JPH083933B2 - Cassette loading mechanism - Google Patents

Description

The present invention relates to a cassette loading device for a compact magnetic recording / reproducing apparatus such as an 8 mm VTR.

(B) Prior Art As shown in FIGS. 1B, 1C, and 1D, there has been proposed a cassette loading device capable of expanding and contracting the depth of the VTR according to the mode (Japanese Patent Laid-Open No. 61-61). -271648
issue).

In the loading device, a reel chassis (4) including a supply reel stand (43) and a take-up reel stand (44) is slidably arranged on a main chassis (1) including a head cylinder (14). Composed.

In the eject mode of FIG. 1D and the standby mode of FIG. 1C (the cassette holder (15) is lowered onto the reel chassis (4) from the state of the eject mode), part of the reel chassis (4) is the main chassis. (1)
When the holder (15) descends due to the transition from the eject mode to the standby mode, the exposed portion of the cassette loaded in the holder and the head cylinder (14) on the main chassis (1) are prevented from colliding. It

In the PLAY mode of FIG. 1B, the reel chassis (4) slides toward the head cylinder (14) side, the head cylinder (14) enters the front opening (91) of the cassette, and the depth of the cassette loading device increases. The length can be shortened and it is convenient to carry.

However, in the above loading device, the minimum depth length of the device is restricted by the cassette size. For example, in the case of 8 mm VTR, when the head cylinder (14) with an outer diameter of 27 mm is used,
The minimum depth of the loading device was practically 85 mm.

For 8mm VTR, the cassette size and cylinder (14) outer diameter are
It was difficult to miniaturize the loading device because there were standards or agreements based on it.

Since it is indispensable to fill the loading device with the cassette at the time of recording or reproducing, it is unavoidable that the minimum depth length of the loading device is restricted by the depth dimension of the cassette, but at present, the cassette is removed. Even in the state, the minimum depth length of the loading device is the same as when the cassette is loaded.

Therefore, paying attention to this point, when the cassette is not loaded, by making the reel chassis (4) closer to the head cylinder (14) side than in the PLAY mode, and realizing the empty mode, it is even smaller than the conventional one. A VTR loading device that can be converted and carried can be considered.

(C) Problems to be Solved by the Invention In the prior art (Japanese Patent Laid-Open No. 61-271648), a unique space for allowing loading of a cassette is provided on the reel chassis, and the eject position, that is, the cassette. In order to slide the reel chassis to the position where loading and discharging can be performed, the sliding stroke of the reel chassis becomes extremely large, and at this position, the overlapping part of the main chassis and the reel chassis becomes short, and the supporting strength of the reel chassis is reduced. There was a drawback that it was difficult to secure.

(D) Means for Solving the Problems In the present invention, a sub-chassis is slidably mounted on a reel chassis, and in the standby mode (or eject mode), the sub-chassis is projected from the reel chassis to a position where mounting of a cassette is allowed. In the empty mode, the reel chassis is stored in the sub chassis.

(E) Action Since the present invention is configured as described above, it is possible to reduce the slide stroke of the reel chassis with respect to the main chassis.

(F) Example Hereinafter, the present invention will be specifically described based on an example of 8 mm VTR.

The cassette loading device is a reel chassis (4)
Depending on the slide stop position and the state of the cassette holder (15) which is supported by the reel chassis (4) so as to be able to move up and down, the mode is changed to four modes: empty mode, PLAY mode, standby mode, and eject mode.

Eject mode shown in FIG. 1 D is a state in which the reel chassis (4) is stopped at the first stop position S ₁ projects from the main chassis (1), the cassette holder (15) is increased.

In the standby mode shown in FIG. 1C, the cassette holder (15) is lowered and locked to the reel chassis (4).

The PLAY mode shown in FIG. 1B is a state in which the reel chassis (4) has moved to the head cylinder (14) side from the standby mode state and stopped at the second stop position S ₂ . PLAY
Recording or reproduction is performed in the mode.

In the empty mode shown in FIG. 1A, when the cassette holder is empty, the reel chassis (4) moves further to the head cylinder (14) side than in the PLAY mode, and stands still at the third stop position S ₃ . It is in a state.

In the empty mode, the depth of the loading device and the entire VTR is minimized.

