JPH0719415B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for drawing a magnetic tape from a cassette to form a predetermined traveling path, and more specifically, a magnetic tape drawn out from the cassette for rotating magnetic field. The present invention relates to a tape guide mechanism for a magnetic recording / reproducing apparatus that is attached to a head or another magnetic head. 2. Description of the Related Art In a magnetic recording / reproducing apparatus such as a video cassette recorder, when a cassette containing a magnetic tape is attached to the apparatus, a predetermined tape path is formed at the time of recording or reproducing operation. A part of the tape guide is moved to pull out the magnetic tape from the cassette, and the magnetic tape is attached to a rotating magnetic head, a fixed magnetic head or the like. In order to pull out this magnetic tape from the cassette to form a predetermined tape path (hereinafter referred to as tape loading operation), a mechanism for moving a part of the tape guide and a space therefor are necessary. Along with the demand for miniaturization of the magnetic recording / reproducing apparatus, it is desired that the mechanism for moving a part of the tape guide and the like also meet the demand for miniaturization. As an example of a structure that meets such requirements, there is JP-A-58-169363. In this example, it is fixed during recording or playback operation,
That is, the fixed magnetic head, which originally does not need to be moved, is moved along with the loading operation. By doing so, a part of the moving path of the tape guide for pulling out the magnetic tape can be overlapped with the fixed magnetic head, and the size of the apparatus is reduced. However, in this example, the magnetic tape is attached to the rotary magnetic head device in the range of about 180 °, and there is room for further downsizing of the device. Further, it is conceivable to reduce the diameter of the rotary magnetic head for further miniaturization so that the range of the magnetic tape attachment angle is significantly larger than 180 ° (for example, 270 °). Even in this case, the same recording pattern as in the case of 180 ° winding can be obtained on the magnetic tape in consideration of the rotation speed of the rotary head and the arrangement of the rotary magnetic head, and the rotary magnetic head device can be compact. As a result, downsizing of the entire device becomes possible. Japanese Patent Laid-Open No. 60-18848 discloses an example of miniaturization of the entire device based on this kind of idea. As shown in this example, in the tape running path, in addition to the inclined tape guides located on both sides of the rotating cylinder after the tape is loaded, the inclined pins that guide the non-magnetic surface side of the tape after the tape is loaded If one is provided on the winding side, a smaller traveling path can be formed. However, in this example, in the state before the tape is pulled out, the additional tilted pin is in a state of being tilted substantially parallel to the chassis, and operates in conjunction with the pulling-out of the tape to move the taper over the tilted pin. After the inclined tape guide and the tape have passed, the inclined pin is raised and moved to a predetermined position in the tape traveling path. Therefore, in this example, it is necessary to obtain the angular accuracy of the inclined pin position, which is mechanically difficult, and it is also difficult to obtain the angular position accuracy. Therefore, there is a demand for an effective method for moving the additional tilt pin, which is more reliable and more accurate in terms of operation timing and position angle accuracy. SUMMARY OF THE INVENTION It is an object of the present invention to perform a magnetic operation in which a third tilt guide pin added to form a small tape traveling path can be reliably and accurately positioned. It is to provide a recording / reproducing apparatus. In order to achieve the object, the present invention provides a third tape guide pin on a guide pin arm which is inclined with respect to the bottom surface of a cassette. The third tape guide pin is located at the third position in the cassette in the unloading state where the tape is not pulled out, and the tape is pulled out from the cassette in accordance with the loading operation, and the third cylinder guide pin of the rotary cylinder on the predetermined tape running path is moved. The tape is moved to the fourth position on the winding side, and during this movement, the third tape guide pin keeps the inclination with respect to the bottom surface of the cassette and moves to the third position in the cassette.
