JPS59201277A - Tape cassette - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to tape cassettes, and more particularly to means for maintaining tape tension when the cassette is removed from a tape feeder.

Tape cassettes typically contain two reels wrapped with tape to allow free running of the tape between the reels, with this tape running occurring on one "side" of the cassette. - this side is open or provided with a cover door that can be opened when the cassette is inserted into a tape feeder (e.g. magnetic tape recording, playback and rewinding machine); Typically, the side of the cassette adjacent and orthogonal to this open side is provided with a small opening for the insertion of a capstan, play-record and erase heads, various guides, etc., and is equipped with a small opening for the insertion of a capstan, play-record and erase heads, various guides, etc. The part to be inserted must engage the side of the tape facing towards the inside of the cassette. If the free running part of the tape is too free and loose, it will travel far back into the cassette and damage the capstan and other parts. Such elements cannot pass behind the free tape run and the machine cannot advance the tape and operate to record or play. If the running part of the loose tape is not too fast from the cassette, the tape will become tangled inside the tape feed & can also cause other malfunctions. If the reel becomes loose during handling, i.e., outside the tape feeder, vibrations or other sudden shaking may cause the tape coil to become somewhat unwound and conical, causing direct or This will result in damage to the edge of the tape, and damage to the tape feed guide.

In conventional technique 91.j, cassette 1) A spring pressurized friction brake or a snap-pinion configuration is installed in the cassette!・
J during this time by locking the reel or ai:j at the 1.
I was trying to change Ki to L-f'l;<L. Tape feed (some parts of the person are made so that when the cassette is loaded, they are directly aligned with the claws, and the cassette is mounted on the tape. 4.°,
While it was in the state, the thing stopped the reel. It is designed to release energy. Such an arrangement is disclosed in U.S. Pat. No. 3,900.172, in which the cassette cover door is automatically opened by a mechanism within the tape advance when the cassette is installed. , the door then stops the pawl from engaging the pinion gear of the cassette reel.

However, such configurations are limited to continuing the tape tension or tape slack conditions that exist when the cassette is removed from the tape feeder - the running of the tape on the release side of the cassette is limited to the subsequent insertion. Sometimes it is still too loose to work properly. There is no active effort to cause the tape to actually be placed under tension if it is not already under tension.

It is therefore an object of the invention to ensure that the tape is always under tension when the cassette is removed from the tape feeder.

For this and other purposes, the cassette has a spring-loaded indexer 47"j that rotates the reels in the tape winding direction to positively allow free running of the tape between the reels when the cassette is removed from the tape stock. This is achieved by

] and 2 are the top part 12, bottom part 13, shingle wall 14, J5,
Back walls 1G and 13:J shows a nearly kyūgyo-shaped cassette 11 with an ID face J7. A free tape running section 18 is present on the cassette side 17 by a guide 19.

The tape is wound in opposite directions on a pair of reels 21,22''. Although its hub and flange are shown in dashed lines in FIG. 2, each reel has gear teeth 23 and a central tapered hole 24 for insertion into a respective mounting arbor of a tape feed lever (not shown). Pinion with
It has a lower concentric extension formed as a gear.

These pinion extensions are shown in cross section in FIG.

If there is no cassette in the tape feeder, reel 2L
22 are freely positioned within the cassette by extension bearing pinion teeth 23, with a portion of the extension extending downwardly through openings 26 in the bottom wall 13 of the cassette, each of which is closed by a raised lip 27. The edges are removed,
The lip is adapted to oppose and support the bottom flange of each reel. Each lip 27 has an opening 28 for insertion of a toothed portion 31 of a rack assembly 32 comprising a carrier member 33 having a peg 34 pivoted thereon by a pivot pin 36. The tooth part 31 is actually a fit 34
The pawls are formed on each pinion tooth 23 of the reel.
It is spring-loaded by a spring 37 so as to be pressurized in the direction of engagement. The rack carrier portion 33 is mounted for sliding along a central path between the two reels in a direction perpendicular to a plane joining and containing the two reel axes, and the rack carrier portion 33 is mounted to slide along a central path between the two reels in a direction perpendicular to a plane that joins and contains the two reel axes. Each reel is spring-loaded by a compression spring 38 to support it in engagement with the tape running portion 18 and to load each reel in the winding direction to positively tension the tape running portion 18.

Each pawl 4 has an arm 41 which extends to a location where an aperture 42 is provided in the bottom wall 13 of the cassette, where one
The pair of key elements 43 is inserted from the tape feed position, moves the key 43 in a downward direction (that is, in a downward direction in the drawing), and clicks 1! i 3] from the pinion ti 123 in the radial direction (both have a directional component parallel to the plane of the reel axis). In addition to this movement, the rack carrier member 33 is retracted upward (in the upward direction in the drawing). The pin 44 extends from the tape advancer and positions itself in an opening 46 in the cassette bottom 13. The carrier portion 33 also has a central opening 47;
This allows part 4'A' 33 to rest upon sliding with one track bolt. It also holds a retaining plate 48 which partially overlaps and guides the member 33 in its sliding motion, and is also clouded to hold one end of the spring 38.

For some purposes, the rack and pinion combination is
It may also be combined into a simpler combination as shown in the figure (
In that case, rack plate 33a is configured to have the same spring-loaded bin retractable linear movement as member 33 of FIG. 2, with plate 33a extending from the cassette bottom wall.
It has another guide 51 inserted into the slot 52 of. A pair of linear rack gears 46 are formed on the sides of the plate 33a to engage the pinion teeth 23 and load the reel in the tape winding direction. The configuration of FIG. 3 eliminates the need to use the catch 34 or the forward key 43.

However, in the configuration of FIG. 3, the plate 33a is used to ensure sufficient loading of the IJ-rule and tensioning of the tape in one direction, and to completely retract the jaw 23 in the other direction.
If the reel is fairly loose in the cassette, the teeth of the plate 33a may come out of engagement with the pinion teeth 23.

[Brief explanation of the drawing]

Figure 1 is an open elevational view of the tape cassette showing the free running portion of the tape between the reels. FIG. 3 is a partial sectional view showing the cover removed. FIG. 3 is a schematic view showing a partial modification of FIG. 2. In the figure, 23 is a gear tooth, 31 is a tooth portion, 33 is a carrier member, and 34 is a pawl , 4J indicates the arm.Special Ff Ex, lA Patent attorney representing Ampex Corporation Ii 1) Nobu Yuki 1XU5 3

Claims (1)

[Claims] (1) In a tape cassette of the type containing/having at least one tape reel, said reel is moved in the tape winding direction to fix the tape extension and to impart tension to said tape portion. and means for engaging and weighting the reel and tape, said means being capable of being released from the exterior of said housing to deactivate said reel and tape. tape cassette.