In the embodiment, the depth length L ₁ of the loading device in the standby mode shown in FIGS. 1C and 3 is 103 mm, and the depth length L ₂ in the PLAY mode shown in FIGS. 1B and 4 is 87 mm. 1
The depth length L ₃ in the empty mode of Fig. A and Fig. 5 is 67.
mm, and the depth length of the cassette loading device is 16 mm in the PLAY mode of FIG. 1B compared to the standby mode.
Smaller, 36mm smaller in empty mode.

As shown in FIG. 2, the cassette loading device includes a rectangular main chassis (1), a reel chassis (4) slidably arranged on the main chassis, and a sub-chassis (5) slidably arranged between the chassis. )have.

The main chassis (1) is provided with a head cylinder (14), a tape loading device (2) near the head cylinder, and a capstan (16) on the right rear side of the head cylinder (14).

The tape loading device (2) is shown in FIGS.
As shown in FIG. 13, the lower part of the head cylinder (14) is surrounded and two ring gears (3) and (31) are concentrically rotatably arranged in upper and lower two stages, and the upper ring gear ( 3), the tape leading guide (32) on the tape supply side and the tape leading guide (34) on the tape winding side are arranged on the lower ring gear (31).

The leading guide (32) on the supply side is attached to the ring-shaped gear (3) via the lever (35). As is well known, the leading guide (3) is attached to the lever (35) when the tape loading is completed.
2) to the positioning stopper (3) on the main chassis (1).
A spring (33) for biasing the pressure is connected to 6).

The ring-shaped gears (3) (31) are connected to the loading motor (26) via the intermediate gear train (20).

The intermediate gear train (20) includes a worm (27) driven by a loading motor (26), and first and second worms (27) arranged between the worm (27) and the ring gears (3) (31).
Third, fourth and fifth gears (21) (22) (23) (24)
(25).

As shown in FIG. 13, each of the first to fifth gears has upper and lower two-stage gears, and the lower gear (21) of the first gear (21) is
b) is a worm gear that meshes with the worm (27), and the upper gear (21a) is the lower gear (2) of the second gear (22).
2b).

The upper gear (22a) of the second gear (22) is the third gear (23)
To the upper gear (23a) of the third gear (23)
b) meshes with the lower gear (24b) of the fourth gear (24).

The upper gear (24a) of the fourth gear (24) is the fifth gear (25)
Upper gear (25a) and the upper ring gear (3)
The lower gear (25b) of the fifth gear (25) meshes with the lower ring gear (31).

The first gear to the fourth gear (21) (22) (23) (24) rotate the upper gear and the lower gear integrally, but the fifth gear (25)
The upper gear (25a) and the lower gear (25b) are rotatably and concentrically supported independently of each other and are connected by a torsion spring (281).

The upper gear (21a) of the first gear (21) and the lower gear (22b) of the second gear (22) that meshes with the gear are not full-circle gears, and the upper gear (21a) partially has a tip circle radius. Has a large-diameter circular arc portion (21c), and the lower gear (22b) has a small-diameter circular arc portion (22c) with a radius of the tip circle.

In the standby mode of FIG. 11, when the first gear (21) rotates clockwise, the fourth gear (24) rotates counterclockwise and the fifth gear (25) rotates clockwise. As a result, the upper ring gear (3) rotates clockwise, and the tape feed side leading guide (32) also rotates clockwise.

The lower ring gear (31) rotates counterclockwise,
The leading guide (34) on the tape winding side also rotates counterclockwise, and as shown in FIG. 12, both leading guides are positioned by hitting the stoppers (36) (37) on the main chassis, and the tape loading is completed.

At this time, the upper gear (25a) of the fifth gear (25) overruns and rotates, and the leading guide (34) is pressed and biased against the positioning stopper (37) by the deflection of the torsion spring (281).

Even if the first gear (21) further rotates clockwise from the above state, the large-diameter arc portion (21c) of the upper gear (21a) of the first gear (21) and the lower gear of the second gear (22) The small-diameter circular arc portion (22c) of (22b) faces each other, and the first gear (21) idles,
The rotational force is not transmitted to the gears after the second gear (22).

