JPH0227419Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a VTR loading mechanism suitable for use in ultra-compact VTRs such as 8 mm video. (b) Prior Art In recent years, VTRs have become more compact and a camera-integrated VTR called 8mm video has been developed. In this 8mm video, the loading mechanism must be as simple and compact as possible. (c) Purpose of the invention This invention was created in view of the above points.
This provides a loading mechanism suitable for downsizing VTRs. (d) Structure of the invention The present invention includes a leading guide block that pulls the tape out of the cassette and wraps it around a guide cylinder at a predetermined angle, and a tape that is locked to the leading guide block in the unloading state, separated during loading, and rotated to the operating position. and a rotary lever that is normally located on the movement path of the leading guide block and rotates and retracts only when the leading guide block passes, and when unloading,
The VTR loading mechanism is configured to move the tape pull-out means from the operating position to the movement path in conjunction with the retraction of the rotary lever. (e) Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of the mechanism of this embodiment in an unloading state, FIG. 2 is a plan view of the same loading completed state, and FIG. 3 is a plan view of the same unloading state. In FIG. 1, a tape 1 is stored in a cassette (not shown), and a back tension lever 3 having a back tension pin 2 at its tip is locked to a leading guide block 4 . The leading guide blocks 4 and 5 have upright pins 4a and 5a, respectively.
and inclined pins 4b, 5b are planted. When loading is started from this state, the leading guide blocks 4 and 5 pull out the tape 1 from inside the cassette and wind the tape 1 around the guide cylinder 6 at a predetermined angle. On the other hand, the back tension lever 3 rotates counterclockwise around the support shaft 7 due to the biasing of the spring 12 and the movement of the leading guide block, and pulls out the tape 1 to the left. The leading guide block is attached to fixed blocks 10, 11 along the guide grooves 8, 9 as shown in FIG.
It moves to the position where it touches and stops at this position. During this loading, the impedance roller 13 and the erasing head 1 are placed on the guide groove 8.
A rotary lever 16 on which 4 is placed and rotates around a support shaft 15 is inserted therein. However, the leading guide block 4 is not connected to the rotating lever 1.
6, the lever is rotated clockwise against a torsion spring (not shown) and moved forward. After the loading is completed, the leading guide block 4 is again separated from the rotating lever 16, so that the lever is rotated to its original position. In this state, the back tension lever 3 has rotated further to the left of the guide groove 8, and this position is the operating position. Next, during unloading, as shown in FIG. 3, the leading guide block 4 causes the rotating lever 16 to rotate clockwise. This rotation causes the support shaft 1
The actuation lever 18 , which is rotatable about 7, is rotated clockwise by the engagement of the first engagement pin 18a, and the second
The engaging pin 18b engages with the slide lever 19, thereby causing the lever to slide upward. By this slide, the back tension lever is rotated clockwise and positioned above the guide groove 8. In this state, the leading guide block 4 engages with the back tension lever 3, and thereafter, the lever is locked to the leading guide block 4 and is stored into the cassette. After the rotary lever 16 is separated from the leading guide block 4 , it returns to the guide groove 8, and the operating lever 18 and slide lever 19 also return. (f) Effects of the invention As described above, according to the invention, when storing the tape pulling means such as the back tension pin from the operating position, the rotary lever on which the impedance roller, fixed head, etc. are placed can be moved to the leading guide block. is rotated, and in conjunction with this rotation, the tape pull-out means is moved onto the movement path of the leading guide block, so that the leading guide block and the tape pull-out means can be engaged with each other. There is no need to provide a separate means, the loading mechanism can be simplified, and an ultra-compact VTR can be realized.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the mechanism of this embodiment in an unloading state, FIG. 2 is a plan view of the same loading completed state, and FIG. 3 is a plan view of the mechanism in the middle of unloading. Explanation of main drawing numbers, 1... Tape, 2... Back tension pin, 3... Back tension lever, 4 , 5 ... Leading guide block, 16... Rotating lever, 18 ... Operating lever, 19...Slide lever.

Claims (1)

[Claims for Utility Model Registration] A leading guide block for pulling out a tape from a cassette and winding it around a guide cylinder at a predetermined angle; a back tension lever rotatably supported to an operating position in conjunction with the leading guide block, and at least one of an impedance roller or a magnetic head are supported and are always on the movement path of the leading guide block; a rotary lever that is pressed by the leading guide block and rotates to retreat from the movement path only when the leading guide block passes; A control member is provided for moving the back tension lever from an operating position to the moving path, and the back tension lever moved onto the moving path during unloading engages with the leading guide block and is placed in the cassette. A VTR loading mechanism featuring: