US2591538A

US2591538A - Loom take-up let-back mechanism

Info

Publication number: US2591538A
Application number: US191900A
Authority: US
Inventors: Hardy B Gosnell
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-10-24
Filing date: 1950-10-24
Publication date: 1952-04-01
Anticipated expiration: 1969-04-01

Description

April 1952 H- B. GOSNELL 2,591,538

LOOM TAKE-UP LET-BACK MECHANISM Filed Oct. 24, 1950 2 SLEETS SI IEET l PwoTEo TO ELEMENT LowEREo WHEN RAISED WHEN LOOM LOOM IS STOPPED ls STOPPED TO DEPRESS LEvER AND APPLY BRAKE z ROOKED BY usu l- MEANS m mm mm LAY April 1952 H. B. GOSNELL 2,591,538

LOOM TAKE-UP LET-BACK MECHANISM Filed Oct. 24, 1950 2 SHEETS-SHEET 2 Iawenoa Hard; BBosnelZ,

fliioa neys Patented Apr. 1, 1952 UNITED STATES EN T OFFICE 6 Claims.

This invention relates to the take-up mechanism ofa loom and has particularly for its object to prevent and eliminate set marks caused by a portion or section of the warps becoming permanently stretched, a condition which is usually caused when the loom is stopped and is inoperative for a period of. time.

The object of the invention is to provide for an efiectively controlled let-back of the take-up roll whenever the loom is either automatically or manually stopped.

Thelet-back mechanisms heretofore provided forthetake-up roll of a loom are commonly operated by a ratchet toothed or pick-wheel advanced by a pawl operated from a moving part of the loom and held against let-back by a holding or detent pawl. Another object of the invention is to provide novel means acting when the loom is stopped to release the actuating pawl of the pick-wheel. And another object of the invention is to provide novel means for controlling. to any required extent the amount of let-back when both the actuating and the detent pawls are released from the pick-wheel.

The invention not only eliminates the occurrence of set marks, due to stretching a section" of the warps when the loom is stopped and remains inoperative for a period of time, but it alsomay be employed to prevent the occurrence of thin places in the weaving which may occur when the loom is momentarily stopped for any reason.

The object of the invention is further to pro videv a mechanism which may be readily reset by the operator with a. minimum of mechanical effort and which is readily accessible to the normal working position of the weaver.

The nature and objects of the invention will appear more fully from the accompanying description and drawings and will be particularly pointed out in theclaims.

Since the invention is applicable to and. readily embodied in a wide variety of looms, and since the construction and. operation of those features of looms which are in any way connected with a mechanism of the present invention, are well known and familiar to those skilled. in the art, it is only necessary to a disclosure ofa preferred form of the present invention to illustrate but a small portion of an ordinary type of loom.

In the drawings:

Fig. 1 is an end elevationof a portion. of a loom adjacent the take-up roll with a construction embodying a preferred form of the invention embodied therein; 7

with the elements in.adifferent position.

A. portion of the. side frame I- of a loom is shown with one of the lay swords 2 and the lay 3.

An ordinary form. of take-up roll 4 is shown mounted in a usual position at the front of the loom and journaled at its end5 in the side frames. This take-up rollis driven from a ratchet toothed pick-wheel 6 mounted together with a handwheel i on a shaft Bjournaled inthe. side frame I.

The principles of the present invention are. applicable to the different forms of take-up mechanism. In. the particular type illustrated the cloth 9 passes down at. the front of theloom directly onto and. is woundupon. the take-uproll. 4, and the take-up r0114 is driven-from the pick-wheel by a train of gearing connecting the p'ick wheel shaft 8 to the take-up roll. Thus the take-up roll. isshown. provided with a large gear Ill,v the shaft-.18. witha pinion H,, andastub shaft. on the side frame I with api'nion i2 intermeshingwith the pinion Band. the gear l0; Thus as the pickwheel is. rotated counterclockwise the takesup roll willlbe rotated counterclockwise to wind'the cloth thereon as illustrated;

The advancing. or. take-upv movement ofthe pick-wheel is illustrated as efiected by a pawl 13 having a-tail' ['4 andful'crumed at l5 upon a carrier lever l6 f'ulcrumed. on the shaft 8. The pawllcarri'er lever 6, like any of the well' know'n pawl-actuating levers employed for advancing the pick-wheel'of a take-up mechanism, maybe rocked by any of the usual'me'ans. in time with the lay, as indicated on the drawings.

The hold-back or detent pawl IT for the pick-. wheel is. shown of a usual construction having an upwardly projecting handle l8 and pivotally supported; in this 'case, on the shaft I91 secured in the loom side frame.

In. the preferred: form of the invention illustrated' the means for releasing, the pawl I3'from the pick-wheel when the loom isstoppedis conveniently associated-with the usual lever, the forward end of which is shown at20, for ap plying the brake to a loom. Such a brake-applying lever'is usually provided with a connection 2! which is lowered, as from the-usual shipper handle, whenever the loom isstopped,v either.

automatically or manually to depress thelever and apply-the loom brake. The pawl, asnoted,v is provided with a tail. [4. A. bracket 221s. ad.- justably mounted on the forward end of the retractable from its position above the pawl tail and means are provided for looking it in retracted position. Thus the plunger 23 is "pro vided at its outer end with a handle 24 and at the inner portion with a washer 25. A spring 28 interposed between the washer 25 and the bracket 22 tends to project the plunger into position over the pawl tail. A pin 21 secured tothe plunger rides in a slot in the bracket and when the plunger is retracted to the position shown in dotted lines it is turned to bring this pin against the end of the frame 22 and thus hold the plungerjin retracted position.

