JPH0344391B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and/or reproducing apparatus that performs recording and/or reproducing by pulling out a magnetic tape from a tape cassette and winding it spirally around a tape guide drum.

Currently, efforts are being made to make current home VTRs even more compact without changing the recording pattern on the magnetic tape. One of the ideas for miniaturizing VTRs is to wrap the magnetic tape around the guide drum at approximately 270 degrees, rather than the current approximately 180 degrees, and to install four video heads at 90 degree intervals.
There is an idea to reduce the diameter of the guide drum to 2/3 of the current diameter and reduce the diameter of the guide drum to achieve a smaller VTR. In this case, if a conventional so-called parallel loading method is adopted as the tape loading method, the inclination of the guide drum becomes large, making it difficult to downsize the VTR.

Therefore, if the tape path on the circumferential surface of the guide drum is made to be at the same height as the tape in the tape cassette on the entrance side of the guide drum, and lower than the height of the tape in the tape cassette on the exit side of the guide drum, the guide drum The slope can be kept small, and in this way, the VTR can be made smaller. However, in this VTR, in the tape path where the tape leaves the circumferential surface of the guide drum and returns to the tape cassette, the tape is sequentially attached to an audio erasing head, an audio/control head, etc., and reaches the tape cassette. At some point, it is necessary to guide the tape so that it returns to a tape path along a plane at the same height as the tape in the tape cassette.

The present invention has been made in response to the above-mentioned needs, and one embodiment thereof will be described below with reference to the drawings.

FIG. 1 shows a small tape cassette 1 used by being attached to the magnetic recording and/or reproducing apparatus of the present invention. The small tape cassette 1 is provided with a cassette housing 3 that houses a magnetic tape 2 and can be opened and closed on the front side of the cassette housing 3, and is guided by left and right guide rollers 5, 5 to cross the front surface of the cassette housing 3. It consists of a lid 4 that protects the magnetic tape 2. As shown in FIGS. 2 and 3, this tape cassette 1 has a supply reel hub 6 connected to a supply reel feather 3.
2, the gear portion 7a on the outer circumferential surface of the take-up reel hub 7 meshes with the gear 48a, and the loading pole, capstan 22, etc. It is attached to the magnetic recording and/or reproducing apparatus 10 with the lid 4 completely inserted and with the lid 4 rotated to a horizontal position and opened.

FIG. 2 is a plan view of an embodiment of the magnetic recording and/or reproducing device 10 according to the present invention in stop mode;
FIG. 3 is a side view, and FIG. 14 is a plan view in the recording/reproducing mode.

In each figure, 11 is a tape guide drum, which has a structure in which four video heads (rotating heads) are arranged at 90 degree intervals, and the drum diameter is 2/3 that of the conventional one.
It has a small diameter, and the magnetic tape is wrapped over 270 degrees. The video head operates by sequentially switching the tape attachment angle range as one operation unit,
The same track pattern as the current one is formed on the magnetic tape 2. Further, since the magnetic tape is wound as described later, the guide drum 11 is inclined at only about 6 degrees in the -X axis direction with respect to the vertical axis, and the angle of inclination is small. Therefore, there is almost no increase in the occupied area and height due to the inclination, and the occupied area of the guide drum 11 within the apparatus 10 is much smaller than that of the conventional apparatus, making the apparatus 10 compact.

Furthermore, the guide drum 11 is assembled at a lower position than in the past in relation to the tape winding.
In this relationship, as shown in FIG.
The position may be slightly higher than the top surface of the For this reason,
In this embodiment, the tape cassette 1 is installed in such a position that the opened lid 4 is slightly above the top surface of the guide drum 11 and a portion of the lid 4 covers the top surface of the guide drum 11 in a plan view. Ru. Therefore, since the tape cassette 1 and the guide drum 11 are located in close proximity, the apparatus 10 can be made compact.

The loading motor 12 can rotate in two directions, forward and reverse, and the cam gear 1 performs switching operations and loading and unloading operations in each operation mode via a reduction gear train including an output gear 13.
Rotate 4.

The play bar 16 is provided on the lower surface of the chassis base 15 so as to be slidable in the direction of the arrow A-B.
(see figure). The play bar 16 biases the pinch roller and controls the tension arm, as will be described later.

The pinch roller bar 18 has a rack 18a on the side.
It is slidably provided on the upper surface of the chassis base 15 and connected to the play bar 16 via a compression coil spring 19.

The pinch roller 21 is supported at the tip of the pinch roller arm 20, and a fan-shaped gear 20a on the base side of the arm 20 meshes with the rack 18a.

The relay lever 23 is rotatable on the lower surface of the chassis base 15, and one end is attached to the play bar 1.
6. The other end is connected to a tension arm bar 25.

The tension arm 26 has a tension pole 27 at its tip and a supply reel disk 3 at its base.
The free ends of the brake band 30 surrounding the brake band 1 are connected. This arm 26 is urged to rotate counterclockwise by a spring 29, but when the device 10 is in the stop mode, the pin 28 comes into contact with the left end of the tension arm bar 25 and is restricted to the rotation position shown in FIG. has been done.

The supply reel disk 31 has an outer gear 31a and a brake drum 31b, and is provided with a reel feather 32 on its upper surface.

Next, the capstan drive system and reel disk drive system will be explained with reference mainly to FIG. 4. The capstan motor 33 rotates the flywheel 35 via the belt 34. The intermediate wheel 37 guides the outer surface of the belt 34 to increase the winding angle of the belt 34 around the flywheel 35 and the motor pulley 36. flywheel 35
is flywheel gear 39 and capstan 22
It has both. The flywheel gear 39 serves as a rotational drive source during tape winding, fast forwarding, and rewinding, and is connected to the intermediate gear 4 on the bottom surface of the chassis base.
It meshes with 0.

