JPH0262755A - Cassette holder mechanism for recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a cassette holder mechanism with simple constitution capable of setting a cassette holder to a prescribed height on a main chassis by forming an engagement part and an engaged part respectively engaged with each other to a part corresponding to the cassette holder and the main chassis. CONSTITUTION:When a reel chassis 2 reaches the moving end of a head cylinder 11 while a cassette holder 20 is loaded to the descending end, an engagement part of the cassette holder 20 engages with the engaged part of the main chassis 1. Through the engagement, the height of the cassette holder 20 on the main chassis 1 is regulated. Since the entire head cylinder 11 or most of it is accommodated in the internal space of the cassette holder 20 on the reel chassis 2, the inside of the cassette holder 20 is shielded magnetically and the head cylinder 11 is protected from an external magnetic noise. Thus, the height of the cassette holder is regulated with simple constitution and the recording and reproducing performance is improved at the same time.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a device for recording signals on a magnetic tape or reproducing signals from a magnetic tape, and more specifically, a device for storing and holding a tape cassette. It is located between the cassette holder mechanism.

(Prior art) In recent years, video tape recorders (VTRs) have become smaller and smaller, especially 8mm VTRs that use magnetic tape with eight wheels in width.
The TR has been realized to be extremely small and lightweight.

As VTRs become smaller and lighter, camera-integrated VTRs that have a camera section and a VTR section have been put into practical use.

Also, by integrating an LCD color television and a VTR,
It is also possible to realize a portable image reproduction system. For such VTRs, there are strict demands for further miniaturization.

Therefore, as shown in FIGS. 41 and 42, a VTR has been proposed in which the depth of the device along the cassette insertion direction can be expanded or contracted depending on the mode (Japanese Patent Laid-Open No. 61-2716
No. 48 [11B15/665]).

In the above VTR, a head cylinder (11) equipped with a rotating magnetic head is installed on a main chassis (1), and a reel chassis (2) is installed on the main chassis (1).
) is arranged so as to be slidable toward and away from the head cylinder (11), and a supply reel stand (21) and a take-up reel stand (22) are arranged on the reel chassis (2). The reel chassis (2) is driven by a chassis drive mechanism (not shown) linked to a loading motor provided on the main chassis (1).

In the standby mode shown in FIG. 41, a part (A) of the reel chassis (2) protrudes from the main chassis (1), and in this state, the reel stand (21) on the reel chassis (2) ( 22), the tape cassette (150) is loaded into the tape cassette (150).

In the play mode shown in Fig. 42, the reel chassis (2
) slides toward the head cylinder (11) and inserts the head cylinder (1) into the opening (B) of the cassette (150).
1) has invaded. In this state, the magnetic tape is wound around the head cylinder (11), and signals are recorded or reproduced.

Therefore, in the above VTR, the depth can be reduced from <L, as shown in the figure, to L2, making it convenient to carry.

Furthermore, a cassette holder mechanism has been proposed in which the cassette holder can be raised and lowered and supported by a spring bias in the rising direction via a holder lifting mechanism consisting of a link mechanism on the reel chassis (Japanese Patent Laid-Open No. 61145756 [C11B]
15/665L A cam 7 lower is protruded from the link mechanism, and is engaged with a cam surface on the main chassis, and as the cam follower moves along the cam surface, a spring is applied while the reel chassis is moving. The cassette holder is held at the lower end of the reel chassis against the bias, and when the reel chassis moves forward to the moving end farthest from the head cylinder, the holding is released and the cassette holder rises due to the spring bias. do.

(Problem to be Solved) However, in the above-mentioned cassette holder mechanism, it is difficult to avoid a certain degree of variation in the height dimension when the link mechanism interposed between the cassette holder and the reel chassis is contracted. As a result, there is a problem in that an error occurs in the height position of the cassette holder at the lower end.

If this error occurs, the tape cassette in the holder cannot be set at a predetermined tape draw-out position on the main chassis.

In addition, in recording and reproducing devices that handle weak magnetic signals such as 8mm VTRs, in play mode, the magnetic head and rotary transformer installed in the head cylinder are affected by magnetic noise such as radio beats and electromagnetic waves from the outside world. There is a problem in that this leads to a decrease in recording and reproducing performance.

The first object of the present invention is to provide a simple structure that allows the cassette holder to be placed at a predetermined height position on the main chassis when the reel chassis reaches the moving end on the head cylinder side with the cassette holder locked at the lower end. Structure skein・
The purpose of this invention is to provide a component holder mechanism.

A second object of the present invention is to provide a recording and reproducing device of m construction that is hardly affected by magnetic noise during recording and reproducing.

(Means for Solving the Problems) The cassette holder mechanism according to the present invention has an engaging portion and an engaging receiving portion that can be engaged with each other in corresponding portions of the cassette holder (20) and the main chassis (1), respectively. This is what I did.

In addition, to solve the problem of magnetic noise, the engaging part and the engaging receiving part are both made of metal, and the cassette holder (20) is electrically grounded to the main chassis (1) by their engagement. do.

(Function) When the reel chassis (2) reaches the moving end on the head cylinder (11) side with the cassette holder (20) locked at the lowering end, the engaging part of the cassette holder (20) is connected to the main chassis ( 1), and by this engagement, the cassette holder (
20) is defined.

Furthermore, since both the engaging part and the engaging receiving part are made of metal, the cassette holder (20) is electrically grounded to the main chassis (1) by their engagement, and as a result, the inside of the cassette holder (20) is magnetically shielded.

As mentioned above, in the recording/reproducing device in which the reel chassis (2) is slidably disposed on the main chassis (1) for the purpose of downsizing, the reel chassis (2) is located closest to the head cylinder (11). In this state, the entire or most part of the head cylinder (11) is housed in the internal space of the cassette holder (20) on the reel chassis (2), so the inside of the cassette holder (20) is magnetically shielded. , the head cylinder (11) is protected from external magnetic noise.

(Effects of the Invention) According to the recording and reproducing device according to the present invention, the height position of the cassette holder can be determined by the simple structure consisting of the engaging part and the engaging receiving part as described above, and at the same time, the recording and reproducing performance can be improved. It is possible to plan.

(Example) Hereinafter, an example in which the present invention is implemented in an 8 mm VTR will be described in detail based on the drawings.

Note that the examples are for explaining the present invention, and do not limit the invention described in the claims or change the scope.
It should not be interpreted in the same way as m.

As shown in Figures 1 to 4, 8, and 9, the iRyo 1K VTR has a main chassis (1) equipped with a head cylinder (11), a supply reel stand (21), and a take-up reel stand (21). A reel chassis (2) equipped with a reel stand (22) is arranged so as to be able to approach and separate from the head cylinder (11).
0), the cassette holder (20) is supported so as to be movable up and down.

1, 2 and 9, the reel chassis (2) is moved in the direction away from the head cylinder (11),
This is a state in which the cassette holder (20) is protruded from the main chassis (1) to the maximum extent and raised from the reel chassis (2) (eject mode), and in this state, the tape cassette (150) is ejected from the cassette input slot (10). The cassette is inserted into the cassette holder (20).

Figure 3 shows a state (standby mode) in which the cassette holder (20) is pushed down from the eject mode and locked onto the reel chassis (2), and in this state the depth and length of the device is 103 m. .

FIG. 4 and FIG. 8 show a state in which the reel chassis (2) is retreated from the standby mode to the head cylinder (11) side, and the tape loading mechanism, pinch roller crimping mechanism, etc. are operated as described later. It is. The retracting distance of the reel chassis (2) from the standby mode is 16 m+*, and the minimum depth L2 of the device after the reel chassis retracts is 871, the width W is 1091, and the height H is 32 m5.

Chassis 3 The main chassis (1) is formed in a rectangular shape as shown in Figs. 10 and 18, and the reel chassis (2) has a large hollow in the center of the front end as shown in Figs. 16 and 19, and a head cylinder (11). A notch (23) is recessed in order to avoid contact with.

