JP2796654B2 - 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 magnetic recording / reproducing apparatus having a rotating magnetic head drum, and more particularly to a loading mechanism.

[0002]

2. Description of the Related Art FIG. 27 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining a driving system of a conventional master cam gear. FIG. 28 is a block diagram of a power transmission mechanism of a driving system of a conventional master cam gear. Referring to FIGS. 27 and 28, magnetic tape 1 is built in cassette 3. The state in which the magnetic tape is loaded is indicated by 2.

[0003] The loading block 5 is fixed to the main chassis 4. The loading block 5 has a loading motor 6 built therein. A small pulley 7 is fixed to a shaft of the loading motor 6. A large pulley 9 rotatably supported by a shaft 8 supported by the loading block 5 is formed integrally with the worm 10. A rubber belt 11 is hung between the small pulley 7 and the large pulley 9.

[0004] A worm wheel 14 integrally formed with a small gear 13 is rotatably supported by a shaft 12 supported by the loading block 5. The shaft 15 fixed to the main chassis 4 causes the master cam gear 16
Are rotatably supported, and the master cam gear 16 and the small gear 13 mesh with each other.

That is, the forward / reverse rotation of the loading motor 6 causes the master cam gear 16 to rotate forward / reverse. A mechanical positive switch (not shown) (a switch for detecting the position of the mechanism, that is, each mode of each mechanism, that is, the rotational position of the master cam gear 16) rotates in accordance with the rotation of the master cam gear 16, and each operation of the mechanism. The type of operation mode can be determined based on the electric output according to the mode.

The lower drum 17 is fixed to the main chassis 4 via a drum base 20. An upper rotating drum 18 having a magnetic head (not shown) is fixed to a shaft 19 supported by a lower drum 17 via a pair of ball bearings (not shown). That is, the lower drum 17
And the rotating drum 18 are provided coaxially. Also,
The shaft 19 is configured to be rotated by a drum motor (not shown), that is, the rotating upper drum 18 is rotated by the drum motor. The rotating magnetic head drum (drum unit) 21 is provided to be inclined leftward.

FIG. 29 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining the operation of a conventional pole base. FIG. 30 is a block diagram of a conventional pole-based driving mechanism. 29 and 30, Su side / Tu side guide rollers 22, 23, Su side / Tu side inclined pole 2
Su, which supports the Su and Tu sides of 4 and 25 in pairs, respectively.
The side pole base 26 and the Tu side pole base 27 are connected to the Su loading rail 2 fixed to the main chassis 4.
8. It is movable by being guided by the Tu loading rail 29, respectively. The relay gear drive lever 30 is rotatably supported by a shaft 31 erected downward on the main chassis 4, and swings to a position indicated by 30 'by rotation of the master cam gear 16, that is, rotation of a cam groove (not shown).

The main chassis 4 has shafts 32, 3
3 and 34, the loading relay gear 35 is driven by the shaft 32, and the Su loading gear 3 is driven by the shaft 33.
The Tu loading gear 37 is rotatably supported by a shaft 34. Loading relay gear 3
5, the Tu loading gear 37 and the Su loading gear 36 are continuously meshed.

A shaft 38 erected on the relay gear drive lever 30 is fitted into a guide groove 39 provided on the loading relay gear 35. When the relay gear drive lever 30 swings, the loading relay gear 35 is rotated. Rotates forward and backward.
When the relay gear drive lever 30 rotates from the position indicated by 30 to the position indicated by 30 ', the Su loading gear 36 rotates clockwise and the Tu loading gear 37 rotates counterclockwise.

Each of the Su loading arm 40 and the Tu loading arm 41 is a chain composed of two links, and one end of each link is connected via a Su loading gear 36, a Tu loading gear 37 and a tension spring (not shown). It is rotatably supported coaxially. S
u loading arm 40, Tu loading arm 4
The ends of the other link 1 are rotatably supported on the Su-side pole base 26 and the Tu-side pole base 27, respectively.

When the Su loading gear 36 and the Tu loading gear 37 rotate clockwise and counterclockwise, respectively, the Su-side pole base 26 and the Tu-side pole base 27 are rotated.
Are guided by a Su loading rail 28 and a Tu loading rail 29, respectively.
Then, predetermined positions are crimped on the SuV block 42 and the TuV block 43 formed on the drum base 20, respectively, and the state indicated by 26 'and 27' is reached.

FIG. 31 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining the operation of the conventional tension lever. FIG. 32 is a block diagram of a conventional tension lever driving mechanism. Referring to FIGS. 31 and 32, a shaft 44 is erected on the main chassis 4 and the tension post 4
The tension lever 46 having the upright 5 is rotatably supported by a shaft 44. A tension spring 47 is hooked on the tension lever 46, and the tension lever 46 is urged counterclockwise.

However, when the Su-side pole base 26 is in the unloading state, the tension lever 46 is in contact with the Su-side pole base 26 and is at a position indicated by 46 in FIG. When the Su-side pole base 26 starts to be loaded, there is nothing to prevent the rotation, and the tension lever 46 rotates to the position indicated by 46 'by the urging force.

FIG. 33 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining the operation of the conventional half load shaft.
FIG. 34 is a block diagram of a conventional half-load shaft driving mechanism. Referring to FIGS. 33 and 34, main chassis 4
A fixed guide 48 is provided upright, and a half load lever 50 on which a half load shaft 49 is provided is rotatably supported coaxially with the fixed guide 48. Half load lever 50 is half load lever spring 5
1 and is in a standby state at a position shown in FIG. 33 in contact with a locking portion 52 provided on the main chassis 4.

The half-load double-acting lever 53 and the half-load drive lever 54 are connected to a shaft 5 erected on the main chassis 4.
The half-load double-acting lever 53 and the half-load driving lever 54 are connected via a half-load double-acting spring 56. The half load double acting lever 53 rotates and swings with the rotation of the master cam gear 16.

The half-load drive lever 54 has a notch 57
The shaft 58 erected downward on the half load lever 50 is fitted with the notch 57.

That is, when the half load double acting lever 53 rotates counterclockwise, the half load driving lever 54
Also rotates counterclockwise, the half load lever 50 rotates clockwise, the magnetic tape 1 is pulled out by the half load shaft 49, and is fixed to the main chassis 4 via the A / C head position adjusting mechanism 59. The A / C head 60 is configured to be wound at a predetermined angle. The half load lever 50 pulls out the magnetic tape 1 in a state where neither the Su-side pole base 26, the tension lever 46, nor the Tu-side pole base 27 is loaded, because the control signal without loading the magnetic tape 1 in the FF or REW mode. In order to read out.

FIG. 35 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining a driving system of a conventional pinch roller.
FIG. 36 is a block diagram of a driving mechanism of a conventional pinch roller. Referring to FIGS. 35 and 36, a capstan motor 61 is fixed to the lower surface of main chassis 4, and a capstan shaft 62 protrudes from the upper surface of main chassis 4, and cassette 3 is loaded at a predetermined position.
Is configured to be inserted into the mouse 63.

A pinch roller lever 65, on which the pinch roller 64 is rotatably supported, is rotatably supported by a shaft 66 erected on the main chassis 4, and the pinch roller double-acting lever 67 is a pinch roller lever 65. The pinch roller double-acting lever 67 and the pinch roller lever 65 are connected by a pinch roller pressing spring 69.
The pinch roller double-acting lever 67 is engaged with a cam groove (not shown) formed in the master cam gear 16, and rotates and swings about the shaft 66 by rotation of the cam groove.

When the pinch roller double-acting lever 67 rotates counterclockwise, it is pulled by the pinch roller pressing spring 69 and the pinch roller lever 65 also moves 65 'counterclockwise.
, And the pinch roller 64 contacts the capstan shaft 62. If the pinch roller double-acting lever 67 tries to rotate a little more, the pinch roller lever 65 cannot rotate, so the pinch roller double-acting lever 6
7 rotates counterclockwise about an axis 68. That is, the pinch roller press-fit spring 69 is extended, and the attractive force is applied to the pinch roller lever 65, and the pinch roller 6
4 is pressed against the capstan 62.

FIG. 37 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining a conventional traveling system. FIG. 38 is a plan view of a traveling system of a conventional magnetic recording / reproducing apparatus. Referring to FIGS. 37 and 38, Su tape guide 70 is provided upright on main chassis 4. Also, the main chassis 4
A Si roller 72 is rotatably supported by a shaft 71 provided upright. An erase head 73 is also fixed to the main chassis 4.

The magnetic tape 2 shown by a thin line
A state in which the vehicle is traveling in the search mode will be described. At the entrance side, the magnetic tape 2 has a guide pole 74 erected in the cassette 3, a Su tape guide 70, a tension post 45 ′ at a loading position, and a Si roller 7.
2. Erase head 73, Su at loading position
It winds around the side guide roller 22 ′ and the Su-side inclined pole 24 ′ at the loading position and winds around the rotating magnetic head drum 21.

On the exit side, the magnetic tape 2 coming out of the rotary magnetic head drum 21 is fed to the Tu-side inclined pole 25 ', Tu-side guide roller 23', A / C
The head 60 wraps around the fixed guide 48, passes between the pinch roller 64 ′ pressed against the capstan shaft 62 and the capstan shaft 62, and wraps around the guide pole 75 erected in the cassette 3 to form the cassette 3. Get in.

