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US 4,497,270 AGranted
Method and apparatus for sewing elongated fabric piece
AssigneeYoshida Kogyo K.K.
InventorRonald J. Boser
Life of this patent
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AssigneeYoshida Kogyo K.K.
InventorRonald J. Boser
Estimating the term…
An automatic apparatus for sewing elongated workpieces, and especially useful for precisely sewing a pair of concealed slide fastener stringers to a pair of fabric halves defining the opening therebetween comprises a table having fabric input guides at the front end of the table, a sewing station, and a gripper assembly for drawing the fabric pieces from the sewing station under a tension less than that applied by the sewing machine feed dog and presser foot. Individually actuable workpiece holders are provided to permit successive setting up of the fabric pieces in the sewing station. Fastener stringers are guided to the sewing station with their corded edges supported in guide channels as the stringers are superposed on the respective fabric piece. The sewing operation proceeds automatically in an extremely precise manner after the sewing station is inputed and the sewing machine started.
Apparatus for sewing elongated workpieces comprising a table on which is mounted guide surface means at a front end of said table, a sewing machine disposed intermediate of said table, and a releasable gripper means disposed via drive means for linear back and forth movement between respective forward and rearward stroke positions adjacent said sewing machine and outward away from the rear end of said table, said sewing machine having feed means for conducting a workpiece from said guide surface means, through said sewing machine, and toward said gripper means during operation of said sewing machine, said gripper means engaging a lead end of said workpiece and said drive means drawing said gripper means rearwardly under tension less than that applied to said workpiece by said feed means.
Automatic apparatus for sewing a pair of slide fastener stringers to a pair of elongated fabric halves comprising a table on which is mounted an upstanding linearly directed guidewall at a front end of said table, a double-needle sewing machine disposed intermediate of said table having feed means for receiving and conducting said pair of fabric halves from along sides of said guidewall, beneath said sewing machine needles, and toward a rear end of said table, a releasable gripper means disposed via drive means for linear back and forth movement between respective forward and rearward stroke positions adjacent said feed means and outward away from the rear end of said table, said gripper means gripping respective lead ends of said fabric halves simultaneously, an inclined guideway means for conducting a separated pair of slide fastener stringers downward toward said feed means for respective superposed placement onto said pair of fabric halves, and said drive means draws said gripper means rearward during operation of said sewing machine at a tension less than that applied to the fabric halves by said feed means.
A method for operating an apparatus for automatically sewing elongated workpieces, said apparatus comprising a table on which is mounted a linearly directed, upstanding guidewall at a front end of said table, a sewing machine disposed intermediate of said table, and a releasable gripper means disposed via drive means for linear back and forth movement between respective forward and rearward positions adjacent said sewing machine and outward away from said rear end of said table, said sewing machine having feed means for conducting a workpiece through said sewing machine in a rearward linear direction, said method comprising:
A method for sewing a pair of slide fastener stringers to a pair of elongated fabric halves comprising:
Dependencies are inferred from the claim text.