US1828240A - Lock for producing purl work on flat knitting machines - Google Patents

Description

Oct. 20, 1931. E. o. BOR 1,828,240

LOCK FOR PRODUCING FURL WORK ON FLAT KNITTING MACHINES Filed April 26, 1928 2 Sheets-Sheet 1 Oct. 20, 1931. E. o. BORN 1,828,240

LOCK FOR PRODUCING PURL WORK ON FLAT KNITTING MACHINES Filed April 26. 1928 2 Sheets-Sheet 2 Q Irwenlar Patented Oct. 20, I

UNITED STATES ERNST OTTO BORN, OF BABENSTEIN, NEAR CHEMNIT Z, GERMANY LOOK FOR PRODUCING FURL WORK ON FLAT KNITTING MACHINES Application filed April 26, 1928, Serial No This invention relates to flat knitting -ma-' chines for purl knitting in which double ended hooks are used. In former machines of this type a row is knit by moving themachine through a complete reciprocation.

The object of the present invention is to increase the output: of purling machines by a construction which will produce a. knit row by a single movement of the carriage in one direction. This is accomplished by providing two locks in alignment on either side, so that the first pair of. locks distributes the needle and knits, While the second pair collects the needles and knits. In all known constructions in which two locks are provided in alignment, the second lock does not produce a complete knitted row butis used instead to produce a petinet pattern.

Further objects and advantages of the. in-

vention will become apparent from the following description when taken in conjunction with the accompanying drawings which form a part thereof.

In the drawings:

Fig. 1 is a top plan view of the cams and needles, the jacks being represented diagrammatically.

- Fig. 2 is a cross-section on the line A-B, Fig. 1.

Fig. 3 is a top plan view of a modified form of the cams.

In the form shown in Fig. 1, the front and rear cams are the lower and upper cams in Fig. 1 respectively.

The knitting mechanism, comprises the two needle beds a and b, in which grooves the double ended needles 0 are movable. These needles are moved in the usual manner by jacks d, e operated by looks or cam beds.

The butts f, i of the jacks engage in the cam grooves g, k of the locks or cam beds 72 m of the beds a, Z) respectively. The jacks on one side move the needles forward and at the end of the forward movement release the needles 5 so that the jacks of the other bed may grasp These needles are selected by a jacquard de- 27s,o72, and in Germany April '29, 1927.

vice comprising a series of cards mounted on a cylinder, the cards moving towards and from the acks by means of a thrust member which swings the cylinder at proper intervals. The sinkers e of the jacquard device push the selected jacks of the rear bed forward towards the front bed. Such a device is shown in Austrian Patent No. 1345 at A, Fig. 2. The butts of those jacks which are pushed forward move in the cam grooves, while the butts of the remaining jacks remain outside the channel and the corresponding needles do not lmit.

At the ends of the cam bed are provided switch camsor ton es 'n, 0. As shown in Fig. 1, the jacquar will push some of the butts forward to a point where they will pass below the tongues and into the cam groove. The tongue at the opposite end is in lowered position and serves to collect the butts again into alignment. When the carriage moves in the opposite direction, the tongue 47. is lowered and the selected butts pass beneath tongue 0 and are collected by tongue n. These tongues may be raised and lowered by lugs properly spaced on the carriage, or light springs may be provided which will normally hold the tongues in lowered position (as 0,

Fig. 1), but which will permit the'butts to iaiselghe tongues to pass therebeneath (as n,

The particular novelty in the present case resides in the form and arrangement of the high points p, g, 1' and s of the cam grooves, which make it possible to knit a complete purl row upon each movement of the machine in one direction.

The cam beds each consist of two locks placed side by side and having cam grooves in which the butts engage. The high point 71 of the front bed is displaced to the left of high point 1' of the rear bed, while high point 9 is to the right of high point 8. This is clearly shown by the broken lines in Fig. 1. The positioning of these high points makes it possible to knit a complete purl row in each movement of the machine in one direction.

Since the high point p is displaced to the Y left than the guide edge u of the hi h point r. The edges t and u operate to ift the jacks so that they will disengage the needles. Since the guide edge u terminates before the guide ed t as the cam is moved in the direction of t e arrow in Fig. 1, the acks which have been pushed ahead by the jacquard and whose butts are in the cam groove is. of the rear needle bed, drop on the needles and enge them and draw them into the rear needle zd, while the jacks in the front needle bed are still disengaged. The needles corresponding to the jacks which have not been selected by the jacquard device will not be engaged by any jacks in the rear needle bed and will, therefore, be held by the jacks of the front needle bed and will be drawn back into that bed.

