JPH06101169B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a magnetic recording and / or reproducing apparatus, a rotating body,
In particular, the present invention relates to a torque control device for a rotating body that changes the torque of the reel stand according to the mode.

(B) Conventional Technology Conventionally, the present applicant has provided Japanese Patent Application No. Sho 58-185611 (Japanese Patent Laid-Open No. Sho 60-79547) as a technology of a magnetic recording and / or reproducing apparatus (video tape recorder). Briefly describing the technique, a single moving lever that has a special shape and is interlocked with the rotation of a loading gear is provided at the bottom of the chassis, and a series of several kinds of movements are performed by the left and right movements of the moving lever. That is, a main brake piece that brakes the reel base, a sub-brake that is commonly used during high-speed fast-forwarding and rewinding and tape loading, and that is lightly pressed against the reel base to prevent step winding of the magnetic tape wound around the supply and take-up reels. Controls such as pressure bonding of one side, capstan and pinch roller were performed.

When the tape loading is executed in this technique, the moving lever first moves to the left or right according to the control signal from the system control. By this movement, only one sub-brake piece is lightly pressed against the supply reel base, and only the other sub-brake piece is pressed against the take-up reel base stronger than that of one. As a result, the magnetic tape is pulled out from only the supply reel by the pull-out member and wound around the cylinder while the rotation of the take-up reel stand is stopped, and the mode such as recording / reproducing becomes possible.

(C) Problems to be Solved by the Invention Generally, when the tape loading is completed, the pull-out member for pulling out the magnetic tape is pressure-bonded to the pressure-bonding member (catcher) to restrict the movement thereof. Further, the larger the amount of the magnetic tape wound around the supply reel is, the lighter the pulling force of the magnetic tape by the pulling member is.

Considering this fact and considering the tape loading of the above technology in which the pressure contact force of the auxiliary brake piece with respect to the supply reel base is small, the inertial force of the magnetic tape pulled out by the pullout member is more than the back tension force of the magnetic tape. In this state, when the pull-out member is pressure-bonded to the pressure-bonding member at a predetermined speed, the magnetic tape separates from the pull-out member and loosens due to its own inertial force. In other words, there are problems that the magnetic tape is damaged and the rising edge of the image is disturbed during reproduction.

Therefore, in order to solve the above-mentioned problems, the moving speed of the drawing member at the time of tape loading is slowed to reduce the inertial force, or the moving speed of the drawing member is slowed immediately before the drawing member is crimped to the crimping member. There is also a technology to do this, but in the former case, the tape loading time becomes long and it is not possible to quickly shift to the recording / playback mode.
In the latter case, there is a problem that the mechanism becomes complicated.

(D) Means for Solving Problems The present invention has been made to solve various problems described above, and in a magnetic recording / reproducing apparatus in which a magnetic tape is pulled out from a cassette and wound around a cylinder at a predetermined angle, A tape pull-out means for pulling out the magnetic tape; a brake means for pressing the reel base with a first elastic force and applying a first load; an interlocking means for interlocking with the tape loading operation of the magnetic tape pull-out means; And a control means having an engaging portion that engages with the interlocking means against the elastic force and an urging portion that applies the second elastic force to the brake means.
During the tape loading by the tape pull-out means with the first load applied to the reel base, the control means and the interlocking means are disengaged, and the second elastic force is applied to the braking means. The magnetic recording / reproducing apparatus is characterized in that a second load is applied to the reel stand to reduce the moving speed of the tape pull-out means.

(E) Action According to the torque control device for a rotating body of the present invention, when the interlocking means and the engaging portion are in the engaged state, the first elastic force of the braking means applies the first load to the rotating body. A second load is applied to the rotating body by the first elastic force of the brake means and the second elastic force of the control means before the completion of the tape loading in which the engagement with the interlocking means and the engaging portion is released. As a result, the moving speed of the pull-out means at the time of tape loading is varied, and good tape loading operation is performed.

(F) Example The details of the present invention will be specifically described with reference to the illustrated example.

