JPH0548542B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a torque control device for a rotating body in a magnetic recording and/or reproducing device, particularly for varying the torque of a reel stand depending on the mode. It is.

(b) Prior art Conventionally, the present applicant has developed a patent application for magnetic recording and/or reproducing equipment (video tape recorder).
No. 58-185611 is presented. To briefly explain this technology, there is a single moving lever that has a special shape and is linked to the rotation of the loading gear at the bottom of the chassis. The main brake piece is used to brake the reel stand, and is used during high-speed fast forwarding and rewinding as well as during tape loading, and is lightly attached to the reel stand to prevent the magnetic tape being wound around the supply and take-up reels. The pressure of the auxiliary brake piece, capstan, and pinch roller was controlled.

When tape loading is performed using this technique, the moving lever is first moved left and right in response to a control signal from the system control. Due to this movement, only one of the sub-brake pieces comes into light pressure contact with the supply reel stand, and only the other sub-brake piece comes into contact with the take-up reel stand more strongly than the other sub-brake piece. From this, the magnetic tape is pulled out from only the supply reel by the pull-out member while the rotation of the take-up reel stand is stopped, and is wound around the cylinder, thereby enabling modes such as recording/reproduction.

In addition, when rewinding playback is performed from the playback state after the completion of tape loading using the above technology, since there is no need for the tension arm to apply tension to the magnetic tape at the time of rewinding playback, the first step is to move the tension arm. The tension is released. However, the tension release causes slack in the magnetic tape, and a slight fast-forward playback is performed to remove this slack. After fast-forward playback, rewinding playback becomes possible by reversing the running direction of the magnetic tape.

(C) Problems to be Solved by the Invention Generally, when tape loading is completed, a pull-out member for pulling out the magnetic tape is pressed against a pressure-bonding member (catcher) to restrict its movement. Also, the larger the amount of magnetic tape wound on the supply reel, the more
The force with which the magnetic tape is pulled out by the pull-out member becomes lighter.

Considering this fact and considering the tape loading of the above technology in which the pressure contact force of the auxiliary brake piece against the supply reel table is light, the inertial force of the magnetic tape pulled out by the pull-out member is the back tension force of the magnetic tape. If the pull-out member is pressed against the crimping member at a predetermined speed in this state, the magnetic tape will separate from the pull-out member due to its own inertia and become loose, damaging the magnetic tape and causing damage to the magnetic tape. There were problems such as the rise of the image being distorted during playback. Therefore, in order to solve the above problem, the moving speed of the drawing member during tape loading is slowed down to reduce the inertial force, or the moving speed of the drawing member is reduced just before the drawing member is crimped to the crimping member. There are techniques to slow down the tape, but in the former case, the tape loading time becomes long and it is not possible to switch to recording/playback mode quickly, and in the latter case,
The mechanism was becoming more complex.

In addition, in the case of rewind playback using the above technology, only one of the auxiliary brake pieces comes into pressure contact with the supply reel stand during the transition from fast forward playback to rewind playback, and the load applied to the supply reel stand prevents the magnetic tape from being wound in stages. Only a light load will be applied. This makes it impossible to reliably stop the supply reel stand at the same time as the take-up reel stand stops after the fast-forward reproduction is completed. That is, as described above, the magnetic tape becomes loose as it separates from the drawer member, causing problems such as damage to the magnetic tape and disturbances in the rise of the image during rewinding and reproduction.

(C) Means for Solving the Problems The present invention has been made to solve the above problems, and provides magnetic recording and/or playback that performs rewind playback from normal playback through slight fast-forward playback. The apparatus includes a brake means that presses against the rotating body with its first elastic force and applies a first load, and a tape loading means that the magnetic tape is pulled out by a pull-out member and wound around a cylinder. an interlocking means that interlocks; an engaging portion that engages with the interlocking means against the second elastic force; a control means for applying a second load to the rotating body; and a control unit for applying a second load to the rotating body; It has a pressing part that is interlocked with the transition to reverse playback and presses the brake means to release the second load applied to the rotating body, This is a torque control device for a rotating body, which includes a moving means that releases the pressure of the pressing portion against the brake means.

(E) Effect 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 brake means applies the first load to the rotating body. 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 tape loading is completed and the engagement with the interlocking means and the engaging portion is released. A load of 2 is given,
As a result, the moving speed of the pull-out means during tape loading can be varied, and a good tape loading operation can be achieved.

Furthermore, when rewinding playback via fast-forward playback from the normal playback state, the pressure of the pressing portion against the brake means is released at the time of transition from fast-forward playback to rewind playback, so a second load is applied to the rotating body. This ensures that the rotating body stops after fast-forward playback, and the slack in the magnetic tape is removed.
Good rewind playback is achieved.

