JP2954739B2 - Cam operation mechanism of magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cam operating mechanism of a magnetic recording / reproducing apparatus for operating a mechanical element by using an operating member, and more particularly to a cam operating mechanism capable of moving a mechanical element at high speed in accordance with an operation direction. About.

[0002]

2. Description of the Related Art In a conventional cam operating mechanism of a magnetic recording / reproducing apparatus, a driving force is transmitted from a loading motor to a mode gear by a gear train, and each tape operating mode (fast forward, rewind, recording, reproducing, still) is transmitted by a mode gear. , Search, etc.), the cam and the cam slider are operated.

[0003] Mechanical elements of a mode operation mechanism driven in accordance with a mode operation (main brake, supply side sub brake, winding side sub brake, tension arm, etc.)
Is constituted by a simple mechanism in which the operation is controlled by a cam provided on the side surface of the operation member. The cam surface of the operating member is provided with a constant angle θ so that the mechanism element can smoothly move thereon, and the mechanism element moves on the same cam surface regardless of the moving direction of the operating member. Was.

[0004] The cam operation mechanism is a mechanism for converting the direction of operation and the amount of operation, and is employed in a variety of devices. For example, as described in Japanese Patent Application Laid-Open No. 58-60450, there is a video tape recorder in which an operation member is provided with a cam portion extending in the moving direction. These various cam operating mechanisms include: 1) fast forward / rewind,
In a mode operation such as 2) stop, 3) recording / playback, 4) reverse playback, etc., a mechanical element such as a) brakes, b) operation of a pinch roller arm, c) operation of a tension control arm is switched to a predetermined mode. Has been used for.

[0005]

In the above-mentioned prior art, one driving source is used, and two parts of a tape mounting means and an operation mode switching means are used.
It is effective to reduce the size and weight of the device and to improve the assembling work of the device. No consideration is given to shortening the moving time of the mechanism element on the way. As an example, considering a brake operation of a magnetic recording / reproducing apparatus, when a member for operating a braking force is operated by a mechanical element to apply a brake, an instantaneous operation is performed, which is effective in preventing tape slack. There is. On the other hand, the time required during the mode switching is determined by the predetermined angle θ of the cam because the operation member moves at a predetermined speed. However, in the above-described conventional technique, the angle θ cannot take a large value close to the vertical in order to smoothly operate the mechanical element.
There is a problem in that time is required during the mode switching, and it is not possible to prevent tape loosening.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cam operating mechanism which eliminates the above-mentioned problems of the prior art and can reduce the moving time of the mechanical element during mode switching.

[0007]

In order to achieve the above object, according to the present invention, an angle of a cam surface where a mechanism element contacts an operation member which moves in response to an operation input from the outside is changed. An operation plate supported rotatably as described above is mounted.

According to a fourth aspect of the present invention, there are provided first and second operating members having cam surfaces having different gradients, means for moving the operating members at mutually different speeds, and engaging with the cam surface. And a moving mechanism element.

[0009]

According to the first aspect of the present invention, when the operating member moves in a predetermined direction, the mechanical element moves while being pressed against the cam surface, so that the angle can be changed. Moves continuously. When the operating member moves in the opposite direction, the operating member forming the cam surface is angled by the biased spring, and the mechanism element instantaneously moves on the cam surface. Therefore, it is possible to reduce the moving time of the mechanical element when the mode of the magnetic recording / reproducing apparatus is switched. According to the second aspect of the present invention, the moving speeds of the first and second operating members are changed, and the mechanism element is moved from the first position to the second position.
The operation member to be engaged with the mechanical element is switched between the case of moving the mechanical element to the first position and the case of moving the mechanical element from the second position to the first position. It has become possible to shorten the travel time.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings. 1 and 2 are configuration diagrams of a main part of a magnetic recording / reproducing apparatus using the present invention. FIG. 1 is a view from the front, and FIGS. 2 and 3 are views from the back. is there.

