US2405782A - Heald shaft motion for hand looms - Google Patents

Description

Aug. 13, 1946.

P. FLORJANCIC ETAL 2,405,732 HEALD SHAFT MOTION FOR HAND LOOMS File d Dec. 7, 1944 Patented Aug. 13, 1946 UNITED STATE HEALD SHAFT MOTION FOR HAND LOOMS Peter Florjancic and Emil Boral, Zurich, Switzerland, assignors to Max Bucher, Zurich, Switzerland Application December 7, 1944, Serial No. 567,058 In Switzerland July 26, 1943 Claims. (Cl. 13932) I This invention relates to heald shaft motions for hand looms.

In hand 1ooms the number of eccentrics and pedal levers required for the actuation of the heald shaft motions depends upon the number of heald shafts provided, the latter number depending in turn upon the weaveto be produced, that is, t he number of threads to be differently inserted in the repeat of pattern of the weave.

In contrast to the conventional mode of procedure, in the heald shaft motion for hand operated looms, according to the present invention, a plurality of shaft actuating lifting members are turned by a single reciprocatory control lever.

By this means the construction and the opera-j tion of the heald shaft motion is simplified, thereby to simplify the attendance and to increase the efilciency of working. An embodiment of the invention is illustrated by way of example-only in the accompanying drawing in which I Fig. 1 shows a heald shaft motion according to the present invention in elevation;

Fig. 2 shows a partial top plan view of Fig. 1; Fig. 3 shows a part of the heald shaft motion in side elevation on a larger scale;

Fig. 4 is a horizontal section of Fig. 3;

,Fig. 5 is a view of one of the ends of a shaft, and

Fig.6 shows supporting means for the shaft in a longitudinal section.

As shown in Figs. 1 and 2, in the frame of the loom on two-lower rods l and 2 extending parallel to each other, two carriers 3 which extend transversely of said rods are supported and have arranged thereon a pivot 5 by means of bearings 4. On the pivot 5 four lifting cams 6, 1, 8 and 9 are mounted which are united into a block and are connected to the shaft 5 by means of a key l9 for common rotation therewith. With each of the four lifting cams 6 to 9 which have a form similar to a quadrant and are all relatively offset at angles at the center of 90 individual actuating rods H to M respectively cooperate.

The four actuating rods H to M provided are swingably mounted at one of their ends on a bolt l5 which is arranged in common with said rods and is secured to both carriers 3. The other ends of said rods are each connected by means of a cord drive is with one of four shafts l! to 28 respectively, in a known manner.

Each of said shafts I! to 28 which, as shown in Fig. 5, carry healds 22 by means of two shaft staves 2|, carries on both of its ends a stationary supporting bar 23 for interengagement with a tubular guide 24 the lower end of which is closed and which houses a helical spring 25 (Fig. 6).

By means of its two supporting rods 23 each shaft is resiliently supported on the springs 25 in the two respective guide tubes 24. The four guide tubes 24 that are situated at adjacent ends of the shafts I! to 20 are welded together with a common connecting rod 26 of the loom frame. The numeral 21 refers to the slay which is swingably arranged by means of slay swords 28 in a manner known per se and carries the reed 29. The numerals 38 and 3! denote warp threads arriving-from the Warp beam 32. The-cloth beam is referred to. as .33. I

. Ontheshaft 5 carrying the cams 6 to 9 is further arranged a sprocket 34 the rim of which is secured to a hub portion 35 which is connected for rotation with the pivot 5 by a key l8. Between the hub portion 35 and the sprocket rim balls 36 are included so as to form together with said parts a unidirectional coupling, that is, a free wheel hub arrangement. About the rim of the sprocket 34 passes a chain 31 one end of which is attached to a tension spring 38 and the other to a two-armed pedal lever 39. The other end of the tension spring 38 is hooked to a hook 48 which is-fastened onone of the carriers 3. The pedal lever 39 is mounted on the rod 2 and is provided on its lower side with a, set screw 4| which serves as a stop for limiting the throw of the pedal lever 39 by hitting the floor as'this lever moves in the corresponding direction. A set screw 42 arranged on one of the carriers 3 serves as an abutment for limiting the throw of the pedal r lever 39 in the other direction of movement.

