JP2718438B2 - Tape drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus using a tape such as a VTR as a recording medium, and more particularly to a tape drive suitable for a small and lightweight camera-integrated VTR or the like. About. 2. Description of the Related Art Conventionally, in a device such as a VTR, main factors governing the size of a mechanism include a tape guide drum size, a cassette size, and a loading mechanism which are determined systematically. This loading mechanism, for example,
In recent years, a ring-type camera has become mainstream since a wide-angle winding is required as a four-head small-diameter drum system in correspondence with a VTR-integrated camera such as a VHS-C cassette. That is, a ring is disposed substantially concentrically around a tape guide drum having a built-in rotary head, and a tape guide group is connected to the ring to perform loading / unloading of the tape by rotation of the ring (tape guide driving member). Things. Compared with the conventional arm system, such a ring system can easily cope with wide-angle winding around a drum and can eliminate the number of parts without requiring a complicated articulating arm. The base on which these mechanisms are mounted is usually rectangular. Related to this type of device is, for example, a structure described in Japanese Patent Application Laid-Open No. 60-18848. [0003] In the above prior art, sufficient consideration has not been given to reducing the size and weight of the mechanism, and since the chassis is rectangular, the shape of the mechanism is unnecessarily large. Had become. On the other hand, a camera-integrated VTR, which is required to be small and lightweight, includes not only a mechanism but also a circuit section and a camera section, and therefore, it is necessary to arrange them compactly as a whole. Therefore, if the main mechanism is rectangular, the camera-integrated VTR
The overall shape of the device is affected, resulting in an increase in the size of the entire device and an increase in weight. An object of the present invention is to eliminate the disadvantages of the prior art and to reduce the size and weight of the mechanism and the size and weight of the device by reducing the plane area of the chassis. In order to achieve the above object, the present invention is directed to a tape guide device and a tape drive unit mounted on a base, and a cassette containing a tape is mounted. Then, the tape is pulled out from the cassette by the tape guide means to form a tape traveling path including a guide drum, and the tape is driven to travel along the tape traveling path by the tape traveling driving means. In the tape drive device having the configuration, the base has a slanted outer portion in a direction from the guide drum side to the tape traveling drive means, and the tape guide means, on the tape exit side than the tape entrance side of the guide drum, The tape wrap angle around the guide drum as viewed from the cassette side is increased to make it asymmetrical,
In addition, the tape running path on the tape exit side of the guide drum is formed such that the tape running in contact with the guide drum is turned substantially in the opposite direction, and runs substantially along the guide drum. According to the above construction, the tape guide means and the tape running drive means are mounted on the base, and the tape guide means allows the guide drum to be closer to the tape exit side than to the tape entrance side and to the cassette side. The tape is wound around the guide drum a lot and folded in almost the opposite direction.
Since the tape running path is formed so as to travel substantially in the direction of the tape running driving means along the guide drum, the tape running path can be shortened. The oblique outer part in the direction of the head can be provided close to the guide drum, and the flat area of the base on which the tape guide means and the tape traveling drive means are mounted can be reduced. The size can be reduced. An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view showing a completed loading state of a magnetic recording / reproducing apparatus using a tape drive of the present invention, wherein 1 is a chassis, and 2 is a rotating magnetic head (not shown).
, A tape guide drum having a tape 6 wound diagonally at a predetermined angle, a cassette 3 containing a tape 6 wound around a supply reel 4 and a take-up reel 5, and a capstan motor (7) at a lower end. (Hereinafter simply referred to as motor), 8 is a pinch roller, 8 is an erasing head for erasing the entire width of the tape 6, 11 is an audio signal and a control signal recorded and reproduced on the upper and lower ends of the tape 6. Audio control head. In FIG. 1, when the cassette 3 is mounted on the apparatus, the lid 12 on the front face of the cassette 3 is opened, and a tension pin 16, a guide roller 17 and an inclined pin 18 are provided in an opening 13 of the cassette 3. The guide roller 19 and the inclined pin 20 are inserted into the opening 14 of the cassette 3, and the inclined pin 21 and the capstan 7 are inserted into the opening 15 of the cassette 3 at positions indicated by broken lines and solid lines, respectively. 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 from the cassette 3 on which the tape 6 is mounted. The guide roller 17 and the inclined pin 18 together constitute a first (tape entry side) guide roller group, which moves in pairs along the substantially outer peripheral surface of the tape guide drum 2 and moves horizontally. It is positioned near the guide drum 2. Further, the guide roller 19 and the inclined pin 2
0 together form a second group of guide rollers (on the tape exit side), which move horizontally in pairs as far as the vicinity of the audio control head 11, and then move diagonally downward therefrom to the tape shown in FIG. The guide drum 2 is positioned near the side substantially opposite to the cassette 3 side. That is, a tangent line parallel to the front surface of the cassette 3 and in contact with the outer peripheral surface of the tape guide drum 2 opposite to the cassette 3 is assumed. Assuming that the contact point is the deepest point of the tape guiding drum 2,
At least some members of the guide roller group of FIG.
