JPH04321958A - Cassette loading and recording discriminating device - Google Patents

Abstract

PURPOSE:To detect whether a cassette is loaded or not and whether an erroneous erasure preventive claw of the cassette exists or not by operating twice a single leaf switch of one circuit and two contacts. CONSTITUTION:A leaf switch 12 being in a turn-on state through a turning lever 8 having a tongue 8a abutting on a projecting piece 2a of a holder 2 in a cassette discharge position is turned off by a movement of a holder 2 by a cassette loading operation, and on the way on which the holder concerned 2 carries a cassette in the horizontal and the vertical directions by a driving means, a projection 8b of the turning lever 8 abuts on the lower part of the side face of the cassette again and the switch 12 is turned on once, and the projection 8b abuts on the subsequent erroneous erasure preventive claw 10 part. In that case, when the claw 10 exists, the switch 12 holds the turn-on state, and in the case the claw 10 does not exist, the switch 12 is turned off through the turning lever 8 again. By supplying a switching signal of the switch 12 to a system controller, whether the cassette is loaded or not and whether the claw 10 of the cassette exists or not are detected.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for determining whether or not a cassette is installed in a magnetic recording/reproducing apparatus such as a video tape recorder (hereinafter referred to as VTR) and whether or not the cassette has a claw to prevent accidental erasure.

0002

2. Description of the Related Art Generally, in a magnetic recording/reproducing device such as a VTR, a single detection method is used to determine whether or not a cassette is installed and whether there is a claw provided on the cassette to prevent accidental erasure. A configuration in which this is done mechanically using a lever is disclosed in Japanese Utility Model Publication No. 55-50826.

[0003] Also, Japanese Utility Model Application No. 61-40731 (G
11B 15/07) is equipped with a first pressing piece for detecting the presence or absence of a cassette attachment and a second pressing piece for detecting the presence or absence of an erroneous erasing claw on the cassette, and is a leaf switch with two circuits and two contacts. A configuration is disclosed that electrically determines whether a cassette is attached and whether recording is possible.

0004

[Problem to be solved by the invention] Like a front-loading VTR, the cassette is mounted in a holder,
In a device having a mechanism for transporting the cassette to the tape draw-out position by driving the holder with a drive means, when the cassette is mounted on the holder, it is detected that the cassette is normally mounted, and the drive means is activated. However, in the former configuration using a single detection lever, the configuration is complicated to realize this, and it is difficult to arrange it in a small space.

In addition, in the latter case, two circuits of detection switches are required, but in the configuration of the present invention, a single leaf switch with one circuit and two contacts is used, which saves space by reducing the number of wiring leads and downsizing components. The aim is to

[0006]

[Means for Solving the Problems] The present invention provides a rotation mechanism in which a tongue piece that faces and abuts against a protrusion provided on a holder for transporting a cassette, and a protrusion that abuts against an accidental erasure prevention claw portion of the cassette are formed at one end. A lever is provided with a spring biased in one direction, and a single leaf switch with one circuit and two contacts is disposed opposite to the other end of the rotary lever, and the rotation of the motor that drives the holder is stopped via a system controller. The leaf switch is actuated by the movement of the holder when a cassette is installed, and the first signal to determine whether the cassette is installed is sent to the system controller. The single leaf switch is actuated at least twice by contacting the cassette claw and activating the leaf switch again to send a second signal to the system controller to determine whether or not recording is possible.

[0007]

[Operation] When a cassette is installed, the holder moves, and the movement of the holder activates a switch to determine whether the cassette is installed and drives the motor via the system controller. The holder transports the cassette by the rotation of the motor,
Near the end of transport of the cassette, the protrusion of the rotary lever comes into contact with the accidental erasure prevention claw of the cassette, and the rotary lever rotates again and activates the switch again to detect the presence or absence of the claw on the cassette, and record the data. Determine whether or not it is possible.

[0008]

[Embodiment] Hereinafter, a specific embodiment will be described in detail with reference to the drawings. The drawings are all related to the present invention; FIGS. 1(a) and (b) are a plan view and a front view of the main parts thereof, FIG. 2 is a plan view when the cassette is installed, and FIG.
Figure 4 is a plan view of a cassette with a claw to prevent accidental erasure while it is being transported.
a) and (b) are diagrams of the cassette without accidental erasure prevention claws being transported and its front view, Figure 5 is an exploded perspective view of the main parts, Figure 6
is an external perspective view, FIG. 7 is a circuit block diagram, FIG. 8 is a timing chart showing the relationship between the mode switch and leaf switch, FIG. 9 is a flow chart showing the operation of the system controller when a cassette is installed, and FIG. 10 is a diagram when ejecting a cassette. A flowchart showing the operation of the system controller is shown.

First, with reference to FIGS. 5 and 6, the front loading device 1 of the present invention includes a holder 2 on which a cassette C is placed, and a holder 2 on which the cassette C is placed until the tape is pulled out from the cassette. a gear 3a for conveying the cassette C;
Drive mechanism 3 composed of links 3b, linear racks 3c, etc.
, the drive mechanism 3 is disposed, and the holder 2
It is constructed by assembling a chassis 7 with left and right side plates 4, 4 having guide grooves 4a, 4b cut out therein for slidingly guiding them in the horizontal and vertical directions, a top plate 5, and a front plate 6.

A rotary lever 8 serving as an actuating means is rotatably attached to the bearing portion 6a of the front plate 6 and is biased clockwise in FIG. 1 by a spring 9. The tongue piece 8a is in contact with the protruding piece 2a of the holder 2. A protrusion 8b is formed on the rotary lever 8 at a position opposite to an accidental erasure prevention claw 10 of a cassette C, which will be described later, and the other end is used to turn on a leaf switch 12 with one circuit and two contacts attached to the board 11. A protruding piece 8c for controlling /OFF is integrally formed.

With the above-described configuration, the switch 12 remains in the ON state in the state shown in FIG. 1 in which the cassette C is not installed. Next, install cassette C (see Figure 2).
When the cassette C is pressed in the direction of the arrow A, the cassette C is attached to the holder 2, and the holder 2 moves together with the cassette C in the direction of the arrow A. As a result, the protruding piece 2 of the holder 2
a is separated from the tongue piece 8a of the rotary lever 8, the rotary lever 8 rotates clockwise and releases the pressure on the switch 12. This turns off the switch 12 and detects that the cassette C has been installed.

When the switch 12 is turned from ON to OFF, the first determination signal from the switch 12 is input to the system control microcomputer (hereinafter referred to as system controller) 13, as shown in FIG. A signal is output from the system controller 13 to the loading motor drive circuit 14, and the loading motor 15 is rotationally driven via the drive circuit 14. The rotation of the motor 14 transports the cassette C in the horizontal and vertical directions with the cassette C placed on the holder 2 . At this time, the mode switch 17, which is a rotary switch for detecting each operating mode of the mechanism 16, also rotates.

When the holder 2 transports the cassette C to the position where the tape is pulled out from the cassette C, a mode signal is output from the mode switch 17 to the system controller 13, and an instruction signal is output from the system controller 13, causing the rotation of the motor 15 to be stopped. Stop. When the holder 2 descends and the cassette C approaches the tape pull-out position, the protrusion 8b of the rotating lever 8
comes into contact with the lower side surface of the cassette C, and the rotating lever 8
Rotate counterclockwise once.

[0014] Therefore, the switch 12 is temporarily turned on. When the holder 2 is further lowered, if the cassette C has a claw 10, the protruding piece 8b remains in contact with the claw 10, and the switch 12 is held in the ON state (see FIG. 3). Further, if the cassette C does not have the claw 10, the protruding piece 8b contacts the lower side surface of the cassette C and turns on the switch 12 once, but when the holder 2 further descends, the protruding piece 8b
Since it penetrates into the recess at part 0 and releases the pressure on the switch 12 again, the switch 12 is turned off (see FIG. 4).

As the cassette loading continues, the cassette C reaches a position where the tape is pulled out from the cassette. That is, the mode switch 17 detects the cassette IN mode and uses this point as a trigger to stop the motor 15 with a time lag. The completion of the cassette installation is determined by the fact that the cassette C is in the cassette IN mode and the sensing states of the supply reel end sensor and the take-up reel end sensor (both not shown). As described above, depending on the presence or absence of the claw 10 of the cassette C, the system controller 13 detects that the protrusion 8b of the rotary lever 8 turns the switch 12 on or from ON to OFF, determines whether recording is possible, and records the video. An instruction signal is output to the circuit 18.

Table 1 shows the data terminals ■, ■, ■, of the mode switch 17 for each operation mode of the mechanism 16.
This shows the bit signal relationship of (2). In the present invention,
EJECT mode in operation mode 1 and ST in operation mode 2
Only the OP mode (cassette IN) will be explained with reference to the timing chart in FIG. 8 and the flowcharts in FIGS. 9 and 10.

[0017]

[Table 1]

First, EJECT mode (Mode No. 1
), mode switch (hereinafter referred to as mode SW) 1
The bits of data terminals #7 to #7 are in the state of 0001 (Lo level = 0, High level = 1). Now, when the cassette C is installed, the S
TART (step 21), cassette installation (step 2)
2) After the cassette is pushed in (step 23), the leaf switch (hereinafter referred to as leaf SW) 12 is turned off by the movement of the holder 2 (step 24). At this time, if the leaf SW 12 does not detect OFF, the cassette C is pushed in again (step 23). When leaf SW12 turns OFF, motor 1 is turned off in step 25.
5 is turned ON, and mode No. 5 in Table 1 is turned on. 1 is completed, the transition mode of step 27 is entered, and the holder 2 transports the cassette C in the horizontal direction. At this time, the bit of the mode SW17 becomes 0000 (the data terminal ■ changes from Hi to Lo).

When the motor 15 further rotates and the holder 2 is conveyed in the vertical direction, and the cassette loading is completed, the mode SW 17 changes to the mode No. in step 28. 2 is sensed, and the bit becomes 0010 (data terminal ■ changes from Lo to Hi). The motor 15 is stopped with a time lag (step 29) (step 30). At this time, the leaf SW 12 is turned off in step 31 as described above.
From F to ON, or from OFF to ON and then to OFF. That is, in step 31, it is determined whether or not the cassette hook 10 is present, and if YES, in step 32, the video circuit 18 is placed in a recordable standby state. Also, N
In the case of O, the video circuit 18 is placed in a recordable state (step 33). The timing of detecting the presence or absence of the claw 10 on the cassette C is as shown in the timing chart of FIG.

To take out the cassette C, the EJECT button 40 (see FIG. 7) is operated as shown in FIG. 10, and the EJECT-SW 40 is turned ON in step 41. If NO, operate the EJECT-SW40 again. If YES, the motor 15 is turned on and rotates in the reverse direction in step 42, and the holder 2 is conveyed in the opposite path to that when the cassette C was attached. Thereafter, steps 43 to 49 are performed as shown in the flowchart of FIG. 10, and removal of the cassette C is completed.

[0021] Note that the mode No. in Table 1. 3 STOs
P mode refers to a state in which the tape is pulled out from cassette C. In addition, in FIG. 8, LO/Mo means motor 15,
Lo means cassette loading and UNLo means cassette unloading (EJECT).

[0022]

Effects of the Invention The present invention provides a rotary lever with two actuating parts, and moves a single 1-circuit 2-contact switch by moving the holder by mounting the cassette and moving the cassette.
By operating the cassette twice, it is possible to detect whether the cassette is installed or not, and whether there is a claw to prevent accidental erasure of the cassette.This reduces the number of parts, simplifies electrical wiring, and reduces assembly work. Great effect.

[Brief explanation of the drawing]

FIG. 1 is a plan view and a front view of the main parts of a specific embodiment of the present invention.

FIG. 2 is a plan view of the main parts of the present invention when the cassette is installed.

FIG. 3 is a plan view of the cassette with an erroneous erasure prevention claw according to the present invention during transportation;

FIG. 4 is a plan view and a front view of the cassette without an erroneous erasing claw of the present invention during transportation.

FIG. 5 is an exploded perspective view of the main parts of the present invention.

FIG. 6 is an external perspective view of the present invention.

FIG. 7 is a circuit block diagram of the present invention.

FIG. 8 is a timing chart diagram showing the relationship between the mode switch and leaf switch of the present invention.

FIG. 9 is a flowchart showing the operation of the system controller when the cassette of the present invention is attached.

FIG. 10 is a flowchart showing the operation of the system controller during cassette ejection according to the present invention.

[Explanation of symbols]

2 Holder 3 Holder drive mechanism 8 Rotating lever (operating means) 10
Cassette accidental erasure prevention claw 12 Leaf switch (first switch) 13 System controller 15 Motor 17 Mode switch (second switch) 1
8 Video circuit

Claims (4)

[Claims] 1. A cassette mounting device comprising a holder for holding a cassette and a drive means for transporting the holder, and reciprocating between a position for mounting the cassette and a position for transporting the cassette and pulling out a tape from the cassette.
The device includes an actuation means that operates at least a plurality of times, and a switch that is ON/OFF controlled via the actuation means, and when the cassette is attached, the switch is actuated via the actuation means and a first discrimination signal is output. The cassette loading and recording discriminating device is characterized in that the switch is actuated again via the actuating means during the conveyance of the cassette to output a second discriminating signal. 2. The actuating means is integrally formed with a tongue piece formed opposite to a protruding piece formed on the cassette holder, and a protrusion formed opposite to an accidental erasure prevention claw of the cassette. 2. The cassette mounting and record discriminating device according to claim 1, wherein the cassette loading and recording discriminating device is a rotary lever that is biased in one direction. 3. The cassette loading and recording discriminating device according to claim 1, wherein said switch is a single leaf switch having one circuit and two contacts. 4. O at least a plurality of times by actuating means.
a single first switch that is N/OFF controlled; a second mode switch for setting a mechanism operation mode that is driven by the rotational driving force of a motor; a system controller to which the first switch and the second switch are connected; It is equipped with a video circuit for recording and playback connected to a system controller, and the motor driven by a signal from the system controller, and when a cassette is attached, the first switch is actuated to output a first discrimination signal and the motor is driven. cassette mounting and recording discrimination characterized in that the second mode switch is driven while the cassette is being rotated, and the first switch is actuated again by the actuating means during the movement of the cassette to output a second discrimination signal. Device.