United States Patent Office
Patented Mar. 18, 1969
3 433 428
STOP SYSTEM FOR TAPE DECKS Etienne Arthur Marie Schatteman, Wemmel, Belgium, assignors to Staar, S.A., Brussels, Belgium, a corporation of Belgium
Filed Oct. 31, 1966, Ser. No. 590,613 Claims priority, application Belgium, July 8,1966, 30,628
U.S. CI. 242—55.13 11 Claims
Int. CI. Glib 15/32
ABSTRACT OF THE DISCLOSURE
A stop system particularly useful with tape cartridge recorder-players and designed automatically to disengage the drive elements of a tape deck from the tape whenever tape motion is stopped. The system is responsoive to stoppage due not only to the complete unreeling of the tape from the supply reel, as well as to breakage of the tape but to stoppage due to the interruption of electric power to the player-recorder as well.
This invention relates to apparatus for the recording and playback of sound from a magnetic tape in a selfcontained cartridge or cassette. More particularly, the invention concerns automatic disengagement of certain tape recorder drive elements from the tape when the machine is stopped to prevent possible damage to the drive elements and to the tape itself.
An important advantage of cartridge-loading tape recorders is that loading and removing the tape from the machine is greatly simplified. Certain driving elements of the tape deck mechanism must, however, enter the cartridge to provide means for controllably driving the tape past the sound head. If the commonly-used capstan and pinch roller drive system is employed, one of these elements must pentrate the cartridge to engage the tape and the other element must be brought into position to pinch the tape between them. Tape transport spindles must also enter the reel hubs of the cartridges to provide tape tensioning and driving force when the machine is in operation.
A device for stopping the action of tape drive mechanism or initiating some other operation when the tape is no longer in motion is disclosed in my co-pending application Ser. No. 553,992, filed May 31, 1966, entitled Stop System for a Drive. Briefly stated, this system comprises a sensing means which detects the slowing or stopping of the tape reel spindle. Upon sensing this change in the rate of reel rotation, other circuit elements are actuated to perform whatever function may be desired, such as rewinding of the tape or stopping of the tape drive elements.
When cartridge-loading tape decks are adapted for use with other sound equipment, such as car radios, television sets, and audio equipment having sound systems through which the tape decks are operated, power for operating the tape deck is generally derived from the electrical system of the associated equipment rather than from self-contained batteries or from any other independent source. The power to the tape deck is thus subject to interruption from switches in the circuitry of the associated equipment as well as those of the tape deck itself, and if such interruption occurs while the tape deck is being operated, the tape drive elements will remain engaged with the tape, and damage to both the drive elements and the tape may result from the prolonged pressure and contact in the engaged position. If the commonly-used capstan and pinch roller drive system is employed, there is the possibility that the continued pres
sure of the capstan on the pinch roller in one place will cause the pinch roller to develop a flat spot, or otherwise lose the concentricity which is essential to proper operation.
5 The present invention has particular, but not exclusive utility in tape decks having a drive carriage shiftable with the tape cartridge between released and operating positions and which carries the capstan and reel spindles into drive relation with the tape and reel hubs in the
Iq cartridge. A tape deck having these features is disclosed in co-pending application of Theophiel C. J. L. Staar for a Tape Deck, Ser. No. 567,115, filed July 22, 1966.
During the operation of tape decks of the type described, it is often desirable to stop the action of the
15 tape drive mechanism when the supply reel has been emptied. If this is not done, the drive mechanism will continue to run even though no more tape remains on the reel. If the trailing end is securely fastened to the supply reel, the motion of the tape past the still-moving
20 drive elements will be arrested with the attendant risk of excessive wear from slippage of the drive elements and the tape itself as the drive elements continue to exert a pulling force on the motionless tape and the inconvenience of the circuit continuing to run without any
In view of the foregoing, it is a principal obqect of the resent invention to provide a stop system for tape decks which will positively disengage the drive elements of the tape deck when the power supply is interrupted by 30 any means, particularly means other than the normal controls of the tape deck itself. It is further intended to achieve such a system which is adapted for use with tape decks of the sort employed in motor vehicles in which the power supply for such accessories is separately con35 trolled by a master switch, such as an ignition switch. Another object of the present invention is the provision of a stop system of the type described for use with tape decks having a shiftable drive carriage which carries the various drive elements into engagement with a car40 tridge to drive the tape past a sound head, with operation of the deck being initiated by the mere insertion of the cartridge by the operator. Provision is also made by which the stop system of the present invention is effective not only to disengage the various drive elements from the 45 tape cartridge, but to return the cartridge to a released position where it may be withdrawn by the operator.
Other objects and advantages of the invention will become apparent upon reading the following detailed description and upon reference to the drawings, in which: 50 FIGURE 1 is a plan view of the tape deck mechanism of the present invention with a tape cartridge shown in position for recording or playback, and with the associated electronics and exterior covers of the machine being omitted for clarity; 55 FIG. 2 is a section taken in the plane 2—2 of FIG. 1; FIG. 3 is a section taken in the plane 3—3 of FIG. 1, with the released position of the drive carriage being shown in phantom; FIG. 4 is a plan view of the tape deck of FIG. 1 with 6^ the cartridge and drive carriage in the released or inoperative position;
FIG. 5 is a schematic circuit diagram of the stop system of the present invention with the drive carriage latch release mechanism illustrated in fragmentary per65 spective; and
FIG. 6 is a fragmentary perspective similar to that of FIG. 5, in which the drive carriage is illustrated in the released position.
While the invention will be described in connection with a preferred embodiment, it will be understood that I do not intend to limit the invention to that embodiment,