The means illustrated'for releasingth e holdback or detent (I from the pick-wheel, whenever lthe loom is stopped, is illustrated as of a familiar type in which a link 28 is provided at its lower end with 'a 'slot 29 engaging'a pin projecting from the pawl and at its upper end is pivoted to an element raised in the usual manner, as from the shipper handle, when'the loom is stopped either automatically or manually. r' J The invention, as noted, provides extremely accurately adjustable means for oontrolling'the amount of let-back of the pick-wheel when the loom is stopped and consequently the amount of relaxation of the tension on the warps. For this purpose the invention provides an indicator which isyieldingly heldin 'a radial direction against the teeth of the pick-wheel so that as the pick-wheel advances the teeth ride beneath, and in frictional engagement with, the indicator, but when the pick-wheel turns in the opposite. direction the indicator is moved therewith and is thus retractedby its engagement with a tooth of the pick-wheel. In the construction shown the indicator is-inithe form of a small plate 40 mounted to slide at its ends onflthe arms of a wire .loopr ll. The arms Al of this loop are conveniently,at their lower ends, wound about the shaft 8 or the hub of the pickwheelso, as to be pivoted thereon. 1 Coiled springs '42 on the upper end of the arms 4] act to press the indicator in a substantially radial direction. againstthe teeth of the pickwhe'eL: As the pick-wheel is advanced in thenormal operation of the loom the indicator is held against advancing movement by the engagement of the supporting loop with the hub of the detent pawl H, asfshown in full lines, (Fig. l) and thus the advance of the indicator by-its frictional. engagement with the pick-wheel is limited by this hub acting as a forward stop. Whengthe pawls are released from the pickwheel and the pick-wheel lets back or reverses its rotationmovingclockwise, the indicator by its engagement with a tooth of the pick-wheel partakes of this samemovemen't and the extent of this movementfis accurately controlled and limited by the indicator coming into engagement with a rearward stop 43. This rearward stop, in'the preferred form illustrated, has

an arm 44 projecting past the pick-wheel and is adjustably mounted upon an arcuate guide 45 in turn mounted in fixed position adjacent and concentric the pick-wheel. In Fig. 1 the indicator is shown in dotted lines in one retracted position in engagement with the rearward stop 43.

Thus by adjusting the rearward stop along the arcuate guide the let-back movement of the pick-wheeland consequently of the take-up roll may be accurately controlled so as to relax the tension on the warp to any desired degree.

When the loom is restarted and the pawls restored to engagement with the pick-wheel the indicator 4!] is carried by frictional engagement with the teeth of the ratchet wheel from its position against the rearward stop 43 to its forward position against the forward stop and thus is in operative position for the occurrence of a subsequent stoppage of the loom.

It will thus-be seen that whenever the loom is stopped, either automatically or manually, both pawls are released from the pick-wheel and the exactamount of'let-back of the take-up roll and release of warp tension is determined by the position of the rearward stop so that it is under accurate control by the weaver. Moreover, the parts are so positioned that the weaver standing in his normal position at the side of the loom may readily make the required adjustment. Moreover, both pawls are readily accessible so that either may be released and restored to the pickwheel whenever desired. In the case of the pawl 13 it will be noted that the arm 23 on the brakeapplying lever will norm-ally stand above the tail l4 and that the detent pawl I! may be swung by means of the handle i8 out of engagement with the pick-wheel and with its stud 30 riding in the slot 29.

Having thus described the invention, what is claimed as new," and desired to be secured by Letters Patent, is: 1. In a loom take-up roll mechanism in which a ratchet toothed pick-wheel is connected to the take-up roll, in which the pick-wheel and therewith the take-up roll is advanced by a pawl operated from a moving part of the loom, and in which the pick-wheel and therewith the takeup roll is held against let-back by a detent pawl, the combination of means for controlling letback when the pawls are released from the pickwheel consisting of an indicator journaled on the pick -wheel axis and yieldingly held radially against the pick-wheel teeth, a forward stop limiting the'advance of theindicator by its frictional engagement with the pick-wheel, and a rearward stop limiting the retraction of the indicator by its engagement with a tooth of the pick-wheel.

2. The camhination' in a, loom take-up roll mechanism as defined inclaim 1, together with anarcuate guide mounted ingfixed position adjacent and concentric the pick-wheel, and means for'adjustably mounting the rearwardstop on saidguida'jf 3. In a loom take-uproll mechanism in which a ratchet toothed pick-wheel is connected to the take-up roll, in which the pick-wheel .and therewith the take-up roll is advancedby ap'awl having a tail and fulcrumed' upon a carrierlever operated from a moving part of theloomfin which the pick-wheel and therewith the take-up roll is held against let-back by a'detent pawl, and in which when the loom is stopped a leveris depressed to apply a brake, the combinationbf a bracket on the brake-applying lever, an arm extending from the bracket above the pawl tail and v acting upon depression of the brake-applying lever to rock the pawl out of engagement with T the pick-wheel.

4. The combination in a loom take-up.;. 'ol1 of the first pawl out of engagement with the pick-wheel.

5. The combination in a loom take-up roll mechanism as defined in claim 3, together with means acting to release the detent pawl from the pick-wheel simultaneously with the rocking of the first pawl out of engagement with the pickwheel, and means for: controlling the amount of let-back upon the release of both pawls from the pick-wheel.

6. The combination in a loom take-up roll mechanism as defined in claim 3, in which the said arm extending from the bracket consists of a plunger retractable from a position above the pawl tail and means for locking the plunger in retracted position.

HARDY B. GOSNELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 137,188 Estes Mar. 25, 1873 FOREIGN PATENTS Number Country Date 22,277 Great Britain of 1911 121,895 Great Britain Jan. 9, 1919 319,846 Great Britain Oct. 3, 1929