Multiple stroke looper mechanism for stitching machine
First Claim
1. In a machine forming stitches in a base fabric, including means supporting a base fabric for longitudinal movement in a fabric plane through the machine, a needle bar on one side of the fabric plane, at least one needle mounted on the needle bar and adapted to carry a yarn through the base fabric, needle drive means for reciprocally moving the needle bar toward and away from the fabric plane to move the needle in a needle path through the base fabric in a plurality of reciprocal needle strokes, each needle stroke constituting a stitch cycle, and means supplying yarn to the needle, a looper mechanism comprising:
- (a) a looper hook for each needle on the opposite side of the fabric plane from its corresponding needle and pointing in the direction opposite to the direction of the movement of the base fabric, and(b) looper drive means for reciprocally moving said looper hook across and proximate to the corresponding needle path for periodic seizure of a loop of yarn carried by a corresponding needle in a plurality of reciprocal looper strokes, the number of said looper strokes being a multiple of each needle stroke in a stitch cycle.
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Abstract
A method and apparatus for forming a longitudinal row of stitching in a base fabric with a reciprocal needle and cooperating looper, in which the looper is driven through two or more strokes for each stroke of the needle in a stitch cycle. In the preferred form of the invention, the looper points in the opposite direction from the longitudinal direction of movement of the base fabric, for the formation of either loop pile or cut pile stitching. When loop pile is formed, the stitching results in a chain stitch.
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Citations
13 Claims
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1. In a machine forming stitches in a base fabric, including means supporting a base fabric for longitudinal movement in a fabric plane through the machine, a needle bar on one side of the fabric plane, at least one needle mounted on the needle bar and adapted to carry a yarn through the base fabric, needle drive means for reciprocally moving the needle bar toward and away from the fabric plane to move the needle in a needle path through the base fabric in a plurality of reciprocal needle strokes, each needle stroke constituting a stitch cycle, and means supplying yarn to the needle, a looper mechanism comprising:
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(a) a looper hook for each needle on the opposite side of the fabric plane from its corresponding needle and pointing in the direction opposite to the direction of the movement of the base fabric, and (b) looper drive means for reciprocally moving said looper hook across and proximate to the corresponding needle path for periodic seizure of a loop of yarn carried by a corresponding needle in a plurality of reciprocal looper strokes, the number of said looper strokes being a multiple of each needle stroke in a stitch cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A looper hook for use in cooperation with a needle in a stitching machine, comprising:
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(a) a first hook blade having a shank and a first bill projecting from said shank and terminating in a pointed end portion, (b) a second hook blade having a shank and a second bill projecting from said shank and terminating in a pointed end portion, (c) means fixing said shanks side-by-side with said bills substantially parallel and pointing in the same direction, the pointed end portion of said first bill projecting farther in said same direction than the pointed end portion of said second bill, (d) said pointed end portions converging proximate to each other, (e) said second bill being flexible to permit movement of said second bill toward and away from said first bill, (f) said hook blades being spaced apart to permit the passage of a needle between said hook blades behind said converging pointed end portions (g) each of said bills having a bottom edge, and (h) a groove in each of said bottom edges, said grooves being transversely aligned for receiving and retaining a portion of a yarn loop seized on said hook blades. - View Dependent Claims (13)
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Specification