(f) Examples The details of the present invention will be specifically explained by referring to illustrated examples.

FIGS. 1 to 5 are planes showing stop, mid-tape loading, playback, transition from fast-forward playback to rewind playback, and rewind playback states, respectively, in a magnetic recording and/or playback device using the present invention. figure,
6 is a plan view of essential parts of the present invention, FIG. 7 is a side view of FIG. 6, and FIG. 8 is an exploded side view of FIG. 7. To explain the drawing numbers and configurations of FIGS. 1 to 8, 1 is a chassis having tape loading grooves 2 and 3, and 4 and 5 are the loading grooves 2 and 3, respectively.
rollers 16 and 1 are provided in a tape cassette (not shown) for storing a magnetic tape 8 shown in two-dot chain lines;
7 and 18 are tape guides, 19 is an impedance roller, 20 is a full width erase head, 21 is an audio erase head, 22 is an audio/control head, 2
Reference numerals 5 and 26 indicate a supply reel stand and a take-up reel stand as rotary bodies which are rotatably coupled to the chassis 1, and 27 a cam having guide grooves 28 and 29 and rotated by transmission of driving force; 9 has a pinch roller that presses against the capstan 23 in conjunction with the rotation of the cam 27; 9 has a loading post 10 and an inclined pole 11 that pull out the magnetic tape 8; A drawing member 12 that moves in the groove 2 is a loading post 13 and an inclined pole 14 for drawing out the magnetic tape 8.
15 is a cylinder around which the magnetic tape 8 pulled out by the drawer members 9 and 12 is wound, and 30 is a drawer member that moves in the loading groove 3 in conjunction with the rotation of the cam 27; Said guide groove 2
A tension arm 34 serves as an interlocking means having a pin 31 guided by a pin 31 and elastically held in a counterclockwise direction around a support shaft 33 by a spring 32 locked at one end of the tension arm. A band brake 35 is engaged between the tension arm 30 and the tension arm 30 and is in pressure contact with the side surface of the supply reel stand 25. The band brake 35 has a pin 36 guided in the guide groove 29, and pressing protrusions 37 and 38 as pressing parts. , said cam 2
A moving lever 39 as a moving means that moves left and right in conjunction with the rotation of 7 has a branch 40, and a support shaft 42 is supported by a spring 41 held at one end of the branch 40.
The magnetic tape 8 is elastically held counterclockwise around the center and pressed against the side surface of the take-up reel stand 26, and is used to prevent the magnetic tape 8 wound around the take-up reel (not shown) in the tape cassette from winding at high speed. Brake pieces 44 and 43, which are commonly used during fast forwarding, rewinding and tape loading, are made of resin, and a support shaft provided integrally with the chassis 1, and a locking pawl 45 having a taper 55. an insertion hole 47 into which the locking pawl 43 is inserted from the side made wider by the step 46; a shaft hole 57 into which the support shaft 44 is inserted; an engaging portion 48 which engages with the tension arm 30;
and a biasing portion 49, and the support shaft 4 is
A control arm serving as a control means is elastically held in a clockwise direction around 4, a flange 53 having a taper 56 and being locked to the locking pawl 43, and a support shaft 4;
4 is inserted into the shaft hole 58, and a protrusion 52 is provided which is biased by the biasing portion 49. It is elastically held in the clockwise direction at the center and pressed against the side surface of the supply reel 25, and is used to prevent the magnetic tape 8 wound around the supply reel (not shown) in the tape cassette from being wound in stages during high-speed fast forwarding and rewinding. This is a brake piece used as a brake means for tape loading.

Here, a method for attaching the control arm 45 and brake piece 51 to the chassis 1 will be explained. In FIG. 8, the locking pawl 43 is first inserted through the insertion hole 47 on the side made wider by the step 46, and the support shaft 44 is inserted into the shaft hole 57. At this time, since the diameter of the shaft hole 57 is larger than that of the support shaft 44, the locking pawl 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 pivotally support the brake piece 51, and the elasticity of the locking pawl 43 made of resin is used to bring the flange 53 into contact with the tapers 55 and 56. 43. At this time, the flesh pressure around the shaft hole 58 is inserted into the diameter difference between the shaft hole 57 and the support shaft 44, and the control arm 45 is also placed in a state where it is pivotally supported by the support shaft 44. From this, the control arm 45 and brake piece 51 can be easily and securely attached to the chassis 1 as shown in FIGS. 6 and 7.