In the PLAY mode shown in FIG. 12, the supply side leading guide (32)
The ring (3) (3) (3) (3) (3) (3) (3) by the reaction force of the spring (33) for urging the stopper (36) and the torsion spring (281) for urging the winding side leading guide (34) toward the stopper (37).
In 1), a force acts in the tape unloading direction,
The second gear (22) receives a clockwise rotational force.

However, as described above, the large-diameter circular arc portion (21c) of the upper gear of the first gear (21) and the small-diameter circular arc portion (22c) of the lower gear of the second gear (22) correspond to each other and the second gear (22 ) Clockwise rotation is blocked.

During tape unloading, the loading motor (26) rotates in the reverse direction, the first gear (21) rotates counterclockwise, and the upper gear (21a) and the second gear (2) of the first gear (21) are rotated.
2) The lower gear (22b) meshes again. Intermediate gear train (2
The ring gears (3) and (31) rotate in reverse via
As shown in the figure, the leading guides (32) and (34) are returned to their original positions.

What is important in the tape loading device (2) is that the rotation of the loading motor (26) and the worm (27) is not hindered even after the tape loading is completed.

The worm (27) is the reel chassis (4) as described below.
After the tape loading is completed, the reel chassis (4) can be slid while the leading guides (32) and (34) are kept at the tape loading completed position.

As shown in FIG. 2, the main chassis (1) has four side walls bent upward to form short-height wall plates, and guide bars (13) (13) are provided on both side walls (11) (11). Has been deployed.

A reel chassis (4) is provided on the main chassis (1) so that it can approach and separate from the head cylinder (14). In FIG. 2, the cassette holder (15) supported by the reel chassis (4) so as to be able to move up and down is not shown.

In the reel chassis (4), both sides of the bottom plate (41) are bent upward to form side plates (42) (42), and guide members (46) are projectingly provided on both sides of the bottom plate (41). The (46) is slidably engaged with the guide bars (13) and (13) of the main chassis (1).

A supply reel stand (43) and a take-up reel stand (44) are provided on the bottom plate (41), and a sub-chassis drive lever (8), a pinch roller lever (6), and a take-up side tape pull-out lever (64) which will be described later are further provided. ) And supply side tape pull-out lever (7)
Are rotatably arranged in a plane parallel to the bottom plate (41).

The bottom plate (41) has a large recess on the back side of the head cylinder (14) side. The reel chassis (4) advances toward the head cylinder (14) side, and even if both chassis (4) and (14) are overlapped with each other, the reel is reeled. Chassis (4) is head cylinder (14)
Do not collide with.

As shown in FIGS. 2 and 13, a rack plate (48) that meshes with the worm (27) of the tape loading device (2) is provided on the lower surface of the bottom plate (41) so as to rotate the worm (27). Depending on the reel chassis (4) the head cylinder (1
4) approach and separate.

As shown in FIG. 2, a sub chassis (5) is provided between the main chassis (1) and the reel chassis (4), and the sub chassis (5) includes a front plate (51), both side plates (53) (53). ) And a bottom plate (52) connecting the front plate (51) and both side plates (53). The bottom plate (52) is largely hollow except for both ends.

The guide grooves (54) (54) are formed in both side plates (53) (53) of the sub-chassis (5), and the guide grooves (54) project from the side plates (42) of the reel chassis (4). Laura (45)
The bottom plate (52) of the sub chassis (5)
The guide shaft (55) protruding from the reel chassis (4)
It is rotatably fitted in a long guide hole (47) formed in the bottom plate (41) of the sub chassis (5), and the sub chassis (5) is independent of the slide of the reel chassis (4).
The upper part can be slid in the same direction as the sliding direction of the chassis.

A cassette detection switch (56) is provided on the upper surface of the bottom plate (52) of the sub-chassis (5), and the switch (56) passes through the front notch (49) of the bottom plate (41) of the reel chassis (4). And stands on the reel chassis (4).

Further, the bottom plate (52) has a distal end portion inserted into a through hole formed in the bottom surface of the cassette, and comes into contact with a reel rotation lock mechanism inside the cassette so that a reel lock releasing piece (200) for unlocking is integrally formed. Has been formed.

A spring (57) for urging the subchassis (5) toward the head cylinder (14) is connected between the subchassis (5) and the reel chassis (4), and the movement of the subchassis (5) is caused by the spring. (57) and the sub chassis drive lever (8) rotatably provided on the bottom surface of the reel chassis (4).

