US3442301A - Loom stop motion - Google Patents

Description

May 6, 1969 J. H. NYDAM LOOM STOP MOTION Filed July 27, 1967 NVNTOR' l/H/V V. Mya/4M BY i QM 0M ATTORNEY United States Patent O U.S. Cl. 139-370 5 Claims ABSTRACT OF THE DISCLOSURE A stop motion for looms of the type adapted to insert pre-measured lengths of filling into sheds formed by warp threads having a means for stopping said loom upon detection of the absence of filling or a length of filling which does not completely traverse the width of the shed.

BACKGROUND OF THE INVENTION The invention relates to shuttleless looms in which the ends of pre-measured picks extend from the edge of the fabric in the form of a so-called fringe.

Many mechanisms have been tried or are in use to sense the presence or absence of filling yarn within the warp sheds as fabric is being formed.

Until the introduction of the present invention no positive or satisfactory means has been employed to stop a loom in which a short pick has been inserted or in other words a length of filling yarn which travels beyond the center of its shed but fails to reach the end of its insertion path.

Without an adequate means for detecting a short pick and instantly stopping the loom to correct such a condition, inferior fabric will be formed until this weaving discrepancy is visually detected.

The loom stop motion according to the instant invention provides a means for stopping a loom instantly in the event of absence of filling yarn in the shed or in the event of a so-called short pick which has not traveled its intended distance through and beyond the limits of its particular shed.

A form of filling or weft thread control device for looms of the shuttleless type is shown and described in U.S. Patent 3,260,283. Although the thread control device disclosed in this patent is regarded as the closest prior art, it fails to disclose the positive and non-complex means for stopping a loom as a result of a short or incomplete pick.

SUMMARY OF THE INVENTION The stop motion of the present invention is disposed adjacent the fabric edge and by means of a depending flexible yarn sensing element that forms a part of the looms conventional electrical stop motion circuit, the loom is stopped when filling yarn is lacking by contacting a second element to complete or break said electrical circuit.

The sensing element is in the form of a flexible depending wire loop that is supported by the looms reed and is adapted to function in cooperation with a leno attachment that is disposed in close proximity with that edge of the fabric from which the ends of filling yarn extend.

Prior to the crossing of the leno yarns the ends of each filling yarn inserted are caused to pass through the sheds formed by leno yarn which when crossed securely hold said ends.

As the looms lay moves forwardly with its reed and the sensing element the latter will detect the presence of filling and be deflected rearwardly to avoid contact With the aforementioned second element that would complete the electrical circuit for stopping the loom.

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If the filling is absent, or is not of sufficient length to be held by the yarns of the leno attachment, the sensing element on its forward movement with the reed meets no resistance and will contact the circuits second element or so-called contact member thereby completing the stop motion circuit.

A particular advantage of stopping a loom' in the manner described above enables a weaver to draw out the incomplete picks of yarn and by simply letting back on the take-up the distance taken up by the faulty picks, the loom may again be started without causing a defect in the fabric.

BRIEF DESCRIPTION OF THE DRAWING t FIG. l is a perspective view of a portion of the righthand side of a shuttleless loom showing the stop motion according to the invention applied thereto;

FIG. 2 is a view in side elevation showing the sensing element deflected rearwardly by the presence of filling yarn; and

. FIG. 3 is a view similar to that of FIG. 2 and partially in section showing the sensing element making contact with the contact member to complete the stop motion circuit.

DESCRIPTION OF THE PREFERRED EMBODIMENT Now referring to the figures of drawing enough of a shuttleless loom is shown in FIG. 1 to serve as a basis fOr a. detailed description of the invention applied thereto.

The forward upper right-hand side of a loom shown in FIG. 1 shows a lay beam 10 which is caused to reciprocate to and fro in a known manner during the performance of its intended function.

A reed 11 is secured to the lay 10 and extending in a generally upward direction the dents 12 thereof form the usual openings through which the multiplicity of Warp yarns 13 are adapted to extend.

By means of a conventional harness motion (not shown) the warp yarns 13 are caused to cross alternately to form sheds into which a filling yarn 14 is inserted.

The fabric is identified by numeral 1'5 and the fell thereof by numeral 16.

Temples are disposed in the usual location for maintaining the newly formed fabric at a desired width. The right-hand temple only is shown in FIG. 1 and is identified generally by numeral 17. The temple pod is shown at 18 and the roll itself at 19 which is supported for rotation on a stud 20. Stud 20 is iixedly held lin and extends laterally from one end of a temple support bracket 21. The opposite end of this temple support bracket assembles on a shaft 22 which extends across the width of the loom and provides a means for alignment of one temple with the other. Both the right and left-hand temple support brackets are of similar configuration and as shown in FIG. 2 the right-hand bracket shows a portion of an integrally formed depending lug element 23 which provides a means for attachment of the bracket to the upper forward portion of the looms framework not shown.

A leno attachment (not shown) is provided and the yarns thereof which extend in parallel and spaced relation to the warp yarns 13 are identified by numeral 24.

A stop motion support element 25 is attached to the temple support bracket 21 by means of screws 26 (FIGS. l and 2) and extending in an upwardly direction the upper portion thereof supports a stop motion contact member generally indicated by numeral 27. This contact member includes a core 28 (FIG. 3) assembled within and longitudinally movable with an adjustable sleeve 29. Sleeve 29 is made of a non-conductive material and is threaded for a greater portion of its length as shown in FIG. 2. The threaded portion of this sleeve assembles within a tapped hole 30 (FIG. 2) provided in the upper portion of the support element 25 and by means of an integrally formed knob 31, said sleeve can be turned to move it and the core 28 therein longitudinally relative to the axis of said core.

The core 28 is in the form of a round head bolt with the head portion 32 being unprotected by the sleeve 29. The opposite end of the core is threaded as shown in FIG. 3 and is positioned within the recess 33 of the knob 31. This threaded portion of the core is Provided with a pair of nuts 34 with a terminal connection 35 assembled therebetween.

An electrical lead 36 extending from the terminal connection 35 is in circuit with the looms conventional stop motion and in a manner now to be described will complete the circuit for stopping a loom in the event of a short pick or the absence of a pick.

A contact block 37 is fixed to the upper surface of the reed 11 and adjacent the end thereof as shown in FIG. 1. The forward portion of the block is provided with a sensing element 38 which depends from said block in the form of a wire loop and a number of the leno yarns 24 are adapted to pass through this loop.

Additionally, the contact block is provided with a depending pick engaging member 39 which is disposed in spaced relation to and extends in a plane parallel with the sensing element 38.

In operation, the lay andreed are caused to move to and fro in a known manner and the warp yarns 13 along with the leno yarns 24 are alternately crossed forming sheds into which pre-measured length of filling yarn 14 are inserted.

When the filling yarn is properly inserted it will as shown in FIG. 1 extend through and beyond the sheds formed by the warp and leno yarns. As the lay and reed move forwardly the filling yarn is first contacted by the pick engaging member 39 which serves to straighten the end thereof should it attempt to curve or twist back in the direction of the shed. The yarn is then engaged by the sensing element 38 which deflected rearwardly to avoid contact with the head portion 32 of the core 28.

If filling yarn is lacking, or has not traveled a sufficient distance to enter the leno shed, the sensing element meets no resistance as it moves forwardly with the reed and when contact is made with the head portion 32 by said sensing element, the stop motion circuit is completed t cause a cessation of power to the loom.

The sensing element 38 and contact block 37 are grounded through to the framework of the loom and serve to complete the stop motion circuit when contact is made between said sensing element and the head portion 32 of the core 28.

While one embodiment of the invention has been disclosed, it is to be understood that the inventive concept may be carried out in a number of ways. This invention is, therefore, not to be limited to the precise details described, but is intended to embrace al1 variations and modifications thereof falling with the spirit of the invention and the scope of the claims.

I claim:

1. For a loom including a recipricating lay with a reed for positioning during the forward movement thereof a filling yarn at the fabric fell which is of pre-measured length drawn from an outside source of supply and inserted into and beyond the limits of a shed formed by warp threads and a leno shed formed by leno yarns extending through said reed, a filling yarn stop motion including (a) a sensing element comprising a flexible wire loop carried by a contact block fixed to and movable with said reed for detecting the presence and absence of filling yarn in a shed, said wire loop having a portion of said leno yarns extending therethrough, and

(b) a contact member for completing a circuit for stopping the loom by engaging said sensing element on the forward movement thereof in the event of absence of lling yarn and to resist engagement when filling yarn is present.

2. The mechanism according to claim 1 wherein said contact member is longitudinlly adjustable to and from a position to place it in close proximity with said sensing element in its forward most position.

3. The mechanism according to claim 1 wherein said contact member is electrically insulated to prevent false indications for loom stoppage.

4. The mechanism according to claim 1 wherein said contact member is fixedly positioned relative to said sensing element.

5. The mechanism according to claim 1 wherein said contact block further includes a pick engaging member for contacting the end of the filling yarn to prevent displacement thereof.

Referenees Cited UNITED STATES PATENTS 1,301,280 4/1919 Lanning 139-372 2,389,809 11/1945 Moessinger 139-54 X 2,469,200 5/ 1949 Matweelf 139-372 X 3,215,167 11/1965 Nichols 139-376 3,242,949 3/ 1966 Taticek 139-54 3,260,283 7/1966 Svaty et al 139-370 3,289,709 12/1966 Llado 139-370 FOREIGN PATENTS 1,019,724 2/ 1966 Great Britain.

JAMES KEE CHI, Primary Examiner.

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