US1780975A - Straight-frame knitting machine - Google Patents

Description

Nov. 11, 1930. F. ISRIAELYSON I 1,780,975

STRAIGHT FRAME KNITTING MACHINE Filed Nov. 14. 1927 3 She ets-Sheet 1 4 b Lb lLo Mo T Jr mum

Nov. 11; 1930..

F. ISRAELSON I 1927 3 Sheets-Sheet 2 Nov. l1, 1930. F. ISRAELSON STRAIGHT FRAME KNITTING MACHINE s Sheets-She et 5 Filed NOV. 14, 1927 Patented Nov. 11, 1930 PATENTF Fries I FRITZ IsRAELsoiv, or s'rocKHoL SWEDEN,

STRAIGHT-FRAME KNITTING MACHINE Application filed November 14, 1927, Sean No. 233,117, and in Sweden January 25, 1927.

butts during the stitch forming operationthere'is provided a needle guiding channel having a point lever pivoted in it and controlled by a'spring tending to maintain said .point *lever in its oneeXtreme position in which it allows the needles to enter a section of said channel leading to the cam slot formed by the respective cam look, while the lever, after-having been moved to its opposite extreme osition will cause the needles to ass outside said 'carn slot, that section of said guiding channel through which the needle butts pass in said last mentioned case be- .ing of such a shape that a needle butt, passing through said section of the channel, will automatically swing the point lever on its pivot so as to allow a further needle butt to enter said channel section.

In the drawings one embodiment of the invention is illustrated. Fig. 1 is a view of the under side of the foremost half portion of the carriage of a straight frame knitting machine. Figs. 2 2 illustrate in a. diagrammatic manner a striped knitting produced by a knitting machine according to the invention. Fig. 3 is a plan view of a mechanism to control the-pattern knitting device according to this invention. Fig. 4 is an end view of said controlling mechanism.

A straight frame knitting machine of the Lamb type comprises, as is well-known, two rows of needles mounted in a frame in the form of an inverted V and operated by a reciprocating carriage; Said carriage is indicated by the reference numeral 1 in Fig. 1 and carries in the usual way a cam lock to The invention has for its obguide the needle butts during the'stitch forming operation, said cam lock comprising the lowering cams 2, 3 and-the liftingcams 4:, 5, 6. The lifting cam 5 is formed integralwith a lever pivoted at 7 to the carriage, said pivot also carrying a point lever 8. Said point lever 8 is situated in a needle guiding channel formed between a non-adjustable ortadjustable block 10 and another block 11. The block 10 is formed wit-h a shoulder to be en-" gaged by the point 9 of'the lever 8, and when said point engages said shoulder, as shown in Fig. 1, a channel 12 will be formed for the needle butts between the upper edge of'the lever 8 and the block'll. Those needle butts, '65 which in the movementof the carriage to the right, that is, in the direction of the arrow a (Fig.1), enter the channel 12 will be passed to the cam lock to be given therein the movement necessary for the stitch forming op eration. If the point lever 8 is swung'from the shoulder of block 10 needle butts are allowed to enter the channel portion 13 between the' lever 8 and the block 10. Needle butts which in the movement of the carriage pass the channel 13 cannot enter the cam lock. The lever 8, as shown, is provided'with a projection 14 on its side facing the block 10. A needle butt passing through the channel portion 13 will engagesaid projection 14, there-- by swinging the lever. 8 to allow a needle butt to enter' the space 13 between the point 9 of the lever 8 and the block 10.

If the distance between the point and the projection 14 corresponds, for instance, to 10185 pitches of needle and if five needle butts are introduced .below'the point lever 8 in the extreme right hand position of the carriage,

the succeeding five needle butts will. pass above said lever,then at the movement of the 1'90 carriage there wil'l',evidently, pass alternately five needle butts through the cam lock-of the carriage and five needle butts below said cam lock. p

In the following a description will be given of the manner in which said mechanism is used for producing patterned and striped knitted Works. In this descriptioniit may be assumed that the cam lock of the rear carriage is so adjusted that stitch forming will yarn, Said needles,"howlever, will 'not' be take place in both directions of movement. The cam lock ofthe front carriage isv ad-' justed so as to form complete stitches in one direction of movement only. In the other direction of movement the :needles will be lifted to such I a level that theymay seize lowered suificiently by the succeeding lowering cam 3 .The yarn'loop whichinthe up- I be pushed ofi from the needle but will come below the depending latch of the needle hook. When the needles of the front bed pass the cam lock said yarn loop in the downward movement of the needle will lift thedepen'ding latch causing the latter toclose the needle hook with the yarn in engagementtherewith.

