JPH01105356A - Cassette loading mechanism - Google Patents

Abstract

PURPOSE:To make the sliding stroke of a reel Chassis smaller by constituting a loading mechanism with the 3-layer construction of a reel Chassis, which is slidable in respect of a main Chassis, and a sub-Chassis. CONSTITUTION:A reel Chassis 4 is slidably provided in respect of a main Chassis provided with a supporting reel stand 43 and a winding reel stand 44, and a cassette loading mechanism is constituted of the 3-layer construction, which is slidable in respect of a reel Chassis 4. Further, at a standby mode position, the sub-Chassis 5 is projected from the reel Chassis 1 up to a position to permit the fitting of the cassette, and the reel Chassis 4 is housed to the sub-Chassis 5 at an empty mode position. As this result, the sliding stroke in respect of the main Chassis 1 of the reel Chassis 4 can be made smaller.

Description

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

(B) Prior art As shown in the first diagram of Fig. 1B5 and Fig. 1C1, a cassette loading device has been proposed that can expand or reduce the depth of a VTR depending on the mode (Japanese Patent Application Laid-Open No. 61-2716
No. 48).

The loading device has a supply reel stand (43) on a main chassis (1) equipped with a head cylinder (14).
and a reel chassis (4) equipped with a take-up reel stand (44).
〉 is configured so that it can be slid.

Eject mode in Figure 1 and standby mode in Figure 1C (state in which the cassette holder (15) is lowered to the top of the reel chassis (4) from the Nijief 1-mode state)
In this case, part of the reel chassis (4) is connected to the main chassis (1).
), and when the holder (15) is lowered due to the transition from eject mode to standby mode, the exposed tape part of the fully filled cassette in the holder collides with the \rad cylinder (14) on the main chassis (1). is stopped.

In the PLAY mode in Figure 1B, the reel chassis (4)
slides toward the head cylinder (14), and the head cylinder (14) enters the front opening (91) of the cassette, reducing the depth and length of the cassette loading device, making it convenient to carry.

However, in the L loading device, the minimum depth of the device is limited by the cassette size, for example, 8111 m.
In a VTR, when a head cylinder (14) with an outer diameter of 27mm is used, the minimum depth of the loading device is actually limited to about 85ITI11.

In the 81W1 VTR, the dimensions of the cassette and the outer diameter of the cylinder (14) are determined by standards or conforming to them, making it difficult to miniaturize the loading device.

During recording or playback, it is essential to fill the loading device with a cassette, so it is unavoidable that the minimum depth of the loading device is restricted by the depth of the cassette. However, the minimum depth of the loading device is the same as when loading a cassette.

Therefore, we focused on this point, and when the cassette is not loaded, the reel chassis (
4) is brought closer to the head cylinder (14) side to realize an empty mode, thereby making it possible to create a VTR loading device that is more compact and portable than before.

Problems to be Solved by the Invention By the way, in the prior art (Japanese Patent Laid-Open No. 61-271648), a unique space is provided on the reel chassis to allow loading of the cassette, and the eject position, In other words, in order to slide the reel chassis to a position where it is possible to load and eject a cassette, the slide stroke of the reel chassis must be extremely large, and in this position, the overlap between the main chassis and the main chassis is shortened, and the reel chassis - There was a drawback that it was difficult to ensure sufficient support strength.

(d) Means for Solving the Problems The present invention provides a reel chassis with a sapphire slider attached to the reel chassis, and in standby mode (or eject mode), the subsheet is moved to a position that allows the cassette to be attached.
-The reel chassis is made to protrude from the reel chassis, and in the empty mode, the reel chassis is housed in the sub-chassis.

15 = (e) Effects Since the present invention is constructed as described above, it is possible to reduce the sliding stroke of the reel chassis with respect to the main chassis.

(f) Example The present invention will be specifically explained below based on an example of 8111111 VTR.

The cassette loading device operates in 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), which is supported by the reel chassis (4) so as to be able to move up and down. Change to mode state.

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 holder (15) is lowered and locked to the reel chassis (4).

In the PLAY mode shown in FIG. 1B, the reel chassis (4) is moved from the standby mode to the head cylinder (14).
) side and stopped at the second stop position S2. Recording or playback is performed in the 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 remains stationary at the third stop position S3. It is.

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

In the embodiment, the depth Ll of the loading device in the standby mode of FIG. 1 C1 and FIG. 3 is 103 mm, and the first
Figure B1 Figure 4 (7) Depth length L2 in PLAY mode
The depth length L3 in the empty mode of FIG. 1 A1 and FIG. 5 is 67 mm, and the depth length of the cassette loading device in the PLAY mode of FIG. In empty mode, it becomes 36mm smaller.

As shown in Figure 2, the cassette loading device consists of a rectangular main chassis (1), a reel chassis (4) that is slidably disposed on the main chassis, and a reel chassis (4) that is slidably disposed between the two chassis. It has sapsi (5).

The main chassis (1) has a head cylinder (14), and a tape loading device (2) is located near the head cylinder.
, the capstan (
16) is in place.

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 lead guide (32) on the supply side is attached to the ring gear (3) via the lever (35), and the bar (35)
As is known in the art, a spring (33) is connected thereto which urges the leading guide (32) against a positioning stopper (36) on the main jetty (1) upon completion of tape loading.

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) has a worm (27L) driven by a loading motor (26).
and the first ring gear (3) (31),
Second, third, fourth, and fifth gears (21) <22> (2
3) It is composed of (24) and (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 ohm gear and the ohm (27)
The upper gear (21a) meshes with the lower gear (22b) of the second tooth weight (22).

The upper gear (22a) of the second gear (22>) is connected to the third gear 2.
3) The lower gear (23b) of the third gear (23) is connected to the upper gear (23a) of the fourth gear (24).
) are meshed with each other.

The upper gear (24a) of the fourth gear 24) has the fifth tooth* (
25) meshes with the upper gear (25a) and the upper ring gear (3), and the lower gear (25) of the fifth gear (25).
b) meshes with the lower ring-shaped gear (31).

1st gear to 4th gear (21) (22>(23>(24)
), the upper gear and lower gear rotate together, but in the fifth gear (25), the upper gear (25a) and lower gear (25b) can rotate freely and concentrically and are supported on the torsion spring (281). are connected.

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 all-around gears, and the upper gear (21a) has a part with a tip circle radius. The lower gear (22b) has a small diameter arc part (22c) with a tip radius.

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 in the different direction, and the tape supply side leading guide (32>) also rotates in the clockwise direction.

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 against the stoppers (36) and (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 positioned at the stopper (37) by the deflection of the torsion spring (<281).
> is pressed and biased.

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 (
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. ) can be 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) to return the leading guides (32) and (34) to their original positions as shown in FIG.

What is important in 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 worm (27) is attached to the reel chassis (4) as described below.
Even after tape loading is completed, the reel chassis (4) can be slid and driven while the leading guides (32) and (34) are kept waiting at the tape loading completion position.

As shown in Figure 2, the main chassis (1) has four sides bent upward to form short wall plates, and both side walls (
11) Guide bars (13) (13) are provided at (11).

A reel sharp (4) is disposed on the main chassis (1) so as to be able to approach and separate from the head cylinder (14). In FIG. 2, the cassette boulder (15) supported by the reel chassis (4) so as to be able to rise and fall is not shown.

The reel chassis (4) bends both sides of the bottom plate (41) upward to form side plates (42>(42)), and the bottom plate (41)
A guide member (46) is provided protrudingly on both sides of the main chassis (1), and the guide member (46) is connected to the guide bar (1) of the main chassis (1).
3) is slidably engaged with (13).

The bottom plate (41) is equipped with a supply reel stand (43) and a take-up reel stand (44), and is further equipped with a sub-chassis drive lever (8), a pinch roller lever (6), and an S-side tape pull-out lever (64), which will be described later. ) and a supply-side tape pull-out lever 7) are arranged to be rotatable in a plane parallel to the bottom plate (41).

The bottom plate (41) has a large cutout on the back side on the head cylinder (14) side, and when the reel chassis (4) moves forward toward the head cylinder (14) side, both chassis (4) and (14) overlap. Even if the reel chassis (4) does not collide with the head cylinder (14).

As shown in FIGS. 2 and 13, the tape loading device (2) has a dial (27) on the bottom surface of the bottom plate (41).
A rack plate (48) that meshes with the ohm (2
7), the reel chassis (4> approaches and moves away from the head cylinder (14)).

As shown in Fig. 2, the subchassis (5) is arranged between the main chassis (1) and the reel chassis (4), and the subchassis (5) consists of a front plate (51), side plates (53), (53
) and a bottom plate connecting the front plate (51) and both side plates (53) (
52). The bottom plate (52) is largely split except for both ends.

The guide grooves (54) (54) are provided on both side plates of the sub-chassis (5) (53), and the guide grooves (54)
A roller (45) protruding from the side plate (42) of the reel chassis (4) is removably fitted into the sub-chassis (5).
A guide shaft (55) protruding from the bottom plate (52) of the reel chassis (4) is slidably fitted into a guide slot (47) formed in the bottom cutout (41) of the reel chassis (4). (
5) is capable of sliding the reel chassis (4)l 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 installed in the front notch (4) of the bottom plate (41) of the reel sharp (4).
9) and emerges onto the reel chassis (4).

