JPH0636263B2 - Magnetic tape device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention draws out a magnetic tape from a tape cassette having an opening on the front surface, and causes the magnetic tape to be attached to a magnetic head installed outside the tape cassette at a predetermined angle for running. The present invention relates to a magnetic tape device such as a VTR for recording / reproducing signals.

Configuration of Conventional Example and Problems Thereof In general, in a magnetic tape device such as a cassette type video tape recorder, a first position where the magnetic tape can be pulled out from an opening of the tape cassette and the magnetic tape is pulled out of the tape cassette. It has a magnetic tape pull-out means that reciprocates between a second position which can be attached to the magnetic head, and in particular, in order to perform accurate signal recording / reproduction between the magnetic tape and the magnetic head at the second position. In order to enhance the stop position accuracy of the second position for accurately determining the winding angle of the magnetic tape with respect to the magnetic head and to fix the magnetic tape stably, the stopper is arranged at the second position, and the magnetic tape pull-out means is provided with an elastic member. It is carried out by pressing and fixing it by such as. However, in order to press the magnetic tape pull-out means against the stopper, usually a considerably large force is required,
For this reason, there was a problem that a motor with a large output was required and current consumption also increased. On the other hand, for determining the position of the magnetic tape pull-out means at the first position,
Generally, a method of improving the mechanical accuracy of the constituent parts of the magnetic tape drawing means or a method of providing a detent means in the magnetic tape drawing means is adopted. However, these methods have a problem that it is difficult to stabilize the position at the first position due to variations in the components and backlash of the drive unit of the magnetic tape pull-out means. Therefore, when the tape cassette is mounted on the device, the magnetic tape pulling-out means does not smoothly enter the opening of the tape cassette, but abuts on the wall forming the opening of the tape cassette to damage the tape cassette and the magnetic tape pulling-out means. Serious accidents such as giving or damaging the magnetic tape by coming into contact with the magnetic tape are likely to occur.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks, and it is an object of the present invention to reduce the current consumption of a motor and prevent damage to the tape cassette, the magnetic tape pull-out means, and the magnetic tape.

To achieve the above object, the magnetic tape device of the present invention comprises:
A tape cassette having a reel hub around which a magnetic tape is wound and having an opening at the front is used, and the magnetic tape is pulled out from this cassette using a pair of guide posts and attached to a magnetic head installed outside the tape cassette. The magnetic tape in the tape cassette is pulled out from the opening, and the magnetic tape is pulled out of the tape cassette and attached to the magnetic head. A magnetic tape pull-out means having a pair of guide posts that reciprocate between a second position for obtaining the magnetic tape, a fixing member for determining the positions of the magnetic tape pull-out means at the first position and the second position, and the magnetic tape. With the reciprocating movement of the pull-out means between the first position and the second position, the same elastic body is used and the magnetic tape is used. A biasing force is applied to the feeding means at the first position in the direction of the fixing member at the first position, and a biasing force at the second position in the direction of the fixing member at the second position. It was done.

Description of Embodiments An embodiment of the present invention will be described below with reference to the drawings. 1 and 3 are top views of this embodiment. In the figure, a take-up reel stand (10) and a supply reel stand (12) which are respectively rotatably fitted onto shafts (4) and (6) that are set up on the upper surface of a substrate (2).
When the cassette (20) is mounted at a predetermined position of the apparatus body, the cassette (20) is engaged with the take-up reel hub (14) and the supply reel hub (16) in the cassette (20), respectively, and the reel bases (10), ( It can be rotated integrally by a claw (8) provided on the (12). FIG. 2 shows a sectional view of the reel base drive system. The take-up reel base (10) and the supply reel base (12) have reel gears (30) and (40), respectively. , (40) are axes (50) that can be set up on the substrate (2)
The take-up reel idler gear unit (52) and the supply reel idler gear unit (62), which are freely rotatably fitted in the (60), are engaged with each other and driven to rotate. Take-up reel idler gear unit (52) and supply reel idler gear unit (62)
Is the take-up reel idler gear as shown in Fig. 2.