At the following, stroke both of said loops will be pushed down .onthe needlestem, the

yarn seized by the needle hook being passed through two yarn. loops to ,form thicker stitches.

Upon the movement of the s. carriage to the left all the needleswill be caused toI-enter the'knitti-ng cams by"mea ns not point lever 8; In'the end position of the carriage 'there are alternately introduced two tively. rBlack yarn is represented in the r drawing by a: single curved line or a single dot, red'yarn by'a double curvedline or a :take yarns.

striped knitting by means of the machinethe I yarn in their hooks, and the needles of the a :4

- shown and forming no part ofthe invention.

The needles willbe raised by cams and 6to 1 Fig. 2 (2 2 "illustrates how effect a front carriage of which is provided withone needles into the channels .12 and :13, respeccircle. Fig. 2 may be assumed-to show the appearance of a number of needles after the completion'of a number of operating strokes with black yarn. The needles of the rear bed as well as those of the front bed carry front bed carry yarn loops over their are .shown after the carriage hasv'completed an operating stroke from the right to the left'with red yarn. In said stroke the needles a, b and 'e," 7 have formedcom-v -plete stitches, 03d and g, it have been I lowered to some extent by the lowering I v ing the needle latch. =Ac'cording to Fig. 2

cam to remove the black yarn loop surround all of theneedles of the rear be-d carry red yarn in their hooks, while at the front bed a the needles a, b and e, f carry redyarn and I the needlesc, d and g, h black'yarn fromthe appearance of a number'of needles after the preceding operating stroke. In the next op- Y? erating stroke, that is, from the leftto the right, all needles will be lifted .to seize red 'yarn; The needles of the rear bed are-completely lowered, those of the front bed only the frontbed needles and the rear bedneedles' carry red yarn in their hooks, the front bed needles having, furthermore, a loop over their latches formed on theneedles a, b and e, f by red yarn and on the needles 0,03 and g, h by black yarn; In the next operating .stroke.tha't,is, from-the right to'the left theneedlesl are operated so thata,.b and 6,7 a willpass below and c, d andg,"h above the q point lever 8. In this movement the said last-mentioned needles will form stitches of blackyarn, the guides for said yarn having beenput into operation in said stroke; The red yarn engaged by the needle hooks will be pushed up on the stem oftheneedles but will always be above the black yarn that has held the needle latches'closed. In the stitch'forming operation said last mentioned yarn will v 1 come to lie in front-of the red yarn sojas to cording to Fig. 2 allpof the needles carry yarn in their books. The-needles of the rear to v bed as'well' as the needles 0,. dland g, h of the front bed carry black yarn, 'while' the needles, s a, b and e, f have retained in their hooks the red yarn seized in the preceding operating stroke. After a furtheroperating stroke has been completed all of the needles, as shown fiwill carry red loops and the needles 0, (Z and 2 and 52 which are identical w-ith 2 and-2 In order to facilitatethe production of striped and patterned knitted works it is desiredlto use auxiliary means whereby during each operating stroke the desired number of carriage 1 embraces by its forked end alateral .projection'S of the lever 8 normally'to maintain'thefree end '9 of the lever '8 in engagement with the block 10'. Bea-ring against the lower sideof lever 15 is'a lever 15 journa-led on the carriage .1 at 15. -Pivotally'connected to lever15 at 15? is a lever '15 substantially of the shape of an inverted T. Lever 15 is I journaled'on the carriage at 15 and pivotin Fig; 2?,.will' carry black yarn-in their. hooks-and, in addition, the needles a, b and e,

j g, h'black loops upon their latchesp Figs.