To move from position 4 to position 4. The guide pin arm is driven by a drive arm member using a cam mechanism, and performs an operation satisfying a predetermined operation locus. The third tape guide pin has an inclination with respect to the bottom surface of the mounted cassette, and is provided on the guide pin arm. While maintaining the inclination with respect to the bottom surface of the cassette, the third tape guide pin is moved to the third position in the cassette. To the fourth position. Thereby, the movement is performed while maintaining the inclination with respect to the bottom surface of the cassette, so that it is possible to easily ensure the angular accuracy. Further, since the arm is driven by the cam mechanism, the mechanism can be made compact. FIG. 1 shows a mechanism in the vicinity of a rotary magnetic head device of a magnetic recording / reproducing apparatus according to an embodiment of the present invention. FIG. 2 shows the back surface of the main part of FIG. FIG. 3 is a plan view of essential parts showing a state in which the tape loading operation of the apparatus shown in FIG. 1 is completed. FIG. 4 shows an example of the shapes of the guide roller block for pulling out the tape and guiding the tape and the parts of the drive mechanism thereof from three directions. 5 to 8 are plan views showing examples of the shapes of main parts used in one embodiment of the present invention. FIG. 9 is a sectional view showing the arrangement of the guide pin arms. FIG. 10 shows an example of holding means for the audio control head. An embodiment of the present invention will be described with reference to the drawings shown in FIGS. FIG. 1 shows a portion of a magnetic recording / reproducing apparatus in which a cassette is mounted, a rotary magnetic head device and its peripheral portion as an arrangement of main parts. The schematic shape of the cassette 1 containing the magnetic tape is shown by a chain double-dashed line, and details are omitted. The tape 2 in the cassette 1 is in the position shown in FIG. 1 when the cassette 1 is mounted in the apparatus.
When the tape loading operation is performed, the tape 2
Two guide roller blocks 3 and 4 each having rollers 3a and 4a and inclined pins 3b and 4b, an inclined pin 5a fixed to the guide pin arm 5 and a tension correction pin 6b fixed to the T arm 6 are provided. By moving from the position in the cassette 1 to reach the predetermined tape running state position, the running path form as shown in FIG. 3 is obtained. At this time, the tape 2 includes a full width erasing head 7, an impedance roller 8, a rotating cylinder 9, a guide 10, an audio controller head (hereinafter referred to as an AC head) 11, a guide 1.
2 are attached to each. And the pinch roller 1 shown in FIG.
When the tape 3 is pressed against the rotating capstan 14, the tape 2 sandwiched between the tapes 3 is driven, and the tape 2 is in a steady running state. Here, the full-width erasing head 7 erases the recording signal of the entire width of the magnetic tape passing therethrough during the recording operation. The impedance roller 8 is a roller for stabilizing the running state of the tape, and is a roller rotated by the movement of the tape. The rotary cylinder 9 constitutes a rotary magnetic head device, and is usually arranged concentrically so as to face a fixed cylinder, and a plurality of magnetic fields are formed by slightly protruding the tips on the peripheral surface of the portion facing the fixed cylinder. A head (not shown) is arranged on the magnetic tape 2
Forming diagonally parallel recording tracks. The AC head 11 is a composite head in which two magnetic heads forming an audio signal track and a control signal track in the longitudinal direction are integrated at the end of the magnetic tape 2. Each of these parts has basically the same structure as a known cassette video recorder of the VHS system, for example. The guide roller blocks 3 and 4 are provided with a guide hole 15a provided in the chassis 15 and a guide hole 16a (guide hole 16a) of a guide 16 screwed to the chassis 15.
The portion of the chassis 15 below a is a guide hole. ) And the guide holes 15
It is held slidably along a or the guide 16a. The T-arm 6 is rotatably held about a width 6a and has a pin 6b at one end that contacts the tape. The full width erasing head 7 is attached to the FE head arm 17, and the FE head arm 17 is rotatably held by a shaft 18 fixed to the chassis 15 by a spring (not shown) biased to the position shown. During the tape loading operation, the movement of the guide roller block 3 causes the periphery of the FE head arm 17 to come into contact with the guide roller block 3 and escape against the biasing force of the spring.
The movement of the guide roller block 3 is not blocked. The impedance roller 8 is rotatably held by a shaft 59 fixed to the chassis 15. Rotating cylinder 9
Is a positioning stopper 1 for the guide roller blocks 3 and 4.
