US852520A - Device for cross-weaving. - Google Patents

Description

No. 852,520. PATENTED' MAY 7, 1907.

- H. T. PESTALOZZI.

DEVICE FOR (moss WEAVING APPLICATION FILED AUG. 23, 1905.

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gauze-half-heald proper.

UNITED STATES PATEN T QFFICE.

DEVICE FOR CROSS-WEAVING.

Specification of Letters Patent.

Patented May '7, 1907.

Application filed August 23, 1905. Serial No. 275,460.

To all whom it may concern.-

Be it known that I, HEINRICH THEODOR PESTALOZZI, a citizen of Switzerland, residing at Zurich, in the Canton Zurich, Switzerland, have invented a new and useful Device for Cross-Weaving, of which the following is a specification.

In gauze weaving the weaver has to work with pairs of warp threads, one of each pair being termed the ground-warp and the other the crossing-warp or whip-warp, so that on the one treadle movement or on one pick the whip warp thread will be brought up on the right side of the ground warp, and that on the next pick the whip warp thread will be brought up on the left side of the ground warp. This has heretofore been accomplished by the employment of a back harness together with a front harness, or in jacquard gauze weaving by the employment of mails serving as a back harness together with mails serving as a front harness.

The back harness has heretofore been made after the manner of a taffeta harness, while the front harness was the gauze harness proper, being composed of guide healds or standards and of gauze-half-healds or doups. Each ground warp and each whip warp was drawn once through a gauze-halfheald. The number of gauze-half-healds was thus equal to the number of ground warp threads plus the number of whip warp threads.

The distinctive feature of the gauze-halfheald proper is, that on the one treadle movement the gauze-half-heald proper is set in motion by the Warp thread (which for its part heretofore was moved by the back harness) and that on the other treadle movement the warp thread is set in motion by the In other words, in the case where the warp thread is moved by another agency than by the gauze-half-heald proper itself (see Figure 2 and consider the work of any gauze-half-heald proper, for instance the work of the gauze-half-heald proper 0 the gauze-half-heald proper follows the warp thread without resistance into the position given to said warp thread by said other agency (in Fig. 2 the warp thread S has been moved, viz. lowered, by 0 while the gauze-half-heald proper 0 which interests us, has followed it without resistance), while in the other case, (see Fig. 3 and consid er again this same gauze-half-heald proper 0 the gauze-half-heald proper itself gives the position to the warp thread (in Fig. 3 it was this very gauze half heald 0 that brought the warp thread S in its position).

In the employment of back harness and front harness the gauze-half-healds perform active work only on the one treadle movement, namely on the so called gauze-treadle movement, drawing apart the warp threads to form a shed: while on the other treadle movement, on the so-called tafiieta-treadle movement, the active work of shedding the warp threads is effected by the back harness, and all the gauze-half-healds proper only passively follow the warp threads.

In the employment of back harness and front harness there is the disadvantage that the harness as a whole, that is, both the back harness and the front-harness together, occupies a lage space measured from the front toward the back, and is therefore inconvenient for many operations. Also in the employment of back harness and front harness, on the movement of the front harness, tension is produced between the back harness and the front harness. The consequences of this tension are increased strain on the warp threads, and increased wear of the harness, and therefore reduced output and increased expenses.

Many attempts have been made to overcome the said draw-backs. For instance gauze-healds with double guidance have been proposed. In such healds, instead of the gauze-half-healds proper a form of gauzehalfhealds, has been used, of which it is ex plicitly stated that on no treadle movement is it operated by the warp, but that on the one treadle movement it is operated by a left-hand guide-heald, and on the other treadle-movement it is operated by a right-hand guide heald..

In the case of gauze healds with double guidance, the back harness may be dis ensed with, but with finer webs the gauze ealds with double guidance cannot be used.

The improved apparatus forming the subj ect of my present invention likewise renders it possible to dispense with the back harness,

and so avoid the drawbacks indicated, while still enabling the finest fabrics to be woven.

Fig. 1 of the annexed drawing shows a portion of an apparatus forming one embodiment of my invention in elevation in the position of rest: Figs. 2 and 3 are elevations showing the apparatus at the end of the two treadle-movements.

As shown, S indicates the. ground warp thread: D the whip warp thread: P, F and F F the guide healds corresponding to the same pair of warp threads: 0 and 0 and a and u? indicate the gauze-half-healds proper corresponding'to the said guide healds. The guide-healds are on shafts which have an in versib le movement due to the treadles. Each ground warp thread and each whip warp thread is drawn through two gauze-hall'- healds proper 0 0 or a m. The number of gauze-half-healds proper is thus twice: the number of ground warp threads plus the number of whip-warp threads.

In operation, when the guide heald F is moved downward, the guide heald F F rises, and vice versa. When F, F is low ered, the gauze-halfheald proper 0 is drawn downwardly therewith, and the ground warp thread S comes, as the gauze-halflheald proper 0 follows S without resistance, downward to the left of the whip warp thread D (Fig. 2). The guide heald W, F rising, the gauze-halfl1eald proper a is raised therewith, and the whip warp thread D comes, as the gauze-half-heald proper a follows it without resistance, to a point upward to the right of the ground warp thread S. If on the other hand the guide heald I, I? be lowered (see Fig. 3) the gauze-half-heald proper 0 is drawn downward therewith, and the ground warp thread S comes, as the gauze-half-heald proper 0 follows it without resistance, downward to the right of the whip warp thread D. The guide heald F, F rising, the gauze-halfheald proper u is raised therewith, and the whip warp thread D comes, as the gauze-halfheald proper a follows it without resistance, to a point upward to the left of the ground shed is formed exclusivelyby means of gauzewarp thread S. From this arrangement, wherein both on the treadle movement here- I tofore called the movement of the gauze treal dle, and on the treadle movement heretofore l called the movement of the taffeta treadle, the

half-healds proper, under otherwise like conditions there are efi'ected reduction in expenses and increase of production. It is evident that the new arrangement may be used in Jacquard looms as well as in shedding motions. The manner of mounting the gauzel half-healds will be understood from Figs. 1,

2 and 3 without further description.

What I do claim asmy invention, and de sire to secure by Letters Patent is 1 In a device for operating the warp threads in gauze weaving, the combination of two gauze-half-healds 0 0 for the whip warp thread and of two gauze-halfhealds a u for the ground warp threads, with two guide healds I F, F W, in such manner that the gauze-half-heald 0 embraces the ground warp thread S and the guide heald 1*, and the gauze-half-heald 11, embraces the whip warp thread D and the guide heald F and that the gauze-half-heald 0 embraces the ground warp thread S and the guide heald I, and the gauzehal'fheald a embraces the whip warp thread D and the gauze-halfheald F In witness whereof I have hereunto signed my name this seventh day of July 1905, in the presence of two subscribing witnesses.

HEINRICH Tl-IEODOR PES'IALOZZI.

1 Witnesses:

VVOLDEMAR HAUPT, WILLIAM MAYNER.

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