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US 6,205,821 B1Granted
Single- or multiple-feed circular stocking knitting machines
AssigneeSangiacomo S.p.A.
InventorFulvio Sangiacomo
Life of this patent
Estimating the term…
Abstract
A circular stocking knitting machine, in which, in addition to the knitting cams, two ascent and descent cams alternating depending on the direction of rotation are provided for the knitting operations with reciprocating motion. Two selection units, which select the needles during a same forward stroke of the cylinder, are additionally provided.
Claims12
A circular knitting machine, comprising:
- a grooved motor drive controlled cylinder, which is electronically operated to rotate with continuous rotating motion and with reciprocating motion, and to provide a signal which indicates the angular position of the cylinder;
- needles having a long bottom part mounted on half of the cylinder;
- needles having a short bottom part mounted on another half of the cylinder;
- a plurality of lower needles are associated with each of said needles having a long bottom part and said needles having a short bottom part through an intermediate pusher;
- a fixed shell having a series of cams provided around said cylinder, said cams controlling operating movements of said lower needles, said pushers and said needles having a long bottom part and said needles having a short bottom part, during the rotation of said cylinder;
- a thread-feed and knitting-formation station;
- selection units acting at least on said lower needles for an operating selection of said lower needles, said cams including adjacent bottom parts of said needles, a central cam, a right and left knitting cam, said central cam being arranged above and in an intermediate position between said right and left knitting cams, a right and left lateral cam for ascent and descent on opposite sides of said knitting cams, in a higher position than said knitting cams and lower than said central cam, a right needle ascent cam and a left needle ascent cam, on said opposite sides of said knitting cams, lower than said knitting cams and lower than said lateral cams, at said lower needles, at least one first selection unit of said selection units being provided with one said associated right lower-needle ascent cam and a second selection unit of said selection units being provided with one said associated left lower-needle ascent cam and a pusher ascent cam, said cams in said bottom parts of said needles being positionable to interact with said needles having a long bottom part, which do participate in the knitting with reciprocating motion, while said needles having a short bottom part are kept inactive following a low course, said first selection unit being arranged, in a direction of a forward stroke (A) of said cylinder, in front of said feed station in order to select said needles having a long bottom part which during said forward stroke (A) of said cylinder must be inactive and must follow a course of temporary exclusion from activity, while said needles having a long bottom part that are not selected follow a course of activity and knitting formation, said second selection unit being arranged adjacent to said feed station in order to carry out, during the same forward stroke and after the formation of the knitting, a preselection of said needles, which follow said course of activity and which must be excluded from activity following the course of temporary exclusion during a return stroke (R) of said cylinder, during said forward stroke (A) of said cylinder, said right and left lateral cams act as ascent and descent cams of said needles having a long bottom part, respectively, and define, together with said central cam, a course of momentary inactivity of said needles selected by said first selection unit, while, during said return stroke (R) of said cylinder, said left lateral cam acts as an ascent cam and said right lateral cam acts as a descent cam of the needles having a long bottom part, defining, together with said central cam, the course of momentary inactivity of the needles preselected by said second selection unit.
4 more elements
A circular knitting machine, comprising:
- a grooved motor drive controlled cylinder, which is electronically operated to rotate with continuous rotating motion and with reciprocating motion, and to provide a signal which indicates the angular position of the cylinder;
- needles having a long bottom part mounted on one portion of the cylinder;
- needles having a short bottom part mounted on another portion of the cylinder;
- a plurality of lower needles wherein each of said lower needles are associated with each of said needles having a long bottom part and said needles having a short bottom part through an intermediate pusher;
- a fixed shell having a series of cams provided around said cylinder, said cams for controlling the operating movements of said lower needles, said pushers and said needles having a long bottom part and said needles having a short bottom part, during the rotation of said cylinder;
- a thread-feed and knitting-formation station;
- selection units acting at least on said lower needles for an operating selection of said lower needles, said cams including adjacent bottom parts of said needles, a central cam, a right and left knitting cam, said central cam being arranged above and in an intermediate position between said right and left knitting cams, a right and left lateral cam for ascent and descent on opposite sides of said knitting cams, in a higher position than said knitting cams and lower than said central cam, a right needle ascent cam and a left needle ascent cam, on said opposite sides of said knitting cams, lower than said knitting cams and lower than said lateral cams, at said lower needles, at least one first selection unit of said selection units being provided with one said associated right lower-needle ascent cam and a second selection unit of said selection units being provided with one said associated left lower-needle ascent cam and a pusher ascent cam, said cams in said bottom parts of said needles being positionable to interact with said needles having a long bottom part, which do participate in the knitting with reciprocating motion, while said needles having a short bottom part are kept inactive following a low course, said first selection unit being arranged, in a first direction of rotation (A) of said cylinder, in front of said feed station in order to select said needles having a long bottom part which during said first direction of rotation (A) of said cylinder must be inactive and must follow a course of temporary exclusion from activity, while said needles having a long bottom part that are not selected follow a course of activity and knitting formation, said second selection unit being arranged adjacent to said feed station in order to carry out, during said first direction of rotation and after the formation of the knitting, a preselection of said needles, which follow said course of activity and which must be excluded from activity following the course of temporary exclusion during a second direction of rotation (R) of said cylinder, during said first direction of rotation (A) of said cylinder, said right and left lateral cams act as ascent and descent cams of said needles having a long bottom part, respectively, and define, together with said central cam, a course of momentary inactivity of said needles selected by said first selection unit, while, during said second direction of rotation (R) of said cylinder, said left lateral cam acts as an ascent cam and said right lateral cam acts as a descent cam of the needles having a long bottom part, defining, together with said central cam, the course of momentary inactivity of the needles preselected by said second selection unit.
4 more elements
Dependencies are inferred from the claim text.