As shown in the drawing, the second guide roller group is positioned so that at least the guide roller 19 shown earlier goes around the innermost point of the tape guide drum 2. By positioning the first and second guide roller groups in this manner, the tape 6 is attached to the tape guide drum 2.
However, the tape guide drum 2 can be reduced in size by being wound approximately 270 ° in a symmetrical manner when viewed from the cassette 3 side. Here, the second position, which is positioned as described above,
The position of the guide roller group is set outside the chassis 1, so that the second guide roller group thus positioned can be arranged at a position lower than the chassis 1 surface, and this is 1, the height of the entire mechanism can be reduced. The tilting pin 21 moves horizontally from behind the tilting pin 20 and is fixed upstream of the audio control head 11, whereby the attitude of the tape 6 is corrected and guided to the take-up reel 5. As a result, the cassette 3 is spirally wound at a predetermined angle on the tape guide drum 2 through the tension pin 16, the height regulating guide 22, the erasing head 10, the guide roller 17, and the inclined pin 18, and the guide roller 19, the inclined pin 20, the inclined pin 21, the fixed guide 23, the audio control head 11, the height regulating guide 24, the fixed guide 25, and the take-up reel 5 via the portion pinched by the capstan 7 and the pinch roller 8. Tape 6 leading to
, That is, a tape running path is formed. And
The rotation of the capstan 7 causes the tape 6 to rotate.
Runs on this tape running path. Here, a straight line connecting the center O of the supply reel 4 and the center O 'of the take-up reel 5 is XX', and the take-up reel 5
A straight line passing through the center O ′ of
Assuming that Y ′, the center of each of the capstan 7 and the pinch roller 8 is disposed on the opposite side of the tape guide drum 2 with respect to the straight line YY ′. As a result, the holding portion of the tape 6 between the capstan 7 and the pinch roller 8 is set close to the tape inlet of the cassette 3, so that the holding portion of the tape 6 and the pin of the tape inlet of the cassette 3 The length of the tape path between them is shortened, so that the bending in this tape path is reduced, and the friction of the tape 6 generated at this portion can be greatly reduced. The tape running path on the exit side of the tape guiding drum 2 is provided with the positioned guide rollers 19,
The tape 6 is folded substantially in the opposite direction by the inclined pin 20, and the capstan 7 is moved along the vicinity of the tape guide drum 2.
And is formed so as to follow the tape guide drum 2 side as much as possible. In addition, since the capstan 7 is disposed near the tape inlet in the opening 14 of the cassette 3, the pinch roller 8 is also disposed near the cassette 3 and includes the motor 9, the capstan 7, and the pinch roller 8. Tape running drive means is cassette 3.
Will be placed near the For this reason, the portion outside the tape running path on the exit side of the chassis 1 from the vicinity of the tape guiding drum 2 to the vicinity of the tape running driving means becomes a complete space. An oblique outer portion 1a is formed from the vicinity of the tape guide drum 2 on the side of the side to the vicinity of the tape travel drive on the side of the tape traveling drive means, and this space is removed to reduce the area of the chassis 1. I am trying to become. Thereby, the size of the entire apparatus can be reduced. FIG. 2 is a side view showing a state at the time of completion of loading, and FIG. 3 is a side view showing a state at the time of completion of unloading. Parts corresponding to FIG. 1 are denoted by the same reference numerals. In FIG. 2, reference numeral 26 denotes a guide base on which a guide roller 17 and an inclined pin 18 are erected and are positioned and held by a catcher 28. 27 is also a guide base, on which the guide roller 19 and the inclined guide 20 are erected, and similarly positioned and held 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. Thereby, the tape guide drum 2
The tape guide drum 2 can be arranged under the front lid 12 that opens forward of the cassette 3 when the cassette 3 is mounted by reducing the inclination angle of the cassette 3 and arranging the tape guide drum 2 at a position slightly lower than the cassette 3. It is designed to be smaller and lighter. Here, the loading mechanism in the magnetic recording / reproducing apparatus shown in FIG. 1 will be described in detail. FIG. 4 is a perspective view showing the guide moving member on the exit side of the loading mechanism. In the figure, a guide base 2 on which a guide roller 19 and an inclined pin 20 are erected is shown.