Main chassis (1) as shown in Figures 10 and 18
A pair of guide shafts (14) (15) are arranged parallel to each other on both sides of the reel chassis (2).
As shown in FIGS. 17 and 19, a pair of sliding members (24) (25) are arranged on both sides of the guide shaft (14) (15) and the sliding member (24) ( 2
5) are slidably fitted into each other as shown in Figures 1 to 4, thereby guiding the movement of the reel chassis (2) on the main chassis (1) and regulating both moving ends. ing.

As shown in FIGS. 12, 15, and 18, a loading motor (31) is provided on the main chassis (1), and a driving worm gear (32) is attached to the output shaft of the motor (31).
) is attached. Moreover, on the main chassis (1), there is a power shaft (34) extending in the direction of movement of the reel chassis.
) is constructed, and both ends thereof are supported by bearings (37) and (38) so as to be rotatable and movable in the axial direction.

The power shaft (34) has the driving ohm gear (32) near the bearing part (37) on the loading motor (31> side).
) A helical gear (33) is fixed, and a worm (35) is fixed near the other bearing part <38).

Also, the helical gear (33) of the power shaft (34) and the worm (
A tsuba (39) is fixed to the middle part of 35), and
A drive piece (141) constituting a holder lock release mechanism, which will be described later, is slidably fitted on the helical gear (33) side of the crocodile (39). Furthermore, the worm (
35) side has a pair of flanges (34m>(3
4b) are fixed at intervals, and a mode lever (4) described later is locked between both flanges.

On the other hand, the reel chassis (2) is shown in Figures 16 and 19.
As shown in the figure, a rack (36) extending along the reel chassis movement direction is fixed facing the notch (23), and the rack (36) always meshes with the worm (35).

Therefore, as shown in Fig. 20, the loading motor (3
1) drives the helical gear (33), and the power shaft (
34) rotates in the direction of the arrow, the rack (36) is driven by the worm (35), and the reel chassis (2
) moves backward toward the main chassis (1), and when the loading motor (3!) rotates in the opposite direction, the reel chassis (2) moves backward away from the main chassis (1). .

On the main chassis (1), facing the left front end (2a) of the reel chassis (2), there is a first detection switch (
130) is arranged, and the reel chassis (
2) reaches the end of movement in the backward direction, the front end (2a
) turns the first detection switch (130) ON, thereby detecting the completion of loading of the reel chassis (2).

Incidentally, when the reel chassis (2) is driven, a thrust load acts on the power shaft (34), but a roller (44) protruding from the mode lever (4) as described later moves the reel chassis (2).
) engages with the straight part (45a) of the guide groove (45),
Rotation of the mode lever (4>) and therefore axial movement of the power shaft (34) are prevented (see FIG. 21).

-10--In 5 As shown in Fig. 10, in the rear center of the main chassis (1), there is a head cylinder (11) equipped with a rotating magnetic head, a capstan (12), and a capstan motor (12) that drives the head cylinder (11). 13) and the magnetic tape to the head cylinder (
11) Tape loading fill (
5) A cylinder unit (16) is provided.

The tape loading mechanism (5), as shown in FIG.
Two ring gears (6) (61) are arranged concentrically in two stages, upper and lower, surrounding the ring gear (6) (61), and each of the ring gears (6) (61) is rotatably supported by a plurality of support rollers (64). has been done.

An arcuate guide rail (57) (58) extending along the circumference of the head cylinder (11) is fixed to the upper part of both ring gears (6) (61). Each guide rail is provided with a guide groove (59) <60), and a pair of tape guides (52) (53) (55) is provided in the guide groove, respectively.
A supply-side leading body (51) and a winding-opening leading body (54) having a protruding portion (56) are fitted in a slidable manner.

The supply side leading body (51) and the winding and opening leading body (54) are
It is connected to two upper and lower ring gears (6) and (61) via connecting pieces (62) and (63) shown in FIG. 11, respectively. Therefore, as the ring gears (6) and (61) rotate in opposite directions, the image guide bodies (51) and (54) move forward and backward on the guide rails (57) and (58).

The ring gears (6) and (61) are shown in Figs. 12 and 20.
As shown in the figure, the worm (3) is connected to the worm (3) via a gear mechanism (7).
5) is connected. The gear mechanism (7) has a worm (
The first, second, third, fourth and fifth tIi cars (71) (7
4) (77) (78) (79)

Each gear has gear portions formed in two stages, upper and lower, and the 1st tII
In the wheels and third gears (71), (74, and 77), the upper gear and lower gear rotate together, whereas the fourth gear (78) and the fifth tlI wheel (79) each rotate as shown in FIG. Upper gear (78a) (79a) and lower gear (78
b) (79b) are rotatably and concentrically supported independently of each other, and the torsion springs ()8c)<
79c).

The lower gear (72) of the first gear (71) is a worm wheel and meshes with the worm (35).
73) meshes with the lower gear (75) of the second gear (74). Further, the upper gear (76) of the second gear (74) is connected to the upper gear (77a) of the third gear (77) by the third tJi.
The lower gear (77b) of the wheel (77) meshes with the lower gear (78a) of the fourth gear (78). 4th gear (78)
The upper gear (78b) is the upper gear (78b) of the fifth gear (79).
79a) and the upper ring gear (6), and the fifth t! The lower gear (79b) of the first wheel (79) meshes with the lower ring gear (61).

As shown in FIG. 20, the upper gear (7) of the first gear (71)
3) and the lower gear (
75) means that a groove is formed on a part of the circumferential surface, and the upper gear (75) is
3) has a circular convex surface (73a) having a radius of the tip of the tooth.
is formed, and a part of the lower gear (75) is formed with an arcuate concave surface (75a) having a curvature equal to that of the arcuate convex surface, and the arcuate convex surface (73a) and the arcuate concave surface (75a) have a second
As shown in Figure 1, when the loading of the reel chassis (2) is completed, they engage with each other to form an intermittent rotation mechanism.

Also, as shown in Fig. 24, the last f* of the upper gear (73)
The rising surface from the Ik bottom of (73a) to the arcuate convex surface (73a) has a normal tooth profile curve shown by a two-dot chain line, for example, a suppression surface (73b) tilted toward the arcuate convex surface (73a> side) than the involute tooth profile. Therefore, as shown in the figure, just before the engagement between the upper gear (73) of the first gear (71) and the lower gear (75) of the second gear (74) is completed, the lower gear < The pressing surface (73b) of 75) is the lower gear (75) of the second gear (74)! & after f&(75a
) to rotate the second guide wheel (74) by the final slight angle, the intersection of the common normal at the contact point of the first striking surface and the line connecting the rotation centers of both gears is , the 1st t than when the tooth surfaces mesh normally! As a result, the angular velocity ratio of the second gear (74) to the first gear (71) is lower than when the m-plane meshes normally. Correspondingly, the rotational torque of the 21st driving wheel (74) is increased.

Note that it is desirable to form a tooth profile corresponding to the pressing surface (731) also on the last tooth surface of the lower gear (75) of the second gear (74).

In the standby mode shown in FIG. 20, when the first gear (71) rotates clockwise, the second and third tk wheels (74) (
77) and (78), the upper ring gear (6) rotates clockwise to move the supply-side leading body (51) clockwise. On the other hand, the lower ring gear (61) is rotated counterclockwise by the drive of the fifth gear (79) to move the winding and opening body (54) counterclockwise.

As a result, in the standby mode shown in FIG. 5, the supply side leading body (51) and the winding/spreading body (54) located inside the magnetic tape (151) of the cassette (150) move along the guide rail. Move and pull the magnetic tape out of the cassette. Thereafter, the image guide body is moved to the end of the movement shown in FIG. 6 by a stopper (
11 (57a) (58a)), and the magnetic tape (151) is placed in the head cylinder
Wrap it around the circumferential surface of the tape at a predetermined angle (270 degrees), and the tape loading is completed.

