FR2652593A1 - COMBINED KNITTING NEEDLE. - Google Patents

Abstract

A combined needle comprises a needle shank (2), in which a slider groove (8) is formed, and a slider (3) slidably fitted in the groove of the needle shank. A cam surface (12) is formed in a portion (9) of a guide surface defined at the bottom of the groove (8) so as to be in contact with a tongue (14) of the slider.

Description

The present invention relates to a needle

  the combination for knitting machines.

  A known combination needle includes a needle rod and a slider slidably adjusted in the needle rod, the needle rod and the

  slider being actuated separately by cams

  pectives. As shown in FIG. 4, this known combined needle 51 comprises a needle rod 52, a slider 53 slidably adjusted in the needle rod 52, and a plunger 54 driving the slider 53. A groove 55 formed in the needle shaft 52 for

  receiving the slide 53 has a constant depth

  te, and the lower edge of the slide 53 in contact with

  smoothing with the surface of the bottom of the groove 55 is straight. Consequently, the tongue 56 of the slide

  53 advances along a straight path towards the cross

  chet 57 of the needle rod 52 and the slide 53 must therefore slide along a plane at the hook 57,

  in order to close the hook 57 by the tongue 56 of the neck

  ram 53. Consequently, the ram 53 must be held at a height Y (FIG. 5) by the groove 58 of the needle rod 52. When using such combined needles known in a knitting assembly, a thread s extending between a supply device 59 and a knitting plate 61 extends in a straight line and in contact with the grooves 58 of the combined needles 52 fully raised, as shown in side view on

  Figure 5. When the needle rod 52 of the needle

  the handset 51a descends to pick the wire 60 with its hook 57a, the end of the hook 57a risks pricking the wire 60 or else the hook 57 does not succeed in grasping the wire 60, because the wire 60 is raised by the groove 58 of the adjacent downward combined needle 51b, so that a knitting operation cannot be performed

stable.

  During the knitting operation, the higher the

  the throat of the end throat is large, the greater the

  friction resistance of the needle acting on the

  the key retained by the needle is large. Such high frictional resistance can cause the wire to break or cause irregular meshes. One can avoid such a disadvantage by increasing the length of a part of the needle rod between the hook 57 and the groove 58 of width Y, which however requires

  increase the stroke of the needle rod.

  The present invention aims to avoid the inconveniences

  above from the usual combination needle.

  The object of the present invention is therefore to

  provide a combined needle including a needle

  guille having a relatively small throat width,

  that is to say a small dimension of the throat with reference

  in the sense of the depth of the needle groove

  le, which exerts a relatively small friction resistance on the old loop retained by the needle, and a slide which can advance to the hook of the

  needle rod without pricking the thread brought to the hook.

  According to one aspect of the present invention,

  a combined needle includes a needle rod

  carrying a slider groove, and a slider slidably fitted in the groove of the needle rod, said needle being characterized in that a surface

  cam is formed in part of a guide surface

  ge defined at the bottom of the groove so as to be in con-

  tact with the slide tab, and the slide is lifted from the bottom of the groove by the surface

  cam provided at the bottom of the groove, when the sliding

  bucket advances towards the hook of the needle rod, so that the tongue of the slide comes into contact

  with the hook of the needle rod.

  Other objects and advantages of the invention ap-

  will appear to men of art in the light of the

  description of its preferred, non-limiting embodiment, shown in the accompanying drawings, in which: Figure 1 is a side view of a combined needle in a preferred embodiment of the present invention; Figure 2 is a longitudinal section of the head region of the combined needle of Figure 1; Figures 3a, 3b, 3c and 3d are side views of the head region of the combined needle of Figure

  1, illustrating successive stages of the movement of the neck

  scissors; Figure 4 is a side view of a conventional combination needle; Figure 5 is an enlarged side view of the hook of the combined needle of Figure 4; and Figure 6 is a front view facilitating

  the explanation of the movement of a set of needles

  usual binoculars for a knitting operation.

  The preferred mode of realization will now be described.

  sation of the invention. The slide adjusted so

  smoothing in the needle rod is driven for a forward movement by a slide actuating cam

  which attacks the slide button so that the tongue-

  te of the latter approaches the hook of the needle rod

  the. The bottom edge of the slider head region slides along the cam surface formed in the bottom surface of the slider groove, so that the slider tongue gradually lifts up in the groove as the tongue approaches the hook

  the needle shaft. Therefore, the tab approaches

  from the hook of the needle rod by the side of the needle

  end gion and finally closes the hook. Thus, the tongue of the slide comes into contact with the hook without pricking the wire caught by the hook. Since the rod

  needle has a relatively narrow groove, a resistance

  relatively small friction factor acts on the an-

  this loop retained by the needle rod while the needle rod is moving vertically. We now describe a combined needle,

  in a preferred embodiment of the present invention

  tion, with reference to the accompanying drawings.