In a similar fashion the guide edge of the high point q does not extend to the left as far as the guide edge of the high point 8 and the needles are, therefore, drawn back by the jacks into the front needle bed.

The operation of the device is as follows:

The jacks e of the rear needle bed b are pushed by a jacquard device to a point where their butts 'i engage in the cam slot is on the rear cam bed m, Fig. 1. If the carriage now moves in the direction of the arrow the jacks e will be moved forward until they reach the needles 0, Fig. 2. The high point 1' of the rear cam and the corresponding high point p of the front cam h are staggered slightly, so that the jacks e are withdrawn by the rear cam m before they are withdrawn by the front cam h, and 1n this way the needles 0 are moved with jacks e on the rear needle bed. In this second set, the high points 9, s of the front and rear cams are again staggered, but this time in the opposite direction. In this way, the needles 0 which have been drawn backward by the rear jacks e are now moved forward, engaged by the front jacks d and, as the front jacksd are now withdrawn first, these needles 0 are moved forward to the front needle bed a.

When the cams are now moved in the opposite direction, the jacks (n) on the rear needle bed (6) will be moved back, first by the cams of the left hand set, Fig. 1, and in the next art of the operation the jacks (d) of the ront needle bed (a) will be withdrawn first. It is thus clear that each complete reciprocation of thecams produces two knitting operations from each bed and doubles the output of the machine.

Of course, the jacquard device may select only certain needles to be moved into the cam groove. and thus permit rib knitting.

In the modification shown in Fig. 3, two high points (1, d are provided on the rear cam (m) overlsippingeach one on the front. That is, each of the 'igh points ((1 d) on the rear cam (m) is less in width than the corresponding high point (as,'y) of the front cam (h) but the two together extend on each side of the high point (x, y) If one or the other of the rear high points is removed, then the front high point will extend farther in one direction than the remaining rear high point. If only the inner points (1 or the outer points d are in use, the action will be the same as that described above. If, however, both of the high points (d d") are used -in each set, the machine will do straight knitting. If both the high points are used in one set only, the needles willbe divided and collected only in the other set and the machine will alternate straight knitting and purling or ribbing.

I claim 1. In a purl knitting machine, a carriage, a pair of opposed flat needle beds, a plurality of double ended needles in said beds, means for moving some of said needles from one bed into the second bed and for causing said needles to knit in the second bed, and means for moving the needles completely back again into the first bed and for causing the needles to knit in the first bed during a movement of the carriage in either direction whereby the needles knit a complete purl row during movement of the carriage in one direction.

2. In a purling machlne, a pair of opposed flat needle beds, a plurality of double ended needles, reciprocal means for dividing and collecting said needles twice in one complete reciprocation, means for moving some of said needles from one bed into the second bed and v for causing said needles to knit in the second bed, and means for moving said needles completely back into the first bed and for causing the needles ,to knit in the first bed during a movement in one direction, whereby the needles knit a complete purl row during a moveinent in 1one direction.

3. n a pur ing machine, a air of o posed flat needle beds, a cam bed cdirespon ing to each of said needle beds, each cam bed having-two sets of knitting cams thereon, a plurality of double ended needles mounted in said beds, and means for causing said needles to pass through a set of cams in one bed to knit in said bed and to pass through a set of cams in the second bed to knit in said second bed during a single stroke.

4. In a purl knitting machine, a air of flat opposed needle beds, a plurality 0 double ended needles in said beds, means for moving some of the needles from one bed into the second bed and for causing the needles to knit in the second bed, means for moving the needles completely back again into the first bed and for causing the needles to knit in the first bed during a movement inone direction, said means including locks, the central portions of the locks of one of said beds comprising parts whose centers are displaced from the centers of the parts of the opposite locks of the other bed, the parts of the locks of one of the beds being wider than the parts of the locks of the other bed, a portion of each of said wider parts being removable.

5. In a purl knitting machine, a pair of opposed flat needle beds, a plurality of double ended needles in said beds, a plurality of jacks mounted in said beds, means at each end of one of the beds for forcing some of said jacks forward to engage the needles while permitting other of said jacks to remain disengaged from the needles, means for moving the needles which have been engaged by the jacks from one bed into the second bed and for causing said needles to knit in the second bed, means for moving said needles completely back into the first bed and for causing the needles to knit in the first bed during a movement in one direction and means for collects ing said jacks at the end of a movement of the device in either direction.

In testimony whereof I have aflixed my sig-.

nature.

ERNST OTTO BORN.

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