Patent GB-341993-A (GB)
Title: Improvements in magazine talking machines
IPC: G11B17/16
Filed: 1929-10-30
Abstract: 341,993. Magazine gramophones. GRAMOPHONE CO., Ltd., Hayes, Middlesex, THOMPSETT, H. A., 26, Castlebar Park, Ealing, London, and CHIFFEY, E., 48, Corbins Lane, South Harrow, Middlesex. Oct. 30, 1929, No. 33019. [Class 40 (ii).] A magazine gramophone embodying mechanism for reversing the position of a record in the playing position to permit both sides to be played and a selector device adapted to be set to pre-determine which of the records it is desired should be played from one side and which from both sides, is provided with means controlled by the selector device for transmitting the drive of the motor either to mechanism for feeding a record to the turntable or to mechanism for reversing a record. A dial plate 36, mounted on a rotatable shaft 37, is provided with a set of knobs 38 which are carried at the upper ends of pins 39, and, with the exception of one (numbered 0), are arranged to be depressed in sleeves 40 in the dial plate. The number of knobs 38 is arranged to be one greater than the maximum capacity of the magazine. In operation, the dial is turned so that the knob 38 bearing the number corresponding to the number of records in the magazine is in position A, Fig. 2, and the effective knobs are arranged to be elevated or depressed according as playing of one or both sides respectively of a record is required. Discs 42 are mounted on the lower ends of the pins 39 and these are adapted, when the knobs are depressed to lie in the same plane as a lever 28 which is arranged to control clutch mechanism for changing the drive of the motor from the record-transferring mechanism to the record-reversing mechanism or vice versa. At the commencement of operation, the knob 38 in the position B, Fig. 2, is elevated so as not to affect the lever 28, and the clutch mechanism is then in position to couple a sleeve 6, Fig. 1, carrying cams 7, 8, 9, which operate recordtransferring members, with a cam shaft 3 driven through a main clutch by the motor. The cam shaft 3 is rotated for a given period until such time as the main clutch is automatically moved out and during this period the various automatic operations such as the moving of the sound arm, the feeding of a record, the ejection of a played record, and the reversing of a played record are effected. During each cycle the cam 7 contacts with a bell-crank lever 45 provided with a pivoted pawl 50 so as to cause the latter to engage one tooth 44 of a ratchet wheel 43 mounted on the dial shaft 37 and to rotate the said shaft and dial plate a distance sufficient to bring the next knob into operative position. If this knob is in depressed position the disc 42 on the same will engage the lever 28 so as to effect, by means of clutch mechanism, the transfer of the motor drive to a sleeve 20 carrying a cam 21 for setting recordreversing mechanism into operation, but if the knob is in raised position the record-transferring mechanism will operate to feed the next record from the stack after the played record has been ejected. The tone-arm is moved to cause the stylus to engage the outermost groove of a record on the turntable by means of a cam 5 moving with the shaft 3. The cam 5 carries a projection 58 adapted to engage a spring-controlled lever 54 and return a depressed knob 38 to normal position. The clutch mechanism for coupling the sleeves 6, 20 with the shaft 3 comprises a member 16 having flanges 17, 18 and fixed on the shaft 3 between the sleeves 6, 20. A notch on the flange 17 is adapted to be engaged by a spring-pressed lever 12 on a plate 10 at the end of a sleeve 6, and a similar lever 23 on the sleeve 20 engages a notch on the flange 16. Two levers 30, 34, connected by a link 33, co-operate so that when one sleeve is clutched to the shaft the other is out of action. Normally, a spring causes the sleeve 6 to be clutched to the shaft 3. The lever 30 is fixed on a rotatable shaft 29 controlled by the lever 28. Specifications 291,480, 317,357, 317,358, and 330,645, [all in Class 40 (ii), Phonographs &c.], are referred to.