US3833027A - Double lift dobby - Google Patents

Double lift dobby Download PDF

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Publication number
US3833027A
US3833027A US00319308A US31930872A US3833027A US 3833027 A US3833027 A US 3833027A US 00319308 A US00319308 A US 00319308A US 31930872 A US31930872 A US 31930872A US 3833027 A US3833027 A US 3833027A
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United States
Prior art keywords
cranks
lever
crank
lifting
arm
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Expired - Lifetime
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US00319308A
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English (en)
Inventor
Z Pavlica
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.)
Elitex Zavody Textilniho
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Elitex Zavody Textilniho
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Publication of US3833027A publication Critical patent/US3833027A/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C1/00—Dobbies
    • D03C1/14—Features common to dobbies of different types
    • D03C1/26—Facilitating engagement of lifting-hooks with draw-knives
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C1/00—Dobbies
    • D03C1/06—Double-lift dobbies, i.e. dobbies in which separate draw-knives or equivalent operate on alternate picks
    • 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
    • D03C2700/0127—Programme-controlled heald frame movement
    • D03C2700/0133—Programme-controlled heald frame movement with mechanical transmission
    • D03C2700/0138—Programme-controlled heald frame movement with mechanical transmission using hooks or lifters
    • D03C2700/0155—Double-lift mechanisms

Definitions

  • Pavlica 4 DOUBLE LIFT DOBBY [75] Inventor: Zdenek Pavlica, Jicin,
  • ABSTRACT v g A double lift dobby for dobby looms, jacquard looms and the like comprising a'first and second double arm crank, each of which is rotatably journaled about independent axes spaced from and parallel to each other.
  • One arm of each of the cranks is provided with latch means for selectively engaging a corresponding one of a driven pair of lifting knives. The cranks are thereby rotatable about their axes by and conjointly with the lifting knife after such engagement.
  • each of the cranks is interconnected with the means for raising and lowering the heald' frame which comprises a lever connected at one end to the first of the cranks and at the other end to the means for lowering the heald frame and a tierod connected atone end of the second ofthe cranks and at its other'end between the ends of the lever.
  • the present invention relates to a double lift dobby loom, jacquard loom and the like and particularly to an arrangement for linking double lift mechanism of the dobby to an associated heald frame.
  • the shedding operation is performed by the cooperative manipulation of the several harness heald frames and the associated hook cords. Conventionally this is accomplished by an arcuately moving lifting knife adapted to engage the hook cords and by a link connected to the heald frame which includes crank means selectively engageable with the lifting knife to transmit the motion of the driven lifting knives to the heald frame.
  • crank means selectively engageable with the lifting knife to transmit the motion of the driven lifting knives to the heald frame.
  • a pair of lifting knives are arranged in associationwith each other and require a pair of corresponding lifting cranks which are interconnected with the means for raising and lowering the heald frame.
  • the interconnection between the two crank levers has generally employed a balancing or levelling lever by which the motion of either or both of the lifting cranks is transmitted to the heald frame.
  • the present invention is directed to an improvement for the form of a dobby mechanism described in our copending application filed on even date herewith corresponding to Czechoslovak patent appli cation No. PV 33-72, dated Jan. 4, 1972, to which reference is made here as if more fully set forth.
  • a double lift dobby for dobby looms, jacquard looms and the like comprising a first and second double arm crank each of which is rotatably journaled about independent axes spaced from and parallel to each other.
  • One arm of each-of the cranks is provided with latch means for selectively engaging a corresponding one of a driven pair of lifting knives.
  • the cranks are thereby rotatable about their axes by and conjointly with the lifting knife after such engagement.
  • each of the cranks is interconnected with the means for raising and lowering the heald frame which comprises a lever connected at one end 'to the first of the cranks and at the other end to the means for lowering the heald frame and a tie rod connected at one end of the second of the cranks and at its other end between the ends of the lever.
  • the means for raising and lowering the heald frame is actuable upon rotation of the distance between the point of connection of the tie rod tothe lever and the point of connection of the lever withthe means for raising and lowering the heald frame to the entire length between the connecting ends of the lever itself. This ratio thus insures the proper transmission of the movement of thecranks.
  • the tie rod is provided so that it may be adjustably positioned at each of its ends to the second crank and-- /or to the lever respectively.
  • the FIGURE is a side view of that portion of a high speed dobby mechanism employing-the present invention.
  • the dobby mechanism comprises a pair of fixed axle shafts la and lb on which are rotatably joumaled double arm crank levers 2 and 3 respectively carrying at their upper ends pivot pins 4a or 4b about which a latching rocker 5a or 5b is secured.
  • the shaft axles la and lb each journal, in addition, a carriertnot seen) on the outer end of whichthere is respectively mounted a lifting knife 6a or 6b.
  • Each of the carriers is provided with means such'as that shown in the aforementioned copending application by which the lifting knives may be given a reciprocatory or oscillatory swinging motion in an arcuate path about a center, which is identical with the center of the shaft axles la and 1b. This center is also identical with the center of arcuate movement of the latches 5a and 5b, as will be obvious from the construction.
  • rocker latches mounted are provided with their own stop means which are adapted to engage and abut a portion of the lifting knife, the lifting knife itself being arranged at a height permitting the inner hook at the end of the latching rocker to be able to be locked over and securely engage the lifting knife for conjoint movement.
  • the lifting hook mounted at the end of its upper arm is depressed to be shifted downwardly by an impulse directed in the direction of the arrow C or D, so that its outer end is removed from the catches 8a or 8b and its inner end is firmly locked in engagement with the appurtenant lifting knife 60 or 6b.
  • the shifting of the rocker latch occurs during the rest dwell of the dobby mechanism as a whole, that is, when the lifting knife abuts against the stop on the upper amt of the crank and when the upper arm of the crank itself abuts against the fixed stops 9a or 9b.
  • the locking of the latching rocker on to the lifting knife thereafter permits the lifting knife 6a or 6b, which is positively driven to oscillate about the center of the axles 1a and 1b, to conjointly carry with it and move in a coincident arcuate path the lifting cranks 2 or 3; turning the lifting crank 3 counter clockwise while turning the lifting crank 2 clockwise.
  • the lifting knives 6a or 612 carry the levers 2 and 3 in the contrary direction swining them outwardly from each other and placing them back to their initial position against the fixed stops 9a and 9b.
  • the springs 7a and 7b again act to lock the latches over the stationary catches 8a and 8b maintaining the lifting cranks 2 or 3 at rest, where they remain so so long as an impulse is not exerted in either of the directions C or D.
  • Each of the lifting cranks is provided with a depending arm extending at an angle away from the arm on which the latches are mounted.
  • the end of the depending arm of the lifting crank 2 is pivotally connected at a point 10 to the end of a tie rod 11 which is pivotally connected at its opposite end 12 to a balancing lever 13.
  • the balancing lever 13 is pivotally connected at one end 14 to the end of the depending arm of the lifting crank 3 and its opposite end 15 at a pivotal connection with a bar or shaft 16 secured by a means arrangement to the heald frame.
  • the balancing lever Upon operation of the dobby to move either or both of the lifting cranks the balancing lever might take one of three variations:
  • the length of the shift of the point 15 between the positions J and K can be adjusted by varying the length of the tie rod 11 or its point of connection 12 on the lever 13. This can easily accomplished by providing the tie rod 11 and the lever 13 with several-receiving holes at each end through which the pins 10 and 12 securing the tie rod to the crank 2 and lever 13 and can be easily inserted.
  • the relationship of the dimensions of the crank arms with respect to the tie rod and lever 13 are of importance with providing the proper swing unto the lever 13 and thus the proper length of actuation of the member 16 so as to lift the heald a predetermined distance. To understand this relationship the following notations have been used in the drawings.
  • . d represents the overall length of the balancing lever 13
  • a represents the length of the depending arm of the lifting crank 2
  • the angle alpha 6! represents the angular deviation of the separate arrns aand b of each of the swinging levers of each of the lifting cranks ,2 and 3.
  • I the length of the resulting lift or swing arc point 12 and the end 15 of the lever .13.
  • the articulated connection created by the lever 13 and the tie rod 11 create a lever system having two fulcrum points.
  • the lever 13 acts as a first order lever.
  • the lever l3 acts as a second order lever. From ther or both the levers can be transmitted directly to the apparatus for raising or lowering the heald without any subsequent multiplication. By selecting the proper dimensions the crank arms and levers as well as the connecting rod the exact can be obtained.
  • a double lift dobby, jacquard loom and the like having a first and a second double arm crank, each crank being rotatably journaled about an axis spaced from and parallel to each other, one arm of each of said cranks being provided with means for selectively engaging one of a pair of driven lifting knives to be rotated thereby about its axis, the other arm of each of said cranks being articulatingly interconnected with the means for raising and lowering the heald frame, said interconnection comprising a lever connected at one end to the first of said cranks and at its other end to the means for raising and lowering the heald frame and a tie rod connected at one end to the second of said cranks and at its other end to the lever between the ends thereof to provide an articulated linkage having a pair of spaced fulcrum points so that one of .said fulcrums-is employed on the actuation of a selected one of said cranks and'wherein said means for raising. and lowering the heald
  • tie rod is adjustably positioned at each end to said second crank and said lever respectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Jib Cranes (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Transmission Devices (AREA)
US00319308A 1972-01-04 1972-12-29 Double lift dobby Expired - Lifetime US3833027A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS3672*#A CS158809B1 (sv) 1972-01-04 1972-01-04

Publications (1)

Publication Number Publication Date
US3833027A true US3833027A (en) 1974-09-03

Family

ID=5331835

Family Applications (1)

Application Number Title Priority Date Filing Date
US00319308A Expired - Lifetime US3833027A (en) 1972-01-04 1972-12-29 Double lift dobby

Country Status (9)

Country Link
US (1) US3833027A (sv)
JP (1) JPS4877157A (sv)
CH (1) CH549667A (sv)
CS (1) CS158809B1 (sv)
DE (1) DE2300032A1 (sv)
ES (1) ES410335A1 (sv)
FR (1) FR2167693B1 (sv)
GB (1) GB1392729A (sv)
IT (1) IT972974B (sv)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130269822A1 (en) * 2011-12-20 2013-10-17 Zhejiang Sanzhi Textiles Co., Ltd. Electronic dobby-and-jacquard-loom weaving machine and weaving method
US10501872B2 (en) * 2015-08-26 2019-12-10 Picanol Drive mechanism for driving a heald frame of a weaving machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS233366B1 (en) * 1982-07-20 1985-03-14 Josef Blazek Apparatus for control of hooks of high-speed rest-less dobby machine
CS236253B1 (en) * 1982-07-20 1985-05-15 Josef Blazek Device for dobby machine's hooks control introducing hooks on carrying blades in accordance with programme

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB657412A (en) * 1945-02-13 1951-09-19 Patra Patent Administration An Dobby for looms
DE959899C (de) * 1951-12-13 1957-03-14 Erich Grosse Doppelhub-Offenfach-Gegenzug-Schaftmaschine
GB853856A (en) * 1957-08-01 1960-11-09 British Cotton Ind Res Assoc Improvements in or relating to looms for weaving
DE1106704B (de) * 1955-02-14 1961-05-10 Felix Tonnar G M B H Doppelhubschaftmaschine, Bauart Hattersley
US3703195A (en) * 1969-08-13 1972-11-21 Staeubli Ag Heddle frame lift device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB657412A (en) * 1945-02-13 1951-09-19 Patra Patent Administration An Dobby for looms
DE959899C (de) * 1951-12-13 1957-03-14 Erich Grosse Doppelhub-Offenfach-Gegenzug-Schaftmaschine
DE1106704B (de) * 1955-02-14 1961-05-10 Felix Tonnar G M B H Doppelhubschaftmaschine, Bauart Hattersley
GB853856A (en) * 1957-08-01 1960-11-09 British Cotton Ind Res Assoc Improvements in or relating to looms for weaving
US3703195A (en) * 1969-08-13 1972-11-21 Staeubli Ag Heddle frame lift device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130269822A1 (en) * 2011-12-20 2013-10-17 Zhejiang Sanzhi Textiles Co., Ltd. Electronic dobby-and-jacquard-loom weaving machine and weaving method
US8794271B2 (en) * 2011-12-20 2014-08-05 Zhejiang Sanzhi Textiles Co., Ltd. Electronic dobby-and-jacquard-loom weaving machine and weaving method
US10501872B2 (en) * 2015-08-26 2019-12-10 Picanol Drive mechanism for driving a heald frame of a weaving machine

Also Published As

Publication number Publication date
CH549667A (de) 1974-05-31
JPS4877157A (sv) 1973-10-17
GB1392729A (en) 1975-04-30
FR2167693B1 (sv) 1977-02-04
IT972974B (it) 1974-05-31
DE2300032A1 (de) 1973-07-19
CS158809B1 (sv) 1974-12-27
FR2167693A1 (sv) 1973-08-24
ES410335A1 (es) 1975-12-01

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