In FIG. 1, 1a is a main chassis, 1
b is a sub-chassis, 2 is a cylinder, 3 is a loading motor, 4 is an input side tape pull-out member, 5 is an output side tape pull-out member, and 61 and 62 are loading arms. Reference numeral 6 denotes a supply side reel base, 7 denotes a take-up side reel base, 8 denotes a tension arm, 9 denotes a capstan, 10 denotes a pinch roller, and 1 denotes a pinch roller.
3a and 13b are main brakes, 14a is a supply side sub brake, 14b is a take-up side sub brake, 15 is a tape cassette (indicated by a two-dot chain line), 16a is an input side loading gear, 16b is an output side loading gear, and 44, 45,
46 is an idler gear, 47 is an inhibit arm, 48
Is an idler arm, and 50 is a tension band. In FIG. 2, 20, 21, 22, 23 and 24 are reduction gears, 25 is a cam gear, 26 is a cam groove, 27 is a fan gear, 2
8 is a drive gear, 30 is a mode gear, 31 is a reduction gear, 1
00 is an operation member, 33 is an operation lever, 35 is a brake operation lever, 40 is a capstan motor, 41 is a motor pulley, 42 is an idler pulley, and 43 is a belt.

Next, the operation of this embodiment will be described. In FIG. 1, the loading motor 16 is driven by the loading motor 3 into reduction gears 20, 21, 22, 2,
3, 24, the cam gear 25, the fan gear 27, and the drive gear 28 to reduce the drive speed.
b is driven by obtaining driving force from the entry side loading gear 16a. Entry and exit loading gears 16a, 16
When b is driven, the input side tape pull-out member 4 and the output side tape pull-out member 5 connected to the loading arms 61, 62 attached to the loading gears 16a, 16b are driven. The drive gear 28 has two stages,
A gear (not shown) meshes with the fan gear 27. The driving force transmitted from the cam gear 25 to the mode gear 30 via a switching mechanism described later is transmitted to the operation member 10 by the reduction gear 31 and the rack 100 c provided on the operation member 100.
0 is transmitted. Thereby, the operation member 100 is driven. The upper cam portion of the operating member 100 has the shaft 35a as a fulcrum, and the brake operating lever 3 urged counterclockwise.
5 is engaged with the second member 35 of the lever 35.
The drive member 13 of the main brakes 13a and 13b is linked to b. On the other hand, in the lower cam portion of the operation member 100,
Supply side sub brake 14a, winding side sub brake 14b
Drive members are engaged. As a result, due to the movement of the operation member 100, those mechanical elements perform press-contact / separation operations with both the supply-side and take-up-side reel stands 6,7.

The idler gear 44 shown in FIG. 1 is driven from a pulley 41 engaged with the capstan motor 40 via a belt 43, an idler pulley 42, and a gear (not shown) coaxial with the idler pulley 42. Is done. The idler gear 45 obtains a driving force from the idler gear 44 and transmits the driving force to the supply-side reel table 6, or the idler gear 46 transmits the driving force to the winding-side reel table 7 in accordance with the lateral movement of the idler arm 48. The idler arm 48 is provided with a rising portion 48b, which comes into contact with the inhibit arm 47 engaged with the winding-side sub-brake 14b, so that the winding-side reel base 7 is not used during normal running. , So that the idler gear 46 operates so as not to be engaged. The driving force is transmitted to the pinch roller 10 via the loading gear 16b and the driving gears 90 and 91.

Next, with reference to FIG. 4, the cam operation mechanism as a main part of this embodiment will be described in detail. FIG. 4 is an enlarged view of a portion surrounded by a dashed line in FIG. 3, and shows a state in which the operation member 100 has moved left (in the direction of arrow H).

In FIG. 4, a plate 101 different from the operation member is mounted on the operation member 100 so as to be freely rotatable about a pin 102 set on the operation member 100. 103 and 104 are stoppers fixed to the operation member 100 to prevent the plate 101 from rotating too much around the pin 102. 105 is the operation member 1
00 and a spring for urging the plate 101.

