Patent GB-797817-A (GB)
Title: Improvements relating to warp knitting machinery
Inventor: PORTER ALAN WILLIAM HENRY
IPC: D04B27/08
Filed: 1955-08-24
Abstract: 797,817. Knitting-machines. F.N.F. MACHINERY MANUFACTURING CO., Ltd. Aug. 1, 1956, No. 24372/55. Drawings to Specification. Class 74 (2). The warp guides of a warp machine are given two complete movements transverse to the row of needles for each complete knitting cycle performed by the needles, each transverse movement of the guides comprising a movement from the rear to the front of the needles and a movement back to the rear. During the first transverse movement and whilst the guides are at the front of the needles they are shogged one needle so as to cause the yarn or yarns of the guide or guides associated with each needle to lap the corresponding needle which during this movement is in a partially raised position and moving towards its fully raised position so that the yarn or yarns is or are fed into the hook of the needle. The second transverse movement occurs during the period when the needles are approaching and returning from their knockover positions during which they have drawn loops over the knockover edges of the sinkers. The guides are then given a shogging motion commencing as they reach their most advanced position in front of the needles and continuing as they are moved back towards the rear of the needles. This latter combined transverse and shogging movement ensures that the yarns pass over the ribs of the sinkers as they commence to move between the needles at the moment the guides commence their shogging movement in front of the needles and thereby avoids the webs splitting or dividing the yarns incorrectly. The inward movement of the sinkers between the needles ensures that the fabric is held down by the webs as the needles are raised prior to the guides receiving a further transverse movement during which the yarn or yarns is or are lapped around the needles. Where pillar warp stitches are produced, in the production of openwork fabric, by each guide or group of guides continuously lapping the same needle, the warp guides are still given two transverse movements and also receive two shogging movements in addition to the lapping movement. For this purpose after a needle has received its yarn or yarns due to lapping by the yarn guide or guides, the guide or guides is or are given a shogging movement along the row of needles for a number of needle spaces commencing at a time when the guide or guides is or are at the back of the needles and this movement continues until the sinkers are completely withdrawn to the front of the needles. Consequently the yarn or yarns passes or pass beneath the sinker webs. The guide or guides is or are then shogged back again, so that the yarn or yarns again engage and the webs of the sinkers as the latter are advanced between the needles thereby forming a loop extending around the sinker nibs. Following the lapping movement of the guides to further feed the yarns to the needles, the guides are again shogged away from their needles but in the opposite direction and during this movement the withdrawal of the sinkers releases the loops formed around their nibs by the previous shogging motions, the lengths of yarns caused by the loops being taken up by the tension bar of the machine. These shogging movements again ensure that the sinker nibs engage beneath the yarns without splitting or dividing them incorrectly. Specification 797,215 is referred to.