JP2523784B2 - Magnetic recording / reproducing device tape recording device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a magnetic recording / reproducing apparatus such as a video tape recorder (VTR), and more particularly to a tape loading apparatus suitable for simplifying the apparatus and reducing its size and weight.

[Conventional technology]

As a method of guiding a tape loading tape guide of a magnetic recording / reproducing apparatus such as a VTR along a predetermined guide path, for example, a T-shaped rail (guide body) such as the apparatus described in JP-A-57-133558. ) And a tape guide having a C-shaped holding portion that engages with the rail. In the case of a device in which the running guide is finally arranged three-dimensionally, the tape guide avoids interference with the tape guide group (for example, fixed head, height regulation guide, rotary drum, etc.) arranged on the chassis, It is necessary to move along a complicated path such as straight movement, rotation, and diagonal movement. To cope with this complicated movement path, the authors make the shape of the engaging portion of the tape guide that engages with the rail into an arc and engage the plurality of arc-shaped engaging portions with the rail with a slight clearance. I applied for a tape loading device. However, if it is attempted to make the moving path of the tape guide compact for the purpose of reducing the size and weight of the mechanism, the rail will be made of plastic and have a compact shape. The rail has a limit in terms of rigidity by that amount, and if the tape guide is overloaded, the rail will deform and interfere with the tape guide and running guides such as the rotating drum during loading, stopping the operation of the mechanism, There was a problem such as damage to the driving guide.

Although the rail and the tape guide engage with each other with a slight clearance, the tape guide is positioned at the catcher at the final loading completion position of the tape guide, etc. The clearance between the rail and the tape guide is increased because it must be in this state. for that reason,
Immediately before the completion of loading, the tape guide was pulled by the back tension of the tape and greatly tilted, and there were problems that the tape guide contacted the rotary drum and damaged the rotary drum and the head, and did not enter the catcher. Also, in the cassette loading mode, the tape guide is tilted to the outside of the cassette due to the posture and clearance of the device, the tape is not loaded in a predetermined position, and the tape is pulled out in that state, and the mechanical operation stops. was there.

On the contrary, when the rail is formed by a plurality of circular arcs when the clearance is small, the circular arc having a small curvature cannot be associated with the circular arc having a large curvature, and there is a possibility that the tape guide may be twisted or immovable.

[Problems to be solved by the invention]

In the above-mentioned conventional technique, the attitude control of the tape guide by the rail is not sufficiently considered just before the completion of the loading and at the time of mounting the tape, and there is a problem that the mechanical operation is defective.

SUMMARY OF THE INVENTION It is an object of the present invention to realize a tape loading device having a simple structure that always maintains the attitude of the tape guide in the entire section from the cassette mounting to the loading completion.

[Means for solving problems]

The above object can be achieved by providing a clearance between the tape guide and the rail just before the completion of loading and at the time of mounting the tape, and providing a wall integrally with the rail for preventing the tape guide from tilting toward the rotary drum.

[Action]

At the position immediately before the completion of the loading operation, the clearance between the tape guide and the rail is somewhat large, but if the wall that prevents the tape guide from tilting toward the tape guide drum is provided, it will not contact the tape guide and the tape guide drum. .

In the cassette loading mode, the clearance between the tape guide and the rail is equal to the clearance during loading, but if a wall is installed to prevent the tape guide from tilting away from the cassette, the tape guide will separate from the cassette due to the posture of the device. Since the tape guide is not used, the tape guide is securely stored in the cassette.

〔Example〕

Hereinafter, an embodiment of the present invention and FIGS. 1 to 15 will be described.

