JPH0461420B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording and reproducing device such as a video tape recorder (VTR) that uses tape as a recording medium, and particularly to a device that can be made smaller, thinner, lighter, and more compact. The present invention relates to a mode operating mechanism and a tape loading mechanism of a recording/reproducing device suitable for reducing the number of parts and improving assembly workability.

[Background of the invention]

The mode operation mechanism and tape loading mechanism of current recording and reproducing devices are, for example,
As described in Publication No. 114154, a relatively small-diameter, disk-shaped operating cam body supported by a central shaft and having a cam groove in its surface is used, and a gear is formed on the outer periphery of the operating cam body. , the power from the drive source is transmitted to this small disc-shaped operating cam body, which rotates and drives the loading member and mode operating member engaged in the cam groove. The mainstream method is to transmit driving force through a path including a mode operation and loading cam, an operation conversion member, and an operated member to perform mode operation and loading operation.

However, according to this conventional technology, a large number of converting members (for example, arms, sliders) having a complicated structure are inserted between one small disc-shaped operating cam body and a plurality of operated members. Therefore, there are drawbacks such as a complicated mechanism, an increase in the area and volume occupied, an increase in weight, an increase in the number of parts, and a decrease in assembly workability.

[Purpose of the invention]

An object of the present invention is to eliminate the drawbacks of the prior art described above, and to realize a recording/reproducing device that is small, lightweight, and thin, and has excellent assembly workability.
The purpose of the present invention is to provide a mechanism that has a simple configuration and can reliably perform tape loading operations and mode operations.

[Summary of the invention]

The present invention relates to a recording and reproducing apparatus such as a video tape recorder that records or reproduces signals on a tape with a head, which is connected to an output stage from a motor and has an arcuate portion concentric with the rotation center, and the rotation center side is connected to an output stage from a motor. a rotating member for driving that is air-centered; a loading member provided separately from the rotating member for driving; and a member for loading disposed between the loading member and the rotating member for driving, the rotating member for driving; On the other hand, the output stage from the motor has a driving force transmission member including a rotating member arranged at a predetermined angle with respect to the rotation center, and an arc-shaped portion in which a cam structure is formed along the longitudinal direction. an operating cam body that is concentrically connected to the driving rotating body and capable of reciprocating in an arcuate manner integrally with the driving rotating body; and an operating cam body that is engaged with the cam structure of the operating cam body and controls the mode of the device a mode operating member for switching, and the driving force is configured such that the driving rotary body and the loading member have a section in which transmission of the rotational driving force from the driving rotary body to the loading member is cut off. They are connected via a transmission member.

With this new configuration, the entire device can be made smaller, lighter, thinner, simpler in structure, and easier to assemble, mainly by simplifying the mode operating mechanism and the loading drive force transmission mechanism.

[Embodiments of the invention]

Embodiments of the present invention in which the present invention is applied to a magnetic recording/reproducing apparatus such as a video tape recorder will be described below with reference to FIGS. 1 to 14.

In addition, in this example, the following aspects are used as each component of the invention. That is, (1) Operation cam body: formed in an arc shape on the circumference of the annular operation ring 64. The uneven cam structure is formed on the peripheral surface of the arc-shaped operating cam body 64a.

(2) Driving rotating body...output stage 66 from motor 65
The drive ring 27 is configured as a drive ring 27 connected to the drive ring 27 . The drive ring 27 surrounds the rotary drum device 2 as a rotary head device and is arranged around it. Further, the drive ring 27 has approximately the same outer diameter as the operating cam body 64a, is arranged concentrically therewith at a small distance in the axial direction, and is coupled to the operating cam body 64a. is,
A rotational driving force in the tangential direction of the arc is applied to the operating cam body 64a. Further, on the inner peripheral side surface of the drive ring 27, a gear structure (first drive gear 200) as a first rotational driving force transmission structure and a first rotational position are provided in the direction of the rotation center axis of the drive ring 27. A flat surface structure (holding surface 201) having a predetermined height is formed as a holding structure. A driving force transmitting member and a rotating member (transmission gear 31) are connected to the first rotational driving force transmitting structure and the rotational position holding structure. This connection structure extracts a driving force for operating the loading ring 6 as a loading member, and also maintains the position of the loading member upon completion of the loading operation. In this embodiment, the driving ring 27 and the operating cam body 64a are coupled to each other by a pin 71 as a first cam engaging portion fixed on the plane of the driving ring 27 and a pin 71 fixed on the plane of the operating cam body 64a. Above pin 7
This is achieved by engagement with an elongated hole (groove 64') serving as a second cam engagement portion provided at a radial position corresponding to 1.

