JPH02236851A - Magnetic tape driving device - Google Patents

Abstract

PURPOSE:To keep stable contact between a magnetic tape and a head and hence to obtain a stable signal output even at the transition time of the tape transfer state from the forward direction to the backward direction by oscillating forcibly an oscillatory idler gear with external power. CONSTITUTION:At the transition time from the forward transfer state to the reverse transfer state, first of all, a capstan motor 2 is stopped and a mode changeover motor 3 is rotated clockwise. Then, the motor 2 is reversely rotated after moving forcibly the idler gear 7 from the right side of an idle gear 8t to the left side of an idle gear 8S via a relay gear and a cantilever 30. Consequently, a reel base 9S is rotatively driven via a gear 8S immediately upon the reverse rotation of the motor 2, and the magnetic tape 10 can undergo the transition to the reverse tape transfer state keeping in stable contact with the head without lowering its tension due to an on/off operation of a pinch roller 4.

Description

[Detailed description of the invention]

[Industrial Field] This invention relates to a magnetic tape drive device such as V 1'R. [Prior Art] In Fig. 4, (1) is a tape guide drum having a rotating head (not shown), (2) is a cab stan motor, and its main shaft (2a) and pinch roller (4) are used to generate magnetic It rotates with the tape (10) in between and transfers the magnetic tape (10). In addition, a boule (
2b), the reel stand (9g) is passed through the belt (5).
．． (9t.) to transmit rotational power. (5) is a boot that rotates around a rotating shaft (6a) fixed to a body (not shown), and meshes with a swinging idler gear (7) to transmit power to a gear (6b). ), the rotational power from the gear (6b) is transferred to the idle gear (8s). (This is an oscillating idler gear that transmits transmission to the 8tl, and is installed so that it rotates with a slight rotational friction loss around the rotating shaft (7a) fixed to the arm (7c) that rotates around the rotating shaft (6a). (8s) and (8t) are the rotating shafts (8sa) and (8st) fixed to the housing, respectively.
), and the rotational power of the idler gear (7) is transmitted to the reel stand (9s). (This is the idle gear that transmits to the 9tl. This reel stand (9s)
, (9t) is the rotating shaft (9sa) fixed to the body.
)． (9ta), and a reel hub (Is) with the width of the tape cassette (11). (ll
t) and reel hub (Its). Rotate the eyes. (lO) is a magnetic tape. (
10s). (lOt) is the reel hub (lOt), respectively.
Is). This is a magnetic tape wound on (II). (4) is a vinyl roller that transfers a magnetic tape (10) between it and the main shaft of the cab stan motor {2a}, and the plate is rotatably supported around a shaft (4a) fixed to the body. (4c) Rotates around the shaft (4b) fixed to l. In addition, (4e) is a cam-shaped lower lever, which is rotatably supported by the shaft (4a), rotates clockwise along the cam surface of the outer cam (15b) provided on the outer periphery of the relay gear (l5), and is rotated clockwise by the spring { 4d} and plate (4C)
The pinch roller (4) is pressed against the cab stan motor main shaft (2a) by generating a torque to rotate the magnetic tape (lO) clockwise, thereby generating a frictional force for transporting the magnetic tape (lO). (3) is a mode-switchable river motor that generates power for crimping the pinch roller (4).
The rotational power of This is transmitted to the relay gear (15), which further rotates the cam-shaped lower lever (4c) via the outer cam (+5b). (20) is a magnetic tape (
A plurality of tape guide drums (10) are provided between both reels and the tape guide drum (+) so as to guide the running of tape guide drum (+). (
l! ) is a tape cassette that winds up a magnetic strip (!0), stores it, and places it on a reel stand (9s). Reel hub (I) with a coupling that receives rotational power from (9L)
Is). (lit) and magnetic tape (!0)
It is equipped with a guide bin or roller (lla) for guiding. Next, the operation will be explained. While the tape is being transferred in the forward direction, the carbstan motor (2) rotates counterclockwise, and the carbstan motor main shaft (2a) and pinch roller (4) move the magnetic tape (10) by the arrow (2N).
), and then pull the magnetic tape (
Transfer while pulling out the IO). At the same time, the pulley (2b) under the shaft of the cab stan motor (2) rotates counterclockwise, causing the pulley (5) to rotate counterclockwise via the bell i (5). Since the idler gear (7) has some rotation loss around the rotating shaft (7a), the oscillating idler gear (7) is affected by the force of rotating counterclockwise around the shaft (6a). The idler gear (7) engages with the idler gear (8t). Automatically swings to transmit rotational power. After that, swinging idler gear (7)
