JPH04341960A - Cam operating mechanism for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide the cam operating mechanism of a magnetic recording and reproducing device which can shorten the moving time of a mechanism element at the time of mode switching in a mode operation using a cam. CONSTITUTION:The mechanism element 35 moves along a cam surface 101b of an operating plate 101 when an operating member 100 is moved in a direction F. The operating plate 101 is engaged with a stopper 104 and stopped by receiving the force rotating counterclockwise around a pin 102 implanted on the operating member 100. Since a nearly perpendicular cam surface is thereby formed, the mechanism element 35 operates rapidly. The instantaneous execution of a brake operation is possible and is effective for preventing, for example, the slack of the brake if this mechanism element is interlocked to the brake mechanism of a reel.

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 for a magnetic recording/reproducing device that operates a mechanical element using an operating member, and particularly to a cam operating mechanism that enables high-speed movement of a mechanical element depending on the operating direction. Regarding.

0002

[Prior Art] In the cam operating mechanism of a conventional magnetic recording and reproducing device, driving force is transmitted from a loading motor to a mode gear through a gear train, and the mode gear is used to transmit each tape operation mode (fast forward, rewind, record, playback, still , search, etc.), the cam and cam slider are operated.

Mechanical elements of the mode operation mechanism (main brake, supply side sub-brake, take-up side sub-brake, tension arm, etc.) that are driven according to the mode operation are as follows:
It consists of a simple mechanism whose operation is controlled by a cam provided on the side of the operating member. Further, the cam surface of the operating member is set at a certain angle θ so that the mechanical element can move smoothly thereon, and the mechanical element moves on the same cam surface regardless of the moving direction of the operating member. Was.

[0004] The cam operating mechanism is a mechanism for converting the direction of movement and the amount of movement, and is employed in a wide variety of devices. For example, as described in Japanese Unexamined Patent Publication No. 58-60450, there is a video tape recorder in which an operating member is provided with a cam portion extending in the direction of movement thereof. These various cam operating mechanisms are 1) fast forward/rewind, 2)
) To switch mechanical elements such as a) brakes, b) pinch roller arm operation, and c) tension control arm operation to a predetermined mode in mode operations such as ) stop, 3) recording/playback, and 4) reverse playback. used in

[0005]

[Problems to be Solved by the Invention] In the above-mentioned prior art, one drive source is used for both the tape mounting means and the operation mode switching means.
It is configured so that two mechanical means can be switched accurately and in good coordination by switching their loads, so it is effective in reducing the size and weight of the device and improving the assembly work of the device. No consideration is given to shortening the travel time of mechanical elements along the way. As an example, considering the brake operation of a magnetic recording/reproducing device, when a mechanical element operates the brake force control member to apply the brake, it is effective to prevent the tape from loosening if the brake is applied instantaneously. There is. On the other hand, the time required during mode switching is determined by the predetermined angle θ of the cam because the operating member moves at a predetermined speed. However, in the conventional technology described above, this angle θ cannot take a large value close to vertical in order to smoothly operate the mechanical element.
There is a problem in that it takes time to change the mode and it is not possible to prevent the tape from becoming loose.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cam operating mechanism that can eliminate the problems of the prior art described above and shorten the time required for moving mechanical elements during mode switching.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the invention of claim 1 changes the angle of a cam surface with which a mechanical element abuts an operating member that moves in response to an external operating input. It is characterized by being equipped with an operation panel that is rotatably supported.

[0008] The invention according to claim 4 provides first and second operating members having cam surfaces with different slopes, means for moving the operating members at mutually different speeds, and means that engages with the cam surfaces. It is characterized by comprising a moving mechanical element.

[0009]

[Operation] According to the invention of claim 1, when the operating member moves in one predetermined direction, the mechanical element moves while being pressed against the cam surface, so that the angle can be changed, and the mechanical element moves in one direction. 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 mechanical element instantly moves on the cam surface. Therefore, it has become possible to shorten the moving time of the mechanical elements when switching modes of the magnetic recording/reproducing device. According to the invention of claim 2, the moving speeds of the first and second operating members are made different, and the mechanical element is moved from the first position to the second position.
By switching the operation member to be engaged with the mechanical element when moving it to the first position and when moving it from the second position to the first position, the mechanical element can be changed when switching modes of the magnetic recording/reproducing device. It has become possible to shorten travel time.

0010

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are configuration diagrams of the main parts of a magnetic recording and reproducing apparatus using the present invention. FIG. 1 is a diagram seen from the front, and FIGS. 2 and 3 are diagrams seen from the back. be.

In FIG. 1, 1a is a main chassis;
b is a sub-chassis, 2 is a cylinder, 3 is a loading motor, 4 is an inlet tape pull-out member, 5 is an outlet tape pull-out member, and 61 and 62 are loading arms. Further, 6 is a supply side reel stand, 7 is a take-up side reel stand, 8 is a tension arm, 9 is a capstan, 10 is a pinch roller, 1
3a, 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, 44, 45,
46 is idler gear, 47 is inhibit arm, 48
is an idler arm, and 50 is a tension band. In FIG. 2, 20, 21, 22, 23, 24 are reduction gears, 25 is a cam gear, 26 is a cam groove, 27 is a fan gear, and 28
is a drive gear, 30 is a mode gear, 31 is a reduction gear, 10
0 is an operating member, 33 is an operating lever, 35 is a brake operating 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 explained. In FIG. 1, the entry side loading gear 16a is operated by the loading motor 3 to reduce the gears 20, 21, 22, 23.
, 24, cam gear 25, fan gear 27, and drive gear 2
8, the output side loading gear 16b
is driven by obtaining driving force from the entry side loading gear 16a. Inlet and outlet loading gears 16a, 16b
When is driven, the inlet tape pull-out member 4 and the outlet tape pull-out member 5 connected to the loading arms 61, 62 attached to the loading gears 16a, 16b are driven. Note that the drive gear 28 has two stages, and a gear (not shown) and the fan gear 27 mesh with each other. Further, the driving force transmitted from the cam gear 25 to the mode gear 30 via a switching mechanism described later is transferred to the reduction gear 31 and the operating member 1.
The operating member 100 is operated by the rack 100c provided at the
transmitted to. As a result, the operating member 100 is driven. The upper cam portion of the operating member 100 includes a brake operating lever 35 that is biased counterclockwise with the shaft 35a as a fulcrum.
The second member 35b of the lever 35 is engaged with the second member 35b of the lever 35.
The driving members 13 of the main brakes 13a and 13b are interlocked with each other. On the other hand, the drive members of the supply side sub-brake 14a and the winding side sub-brake 14b are engaged with the lower cam portion of the operating member 100. As a result, the movement of the operating member 100 causes these mechanical elements to press against and separate from the reel stands 6 and 7 on both the supply and take-up sides.

The idler gear 44 in FIG. 1 is driven by a belt 43 from a pulley 41 engaged with a capstan motor 40, an idler pulley 42, and a gear (not shown) coaxial with the idler pulley 42. be done. The idler gear 45 obtains a driving force from the idler gear 44 and transmits the driving force to the supply side reel stand 6, or the idler gear 46 transmits the driving force to the take-up side reel stand 7 according to the left-right movement of the idler arm 48. Further, the idler arm 48 is provided with a rising portion 48b, which comes into contact with the inhibit arm 47 engaged with the take-up side sub-brake 14b, so that the take-up side reel stand 7 The idler gear 46 is configured to operate so as not to engage with the idler gear 46. Further, a driving force is transmitted to the pinch roller 10 via a loading gear 16b and driving gears 90 and 91.

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

In FIG. 4, a plate 101 different from the operating member is mounted on the operating member 100 so as to be freely rotatable about a pin 102 erected on the operating member 100. Stoppers 103 and 104 are fixed to the operating member 100 and prevent the plate 101 from rotating too much around the pin 102. 105 is the operating member 1
This is a spring that biases the plate 101 and the plate 101.

According to the cam operating mechanism configured as described above, the plate 1
When the operating 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 101 is connected to the plate 10 as shown in FIG.
It instantly moves to the cam surface 100b of No. 1. As a result, it becomes possible to shorten the moving time of the mechanical element 35 when switching modes.

On the other hand, when the operating member 100 is moved in the direction of the arrow H, since the plate 101 is pressed against the mechanical element 35, the plate 101 changes the angle of the cam surface with respect to the operating member 100, as shown in FIG. change. As a result, the mechanical element 35
can move smoothly on the cam surface of the plate 101.

Although the operating member 100 is linear in this embodiment, it may be an arc-shaped or annular operating member.

