JPH083930B2 - Door closing mechanism for cassette loading mechanism - Google Patents

Description

The present invention relates to a door closing mechanism of a cassette loading mechanism.

(B) Prior art A cassette loading mechanism such as a video tape recorder allows a cassette holder to be taken out by rotating a door, which is normally biased in a closing direction, inwardly substantially horizontally when a cassette is unloaded. , There is no room for dust to enter in the unloading state because the door is closed in conjunction with the removal of the cassette, but smooth insertion of the cassette could not be expected because there is no guide when inserting the cassette.

In view of this, Japanese Patent Laid-Open No. 61-27615 (G11B 15/665) makes it easy to mount a cassette by pulling out the cassette holder.

(C) Problems to be Solved by the Invention However, as described above, the front loading mechanism for mounting the cassette on the cassette holder or the door with the cassette holder pulled out or the door being rotated outward is Dust enters when the cassette is not placed.

Therefore, it is possible to automatically store the cassette holder when the cassette is not placed, or to store the door in conjunction with the backward movement of the cassette holder, but to return to the original unloading state quickly when mounting the cassette. is necessary.

(D) Means for Solving the Problems In view of the above-mentioned problems, the present invention detects the presence / absence of a cassette on the cassette holder at the unloading position and a time limit for counting the non-mounting period of the cassette. Means and means for moving the cassette holder in the loading direction based on the output of the timing means and for stopping the cassette holder at the position where the door is closed and before the loading position. It is characterized by doing.

(E) Therefore, according to the present invention, if the cassette is not mounted for a certain period or more during unloading, the cassette holder retracts and the door is closed based on the output of the time limiter, which is even before the loading position. The cassette holder is electrically or mechanically stopped at the position.

(F) Embodiment FIG. 1 shows a state in which the door (6) of the loading device is open, and FIG. 2 shows a state in the middle of loading. When the cassette holder (5) is empty, it stands by in this state. Third
The figure shows the loading completed state, and FIG. 4 shows the state in which the door (6) is manually closed from the first state.

1 to 4, the diagonal lines on the first lever (2) are not the lines showing the cross section but the shape of the cam (23) formed on the back side of the first lever as described later. , Second
The diagonal lines on the lever (3) are provided to make the shape of the second lever easier to understand.

As shown in FIG. 1, a cassette insertion port (11) is opened in the upper part of the front panel (1) of the magnetic recording / reproducing apparatus, and a front door (6) is rotatably attached to the insertion port downwardly toward the front. It is biased in the closing direction by the 1 spring (63).

As shown in FIG. 6, the door (6) has end plates (60) projecting from both ends, and the end plates contact the upper edge (10) of the inlet (11) of the front panel (1). It has a contact surface (61) for restricting the opening angle of the door to 90 ° and an arcuate pressing portion (66) for pressing the cassette holder (5) inward as described later.

Further, the end plate (60) is provided with an opening / closing shaft (65) which is engaged with a door rotation support shaft (64) and an auxiliary lever (4) described later to open and close the door (6).

A loading device is provided inside the front panel (1), and the loading device has a pair of side plates (13) projecting from both sides of the chassis (12) and a cassette holder (5) provided between the side plates (13). Then, the short shafts (51) (52) projecting from the holder (5) are slidably fitted into the substantially L-shaped guide groove holes (14) (14) opened in each side plate (13). ing.

The holder (5) retreats substantially horizontally along the guide groove holes (14) (14) and changes its direction downward at the bent portion of the groove hole to move.

The holder (5) is biased toward the door (6) by a third spring (not shown), and when the holder is located on the door side, the height of the bottom surface of the holder (5) is the door in the open state. It is aligned with the height of the inner surface (62) of (6).

A lever device (20) including a first lever (2) and a second lever (3) is provided at a lower portion of a substantially central portion of both side plates (13).

A sector gear (22) is formed on the first lever (2) concentrically with the center of rotation of the lever, and the gear is an intermediate gear (30).
Is connected to the drive gear (35) via.

The gear shaft (36) of the drive gear (35) is connected to a loading motor (neither is shown) via a transmission means. The loading motor stops automatically when overloaded.

The tip of the first lever (2) and the short shaft (51) of the cassette holder (5) on the door (6) side are pivotally connected by a link plate (27).

The second lever (3) is rotatably supported on the pivot shaft (34) of the one intermediate gear (30) regardless of the rotation of the gear.
The pivot (34) penetrates the middle part of the second lever (3). An auxiliary lever (4) is rotatably supported in a vertical plane at one end of the second lever on the door side.

As shown in FIGS. 7 and 8, the auxiliary lever (4) is
The auxiliary lever (4) and the second lever (3) rotate integrally with each other while being constantly urged counterclockwise by the spring (43) and hitting the stopper (33) provided on the second lever (3).

As shown in FIG. 1 to FIG. 2 or FIG. 3, a guide groove (41) is formed in the auxiliary lever (4) and the guide groove (4) is formed.
The opening / closing shaft (65) of the door (6) is slidably fitted in 1).

The tip of the guide groove (41) is open, and a lock portion (9) engageable with the opening / closing shaft (65) of the closed door (6) is formed at the open end.

When the auxiliary lever (4) and the second lever (3) integrally rotate clockwise, the downward force acts on the opening / closing shaft (65) while being guided by the groove (41), and the door (6) is closed.

The other end of the second lever (3) is engaged with the cam (23) of the first lever (2) by a first contact portion (31) and a second contact portion (32).
Are formed.

The cam (23) has a pressing crest surface (24) for pressing the first contact portion (31) and a relief trough surface (25) for allowing the first contact portion (31) to escape.
And a hook portion (26) which engages with the second contact portion (32) and prevents the first lever (2) from rotating in the counterclockwise direction.

As shown in FIG. 1, the first contact portion (31) of the second lever (3)
Is in contact with the pressing mountain surface (24) of the cam (23),
The second lever (3) is prevented from rotating clockwise, and the auxiliary lever (4) on the second lever (3) resists the first spring (63) that biases the door (6) in the closing direction. The open / close shaft (65) of the door (6) is lifted upward to keep the door (6) open.

As shown in FIG. 2, the first lever (2) rotates counterclockwise and the pressing crest surface (24) of the first lever (2) comes off from the first contact portion (31) of the second lever (3). Then, the door (6) is closed by the first spring (63), and the opening / closing shaft (6) of the door (6) is closed.
The auxiliary lever (4) and the second lever (3) engaged with 5) are rotated clockwise to move the first lever of the second lever (3).
The contact part (31) corresponds to the relief valley surface (25) of the cam (23), and the second contact part (32) of the second lever (3) is the cam (23).
Engages with the hanging portion (26).

A sensor for detecting the presence or absence of the cassette (7) on the cassette holder (5) is provided inside the front panel (1), and a pair of side plates (1) for supporting the holder (5) is provided.
3) A loading start switch (81) is provided on one side.

The start switch (81) is operated by a projecting piece (28) on a link plate (27) that pivotally connects the first lever (2) and the cassette holder (5).

Next, loading and unloading when the magnetic recording / reproducing apparatus is normally energized will be described.

Loading Operation As shown in FIG. 2, when the door (6) is closed and the holder (5) is in the standby position, operating the open button (not shown) provided on the front panel causes the loading motor to rotate, First through the drive gear (35) and the intermediate gear (30)
The lever (2) rotates clockwise and presses the cassette holder (5) toward the door (6) via the link plate (27).

As the first lever (2) rotates clockwise, the pressing crest surface (24) of the cam (23) of the first lever (2) causes the first contact portion of the second lever (3) to move as shown in FIG. Press (31) to rotate the second lever (3) counterclockwise.

The auxiliary lever (4) on the second lever (3) also rotates counterclockwise integrally with the second lever (3) and lifts the opening / closing shaft (65) of the door (6) to open the door (6). .

The start switch is turned off by the projecting piece (28) on the link plate (27) connecting the auxiliary lever (4) and the cassette holder (5), and the loading motor stops (FIG. 1).

Next, slide the inner surface (62) of the door (6) to the cassette (7).
Then, the cassette (7) is placed on the holder (5) waiting at the same height as the inner surface.

When the loading of the cassette (7) is detected by the sensor (8) and the close button provided on the front panel is operated, the loading motor rotates in the opposite direction to the above, and the first
The lever (2) rotates counterclockwise and moves the cassette holder (5) in the loading direction.

When the first lever (2) rotates in the counterclockwise direction, the pressing mountain surface (24) of the cam (23) of the first lever (2) moves from the first contact portion (31) of the second lever (3). Because
The door (6) tries to close due to the urging force of the first spring (63), but the door (6) does not close because the cassette (7) is on the door (6). Therefore, the second lever (3) maintains the state shown in FIG. 1 without rotating, and only the second lever (2) rotates. Cassette (7)
When is removed from the door (6) and enters the insertion port (11), the door (6) is closed by the first spring (65), and the second lever (3) is delayed and pivoted clockwise. When the second lever (3) rotates, the first lever (2) is at a position where the hooking portion (26) of the cam (23) does not engage the second contact portion (32) of the second lever (3). The first lever (2) is rotated counterclockwise without any trouble, and the cassette holder (5) and the cassette (7) can be moved to the loading completion position as shown in FIG.

When the loading is completed, the motor is automatically stopped by a loading completion detection switch provided at an appropriate place or a load acting on the loading motor at the loading completion position.