The reel drive system gear 41 includes a large diameter gear 41a and a small diameter gear 41b. The large diameter gear 41a meshes with the intermediate gear 40, and the small diameter gear 41b faces the winding gear 42 and the unwinding gear 43 at a distance.
Both the winding gear 42 and the unwinding gear 43 have a structure in which upper gears 42a, 43a and lower gears 42b, 43b are disposed coaxially with a friction clutch interposed therebetween. First gear 44 is gear plate 45
It is supported on the lower surface of the gear 41b and faces the small diameter gear 41b and the upper gears 42a and 43a. The take-up gear 46 is supported by the upper surface of the gear arm 47 and is located directly below the first gear 44.
It faces the small diameter gear 41b and the lower gears 42b and 43b.

As shown in FIG. 3, the cassette drive gear 48 includes an upper large-diameter gear 48a, a lower small gear 48b, and a brake drum 48c, and the small gear 48b meshes with the upper gear 42a of the take-up gear 42. are doing. When the tape cassette 1 is installed, the large diameter gear 48a meshes with the gear portion 7a of the take-up reel hub 7 inside the tape cassette.

The lower cam 49 is coaxially fixed to the upper surface of the cam gear 14 as shown in FIG.
It has 9c.

As shown in FIG. 4, the play lever 50 is rotatably provided on the chassis base, and a pin 51 at one end is fitted into the cam groove 49a, and the other end is connected to the play relay lever 53. be. A gear arm 47 is connected to the other end of the play relay lever 53.

The rewind lever 56 is rotatable on the chassis base, and its right end is connected to the play relay lever 53 via a connection lever 57, and its left end supports the gear plate 45.

The transmission gear 59 is the upper gear 4 of the rewinding gear 43.
3a and the gear 31a of the supply reel disk 31 mesh with each other.

Now, the reel disk braking system will be explained with reference to FIG. 4. The brake lever 60 is rotatable on the chassis base, and one end contacts the side surface of the cam 49c (see FIG. 5). , the other end is pin-coupled to one end of a connecting bar 61. The brake lever 62 is slidable in the direction of arrow A-B and has a brake element 63a at one end and a bent piece 62a at the other end.
is formed and biased in the direction of arrow A by a spring 64. The brake relay lever 65 is rotatable on the chassis base, one end is pin-coupled to the connection bar 61 and faces the bent piece 62a of the brake plate 62, and the other end is pin-coupled to another connection bar 66. There is. The brake arm 67 is rotatably provided near the supply reel disk 31, has a brake element 63b at one end, is biased to rotate counterclockwise by a spring 68, and is rotated by a pin 6 at the other end.
9 is inserted into the elongated hole 66a at the left end of the connecting bar 66.

In the stop mode, the brake lever 60 contacts the concave portion of the cam 49c and rotates counterclockwise, and the brake element 63a is connected to the brake drum 48c and the brake element 6.
3b is pressed against the brake drum 31b, and both the cassette drive gear 48 and the supply reel disk 31 are braked.

Next, the head arm system will be explained with reference to FIG. 2. The right head arm 70 is provided on the chassis base so as to be able to rotate in a plane parallel to the chassis base, and the upper surface of the tip is provided with an audio signal that can be heard via the head base. An erasing head 72 and an audio/control signal recording/reproducing head 73 are mounted, and two tape guides 74 are mounted between these heads 72 and 73.
a, 74b are planted. Furthermore, a stopper 75 for a raising/lowering pole, which will be described later, is fixed to the upper surface of the head arm 70. This head arm 70 is urged to rotate counterclockwise by a torsion coil spring 76, and in the stop mode, it rotates counterclockwise as shown in FIG. (see figure), and the head 7
2 and 73 are retreated outside the tape running path.

The left head arm 77 has a full-width erasing head 78 and a tape guide 79 on its upper surface, and is biased clockwise by a torsion coil spring 80.
The impedance roller arm 81 supports an impedance roller 82 on its upper surface, and a pin 83 at the tip fits into a long hole at the tip of the head arm 77. As a result, the head arm 77 and the impedance roller arm 81 are separated from each other by the arm 81.
A portion of the erase head 78 contacts a pin 84 on the chassis base to restrict its rotation as shown in FIG. 2, and the full width erasing head 78 and impedance roller 82 protrude into the tape running path.

Next, the cam structure will be explained with reference to FIG. 5. The cam structure is made up of a cam gear 14, a lower cam 49, a head cam 88, and an upper cam 89 coaxially provided in order from the bottom. It is a structure. A pin 93 at one end of a pawl lever 90 supported by a shaft 91 is fitted into a cam groove 89a on the lower surface of the upper cam 89.

Next, the raising/lowering pole and the related mechanism will be explained with reference to FIG. 6. The raising/lowering pole 85 has a base 85a rotatably held by a shaft 87 of a holding block 86 fixed onto the chassis base 15. Also, the base 8 of the raising pole 85
An arcuate gear 85b having approximately 1/3 circumference is formed at one end of 5a.

Further, a leaf spring 92 is attached to one end of the pole lever 90.
A pin 97 at the tip of the upper pole arm 94 is held between the protrusion 90a of the pole lever 90 and the leaf spring 92. The upper pole arm 94 is fixed to the upper end of a rotation shaft 96 supported by a cylindrical bearing 95 on the chassis base. The lower pole arm 9 is attached to the lower end of the rotation shaft 96.
8 is fixed, and the pole arm 98 rotates integrally with the upper pole arm 94.