(54a) and supply reel idler gear (64a) rotation is felt
Transmission to the take-up reel idler gear (54b) that meshes with the reel gears (30) and (40) and the supply reel idler gear (64b) via clutch means using friction members such as (56) and (66). It has a structure that is used. On the other hand, the capstan (72) axially supported by the bearing member (70) fixed to the substrate (2) has a rotary roller part (74) in a part thereof, and the rotary roller part (74) has a predetermined size. The rotation is transmitted to the main idler (76) which is being crimped by being crimped. The main idler (76) is a belt (84) between a pulley part (78) integrally formed and a relay roller (82) rotatably fitted around a shaft (80) set up on the substrate (2). Is stretched, and its rotation is transmitted to the relay roller (82). The shaft (80) has an idler gear (86) rotatable at one end.
A rotating arm (88) rotatably supporting the magnet is loosely fitted, and a magnet (90) magnetized in multiple poles on the outer periphery is integrally mounted so as to be substantially concentric with the shaft (80). Further, a magnetic material (92) having a magnetically hysteresis characteristic is fixed on the inner periphery of the relay roller (82) so as to face the magnet (90) with a predetermined clearance, and the gap between the magnet (90) and the magnet (90) is fixed. A predetermined suction force is generated on the rotation arm (88) and a rotation force in the same direction as the rotation direction of the relay roller (82) is applied to the rotation arm (88). Further, the idler gear (86) is a gear part which is always provided on the relay roller (82).
(94) and meshes with either the take-up reel idler gear (54a) or the supply reel idler gear (64a) by the rotation of the relay roller (82) depending on the operation mode of the apparatus. Then, the rotation of the capstan (72) is changed according to the rotation direction of the winding reel base (10) or the supply reel base (12).
It is configured to selectively transmit to. A pinch roller lever (22) is rotatably fitted to the shaft (18) set up on the substrate (2), and the shaft (24) set up at one end of the pinch roller lever (22) A pinch roller (192) is rotatably supported. A crimp lever (32) provided with an elongated hole (28) so as to be freely rotatable and slidable in the longitudinal direction was loosely fitted to the shaft (26) set up on the substrate (2) and set up at one end thereof. A connecting arm (36) is rotatably fitted to the pin (34), and the other end of the connecting arm (36) is a pin (38) set up at the other end of the pinch roller lever (22). It is loosely fitted in the. Further, a spring hooking portion (42) is formed at the other end of the crimp lever (32), and the tension spring (44) serves as the shaft (26) and the spring hooking portion (42).
The tension lever 32 is urged in the upward direction in FIG. 1 so that the end of the elongated hole 28 and the shaft 26 are in contact with each other. That is, the pinch roller lever (22), the connecting arm (36) and the pressure bonding lever (32) constitute a so-called toggle mechanism. In addition, a pin (46) extends through the hole (not shown) formed in the substrate (2) at the other end of the crimping lever (32) and extends toward the rear surface of the device, and a bent portion (provided on a main rod (48) described later ( It is configured to abut against 21). Therefore, when the main rod (48) in FIG. 1 moves leftward to the position shown in FIG. 3,
Since the bent part (21) is in contact with the pin (46), the crimp lever (3
2) is rotated clockwise, and the pinch roller lever (22) is rotated counterclockwise until the pinch roller (192) contacts the capstan (72). Although the pinch roller lever (22) is not rotated thereafter, the crimp lever (32) continues to rotate clockwise, so that the crimp lever (32) resists the urging force of the tension spring (44).
The (32) is guided by the elongated hole (28) and moves downward in FIG. 3, and at the same time, the pinch roller (192) is pressed by the capstan with a predetermined pressure.
It will be crimped to (72). In the reproducing mode, the magnetic tape wound around the supply reel hub (16) as shown in FIG.
(180) is a guide post (23), (2) from the front of the cassette (20).
