Patent GB-190617992-A (GB)
Title: Improvements in Repeating Attachments for Phonographs.
Inventor: AIKEN EDWARD LINCOLN
Filed: 1906-08-10
Granted: 1907-07-11
Abstract: 17,992. Aiken, E. L. Oct. 31, 1905, [date applied for under Patents Act, 1901]. Phonographs. - Phonograph repeating - attachments, of the type wherein the feed-nut is disengaged from the feed - screw by means of a rotating lifting-pin engaging a contact-member carried by the sound - box, are provided with a device by which the overlap of the lifting-pin with respect to the contact-member is increased. This obviates the necessity for accurate setting, so that unskilled persons may apply the device to phonographs. A base-plate 7, Figs. 1 and 2, carrying the repeating-attachment, is adjustably secured to the bed-plate of the phonograph by screws 8. It carries bearings 10 having mounted therein a return screw 12 of coarse pitch, driven from the main shaft 2 by gearing 13. An arm 15, secured to the split collar 14, projects in front of, and in line with, the spring arm 5. A contact-member 16 is pivoted to the arm 15, so as to be capable of longitudinal and transverse oscillation in the plane of the axis of the return shaft, and is adapted to be engaged by a pin 22 rotating with the shaft, whereby the feed - nut is disengaged and the carriage is rapidly returned to its initial position. The two axes of oscillation are secured by forming the dog with ears 17, 18, Fig. 6, having openings 19, 20 through which passes a pin 21 rigid with the arm 15. The opening 19 is slightly larger than the pin 21, the opening 20 is considerably larger, and the distance between the ears is greater than the width of the arm 15. A member 16 has a side shoulder 22, a bottom rib 23, and a tail 24. A disk 28 carrying a pin 29 is mounted on the return shaft and may be adjusted by a set-screw 28<a>, which presses against a block 43 having a rib 43<a> which engages the screw - thread. An inclined rod 25 held by a set-screw 27 in a boss 26 on the plate 7 engages the tail 24 to lower the e carriage. The operation of the device is as follows : While the feed-nut engages the feed-screw 2, the member 16 hangs idly on the pin 20. As it approaches the lifting-pin 29, the shoulder 22 intersects the path of this pin, the extent of overlap being less than the pitch of the screw. When the two come into contact, the member 16 is turned slightly on its transverse axis, thus increasing the overlap of the shoulder 22 with respect to the pin 29. At the end of this movement the member 16 and the arm 15 are lifted, and the member 16 is carried forward until the rib 23 engages the return screw. When the tail 24 reaches the rod 25, the member 16 is thrown from engagement with the return screw and the carriage falls to its operative position. In Fig. 7, the member 16 is shown connected to the arm 15 by a pin 20<a> rigid with the ears 17, 18 and journaled in a conical bearing formed in the arm 15 ; as shown in Fig. 8, it is pivotally connected to a pivoted block 31. In a modification, Fig. 11, the increased overlap is obtained by substituting a pivoted pawl 36 for the shoulder 22. In Fig. 13 the disk carrying the pin is pivoted to a sleeve 40 by trunnions 41. The pin has a sloping surface 44 which engages a similar surface 45 of the member 16, thereby turning the disk and increasing the overlap. As shown in Fig. 14, the disk 28<2> carries a pawl 45, pivoted on an axis 46 and held in position by a spring 47. On striking the shoulder of the member 16, the pawl turns on its pivot, thereby increasing the overlap.