The tilting lever 99 is rotatably held by a hanging piece 86a of the holding block 86 by a shaft 100, and a sector-shaped gear 99a at the upper end thereof meshes with the arcuate gear 85b. The lower end of the tilting lever 99 is pin-coupled to the tip of the lower pole arm 98 via a connecting plate 101.

In the stop mode, as shown in FIG. 2, the pawl lever 90 is rotated counterclockwise, and the raising/lowering pawl 85 is tilted at an angle substantially parallel to the chassis base 15.

Next, the loading ball mechanism and related mechanisms will be explained.

FIG. 7 shows the unloading state of the loading pole mechanism. Left side loading pole stand 1
02 holds a supply side loading pole 104A by a vertical shaft 103 on the upper surface, and is further provided with an inclined pole 105 in the vicinity thereof, and is movable along a guide groove 106 formed in the chassis base 15 itself. The guide groove 106 is approximately a circular arc with a radius R ₁ centered on the point O ₁ (see FIG. 2).

As shown in FIG. 8, the right side loading pole stand 107 holds the take-up side loading pole 104B by an upright shaft 108, and has an inclined pole 109 near this, and is fixed to the chassis base and serves as a guide. Guide groove 1 of rail 110
It is possible to move by being guided by 10a.

9 and 10 show the guide rail 110 taken out, and FIG. 11 shows changes in the height of the guide groove 110a of the guide rail 110. The guide rail 110 includes a flat surface portion 110A between P ₀ and _{P 1} (indicated by graph line I in FIG. 11), an inclined surface portion 110C (graph line) between P ₂ and P ₃ , and a flat surface portion 110
It consists of a twisted surface part 110B (graph line) that descends while turning and connects A and an inclined surface part 110C.
The flat surface portion 110A is located at a dimension H higher than the chassis base 15, is a surface parallel to the chassis base 15, and has a cross-sectional shape shown in FIG. The inclined surface portion 110C is a plane inclined at a predetermined angle (approximately downward) in a predetermined direction, and has a cross-sectional shape shown in FIG.
It has reached the bottom of the The guide groove 110a is a circular arc having a radius R ₂ centered approximately on a point O ₂ in a plan view. The radius R ₂ is larger than the radius R ₁ (R ₂ >R ₁ ). Further, in the guide groove 110a, the groove width W ₂ of the twisted surface portion 110B is slightly larger than the groove width W ₁ of the flat surface portion 110A and the inclined surface portion 110C so that the loading pole base 107 can move smoothly. It is said to be wide (W ₂ > W ₁ ). Further, the guide rail 110 is made of, for example, an aluminum alloy main body subjected to surface hardening treatment, or a molded part of polyacetal or the like so that the loading pole stand 107 can slide smoothly.

As shown in FIG. 8, the loading poles 104A and 104B include a rotating roller 104a and fixed collars 104b and 104c for regulating the tape running height.
It becomes more. The loading pole stand 107 has two guide protrusions 107a and 107b on the lower surface fitted into the guide groove 110a, and one guide protrusion 10
It is pressed against the guide rail surface by a leaf spring 111 screwed to 7a, and guided by a guide groove 110a. This configuration is also the same for the loading pole stand 102 on the left side. Further, the guide groove 110a of the guide rail 110
The groove width W ₂ at the torsion surface portion 110B is made sufficiently larger than the diameter of the guide protrusions 107a and 107b (for example, about 0.5 mm), so that the torsion surface portion 110
It is used as an escape when passing B.

Furthermore, a pole stopper 112 is provided at the end of the guide groove 106 to position the loading pole 104A during loading. Similarly, a pole stopper 113 is provided on the chassis base near the end of the guide rail 110 to position the loading pole 104B in an inclined state.

Further, a winding side loading pole 10 is provided below the guide drum 11 on the lower surface of the chassis base 15.
A ring gear 114 for moving the supply-side loading pole 104A and a ring gear 116 for moving the supply-side loading pole 104A are supported by three guide rollers 115 with flanges arranged concentrically above and below on the inner periphery. . Each ring gear 114 and 116 has the same diameter and has a gear on the outer periphery. Ring gear 1
A large diameter gear 129a of a reduction gear 129 is engaged with the gear 14, and a reversing gear 130 is engaged with the reduction gear 129.
The small gear 129b and the ring gear 116 mesh with each other.

A guide piece 117, which is a synthetic resin molded product, is slidably attached to the lower ring gear 116 with its U-shaped cross section sandwiching the plate thickness of the ring gear 114. Ring gear 116 and guide piece 11
A coil spring 118 is stretched between the coil spring 7 and the coil spring 118.
Also, the upright shaft 103 of the loading pole stand 102
The downward extension of the guide piece 117 is the elongated hole 1.
17a is inserted. As a result, the ring gear 116 is connected to the coil spring 118 and the guide piece 117.
It is possible to move the loading pole stand 102 via the.

The upper ring gear 114 has an arc-shaped through hole 114.
b is formed, and one end of the guide plate 119, which is an arc-shaped metal plate, is attached to a caulking pin 120.
It is movably supported by. A pin 121 is installed at the tip of the guide plate 119.
The upper part of the pin 121 passes through the guide groove 110a and connects to the loading pole stand 1 on the guide rail 110.
It is inserted through the circular hole 107c of No. 07. Here,
The loading pole stand 107 is the guide rail 11
The length (height) of the pin 121 is large because the pin 121 moves not only on a plane but also vertically along the 0 axis, and the circular hole 107c has a relatively large diameter compared to the diameter of the pin 121. It is as follows. Further, the base of the guide plate 119 and the ring gear 114 are connected by a coil spring 122.

