US3891010A - Let-back mechanism for looms - Google Patents

Let-back mechanism for looms Download PDF

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Publication number
US3891010A
US3891010A US449512A US44951274A US3891010A US 3891010 A US3891010 A US 3891010A US 449512 A US449512 A US 449512A US 44951274 A US44951274 A US 44951274A US 3891010 A US3891010 A US 3891010A
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US
United States
Prior art keywords
pawl
improved
disengagement
hold
fabric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US449512A
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English (en)
Inventor
Jr Merton C Lyman
Ronald Berry
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Draper Corp
Original Assignee
Rockwell International Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rockwell International Corp filed Critical Rockwell International Corp
Priority to US449512A priority Critical patent/US3891010A/en
Priority to DE19752500336 priority patent/DE2500336A1/de
Priority to NL7500973A priority patent/NL7500973A/xx
Priority to FR7504291A priority patent/FR2263322B3/fr
Priority to BE7000620A priority patent/BE826100A/xx
Priority to BR1198/75A priority patent/BR7501198A/pt
Publication of US3891010A publication Critical patent/US3891010A/en
Application granted granted Critical
Assigned to DRAPER CORPORATION, reassignment DRAPER CORPORATION, CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE APRIL 1,1982 Assignors: DELTA ACQUISITION CORPORATION,
Assigned to DELTA ACQUISTION CORPORATION reassignment DELTA ACQUISTION CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ROCKWELL INTERNATIONAL CORPORATION
Assigned to CITICORP INDUSTRIAL CREDIT INC. reassignment CITICORP INDUSTRIAL CREDIT INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DRAPER CORPORATION F/K/A DELTA ACQUISITION CORPORATION
Assigned to STANCHART BUSINESS CREDIT, A CORP. OF CA. reassignment STANCHART BUSINESS CREDIT, A CORP. OF CA. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DRAPER CORPORATION
Assigned to DRAPER CORPORATION, A CORP. OF GEORGIA reassignment DRAPER CORPORATION, A CORP. OF GEORGIA RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CITICORP INDUSTRIAL CREDIT, INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/04—Control of the tension in warp or cloth
    • D03D49/20—Take-up motions; Cloth beams