1 to 5 show the magnetic recording and / or reproducing apparatus according to the present invention, which are stopped, tape loading,
Fig. 6 is a plan view showing the state of rewinding and rewinding when transitioning from replay and fast-forward replay to rewind replay,
7 is a side view of FIG. 6, and FIG. 8 is an exploded side view of FIG. The drawing numbers and configurations will be described with reference to FIGS. 1 to 8. (1) is a chassis having loading grooves (2) and (3), and (4) and (5) are the loading grooves (2).
Catcher provided at the end of (3), (6) (7)
Is a roller (16) (1) provided in a tape cassette (not shown) accommodating the magnetic tape (8) indicated by the chain double-dashed line.
7) (18) tape guide, (19) impedance roller, (20) full width erasing head, (21) voice erasing head, (22) voice / control head, (25) (26)
Is a supply reel stand and a take-up reel stand, which are rotatably coupled to the chassis (1), and (27) has guide grooves (28) and (29). Cam, (24) is a pinch roller that is interlocked with the rotation of the cam (27) and presses against the capstan (23), and (9) is a loading post (10) for drawing out the magnetic tape (8) and an inclined pole. A drawer member having (11) and moving in the loading groove (2) in conjunction with the rotation of the cam (27);
(12) has a loading post (13) for pulling out the magnetic tape (8) and an inclined pole (14), and the cam (2)
A drawer member that moves in the loading groove (3) in conjunction with the rotation of 7), and (15) is the drawer members (9) and (12).
A cylinder (30) around which the magnetic tape (8) is drawn out by a pin (3) guided in the guide groove (28).
1), a tension arm as an interlocking means elastically held in the counterclockwise direction around the support shaft (33) by a spring (32) locked at one end thereof, (34) is the chassis (1) And between the tension arms (30),
A band brake which is pressed against the side surface of the supply reel base (25), and (35) is a pin (3) which is guided in the guide groove (29).
6) and pressing protrusions (37) (38), the cam (2
A moving lever that moves left and right in conjunction with the rotation of (7), (3
9) has a branch portion (40), which is elastically held in the counterclockwise direction about the support shaft (42) by a spring (41) locked at one end thereof and is provided on the side surface of the take-up reel stand (26). A brake piece (44) that is commonly used during high-speed fast-forwarding and rewinding and tape loading for preventing stepwise winding of the magnetic tape (8) wound under pressure and wound on a take-up reel (not shown) in the tape cassette. ) (43) is made of resin and has a support shaft integrally provided with the chassis (1), and a locking pawl having a taper (55), and (45) is widened by a step (46). From the side, an insertion hole (47) into which the locking claw (43) is inserted, a shaft hole (57) into which the support shaft (44) is inserted, and an engaging portion (48) that engages with the tension arm (30). ) And a biasing force (49), and a second elastic force spring (50) locked at one end thereof A control arm as a control means elastically held in the clockwise direction around the shaft (44), (51) has a taper (56), and is a collar portion (53) locked by the locking claw (43). A shaft hole (58) into which the support shaft (44) is inserted, and a protruding piece (5) urged by the urging portion (49).
2) is provided, and is elastically held in the clockwise direction around the support shaft (44) by a spring (54) having a first elastic force locked at one end thereof, and is pressed against the side surface of the supply reel base (25). Then, the supply reel (not shown) in the tape cassette
It is a brake piece as a braking means that is commonly used for high-speed fast-forwarding and rewinding and tape loading for preventing step winding of the magnetic tape (8) wound around the tape.

Here, a method of attaching the control arm (45) and the brake piece (51) to the chassis (1) will be described. In FIG. 8, the insertion hole (47) on the side that is first widened by the step (46).
The locking claw (43) is inserted from the above, and the support shaft (44) is inserted into the shaft hole (57). At this time, the diameter of the shaft hole (57) is
Since it is larger than that of 4), the locking claw (43) can be easily inserted into the insertion hole (47), and the control arm (45) can be rotated. Next, the support shaft (44) is inserted into the shaft hole (58) to support the brake piece (51), and the elasticity of the locking pawl (43) made of resin is used to set the taper (55) (56). The collar portion (53) is locked to the locking portion (43) while being in contact with each other. At this time, the wall thickness around the shaft hole (58) is the shaft hole (57) and the support shaft (44).
The control arm (45) is also inserted in the diameter difference part between
It is made to be supported by 4). From this, as shown in FIGS. 6 and 7, the control arm (45) and the brake piece (5
1) can be easily and securely attached to the chassis (1).

First, in the stopped state of FIG. 1, the magnetic tape (8) is housed in the tape cassette in a state where it is not pulled out by the pull-out members (9) and (12), and the tension arm (30) is also present.
Is a pull-out member (9) against the elastic force of the spring (32).
Since the magnetic tape (8) is engaged with the magnetic tape (8), the band brake (34) is further separated from the side surface of the supply reel base (25). On the other hand, since the control arm (45) is engaged with the tension arm (30) against the elastic force of the spring (50), the brake piece (5
1) is lightly pressed against the side surface of the supply reel stand (25) by the elastic force of only the spring (54), that is, the supply reel stand (25)
Is applied with a first load for preventing step winding of the magnetic tape (8). Similarly, the brake piece (39) is pressed against the side surface of the take-up reel stand (26) by the elastic force of the spring (41), that is, the take-up reel stand (26) also serves to prevent the stepwise winding of the magnetic tape (8). A first load is applied. Then, in this state, high speed fast-forwarding and rewinding can be performed.

