US2030270A - Loom for weaving - Google Patents

Description

Feb. 11, 1936. R. ROSSMANN LOOM FOR WEAVING Filed May 2'7, 1955 @W'UMWMW im/Ehlwgz fimmwg ,ATFE! Rh] EV.

Patented Feb. 11, 1936 UNITED STATES PATENT OFFlCE LOM Foa WEAYING Rudolf Rossmann, Gauting, near Munich, Ger- 1 many, assignor to firm Tefag Textil-Finanz A. G., Zurich, Switzerland Application May 27, 1933, Serial No. 673,226 In Germany June 6, 1932 Claims. (Cl. 139-183) being then picked in and beaten up by a reed.

With existing looms, however, it is not always possible to produce a satisfactory fabric of the desired width since, in the case, for example, of strongly twisted yarn, if an appreciable space exists between the warp and the shuttle box, the weft thread after being picked into the shed tends to curl in that part of the weft extending between the warp and the shuttle box, this curling tending in some cases to take place even when the weft thread is subjected to considerable braking. As a result, when pirn-carrying shuttles are employed a series of twisted loops are liable to be formed'at the v selvedges of the fabric whilst, in the case of looms employing gripping or nipper shuttles, the ends of the weft threads are cut off too long, the knives being usually arranged adjacent to the shuttle box.

For the purpose of manufacturing several narrow strips of fabric simultaneously in a single loom, it has been proposed to provide a central shuttle box which serves alternately as a catching and projecting box, but the distance between each side the shuttle box and the corresponding warp may still be such as to result in the above difficulties being encountered, so that a faulty weft and an equally faulty selvedge are sometimes produced whilst wastage of weft thread, in the case of looms employing nipper shuttles, is unavoidable. The present invention has for its object to overcome these difficulties.

To this end according to the invention the distance between the shuttle boxes can be adjusted to suit the width of the fabric toibe woven, without necessitating adjustment of the length of the lay or heald bar.

In the case of looms employing gripping or nipper shuttles wherein the weft is picked in from one side only of the warp with the shuttle returning outside the shed, the catching shuttle box may be adjustable to and from the projecting box.

Preferably one or each shuttle box is carried on a supporting member or carriage which can be adjusted along the lay and locked in the position of adjustment. Each supporting member or carriage is then conveniently movable along one or more guide rods arranged so as not to interfere with the operative movement of the lay. The connections between the driven parts on. or in each adjustable carriage and the main 'driving shaft which passes through each carriage is such as to permit adjustment of the said driven parts with the carriage along the main shaft.

Three constructions according to the invention are illustrated somewhat diagrammatically and by way of example in Figures 1, 2 and 3 repectively of the accompanying drawing.

In the construction illustrated in Figure 1, the lay I, carrying the reed 2, is actuated by swords 3a, 3b which are respectively pivoted at 4a and 45 on a fixed part of the loom. Oscillation of the swords 3a and 3b is effected through connecting rods 5a, 5b from cranks 6a, 6b which are rotated by a driving shaft 1.

The shuttle (not shown) is projected to and fro along the lay by pickers 8a, 8b operatively connected by straps 9a, 9b to levers Illa, IOb carried by vertical spindles Ila, Ilb respectively. The spindles Ila, llb are furnished with fingers I2a, IZb which are engaged by cams I30, I31) angular-1y displaced by 180 on a shaft I 4. The shaft I4 is driven from the shaft I so as to rotate at twice the speed of the shaft I whereby the levers Illa, Illb are alternately jerked inwards to project the shuttle through the shed into the shuttle boxes I50, I51).

In accordance with the invention the distance between the shuttle boxes l5a, I5b can be adjusted as desired. To this end, in the construction shown in Figure 1, one or each of the shuttle boxes is adjustable relatively to the lay I, the straps 9a and/or 9b being at the same time lengthened (as shown dotted in Figure l), or

shortened. It is, however, unnecessary to effect any adjustment of the lay I and reed 2 since adjustment of the shuttle box is effected merely by moving the box relatively to these parts.

In the construction shown in Figure 2 the drive of the lay is similar tothat described with reference to Figure 1, but actuation of the shuttle is derived from a cam I5'carried on the shaft 1. The groove in the cam I5 is engaged by a follower I6 carried towards the free end of a finger I'I secured to a spindle I8. An arm I9 on the spindle It lies below the lay I, reed 2 and healds 29 and 30, the rod l9 being operatively connected by straps a, 20b to levers Zia, 2lb pivoted at 22a, 22b. Thearms 2|a, 2017 are connected to the pickers Ba, 8b by straps 9a, 9b.

