US2485414A

US2485414A - Automatic heald stop motion for dobby looms

Info

Publication number: US2485414A
Application number: US6246A
Authority: US
Inventors: Ruesch Paul
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-11-28
Filing date: 1948-02-04
Publication date: 1949-10-18
Anticipated expiration: 1966-10-18

Description

oet. 1s, 1949. P. RUESCH 2,485,414

AUTOMATIC HEALD STOP-MOTION FOR DOBBY LOOMS Filed Feb. 4, 1948 3 Sheets-Sheet l Qrvucmtofo Paul L/esc/z oct. 1s, 1949. P. RUESCH 2,485,414

AUTOMATIC HEALD STOP-MOTION FOR DOBBY LOOMS Filed Feb. 4, 1948 3 Sheets-Sheet 2 Syvum/fm am! Huesca Oct. 18, 1949. P. RUEscH y 2,485,414

AUTOMATIC HEALD STOP-MOTION FOR DOBBY LOOMS Filed Feb. 4, 1948 I 3 sheets-sheet 5 Paw Z Hueso/z Patented Oct. 1&8, 1` 949 AUTOMATIC HEALD ST-Ql MD'lION FOR DOBBY LOQMS Paul Resch, Tnrbenthail, Switzerland Application February 4, 1948.,.Se11ial No. 624.6 In Switzerland November 2.8 1947 A9 .Claims Mechanical or electrical warp stop motions l`with or Without droppen-s, brought vforward iaith,- erto Within a rather long period of time, .could as a rule not stand the test `of practice on .account of their *limited possibilities of application and intricate design. The adoption .or 'known Warp stop motions been possible Ionly .tor .duits :limited kind of weaving. Thus, for instance. in Wool, jute and linen .weaving .no material progress has been mad-e in the .design .of .the usual warp stop motions.

Now the yobject .or the .present tn-.vention .is a mechanical .or automatic hee-1d .stop Imation for -dobby looms which .is distinguished from known ,warp stop motions that .on each neald frame two racks with upper teeth .are placed in vparallel Which pass with play through all the heald @Ye-S., one rack being mounted firmly in the frame. whilst the rotherfemovable in longitudinal direction with ,respect .to .the ,stationary yone-is at one ond -n driving connection with a lever pivotally supported on the heald frame, a stopdevice rigidly mounted .on the loom trame ,projecting into the motion path of `said lever. whereby .at the vside ,of .the heald vframes opposite the .abutment a cantilever loormnon to ,all heald ,frames is oscllatalzly .arranged on .an axis .rieifllyseouled to the loom framing, which cantilever projects into the vertical motion path ofthe movable rack retained in one extreme 'limit position and is operatively connected to the stop motion of the loom.

The accompanying drawing illustrates by way of example a preferred form of embodiment 'incorporating the invention.

8, through the eyes 9 of which the warps I-0 are passed in the usual Way to -form the shed.

4The rack 5 4and bar I lare supported in bearings II (Figs. l and 2) on the Vertical parts of -the rra-me, -each of them being secured in place :by-a resiiientpin -I2 which engages covering holes of the bearing and the bar. The rack vli vhas tus-h i3 and is of channeled cross-section and receives in its hollow space the ila-t rack B as more particularly shown in Fig. 3, the rack 6 having prismatic l :teeth til substantially of identical height and length. Further', the r-ack 'B is disposed for end- Wise movement in rack -5. Now, another arr-angeme-nt is such that with moving heald frame the rack iIi is displaced in one direction andthen reset by spring action. To ensure ythis movement in -a eontin-ous way, the rack 5 is provided with `spaced holes f through which the dust which may accumulate thereon -is eliminated.

lin the ferm of vembodiment shown, the displacement of the rack 6 'with lowering lheald frame takes place by a stop. For this purpose the rack 6 is at one 'end brought into operative :eng-agement with crank lever t5 pivot-ally mount- -ed Aat lr6 on the 'heald -f-rame, embracing by its xlork -a pin I'I of the rack 6, which pin enters an elongated s'lot I8 of rack 5. A spring member -I-S restores the moved rack B Ito normal. The bellorarrk lever-s I5 on the hea-ld Afra-mes co- ,30 -operate -with stops situated on the loom Wall.