The drive lever (8) is provided with a downward hitting piece (81) at one end and a hitting claw (82) at the other end so as to project in the eject mode of FIG. 6 (see FIGS. 6 to 10). The main chassis (1) and the sub-chassis are only partially shown by the two-dot chain line), the contact piece (81) contacts the inner surface of the front wall (10) of the main chassis (1), and the contact claw (82) is attached. The bottom plate (52) of the subchassis (5) is applied to the rear end face of the bottom plate (52).

As described above, the sub-chassis (5) is constantly urged to the head cylinder (14) side by the spring (57) to give a clockwise rotational force to the drive lever (8). Since the hitting piece (81) is in contact with the inner surface of the front wall (10) of the main chassis (1), the clockwise rotation is blocked, so that in the eject mode of FIG. 6, the sub-chassis (5) becomes the main chassis (1). ) Is locked in the state that it protrudes to the maximum.

As shown in FIG. 2 and FIG. 14, the pinch roller lever (6) and the pressure bonding lever (62) are coaxially and freely rotatable on the upper right side of the bottom plate (41) of the reel chassis (4) regardless of their mutual rotation. It is pivotally supported.

A pinch roller (61) is provided so as to project upward at the free end of the pinch roller lever (6) on the head cylinder side.

A cam roller (68) is projected downward from the free end of the crimp lever (62), and the cam roller is rollably engaged with a cam groove (67) formed in the main chassis (1).

The cam groove (67) is partially curved, and is engaged with the cam roller (68) during the transition of the reel chassis (4) from the state of FIG. 1C to the state of FIG. 1B. The pinch roller lever (6) moves counterclockwise through the crimping lever (62) while the crimping lever (62) rotates in the clockwise direction and further shifts from the state of FIG. 1B to the state of FIG. 1A. The shape is designed so that the pinch roller (61) is pivoted in the direction and is slightly separated from the capstan (16).

The crimp lever (62) and the pinch roller lever (6) are connected by a spring (63).

The tape pull-out lever (64) on the winding side is attached to the crimp lever (62).
Is pivotally supported, and the lever and the pinch roller lever (6) are pivotally connected by a connecting plate (66).

A shaft (65) for hooking the tape is provided on the free end of the pull-out lever (64) in a protruding manner.

On the left side of the bottom plate (41) of the reel chassis (4), a supply-side tape pull-out lever (7) is provided, and the lever is the 15th.
As shown in the figure, it is biased counterclockwise by the spring (73),
A cam roller (72) protruding downward near the center of rotation is slidably fitted in a cam groove (74) formed on the main chassis (1).

A shaft (71) for hooking the tape is provided on the free end of the pull-out lever (7) in a protruding manner.

As shown in FIG. 6, a switch (2) for stopping the loading motor (26) is provided near the loading motor (26) on the main chassis.
8) and a switch lever (29) for operating the switch
Is rotatably provided on the support shaft (291).

The switch (28) is a loading motor (26) when the cassette is loaded on the reel chassis (4).
Drive reel chassis (4) is the second in PLAY mode
When the stop position S ₂ is reached, the side surface of the cassette (9) contacts the switch lever (29) as shown in FIG. 4, and the switch lever rotates counterclockwise to turn on the switch (28).
Then, the loading motor (26) is stopped.

When the reel chassis (4) is empty, when the chassis (4) reaches the third stop position S ₃ in the empty mode, as shown in FIG. 5, the end portion of the bottom plate (41) of the reel chassis (4). Activates the switch lever (29) to activate the switch (28)
Is turned on and the loading motor (26) is stopped.

Next, the operation of the loading device will be described when the cassette (9) is loaded on the reel chassis (4) and when it is empty.

It is to be noted that the tape (201) is shown by a chain double-dashed line in FIGS. 6, 7, and 9.

When loading a cassette In the eject mode shown in FIG. 1D, the holder (15)
Then, the cassette (9) is put in, and the holder (15) is lowered onto the reel chassis (4).

The holder (15) is locked on the reel chassis (4) by locking means (not shown), and the cassette detection switch (56) operates to load the loading motor (2).
6) rotates, and through the worm (27), the intermediate gear train (20) and the ring-shaped gears (3) and (31) according to the operation sequence of FIG. 6, FIG. 7, FIG. 8 and FIG. Leading guides (32)
(34) pulls out the tape (not shown) of the cassette and makes a half round around the head cylinder (14) to perform tape loading.

Simultaneously with the above operation, the reel chassis (4) is slid toward the head cylinder (14) by the worm (27) and the rack plate (48) meshing with the worm,
The reel chassis (4) slides to the second stop position S _{2 in} PLAY mode, and the cassette (9) moves to the switch lever (29).
At this time, the loading motor (26) stops and the reel chassis (4) also stops. The amount of movement of the reel chassis (4) during this period is 16 mm.

While the reel chassis (4) is moving forward, the cam roller (68) of the crimping lever (62) on the reel chassis (4) moves clockwise in accordance with the shape of the cam groove (67) on the main chassis (1). The tape is rotated and the pinch roller lever (6) is rotated in the same direction via the spring (63) to press the tape onto the capstan (16).

The winding side pivotally supported on the crimping lever (62) and pivotally connected to the pinch roller lever (6) by the connecting plate (66) by the rotation of the crimping lever (62) and the pinching roller lever (6). The tape pull-out lever (64) also rotates clockwise to pull out the tape.

The tape pull-out lever (7) on the supply side moves the cam roller (7) of the lever (7) when the reel chassis (4) moves.
2) Counterclockwise corresponding to the cam groove (74) on the main chassis (1), pull out the tape.

As shown in the standby mode of FIG. 6 to the PLAY mode of FIG. 9, the reel chassis (4) moves to the head cylinder (1
By moving to the 4) side, the rotation center of the sub-chassis drive lever (8) pivotally supported on the chassis also moves to the head cylinder (14) side, so that the drive lever (8) moves clockwise. Allowed, the sub-chassis (5) can move forward relative to the reel chassis (4).
However, as shown in FIG. 4, the front plate (5
Since 1) is in contact with the front surface of the cassette (9), the sub chassis (5) cannot slide relative to the reel chassis (4) and moves integrally with the reel chassis (4).

When the reel chassis is empty As described above, from the standby mode in FIG. 1C, the tape loading and the cassette loading are simultaneously started by the rotation of the loading motor (26), and the reel chassis (4) is moved to the head cylinder (14) side. Moving.

As described above, the clockwise rotation of the sub-chassis drive lever (8) is allowed, the lock on the sub-chassis (5) is released, and the sub-chassis (5) is moved to the reel chassis (4) by the urging force of the spring (57). ) Regardless of the advance of the reel chassis.

The reel chassis (4) and the sub-chassis (5) move forward beyond the second stop position S ₂ in the PLAY mode of FIG. 1B, the reel chassis (4) hits the switch lever (29), and the loading motor (26). Stops and the reel chassis (4) stops.

At this time, the pinch roller lever (6) is slightly separated from the capstan (61) by the shape of the cam groove (67) to prevent the pinch roller (61) from being pressed and deformed.

The advance amount of the reel chassis (4) from the standby mode of FIGS. 1C, 3 and 6 to the empty mode of FIGS. 1A, 5 and 10 is 20 mm, the sub chassis (5).
The amount of advance with respect to the reel chassis (4) is 16 mm, and the depth length of the cassette loading device in the empty mode is 36 mm smaller than that in the standby mode.

The tape loading is completed when the reel chassis (4) reaches the second stop position S ₂ in the PLAY mode, and the loading motor further rotates from this state,
Even if the reel chassis (4) is advanced, as described above, the large-diameter arc portion (21c) of the first gear (21) of the intermediate gear train (20).
The rotation force of the loading motor (26) is not transmitted to the leading guides (32) and (34) due to the opposition of the small gear portion (22c) of the second gear (22) to the leading gear (22). The reel chassis (4) remains stopped at the loading completed position away from the reel, and does not hinder the advance of the reel chassis (4).

When the eject mode is selected by operating an external switch (not shown), the loading motor (26) rotates in the reverse direction, the tape unloading and the cassette unloading start simultaneously, and the reel chassis (4) separates from the head cylinder (14). Then, it reaches the first stop position S ₁ in the standby mode and stops.