According to the cam operating mechanism having the above structure, the plate 1
When the operation member 100 is moved in the direction of the arrow F, the end of the mechanical element 35 that is in contact with the cam surface 101a formed on the side surface of the plate 01 is moved to the plate 10 as shown in FIG.
It instantaneously moves to the first cam surface 100b. As a result, it is possible to shorten the moving time of the mechanism element 35 at the time of mode switching.

On the other hand, when the operating member 100 is moved in the direction of arrow H, the plate 101 is pressed by the mechanical element 35, so that as shown in FIG. Change. Thereby, the mechanical element 35
Can smoothly move on the cam surface of the plate 101.

In this embodiment, the operating member 100 is linear, but may be an arc-shaped or annular operating member.

When the present embodiment having the above configuration is applied to a magnetic recording / reproducing apparatus, it is possible to reduce the TR time in the mode transition TR of the magnetic recording / reproducing apparatus shown in Table 1. For example, the operation of LSTOP (loading stop) from FF / REW is performed rapidly, and tape slack can be prevented.

[0020]

[Table 1] Next, a second embodiment of the cam operating mechanism of the present invention will be described. 7, reference numerals 110 and 120 denote first and second operating members having different cam surfaces, 35 denotes a mechanical element,
30 and 140 are motors, 131, 132, 133 and 14
1, 142, 143 are reduction gears. 8, 9, and 10, reference numerals 110a, 110b, and 110c denote cam surfaces of the first operation member 110, 120a, 120b, and 110a.
120c is a cam surface of the second operation member 120,
Operating member 110 has a cam surface 110b having a gentle slope.
The second operating member 120 is a cam surface 12 having a steep slope.
0b. In the drawing, the two operating members are not necessarily shown to be overlapped for the sake of explanation, but originally overlap.

In FIG. 7, the first operation member 110 is
By the motor 130, the reduction gears 131, 132, 13
(3) The operation member 110 is decelerated via the rack 110d. Similarly, the second operating member 120 is also driven by the motor 140 to be reduced via the reduction gears 141, 142, 143 and the rack 120d of the operating member 120.

As shown in FIG. 8, the reduction ratio of the motors 130 and 140 (not shown) is determined so that the mechanism element 35 moves while being in contact with the cam surfaces 110b and 120b of the operating member at the same time. . First and second operation members 110, 1
By moving the first operation member 110 faster than the operation member 120 when moving 20 in the J direction, the cam surfaces 110c and 12c are moved through the state of FIG.
It is possible to bring the mechanism element 35 into contact with 0c. On the other hand, when the first and second operation members 110 and 120 are moved in the direction I, the first operation member 110 is similarly moved faster than the second operation member 120 to change the state of FIG. The state shown in FIG. 8 can be obtained through the state shown in FIG. At this time, the mechanism element 35 has the cam surfaces 110c, 1
It instantaneously moves from 20c to the cam surfaces 110a, 120a.

It should be noted that the number of operating members abutting on the mechanism element 35 may be one instead of two at the same time.

Next, FIGS. 11, 12 and 13 show modifications of the second embodiment in which the cam inclined surface of one of the operation members is at a right angle.

Here, 150 and 160 are first and second operating members, 150a, 150b and 150c are cam surfaces of the first operating member 150, and 160a, 160b and 160c are cam surfaces of the second operating member 160. It is. In FIG.
A cam surface 160 provided on a side surface of the second operation member 160
c is in contact with the cam surface 160c.
, The second operating member 160
Moves in the direction of arrow I, so that the mechanical element 35 is moved to the cam surface 150 of the first and second operation members as shown in FIG.
a, 160a, and the moving time of the mechanism element 35 at the time of mode switching can be reduced. To switch back to the previous mode (FIG. 11), the first operation member 150
Is moved at a high speed in the J direction to reduce the mode switching time, and the mechanism element 35 is moved to the cam surface 1 of the first operating member 150.
First, it is brought into contact with 50c. After that, the mechanical element 35 is
The second operation member 160 is moved in the J direction in order to contact the cam surface 160c of the operation member 160 of FIG.
reference). Further, the first operation member 150 moves in the direction I so as to be able to cope with the next high-speed mode switching and stands by (FIG. 1).
1). In this embodiment, the first and second operation members 15 are used.
Although the two motors are used to move 0 and 160,
This may be configured by one motor with a switching mechanism.

