example is as follows.

That is, in FIG. 1, reference numeral 15 is rotatably provided around a shaft 4d provided on the side plate 4, has an engaging portion 16a with the cassette holder 1 at the negative end, and has an engaging portion 16a on the side plate 4 at the other end. This is a cutoff lever having a cutoff portion 15b located near the provided restriction window 4b, and shows the first position where the tape cassette 3 is attached/detached.

16, the cutoff lever 16 is connected to the cassette holder 1;
This is a second spring that elastically biases the cutoff lever 16 in the C direction so as to elastically engage with the cutoff lever 16 .

FIG. 2 shows a state in which the tape cassette 3 is pushed into the housing by a predetermined amount and a signal is generated to cause the drive source 2o to start driving, and the cassette holder 1 is pushed in by a predetermined amount. Then, the cassette holder 1 and the cutoff lever 16 are engaged and rotated at the engaging portion 151L, and the cutoff portion 15b covers the restriction window 4b, so that no light enters the light receiving element 11. Show that.

FIG. 3 shows the second stage in which the tape cassette 3 is in an operating state.
This figure shows the state in which the cassette holder 1 and the engaging portion 15 are moved further from FIG.
b is engaged and rotated, and the blocking portion 15b is removed from the limiting window 4b, allowing light to enter the light receiving element 11.

The operation of the above configuration will be explained with reference to FIG. 4, which is a block diagram showing the main parts of the control circuit, and FIG. 6, which is a chart summarizing the operation. In FIG. 5, the left side shows the movement from the first position to the second position, and the right side shows the movement from the second position to the first position.

Press the button on the chart on the left and also in the first position,
In this embodiment, the light emitting element 1o is always in an operating state.
The light receiving element 11 is in a light receiving state. The tape cassette 3
When the light-receiving element 11 is pushed a predetermined amount from the first position toward the second position (i.e., the state shown in FIG. 2), the light-receiving element 11 changes from the state in which it was sensitive to light (closed circuit state). A negative pulse is generated in the differentiating circuit 21 which switches to an open state. This signal is because the third switch 13 is in the open state, the relay is open, and the relay B is closed.9 The recognition is changed to the insertion of the tape cassette instead of the end of the tape. Then, the inverter 22 reverses the rotation, and the motor drive circuit 23 drives the drive source motor 2o in the forward direction (from the first position to the second direction).
This is a command signal to start driving, and the drive source 20 starts driving (relay B has a contact that turns ON when the signal to the coil is OFF).

Thereafter, as the cassette holder 1 moves, the cutoff lever 15 no longer covers the front of the light receiving element 11 until the cassette holder 1 reaches at least the second position (FIG. 3); It becomes possible for light from the light emitting element to reach there. Further, upon recognizing that the third switch 13 switches from an open state to a closed state and reaches the second position, a 5TOP instruction is given to the motor drive circuit 23 through the differential circuit 24-OR circuit 26, and the motor drive circuit 23 is driven. At the same time, the operation of the source 20 is terminated, and the contact of the relay B is closed, and the contact of the relay B is opened, and the reaction of the light receiving element 11 is detected from the operation signal source of this cassette loading device to recognize the original end of the tape. In other words, the signal source is switched to the original signal source.

In addition, in the chart on the right, there is a separate eject switch 2.
6, when the tape cassette ejecting operation is selected, a reverse rotation instruction is issued to the motor drive circuit 23 via the differential circuit 27, and the drive source 20 is driven in the opposite direction (counterclockwise) to the forward direction. Thereafter, the reaction of the light receiving element 11 is such that in response to the opening of the switch 3, the opening and closing of the relay B is reversed, and this cassette loading device receives a signal from the conventional signal source for recognizing the end of the tape. The signal source for operation is switched to . Thereafter, with the movement of the cassette holder 1, the second switch 12 is switched from the open state to the closed state at the first position, and the signal is passed through the differential circuit 2B-OR circuit 26. 5 to motor drive circuit 23
A TOP instruction is issued to stop the operation of the drive source 2o.

Here, as mentioned above, the second. Third switch 12.13
In order to operate on a one-to-one basis with respect to the drive source 20, it is possible to mount it near the drive source 2o, that is, on the board, so that from the side plate 4 to the main circuit board,
It is possible to eliminate the need for complicated and difficult wire rod connections.

In this embodiment, the light emitting element 1o is always lit even when no tape cassette is inserted, but in order to extend the life of the light emitting element 10, it is necessary to Until the second position (operating position) is reached, the ratio of the period when the light is on and the period when the light is off is T.
1, the light emitting element 10 is turned on, and after it is located at the second position, the ratio is set to T2 (T2 > TI), and in synchronization with the lighting of the light emitting element 10, the light receiving element 11 is turned on only when the light emitting element 10 is turned on. All you have to do is configure it so that it works.

That is, when using the light receiving element 11 as a tape end detection element, the detection period is lengthened in order to perform detection with less time delay, and if the cassette is inserted while the cassette is inserted, the detection of the cassette insertion may be delayed even if there is a slight delay. Since there is no particular problem, the detection period (emission time of the light emitting element 10) is shortened to extend the life of the light emitting element 10. This switching can be done by detecting the state of the third switch 13.

In the embodiment, the control circuit is constructed using discrete components, but it may be controlled by a microcomputer that performs the same function.

Effects of the Invention As is clear from the description of the embodiments above, according to the present invention, in conjunction with the cassette mounting operation of the cassette holder,
Temporarily blocks the optical path to the light receiving element for tape edge detection,
At least before starting the recording/reproducing operation, a cutoff lever is provided to release the cutoff, and during this time the role of the light receiving element is switched, and the light receiving element for tape end detection is used as a switch for the drive source that drives the cassette loading device. Since the cassette mounting device also utilizes the cassette mounting device, an expensive switch can be eliminated, there is no need to run a wire near the drive means, and a cassette mounting device that is easy to manufacture can be realized.

[Brief explanation of drawings]

FIGS. 1 to 3 are side views showing different states of buttons of an embodiment of the cassette loading device of the present invention, respectively;
Fig. 4 is a block diagram of the main parts of the control circuit of the device, Fig. 6 is a timing chart for explaining the operation of the device, Fig. 6 is a side view of the conventional cassette loading device, and Fig. 7 is the conventional cassette loading device. A plan view of the main parts showing a cassette loading device and a conventional magnetic tape end detection device, FIG. 8 is a block diagram of the main parts of the control circuit of the conventional device, and FIG. 9 is for explaining the operation of the conventional device. This is a timing chart. 1... Cassette holder, 2... Engaging pin, 3... Tape cassette, 4... Side plate, 4a... Guide groove , 4b...Limit window, 4C...Bin, 4d...Axis, 6...
...Rotary lever, 6a...Engagement groove, 6b.
... Gear part, 6 ... First drive lever,
6a... Rack part, 6b... First elongated hole, 6C... First contact part, 6d...
Engagement protrusion, 7...Second drive lever T&...
... second elongated hole, 7b ... second rack part,
7G... Second contact portion, 8... First spring, 9... First switch, 10...
・Light emitting element, 11... Light receiving element, 12...
...Second switch, 13...Third switch, 16...Cut-off lever, 15! L...
Engagement part, 15b...Blocking part, 16...
Second spring, 20... Drive source (motor), 20
! L...Gear section.

Claims (1)

[Claims] A tape cassette housing a supply reel and a take-up reel wound with magnetic tape each having a transparent tape attached to a starting end and a trailing end, a cassette holder for removably storing the tape cassette, and a cassette holder for storing the tape cassette. a moving means for reversibly moving the body between a first position where the tape cassette is attached/detached and a second position where the tape cassette supply and take-up reel engages with a reel stand; and the cassette holder. a light source provided on a substrate to be inserted into the tape cassette when the body is in the second position; and a magnet in the tape cassette when the cassette holder is in the second position. tape end detection means provided on the substrate to face the light source through a through hole formed in the housing of the tape and the tape cassette and to respond to the presence or absence of light irradiation from the light source; and the cassette holder. interlocking with the insertion operation of the tape cassette from the first position to a predetermined position, blocking light between the light source and the tape end detection means, and moving the cassette holder to the second position; a light blocking means for releasing the blocking state before the recording/reproducing operation is performed; and a means for starting the driving of the moving means by an output from the light blocking means of the tape end detecting means before the recording/reproducing operation. A tape cassette loading device for a magnetic recording/reproducing machine.