JPH03174061A - Combination of double-end needle and slider - Google Patents

Abstract

PURPOSE: To enable the reliable shift of a double-hooked needle from one slider to the other slider by forcing the latch of the double-hooked needle to stay at an open position by a spring and forming a sharp tip point at the tip of a slider. CONSTITUTION: A latch is forced to stay at an open position by a spring placed on a hook of a double-hooked needle to keep it at a stable position 28. At the tip of a slider 8 fitting the double-hooked needle, a sharp tip point 30 is formed. At first, the inside part of the tilting sides of the tip point is allowed to touch the curved end of the double-hooked needle to accurately position the double-hooked needle. The tip point 30 comes into contact with the latch existing at the position 28 and the latch completely opens until the final fitting position, with the upward motion of the outer tilting side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a double-cylinder circular knitting machine equipped with double-ended needles, in which the double-ended needles act on one cylinder to form hand knitting and act on the other cylinder. The needle bed can be used to form a crow stitch, and can be moved between one needle bed and the other needle bed.

In circular knitting machines of this type, therefore, there is a device for transferring the double-ended needles from one cylinder to the other. This crimp machine is capable of producing all types of elastic knitting and all combinations of hand knitting and purl knitting, for example to knit patterns on socks.

As previously mentioned, this type of circular knitting machine utilizes a special type of needle, currently known as a double-ended needle, as schematically illustrated in FIG.

A double-ended needle 3 is provided for a corresponding trick l of each pair of two upper and lower cylinders 2. This double-ended needle 3 acts alternately on the upper cylinder trick and the lower cylinder trick. The double-ended needle 3 is substantially symmetrical and has hooks 4 formed at both its upper and lower ends. These hooks 4 are of identical shape and each separate from a bent end 5 and a pivoted latch 6 at 7. The double-ended needle 3 is driven by a slider 8.

By this slider 8, one of the hooks of the double-ended needle 3 is engaged alternately, and the other hook performs the knitting work.

Each double-ended needle thus corresponds to two sliders 8 and 8'. One slider is arranged on the trick of the lower cylinder, and the other slider is arranged on the corresponding trick of the upper cylinder, so that these sliders alternately engage one end and the other of the same double-ended needle. be.

As shown in FIG. 1, the bent end 5 of the double-ended needle 3 engages in the slider 8 by the action of the lower horizontal projection 9 and the upper inclined spar 10. These lower horizontal protrusions 9 and upper inclined spurs 10 allow the double-ended needle 3 to slide within the trick 1 with the vertical movement imposed by this slider 8.

In the structure shown in FIG. 1, the upper hook 4 remains ready for the task of grasping the knitting yarn from the source and cooperating with the sinker 11 to form the stitch.

This double-ended needle and slider combination functions essentially like the needles of a conventional circular knitting machine. That is, the slider is provided with butts, which are controlled by cams and countercams, as in a conventional circular knitting machine. In the construction shown in FIG. 1, the slider 8' remains essentially inactive in its trick 1', waiting for the arrival of the double-ended needle 3, and then takes over from the lower slider 8 to perform the work. None, during this time the lower slider 8 is inactive.

This handover separates the two cylinders 8 and 8' by a distance that is substantially equal to the distance between the holes of the two corresponding hooks 5 of the double-ended needle 3, when the two spars 10 and 1O' of these cylinders are separated. Then, the end of the transfer slider is moved outward so that it disengages from the hook 4 and retreats, thereby transferring one double-ended needle 3 to the other slider.

Apparatus and methods for performing this transfer are already known in the art. This is discussed, for example, in the 1982 edition of the handbook ``Manuale dei Technorosia bel Lindastria della Maglia'' or 1
Please refer to the 981 edition of the handbook "Manuale dei Technorosia Tessile".

A conventional method and apparatus for moving a double-ended needle 3 is shown in FIG. As is clear in this figure, slider 8
A butt 12 is provided at the bottom of the cam and is driven vertically back and forth by a spring 13 which holds a cam (not shown) and a counter cam and slider in the trick.

The movement is from the lower slider 8 to the upper slider 8'. This upper slider has now already been moved into the lower receiving position by means of a control cam acting on it. The lower cam acting on one of the butts 12 then lifts the slider 8 and moves the double-ended needle 3 to the position shown by the dotted line. The upper bent end now engages the spar lO'.

In this movement in the direction of arrow F, slider 8 urges double-ended needle 3 upwards due to projection 9. The upper bent end 5 meets the spar 10' and moves the slider 8' outwardly past it. As soon as this upper curved end 5 passes over the spar 10', the spring 13 is applied to the slider 8'.
is returned to its original position, so that the upper bent end 5 comes into engagement with the spar 10' and the horizontal projection 9'.

As shown in FIG. 2, the tips 14 of sliders 8 and 8'
The tip is shaped to protrude outward. When the slider 8 lifts up and passes the double-ended needle 3 to the opposing slider 8',
This tip 14, on its upward path, meets a cam 15, known as the spectacle cam. This cam 15
is provided with a hole 16 that opens outwards first, and this hole catches the rising tip 14 and moves it outwards to remove the spar 10 from the hook 4 and hold the double-ended needle 3 further. so that this double-ended needle rises and works on the upper needle bed.

