Abstract A lockseamer mechanism for trimming the free edge of cloth is disclosed, whereby a composite of knitted or woven cloth for men and women can now be easily fabricated at a high speed without requiring the full time attendance of a shopworker. A lockseamer generally employs three independent threads which are supplied to conventional sewing machine needles. Cloth to be lockseamed along a lengthwise edge is first led to an initial guide gauge having a guiding edge and made of stainless steel sheet. Adjacent thereto a principal guide gauge is provided and has a guide edge adapted to handle any type of curve, including outside curve and inside curve, as well as straight edges. A pair of high pressure jet nozzles are provided to press the cloth sideways against the guide edges. Electric eyes, responsive to the incoming cloth, actuate a third nozzle to advance the cloth towards the sewing machine needle. When lockseaming of the cloth is completed, the thread is automatically cut off and the cloth is moved and then removed from the edge of the sewing table.
An improved lockseamer mechanism for use with a three thread type of sewing machine having a body and a needle, comprising: a principal guide gauge formed of thin stainless steel sheet and removably coupled to said sewing machine body, said principal guide gauge being adapted to guide cloth having a straight edge or an edge curved in either direction; a table, said sewing machine being positioned on said table, said table having permanent magnets buried therewithin; a supplementary guide gauge formed of thin stainless steel sheet and supported on said table by said permanent magnets; a plurality of air jet nozzles mounted adjacent said principal guide gauge and operatively directed thereto; an adjustable source of compressed air coupled to said nozzles, air streams being thereby directed toward said principal guide gauge for positioning cloth therewithin; an electric eye positioned between said principal gauge and said sewing machine needle and operatively coupled such that said needle operates when said electric eye detects the presence of said cloth; vacuum means positioned behind said needle for attracting said cloth thereto; and a band roller positioned adjacent said principal guide gauge for advancing cloth having relatively large dimensions, whereby cloth can be automatically fed to the sewing machine once it is placed in the gauge.
Claim 2
Dependent Claim
211 words
An improved lockseamer mechanism for use with a three thread type of sewing machine having a body and a needle, comprising: a principal guide gauge formed of thin stainless steel sheet and removably coupled to said sewing machine body, said principal guide gauge being adapted to guide cloth having a straight edge or an edge curved in either direction; a table, said sewing machine being positioned on said table, said table having permanent magnets buried therewithin; a supplementary guide gauge formed of thin stainless steel sheet and supported on said table by said permanent magnets; a plurality of air jet nozzles mounted adjacent said principal guide gauge and operatively directed thereto; an adjustable source of compressed air coupled to said nozzles, air streams being thereby directed toward said principal guide gauge for positioning cloth therewithin; an electric eye positioned between said principal gauge and said sewing machine needle and operatively coupled such that said needle operates when said electric eye detects the presence of said cloth; vacuum means positioned behind said needle for attracting said cloth thereto; and a band roller positioned adjacent said principal guide gauge for advancing cloth having relatively large dimensions, whereby cloth can be automatically fed to the sewing machine once it is placed in the gauge.