The loading gear 123 is the ring gear 114
It is usually engaged. Loading arm 124
is rotatable about the shaft 125 of the loading gear 123, and the pin 126 at the tip is fitted into the cam groove 49b of the lower cam 49 (see FIG. 5). A movable gear 127 is located in the middle of the arm 124.
is rotatably supported. As shown in FIG. 3, the movable gear 127 is an upper small diameter gear 12.
7a and a lower large-diameter gear 127b, the large-diameter gear 127b is always in mesh with the loading gear 123, and the small-diameter gear 127a can move toward and away from the cam gear 14. In the stop mode, the loading arm 124 is rotated clockwise, so the small diameter gear 127a is separated from the cam gear 14 and meshes with a fixing rack 128 fixed on the chassis base.

Next, the operation of the magnetic recording/reproducing apparatus 10 having the above configuration will be explained.

FIG. 14 is a plan view of the magnetic recording/playback device 10 in a recording or playback mode following tape loading, and FIG. 15 is a plan view showing the loading pole mechanism taken out after tape loading is completed. FIGS. 16 and 17 are a left side view and a right side view, respectively, showing how the tape is wound around the guide drum in recording or reproducing mode.

When recording or reproducing is performed while the device 10 is in the stop mode shown in FIG. 2, the loading motor 12 starts and the cam structure controls the rotation angle by a rotation angle detection plate (not shown). It then rotates 240 degrees clockwise.

As a result, the play bar 16 slides in the direction of arrow A by the action of the cam groove 14a shown in FIG. The pinch roller 21 is rotated counterclockwise under the action of , and the pinch roller 21 is pressed against the capstan 22 by the spring force of the spring 19 .

Further, due to the above-mentioned sliding of the play bar 16, the tension arm bar 25 moves to the right via the relay lever 23, and the tension arm 26 is released from its restraint and rotates counterclockwise by the action of the spring 29. As a result, the tension pole 27 moves in the direction of the tape running path and the brake band 3
0 comes into contact with the brake drum 31b, and the supply reel disk 31 is lightly braked.

Also, during recording/playback, the capstan motor 33
rotates forward, the flywheel 35 is rotated clockwise, and the magnetic tape is driven and run by the capstan 22 and the pinch roller 21. The flywheel 35 also performs a take-up operation via a flywheel gear 39. That is, in FIG. 4, when the lower cam 49 rotates 240 degrees clockwise, the play lever 50 rotates clockwise, the gear arm 47 moves in the direction of arrow B via the play relay lever 53, and the take-up gear 46 meshes with the small diameter gear 41b of the reel drive gear 41. At this time, the gear 41 is rotated clockwise by the flywheel gear 39 via the intermediate gear 40. Therefore, the take-up gear 46 swings to the right and engages with the lower gear 42b of the take-up gear 42 as shown by the dashed line in FIG. The take-up reel hub 7 rotates clockwise, and the magnetic tape is wound onto the take-up reel.

In addition, in the recording/reproduction mode, as shown in FIG. 4, the brake lever 60 contacts the maximum diameter part of the cam 49c and rotates clockwise, and
The lever 65 rotates clockwise via the lever 65, and the connecting lever 66 moves to the left. The above rotation of the lever 65 causes the brake plate 62 to slide in the direction of arrow B, and the action of the connecting bar 66 causes the brake arm 67 to rotate clockwise, causing the cassette drive gear 4 to rotate.
8 and the supply reel disk 31 are released.

Further, as the head cam 88 rotates, the head arm 70 is pushed by the cam and rotates clockwise.
Eventually, the cam comes into contact with the maximum diameter part of the cam, and the audio erasing head 72 and the audio/control head 73 move to the tape running path.

Furthermore, the rotation of the upper cam 89 causes the pawl lever 90 to rotate clockwise. pole lever 9
0 rotates, the pin 97 is pushed by the leaf spring 92, the upper pole arm 94 and the lower pole arm 98 both rotate counterclockwise, and the connecting plate 101
Through the raising/lowering lever 99, the raising/lowering pole 85 is raised approximately 70 degrees as shown by the two-dot chain line in FIG. The raising/lowering pole 85 enters inside the tape path that is being formed and guides the magnetic tape 2. The head arm 70 is raised substantially parallel to the raising operation of the raising and lowering pole 85.
rotates clockwise as described above, and the tip end 85c of the raising pole 85 collides with and is received by the protruding part 75b of the raising pole stopper 75. Groove 75a
relatively guided within. The raising/lowering pole 85 is rotationally biased in the upright direction by the action of the leaf spring 92.
As a result, the tip 85c of the tilting pole 85 is not only fitted into the groove 75a of the stopper 75, but also elastically pressed against one side wall 75c of the groove 75a, and the tilting pole 85 is When the tape runs, the tape receives a force in the direction of falling due to the action of the tape tension, but this action prevents it from falling down unnecessarily.
It is accurately and stably locked in a predetermined standing position. Note that the other side wall 75d of the groove 75a prevents the tip portion 85 from falling when a large force is applied to the tipping pole 85 in the direction of falling due to an impact, for example.
It has the function of restricting rotation in the direction of falling by catching c.

Further, as shown in FIG. 15, when the lower cam 49 rotates, the loading arm 124 rotates counterclockwise due to the action of the cam groove 49b, and the movable gear 1
27 approaches the cam gear 14, and the small diameter gear 127a
meshes with the cam gear 14. As a result, the upper ring gear 114 rotates counterclockwise via the large-diameter gear 127b of the movable gear 127 and the loading gear 123, and furthermore, the
30, the lower ring gear 116 rotates clockwise at a slower speed than the upper gear 114. The reason why the rotational speeds of both ring gears 114 and 116 are changed is that when the supply side loading pole 104A and the take-up side loading pole 104B have different moving distances during tape loading, each rotation speed is changed. This is to ensure that the movement of loading poles 104A, 104B starts and ends at the same time, and the speeds of both ring gears 114 and 116 are such that the speed ratio of each loading pole 104A is
and 104B so as to substantially correspond to the ratio of the moving distances.

When the lower ring gear 116 rotates clockwise, the loading pole stand 102 moves along the guide groove 106 of the chassis base 15, and the head arm 77 and impedance roller arm 81 are moved along the guide groove 106 of the chassis base 15.
While temporarily pushing it away as shown by the two-dot chain line in FIG. 14, it moves to the position shown in FIG. 15 without changing its height. Looking at the loading pole 104A, the loading pole 104A is
As shown in FIG. 16, the tape is moved on the tape running height surface (reference surface) S in the loaded tape cassette 1 to a position slightly beyond the left side of the guide drum 11 without changing its height. (approximately _one rotation of angle α),
It is pressed and locked to the pole stopper 112 by the spring force of the coil spring 118 (see FIG. 7).

When the upper ring gear 114 rotates counterclockwise, the loading pole stand 107 is locked to the pin 121 and is inserted into the guide groove 110 of the guide rail 110.
Along a, flat surface portion 110A→twisted surface portion 110
It moves from B to the inclined surface portion 110C. When the loading pole stand 107 moves on the bent torsion surface part 110B, the loading pole stand 107 becomes inclined with respect to the upper surface of the guide rail 110, making it difficult to pass.
Regarding B, since the groove width of the guide groove 110a is set to _W2 as described above, the loading pole stand 107 moves smoothly even at the torsion surface portion 110B. Regarding the loading pole 104B, as shown in FIG. 17, the loading pole 104B moves vertically on the reference plane S without changing its height until it reaches the right side of the guide drum 11. Then, the tape cassette 1 is tilted and displaced downward, further moving approximately 90 degrees along the circumferential surface of the guide drum 11, and being rotated as a whole by an angle α ₂ (>α ₁ ) in the plan view. It reaches a position on the opposite side and is pressed and locked to the pole stopper 113 by the spring force of the coil spring 122.

As a result, the magnetic tape 2 is attached to the inclined pole 10.
5 and the inclined pole 109 over an angular range somewhat larger than 270 degrees. Also, tape 2 is tape cassette 1.
This means that the tape is unattached to the guide drum 2 at a position approximately on the back side of the tape cassette 1, that is, at a position as far away as possible from the tape cassette 1, and the length of the tape along the tape path from this tape attachment release position to the take-up reel is It becomes possible to take a long time. However, even if the tape cassette 1 and the guide drum 11 are disposed close to each other, the length of the tape that reaches the audio/control head 73 due to the above-mentioned tape splicing release position cannot be increased by making the tape path into a complicated shape. Even without a skein, the value determined by the standard will be reached, and the equipment 10
is also compatible with standard equipment in this respect.

Further, the loading poles 104A and 104B start moving at the same time as described above, move different distances at speeds corresponding to the distances, and arrive at the loading position at the same time. Thereby, the winding of the tape around the guide drum 11 is performed at the same rate of progress on the supply side and the winding side, and ends at the same timing.

In the loading state, the supply side loading pole 104A is perpendicular to the chassis base as in the unloading state, but the take-up side loading pole 104B is inclined at a predetermined angle with respect to the chassis base. Furthermore, the tilt angle of the winding-side tilt pole 109 is larger than that during unloading.

In addition, since the end portion of the cam groove 49b of the lower cam 49 is a large diameter portion, the rotation of the lower cam 49 reaches the final stage of 220 degrees (pause mode position).
When the movable gear 127 moves in the direction of arrow B, the small diameter gear 127a moves away from the cam gear 14 and meshes with the fixed rack 128, and the ring gear 114,
116 is locked to prevent reverse rotation, and the loading poles 104A, 104B are held pressed against the pole stoppers 112, 113 during the pause mode and recording/reproduction mode.

In addition, the small diameter gear 127a has a lower cam 49 of 220
Because it separates from the cam gear 14 when rotated,
The remaining 20 degrees of cam gear 14 are ring gear 114,
116 will be rotated independently without further rotation. Here, cam gear 14 is ring gear 1.
14 and 116 while rotating the remaining 20 degrees, the cam gear 14 is rotated by the coil springs 188 and 116.
122 is further pulled and rotated,
The rotational load on the cam gear 14, ie, the load on the motor 12, becomes considerably large, which is undesirable. In this embodiment, the cam gear 14 is connected to the ring gear 11 at the last 20 degrees.
4, 116 is not loaded, the load on the motor 12 is not increased, and the apparatus is smoothly put into recording and/or playback mode, and also smoothly switched to pause mode if necessary.

Next, the states of the members that determine the tape running path during tape loading and their respective functions will be explained in more detail.

FIG. 18 is a view seen from the Y-axis side in FIG. 14, showing the positions and inclinations of the poles around the guide drum 11 in the tape loading state. Same figure,
In FIGS. 16 and 17, a line 131 is the center line (generating line) of the tape 2.

First, the tension pole 27 shown in FIG.
The tape guide 79, the full width erasing head 78, the impedance roller 82, and the supply side loading pole 104A all have tape guide surfaces perpendicular to the chassis base, that is, perpendicular to the tape running surface in the tape cassette. The running path from the tape to the supply side loading pole 104A is a tape running path on the reference plane S, as shown in FIGS. 16 and 18.