(3) Mode operation member...Disposed in a plane along the locus of the reciprocating circular arc movement of the operation cam body 64a, and attached to the cam structure of the operation cam body 64a with arms and pins (18-a, 19-a, 20 -a, 25-a,
58-a). In this embodiment, the mode operating member includes a tape drive member comprising a pinch roller 57 for driving the tape to travel and a peripheral member, and a tape drive member that selectively engages with one of the two reels and operates the same. A reel drive member consisting of an idler gear 24, an idler arm 25, and peripheral members thereof for rotational driving;
and a reel braking member configured to select one of the reels and apply a braking force to the braking member. These three types of mode operations are provided inside the outer circle of the operating cam body 64a and the drive ring 27 concentric therewith.

(4) Loading member...the above operation cam body 64a
It is provided as an independent structure separate from the drive ring 27 around the rotary drum device 2 as a rotary head device and inside the drive ring 27. An annular loading ring 6 including the rotating drum device 2 therein; and this loading ring 6.
It includes guide rollers 8 and 9 attached thereto. The loading ring 6 is rotated around a fixed center point by the rotational driving force of the driving ring 27 being transmitted through a driving force transmitting member having a gear structure. Guide rollers 8 and 9 on the loading ring 6 are brought into contact with the tape and moved together with the loading ring 6 to pull out the tape from the reel and wrap it around the outer peripheral surface of the rotating drum device 2 as a rotating head device. It is configured to be released from the outer peripheral surface.

(5) Driving force transmission member: has a rotational axis parallel to the rotational center axis of the drive ring 27 of the output stage in the drive means, has a rotational driving force transmission structure part and a rotational position holding structure part, and has a rotational driving force transmission structure part and a rotational position holding structure part. In the example, in particular, the rotational driving force transmission structure and the rotational position holding structure are connected to two rotating members (all-round gear 31
A, toothless gear 31B).
Of these two rotating members, one is a so-called full-circumference gear 31A in which a plurality of tooth profiles 210 are formed at equal intervals over the entire outer circumference, and the other is a so-called full-circumference gear 31A with one tooth profile formed on its outer circumference. tooth profile 211
This is a so-called partially toothed gear 31B. The full-circumference gear 31A is engaged with or disengaged from the drive ring 27 and the first rotational drive force transmission structure on the inner periphery as a second rotational drive force transmission structure, and The partially toothed gear 31B is released or engaged with the first rotational position holding structure on the inner periphery of the drive ring 27 as a second rotational position holding structure. That is, the full circumferential gear 31A serving as the second rotational driving force transmission structure is connected to the drive ring 2.
7, the full-circumference gear 31A and the partially toothed gear 31B rotate by a predetermined angle in response to the rotational driving force of the drive ring 27. In the state where the engagement is released, the rotational movement is stopped, and on the other hand, in this state, one tooth profile 211 of the toothless gear 31B serving as the second rotational position holding structure is connected to the drive ring. It is pressed against the flat surface 201 of the first rotational position holding structure section 27. The all-around gear 31A further includes:
Gear 3 in the next stage loading drive force transmission member
8 (transmission gear) at all times.

In the configuration of this embodiment, the signal and recording or reproducing heads are mounted on the rotating structure of the rotating drum device 2 as a rotating head device.
The tape is wound around the outer peripheral surface of the rotary drum device 2 at a predetermined angle, and is driven to travel by a tape drive member included in the mode operation member. In this embodiment, the rotating drum device 2 is disposed within the annular operation ring 64, that is, within the circumference of the arc-shaped operation cam body 64a. Further, both ends of the tape are wound around two reels 111 and 112 in a cassette.

FIG. 1 is a plan view showing an outline of the arrangement of components on a chassis of a magnetic recording and reproducing apparatus equipped with the mode operating mechanism and loading mechanism of the above embodiment.

A cassette 100 containing two reels 111, 112 and a tape 53 is installed in the magnetic recording/reproducing apparatus of this embodiment, as shown by dotted lines in the figure. On the disc-shaped chassis 1, a cylindrical rotating drum device 2, a capstan 3, a reel stand 4,
5, loading ring 6, pinch roller 57, and other main components are arranged as shown.

