DE2166790A1 - Cassette for tape recorders with cassette changer - Google Patents

Abstract

The cassette contains tape spools and a braking device which acts in conjunction with the walls of the cassette. Pref. the spools have two members which slide relative to each other and are urged by a spring against the cassette walls to produce the braking action. The braking members are moved out of contact with the walls by clamping devices against the spring force so that the spools are free to move inside the cassette. Pref. the clamping devices each have a pin which enters a bore in the braking member, releases the brake and centers the tape spool.

Description

Patent attorneys Dipl.-Ing. F. Wsickmänn,

Dipl.-Ing. H. VfiicKMANN, Dipl.-Phys. Dr. K. Fincke 'Dipl.-Ing. FA ¥ eickmann, Dipl.-Chem. B. Huber

D XIII 8 MUNICH 86, THE ^

P 21 66 790 3 POSTBOX 860 820

MÖHLSTRASSE 22, CALL NUMBER 98 39 21/22

Ampex Corporation

401 Broadway, Redwood City, Calif. 94063 / üSA

Magnetic tape cassette for use in a cassette changer trained magnetic tape player

The present invention relates to a magnetic tape cassette for use in a magnetic tape player designed as a cassette changer, with coil cores located in a cassette housing and carrying a magnetic tape, the coil cores in the Playback device are rotatably mounted by clamping devices and wherein in the playback device magnetic tape pneumatically in vacuum chambers pulled and in this by a belt drive to transducer assemblies is passed.

In the case of magnetic tape players designed as cassette changers a cassette to be played is guided out of a magazine into a playback position in which magnetic tape is first removed from the Cassette brought out in operative connection with transducer assemblies and then fed past the transducer assemblies by a tape drive for playback.

With the magnetic tape cassettes in stock in the magazine care must be taken to ensure that the coil cores in the

609812/0783

Cassette spooled magnetic tape cannot be unwound, so that the magnetic tape does not get caught in the cassette or fall out of the cassette. For this purpose, the magnetic tape that is rotatably mounted in the cassette supporting bobbin cores be braked when the cassettes are in the magazine. However, if a cassette is in the player out into the playback position, the braking of the reel cores must be automatically releasable so that the magnetic tape can be played can be. ...

The present invention is based on the object of a Possibility of decelerating coil cores in magnetic tape cassettes in the aforementioned sense.

In the case of a magnetic tape cassette of the type mentioned at the outset, this object is achieved according to the invention by an on the reel cores provided, with walls of the cassette housing in operative connection stepping brake arrangement released.

Refinements of the inventive concept are in the subclaims marked.

The invention is illustrated below with reference to in the figures of FIG Drawing illustrated embodiments explained in more detail.

It shows:

Figure 1 is a side view of part of a magnetic tape player with a magnetic tape cassette changer;

and

FIG. 2 shows an enlarged cross-sectional view of an in a magnetic tape cassette located in a player.

In Figure 1, a magnetic tape player 11 is generally shown, that is a pair of vacuum belt loop chambers 12 and

- 3 6098 12/0783

with inlet openings 15 and 16 which are in communication with a vacuum pump, not shown. Farther are a drive capstan 17, one for television recording suitable transducer arrangement in the form of a rotary head device 18 with a retractable guide member 19 and various Heads 21 for longitudinal tracks on the magnetic tape and air bearing guides 22 provided. In this device, a cassette 23 to be played is oriented relative to an opening 24, by means of which a belt loop 26 is drawn into the device by means of a vacuum. Djese tape loop runs lengthways a dashed line 27.

In short, a cassette 23 containing inside of it tape reels 32 and 33 wound on spool cores 47 is made from a magazine 28 by a transport rod 39 actuated by a motor 40 for playback in a cassette holding device 41 inserted and returned to the magazine 28 after playback.

JB

As FIG. 2 shows in detail, a coil core 47 has one Cassette 23 an outer sleeve 57 which carries a tape roll and which can be removed from the cassette together with the tape roll is when a tape change is required. The sleeve 57 has a centered inner flange 58, which in shoulders which are formed on a pair of fitted core members 61 and 62. The core element 61 has a centering hole and a plurality of drive groove bores 64 arranged on a circle. It also has an axial one with a centering bore 67 provided shaft extension 66j which runs in the other direction. The core element 62 is cup-shaped and has a central opening in which the shaft extension 66 is displaceable is. The two core elements 61 and 62 held together by fastening elements 68 can be pulled apart, to release the sleeve 57 and the associated tape wrap for the purpose of removal.

609812/0783 BATH ORIGINAL

The coil core 47 also has a brake element 69 » which is fitted into the cup-shaped part of the core element 62, slides on the shaft extension 66 and in the axial direction Direction is pressed outward by a compression coil spring 71. This braking element 69 is against rotation secured with respect to the coil core by a pin 72 which is inserted into corresponding bores in the core elements 61 and 62 is slidably fitted. The assembly of the bobbin 47 can be carried out in a simple manner by inserting the above Elements are made in the outer sleeve 57.