First, in the stopped state shown in FIG.
is housed in the tape cassette without being pulled out by the pull-out members 9 and 12, and the tension arm 30 engages with the pull-out member 9 against the elastic force of the spring 32, thereby applying tension to the magnetic tape 8. The band brake 34 is further spaced apart from the side surface of the supply reel stand 25 without being provided with one. On the other hand, since the control arm 45 engages with the tension arm 30 against the elastic force of the spring 50, the brake piece 51 is lightly pressed against the side surface of the supply reel stand 25 by the elastic force of the spring 54 alone. , that is, the magnetic tape 8 is placed on the supply reel stand 25.
A first load is applied to prevent step winding. Similarly, the brake piece 39 is also brought into pressure contact with the side surface of the take-up reel stand 26 by the elastic force of the spring 41, that is, a first load is applied to the take-up reel stand 26 as well to prevent the magnetic tape 8 from winding in stages. . In this state, high-speed fast forwarding and rewinding are possible.

When a playback button (not shown) on the device side is turned on to play back a predetermined signal recorded on the magnetic tape 8 from the above-mentioned stopped state, the cam 27 is activated as shown in FIG. 2 by a control signal from the system control. The driving force is transmitted to rotate clockwise. When the pin 36 is guided through the guide groove 29 by this rotation, the moving lever 35 moves to the right and pulls out the magnetic tape 8 from the supply reel in the tape cassette lit on the supply reel stand 25. The branch portion 40 is pressed downward by the pressing protrusion 38 only during the tape loading period when the tape is pulled out at 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 force greater than the elastic force of the spring 41. In other words, a load greater than the first load is applied to the take-up reel stand 26, and the winding The rotation of the take-up reel placed on the take-up reel stand 26 is stopped only during the tape loading period.

Further, when the pin 31 is guided through the guide groove 28 by the clockwise rotation of the cam 27, the spring 3
2 is also applied, and the tension arm 30 rotates counterclockwise about the support shaft 33. Then, the magnetic tape 8 is pulled out from the supply reel on the supply reel stand 25 to which the first load is applied to the drawer members 9 and 12.
When the tension arm 30 and the engaging portion 48 are separated from each other, the control arm 45 is rotated clockwise around the support shaft 44 by the elastic force of the spring 50. Then, the protruding piece 52 is urged by the urging section 49. From this brake piece 51
are brought into pressure contact with the side surface of the supply reel stand 25 by the pressure contact force caused by the elastic force of the springs 50 and 54. In other words, a second load greater than the first load is applied to the supply reel stand 25, and the drawer members 9, 12 is reduced from the state shown in FIG.

From the above-mentioned state, the cam 27 further rotates clockwise as shown in FIG. 3, and the drawer members 9 and 12 whose movement speed is reduced are pressed against the catchers 4 and 5, respectively, and their movement is restricted. At this time, since the inertial force during crimping is weakened, the magnetic tape 8 does not separate from the drawer members 9, 12 and loosen as shown by broken lines _a1 , _b1 in FIG. It is reliably wound around the cylinder 15.

When the pin 36 continues to be guided in the guide groove 29 by the clockwise rotation of the cam 27, the moving lever 35 further moves to the right, and the catchers 4, 5
After the drawer members 9 and 12 are pressed together, the branch portion 40 is released from the pressure by the pressing protrusion 38. Thereby, the brake piece 39 is lightly pressed against the side surface of the take-up reel stand 26 by the pressure contact force due to the elastic force of the spring 41, and a first load is applied to the take-up reel stand 26. Further, the protruding piece 52 is pressed by the pressing protruding piece 37, and the brake piece 51 and the control arm 45 are each pressed by the spring 5.
As a result, the supply reel stand 25 is slightly rotated counterclockwise about the support shaft 44 against the elastic force of the brake members 4 and 50, and the supply reel stand 25 is released from pressure contact by the brake piece 51.

Also, by rotating the cam 27 clockwise, the bin 3
1 is guided through the guide groove 28, the spring 32
The tension arm 30 further rotates counterclockwise around the support shaft 33 due to the elastic force of , and is wrapped around the tape guides 16, 17, 18 and impedance roller 19, and the full width erasing head 20,
Tension is applied to the magnetic tape 8 which is in contact with the audio erasing head 21 and the audio/control head 22 and is held between the capstan 23 and the pinch roller 24. At the same time, the counterclockwise rotation of the tension arm 30 brings the band brake 34 into pressure contact with the side surface of the supply reel stand 25, in other words, a load necessary for regeneration is applied to the supply reel stand 25. As the take-up reel stand 26 rotates clockwise at a low speed, the supply reel stand 25 also rotates clockwise at a low speed, and the predetermined signal recorded on the magnetic tape 8 is reproduced.

From the above playback state, when the rewind button (not shown) on the device side is turned on to execute rewind playback which eliminates the need for tension by the tension arm 30 on the magnetic tape 8, control from the system control Cam 2 is activated by the signal as shown in Figure 4.
7 rotates slightly counterclockwise. When the pin 31 is guided through 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, and At the same time as the tension is released, the pressure contact of the band brake 34 against the supply reel stand 25 is also released. At this time, in order to remove the slack in 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 clockwise at a slightly high speed to perform fast-forward playback.

