US2777470A - Bobbinless loom for weaving ribbons - Google Patents

Description

Jan. 15, 1957 G. VALLAGUZZA BOBBINLESS LOOM FOR WEAVING RIBBONS 2 Sheets-Sheet 1 Filed Feb. 25, 1948 FIG Jan. 15, 1957 e. VALLAGUZZA BOBBINLESS LOOM FOR WEAVING RIBBONS 2 Sheets-Sheet 2 Filed Feb. 25, 1948 IOI ' BOBBINLESS LOOM FOR WEAVING RIBBONS Gisberto Vallaguzza, Milan, Italy; Idelbe Vallaguzza, legal heir of said Gisberto Vallaguzza, deceased Application February 25, 1948, Serial No. 10,688 In Italy December 16, 1946 Section 1, Public Law 690, August a, 1946 Patent expires December 16, 1966 7 Claims. (Cl. 139-124) The present invention relates to weaving looms for tapes, ribbons and like products.

More particularly, the invention relates to a loom designed for the weaving of narrow fabrics wherein a reciprocating needle replaces the usual shuttle. The needle cooperates, in a manner known per se,'with a selvedge spool. paying out a selvedge thread which is interlooped with a weft thread entrained by the needle, thereby producing a finished edge at the side of the fabric remote from the location of the support for the needle.

An object of the present inventionis to provide means for so reciprocating the needle that its movement proceeds in a more convenient direction, i. e. along a trajectory having the configuration of a flat curve located, preferably in the plane of the warp threads, it having been found that under such conditions a smoother selvedge will be obtained under avoidance of undesired loops and other irregularities.

Another object of this invention is to provide means for feeding out selvedge thread from a sufficiently large spool to avoid frequent interruption of the looms operation.

A further object of the invention is to provide means for keeping more nearly constant the tension of the weft and/or selvedge threads.

It is also an object of the present invention to provide means enabling reduction in the size and in the power requirement of a loom of the character described, as well as means affording an increase in output.

According to a further feature of the invention, the needle is reciprocated by means of an articulated frame to which it is secured, the frame including a plurality of parallel arms separately pivoted on a support.

The above and other objects and features of the invention will become apparent from the following detailed description of certain embodiments, reference being had to the accompanying drawings in which:

Fig. 1 is a perspective view, partly in section, of an embodiment of the invention, showing the principal elements thereof;

Fig. 2 is a perspective view, on a larger scale, of those elements of the loom shown in Fig. 1 which participate more immediately in the weaving of the fabric;

Fig. 3 is a top plan view of certain of the elements shown in Fig. 2, including the drive means for reciproeating the needle;

Fig. 4 is a top plan view similar to the left-hand portion of Fig. 3, illustrating a modified form of drive means; and

Fig. 5 is an axial section of a preferred form of a needle adapted to be used in either of the systems shown in Figs. 1-3 and Fig. 4.

Referring first to Figs. 13, there is shown a loom 30 (Fig. 1) for the weaving of narrow fabrics, comprising a needle 1, reciprocable in a horizontal plane in the manner more fully explained hereinafter. A selvedge spool 2 is rotatably mounted in a housing 2a which is 2,777,470 Patented Jan. 15, 1957 journalled in the loom frame 29 for rotation from a beltdriven pulley 9, via a horizontal shaft 8, bevel gears and 11, a vertical shaft 12 carrying a flywheel 20, a crank 21, a link 22, a crank 23, a vertical shaft 24, gears 25, 26, 27 and a stud shaft 28. A lay 31, pivotally mounted at 32, carries the reed 5 adapted to oscillate between the spool housing 211 and the needle 1. Warp threads F (Figs. 2 and 3), controlled by conventional harnesses (not shown) pass horizontally through the reed 5. The reed 5 operates to beat up the weft threads W, entrained by the needle 1, in a manner well known per se.

Fixed on the vertical shaft 12 are two cams 40, 40a

engaged by two roller-carrying arms 41, 41a together constituting a bell crank lever pivoted on the loom frame 29 at 42. Another arm 43, integral with the arms 41 and 41a, is linked via a connecting rod 44 with an arm 45 which, together with a similar arm 46 and a bar 47 interconnecting these two arms 45 and 46, forms an articulated frame. Arms 45 and 46 which are parallel to each other are pivoted at 48, 49, respectively, on the loom frame 29 forming a stationary support. Needle 1 is rigidly secured to the bar 47 by tight fit (within an opening of said bar), which is aided by a set screw clamping said needle in place, as shown.

