JPH0196857A - Mode switching device - Google Patents

Abstract

PURPOSE:To miniaturize a mode switching device and to minimize the loss of power transmitting by driving a tape loading device and a mode switching lever through the use of the rotation of a protrusion piece, which is protruded at a rotor rotated by a motor. CONSTITUTION:A rotor 3 is rotated in an arrow direction by a motor 12, a protrusion piece 31 of the rotor 3 makes a loading lever 4 rotate, and tape loading is started. Synchronously with the rotation of the lever 4, a reel chassis 7 also advances toward the side of a cylinder 11. At the same time, a protruding shaft 602 of a pinch roller lever is pushed to the side of a capstan 14, and a lever 6 rotates and approaches a capstan 16. During this, the protrusion piece 31 escapes from a notch part 51 of a mode switching lever 5 and rotates without touching. When a stopping mode is reached, the protrusion piece 31 invades a relief part 44 of the lever 4 and pushes the lever 5 in a clockwise direction. Further, when the rotor 3 rotates and reaches a pre-mode, the rotor 3 releases a brake through a lever 8. Moreover, by the rotation of the lever 5, a press- contacting lever 62 is rotated, and a tape is sandwiched and pressed between the capstan 14 and a pinch roller 61 through the lever 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mode switching device in a magnetic recording/reproducing device.

(Prior Art) As shown in FIG. 11, a conventional mode switching device of this type uses a positive cam (9) to transmit power to the following three systems.

In the first transmission system, a Geneva gear (92) is engaged with a gear part (91) formed on the outer periphery of a cam (9), and an intermediate gear (9
3) A pair of arcuate loading rings (21) through
(22) is rotationally driven, and the loading ring (21) is rotated.
(22) The tape is pulled out from the cassette (not shown) by the upper tape leading guides (23) and (24) and wound around the head cylinder (11).

The second transmission system includes a drive lever (95) that drives a pinch roller lever (6) to a cam gear (94) on the outside of the cam (9).
) is slidably fitted, and the rotation of the cam (9) rotates the pinch roller lever (6) via the drive lever (95), and the pinch roller (61) is attached to the capstan (14). to press.

The third transmission system is the cam inside the cam! The pin (99) of the mode switching slider (98) is slidably fitted into (97), and the slider (98) moves linearly by the rotation of the cam, and the movement of the slider causes the reel brake release lever in the cassette ( 8), drive the pack tension lever (90), etc.

The release lever (8) has a release bottle (82) projecting upward at its free end, and as shown in FIG.
> The release bottle (82) enters the hole (104) in the brake body (103) disposed between the two reels (101) and (102), and the release lever (8) is rotated clockwise. Due to the movement, the brake body (10
3), and remove the brake pawl (1) protruding from the brake body.
06) is separated from the tooth surface (107) formed on the outer peripheral surface of the reel to release the brake of the reel.
Problems to be Solved) In the above mode switching device, the stroke of the drive lever (95) and the stroke of the slider (98) are controlled by the cam groove (9).
4) This is achieved by changing the curvature of (97), but the cam grooves (94) and (97) must be formed twice on the inside and outside, which increases the diameter of the cam (9) and makes the mechanism smaller. There was a problem. Furthermore, frictional resistance between the cams ffi (94) and (97) and the bottles (96) and (99) caused a power transmission loss, necessitating an increase in the capacity of the motor.

(Means for Solving the Problems) The present invention provides a projection on a rotating body rotated by a motor, and the rotation of the projection drives a tape loading device and a mode switching lever, thereby reducing the size of the mechanism. The purpose of this study is to clarify a mode switching device that can realize the above-mentioned functions and reduce power transmission loss.

The mode switching device of the present invention includes a shaft-shaped protrusion (31) provided at an eccentric position of a rotating body (3) connected to a motor (12),
The loading lever (4) is engageable with the protrusion (31).
and a mode switching lever (5), a tape loading device (2) is connected to the loading lever (4), and a pinch roller lever (5) is installed between the mode switching lever (5) and the capstan (14). The pinch roller lever (6) is pressed against the capstan (14) by the movement of the mode switching lever.