While the reel chassis (4) is retracting, the contact piece (81) of the sub-chassis drive lever (8) is moved to the main chassis (1).
Is caught on the inner surface of the front wall (10) of the drive lever (8) and the drive lever (8) rotates counterclockwise against the spring (57).

As a result, the hitting claw (82) of the lever pushes the sub-chassis (5) in the backward direction, and the chassis is relatively retracted with respect to the reel chassis (4), and the standby state shown in FIGS. Return to.

In this state, the lock of the holder is released, and the holder is raised.

As in the above embodiment, by disposing the sub chassis (5) between the main chassis (1) and the reel chassis (4), the amount of advance of the main chassis (1) and the advance of the sub chassis (5). The depth of the loading device can be reduced by the amount added.

Reel chassis (4) without sub-chassis (5)
In the structure that slides only the main chassis (1) and the reel chassis (4) in the standby mode, the overlapping part is small and thick and thick parts are used to maintain the mechanical strength. It has to be added and it is heavy.

According to the present invention, it is possible to increase the number of modes and stop the reel chassis at the above-mentioned three positions or more according to the necessity of mechanical operation of the loading device, and it is possible to set various modes within the scope of the claims. Deformation is possible.

(G) Effect of the Invention As described above, according to the present invention, the cassette has a three-piece structure including a main chassis, a reel chassis slidable with respect to the main chassis, and a sub-chassis slidable with respect to the reel chassis. Since the loading mechanism is configured, the slide stroke of the reel chassis can be reduced by the slide stroke of the sub-chassis. Therefore, when the reel chassis protrudes from the main chassis, the overlap between the reel chassis and the main chassis can be set large. It is possible to enhance the support strength of the reel chassis.

[Brief description of drawings]

Fig. 1A is a perspective view of the VTR empty mode, and Fig. 1B.
Is a perspective view of the same play mode as above, FIG. 1C is a perspective view of the above standby mode, FIG. 1D is a perspective view of the above eject mode, FIG. 2 is an exploded perspective view of the loading device, and FIG. FIG. 4 is a plan view of the loading device in standby mode and eject mode, FIG. 4 is a plan view of the same in PLAY mode, FIG. 5 is a plan view of the same in empty mode, and FIG. 6 is a standby mode and empty mode. 7 is a plan view showing the positional relationship of the sub-chassis (5) with respect to the head cylinder, FIG. 7 and FIG. 8 are plan views showing the positional relationship of the sub-chassis with respect to the head cylinder during cassette loading and tape loading, and FIG. 9 is PLAY. FIG. 10 is a plan view showing the positional relationship of the sub-chassis with respect to the head cylinder in the mode, and FIG. 10 is the head cylinder in the empty mode. FIG. 11 is a plan view of the tape loading device, FIG. 12 is a plan view of the same tape loading completed state, FIG. 13 is a sectional view of the same as above, and FIG. 14 is a pinch roller lever ( 6) is a perspective view and FIG. 15 is a plan view of the supply-side tape pull-out lever. (14) …… Head cylinder, (1) …… Main chassis, (43) …… Supply reel stand, (44) …… Take-up reel stand, (4) …… Reel chassis, (9) …… Cassette,
(5) …… Sub chassis.

Claims (2)

[Claims] 1. A first chassis in a standby mode, comprising a main chassis having a head cylinder, a supply reel base and a take-up reel base slidable with respect to the main chassis.
A stop position, a second stop position in the PLAY mode that is closer to the head cylinder side than the first stop position, and an empty mode that is closer to the head cylinder than the second stop position and substantially overlaps with the main chassis. A reel chassis that can be stopped in at least three positions of the third stop position, and when a cassette is loaded on the reel chassis, the reel chassis projects from the reel chassis to allow the loading, and when the cassette is not loaded, A cassette loading mechanism comprising a sub-chassis slidably supported by the reel chassis so as to accommodate the reel chassis in association with the slide of the reel chassis. 2. A sub-chassis is urged by an urging means in a direction for accommodating the reel chassis, and a rotation lever having one end engaged with the sub-chassis and the other end engaged with the main chassis is provided. The cassette loading mechanism according to claim 1, wherein the cassette loading mechanism is pivotally supported by the reel chassis and regulates the position of the sub chassis according to the relative position of the reel chassis with respect to the main chassis.