.Fig. l shows an elevation of the left-hand 'half of a 'heald frame;

Fig. Jla. represents an elevation ,of the righthand half of the heald frame with the stop motion of the loom;

Fig. 2 is a vertical section taken on the line .2-2 of Fig. 1a;

Fig. '3 'is a sectional View taken on the 'line 3-'3 of Fig. 1;

Figs. 4, '5 and 6 show various details.

Referring to said annexed drawing, the heald frame I preferably comprises 'horizontalwooden and vertical metallic parts, stirrups r2 being arranged on the former, from which start the Olds or 'belts used for raising and lowering the `heald frames (harness) vertically `guided between vfla'tfhs '3, '4 of the loom. Disposed on l'top within -the frame area of the heald yframes aretwo '

horizontal racks

5, 6 and at the bottom ordinary bar 1 'adapted `to Varrange 'and or to suspend the 'healds Figs. Ail and 5 exhibit, with a small number ofheald frames, a commonly employed stop plate 20 which extends in the direction of the warp, having 4a sloped contact edge 2| conforming in shape 'with the shed. Said plate is secured 'by anangle piece 23 -to-the guide bar 3 firmly seated on the loom 'boa-rd 22, being adjustable vto any direction, especially 4vertically and horizontally, Lby-means o f the

slots

24 and 25.

With an increased number of 'heald frames, the stopplate will lbe replaced by spaced stops '26 Vwhich in number correspond to that of the heald frames, each or them being (individually) adjustable fin height von the horizontally displace- Iable angle piece `23, through slot 21,. Thus, with single manipulation, this arrangement allows of easily obtaining an absolutely uniform shedding.

'llhe action of the -aforedescribed device -is ,as tollows:

1H, withithe loom vin operation, the heald frames Yform the shed, then, 4with lowering sha-its, the arm I5 of the related lbell crank lever I5 strikes against Lthe pla-te 1itl) or one of the stops 26, thus causing the rack -S disposed -in Athe stationary rack 5 to move -to the right -in the direct-ion of the arrow 28, i. e. by more than one tooth pitch, whilstl with rising of the heald frames it is restored to normal by the action of Spring I9. In the shedding the healds I8 are held in the raised position I (Figs. 1 and 3) by the tensioned Warp threads of the lower shed so that the movement of the rack 6 remains without influence on the healds. However, the healds pertinent to the broken warp threads are not kept raised, but fall by their own weight until their eyes 29 lie on the

racks

5, 6 so that these healds are raised by the teeth of rack 6 moving to the right, where they nally drop into a space between the teeth of the stationary rack 5 (see position II in Fig. l). At the start of the return of rack 6, one or more heald eyes 29 become clamped between two teeth of the

racks

5, 6 as in Fig. 6. To ensure this action the eye 29 is provided with a horizontal straight end portion 29. When using a hooked heald the plate forming the eye will be of similar design.

Due to this engagement the rack 6 cannot return to normal, but projects at 3U at the right end, somewhat beyond the heald frame. This incident is utilized for stopping the loom. An example of an arrangement adapted therefor is as follows:

Supported by a straight heald frame guiding bar 4 (attached to the loom) is an upstanding arm 3| which at its head pivotally carries a lever arm 33 on axis 32 and in addition a rigidly mounted arm 34, a resilient carrier pin 35 being provided therebetween to interconnect the said two arms. At one end the loose arm 33 carries a bar-like cantilever 36 which extends Closely at the side of the heald frames arranged in tandem so that the projecting end 39 of the rack 6 of all heald frames acts upon the common cantilever 36. Further, iixed on pivot axis 32 is a lever arm 3l connected through a Bowden wire 38 to the actual stop motion.

According to the illustrated form of embodiment, the stop motion includes the well-known link-motion starting lever 39 pivotally supporting a double lever 4l) weighted at 4I. The Weight 4l is normally retained by a pawl 42 in its raised position, in which the lever 40 is so positioned as to render ineiective a projection 43 on the slay with respect thereto. The Bowden wire 38 leads to the said pawl 42. If upon lift of one or more heald frames the cantilever 36 is carried by the aforementioned rack ends 30, the lever arm '31 is caused to oscillate upwardly in the direction of the arrow, thus tensioning the Bowden wire 38 to release the pawl 42. The falling weight causes a pivotal movement of lever 40 which incidentally enters the range of the projection 43 which upon action of the slay strikes against lever 49 to disengage the starting lever 39 in known manner from a 'link notch, which then is brought to the off position by spring action. Thus the loom is automatically stopped. A compression spring 44 restores pawl 42 and lever arm 31 to normal, an adjustable stop which, for instance, includes a bolt 5I and a contact plate 52, keeping the Bowden wire taut.