When the image guide body (51) (54) hits the stopper, the first m wheel (71) and the second tFI wheel (74) form a mesh shape as shown in Fig. 24! υ, and from this state the loading motor (31) overruns and rotates, thereby causing the pressing surface (73b) of the upper gear (73) of the first guide wheel (71) to press against the surface of the second FA wheel (74). Lower gear (
75), the rotational torque of the second gear (74) increases as described above.

This increased rotational torque causes the gear mechanism (7) to further move f? L, as a result, the torsion spring (7
8c) (79c) is elastically deformed, and due to the elastic force, the upper gear (78b) of the 4th TK car (78) and the 5th
The lower gear (79b) of the gear (79) is urged to rotate, and thereby the supply side and the width opening body (51) (54)
is brought into pressure contact with the stopper.

Even if the first gear (71) further rotates clockwise from the above state, the arcuate convex surface (73a) of the upper gear (73) of the first fa wheel (71) and the second vI wheel (74 )
Since the arcuate concave surface (75a) of the lower gear (75) is engaged, the first gear (71) idles and the second gear (74)
Rotational force is not transmitted to subsequent gears. At this time, the reaction force of the torsion bar (79c) causes the second gear (74
), a clockwise rotational force acts on the arcuate convex surface (
73a) and the arcuate concave surface (75m>), the second gear (74) does not rotate.

In the above tape loading mechanism (5), the important operation is that the t-flame also moves the guide body (
51) While holding (54) at the moving end on the guide rail, the arcuate convex surface of the first tII wheel (71) moves onto the second gear (74).
) The worm (35) can be rotationally driven by the loading motor (31) within the range of engagement with the arcuate concave surface of the worm (35). Therefore, as will be described later, the rotation of the worm (35) is converted into axial movement of the power shaft (34), and the pinch roller crimping mechanism (8), which will be described later, can be operated for crimping.

Bin Roller Pressure 8 As shown in Figs. 83) are rotatably supported coaxially and independently of each other, and a spring (85) is stretched between the levers (82) and (83).

A pinch roller (81) is provided on the free end of the pinch roller lever (82) to protrude upward, and a cam follower (84) is provided on the free end of the driving lever (83) to protrude downward. An engagement pin (83a) is provided protruding near the follower (84). The cam follower (8
4) is the force created on the main chassis (1) through the arc hole made on the reel chassis (2)! , Ko (86
). Further, the engaging pin (83a) is connected to an end of a slider (87), which will be described later.

Furthermore, a reel chassis (2) is pivotally supported at a position eccentric from the center of rotation of the pinch roller lever (82), and a reel 1 pull-out lever (98) is connected to the lever lever (98) and the pinch roller lever (82). 9 winding-side drawer lever (98) which is pivotally connected to 82) by a connecting link (80).
A bottle (97) for hooking the magnetic tape in the cassette and pulling it out from the cassette is provided at the free end of the cassette to protrude upward.

The cam 1ll (86) on the main chassis (1) has a driving slope (86 m) that is inclined toward the center of the main chassis along the retreating direction of the reel chassis (2) as shown in FIG.
A parallel surface (86b) extending parallel to the retreating direction from the end of the capstan (12) Ill of the driving slope (86a).
and a relief surface (86c) that is inclined further toward the center of the main chassis from the end of the parallel surface (88b).

Therefore, in the process of retracting the reel chassis (2) from the standby mode shown in Fig. 25 to the loading completion state (ready mode) shown in Fig. 26, the cam follower <84
) is pressed by the driving slope (86a) of the cam groove (86), the driving lever (83) rotates clockwise, and the pinch roller lever (82> and the take-up side pull-out lever (98) are rotated accordingly. Rotate clockwise.

Then, when the loading of the reel chassis (2) is completed as shown in No. 26I21, the pinch roller (81)
will be located slightly in front of the capstan (12). At this time, the cam follower (84) is inserted into the cam groove <86
), and in this state, the cam follower (84) is released from restraint, and the drive lever (83) is free to rotate clockwise.

Furthermore, as shown in FIGS. 16 and 25, a slider <87) extending left and right along the chassis notch (23) is attached to the front edge of the reel chassis (2).
) The engagement pin (83a) of the driving lever (83) is connected to the right end of the slider (87), which is supported so as to be relatively movable within a predetermined range in the left-right direction. At the left end of the frame is a 1-series receiving part (88) for the slider drive bin (41) of the mode lever (4).
) is recessed. Further, a bottle (89) for driving a regulating plate (160), which will be described later, is provided in the center of the slider to protrude downward.

The mode lever (4) is as shown in Figs. 15, 22 and 23.
[As shown in A, the support shaft (40
), a slider drive bin (41) is provided protruding from the free end on the chassis center side, and a second and third detection switch (1), which will be described later, is provided on the other free end side.
31) A first protrusion (42) and a second protrusion (43) for turning on (132) are formed into two forks.

Further, a limb drive portion (46) is protruded from the engagement portion of the mode lever (4) with the power shaft (34) and is sandwiched between the pair of flanges (34a) and (34b) with play in the axial direction. has been done. Furthermore, a roller (44) is provided on the upper surface of the mode lever (4) in the vicinity of the second projecting piece (43), and the roller (44) is formed on the back surface of the reel chassis (2) as shown in FIG. The guide groove (45) is engaged with the guide groove (45).

The guide jl (45) has a straight part (45) for keeping the mode lever (4) in a constant position when moving the reel chassis.
a) is formed, and the reel chassis (2) is connected to the second reel chassis (2).
When the mode lever (4) is moved back to the loading completion position shown in Figure 2, the first slope (45Ll) allows the mode lever (4) to rotate counterclockwise, and the mode lever (4) is rotated at the eject mode position shown in Figure 23. the second which allows rotation in the direction;
A slope (45c) is formed.

When the loading motor (31) drives the power shaft (34) further in the direction of the arrow from the state in which the loading of the reel chassis (2) is completed as shown in FIG. 21, the reel chassis (2) can no longer move backward; Worm (35
) receives a thrust in the reel chassis protruding direction (downward in Fig. 22) through engagement with the rack (36) in the locking position, which causes the power shaft (34> to move in the reel chassis protruding direction). Become.

As a result, the mode lever (4) is driven counterclockwise as shown in FIG. 22.

From the standby mode shown in Figure 25, the reel chassis (
2) retreats and the driving lever (83) rotates clockwise as described above, the slider (87)
slides to the left, and when the loading of the reel chassis is completed as shown in Figure 26, the slider (87
) will engage with the slider drive pin (41) of the mode lever (4).

From this state, the mode lever (4>) rotates counterclockwise due to the axial movement of the power shaft (34).
The slider (87) is pulled by the slider drive pin (41) and slides from the position shown in FIG. 26 to the position shown in FIG. 27. At this time, as shown in Figure 22, the mode lever (
The roller (44) of the guide groove (44)
51+), the mode lever (4) is allowed to rotate counterclockwise.

Along with this, the driving lever (83) and the pinch roller lever (82) are driven clockwise from the state shown in FIG.
The spring (85) interposed between the driving lever (83) and the pinch roller lever (82> ) is stretched, and the biasing force of the spring (85) presses the pinch roller (81) onto the capstan (12) via the magnetic tape (151).At this time, the drive lever (83)
It is no longer restrained by the cam groove (86) and can freely rotate clockwise.

When the pinch roller crimping operation is completed, the 22121st
No-Yaku Mort Lever (4>) 1st protrusion (42M) C 2nd
The detection switch (131) is turned ONL, thereby stopping the loading motor (31).

When the loading motor (31) reverses from the state shown in Fig. 22, the power shaft (34) moves in the same direction due to the upward thrust acting on the worm (35), and the mode lever (4) moves in the same direction. is driven clockwise.

At this time, the roller (44) provided on the mode lever (4)
is the first guide 1fl (45) on the reel chassis (2).
Since the reel chassis (2) is prevented from moving in the unloading direction by contacting the slope (45b), the reel chassis (2) is not driven by the rotation of the reel chassis (35).

Therefore, first, the power shaft (34) moves in the axial direction and the mode lever (4) is driven to the state shown in FIG. 4
5), and after the reel chassis (2) is allowed to move, the power of the worm (35) is transmitted to the rack (36), and the reel chassis (2) is unloaded. It will begin.

Pack tension lever 9 As shown in No. i6 [21], the bank tension lever 11 (9) is arranged on the upper left side of the reel chassis (2) (1 m
be done. The mechanism faces the supply reel stand (21),
Bin for hanging the magnetic tape inside the cassette (91)
A pack tension lever (92) protruding from the reel chassis (2) is pivotally supported on the reel chassis (2).A cam follower (93) is provided protruding downward near the rotation center of the lever (92). The cam follower (93) passes through an arcuate hole (27) formed in the reel chassis (2) and engages with the cam jM (95) on the main chassis (1>).

Pack tension lever (92) and reel chassis (2)
) is tensioned between the pack tension lever (92) and biases the pack tension lever (92) in the opening direction.

Furthermore, a brake band (94) is attached to the base end of the cam follower (93) to be wrapped around the circumferential surface of the supply reel stand (21).
) are connected at one end.

As shown in FIG. 28, the cam groove (95) includes a guide slope (95a) that slopes away from the center of the main chassis along the backward direction of the reel chassis (2), and a rear end of the guide slope. A parallel plane (
951+) and a relief surface (95c) extending from the end of the parallel surface (951+) at a substantially right angle to the outside of the chassis.

Therefore, when the reel chassis 2) moves 7138 times from the standby mode shown in FIG. 28, the cam follower (93) moves along the guide slope (95a) of the cam groove (95), and accordingly As shown in Fig. 30, the pack tension lever <92> rotates in the biasing direction of the spring (99), that is, counterclockwise, and the drawer bin (91) pulls out the magnetic tape (151) from the cassette.

Also, with the rotation of the pack tension lever (92),
The brake band (94) is in sliding contact with the circumferential surface of the supply reel stand (21), and in this state, the bin (91) serves as a tension detection unit to adjust the tension of the brake band (94).
As a result, appropriate tension is applied to the magnetic tape (151). At this time, as shown in Fig. 30, the cam follower <93> faces the flank (95c) of the cam groove (95), and the pack tension lever 92> can freely rotate counterclockwise, that is, in the direction of applying tension. It has become. Therefore, in the process of tension adjustment, the cam follower (
93) performs reciprocating movement between the flank (95c) and the parallel plane (95b) facing the flank.

1-rule 100 In the VTR of this embodiment, the capstan motor (1
A system is adopted in which the power of step 3) is transmitted to the take-up reel stand (22) or the supply reel stand (21) to drive these reel stands.

As shown in Figure 18, the main chassis (1) has r<icz and a front edge l\
Towards the first, second, third and fourth gears (102)
One-stroke convoy consisting of (103) (104) (105) (
101) are arranged, and the 118th wheel (102) is fixed to the output shaft of the capstan motor (13).

The main chassis (1) is also provided with a well-known oscillating idler (110) at the end of the gear train.

The oscillating idler (110) is a driving gear (111) that is constantly meshed with the fourth gear (105) as shown in FIG.
A support arm (113) is pivotally supported on the rotating shaft of the support arm, and an idler gear (112) that constantly meshes with the drive gear (111) is provided at the free end of the support arm. A friction member (not shown) is interposed between the arm (113) and the arm (113). A protrusion (114) is formed on the support arm (113) toward the center of the chassis.

Furthermore, in the center of the main chassis (1), a regulating plate (160) integrally molded from synthetic resin is attached to the side of the oscillating idler (110) and slides in a predetermined pattern in the left and right direction. Possibly supported. The regulation plate <160) has
A convex portion (161) is formed opposite to the projecting piece (114) of the oscillating idler (+10), and the slider (
The cam wall (1) with which the bottle (89) protruding from the cam wall (1
63). The cam wall (163) has an oscillating idler (11) along the reel chassis backward direction.
0) A slope inclined at 11t1 is formed. In addition, the regulation plate (160) is equipped with an idler (11) that swings the regulation plate body.
An elastic portion (162) biasing toward the 0) side is integrally formed;
The tip of the elastic portion is locked to the main chassis (1).

On the other hand, as shown in FIGS. 19 and 28, there is a chassis notch (23
) A gear train consisting of a fifth gear (106), a sixth gear (107), and a reel drive gear (116) is arranged toward the take-up reel stand (22).

The reel drive gear (116) passes through the reel chassis (2), emerges from the top surface of the chassis, and connects to the take-up reel stand (22).
) is meshed with the gear part (22a).

Further, on the back side of the central part of the reel chassis (2), a first relay gear (117) and a second relay gear (118) are arranged from the reel drive gear (116) side toward the supply reel stand (21).
) and a reel drive gear (119). The reel drive gear (119) is connected to the reel chassis (
2) and emerges from the top surface of the chassis, and the supply reel stand (
21) meshes with the gear (21a).

In the standby mode shown in Figure 28, the capstan (
12) rotates counterclockwise, that is, in the tape winding direction, the oscillating idler (110) accordingly oscillates counterclockwise, and the idler gear (112) rotates in the reel chassis (as shown in the figure). 2) Upper fifth gear (106
).

Therefore, the rotation of the capstan motor (13) is controlled by the oscillating idler (110), the fifth gear (106), and the sixth gear (
107) and is transmitted to the take-up reel stand (22) via the reel drive gear (116), and the reel stand rotates clockwise to wind up the tape.

When the reel chassis (2) moves backward toward the head cylinder (11) from the state shown in Fig. 28, in this process, the idler gear (112) of the oscillating idler (110) shifts to the fifth The gear (106) and the reel drive gear (11B) simultaneously chirp, and when the reel chassis (2) retreats to the loading completion position, the third
As shown in Figure 0, the idler gear (112) is the fifth gear (10
6) and sprays only the reel drive gear (116).

In addition, as shown in FIGS. 25 to 26, in the process of the reel chassis (2) moving backward, the slider (87)
The bottle (89) protruding from the cam wall (
163), and the regulation plate (160) is brought into contact with the elastic part (162).
) to move it slightly to the left. In the state shown in FIG. 26, the convex portion (161) of the regulating plate (160) has slightly advanced into the oscillating area of the oscillating idler (110), and the convex portion is connected to the projecting piece (144) of the oscillating idler (110). ), the clockwise rotation end of the oscillating idler (110) is restricted. As a result, the idler gear (
112) is maintained in a non-meshing state with the first relay gear (117).

In addition, in the state shown in Fig. 26, the capstan (1
2) is rotating clockwise, that is, in the tape rewinding direction, and a clockwise swinging force is applied to the swinging idler (110).
112) does not mesh with the reel drive gear (116).

As a result, the idler gear (112) is maintained in a neutral state in which it does not mesh with either the first relay gear (117) on the supply reel stand side or the reel drive gear (116) on the take-up reel stand side.

In addition, this neutral state allows both reel stands to rotate freely,
This is set to pull out the magnetic tape from both reels of the drawer when loading the reel chassis (2), and the magnetic tape is pulled out from both reels by this V
In a TR, since the angle of each roll of magnetic tape relative to the head cylinder is large, there is large friction between the head cylinder and the magnetic tape, and pulling out the magnetic tape from both reels prevents damage to the magnetic tape due to the friction. This is because it becomes

Thereafter, in the process of retracting the reel chassis (2) from the position shown in FIG. 26 to the play mode position shown in FIG. Press the wall (163) to move the regulation plate (160) to the left. As a result, the protrusion (161) of the regulation plate (160)
10), the swinging idler (110) is allowed to swing in the left-right direction.

When the capstan (12) rotates counterclockwise in the state shown in Fig. 30, the take-up reel stand (22) is driven clockwise, and the tape is wound during normal playback or fast forwarding. .