The spring 71 pushes the elements 69 and 61 apart and therefore has the effect that the Kerneleraent 61 together with one side of the sleeve 57 with an insert 73 in a wall 48 of the cassette housing comes into frictional contact, while the braking element 69 with an insert 74 in a wall 49 of the cassette housing comes into frictional contact. The braking element 69 and the insert 74 have matching conical surfaces and thus form a pressure bearing. When the elements -69 and 61 are pressed against one another and thus the spring 71 is compressed the two braked sides of the coil core are released so that the two sides of the coil core are loose are stored in the cassette housing. This enables a more precise setting by means of clamping devices 51 and 52.

The tensioning devices 52 are connected to a compressed air line via which a piston which is under spring tension 79 can be actuated by means of compressed air. By means of a pair of ball bearings 83 are a centering pin 81 and a flange 82 mounted centrally on the piston 79, which are set in rotation by rotating the sleeve. If the piston 79 is actuated, so The upper end of the pin 81 dips into the bore 67 and centers the coil core 47 while the flange 82 does Pushes the braking element away from the insert 74, thereby releasing the brake contact. The clamping elements 51 are on a

- 5 ORIGINAL BATHROOM

8 0 9 8 12/0783

Drive shaft 86 mounted, which is driven by a motor 87. They each have a disk 88
as well as a hollow cup-shaped one attached to it
Element 89 which together form a housing for an axially
sliding, spring-loaded piston 91 form. The piston 91 is wedged against rotation by a pin 92 with the disk 88 and the drive shaft 86,
the pin 92 passing through the disc 88 and the piston 91. The piston 91 also has a fastening pin which runs through the housing element 89 and, when actuated, dips into one of the wedge-shaped bores 64. The piston also has a centering pin 93 and a flange 94, the centering pin running through a corresponding opening in the housing element, dipping into the centering bore 63 and canceling the braking contact between the core element 61, the sleeve 57 and the insert 73. To operate the piston, in
a bearing element 96 lines 97 and bores 98 and 99 are provided through which compressed air into a shaft 86

m.

surrounding manifold 101 provided with seals 102 is admitted. The shaft 86 has a radial
Passage 103 through which the distributor pipe 101 is in communication with an axial bore 104 in the shaft. Compressed air for actuating the piston can be supplied through the bore 104 located on the rear side of the piston 91.

BATH ORIGINAL

6098 12/0783

Claims (5)

Claims Magnetic tape cassette for use in a magnetic tape player designed as a cassette changer, with reel cores located in a cassette housing and carrying a magnetic tape, the reel cores being rotatably mounted in the player by clamping devices and wherein in the player magnetic tape is pneumatically drawn into vacuum W chambers and in them by a Tape drive is guided past transducer arrangements, characterized by a brake arrangement (57, 61, 69) provided on the coil cores (47) and operatively connected to walls (48, 49) of the cassette housing. 2. magnetic tape cassette according to claim 1, characterized in that g e k e η η, that the coil cores (47) each have two parts which can be displaced in the axial direction relative to one another (57, 61, 62 or 69) which, under the action of a spring (71), each have a wall (48 or 49) of the cassette housing come into braking contact and counteract the action of the clamping devices (51, 52) The spring (71) can be released from the braking contact with the walls (48, 49) of the cassette housing in such a way that the coil cores (47) are stored loosely in the cassette housing. 3. Magnetic tape cassette according to claim 1 and 2, characterized in that the two are relative to one another movable parts (57, 61, 62 or 69) include the following components: A sleeve (57) provided with an inner flange (58), - 7 6 0 9 8 12/0783 ⁷ 216679Ü a first one inserted into the sleeve (57) from one side and the inner flange on one side (58) seated core element (61) on the side of the associated wall (49) of the Cassette housing has a bore (63) and on the other side in one with a bore (67) provided shaft extension (66) runs out, a second, from the other side into the sleeve (57) inserted and on the other side of the inner flange (58) as well as on the first Kerneleraent (61) seated cup-shaped core element (62), and an inserted into the second cup-shaped core element (62) and seated on the shaft extension (66) Brake element (69), the spring (71) between the second core element (62) and the brake element (69) is arranged on the shaft extension (66). 4. Magnetic tape cassette according to one of claims l to 3 » characterized in that the braking element (69) is on the side of the associated wall (49) of the cassette housing runs out into a conically shaped extension that in the associated wall (49) a correspondingly shaped conical insert (74) is provided, with which the conical extension of the Braking element (69) under the action of the spring (71) comes into braking contact, and that in the wall (48) of the cassette housing assigned to the first core element (61) an insert (73) is provided with which the sleeve (57) and the core element (61) under the action the spring (71) come into braking contact. 5. Magnetic tape cassette according to one of claims 1 to 4 »characterized in that the - 8 609812/0 7 83 Brake contact releasing clamping devices (51, 52)
each have a piston-operated centering pin (81, 93) which is inserted into the bores (63, 67) of the first
Engage core element (61) and the brake contact
loosen against the action of the spring (71), at the same time centering the coil cores (47). BATH ORIGINAL 6098 12/078 3 L e r s e i t e