(Operation and Effect) The rotation of the rotating body (3) also rotates the protrusion (31), thereby rotating the loading lever (4) and the mode switching lever (5).

Rotation of the loading lever (4) drives the tape loading device (2) to load the tape, and rotation of the mode switching lever (5) causes the pinch roller lever (6) to move between the capstan (14) and the tape loading device (2). Pressed by

The rotating body (3) only needs to be provided with protrusions (31) at eccentric positions, and the diameter of the rotating body (3) can be made smaller compared to conventional positive cams with multiple cam grooves. Yes, the mechanism can be made compact. Furthermore, compared to the frictional resistance between the conventional positive cam and the pin, the friction between the protruding shaft and the levers (4) and (5) is small, and power transmission loss can be reduced.

(Embodiment) In this embodiment, the depth of the mechanism is shortened when transitioning from the standby mode when the tape cassette (100) shown in Fig. 5 is inserted to the play mode during recording and playback shown in Fig. 6. This is a mode switching device in a VTR.

The VTR has a main chassis (1) equipped with a head cylinder (11) and a mode switching device (2), and a reel chassis (
7) is in place.

As shown in FIG. 1, a tape loading device (2) is provided on the main chassis (1) surrounding a head cylinder (11), and the tape loading device (2) is mounted along the head cylinder (11). It consists of a pair of loading rings (21) (22) rotatably arranged, and tape leading guides (23) (24) arranged in conjunction with each loading ring (21) (22).

Each loading ring (21) (22) has a different running height, and each has a tooth surface (20) formed on its outer periphery.

A rotating body (3) is disposed at the rear left side of the head cylinder (11), and a worm gear (3) rotated by a loading motor (12) is connected to a helical tooth surface (30) formed on the outer periphery of the rotating body (3). 13) are engaged.

The rotating body (3) is suspended and supported by a support stand (16) fixed to the main chassis (1) as shown in Fig. 7.
A shaft-like protrusion (31) is provided to protrude downward at the eccentric position of 3).

There is a rotating body (3) between the rotating body (3) and the main chassis (1).
Loading lever (4) that rotates by rotation of 3)
and a mode switching lever (5) are rotatably provided.

As described later, as the rotating body (3) rotates counterclockwise, both levers (4) and (5) are driven, and the mode changes from standby mode in Figure 1 to stop mode in Figure 2 to play mode in Figure 3. mode, the mode shifts to the rewind 7 rewind play mode shown in FIG.

As shown in FIG. 2, a capstan (14) is disposed on the right side of the head cylinder (11).
) is provided with a pressing lever (65) for pressing the pinch roller lever 6) against the capstan (14),
The pressing lever (65) and the mode switching lever (5) are pivotally connected by a connecting plate (57).

As shown in No. 1I2I, the loading lever (4) is pivotally supported at approximately the center by the support shaft (40), has a sector gear (41) at one free end, and a cam groove (43) at the other free end. There is.

The sector gear (41) is linked to the loading rings (21) and (22) via a gear train (15).

Although only one gear train (15) is shown in the drawing, there are actually two trains, and the final gears of each gear train rotate in opposite directions, and one final gear rotates in the upper loading ring (21).
>, the other final gear is connected to the lower loading ring (2
2), and the double-ended ding rings (21) and (22) are meshed with each other by counterclockwise rotation of the sector gear (41).
The tape leading guide (23) rotates in opposite directions to each other.
(24) is run in the loading direction, and the tape is wound around the head cylinder (11).

The protrusion (31) of the rotating body (3) is slidably fitted into the cam groove (43) of the loading lever (4),
The inner part of the cam groove (43) is an arcuate relief part (44).