After transferring the double-ended needle 3 to the upper needle bed, the slider 8 is moved downwards and returns into its trick 1 under the action of the spring 13.

The reverse movement from the upper needle bed to the lower needle bed is carried out exactly in the opposite manner as described above, with the reference numerals of the parts shown being reversed.

The spectacle cam also includes other holes 16, not shown. The apertures of this spectacle cam are in all cases open outwardly, albeit at different slopes, so as to cause the slider to move outwardly when it is lowered to pass the double-ended needle.

The method described above with reference to FIG. 2 has some drawbacks, the main of which are discussed below.

First, the spectacle cam 15 is very delicate. That is, it is thin-walled, hard, and therefore fragile. Therefore, they deteriorate rapidly and often break.

Furthermore, when the slider 8 engages the hook of the double-ended needle 3, its latch 6 must open correctly. If you don't open it correctly, this latch will break. In the conventional method described above, correct positioning of this latch 6 is ensured only when leaving the stitch formed along the axis of the double-ended needle 3, and when the knitting yarn breaks or for other reasons. It is not performed when there is no such thing.

Fortunately, even if the absence of knitting yarn does not cause the latch to fail during the movement of the double-ended needle, the latch must be properly positioned so that the work can be resumed.

However, this is done manually, consuming considerable time.

Recently, other methods have been proposed which make it possible to overcome the above-mentioned drawbacks. This proposal will be described with reference to FIG.

Compared to the above-mentioned method, in this proposal, after the double-ended needle 3 is raised, the outward movement of the slider 8, which transfers the double-ended needle to the opposite slider, is moved away from the tip of the slider in a manner similar to moving the spectacle cam 5. This is caused by a radially moving cam positioned at

The shapes of the tip of the slider and the hook 4 of the double-ended needle have both been changed.

As shown enlarged in FIG. 3, the hook of the double-ended needle has been modified to extend the latch 6 well beyond the curved end 5. The tips 16 of the sliders 8 and 8' are inclined in a direction opposite to the direction of orientation of the tips 14 in the previously described manner.

These changes cause the latch to open in the correct position as soon as the tip 16 of the slider contacts the hook 4 of the double-ended needle 3, thereby preventing breakage.

Referring to the sequence of operation shown in FIG. 3, in position A the slider 8 is raised to its highest level by the lifting cam, while the slider 8' is lowered by the lowering cam 18. The slider 8' moves outward as it is lowered. This is spar lO'
This is because the curved end portion 5 is biased outward.

In position fiB, cam 18 moves its slider 8' to its lowest position. The radial cam 19 re-enters the slider 8' into the trick and engages the bent end 5 of the double-ended needle. The double-ended needle 3 now engages both slider 8 and slider 8'.

In position C, the radial cam 2o urges the legs of the slider 8 inwardly to rotate about the bearing center C, resulting in outward movement of the tip 16 and the spar 10'. The bent end portion 5 is removed.

In this position, the double-ended needle is in contact with the slider 8' and is moved upwardly by the cam 21, while the now free slider 8 is in contact with the cam 22 and is moved downwardly by this cam.

Although this modification frees the double-ended needle-slider combination from the typical problems of the previously described methods, it still has drawbacks.

That is, if the double-ended needle 3 is not fully bowed into the trick, for example if dirt, lint, or a piece of knitting yarn gets inside the trick, the tip 16 of the slider 8 will fall into the double-ended needle 3.
When moving in the direction of , it does not meet the latch 6 that should be opened, but instead meets the bent end of the double-ended needle, which gets stuck between the double-ended needle 3 and trick 1, forcing the double-ended needle out of the trick. This ejection of the double-ended needles inevitably causes damage to the double-ended needles, which causes the circular knitting machine to stop, and requires a great deal of effort to repair. This is not impossible. This is because the radial dimension of the hook of a double-ended needle is 1~
2 ml1+, and therefore a slight radial movement of the hook 4 of this double-ended needle is sufficient for the slider 8, which encounters this difficulty when it moves to engage the double-ended needle.

There is a need to overcome the above-mentioned danger by placing a series of sensors at the double-ended needles to indicate when these double-ended needles begin to move even slightly radially from their correct position. Since such a series of sensors has to be set at very small distances, this inevitably results in alarms being triggered or the machine being shut down, often when this is not necessary.

The present invention provides an improved double-ended needle-slider combination that overcomes the drawbacks of the prior art by allowing the double-ended needle to be transferred from one slider to another with absolute reliability. be.

The improvements of the present invention, which consist of changes in both the double-ended needle and the slider, non-limiting exemplary embodiments of which are described in detail below with respect to FIGS. 4-6.

As shown in FIG. 4, the double-ended needle has been modified to include elastic devices on both hooks. This elastic device is
It remains in its open position when it is not exposed to other forces, for example when there is no knitting yarn on the hook. Hooks of this type have been known for some time in the art, for example on manual knitting machines. This is also described in US Pat. No. 4,827,739 for flat knitting machines.

