JPH0192952A - Cassette loading device - Google Patents

Abstract

PURPOSE:To obtain a loading device for a handy VTR while being further miniaturized by making a reel chassis closer to a head cylinder than the case at the play mode when no cassette is loaded. CONSTITUTION:A reel chassis 4 is projected from a main chassis 1 and at a halt in the 1st stop position S1 in the standby mode. When a cassette 9 is loaded to the reel chassis 4, the reel chassis is stopped at the 2nd halt position S2 to attain recording or reproduction. The reel chassis 4 is forwarded further and in the half at the 3rd stop position S3 in the idle state where no cassette 9 is loaded to the reel chassis 4. Thus, the minimum depth of the loading device is decreased without a limit of the depth of the cassette. When the minimum depth of the loading device is decreased, the minimum depth of the VTR is decreased to offer the portable application.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cassette loading device for a small magnetic recording/reproducing device such as an 8-wheel 11VTR.

(Prior Art) As shown in Figure 1B and Figure 1C5, a cassette loading device has been proposed that can increase or decrease the depth of a VTR depending on the mode (Japanese Patent Laid-Open No. 61-271
No. 648).

The loading device includes a supply reel stand (43) on a main chassis (1) having a head cylinder (14).
and a reel chassis (4) equipped with a take-up reel stand (44).
) is arranged in a slidable manner.

In the eject mode shown in Figure 1 and the standby mode shown in Figure 1 C (the state in which the cassette holder (15) has been lowered onto the reel chassis (4) from the eject mode state), a part of the reel chassis (4) is the main Chassis (1
), and when the holder (15) descends due to the transition from eject mode to standby mode, the exposed tape part of the cassette loaded in the holder collides with the head cylinder (14) on the main chassis (1). is prevented.

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

(Problem to be Solved) In the above loading device, the minimum depth of the device is limited by the cassette dimensions. For example, in an 8-VTR, when a head cylinder (14) with an outer diameter of 27 mm is used,
In fact, the minimum depth of the loading device has been limited to approximately 85 mm.

In VTRs, the dimensions of the cassette and the outer diameter of the cylinder (14) are determined by standards or conformance, making it difficult to make the loading device extremely small.

(Means for solving the problem) Since it is essential to load the cassette into the loading device during recording or playback, the minimum depth of the loading device is no longer restricted by the depth of the cassette. However, currently, even when the cassette is removed, the minimum depth of the loading device is the same as when the cassette is loaded. The applicant found that there was room for improvement in this point, and when the cassette was not loaded, the reel chassis (
4) is brought closer to the head cylinder (14) side, thereby revealing a VTR loading device that is more compact and portable than the conventional one.

In the loading device of the present invention, the reel chassis (4) is at a first stop position Sl in standby mode, a second stop position S2 in play mode which is closer to the head cylinder (14) than the first stop position, and a second stop position S1 in the play mode, which is closer to the head cylinder (14) than the first stop position. 2 Empty mode (which is closer to the head cylinder (14) than the stop position)
It is configured to be able to stop at at least three positions including a third stop position S (a mode in which no cassette is loaded) and a third stop position S.

(Function and Effect) In the standby mode shown in Fig. 1C, the reel chassis (4
) protrudes from the main chassis (1) and reaches the first stop position S.
It is stopped at 1.

Cassette loading is started, and the reel chassis (4) advances toward the head cylinder (14) as before.

When the cassette (9) is loaded in the reel chassis (4), the second stop position S shown in the loop mode in FIG.
The reel chassis (which stops at 2 and performs recording or playback)
When the reel chassis (4) is in an empty state with no cassette (9) loaded therein, the reel chassis (4) moves further forward and stops at the third stop position S, as shown in the empty mode in FIG.

In the empty mode, the depth of the loading device is not limited by the depth dimension of the cassette, and the minimum depth of the loading device can be made smaller than that of the conventional method.

As the minimum depth length of the loading device decreases, V
The minimum depth dimension of the TR can be reduced, making it convenient to carry.

(Example) The present invention will be specifically described below based on an example of 8II@VTR.

The cassette loading device changes into four modes: empty mode, play mode, standby mode, and eject mode, depending on the slide stop position of the reel chassis (4) and the state of the cassette holder (15).