When the rotating body (3) rotates counterclockwise and transitions from the standby mode shown in Fig. 1 to the stop mode shown in Fig. 2,
The protrusion (31) of the rotating body (3) is connected to the loading lever (4).
) While sliding on the cam m (43), press the lever to rotate it counterclockwise, and when the stop mode is reached, the protrusion (31) enters the relief part (44).

- In the stop mode, the radial center of the relief part (44) coincides with the rotation center of the rotating body (3), and therefore
) further rotates counterclockwise, the loading lever <4) remains stationary in the stop mode, and the tape leading guides (23) (24) remain stopped at the loading completion position.

As shown in Figure 1, the support shaft (
50), the central part of the mode switching lever (5) is pivotally supported,
The lever is biased counterclockwise by a spring (53) and rests against a stopper (54).

Two notches (51 and 52), first and second, are provided on the head cylinder (11) side of the mode switching lever (5), and in the standby state shown in Fig. 1, the first notch on the free end side The protrusion (31) of the rotating body (3) is located in the portion (51).

When the rotating body (3) rotates counterclockwise, the projection (31)
escapes from the first notch (51) and hits the mode switching lever (5) just before the stop mode shown in FIG. 2, causing the lever to rotate slightly clockwise against the spring (53).

Furthermore, when the rotating body (3) rotates counterclockwise, the rotating body (
The protrusion (31) of 3) fits into the second cutting arrow part (52) of the mode switching lever (5) and rotates the lever clockwise while sliding to shift to the play mode shown in Fig. 3. .

On the way to the play mode, press the loading lever (
The movement of step 4) activates the reel brake release lever (8) in the cassette marked t& to release the reel brake.

As shown in Figure 1, the mode switching lever (5) and the pressing lever (
The connecting plate (57) connecting the connecting plate (57) with the long hole (56) (
56) is opened, a guide shaft (17) protruding from the main chassis (1) is fitted into the long hole (56), and the connecting plate (57) is slidable left and right.

The pressing lever (65) has its central portion pivotally supported by a support shaft (68), and a shaft (58) protruding from the connecting plate (57) is fitted into a notch (69) formed at the free end of the connecting plate. I'm waiting,
At the free end of the capstan (14) side, attach the pinch roller lever (6) in the stop mode position to the capstan <14).
A cam surface (601) that presses toward the side is formed.

The pinch roller lever (6) is pivotally supported by a support shaft (60) protruding from the main chassis (1), and has a pinch roller (61) at its tip. Also, pinch roller lever (6)
A projecting shaft (602) that fits comfortably into a cam hole (75) of a reel chassis (7), which will be described later, is provided at approximately the center of the reel.

A pressure lever (62) is pivotally supported on the support shaft (60) below the pinch roller lever (6).
) and the pinch roller lever (6) are linked by a spring (64).

The crimp lever (62) has a cam surface (
A roller (63) that can come into contact with the roller (601) is pivotally supported.

In addition, there is a pressure lever (65) and a take-up reel stand (7Z) to be described later.
) A reel stand brake lever (33) is disposed between the reel stand brake lever (33), which is biased counterclockwise by a spring (36) about a fulcrum (37), and a hit shaft protruding from the lever (33). (35) is the pressing surface (3) of the pressing lever (61).
8) It hits and stands still. When transitioning from stop mode to play mode, the press lever (65) rotates slightly clockwise to release the pressure on the reel stand brake lever (33), and the reel stand brake (33) releases the pressure on the brake shoe (34). is brought into contact with the take-up reel stand (72).

A long hole (55) is formed at the free end of the connecting plate (57) @ of the mode switching lever (5), and the long hole (55) is long from side to side and has a downwardly enlarged part (56) in the center. are doing.

A brake drive lever (86) is provided above the free end of the mode switching lever (5) and pivoted to the main chassis (1).

As shown in Figure 8, the brake drive lever (86) is connected to the horizontal rod (87).
) has a vertical rod (8) protruding toward the rotating body (3) side.
8) is formed into an inverted T-shape, the right end of the horizontal rod (87) is pivoted to the support shaft <89) on the main chassis (1), and the left end has a shaft (85) protruding downward. It is slidably fitted into the elongated hole (55) of the mode switching lever (5).

