GB1561726A - Method of forming a knitting needle latch pivot - Google Patents

Description

(54) METHOD OF FORMING A KNITTING NEEDLE LATCH PIVOT (71) We THE TORRINGTON COM PANY, a Corporation organised and existing under the laws of the State of Delaware, United States of America, of 59 Field Street, Torrington, State of Connecticut 06790, United States of America, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to knitting machine needles. More particularly, this invention is an improvement in or modification of a method for making a knitting machine needle, as disclosed in U.K. Patent Specification No. 1425988 Current methods of making knitting machine needles having a latch include using a pair of punches to displace a portion of side walls of the blade of the needle adjacent a slot for the latch.

The side walls are punched inwardly after the latch is placed into the latch slot, and a pivot hole of the latch is aligned with the punches so that the displaced portion of the side walls will extend into the latch pivot hole. The displaced portions may be completely displaced or angularly displaced.

Such currently made needles have many advantages over needles with latch pivots of the old screw rivet type. However, in rough service, high speeds and tight loops, the latch tends to spread the cheeks. This sometimes causes fatigue failures. In addition, the needle may be slightly spread open leaving the latch with less support than it should have. In tightly arranged knitting elements such a latch may strike adjacent elements which it should clear. This leads to wear in areas not intended. Also such extra loose latches do not always behave exactly as do proper support latches. For such reasons, it would be desirable to fuse the two displaced portions together. However, to properly fuse the two portions together is very difficult. This is so, among other things, because the latch is already in place when the two sides of the latch slot are displaced. The latch completely covers the very area you desire to fuse together.

Our invention is a novel method for fusing together the displaced portions after the latch needle is completely assembled with the latch pivotally mounted on the displaced portions. The resulting latch pivot is an integral pivot which consists of a homogenous single material.

According to the present invention there is provided a method of making a knitting machine needle as claimed in claim 4 of U.K. Patent No. 1425988 in which the controlled heat is applied substantially simultaneously against both opposed extending parts of the wall portions of the blade to melt at least a portion of the extending parts of the wall portion so that molten metal is formed in the residual space between the extending parts.

The invention will hereinafter be further described by way of example with reference to the accompanying drawings in which Figure 1 is a side elevational view, showing a portion of a typical knitting machine needle having a latch; Figure 2 is an enlarged sectional view of the needle of Figure 1, showing a regular pressed latch pivot; Figure 3 is a view similar to Figure 2, but showing an angular pressed latch pivot; Figure 4 is a schematic representation of one method of forming a latch needle pivot latch pivot in accordance with the invention; Figure 5 is a schematic representation of a second method of forming a latch needle latch pivot in accordance with the invention; Figure 6 is an enlarged sectional view showing the a needle formed from the needle of Figure 2 after the use of the method according to the invention and; Figure 7 is a view similar to Figure 6 showing a needle formed from the latch needle of Figure 3.

Like parts in the various figures are referred to by like numbers.

Referring to the drawings, Figure 1, the latch needle includes a blade 10 with a hook 12 on the end of the blade. The latch 14 pivots about pivot 16 extending transfersely across a slot 18.

Figure 2 is an enlarged sectional view of the regular pressed pivot. The latch pivot is formed by placing the latch 14 with the pivot hole of the latch in the proper position within the slot 18. The sides 20 and 22 of the blade 10 are then punched to form the displaced opposite side cylindrical portions 24 and 26. The displaced opposite side cylindrical portions 24 and 26 extend into the pivot hole of the latch 14 and are parallel to the longitudinal axis of the metal blade.

The angular pressedpivot shown in Figure 3 is formed by a slightly different shaped punch from the shape of the punch used to form the regular pressed pivot of Figure 2.

In the angular pressed pivot, the cylindrical portions 28 and 30 are angular with respect to the longitudinal axis of the metal blade.

Unfortunately,a space such as space 32 in Figure 2 or space 34 in Figure 3 usually exists between the two displaced portions.

Spaces 32 and 34 are exaggerated in Figure 2 and Figure 3 respectively for clarity. The spaces usually run from 0.001 to 0.002 inches. The space is caused by the spring back of the metal after the displaced portions are formed by the punch. Previous attempts to weld or fuse the displaced portions together have never been completely satisfactory. Electrical discharge methods often weld segments of the needle not desired to be welded or fail to weld the not-contacting displaced portions. If the needles are mechanically closed together to assure contact of the displaced portions, the latch is often so pinched as to retard its motion. Heat sources other than electricity have been tried but none have proved sufficiently accurate or reliable.