In the eject mode shown in the first diagram, the reel chassis (
4) protrudes from the main chassis (1) and stops at the first stop position S1, and the cassette holder (15) is in a raised state.

The standby mode shown in FIG. 1C is a state in which the cassette size (15) is lowered and locked to the reel chassis (4).

In the play mode shown in FIG. 1B, the reel chassis (4) moves from the standby mode to the head cylinder (14).
It is in a state where it moves to the side and stands still at the second stop position S2.

Recording or playback is performed in play mode.

In the empty mode shown in FIG. 1A, when the cassette holder is empty, the reel chassis (4) moves further toward the head cylinder (14) than in the play mode and comes to rest at the third stop position S. state.

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

In the example, the depth length of the loading device in the standby mode of FIG. 1 C5 and FIG. 3 is 103 m1e, and the depth length L2 of the loading device in the play mode of FIGS.
7mm, the depth length in the empty mode in Figures 1A and 5 is 67-, and the depth in the first position is 67-mm compared to the standby mode.
In the play mode of Figure B, the depth of the cassette loading device is reduced by 16-1 points, and in the empty mode it is reduced by 36e*.

As shown in Figure 2, the cassette loading device includes a rectangular main chassis (1), a reel chassis (4) slidably disposed on the main chassis, and a subchassis (5) slidably disposed between the two chassis. )have.

The main chassis (1) has a head cylinder (14), and a tape loading device (2) is installed near the head cylinder.
, the capstan (
16) is - deployed.

As shown in FIGS. 11, 12, and 13, the tape loading device (2) surrounds the lower part of the head cylinder (14) and loads two ring-shaped gears (3) and (31) into upper and lower positions.
The upper ring-shaped gear (3
) is provided with a tape leading guide (32) on the tape supply side, and a tape leading guide (34) on the tape winding side is provided with the lower ring gear (31).

The leading guide (32) on the supply side is attached to the ring gear (3) (31) via a lever (35),
As is well known, a spring (33) is connected to 35) which biases the leading guide (32) against the positioning stopper (36) on the main chassis (1) when tape loading is completed.

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

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

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

The upper gear (22a) of the second gear (22) is connected to the third gear (22a).
3) The lower gear (23b) of the third gear (23) is connected to the upper gear (23m) of the fourth gear (24).
) are meshed with each other.

The upper gear (24a) of the fourth gear (24) is the fifth gear (24a).
5) The upper gear (25m) meshes with the upper ring gear (3) (31), and the lower gear (25b) of the fifth gear (25) meshes with the lower ring gear (31). are doing.

1st gear to 4th gear (21) (22) (23) (
24), the upper gear and lower gear rotate together, but the fifth gear
The gear (25) is an upper gear (25m) and a lower gear (25b).
) are rotatably supported concentrically independently of each other, and are connected by a torsion spring (28).

The upper gear (21a) of the first gear (21) and the lower gear (22b) of the second gear (22) that meshes with the first gear (21a) are not full-circumference gears, and the upper gear (21m) has a part with a tip circle radius. The lower gear (22b) has a small diameter arc part (22c) with a radius of the root circle.

In the standby mode of Fig. 11, the first gear (21)
When 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 supply side leading guide (32) also rotates clockwise.

The lower ring gear (31) rotates counterclockwise, and the leading guide (34) on the tape winding side also rotates counterclockwise, and as shown in Figure 12, both leading guides are connected to the main chassis. The tape is positioned by hitting the stoppers (36) and (32), and the tape loading is completed.

At this time, the upper gear (25 m) of the fifth gear (25) rotates overrun, and the leading guide (34) is positioned by the stopper (37) by the deflection of the torsion spring (28).
Press and energize.

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) (22
The small diameter arc portion (22c) of b) faces the first gear (21
) idles and does not transmit rotational force to the gears after the second gear (22).

In the play mode shown in Figure 12, the supply side leading guide (3
Both ring-shaped gears (3) A force acts on the gear (31) in the tape unloading direction, and the second gear (22) receives a clockwise rotational force.