5) and (27), (29) the tape pull-out member (182),
As will be described later, the (183) is guided by the guide grooves (31) and (33), respectively, and is moved out to the fixing members (184) and (185) to be pulled out, and the rotating magnetic head (186) and the audio head are connected. It is attached to a fixed head (188) for signal recording / reproduction and a tape guide (190) fixed to the substrate (2). Further, since the capstan (72) rotates clockwise in FIG. 3, the main idler (76) rotates counterclockwise in FIG. 3, and the belt (84) and the relay roller (82) also rotate in the first direction. It rotates counterclockwise in Fig. 3. Accordingly, the rotating arm (88) is given a rotational force in the counterclockwise direction in FIG. 3 about the shaft (80), and the idler gear (86) rotating clockwise in FIG. 3 is the take-up reel idler. Gear (5
4a), the take-up reel stand (10) rotates clockwise through the above-mentioned clutch means, and the pinch roller (1
The magnetic tape (180) fed at a constant speed is wound around the take-up reel hub (14) without sagging by the cooperation of 92) and the capstan (72). On the other hand, a drive gear (160) driven by a motor (not shown) is provided on the back surface of the substrate (2) shown in FIG. 4 and is rotated by the shaft (134) set up on the substrate (2). It is freely supported and meshes with a rotating body (142) having a gear part (143) on the outer circumference. Furthermore, this rotating body (142) also has a gear part (170) on the outer circumference.
It also meshes with a cam (162) having a. This cam (162) is supported by a shaft (164) set up on the base plate (2), and as shown in FIG. 10, it is a positive cam having a groove (166) extending over 360 °, and its lift curve is As shown in FIG. 10, the cam follower (146) described later is moved only in the section where the lift amount changes. Further, on the back side of the substrate (2), the rotary shaft (4) of the take-up reel base (10) and the rotary shaft (50) of the take-up reel idler gear unit (52) extend from the surface and the guide shaft (132), The rotating shaft (164) of the cam (162) is erected, and the cam follower (1) that engages with the groove (166) of the cam (162) is provided.
The main rod (48) having the main rod (46) is
The guide grooves (35), (37), (39), and (41) provided in 8) are loosely fitted so as to be reciprocally movable. The cam (162) has a partial gear (43) with some teeth removed on the end surface where the groove (166) is not provided, and is configured to have a constant angular relationship with the groove (166). There is. When the cam (162) rotates clockwise by a certain angle from the stop state shown in FIG. 4, the cam (162) meshes with the first sector gear (45) having a gear portion, and the tape pull-out members (182), (1
It is configured to move 83). Here, referring to FIG. 4 to FIG. 9, the tape pull-out members (182), (18
The position where the guide posts (23) and (27) abut and crimp on the fixing members (184) and (185) of FIG. 3 showing the reproduction mode from the position of FIG. 1 or 4 where 3) is the stop mode. The operation of moving to will be described in detail. 4 and 5 show the positional relationship in the stop mode. First that can mesh with partial gear (43)
The sector gear (45) is rotatably loosely fitted to the shaft (51) set up on the substrate (2) and is integrally formed with the second sector gear (49) having a gear portion. Reference numeral (55) is an arm integrally formed with the first sector gear (45) and the second sector gear (49), and the pressing pin (53) is planted at the tip. Reference numeral (57) is a third sector gear having a gear part, which is rotatably loosely fitted to a shaft (59) set up on the substrate (2) and meshes with the second sector gear (49). . Reference numeral (98) is an arm having a hole (61) having a cam surface (63) which will be described later and into which the pressing pin (53) can come into contact with the cam surface (63). I'm out. Reference numeral (154) is a pin erected on the first sector gear (45), which is a tension spring (15
2) is stretched between the base plate (2) and the first fan gear (45) integrally formed in the stop mode of FIGS. 4 and 5.
And the turning force in the clockwise direction in FIG. 4 is applied to the second sector gear (49).

(65) is the shaft (59) integrally with the third sector gear (57) and the arm (98).
A fourth fan gear having a gear portion rotatable about the center of the shaft, meshing with a first loading gear (69) which is a gear rotatable about a shaft (67) erected on the substrate (2). ing. (7
1) is a second loading gear, which is a gear that can rotate around the shaft (67) integrally with the first loading gear (69), and can rotate on the shaft (73) set up on the substrate (2) It engages with the third loading gear (75), which is a gear loosely fitted in, and rotates synchronously. (77) is a left side loading first arm, which is loosely rotatably fitted to the shaft (67) and has a fifth arm.
As shown in FIG. 9 and FIG. 9, the spring hook (79) provided on the left loading first arm (77) and the second loading gear (7
A tension spring (81) is stretched between the pin (83) set in (1) and the stopper (85) provided on the left side loading first arm (77) is brought into contact with the pin (83). The left loading first arm (77) and the second loading gear (71)
And are integrated and configured to rotate together. A left loading second arm (87) is rotatably coupled to one end of the left loading first arm (77) by a pin (89), and a hole (91) is provided at the other end of the left loading second arm (87). )
And is engaged with the pin (93) that is planted in the tape pull-out member (182). (95) is the right side loading No. 1
Although it is an arm, the third loading gear (75) has the same structure as that between the left loading first arm (77) and the second loading gear (71), and the other end similarly has a pin ( The right side loading second arm (99) is rotatably coupled by means of (97), and the hole (101) opened at the other end of the right side loading second arm (99) is formed in the tape withdrawing member (183). Engaged with the implanted pin (103).
At this time, as described above, since the second sector gear (49) is given a rotational force in the clockwise direction in FIG. 5 by the biasing force of the tension spring (152), it meshes with the second sector gear (49). The third sector gear (57) and the fourth sector gear (65) integral with the third sector gear (57) receive the rotational force in the counterclockwise direction in FIG. It meshes with the fourth sector gear (65). The first loading gear (69) and the second loading gear (71) receive rotational force in the clockwise direction shown in FIG. 5, and the third loading gear (75) meshing with the second loading gear (71) shows in FIG. It receives counterclockwise turning force. Therefore, the left loading first arm (77) and the left loading second arm (87), which can rotate integrally with the second loading gear (71), also receive the rotational force in the clockwise direction in FIG. ) Is engaged with the hole (91) formed in the left side loading second arm (87), the tape pull-out member (182) is urged in the direction of arrow A in FIG. 4 to move to the end of the guide groove (31). The pin (93) is pressed against the fixed wall (115a) provided. Moreover, the tape pull-out member (182
(Is a guide boss (117a) of the same diameter as the groove width of the guide groove (31),
(119a), and these are fitted in the guide groove (31), the tape pull-out member (182) is stopped by the pin (93) and the fixed wall (115a) in FIG. A
At the same time that the position of the pin (93) is restricted, the rotation of the pin (93) is restricted. Similarly, the right loading first arm (95) and the right loading second arm (99), which can rotate integrally with the third loading gear (75), receive the rotational force in the counterclockwise direction in FIG. (1
03) is a hole (101) opened in the right side loading second arm (99)
The tape pull-out member (183), which is engaged with the tape pull-out member (183), is biased in the direction of arrow B in FIG.
The pin (103) is pressed against the (115b). In addition, the tape pull-out member (183) has guide bosses (117b) (119b) having substantially the same diameter as the groove width of the guide groove (33), and these are fitted in the guide groove (33). In the stopped state, the tape pull-out member (183) also has the pin (103) and the fixed wall (115).
By b), the position is restricted in the direction of arrow B in FIG. 4 and, at the same time, the pivotal movement about the pin (103) is restricted. Therefore, as shown in FIG. 1, in the stop mode, the tape guide posts (23), (25) and (27), (29) set up on the tape pull-out members (182), (183) are the cassettes ( This means that the opening wall portion (120) of the (20) and the magnetic tape (180) are fixed at a predetermined interval. Now, when the cam (162) starts to rotate in the clockwise direction from the position shown in FIG. 5, the partial gear (43) and the first sector gear (45) having a rotation angle of 40 ° in the cam diagram shown in FIG.
Starts to mesh with each other, and the first sector gear (45) and the second sector gear (49) start to rotate counterclockwise against the biasing force of the tension spring (152). Further, since the third sector gear (57) and the fourth sector gear (65) rotate clockwise, the first loading gear (69), the second loading gear (71), and the left loading first arm.
(77) rotates counterclockwise and the third loading gear (75)
Rotates clockwise, the right loading first arm (95) rotates clockwise, and as a result, the tape pull-out member
(182) and (183) start moving along the guide grooves (31) and (33). FIG. 6 shows the cam (162) rotated by 105 °. At this time, from the partial gear (43) to the first loading gear (69),
2nd loading gear (71), 3rd loading gear (75)
All the operations up to are performed by the gear train. Next, FIG. 7 shows a state in which the cam (162) is rotated up to 160 °.
At this time, the second fan gear (49) and the third fan gear (57) are disengaged from each other, and the pressing pin (53) is provided on the arm (98) on the cam surface.