When the shaft 1 is rotated the arm I 9 is oscillated beneath the lay so as to jerk the levers 2111, Mb alternately inwards and thereby drive the shuttle to and fro along the lay. The shuttle boxes I5a and 15b are carried on supporting members 3la, 31b respectively which can be locked to a frame member 32 having longitudinal slots 33a, 33b engaged by bolts 34a, 34b. The distance between the shuttle boxes l5a, |5b can thus be adjusted as desired by releasing either or both the wing nuts 34a, 34b and moving the supportin members 3la, 311), the thumb nuts 34a, 3412 being thereupon tightened to lock the supporting member 3la, and/or 3Ib in the desired position.

In the construction illustrated in Figure 3, the loom is of the type which employs gripping or nipper shuttles, one shuttle box constituting a driving box being incorporated in a carriage 24a, and the other constituting a catching box being incorporated in a carriage 24b. The carriages 24a, 24b are mounted on parallel guide bars 25 and 26 so that each carriage can be adjusted longitudinally on these bars. The lay I is operated by swords 3a, 3b which are oscillated about their lower ends by a shaft 35. The length of the lay l and of the heald frames 29 and 30 may be chosen as desired since the carriages 24a and 24b carrying the shuttle boxes are not within the range of movement of these parts. The reed 2, which in looms employing nipper shuttles is usually of a length corresponding to the distance between the shuttle boxes, will however have to be adjusted to suit the distance between the carriages.

Parallel to the guide bars 25 and 26 is a shaft 21 whereby the drive is transmitted ,to the moving parts of the loom, such, for example, as the pickers, brake release, etc., the couplings between these driven parts and the drive being such that the carriages 24a and 24b can be adjusted without interrupting the driving connection between the shaft 21 and the said parts.

It will therefore be seen that in a 100m embodying the present invention, the distance between the shuttle boxes can be adjusted in accordance with the Width of the fabric which it is desired to manufacture so that the scope of utility of the loom is increased, twisting of the weft threads in those parts thereof which lie between the selvedge and the shuttle box being prevented whatever the width of the fabric, and, in addition, when the invention is applied to looms employing nipper shuttles, wastage of weft thread will be reduced.

I claim:

1. A loom for weaving having a lay and shuttle boxes associated therewith, individual carriers for said shuttle boxes, a transverse support member mounted on said loom and supporting said carriers and having provisions adapted to render the position of said carriers adjustable with respect to said lay and in accordance with the width of the fabric to be woven.

2. A loom for weaving having a lay and shuttle boxes associated therewith, individual carriers for said shuttle boxes, a transverse support member mounted on said loom and supporting said carriers and having provisions adapted to render the position of said carriers adjustable with respect to said lay and in accordance with the width of the fabric to be woven, and locking means associated with said support member, and carriers for maintaining said carriers in the adjusted position. I

3. A loom for weaving having a lay, shuttle boxes associated therewith, individual carriers for said shuttle boxes, a shuttle driving mechanism for operating the shuttle and associated with said shuttle boxes, carriers and loom, and provisions associated with said carriers and driving mechanism and adapted to render the distance between said shuttle boxes adjustable in accordance with the width of the fabric to be woven.

4. A loom for weaving having a lay, shuttle v boxes associated therewith, individual carriers for said shuttle boxes, a shuttle driving mechanism for operating the shuttle and associated with said shuttle boxes, carriers and loom, and provisions associated with said carriers and driving mechanism and adapted to render the distance between said shuttle boxes adjustable in accordance with the width of the fabric to be woven, said driving mechanism comprising a transverse member extending across said loom and from one to another of said carriers;

'5. In a loom for weaving, a lay, shuttle boxes associated with said lay, said shuttle boxes being individually adjustable as to their position with respect to said lay and in accordance with the width of the fabric to be woven, and a driving mechanism associated with said loom and said shuttle boxes for ejecting the shuttle out of said boxes, said driving mechanism being adjustable to be adapted to the various positions of said shuttle boxes at various widths of the fabric to be woven.

RUDOLF ROSSMANN.

Images