Patent GB-375642-A (GB)
Title: Lubricating system for sewing machines
IPC: D05B71/00
Filed: 1931-10-06
Abstract: 375,642. Lubricating sewing-machines. FAIRWEATHER, W. C., 65, Chancery Lane, London.-(Singer Manufacturing Co. ; Elizabeth, New Jersey, U.S.A.) Oct. 6, 1931, No. 27713. [Classes 12 (ii) and 12 (iii).] In a sewing-machine having a flatbed 1 with upwardly-projecting lugs supporting the main shaft 4 and the stitch-forming and feeding mechanisms, the under face of the bed is formed with an oil cavity 2 provided with a filling opening 109, Fig. 12, and the bottom of which is closed by a removable plate 3, oil being fed to the various parts by means of wicks rising through the bed from the cavity. The bed is secured in position on felt pads 113 by a screw 112 engaging a threaded lug 110, Fig. 13, on the plate 3. The shaft 4 is journalled in bushes 5, 27 in the lugs 6, 28, each bush having a longitudinal wick-filled channel 11, Fig. 1, in its.bearing surface communicating with a wickfilled cavity 12.in its outer surface to which oil is fed from the cavity 2 by a wick 13. Oil escaping from the end of the bush 5 is caught in an undercut groove 15 in the shaft collar 16 and passes through a duct 17 to the crank pin 18, whence oil passes through the pitman 19 to the pivotal connection between the pitman and an arm 21 fixed to a rock shaft 22 which is journalled in bushes 23 in the bracket arm 7 and to which is fixed an arm 22a actuating the needle-bar 9. Oil is supplied to one of the bushes 23 from a cup 24, Fig. 12, and passes to the other bush through a wick-filled axial bore 26 in the shaft 22. A pitman 54 mounted on a crank pin 55 on the end of the shaft 4 is pivoted to one arm 52 of a threearmed lever, the hub 48 of which is journalled on a pin 49 fixed in the bed lugs 51, another arm 45 of the lever carrying the overedge implement 33 while the remaining arm 44 is pivoted to a sleeve 42 embracing a pin 41 fixed in a boss 40 on the hub 35 of the looper carrier 34, the hub 35 being journalled on a spindle 36 fixed in a bed lug. The spindle 36 has a wick-filled channel 38, Fig. 12, supplied from the cavity 2 by a wick 39, and oil passes from the spindle through passages in the boss and pin to the surface of the latter. The crank pin 55 is lubricated through holes 58, 59, Fig. 13, by oil which escapes from the adjacent end of the bush 27. Oil from the crank pin passes through the pitman 54 to its connection with the arm 52. The pin 49 is also provided with wick-filled channels fed by wicks from the cavity 2, and oil is led from the pin through a duct in the arm 44 to the connection with the sleeve 42. The feed rocker 74, in arms 73 of which a pin 72 fixed to the rear end of the main feed-bar 69 is pivoted, is journalled on a spindle 75 fixed in the bed lugs 77, the spindle having wick-filled channels 85, Fig. 4, fed by wicks 87 from the cavity 2. Oil passes from the spindle to the pin 72 through ducts 88. Within the feed-lift and trimmer-actuating eccentrics 91, 92, Fig. 13, which are integral with each other, the shaft 4 is formed with a wick-filled channel 97 which conducts oil from the bush 27 to a duct 99 in the eccentric 92 and thence through the pitman 93 to the pin 102 connecting the pitman to the trimmer lever 94. Oil also passes from channel 97 over the end of the eccentric 91 to the surface thereof, whence it is carried to the eccentric 92 by a helical groove 100. The feed eccentric 80 is adjustably secured in a carrier 82 fixed to the shaft 4 and is lubricated through a hole 108<1> from an internal groove 108 fed by a duct 107 leading from an undercut groove 106 in the carrier 82 overhanging a wick-filled channel 104 in the side of a ring 103 mounted freely on the shaft 4 between the carrier 82 and the eccentric 92, oil being fed to the channel 104 from the cavity 2 through a wick-filled duct 105.