It is attached to a C base 19 having 9a and 19b, and the C base 19 is fixed to the chassis 15 by three screws. The guide pin arm 5 is an inclined pin 5a having an inclination with respect to the bottom surface of the mounted cassette shown in FIG.
Is rotatably held on the shaft 20 fixed to the chassis 15, and further has a pin 5b. The stopper 21 is fixed to the chassis 15 with a screw and is in a position to receive the pin 5b as shown in FIG. The guides 10 and 12 are held on the AC head arm 22. The AC head 11 is held on the AC head arm 22 so that the position and posture thereof can be adjusted by a small amount. The AC head arm 22 is rotatably held by a shaft 23 fixed to the chassis 15, and is provided with a spring 2
4 (FIG. 10) is pushed up along the axis of the shaft 23, and is stopped by a nut 26 via a thrust bearing 25. The drive arm 27 is rotatably held so as to overlap the rotation shaft 20 of the guide pin arm 5.
A cam groove 27a (FIGS. 5 and 8) that engages with the pin 22a (FIG. 10) of the AC head arm 22, a spring portion 27b (FIG. 8) that pushes the guide pin arm 5, a leaf spring 27c (FIG. 8), a cam groove. 27d (FIG. 8) and the stopper portion 27e that engages with the stopper piece 5c (FIGS. 5 and 7) of the guide pin arm 5.
(FIG. 8). In FIG. 3, the operation arm 28 is rotatably held by the chassis 15 by the shaft 52, and is engaged with the leaf spring 27c of the drive arm 27 and the cam groove 27d (FIG. 8) of the pin 28a (FIG. 5). , FIG. 6) and the pin 28 engaging with the hole 29a of the operation arm 29 (FIGS. 2 and 5).
b (FIG. 6). As shown in FIG. 2, the operation arm 29 is rotatably held on the back surface of the chassis 15 by a shaft 30 fixed to the chassis 15, and has a cam gear 31.
It also has a pin 29b that engages with the cam groove 31a. The cam gear 31 is rotatably held by a shaft 32 fixed to the chassis 15. Further, as shown in FIG. 4B, the cam gear 31 is rotatably coaxial with the shaft 32.
And a link 34 that is held by the spring 33 and is urged to rotate in one direction by a spring 33. The link 35 is connected to the link 34, and the shaft 35 is connected to the link 35.
The links 37 connected by 6 are connected to each other, and the link 37 has a plate 38 (FIG. 4A) which is held by two shafts with "play". The outer circumference of the cam gear 31 is a gear, and a cam gear 39 having the same structure as the gear is engaged. The cam gear 39 has a spring 40, links 41, 42,
The shaft 43 and the link 44 are arranged in series.
However, there is no equivalent to the plate 38 (see FIG. 4).
(C)). The plate 38 is a guide roller block 4
And the link 44 is connected to the guide roller block 3 in a hole and shaft relationship, respectively. Shaft 43 is guide hole 1
5a, and the shaft 36 is regulated by the guide hole 16a. A worm gear 46 is engaged with the cam gear 39 as shown in FIG. 2, and the worm gear 46 is rotatably held by the chassis 15.
It has a gear 46a. The gear 46a is meshed with the gear portion of the pulley gear 47, the rubber belt 48 is hung on the pulley portion of the pulley gear 47, and the rotational force of the DC motor 49 is transmitted in continuation with the pulley portion of the DC motor 49.
In FIG. 1, the delivery reel base 50 and the take-up reel allowance 51 are rotatably held by the chassis 15. Next, the operation will be described. When the cassette 1 is mounted (FIG. 1) and the DC motor 49 (FIG. 2) is energized in the loading direction, its rotation is the gum belt 48, pulley gear 47, worm gear 46, cam gears 39, 31.
Is transmitted to. As the cam gears 31, 39 rotate, the links 34, 35, 37, 41, 4 connected to them are connected.
The guide roller blocks 3 and 4, which are engaged with each other by 2 and 44 (FIG. 4B), are positioned by the guide holes 15a and 16b while being positioned by the positioning portions 19a and 19 of the C base 19.
b (FIG. 1). The operation arm 29 engaged with the cam groove 31a of the cam gear 31 (FIG. 2) is rotated considerably by the cam gear 31, so that the guide roller block 4
When (FIG. 1) is about to pass the side of the AC head 11, as shown in FIG. 2, the cam groove is displaced to rotate about the shaft 30 in the direction of arrow A (FIG. 5). By this rotation of the operation arm 29, the hole 29 of the operation arm 29 is formed.
The pin 28b engaging with a is operated, and the operation arm 28 starts to rotate about the shaft 52 in the same direction. Along with this, the pin 28a of the operation arm 28 and the cam groove 27d,
The drive arm 27 engaged with the leaf spring 27c starts to rotate in the direction B opposite to the arrow A. At this time, the operation arm 29 pushes the pin 28b of the operation arm 28, the pin 28a pushes the cam groove 27d of the drive arm 27, and the above-mentioned turning force is transmitted. When the drive arm 27 rotates, first, the guide pin arm 5 is pushed by the spring portion 27b and starts to rotate in the direction of the arrow B, and when the inclined pin 5a passes through the front surface portion of the AC head 11 (FIG. 1). Become a cam groove 2
7a (FIG. 5) starts pushing the pin 22a (FIG. 10) of the engaged AC head arm 22, and the AC head arm 22 (FIG. 1) on which the guide 10, the AC head 11, and the guide 12 are mounted. Starts turning. At this time, the tilt pin 5a
Moves while pulling out the tape as the guide pin arm 5 rotates while maintaining the inclination of the guide pin arm 5 at the position inside the cassette relative to the cassette bottom where the guide pin arm 5 rotates parallel to the cassette bottom. The time difference of this operation is obtained by the shape of the cam groove 27a. As the above operation progresses, the guide roller blocks 3 and 4 (FIG. 1) pull out the tape 2, and the positioning portions 19a and 19b (FIG. 1) of the C base 19 are attached to the rotary cylinder 9 while being attached thereto.
At this point, the springs 33, 40 (FIG. 4 (B)) are bent, and the guide roller blocks 3, 4 are moved to the positioning portions 19a,
Press contact with 19b (FIG. 1). At about this time, the pivoting operations of the guide pin arm 5 and the AC head arm 22 also come to an end. First, the pin 5b of the guide pin arm 5
Hits the stopper 21 to stop the rotation, the drive arm 27 spring portion 27b (FIGS. 5 and 8) starts to bend, and then the AC
The head arm 22 (FIG. 3) hits the pin 5b, and the rotation is stopped by sandwiching the pin 5b. When the AC head arm 22 stops, the pin 28a (Figs. 3 and 5) of the operation arm 28 further moves while bending the leaf spring 27c, and at this point, the DC motor 49 (Fig. 2) stops rotating. It At this time, the tape 2 is pulled out to a predetermined traveling position as shown in FIG. 3, and each tape guide member is also stably held at the predetermined position. At this time, when the guide pin arm 5 completes the rotation operation and is held at a predetermined position, the tilt pin 5a is
Although it is held at a predetermined traveling position, the inclination with respect to the bottom surface of the cassette is maintained during movement, so that the angle does not change and angular accuracy is easily ensured, and highly accurate positioning is possible. After that, the pinch roller 13 (FIG. 1) sandwiches the tape 2 and press-bonds it to the capstan 14, and when the capstan 14 rotates, the tape 2 runs steadily. The operation of storing the tape 2 in the cassette 1 is different from the loading operation described above by energizing the DC motor 49 so as to rotate in the unloading direction opposite to the above description. It makes the opposite movement and reaches the starting position. In this case, the tape of the length pulled out from the cassette is stored in the cassette by rotating the feeding reel table 50 or the take-up reel table 51 and winding the tape. In the present embodiment, the AC head 1 is moved along with the turning operation of the guide pin arm 5 having the inclined pin 5a.
Although 1 is also moving, it goes without saying that a mechanism for operating the guide pin arm 5 having the inclined pin 5a without moving the AC head 11 is also possible. Further, in this embodiment, the guide pin arm 5 having the inclined pin 5a is rotated, but the inclined pin 5
Since it is easy to ensure the angular accuracy by moving while maintaining the inclination of a with respect to the bottom surface of the cassette, it is possible to ensure the accuracy with a mechanism (for example, a slide mechanism) that moves in a plane parallel to the bottom surface of the cassette. Become. Therefore, according to the present invention, the third inclined guide other than the guides on both sides of the rotary cylinder, which is necessary for the tape running system when the tape must be wound around the rotary cylinder at a large angle. The position of the stopper in the mechanism that raises the angle when rising like the conventional example because it moves while maintaining the inclination with respect to the bottom surface of the mounted cassette to move it from the inside of the cassette to the predetermined position. However, if there is no problem of variation in the contact angle, and if the accuracy is ensured with a single component, the angle accuracy of the inclination can be easily obtained, and a highly accurate traveling system can be ensured. Further, since the third inclined guide moves while pulling out the tape, unlike the conventional example, there is no need for the difficult timing of raising the third guide after the tape has passed by the loading operation of the tape. Therefore, there is a great effect that there is a degree of freedom in design mechanically and a mechanism with certainty is possible because the operation does not require difficult timing in consideration of an unstable shape such as a tape.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a mechanism in the vicinity of a rotary magnetic head device of a magnetic recording / reproducing apparatus according to an embodiment of the present invention. FIG. 2 is a view showing a back surface of a main part of FIG. 3 is a plan view of relevant parts showing a state in which the tape loading operation of the apparatus shown in FIG. 1 is completed. FIG. 4 is a view showing an example of shapes of a guide roller block that performs tape drawing and tape guiding and parts of a drive mechanism thereof from three directions. 5 to 8 are plan views showing an example of shapes of main parts used in one embodiment of the present invention. FIG. 9 is a cross-sectional view showing an arrangement state of guide pin arms. FIG. 10 is a diagram showing an example of holding means for an audio control head. [Explanation of Codes] 1 ... Cassette, 2 ... Tape, 3, 4 ... Guide roller block, 5 ... Guide pin arm, 5a ... Inclined pin, 9 ... Rotating cylinder, 11 ... AC head, 22 ... AC head arm, 27 ... Drive arm, 28 ... Operation arm, 29 ... Operation arm, 31 ... Cam gear, 39 ... Cam gear.

Continued front page    (56) References JP-A-58-220263 (JP, A)               JP-A-61-957 (JP, A)               55-141368 (JP, U)               Actual Development Sho 60-26654 (JP, U)

Claims (1)

[Claims] 1. In a magnetic recording / reproducing apparatus that pulls out a tape from the tape cassette and attaches the tape to a predetermined tape running path, the first one in the space occupied by the mounted cassette
The tape is pulled out from the first position and the second position in the space occupied by the mounted cassette and the first tape guide means operable to the supply position facing the supply side of the rotary magnetic head device. Second tape guide means operable to a winding position facing the winding side of the rotary magnetic head device, and the first and second tape guide means from the first and second positions respectively to the rotary magnetic head. First pull-out means for operating on the supply side and the winding side of the apparatus, an audio control head for recording or reproducing an audio signal and a control signal, and the audio control head is a tape when the tape is loaded. Located on the path and in the third position in the space occupied by the loaded cassette, and while pulling out the tape Second tape guide means located between the second tape guide means and the audio control head and operable at a fourth position; and the third tape guide means at the third and fourth positions in the cassette. Is inclined with respect to the bottom surface, and moves the third tape guide means from the third position to the fourth position while maintaining the inclination angle of the third tape guide means with respect to the bottom surface of the cassette. A magnetic recording / reproducing apparatus having a second drawing means that operates. 2. 3. The third tape guide means according to claim 1, wherein the third tape guide means has a rotation fulcrum substantially outside the predetermined tape running path, and is located substantially rearward of the audio control head, and rotates laterally across a front portion of the audio control head. The magnetic recording / reproducing apparatus is configured to be operable from the third position to the fourth position. 3. 3. The magnetic recording / reproducing according to claim 2, wherein the second pull-out means is operable from the second position to the take-up side position after the operation of the second tape guide means. apparatus.