JPH0528585Y2 - - Google Patents

Description

[Detailed Description of the Invention] (A) Field of Industrial Application The present invention relates to a reel stand rotation control device for controlling the rotational force of the reel stand in accordance with a mode in a magnetic recording and/or reproducing device.

(B) Prior Art Conventionally, as a rotation control device for a reel stand provided in a magnetic recording and/or reproducing device, which controls the rotational force of a reel stand provided in accordance with the mode, for example, Japanese Patent Application Laid-Open No. 1986-
Techniques such as No. 109046 have been presented. To briefly explain this technology, it is configured to vary the pressure contact force of a pair of brake pieces that rotate around each support shaft and press against a pair of reel stands, and one end of each individual spring is connected to a pair of brake pieces. At the same time, each other end of the spring is locked to one end of a link mechanism using another support shaft, and the pressure force of the brake piece against the reel base is applied by moving the link mechanism according to the mode. That is, the rotational force of the reel stand was varied.

(c) Problems to be solved by the invention However, in the above case, since the spindle of the link mechanism connected to the brake piece through the spring is different from the spindle of the brake piece, it is difficult to miniaturize the main body of the device. Furthermore, since each support shaft must be processed and attached to the chassis, there are problems such as increased costs and decreased workability.

(d) Means for solving the problem The present invention was made to solve the above problem, and includes a support shaft and a pawl provided on the chassis, and a first support shaft inserted into the support shaft. A brake piece having a shaft hole and pressed against the reel stand by its first elastic force; a second shaft hole inserted into the support shaft; and a brake piece that engages the moving body against the second elastic force. a control arm having an engaging portion that engages with the moving body, a biasing portion that biases the brake piece with the second elastic force when the movable body and the engaging portion are disengaged; This is a rotation control device for a reel stand, which includes a locking portion that is provided on either one of a brake piece or a control arm and that is locked to the claw portion.

(E) Effect According to the rotation control device for a reel stand of the present invention, the brake piece having the first shaft hole and the control arm having the second shaft hole are supported by the same support shaft, and the brake piece has the first shaft hole. It is easily connected to the chassis by the locking of the part and the locking part, and furthermore, this configuration reliably controls the rotational force of the reel stand.

(f) Examples The details of the present invention will be explained in detail with reference to illustrated examples.

Figures 1 to 5 show stop, mid-tape loading, playback, transition from fast-forward playback to rewind playback, and rewind playback states in a magnetic recording and/or playback device using the present invention, respectively. A plan view, FIG. 6 is a plan view of the main part of the present invention, and FIG.
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 loading grooves 2 and 3, 4 and 5 are catchers provided at the ends of the loading grooves 2 and 3, respectively, and 6 and 7 are Rollers 16, 17, and
18 is a tape guide, 19 is an impedance roller, 20 is a full width erase head, 21 is an audio erase head, 22 is an audio/control head, 25, 2
6 is a supply reel stand and a take-up reel stand rotatably coupled to the chassis 1; 27 is a guide groove 28;
29, a cam that rotates when driving force is transmitted;
Reference numeral 24 has a pinch roller that is interlocked with the rotation of the cam 27 and is pressed against the capstan 23; 9 is a loading post 10 that pulls out the magnetic tape 8 and a tilted pole 11; a drawer member that moves in the loading groove 2;
12 has a loading post 13 and an inclined pole 14 for pulling out the magnetic tape 8;
A drawer member 15 moves in the loading groove 3 in conjunction with the rotation of the drawer member 9, 12.
The cylinder 30 around which the magnetic tape 8 pulled out at is wound has a pin 31 guided in the guide groove 28, and a spring 3 fixed to one end of the pin 31.
2, a tension arm 34 as a moving body elastically held in a counterclockwise direction around a support shaft 33;
35 has a band brake that is locked between the chassis 1 and the tension arm 30 and presses against the side surface of the supply reel stand 25; 35 has a pin 36 guided in the guide groove 29; and pressing protrusions 37 and 38. ,
The moving lever 39, which moves left and right in conjunction with the rotation of the cam 27, has a branch 40, and is elastically held in a counterclockwise direction about a support shaft 42 by a spring 41 locked at one end thereof. The magnetic tape 8 is 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 in stages during high-speed fast forwarding and rewinding, and during tape loading. Brake pieces that are sometimes shared, 4
Reference numerals 4 and 43 refer to a support shaft which is made of resin and is provided integrally with the chassis 1, and a locking pawl as a pawl portion having a taper 55; It has an insertion hole 47 into which the claw 43 is inserted, a second shaft hole 57 into which the support shaft 44 is inserted, an engaging part 48 which engages with the tension arm 30, and a biasing part 49, one end of which A control arm 51 is elastically held in a clockwise direction about the support shaft 44 by a second elastic spring 50 that is locked to the control arm 51, which has a taper 56 and is locked to the locking pawl 43. A collar portion 53 as a locking portion,
A first shaft hole 58 into which the support shaft 44 is inserted, and a protrusion 52 biased by the biasing portion 49 are provided, and a first elastic spring 54 retained at one end of the protrusion 52 is provided. The magnetic tape 8 is elastically held in a clockwise direction around the support shaft 44 and pressed against the side surface of the supply reel stand 25 to prevent the magnetic tape 8 wound around the supply reel (not shown) in the tape cassette from being wound in stages. This is a brake piece that is commonly used during high-speed fast forwarding and rewinding as well as during 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, the control arm 45
This prevents the brake piece 51 from coming off. At this time, the wall thickness 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. Note that the configuration and attachment method of the control arm 45 and brake piece 51 are not limited to those described above.

