Patent GB-191514752-A (GB)
Title: Improvements in the Manufacture of Lace Net and in Machines therefor.
Inventor: GEISENDORFER FRANCIS
IPC: D04C5/02
Filed: 1915-10-19
Abstract: 14,752. Geisendorfer, F. Oct. 19. Lace.-In wire net composed of vertical pillars A, Fig. 2, and diagonal pillars B, C running left to right and right to left respectively, each pillar is composed throughout of the same warp thread and bobbin thread twisted together, the pillars being interlaced where they cross. Lace-machines.-Three tiers of bobbin carriages are employed, the central tier 1, Fig. 1, having no progressive movement along the machine, whilst the front and back tiers 2, 3 contain only half the number of carriages and have a progressive movement, the front tier from left to right and the back tier in the opposite direction. This movement is produced by the shogging or traversing of the back set of combs 5. A set of stationary warp threads d, e drawn from the beam 42, and a set of traversing warp threads f, g drawn from bobbins 60 on carriages 61 running on guides 48, 49 and moved by endless chains 62 with projections to engage holes in the carriages, are twisted with the bobbin threads a, b, c from the central tier and from the front and the back tiers to form the pillars of the net. The net is complete in six complete movements of the three tiers of carriages or in eighteen motions of a set of bobbin threads through the warps. At the completion of a cycle of movements, the transversing warp and bobbin threads have moved through two carriage spaces. The movement of the threads to produce the net is shown in Fig. 3. The front and back tiers may, for some nets, contain a full complement of bobbins. The tiers of carriages are moved up close together in the combs 4, 5, but are opened out whilst passing through the warps. The inner rolling lockers 9, 10, are driven from an external toothed sector 12, Fig. 11 rocked by a crank and connecting- link from the main shaft, whilst the outer rolling lockers 8, 11 are driven at a slower speed from an internal toothed sector 19 similarly operated. The tiers of carriages, when passing the outer lockers 8, 11, have their end teeth j close together, and the lockers are provided with a space k between two teeth to accommodate the teeth j at the same time. To return the front and rear tiers of carriages from their extreme positions into engagement with the rolling lockers 8, 11, bars 38, 39 are provided carried by links 27 supported at one end by links 28 pivoted to the framework, and at the other end by levers 31 pivoted to the cradles 33, which carry the comb bars 40. The bars 38, 39 are operated by cams 36. The transference of the carriages from the front tier to the rear tier, and vice versa, as they come to the ends of the tiers is accomplished by turn-again sections on the rolling lockers 9, 10. The stationary warp threads d, e are passed up through a fixed plate 43 to guide-bars 6, 7, Fig. 8, supported between fixed bars 58, 59 supported on brackets 44, 45. The guide-bars 6, 7 are actuated by the cam 53, Fig. 11, through the bell-crank levers 52, 50 and link 51. The front and rear traversing warp threads f, g are carried up outside the bars 58, 59 and are controlled by point bars 66 and auxiliary point bars 67. The bars 66 are shogged to act as traversing thread-guide bars, the threads being engaged by the auxiliary bars 67 to hold them in position while the bars 66 are withdrawn and returned to their original position. The point bars 66, 67 are carried by brackets 68, 69 mounted on bars 70, 71, Fig. 1, secured to links 72, 73 pivoted to levers 74, 75, which are engaged by a lever 76 rocked by a cam 77. This arrangement may be duplicated, point bars 91, 92 co-operating with the plate 43. The threads are moved from the back to the front bar, and vice versa, at the ends of the machine by fingers 80, Fig. 11, operated by a cam 82. The thread is retained in position by a, fixed bar co-operating with the ends of the bars 58, 59. The point bars 66, 91 are operated by cams 90, 95, Fig. 11, respectively through levers 93, 96.