rotates clockwise about the shaft (7a), causing the idle gear {8L} to rotate counterclockwise. Furthermore, the idle gear {8shi} rotates the reel stand (9t) clockwise, and the reel hub (IIL) coupled to the reel stand (9L) also rotates clockwise. In this way, the cab stan main shaft {2a} and the pinch roller (4
) The magnetic tape (10) transferred by the guide bin (20), the guide bin in the cassette, and the roller (Ila)
While the tape is being transported in the reverse direction, the cab stan motor (2) rotates in the opposite direction along the same route as the tape forward direction described in F, and the oscillating idle gear ( 7) is a relay idol gya (8)
s) to rotate the reel hub (IIs) counterclockwise, and the reel hub (IIs) is pulled out from the reel hub (IT) by the cab stan motor main shaft (2a) and the pinch roller (4), and the reel hub (IIs) is pulled out from the reel hub (IT) by the arrow (2 1 r ) is wound up. During the transition from the forward direction tape transport state to the reverse direction tape transport state, as shown in FIG. The cab stan motor (2) rotating in the counterclockwise direction is stopped, and then from time L2 to t,
Rotate the mode switching motor (3) clockwise until the pinch roller (4) is pressed against the cab stun main shaft (2a) with a force of L (OFF state), and then set the time. Rotate the carburetor stan motor (2) slightly in the opposite direction (clockwise) until it reaches 6, and then turn the idle gear (reverse).
The oscillating idler gear (which transmitted power in contact with
7) to the idle gear (8s), and then set the time under this condition. Rotate the mode switching motor (3) counterclockwise until the pinch roller (4) is pressed against the cab stan motor main shaft (2a),
Next, rotate the cab stan motor (2) in the reverse direction (clockwise) to move the tape in the reverse direction. Here, during the transition from the forward tape running state to the reverse tape running state, the pinch roller (4) is moved to the cab stan motor main shaft (
The reason for removing it from 2a) is that if the carburetor stan motor (2) is rotated in the opposite direction with the pinch roller (4) still attached, the oscillating idler gear {7} will separate from the idler gear (8). Until I met Idol Gya (8s). From the pinch roller (4), remove the magnetic tape (
10), but on the other hand, the reel stand (9s) cannot perform the winding operation and the magnetic tape (10) becomes largely slack. [Problems to be Solved by the Invention] As described below, in the conventional tape drive traveling device, when transitioning from the forward direction tape transport state to the reverse direction tape transport state, the pinch roller (4) is moved to the main shaft of the cab stan motor. (2a
), and at this time, due to the difference in the length of the tape running path, the tape will slacken slightly, reducing tape tension and making it impossible to obtain stable contact with heads such as rotating magnetic heads. , normal signal output cannot be obtained. Also, remove the pinch roller (4) and dry the cab stan.
Since the magnetic tape (2) is rotated in the opposite direction, depending on the timing, there is a risk that the reel stand (8s) may wind up an excessive amount of magnetic tape.
When it is desired to move the magnetic tape in the opposite direction, for example, when performing reverse frame-by-frame feeding, there is a problem in that it is almost impossible to control the running of the magnetic tape. This invention was made to solve the problems mentioned in -V. It is possible to accurately control the running of the magnetic tape without removing the pinch roller from the main shaft of the cabstan, and to reduce the tape tension during switching. It is an object of the present invention to provide a tape running drive device which can obtain stable signal output by obtaining stable contact between a magnetic head and a magnetic tape without causing a drop in performance. [Means for Solving the Problems] A tape running drive device for a magnetic recording/reproducing device according to the present invention uses a swinging idler gear to rotate a cab stan motor when transitioning from a forward tape transport state to a reverse tape transport state. It is characterized by having a means for forcibly swinging the head using other power regardless of the situation.

