GB2101641A

GB2101641A - Weaving loom

Info

Publication number: GB2101641A
Application number: GB08121842A
Authority: GB
Inventors: John Dalton Griffith
Original assignee: Bonas Machine Co Ltd
Current assignee: Bonas Machine Co Ltd
Priority date: 1981-07-15
Filing date: 1981-07-15
Publication date: 1983-01-19
Also published as: CH656903A5; JPH0255540B2; JPS5818449A; IT8222408A0; GB2101641B; IT1151996B

Abstract

A rapier loom has a catch needle 12 for knitting the weft yarn 32 or a catch thread, the catch needle 12 including a shaped terminal end hook 16 which, when the needle is moved in one axial direction, picks up the weft and draws it through a loop and then releases the drawn thread onto its shank when moved in the opposite axial direction, obviating the need for a latch on the needle. <IMAGE>

Description

SPECIFICATION Weaving loom The present invention relates to a weaving loom, in particular a needle or rapier weaving loom wherein the weft yarn is inserted from one side of the woven fabric by a needle or rapier.

In such weaving looms it is necessary to catch the weft yarn presented by the inserting needle on the opposite side of the fabric to insertion of the needle. Conventionally, the weft yarn is secured either by forming a knitted loop with the weft yarn or by forming a knitted loop with a catch thread which is wrapped about the weft yarn.

In either of these methods, knitting of the weft yarn or catch thread is usually achieved using a latch needle.

Recent developments in looms have resulted in the operating speed of looms increasing so much so that use of latch needles is now becoming a limiting factor in speed of operation of a loom and also a limiting factor in how long a loom can run before break down due to failure of the latch needle.

According to the present invention there is provided a needle or rapier loom including a catch needle for securing weft yarn by either knitting the weft yarn or a catch thread, the catch needle including no moving parts and includes a shaped terminal end formation which when the needle is moved in one axial direction can pick up thread and draw it through a loop and then release the drawn thread onto its shank when moved in the opposite axial direction.

Various aspects of the present invention are hereinafter described with reference to the accompanying drawings, in which: Figures 1 and 2 are respectively a plan and side view of the terminal end of a needle for use in a loom according to the present invention; Figure 3 is an illustration of knitting the weft yarn in accordance with the present invention; and Figure 4 is an illustration of knitting a catch thread for securing the weft yarn in accordance with the present invention.

Referring initially to Figures 1 and 2 there is shown a knitting needle 12 having an end formation 1 4 which includes a hook portion 1 6 and a channel 18 which extends obliquely across the needle. The terminal end 1 7 of the hook is located within the channel 18 and is positioned below the upper surface 19 of the needle so that yarn lying on the upper surface of the needle and extending substantially perpendicular to the needle's axis may be slid along the needle and over the terminal end formation 14 without being caught by the hook portion.However if yarn 20 is laid obliquely across the needle 12 as seen in Figures 1 and 2 then the yarn 20 on being drawn along the needle towards its terminal end will eventually fall into channel 18 and then be caught by hook portion 1 6. Accordingly, it is possible for the needle 12 to be pushed through a loop to collect a yarn and then withdraw through the loop pulling the picked up yarn therethrough and clearing the loop.

Referring now to Figure 3 there is shown a piece of woven narrow fabric 30 being woven on a loom (not shown) wherein the weft yarn 32 is secured by being formed into knitted loops 33 by a needle 12 as described above. As seen, the needle 1 2 is located so as to reciprocate axially parallel to the edge of the fabric 30. The needle 12 is arranged when moving in one axial direction to pass above the weft yarn 32 which has been laid in for beating up by the weft inserting needle 39.In order to ensure that the portion 40 of the weft yarn extending from the edge of the fabric to the needle 39 passes at an angle sufficiently oblique to the axis of the needle for location of the portion 40 into the channel 1 8 a weft yarn deflection finger 42 is provided, possibly associated with the weft beat up means (not shown) of the loom, which is movable to engage the weft yarn to be beaten up and move it toward the warp yarn shed to thereby ensure that yarn portion 40 extends at an acute angle from the edge of the woven fabric.

When the needle 12 is retracted it engages portion 40 and pulls it through the looped over end 48 of the previous weft insertion to thereby form a knitted stitch. The cycle is then repeated.

In Figure 4, the weft yarn 32 is secured in position by a catch thread 50 which is knitted into loops 51 by a needle 12. The catch thread 50 is guided through a guide eye 54. The guide eye 54 is positioned relative to the edge of the fabric 30 so that the catch thread extends from the edge of the fabric at an acute angle. In use the needle 12 is advanced to penetrate between the weft yarn loop 33 which has been inserted by needle 39 and to pass above but in contact with the catch thread 50. On retraction of the needle 12 the catch thread is drawn by the needle 12 through the weft yarn loop 33 and through a previously formed loop 51 of the catch thread to thereby form a new loop 51. The cycle is then repeated.

Use of the above described needle 1 2 enables the loom to achieve high speeds of operation and enables the loom to be operated for longer periods than previously experienced when using latch needles.

Claims (Flled on 9 July 1982) 1. A needle or rapier loom including a catch needle for securing weft yarn by either knitting the weft yarn or a catch thread, the catch needle including a shaped terminal end formation which when the needle is moved in one axial direction can pick up thread and draw it through a loop and then release the drawn thread onto its shank when moved in the opposite axial direction.