The operating members 110, 120, 150,
Although 160 is a straight line, it may be an arc-shaped or annular operation member.

Also, in the first and second embodiments, the present invention has been described as an example in which the present invention is applied to a mechanism element for driving a main brake. However, the present invention is not limited to this. The present invention can also be applied to a mechanism element used for pressure bonding, detachment, and the like of a member, for example, a pinch roller to a capstan.

Next, each mode of the magnetic recording / reproducing apparatus provided with the present invention will be described mainly with reference to FIGS.

In the stopped state, the main brakes 13a, 13b, the supply side sub-brake 14a, and the winding side sub-brake 1
4b is pressed. After mounting the tape cassette 15,
When the operator selects the recording / playback mode, the loading motor 3 starts rotating in the loading direction, and the reduction gear 2
The cam gear 25 starts rotating via 0, 21, 22, 23, 24. The rotation of the cam gear 25 causes the mode gear 30 to rotate.
Rotate, and the operation member 100 moves in the H direction in FIG. 4 to release only the main brakes 13a and 13b. The supply side sub-brake 14a and the take-up side sub-brake 14b are kept pressed against both the supply side and take-up side reel bases 6,7.

When the rotation of the cam gear 25 further proceeds, a loading (LOADING) mode is set, and the cam gear 25
The fan gear 27 which is engaged with the cam groove 26 provided at the start of rotation starts rotating, the input side loading gear 16a and the output side loading gear 16b rotate, and the loading arm 6 is rotated.
The magnetic tape is drawn from the tape cassette 15 and wound around the cylinder 2 by moving the input tape pull-out member 4 and the output tape pull-out member 5 via the first and the second 62.

Thereafter, the operator fast-forwards / rewinds (FF /
When the (REW) mode is selected, the press-contact of the winding-side sub brake 14b of the winding-side reel stand 7 is released, and fast-forwarding or rewinding proceeds. At an appropriate timing, the operator stops the STOP mode.
When the operation mode is selected, for example, the operation member 100 moves in the direction F in FIG. 4, and the main brakes 13a and 13b
The two reel bases on the winding side are pressed, and the magnetic tape stops.
At this time, the main brakes 13a and 13b momentarily press the supply-side and take-up-side reel bases by the cam operating mechanism of the present embodiment, and the brakes are instantaneously applied to the both reel bases. As a result, the slack of the magnetic tape at the time of the STOP mode transition can be sufficiently prevented.
The winding side sub-brake 14b presses the winding side reel base 7 again. During this fast-forward / rewind operation,
No pressure is applied to the feeder, the supply side sub brake 14a is kept in pressure contact, and the tension arm 8 is kept regulated.

Next, when the recording / playback mode is operated,
Supply side sub-brakes of both supply side and take-up reel stands 6, 7
The pressure contact between the key 14a and the winding side sub-brake 14b is released, and at the same time, the regulation of the tension arm 8 is released, so that the tension pin implanted in the tension arm 8 becomes a magnetic tape.
When the pinch roller 10 comes into contact with the capstan 9 and presses the capstan 9 to hold the magnetic tape, the idler gear 46 is engaged with the take-up reel stand 7 for winding the magnetic tape. The recording / playback mode is set.

In the search mode, in the case of normal rotation, the mode is
The mechanism elements are the same as those in the recording / reproducing mode and the capstan 9
Rotates at high speed.

In the reverse search mode, the loading mode is used.
The take-up side sub-brake 14b is pressed against the take-up reel base 7 by the lower cam portion provided on the operation member 100 as the rotor 3 rotates in the loading direction. Also, take-up side sub brake 1
The press arm 4b rotates the inhibitor arm 47, and the idler arm 48 is separated from the winding reel base 7. The other mechanical elements are controlled by a cam provided on the operation member 100, and the pinch roller is controlled by a cam groove 26 provided on the cam gear 25 so as not to operate.
Then, the magnetic tape held between the capstan 9 and the pinch roller 10 is fed in the reverse direction by the reverse rotation of the capstan motor, and the idler 45 is supplied by the supply reel.
The magnetic tape is engaged with the reel table 6 to wind the magnetic tape around the supply reel in the tape cassette to perform a reverse search. The operation of the mechanical element in each mode when the mode progresses in the order in which the loading motor 3 rotates in the loading direction has been described above. The same applies to the case where the mode advances in the reverse direction. Is performed.