Also, when the capstan (12) rotates clockwise,
The oscillating idler (110) performs a clockwise oscillating motion, and the idler gear (112) is disengaged from the reel drive gear (116) as shown in FIG.
21> meshes with the first relay gear (117) connected to the gear.

Then, the clockwise rotation of the idler gear (112) is caused by the supply reel stand (
21), which drives the supply reel stand (21) counterclockwise, thereby winding the tape during rewind playback or tape rewinding.

Holder 120 As shown in FIG. 17 and FIGS. 32 to 34, holder elevators 11 and 120 are installed on both sides of the reel chassis (2).
A cassette holder (20) is supported via (120).

Holder lift fi II! (120) is composed of a pair of left and right link mechanisms respectively disposed on both sides of the cassette holder (20), and each link mechanism is connected to the first arm (120).
3) and the second arm (124) are disposed so as to intersect with each other, and the two arms are connected to each other so as to be relatively rotatable at the intersection point. The cassette input port (1) of the first arm (123)
The base end of the cassette holder (20) is fitted into the support hole (20 m) provided in the side plate of the cassette holder (20), and the tip part is inserted into the guide hole (20 m) formed in the side plate of the reel chassis (2). 127).

Also, the cassette inlet (10) of the second arm (124)'
The base end of the side is rotatably fitted into the support hole (126) provided in the side plate of the cassette holder (20), and the tip part is fitted into a guide hole (20b) that is long in the horizontal direction in the side plate of the reel chassis (2). to be slidably fitted.

A spring (125) is stretched between the first arm (123) and the second arm (124).

As a result, the cassette holder (20) is supported on the reel chassis (2) so as to be movable up and down, and is urged in the upward direction.

Holder lock 140) As shown in Figures 32 to 34, the holder elevator 1i (1
The left link mechanism of 20) has a cassette holder <2
Holder lock mechanism (
140) are linked.

The holder lock R structure (140) is connected to the second arm (124).
) is further extended toward the main chassis (1), and a lock bin (128) is provided at the extended end to protrude toward the inside of the holder.

On the other hand, the side plate of the cassette holder (20) has a lock arm (
146) is rotatably supported on the shaft, and is forced counterclockwise by a turret (170) stretched between it and the reel chassis (2). A locking piece (14) that can be engaged with the lock bin (128) is provided at the free end of the lock arm (146).
7) and a press bottle (148) is provided protruding outward near the locking piece (147). The counterclockwise rotation end of the lock arm (14B) is restricted by a stopper (129) provided on the cassette holder (20).

Further, a cam portion (29) that is tilted low toward the rear is formed at the end of the side plate of the reel chassis (2), facing the pressing bottle (148) of the Ron Farm (146).

Therefore, when the cassette holder (20) is pushed down from the eject mode shown in FIG. 34, the pressing pin (148) hits the cam portion (29) and the lock arm (146) rotates slightly clockwise. At the same time, the second arm (
+24> rotates toward a horizontal position. When the cassette holder (20) is further pushed down to the lowering end, the pressing bottle (148) is separated from the cam portion (29) as shown in FIG. 32 and rotated counterclockwise by the bias of the spring (i70). As a result, the locking piece (14) of the lock arm <146
7) engages the lock pin (128) of the second arm (124) to lock the cassette holder (20) at the lower end.

Furthermore, a pressing pin (148) is provided on the inner surface of the cam portion (29).
) A fourth detection switch (133) is provided at a lower position. The switch is closed by the press bottle (148) when the cassette holder (20) is locked as shown in FIG. 32, and detects the holder locked state. Based on the detection, loading of the reel chassis is started.

Holder lock: The holder lock mechanism (140) is unlocked by rotating the lock arm (146) counterclockwise by moving the slide plate (144) provided on the main chassis (1), and releasing the locking piece (140). 147) and the lock bin (128).

As shown in FIGS. 21 and 23, the slide plate (144) is disposed on the side of the power shaft (34) so as to be slidable within a predetermined range along the moving direction of the reel chassis (2). It is biased toward the reel chassis (2) by a torsion spring (145) on the chassis (1).The slide plate (144) has a
The first protrusion (1) to be engaged with the lock arm (146)
71) is formed, and a second protruding piece (172) is formed at the end opposite to the first protruding piece, with which the negative free end of the driven lever (143) to be described later engages. .

The slide plate (144) supports a driven lever (143) and a driving lever (142) that are pivotally supported on the main chassis (1).
) via the drive piece (14) fitted to the power shaft (34).
1). One of the pair of engaging parts formed on the free end of the drive lever (142) is connected to the drive piece (141).
), and the other engaging part is the driven lever (143).
abut one free end of the In addition, the driven lever (14
The other free end of 3) is located above the slide plate (144).
and attach the extended end to the slide plate (144) with the second projecting piece (
172).

As shown in FIG. 20, when the loading of the reel chassis (2) is completed, the loading motor (31
) further rotates the power shaft (34) in the direction of the arrow, the reel chassis (2) can no longer move forward, so the worm (35) moves from the rack (36) in the locked state.
〉, the reel chassis t! It receives thrust in the direction (upward direction in Figure 20), which causes the power shaft (3
4) will move in the reel chassis backward direction.

As a result, the mode lever (4) is driven clockwise as shown in FIG. At this time, the roller (44) of the mode lever (4) faces the second slope (45e) of the guide groove (45), allowing clockwise rotation of the mode lever (4).

As the power shaft (34) moves in the axial direction as described above, the drive piece (141) moves the drive lever (
142) counterclockwise, and the driving lever (142) is driven counterclockwise.
) drives the driven lever (143) counterclockwise, and the driven lever (143) moves the slide plate (144) against the spring (145).

When the slide plate (144) moves in the reel chassis backward direction in this way, the first protrusion (144) moves as shown in FIG.
71) presses against the free end (149) of the lock arm (146) and rotates the lock arm clockwise.

This causes the locking piece (147) to lock into the lock bin (128).
) to M, and the cassette holder (20) is unlocked. As a result, the cassette holder (20) is raised by the force of the spring (125) as shown in FIG. At the same time, the lock arm (146) moves to the counterclockwise rotation end (l 4m).

Thereafter, as will be described later, the slide plate (144) is returned to the reel chassis (2) side as shown by the two-dot chain line in FIG. 34, thereby enabling the next holder locking operation.

From the state of No. 2312I, loading motor (31)
When the power shaft (34) is rotated in the opposite direction of the arrow by the drive of the war 1. (35) moves the power shaft (34) in the same direction, the mode lever (4) returns to the position shown in Fig. 20, and the slide plate (144) moves in the same direction. returns to the position shown in FIG.

In the state shown in Fig. 23, the roller (44) of the mode lever (4)
) is the second slope (4) of the guide groove (45) on the reel chassis.
5c) to prevent the reel chassis from moving backward, the reel chassis will not move due to the drive of the worm (35).

Therefore, first, the power shaft (34) is moved in the axial direction, and the mode lever (4) is driven to the state shown in FIG. 20. Then, the roller (44) of the mode lever (4) separates from the second slope (45c) of the guide groove (45), and after the reel chassis (2) is allowed to move, the worm (35
) is transmitted to the rack (36), and loading of the reel chassis (2) is started.

In order to hold the cassette holder (20) at a predetermined height position on the main chassis (1) in the holder stand M' position 32 [21],
Holder positioning am described below is employed.

As shown in FIGS. 9, 10, and 17, an engagement bin (12
1) is provided to protrude outward.

On the other hand, on the main chassis (1), at the rear end on the right side,
At the front of the main chassis, open the 0-shaped engagement receiving piece (1
22) is provided protrudingly. The position of the holding piece (122) is
As shown in FIG. 4, when the loading of the reel chassis (2) is completed, it is specified that the engaging pin (121) is tightly fitted.

