Patent GB-359106-A (GB)
Title: Improvements in talking machines
IPC: G11B17/02
Filed: 1930-08-18
Abstract: 359,106. Magazine gramophones. GRAMOPHONE CO., Ltd., Hayes, Middlesex, THOMPSETT, H. A., 26, Castlebar Park, Ealing, London, and CHIFFEY, E., 48, Corbins Lane, South Harrow, Middlesex. Aug. 18, 1930, No. 24710. [Class 40 (ii).] Gramophones of the type wherein records are fed singly from the bottom of a pile arranged above the turntable to the playing position on the turntable are provided with main and secondary record supports 38, 42, which are moved inwards and out. wards either relatively to one another to effect release of a record to be played or in unison into one or other of several positions to support a pile of records of given size. Two main record supports 38 are arranged at diametrically opposite sides of the turntable 3 and each consists of a flat plate pivoted at each end to a pair of links 37 which are pivotally mounted on pivot pins 35, 36. Each secondary support 42 is pivoted at 44 to a channelshaped member 41 which is pivoted on the pivot pin 35 and encloses the links 37. The movement of each secondary support is limited in one direction by stops 46 and in the other direction by an extension 45 of the support engaging the upper edge of the corresponding member 41. In the normal position, the secondary members 42 are so spaced above the main members 38 that their leading bevelled edges 47 lie opposite the slight recess formed between the edges of the two lowermost records in the pile on the supports 38. The record supports 38, 42 are adapted to be operated by a sliding bar 49, which is provided with elongated slots 55 engaging the turntable spindle 2 and a fixed pin 56 respectively and is reciprocated by a 50 link having rollers 52, 53 co-operating with a cam 54 on a control shaft 13. A rod 59 extending between one pair of links 37 of each main record support 38 is connected to the bar 49 at one side of the turntable spindle 2 by a lever 58, and a pin 62 extending between the side walls of each of the channel-shaped members 41 supporting the secondary supports 42 is connected to the bar 49 at the other side of the spindle by a link 61. The rods 58, 61, which are each pivoted to clips on a rod 59 or pin 62 respectively may be formed of two parts joined by pin-and-slot connections 63. The control shaft 13 is driven from a gear wheel 10 fixed to a disc 9 which is adapted to be clutched to the turntable spindle by a pivoted clutch 7 under the action of a lever 8 by a reversal of the direction of movement of the pick-up arm 5 when the stylus enters an eccentric groove at the end of a record. The cam 54 on the control shaft 13 moves the bar 49 so that the levers 58 cause the main record supports 38 to be moved apart, and the levers 61 cause the secondary supports 42 to approach one another. The lowermost record is then freed so as to fall by gravity on to the turntable, being guided by a pin 48 which is detachably mounted in a socket in the turntable spindle 2. Further action of the cam 54 returns the main supports 38 and withdraws the secondary members 42. In order that the initial position of the two sets of supports may be adjusted according to the size of records to be played, the pivot pins 35, 36, carrying the supports 38, 42, levers 37, and member 41, are mounted on slides 31 which may be adjusted in position by a handlever 66 adapted to rotate a ring 65 connected by links 68, 69 with the slides 31. Each time the clutch 7 is engaged, the cam shaft 13 is rotated one revolution so as to effect release of a record and also raise the pick-up 4 to disengage the needle from the played record, swing the pick-up arm 5 outwards, return the pick-up arm 5 to a position over the edge of the new record, and then lower the pick-up on to this record. The pick-up arm 5 is mounted on a horizontal axis in trunnion bearings 21, Fig. 1, which are movable on a vertical axis. The swinging of the pick-up arm 5 is effected by a cam 23 on shaft 13 co-operating with rollers 24, 25 on a lever 26 which has a slotted end 28 engaging a pin 29 on an arm 30 rigid with a member carrying the bearings 21. A cam 17 on the shaft 13 is adapted to rock a lever 14 engaging a pin 19 on an arm 20 rigid with the pick-up arm 5 so as to raise and lower the pick-up 4. The pivot of the lever 26 may be carried by a lever 71 which is pivoted at 72 and is coupled by a link 73 with the ring 65 whereby operation of the hand-lever 66 simultaneously adjusts the supports 38, 42 and the throw of the lever 26 so that the pick-up arm may receive the correct swinging movement corresponding with the records being played. The Provisional Specification describes the secondary supports as being mounted on links on the pivot pins 35, 36 similarly to the main supports, and cams on the adjacent surfaces of the supports co-operate to rock the secondary supports so that they engage between the two lowermost records.