[Effect] The forced swinging means in this invention forcibly swings the automatic swinging idler gear using external power. Therefore, there is no need to remove the pinch roller from the main shaft of the cab stan motor to perform swinging motion, so even when transitioning from the forward direction tape transfer state to the reverse direction tape transfer state, it is possible to accurately control the cab stan motor by simply controlling the pinch roller. Tape transfer control can be performed. In addition, there is no decrease in tape tension, stable contact between the magnetic tape and the head is maintained, and stable signal output can be obtained. [Embodiments of the invention]

Embodiments of the invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the overall configuration of this embodiment, and the same components as those of the conventional example shown in FIG. 4 are given the same reference numerals, and detailed explanation thereof will be omitted. In the figure, 《16》 is a relay gear that transmits the power from the mode switching motor (3) to the rotary oscillating force arm (17).
It rotates around a rotating shaft (16a) fixed to a body (not shown). (17) is a rotary rocking arm that rotates around a rotating shaft (lea) fixed to the body, and has a gear on its outer periphery that meshes with the relay gear (16), and a lever (
The lever {I8} is equipped with a cam groove (+7bl) that engages with and swings the cam lower (18b) installed at one end of the lever {I8}, and the lever {I8} rotates around the shaft (18a) fixed to the housing. It makes a rocking motion along the cam groove (+8b). (31) is a plate cam, which has a long size (3 lb) that engages with the hole raised (18c) planted at the other end of the lever (18). ,
Chodai (31s). At (31L), the shaft (8sa) is fixed to the housing. (8La) and slides. The plate cam (31) also includes a cam (31a) that engages with a cam lower (30b) provided at one arm end of the cantilever (3o) to swing the cantilever (30). In addition, the cantilever (30) rotates around a shaft (30a) fixed to the cantilever body, and the long arm (30c) provided at the other end of the arm is connected to the swinging idler gear (7).
) are simultaneously engaged with the rotating shaft (7a). Figure 2 shows the cam plate (3l) and cantilever (30) of the embodiment shown in Figure 1.
) is an enlarged view for explaining the operation. Next, the operation of configuration 1-1 will be explained. When transitioning from the forward direction tape transport state to the reverse direction tape transport state, the mode switching motor (3) is rotated in the hour AI direction. Then, the relay gear (+4), (
+5). (16) rotates the rotary oscillating arm (17) clockwise. At this time, since the cam lower (+8b) is fully engaged with the cam (+7b), the lever (18) is not fully engaged with the cam. +VNl7bl along axis (18a)
The plate cam (31) rotates counterclockwise around the center, and the protrusion (18c) engaging with the elongated hole (3lb) of the plate cam (31) moves the plate cam (3l) to the right. Along with this, the cam surface (31a) of the plate cam (31) comes into contact with the cam flange lower (30b), and the swing lever (30)
Rotate counterclockwise. As a result, the oscillating idler gear (7) is forcibly transferred toward the idler gear (8s), engages with the idler gear (8s), rotates the reel stand (9s) counterclockwise, and rotates the magnetic tape. Rewind {IO}. Next, when the mode switching motor (3) is rotated counterclockwise, the rotary oscillating force (17) also rotates counterclockwise, and the plate cam (31) slides to the left to return to its original state. Return to forward tape transport state. By the way, during the transition from the forward direction tape transport state to the reverse direction tape transport state, as shown in FIG.
The cab stan motor {2} is then stopped, and the mode switching motor (3) is then rotated clockwise from time t2 to t3. At this time, as described in 1111, the oscillating idler gear (7) is moved from the right side idler gear (8L) to the leftmost idler gear (8L) between 2 and t3.
s) side. After that, the cab stan motor (2) is rotated in the opposite direction from time t4, but since the oscillating idler gear (7) is already in contact with the left idle gear (8s), the cab stan motor (2) is rotated in the opposite direction from time t4. Immediately upon the reverse rotation of
The reel stand (9s) is rotationally driven via the idle gear (8s). As a result, the magnetic tape {10} transitions to the tape transport state in the reverse direction while maintaining stable contact between the magnetic tape (!0) and the head without decreasing the tape tension due to the ON/OFF operation of the pinch roller (4). do. In the above embodiment, the mode switching motor (3) forcibly moves the d-swing idler gear (7), but the same effect can be obtained by driving the cantilever (30) with a plunger or the like. It will be done. [Effects of the Invention] As described above, according to the present invention, when transitioning from the forward tape transport state to the reverse tape transport state, the oscillating idler gear (7) is forcibly activated by external power. Since the pinch roller (4) is made to swing, there is no need to separate the pinch roller (4) from the cab stan motor main shaft (2a) and perform the swinging motion separately. There is no drop in tension, and stable contact between the magnetic tape and the head can be maintained even during transitions in the tape transport direction. Furthermore, since there is no need to separate the pinch roller {4} from the cabstan motor main shaft (2a), the cabstan motor can be There is an effect that the amount of tape movement can be easily controlled simply by performing the rotation control in (2).

[Brief explanation of drawings]

FIG. 1 is a diagram showing the overall configuration of a tape running drive device according to an embodiment of the present invention, FIG. 2 is an enlarged view of the main parts of FIG. 1,
FIG. 3 is a timing diagram showing the operation when switching the tape running direction in this embodiment, FIG. 4 is a diagram showing the overall configuration of the tape running drive device of a conventional magnetic recording/reproducing device, and FIG. FIG. 4 is a timing diagram showing operations when switching the tape running direction. (1)...Tape guide drum, (2)...Cab stan motor, (3)...Mode switching motor, (4)
...Pinch roller, (7)...Idle gear, (8)...Idle gear, (9)...Reel stand, (10)...Magnetic tape. (II)...
Cassette, (17}...Rotating rocking arm, (18)...
・Lever, (30)...Cantilever (3l)...
・Plate cam. Note that in each figure, the same symbols represent the same or equivalent parts.

Claims (1)

[Claims] (1) In a magnetic tape drive device that guides a magnetic tape pulled out from a cassette so as to wrap it around the circumferential surface of a tape guide drum, and runs the magnetic tape in forward and reverse directions, a capstan that runs the magnetic tape is used. a magnetic tape winding means including an oscillating idler gear that is driven by a motor and engages with a take-up reel stand or a rewind side reel stand to rotate; A magnetic tape drive device comprising a drive means for forcibly moving the oscillating idler gear toward the rewind side reel stand when switching.