Therefore, the left side plate of the cassette holder (20)
In the state shown in the figure, lock arm (146) and lock bin (
128), it is held at a predetermined height position on the main chassis (1), and this held state is maintained even when loading is completed and in the play mode as shown in FIG. Further, the right side plate of the cassette holder (20) is positioned at a predetermined height position on the main chassis (1) by engagement between the engagement pin (121) and the retaining piece (122) as shown in Fig. 4. be detained.

As a result, in play mode, the cassette holder (2
The tape cassette in the main chassis (1) is held horizontally at a predetermined height position on the main chassis (1).

Further, the engagement pin (121) is electrically connected to the cassette holder (20), and the engagement receiving piece (122) is electrically connected to the main chassis (1). As a result, the cassette holder (20) is grounded to the main chassis (1), and the inside of the cassette holder (20) is magnetically shielded. Therefore, in play mode, the cassette holder (2
0) will be surrounded by the head cylinder (
The magnetic head and rotary transformer (11) are protected from external magnetic noise.9 As shown in Figure 8 above, there is a magnetic head and rotary transformer installed in the cassette on the front edge side of the central part of the reel chassis (2). Reel lock release piece (26) for unlocking the reel lock mechanism (not shown)
is installed protrudingly.

In addition, the reel chassis (2) is provided with a light emitting element (134) on the rear edge side of the central part, and a tape end sensor (134) and a tape top sensor that receive light from the light emitting element are installed on both sides of the chassis. (137) is provided, so that in the play mode, the cassette in the cassette holder (20) is at the tape end state where the magnetic tape is completely wound onto the take-up reel, or is completely fed. It is detected whether the top of the tape is rewound onto the reel.

As shown in Fig. 9, the second arm (124) on the right side of the holder elevator flI (120) has an arc-shaped gear piece (
173) is provided protrudingly, and a damper is provided on the reel chassis (2) to mesh with the gear piece (173) and apply appropriate resistance to the upward movement of the cassette holder (20).
(174) is provided.

The reel chassis (2) also has a supply reel rotation sensor (138) and a take-up reel rotation sensor (138) facing the back surfaces of the supply reel stand (21) and the take-up reel stand (22) as shown in FIG. 139) is installed to detect the rotation of each reel. The rotation sensor (138) (1
39) is constituted by, for example, a photoreflector.

Figure 35 shows the configuration of a control circuit that controls the operations of the capstan motor (13) and loading motor (31).

The system controller (180) that controls the movement of the VTR in various modes is composed of a microcomputer, and the input board includes the aforementioned first to fourth detection switches (130) (131) (132) (133). )(13
4), cassette discrimination switch (135), tape end sensor (136), tape top sensor (137)
, a supply reel rotation sensor (138) and a take-up reel rotation sensor (139) are connected to the output boat.
Capstan motor (13) and loading motor (
drivers (1) that generate drive voltages for
3a) (:11a) is connected.

The system controller (180) is set with a computer program for performing mode transition operations, which will be described later, based on command signals from various operation keys (not shown) provided on the operation panel of the VTR. 36th
As will be described later with reference to FIGS. 40 to 40, the VTR of the present invention
A computer program is set up to perform specific operations.

Main T-modes' - In a single VTR, there is an eject mode in which the cassette holder rises and a tape cassette can be inserted, a standby mode in which the cassette holder is pushed down in the eject mode and locked onto the reel chassis, and a standby mode in which the cassette holder is pushed down and locked on the reel chassis. There is a play mode in which loading the sole chassis, tape loading, pinch roller crimping, etc. are performed, and signal recording and playback is possible, a stop mode in which the rotation of the head cylinder and capstan is stopped in the play mode, and a play mode in which the rotation of the head cylinder and capstan is stopped. A total of five modes are set, including a stop mode and a ready mode in which the pinch roller is released from pressure.

■ Transition from standby mode to ready mode (loading completion letter R) In standby mode with the cassette holder (20) locked on the reel chassis (2) as shown in Figure 3, when a loading command is issued from the operation panel. , the loading motor (31) starts and the reel chassis (2
) is moved back from the standby mode position shown in FIG. 5 to the loading completion position shown in FIG. 6, and the first detection switch (130) is turned on as shown in FIG.

During this process, the pack tension lever (9
2) As the take-up side pull-out lever (98) and pinch roller lever (82) open in the tape pull-out direction, the supply side and take-up side guide bodies (51, 54) move, and the magnetic tape is removed as shown in the figure. (151) is stretched along a predetermined route. Further, the mode lever (4) and the slider (87) engage with each other.

■ Transition from ready mode to play mode No. 6 (2I
When the loading motor (31) continues to rotate from the ready mode, the power shaft (34) moves in the axial direction as shown in FIGS. ) and press the pinch roller (81) onto the capstan (12) via the magnetic tape (151) as shown in FIG.

As a result, the second detection switch (13
1) is turned ON, and the ON signal is sent to the system controller l.
- is sent and the loading motor is stopped.

In the play mode shown in Figure 7, the head cylinder (11)
The capstan motor (13) rotates to record or reproduce signals.

In the play mode, the capstan (12) is rotated at high speed to fast-forward or rewind the tape.

■ Transition from play mode to stop mode tH?
When the command to shift to stop mode is issued from the panel, the head cylinder (11) and capstan (12)
rotation stops. The reel chassis (2) maintains the position shown in FIG.

■ Transition from play mode or stop mode to ready mode If tape slack occurs between the capstan and the head cylinder during tape rewinding as described later, the 6th
A ready mode in which the pinch roller shown in the figure is released from pressure is set.

At this time, by driving the loading motor (31),
The power shaft (34) is driven axially from the position of FIG. 22 to the position of FIG. 21. Along with this, the slider (8) moves to the right as shown in FIG. 26 from No. 27 [2I], and the capstan (12) of the pinch roller (81)
The crimp of /\ is released. When the crimp is released,
It is detected when the first detection switch (130) in FIG. 21 is opened, and the loading motor (31) is stopped by this detection signal.

■Transition from ready mode to standby mode By rotating the power shaft (34) in the direction opposite to the arrow from the state shown in FIG. 21, the reel chassis (2) is driven to the standby mode position shown in FIG. 20.

Further, the first gear (71) is rotated counterclockwise by the drive of the worm (35) from the state shown in FIG. The arc convex surface of the upper gear () 3) of the first gear (71) separates from the arc concave surface (75a) of the lower gear () 5) of the second gear (74) (73a), and the upper gear (73) and lower gear (75) starts meshing of the tooth surfaces. Therefore, the rotation of the worm (35) is transmitted to both ring gears (6) and (61) via the gear mechanism (7), and as shown in FIGS. 51) (5
4) returns to the tape loading start position in the cassette (150).

At the same time, the drawer levers (9) on the supply side and take-up side
2) (98) and the pinch roller lever (82) also return to the tape loading start position in the cassette.

In addition, in parallel with the return operation of the guide bodies (51) and (54), the take-up reel stand (22) was driven in the tape winding direction and extended toward the head cylinder (11) as described later. The magnetic tape (151) is rewound into the cassette.

Note that the reel chassis (2) does not stop in standby mode, but shifts to the next eject mode.

■ Transition from standby mode to eject mode By rotating the power shaft (34) in the opposite direction of the arrow from the standby mode shown in Fig. 20, the power shaft (34) changes as shown in Fig. 23.
34) is driven in the axial direction, and along with this, the slide plate (
144) moves against the first spring (145), thereby performing the holder lock release operation shown in FIGS. 32 to 34, and the cassette holder (20)
rises.

In the eject mode shown in Fig. 23, the third detection switch (
It is detected that 100 ssec has passed since the loading motor (31
) is stopped.

Go to 11■ Tape Slack Handling Method During tape rewinding, if the magnetic tape is stopped at the cylinder circumferential surface due to friction between the head cylinder and the tape, this causes tape slack between the cylinder and the capstan. In order to wind up this tape slack, a program is set to carry out the operation shown in FIG. 38.