However, as described above, the large-diameter arc portion (21c) of the upper gear of the first gear (21) and the small-diameter arc portion (22c) of the lower gear of the second gear (22) correspond to each other. ) is prevented from rotating clockwise.

When unloading the tape, the loading motor (
26) is reversed, the first gear (21) rotates counterclockwise, and the upper gear (21a) of the first gear (21) and the lower gear (22b) of the second gear (22) mesh again. The ring gears (3) and (31) are reversely rotated through the intermediate gear train (20), and as shown in FIG. 11, the leading guides (32) and (34)
It returns it to its original position.

What is important about the tape loading device (2) is that even after tape loading is completed, there is no problem in the rotation of the loading motor (26) and the worm (27).

The ohm (27) is connected to the reel chassis (4) as described below.
After tape loading is completed, the reel chassis (4
) can be slid.

As shown in Figure 2, the main chassis (1) has four sides bent upward to form short wall plates, and both side walls (
11) A guide bar (13) (13) is provided on (11).

A reel chassis (4) is arranged on the main chassis (1) so as to be able to approach and separate from the head cylinder (14).

The reel chassis (4) bends both sides of the bottom plate (41) upward to form side plates (42).
), and the guide members (46) are connected to the guide bar (46) of the main chassis (1).
13) Slidably engaged with (13).

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) are provided on the bottom plate (41). ) and a supply side tape pull-out lever (7) are arranged so as to be rotatable in a plane parallel to the bottom plate (41).

The bottom plate (41) is largely restricted on the back side on the head cylinder (14) side, so that even if the reel chassis (4) moves forward toward the head cylinder (14) and both chassis (4) and (14) overlap, the reel will not move. The chassis (4) does not collide with the head cylinder (14).

As shown in FIGS. 2 and 13, the tape loading device is provided on the lower surface of the bottom plate (41)! (2) Worm (27)
A rack plate (48) is provided protrudingly to engage with the worm (2).
7), the reel chassis (4) approaches and moves away from the head cylinder (14).

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) consists of a front plate (51), side plates (53) (53 )
and a bottom plate (5) connecting the front plate (51) and both side plates (53).
2). The bottom plate (52) is largely cut apart except for both ends.

The guide arm (54) is provided on both side plates (53) of the sub-chassis (5), and the guide arm (54) is provided with a roller (54) protruding from the side panel (4Z) of the reel chassis (4).
45) is fitted into the transferable hole, and the guide shaft (55) protruding from the bottom plate (52) of the sub-chassis (5) is inserted into the guide slot (55) formed in the bottom plate (41) of the reel chassis (4).
4)) and is slidably fitted into the subchassis (5).
is capable of sliding on the reel chassis (4) in the same direction as the sliding direction of the reel chassis (4), regardless of the slide of the reel chassis (4).

A cassette detection switch (56) is provided on the top surface of the bottom plate (52) of the sub-chassis (5), and the switch (56) is located in the front notch (4) of the bottom plate (41) of the reel chassis (4).
9) and emerges onto the reel chassis (4).

A spring (57) that biases 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 controlled by the spring. (57) and a sub-chassis drive lever (8) rotatably disposed on the bottom surface of the reel chassis (4).

The drive lever (8) has a downward abutting piece (81) at one end and a protruding abutting claw (82) at the other end. The main chassis (1) and the sub-chassis are only partially represented by the two-dot chain line), and the contact piece (81) is the main chassis (
1), and the contact claw (82) is brought into contact with the rear end surface of the bottom plate (52) of the sub-chassis (5).

As mentioned above, the sub-chassis (5) is always urged toward the head cylinder (14) by the spring (57) and applies a clockwise rotational force to the drive lever (8). The contact piece (81) is in contact with the inner surface of the front wall (10) of the main chassis (1), and clockwise rotation is prevented. Therefore, in the eject mode shown in FIG. It is locked in the state where it protrudes to the maximum from >.

As shown in Figures 2 and 14, the pinch roller lever (6) and the pressure lever (62) are coaxially located on the upper right side of the bottom plate (41) of the reel chassis (4) and can freely rotate independently of each other's rotation. It is pivotally supported.

A pinch roller (61) is provided to protrude upward from the free end of the pinch roller lever (6) on the head cylinder side.

The free end of the crimp lever (62) has a cam roller (
68) is provided protrudingly, and the cam roller is connected to the main chassis (1
) is removably engaged with a cam groove (67) formed in the cam groove (67).

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

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

A shaft (65) on which the tape is hooked is protruded from the free end of the pull-out lever (64).

A supply side tape pull-out lever (7) is provided on the left side of the bottom plate (41) of the reel chassis (4), and this lever is connected to the first
As shown in Figure 5, a cam roller (73) is biased counterclockwise by a spring (73) and protrudes downward near the center of rotation.
2) into the cam groove (74) formed on the main chassis (1).
) is slidably fitted.

A shaft (71) on which the tape is hooked is protruded from the free part of the drawer lever (7).

As shown in Figure 6, there is a switch (2) near the loading motor (26) on the main chassis that stops the motor.
8) and a switch lever (29) that operates the switch.
) are deployed.

When the reel chassis (4) reaches the second stop position S2 in the play mode with the cassette loaded on the reel chassis (4), the switch (28) switches the cassette (9) to the switch lever (29). ) and switch (
29) to stop the loading motor (26).

When the reel chassis (4) is empty, the reel chassis (4)
) reaches the third stop position S in empty mode,
The reel chassis (4) operates the switch lever (29) to turn off the switch.

Next, the operation of the loading device will be described with respect to a case where the cassette (9) is loaded on the reel chassis (4) and a case where the cassette (9) is empty.

Set the holder (15) in the first eject mode.
Insert the cassette (9) into the machine and lower the holder (15) onto the reel chassis (4).

The holder (15) is locked onto the reel chassis (4) by a locking means (not shown), and the cassette detection switch (56) operates to rotate the loading motor (26), as shown in FIG. 7, 8, and 9, the worm (27), intermediate gear train (2)
0), both leading guides (32) (34) are connected to the cassette tape (not shown) via ring gears (3) (31>).
Tape loading is carried out by making approximately half a turn around the head cylinder (14) while pulling out the tape.

Simultaneously with the above operation, the reel chassis (4) is slid by the worm (27) toward the head cylinder (14), the reel chassis (4) slides to the second stop position S2 in the play mode, and the cassette (9 ) hits the switch lever (29) and 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--.

While the reel chassis (4) moves forward, the cam roller (68) of the crimp 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 pinch roller lever (6) is rotated in the same direction via the spring (63), and the tape is pressed against the capstan (16).

The take-up tape is pivotally supported on the pressure lever (62) by the rotation of the pressure lever (62) and the pinch roller lever (6), and is pivotally connected to the pinch roller lever (6) by a connecting plate (66). The drawer lever (64) also rotates clockwise to pull out the tape.

The supply side tape drawer lever (7) is connected to the reel chassis (
4), the cam roller (72) of the lever (7)
) rotates counterclockwise in correspondence with the cam groove (74) on the main chassis (1) to pull out the tape.

As shown from the standby mode in Figure 6 to the play mode in Figure 9, the reel chassis (4) is connected to the head cylinder (1).
4), the rotation center of the sub-chassis drive lever (8) pivotally supported on the chassis also moves to the head cylinders (14) (111), so the drive lever (8) moves clockwise. is allowed and the subchassis (5
) can move forward relative to the reel chassis (4). However, as shown in Figure 4, the front plate (51) of the sub-chassis (5) is in contact with the front of the cassette (9), so the sub-chassis (5) cannot slide relative to the reel chassis (4). , moves together with the reel chassis (4).

1. When the reel chassis is in the position, as mentioned above, tape loading and cassette loading are started simultaneously from the standby mode shown in FIG. Moving.

As described above, the sub-chassis drive lever (8) is allowed to rotate clockwise, the sub-chassis (5) is unlocked, and the biasing force of the spring (57) causes the sub-chassis (5) to move toward the reel chassis (4). ) moves forward relative to the reel chassis regardless of the forward movement of the reel.

The reel chassis (4) and the sub-chassis (5) move forward beyond the second stop position S2 in the play mode of FIG. 1B,
The reel chassis (4) hits the switch lever (29), 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) due to the shape of the cam groove (67), thereby preventing the pinch roller (61) from being deformed by pressure.