The operation of the loom is as follows:

By depressing the pedal lever 39 in the direction of the arrow shown in Fig. 1 the pivot 5 is accordingly turned by action of the chain 31 and consequent stressing of the spring 38, due to the coupling formed by the warp beam then becoming efiective. By way of example it is assumed that the cam 6 is thus rendered operative whereby the associated shaft is moved downward against the influence of the pair of springs 25.

sociated shafts are obviously moved downward. As the individual cams 6 or I, 8, 9 respectively are rendered inoperative the associated shafts return into their upper positions by influence of the associated pair of springs 25.

In the present instance the pivot carrying the cams B to. 9 has performed one revolution after having been controlled four times by means of the pedal lever 39. If a lesser or greater number of cams is provided the throw of the pedal lever 39 is accordingly adjusted to greater or smaller range. Naturally, the angular ranges of the cams about the pivot 5, that is, said ranges of the cams relatively to each other, may be adjustable. The point at which the tension spring 38 is attached to the loom frame may, if desired, be adjustable, for example by means of a sliding member.

The possibility of moving all of the shafts o groups of shafts as a whole through the intermedia ry of a single pedal lever simplifies the work of the attendantperson to a great extent compared with the conventional mode of using both feet for the pedal lever control so that in the event that more than two pedal levers are provided the lever control even requires the feet to be dislocated. In the heald shaft motion according to the present invention the attendant person may control the pedallever w'ith either foot as desired, and in connection therewitnthe heel or the front of the feel: may abut against or be sustained by the floor respectively.

'The relief obtained for the attendant person by means of the heald shaft motion according to the -present invention enables-this person to attend 'to the other work, that is, to the 'weaving operation proper with more concentration of mind and economy of physical strength in consequence whereof the efi'icienc'y of weaving is increased.

The heald shaft "motion according to the pr esent invention requires relatively little space and cost of manufacture, due to being of simpleconstruction, and since the weight bf its movable parts can be kept down the operation of this heald shaft motion "can be -efiected with little effort. owing to the iact that the slay is -Stip-' ported, that is, mounted in hearings at its lower position, and also "for other reasons uppe'r top mountings are avoided, a loom devoid of -'a top 1. In a heald drive means for hand looms, a common cam shaft having a plurality of heald controlling cams mounted thereon, a plurality of heald shafts each corresponding to one of the cams respectively, a single pedal, means connecting the pedal with the cam shaft for operating the cam shaft always in the same direction, and a spring connected with the shaft operating means so as to be stressed by the actuation of the pedal.

2. A heald drive means for hand looms as defined in claim 1, and having means for adjusting the stroke of the pedal.

3. In a heald shaft motion for hand looms, a plurality of heald shafts, a rotary lifting member operatively connected with each of said shafts for actuating said shafts, a unidirectional coupling operatively associated with said lifting members, and a single reciprocatory control 1ever operatively associated with said coupling for rotating said lifting members only in one direction of movement of said control lever by virtue of said unidirectional coupling.

4. In a heald shaft motion for hand looms, a plurality of heald shafts, a rotary lifting member operatively connected with each of said shafts for actuating said shafts, a unidirectional coupling operatively associated with said lifting members, said coupling including a sprocket, a. free wheel hub arrangement included in said sprocket, and a single reciprocatory control lever operatively associated.with said sprocket for rotating said lifting members onlyin one dii'c'ction of movement of said control lever by virtue of said unidirectional coupling,

5. In a heald shaft motion ror hand looms, a plurality of heald shafts a rotary lifting member operatively connected *with each 'of said shafts for actuating said shafts, a unidirectional coupling operatively associated with-said lift ing members, said coupling including a sprocket, a free wheel hub arrangement included in :said sprocket, a rotary pivot provided in :common with said lifting members and said free wheel hub 'arrangenrlexit for jointly rotating said members and said free wheel hub arrangement, and a single reciprocatcry control lever operatively associated with said sprocket for rotating said lifting members only in one direction of movement or said control lever by virtue of said unidirectional coupling. V r

' .PE'I'ER .ELORJANGIC.

EMIL zBORIAL.

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