The loading ring 6 is rotatably held on the chassis 1 by three hold rollers 10, 11, and 12 that are in sliding contact with the inner circumference thereof, and a tape 53 is placed on the chassis 1 in a cassette 100.
A tape pull-out guide roller 9 for pulling out the tape from the reels 111 and 112 inside, and this tape 53.
Further, an entrance guide roller 8 is provided to wrap the head at a predetermined angle around the outer periphery of the rotating drum device 2 on which the head is mounted. Reel stand 4,5
Shafts 4-a and 5 press-fitted into chassis 1
-a is rotatably supported. Near the outer periphery of the reel stands 4, 5, there are a main brake 18 and sub brakes 19, 2 for braking the reels 111, 112 as reel braking members, which are one of the mode operating members for switching the mechanical state of the device.
0 are rotatably attached to the chassis 1 around respective pins 14, 15, 16, and 17 press-fitted onto the chassis 1.

Moreover, between these reel stands 4 and 5,
Similar to the reel braking member described above, the idler gear 2 is used as a reel driving member which is one of the mode operating members.
4 and a relay gear 26 are mounted on the idler arm 25, which is rotatably held with respect to the shaft 25-b. The idler gear 24 selectively engages with the reel stand 4 or the reel stand 5 according to the mode operation, and transmits the rotational force of the capstan motor 80 to the reel stand 4 or the reel stand 5. On the outer periphery of the reel stand 5 on the supply side, one end is connected to a chassis 1.
Band brake 2 engaged and fixed to upper pin 35
2 is wound around a predetermined angle, and the other end of the band brake 22 is rotatably engaged with a pin 21 on a tension arm 23. The tension arm 23 has a tension pin 95 near the tip that contacts the loading ring 6, and has a structure that rotates around a fulcrum 90 provided at the base on the opposite side, and is rotated by the loading operation of the loading ring 6. The tip portion in contact with this rotates in the same direction, and the tension pin 95 is brought into contact with the surface of the tape 53. Due to the rotational movement, the band brake 22 connected to the pin 21 is pulled at its end, tightens the outer periphery of the reel stand 5, and applies braking torque to the reel stand 5 against the running of the tape 53. As a result, the tape 53 is run under a predetermined tension.

FIG. 2 shows a loading ring 6, an arc-shaped drive ring 27 as a part of a drive rotating body, an arc-shaped operation cam body 64a, and
First guide support part 64 of the guide instruction mechanism members
FIG. 7 is a sketch showing the attachment relationship of an annular operation ring 64 that is provided with the same as the FIG. The loading ring 6 is provided with gears over its entire outer periphery, and is arranged on the upper surface of the chassis 1 so as to surround the rotating drum device and have a circular arc portion on the periphery overlap the cassette 100. There is. The drive ring 27 has gear teeth formed on a part of its inner periphery, and is held concentrically with the operation ring 64 in a rotatable state close to the lower surface of the chassis 1. The operation ring 64 is the drive ring 2
7, which is rotatably guided and supported by three holders 37, which are second guide support parts of the guide support mechanism members, with respect to the chassis 1, on the side further away from the chassis 1. There is. The holder 37
is arranged at the inner peripheral edge of the first guide support part 64b in the operation ring 64, and guides and supports the first guide support part 64b. A cam structure is provided on the inner and outer circumferential surfaces of the arc-shaped operating cassette body 64a within the operating ring 64 for operating a plurality of mode operating members that engage therewith. In addition, the operation ring 64 has
A groove 64' is provided over a predetermined length,
Here, the pin 71 implanted on the drive ring 27
is engaged with. In addition to the loading ring, the driving ring 27 and the arc-shaped operating cam body 64a on the operating ring 64 are also arranged under the reels 111 and 112 in the cassette 100, overlapping each other. Further, the driving ring 27 and the operating ring 64 also include the loading ring 6 and the rotating drum device 2 within their circumferences.