The tape slack processing method will be described below with reference to FIG. 38.

If tape slack occurs between the head cylinder (11) and capstan (12) during tape rewinding, only the rotation of the supply reel stand (21) will stop. Detected by (
Based on the detection, the rotation of the capstan (12) is temporarily stopped ((182) in the same figure).
Next, the loading motor (31) is started in the unloading direction, and the pinch roller (81) capstan (
Release the crimp on the capstan (12) and then
) in the FWD direction (the direction in which the magnetic tape is sent out to the take-up reel stand) at a speed seven times that of normal playback (see figure (
183)) By making the take-up reel stand (22)
Rotate in the tape winding direction. Thereafter, when the supply reel stand (21) starts rotating, or after 5 seconds have elapsed, the capstan (12) and head cylinder 11) are stopped ((184) in the figure).

This causes the tape slack to be taken up on the take-up reel.

After that, only the power OFF command will be accepted for eject operation creation.

The purpose of the 5 second timer operation is to protect the tape if the supply reel 21) fails to rotate for some reason.

■ Tape unloading method During the unloading operation of the reel chassis (2), the reel chassis (2) or cassette holder (20
) to prevent the reel chassis from moving.
When there is a book Ia, the power generated from the loading motor (31) acts as a load on the mechanism from the loading motor (31) to the reel chassis (2), and there is a risk of damaging the mechanism. There is.

Therefore, in this VTR, the driving voltage of the loading motor (31) during unloading of the reel chassis (2) is set lower than that during loading (sections T2, T1, T, in FIG. 36). , the above damage is suppressed to a minimum.

The reason why the driving voltage for unloading can be lower than that for loading is that no load is applied to draw out the tape during unloading, and the driving force required for unloading is smaller than that for loading.

36A (a) and (b) show the drive voltages supplied to the loading motor (31) during loading and unloading, respectively.

During loading, a DC voltage of <5V is sent to the loading motor (31) as shown in Figure 36A (a).

On the other hand, during unloading, a pulse width modulated drive pulse with a cycle of 20 m5ec and a duty of 40% is sent to the loading motor (31) as shown in Fig. 36A, and as a result, the loading motor (31)
It will be driven with a voltage smoothed to (2).

■ Tape winding method ratio during unloading In a VTR, when the loading motor (31) is started in the unloading direction from the ready mode shown in Fig. 21, the rotation of the worm (35) is caused by the rack (36). The reel chassis (2) starts to be driven, but the gear a! The rotation of the first gear (71) of fil (7) is immediately caused by the operation of the intermittent rotation mechanism consisting of the arcuate convex surface (73m) and the arcuate concave surface (75a).
) (61), and after a predetermined time delay from the start of movement of the reel chassis (2), that is, the first t & car ()
1) The unloading operation of the supply side and the winding and opening body (51) (54) is started from the time when the upper gear (3) meshes with the lower gear (75) of the second gear (74).

Therefore, in the process of moving only the reel chassis (2), as the cassette on the reel chassis (2) moves,
The magnetic tape is pulled out from the cassette, and the leader (
51) and (54) move in the unloading direction, causing tape slack.

Therefore, in order to wind up the tape slack, the following configuration has been adopted.

36(A) to 36(e) show the timing of various control signals generated during unloading.
) indicates the LO^D END signal which becomes “H” when the first detection switch (130) opens, and (b) in the same figure
is detected by opening the second detection switch (131).
LO^D TOP signal which becomes H" and becomes L" when the third detection switch (132) closes, and (e) of the same figure shows a cylinder ON signal for starting the head cylinder (11), Figure (d) shows the capstan ON signal for rotating the capstan (12) in the FWD direction, and Figure (e) shows the capstan ON signal for starting the loading motor (31) in the unloading direction. It shows the load ON signal.

Further, FIG. 39 explains the program set in the system controller.

The tape winding method during unloading will be described below with reference to FIGS. 36 and 39.

When unloading from stop mode,
First, the head cylinder (11) is started, and the pinch roller (81) is released from the pressure (section T3 in Fig. 36).
, (185) to (186)) in FIG. 39 are carried out to shift to the ready mode. After that, as shown in FIG. 36(d),
After 00 and 9ee, capstan (12) is 30-5
eeRVs direction (direction in which the tape is rewound onto the supply reel)
Rotate at 1@ speed (normal speed) ((187) in the same figure),
As a result, the idler gear (112) appears as shown in Fig. 26.
Set to neutral position. Also, when unloading from ready mode, use the head cylinder (11).
After starting up, immediately turn the capstan (12) (1
87), setting the idler gear (112) to the neutral position in this way is done by the guide body (51) (
This is to allow the tape to be pulled out from both reels when the reel chassis (2) moves while the reel 54) is stopped.

Next, the loading motor (31) is activated in the unloading direction, and the reel chassis (2) is moved toward the standby mode position. After that, Fig. 36(a)
After the END signal becomes "H", rotate the capstan (12) in the FWD direction.

In this way, during the period when only the reel chassis (2) is moving (section T2 in Figure 36), the capstan (12) is stopped to prevent the tape from shifting as it is wound onto the take-up reel. It is prevented.

300m5 after the LO^D END signal becomes “H”
During the ec period (section T3 in Fig. 36), the capstan (
12) at 5x speed (Fig. 39 (188)), and then the period up to the eject mode (section T in Fig. 36).
4 and Ts), the capstan (12) is rotated at nine times the speed ((189) in the same figure), and the magnetic tape pulled out from the cassette is wound onto the take-up reel.

In this way, the leading bodies (51) (54) on the supply side and the winding side
) starts moving for a short period of time, the capstan (1
The reason why the rotation speed in 2) is set low is due to the following two reasons. In other words, the moving speed of the leading body immediately after the start of movement is the second
By engaging the first gear (71> and the second gear (74) at the pressing surface (73b) shown in FIG. 4, both gears (71) (7
4) is lower than when meshing with normal tooth surfaces,
The amount of tape slack accompanying the movement of the guide body is small at first, and then increases. Therefore, for a short period immediately after the guide body starts moving, the tape winding speed is slowed down to prevent the tape from shifting due to unloading. Also, as shown in Figure 36 (LOAD END signal is “H”)
It is unavoidable that there will be a certain amount of lag between the point in time and the point in time when each of the three leading bodies actually starts moving, and if there is a delay in the start of movement of the leading bodies, the tape may be wound at high speed from the beginning. This is because the positional shift of the tape will occur.

When the period T in Fig. 36 has passed and the unloading of the reel chassis (2) is completed, the <LO
The AD TOP signal becomes “L”.

After the LO^DT signal becomes "L", the loading motor (31) is further rotated in the unroping direction for a period of 100 seconds with the normal drive voltage (5) (Fig. 39 (190)). ), thereby unlocking the cassette holder (20).

After the jit, the loading motor (31), capstan (12), and head cylinder (11) are stopped (FIG. 39 (191)), and the procedure is completed.

As a result, the tape is smoothly pulled out at the start of unloading, and the unloading operation is performed without causing any major deviation in tape position or tape slack.

■ Tape processing method when the cylinder is stopped As mentioned above, in the stop mode, the pinch roller (81) is pressed against the cab and stun (12) without releasing the pressure.
The capstan (12) and head cylinder (11) are stopped.

This is to quickly transition from stop mode to play mode.

However, in this case, in order to smoothly start the head cylinder (11) in stop mode, it is necessary to give some tape slack to the magnetic tape between the head cylinder (11) and the capstan (12). be.

Therefore, when shifting to the stop mode, the capstan is rotated in the RVS direction for a certain period of time to intentionally loosen the tape. However, simply rotating the capstan (12) in the RVS direction will prevent the 31st
As shown in the figure, the supply reel stand (21) is rotated by the drive of the idler gear (112), causing a problem in which the tape is rewound, so the following measures have been taken.

