US2423630A

US2423630A - Yarn-tension or take-up device, primarily for knitting machines

Info

Publication number: US2423630A
Application number: US661232A
Authority: US
Inventors: Wainwright Carlyle Herbert
Original assignee: Bentley Engineering Co Ltd
Current assignee: Bentley Engineering Co Ltd
Priority date: 1945-05-01
Filing date: 1946-04-11
Publication date: 1947-07-08
Anticipated expiration: 1964-07-08
Also published as: DE813874C; FR926025A

Description

y 1947. c. H. WAINWRIGHT YARN-TENSION QR TAKE-UP DEVICE, PRIMARILY' FOR KNITTING MACHINES Filed April 11, 1946 I I1 uenlor torney Patented July 8, 1 947 S PATENT OFFICE YARN-TENSION OR TAKE-UP DEVICE, PRI- MARILY FOR KNITTING MACHINES Carlyle Herbert Wainwright, Leicester, England, assignor to The Bentley Engineering Company Limited, Leicester, England Application April 11, 1946, Serial No. 661,232 In Great Britain May 1, 1945 Claims. (Cl. 66-146) This invention concerns a yarn-tension or take-up device for knitting machines and other textile machines, and primarily for seamless hose and half hose machines, which device is of the type comprising a biassed yarn-engaging arm or dropper which moves under the action of its bias when the yarn tension decreases to take up slack in the yarn.

According to this invention, a yarn-tension or take-up device of the type specified has, in combination with the arm or dropper, a trapper for gripping the yarn on the supply side of said arm which trapper comprises two relatively separable members one of which is arranged to be engaged and moved by the arm as the latter moves against its bias. Preferably the other trapper member is constituted by a support on which the arm is mounted.

The foregoing and other features of the invention set out in the appended claims are incor- Dorated in the construction which will now be described, as an example particularly suitable for a seamless hose or half hose knitting machine, with reference to the accompany ng drawings in which Figure 1 is a side elevation of the device;

Figure 2 is a plan thereof;

Figure 3 isa part view looking in the direction of the arrows A, A, in Fig. 2;

Figure 4 shows various components of the device.

The device comprises a support column l carrying a platform or bracket 2 having an ear 2a to which a spindle 4 is attached, the arm 5 being pivotally mounted on the spindle for movement between the positions shown in full and dotted lines in Fig. 1. Beneath the platform 2 there is a movable trapper member 6 having a ridge 6a which is pressed up against the underside of the platform by a spring 1 in a manner hereinafter described, and the yarn runs through an eye 8 in the member 6, between the ridge 6a and the platform 2 to a yarn-guide Ed at the free end of the arm 5 and thence to the needles. The arm 5 is blessed to the upper position by a spring 9, and when pulled down by the yarn tension, against the action of this spring, it engages a lip 67) of the trapper member 6 and holds the trapper open so that the yarn may run freely to the needles under such tension as is applied by the pull of the yarn. When the yarn slacks olf, as for example at the commencement of a swing of the knittin machine in knitting a heel or toe, the arm 5 rises and'the trapper closes on the yarn to grip it at a location between the yarn supply and the guide 5a so that further upward movement of the arm takes up the slack between the trapper and the needles.

The manner in which the arm 5 and spring 9 are mounted is best disclosed in Fig. 4. The spindle 4 is attached to the ear 2a by a nut Ill which draws it up against a distance collar H, and the arm 5 is made of wire and has its end coiled at 512 to form a journal encircling the spindle. The spring 9 'which also encircles the spindle is a rat-trap spring (i. e. a coiled torsion spring) having an end 911 hooking onto the arm 5 to raise it and having its other end 919 anchored. It will be understood that by winding-up this spring 9 the bias of the arm 5 may be adjusted, and for this purpose said end 9b is anchored in a knurled thimble l2 which is rotationally adjustable on the end 411 of spindle 4 and may be clamped against a shoulder thereon by knurled nut [3.

In order to facilitate threading up, the movable trapper member 6 is displaceable laterally to the inoperative position shown in dotted lines in Fig. 2, and an adjustment is provided for the grip of the trapper.

The member 6 is freely transfixed by the support column I and at its end remote from the lip 6b it has a spike 60 which engages in a cleft 212 at the rear end of platform 2 to serve both as a pivot and as a locating device. The spring 1 urges the member 5 upwards about said pivot through the medium of a collar M which loosely encircles the column I, and when it is desired to move said member 6 laterally it is pushed down against the action of spring I to separate parts to and 2b. The grip of the trapper is adjustable by means of an adjuster in the form of a split sleeve I 5 which grips the column l frictionally and is slidable therealong to compress or relax spring 1.

We claim:

1. A yarn-tension or take-up device of the type comprising a biassed yarn-engaging arm or dropper movable under the action of its bias, as the yarn tension decreases, to take up slack in the yarn, having in combination a support column, an arm-mountin platform thereon, a movable trapper member for co-operating with the platform to grip the yarn between them at the supply side of the arm, an adjuster movable along the column, a spring interposed between the adjuster and the trapper member for urging the latter against the platform, and means on the movable trapper member for engagement by the arm as the latter moves against its bias and for moving said member away from the platform to release the yarn.

2. A device according to claim 1, having a hole in the movable trapper member through which hole the column extends freely, and releasably interengaged parts on the trapper member and platform, which trapper member is movable around the column on disengagement of said parts.

3. In a device according to claim 1, an adjuster constituted by a slider frictionally engaging the column.

4. A yarn-tensioned or take-up device, com prising a support, a yarn-engaging dropper thereon movable, under spring bias, to take. up slack in the yarn when yarn tension fall's, a. pivotal mounting for the dropper on the support, a rattrap spring at the mounting for biassing the 5. A yarn-tension or take-up device of the type comprising a biased yarn-engagin arm or dropper which moves under the action of its bias, when the yarn tension decreases, to take up slack in the yarn, havin in combination with the arm or dropper, a trapper for gripping the yarn on the supply side of said arm which trapper comprises tWo relatively separable members one of which is arranged to be engaged and moved by the arm as the latter moves against its bias, and a pivotal mounting for swinging movement of the movable trapper member in a direction laterally of its movement by the arm.

CARLYLE. HERBERT WAINWRIGHT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,424,025 Lawson July 25-, 1922 2,091,407 Lawson Aug. 31,. 1937 2,193,311 Cloutier Mar, 12, 1940 2,209,839 Long July 30, 1940 2,270,859 'Abrams Jan, 2'7, 1942