FIG. 3 is a plan view of the device structure shown in FIG. 1, viewed from the back side. The outer edge of the chassis 1 is
The drive ring 27 and the operation ring 64 are protected by the cup-shaped structure protruding toward the back surface. A flywheel 28 is press-fitted into the capstan 3, and is also used as a rotor of a concentric direct drive type capstan motor 80 that drives the capstan 3. A driving force is connected to the capstan 3 between a driving pulley 28-a, which is coaxial with the flywheel 28 and press-fitted into the capstan 3, and a relay pulley 29 for transmitting the reel stand driving force to the idler gear 24. A transmission belt 30 is stretched. For the gear portion provided on the inner periphery of the drive ring 27, the transmission gear 31 (31A, 31B)
and the drive gear 66 are engaged with each other. A part of the arc-shaped operation cam body 6 on the circumference of the operation ring 64
The cam structures provided on the inner peripheral surface and the outer peripheral surface of the cam structure 4a have a sub-mode operating member disposed on the chassis 1 along the arcuate movement locus of the arc-shaped operating cam body 64a. Brake 1
9, 20, pinch roller arm 58, main brake 18, etc., and pins 19-a, 20-a, 58- for controlling these to mode operation.
a, 18-a penetrate through the opening of the chassis 1 and are brought into contact with the chassis 1. Above pins 18-a, 19-
a, 20-a, and 58-a also constitute a part of the mode operation member.

FIG. 4 shows a driving motor 65, a driving gear 66 as a part of a driving rotating body, and a driving ring 27.
FIG. 6 is a cross-sectional view showing the positional relationship of an operating ring 64 in which an arc-shaped operating cam body 64a and a guide support mechanism portion 64b are provided. A worm gear 67 is attached to the tip of the drive shaft of the drive motor 65,
It is meshed with one gear part of a drive gear 66 having two gear parts, and the other gear part of the drive gear 66 is meshed with a gear surface on the circumference of the drive ring 27 as an output stage from the motor. has been done.
Therefore, the rotation of the drive motor 65 rotates the drive ring 27 via the drive gear 66.

Figure 5 shows the drive ring 2 as a rotating body for drive.
Transmission gear (a) 31 and transmission gear (b) 38 as rotating members that transmit the driving force of 7 to the loading ring 6
FIG. 4 is a cross-sectional view showing a driving force transmission member composed of a transmission gear (c) and a transmission gear (c) 39; As shown in FIG. 1, the transmission gear (c) 39 is engaged with the loading ring 6 on the upper surface of the chassis 1, and the transmission gear (c) 39 is engaged with the loading ring 6 on the upper surface of the chassis 1. It is fixed at one end with a set screw 42. A transmission gear (b) 38 is press-fitted into the other end of the shaft 41, and includes a transmission gear (c) 39 on the upper surface of the chassis and a transmission gear (b) 3 on the lower surface of the chassis.
8 are rotated in synchronization with each other.

As shown in FIG. 6, the transmission gear (a) 31 is provided with a tooth profile (second drive gear) 210 over the entire circumference and is configured to mesh with the drive ring 27 and the transmission gear (b) 38. The all-round gear 31A has only one tooth profile (holding gear) 211 on its circumference, and the other outer circumferential portion is a cylindrical surface having the same diameter and concentricity as the bottom circle of the all-around gear 31A. Missing tooth type gear 3
1B are gears of a composite structure that are fixed to each other in the axial direction by pins 43 and 44. The transmission gear (a) 31 is rotatably supported by a shaft 46 which is further fixed to a boss 45 press-fitted into the chassis 1. In FIG. 6, one tooth profile (holding gear) 211 of the partially toothed gear 31B located below the shaft 46 in the axial direction is different from the full circumference tooth profile (holding gear) of the upper full circumference gear 31A. The tooth profile of one of the two driving gears 210 and its outline line are configured to overlap and match in the axial direction. In the state of loading operation, the tooth profile (second drive gear) 210 of the full circumference gear 31A and one tooth profile (holding gear) 211 on the circumference of the partially toothed gear 31B are the same as the drive ring 2.
Tooth profile formed on the inner peripheral surface of 7 (first drive gear)
200, and by the rotational driving force of the drive ring 27, the full circumferential gear 31A and the partially toothed gear 31B are rotationally driven around the shaft 46. Second drive gear 2 of full circumference gear 31A
10 is further connected to a transmission gear (b) 38, so that the rotation of the all-round gear 31A rotationally drives a transmission gear (c) 39 coupled thereto.
Since the transmission gear (c) 39 is engaged with a gear portion on the outer periphery of the loading ring 6, the loading ring 6 is also rotationally driven by the rotational drive of the transmission gear (c) 39. By rotating the loading ring 6, the tape 53 is loaded onto the outer periphery of the rotating drum device 2.