In Fig. 3 there has been shown in full lines a first or retracted position of the articulated frame 45-46-47, two further positions being indicated in dotted lines. They include an intermediate position in which the parallel arms occupy the positions shown at 45, 46', and an extreme position in which the positions 45', 46' of these arms are indicated at 45", 46" and in Which the needle 1 fully penetrates the warp threads F to move into cooperation with the selvedge spool 2. It will be noted that the trajectory of the point or eye of the needle 1 is a flat curve as indicated at R.

The spool 2 may be generally similar to those conventionally provided in sewing machines, hence its construction and operation need not be described in detail. According to a feature of the invention, however, this spool is provided with a spring 50 adapted to pay out additional selvedge thread S when needed and to take up the slack occurring at certain stages of the operation whereby a substantially constant tension is imparted to the thread S and breaking of the thread, as upon striking the bulging housing 2a, is prevented.

In the embodiment of Fig. 4, the parallel rods are shown at 88, 89 and their pivots at 90, 91, respectively. The linkage 47a supporting the needle 1' corresponds to the bar 47 of the preceding embodiment. Mounted on the shaft 12a are the cams 96 and 97, engaged by the roller-carrying arms 92 and 93, respectively, which, together with a third arm 94 form a unit pivoted on the shaft 42a. Arm 94 is coupled with the arm 88 via a connecting rod 95. The shaft 12a also carries a disk 98a on which is pivoted, at 98, a guide arm 99 for the weft thread which is fulcrumed to the loom frame 2% at 99a.

Fig. 5 illustrates a preferred construction of the needle shown at 1 in Figs. l-3 and at 1 in Fig. 4. According to Fig. 5 the needle comprises a metal rod 100 provided with a ring or eye 101 which is preferably coated with a refractory (e. g. vitreous or ceramic) material, the rod being lodged in the bore of a tubular metal housing 102 and being provided with a collar to which are anchored a pair of springs 103, 104 acting in opposition to each other. It will be understood that the springs 103, 104 resiliently tend to retain the rod 100 in a predetermined position relative to the housing 102, as shown in the drawings.

It will be understood that the dimensions, constructional details, relative arrangement, etc. of the elements disclosed as well as their combination with conventional loom elements, may be varied and that the invention may be modified in various ways Without thereby departing from the scope of the invention as defined in the appended claims. i Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent, is:

1. A weaving loom for tapes, ribbons and like products, comprising a selvedge spool, a reciprocating needle cooperating with said selvedge spool for interlooping a weft thread entrained by said needle with a selvedge thread payed out by said spool, and mechanism for reciprocating said needle with respect to said spool, said mechanism including a stationary support, a plurality of parallel arms separately pivoted on said support, link means interconnecting said arms for parallel movement, said link means and said arms constituting an articulated frame, means rigidly securing said needle to said link means, and drive means coupled with said frame for oscillating said frame with respect to said support.

2. A loom according to claim 1, wherein said drive means comprises a rotatable shaft, cam means on said shaft, and a lever pivoted on said support and provided with three extremities, two ofsaid extremities engaging said cam means from opposite sides, the third of said extremities being coupled with one of said arms.

3. A loom according to claim 1, including a housing for said selvedge spool, said spool being rotatable in said housing and being provided with spring means imparting tension to a selvedge thread leaving said housing.

4. A loom according to claim 1, wherein means are provided for supporting a set of warp threads between said support and said selvedge spool, said warp threads lying in one plane, said articulated frame being mounted on said support for oscillating in said plane.

5. A loom according to claim 4, wherein said articulated frame is mounted on said support for horizontal oscillations.

6. A' loom according to claim 1, wherein said needle comprises a casing having a bore, a rod lodged in said bore and having an end projecting from said casing, said end being provided with an eye, and spring means in said bore tending to maintain said rod in a predetermined position relative to said casing.

7. A loom according to claim 6, wherein said casing and said rod are of metal, said eye being coated with a refractory material.

References Cited in the file of this patent UNITED STATES PATENTS 639,018 Brun Dec. 12, 1899 653,274 Weaver July 10, 1900 719,666 Herzig Feb. 3, 1903 740,903 OReilly Oct. 6, 1903 1,391,958 Kendrick Sept. 27, 1921 1,526,990 Krenz Feb. 17, 1925 FOREIGN PATENTS 21,177 Great Britain of 1909

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