At the intersection of the horizontal bar 87) and the vertical bar (88) of the brake drive lever (86), there is a slope (8) that continues to the right side of the vertical bar.
01) is formed.

As shown in FIG. 5, the reel chassis (7) is equipped with a supply reel stand (71) and a take-up reel stand (72), and further behind the supply reel stand (71) is an in-cassette reel brake release lever (8). is arranged in a swingable manner.

The release lever (8) has a long arm (81) extending to the right from the center of rotation (80), and a short arm (83) extending to the left of the take-up reel stands (71, 72). A brake release pin (82) is provided at the tip of the arm (81) to protrude upward.

A shaft (84) is provided at the tip of the short arm (83) to protrude downward, and the shaft (84) passes through a window hole (73) formed in the reel chassis (7), and the standby shown in FIG. In the mode, the shaft body (84) is connected to the brake drive lever.
(86) is in contact with the slope <801).

When the cassette is loaded into the reel chassis (7), the brake body (103
) The pin of the release lever (8) fits into the hole (104).

When the lever rotates clockwise, the brake body (103) moves f&3Ju away from the reel against the spring (105), as shown by the two-dot chain line, and the brake pawl (106) engages the tooth surface ( 107) and release the brake on the reel.

As shown in Figure 5, the reel chassis (7) has a supply reel stand (
A slot (74) is provided in front of the rod 71), into which a drive shaft (42) protruding from the rod in brake bar 4) is slidably fitted.

The slot (74) consists of a horizontally long straight slot (74a) and a relief slot (74b) that extends obliquely upward from the left end of the slot and is curved to match the rotation locus of the drive shaft (42).

From standby mode to loading lever (4) in Figure 5.
) rotates counterclockwise, the lever's drive shaft (4
2) slides from right to left through the straight slot (74a) and presses the reel chassis (7) toward the head cylinder (11). When the stop mode shown in FIG. 6 is reached, the drive shaft (42
) is located at the left end of the diameter slot (74a), and even if the loading lever (4) rotates further clockwise, the drive shaft (
42) does not enter the relief slot <74b) and press the reel chassis (7), and the reel chassis (7) remains stopped.

The right front part of the reel chassis (7) has a cam hole (75) into which the protruding shaft (602) of the pinch roller lever (6) fits.
has been established.

When the reel chassis (7) slides toward the head cylinder, the protruding shaft (75) is pushed by the edge of the cam hole, and the pinch roller rotates clockwise.

However, as shown in FIG. 5, in the standby mode where the slide chassis (7) is separated from the head cylinder (11), the cassette (10) is placed on the slide chassis (7).
0).

As shown by the solid line in FIG. 9, the release pin (82) of the brake release lever (8) has entered the cassette, and the brake body (103) is in the hole (104) when the brake is applied to the reel. Fits in.

The loading motor (12) rotates and the rotating body (3) rotates counterclockwise, and as mentioned above, the protrusion (31) of the rotating body (3) rotates the loading lever (4) counterclockwise. , tape loading begins.

By rotating the loading lever (4) counterclockwise,
The lever chassis (7), which is engaged with the drive shaft (42) of the lever, also moves forward toward the head cylinder (11).

As the reel chassis (7) moves forward, the protruding shaft (602) of the pinch roller lever (6) engaged with the cam hole (75) of the chassis is pressed toward the capstan (14), and the pinch roller lever (6) rotates clockwise and approaches the capstan (14), but at this point the pinch roller (
61) does not contact the capstan (14).

During this time, the protrusion (31) of the rotating body (3) escapes from the first notch (51) of the mode switching lever (5) and rotates without contacting the lever, so the mode switching lever (5) It does not rotate and remains stationary.

When the stop mode shown in FIG. 2 is reached, the protrusion (31) enters the relief part 44 of the loading lever (4>) and hits the mode switching lever (5), causing the lever (5) to
Press slightly clockwise.