FIG. 1 is a plan view of a magnetic recording / reproducing apparatus using a tape loading apparatus according to the present invention, where 1 is a chassis, 2 is a tape guide drum on which a magnetic head is mounted, 3 is a supply reel 4 and a take-up reel 5. A cassette containing a tape 6 to be rotated, 7 a capstan to which a motor 9 is directly connected to the lower end, 8 a pinch roller, 10 an erasing head for erasing the entire width of the tape 6, 11 an audio at the upper and lower ends of the tape 6. An audio head and a control head for recording and reproducing signals and control signals. Cassette 3
When is attached to the apparatus, the lid 12 on the front surface of the cassette 3 is opened.
Furthermore, in the opening 13, the tension pin 16 and the guide roller 1
7 and the inclined pin 18 are inserted, the guide roller 19 and the inclined pin 20 are inserted in the opening 14, and the inclined pin 21 and the capstan 7 are inserted in the opening 15 at the positions shown by the broken line and the solid line, respectively. It At this time, the pinch roller 8 is also at the position shown by the broken line. When the loading operation is performed, each guide moves while pulling out the tape 6. The guide roller 17 and the inclined pin 18 move horizontally as a pair and are positioned near the tape guide drum 2. The guide roller 19 and the inclined pin 29 form a pair and move horizontally to the vicinity of the audio head and the control head 11 and thereafter move obliquely downward to be positioned near the tape guide drum 2 and positioned on the tape guide drum 2. Wind 6 around 270 °.
The tilt pin 21 moves horizontally from the back of the tilt pin 20 and is fixed to the upstream side of the audio head and the control head 11, corrects the posture of the tape 6 and guides it to the take-up reel 5. As a result, the tape 6 comes out of the cassette 3 and the tension pin
16, the impedance roller 22, the erasing head 10, the guide roller 17, and the inclined pin 18, and the spiral winding around the tape guide drum 2 at a predetermined angle, and the guide roller 19, the inclined pin 20, the inclined pin 21, and the fixed guide 23, After passing through the audio head and control head 11, the height regulation guide 24, and the fixed guide 25, the capstan 7 and the pinch roller 8 are pressed and driven to reach the take-up reel 5. FIG. 2 (a) shows a side view after completion of loading, and FIG. 2 (b) shows a side view after completion of unloading. In FIG. 2 (a), reference numeral 26 is a guide base in which the guide roller 17 and the inclined pin 18 are planted and positioned and held by the catcher 28, and 27 is also a guide base in which the guide roller 19 and the inclined guide 20 are planted. And similarly positioned by the catcher 28. As shown in the figure, the tape guide on the output side of the tape guide drum 2 descends largely by the tape width as compared with the input side. As a result, the tape guide drum 2 can be arranged under the lid 12 that opens in front of the cassette 3 by reducing the inclination angle of the tape guide drum 2 and arranging the tape guide drum 2 at a position slightly lower than the cassette 3. We are trying to make it smaller and thinner.

Next, the loading mechanism will be described in detail. FIG. 3 shows the guide moving member on the delivery side. As shown in the figure, the guide base 27 for arranging the guide roller 19 and the inclined pin 20 is connected to the connecting plate 29 with a large backlash, and the connecting plate 29 also has a large backlash to one end of the exit side drive member 31. Supported. The outlet drive member 31 has an arc shape, and a gear portion 31a is provided on the outer periphery thereof. FIG. 4 shows the guide moving member on the entry side. The guide base 26 on which the guide roller 17 and the inclined pin 18 are planted is rotatably supported on one end of the entry side drive member 33 in a plane. The entry-side drive member also has an arc shape, and a gear portion 33a is provided on the outer periphery thereof. FIG. 5 shows the cam 34. The cam 34 is composed of two upper and lower stages, the upper part has a gear part 34a and a cam part 34d from the right side, and the lower part has a stopper surface corresponding to a Geneva gear (described later).
34b, cam part 34c corresponding to the mode operation after loading,
There is a cam portion 34f corresponding to the middle of loading or unloading, and a cam portion 34e corresponding to the mode operation after unloading, and has a circular arc shape as a whole.
These are the input drive member 33, the output drive member 31, and the cam 34 from the top.
Are arranged concentrically on the chassis in this order.

FIG. 6 is a perspective view showing a guide member 68 of the tape guide group and a method of supporting the guide base 27 on the output side by the guide member 68. The guide member 68 has a T-shaped cross section, and the claw portions 27a and 27b of the guide base 27 engage so as to hold the T-shaped portion, thereby restricting the movement path of the guide base 27.
As shown in FIG. 14, the moving path of the guide base 26 on the entry side is the wall of the shaft member and the guide member 78 below the guide roller 17.
78a is also restricted by the engagement of the end surface 26a of the guide base 26 and the wall 79a of the guide member 79. Guide member 6
As shown in FIG. 1, when the guide base 27 on the outlet side is stored in the opening 14 of the cassette, that is, at a position facing the claw portion 27a of the guide base 27 in the cassette mounting mode, as shown in FIG. A wall 68a as shown in FIG. 7 is provided with a slight clearance with the claw portion 27a of the guide base. By providing the wall 68a, even if the posture of the apparatus is tilted when the cassette is mounted and the guide base 27 tries to fall in the direction A shown in FIG. 7, the wall 68a and the claw portion 27a of the guide base contact each other. The gap 1 between the guide roller 19 and the tape 6 can be maintained at a predetermined amount. The position of the tape 6 shown in FIG. 7 corresponds to the broken line state of the tape 6 shown in FIG.

FIG. 8 is a top view of the guide base 27 immediately before the completion of loading. Guide base when loading is completed
Since 27 is positioned by the catcher 28, the guide member 68 and the claw portion 27a of the guide base 27 are not restrained from each other and must be kept free. Therefore, the width n of the guide member 68 is smaller than the width m of the guide member 68 during loading. Immediately before the completion of loading, the width of the guide member 68 is small, and the tape guide 27 is biased toward the tape guide drum 2 in the direction of FIG. 8B due to the back tension of the tape 6, the posture of the apparatus, and the like. However, as in the cassette loading mode described above, by providing the wall 68b of the guide member 68 as shown in FIG. 8, the guide base 27 is prevented from falling over the tape guide drum 2, and the guide roller 19 and the tape guide are prevented. The contact with the drum 2 is prevented. When the loading is completed, the wall 68b of the guide member 68 and the claw portion 27a of the guide base 27 do not come into contact with each other. In this embodiment, the case of the tape guide on the exit side is shown, but the same applies to the tape guide on the entrance side.

FIG. 9 shows the upper stage of the cam 34 and the drive system. (A) shows unloading, (b) shows loading or unloading, and (c) shows loading. Cam 34
Is driven by a gear 35 driven by a drive source (not shown) meshing with a gear portion 34a. When the cam 34 rotates, the gear 36 meshing with the gear portion 34a rotates, and the output side driving member 31 rotates integrally with the gear 38 via the gears 37 and 38 via a crimping spring (not shown). The gear 39 is driven by meshing with the gear portion 31a. Similarly, the entry side drive member 33 passes through the gears 40 and 41, and a compression spring (not shown).
The gear 77 shown in FIG. 1 which incorporates a gear is driven by being engaged with the gear portion 33a. Loading is completed (c)
In this state, the rotation of the gear 36 is stopped by the Geneva gear described later, and the engagement between the gear 36 and the gear portion 34 is released. On the other hand, in the state of (b) during loading, the tip of the cam 34 and the arm 42 are engaged, the arm 42 rotates about the shaft 43, and the arm 44 rotates about the shaft 45. Since the arm 44 is engaged with the shaft 49 of the arm 48 by the arm 46 via the shaft 47, the pinch roller 8 pivotally supported by the arm 48 is provided.
To the loading position. Since the arm 48 is biased in the direction of arrow A by the spring, the cam 34 and the arm are
In the state of (a) where 42 is not engaged, the pinch roller 8 is retracted to the unloading position. When the cam 34 further rotates from the state of (b) to the state of (c), the arm 42 engages with the cam portion 34d, and the pinch roller 8 is moved to the capstan 7 by the toggle mechanism formed by the arms 44 and 46. Crimp. The shaft 45 is erected on the arm 51 supported by the shaft 52, and the arm 51 is always pulled by the spring 53 and its position is regulated by the stopper 54. Therefore, the arm 42 rotates even after the movement of the pinch roller 8 is stopped. By doing so, the arm 51 moves away from the stopper 54 against the spring 53, so that the crimping force between the pinch roller and the capstan is secured.

FIG. 10 shows the lower stage of the cam 34 and the mode operating mechanism (a).
Shows unloading, (b) shows a loading / unloading process, and (c) shows a loading state. 36
Reference symbol a denotes a Geneva gear unit provided integrally with the gear 36. One end of the arm 55 is engaged with the cam portion 34c or 34e, and is biased counterclockwise around the shaft 56 by the spring 57 attached to one end. A brake member 58 is attached to the other end of the arm 55, and applies a braking force to the supply reel base 59. Arm 60
Is a spring attached to one end that engages the cam portion 34c or 34e
61 is urged clockwise about the shaft 62. The arm 63 has an arm 63a engageable with the shaft 60a on the arm 60, and a spring 65 is attached to one end of the arm 63 and is biased counterclockwise around the shaft 62. Further, a brake member 64 is mounted on the other end, and applies a braking force to the drive disk 66 engaged with the take-up reel 5. (A) shows a stopped state after unloading, in which the arm 55 is engaged with the concave portion of the cam portion 34e and a braking force is applied to the supply reel table 59. At this time, since the concave portion and the arm 55 are not directly engaged with each other, the braking force is determined only by the force of the spring 57 and is stable regardless of the stroke of the cam portion 34c. Further, the arm 60 engages with the convex portion of the cam portion 34e, and the spring 61
Against the shaft 60a and the arm 63a, the spring 65a
The braking force is applied to the drive disc 66 by the biasing force of the
In the state of (b), the arms 55 and 60 are engaged with the cam portion 34f, and only the braking force applied to the supply reel base 59 is released. Therefore, at the time of loading, the tape 6 is basically delivered from the supply reel side. The state (c) shows the recording / reproducing state, and the braking force is applied to the supply reel base 59, but the arm 60 is engaged with the concave portion of the cam portion 34c and rotated by the pulling force of the spring 61 to rotate the shaft 60a. Engages the arm 63a and causes the arm 63 to spring 65.
The brake force to the drive disk 66 is released by rotating the drive disk 66 against the drive disk 66. At this time, the Geneva gear portion 36a and the stopper surface 34b are engaged with each other, whereby the rotation of the gear 36 is stopped and the drive member is stopped.
While 31 and 33 stop, the crimping force of each tape guide group to the positioning member is maintained. By transmitting the movement of the cam 34 to the drive member via a switching mechanism such as a Geneva gear, it is possible to easily cope with an increase in the number of operation modes.

FIG. 11 shows the above-mentioned three driving members 31 and 33 and a cam.
It shows the movement of 34, and when (a) is ejected, (e)
Indicates that loading is completed, and (f) indicates that a mode operation such as recording or reproduction is being performed. Each member is shown in an arc shape in a simplified form. As shown in FIG. 9, with respect to the movement of the cam 34, the entrance side drive member 33 rotates in the opposite direction at substantially the same degree, and the exit side drive member 31 rotates in the same direction at almost double speed.

FIG. 12 is a perspective view of the catcher 28. The tape guide drum 2 has an integral structure for positioning the tape guide groups on the entrance side and the exit side. Regarding the tape guide group on the entrance side, the shaft above the guide roller 17 shown in FIG.
Positioning is performed by the groove 28a, and the lower part is regulated by the U groove 28b to prevent the guide roller 17 from falling in a direction perpendicular to the approach direction. The height of the guide roller 17 is regulated by the upper end of the guide base 27 contacting the stopper surface 28c. The inclination of the inclined pin 18 is determined by the side surface of the guide base 27 being in contact with the wall 28d. The same applies to the tape guide group on the exit side,
The position and angle of the guide roller 19 are determined by the V groove 28e and the U groove 28f, and the height is determined by the stopper surface 28g. Also tilt pin 20
Is regulated by the wall 28h. Further, a notch 28i is provided between the V groove 28e and the U groove 28f of the catcher 28.
In the unloading state shown in FIG.
One end of the cam 34 and one end of the output side driving member
However, since these members escape from the cutout portion 28i by the loading operation, the guide roller 19 and the inclined pin 20 can be held at predetermined positions when the loading is completed.

FIG. 13 shows a moving mechanism of the inclined pin 21 arranged on the exit side. FIG. 13 (a) shows a state corresponding to the unloading state shown in FIG. 10 (a). The gear 69, which is rotatably supported coaxially with the arm 48, has a bent portion of the gear 69 at both ends thereof.
69b and the left end 48a of the arm 48 are biased by the spring 70, and the right end 48b of the arm 48 and the bent portion 69c of the gear 69 are in contact with each other. From this state, the 13th corresponding to FIG. 10 (c)
When the mode shifts to the state shown in FIG. 7B and the arm 48 rotates so that the pinch roller 8 comes into pressure contact with the capstan 7,
The arm 72 having the gear portion 72a that meshes with the gear portion 69a of the gear 69 rotates, and the inclined pin 21 planted at the tip of the arm 72 is positioned by the catcher 73 at a predetermined position. After positioning
Further, as the arm 48 further rotates, the arm 48 opposes the spring 70 and bends 69c of the gear 69 as shown in FIG. 13 (b).
The contact force of the inclined pin 21 to the catcher 73 is secured by moving away from the. In addition, at the above timing, the tilt pin
By driving 21, the tilt pin 21 is
It is loaded from the rear of 27. That is, the inclined pin
21 and the guide base 27 partially overlap with each other, the cam 34 and the arm 42 are engaged with each other when the guide base 27 precedes and passes through the overlapping portion, so that the inclined pin 21 is moved.
The position of the arm 42 and the reduction ratio of the arm 72 drive system are set so as to drive the. Therefore, the movement of the cam 34 causes the arm 72 to move.
Since it controls the movement of the above, there is no interference at the overlap portion.

As described above, the loading mechanism and the mode operation in this apparatus are performed by the entrance side driving member 33, the exit side driving member 31, the cam.
It is performed around 34. FIG. 14 is a perspective view showing an assembling structure of the above-mentioned three arc-shaped members. The cam 34 is rotatably guided on the chassis 1 by the engagement of the guide pins 74a to 74e planted on the chassis 1 and the grooves 34g formed on the entire lower circumference of the cam 34. Guide pins 74a-74e are number 12
In the range of rotation of the cam 34 shown in the figure, three or more are always arranged to engage with the groove 34g of the cam 34.
The delivery side drive member 31 is rotatably sandwiched between the cams 34 by the guide pins 76a and 76b, and the guide pins 76a and 76b and the delivery side drive member elongated holes 31b and 31c are also planted in the lower portion of the delivery side drive member 31. The upright pin 30 and the elongated hole portion 34h of the cam 34 are engaged with each other, so that the pin 30 can rotate concentrically with the cam 34. The entry side drive member 33 has a small turning angle as shown in FIG. 11, and gears 75 and 77 are always meshed and held on the outer periphery with the entry side drive member gear portion 33a. The delivery side drive member 31 and the cam 34 rotate in the same direction over an angle of about 180 degrees or more, as shown in FIG. Therefore, as shown in FIG. 14, by replacing the cam that substitutes the substrate that holds the rotation of the delivery side drive member 31, the elongated holes 31b, 31 formed in the delivery side drive member 31.
The angle of c can be the difference between the relative rotation angles of the output drive member 31 and the cam 34. That is, according to the present embodiment, the angle of the oblong hole can be reduced as compared with the case where the ring that rotates 180 degrees or more conventionally is held on the substrate, as compared with the case where the oblong hole of the ring requires 180 degrees or more. , Ring play, strength, etc. can be minimized.
Guide members 78, 79, 81 by screws 88, 89.80, 82 respectively
It is screwed to the chassis 1 to suppress the vertical play of the cam 34. Further, the holder 83 is interposed between the entrance side drive member 33 and the exit side drive member 31, and the integrally formed boss 83a engages with the long groove portion 33b of the entrance side drive member 33 to hold the entrance side drive member 33. , And is screwed to the chassis 1 with screws 84. The holder 85 is screwed to the chassis 1 with a screw 86 to suppress the play of the entry side drive member 33 in the vertical direction.

The entrance drive member 33 having a small rotation angle is always guided by the boss 83a of the holder 83, and rotates on the holder 83. In the output side drive member 31, the holder 83 and the end portion 31d of the output side drive member 31 may not engage with each other in the sections (b) and (c) of FIG. Out-loading drive member after unloading
When the end portion 31d of 31 and the holder 83 are engaged with each other, as shown in FIG. 15, even if the end portion 31d is slightly bent or warped, the holder 83 is provided with a tapered surface 83b. Since it has, the exit side drive member 31 is surely guided to the lower side of the holder 83. The end portions 31d, 31e of the outlet side drive member 31 engaging with the holder 83 are made larger than the diameter of the gear portion 31a, and the gear portions 33a of the inlet side and outlet side drive members 33, 31 having the same diameter, 31a so as not to engage the tapered surface 83b of the holder 83, the drive member 33 on the inlet side and the outlet side,
The size of the device is being reduced by minimizing the 31 intervals. Further, as shown in FIG. 2A, when the loading is completed, the holder 83 is engaged with the end portion 31e of the delivery side drive member 31,
The guide base 27 receives a reaction force when the guide base 27 presses against the catcher 28 to prevent the output side drive member 31 from rising.

〔The invention's effect〕

According to the present invention, 1) the tape guide can be reliably stored in the cassette when the cassette is mounted.

2) The posture of the tape guide can be stably maintained up to the loading completion position.

3) The above effect can be realized in a compact space without adding the number of parts.

Therefore, it is possible to easily improve the reliability of the device and reduce the size and weight of the mechanism.

[Brief description of drawings]

FIG. 1 is a top view showing an embodiment of the tape loading device of the present invention, FIG. 2 is a side view of the device, and FIGS.
FIG. 6 is a perspective view of the guide member, FIG. 6 is a perspective view of the guide member, FIG. 7 is a sectional view of the guide base and the guide member, FIG. 8 is the same top view, and FIG. 9 is a top view of the pinch roller crimping mechanism. FIG. 10 is a top view of the brake operating portion, FIG. 11 is a model view showing the rotational phase of the triple ring, FIG. 12 is a perspective view of the catcher, and FIG.
FIG. 13 is a top view of the inclined pin crimping mechanism portion, FIG. 14 is an assembled perspective view showing a component structure of the loading device, and FIG. 15 is a side view of the holder portion. 2 …… Tape guide drum 6 …… Tape 19 …… Guide roller 27 …… Guide base 68 …… Guide member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuya Shigemura 1410 Inada, Katsuta City, Ibaraki Prefecture, Tokai Plant, Hitachi, Ltd. (56) References JP-A-60-125913 (JP, A) JP-A Sho 57-133558 (JP, A) JP-A-59-101063 (JP, A) JP-A-60-13348 (JP, A)

Claims (3)

(57) [Claims] 1. A tape guide which moves along the periphery of a tape guide drum and has a C-shaped holding portion on its side surface, and a tape guide rail which is included in the holding portion of the tape guide and guides the tape guide. At the tape guide C
A magnetic recording / reproducing apparatus, characterized in that a guide member which is in contact with the character-shaped holding portion and prevents left and right shake in the tape guide traveling direction is provided integrally with the tape guide rail over the moving range of the tape guide. Tape loading device. 2. The tape guide wraps the tape around the tape guide drum at a predetermined angle, and the tape guide is brought into contact with the C-shaped holding portion of the tape guide at a position immediately before the completion of loading in which the tape guide contacts the tape guide positioning member. 2. The tape loading device of the magnetic recording / reproducing apparatus according to claim 1, wherein a wall is provided to prevent the guide from swinging and tilting toward the tape guide drum side. 3. A tape guide having a wall for contacting with a C-shaped holding portion of the tape guide when the tape cassette is mounted and preventing the tape guide from swinging and tilting away from the cassette. The tape loading device of the magnetic recording / reproducing apparatus according to claim 1, wherein the tape loading device is provided integrally with the rail.