When the loading operation is completed and the mode operation is performed, the all-round gear 31
The second drive gear 210 of A is the drive ring 2
7, the retaining gear 211 of the partially toothed gear 31B reaches the flank 202 and is not engaged with the drive ring 27. On the inner circumferential surface of the holder, the holder is brought into contact with the flat holding surface 201, and is slid on the holding surface 201 to maintain a constant posture. The drive ring 27 further rotates by a predetermined angle in the same direction while keeping the holding gear 211 of the toothless gear 31B sliding on the holding surface 201. The second drive gear 210 is located at the flank 202, and the holding gear 2
11 is engaged on the holding surface 201, the drive ring 27 is engaged with the concentrically disposed operating ring 64 due to its rotational movement, causing the operating ring 64 to be interlocked and set to the mode. Drive the operating member.

As shown in FIG. 7, the circular arc-shaped rotational movement of the drive ring 27 in the direction of arrow A is converted into the rotational movement of the loading ring 6 in the direction of arrow B by the above-mentioned transmission mechanism. , the entrance guide roller 8 on the loading ring 6 as shown in FIG.
performs an operation of winding the tape 53 around the entrance side of the rotating drum device 2. Further, the center axis of the tape pull-out guide roller 9 is the loading ring 6.
It is fixed to the upper surface of the rotary drum device 2 and performs a tape drawing operation on the entrance side of the rotating drum device 2.

FIG. 9 is a plan view showing the relationship between the loading ring 6 and the drive system of the pinch roller 57. The rotation of the loading ring 6 in the direction of arrow B is as follows:
This is converted into rotation of the relay gear 61 and the arm operation gear 60 in the direction indicated by the arrow in the figure. The arm operation pin 60-a then presses the torsion spring 59 in the direction of the arrow in the figure. At this time, the torsion spring 5
The elastic force caused by straining 9 is the one end 5 of the torsion spring 59.
9-a to push the guide arm 56 in the direction of the arrow in the figure. Due to this pressure, the guide arm 56
is rotated about the shaft 62, and the exit guide roller 55 and winding pin 63 fixed thereon are rotated in the direction of arrow C until a predetermined stop position where the loading operation is completed. be moved.

56-a is a projection provided on the edge of this guide arm 56, and has a structure in which it contacts a part of the pinch roller arm 58. Guide arm 56
As the pinch roller arm 58 engaged with the protrusion 56-a and the pinch roller 57 rotatably supported on the protrusion 56-a are also rotated in the direction of arrow C. I am made to do so.

By the above operation, the tape 53 is also wound around the exit side of the rotary drum device 2. The movement of the guide rollers 8, 9, 55 is continued until the guide rollers 8, 55 reach the catchers 13, 54 shown in FIGS. 8 and 9, respectively. Pinch roller 57, pinch roller arm 58
The operation pin 58-a is a tape drive member.
The pinch roller arm 58 has an operating pin 58 at the tip.
Since it is engaged with the operating ring 64 at point -a, the rotating operation of the operating ring 64 causes the pinch roller to move deeper in the direction of arrow C and away from the protrusion 56-a, sandwiching the tape 53. 57 to the side of the capstan 3. And vice versa,
In the unloading operation in which the loading state is released, the mode operating members are operated in the reverse order and direction.

FIG. 10 shows the entrance guide roller 8 during movement.
6 is a side view showing the positional relationship with respect to the loading ring 6. FIG. The entrance guide roller 8 passes through an elongated hole 6-a provided in the loading ring 6 with a predetermined distance. A thread is formed at the lower end of the entry guide roller 8, and is engaged with a threaded portion provided in a hole of the boss 48.
The entrance guide roller 8 is fixed to the boss 48 by a set screw 49 provided on the side of the boss 48. Further, a flange is provided below the boss 48, and this has a structure to prevent it from coming off from the elongated hole 6-a. A receiving plate 50 is press-fitted into the outer peripheral surface of the boss 48.

FIG. 13 is a perspective view showing the general shape of the receiving plate 50. A pin 50-a is provided at the rear of the receiving plate 50. This pin 50-a receives a compression spring 51 and is connected to a protrusion on the loading ring 6, as shown in FIG.

FIG. 11 shows a state in which the entrance guide roller 8 in FIG. 10 has been further moved and is pressed against the catcher 13.