The next inclined pole 105 is inclined in the same direction as the guide drum 11 at an angle equal to the recording track angle (approximately 6 degrees), so that the tape travels through the inclined pole 105 and enters the guide drum 11 (point A
-B) is downward. Since the guide drum 11 is inclined at 6 degrees with respect to the vertical axis, the magnetic tape 2 follows a tape running path (point B- C-D-E-F). The inclined pole 109 on the exit side is the guide drum 11
It is tilted 29 degrees in the same direction as , so the tape running path from this point onwards (between points FG and G) changes upward.
The winding side loading pole 104B is reached. The height of the tape running path at the location of the winding side loading pole 104B is the same as that of the supply side loading pole 104.
It is approximately 10mm lower than the tape running path around A. This winding side loading pole 104
B is inclined at 25 degrees in a predetermined direction, and the tape running path after this point is a tape running path (between points G and H) that faces obliquely upward with respect to the horizontal plane, and the tape height position is restored. . The position where the height of the tape running path reaches the reference plane S and the tape height is restored (point H)
Then, the tape 2 is guided to the tilting pole 85. The tilting pole 85 is inclined at about 20 degrees with respect to the vertical axis, and the tape 2 is guided by the tilting pole 85 so as to be perpendicular to the chassis base 15 and along the reference plane S. From now on tape 2
The tape guide 74, the audio erase head 72, the audio/control head 73, and the tape guide 7
4. The tape reaches the inside of the tape cassette 1 via the capstan 22 and the pinch roller 21.

As described above, the tape running path height regulation function is performed by the loading poles 104A and 104B, and the tape running direction conversion function is performed by the tilting poles 105, 109 and the tilting pole 85. .

Now, regarding the pole on the tape exit side with respect to the guide drum 11, which has a large inclination angle, the winding side loading pole 104B is inclined at about 25 degrees with respect to the vertical axis, but the inclination angle with respect to the tape is 0 degrees, and there is no problem even if the rotating roller 104a rotates in accordance with the tape running. The tilt pole 109 is also tilted at a large angle of approximately 29 degrees with respect to the vertical axis, but when tape loading is completed, the tape enters from an oblique direction, so the tilt angle with respect to the tape remains at 20 degrees or less, which is relatively small. The angle becomes In general, when the inclination angle of the pole for changing the tape running direction with respect to the tape is large, the difference between the entrance angle and exit angle of the tape to the pole becomes large, and the tape is twisted by that amount on the circumferential surface of the pole, which increases the tape running load. This causes a problem in stabilizing tape running. Moreover, the error in the tilt angle will greatly affect the tape exit angle.
Pole requires a high level of precision. In this embodiment, the inclination of the inclined pole 109 with respect to the tape is relatively small, and the above-mentioned problem does not occur. Also, the inclination of the loading pole 104B is restored during tape unloading, and the loading pole 1
04B is vertical, and the inclination of the inclination pole 109 is also restored to the same extent, reducing the inclination angle. For this reason, the winding side loading pole 104B and the inclined pole 10
9 can be stored in the concave portion 3b of the tape cassette 1 without any problem.

Furthermore, since the tape 2 is attached to the circumferential surface of the guide drum 11 at a position lower than the reference surface S, the height h of the guide drum 11 from the reference surface S to the top surface is made smaller than in the conventional case. It is attached. For this reason, the height of the top surface of the guide drum 11 is lower than the lower surface of the open lid 4 of the tape cassette 1 with which the tape cassette 1 is attached. They are mounted in an overlapping position very close to the guide drum 11.

Further, as the tape 2 runs along the above-mentioned tape path and runs along the circumferential surface of the guide drum 11, signals are recorded or reproduced.

FIG. 19 shows an operation chart of each part relative to the cam rotation angle. Loading pole 104A, 10
4B has a long moving distance, so as shown in FIG. 4(A), it starts its operation early and finishes its operation relatively late. When the cam rotates approximately 210 degrees, the loading poles 104A and 104B become locked to the pole stoppers 112 and 113, respectively, and depending on the subsequent rotation of the cam, the loading pole 1
04A and 104B do not move. That is, the apparatus of the embodiment can be switched to either the recording and/or playback mode or the pause mode while the loading poles 104A, 104B are maintained in their final positions. Since the raising/lowering pole 85 must perform the raising operation after passing the winding side loading pole 104B, the raising operation start time is late and the raising/lowering end time is determined in relation to the head arm 70, as shown in FIG. . As shown in the same figure (C), the head arm 70 starts rotating late in order to avoid collision with the loading pole stand 107 on the winding side, and also ends its rotation at the tip of the raising pole 85.
The raising/lowering pole 85 once erected is further guided by the raising/lowering pole stopper 75 to the final position at a slightly slower rate. Since the pinch roller 21 is located behind the head arm 70 in the stop mode, the pinch roller 21 starts later than when the head arm 70 starts rotating, as shown in FIG. Since it is only a matter of time, the operation end position is also the latest. Since the movement locus of the tension arm 26 intersects with the supply side loading pole 104A, the rotation start timing is delayed as shown in FIG. Because the tape is collected into the cassette during the tape unloading operation on the supply reel side, the take-up gear 46 remains in the operating position until the end of the tape unloading operation, as shown in FIG. 19(F). However, in the pose position (220 degrees) it becomes temporarily inactive. FIG. 4(G) shows an operation chart of the first gear 44. The brake lever 67 and the brake plate 62 are as shown in FIG.
It operates at the same time as the gears 46 and 44 to release the brake.