Our new method comprises applying controlled heat from a high energy heat source against both displaced side wall portions to melt at least a portion of each of the side wall portions. The melted metal flows into the space between the side wall portions and then is allowed to solidify to fuse the two displaced wall portions together.

Since these latch needles are very small, it is necesary that the heat source be such as to provide the required and very well defined, accurate, intense heat source. It is now possible to use certain types of laser beams to provide such required very well defined, and accurate heat concentration. It is also possible to use a maser beam. Certain types of electronic beams may also be used.

One method of applying a high energy laser beam to both sides of the latch needle to form the new latch pivot is shown in Figure 4. Flash lamps 40 and 42 surrounding laser rod 44 and mirrors 46 and 48 are included as part of the laser box 50. When the flash lamps 40, 42 fire, they energize the laser 44. The light bounces bak and forth in the rod, and is reflected back into it repeatedly by the end mirrors 46 and 48. During this bouncing, the light is amplified, becoming more and more intense. Mirror 46 is a dense solid mirror, it will reflect but no light can possibly get through. Mirror 48 is a partial mirror, it will reflect up to a certain intensity level but above that level, it will pass the light When the required energy level is reached, mirror 48 transmits and the laser "fires" the light passing through mirror 48.

The light impinges upon a 50-50 beam splitter 52. The beam splitter splits the laser beam into two separate beams 54 and 56 of approximately equal intensity or energy.

Beam 54 is successively reflected by reflecting mirrors 58, 60, and 62; and then passes through aperture 64, and through lens 66, and then focused on one of the displaced portions of the needle 10. Laser beam 56 passes through the beam splitter 52, through aperture 68 and through lens 70 and is focused on the other displaced portion of the needle 10.

Preferably, the displaced portions of the needle 10 are offset slightly from the focal point of the laser beams. When this is done, holes are not drilled into the displaced portions, but the displaced portions are melted at least partially; and the melted metal flows into the space separating the displaced portions; and the melted metal then solidifies to form the unified latch pivot.

A better, simpler and most preferred present form of laser is shown schematically in Figure 5. We have found that it is possible to build a laser which can shoot out of both ends. Such a laser can be made by using two mirrors which are exactly equal. The flash lamps 74 and 76 in laser box 72 and the laser rod 78 operate in the same manner as the flash lamps and laser rod shown in Figure 4.

However, when a particular predetermined energy level is obtained, equal amounts of high energy radiation are transmitted through identical mirrors 80 and 82. And the laser rod 78 fires out of both ends. The laser beams transmitted through identical mirrors 80 and 82 go through identical paths to the latch needle 10. Identical optical paths make a much simpler machine. The laser beam 84 passing through mirror 80 is reduced in size by aperture 86 so that the laserbeam has the desired size for the optical image to be focused on the needle 10. The beam is successively reflected by mirrors 88, 90 and then the beam is focused on one displaced portion of the needle 10 by the lens 92. Similarly, the beam transmitted through mirror 82 is reduced in size by aperture 94 and then successively reflected by mirrors 96 and 98, and then focused by lens 100 on the other displaced portion of the needle 10. As with the embodiment Figure 4, the focused beams could be focused with the displaced portions at the focal point, but preferably the displacd portions are slightly out of focus.

Figure 6 shows an enlarged view of the solid pivot formed by applying our new method to the displaced portions shown in Figure 2. The inwardly displaced portions 24 and 26 which have been hit by the laser beams, each have a portion of its metal melted; and when the metal portions solidify the solidified portion indicated by the number 102 and greatly exaggerated for clarity, is fused to the portions 24 and 26 leaving a concave shape 104 on displaced portion 24 and a concave shape 106 on displaced portion 26. The portion 102 of course is made by the melted parts of displaced portions 24 and 26 flowing into the space between the two and solidifying. Thus the metal portion 102 consists of the same material and the same metal as the material and metal of portions 24 and 26.

Figure 7 shows the resulting solid pivot from the angular pressed pivot shown in Figure 3. A concave shaPe 108 is formed on the outside of displaced portion 28 and a concave shape 110 is formed on the outside of displaced portion 30. The concave shape 108 and 110 result from the flow of melted metal into the sPace between the displaced portions 28 and 30. The solidified melted metal 112 forms the final unitary homogenous solid latch pivot.

WHAT WE CLAIM IS 1. A method of making a knitting machine needle as claimed in claim 4 of U.K. Patent No. 1425988 in which the controlled heat is applied substantially simultaneously against both opposed extending parts of the wall portions of the blade to melt at least a portion of the extending parts of the wall portions so that molten metal is formed in the residual space between the extending parts.