Contact with (63) has started. At this time, the tension spring (1
The pin (154) suspended at one end of the pin 52 passes through the dead point, and the tension spring (152) is urged by the first fan gear (4).
5) and the arm (55) to the 7th contrary to before passing the dead center of the pin (154)
In the figure, the turning force is applied counterclockwise, and the partial gear (4
In 3), the first sector gear (45) can be rotationally driven with less torque. Further, in this state, the left loading first arm (77) and the right loading first arm (95) connect the tape pull-out members (182), (183) to the guide posts (23), (2).
7) are moved to positions where they abut the fixing members (184) and (185), respectively. When the cam (162) continues to rotate in the clockwise direction in FIG. 7 from the state shown in FIG. 7, the first fan gear (45)
7 rotates counterclockwise in FIG. 7, and the second fan gear (49) and the third fan gear (57) of the arm (98) are disengaged from each other. 63) Press and continue rotating clockwise. As mentioned above, tape guide posts (2
Since 3) and (27) are in contact with the fixing members (184) and (185), the left side loading first arm (77) and the right side loading first arm (95) can rotate more than the state shown in FIG. No, and as a result, the first loading gear (69) and the third loading gear
(75) continues counterclockwise and clockwise rotations against the biasing forces of the tension springs (81) and (109), respectively. And cam (16
When 2) rotates up to a rotation angle of 180 °, the meshing relationship between the partial gear (43) and the first sector gear (45) is released and the pressing pin (53) is released.
Is located on the horizontal portion of the cam surface (63) in FIG. The toothless portion (111) of the third sector gear (57) is disengaged from the meshing relationship between the second sector gear (49) and the third sector gear (57), and the pressing pin (53) and the cam surface (63) come into contact with each other. It is provided to prevent the interference of the teeth when moving to the contact relationship. Cam (162) with rotation angle 205
FIG. 8 shows a state in which the reproduction mode is reached by rotating up to 0 °. As described above, in the state shown in FIG. 7, the left loading first arm (77) and the right loading first arm (95) cannot rotate so that the first loading gear (69) and the third loading gear (75) are not rotated. Rotate counterclockwise and clockwise respectively, so a gap of Δ occurs between the pin (83) and the stopper (85).
Similarly, there is a gap of Δ'between the stopper provided on the right side loading first arm (95) and the pin installed on the third loading gear (75). After all, the gaps Δ and Δ ′ are nothing but the elongation of the tension springs (81) and (109), but the force corresponding to this elongation causes the guide posts (23) and (2).
The magnetic tape (180) is affixed to the rotating magnetic head (186) while the magnetic tape (180) is pressed by the fixing members (184) and (185). On the other hand, the pressing force exerted by the tension springs (81) and (109) acts as a reaction force to rotate the first loading gear (69) and the third loading gear (75) clockwise and counterclockwise, respectively. It is self-evident and therefore follows the fourth fan gear (6
The armature (5) and the arm (98) receive a counterclockwise turning force, and this turning force is applied to the pressing pin (53) by the pressing pin (53) on the cam surface (63) shown in FIG. Since it is located at, the voltage is applied in the direction of arrow A in FIG. However, since the direction of the arrow A coincides with the direction connecting the pressing pin (53) and the shaft (51), this turning force is generated by the arm (55).
Also, it cannot be an effective force for rotating the first sector gear (45), and the first sector gear (45) can maintain the state of FIG. 8 in spite of the existence of the reaction force of the pressing force. Therefore, the (162) can continue to rotate in the clockwise direction without being affected by the reaction force while leaving the meshing relationship with the first sector gear (45). Next, the main rod by rotating the cam (162)
The relationship between the movement of (48) and the movement of the tape pull-out member will be described. When the cam (162) rotates clockwise by 60 ° from the stop state shown in FIG. 4, the main rod (48) moves 1.5 mm to the right in FIG. 4 by following the groove (166) and bends (21). Presses the pin (46) of the crimp lever (32), so the pinch roller (19
2) approaches Kyastan (72). When the cam (162) continues to rotate and rotates up to a rotation angle of 180 °, the mais rod (48) moves about 2.5 mm, and the pinch roller (192) abuts the capstan (72), but to generate a crimping force. I can't reach it.
