Patent GB-730802-A (GB)
Title: High-speed sewing machine with pressure feed lubrication
IPC: D05B71/00
Filed: 1952-10-27
Abstract: 730,802. Lubricating. HESS, O. Oct. 27, 1952 [Oct. 27, 1951], No. 26926/52. Class 12 (3). [Also in Group VII] In a high speed sewing machine with pressure feed lubrication there are provided at certain points of the machine housing several oilcollecting surfaces arranged one outside the other, the surfaces being sloped inwardly so that oil therefrom is returned to the inner spaces of the housing. Inlet openings are provided in the lower part of the housing for cold air and outlet openings are provided in the upper part of the machine for heated air with means for keeping back oil mist. In the construction shown in Fig. 3, the sewing machine comprises two sections 1, 3, the section 1, carrying the needle bar 5, having two compartments 1<SP>1</SP>, 1<SP>11</SP>. The compartment 1<SP>1</SP> has an opening 2 closed by a detachable wall 6, and the compartment 1<SP>11</SP> has an opening 52 closed by a detachable wall 13. A space 53 separates the walls 6, 13 from a cover 10 hinged to the section 1. Any oil seeping from the compartments 1<SP>1</SP>, 1<SP>11</SP> into the space 53 flows back towards the bottom of the compartment 1<SP>11</SP>. Oil collecting in the compartment 11 flows through an opening 9 to the compartment 1<SP>11</SP>. Below the hinge 11 of the cover 10 is an air inlet 38, the air passing up from compartment 1<SP>11</SP> to compartment 1<SP>1</SP> through the opening 9 and seeping to the space 53 through an opening 39 and to atmosphere through an opening 80 provided with a labyrinthine passage in which oil is deposited. A cloth-cutting knife 72 is carried by an oscillating lever 35 which passes through an opening 67 in the compartment 1<SP>11</SP> and is pivoted at 70. The lever 35 is provided with a bent plate 37 which prevents oil from passing out through the opening 67. Feed bars 26 supporting feed dogs 73, 74 are operated by means of a lifting rocker 45 and a rock-shaft 43 connected directly to one feed bar and indirectly to another feed bar by means of a wing 44 to which a lever 75 is linked at 76. The other bar of the lever has an eye 77 linked to a cross-slider 78 connected to the feed bar. Oil collected by the lever 75 and the eye 77 is deflected downwardly by a nose 79. The lower section 3 of the casing is divided into two parts, one part 311, Fig. 8, having parts 57 for driving the looper shaft from the main shaft 15. A cover 16 forms an oil-collecting device and outside this cover ia another cover comprising the cloth-collecting plate 17 having a vertical wall 17<SP>1</SP>. Oil getting into the intermediate space 18 drains back to the compartment 3<SP>11</SP> through a sloping passage 19. In the arrangement shown in Fig. 9 an angular sheet metal cover 25 with edges 28 is provided above the feed bars 26, and above this cover is a detachable stitch plate 29. Sealing of lubricant between the upper section 1 of the casing and the lower section 3 is provided by two grooves 30, 31, Fig. 13, the groove 30 having an elastic packing 30<SP>1</SP> and the groove 31 having channels 32 which may serve to lead oil back to the lower section, and to admit cool air.