Patent GB-184309-A (GB)
Title: Improvements in rotary or straight-bar knitting machinery
IPC: D04B11/22
Filed: 1921-06-06
Abstract: 184,309. Cotton, Ltd., W., and Aldridge, C. H. June 6, 1921. Straight - bar machines.-Relates to an attachment by means of which a patternwheel which controls the movements of points, carriers, &c. can be racked backwards and forwards predetermined distances so that in making openwork, embroidery effects, clocks, &c. in which parts of the pattern repeat, the corresponding sections of the pattern-wheel may operate any number of times before passing on. The patternwheel C controls through parts D<4>, D', D<2> the movement of rods B, B<1> carried by the narrowing machine and carrying the point bracked &c. used in the formation of the pattern and is racked forward, when the cam shaft A<1> is shogged to the right, by a clawker C' operating a ratchet C<3> and driven by a lever C<6>, roller C<7> and cam C<8>. The clawker C<4> is arranged so that in its highest position the driving-nose just misses the teeth of the wheel C<3>, the part C<5> being shaped to rest against the teeth in this position. When it is required to rack back the pattern-wheel C, a second ratchetwheel H on the shaft C<1> is operated by a clawker G<4> which is driven in a similar manner to the clawker C<4>. The wheel H is provided with teeth only at the places corresponding to the sections of the pattern wheel C where repeats are required so that as the wheel C moves forward the clawker G<4> moves idly until a tooth arrives within range of the clawker G<4>. Having arrived at this point the wheel C continues to move one tooth backward and forward until the clawker G<4> is placed out of action again by a stud on the pattern chain acting through connections on an extension G<5>. The wheel C is then racked forwards bv the clawker C<4> to the next repeat. While the wheel C is racked back, the part D<4> is held clear of the wheel by connections operated by a cam F<3> on the shaft A<1>. If the wheel C is required to rack backwards and forwards a distance of two teeth, the wheel H is provided at the corresponding positions with pivoted attachments K, Fig. 4, the tails K<7> of which are shaped so as to act on pins G<6> to hold the clawker G<4> out of action while the wheel C racks forwards two teeth. At the end of the second rack when the clawker G<4>, which is arranged to move twice in each plain course, makes its first descent the pin G<6> drops off the tail K<7> and when the clawker rises the pin G<6> comes underneath the tail K<7> as shown in Fig. 8. On the second descent the clawker draws the wheel H back through a distance of two teeth on the wheel C<3>. It is also possible to arrange for the wheel C to be racked backwards and forwards through a distance of four or a larger number of teeth. When the requirements of the pattern necessitate a change in the relative positions of the rods B, B<1>, they are provided with collars formed as edge-cams and the change is effected by turning one of the collars so that the edgecams move the rods into a new relative position. To avoid the use of a large number of pattern studs in a continuous row, the stud lever may be locked in raised position by an auxiliary lever so that it continues to operate as if a continuous row of studs were passing under it. The stud lever is placed out of action when required by a stud which releases the locking-lever.