Unloading operation First lever (2) from the loading completed state in FIG.
Rotates clockwise, and the cassette holder (5) moves in the unloading direction.

The second lever (3) is rotated counterclockwise by the cam (23) of the first lever (2), and the auxiliary lever (4) on the second lever (3) is also rotated counterclockwise so that the door is closed. The opening / closing shaft (65) of (6) is lifted and the door (6) is opened halfway against the first spring (63).

This is because the second spring (43) for urging the auxiliary lever (4) relatively counterclockwise with respect to the second lever (3) urges the door (6) in the closing direction. 63), the auxiliary lever (4) moves against the first spring (63) against the second
This is because it rotates in the counterclockwise direction together with the lever (3).

The door (6) is forcibly opened by the cassette (7) that is ejected when the door (6) is in the half-opened state. When unloading is completed as shown in FIG. 1 and the cassette (7) is taken out, the timer keeps the door (6) open for a predetermined time, and if the next cassette (7) is loaded during that time. , The loading motor rotates, the first lever (2) rotates counterclockwise, and the pressing peak surface (2
4) disengages from the first contact part (31) of the second lever (3),
The clockwise rotation of the second lever (3) is allowed.

 The door (6) is closed by the urging force of the first spring (65).

When the door (6) is closed, the opening / closing shaft (6
The auxiliary lever (4) engaged with 5) receives a force in the clockwise direction, the auxiliary lever (4) rotates in the clockwise direction together with the second lever (3), and the hook portion (1) of the first lever (2) 26) second
The second contact portion (32) of the lever (3) is engaged, the counterclockwise rotation of the first lever (2) is blocked, an overload acts on the loading motor, and the loading motor stops.

The above state is the standby state of the holder (5) described first. Since the loading device can be stopped at the intermediate position until the loading completion state shown in FIG. 3 is reached, the operation time of the loading device for loading the next cassette can be shortened.

When the cassette (7) is loaded while the door (6) in FIG. 1 is open, the cassette (7) is carried to the loading completion position as described above.

Next, the operation of the loading device when manually passing through the door (6) will be described for the case where the magnetic recording / reproducing apparatus is energized and the case where the energization is cut off.

When energized When the door (6) shown in Fig. 1 is opened and the door (6) is rotated in the closing direction (counterclockwise direction in the drawing), the pressing portion (66) of the door (6) causes the cassette holder to move. The short shaft (51) on the door (6) side of (5) is pressed to retract the cassette (7).

As a result, the link plate (27) connecting the cassette (7) and the first lever (2) is also retracted, the loading start switch (81) is turned on, and the normal loading operation is performed. Holder (5), first,
The second levers (2) and (3) and the auxiliary lever (4) stop at the standby position shown in FIG.

When the door (6) in Fig. 1 is opened and the door (6) is rotated in the closing direction when the door is not energized, the auxiliary lever (4) and the second lever ( A force to rotate clockwise is applied to 3).

The second lever (3) abuts on the pressing surface (24) of the cam (23) of the first lever (2) and is prevented from rotating clockwise, and only the auxiliary lever (4) is placed on the second lever (3). Rotate clockwise.

Since the auxiliary lever (4) is only biased in the counterclockwise direction on the second lever (3) by the second spring (43) with respect to the lever, the second lever (3) ), The auxiliary lever (4) rotates clockwise,
There is no problem in closing the door (6) (Fig. 4).

Further, when the door (6) is closed, the opening / closing shaft (65) of the door (6) is engaged with the lock portion (9) formed on the auxiliary lever (4) to close the door (6). Then, the auxiliary lever (4) is pressed against each other and the closed state of the door (6) is maintained.

By the rotation of the door (6), the pressing portion (66) presses the short shaft (52) to slightly move the link plate (27), and the loading start switch (81) is temporarily moved, as in the case of energization. When the door (6) is closed, the short shaft (52) is disengaged from the pressing portion (66), and the loading start switch (81) is also returned to its original state.

Manually from the state where the door (6) is closed as shown in Fig. 4,
When the power switch is operated, the loading motor operates, the first lever (2) rotates in the loading direction, and following this, the second lever (3) rotates in the clockwise direction. As a result, the opening / closing shaft (65) of the door (6) is disengaged from the lock portion (9) of the auxiliary lever (4) and fitted into the guide groove (41) to unlock the closed state of the door (6).

The first lever (2), the second lever (3) and the auxiliary lever (4) stop in the standby state shown in FIG.

