JPS6357863B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive mechanism in a magnetic recording/reproducing device such as a VTR (video tape recorder). Generally, in a VTR, by driving a tape mounting means such as a loading disk, the tape is pulled out from the cassette and wound around a guide cylinder at a predetermined angle. It is necessary to perform a tape unloading operation in which the tape is wound into a cassette by driving. In the above case, it is desirable to mechanically synchronize the operation of the tape mounting means and the tape winding operation in order to wind the tape without slack, especially when unloading the tape. This invention has been developed in view of the above-mentioned points of the present invention, and the tape loading means and the reel stand are driven by the same drive source during the tape loading operation and the tape unloading operation, and the tape loading operation and the tape winding operation are performed using the same drive source. The object of the present invention is to provide a drive mechanism that can mechanically synchronize the picking operation with a simple mechanism. Hereinafter, an embodiment in which the present invention is applied to a cassette type VTR will be described with reference to the drawings. In the figure,
1 is a tape cassette, 2 is a tape, 3 is a chassis, 4 is a cylindrical guide cylinder, 5 is a loading disk, and 6, 6, 6 are tapes that are set on the loading disk and guide the tape 2. a guide pin, 7 a pinch roller disposed on the loading disk 5 , 8 a capstan, 9
is a fixed guide pin installed on the chassis 3 . 10, 11, and 12 are erasing, audio, and control heads; 14 is a supply reel stand consisting of a supply reel holder 14a and a supply reel pulley 14b; 15 is a take-up reel stand consisting of a take-up reel holder 15a and a take-up reel pulley 15b. be. 1
6a and 16b are drive pulleys and drive gears arranged on the drive motor 16 shaft; 17 is a first support shaft fixed on the chassis 3 ;
Levers 18 and 19 are rotatably supported while being biased counterclockwise. 18a is a protruding pin that protrudes from one end of the first lever 18 ; 18b is a first intermediate gear that is also supported by the other end of the first lever 18 and can mesh with the driving gear 16b; A second intermediate gear disposed coaxially with the first intermediate gear, 20a is a third intermediate gear disposed on the first support shaft 17 and always meshes with the second intermediate gear 18c, and 20b is the third intermediate gear. A fourth intermediate gear is arranged coaxially with the third intermediate gear, 19a is a protruding pin that protrudes from one end of the second lever 19 , and 19b is the second intermediate gear.
A fifth intermediate gear 19c supported by a bent portion on one end of the lever 19 and constantly meshing with the fourth intermediate gear 20b is a first pulley disposed coaxially with the fifth intermediate gear. Reference numeral 21a represents a loading disc drive gear that meshes with the gear portion 5a on the outer periphery of the loading disc 5. Reference numeral 21b represents a second pulley disposed coaxially with the loading disc drive gear. A first belt 22 is stretched between the pulley 19c and the pulley 19c. 23 is a back tension lever that is equipped with a back tension pin 23a at the tip and applies back tension to the tape 2; 24 is a second support shaft that rotatably supports the back tension lever; 25 is the same; Second
The back tension lever 23 is supported by a support shaft and has a recess 25a at one end, and is secured to the back tension lever 23 by a fixing screw 26.
The engagement lever 27 has a through hole 27a at one end into which the second support shaft 24 is loosely fitted, and an engagement pin at the bent portion that engages with the recess 25a of the engagement lever 25. 27b, and the first L-shaped lever and the engagement lever 25 are connected via a back tension spring 28 and are biased in opposite directions about the second support shaft 24. There is. 2
9 has one end connected to the bent portion of the first L-shaped lever 27 , and the other end connected to the chassis 3 via a pin 29a.
A first link 30 is loosely fitted into the through hole 3a and has its other end surface in sliding contact with the inner circumferential surface 5b of the loading disk 5 ; The sliding link biasing spring 31 is a back tension band, one end of which is connected to the engagement lever 25 , and after being wound about half a turn around the supply reel holder 14a of the supply reel base 14, the other end is connected to the engagement lever 25. is connected to a fixed piece 32 on the chassis 3 . 33, 34, and 35 are the third, fourth, and fifth support shafts set on the chassis 3 , and 36 is the third support shaft.
It is rotatably supported on a support shaft, and has protrusions 36a at both ends.
an engagement release lever 36b that is capable of coming into contact with and separating from one end of the first L-shaped lever 27 ; 37 is pivotally supported by the fourth support shaft 34 ; Engagement roller 3 that engages with a notch (not shown) upon completion of contact loading
7a is a substantially dogleg-shaped loading completion detection lever; 38 is a second L-shaped lever also pivotally supported by the fourth support shaft 34, and has protrusions 38a+3 at both ends;
8b. 39 is the third and fifth support shaft 35, 3
5 is a first slide lever provided with elongated holes 39a and 39b into which they are loosely fitted, and a locking protrusion 39c at one end,
One protrusion 38a of the second L-shaped lever 38 is in contact with the locking protrusion, and the second lever 19 is in contact with the other end.
The protruding pin 19a of a comes into contact. 40 Elongated holes 40a and 40b that overlap with the first slide lever and into which the third and fifth support shafts 33 and 35 are loosely fitted, respectively.
and a second slide lever having a locking piece 40c in the middle, one end of which is connected to the other end of the loading completion detection lever 37 , and the other end of which is brought into contact with the protruding pin 18a of the first lever 18. The first and second
The slide levers 39 and 40 are each biased toward the right in the figure. 41 is a bent piece 41 whose tip engages with the other protrusion 38b of the second L-shaped lever 38 ;
42 is a cassette lock mechanism that unlocks the cassette holder in conjunction with the ejector operation, and SW is the cassette lock. A switch 43 that controls the energization of the drive motor in conjunction with the mechanism has an engagement roller 43a at one end that slides into contact with the lower surface of the loading disk 5 , and the other end abuts against the cassette lock mechanism 42 for unloading. This is a lock holding lever that maintains the locked state at all other times. Reference numeral 44 denotes a sixth support shaft 45 installed on the chassis 3 , which is rotatably supported by the sixth support shaft and has through holes 45a and 45b at both ends.
It is a 3L-shaped lever, and a pin 46 connected to a solenoid (not shown) that operates in conjunction with the play operation is loosely fitted into a through hole 45a at one end. 47
48 is the first idler; one end thereof is the sixth support shaft 44;
a first idler support lever 49 supported by the first idler supporting lever at the other end and biased counterclockwise;
is a third slide lever having one end loosely fitted into the through hole 45b at the other end of the third L-shaped lever 45 and the other end loosely fitting into the seventh support shaft 50 on the chassis 3 , and a through hole 49a in the middle part. A first abutting piece 49b that abuts the other end of the first idler support lever 48 on the side, and a second abutting piece 49c that abuts the protrusion 36b at the other end of the disengagement lever 31, which will be described later. It is provided with a third contact piece 49d that the brake lever comes into contact with, and is urged rightward in the figure. 51 has pins 51a, 51 on both wings
b is provided, and the central portion is pivotally supported on the chassis 3 by an eighth support shaft 52. One pin 51a is in contact with the locking piece 40c of the second slide lever 40 , and the other pin 51a is in contact with the locking piece 40c of the second slide lever 40 The pin 51b is loosely fitted into the through hole 49a of the third slide lever 49.
53 has one end connected to the center part of the T-shaped lever,
A second link having a through hole 53a at the other end, 54 a second idler that is pressed against the supply and take-up reel pulleys during rewinding and fast forwarding, respectively, and held at a neutral position at other times; 55 a rotating shaft at one end; The second idler is supported via 56 and the second idler
It loosely fits into the through hole 53a of the link 53 , and the through hole 5 is attached to the other end.
The second idler support lever 5a is provided with a slip mechanism made of felt or the like (not shown) in conjunction with the second idler 54. 57
is a third support shaft installed on the chassis 3, and the through hole 55 of the second idler support lever 55 is inserted into the third support shaft.
a is fitted, and the fourth lever 59 is biased toward the bracket 58 and the second idler support lever.
is supported at one end. 60a is a roller that is supported by the ninth support shaft 57 and comes into pressure contact with the second idler 54; 60b is a roller that is also supported by the ninth support shaft 57, has the same diameter as the roller, and is in contact with the first idler 47; The third pulley 60c, on which the second belt 61 is stretched, is also a fourth pulley that is rotatably supported on the ninth support shaft 57 and between which the third belt 62 is stretched. . 63a, 63
b is a fixing screw that fixes the bracket 58 on the chassis 3 ; 65 , 65 are rotatably supported by the fixing screw, and are connected to the supply and take-up reel pulleys 14, respectively;
A supply reel and take-up reel brake lever 66 is connected between both brake levers and is attached in the compression direction of each reel pulley. A brake spring 67 is rotatably supported by one of the fixing screws 63a, and applies light braking to the supply reel holder 14a only during fast forwarding or rewinding. The third slide lever 4 is a load brake lever.