Incidental to the stoppage of the loom an indicator or signalling attachment is operated calling the weavers attention to the action of this warp stop motion. The arrangement as an exemplified form of embodiment according to Figs. 1 and 2 is such that a driver or carrier 45 provided on lever arm 31 causes movement of a lever arm 46 having a conspicuously coloured pointer 41 hinged thereto. When acted upon, the pointer projects from a casing into an easily seen position in which it is retained by a shoulder 48.

It is further advantageous to substantially or exactly balance the

lever arm

33, 34 and the cantilever 36 as by means of a weight 49 in order to smooth in so-to-say feeler-fashion, the knock of the rack end 30 on the cantilever 36.

With stopped loom, even with a large number of heald frames the weaver can easily locate any failure of the warp thread. The indicator or signalling attachment 46, 41 indicates above all that the stoppage of the loom is due to the action of the warp stop-motion and not of the weft one. Moreover, the end 30 of the rack 6 projecting laterally of the heald frames (one or more) makes it clear at which heald frame a warp has failed, h

and by the movement of the related rack through the lever arm l5 the location of the thread breakage can be made visible, because the lowered heald hangs there in the teeth of the two racks.

To ensure reliable V,operation it is necessary to determine the healds according to the count of yarn.

The advantages of the aforedescribed warp stop-motion over the existing types are:

l. Optimum simplicity and possibility of adaption; device usable for all kinds of fabrics.

2. Droppers are dispensed with, which means fewer thread breakages. Suppression of cost for positioning vand drawing-in droppers, consequently also easy passage of the warps.

3. No loss of time in connection with locating thread breakage, as the failure is shown in the related heald frame. Poorly sized material cannot impair the stop-motion, since the warp threads are not directly connected to the actual mechanism.

4. Simple supervision for the weaver, since the arrangement includes but a few suitably assembled parts. It can be mounted on all types of looms by the weaving master himself, after brief instructions.

The trend of opinions gathered by practical experience is that due to its special economic properties the arrangement under review will become introduced within a few years in the whole textile industry for all kinds of fabrics, particularly plain ware.

What I claim is:

1. In an automatic heald stop-motion for dobby looms, vertically movable heald frames, two racks with upper teeth arranged in parallel in each frame and passing with play through all the heald eyes, one rack being stationary in the related frame and the other rack being -mounted for endwise movement relative to the stationary rack, a lever pivoted on each frame and connected with the related movable rack, a stop device engageable by each lever moving with the frame to actuate said lever and the movable rack, a cantilever common to the several frames and projecting into the path of the movable rack moving vertically with the frame and retained in the position assumed when actuated by said lever, said cantilever being connected to the stop motion of the loom.

2. An automatic heald stop-motion for dobby looms as claimed in claim 1, wherein the rack stationary in the heald frame is of channeled cross-section, its hollow space receiving the movable rack, said stationary rack being provided with perforations through which the accumulated dust can escape.

3. An automatic heald stop-motion for dobby looms as per claim 1, wherein the stop device includes a plate adjustable to any direction.

4. An automatic heald stop-motion as claimed in claim 1, wherein for looms with an especially large number of heald frames, the stop device includes for each frame a special individuallyl adjustable stop.

5. An automatic heald stop-motion as claimed in claim 1, wherein the stop motion includes a pawl operatively connected through a Bowden wire to a lever which carries the cantilever, said pawl reaching in its one released position the path of the slay, on the action of which the starting lever is returned to its off position.

6. An automatic heald stop-motion as claimed in claim 1, having a movable member of the stop motion in operative connection with a signalling attachment, a lever arm which loosely pivots on an axis being connectable to an arm rigidly mounted on the latter.

'7. An automatic heald stop-motion as claimed in claim 1, wherein each of the healds or hook REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 646,729 Dustin Apr. 3, 1900 651,813 Dustin June 12, 1900 1,892,333 Egli Dec. 27, 1932 Wagner Nov. 9, 1937