Next, the switching mechanism of the drive gear will be described. FIG. 14 is an exploded view showing the structure of the cam gear 25, the sector gear 27, and the mode gear 30 constituting the drive gear. The cam gear 25 is engaged with the reduction gear 24 and the sector gear 2 is formed.
A gear portion 70 having a cam groove 26 for driving the motor 7, a side cam portion 71 for controlling the rotation of the mode gear 30, and a gear portion 72 for engaging with the mode gear 30 and transmitting the driving force are formed in a three-layer structure. I have. Next, the fan gear 27 is the cam groove 2 of the cam gear 25.
6 engages with a pin 74 erected on the fan gear 27, and rotates about the shaft 73 erected on the chassis 1 a by rotation of the cam gear 25. The mode gear 30 is composed of a gear portion 75 that engages with the gear portion 72 of the cam gear 25 to transmit the driving force from the reduction gear 24, and a side cam portion 76 that engages with the side cam portion 71.

Next, an operation method for switching the driving force from the loading motor 3 by the cam gear 25 between the loading mechanism side and the mode operation mechanism side will be described with reference to FIGS. I do. After installing the tape cassette 15,
The cam gear 25 shown in FIG. 15 rotates in the direction of the arrow A by an angle .theta.1, and the mode gear 30 is rotated by a gear 72 which rotates integrally with a gear portion 70 provided on the outer periphery of the cam gear 25 as shown in FIG. The driving force is transmitted to the operation member 100 via the operation member to operate the mode operation mechanism. During this time, the fan gear 27 that transmits the driving force to the loading mechanism does not operate due to the shape of the cam groove 26 provided in the cam gear 25.

In the range of the next angle θ2, the sector gear 27 rotates along the cam groove 26 of the cam gear 25 in the loading section. During this time, as shown in FIG.
Gear portion 75 engages with the notch side of the gear portion 72 of the cam gear 25, and further engages the convex side of the side cam portion 71 of the cam gear 25 with the notch side of the side cam portion 76 of the mode gear 30. The rotation of the mode gear 30 is stopped.

After the loading is completed, a mode operation is performed within the range of the next angle θ3. Fan gear 27
After the loading is completed, the pinch roller 10 is rotated to press the capstan 9 against the capstan 9 so that the magnetic tape can run. The mode gear 30 re-engages with the gear portion 72 of the cam gear 25 to transmit driving force to the operating member 100,
The mechanism elements are operated according to each mode.

[0039]

As is clear from the above description, according to the cam operating mechanism of the present invention, the time required during the mode switching can be shortened, and the mechanism element can be moved at high speed.
For example, the brake operation of the magnetic recording / reproducing device can be performed instantaneously. As a result, for example, it is effective in preventing tape slack. Further, the cam surfaces that can form different angles can be configured with a simple structure, and cost reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a main part of a magnetic recording / reproducing apparatus using the present invention.

FIG. 2 is a rear view of FIG.

FIG. 3 is a schematic diagram of an operation member, a mode gear, a reduction gear, and a mechanism element of the magnetic recording / reproducing apparatus.

FIG. 4 is an explanatory view of a cam operating mechanism according to the first embodiment of the present invention.

FIG. 5 is an operation explanatory view of the cam operating mechanism of FIG. 4;

FIG. 6 is an operation explanatory view of the cam operating mechanism of FIG. 4;

FIG. 7 is a schematic diagram of an operation member, a motor, a reduction gear, and a mechanism element of the magnetic recording / reproducing apparatus.

FIG. 8 is an explanatory view of a cam operating mechanism according to a second embodiment of the present invention.

FIG. 9 is an explanatory diagram of the operation of the cam operating mechanism of FIG. 8;

FIG. 10 is an operation explanatory view of the cam operating mechanism of FIG. 8;

FIG. 11 is a view showing a modification of the cam operation mechanism of the second embodiment.

FIG. 12 is an operation explanatory view of the cam operating mechanism of FIG. 11;

FIG. 13 is an explanatory diagram of the operation of the cam operating mechanism of FIG. 11;

FIG. 14 is an exploded perspective view of a cam gear, a fan gear, and a mode gear of the magnetic recording / reproducing apparatus.

FIG. 15 is an enlarged plan view of a cam gear.

FIG. 16 is a plan view of a driving force switching mechanism for a cam gear and a mode gear.

FIG. 17 is a partial explanatory view of a driving force switching mechanism of a cam gear and a mode gear.

[Explanation of symbols]

100, 110: operation member, 100a, 100b, 110a, 110b: cam surface of operation member, 100c, 100d: rack portion of operation member, 100d: guide portion of operation member 100, 101: member, 101a, 101b, 110c ... Cam surface of member 101, 102 pin, 103, 104 stopper, 105 spring

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidekazu Takeda 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Yokohama, Japan Inside the Media Research Laboratory, Hitachi, Ltd. Address: Hitachi, Ltd. Image Media Research Laboratory (72) Inventor Nobuyuki Kaku 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Hitachi, Ltd. Image Media Research Laboratory (56) References A) (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 15/22 G11B 15/18 G11B 15/10

Claims (5)

(57) [Claims] Cylinder mounted with a rotating magnetic head (2)
And a chassis part (1a, 1a) holding the cylinder (2).
b) and a cam surface (100a, 1a) movably attached to the chassis and moving in response to an external operation input.
00b), and a mechanism element (35) that engages with a cam surface of the operating member (100) to operate a member that operates the brake force of the reel base and a member that switches the running mode. And an operation plate (1) rotatably supported on an operation member (100).
01), the operation plate (101) has two different cam surfaces (101a, 101b), and the operation plate (101)
When the cam surface (101a, 10a) is in the first position,
1b) forms a cam surface having a predetermined first angle with respect to the operation member (100), and the operation plate (101) is
When the cam surface (101a, 101b) is at the position (1), the cam surface (101a, 101b) forms a cam surface having a different second angle (however, first angle> second angle) with respect to the operation member (100). A cam operating mechanism for the magnetic recording / reproducing apparatus, wherein the moving time of the mechanical element (35) is reduced by using the cam surface having the first angle. 2. A cam operating mechanism for a magnetic recording / reproducing apparatus according to claim 1, wherein said operating plate is biased to said first position. 3. An operation plate (1) is provided on the operation member (100).
A cam for a magnetic recording / reproducing apparatus according to claim 1 or 2, wherein a stopper (103, 104) for holding said first or second position at said first position or said second position is erected. Operation mechanism. 4. A cylinder (2) on which a rotating magnetic head is mounted.
And a chassis part (1a, 1a) holding the cylinder (2).
b) and a first operation member (11) movably attached to the chassis portion and moving in response to an operation input from the outside.
0), the second operating member (120), and the cam surface of the first operating member (110) are engaged to operate a member for operating the braking force of the reel base and a member for switching the running mode. A magnetic recording / reproducing apparatus comprising a mechanical element (35),
The first and second operating members (110) and (120) have first and second cam surfaces (110a, 110b,
110c), (120a, 120b, 120c) (where the gradient of the first cam surface <the gradient of the second cam surface), and the mechanism element (35) is moved from the first position to the second position. The first operating member is moved faster than the second operating member so that the second cam surface is used when moving and the first cam surface is used when moving from the second position to the first position. The mechanism element (3
5) The cam operating mechanism of the magnetic recording / reproducing apparatus, wherein the moving speed is reduced from the first position to the second position. 5. The first and second operation members (110, 12).
5. A cam operating mechanism for a magnetic recording / reproducing apparatus according to claim 4, wherein a rack (110d, 120d) is formed on each side surface of (0).