When a reproduction button (not shown) on the device side is turned on in order to reproduce a predetermined signal recorded on the magnetic tape (8) from the above-mentioned stopped state, the cam (27) is moved to the second position by the control signal from the system control. As shown in the figure, the driving force is transmitted to rotate clockwise. When the pin (36) is guided in the guide groove (29) by this rotation, the moving lever (35) moves to the right, and the supply reel in the tape cassette placed on the supply reel stand (25). The branch portion (40) is pressed downward by the pressing protrusion (38) only during a tape loading period in which the magnetic tape (8) is drawn out by the drawing members (9) and (12). As a result, the brake piece (39) comes into pressure contact with the side surface of the take-up reel stand (26) with a pressure contact force greater than the elastic force of the spring (41). In other words, the first load is applied to the take-up reel stand (26). The above load is applied, and the rotation of the take-up reel placed on the take-up reel stand (26) is stopped only during the tape loading period.

In addition, the pin (31) is rotated by rotating the cam (27) clockwise.
When is guided in the guide groove (28), the elastic force of the spring (32) is also added, and the tension arm (30) causes the support shaft (33) to move.
Rotate counterclockwise around. Then, when the magnetic tape (8) is pulled out by the pull-out members (9) and (12) from the supply reel on the supply reel stand (25) to which the first load is applied, the tension arm ( 30) and the engaging portion (48) are separated from each other, the control arm (45) is rotated clockwise about the support shaft (44) by the elastic force of the spring (50), and the projecting piece (52) is attached. It is urged by the force department (49). As a result, the brake piece (51) comes into pressure contact with the side surface of the supply reel stand (25) by the contact force of the elastic force of the springs (50) (54). In other words, the first load is applied to the supply reel stand (25). The second load described above is applied, and the drawer members (9) (12)
2 is decelerated from the state shown in FIG.

When the cam (27) is further rotated clockwise as shown in FIG. 3 from the above-mentioned state, the pull-out members (9) (12) whose moving speed is reduced are pressed to the catchers (4) (5) respectively. , Its movement is regulated. At this time, since the inertial force at the time of crimping is weakened, the magnetic tape (8) is slackened away from the pull-out members (9) and (12) as shown by broken lines a ₁ and b ₁ in FIG. It is securely wound around the cylinder (15) without sagging.

When the pin (36) is continuously guided in the guide groove (29) by the clockwise rotation of the cam (27), the moving lever (35) further moves rightward, and the catcher (4) (5). ), The branch portion (40) is released from being pressed by the pressing protrusion (38). As a result, the brake piece (39) is lightly pressed against the side surface of the take-up reel stand (26) by the pressure contact force of the elastic force of the spring (41), and the take-up reel stand (26).
Is applied with a first load. Further, the projecting piece (52) is pressed by the pressing projecting piece (37), and the brake piece (51) and the control arm (45) move the support shaft (44) against the elastic force of the springs (54) (50). The supply reel base (25) is released from the pressure contact by the brake piece (51) by slightly rotating counterclockwise around the center.

When the pin (31) is guided in the guide groove (28) by the clockwise rotation of the cam (27), the elastic force of the spring (32) is also added and the tension arm (30) is supported by the spindle (33). Rotate further counterclockwise around the to move the tape guide (16)
(17) (18) and impedance roller (19) are wrapped around, and a full width erasing head (20) and a voice erasing head (2
1) and the voice / control head (22), and tension is applied to the magnetic tape (8) sandwiched by the capstan (23) and the pinch roller (24). At the same time, when the tension arm (30) is rotated counterclockwise, the band brake (34) is pressed against the side surface of the supply reel base (25), in other words, the load necessary for reproduction is applied to the supply reel base (25). It Then, as the take-up reel base (26) rotates in the clockwise direction at a low speed, the supply reel base (25) also rotates in the clockwise direction at a low speed, and the reproduction of the predetermined signal recorded on the magnetic tape (8) is executed.

When the rewind button (not shown) on the device side is turned on in order to perform rewind reproduction in which tension by the tension arm (30) is unnecessary for the magnetic tape (8) from the above-mentioned reproduction state, the system control is performed. The control signal from the cam causes the cam (27) to slightly rotate counterclockwise as shown in FIG. When the pin (31) is guided in the guide groove (28) by this rotation, the tension arm (30) slightly rotates clockwise about the support shaft (33) against the elastic force of the spring. The tension on the magnetic tape (8) is released and the pressure contact of the band brake (34) on the supply reel base (25) is released. At this time, in order to remove the slack of the magnetic tape (8) between the supply reel and the take-up reel caused by the tension release, the take-up reel stand (26) is rotated slightly at a high speed in the clockwise direction to execute the fast-forward reproduction.

Then, when the fast-forward reproduction is completed, the pinch roller (24) is separated from the capstan (23), and the pin (36) is guided in the guide groove (29) by the counterclockwise rotation of the cam (27) to move. The branch (40) is pressed by the pressing protrusion (38) by a slight leftward movement of the lever (35). As a result, the brake piece (39) is pressed against the side surface of the take-up reel stand (26) with a pressing force greater than the elastic force of the spring (41), and the take-up reel stand (26) is given a load equal to or greater than the first load. Stops at the same time as the end of fast-forward playback. Further, the projecting piece (52) is released from the pressing by the pressing projecting piece (37), and the brake piece (51).
The control arm (45) slightly rotates clockwise about the support shaft (44) by the elastic force of the springs (54, 50). From this, the brake piece (51) is the spring (50).
The elastic force of the elastic force of (54) presses the side surface of the supply reel base (25), and the supply reel base (25) is applied with a second load so that the magnetic tape ( 8)
Make sure to stop without sagging.

In other words, since the conventional device is not provided with the control arm (45) which is a component of the present invention, the load applied to the supply reel base (25) during the transition from the fast-forward reproduction to the rewind reproduction described above. Is only the first load, which is light enough to prevent the step winding of the magnetic tape (8), and the supply reel stand (25) must be stopped at the same time as the take-up reel stand (26) is stopped after the fast-forward reproduction is completed. Cannot be done, that is, Fig. 4, a ₂ ,
As shown in b ₂ , the magnetic tape (8) is attached to the pull-out member (9) (1
Although it was slackened as it was separated from 2), this problem was solved by the present invention, and the magnetic tape (8) was fixed to the loading posts (10) (13) and the inclined poles (11) (14) without slack. It is held in a wound state.

After that, the cam (27) is slightly rotated clockwise by the control signal from the system control, and the pins (31) (36) are rotated.
Are guided in the guide grooves (28) and (29) respectively, the brake piece (39) is pressed against the side surface of the take-up reel base (26) by the pressing force of the elastic force of the spring (41) as in the above-mentioned regenerated state. At the same time, the brake piece (51) is separated from the side surface of the supply reel base (25). Further, while the band brake (34) is separated from the side surface of the supply reel base (25), the tension arm (3
0) rotates slightly about the support shaft (33) in the clockwise direction against the elastic force of the spring (32) and around the magnetic tape (8). Then, as the supply reel base (25) rotates counterclockwise at high speed, the take-up reel base (26) also rotates counterclockwise at high speed, and good rewinding reproduction is executed.

Since the operation such as tape unloading for shifting from the reproduction state to the stopped state is the reverse operation to the above, the description thereof will be omitted.

(G) Effect of the Invention According to the torque control device for a rotating body of the present invention, the movement of the pull-out member at the time of tape loading can be changed with an easy configuration. Therefore, the inertial force applied to the pull-out member at the completion of tape loading is sufficient. Weakened by. As a result, when the tape loading is completed, the magnetic tape is securely wound around the pull-out member, the damage of the magnetic tape is prevented, and a good image rise with a short tape loading time is obtained. Further, the number of parts is reduced due to the simple structure, and there are advantages such as improvement in productivity, cost reduction, and reduction in size and weight of the apparatus.

[Brief description of drawings]

1, 2, 3, 4, and 5 are plan views showing a magnetic recording and / or reproducing apparatus using the present invention, and FIG. 6 is a main part plan view of the present invention. 7 is a side view of FIG. 6,
FIG. 8 is an exploded side view of FIG. (8) …… Magnetic tape, (9) (12) …… Drawer member,
(15) …… Cylinder, (25) …… Supply reel stand, (30)
...... Tension arm, (45) …… Control arm, (48)
...... Engagement part, (49) …… Biasing part, (51) …… Brake piece.

Claims (1)

[Claims] 1. A magnetic recording / reproducing apparatus for pulling out a magnetic tape from a cassette and winding the magnetic tape around a cylinder at a predetermined angle, and a tape pull-out means for pulling out the magnetic tape, and a first elastic force that presses the reel base and presses the reel base. The braking means for applying a load, the interlocking means interlocking with the tape loading operation of the magnetic tape pulling out means, the engaging portion engaging with the interlocking means against the second elastic force, and the second braking means. Control means having an urging portion that applies the elastic force of the control means and the interlocking means during the tape loading by the tape pulling means with the first load applied to the reel base. The engagement is released, the second elastic force is applied to the braking means, a second load is applied to the reel base, and the tape drawing means is moved. Magnetic recording and reproducing apparatus characterized by decelerating the speed.