The half load shaft 49 returns to the standby position shown in FIG. 37 in the recording / reproduction / search mode. The magnetic tape 2 is parallel to the main chassis 4 on the left side of the Su-side inclined pole 24 'and on the right side of the Tu-side inclined pole 25'.
5 'and inclined along a lead (not shown) of the lower drum 17. Therefore, in this tape traveling system, the tape winding angle around the Su-side inclined pole 24 'and the Tu-side inclined pole 25' is very large. Of course, it is also possible to form a vertical fixed post on another main chassis 4 into a rotary post.

FIG. 39 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining a conventional tape tension control. One of the tension bands 102 is fixed to the main chassis 4, and the other is rotatably supported at a predetermined position of the tension lever 46.
It is wrapped around the side. The tension band 102 is largely loosened from the Su reel base 78 during tape unloading, and the Su reel base 7 during tape loading.
8, the Su reel base 78 is tightened or released in accordance with the rotation swing of the tension lever 46 in order to keep the tape tension value constant at all times. That is, Su
The braking force against the rotation of the reel base 78 is adjusted. In other words, if the tape tension value is too high, the tension lever 46 is pushed back by the magnetic tape 2 and rotates clockwise, the tension band 102 is loosened from the Su reel base 78, and the braking force on the Su reel base 78 is weakened. Tension value decreases. If the tape tension value decreases too much, the tension lever 46 rotates counterclockwise due to the bias of the tension spring 47, and the tension band 102 tightens the Su reel base 78. That is, the braking force on the Su reel base 78 increases, and the tape tension value increases.

The operation of the tension lever 46 during tape unloading will be described. At the time of tape loading, the tension lever 46 is at the position indicated by 46 '. The tension release lever 103 is rotatably supported by a shaft 104 erected on the reel block chassis 76, and rotates and swings in accordance with the movement of the brake shifter 84, and is located at a position 103 'during tape loading.
Su side pole base 26 during tape unloading,
Prior to the return of the Tu-side pole base 27 to the unloading position, it is configured to rotate to the position indicated by 103.

When the tension release lever 103 rotates, the post 1 formed on the tension release lever 103 is rotated.
05 also rotates from the position indicated by 105 'to the position indicated by 105. Then, the contact portion 106 ′ of the tension lever 46 at the position indicated by 46 ′ is released by the post 105, and the tension lever 46 slightly rotates clockwise by a predetermined angle against the bias of the tension spring 47. When the tension lever 46 rotates, the friction reducing cover 10 fixed to the tip of the tension lever 46 is rotated.
9 'is configured to be located almost directly above the Su loading rail 28. There Su pole base 26
Comes back and the Su pole base wall 107 ', 10
The cover 109 'is pushed back in the unloading direction by 8', and the tension lever 46 is eventually returned to the position indicated by 46 against the bias of the tension spring 47.

FIG. 40 shows a conventional Su, Tu reel base 78,
It is a top view of the conventional magnetic recording / reproducing apparatus for explaining the drive mechanism of No. 79. FIG. 41 shows Su, Tu reel base 78,
It is a block diagram of the drive system of 79. A reel unit 77 formed on a reel block chassis 76 is fixed to the lower surface of the main chassis 4. A Su reel base 78 and a Tu reel base 79 are rotatably supported by the reel unit 77, respectively. Capstan motor 6
A V pulley 80 is provided coaxially with the capstan motor 61 on the lower surface of the capstan motor 1, and a rubber belt 83 is hung between the V pulley 82 of the idler unit 81 provided on the reel unit 77, and the capstan motor The rotation of 61 is transmitted to idler unit 81. The idler unit 81 has a built-in clutch (not shown), and an idler gear 87 that transmits rotation according to the forward / reverse rotation of the rubber belt 83 swings to the left or right, and the Su reel base 78 on the left or the right. Is transmitted to the Tu reel base 79. The idler unit 81 moves the Su reel base 78 counterclockwise or T
The magnetic tape 1 is rewound or wound by rotating the u-reel base 79 clockwise.

A brake shifter 84 is provided on the reel unit 77 so as to reciprocate in the left-right direction. A shaft 85 erected downward on the relay shifter 86 is rotatably supported by the main chassis 4. . That is, the relay shifter 86 rotatably supported is connected to the master cam gear 1.
It is configured to reciprocate as it rotates and swings according to the rotation of 6.

By moving the brake shifter 84, the FF
At the time of REW and at the time of recording / reproduction / search (forward / reverse), the idler gear 87 is moved up and down (in the direction perpendicular to the paper surface) to take up and down two positions, and the gear ratio is changed by changing the meshing gear. That is, at the time of FF / REW, the idler gear 87 rises and the idler gear A (87a) and the gears A (78a) formed on the Su reel base 78, Tu
The gear C (79a) formed on the reel base 79 meshes,
Idler gear 87 for recording / reproduction / search (forward / reverse)
Descends and idler gear B (87b) and Su reel base 7
8, the gear B (78b) formed on the Tu reel base 79 meshes with the gear B (78b).

Su main brake 90 and Tu main brake 91 to which brake pads 88 and 89 are attached, respectively.
Are shafts 92 and 9 erected on the reel block chassis 76
3 are rotatably supported by each other, and are attracted to each other by a main brake spring 94. That is, Su
・ Tu main brake 90 ・ 91 Brake pad 88
89 are urged in the direction of pressing against the side surfaces of the Su / Tu reel stands 78 and 79, respectively. The Su main brake 90 and the Tu main brake 91 are configured so as to be pressed against or released from the Su reel base 78 and the Tu reel base 79, respectively, according to each operation mode of the mechanism, that is, according to the movement of the brake shifter 84.

A lock release pin 95 is fixed to the idler unit 81 so as to protrude toward the upper surface of the main chassis 4. When the cassette 3 is mounted, the lock release pin 95 is inserted into the cassette 3 so that the Su reel 96 and the Tu reel 9
7 works to release the lock.

A reverse guide 100 having a fixed post 99 erected rotatably by a shaft 98 erected on the main chassis 4 includes a reverse guide spring 10.
1 urged in a counterclockwise direction. The reverse guide 100 is provided in the mouse 63 of the cassette 3 at the time of recording / reproducing / searching (normal) / FF / REW, and rotates clockwise at a predetermined angle according to the rotation of the relay shifter 86 at the time of searching (reverse). Then, the magnetic tape 1 is wound around the fixed post 99 and kept away from the capstan shaft 62.

That is, at the time of search (reverse), the Tu reel 9
In order to prevent the A / C head 60 from becoming unable to read the control signal due to the influence of the variation of the height of the magnetic tape 1 such as the variation of the winding height of the magnetic tape 1 at 7, In this case, the winding angle around the guide pole 75 is reduced, a loop of the magnetic tape 1 is formed to extend the running system path, and the guide is guided by the fixed post 99 to correct the fluctuation of the winding height.

[0035]

As shown in FIG. 38,
In the conventional magnetic recording / reproducing apparatus, since the magnetic tape 2 is inclined only by the Su-side inclined pole 24 'and the Tu-side inclined pole 25', the winding angle of the magnetic tape 2 around the inclined pole is increased. In addition, there are many fixed posts having a large winding angle of a magnetic tape such as a tension post and a fixed guide, but these can be replaced by rotating posts. However, it is not possible with inclined poles. A large wrap angle around the inclined pole means a large tension loss due to friction between the magnetic tape and the inclined pole.

As shown in FIG. 39, in tension control using the tension band 102, Su
Since the fluctuation width of the tension is large due to the influence of the outer peripheral swing of the reel base 78 and the brake torque of the Su reel base 78 is constant, the tape tension increases as the winding diameter of the magnetic tape decreases. . In order to record and reproduce signals for a long time in a fixed cassette size, the magnetic tape must be thin. In order to record and reproduce a signal on a thin magnetic tape with high precision, it is necessary to make the magnetic tape run stably. In order to do so, it is particularly necessary to reduce the tape tension and suppress the fluctuation. However,
It is very difficult for a conventional magnetic recording / reproducing apparatus to use a traveling system and a mechanical traverse requiring the traveling system.

The present invention has been made to solve such a conventional problem. An object of the present invention is to provide a magnetic recording / reproducing apparatus capable of recording and reproducing a signal on a thin magnetic tape with high accuracy.

Another object of the present invention is to provide a magnetic recording / reproducing apparatus capable of transmitting power to a loading system and a tension post driving system with a smaller number of components and a smaller space.

Still another object of the present invention is to provide a magnetic recording / reproducing apparatus capable of transmitting power to a pinch roller drive system with a smaller number of parts.

Still another object of the present invention is to provide a magnetic recording / reproducing apparatus which can perform loading with a guide roller provided on a pole base and a magnetic tape in contact with each other.

[0041]

According to a first aspect of the present invention, there is provided a magnetic recording / reproducing apparatus including a chassis, a rotating head drum mounted on the chassis, a loading motor mounted on the chassis, and a rotatable mounting on the chassis. A transmission gear for transmitting the driving force of the loading motor;
A rack member having a second rack and reciprocally mounted on the chassis and reciprocating on the chassis by the rotational force of the transmission gear; and a rack member rotatably mounted on the chassis and driven by the rotational force of the transmission gear A pinch roller, a loading gear rotatably mounted on the chassis and meshing with the first rack, a pole base movably mounted on the chassis and driven by loading, and a rotatably mounted on the chassis. A drawer post drive gear meshing with the second rack, a drawer post, the drawer post lever being rotatably mounted on the chassis, driven by the drawer post drive gear, and a rotatable mount on the chassis. And a tension arm driven by a reciprocating movement of the rack member. Timing of starting the rotation of the rotation start and the lead post drive gear loading gear is different from the.

According to a second aspect of the present invention, there is provided a magnetic recording / reproducing apparatus further comprising a master cam gear rotatably mounted on a chassis and meshing with a transmission gear, and a rack member connected to the magnetic recording / reproducing apparatus according to the first aspect. And a master cam lever having a master cam follower shaft engaged with a cam groove provided in the master cam gear.

According to a third aspect of the present invention, there is provided the magnetic recording / reproducing apparatus according to the first aspect, wherein the pinch roller is pressed and separated from the capstan shaft by a cam formed integrally with the transmission gear. Through a cam follower shaft that engages with the cam.

A magnetic recording / reproducing apparatus according to a fourth aspect is dependent on the magnetic recording / reproducing apparatus according to the first aspect, and in a loading state, the pinch roller is arranged on the non-magnetic surface side of the magnetic tape.

A magnetic recording / reproducing apparatus according to a fifth aspect is dependent on the magnetic recording / reproducing apparatus according to the first aspect, wherein a mouse for a cassette on which a pull-out post is arranged at the time of tape unloading, and a pole base are arranged. It is the same as the mouse in the cassette.

[0046]

[0047]

[Function] The Su Pole Base, Tu Pole Base, Tension Lever, and Tape Pull Out Post as the mechanism for loading the tape into the tape path do not damage the tape during tape loading. Moving at a constant speed,
Each of the above-mentioned mechanisms according to the first aspect of the present invention is configured so that the tape is not twisted in the course of the process until a complete tape path is formed.

[0048]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. (1) Traveling System A traveling system according to an embodiment of the present invention will be described with reference to FIG. FIG. 2 is a plan view of one embodiment of the present invention. A rotating magnetic head drum 202 is fixed to the front side of the main chassis 201 via a drum base (not shown). The rotating magnetic head drum 202 is slightly inclined to the left. A drum motor 203 is mounted on the lower surface of the rotating magnetic head drum 202.

Referring to the upper left of FIG. 2, reference numeral 233 'denotes a tension post in a tape loading state. The tension post 233 'is a rotating post. A shaft 204 is erected on the main chassis 201.
04, the Su guide pole movable arm 205 is rotatably supported. Su guide pole movable arm 20
5, a Su guide pole 206 is erected vertically downward, and the Su guide pole movable arm 205 is urged clockwise by a leaf spring 207. The locking portion 208 of the Su guide pole movable arm 205 is
The stopper 209 is in the position shown in FIG.

Reference numeral 210 denotes a Su auxiliary inclined post fixed to the main chassis 201. Reference numeral 211 denotes a Su auxiliary inclined guide roller supported by the main chassis 201.

The FE (full width erase) head 212 is fixed to the FE head arm 213. FE head 212
Serves as an inclined fixed guide. . The FE head arm 213 is a shaft 2 fixed to the main chassis 201.
14 is rotatably supported, and is urged by a spring 215 in a counterclockwise direction. A shaft 216 having a threaded portion on the head is fixed to the main chassis 201. Axis 2
An FE is attached to the adjustment nut 217 screwed into the screw portion of No. 16.
The locking portion 218 of the head arm 213 is in contact. F
The lower portion of the adjusting nut 217 with which the locking portion 218 of the E head arm 213 contacts is formed in a conical shape. By rotating the adjusting nut 217, the conical surface of the adjusting nut 217 moves up and down, and the FE head arm 213 is moved. FE head 212 is rotated clockwise / counterclockwise,
It is possible to adjust the tape running by protruding or retreating in the 19 running paths. Reference numeral 220 'denotes a Su pole base 2 positioned by a Su catcher (not shown).
21 'is a Su guide roller supported by 21'.

Next, the outlet side of the rotary magnetic head drum 202 will be described. The Tu guide roller 223 'is supported by a Tu pole base 222' positioned by a Tu catcher (not shown). In addition, the Tu main inclination guide 224 'is the Tu pole base 22.
2 '. The A / C head 225 is fixed to the main chassis 201, and the A / C head 225 plays a role of an inclined fixed guide. A / C head 2
The description of the position adjusting mechanism 25 will be omitted.

The Tu auxiliary tilt guide roller 226 and the Tu auxiliary tilt post 227 are erected on the main chassis 201. 228 'is a tape pull-out post in a state where the magnetic tape 219 is pulled out. The tape pull-out post 228 'is a rotating post.

A capstan motor 230 having a capstan shaft 229 is fixed to the back of the main chassis 201, and the capstan shaft 229 protrudes from the surface of the main chassis 201. 231 'is a capstan shaft 229
Is a pinch roller in a pressed state. Tu tape guide 2
Reference numeral 32 stands on the main chassis 201. The Tu tape guide 232 is a rotating post.

FIG. 1 shows the running path of the magnetic tape 219.
This will be described with reference to FIG. FIG. 1 is a plan view of a tape path section according to one embodiment of the present invention. The magnetic tape 219 coming out of the Su reel 305 of the cassette is
3 ', Su guide pole 206, Su auxiliary inclined post 2
10, Su auxiliary inclined guide roller 211, FE head 2
12. Wind around the Su guide roller 220 'and around the rotating magnetic head drum 202.

The magnetic tape 219 coming out of the rotating magnetic head drum 202 is supplied with a Tu guide roller 223 ', a Tu main tilt guide 224', an A / C head 225, a Tu auxiliary tilt guide roller 226, a Tu auxiliary tilt post 227, and a tape pull-out. The capstan shaft 22 is wound around the post 228 '.
9 and the pinch roller 231 ′, wrapped around the Tu tape guide 232, and again
06.

Here, the magnetic tape 219 is parallel to the main chassis 201 up to the Su auxiliary inclined post 210,
From the Su auxiliary tilting post 210, it starts to tilt and rise.
While the magnetic tape 219 is wrapped around the rotating magnetic head drum 202 by the Su guide roller 220 ′, the height of the magnetic tape 219 falls about twice as high as that at the entrance side, and the Tu guide roller 22
Turned back at 3 'and started to rise again, Tu auxiliary tilt post 2
It returns to parallel again at 27.

Here, the fixed posts are the Su guide pole 206, the Su auxiliary inclined post 210, and the FE head 21.
2, Tu main inclined guide 224 ', A / C head 225,
Only the Tu auxiliary inclined post 227 has a total tape wrap angle of about 100 °, which is much smaller than the total tape wrap angle of the conventional fixed post of about 300 °. (2) Master Cam Gear Drive System Next, a master cam gear drive system according to an embodiment of the present invention will be described. FIG. 3 is a plan view of one embodiment of the present invention for explaining the drive system of the master cam gear of the embodiment of the present invention. FIG. 4 is a block diagram of a power transmission mechanism of the master cam gear drive system. First, the power transmission mechanism of the master cam gear drive system will be briefly described with reference to FIGS. The driving force of the loading motor 235 includes a worm 242, a worm wheel 244, a gear A24.
5, transmitted to the master cam gear 258 via the gear B246, the gear C247, the gear D251, the gear E253, the gear F254, and the idler gear 255.

Next, the drive system of the master cam gear will be described in detail with reference to FIG. The loading motor 235 has a motor angle 236 fixed to the main chassis 201.
It is stuck to. A worm joint 238 is press-fitted into the rotation shaft 237 of the loading motor 235. The worm support shaft 239 is press-fitted into the worm support 240, and the worm support 240 is loosely fitted into the round hole 241 provided in the motor angle 236, so that the inclination and position of the worm support shaft 239 can be freely set within a small range. It is configured to be mobile. That is, the round hole 24
1 and the worm receiver 240 form a self-aligning structure of the worm support shaft 239.

The worm 242 is supported on one side by a worm joint 238. The other side of the worm 242 is provided with a hole (not shown) for fitting with the worm support shaft 239. The other side of the worm 242 is rotatably supported by the worm support shaft 239 in this hole. The rotation of the loading motor 235 causes the rotation shaft 237 to move through the worm joint 238 to the worm 2.
42. Worm 242 and worm receiver 24
Between 0, a washer 243 for friction reduction is inserted.

A gear A 245 formed integrally with the worm wheel 244 is rotatably supported by a shaft 248 erected on the main chassis 201. Gear B24
The gear C247 integrally formed with the gear 6 is rotatably supported by a shaft 249 erected on the main chassis 201. The worm 242 meshes with the worm wheel 244.

The gear A 245 meshes with the gear B 246, and the gear C 247 is a shaft 25 mounted on the main chassis 201.
0 so as to mesh with a gear D251 rotatably supported by the gear.

