Patent GB-193946-A (GB)
Title: Improvements in rotary or straight bar knitting machines
IPC: D04B11/22
Filed: 1921-11-29
Abstract: 193,946. Cotton, Ltd., W., and Aldridge, C. H. Nov. 29, 1921. Straight-bar machines.-In the production of fancy ribbed work, such as fancy tops, cuffs, gloves &c. with tucked, laced striped &c. courses, the mechanism for actuating tucking point bars and lacing point bars is arranged so that the tucking points F<5> engage certain frame needles A during the pressing operating and prevent the beards of the needles so engaged from being pressed, while the lacing points E' come into action only when the narrowing cam shaft is shogged. The points F<5> are carried on bars F<4> in frames F<3> which are jointed by pins F<2> to arms F<1> mounted on a shaft F on the narrowing machine and operated from a cam or cams by link work F", F<12>, F<10>, F<11> and F<8>. When the narrowing machine descends the lacing points E<7> engage with their respective frame needles while the tucking points F<5> though descending with the points E' remain clear of the needles. The tucking bars F<4> or parts attached thereto are connected to the lacing finger rod E<4> by a bar F<14> sliding in a grooved collar E<8> so that the endways movement of the lacing points are transmitted to them, but as the two sets of points cannot be in action together the endways movement of the points that are out of action is inoperative. The movements are so controlled that when the tucking points are in action they are such as are required for tucking and similarly with the movements required for lacing. The endways movement of the rod E4 may be produced by a pattern wheel or the like or bv the action of a sliding rod H' the forked end H<4> of which carries a roller H<5> acted upon by a number of differently shaped cam segments H' arranged side by side on a fixed pin H<6>. Each segment is stepped at H<8> and is jointed to a separate connecting rod such as H<9>, the lower end of which is shaped as shown in Fig. 5. Arms G, G<1> moved towards and away from each other by cam action carry pins G", G<15> which pass through the slotted ends of the rods H<9>. A pendent arm or finger J fast to a rocking shaft J<1> and controlled by the s @i s @ a pattern chain through intermediate parts J<5>, J<6> and K<3> engages with and rocks its corresponding rod H<9> the arrangement being such that when a stud operates the arm J the rod H<9> is swung so that the step J<3> engages with the pin G<15> on its downward stroke while when no stud operates on the arm J the pin G<14> on its upward stroke engages the step J<2> as shown and drives the rod H<9> upwards. When there is no stud under the arm K<3>, a dropper S<5> is held by a spring S<9> against a set screw K<8> as shown in full lines in Fig. 3. This allows a three-armed lever M, connected by a link M<1> to an arm M<7> on a rocking shaft M<5> to take up a position, determined by the abutment of a stop against the arm M<2>, in which the arm M<4> engages the back carrier rod as shown. A number of droppers similar to S<5> are pendent from the axle S<3> which is reciprocated vertically by cam action. When a low stud such as K<1> comes under the lever K<3> a. setscrew S<10> is brought over the end of an arm M<3> of the lever M and the reciprocation of the axle S<3> rocks the lever M sufficiently to bring the driving arm M<4> in engagement with the second carrier rod, while a high stud such as K<2> coming under the lever K<3> brings the set-screw S" and the third carrier rod into action. The fourth carrier rod is brought into action by a low stud coming under a lever K<4> and holding a set screw S<12> on a dropper S<6> in the path of the arm M<3>, while the action of a high stud on the lever K<4> causes the set-screw S<13> to hold the lever M so that none of the carrier rods are traversed, a drawback or idle course being thus effected. A lever P on the same shaft R as the lever M is acted on by a set screw S<14>, Fig. 4 of a dropper S<8> when a stud comes under the lever K<6>, and this rocks a shaft <p5>, Fig. 1, carrying an arm P<6> with a pin P<7> and allows the hooked end P<2> of the connecting rod F<13> to pass under a pin P<3> on a track arm P<4> thus bringing the tucking points F<5> into action. Another lever N on the shaft R controls the shogging of trucks from one or other of three positions, or sets of cams, for use in connection with the mechanism described above. When plain, tight or slack courses are to be laid a dropper S' is provided with two set screws differing in length and when a high stud', a low stud or no stud comes under the lever K<5> the lever N causes an arm N<3>, Fig. 8 to place a camoperated thrust rod T<9> against the steps 1, 2 or 3 respectively of a bell crank lever T<3>, T<4> mounted on a shaft T'. The end T<3> abuts against a collar on a shaft T which carries forks embracing the trucks to be shogged. A second bell crank similar to T', T<4> but with the steps reversed as indicated in dotted lines acts as a stop and enables the shaft T to be placed correctly and definitely in the position desired as determined by the stud on the chain or other controlling or selecting device. In a modified form, for use where more than about three definite positions of a controlling shaft are desired, the bell cranks are not stepped but are operated by a pair of stepped plates on a thrust rod. This modification is particularly adapted for use in connection with the tensions which have to be controlled to come into action and synchronize with each change in the selection'of the thread carriers.