In addition, the tip of the bottom puncher (52) is inserted into a through hole formed on the bottom of the cassette to lock the reel rotation inside the cassette. A reel lock release piece (200) that comes into contact with the structure and releases the lock is integrally formed.

A spring (57) is connected between the sub-chassis (5) and the reel chassis (4) to bias the sub-chassis (5) toward the head cylinder (14), and the movement of the sub-chassis (5) is It is regulated 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-jersey are only partially represented by the two-dot chain line), and the hit piece (81) is the main chassis (1).
), and the contact claw (82) is in 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 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. ) is locked in the maximum protruding state.

As shown in Figures 2 and 14, the pinch roller lever (6) is attached to the upper right side of the bottom plate (41) of the reel chassis (4), and the bar (62>) is coaxial and freely rotates regardless of the rotation of each other. is supported by.

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).

This cam groove (67) is partially curved, and is caused by engagement with the cam roller (68) while the reel chassis (4) transitions from the state shown in FIG. 1C to the state shown in FIG. 1B. While the crimp lever (62) rotates clockwise and further transitions from the state shown in FIG. 1B to the state shown in FIG. 1A, the crimp lever (62)
2), the pinch roller lever (6) rotates counterclockwise, and the pinch roller <61> moves to the cab stun (16).
The shape is designed so that it is slightly spaced from the

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 bar (64) on the take-up 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).

On the left side of the bottom plate (41) of the reel chassis (4) is a supply (
A tape pull-out lever (7) is provided, which is biased counterclockwise by a spring (73) as shown in FIG.
72) formed on the main chassis (1).
4) is slidably fitted.

A shaft (71) on which the tape is hooked is protruded from the free end 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.
) is rotatably provided on a support shaft (291).

When the cassette is fully loaded on the reel chassis (4), the above switch (28>
) when the reel chassis (4) reaches the second stop position S2 in the PLAY mode, the side of the cassette (9) switches and hits the bar (29) as shown in Fig. 4.
This switch lever rotates counterclockwise to switch (
28) to stop the rotating motor (26).

When the reel chassis (4) is empty, the reel chassis (4)
) reaches the third stop position S3 in the empty mode, the end of the bottom hole (41) of the reel chassis (4) operates the switch /<- (29) as shown in Fig. 5, and the switch (
28) to stop the loading motor (26).

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

Note that the tape (201) is indicated by a chain double-dashed line in FIGS. 6, 7, and 9.

When loading a cassette, press the holder (15) in the first eject mode.
Insert the cassette (9) into the reel chassis (4) and lower the holder (15) onto the reel chassis (4).

The holder (15) is locked onto the beam 4) by a locking means (not shown), and the cassette detection switch (56> is activated to control the loading motor (
26) rotates, and the worm (27) and intermediate gear train (20
), both leading guides (32) and (34) rotate approximately half a circle around the head cylinder (14) while pulling out the cassette tape (not shown) via the ring gears (3) and (31) to load the tape. Let's do it.

At the same time as the above operation, the reel chassis (
4) is slid to the head cylinder (14) side,
The reel chassis (4) slides to the second stop position S2 in the PLAY mode, the cassette (9) hits the switch lever (29), the loading motor (26) stops, and the reel chassis (4) also stops. The amount of movement of the wall chassis (4) during this period is 16 m.

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

A crimping bar (62), a take-up which is pivotally supported on the crimping lever (62) by the rotation of the pinch roller lever (6) and is pivotally connected to the pinch roller lever (6) by a connecting plate (66). The side tape pull-out 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 Fig. 6 to the PLAY mode in Fig. 9, the reel chassis (4) is connected to the head cylinder (
14) side, the rotation center of the sub-chassis drive lever (8) pivotally supported on the chassis also moves to the head cylinder (14) side.
) is allowed to move clockwise, and the sub-chassis (5) can move forward relative to the beam 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) and moves integrally with the reel chassis (4>).

When the reel chassis is empty As described above, tape loading and cassette loading are started simultaneously by the rotation of the loading motor (26) from the standby mode shown in FIG. Moving.

As described above, the sub-chassis drive lever (8) is allowed to rotate clockwise, the lock on the sub-chassis (5) is released, and the biasing force of the spring (57) causes the sub-chassis (5) to move toward the reel chassis. It advances relative to the reel chassis regardless of the advance in (4).