A pin 67a that can come into contact with the third contact piece 49d of No. 9 is provided. Reference numeral 68 denotes an L-shaped brake release lever supported by a tenth support shaft 69 installed on the chassis 3, and one end of which is connected to the brake 6 for the supply and take-up reels.
A brake release pin 68a is provided which contacts the long pieces 64a and 64b of 4 and 65 , and a brake release solenoid 70 is also connected thereto. Next, the operation in each operation mode of the apparatus of the present invention having the above-described configuration will be explained. First, the loading start state will be explained with reference to FIG. First, when the cassette holder (not shown) on which the cassette 1 is attached is pushed down, the cassette holder is locked by the cassette lock mechanism 42, and at the same time, the switch SW is turned on and the rotation shaft of the drive motor begins to rotate clockwise. In this state, the loading completion detection lever 3
The engagement roller 37a of 7 is the loading disc 5
Since the second slide lever 40 is in contact with the outer peripheral surface of the drive gear 1b, the second slide lever 40 is pulled to the left, and the first lever 18 , which is in contact with the other end, is rotated counterclockwise. The first intermediate gear 18b meshes with the first intermediate gear 18b. Therefore, the rotation of the drive motor 16 is caused by the drive gear 16b, first, second, third, fourth and fifth intermediate gears 18b, 18c, 20a, 20b, 1
9b, first pulley 19c, first belt 22, second
The signal is transmitted to the gear portion 5a of the loading disc 5 via the pulley 21b and the loading disc drive gear 21a, and the loading disc 5 rotates counterclockwise. Loading disk 5
The rotation of the roller 43 of the lock holding lever 43
a is removed from a notch (not shown) on the lower surface of the loading disk, the lock holding lever rotates clockwise, and the cassette locking mechanism 42 is held locked. At this time, the solenoid 70 is operated by the locking of the cassette lock mechanism 42 , the brake release lever 68 is rotated clockwise, the brake release pin 68a is moved downward in the figure, and the supply and take-up reel brake lever 64 , 65 is brought into a brake release state against the bias of the brake spring 66. Furthermore, a light load lever brake 67 is in contact with the supply reel holder 14a to apply light braking, and a belt to a counter pulley (not shown) is stretched over the take-up reel holder 15b. The same load is applied to both reel stands. Then, the pinch roller 7 tape guide pins 6, 6, 6 of the loading disc 5 start pulling out the tape 2, and at the same time, the sliding link 29 that was in contact with the inner circumferential surface of the loading disc 5 on the inclined part 5c , and moves upward in the figure, so that the engagement lever 25 , which is integrated with the first L-shaped lever 27 and the back tension lever 23 , moves upward in the figure.
Rotating clockwise around the support shaft 24, the back tension pin 23a pulls out the tape 2 upward in the figure. The tape 2 is therefore connected to the supply and take-up reels 14 ,
15 without slack, and is wound around the cylindrical guide cylinder 4. During loading, the engagement lever 2
5 and the first L-shaped lever 27 are given a rotational moment in the opposite direction about the second support shaft 24 by the biasing spring 28 for back tension, but the recess 25a of the engagement lever 25 Since the first L-shaped lever 27 and the engagement pin 27b are engaged with each other, mutual rotation is restricted, and the biasing force of the back tension spring 28 is restricted. Therefore, the load applied to the loading disk 5 is transferred to the sliding link 29.
The load applied to the loading disk 5 is due to the biasing force of the spring 30 that lightly presses the sliding link 29 against the loading disk and the back tension pin 2.
Only the tape tension is applied to 3a, making it relatively light. On the other hand, the rotation of the drive motor shaft 16 is transmitted to the fourth pulley 60c via the third belt 62, causing the roller 60a, the third pulley, and the first idler 47 to rotate together.
1a is the locking piece 40 of the second slide lever 40
Since the T-shaped lever is rotated counterclockwise, the second link 53 is moved upward, and the second link 53 is moved upward, and the second link 53 is moved upward. As shown in the figure, the rotation shaft 56 of the second idler 54 is pulled to the left in the figure and is held at the end of the through hole 53a of the second link 53, so that
The idler 54 and the roller 60a are in a state separated from each other, and the rotation of the fourth pulley 60c is not transmitted to the second idler, so that the two idlers are held at a neutral position. When the above-mentioned loading operation is completed, the loading completion detection lever 37 is activated as shown in FIG.