FIG. 12 is a perspective view showing the structure of the catcher 13. Catcher 13 has two Vs on the top and bottom.
There is a letter-shaped receiving surface that engages with the cylindrical portion of the boss 48 to position the guide roller 8 on the plane of the chassis 1. Further, a tapered surface having a predetermined angle with respect to the advancing direction of the loading ring 6 is provided below the upper receiving surface of the catcher 13, and engages with a tapered surface provided in front of the receiving plate 50. and then crimped.

In this way, the entrance guide roller 8 is connected to the catcher 1.
3, positioning is performed by displacement by a predetermined amount after contact is started. Further, a tapered surface having a predetermined angle with respect to the advancing direction of the loading ring 6 is provided below the upper receiving surface of the catcher 13, and engages with a tapered surface provided in front of the receiving plate 50. and then crimped.

In this way, the entrance guide roller 8 is connected to the catcher 1.
By compressing the compression spring 51 at a position displaced by a predetermined amount after starting contact with the catcher 3, a predetermined gap is created between the boss portion 48 of the entry guide roller 8 and the V-shaped receiving surface of the catcher 13. crimping force is generated. The structure of this crimping part is as follows:
5 and the catcher 54, the output guide roller 55 is pressed against the catcher 54 by the pressing force due to the elasticity of the torsion spring 59.

The timing at which the two guide rollers 8 and 55 are pressed against the catchers 13 and 54, respectively, is determined by the loading ring 6, the relay gear 61,
By adjusting the phase of engagement of the arm operation gear 60, synchronization can be achieved.

Next, the operation of the drive ring 27 when the guide rollers 8 and 55 are pressed against the catchers 13 and 54 with a predetermined force will be described.

FIG. 14 is a plan view showing the positional relationship between the drive ring 27, the full-circumference gear 31A, and the partially toothed gear 31B at the time when the amount of compression of the compression spring 51 reaches a predetermined amount. Gear part 2 of drive ring 27
At the end of the drive ring 27, a recessed relief surface 202 is provided in the half of the drive ring 27 on the chassis 1 side in the thickness direction. The flank surface 202 is
It is spaced apart from the tooth profile 210 of the all-round gear 31A, so that they do not mesh with each other. Therefore, proceeding further from this meshed state in which only the single holding gear 211 of the partially toothed gear 31B meshes with the last tooth profile of the gear portion 200 on the inner circumferential surface of the drive ring 27, the drive ring 27 When the operating cam body 64a is rotated in the direction of arrow A, the holding surface 20 on the inner circumference of the drive ring 27
1 is a single holding gear 21 of a partially toothed gear 31B.
1 is pushed in by a predetermined amount, the attitude of the partially toothed gear 31B is kept constant at that position. The timing of this pushing operation is such that the above-mentioned guide roller 8
The phase relationship between the tooth profiles of the gears is adjusted so as to be synchronized with the timing at which a predetermined pressing force is generated between the catchers 13 and 55 and the catchers 13 and 54.

As explained above, when the drive ring 27 is in the loading operation, the arrow A in FIG.
The pin 7 fixed on the drive ring 27 is driven by drawing an arcuate trajectory in the direction of
1 also moves in the direction of arrow A inside the groove 64' provided in the operating ring 64. During this time, the operating ring 64 is maintained in a stopped state by the tension of the tension spring 69. When the above-mentioned loading operation is completed, the pin 71 on the drive ring 27 is inserted into the groove 6 of the operation ring 64.
4' and touches the operating ring 64. When the drive ring 27 is rotated further in the direction of arrow A from this loaded state, the operation ring 64 is moved by the pin 71 against the tension of the tension spring 69. , is driven to rotate around a fixed center point while drawing an arcuate trajectory in the direction of arrow A.

In FIG. 3, 68 is a slide switch fixed inside the outer peripheral edge of the chassis 1. The operating portion of this switch is engaged with a pin 72 provided on the operating ring 64, and detects the rotation angle of the operating ring 64, a portion of which forms an operating cam body, to detect its operating mode. The cam structures provided independently on the inner and outer circumferential surfaces of the operating cam body 64a on the circumference of the operating ring 64 also respond to the movement of the drive ring 27 described above. It is rotated in an arc around a fixed center point via a groove 64' as a drive means formed in a part. Therefore, each operation pin 18-a, 19- of the main brake 18, sub brake 19, 20, pinch roller arm 58, idler arm 25, which this cam structure is in contact with, respectively.
a, 20-a, 58-a, and 25-a are pressed to move and displace each one to a state corresponding to the operation mode detected by the slide switch 68. Further, in accordance with the operation mode detected by the slide switch 68, the rotary drum device 2 and the capstan 3 are also selectively rotated, and operations in modes such as recording/reproducing, fast forward/rewind, etc. are also performed.