That is, the protruding piece 52 of the brake piece 51 may be provided in the vertical direction, the collar portion 52 may be provided on the control arm 45, and the order in which the brake piece 51 and the control arm 45 are attached may be reversed.

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 placed 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 by the 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 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.

When the cam 27 further rotates clockwise from the above-mentioned state as shown in FIG. 3, the drawer members 9 and 12, whose moving speeds have been reduced, come into contact with 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, as the cam 27 rotates clockwise, the pin 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 at the time of transition from the above-mentioned fast forward playback to rewind playback is the load applied to the magnetic tape 8.
Only the first load is light enough to prevent step winding.
As a result, after the fast-forward playback is finished, the supply reel stand 25 cannot be reliably stopped at the same time as the take-up reel stand ₂₆ is stopped. In other _words , as shown in FIG. , 12, but this problem has been solved by the present invention, and the magnetic tape 8 can be attached to the loading posts 10, 13 and the inclined pole 1 without loosening.
It is held in a state where it is wrapped around 1 and 14.

Thereafter, the cam 27 is slightly rotated clockwise by a control signal from the system control, and when the pins 31 and 36 are guided into the guide grooves 28 and 29, respectively, 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 will not be described.

(g) Effects of the invention According to the reel stand rotation control device of the invention, the brake piece and control arm that control the rotation of the reel stand can be easily connected to the same support shaft on the chassis, and the number of component parts can be further reduced. Therefore, advantages such as miniaturization of the main body of the apparatus, improvement of workability, and cost reduction can be obtained.

[Brief explanation 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 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. 1... Chassis, 25... Supply reel stand, 30
...Tension arm, 43...Latching claw, 44...
... Support shaft, 45 ... Control arm, 48 ... Engagement part,
49...Biasing part, 51...Brake piece, 53...
Flange, 57, 58...shaft hole.

Claims (1)

[Claims for Utility Model Registration] A brake piece that includes a support shaft and a locking pawl provided on the chassis, and an engaging protrusion that is pivotally supported by the support shaft and presses against the reel stand with a first elastic force. and an urging part that is coaxially supported by the support shaft with the brake piece and that comes into contact with the engagement protrusion and urges the brake piece with a second elastic force; a control arm having an engaging portion that engages with the movable body against the movement; a locking portion that is locked to the locking pawl on either the brake piece or the control arm; A rotation control device for a reel stand, characterized in that a control arm is rotatably locked to the support shaft.