The integrally formed pinch roller pressing cam 252, gear E 253, and gear F 254 are rotatably supported by a shaft 256 erected on the main chassis 201. The idler gear 255 is rotatably supported by a shaft 257 erected on the main chassis 201.
The master cam gear 258 is rotatably supported by a shaft 259 erected on the main chassis 201. The gear D251 meshes with the gear E253, the gear F254 meshes with the idler gear 255, and the idler gear 255 meshes with the master cam gear 258. That is, when the loading motor 235 rotates forward, the master cam gear 258 rotates counterclockwise.

Next, the operation of the master cam gear 258 will be described. FIG. 5 is a plan view of the embodiment of the present invention for explaining the operation of the master cam gear of the embodiment of the present invention. A master cam lever 261 having a master cam follow shaft 260 erected upward is rotatably supported by a shaft 262 erected on the main chassis 201, and is located between the master cam gear 258 and the main chassis 201. Master cam follow shaft 260
Are cam grooves 263 formed in the master cam gear 258.
And the distance between the cam groove 263 and the shaft 259 increases with the rotation of the master cam gear 258, and the master cam follow shaft 260 moves from the position indicated by 260 to the position indicated by 260 ′. And move. That is, the master cam lever 261 is moved 261 'from the position indicated by 261.
Is rotated to the position indicated by. 261 is the end of unloading, and 261 'is the end of loading.

The master cam lever 261 further includes
The shaft 264 extends downward through the main chassis 201 and moves to a position indicated by 264 ′ as the master cam lever 261 rotates. Here, the increase in the distance of the cam groove 263 from the shaft 259 is caused in the section A (26).
Ending in 5), the distance is constant in section B (266). That is, the rotation of the master cam lever 261 is determined by the movement of the master cam follow shaft 260 in the section A of the cam groove 263.
When the master cam follower shaft 260 enters the section B (266), the master cam lever 261 stops. End sensor lever 26
7. The pinch release sensor lever 268 is rotatably supported by shafts 269 and 270 erected on the main chassis 201, respectively. The end sensor (switch) 271 is fixed to an end sensor board 272 fixed to the main chassis 201. The pinch separation sensor (switch) 273 is fixed to a pinch separation sensor substrate 274 fixed to the main chassis 201.

The master cam gear 258 has a pin A (2
75), and the pin B (276) is fixed upward.
In the initial state (tape unloading state), the pins A and B are at positions 275 and 276, respectively.
When the tape loading is completed (when the rotation of the master cam gear 258 is completed), the pin A (275) rotates from the position indicated by 275 to the position indicated by 275 ', and the end sensor lever 267 pushes the pin A (275'). Then, since the operation lever 277 of the end sensor 271 is pressed by the end sensor lever 267, the end sensor 271 is turned ON, and the completion of tape loading (the completion of rotation of the master cam gear 258) can be detected.

At the time of FF / REW, the pinch roller is rotated from the position indicated by 231 'to the position indicated by 231 while the magnetic tape 219 is being loaded.
1 'is removed from the capstan shaft 229. The operation of the pinch roller 231 will be described later. As described above, the sensor for detecting that the pinch roller 231 'is in the detached state is the pinch detached sensor 273. After the master cam gear 258 has completed the counterclockwise rotation,
When it rotates clockwise and returns to the position where the pinch roller 231 ′ is separated from the capstan shaft 229, the pin B
(276) comes to the position indicated by 276 '. Then, the pinch release sensor lever 268 is pressed by the pin B (276 ') and rotates counterclockwise, and the operation lever 278 of the pinch release sensor 273 is pressed by the pinch release sensor lever 268, so that the pinch release sensor 273 is turned on. , Pinch roller 2 in tape loading state
31 'can be detected as having been detached from the capstan shaft 229. (3) Pinch Roller Drive System Next, a pinch roller drive system according to an embodiment of the present invention will be described. FIG. 6 is a plan view of an embodiment of the present invention for explaining the operation of the pinch roller drive system of the embodiment of the present invention, and FIG. 7 is a side view. 6 and 7 will be mainly described with reference to FIG. The pinch roller 231 is
Shaft 28 erected downward on pinch roller lever 279
It is rotatably supported by 0. Pinch roller 23
1 and the shaft 280, the shaft 280 of the pinch roller 231 is provided.
A self-aligning mechanism (not shown) for tilting the direction is provided, and when the pinch roller 231 is pressed against the capstan shaft 229, the pinch roller 231 is moved to the capstan shaft 22.
9 is configured. Pinch roller lever 27
9 is a boss 28 fixed to the pinch roller lever 279.
4 (see FIG. 6), and is supported by a shaft 281 erected on the main chassis 201 so as to be rotatable and movable in the thrust direction.

Referring to FIG. 6, pinch pressure lever 282
And the elevator 283 each have the pinch roller lever 27
Nine bosses 284 rotatably supported. A tension spring 285 is engaged between the pinch pressure lever 282 and the pinch roller lever 279,
When the tape is unloaded, the pinch roller lever 279 and the pinch roller lever 279 shown in FIG. The positional relationship is maintained.

Further, a tension spring 287 is hung between the elevator 283 and the pinch roller lever 279, and the elevator 283 is pulled by the urging force of the tension spring 287 to a locking portion 288 formed on the pinch roller lever 279. In contact. The pinch roller lever 279, the pinch pressure lever 282, and the elevator 283 are configured not to separate in the direction of the shaft 281.

The pinch roller elevating cam 290 shown in FIG. 7 will be described below. FIG. 8 is a sectional view of the pinch roller elevating cam. Referring to FIG. 7 and FIG.
The cam cap 291 is fitted on the head of the pinch roller elevating cam 290 having
Reference numeral 91 is formed so as to form a part of the cam groove 289, and the cam cap 291 functions as a bearing for rotatably supporting the pinch roller elevating cam 290 on the shaft 250.

Further, two bosses 292 provided below the pinch roller elevating cam 290 rotate integrally with the gear D 251 according to the rotation of the gear D 251.

Referring to FIG. 8, a cam follower 293 having a truncated cone shape is provided in elevator 283, and cam follower 293 is fitted in cam groove 289. Cam groove 2
Reference numeral 89 denotes an upper portion A 294 having a constant height, a spiral B portion 295, and a lower portion C 296 having a constant height formed continuously.

FIG. 10 is a cam diagram of the cam groove 289 shown in FIG. The portion between 1 and 2 is the A portion 294 shown in FIG. Section B 295 is between 2 and 3. The portion between 3 and 4 is the C section 296. The same will be described with reference to a plan view of a pinch roller elevating cam shown in FIG. Starting from position 1 (which matches the number in FIG. 10), position 2 → position 3 in a counterclockwise direction
→ A cam groove 289 is formed to pass through position 4. The pinch roller elevating cam 290 rotates clockwise.

Referring to FIGS. 6 and 7, elevator 2
83 is provided with a pair of locking portions 297 so as to sandwich the pinch roller elevating cam 290 from both sides, and the elevator 283 is configured to be unable to rotate around the shaft 281. Therefore, the pinch roller elevating cam 29
When 0 rotates, the pinch roller lever 279, the pinch pressure lever 282, and the elevator 283 move up and down following the movement of the cam groove 289.

As shown in FIG. 7, in the tape unloading state, the pinch roller lever 279 is at a high position, and the magnetic tape 219 is pulled out by the tape pull-out post 228 '. However, the pinch roller 231 is configured to descend after moving to a position where the pinch roller 231 does not interfere with the descending pinch roller 231.

The pinch roller 231 is connected to the capstan shaft 22.
The operation up to contact with No. 9 will be described. FIG. 12 is a block diagram illustrating a process until the pinch roller 231 contacts the capstan shaft 229. This will be described with reference to FIG. When the loading motor 235 shown in FIG. 6 rotates forward, the gear D251 rotates clockwise, and at the same time, the pinch roller lifting cam 290 (see FIG. 7) also rotates clockwise.

As shown in FIG. 9, even when the position 2 of the pinch roller elevating cam 290 rotates to the position indicated by the position 1, the pinch roller 231 (see FIG. 7) does not descend. During this time,
As shown in FIG. 7, the magnetic tape 219 is loaded, that is, the tape pull-out post 228 'pulls out the magnetic tape 219.

Referring again to FIG. 9, while the position 3 of the pinch roller elevating cam 290 rotates to the position indicated by the position 1, the pinch roller lever 279, the pinch pressure lever 282, and the elevator 283 are rotated as shown in FIG. , Each 2
279 ', 28 from the positions indicated by 79, 282, 283
It descends to the position shown by 2 'and 283'. That is, the pinch roller 231 descends from the position indicated by 231 to the position indicated by 231 ″.
Even if 90 rotates, the height of the pinch roller 231 does not change.

As shown in FIG. 7, the pinch pressure lever 28
2 is lowered to a height at which the cam follower shaft 298 formed on the pinch pressing lever 282 engages the pinch roller pressing cam 252. As shown in FIG. 6, the pinch roller pressing cam 252 is an outer peripheral cam, and the loading motor 235
Rotates forward, the pinch roller pressing cam 252 formed integrally with the gear E253 also rotates counterclockwise. The cam follower shaft 298 is rotated by the outer circumference of the pinch roller pressing cam 252 counterclockwise from a position indicated by 298 to a position indicated by 298 '. The rotation of the pinch pressure lever 282 is controlled by the rotation of the cam follower 2 of the elevator 283.
93 (see FIG. 8) is performed while moving between position 3 and position 4 shown in FIG.