When the protrusion (31) enters the relief part (44), the protrusion (3
Even if 1) is further rotated counterclockwise, the loading lever remains stationary. That is, the tape leading guide (23
) (24) remains stopped at the tape loading completion position.

Further, when the rotating body (3) rotates counterclockwise and reaches the play mode shown in Fig. 3, the brake drive lever (86)
is guided by the long hole (55) of the mode switching lever (5) and rotates slightly clockwise. This causes the shaft body (84) of the brake release lever (8) in the cassette to move from the brake drive lever (
86), the brake release lever (8) rotates slightly clockwise, and the brake release pin (82) of the lever releases the brake body (103) against the spring (103). away from the reel and release the brake.

In addition, the clockwise rotation of the mode switching lever (5) causes the connecting plate (57) to slide to the left, thereby causing the pressing lever (65) to rotate clockwise, and the cam surface (67) of the lever to move the connecting plate (57) to the left. Rotate the crimp lever (62) clockwise and press the pinch roller lever (6> towards the capstan (14) side via the spring (64) to close the gap between the capstan (14) and the pinch roller <61). Apply pressure to the tape.

Recording, playback, and fast forward playback are performed in the play mode.

FIG. 4 shows a seven-rewind rewind playback mode in which the rotating body (3) further rotates slightly counterclockwise from the boule-shaped frame.

The pressure lever (65) rotates further clockwise than in the reel mode, and the brake lever (
33) is released and weak braking is applied to the take-up reel stand (72) by the spring force. This causes the tape to be rewound under tension.

When the standby button (not shown) is pressed, the motor (12
) is reversed, and the standby mode shown in FIG. 5 is returned to by an operation opposite to that described above.

In the embodiment, a mode detection switch (94) shown in FIG. 10 is attached to the rotating body (3).

The switch (94) has a triple concentric arc-shaped contact pattern (96a) on the lower surface of a disk (95) that is fixed on the main chassis (1) and covers above the rotating body (3).
(96b) and (96c) are provided, and a brush (97) having three contact pieces (97a), (97b), and (97c) is fixed on the upper surface of the rotating body (3). The rotation angle of the rotating body (3) is detected by selectively touching each contact piece of (97) with each contact pattern of the disk, and the mode is thereby detected, and the loading motor (12) is energized and energized. control necessary operations such as shutting off the

The present invention is not limited to the configuration of the above embodiments,
Various modifications are possible within the scope of the claims.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the standby mode of the mode switching device, Fig. 2 is a plan view of the stop mode shown above, Fig. 3 is a plan view of the gray mode shown above, and Fig. 4 is a plan view of the rewind 7 rewind playback mode. Figure 5 is a plan view showing the relationship between the reel chassis and main chassis in standby mode, Figure 6 is a plan view showing the relationship between the reel chassis and main chassis in stop mode, and Figure 7 is a plan view showing the relationship between the reel chassis and main chassis in standby mode. Side view, No. 8
9 is a perspective view of the brake drive lever, FIG. 9 is an explanatory view of the reel brake in the cassette, FIG. 10 is a perspective view of the mode detection switch, and FIG. 11 is a plan view of a conventional mode switching device. (1) Main chassis (11) Head cylinder (2) Tape loading device (3) Rotating body (4) Loading lever (5) Mode switching lever (6)...Pinch roller lever (8)...Brake lever Kanoba A Shazaza 3 $8 diagram

Claims (1)

[Claims] [1] Rotating body (3) driven by motor (12)
A shaft-like protrusion (31) is provided at an eccentric position of the protrusion (31).
A loading lever (4) and a mode switching lever (5) are provided so as to be engageable with each other, a tape loading device (2) is connected to the loading lever (4), and the mode switching lever (5) and the capstan (14) are connected to each other. A pinch roller lever (5) is provided between the capstan (1) and the pinch roller lever (6) is moved between the capstan (1
4) A mode switching device characterized by being pressed.