Patent GB-524267-A (GB)
Title: Improvements relating to record-changing apparatus for gramophones and the like
IPC: G11B17/00
Filed: 1939-01-25
Abstract: 524,267. Magazine gramophones. FORTUNE, H. J., and GARRARD ENGINEERING & MANUFACTURING CO., Ltd. Jan. 25, 1939, No. 2564. [Class 40 (ii)] Relates to magazine gramophones of the kind in which the records are held up by an edged support with or without a central stepped post as in Specification 450,966 and are dropped on the turntable one at a time by the reciprocation of the edge support. According to the invention, a link adjustable in length is provided in the reciprocating mechanism to adjust the position of the edge support according to the diameter of the record. Means are also provided for simultaneously adjusting the starting position of the pick-up arm. As shown in plan in Fig. 1 and elevation in Fig. 2, the edge support 1 is carried by a frame 4 slidably mounted on a rod 5 and provided with a side pin 6 adapted to be engaged by one or the other of two ratchet-like notches 7 in a link 8, which is pivoted to a bell-crank 9 co-operating with a cam 12. The ratchet link 8 is urged down into engagement with the pin 6.by a spring 13, the sliding frame 4 is urged outwards by a spring 14, and the bellcrank 9 is held against the cam 12 by a spring 26. One notch 7 is for 10 inch records, and the other for 12 inch records. To adjust the ratchet link, a handle 17 is provided on a lever 15 pivoted at 16 and having another arm 19 to which is pivoted a link 20 formed with a slot in engagement with a pin 21 on the sliding frame 4. The arm 19 has also an extension 22 co-operating with a lever 23 pivoted on the pin 6 and provided with a pin 24 in engagement with a groove 25 in the link 8. In the position shown, the apparatus is set for 12 inch records. To change over to 10 inch records, the handle 17 is moved to the left end of a slot 18, Fig. 1. The link 20 draws the sliding frame 4 inwards and the pin 6 slips out of the outer notch 7 and into the inner notch 7, the slot 25 permitting this movement. To return to 12 inch records, the handle 17 is moved back to the right end of slot 18 ; the extension 22 of the arm 19 then rocks the lever 23 upwards, the link 8 is lifted off the pin 6, the frame 4 is moved outwards by its spring 14, the lever 23 escapes from the extension 22, and the link 8 is moved down again by its spring 13 to engage its outer notch 7 with the pin 6. Pick-up arm control device. The starting position of the pick-up arm is automatically controlled in accordance with the position of the handle 17 by means of an arm 27 connected by a link 28 to a lever 29 carrying a cam 31 co-operating with a lever 32 freely pivoted on a mounting 33, Fig. 3, about the vertical axis of the pick-up arm 34. Another lever 36 coupled to rotate with the pick-up arm is connected by a spring 37 to the lever 32 to hold a shoulder 38 on the lever 36 against the side of the lever 32. At the end of the playing of a record, the pick-up arm is lifted by a rod 44 resting by a friction disc 45 on a friction disc 46 adapted to be lifted by a lever 47 co-operating with a cam 50. Then another cam 39 acting through a lever 41 on the lever 36 turns the pick-up arm outwards ; and during this movement, the lever 32 is stopped by the cam 31 and the spring 37 stressed. After this the cam 39 allows the inward return of the lever 36 under the action of the spring 37 until the shoulder 38 is stopped by the lever 32. Finally, the pick-up is lowered again at the position determined by the cam 31, that is over the starting groove of the record. The friction between the discs 45, 46 prevents irregular movements of the pick-up arm during these operations. When the needle re-engages a record, the friction discs separate and the pickup is free to swing inward.