7 is supported by a connecting plate 29 rotatably in a plane as indicated by an arrow in the figure, and the connecting plate 29 is also rotatable in a plane as indicated by another arrow. Supported by 30. As shown by another arrow, the connecting plate 30 is supported by one end of the output side driving member 31 so as to swing freely in the vertical direction. The exit side driving member 31 has an arc shape, and a gear portion 31a is provided on an outer periphery thereof. FIG. 5 is a perspective view showing a guide moving member on the entry side of the loading mechanism. In the figure, a guide base 2 on which a guide roller 17 and an inclined pin 18 are planted is shown.
Reference numeral 6 denotes a connecting plate 3 rotatably in a plane as indicated by an arrow.
2 and the connecting plate 32 is connected to the input side driving member 3
As shown by another arrow, it is rotatably supported by a U-shaped portion 33b provided at one end of the third. Exit drive member 31
Is located inside the U-shaped portion 33b, that is, the entry side driving member 33
The two driving members do not collide with each other or the driving member and the guide group do not collide with each other during the movement. The entry side driving member 33 is also formed in a circular arc shape, and a gear portion 33a is provided on the outer periphery thereof. FIG. 6 is a perspective view showing the cam 34 of the loading mechanism. In the same figure, the cam 34 is composed of two upper and lower stages, the upper stage includes a gear portion 34a and a cam portion 34b from the left, and the lower stage includes a stopper surface 34b corresponding to a Geneva gear (described later), There are a cam portion 34c corresponding to the mode operation, a cam portion 34f corresponding to the middle of loading / unloading, and a cam portion 34e corresponding to the mode operation after the unloading, and has an arc shape as a whole. These are arranged on the chassis 1 concentrically from the top in the order of the output drive member 31, the input drive member 33, and the cam. FIG. 7 is a plan view showing a mechanism for moving the inclined pin 21 disposed on the exit side of the loading mechanism. In the same figure, the gear portion of the support roller 67d engaged with the gear portion of the output side driving member 31 is provided with a gear 6
9 and is integrated with the gear 69 to about 1 /
The gear 70, which is reduced to two, passes through the gears 71 and 72 and the gear 73.
It is connected to. Therefore, the rotation of the output side drive member 31 is transmitted to the gear 73 via these gears, and the gear 73 is driven to rotate. At this time, the rotation is reduced to about ２ by the gears 69 and 70. The gear 73 is coaxially engaged with the arm 74 via a crimp spring (not shown), and moves the inclined pin 21 implanted at the tip of the arm 74 to a predetermined position defined by the catcher 75 to crimp. I do. It should be noted that the inclined pin 21
, The inclined pin 21 is loaded following the guide base 27 from behind. That is, since the movement trajectories of the inclined pin 21 and the guide base 27 partially overlap, when the guide base 27 passes through the overlap portion in advance, the output side driving member 31 and the support roller 67d are engaged. The position of the support roller 67d and the reduction ratio of the drive system of the arm 74 are set so as to drive the inclined pin 21. Accordingly, since the movement of the arm 74 is controlled by the movement of the exit side driving member 31, there is no interference at the overlap portion. Further, the support of the output side driving member 31 and the transmission of the driving force are performed by one support roller 67d, so that the number of parts can be reduced. As described above, according to the present invention,
The friction of the running tape can be reduced, and the tape is wound around the tape guide drum so that the tape is wound almost to the innermost point of the tape guide drum on the side opposite to the cassette side on the tape exit side. over as viewed from the cassette side by winding asymmetrically made smaller diameter tape guide drum, it is possible to reduce the plane area of the entire base for mounting respective mechanisms element mechanisms, in addition, the capstan motor By positioning the capstan shaft, which is coaxial with the rotation shaft of the tape guide drum, on the cassette side with respect to the rotation shaft of the tape guide drum, the tape running drive means is arranged closer to the cassette, and the tape running path on the tape exit side is controlled by the tape. From the tape guide drum, it is folded back in almost the opposite direction by the tape guide means on the tape exit side, and almost the tape guide So as to run in the direction of the capstan shaft along the outer circumferential surface of the ram, since the configuration, form a slant outer portion in a direction towards the vicinity of the tape running driving unit from the vicinity of the tape guide drums in the base table to, be one which can be planar area also significantly reduced in the base platform of the tape exit side, smaller and lighter及<br/> beauty device overall size and weight of the mechanism of the tape drive mechanism is achieved I do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a magnetic recording / reproducing apparatus to which an embodiment of a tape drive according to the present invention is applied. FIG. 2 is a side view showing a state when loading of the magnetic recording / reproducing apparatus shown in FIG. 1 is completed. FIG. 3 is a side view showing a state at the time of unloading of the magnetic recording / reproducing apparatus shown in FIG. 1; FIG. 4 is a perspective view showing an output side tape guide driving member and a tape guide group of a loading mechanism in the magnetic recording and reproducing apparatus shown in FIG. 1; FIG. 5 is a perspective view showing an entry-side tape guide driving member and a tape guide group of a loading mechanism in the magnetic recording and reproducing apparatus shown in FIG. 1; FIG. 6 is a perspective view showing a mode operation unit using a cam member of a loading mechanism in the magnetic recording / reproducing apparatus shown in FIG. FIG. 7 is a plan view showing an output side inclined pin driving mechanism of a loading mechanism in the magnetic recording and reproducing apparatus shown in FIG. 1; [Description of Signs] 1 Chassis 1a Slanted outer portion 2 Tape guide drum 3 Cassette 4 Supply reel 5 Take-up reel 6 Tape 7 Capstan 8 Pinch rollers 17, 19 Guide rollers 18, 20, 21 Inclined pins 26, 27 Guide base 28 Catcher (tape guide positioning mechanism) 31 Outgoing side (second) tape guide driving member 33 Inlet side (first) tape guide driving member 34 Cam member

   ────────────────────────────────────────────────── ─── Continuation of front page    (56) References JP-A-59-63051 (JP, A)                 JP-A-60-18848 (JP, A)                 JP-A-59-217262 (JP, A)                 JP-A-61-188769 (JP, A)                 JP-A-61-206954 (JP, A)

Claims (1)

(57) [Claims] A tape guide means and a tape running drive means are mounted on a base, a cassette containing a tape is mounted, and the tape is pulled out of the cassette by the tape guide means, and a tape running including a guide drum is performed. A tape drive device, wherein a path is formed, and the tape is driven along the tape travel path by the tape travel drive means, wherein the capstan is coaxial with a rotation axis of a capstan motor in the tape travel drive means. The shaft is disposed closer to the cassette than the center of rotation of the guide drum, and the base is provided with a slanted outer portion in a direction from the vicinity of the guide drum to the vicinity of the tape running drive means, The contact point between a tangent line parallel to the front surface of the cassette and the outer peripheral surface of the guide drum opposite to the cassette and the outer peripheral surface of the guide drum opposite to the cassette is formed. As the innermost point of the inner drum, substantially along the outer peripheral surface of the guide drum until at least a part of the tape guide means on the tape exit side of the guide drum turns around more than the innermost point of the guide drum. By moving the tape guide means on the tape exit side of the guide drum, the tape is wound approximately 270 ° around the guide drum in cooperation with the tape guide means on the tape entry side of the guide drum, The winding range of the tape around the guide drum on the tape exit side is larger than the tape entrance side of the guide drum, so that the winding state of the tape around the guide drum as viewed from the cassette side is asymmetric, and the tape traveling in contact with the guide drum, is folded in the substantially opposite direction by the tape guide means on the tape exit side of the guide drum, and the guide drum and the swash-shaped outer portion The so as to run substantially in the direction of along the slant outer portion said capstan shaft, leaving the tape in the guide drum
A tape drive device comprising the tape running path on the side .