  A combined needle 1 according to the present invention comprises a needle rod 2, a slide 3 and a needle plunger 4. One end of the needle rod 2 has a hook 5 and the other end is in contact with the needle plunger 4. The rod

  2 and pusher 4 can be formed in a single piece

  this. When used as a transfer needle, have it

  combined guille 1 is provided, on its lateral surface,

  of an elastic transfer piece 6. A cover groove

  ram 8 for receiving the ram 3 is formed in the upper side of the needle rod 2, with a profile conforming to that of the ram 3. The groove 8 comprises a deep part 9, in a region close to the hook, and a part shallow 10 in other regions. The deep part 9 corresponds to the groove 11 of the needle rod 2. A cam surface 12 is formed in the bottom surface of the deep part 9. The cam surface 12 is inclined upwards towards the hook 5 The width X of the groove 11 is smaller than the width

  Y of the usual combined needle throat.

  The slide 3 has a tongue 14 at its front end 13. The lower edge of the front end 13 is curved in an arc to form a sliding edge 15. When the slide 3 is adjusted in

  the groove 8, the sliding edge 15 rests on the surface

  face 9 of the bottom of the groove 8. The slide 3 comprises

a button 16.

  As shown in FIG. 1, the rear end of the tail 17 of the slide 3 is held between the fingers 18 of the pusher 4 so as to slide inside a U-shaped groove defined by the fingers 18. When the combined needle 1 is inserted into a needle groove, the tail 17 of the slide 3 is located in the shallow part 10 of the groove 8 of

  the needle rod 2 and the front end 13 of the coulis-

  bucket is in the deep part 9 of the groove 8 of the rod 2, the sliding edge 15 resting on the cam surface 12 in the deep part 9 of the groove

8 of needle rod 2.

  The slide 3 is driven in cou-

  smoothing in the groove 8 of the needle rod 2 by a

  slide maneuvering cam, not shown, which

  as the slider button 16. In a state illustrated in Figure 3a, in which the slider 3 is completely

  moved back to its extreme rear position in the needle rod

  2, the tongue 14 of the slider 3 is pressed into the deep part 9 of the groove 8. When the slider operating cam, not shown, attacks the button 16 to advance (raise) the slider 3 towards the hook 5, the sliding edge 15 of the front end 13 of the slider 3 slides along the cam surface 12 formed in the deep part 9, so that

  the tongue 14 of the slide 13 rises gradually-

  ment and out of the deep part 9 of the groove 8 when

  that the slide 3 moves towards the hook 5. More precisely, the vertical distance, as shown in FIG. 3a, between the end of the tongue 14 and the front end of the cam surface 12 in the deep part 9, increases gradually as

  that the slide 3 approaches the hook 5, a va-

  their H in the state shown in FIG. 3a, at a value

  their H 'in the state shown in Figure 3b, to a value H "in the state shown in Figure 3c, then

  at a value H "'in the state shown in Figure 3d.

  Since the end of the tongue 14 of the slide 3 is

  close to the hook 5 from the inside thereof, the tongue 14 of the slide 3 moves without poking into the

  thread supplied to the combined needle 1.

  As shown in the description above, the

  tongue of the slide of the combined needle according to the present invention approaches the hook of the rod

  needle inside the hook when the

  wand advances towards the hook, so that the thread

  born on the hook is never taken by the tongue and

  thus avoids broken threads and defective meshes

  his. In addition, since the slide moves from

  this way the width of the throat of the needle rod

  the can be relatively small, so that the groove exerts a relatively small friction resistance on the old loop retained by the needle rod when the needle rod moves vertically. Consequently, the wire is subjected to a less effort, and one avoids the breaks of wire and the irregular meshes

  due to the needle pricking action

biné.

  It is understood that modifications of detail can be made in the form and construction of the arrangement according to the invention, without departing from the scope

of it.

Claims (3)

  1.- Combined needle (1) comprising a needle rod (2), in which a slider groove (8) is formed, and a slider (3) adjusted so as to   smoothing in the groove of the needle rod, characteristic   in that a cam surface (12) is formed in a part (9) of a guide surface defined at the bottom of the slide groove, so as to be in contact with the tongue (14) of the slide, and the slide   is raised relative to the bottom of the groove by the over-   cam face formed at the bottom of the groove when the   ram advances towards the hook (5) of the needle rod, so that the tongue of the ram comes into contact with the needle hook.   2.- Combined needle according to the claim-   tion 1, characterized in that a lower edge of a front end (13) of said slide (3) is curved in   arc of a circle to form a sliding edge (15).   3.- Combined needle according to the claim-   tion 1 or 2, characterized in that it has on its lateral surface, an elastic transfer piece (6)   for use as a transfer needle.