In FIG. 6, when the pinch pressing lever 282 rotates counterclockwise, since the pinch pressing lever 282 and the pinch roller lever 279 are connected by the extension spring 285, the pinch roller lever 279 also rotates counterclockwise. . Since the elevator 283 cannot rotate as described above, the pinch roller lever 279 is
3 rotates against the bias of the tension spring 287 applied between them (the biasing force of the tension spring 285 is much greater than that of the tension spring 287). Pinch roller lever 279
Rotates, and the pinch roller 231 moves to 231 ″ shown in FIG.
When the pinch roller 231 moves from the position indicated by (from the position indicated by 231 in FIG. 6 in plan view) to the position indicated by 231 ′, the pinch roller 231 comes into contact with the capstan shaft 229.

The pinch roller 231 is connected to the capstan shaft 22.
9, the pinch pressure lever 282 is further configured to rotate slightly further, so that the tension spring 28
5 is extended, and the tension spring 287 is further extended.
Capstan shaft 229 with biasing force minus 87
Will be crimped.

By the way, between the pinch roller lever 279 and the elevator 283, a post compression spring (leaf spring) 2 is provided.
99 (see FIG. 11), and the post compression spring 299 is configured to move integrally with the elevator 283. That is, the post compression spring 299 is
One can move in the axial direction, but cannot rotate. The post compression spring 299 descends together with the pinch roller 231, and eventually comes into contact with the tape pull-out post 228 'as shown in FIG. Since the post compression spring 299 is further configured to descend together with the pinch roller 231 after the contact, as shown in FIG. 11, the post compression spring 299 changes from the shape indicated by 299 to the shape indicated by 299 ′. It flexes and presses the tape pull-out post 228 '.

Here, loading of the cassette 234 into a predetermined position will be described. As shown in FIG. 7, a cassette 234 inserted into an insertion opening of a cassette (not shown) is indicated by 234 '. The cassette 234 is 234 from the position shown at 234 '.
Is moved along the path indicated by the arrow A by the cascon to the position shown in FIG.

Referring to FIG. 6, reference numerals 300 and 301 denote stepped pins erected on main chassis 201, which are fitted into holes (not shown) of cassette 234 to position cassette 234 in the thickness, width and depth directions. Is a member that performs the following. The pins 302 and 303 erected on the main chassis 201 are receptacles in the thickness direction of the cassette 234. The pins 304 erected on the main chassis 201 are inserted into the loaded cassette 234 and function to unlock the Su reel 305 and the Tu reel 306 incorporated in the cassette 234. The cassette 234 includes the mouse 307,
08, a door 309 (see FIG. 7), and the door 309 is a boss 310 formed on the door 309 (see FIG. 7).
And the mouses 307 and 308 are opened by rotating the mouse.

Referring to FIG. 7, cassette 234 ', which is now in the cassette insertion slot, is inserted into main chassis 2 by the cassette.
01, the lower surface 31 of the door 309 '.
1 ′ comes into contact with the inclined surface 313 of the open angle 312 fixed to the main chassis 201. At this time, the lock of the door 309 'has already been released by the cassette.
Further, as the cassette 234 'is transported in the same direction, the door 309' rides on the upper surface 314 of the open angle 312. That is, the door 309 'is slightly opened. Next, when the cassette 234 'is lowered for loading, the door 309' is further opened because the door 309 'is kept in contact with the open angle 312, and when the cassette 234 is loaded, the door 309 is opened to the state shown by 309. Therefore, the magnetic tape 219 can be loaded. (4) Loading System A loading system according to one embodiment of the present invention will be described. FIG. 13 is a plan view of a loading system in an unloaded state according to one embodiment of the present invention. FIG. 14 is a side view of a loading system according to an embodiment of the present invention. FIG.
3, the structure of a loading system according to an embodiment of the present invention will be described. However, see also FIG. 14 for the three-dimensional positional relationship.

The loading rack 315 has a long hole 318, 319 provided in the loading rack 315, and the shaft 3, which is provided on the main chassis 201, faces downward.
16 and 317, and can reciprocate in the direction of the slots 318 and 319. Loading rack 31
5, a rack gear 320 is formed.
01 is meshed with a Tu loading gear 322 that is rotatably supported by a shaft 321 erected downward.

The connecting gear 323 is also rotatably supported by the shaft 321, and is configured to rotate integrally with the Tu loading gear 322 in accordance with the rotation of the Tu loading gear 322. The Su loading gear 324 is rotatably supported by a shaft 325 erected downward on the main chassis 201, and meshes with the connection gear 323.

The Tu loading arm A326 has the shaft 32
1 and rotatably supported, and connected to the Tu loading gear 322 via a tension spring 327. That is, when the Tu loading gear 322 rotates counterclockwise, the Tu loading arm A 326 also moves the tension spring 3.
It is pulled by the urging force of 27 and rotates counterclockwise. T
When the u-loading gear 322 rotates clockwise, the Tu-loading arm A326 is locked by the locking portion formed on the Tu-loading gear 322, so that the Tu-loading arm A326 rotates integrally with the Tu-loading gear 322. I do.

One end of the Tu loading arm B 328 is connected to the shaft 32 erected on the Tu loading arm B 328.
9 is rotatably supported by being inserted into a Tu loading arm A326, and the other end is a Tu pole base 2.
22 is rotatably supported by a shaft (not shown) provided downward. The Tu pole base 222 is configured to be reciprocally guided by a Tu rail 330 fixed to the main chassis 201.

The Su loading arm A331 has the shaft 32
5 and the Su loading gear 3
24 and a registration mark spring 332. That is, when the Su loading gear 324 rotates clockwise, the Su loading arm 331 also moves the registration mark spring 33.
2 and rotate clockwise. When the Su loading gear 324 rotates in the counterclockwise direction, the Su loading arm A331, like the Tu side, rotates.
Is configured to rotate integrally with the Su loading gear 324. One end of the Su loading arm B333 is connected to the shaft 3 erected on the Su loading arm B333.
34 is rotatably supported by passing through the Su loading arm A331, and the other end is rotatably supported by a shaft (not shown) provided on the Su pole base 221 downward. The Su pole base 221 is configured to be reciprocated by being guided by a Su rail 335 fixed to the main chassis 201.

The operation of the embodiment of the present invention from the unloading state to the loading state will be described with reference to FIGS. FIG. 15 is a plan view of a loading system in a loading state according to one embodiment of the present invention. FIG. 16 is a block diagram illustrating a transition from the unloading state to the loading state. When the loading motor 235 (not shown in FIG. 15) rotates forward, the master cam gear (not shown in FIG. 15) 258 rotates counterclockwise via the power transmission mechanism shown in FIG. When the master cam gear 258 rotates counterclockwise, the master cam lever 261 is moved from 261 to 26
Rotate to 1 '.

Since the shaft 264 provided on the master cam lever 261 is fitted into the elongated hole 336 provided on the loading rack 315, the loading rack 31
5 moves from the position indicated by 315 to the position indicated by 315 '. When the rack gear 320 moves to 320 ',
The Tu loading gear 322 rotates counterclockwise, and T
Since the u-loading arm A326 rotates counterclockwise, the Tu pole base 222 is pushed out toward the rotating magnetic head drum 202 via the Tu-loading arm B328, and is loaded.

At the same time, since the Su loading gear 324 rotates clockwise via the connecting gear 323, the Su loading arm A331 also rotates clockwise, and the Su pole base 221 rotates via the Su loading arm B333. It is extruded to the 202 side and loaded. Since the FE head arm 213 protrudes into the loading path of the Su pole base 221, the sliding portion 337 of the FE head arm 213 to which the FE head 212 is fixed is moved while the Su pole base 221 is being loaded. Boss (not shown) of Su guide roller 220 supported by
FE head arm 2
13 is rotated clockwise against the bias of spring 215. After the Su pole base 221 has passed through the sliding portion 337, the FE head arm 213 returns to the position shown in FIG. 15 (FIG. 13) by the bias of the spring 215.

As the Su and Tu pole bases 221 and 222 are loaded, they come into contact with Su and Tu catchers (not shown), respectively. However, since the Su and Tu loading gears 324 and 322 still slightly rotate clockwise and counterclockwise, respectively,
The u and Tu pole bases 221 ′ and 222 ′ are pressed against the respective catchers by the urging forces of the register mark spring 332 and the extension spring 327. Magnetic tape 219
15 is shown in FIG. At the time of tape unloading, the operation is completely the opposite, and a description thereof will be omitted. (5) Tension post drive system A tension post drive system according to an embodiment of the present invention will be described. FIG. 17 is a plan view of a tension post drive system according to one embodiment of the present invention. FIG. 18 is a side view thereof. Referring to FIG. 17, tension chassis 338 is fixed to the lower surface of main chassis 201. The tension relay lever 339 is rotatably supported by a shaft 340 provided upright on the tension chassis 338, and a pin 341 provided upright on the tension relay lever 339 is fitted into an elongated hole 342 provided in the loading rack 315. ing.