The latch 6 of the hook 4 has a spring 23 inserted into a cavity 24. This spring 23 extends beyond the possible end positions of the latch 6. This spring 23 is supported at both ends and is maintained in position by a slot in the cavity 24. This space 24 is sub-formed in the shaft 25 of the double-ended needle and contains the main text of the Sochi 6 journal.

The end of the latch 6 adjacent to the pivot 7 rests on the bar spring 23 and includes two regions 26 and 27 that are flat or have a slight curvature. These regions are separated by end regions of greater curvature. .

The rear part of the pivot part of the latch 0 therefore consists of a mixed line, at least one point of which is permanently in contact with the spring 23.

The two flat areas 26 and 27 allow the latch 6 to pivot between the end positions shown in thin dashed lines and to occupy two stable positions 28 and 28' shown in thick lines, from which the latch 6 can It can move only by large elastic deformation of the spring 23.

In FIG. 4, the latch 6 is shown in solid lines in one of the two stable positions mentioned above. That is, in this position region 26 engages spring 23.

In this stable position there is a fairly large space 29 between the tip of the latch 6 and the bent end 5.

Bow shown in mm 11. The two joint parts of 1,000 G, namely the fully closed and fully open positions, can only be reached by loading the spring 23, causing the stitch loop (trap) to disengage from the axis of the double-ended needle 3. This occurs when the formed stitch loop passes from the bent end 5 to the axis of the double-ended needle, and also when the slider engages the bent end with its spar. When there is no force maintaining the latch 6 in the other position and loading the spring 23, the latch 6 will occupy the position 28 or 28'.

According to the invention, the slider 8 engaging the double-ended needle of FIG.
The tip of is also changed as shown in FIG.

That is, the slider 8 shown in FIG. 3 has its tip changed. The tip is shaped to form a sharp tip point 30, the two beveled sides of which have a dual function.

During the movement of the slider into engagement with the double-ended needle, it first strikes with its inner part against the bent end of the double-ended needle. This inner slope, which biases the double-ended needle inward, prevents lint or other debris from accumulating within the trick 1, thus correctly positioning the double-ended needle. The outer side also has an opposite slope so that as this section moves upward the upper tip point meets the latch at position 28 and opens it fully to the final engaged position shown in FIG. be.

The order of operations is substantially the same as described above with respect to FIG.

The advantages of the improved double-ended needle and slider combination of the present invention are considerable.

That is, in addition to eliminating the need for a delicate spectral cam, according to the invention, both the double-ended needle 3 and the latch 6 are in the correct position with the slider 8 in contact with the double-ended needle 3, and the opposite slider 8' The control can be changed and vice versa.

The control and verification system for the radial position of the double-ended needles is also simplified and streamlined, which allows downtime and maintenance of the circular knitting machine to be reduced to only when really necessary.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of the main parts of a conventional double-cylinder circular knitting machine with double-ended needles, Figure 2 is a similar vertical cross-sectional view illustrating the operation of the double-ended needles, and Figure 3 is an illustration of the order of operation. figure,
FIG. 4 is a side view showing a double-ended needle improved according to the present invention, and FIGS. 5 and 6 are views showing a portion of a correspondingly improved slider. 1.Trick, 2.Cylinder, 3.Double-ended needle, 4.
・Hook, 5..Bent end, 6..Latch, 8..Slider, 9..Protrusion, 10..Spa, 11..Sinker.
12. Bat, 13. Spring, 14. Tip, 15.
・Cam, 16・・Tip, 17・・Lifting cam, 18・
・Lower cam, 19.20...Radial cam, 21.22
...Cam, 23.. Bar spring, 24.. Blank space, 26.27
...Area, 28.28'...Stable position, 29...Space, 30...Top point.

Claims (1)

[Claims] 1. A double-ended needle and an associated slider for moving the double-ended needle so as to be able to work alternately from one needle bed to the other of a double-cylinder circular knitting machine. In combination, the hooks of said double-ended needles are provided with an elastic device which brings the latches (6) of these double-ended needles into at least one stable position (28) not exposed to other forces.
A combination of a double-ended needle and a slider, characterized in that the tip (30) of said slider is in the form of a sharp point with two sloping sides. 2. A combination according to claim 1, in which the rear part of the end of the latch (6) adjacent to the pivot point (7) is provided with a rod spring (23).
characterized in that it has two parts (26, 27) that are flat or have a slight curvature, in permanent contact with the curvature, and that these two parts are separated by said end of greater curvature. A combination of a double-ended needle and a slider. 3. A combination according to claim 1 or 2, in which a moving slider which takes control of the double-ended needle from an opposing slider first attaches the bent end ( a double-ended needle, characterized in that it meets the latch (6) to ensure that it is correctly positioned in its cylinder trick, and that it then meets the latch (6) thereby ensuring that this latch is fully opened. A combination of and a slider. 4. A combination according to any one of claims 1 to 3, in which the radial withdrawal and approximation movement of the slider in the movement of the double-ended needle from one bed to the other comprises:
A double-ended needle and slider combination, characterized in that it is controlled by a cam acting on the shank of said slider or on its butt.