Note that if a pause operation is performed during recording and/or playback mode, the loading motor 12 reverses, and the cam gear 14, lower cam 49, head cam 88, and upper cam 89 all rotate counterclockwise by 20 degrees. The pause mode is entered, but at this time the pinch roller 21 is removed from the crimping position as shown in FIG. 19D, and the take-up gear 46 is also temporarily disengaged as shown in FIG. The drive stops, but the status of other parts remains the same as during recording and playback.

When a stop operation is performed during recording and/or playback mode, the loading motor 12 is reversed and the cam gear 14, lower part 49, head cam 88, and upper cam 89 are rotated.
All of them rotate 240 degrees counterclockwise, and each part follows a path opposite to the above operation chart to return to its original state in the stop mode. In particular, the take-up gear 46 remains engaged until 20 degrees before the cam rotation stop position, but when a stop operation is performed, the capstan motor 33 is reversed by a motor control circuit (not shown). As a result, the take-up gear 46 meshes with the lower gear 43b of the rewind gear and is connected to the supply reel disk gear 3 via the friction felt (not shown), the upper gear 43a, and the transmission gear 59.
Rotate 1a counterclockwise. As a result, the tape drawn out of the tape cassette 1 by the left and right loading poles 104A, 104B and forming the tape running path is wound around the supply reel hub 6 and collected into the tape cassette 1. Here, since the loading pole 104B changes height and tilts during the tape unloading operation, the tape is more likely to come off the loading pole than when the loading pole remains vertical and moves horizontally. If the tape loosens even a little, it will come off the loading pole. However, in this embodiment, the tape winding operation during tape recovery is performed via a friction felt slip mechanism, and tension corresponding to the slip torque continues to be applied to the tape as it is being pulled back into the tape cassette 1. The tape remains locked to the loading pole 104B without falling off the loading pole 104B until the loading pole 104B returns to its original position, and the tape unloading operation is performed. .

Further, when fast forwarding or rewinding is performed while the device 10 is in the stop mode, the loading motor 12 is rotated in reverse to drive the cam gear 14 and the lower cam 4.
9. The head cam 88 and the upper cam 89 rotate 45 degrees counterclockwise, and the capstan motor 33 rotates in the same direction as during recording/reproduction during fast forwarding and in the opposite direction during rewinding.

Therefore, during fast forwarding, the play lever 50 rotates counterclockwise under the action of the cam groove 49a in FIG. The rewind lever 56 rotates counterclockwise, and the gear plate 45 moves in the direction of arrow B. As a result, the first gear 44 on the gear plate 45 meshes with the small diameter gear 41b of the reel drive gear 41. At this time, since the reel drive gear 41 is rotating clockwise, the first gear 44 swings to the right as shown by the dashed line in the figure, and also meshes with the upper gear 42a of the take-up gear. As a result, the rotation of the first gear 44 is transmitted to the cassette drive gear 48 via the upper gear 42a (without passing through the slip clutch), and the rotation of the first gear 44 is transmitted to the cassette drive gear 48 via the upper gear 42a (without passing through the slip clutch).
rotates and the magnetic tape 2 is fast-forwarded.

During rewinding, the play lever 50 and associated levers operate in the same manner as described above, with the capstan motor 33 rotating in reverse and the reel drive gear 41 rotating counterclockwise. Therefore, the first gear 44 swings to the left, and the upper gear 43a of the rewinding gear 43 moves as shown by the two-dot chain line in FIG.
mesh with. As a result, the rotation of the first gear 44 is transmitted to the supply reel disk 31 via the upper gear 43a and the transmission gear 59 without passing through the slip clutch in the rewind gear 43, and the supply reel disk 31 is rotated, and the magnetic tape 2 is rotated. It is rewound.

The first gear 44 is shown in FIG. 19 (G).
As shown in (H) in the same figure, the operation state follows after the brakes on the cassette drive gear 48 and the supply reel disk 31 are released (see (H) in the same figure).

Further, the rotation of the cam gear 14, the cam groove 49b of the lower cam, the head cam 88, and the upper cam 89 in the above-mentioned fast forward or rewind mode does not perform any cam action, and the corresponding members do not operate and are in the stop mode. stay in position.

As described above, the magnetic recording and/or reproducing apparatus according to the present invention has the following features.

Since the guide pole is provided, it is possible to separate the detached magnetic tape from the tape guide drum due to its attachment to the tape guide drum, and to return the height of the magnetic tape to the tape height in the tape cassette. Tape winding can be performed with the tape height on the exit side of the tape guide drum being lower than the tape running height within the tape cassette.

Since the guide pole does not move together with the loading member, it is no longer necessary to insert the guide pole into the front recess of the tape cassette in the tape unloading state. This makes it practically possible.

Since the movement of the guide pole to the operating state and the operation of locking it are performed in conjunction with the movement of the loading member, the guide pole does not interfere with the movement of the loading member.
Furthermore, after the magnetic tape is pulled out of the tape cassette by the loading member, the guide pole can reliably guide the magnetic tape.

The guide pole 85 is configured to rotate and stand up around a fixed fulcrum on the board, and is configured to be locked by being latched at the tip, so the position of the guide pole is the same as the final position of the loading member. becomes irrelevant, and even if there is an error in the final position of the loading member, the guide pole can be positioned with high accuracy. Thereby, the tape path can be formed with high precision after loading, and the tape can be run stably.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an example of a small tape cassette 1 installed in the device shown in FIG. 2, and FIG. 2 is a plane view showing the state in stop mode of an example of the magnetic recording/reproducing device according to the present invention. Figure 3 is a side view of the device shown in Figure 2, Figure 4 is a plan view showing the reel drive system of the device shown in Figure 2, and Figure 5 is an exploded view of the cam structure in Figure 2. 6 is a side view showing the relationship between the tilting pole and the cam structure in FIG. 2, and FIG. 7 is a plan view showing the tape loading mechanism of the device shown in FIG. 2 taken out. 8 are side views showing the loading pole on the winding side and related mechanisms, and FIGS. 9 and 10 are plan views showing guide rails for guiding the movement of the loading pole stand on the winding side, respectively. and a perspective view, Figure 11 is a diagram showing changes in the height of the guide rail, Figures 12 and 13.
The figures are a cross-sectional view along X-X,
FIG. 4 is a plan view showing the state of the device of the present invention when tape loading is completed (in recording or playback mode);
Figure 15 is a diagram showing the tape loading mechanism extracted from Figure 14, Figures 16, 17, and 1.
Figure 8 shows a left side view, a right side view, and a view seen from the direction of arrow -Y, respectively, showing the tape being wound around the guide drum when tape loading is completed, and Figures 19A to 19H show various parts of the apparatus of the present invention. FIG. 3 is a diagram showing the timing of operations, etc. in correspondence with each other. 1...Small tape cassette, 2...Magnetic tape, 3
...Cassette housing, 4...Lid, 5...Guide roller, 6
...Supply reel hub, 7...Take-up reel hub, 10...
Magnetic recording and/or reproducing device, 11... tape guide drum, 12... loading motor, 13... output gear, 14... cam gear, 15... chassis base,
16... Play bar, 18... Pinch roller bar, 1
8a...Rack, 19...Compression coil spring, 20...Pinch roller arm, 20a...Sector gear, 21...Pinch roller, 23...Relay lever, 25...Tension arm bar, 26...Tension arm, 27...
Tension pole, 30...Brake band, 31
...Supply reel disk, 31a...Outer peripheral gear, 31
b...Brake drum, 33...Capstan motor, 3
5...Flywheel, 36...Motor pulley, 37
...Intermediate wheel, 39...Flywheel gear, 4
0... Intermediate gear, 41... Reel drive gear, 42... Winding gear, 43... Rewinding gear, 44... First gear, 45... Gear plate, 46... Take-up gear, 47... Gear arm, 48... Cassette drive gear, 48a... Large diameter gear, 48b...Small diameter gear, 48
c...Brake drum, 49...Lower cam, 49a, 49
b...Cam groove, 49c...Cam, 50...Play lever, 53...Play relay lever, 57, 66...Connection bar, 59...Transmission gear, 60...Brake lever,
61... Connection bar, 62... Brake plate, 63
a, 63b...brake element, 65...brake relay lever, 67...brake arm, 70...right side head arm, 72...audio erasure head, 73...audio/control head, 74a, 74b...tape guide, 75...stopper, 75a...circle arcuate groove, 75b
...Protruding portion, 75c, 75d...Side wall, 76...Torsion coil spring, 77...Left side head arm, 78...Full width erasing head, 79...Tape guide, 81...Impedance roller arm, 82...Impedance roller, 85... Lifting pole, 85a ...Base, 85b
...Circular gear, 85c...Tip, 86...Holding block, 88...Head cam, 89...Upper cam, 89a
...Cam groove, 90...Pall lever, 92,111...
Leaf spring, 94... Upper pole arm, 95... Bearing,
96... Rotation axis, 98... Lower pole arm, 99... Lifting lever, 101... Connection plate, 102... Left side loading pole stand, 103... Upright axis, 104A, 1
04B...Loading pole, 105,109...
Inclined pole, 106, 110a...guide groove, 10
7...Right side loading pole stand, 107a, 10
7b... Guide protrusion, 107c... Circular hole, 110... Guide rail, 110A... Flat surface portion, 110B... Twisted surface portion, 110C... Inclined surface portion, 112, 113...
Pole stopper, 114...Ring gear, 114b
...Circular through hole, 115...Guide roller, 116...
Ring gear, 117...Guide piece, 117a...
Elongated hole, 119...Guide plate, 120...Caulking pin, 123...Loading gear, 124...Loading arm, 127...Movable gear, 128...Fixing rack, 129...Reduction gear, 130...Reversing gear, 131...Center of tape Line (bus line).

Claims (1)

[Claims] 1. A pair of magnetic tape loading members 104
A, 105, 104B, and 109 pull out the tape from the tape cassette, guide it to the tape inlet side and outlet side of the tape guide drum 11 fixed to the base plate 15, respectively, and insert the tape into the tape guide drum in the tape running direction. On the other hand, in a magnetic recording and/or playback device that performs recording and/or playback by winding the tape in a spiral manner in which the exit side is lower than the tape running surface in the tape cassette, the tape is lowered from the exit side of the tape guide drum in the tape running direction. It is provided at a position on the downstream side so as to be able to rotate and stand up about a fixed fulcrum 87 on the board 15, and is in a non-operating state where it is tilted at an angle substantially parallel to the board 15 before the tape loading operation. a guide pole 85 that rotates upright to be in operation and guides the magnetic tape on the downstream side to change the tape running direction so as to follow the tape running surface in the tape cassette; and tape loading. Before operation, the locking mechanism 75 is in a non-operating position where it is evacuated from the tape running path, and moves to an operating position to receive the tip of the raised guide pole and lock the guide pole in the operating state.
In connection with the movement of the loading member, the guide pole 85 is rotated about the fixed fulcrum 87 to stand up from the non-operating state to become the operating state, and the locking mechanism 75 is moved from the non-operating state to the operating state. Mechanisms 89, 89a, 9 for moving to operating position
1. A magnetic recording and/or reproducing device characterized by comprising: 0, 101, 88.