Patent GB-424021-A (GB)
Title: Improvements in or relating to circular rib knitting machines of the cylinder and dial type
IPC: D04B9/06
Filed: 1933-10-17
Abstract: 424,021. Knitting-machines. SPIERS, Ltd., W., SPIERS, E., XL Works, Walnut Street, and HURD, J. C. H., Laneham, Kirkland Road, both in Leicester. Oct. 17, 1933, No. 28727. [Class 74 (ii)] A central control device for a dial circular knitting-machine comprises a drum 3 mounted on a hub 7 forming part of the cross member 6 for supporting the dial cams &c. The invention is described as applied to a six-feeder machine with rotary needle-beds. The drum 3 is moved intermittently by means under pattern control so that cam bits removably mounted in grooves 4 may act upon mechanism connected with needle operating cams and other parts to be controlled. Some of the connections, e.g. groups of levers 31 ... 33, for operating dial cams are mounted on pivots 30 fixed to the dial cam cap 5<a>. These levers carry nose-pieces bearing on the drum cams and are connected by links &c. to the various dial cams. For other cams or parts to be controlled, levers such as 51 ... 53 are arranged singly or grouped on common pivots depending from the cross arm 6. To change from, say, 1/1 to 2/2 rib and back there is provided, in the mechanism for driving the dial from the cylinder, a racking device controlled by the drum 3 and acting through connections 103 ... 105 on a vertical plunger 102 carrying a cam 101. This cam, when suitably positioned, acts on one or other of rollers 99, 100 carried by a cam bar 94, which thus is made to slide across the face of a disc 90 fast on the driving-shaft 86. The cam bar carries cams 96, 97 against which bear screws 93 in spaced lugs 92 carried by a pinion 91. When the bar 94 is displaced from one terminal position to the other, the pinion 91 is moved a corresponding amount relative to the disc 90. The pinion 91 is in mesh with a dial driving gear 98 and thus steps the dial component on or back sufficient to effect the desired change of rib. The patterning unit described in Specification 282,904, [Class 74 (ii)], is adapted for use in welting &c., in addition to performing its ordinary functions, as follows :-The pivoted jacks 62 are provided with end butts 65, 65<a> of different lengths, operated by cams 66, 67. The cam 66 is attached to a block 68 pivoted on a pin 69. The block 68 is normally pressed inwards by the butts 65, 65<a>, which are acted on by a selector drum (not shown). The block is moved outwards by a lever 70 pivoted on the pin 69 and furnished with a spring plunger 71, capable of being pressed down by a lever 74. The other end of the lever 70 engages with elements in the selector drum the action of which is modified by the drum 3, which acts through connections such as 51 on the lever 74. The cam 67 is attached to a slidable stem 78<a> and urged towards the butts 65, 65<a> by a spring 80. A transverse pin 82 in the stem 78 rests on a stepped forked block 81 the position of which is controlled by the drum 3. When the cam 67 is moved partly in, prearranged jacks are left in a position operative for action on corresponding cylinder needles, in making castoff separating and locking courses. The French welt is made by alternately operating and not operating the cam 67 or by rendering alternate cams 67 inoperative and operating the remainder in conjunction with appropriate control of the dial needles.