The double acting lever 343 is rotatably supported by a shaft 340, and the double acting lever 343 and the tension relay lever 339 are connected by a tension spring 344. That is, when the double acting lever 343 is fixed, the tension relay lever 339 is urged to rotate clockwise. A pin 349 is provided upright on the tension relay lever 339, and the pin 349 is configured to be able to abut on a wall 350 provided on the double-acting lever 343.
As shown in (1), in the tape unloading state, the pin 349 and the wall 350 are not in contact, and there is play (interval) between the two. The extension spring 344 aims at eliminating the play of the double-acting lever 343 in the state where the play exists.

The relay gear 345 is also rotatably supported by the shaft 340. A registration mark spring 346 is hung between the relay gear 345 and the double-acting lever 343.
Abuts against a wall 348 provided on the double-acting lever 343.

The arm drive gear 351 is connected to a boss 35 by a shaft 352 that is provided upright on the tension chassis 338.
5 (see FIG. 18) so as to be rotatable,
It is in mesh with the relay gear 345.

The arm drive lever 354 is rotatably supported by a shaft 352 via a boss 355 (see FIG. 18) fixed to the arm drive lever 354. The arm drive lever 354 is configured to rotate integrally with the arm drive gear 351. The arm drive lever 354 is provided with a fan-shaped hole 356.
358, a pin 358 fixed to the tension arm 357 is inserted.

Referring to FIG. 18, boss 359 fixed to tension arm 357 is rotatably supported by shaft 352 via a pair of bearings 360, as shown in FIG. . The preload collar 361 is fixed to an upper portion of the shaft 352, and serves to receive a preload given to the pair of bearings 360 via the boss 355 by a compression spring (not shown) provided at a lower portion of the shaft 352.

Referring to FIG. 17, tension arm 35
7 is connected to the arm drive lever 354 by a tension spring 362, and the pin 358 of the tension arm 357 is connected to the arm drive lever 35 during tape unloading.
4 is in contact with the wall 363 of the fan-shaped hole 356. The tension arm 357 can rotate only within a range where the pin 358 can move in the fan-shaped hole 356 against the urging force of the tension spring 362.

The operation of the tension post drive system during tape loading will be described below. FIG. 20 is a block diagram for explaining the operation of the tension post drive system during tape loading. Referring to FIGS. 17 and 20, first, master cam gear 258 is rotated counterclockwise by the mechanism shown in FIG. As a result, the master cam lever 261 rotates clockwise, and the loading rack 315 slides rightward. While the loading rack 315 slides and the slot 342 moves from the position indicated by 342 to the position indicated by 342 ', the tension relay lever 339 moves from the position indicated by 339 to 339'.
Rotate clockwise to the position indicated by.

Initially, since there is play between the pin 349 of the tension relay lever 339 and the wall 350 of the double action lever 343, the rotation of the tension relay lever 339 is absorbed by the play, and the double action lever 343 does not rotate.

When the elongated hole 342 moves to 342 ", the pin 349 comes into contact with the wall 350, and then the double action lever 343 is kicked by the tension relay lever 339 and rotates clockwise. When the double action lever 343 rotates. , The relay gear 345 is rotated by the urging force of the register mark spring 346, and the arm drive gear 35 meshed with the relay gear 345.
1 rotates counterclockwise by a predetermined angle. Therefore, the driving force of the arm drive gear 351 during tape loading is due to the urging force of the register mark spring 346.

Since the double-acting lever 343 starts rotating after being delayed from the tension relay lever 339, when the tension arm 357 is loaded, the tension arm 357 and the Su pole base 2
This is because the tension arm 357 is started with a delay so that 21 does not interfere.

When the arm drive gear 351 rotates counterclockwise, the arm drive lever 354 also rotates counterclockwise. Then, the tension arm 357 is pulled by the arm drive lever 354 via the tension spring 362 and rotates counterclockwise. On the way, the lower flange 364 (see FIG. 18) of the tension post 233 causes the Su guide pole 2
06 is temporarily displaced against the urging force of the leaf spring 207, and the tension arm 357 passes.

Eventually, the arm drive lever 354 is fixed to the stopper 365 to which the main chassis 201 is fixed downward.
And the loading of the tension arm 357 is completed. Further, since the double-acting lever 343 overruns, the registration mark spring 346 is bent by the movement, and the arm driving lever 354 is pressed against the stopper 365 by the urging force of the registration mark spring 346. At this time, the Su guide pole 206 has already returned to the predetermined position shown in FIG.

In the loading state, the tension arm 357 can rotate only in the fan-shaped hole 356 as described above, ignoring the tension spring 362. When the magnetic tape 219 is run for recording and reproducing on the magnetic tape 219, a predetermined tension is given to the magnetic tape 219 by appropriately controlling the reel DD motor 366.

The predetermined tension and the urging force of the tension spring 362 are balanced, and the pin 358 of the tension arm 357 is
Are arranged substantially at the center of the fan-shaped hole 356. The registration spring 346 has a much larger urging force than the tension spring 362, and the arm drive lever 354 does not separate from the stopper 365 due to the resistance of the predetermined tension. When the tension post 233 pushes the Su guide pole 206 during loading of the tension arm 357, the tension post 23
The tension spring 3 receives the resistance of the Su guide pole 206 and
Even if 62 loses and the rotation of the tension arm 357 is delayed with respect to the arm drive lever 354, the pin 358 is opened by the wall 367 of the fan-shaped hole 356 and the tension arm 3
There is no problem because 57 is rotated.

The operation at the time of unloading the tension arm 357 is the reverse operation. That is, when the loading rack 315 moves toward the unloading position shown in FIG. 17, the tension relay lever 339 rotates counterclockwise, and the double-acting lever 343 rotates counterclockwise through the urging force of the tension spring 344. Direction, the relay gear 345, the arm drive gear 351 and the arm drive lever 3
The tension arm 357 is rotated clockwise through 54, that is, unloaded.

When the elongated hole 342 of the loading rack 315 moves from the position indicated by 342 'to the position indicated by 342 ", the tension arm 357 contacts the stopper 368 provided on the tension chassis 338 to complete the unloading. Then, since the double-acting lever 343 cannot rotate any more, the excessive rotation of the tension relay lever 339 is absorbed by the extension of the tension spring 344. Of course, after the tension arm 357 is unloaded, the Su pole base is released. 221 is unloaded without interfering with the tension arm 357.

A description will be given of the tape tension detecting mechanism. FIG. 21 is a plan view of the tape tension detecting mechanism according to one embodiment of the present invention. Tension detection lever 36
9 is rotatably supported by a boss 359 (see FIG. 18) of a tension arm 357 via a detection lever holder 370. A pin 371 that can contact the tension arm 357 is fixed to one end of the tension detection lever 369, and a V-shaped shielding plate 372 is fixed to the other end downward in a direction perpendicular to the main chassis 201. FIG. 19 shows the shape of the shielding plate 372.

Referring again to FIG. 21, a registration mark spring 373 is hung between the tension detecting lever 369 and the tension arm 357.
69 is urged clockwise. Tension arm 3
57, the tension detection lever 369 is connected to a hole 374 provided in the main chassis 201.
Abuts against the wall 375 of FIG. Immediately before the loading of the tension arm 357 is completed, the tension detection lever 36 is turned off.
9 is in contact with the tension arm 357, and then the tension detection lever 369 is moved to the tension arm 3
It rotates integrally with 57.

The sensor angle 376 fixed to the upper surface of the main chassis 201 has a sensor mounting portion 380 formed on the sensor angle 376 inserted into a hole 374 of the main chassis 201. A sensor substrate 379 (see FIG. 18) to which a sensor (photo interrupter) 377 is fixed with the cutout 378 facing upward is fixed to the sensor mounting portion 380.

When a predetermined tension is applied to the magnetic tape 219 when performing recording or reproduction or the like on the magnetic tape 219, referring to FIG. 19, at the time of tape loading, the shielding plate located at the notch 378 of the sensor 377 is used. 372 is configured to cover approximately half the area of the light receiving window 381 of the sensor 377. That is, in the above state, the output of the sensor 377 is approximately half that of the full output.

The tension servo is performed as follows. If the tape tension increases or decreases for some reason such as disturbance, the tension arm 3
The tension detection lever 369 rotates clockwise and counterclockwise via 57. When the tension detection lever 369 rotates clockwise, the area of the light receiving window 381 increases, and decreases when the tension detection lever 369 rotates counterclockwise. That is, when the tape tension increases, the output of the sensor 377 increases, and when the tape tension decreases, the output decreases. The servo circuit (not shown) controls the Su motor 38 of the reel DD motor 366 so that the output of the sensor 377 is always half of the full output.
2, the tape tension is always controlled to be constant.

Note that the position of the sensor 377 is adjusted as shown in FIG.
1, holes 3 provided in the main chassis 201
A gear 384 having a central shaft fixed thereto is fitted to the gear 83, meshes with a gear 385 formed in the sensor angle 376, and the gear 384 is rotated in an arbitrary direction.

