摘要:
A spar for an airfoil comprises a core, e.g. a foam core, a central structural member extending through the core, an outer structural layer surrounding the core and central structural member and a plurality of yarns extending through the central structural member.
摘要:
A sewing machine for the production of edge-parallel seams on layers of sewing material which includes a reciprocating needle which is movable through a stitch-forming station and a material feed for advancing the materials in a feeding direction through the station. The guide means for the material comprises a plurality of plates arranged in spaced vertical relationship one above the other and defining at least two separate material feed paths between adjacent plates. Each feed path has its own end guide or rule for the edge of the material which extends along a line extending laterally in a feeding direction through the needle axis. The construction includes an adjustable pressure member and a counterplate for applying and releasing pressure from materials being fed which is located at a spaced location from the end guides or rulers. One of the end guides comprises a slide having an edge defining the guide which is movable by sensing means which senses the end of one or more of the materials and positions the guide accordingly.
摘要:
The throat slot, arranged in the needle plate for the passage of the needle, has in the right front portion thereof a groove. It is designed to retain the previously formed thread chain and prevent the formation of the overlock stitch until displaced by the passage of a fabric.
摘要:
A latch needle is disclosed with a sliding bolt of unique construction which is easily manufacturable and which serves with particular effectiveness in accordance with this invention in carrying out blindstitch sewing.
摘要:
Force is delivered from a looper drive crank to a nut and bolt assembly having clamped thereto the inner races of first and second bearing sets. A spacer separates the bearing sets. The outer races of the bearing sets are press fit into the bore of a housing from which force is transmitted to a looper link.
摘要:
An overedge sewing machine including a main input shaft and an auxiliary shaft mounted at right angles to the main shaft and driven thereby through a miter gear set. The machine''s needle carrier, upper and lower loopers, feed dogs, and material cutter are driven by said shafts through planar connecting rods. A shaft mounted pump supplies oil through the shaft to main shaft bearings and to the scotch yoke drive of the feed carriers. The feed carrier drive includes means for stabilizing the feed dogs and for shifting the feed carriers to provide an improved, efficient feeding path.
摘要:
Vibration and noise reducing features are provided in a blindstitch sewing machine and its supporting means, thereby enabling the machine to perform proper stitching at much higher speeds. Includes reduction in size and weight of connection from a rotary drive shaft to a node former for oscillating the latter. Use of toothed pulleys and belt connections from a main drive shaft to two rotary members on stationary or non-rotary shafts, which members serve to operate various devices within the machine to enable it to produce a continuous series of regular, non-skip stitches of seams involving both skip stitches and non-skip stitches, by appropriate adjustment of certain parts. Involves also the provision of special means for mounting the sewing machine on a supporting table and securing the machine thereto. Means are included in the machine structure for firmly retaining both ends of an eccentric shaft which serves to support and control the movement of a looper during stitch forming operations. This has also required changes in the form of the feed bar employed.
摘要:
A SEWING MACHINE FOR OVERCASTING THE EDGES OF TWO SUPERPOSED FABRIC PLIES EACH WITH A SEPARATE OVERCASTING THREAD AND FOR FORMING A SINGLE LINE OF SECURING STITCHES WHICH SIMULTANEOUSLY UNITES SAID SUPERPOSED FABRIC PLIES AND ANCHORS SAID SEPARATE OVERCASTING THREADS.