The engagement roller 37a engages with a notch (not shown) in the loading disk 5, the loading completion detection lever rotates clockwise, and a detection switch (not shown) is activated to stop the drive motor. As a result, the second slide lever 40 slides to the right, rotates the first lever 18 in contact with the other end slightly clockwise, and separates the first intermediate gear 18b from the drive gear 16b, thereby performing loading. The drive of the disk 5 is stopped. At the same time, the solenoid 70 is deenergized, and the supply and take-up reel brakes 64 and 65 are pressed against the supply and take-up reel pulleys 14b and 15b, respectively, and the stopped state is maintained. Further, in this state, the engagement between the engagement lever 25 and the first L-shaped lever 27 is maintained, and the back tension lever 2
3 is in a fixed state. Next, play (record or play) from this stopped state
When the operation is performed, the solenoid 70 is energized and the supply and winding brake 6 is activated as shown in FIG.
4, 65 is released and the third L-shaped lever 4
The third L-shaped lever is rotated counterclockwise by the urging of a solenoid (not shown) connected to 5.
A third slide lever 49 connected to the third L-shaped lever slides to the right. The first contact piece 49b is separated from the first idler support lever 48 by the sliding of the third slide lever, and the first idler support lever is rotated counterclockwise by the biasing force of the spring, and the first idler support lever 47 is moved away from the first idler support lever 48. is brought into pressure contact with the take-up reel holder 15a. Therefore, the counterclockwise rotation of the drive motor is caused by the third belt 62, the fourth pulley 60c, and the third belt 62, the fourth pulley 60c, and the third
It is transmitted to the second idler 47 via the pulley 60b and the second belt 61, and the take-up reel 15 rotates clockwise to wind up the tape 2. At the same time, the light load brake lever 67 is rotated clockwise by the third contact piece 49d to release the brake on the supply reel holder 14a. Further, the rightward movement of the second abutment piece 49c presses the protrusion 36b of the third lever 36, causing the third lever to rotate counterclockwise, and the protrusion 36a at the other end to move toward the first L-shape. Press one end of the shaped lever 27 . As a result, the first L-shaped lever moves to the left, the engagement with the recess 25a of the engagement lever 25 is released, and the back tension lever 23 becomes freely rotatable and becomes operational. Furthermore, as the third slide lever 49 slides to the right, the pin 51b of the T-shaped lever 51 that is loosely fitted into the through hole 49a moves to the right, and the T-shaped lever rotates counterclockwise to move the second slide lever 49 to the right.
The link 53 is pulled upward to separate the second idler 54 from the roller 60a and hold the second idler in the neutral position. When a stop operation is performed from this brake mode, the stopped state shown in FIG. 2 is restored again. Next, referring to FIG. 4, a description will be given of the case where a fast-forward operation is performed from the stopped state shown in FIG. 2, or the case where a forward picture search is performed by bringing the video head into contact with the tape in the fast-forward state. The rapid forward operation energizes the solenoid 70 and releases the supply and take-up reel brakes 64 and 65 . Then, the rotation shaft 16 of the drive motor rotates clockwise,
This rotation is caused by the third belt 62, the fourth pulley 60c, and the second belt that is in pressure contact with the roller 60a.
The second idler rotates counterclockwise. At the same time, the second idler support lever 55 that supports the second idler is rotated clockwise by a slip mechanism (not shown) to press the second idler against the take-up reel pulley 15b, causing the take-up reel 15 to rotate clockwise. The tape 2 is wound up at high speed by rotating the tape in the direction shown in FIG. On the other hand, in this fast-forward state, the solenoid (not shown) connected to the third L-shape 45 is consumed, and the third slide lever 49 is at the same position as in the stopped state in FIG.
The first idler 47 is spaced apart from the take-up reel pedestal 15a, and the light-load brake 67 is pressed against the supply reel pedestal 14a to prevent the tape 2 from sagging. Furthermore, since the disengagement lever 36 is also in the same position as in the stopped state, the rotating lever 25 and the first L-shaped lever 27 are in the engaged state. Therefore, the back tension lever 23 is in a fixed state, and the winding angle of the tape 2 around the cylindrical guide cylinder 4 remains constant despite fluctuations in the tape tension. When rewinding or performing a picture search in the reverse direction, the rotation of the drive motor is reversed to that during fast forwarding, the second idler 54 is pressed against the supply reel pulley 14b, and the tape 2 is rewound at high speed. Finally, the fifth section regarding the operation during unloading.
This will be explained with reference to the figures. First, the eject lever 41 is pulled downward by the eject operation, the bent piece 41a presses the protrusion 38b of the second L-shaped lever 38 , and the second L-shaped lever is rotated counterclockwise. Slide the first slide lever 39 that comes into contact with the protrusion 38a to the left. On the other hand, since the loading completion detection lever 37 is configured to follow the counterclockwise rotation of the second L-shaped lever 38 , it also causes the second slide lever 40 to slide to the left. This leftward sliding of both slide levers causes the first and second levers 18 and 19 , which are in contact with the other ends of both slide levers, to rotate counterclockwise, respectively. As a result, the first intermediate gear 18b meshes with the drive gear 16b and the first pulley 19
c comes into pressure contact with the take-up reel pulley 15b. Further, the drive motor rotates clockwise in conjunction with the engine operation, and at the same time, the solenoid 70 is energized and the supply and take-up reel brakes 64 and 65 are released.
Due to the clockwise rotation of the drive motor, the loading disk 5 is rotated clockwise in the opposite direction to that during loading, and the take-up reel pulley 15b is rotated clockwise, so that the tape 2 is prevented from slacking. It is wound onto the take-up reel stand 15 without applying too much tension. Further, at this time, a light load brake 67 is pressed against the supply reel pedestal 14a. In addition, as the second slide lever 40 slides to the left, the T-shaped lever 51 rotates counterclockwise, pulling the second link 53 upward and separating the second idler 54 from the roller 60a to the neutral position. Hold. Furthermore, back tension lever 2
3, the engagement lever 25 is fixed by engagement with the first L-shaped lever 27 , and the sliding link 29 slides on the inner peripheral surface of the loading disk and is guided to the inclined portion 5c. It is then rotated counterclockwise and guided into the cassette. At this time as well, only the same load as at the time of loading described above is applied to the loading disk 5 . When the loading disk 5 rotates to a predetermined position, the roller 4 of the lock holding lever 43
3a engages with a notch (not shown) on the lower surface of the loading disk, and the lock holding lever rotates counterclockwise to release the cassette lock mechanism 42 from the locked state. The cassette locking mechanism unlocks a cassette holder (not shown) by urging a spring connected to the ejector lever 41 , and raises the cassette holder together with the cassette 1 to return to the cassette loading/unloading position. In conjunction with the start of the cassette holder's rise, the switch SW is turned off, the power supply to the drive motor and solenoid 70 is cut off, and all operations are stopped. As described above, according to the present invention, it is possible to mechanically synchronize the drive of the tape mounting means and the reel stand when the tape mounting is released using a simple mechanism, so that the tape mounting means and the reel stand can be mechanically synchronized without applying excessive force to the tape. It is also practical because it can be wound up without sagging.

[Brief explanation of the drawing]

The drawings all relate to one embodiment of the present invention.
2 is a plan view of the mechanism of the present invention in the loading start state, FIG. 2 is a plan view of the same stopped state, FIG. 3 is a plan view of the same play state, FIG. 4 is a plan view of the same fast forward state, and FIG. A plan view of the same unloading state,
FIG. 6 is a sectional view taken along line A-A' in FIG. Explanation of main drawing numbers, 5... Tape loading means (loading disk), 15... Reel stand (take-up reel stand), 16, 16a, 16b... Drive source (drive motor, drive pulley, drive gear , 18...first
Rotating member (first lever), 19... Second rotating member (second lever), 18b, 18c... First rotating body (first intermediate gear, second intermediate gear), 19b, 19c
...Second rotating body (fifth intermediate gear, first pulley),
20a, 20b...Intermediate rotating body (third intermediate gear,
4th intermediate gear), 21a, 21b, 22... transmission means (loading disk drive gear, 2nd
pulley, first belt), 39... second operating member (first slide lever), 40... first operating member (second slide lever).

Claims (1)

[Scope of Claims] 1. In a magnetic recording and reproducing device in which a reel stand and a tape mounting means are driven by the same drive source, first and second rotating members each coaxially supported; a first rotating body disposed on one rotating member and detachable from the drive source; a second rotating body disposed on the second rotating member and detachable from the reel stand; The first rotating member is arranged coaxially with the second rotating member.
an intermediate rotating body that constantly connects the rotating body and the second rotating body; means for transmitting the rotation of the second rotating body to the tape mounting means; and a first operating member that engages with the first rotating member. , a second operating member that engages with the second rotating member, and when the tape is loaded, the first rotating body and the drive source are engaged by the operation of the first operating member, and the tape is loaded. When released, the first rotating body and the drive source engage with each other and the second rotating body and the reel stand engage with each other due to the operation of the first and second operating members. Drive mechanism of recording/reproducing device.