Definitions

  • the invention relates to looms wherein fabric as it is formed is incrementally advanced by a take-up roll which is rotated by the combination of a ratchet wheel carried on one end thereof and so-called feed and hold back pawls operatively associated with the ratchet wheel.
  • the let-back mechanism for looms of the present invention is an improvement over known let-back mechanisms of the prior art.
  • the instant invention provides a manually operable actuating means for selectively controlling let back of the fabric in increments of single picks. By simple repeated movement of the actuating means the fabric is let back the desired number of picks to correct a given condition prior to restarting the loom.
  • the let-back mechanism is provided with a pivotable lever in the form of a foot pedal having an upwardly directed control rod operatively associated with the pawl members which effect incremental rotation of the ratchet wheel and take-up roll.
  • the control rod is selectively moveable, by depressing the foot pedal, from a rest position to first and second positions of operation. In the first position of operation, the control rod by means of a pivotal lug carried thereon is effective in disengaging the holdback pawl from the teeth of the rachet wheel. When the control rod reaches its second position of operation it is effective by means of an actuating collar fixed thereon in disengaging the feed pawl from the teeth of the ratchet wheel.
  • the return movement of the hold-back pawl is arranged and timed so as to engage a tooth of the ratchet wheel which is immediately adjacent to the tooth from which it was disengaged thereby limiting the reverse movement thereof one tooth of said pick wheel.
  • a further and more specific object of the invention is to provide an improved let-back mechanism for looms which is manually operable and which can be actuated to selectively control let back of the fabric in increments of single picks.
  • FIG. 1 is an elevational view taken from the left hand side of a loom showing the mechanism according to the invention applied thereto,
  • FIG. 2 is a view similar to FIG. 1 showing the disengaging means in that position to effect disengagement of the feed pawl from the ratchet wheel and reengagement of the hold-back pawl therewith, and
  • FIG. 3 is a front view of the loom and mechanism shown in FIG. 1.
  • FIG. 1 a portion of the left hand loomside 10.
  • a bearing member 11 (FIGS. 2 and 3) is fixed to the forward upper portion of the loom by means of bolts 12 and rotatably supports a shaft 13 which extends outwardly beyond the loomside 10 in a direction normal thereto.
  • a handwheel 14 is shown fixed on the outer end of shaft 13 and serves a purpose well known to those conversant in the weaving art.
  • a ratchet wheel 15 Immediately adjacent to the handwheel l4 shaft 13 supports a ratchet wheel 15 which is rotatable therewith.
  • This ratchet wheel is advanced by a feed pawl 16 pivoted at 17 at the upper end of an actuating lever in the form of a two-armed lever 18 which is pivoted on the shaft 13 and which extends downwardly at arm 19 to have connected thereto at a pivot 20 one end of an adjustable link 21 (FIG. 1) by means of which the said pawland arm are oscillated to and fro.
  • the opposite end of this adjustable link 21 is connected at a pivot 22'to the lower arm 23 of a double-armed lever generally indicated at 24, and the second arm 25 thereof has a second adjustable link 26 connected thereto at a pivot 27.
  • This link 26 is reciprocated by means of a crank mechanism 28, although any type of eccentric means may be employed and it is contemplated that said crank or eccentric be adjustable as to its eccentricity thereby to make longer or shorter the throw of links 26 and 21.
  • This advantage can also be obtained by adjusting the pivot 20 at the forward end of the adjustable link 21 in a slot 29 provided in arm 19 of the two-armed lever 18 so that the effective length of that arm may be varied as desired. Additionally the length of both adjustable links 21 and 26 may be varied since the central portions thereof are internally threaded for the assembly of their end portions thereinto and therefor adjustable.
  • a generally U-shaped plate memmber 30 assembles by means of bolts 31 to the forward upper side surface of the loomside 10.
  • a slot 32 is provided in the plate member 30 adjacent its upper end and serves to adjustably and pivotally support a hold-back pawl 33 by means of a pin 34.
  • This hold-back pawl 33 is in the form of a two-armed lever with one arm thereof extending in a generally forward direction which is identified by numeral 35 and provides the means for disengaging said pawl from engagement with the ratchet wheel and will be more fully described hereinafter.
  • a second two-armed lever is pivotally supported on the plate member 30 by means of a pin 36 and includes a first rearwardly extending arcuated arm 37 (FIGS. 1 and 2) which is so disposed as to engage a pin 38 that extends from the sides of the feed pawl 16.
  • This feed pawl is spring biased in the direction of the teeth of the ratchet wheel by means of a coil spring 39 having one end attached to the pin 38 and its opposite end to the upper arm of the two-armed lever 18 as at 40.
  • Hold-back pawl 33 is also spring biased in the direction of the teeth of the ratchet wheel 15 by means of a coil spring 41 having one end attached to said pawl as at 42 in FIG. 3 and its opposite end to a second forwardly extending arm 43 of the second two-armed lever as at 44.
  • the second forwardly extending arm 43 of the second two-armed lever is provided at its forward end with an integrally formed apertured guide 'member 45 through which the disengaging means according to the invention is caused to extend and which is in the form of a pawl control rod 46.
  • a pawl control rod 46 Extending in a generally downwardly direction the pawl control rod 46 is caused to pass through a guide block 47 suitably mounted for swivel movement on a bracket 48 that is fixed to the plate member 30 by means of a bolt 49.
  • the lower end of the pawl control rod 46 being threaded assembles in a bifuracated connector 50 which provides a means for increasing or decreasing the length of said rod.
  • a foot pedal 51 is pivotally attached to the lower forward side of the loomside 10 by means of a bolt 52 and is spring biased in an upwardly direction by means of a coil spring 53 one end of which is attached to the foot pedal as at 54 and the opposite end to a retainer 55 suitably attached to said loomside.
  • the foot pedal 51 is of reduced thickness intermediate its ends as at 56 and the bifurcated end of the connector 50 is pivotally assembled thereto by means of a pin 57.
  • the upper end of the pawl control rod 46 is bifuracated and has a generally L-shaped lug member 58 pivotally assembled between the bifurcation thereof by means of a pin 59.
  • the pawl control rod 46 has an actuating collar 60 fixed thereon by means of a set screw 61.
  • the ratchet wheel 15 is incrementally rotated by the feed pawl 16 which is oscillated to and fro by the two-armed lever 18 and its interconnecting linkage to the crank mechanism 28.
  • the hold-back pawl 33 is arranged and functions in a well known manner to maintain each new position of the ratchet wheel as it is advanced by the feed pawl.
  • This incremental rotation of the ratchet wheel is transmitted by shaft 13 through customary gearing 62 (FIG. 3) which is effective in rotating a take-up roll 63 for advancing fabric as it is formed.
  • the let-back mechanism Before starting the loom after normal shutdown or cessation due to absence of weft, the let-back mechanism is actuated by simply depressing the foot pedal 51.
  • the foot pedal has been depressed a distance which places the pawl control rod 46 in its first position of operation whereat the L-shaped lug member has pivoted the let back pawl out of contact with the teeth of the ratchet wheel by means of its contact with arm 35 of the lever which pivotally supports said pawl.
  • FIG. 2 shows the foot pedal fully depressed which places the pawl control rod 46 in its second position of operation whereat the actuating collar 60 has pivoted arm 43 of the second two-armed lever downwardly so as to raise its arcuated arm 37 which through contact with pin 38 raises the feed pawl 16 out of contact with the teeth of the ratchet wheel 15.
  • an improved means for selectively controlling let back of the fabric in increments of single picks comprising:
  • a. disengaging means mounted on the loom for movement between a rest position and first and second positions of operation;
  • said disengaging means including means for disengagement of the hold-back pawl at the first position of operation and for disengagement of the feed pawl at the second position of operation;
  • biasing means operatively connected to the holdback pawl for effecting its re-engagement with the ratchet after disengagement of the feed pawl therefrom.
  • said disengaging means includes a pawl control rod supported for sliding movement in a generally vertical direction.
  • said means for disengagement of the feed pawl includes an actuating collar fixed to said pawl control rod and a lever member operatively associated with said collar and the feed pawl.
  • said biasing means includes a coil spring having one end connected to the feed pawl and the other to the actuating lever.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US449512A 1974-03-08 1974-03-08 Let-back mechanism for looms Expired - Lifetime US3891010A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US449512A US3891010A (en) 1974-03-08 1974-03-08 Let-back mechanism for looms
DE19752500336 DE2500336A1 (de) 1974-03-08 1975-01-07 Ruecklass-steuereinrichtung fuer eine webmaschine
NL7500973A NL7500973A (nl) 1974-03-08 1975-01-28 Aflaatmechanisme voor een weefgetouw.
FR7504291A FR2263322B3 (https=) 1974-03-08 1975-02-12
BE7000620A BE826100A (nl) 1974-03-08 1975-02-27 Aflaatmechanisme voor een weefgetouw, voorzien van een met hand bedienbaar, samenstel voor het naar keuze pick voor pick aflaten van het weefsel
BR1198/75A BR7501198A (pt) 1974-03-08 1975-02-28 Aperfeicoamento em tear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US449512A US3891010A (en) 1974-03-08 1974-03-08 Let-back mechanism for looms