Then, when the cam (162) rotates from a rotation angle of 180 ° to 200 °, the main rod (48) further moves to the right in FIG. 4 by about 2 mm, and the pinch roller (192) moves to the capstan (72) by the tension spring (44). Crimping with a predetermined crimping force. That is, as is clear from the cam lift curve shown in Fig. 10, the pinch roller
The guide post (23) and the rotation angle range in which the cam (162) requires a rotational force for the (192) to crimp the capstan (72).
Cam (162) for crimping (27) to fixing members (184), (185)
It means that the rotation angle ranges that require rotation force do not overlap.

Next, the operation will be described. When the play button (not shown) is pressed from the stop mode shown in FIG. 1, the motor (not shown)
Rotates, and the drive gear (160) and the rotating body (142) are respectively moved to the fourth position.
The cam (162) starts to rotate clockwise in FIG. 4 by rotating it clockwise and counterclockwise in FIG. When the cam (162) rotates by an angle of rotation of 40 °, the partial gear (43) and the first first sector gear (45) start to mesh with each other, and the tension spring (152) causes the fixed wall (of the guide grooves (31), (33) ( The tape pull-out member (18
2) Move the magnetic tape (180) to the outside of the cassette (20) by moving the (183) at an almost constant speed. At the same time the main rod (4
8) also follows the groove (166) and starts to move to the right in FIG. 4, and the pinch roller (192) begins to approach the capstan (72) direction. The cam (162) continues to rotate and rotates to a rotation angle of 160 ° Two
The meshing relationship between the sector gear (49) and the third sector gear (57) is released, and the pressing pin (53) enters the abutting relationship with the cam surface (63) and the guide posts (23) and (27) are fixed members. Abut on (184), (185),
When the cam (162) continues to rotate up to a rotation angle of 180 °, the pressing pin (53) slides on the cam surface (63) to fix the guide posts (23) and (27) to the fixing member (184), It will be crimped to (185). At this time, the urging force of the tension spring (152) causes the first fan gear (45) and the arm (55) to rotate in the counterclockwise direction in FIG. 7, so that the guide post that generally requires a large load is used. Fixing members (184), (18) of (23), (27)
The load at the time of crimping to 5) will be reduced and the motor current will be greatly reduced. Further, at this time, if the pressure angle of the cam surface (63) with respect to the pressing pin (53) is made as small as possible, the guide posts (23) and (27) are fixed with a smaller force (18).
It is clear that it can be crimped to 4) and (185). At this time,
Since the cam (162) has rotated up to a rotation angle of 180 °, the main rod (48) has moved to the right in FIG. 4 by about 4 mm as shown in FIG. 10, and the pinch roller (192) has moved to the capstan (72). To start contact with. Furthermore, the main rod (48) moves to the right in FIG. 4 by continuing the rotation of the cam (162) up to a rotation angle of 200 °.
After moving by mm, the pinch roller (192) is completely pressed against the capstan (72). During this crimping operation, the meshing relationship between the partial gear (43) of the cam (162) and the first sector gear (45) is released, so the guide post (2)
It is obvious that the cam (162) rotates without being subjected to the reaction force of the crimping of the fixing members (184) and (185) of 3) and (27). When the cam (162) further rotates up to a rotation angle of 205 °,
The cam lift curve enters the horizontal portion of the figure, and a switch (not shown) operates to stop the motor and stop the rotation of the cam (162). On the other hand, at this time, the capstan (72) is rotated clockwise in FIG. 3, and the main idler (76) is rotated counterclockwise in FIG. Therefore, belt (84), relay roller (8
2), the rotating arm (88) also rotates counterclockwise in FIG. 3, and the idler gear (86) rotating clockwise in FIG. 3 meshes with the take-up reel idler gear (54a) as described above. The take-up reel base (10) rotates clockwise in FIG. 3 through the clutch means, and the pinch roller (192) and capstan
The magnetic tape (180) fed at a constant speed by the cooperation of (72) is wound around the take-up reel hub (14) without sagging, and the reproduction mode is set.
Next, when the stop button (not shown) is pressed, the motor rotates in the reverse direction, and the drive gear (160) and the rotating body (142) are rotated counterclockwise and clockwise in FIG. 4, respectively, and the cam (162) moves to the first position. Figure 4 Starting to rotate counterclockwise, pinch roller (192) and capstan
(72) is separated, and the tape pull-out members (182), (183) are moved in the direction of the cassette (20). Further, the capstan (72) rotates counterclockwise in FIG. 3, the idler clutch (86) meshes with the supply reel idler gear (64a), and the supply reel base (12) rotates counterclockwise in FIG. , The magnetic tape that has been pulled out is wound around the supply reel hub (16) without slack. After that, when the cam (162) rotates up to a rotation angle of 0 °, the switch operates to stop the rotation of the motor to stop the cam (162), and also the rotation of the capstan (72), as shown in FIG. It becomes a stop mode.

As described above, according to the present invention, the magnetic tape pulling-out means is provided with the fixing member for determining the positions of the magnetic tape pulling-out means having the pair of guide posts at the first position and the second position. Along with the reciprocal movement between the first position and the second position, the same elastic body is used for the magnetic tape pulling-out means and a biasing force is applied in the first position direction at the first position. However, since the applying force applying means for applying the urging force in the second position direction is provided at the second position, the torque required for the motor when the magnetic tape pulling means is pressed against the fixing member at the second position. Can be reduced, and accordingly, current consumption can be reduced.
Further, since the magnetic tape pull-out means is also pressed by the biasing force against the fixing member at the first position, when the position of the magnetic tape pull-out means is accurately determined and the tape cassette is mounted on the magnetic tape device main body, the magnetic tape It prevents the guide post of the pull-out means from abutting the wall of the tape cassette, damaging the tape cassette or the guide post, or coming into contact with the magnetic tape and damaging the magnetic tape. As a result, the position of the magnetic tape pull-out means does not change, while the tape cassette is downsized and the guide post of the magnetic tape pull-out means can be reliably positioned with respect to the opening even if the front opening is downsized. In addition, there is a margin of accuracy for the cassette holder when mounting the tape cassette on the device. The effect on the use is made extremely large. Moreover, an extremely simple structure can be realized by using the same elastic body.

Although the fixing member at the first position is the end portion of the guide groove in this embodiment, it goes without saying that the fixing member may be provided separately from the guide groove or the fixing member may be provided with a position adjusting means.

Further, in this embodiment, the spring member for pressing the magnetic tape pulling-out means against the fixing member at the second position and the spring member for urging the magnetic tape pulling-out means toward the second position in the vicinity of the second position are separate members. It goes without saying that the spring member for pressing and pressing can be omitted, and the pressing member can be configured so as to press and press.

[Brief description of drawings]

FIG. 1 is a main part surface view in a stop mode of an embodiment of the present invention,
FIG. 2 is a schematic sectional view of the reel drive system, FIG. 3 is a front view of a main part in a reproduction mode, FIG. 4 is a rear view of a main part in a stop mode, FIG. 5, FIG. 6, FIG. 7, and FIG. FIG. 9 is a diagram for explaining the operation of the drive unit of the tape pull-out member, FIG. 9 is a schematic sectional view of the drive unit, and FIG. 10 is a lift curve diagram of the cam. (20) …… cassette, (43) …… partial gear, (45) …… first fan gear, (48) …… main rod, (49) …… second fan gear, (53) …… pressing pin, (63) …… cam surface, (65) …… fourth
Sector gear, (69) …… first loading gear, (75) …… third loading gear, (152) …… tension spring, (162) …… cam, (166) …… groove, (182) (183) ) …… Tape pull-out member,
(184) (185) …… Fixing member

Claims (1)

[Claims] 1. A tape cassette having a reel hub around which a magnetic tape is wound and having an opening at the front is used, and the magnetic tape is pulled out from the cassette by using a pair of guide posts and is installed outside the tape cassette. A magnetic head is arranged so as to run so as to record / reproduce signals, and the magnetic tape in the tape cassette can be pulled out from the opening, and the magnetic tape can be pulled out to the outside of the tape cassette. A magnetic tape pull-out means that reciprocates between a second position that can be attached to the head and that has the pair of guide posts, and a fixing member that determines the positions of the magnetic tape pull-out means at the first position and the second position. And with the reciprocating movement of the magnetic tape pulling means between the first position and the second position, the same elastic body is used. An urging force is applied to the magnetic tape pull-out means in the first position toward the fixing member at the first position, and an urging force in the second position toward the fixing member at the second position. The configured magnetic tape device.