That is, when shifting to the stop mode, first move the oscillating idler (110) to the take-up reel stand (as shown in FIG. 30).
22) Engage the side I\, and in this state start the capstan motor (13) in the r (VS direction). During the swinging period, the capstan (12) extends the tape to the head cylinder (11) ry!J, causing tape slack.

In order to realize the above operation, the following configuration is adopted.

Figure 37 (aHb) (c) shows the system controller (1
80) to the capstan motor (13) driver (
13a) I\ Shows the timing of the sent capstan ON signal and the capstan RVS signal for rotating the capstan motor in the RVS direction.

When shifting from play mode to stop mode, since the oscillating idler is already engaged with the take-up reel stand side in play mode, the capstan is moved for a period of 50 ns as shown in Fig. 37(a). , rotate in the RV S direction at 1x speed to loosen the tape.

When transitioning from CLIE (fast forward playback) mode or FF (tape fast forward) mode to stop mode, in order to make the amount of slack given to the tape the same as when transitioning from the play mode to the stop mode, ), after stopping the rotation of the capstan, the capstan (12) is rotated at 1x speed in the FWD direction for about 1 second to set the same state as in the case of (a) of the same figure. After doing so, loosen the tape using the same action as shown in Figure (a).

Also, when transitioning from REV (rewind playback) mode or REW (tape rewind) mode to stop mode,
Since the oscillating idler is engaged with the supply reel stand side, first stop the capstan, then rotate the capstan at 1x speed in the FWD direction for about 1 second, as shown in Figure 37(e). After the swing idler is engaged with the supply reel stand side, the tape is loosened by the same operation as shown in FIG.

As a result, the head cylinder can be started up smoothly even from the stop mode, that is, the head cylinder stops rotating with the pinch roller pressed against the capstan.

■ Chi-1 processing method As mentioned above, during tape loading, by pulling out the tape from both the supply reel and take-up reel, damage to the tape due to friction between the head cylinder and the tape is minimized. Ru.

However, when loading the tape, if the cassette in the holder is at the end of the tape, the tape is pulled out only from the take-up reel, which may cause damage to the tape.

Therefore, if the cassette is at the end of the tape at the start of tape unloading, the tape is rewound by the amount of tape pulled out from the supply reel associated with tape loading, and then unloading is performed. Therefore, when the cassette is removed from the VTR and then loaded into the VTR again for tape loading,
The tape will be pulled out from both wheels.

In order to realize the above operation, a program shown in FIG. 40 is set.

When an eject command is issued from the operation panel, the tape top sensor (13) and tape end sensor (136) determine whether the cassette is in the tape top state or not, and whether it is in the tape end state. be judged (Figure 40 (192) (193) (19
4)).

If both the tape top sensor and tape end sensor are ON, it is determined that the cassette is not loaded in the cassette holder, and the eject operation (see (195) in the same figure) is performed.
).

If the tape top sensor is ON and the tape end sensor is OFF, or if both sensors are OFF, the eject operation (
195).

Also, if the tape top sensor is OFF and the tape end sensor is ON, the cassette is at the tape end, so after starting the head cylinder (11), press the pinch roller (81) to the capstan (12). (Figure 40 (196)).

Thereafter, the capstan (12) is rotated for 1 second in the RVS direction at 7x speed, and the tape is rewound as described above.

Next, after stopping the capstan (12), an ejecting operation (195) is performed.

As a result, when a cassette that has recorded or played back signals up to the end of the tape is loaded into a VTR again for tape loading, the tape is pulled out from both reels of the cassette, preventing damage to the tape. be.

The drawings and the description of the above embodiments are for illustrating the present invention, and do not limit the invention described in the claims.
Nor should it be construed as limiting the scope.

Further, it goes without saying that the configuration of each part of the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the technical scope of the claims.

[Brief explanation of the drawing]

Figure 1 is a front view of the VTR according to the present invention in eject mode, Figure 2 is a right side view of the same as above, Figure 3 is a right side view of the same as above in standby mode, and Figure 4 is in play mode. Fig. 5 is a plan view showing the main mechanism of the VTR in standby mode, Fig. 6 is a plan view of the same in ready mode, and Fig. 7 is a plan view of the same as above in play mode. 8 is a plan view of the same as above, FIG. 8 is a perspective view of the VTR in play mode, FIG. 9 is a perspective view of the same as above in eject mode, FIG. 10 is a partially exploded perspective view showing the mechanism on the main chassis, Figure 11 is a partially exploded perspective view of the cylinder unit, and Figure 12 is the gear 8 driven by the loading motor! Figure 13 is a partially exploded slope view of the structure, and Figure 13 is a slope view of the oscillating idler and regulation plate.
Figure 4 is a front view of the fourth gear, Figure 15 is a perspective view of the power shaft and mode lever, Figure 16 is an exploded perspective view showing the mechanism on the reel chassis, and Figure 17 is an exploded view of the cassette holder and holder lifting mechanism. A perspective view, FIG. 18 is a plan view of the mechanism installed in the main chassis, FIG. 19 is a rear view of the mechanism installed in the reel chassis, and FIG.
The figure is a plan view of the power shaft and the mechanism connected to it in standby mode, Fig. 21 is a plan view of the same as above in ready mode, Fig. 22 is a plan view of the same as above in play mode, Fig. 23 is the same plan view in eject mode, and Fig. 24 is the 1st tII wheel and the 2nd wheel on the pressing surface.
An enlarged plan view showing the engaged state of the tII wheel, FIG. 25 is a plan view showing the pinch roller crimping mechanism in standby mode, FIG. 26 is a plan view of the same in ready mode, and FIG. 27 is play mode. 28 is a plan view of the reel stand drive mechanism in standby mode, FIG. 29 is a plan view of the same as above during loading,
Fig. 30 is a plan view of the reel stand drive mechanism and pack tension lever mechanism during normal playback in play mode, Fig. 31 is a plan view of the same during rewind playback in play mode, and Fig. 32 is a plan view of the same during rewind playback in play mode. FIG. 33 is a left side view of the holder locking mechanism in the eject mode, FIG. 33 is a left side view of the same as the above showing the unlocking operation, FIG. 34 is a left side view of the same as the above in the eject mode, and FIG. 35 is the capstan motor and Block diagram showing the control circuit of the loading motor, No. 36
The figure is a timing chart of various control signals during unloading, Figure 36A is a waveform diagram showing the driving voltage of the loading motor, Figure 37 is a timing chart explaining the tape processing method when the cylinder is stopped, and Figure 38 is a tape slack diagram. A flowchart explaining the processing method, FIG. 39 is a flowchart explaining the tape winding method during unloading, FIG. 40 is a flowchart explaining the tape end processing method, and FIGS. 4121 and 42 explain the operation of the conventional device. FIG. (92)...Puncture tension lever (110)...
・Swinging idler

Claims (1)

[Claims] [1] A reel chassis (2) equipped with a pair of reel stands (21) (22) is mounted on a main chassis (1) equipped with a head cylinder (11).
The reel chassis (
2) A recording/reproducing device is provided with a cassette holder (20) that is movable up and down and is supported by a spring in the upward direction, and is equipped with a holder lock mechanism that locks the cassette holder (20) at the lower end. At the corresponding parts of the cassette holder (20) and the main chassis (1), an engaging part and an engaging receiving part which can be engaged with each other are respectively formed, and the cassette holder (20) is locked at the lower end. When the reel chassis (2) reaches the moving end on the head cylinder (11) side, the engaging portion of the cassette holder (20) engages with the engaging receiving portion of the main chassis (1), and as a result of this engagement, Cassette holder (20) on main chassis (1)
A cassette holder mechanism for a recording/reproducing device, characterized in that a height position of the cassette holder is defined. [2] Both the engaging part and the engaging receiving part are made of metal, and by their engagement, the cassette holder (20) is electrically grounded to the main chassis (1), and the inside of the cassette holder (20) is magnetically grounded. A cassette holder mechanism according to claim 1, which is shielded.