JPH0415541B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an improvement in a loading mechanism that pulls out a tape from a cassette and winds it around the circumferential surface of a guide cylinder.

(b) Prior Art In a video tape recorder, the loading mechanism for loading the tape by moving the guide means in both directions with respect to the guide cylinder has two methods: one in which the guide means is moved by a complex combination of levers; A commonly used method is to arrange guide means on two arcuate support guides that rotate in different directions.

(c) Problems to be Solved by the Invention However, in the case of the above-mentioned prior art, the guide means on the supply side and the take-up side wrap the tape approximately equally around the guide cylinder, and as a result, the tape is wound approximately equally around the guide cylinder. The folded tape running path of the guide means became longer, causing extra load fluctuations on the winding side tape running path, and the stable running of the tape was hindered.

Therefore, the present invention proposes a loading mechanism whose purpose is to maintain stability in tape running.

(d) Means for Solving the Problems Therefore, the present invention provides a supply-side guide means for supply-side/take-up-side guide means, and a supply-side guide means for deeply winding the supply-side guide means around a guide cylinder to lengthen the return tape running path on the supply side. A winding-side guide means for shallowly winding the winding-side guide means around a guide cylinder to shorten a running path of the folded tape on the winding side, and a drive means for commonly driving both guide means. do.

(E) Effect Therefore, according to the present invention, the tape fed out from the supply reel reaches the guide cylinder via a long running path and the supply guide means, slides on the guide cylinder, and reaches the take-up guide means. Then, after passing through a short turning path, it is wound onto the take-up reel with a small winding force.

(F) Embodiment The present invention will be described below with reference to an illustrative embodiment. FIG. 1 is a plan view of the mechanism of this embodiment with the upper substrate removed, and FIG. 2 is a right side view of the same. In the figure, number 1 is a guide cylinder arranged at a predetermined angle with respect to the substrate, 2 is a tape cassette indicated by a dashed line, and 3 is a left notch 2 of the cassette 2.
a first support block 4 supports a first upright guide 3a and a first inclined guide 3b located in the cassette 2; A second support block, 5 is a loading disk that rotates with the first support block 3 arranged thereon, 6 is a rack plate that moves linearly with the second support block 4 arranged thereon, and 7 is the first support block. a first loading lever that holds and fixes the block 3, fits the planting pins 5a, 5a of the loading disk into the long holes 7a, 7a, and is pulled and biased toward the loading disk by the first spring 7b; Reference numeral 8 denotes a second support block 4 which is mounted and fixed, and the planting pins 5a, 5a on the rack plate are fitted into the elongated holes 8a, 8a, and the second support block 4 is pulled and biased in the loading direction by the second spring 8b. A loading lever 9 is a tape pull-out lever that rotates the tape pull-out pin 9a from the illustrated position to the dotted line position or vice versa in conjunction with the loading start operation and unloading end operation of the loading disk 5; A small diameter gear 10a meshes with a gear portion 6b on the right side of the plate 6, and a large diameter gear 10b meshes with a gear portion on the inner circumference of the loading disk 5.
and a loading gear integrally molded with a medium diameter gear 10c that meshes with the intermediate gear 11, 12 a drive motor that rotates the drive gear 13 that meshes with the intermediate gear 11, and 14 a drive motor that rotates the drive gear 13 that meshes with the intermediate gear 11; Due to the bias, the first upright guide 3
a into the V-shaped notch 14a, and a protrusion 1 which can be adjusted forward and backward into the conical notch 3c of the first support block 3.
The first locking block 15, which is brought into contact with the second spring 8b and positions the guides 13a and 13b, is biased by the second spring 8b upon completion of loading.
A second engagement member for positioning both guides 4a and 4b by bringing the second upright guide 4a into contact with the V-shaped notch 15a and the conical notch 4c of the second support block 4 with a protrusion 15b that can be adjusted forward and backward. stop block,
16, 16, 16 are the loading disks 5
The pulleys that support each are revealed.

Therefore, according to this embodiment, when the drive motor 12 starts rotating during loading after the cassette is attached, the drive gear 13 and the intermediate gear 11
The loading gear 10 is driven clockwise through. Therefore, the loading gear 1
0 moves the rack plate 6 at a slow speed in the direction of arrow A in the figure.
At the same time, the loading disk 5 is rotated clockwise at a high speed. As the rack plate 6 slides, the two guides 4a and 4b on the second support block 4 move in the direction of arrow A while pulling out the tape, thereby winding the tape around one of the guide cylinders 1. , before the sliding of the rack plate 6 is completed, the second support block 4 is brought into contact with the second locking block 15, and when the sliding is completed, the conical notch 4 is formed in the protrusion 15b.
c, and the second upright guide 4a is pressed into contact with the V-shaped notch 15a, so that both guides 4
a, 4b, the rack plate 4 is slid extra on the second placement lever 8, and the second spring 8b moves the placement lever 8 against the second locking block 15. Forces traction to the side. On the other hand, when the loading disk 5 rotates, the tape pull-out pin 9a is first moved to the outside of the cassette 2, and the two guides 3a and 3b on the first support block 3 are moved along the loading disk 5. and wrap a tape around the other peripheral surface of the guide cylinder 1, and before the rotation of the loading disk 5 is completed, the first locking block 14 is moved.
The first upright guide 3a is brought into contact with the V-shaped notch 14a in the same manner as the second support block 3 after the rotation is completed.
Further, the conical notch 3c is brought into pressure contact with the protrusion 14b to position both guides 3a and 3b.

Therefore, when loading is completed, the tape is pulled out from the cassette, and the tape is pulled out from the tape pull-out pin 9a, fixed head 17, and impedance roller (not shown).
After being guided by the first upright guide 3a, the inclination angle of the tape is changed by the first inclined guide 3b, and the tape is circumferentially guided around the inclined guide cylinder 1. The inclination angle of the tape guided out from the guide cylinder 1 is corrected by the second inclined guide 4b, and the second upright guide 4a, impedance roller (not shown) fixed head 18, pinch roller 19, and capstan 20 etc., and wound into a cassette.

(g) Effects of the invention Therefore, according to the present invention, since the folded tape running path on the winding side is short, there is no variation in running of the tape due to expansion and contraction of the tape, and the stability of tape running is maintained. It's large.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing an embodiment of the present invention;
FIG. 2 shows a right side view of the same. 4...Rack plate, 5...Loading disk, 10...Loading gear, 3a, 3b, 4
a, 4b...Guide.

Claims (1)

[Scope of Claims] 1. A supply-side/take-up-side guide means located in a notch of a cassette, and a tape pulled out from the cassette by moving the supply-side guide means for a long time to be wound deeply around the guide cylinder, A supply side guide means for forming a long folded tape running path between the cassette and the supply side tape guide means, and a tape taken out from the cassette by moving the take-up side guide means briefly so that the tape pulled out from the cassette is wound shallowly around the guide cylinder. , a winding-side guide means for forming a short return tape running path between the winding-side guide means and the cassette, and a drive means for commonly driving the supply-side guide means and the winding-side guide means, respectively. A loading mechanism consisting of