The reel chassis (4) and the sub-chassis (5) move forward beyond the second stop position S2 in the PLAY mode in Fig. 1B, and the reel chassis (4) hits the switch lever (29), causing the loading motor (26> Then, the reel chassis (4) stops.

At this time, the pinch roller lever (6) is slightly separated from the button (61) due to the shape of the cam groove (67),
This prevents deformation of the pinch roller (61) due to pressure.

Figure 1 01 From standby mode in Figures 3 and 6 to 1
Fig. A1 Fig. 5, Fig. 10 work〉・Reel chassis up to butty mode (Advance amount of 4〉 is 20TrWl, sapsi ~
- The amount of advance of the reel chassis (5) relative to the reel chassis (4) is 1
5+nm, the depth of the cassette loading device in empty mode 1° is 36 mm smaller than that in standby mode.

Note that tape loading has been completed when the reel chassis (4) reaches the second stop position S2 in the PLAY mode, and even if the loading motor further rotates from this state and moves the reel chassis (4) forward. , as mentioned above,
The large diameter arc portion of the first gear (21) of the intermediate gear train (20) (
21c) and the small diameter arc of the second gear (22)! (22c), the rotational force of the loading motor (26) is not transmitted to the leading guides (32) and (34), and the leading guide remains stopped at the loading completion position away from the reel chassis (4). Yes, there is no problem with the reel chassis (4) moving forward.

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 stop position S1 in standby mode 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 abutting claw (82) of the lever presses the sub-chassis (5) in the backward direction, causing the chassis to move backward relative to the rail chassis (4), and the standby position shown in FIGS. 3 and 6. restore the condition.

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

As in the above actual journey example, the main chassis (1)
- By disposing the sub-chassis (5) between the main chassis (1) and the sub-chassis (4), the depth and length of the loading device can be increased by the sum of the forward movement of the main chassis (1) and the forward movement of the sub-chassis (5). I can make eight.

In a structure in which only the reel chassis (4) is slid without the sub-chassis (5), in standby mode, the main chassis (1) and the chassis (4)
The overlapping parts are small, and thick, slender parts 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.

(G) Effects of the Invention As described above, according to the present invention, a main chassis, a reel chassis that can be slid with respect to the main chassis,
Since the cassette loading mechanism is made up of a three-piece structure of the sub-chassis that can slide with respect to the reel chassis, the slide stroke of the sub-chassis can be reduced by the amount of the slide stroke of the sub-chassis. Therefore, when the reel chassis protrudes from the main chassis, the overlapping portion between the reel chassis and the main chassis can be set to be large, and it is possible to strengthen the support strength of the reel chassis.

[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, and Fig. 4 is a PLAY view of the same as above.
FIG. 5 is a plan view of the same empty mode as above, and FIG.
), Figures 7 and 8 are plan views showing the positional relationship of the sub-chassis to the head cylinder during cassette loading and data loading, and Figure 9 is a plan view showing the positional relationship of the sub-chassis to the head cylinder in the PLAY mode. FIG. 10 is a plan view showing the positional relationship of the chassis, FIG. 10 is a plan view showing the positional relationship with the head cylinder in empty mode, FIG. 11 is a plan view of the tape loading device, and FIG. 12 is a plan view of the tape loading completed state. 13 is a cross-sectional view of the same as above, FIG. 14 is a perspective view of the pinch roller lever (6), 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)...Subchassis. Figure 5 Figure 6 Figure 7 Figure 8 Figure U Figure Shi

Claims (2)

[Claims] (1) A main chassis including a head cylinder, a supply reel stand and a take-up reel stand, which is slidable with respect to the main chassis and is in standby mode.
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 a second stop position in the PLAY mode that is closer to the head cylinder side than the first stop position;
The third position in the empty mode is closer to the head cylinder than the stop position and substantially overlaps the main chassis.
a reel chassis that can be stopped at at least three stop positions; when a cassette is loaded on the reel chassis, the reel chassis protrudes from the reel chassis to allow loading; when the cassette is not loaded, the reel chassis and a sub-chassis slidably supported by the reel chassis so as to accommodate the reel chassis in conjunction with the slide of the cassette loading mechanism. (2) The sub-chassis is biased in the direction of storing the reel chassis by a biasing means, and a rotating lever, one end of which engages with the sub-chassis and the other end of which engages with the main chassis, moves the reel chassis. The cassette loading mechanism according to claim 1, wherein the cassette loading mechanism is pivotally supported by a chassis and regulates the position of the sub-chassis according to the relative position of the reel chassis with respect to the main chassis.