US1520434A - Cloth hold down for looms - Google Patents

Description

1,520,434 J. L. PASCHALL CLOTH HOLD DOWN FOR LOOMS Filed Dec. 26, 1922 6 Fig.1. m 3 3 F A), 1 g

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John L. Pascha by MWJIM Anya.

ATENT FFIE.

Patented Dec. 23, 1924.

JOHN L. PASGHALL, OF ST. LOUIS, MISSOURI, ASSIGNOR TO DRAPER CORPORATION, OF I'IOIPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

CLOTH HOLD DOWN FOR LOOll/IS.

Application filed December 26, 1922. Serial No. 608,852.

To all whom it may concern:

Be it known that I, JOHN L. PASOHALL, a citizen of the United States, residing at St. Louis, county of St. Louis City, State of Missouri, have invented an Improvement in Cloth Hold Downs for Looms, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to a cloth hold down for a loom or mechanism for maintaining the tell of the cloth substantially straight when the shed is opened so as to insure a straight path of travel for the shuttle. It is particularly designed for use in connection with a loom for weaving simultaneously two superimposed plies of cloth, as for example when a tubular fabric is woven for the manufacill lure of bags and similar articles.

In a loom of this type, particularly when the shed is opened for the formation of the upper ply of cloth there is a strong tendency to lift the cloth at the fell abnormally. Consequenlly considerable friction is placed upon the shuttle as it is picked through the shed and there is danger of the shuttle catching in the shed. Thus not only is there danper of injury to the cloth, but also more power is required in the operation of the loom.

The object of the. present invention is to provide a simple and eiiicient mechanism for holding down the cloth at the fell in its normal position when the shed is opened.

More specifically the invention comprises a bar adj ustably supported from a fixed portion of the loom frame, such for example as the breast beam, and extending parallel with and immediately forward of the fell in engagement with or close proximity to the upper surface of the cloth so that when the warps are raised in the formation of the shed the bar will act to maintain the cloth at the fell substantially straight.

These and other objects and features of the invention will appear more fully from the accompanying description and drawings and will be particularly pointed out in the claim.

As the invention has to do only with this particular feature of the operation and con struction of the loom and as the invention is applicable. to a wide variety of looms, all of which are well known and familiar to those illustrate or describe any features of the ticularly concerned with the present invention.

In the drawings:

Fig. l is a top plan view of a small portion of a loom showing the breast beam, temples, and cloth and warps together with a preferred form of construction embodying the invention.

Fig. 2 is a view in vertical transverse section of the main portions of the construction shown in Fig. 1;

Fig. 3 is a detail in end elevation of a portion of the construction shown in Figs. 1 and 2.

In the drawings there is shown a portion of the breast beam 1 of a loom, a portion of a take-up roll 2 and a portion of the usual temples The cloth 4 is shown extending from the fell 5 over the take-up roll and wardly from the fell.

The loom is assumed to be one for weaving cloth in two closely superimposed plies indicated at 7 and 8 in Fig. 2. Such a loom is commonly employed for weaving tubular fabric used in the manufacture of bags and similar articles. If the loom of this type is of the simplest form in which each ply is an ordinary straight weave the warps are divided into four sheets 9, 1O, 11 and 12 as indicated in Fig. 2 and when the pick is being made for one ply the shed is formed by moving one sheet as 9 of the warps down and the other three sheets, as 10, 11 and 12, up. Vvhichever shed is formed one sheet of warp is down and three sheets are up. This places a strong upward pull on the cloth at the fell and, particularly in the case of the upper ply, tends to raise or lift the cloth at the fell out of a straight line. Thus there is danger of the shuttle in its path throiiigh the shed catching in the warp and moreover the irregularity or curvature of the warp sheets may place an undue amount of friction on the shuttle. This, as pointed out, may lead to injury or damage to the cloth and in any event increases the power required to pick the shuttle through the shed.

In this invention, in the preferred form illustrated, a bar 13, which may be a rigid flat piece of metal, is mounted parallel with construction of a loom other than those par the warps 6 are shown extending rearskilled in the art it is unnecessary here to ltlll 'the fell immediately forward of the fell and in engagement with or in close proximity to the upper surface of the cloth. This bar preferably extends so as practically to fill the space between the temples. It should be located as close to the fell as possible. In the position illustrated it is assumed to be just forward of the line to which the fell will be forced when the filling is beaten in by the reed.

A suitable means for supporting the bar in this position is illustrated and comprises a bracket 1 L clamped to a rigid portion of the loom frame. For this purpose the bracket is shown clamped to the breast beam at the central portion thereof. The bracket is shown slotted andlitting over the breast beam and locked in place by a set screw 15. This bracket is bifurcated and between the bifurcations is mounted, on a pivot pin 16, an arm 17. The longer portion of this arm 17 extends rearwardly toward the fell and to it is clamped or secured the bar 13. For this purpose the bar 13 is shown provided with a plate 18 clamped to the arm 17 as by bolts 19. The shorter portion of the arm 17 extends forwardly and is provided with a set screw 20 threaded therethrough, and engaging the bracket and held in adjusted position by a lock nut 21. Consequently by adjusting the set, screw 20 the arm 17 may be adjusted on its pivot 16 to move the bar 13 vertically to bring it into the desired position with relation to the cloth.

There is thus provided a very simple and efiicient means for holding down the cloth parallel with and immediately forward of the fell at the upper surface of the cloth which prevents abnormal lifting of the cloth at the fell when the shed is open.

Having thus described my invention, what I claim as new, and desire to secure by Let ters Patent, is:

In aloom having a breast beam, a takeup roll in the rear of and beneath the breast beam, a cloth hold down comprising a bracket, means for securing the bracket to the center of the breast beam, an arm pi-voted in the bracket and extending rearwardly toward the fell, a bar carried by the arm extending each side of the arm and parallel with and immediately forward of the fell in engagement with or close proximity to the upper surface of the cloth, and means for adjustably limiting the upward movement while permitting the downward movement of the arm on its pivot whereby the fell will be maintained substantially straight and be prevented from risingby the bar when the warps are raised in the formation of the shed.

In testimony whereof, I have signed my name to this specification.

JOHN L. PAsoHALLr

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