2. A method as claimed in claim 1 in which the high energy heat source is a laser, and therein the laser energy is fired from one side of the laser, the light from the laser is divided into approximately equal parts, with one of said equal parts being directed against one of the extending parts of the wall portions of the blade and the other of said equal parts of the laser light being directed against the other extending part of the wall portions.

3. A method as claimed in claim 1 in which the high energy heat source is a laser, and wherein the laser is fired from both ends, with an equal amount of energy coming from each end, and the energy from one end of the laser is applied against one of the extending parts of the wall portions and the energy from the other end of the laser is applied against the other of the extending parts of the wall portions.

4. A method as claimed in claim 1 in which the high energy heat source comprises a maser.

5. A method of making a knitting machine needle, substantially as hereinbefore particularly described with reference to Figures 1, 2, 4 and 6 of the accompanying drawings.

6. A method of making a knitting machine needle, substantially as hereinbefore particularly described with reference to Figures 1, 3, 4 and 7 of the accompanying drawings.

7. A method of making a knitting machine needle, substantially as hereinbefore particularly described with reference to Figures 1, 2, 5, and 6 of the accompanying drawings.

8. A method of making a knitting machine needle, substantially as hereinbefore particularly described with reference to Figures 1, 3, 5 and 7.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. 10. The beam is successively reflected by mirrors 88, 90 and then the beam is focused on one displaced portion of the needle 10 by the lens 92. Similarly, the beam transmitted through mirror 82 is reduced in size by aperture 94 and then successively reflected by mirrors 96 and 98, and then focused by lens 100 on the other displaced portion of the needle 10. As with the embodiment Figure 4, the focused beams could be focused with the displaced portions at the focal point, but preferably the displacd portions are slightly out of focus. Figure 6 shows an enlarged view of the solid pivot formed by applying our new method to the displaced portions shown in Figure 2. The inwardly displaced portions 24 and 26 which have been hit by the laser beams, each have a portion of its metal melted; and when the metal portions solidify the solidified portion indicated by the number 102 and greatly exaggerated for clarity, is fused to the portions 24 and 26 leaving a concave shape 104 on displaced portion 24 and a concave shape 106 on displaced portion 26. The portion 102 of course is made by the melted parts of displaced portions 24 and 26 flowing into the space between the two and solidifying. Thus the metal portion 102 consists of the same material and the same metal as the material and metal of portions 24 and 26. Figure 7 shows the resulting solid pivot from the angular pressed pivot shown in Figure 3. A concave shaPe 108 is formed on the outside of displaced portion 28 and a concave shape 110 is formed on the outside of displaced portion 30. The concave shape 108 and 110 result from the flow of melted metal into the sPace between the displaced portions 28 and 30. The solidified melted metal 112 forms the final unitary homogenous solid latch pivot. WHAT WE CLAIM IS

1. A method of making a knitting machine needle as claimed in claim 4 of U.K. Patent No. 1425988 in which the controlled heat is applied substantially simultaneously against both opposed extending parts of the wall portions of the blade to melt at least a portion of the extending parts of the wall portions so that molten metal is formed in the residual space between the extending parts.

2. A method as claimed in claim 1 in which the high energy heat source is a laser, and therein the laser energy is fired from one side of the laser, the light from the laser is divided into approximately equal parts, with one of said equal parts being directed against one of the extending parts of the wall portions of the blade and the other of said equal parts of the laser light being directed against the other extending part of the wall portions.

3. A method as claimed in claim 1 in which the high energy heat source is a laser, and wherein the laser is fired from both ends, with an equal amount of energy coming from each end, and the energy from one end of the laser is applied against one of the extending parts of the wall portions and the energy from the other end of the laser is applied against the other of the extending parts of the wall portions.

4. A method as claimed in claim 1 in which the high energy heat source comprises a maser.

5. A method of making a knitting machine needle, substantially as hereinbefore particularly described with reference to Figures 1, 2, 4 and 6 of the accompanying drawings.

6. A method of making a knitting machine needle, substantially as hereinbefore particularly described with reference to Figures 1, 3, 4 and 7 of the accompanying drawings.

7. A method of making a knitting machine needle, substantially as hereinbefore particularly described with reference to Figures 1, 2, 5, and 6 of the accompanying drawings.

8. A method of making a knitting machine needle, substantially as hereinbefore particularly described with reference to Figures 1, 3, 5 and 7.