Publications (1)

Publication Number Publication Date
US3891010A true US3891010A (en) 1975-06-24

Family

ID=23784430

Family Applications (1)

Application Number Title Priority Date Filing Date
US449512A Expired - Lifetime US3891010A (en) 1974-03-08 1974-03-08 Let-back mechanism for looms

Country Status (6)

Country Link
US (1) US3891010A (https=)
BE (1) BE826100A (https=)
BR (1) BR7501198A (https=)
DE (1) DE2500336A1 (https=)
FR (1) FR2263322B3 (https=)
NL (1) NL7500973A (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4766936A (en) * 1985-01-17 1988-08-30 Murata Kikai Kabushiki Kaisha Card switching apparatus for dobby

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1518118A (en) * 1922-07-24 1924-12-02 Draper Corp Let-back mechanism for looms
US1541303A (en) * 1923-06-18 1925-06-09 Crompton & Knowles Loom Works Let-back mechanism for looms
US1854017A (en) * 1931-06-19 1932-04-12 Draper Corp Positive let-back mechanism for looms
US2664115A (en) * 1951-09-22 1953-12-29 Hardy B Gosnell Fabric let back means for looms
US2679268A (en) * 1952-09-17 1954-05-25 Draper Corp Fabric let-back means for looms

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1518118A (en) * 1922-07-24 1924-12-02 Draper Corp Let-back mechanism for looms
US1541303A (en) * 1923-06-18 1925-06-09 Crompton & Knowles Loom Works Let-back mechanism for looms
US1854017A (en) * 1931-06-19 1932-04-12 Draper Corp Positive let-back mechanism for looms
US2664115A (en) * 1951-09-22 1953-12-29 Hardy B Gosnell Fabric let back means for looms
US2679268A (en) * 1952-09-17 1954-05-25 Draper Corp Fabric let-back means for looms

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4766936A (en) * 1985-01-17 1988-08-30 Murata Kikai Kabushiki Kaisha Card switching apparatus for dobby

Also Published As

Publication number Publication date
BR7501198A (pt) 1975-12-02
FR2263322B3 (https=) 1977-10-21
FR2263322A1 (https=) 1975-10-03
BE826100A (nl) 1975-06-16
DE2500336A1 (de) 1975-09-11
NL7500973A (nl) 1975-09-10

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Date Code Title Description
AS Assignment

Owner name: DRAPER CORPORATION,

Free format text: CHANGE OF NAME;ASSIGNOR:DELTA ACQUISITION CORPORATION,;REEL/FRAME:004097/0735

Effective date: 19820920

Owner name: DELTA ACQUISTION CORPORATION; HORNADAY RD., GREENS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ROCKWELL INTERNATIONAL CORPORATION;REEL/FRAME:004113/0020

Effective date: 19820321

AS Assignment

Owner name: CITICORP INDUSTRIAL CREDIT INC., A CORP. OF DE

Free format text: SECURITY INTEREST;ASSIGNOR:DRAPER CORPORATION A CORP. OF GA F/K/A DELTA ACQUISITION CORPORATION;REEL/FRAME:004070/0533

Effective date: 19821021

AS Assignment

Owner name: STANCHART BUSINESS CREDIT, 200 GALLERIA PARKWAY, N

Free format text: SECURITY INTEREST;ASSIGNOR:DRAPER CORPORATION;REEL/FRAME:004539/0198

Effective date: 19860328

AS Assignment

Owner name: DRAPER CORPORATION, GREENSBORO, NORTH CAROLINA A C

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CITICORP INDUSTRIAL CREDIT, INC.;REEL/FRAME:004664/0583

Effective date: 19860331