When this embodiment having the above configuration is applied to a magnetic recording/reproducing apparatus, it becomes possible to shorten the TR time in the mode transition TR of the magnetic recording/reproducing apparatus shown in Table 1. For example, the operation from FF/REW to LSTOP (loading stop) 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. In FIG. 7, 110 and 120 are first and second operating members having different cam surfaces, 35 is a mechanical element, and 1
30, 140 are motors, 131, 132, 133, 14
1, 142, 143 are reduction gears. In addition, in FIGS. 8, 9, and 10, 110a, 110b, and 110c are cam surfaces of the first operating member 110, and 120a, 120b,
120c is a cam surface of the second operating member 120;
The operating member 110 has a cam surface 110b with a gentle slope.
, the second operating member 120 has a cam surface 12 with a steep slope.
It has 0b. Further, in the drawing, the two operating members are not necessarily drawn to overlap for the sake of explanation, but they are originally meant to overlap.

In FIG. 7, the first operating member 110 is
By the motor 130, reduction gears 131, 132, 133
, is decelerated and driven via the rack portion 110d of the operating member 110. Similarly, the second operating member 120 is driven to reduce speed by the motor 140 via the reduction gears 141, 142, 143 and the rack portion 120d of the operating member 120.

As shown in FIG. 8, the mechanical element 35 determines the reduction ratio of the motors 130 and 140 (not shown) so that the mechanism element 35 moves while simultaneously contacting the cam surfaces 110b and 120b of the operating member. . First and second operating members 110,1
20 in the J direction, by moving the first operating member 110 faster than the operating member 120, the cam surfaces 110c, 12 go through the state shown in FIG.
It is possible to bring the mechanical element 35 into contact with 0c. On the other hand, when moving the first and second operating members 110 and 120 in the I direction, similarly, by moving the first operating member 110 faster than the second operating member 120, the state shown in FIG. The state shown in FIG. 8 can be achieved through the state shown in FIG. At this time, the mechanical element 35 has the cam surfaces 110c, 1
20c to the cam surfaces 110a and 120a instantly.

Note that the number of operating members that come into contact with the mechanical element 35 may be only one instead of two at the same time.

Next, FIGS. 11, 12 and 13 show a modification of the second embodiment in which the cam inclined surface of one operating member is made at right angles.

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. 11,
Cam surface 160 provided on the side surface of second operating member 160
The end of the mechanical element 35 that is in contact with the cam surface 160c
The second operating member 160
As shown in FIG. 12, the mechanical element 35 moves in the direction of arrow I, causing the mechanical element 35 to move against the cam surfaces 150a of the first and second operating members.
, 160a, and mechanical element 3 at the time of mode switching.
It becomes possible to shorten the travel time of 5. When switching to the previous mode (FIG. 11) again, the mode switching time is shortened by moving the first operating member 150 at high speed in the J direction, and the mechanical element 35 is moved to the cam surface 15 of the first operating member 150.
0c first. After that, in order to bring the mechanical element 35 into contact with the cam surface 160c of the second operating member 160,
Move the second operating member 160 in the J direction (see FIG. 13). In addition, the first operating member 150 moves in the I direction and waits for the next high-speed mode switching (FIG. 11).
. Note that in this embodiment, the first and second operating members 150, 1
Although two motors are used to move the motor 60, a single motor with a switching mechanism may be used instead.

[0026] Also, the operating members 110, 120, 150,
Although 160 is a straight line, it may be an arcuate or annular operating member.

Furthermore, in the first and second embodiments, the present invention was explained as an example in which the present invention was applied to a mechanical element that drives a main brake, but the present invention is not limited to this, and is applicable to a sub-brake or a driving mode switching device. The present invention can also be applied to mechanical elements used for attaching and detaching members such as pinch rollers to and from capstans.

Next, each mode of the magnetic recording/reproducing apparatus equipped with the present invention will be explained with reference mainly to FIGS. 1 and 2.

In the stopped state, the main brakes 13a, 13b, the supply side sub-brake 14a, and the take-up side sub-brake 14 are applied to both the reel stands 6, 7 on the supply side and take-up side.
b is pressed. After loading 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 20,
Cam gear 25 starts rotating via 21, 22, 23, and 24. The mode gear 30 rotates due to the rotation of the cam gear 25, the operating member 100 moves in the H direction in FIG. 4, and only the main brakes 13a and 13b are released. The supply side sub-brake 14a and the take-up side sub-brake 14b remain pressed against both the reel stands 6, 7 on the supply side and take-up side.