Figure 1 C1 From standby mode in Figures 3 and 6 to 1
The amount of advance of the reel chassis (4) to the empty mode in Figures A, 5, and 10 is 20-, and the amount of advance of the sub-chassis (5
) with respect to the reel chassis (4) is 16m, and the depth of the cassette loading device in empty mode is 36m compared to that in standby mode.
becomes smaller.

Note that tape loading is completed when the reel chassis (4) reaches the second stop position S2 in the play mode, and from this state the loading mode further rotates.
Even if the reel chassis (4) is moved forward, as described above, the large diameter arc portion (2) of the first gear (21) of the intermediate gear train (20)
1e) and the small diameter arc portion (22c) of the second gear (22), the rotational force of the loading motor (26) is not transmitted to the leading guide (32) (34), and the leading guide is connected to the reel chassis ( The reel chassis (4) remains stopped at the loading completion position away from the reel chassis (4), and there is no hindrance to the forward movement of the reel chassis (4).

When the eject mode is selected by operating an external switch (not shown), the loading motor (26) is reversed, tape unloading and cassette unloading are started simultaneously, and the reel chassis (4) is separated from the head cylinder (14). Then, it reaches the first standby mode stop position S+4 and stops.

While the reel chassis (4) is retracting, the contact piece (81) of the sub-chassis drive lever (8) hits the main chassis (1).
The drive lever (8) rotates counterclockwise against the spring (57).

As a result, the abutment claw (82) of the lever presses the sub-chassis (5) in the backward direction, causing the chassis to move backward relative to the reel chassis (4), resulting in the standby state shown in FIGS. 3 and 6. to be restored.

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

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

In a structure in which only the reel chassis (4) slides without the sub-chassis (5), the main chassis (1) and the reel chassis (4) slide in standby mode.
Parts with small overlaps, thick walls, and thick shafts must be used to maintain the strength of the mechanism, which adds weight.

According to the present invention, the number of modes can be increased depending on the necessity of mechanical operation of the loading device, and the reel chassis can be stopped at three or more positions, and various modifications can be made within the scope of the claims. Deformation is possible.

[Brief explanation of the drawing]

Figure 1A is a slope view of the empty mode of the VTR, Figure 1B is a slope view of the play mode of the same as above, Figure 1C is a slope view of the standby mode of the same as the above, and Figure 1 is a slope view of the same as the above eject mode. , Fig. 2 is an exploded perspective view of the loading device, Fig. 3 is a plan view of the loading device in standby mode and eject mode, Fig. 4 is a plan view of the same as above in play mode, and Fig. 5 is a plan view of the same as above in empty mode. Fig. 6 is a plan view of the subchassis (5) for the head cylinder in standby mode and empty mode.
FIGS. 7 and 8 are plan views showing the positional relationship of the subchassis to the head cylinder during cassette loading and tape loading, and FIGS.
10 is a plan view showing the positional relationship of the sub-chassis to the head cylinder in play mode, FIG. 10 is a plan view showing the positional relationship to the head cylinder in 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, Fig. 14 is a slope view of the pinch roller lever (6), and Fig. 15 is a plan view of the tape pull-out lever on the supply side. be. (1) Main chassis (14) Head cylinder (2) Tape loading device (4) Reel chassis (5) Sub chassis (6) Vinci roller lever Fig. 1 P No. 9 B E River Fig.

Claims (2)

[Claims] (1) Cassette loading in which a reel chassis (4) equipped with a supply reel stand (43) and a take-up reel stand (44) is slidably disposed on a main chassis (1) equipped with a head cylinder (14). In the device, the reel chassis (4) is in the first stop position S_ in standby mode.
1. A second stop position S_2 in play mode that is closer to the head cylinder (14) than the first stop position, and an empty mode (when the cassette is loaded) that is closer to the head cylinder (14) than the second stop position. A cassette loading device that can be stopped at at least three third stop positions S_3 in a mode in which the cassette is not loaded. (2) The cassette loading device according to claim 1, wherein the reel chassis (4) substantially overlaps the main chassis (1) at the third stop position S_3.