The system control circuit for executing the above-mentioned operation will be described below with reference to the circuit diagram of FIG. 9 and the flowchart of FIG. First, the microcomputer (94) that executes the syscon operation outputs the output of the loading start switch (81) in addition to the outputs of the open switch (OP) and the close switch (CL) that are closed by operating the open button and the close button. 1 The output of the mode detection means (90) for detecting the rotational position of the lever (2) to detect the mode, and the cassette holder (5) at the unloading position.
The output of the cassette detecting means (71) configured by a photocoupler for detecting the mounting of the cassette is input through the notch provided in the. Microcomputers (94)
Forms and derives the control output of the loading motor (92), and the load detection means (91) detects the overload of the loading motor (92).

Therefore, first, when the power is turned on, the reset means (93) resets the microcomputer (94). Next, the output of the mode detection means (90) is detected to determine the mode.

If the result of the mode determination is that it is the standby mode, the open switch (OP) is operated by operating the open button.
Is closed, and the loading motor (92) is reversed to enter the unloading mode. This unloading mode ends when the output of the load detecting means (9) is generated, and the door (6) is opened to realize the unloading mode (FIG. 1) in which the cassette can be mounted.

When the mode is determined to be the unloading mode, it is determined based on the output of the cassette detecting means (71) that the cassette is not loaded, and the loading start switch (81) is activated. It is determined that the closing switch (CL) is not operating by operating the close button, and that the time limit means (95) in the microcomputer (94) is not counting 20 seconds. , The above-mentioned four kinds of discrimination are continuously repeated. Therefore, when the close button is operated, the door (6) is closed, or the door (6) is kept open for 20 seconds, the loading motor (92) rotates normally. In this forward rotation, the second contact portion (32) and the hanging portion (26) are engaged with each other to detect the load (9
It ends when the output of 1) occurs.

However, when it is determined that the cassette is mounted, the unloading mode is maintained until the cassette is pushed in, the loading start switch (81) is operated, and the close button is operated. When the loading start switch (81) is actuated or the close button is operated, the close switch (C
L) is closed, the loading motor (92) is normally rotated, and the cassette holder (5) is moved together with the cassette (7) to the cassette mounting position (loading position). When the cassette holder (5) reaches the loading position, the rotation of the loading motor (92) is restricted, and the load detecting means (91) outputs an output to load the motor (9).
The rotation of 2) is stopped and the loading mode is realized.

Further, when the loading mode is determined as a result of the mode determination, the loading mode is connected until the open button is operated. When the open button is operated and the open switch (OP) is operated, the loading motor (92) rotates in the reverse direction to enter the unloading mode. The driving of the loading motor (92) is stopped in response to the output of the load detecting means (91).

In the unloading mode in which the cassette (7) is ejected, the extraction determination of the cassette (7) and the close button operation are performed. When the close button is operated, the loading mode is entered, and when the cassette is extracted, It falls into the unloading mode without the cassette.

In the above-described embodiment, the overload of the loading motor is detected by mechanically stopping each position of the cassette holder (5) to set each mode. It goes without saying that instead of providing it, the rotational position of the first lever (2) may be detected by the mode detecting means (90).

Further, the lock portion (9) for locking the door (6) is not limited to being formed on the auxiliary lever (4) as described above, and for example, the cutout portion formed on the end plate (60) of the door (6). The short shaft (51) at the front of the holder (5) may be engaged with (67).

The present invention is not limited to the configuration of the above embodiment, and it is needless to say that various modifications can be made within the scope of the claims.

(G) Effect of the Invention According to the present invention, after a certain period of time elapses after the door is opened, the door is closed so that dust does not enter, and the cassette holder is mechanically or electrically stopped sufficiently before the loading position. As a result, the recovery to the unloading state becomes faster, and the effect is great.

[Brief description of drawings]

FIG. 1 is a side view of the loading device in an unloading state, FIG. 2 is a side view of the loading device in a state in which a door is closed, FIG. 3 is a sectional view of the loading device in a loading completed state, and FIG. Sometimes a side view of the loading device with the door manually closed, FIG. 5 is a plan view of the loading device, FIG. 6 is a perspective view of the door, and FIG. 7 is a side view showing a mounting state of the second lever and the auxiliary lever. FIG. 8 and FIG. 8 are plan views of the same as above, FIG. 9 is a mode setting circuit diagram, and FIG. (6) …… door, (5) …… cassette holder, (95) ……
Timed circuit, (72) ... Cassette detection means.

Claims (1)

[Claims] 1. A cassette holder for loading a cassette is guided between two positions, a loading position and an unloading position, and a door is opened and closed in conjunction with a reciprocating operation of the cassette holder near the unloading position. In a cassette loading mechanism that regulates the door to the open position at the unloading position, cassette detecting means for detecting that no cassette is mounted on the cassette holder at the unloading position; A time limiter for counting the non-mounting detection period of the cassette based on the output, and a position where the cassette holder is moved in the loading direction based on the output of the time limiter and the door is closed from the loading position. And a means for stopping the cassette holder at the standby position in the front. Door closing mechanism of set loading mechanism.