〔Effect of the invention〕

As described above, according to the present invention, a plurality of mode operation members are distributed in a plane along the locus of the reciprocating circular motion of the arc-shaped operation cam body, and the cam of the operation cam body Against the surface,
Since these are configured to be directly engaged, the mode operation mechanism and the operation cam body can be placed adjacent to each other, etc.
Both can be located very close to each other. Therefore, connecting parts such as long arms and complicated sliders are not required, and the cam structure itself is simplified. Furthermore, the number of component parts, mainly the connecting part, is significantly reduced. The operation of each mode operation member is also performed reliably without any time delay or malfunction relative to the operation of the operation cam body. Therefore, it is possible to simplify the structure of the mechanism including the operation cam body, a plurality of mode operation members engaged with the operation cam body, and members surrounding these members.
Improvements such as higher reliability, smaller size, lighter weight, thinner shape, and improved assembly workability can be easily achieved.

Since the loading member such as the loading ring is provided as a separate body independent of the operating cam body, the arrangement and structure of the operating cam body and the mode operating member can be selected and designed with a high degree of freedom within the device.

[Brief explanation of drawings]

FIG. 1 is a top plan view of a magnetic recording/reproducing device as an embodiment of the present invention, FIG. 2 is a sketch showing the positional relationship between the chassis, loading ring, drive ring, and operating ring. A plan view of the chassis seen from the back side, Fig. 4 is a sectional view showing the attachment relationship of the drive motor to the chassis, Fig. 5 is a sectional view of the driving force transmission member, and Fig. 6 is a rotating member of the driving force transmission member. FIG. 7 is a plan view showing the positional relationship between the drive ring and the rotating member of the driving force transmitting member in a rotationally driven state; FIG. 8 is a plan view of the tape loading operation by the loading member; Figure 9 is a plan view of the area around the pinch roller arm, Figures 10 and 11 are side views of the guide roller, Figure 12 is a perspective view of the catcher, Figure 13 is a perspective view of the receiving plate, and Figure 14 is rotation. FIG. 7 is a plan view showing the engaged state of the drive ring and the driving force transmission member just before shifting to the position holding state. 1... Chassis, 2... Rotating drum device, 3...
... Capstan, 4, 5 ... Reel stand, 8 ... Entry side guide roller, 9 ... Tape pull-out guide roller, 18 ... Main brake, 19, 20 ...
Sub brake, 27... Drive ring, 31A...
Full-circumference gear, 31B... Toothless gear, 37... Holder, 38, 39... Loading drive force transmission gear, 53... Tape, 55... Exit guide roller, 57... Pinch roller, 64... ...Operating ring, 64a... Operating cam body, 64b... First guide support section, 65... Drive motor, 100... Cassette, 111, 112... Reel, 200...
First driving gear, 201... Holding surface, 202...
Flank surface, 210...Second drive gear, 211...
Retaining gear.

Claims (1)

[Scope of Claims] 1. In a recording and reproducing device in which a tape is loaded onto a rotary head device having a chassis and signals are recorded or reproduced, an arc-shaped portion connected to an output stage from a motor and concentric with the center of rotation is provided. a driving rotating body whose rotation center side is air-centered; a loading member provided separately from the driving rotating body; disposed between the loading member and the driving rotating body; The output stage from the motor for the driving rotating body includes a driving force transmission member including a rotating member arranged at a predetermined angle with respect to the rotation center, and a cam structure formed along the longitudinal direction. an operating cam body having an arcuate portion, concentrically connected to the drive rotor and capable of reciprocating in an arc integral with the drive rotor; and an operating cam body that is engaged with a cam structure of the operation cam body. , a mode operating member for switching the mode of the device, and the driving rotor and the loading member have a section where transmission of rotational driving force from the driving rotor to the loading member is cut off. A recording/reproducing device characterized in that the device is connected via the driving force transmission member as described above. 2. The recording and reproducing device according to claim 1, wherein the operating cam body is configured to include the rotary head device, the mode operating member, and the loading member within an extension circle of its arcuate portion. Device. 3. The recording/reproducing device according to claim 1 or 2, wherein the chassis has a circular or approximately circular outer shape.