When the fast-forward playback is finished, the pinch roller 24 is separated from the capstan 23, and the counterclockwise rotation of the cam 27 moves the pin 36 into the guide groove 23.
The branch portion 40 is pressed against the pressing protrusion 38 by a slight movement of the moving lever 35 to the left. As a result, the brake piece 39 is brought into pressure contact with the side surface of the take-up reel stand 26 with a pressure force greater than the elastic force of the spring 41, and a load greater than the first load is applied to the take-up reel stand 26, ensuring that the fast-forward playback ends simultaneously. Stop at. Furthermore, the protruding piece 52 is released from the pressure by the pressing protruding piece 37, and the brake piece 51 and the control arm 4
5 are slightly rotated clockwise about the support shaft 44 by the elastic force of springs 54 and 50, respectively. As a result, the brake piece 51 is brought into pressure contact with the side surface of the supply reel stand 25 by the pressure contact force caused by the elastic force of the springs 50 and 54, and the supply reel stand 25 is applied with a second load and the magnetic tape is simultaneously stopped when the take-up reel stand 26 is stopped. 8
Stops reliably without giving any slack.

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 stand 25 when moving from the aforementioned fast-forward playback to rewind playback is only the first load, which is light enough to prevent the magnetic tape 8 from winding in stages. stand 2
The supply reel stand 25 could not be stopped reliably at the same time as the magnetic tape ₆ stopped, and as shown in _FIG . However, this problem is solved by the present invention, and the magnetic tape 8 is held wrapped around the loading posts 10, 13 and the inclined poles 11, 14 without loosening.

Thereafter, the cam 27 is slightly rotated clockwise by a control signal from the system control, and the pins 31 and 36 are guided through the guide grooves 28 and 29, respectively, and the brake piece 39 is moved by the spring as in the regeneration state described above. The brake piece 51 is brought into pressure contact with the side surface of the take-up reel stand 26 by the pressure contact force due to the elastic force of the brake member 41, and the brake piece 51 is separated from the side surface of the supply reel stand 25. Furthermore, with the band brake 34 spaced apart from the side of the supply reel stand 25, the tension arm 30 is attached to the spring 3.
The magnetic tape 8 is slightly rotated clockwise about the support shaft 33 against the elastic force of the magnetic tape 8 . As the supply reel stand 25 rotates counterclockwise at high speed, the take-up reel stand 26 also rotates counterclockwise at high speed, and good rewinding and playback is performed.

It should be noted that the tape unloading and other operations for transitioning from the playback state to the stop state are the opposite operations to those described above, and therefore their explanation will be omitted.

(g) Effects of the Invention According to the rotating body torque control device of the present invention, the movement of the drawer member during tape loading can be varied with a simple configuration, so that the inertial force applied to the drawer member when tape loading is completed is reduced. is sufficiently weakened. As a result, the magnetic tape is reliably wrapped around the drawer member when tape loading is completed, and damage to the magnetic tape is prevented, and a good image rise can be obtained with a short tape loading time.

In addition, when performing rewind playback via fast forward playback from the normal playback state, slack in the magnetic tape can be easily removed using the above-mentioned configuration when moving from fast forward playback to rewind playback, and from this point on, the slack in the magnetic tape can be easily removed. Similarly, damage to the magnetic tape is prevented, and a good image rise can be obtained during rewinding and reproduction.

Furthermore, the number of parts is reduced due to the simpler configuration, which provides advantages such as improved reproducibility, cost reduction, and the ability to reduce the size and weight of the device.

[Brief explanation of the drawing]

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 plan view of essential parts of the present invention, 7th
The figure is a side view of FIG. 6, and FIG. 8 is an exploded side view of FIG. 7. 8... Magnetic tape, 9, 12... Drawer member,
15... Cylinder, 25... Supply reel stand, 30
...Tension arm, 35...Movement lever, 3
7...Press projection piece, 45...Control arm, 48...
Engagement part, 49... urging part, 51... brake piece.

Claims (1)

[Scope of Claims] 1. Braking means having an engaging protrusion and biased by a first elastic force to apply a first load to the rotating body; A tape pull-out member for loading and unloading, an interlocking member interlocking with the tape pull-out member, an engaging portion biased by a second elastic force and engaging the interlocking means at one end, and the other end. a control means for applying a second load to the rotating body by engaging with the engaging protrusion, and a moving means having a pressing part that engages with the engaging protrusion and is interlocked with an operation mode switching cam. and three modes in which the first load or the second load is applied to the rotating body, or there is no load on the rotating body, by the operation of the operation mode switching cam. A torque control device for a rotating body characterized by: