US3763897A - Chain type loom shedding mechanism - Google Patents

Chain type loom shedding mechanism Download PDF

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Publication number
US3763897A
US3763897A US00230317A US3763897DA US3763897A US 3763897 A US3763897 A US 3763897A US 00230317 A US00230317 A US 00230317A US 3763897D A US3763897D A US 3763897DA US 3763897 A US3763897 A US 3763897A
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United States
Prior art keywords
chain
links
loom
shedding mechanism
link
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Expired - Lifetime
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US00230317A
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English (en)
Inventor
Griffith J Dalton
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Bonas Machine Co Ltd
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Bonas Machine Co Ltd
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Publication date
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C13/00—Shedding mechanisms not otherwise provided for
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C2700/00—Shedding mechanisms
    • D03C2700/01—Shedding mechanisms using heald frames
    • D03C2700/0194—Frame-operating devices for ribbon looms

Definitions

  • ABSTRACT [30] Foreign Application priority Data A chain type shedding mechanism for a loom and Mar 2 1971 Great Britain 5 836/71 characterlzed In that pattern forming members are In i the form of profiled chain-like links adapted to be re- [52] U S 139/78 139/329 139/333 movably connected to form endless pattern control [51] 1111 01 130 '13l00 D63: 15/00 chains, said links being connectable in any desired [58] Fie'ld 'g 139/7 79 82 57 manner to enable any desired sequence of movement 13965 or lack of movement of a heald frame.
  • the links are I profiled to cause motion of the heald shaft having an [56] References Cited accurately profiled peripheral surface in accordance Y with a displacement curve of any known form to pro- UNITED STATES PATENTS prise controlled finite acceleration to a cooperating 889,97! 6/1908 Salisbury l39/78 X f ll w r member, 2,935,093 5/1960 Morosini... 139/78 UX 3,603,351 9 1971 Piazzolla 139 79 6 Claims, 7 Drawing Flgures 'Q TmA Q -I F 0& i q 4 ll.
  • heald shaft movement or shedding mechanism It is known in some loom constructions for the heald shaft movement or shedding mechanism to be controlled from accurately profile cams, via operating levers, according to the lifting sequence necessary to achieve the desired weaving pattern.
  • One disadvantage of such a control means lies in the fact that cams can provide only limited pattern repeatability determined mainly by the functional limits to their size.
  • It is also known to control heald shaft movement by providing endless chain-like members upon which are removably mounted'projecting elements suitably spaced along its length and which intermittently engage the heald shaft operatingmeans at the required moment of time in the weaving pattern cycle to cause the desired movement of the heald shaft.
  • a heald shaft control means or loom shedding mechanism characterised in that pattern forming members are in the form of profiled chain-like links adapted to be 'removably connected to form endless pattern control chains, said links being connectable in any desired manner to enable any desired sequence of movement or lack of movement of a heald frame to be achieved,
  • roller 13 which forms part of aheald shaft operating means or loom shedding mechanism such as is for example disclosed in our co-pending British Patent application Ser. No: 5836/7l filed on Mar.
  • the form of the links 10 is dependent upon the action that they are required to control and in the. case in which a dwell period for the heald shaft is required in either an upper shed or a lower shed position the appropriate links 10 (in the arrangement as shown) is one having an outer profile or cam edge 14 of true radius of either of two suitable proportions, the radius being a heald shaftoperating means which operates in the opposed sense.
  • Each link 10 is further provided with end portions 15 of substantially circular shape of radius R adapted to co-operate closely with a correspondingly shaped face .16 spaced around the periphery of a driving sprocket 17 mounted upon driving shaft 18 journalled in the loom frame 19 and driven at an appropriate speed from the loom frame 19 and driven at an appropriate speed from the loom main shaft (not shown).
  • rotation of the driving sprocket l7 will cause a chain formed from links 10 to be driven continuously past the cooperating follower member 13 and the links 10 will be held maintained in close timed relationship with the driving shaft 18 even if operating wear has occured at FIG. 1 is a schematic sideelevation of a loom includ- FIG. 5 is a plan view of a preferred manner of connecting chain-like links together, and
  • FIGS. 6 and;7 are plan views ofalternativeways in which chain-like links may be connected together.
  • chainlike links 10 arranged to be joined together to form an endless articulated chain by means, forexample, of shaped pins 12.
  • the chain-like links l0' are arranged to perform as a pattern-forming means by causing a. re-
  • a chain is formed from a series of pairs of links 10 each link being of thin laminae form, as shown the links 10 are assembled in staggered formation on the pins 12. That is to say the two links 10 of one pair have one link 10 ofthe next pair between them and the other link of that pair at one side of the first pair.
  • This construction of chain effectively provides four rows of laminae and each of these rows is provided with a driving sprocket 17 on the driving shaft 18 and further provided with additional side support sprockets 17A which can conveniently be replicas of driving sprockets 17.
  • Each sprocket 17, 17A is arranged to be mounted on driving shaft 18 such that the rotational phased relationship of the shaped areas 16 of adjacent sprockets 17, 17A is the equivalent of one chain pitch p".
  • This arrangement of sprockets 17, 17A provides lateral support to the links 10 as they pass the co-operating follower member 13.
  • the proportions of the links 10 are such that the line of action L" passing through the centre of the follower member 13 .and the point of contact between the follower member 13 and the profile 11 when continued shall pass intermediate of the centres of radius "R" at each end por- .tion 15 of the link 10.
  • the refollower member 13 will ensure correct seating of the link within the shaped area 16 of the driving sprocket 17, whereas if the line of action L when continued were to pass beyond the centre of radius R" then it would be possible for the link 10 to be tipped-up by rotation about radius R within the shaped area 16.
  • each link 10 with an inner profile 20 of shape substantially as shown in FIG. 2, that is to say with relieved regions 21 arranged such that as the continuous length of chain passes from a freely suspended attitude onto the driving sprocket l7 and in the event of there being a slight lateral malalignment between links 10 and driving sprockets 17, then the first point on the sprocket 17 with which contact is made by the chain-link is the extreme outside diameter 23 of the sprocket teeth which are provided with suitably chamfered side faces 24 to cause the malaligned link 10 to be deflected slightly into true engagement position.
  • These chamfered side faces 24 are easily produced during manufacture of driving sprocket 17 by, for example, a turning operation.
  • articulated links 10 it is convenient for the articulated links 10 to be contained wholly within the loom frame 19 suspended from driving sprockets 17 as shown in H6. 1 thereby providing a suitable enclosure within which to retain any lubricant used upon the associated parts and an assembly of articulated links 10 sufficient to permit of a weaving pattern repeating in say 50 picks can be contained in such manner.
  • a rearward extension 25 of the loom frame 19 may be provided for accommodating a chain of links 10 of greater assembled length than that required for a weaving pattern having a repeat of more than say fifty picks.
  • pairs of links 10 may alternate with single links 10 to form a chain having in effect three rows of laminae.
  • pairs of links 10 may be joined together to provide a chain having in effect two rows of laminae.
  • a loom shedding mechanism comprising: a follower member; an endless articulated pattern control chain cooperating with said follower member; and a driving sprocket for said chain; said chain comprising pattern forming members in the form of profiled chain links adapted to be removably connected to form said endless articulated pattern control chain, and being formed from laminae arranged to be assembled in staggered formation, said links being provided with end portions of part circular shape thereby closely to cooperate with correspondingly shaped regions spaced around the periphery of said driving sprocket, said links being connectable in any desired sequence to provide an desired shedding motion, including dwell periods, and said profiled chain links being provided on a peripheral surface of said links and formed in accordance with a displacemene curve of any known form to produce controlled finite acceleration to said cooperating follower member.
  • a loom shedding mechanism as claimed in claim 1 in which the articulated chain links are supported laterally while on said driving sprocket.
  • a loom shedding mechanism as claimed in claim 1 in which the chain links are provided with inner profiles including a pair of relieved regions disposed so as, in use, to cause the chain link to be guided on to a cooperating driving sprocket and to correct any lateral mal-alignment of the link with the sprocket as the link passes from a truly suspended attitude on to the sprocket.
  • a loom shedding mechanism as claimed in claim 2 in which the driving sprocket is provided with a chamfered periphery.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Transmission Devices (AREA)
US00230317A 1971-03-02 1972-02-29 Chain type loom shedding mechanism Expired - Lifetime US3763897A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB583671A GB1375411A (enrdf_load_stackoverflow) 1971-03-02 1971-03-02

Publications (1)

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US3763897A true US3763897A (en) 1973-10-09

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Application Number Title Priority Date Filing Date
US00230317A Expired - Lifetime US3763897A (en) 1971-03-02 1972-02-29 Chain type loom shedding mechanism

Country Status (5)

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US (1) US3763897A (enrdf_load_stackoverflow)
CH (1) CH539148A (enrdf_load_stackoverflow)
DE (1) DE2209774A1 (enrdf_load_stackoverflow)
GB (1) GB1375411A (enrdf_load_stackoverflow)
PL (1) PL82340B1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2309201A (en) * 1996-01-18 1997-07-23 Alliedsignal Deutschland Gmbh Airbag

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB189512950A (en) * 1895-07-04 1895-08-10 Hugh Robert Ross Improvements in Tappets or Treading Motions for Looms.
US889971A (en) * 1907-06-08 1908-06-09 Levi E Salisbury Harness-motion device for looms.
US2935093A (en) * 1955-09-29 1960-05-03 Imatex Ind Machine Tessili S R Device for driving the healds in looms, particularly in tape looms
DE2024055A1 (de) * 1969-06-07 1970-12-23 Developp-Patent-Applications Establishment, Vaduz Schaftmaschine für Webstühle
US3603351A (en) * 1968-03-06 1971-09-07 Giovanni Piazzolla Dobby for looms

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB189512950A (en) * 1895-07-04 1895-08-10 Hugh Robert Ross Improvements in Tappets or Treading Motions for Looms.
US889971A (en) * 1907-06-08 1908-06-09 Levi E Salisbury Harness-motion device for looms.
US2935093A (en) * 1955-09-29 1960-05-03 Imatex Ind Machine Tessili S R Device for driving the healds in looms, particularly in tape looms
US3603351A (en) * 1968-03-06 1971-09-07 Giovanni Piazzolla Dobby for looms
DE2024055A1 (de) * 1969-06-07 1970-12-23 Developp-Patent-Applications Establishment, Vaduz Schaftmaschine für Webstühle

Also Published As

Publication number Publication date
DE2209774A1 (de) 1972-09-14
GB1375411A (enrdf_load_stackoverflow) 1974-11-27
CH539148A (de) 1973-07-15
PL82340B1 (enrdf_load_stackoverflow) 1975-10-31

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