(6) Drawing Post Drive System Next, a drawing post driving system according to an embodiment of the present invention will be described. FIG. 22 is a plan view of one embodiment of the present invention for describing a drawer post drive system of one embodiment of the present invention. FIG. 23 is a plan view of a drawer post drive system according to one embodiment of the present invention. FIG. 24 is a side view thereof. FIG.
The drawer post drive system according to one embodiment of the present invention will be described with reference to FIG.

The drawer post drive rack 386 has a shaft 387 standing upright on the main chassis 201 and a shaft 38 standing upright on the drawer post drive rack 386.
8, the loading rack 315 is supported so as to be reciprocally movable in the same direction as the moving direction of the loading rack 315. For the position of the drawer post drive rack 386 on the main chassis 201, see FIG.

Referring to FIG. 23, locking portion 389 erected downward on drawer post drive rack 386 is inserted into hole 390 provided in loading rack 315, and drawer post drive rack 386 is provided. And the loading rack 315 are connected by a tension spring 391. When the loading rack 315 moves rightward during tape loading, the locking portion 389 of the pull-out post drive rack 386 moves to the wall 3 of the hole 390 of the loading rack 315.
The loading rack 315 and the pull-out post drive rack 386 are pushed by the button 92 and move together. However, in the tape unloading state, the locking portions 389
A play (interval) 393 is formed between the loading rack 315 and the wall 392. When the loading rack 315 starts moving at the time of tape loading, the movement of the loading rack 315 is absorbed by the play 393, and the pull-out post drive is performed. The rack 386 does not move, the loading rack 315 moves a predetermined distance, and the wall 392 is locked by the locking portion 389.
After that, the drawer post drive rack 386 moves integrally with the loading rack 315.

At the time of tape unloading, the pull-out post drive rack 386 is pulled by the loading rack 315 via the biasing force of the tension spring 391 and moves. The drawer post drive rack 386 stops when returning to the position shown in FIG. 23, and thereafter, only the loading rack 315 moves leftward, and play 393 is generated.

During the tape loading, the pull-out post drive rack 386 starts moving later than the loading rack 315 because of the Tu-side pole base 222.
(See FIG. 22) Tape pull-out post 2 described later
This is to prevent the Tu-side guide roller 223 from moving away from the magnetic tape 219 during tape loading because the moving speed at the time of tape loading is high. That is, the tape pull-out post 228 is started with a delay, and the phase at the time of movement between the tape pull-out post 228 and the Tu-side guide roller 223 is made as close as possible.

A rack gear 394 is formed on the drawer post drive rack 386. The pinion gear 395 is rotatably supported by a shaft 396 erected on the main chassis 201 and is engaged with the rack gear 394. The position of the pinion gear 395 is further described in FIG.
Please refer to.

A pin 397 is provided on the pinion gear 395 so as to stand upward. The double-acting lever 398 is rotatably supported by a shaft 396, and the double-acting lever 398 and the pinion gear 395 are urged by a register spring 399, and the engaging portion 4 provided on the double-acting lever 398 by the urging force.
00 is crimped to the pin 397. See also FIG. 24 for the position of the double acting lever 398.

The state of the drawer post drive system shown in FIG. 23 is a tape unloading state. Pull-out post lever 401 with tape pull-out post 228 standing upright
Is rotatably supported by a double-acting lever 398 via a shaft 402 erected on the pull-out post lever 401. See also FIG. 24 for the position of the pullout post lever 401. A tension spring 403 is hung between the pull-out post lever 401 and the double-acting lever 398,
An engaging portion 404 provided on the pull-out post lever 401 is pressed against a contact portion 405 provided on the double-acting lever 398.

In the tape unloading state shown in FIG. 23, the pinion gear 395 is urged counterclockwise by the urging force of the tension spring 391, and the pull-out post lever 401 is pivoted about the shaft 396 via the double-acting lever 398. Energized in the counterclockwise direction, a locking portion 406 formed on the pull-out post lever 401 is pressed against a stopper pin 407 erected on the main chassis 201.

As shown in FIG. 22, a guide 408 is fixed to the upper surface of the main chassis 201 in order to prevent the pull-out post lever 401 from lowering by its own weight during the tape unloading state and halfway through the loading. That is, the extraction post lever 401 is connected to the guide 4
It is supported not to descend by 08.

The operation of the pull-out post lever 401 will be described below. FIG. 25 is a block diagram for explaining the operation of the pull-out post lever drive system during loading. Description will be made mainly with reference to FIGS. 23 and 25.

When the master cam gear 258 (see FIG. 22) rotates counterclockwise by the drive system shown in FIG. 4, the master cam lever 261 (see FIG. 22) rotates clockwise. As a result, the loading rack 315 slides rightward, and the drawer post drive rack 386 slides rightward slightly later. Drawer post drive rack 386
Starts sliding rightward, the pinion gear 395 rotates clockwise. When the pinion gear 395 rotates, the double-acting lever 39
8 and the pull-out post lever 401 rotate clockwise about the shaft 396 integrally.

As the pull-out post lever 401 moves, the shaft 40 erected on the main chassis 201 is eventually formed.
9 (see FIG. 24) is fitted into a V-shape 411 (see FIG. 24) formed on the side surface of the pull-out post guide roller 410 (see FIG. 24) rotatably supported by 9. The draw-out post lever 401 is maintained at a predetermined height by being regulated in the vertical direction by a V-shaped groove 411 (see FIG. 24).
The double-acting lever 398 further rotates clockwise about the shaft 396, but the double-acting lever 398 further rotates clockwise, so that the pull-out post lever 401 rotates about the shaft 402 against the bias of the tension spring 403. And rotate counterclockwise. That is, the distance between the tape pull-out post 228 and the shaft 396 increases.

When the pull-out post 228 moves as described above, the pull-out post lever 401 comes into contact with the pull-out post receiver 412 (see FIG. 22) fixed to the upper surface of the main chassis 201, and the pull-out post receiver 41 is moved.
2 (see FIG. 22)
Pressing plate spring 413 that presses the upper surface of 1 (see FIG. 22)
The draw-out post lever 412 (see FIG. 22) positions the draw-out post lever 401 at a predetermined position in the plane direction of the main chassis 201 and in a direction perpendicular to the plane. The reason why the pull-out post lever 401 follows the above-described path is that the tape pull-out post 228 has the Tu auxiliary tilt guide roller 226 and the Tu auxiliary tilt post 227.
(See FIG. 22). The operation of the pull-out post lever 401 at the time of tape unloading is the reverse of the operation at the time of tape loading.

Here, the unloading sensor (switch) 414 for detecting completion of tape unloading will be described with reference to FIG. The unloading sensor 414 is fixed to the back side of the main chassis 201 via an unloading sensor board 415. Unloading sensor lever 416 is attached to main chassis 2
It is rotatably supported by a shaft 417 erected downward at 01. At the time of tape unloading, immediately before the loading rack 315 returns and the return is completed, the operation lever 418 of the unloading sensor 414 is pushed by the loading rack 315 via the unloading sensor lever 416, and the unloading sensor 414 is turned on. , So that completion of tape unloading can be detected.

(7) Reel system FIG. 26 is a plan view of one embodiment of the present invention for explaining a reel system of one embodiment of the present invention. Su motor 38
Reel DD motor 36 supporting 2 and Tu motor 419
6 is fixed to the back surface of the main chassis 201, and a Su reel base 420 is coaxially fixed to an upper part of the Su motor 382 and a Tu reel base 421 is fixed to an upper part of the Tu motor 419. The Su reel base 420 and the Tu reel base 421 protrude from the upper surface of the main chassis 201, respectively, and are mounted on a cassette 234 loaded by a cassette (not shown). Stand 421
Are configured to fit each other. That is,
The rotation of the Su motor 382 and the Tu motor 419 is directly
The rotation of the Su reel 305 and the Tu reel 306 is controlled by being transmitted to the reel 305 and the Tu reel 306, respectively.

The cassette LED holder 422 erected upward on the main chassis 201 is inserted into the loaded cassette 234, and the light emitted from the cassette LED 423 provided on the cassette LED holder 422 emits light from a cassette (not shown). The magnetic tape 219 is configured to be received by a pair of light receiving elements provided on the left and right sides, and to detect the start and end of the winding of the magnetic tape 219 and the cutting of the tape. Su brake 424 and Tu brake 4
Reference numeral 25 is provided to lock the rotation of each of the Su reel base 420 and the Tu reel base 421. When these rotations are locked, the rotations of the Su reel 305 and the Tu reel 306 are locked. The Su brake 424 is rotatably supported by a shaft 426 erected upward on the main chassis 201, and the urging force of the tension spring 428 is in a direction in which the rubber 427 fixed to the Su brake 424 is pressed against the side surface of the Su reel base 420. Is working but S
The tension spring 430 urges the urging force through the u brake plate 429 in a direction to cancel the urging force. When the Su brake solenoid 431 is not operated, the rubber 427 is separated from the side surface of the Su reel base 420.

Similarly, the Tu brake 425 is rotatably supported by a shaft 432 erected upward on the main chassis 201, and the rubber 433 fixed to the Tu brake 425 is pressed against the side surface of the Tu reel base 421 in the direction of being pressed. The urging force of the tension spring 434 is acting, but the tension spring 436 is urging through the Tu brake plate 435 in a direction to cancel the urging force, and the Tu brake solenoid 4
When the 37 is not operating, the rubber 433 is separated from the side surface of the Tu reel base 421.