show the continuation of the stitclrforming 7 'operation, From these figures'it will be seen that'the front bed needlesa, I) and e,-f will form red stitches and the needles 0, d and u "g, h bl'ack stitches, as according to theabove 5 description a black yarn of the saidfirst' mentioned needles will" always be covered by V V p 'a' red yarn, and viceversa. latches too. In Fig. 2 the same needles ally connected to the lever 15 'at 15 i is a lever 15 acted upon bya spring 1'5 connected to one arm of the lever 15*. A stop pin 15 on the lever 15 limits the movement of lever 15 relative to lever 15 under the action of the spring 15 which spring however cannot overcome the action of spring 15 of the lever 15.

Near one end of the machine frame a series of preferably spring operated, swingable arms 16 are journaled on a shaft 16 parallel to the direction of movement of the carriage 1. Said arms 16 are obliquely cut at their free ends and so positioned that said free ends in the normal position of the arms 16 may cooperate withthe correspondingly obliquely cut end of the lever 15 during the movement 1 of the carriage. When the carriage is moved to the left the lever 15 engages the straight sides of the arms 16 and is caused due to this engagement to turn on its pivot 15 without lifting the lever 15 The needle distributing lever 8 will thus not be operated, allowing all of the needles to pass thereabove. When, however, the carriage is moved to the right the lever 15 will engage the obliquely cut ends of the arms 16. Due to its engagement with the pin 15" the lever 15 cannot turn but will be lifted by said oblique ends, thereby, in turn lifting the lever 15 which will now lift the lever 8 by means of the connection described. By proper adjustment of the arms 16 any desired distribution of the needles to the channels 12 and 13 may be obtained. It is to be noted, that the machine should have one selecting arm 16 for each separate one of the needles that may be contained between the point 9 and the projection 14: of the lever 8. p

In order to facilitate the knitting operation the machine may be fitted with means to automatically control the adjustment of the various selecting arms 16. To this end the machine may be provided, as shown in Figs. 3 and a, with a rotatable drum 17 having recesses 18 formed in it to be engaged by projections 19 ofthe arms 16. Any arm 16, the projection 19 of which is in engagement with a recess 18, will assume such a'position as t0 operate the lever arm 15 to lift the point lever 8. Those arms 16 not engaging any recesses 18 cannot operate the lever arm 15 and will thus cause the needles to pass above the point lever 8 outside of the cam lock. It will be seen, that it is possible in this way to obtain the needle distribution desired. If the drum 17 is provided with a number of rows of recesses with diflerent position of the recesses in the several rows the needles may be automatically set for producing the pattern desired by rotation of the drum.

What I claim is:

1. In a straight frame knitting machine the combination with the beds and their needles, of carriages reciprocating on said beds, cams on said carriages to form a knitting position for the needles, a set of other cams on said carriages in front of said knitting position, a shiftable lever between the cams of said set to form two alternate passages to guide the needles into the knitting cams or outside thereof, means to normally cause said lever to keep one passage closed, and means to cause each needle introduced in said normally closed passage to automatically shift the lever to cause it to momentarily ope said normally closed passage.

2. In a straight frame knitting machine the combination with the beds and their needles, of carriages reciprocating on said beds, cams on said carriages to form a knitting position for the needles, a set of other cams on said carriages in front of said knitting position, a shiftable lever between the cams of said set and the knitting cams to form two alternate passages to guide the needles into the knitting cams or outside thereof,

means to normally cause said lever to keep one passage closed by resting with its point against the respective cam, and an abutment on the side of the lever facing said cam to needles, of carriages reciprocating on said beds, cams on said carriages to form a knitting position for the needles, other cams on said carriage infront of said knitting position, a shiftable lever between the cams to form alternate needle guiding passages, a

spring actuated lever system normally to cause the shiftable lever to keep one of said passages closed, and means to operate said lever system to open and close said passages in a predetermined order at the beginning of each operating stroke of the carriages, said last mentioned means comprising a setof selecting arms and a drum for actuating said arms whereby the latter are held in position to engage the lever system or out of engagement with the latter.

In testimony whereof I have signed my name.

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