As the rotation of the cam gear 25 further progresses, the loading mode is entered, and the cam gear 25
The fan gear 27 engaged with the cam groove 26 provided in
1 and 62, the inlet tape drawer member 4 and the outlet tape drawer member 5 are moved, and the magnetic tape is drawn out from the tape cassette 15 and wound around the drawer cylinder 2.

[0031] After that, the operator fast forwards/rewinds (FF/
When the REW) mode is selected, the pressure on the take-up sub-brake 14b of the take-up reel stand 7 is released, and fast forwarding or rewinding proceeds. The operator activates the STOP mode at an appropriate time.
When the mode is selected, for example, the operating member 100 moves in the direction F in FIG.
Press both reel stands on the take-up side to stop the magnetic tape. At this time, due to the cam operation mechanism of this embodiment, the main brakes 13a and 13b momentarily press both the reel stands on the supply side and the winding side, and the brakes are applied to both the reel stands instantly. As a result, loosening of the magnetic tape at the time of STOP mode transition can be sufficiently prevented, and
The take-up side sub-brake 14b again presses against the take-up side reel stand 7. During this fast forward/rewind operation, the pinch roller
The supply side sub-brake 14a remains in pressure contact, and the tension arm 8 remains in a regulated state.

Next, when the recording/playback mode is operated,
Supply side sub-brake of both reel stands 6, 7 on supply side and take-up side
The pressure contact between the key 14a and the take-up side sub-brake 14b is released, and the tension arm 8 is released from its restriction, so that the tension pin erected on the tension arm 8 is moved from the magnetic tape.
The pinch roller 10 comes into pressure contact with the capstan 9 to pinch the magnetic tape, and at the same time engages the idler gear 46 with the take-up reel stand 7 to wind up the magnetic tape. Enters recording/playback mode.

[0033] Also, in the search mode, in the case of forward rotation, the mode
Capstan 9 is the same as the recording/playback mode.
rotates at high speed.

In the reverse search mode, the loading mode
When the motor 3 rotates in the loading direction, the lower cam portion provided on the operating member 100 presses the take-up sub-brake 14b against the take-up reel stand 7. Also, take-up side sub-brake 1
4b rotates the inhibit arm 47, and the idler arm 48 is separated from the take-up reel stand 7. The other mechanical elements are controlled by a cam provided on the operating member 100, and the pinch roller is controlled not to operate by a cam groove 26 provided in the cam gear 25. Then, due to the reverse rotation of the capstan motor, the magnetic tape held between the capstan 9 and the pinch roller 10 is fed out in the reverse direction, and the idler 45 is moved to the supply lead.
The magnetic tape is engaged with the reel stand 6, the magnetic tape is wound onto the supply reel in the tape cassette, and a reverse search is performed. Above, we have explained the operation of the mechanical elements in each mode when the modes progress in the order in which the loading motor 3 rotates in the loading direction, but the same applies when the modes progress in the opposite direction. Perform the following actions.

Next, the switching mechanism of the drive gear will be explained. FIG. 14 is an exploded view showing the structure of the cam gear 25, fan gear 27, and mode gear 30 that constitute the drive gear. The cam gear 25 engages with the reduction gear 24, and the fan gear 2
The gear part 70 has a cam groove 26 for driving the mode gear 30, the side cam part 71 controls the rotation of the mode gear 30, and the gear part 72 engages with the mode gear 30 and transmits the driving force. There is. Next, the fan gear 27 is connected to the cam groove 2 of the cam gear 25.
A pin 74 set up on the fan gear 27 engages with the cam gear 6, and as the cam gear 25 rotates, it rotates about a shaft 73 set up on the chassis 1a. Further, the mode gear 30 is made up of a gear portion 75 that engages with the gear portion 72 of the cam gear 25 and transmits driving force from the reduction gear 24, and a side cam portion 76 that engages with the side cam portion 71.

Next, using FIGS. 15, 16, and 17, an explanation will be given of 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 operating mechanism side. do. After installing tape cassette 15,
The cam gear 25 in FIG. 15 rotates in the direction of arrow A by an angle θ1, and as shown in FIG. A driving force is transmitted to the operating member 100 through the drive member 100 to operate the mode operating 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.

The range of the next angle θ2 is the range of the fan gear 27 along the cam groove 26 of the cam gear 25 during the loading section.
rotates. During this time, as shown in FIG.
The 0 gear portion 75 engages with the notch side of the gear portion 72 of the cam gear 25, and the convex side of the side cam portion 71 of the cam gear 25 and the notch side of the side cam portion 76 of the mode gear 30 engage. The rotation of the matching mode gear 30 is stopped.

After the loading is completed, mode operation is performed within the next range of angle θ3. fan gear 27
Even after the loading is completed, the pinch roller 10 is rotated to press the capstan 9 against the capstan 9 in order to run the magnetic tape. The mode gear 30 re-engages with the gear portion 72 of the cam gear 25 and transmits the driving force to the operating member 100.
The mechanical elements are operated according to each mode.

[0039]

Effects of the Invention As is clear from the above explanation, the cam operating mechanism of the present invention reduces the time required during mode switching and enables high-speed movement of mechanical elements.
For example, it becomes possible to instantaneously perform a brake operation on a magnetic recording/reproducing device. As a result, it is effective in preventing tape slack, for example. In addition, the cam surface that can form different angles can be constructed with a simple structure, and costs can be reduced.

[Brief explanation of drawings]

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

FIG. 2 is a back view of FIG. 1;

FIG. 3 is a schematic diagram of operating members, mode gears, reduction gears, and mechanical elements of the magnetic recording and reproducing device.

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

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

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

FIG. 7 is a schematic diagram of operating members, a motor, a reduction gear, and mechanical elements of the magnetic recording and reproducing device.

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

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

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

FIG. 11 is a diagram showing a modification of the cam operating mechanism of the second embodiment.

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

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

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

FIG. 15 is an enlarged plan view of the 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 diagram of a driving force switching mechanism for a cam gear and a mode gear.

[Explanation of symbols]

100, 110... Operating member, 100a, 100b, 110a, 110b... Cam surface of operating member, 100c, 100d... Rack portion of operating member, 100d...
Guide portion of operating member 100, 101... member, 101a, 101b, 110c... cam surface of member 101,
102...pin, 103,104...stopper, 105...spring,

Claims (5)

[Claims] [Claim 1] A cylinder (2) equipped with a rotating magnetic head.
and a chassis part (1a, 1) that holds the cylinder (2).
b) and a cam surface (100a, 1
an operating member (100) having an operating member (00b);
A magnetic recording and reproducing device comprising a mechanical element (35) that engages with the cam surface of the operating member (100) and operates a member that operates the braking force of the reel stand and a member that switches the running mode, the operating member (100) An operation plate (10
1), the operation plate (101) has two different cam surfaces (101a, 101b), and when the operation plate (101) is in the first position, the cam surfaces (101a, 101
b) forms a cam surface having a predetermined first angle with respect to the operating member (100), and when the operating plate (101) is in the second position, the cam surface (101a, 101b) at a different second angle with respect to the operating member (100) (but
By forming a cam surface having an angle (first angle>second angle), the movement time of the mechanical element (35) is shortened by using the cam surface having the first angle. cam operation mechanism for magnetic recording and reproducing devices. 2. The cam operating mechanism for a magnetic recording/reproducing apparatus according to claim 1, wherein the operating plate (101) is biased to the first position. 3. The operation member (100) includes an operation plate (100).
3. The cam for a magnetic recording and reproducing apparatus according to claim 1, further comprising a stopper (103, 104) for holding the cam at the first position or the second position. Operation mechanism. [Claim 4] Cylinder (2) equipped with a rotating magnetic head
and a chassis part (1a, 1) that holds the cylinder (2).
b) and a first operating member (11) which is movably attached to the chassis and moves in response to an external operating input.
0), a second operating member (120), and a member that engages with the cam surface of the first operating member (110) to operate a member that operates the brake force of the reel stand and a member that switches the running mode. A magnetic recording and reproducing device 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 slope of the first cam surface<the slope of the second cam surface), and moves the mechanical element (35) from the first position to the second position. moving the first operating member faster than the second operating member such that the second cam surface is used when moving the first operating member, and the first cam surface is used when moving from the second position to the first position; Mechanism element (35) by enabling
A cam operating mechanism for a magnetic recording/reproducing device, characterized in that the cam operation mechanism is configured to reduce a moving speed from the first position to the second position. 5. The first and second operating members (110, 12
5. The cam operating mechanism for a magnetic recording/reproducing apparatus according to claim 4, wherein racks (110d, 120d) are formed on each side surface of the magnetic recording/reproducing apparatus.