2. A loom according to Claim 1 wherein the catch needle and weft insertion rapier co-operate so that weft yarn is laid across the catch needle at an oblique angle to enable the weft yarn to be caught by the catch needle.

3. A loom according to Claim 2 wherein a weft yarn deflection guide is provided for co-operation

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

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Weaving loom The present invention relates to a weaving loom, in particular a needle or rapier weaving loom wherein the weft yarn is inserted from one side of the woven fabric by a needle or rapier. In such weaving looms it is necessary to catch the weft yarn presented by the inserting needle on the opposite side of the fabric to insertion of the needle. Conventionally, the weft yarn is secured either by forming a knitted loop with the weft yarn or by forming a knitted loop with a catch thread which is wrapped about the weft yarn. In either of these methods, knitting of the weft yarn or catch thread is usually achieved using a latch needle. Recent developments in looms have resulted in the operating speed of looms increasing so much so that use of latch needles is now becoming a limiting factor in speed of operation of a loom and also a limiting factor in how long a loom can run before break down due to failure of the latch needle. According to the present invention there is provided a needle or rapier loom including a catch needle for securing weft yarn by either knitting the weft yarn or a catch thread, the catch needle including no moving parts and includes a shaped terminal end formation which when the needle is moved in one axial direction can pick up thread and draw it through a loop and then release the drawn thread onto its shank when moved in the opposite axial direction. Various aspects of the present invention are hereinafter described with reference to the accompanying drawings, in which: Figures 1 and 2 are respectively a plan and side view of the terminal end of a needle for use in a loom according to the present invention; Figure 3 is an illustration of knitting the weft yarn in accordance with the present invention; and Figure 4 is an illustration of knitting a catch thread for securing the weft yarn in accordance with the present invention. Referring initially to Figures 1 and 2 there is shown a knitting needle 12 having an end formation 1 4 which includes a hook portion 1 6 and a channel 18 which extends obliquely across the needle. The terminal end 1 7 of the hook is located within the channel 18 and is positioned below the upper surface 19 of the needle so that yarn lying on the upper surface of the needle and extending substantially perpendicular to the needle's axis may be slid along the needle and over the terminal end formation 14 without being caught by the hook portion.However if yarn 20 is laid obliquely across the needle 12 as seen in Figures 1 and 2 then the yarn 20 on being drawn along the needle towards its terminal end will eventually fall into channel 18 and then be caught by hook portion 1 6. Accordingly, it is possible for the needle 12 to be pushed through a loop to collect a yarn and then withdraw through the loop pulling the picked up yarn therethrough and clearing the loop. Referring now to Figure 3 there is shown a piece of woven narrow fabric 30 being woven on a loom (not shown) wherein the weft yarn 32 is secured by being formed into knitted loops 33 by a needle 12 as described above. As seen, the needle 1 2 is located so as to reciprocate axially parallel to the edge of the fabric 30. The needle 12 is arranged when moving in one axial direction to pass above the weft yarn 32 which has been laid in for beating up by the weft inserting needle 39.In order to ensure that the portion 40 of the weft yarn extending from the edge of the fabric to the needle 39 passes at an angle sufficiently oblique to the axis of the needle for location of the portion 40 into the channel 1 8 a weft yarn deflection finger 42 is provided, possibly associated with the weft beat up means (not shown) of the loom, which is movable to engage the weft yarn to be beaten up and move it toward the warp yarn shed to thereby ensure that yarn portion 40 extends at an acute angle from the edge of the woven fabric. When the needle 12 is retracted it engages portion 40 and pulls it through the looped over end 48 of the previous weft insertion to thereby form a knitted stitch. The cycle is then repeated. In Figure 4, the weft yarn 32 is secured in position by a catch thread 50 which is knitted into loops 51 by a needle 12. The catch thread 50 is guided through a guide eye 54. The guide eye 54 is positioned relative to the edge of the fabric 30 so that the catch thread extends from the edge of the fabric at an acute angle. In use the needle 12 is advanced to penetrate between the weft yarn loop 33 which has been inserted by needle 39 and to pass above but in contact with the catch thread 50. On retraction of the needle 12 the catch thread is drawn by the needle 12 through the weft yarn loop 33 and through a previously formed loop 51 of the catch thread to thereby form a new loop 51. The cycle is then repeated. Use of the above described needle 1 2 enables the loom to achieve high speeds of operation and enables the loom to be operated for longer periods than previously experienced when using latch needles. Claims (Flled on 9 July 1982)

1. A needle or rapier loom including a catch needle for securing weft yarn by either knitting the weft yarn or a catch thread, the catch needle including a shaped terminal end formation which when the needle is moved in one axial direction can pick up thread and draw it through a loop and then release the drawn thread onto its shank when moved in the opposite axial direction.

3. A loom according to Claim 2 wherein a weft yarn deflection guide is provided for co-operation with the rapier to position the weft yarn obliquely across the catch needle.

4. A loom according to Claim 3 wherein the deflection guide is movable to engage the weft yarn and move it toward the warp shed.

5. A loom according to Claim 4 wherein the deflection guide is associated with the weft beat up means.

6. A loom according to Claim 1 wherein the catch needle is arranged to knit a catch thread, a catch thread guide being provided for positioning the catch thread to extend obliquely across the catch needle, the rapier being arranged to position the weft yarn so that the catch needle passes through the weft loop created by the rapier to pick up the catch thread.