The Su brake solenoid 431 is fixed to the main chassis 201 via the Su solenoid angle 438, and when the Su brake solenoid 431 is energized, the urging force of the tension spring 430 of the Su brake plate 429 via the Su connection bar 439. Is erased, so that the rubber 427 is displaced by the urging force of the tension spring 428.
It is crimped to the side surface of the u reel base 420. Similarly, the Tu brake solenoid 437 is a Tu solenoid angle 440.
When the Tu brake solenoid 437 is energized, the Tu connection bar 44 is
1, the tension spring 43 of the Tu brake plate 435
6 removes the urging force, so that the rubber 433 presses against the side surface of the Tu reel base 421 by the urging force of the tension spring 434.

[0136]

According to the magnetic recording / reproducing apparatus of the present invention, the thin magnetic tape can be run stably without damaging it, and thus the signal can be recorded / reproduced on the thin magnetic tape with high accuracy. be able to.

According to the magnetic recording / reproducing apparatus of the present invention, the rotational motion of the master cam gear is converted into the reciprocating motion of the rack. Power transmission to a loading system and a tension post drive system far away from the master cam gear can be performed with a smaller number of parts and space.

According to the third aspect of the present invention, since the transmission gear for transmitting the driving force of the tape loading motor to the rack member also functions as the pinch roller pressing cam, it is necessary to separately provide the pinch roller pressing cam. And the number of parts can be reduced.

According to the magnetic recording / reproducing apparatus of the present invention, the start of the movement of the pole base can be made earlier than the start of the movement of the pull-out post. Loading can be performed in a state of contact.

[Brief description of the drawings]

FIG. 1 is a plan view of a traveling system according to an embodiment of the present invention.

FIG. 2 is a plan view of the embodiment of the present invention for explaining the traveling system of the embodiment of the present invention.

FIG. 3 is a plan view of the embodiment of the present invention for explaining the operation of driving the master cam gear of the embodiment of the present invention.

FIG. 4 is a block diagram of a power transmission mechanism of a master cam gear drive system.

FIG. 5 is a plan view of the embodiment of the present invention for explaining the operation of the master cam gear of the embodiment of the present invention;

FIG. 6 is a plan view of the embodiment of the present invention for explaining the operation of the pinch roller drive system of the embodiment of the present invention;

FIG. 7 is a side view of the embodiment of the present invention for explaining the operation of the pinch roller drive system of the embodiment of the present invention;

FIG. 8 is a sectional view of a pinch roller elevating cam.

FIG. 9 is a plan view of a pinch roller elevating cam.

FIG. 10 is a cam diagram of a cam groove.

FIG. 11 is a diagram illustrating a relationship between a post compression spring and a tape pull-out post.

FIG. 12 is a block diagram illustrating a process until a pinch roller contacts a capstan shaft.

FIG. 13 is a plan view of a loading system in an unloaded state according to an embodiment of the present invention.

FIG. 14 is a side view of a loading system according to an embodiment of the present invention.

FIG. 15 is a plan view of a loading system in a loading state according to an embodiment of the present invention.

FIG. 16 is a block diagram illustrating a transition from an unloading state to a loading state.

FIG. 17 is a plan view of a tension post drive system according to an embodiment of the present invention.

FIG. 18 is a side view of a tension post drive system according to one embodiment of the present invention.

FIG. 19 is an explanatory diagram for explaining the operation of the sensor.

FIG. 20 is a block diagram for explaining the operation of the tension post drive system during tape loading.

FIG. 21 is a plan view of a tape tension detecting mechanism according to one embodiment of the present invention.

FIG. 22 is a plan view of one embodiment of the present invention for describing a pull-out post lever drive system of one embodiment of the present invention.

FIG. 23 is a plan view of a drawer post lever drive system according to an embodiment of the present invention.

FIG. 24 is a side view of the drawer post lever drive system according to one embodiment of the present invention.

FIG. 25 is a block diagram for explaining the operation of the pull-out post lever drive system during loading.

FIG. 26 is a plan view of an embodiment of the present invention for describing a reel system of the embodiment of the present invention;

FIG. 27 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining a drive system of a conventional master cam gear.

FIG. 28 is a block diagram of a driving mechanism of a conventional master cam gear.

FIG. 29 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining the operation of a conventional pole base.

FIG. 30 is a block diagram of a conventional pole base driving mechanism.

FIG. 31 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining the operation of a conventional tension lever.

FIG. 32 is a block diagram illustrating the operation of a conventional tension lever.

FIG. 33 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining the operation of a conventional half load shaft.

FIG. 34 is a block diagram of a conventional half-load shaft drive mechanism.

FIG. 35 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining a driving system of a conventional pinch roller.

FIG. 36 is a block diagram of a driving system of a conventional pinch roller.

FIG. 37 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining a conventional traveling system.

FIG. 38 is a plan view of a traveling system of a conventional magnetic recording / reproducing apparatus.

FIG. 39 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining a conventional tape tension control.

FIG. 40 is a plan view of a conventional magnetic recording / reproducing apparatus for explaining a drive system of a conventional Su, Tu reel base.

FIG. 41 is a block diagram of a drive system of a conventional Su, Tu reel base.

[Explanation of symbols]

 201 Main Chassis 202 Rotating Magnetic Head Drum 258 Master Cam Gear 315 Loading Rack 231 ′ Pinch Roller 221 Su Pole Base 222 Tu Pole Base 228 Tape Pull Out Post 233 ′ Tension Post

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 15/665 630 G11B 15/665 640 G11B 15/10 551

Claims (5)

(57) [Claims] 1. A chassis, a rotating head drum mounted on the chassis, a loading motor mounted on the chassis, and a transmission rotatably mounted on the chassis and transmitting a driving force of the loading motor. A rack member having a gear, a first and a second rack, reciprocally mounted on the chassis, and reciprocating on the chassis by the rotational force of the transmission gear; and rotatably mounted on the chassis. A pinch roller driven by the rotational force of the transmission gear, a loading gear rotatably mounted on the chassis and meshing with the first rack, and a movably mounted on the chassis, and A driven pole base, rotatably mounted on the chassis, and meshing with the second rack; A pull-out post driving gear; a pull-out post lever, the pull-out post lever being rotatably mounted on the chassis and driven by the pull-out post driving gear; and the rack member being rotatably mounted on the chassis. And a tension arm driven by reciprocating movement of the first and second racks, wherein the first and second racks have different timings for starting rotation of the loading gear and starting rotation of the pull-out post drive gear. . 2. A chassis, a rotary head drum mounted on the chassis, a loading motor mounted on the chassis, and a transmission rotatably mounted on the chassis and transmitting a driving force of the loading motor. A gear, a master cam gear rotatably mounted on the chassis, and meshing with the transmission gear; a rack member having first and second racks mounted reciprocally on the chassis; A master cam lever having a master cam follower shaft connected to a rack member and engaged with a cam groove provided in the master cam gear; a pinch roller rotatably mounted on the chassis and driven by a rotational force of the transmission gear; A loading gear rotatably mounted on the chassis and meshing with the first rack; A pole base movably mounted on a chassis and driven by the loading gear; a drawer post drive gear rotatably mounted on the chassis and meshing with the second rack; and a drawer post, A drawer post lever rotatably mounted on a chassis and driven by the drawer post drive gear; anda tension arm rotatably mounted on the chassis and driven by reciprocation of the rack member. The magnetic recording / reproducing apparatus, wherein the first and second racks have different timings for starting rotation of the loading gear and starting rotation of the pull-out post drive gear. 3. A chassis, a rotary head drum mounted on the chassis, a loading motor mounted on the chassis, and a transmission rotatably mounted on the chassis and transmitting a driving force of the loading motor. A rack member having a gear, a first and a second rack, reciprocally mounted on the chassis, and reciprocating on the chassis by the rotational force of the transmission gear; and rotatably mounted on the chassis. A pinch roller driven by the rotational force of the transmission gear; a loading gear rotatably mounted on the chassis and meshing with the first rack; and a loading gear movably mounted on the chassis. A pole base driven by a second rack mounted rotatably on the chassis; A drawer post drive gear that meshes with the drawer post, the drawer post lever being rotatably mounted on the chassis and driven by the drawer post drive gear, the rotatable mount being mounted on the chassis, And a tension arm driven by reciprocating movement of the member, wherein the pinch roller is pressed and separated from the capstan shaft by:
The first and second racks are driven by a cam formed integrally with the transmission gear and a cam follower shaft that engages with the cam. The first and second racks start rotating the loading gear and rotate the pull-out post drive gear. A magnetic recording / reproducing apparatus in which start timings are different. 4. The magnetic recording / reproducing apparatus according to claim 1, wherein the pinch roller is disposed on a non-magnetic surface side of the magnetic tape in a loading state. 5. The mouse of the cassette in which the pull-out post is arranged during unloading is the same as the mouse of the cassette in which the pole base is arranged.
The magnetic recording and reproducing apparatus according to claim 1.