Automatic pocket opening sewing machine having a cutting device for producing notching cuts
First Claim
1. An automatic pocket opening sewing machine having a cutting device for producing two notching cuts at ends of the pocket entrance:
- the sewing machine comprising a sewing needle and means for operating the needle for sewing sewn parts passing by the sewing needle;
means for first clamping to the sewn parts and for then advancing the sewn parts in an advancing direction past the sewing needle;
the cutting device comprising two knives arranged in sequence downstream of the needle in the advancing direction of the sewn parts, and the knives being disposed above a surface of the sewn parts;
a respective operating device for each knife for moving the knife to a cutting position for making a respective gusset cut in a sewn part;
the knife nearer to the sewing needle being stationary along the direction of advance of the sewn parts;
the knife further from the sewing needle being movable toward the stationary knife for adjusting the spacing between the movable and stationary knives for making cuts which are desirably spaced apart;
means for temporarily engaging the movable knife and for moving the movable knife counter to the direction of advance of the sewn parts and toward the stationary knife for establishing the desired spacing of the cuts to be made by the stationary and movable knives.
2 Assignments
0 Petitions
Accused Products
Abstract
A pocket opening sewing machine including a cutting device for producing two notching cuts at the ends of a pocket opening. The sewing machine has sewing needles and a belt driven clamping device for clamping to the sewn parts for advancing them in an advancing direction. The cutting device includes two knives spaced apart. The knife that is further from the sewing needles is movable toward the stationary knife that is closer to the needles. For adjusting the spacing between the knives, the movable knife is temporarily clamped to a moving belt which moves it toward the stationary knife. An adjustably positionable stop defines the furthest limit of spacing between the stationary and movable knives and a spring drives the movable knife against the stop. The clamping of the movable knife to the belt is initiated by a sensor which senses the passage of a sewn part and which operates a microcomputer with pocket length information stored in it to move the movable knife when required over the distance required. Alternately, if the movable knife moves at a speed faster than the advancing speed of the sewn parts, adjustment of the movable knife stop can be dispensed with.
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Citations
14 Claims
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1. An automatic pocket opening sewing machine having a cutting device for producing two notching cuts at ends of the pocket entrance:
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the sewing machine comprising a sewing needle and means for operating the needle for sewing sewn parts passing by the sewing needle;
means for first clamping to the sewn parts and for then advancing the sewn parts in an advancing direction past the sewing needle;the cutting device comprising two knives arranged in sequence downstream of the needle in the advancing direction of the sewn parts, and the knives being disposed above a surface of the sewn parts;
a respective operating device for each knife for moving the knife to a cutting position for making a respective gusset cut in a sewn part;the knife nearer to the sewing needle being stationary along the direction of advance of the sewn parts;
the knife further from the sewing needle being movable toward the stationary knife for adjusting the spacing between the movable and stationary knives for making cuts which are desirably spaced apart;means for temporarily engaging the movable knife and for moving the movable knife counter to the direction of advance of the sewn parts and toward the stationary knife for establishing the desired spacing of the cuts to be made by the stationary and movable knives. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification