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EP0084570B1 - Machine a ratiere postive - Google Patents

Machine a ratiere postive Download PDF

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Publication number
EP0084570B1
EP0084570B1 EP19820900152 EP82900152A EP0084570B1 EP 0084570 B1 EP0084570 B1 EP 0084570B1 EP 19820900152 EP19820900152 EP 19820900152 EP 82900152 A EP82900152 A EP 82900152A EP 0084570 B1 EP0084570 B1 EP 0084570B1
Authority
EP
European Patent Office
Prior art keywords
lever
hook
pressure receiving
knife
return
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
Application number
EP19820900152
Other languages
German (de)
English (en)
Other versions
EP0084570A4 (fr
EP0084570A1 (fr
Inventor
Hiroyuki 30-1 Aza-Suginouchi Mizuguchi
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.)
Yamada Dobby Co Ltd
Original Assignee
Yamada Dobby Co Ltd
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 Yamada Dobby Co Ltd filed Critical Yamada Dobby Co Ltd
Publication of EP0084570A1 publication Critical patent/EP0084570A1/fr
Publication of EP0084570A4 publication Critical patent/EP0084570A4/fr
Application granted granted Critical
Publication of EP0084570B1 publication Critical patent/EP0084570B1/fr
Expired legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to positive dobby machines according to the first portion of claim 1.
  • a command device constituted to generate commands corresponding to a fabric pattern acts to rotate the upper and lower hooks pivotally connected respectively to the upper and lower ends of the vertical lever. Therefore, the upper and lower return knives (also referred to as return bars) opposed respectively to the upper and lower ends of the vertical lever are contacted with both ends of the vertical lever directly so as to transmit movement. If the upper and lower return knives were constituted to push the vertical lever through the upper and lower hooks, the pushing force would produce a revolution resistance in the upper and lower hooks and rotation of both hooks according to the command device would be difficult.
  • a positive dobby machine according to the first . portion of claim 1 is disclosed in the document FR-A-2244851.
  • the hooks are pivotally connected to the vertical lever and need cylindrical pressure receiving surfaces which only allow line contact with the planar pressure receiving surfaces of the return bars.
  • An object of this invention is to provide a positive dobby machine in which movement of upper and lower return knives is transmitted to the upper and lower ends of a vertical lever through surface contact means in order to reduce abrasion in transmission portions.
  • Another object of this invention is to provide a positive dobby machine which can be driven at high speed. These objects are achieved with a positive dobby machine as claimed in claim 1.
  • the drawing is a schematic sectional view of a positive dobby machine according to a preferable embodiment of this invention.
  • a stationary shaft 2 has both longitudinal ends fixed to a machine frame (not shown).
  • a plurality of jack levers 1 is arranged in longitudinal direction on the stationary shaft 2 and rotatably supported, the number of the jack levers 1 being the same as that of heald frames (not shown).
  • Each jack lever 1 is provided with a pin 4 to which is pivotally connected a connecting rod (not shown) in a manner similar to conventional positive dobby machines.
  • the connecting rod is connected to a shedding lever (not shown) which, in turn, is connected to a heald frame (not shown) through transmission means.
  • the jack lever 1 is provided with another pin 3 to which a vertical lever 5 is pivotally connected.
  • the vertical lever 5 is formed in vertical symmetry with respect to the pin 3 and has both vertical ends to which an upper hook 6a and a lower hook 6b are connected respectively through pins 37a and 37b.
  • the upper hook 6a and the lower hook 6b are formed in vertical symmetry.
  • First pressure receiving planes 7a, 7b and second pressure receiving planes 8a, 8b are in parallel to each other and formed at both lateral sides of the pins 37a and 37b.
  • the upper hook 6a and lower hook 6b are provided at respective top ends with hooks 9a, 9b and notch portions 29a, 29b.
  • Each of upper stoppers 10a and lower stoppers 10b has both longitudinal ends connected to the machine frame.
  • the upper stopper 10a contacts with the second pressure receiving plane 8a of the upper hook 6a in surface contact state and also the lower stopper 10b contacts with the second pressure receiving plane 8b of the lower hook 6b in similar manner.
  • a driving shaft 12 being as high as the pin 3 has both longitudinal ends rotatably supported on the machine frame and is moved in reciprocal rotating motion by means of driving mechanism (not shown).
  • a driven lever 15 has the same configuration as the driving lever 13 and is pivotally mounted on the machine frame by a pin 14 being as high as the driving shaft 12. Two driven levers 15 are opposed respectively to two driving levers 13.
  • Both longitudinal ends of an upper return knife 16a are pivotally connected to upper ends of two forward and rearward driven levers 15 respectively, and in similar manner both longitudinal ends of a lower return knife 16b are pivotally connected to lower ends of two driven levers 15 respectively.
  • An upper connecting member 17a and a lower connecting member 17b are integrally connected respectively with the right side of both longitudinal ends of the upper and lower return knives 16a, 16b.
  • the right ends of upper and lower connecting members 17a, 17b are integrally connected respectively with the- upper and lower knife shafts 11a, 11b.
  • Distance from the axial center of upper and lower knife shafts 11 a, 11 b to the axial center of upper and lower return knives 16a, 16b opposed thereto is equal to distance between the axial centers of the driving shaft 12 and the pin 14.
  • Parallelogram link mechanism is therefore constituted by the driving lever 13, the driven lever 15 and the upper and lower return knives having the upper and lower connecting members 17a, 17b, so that the upper return knife 16a, the upper connecting member 17a and the upper knife 11a a are integrally moved in parallel, and in similar manner the lower return knife 16b, the lower connecting member 17b and the lower knife shaft 11b are moved in parallel.
  • Pressure receiving planes 18a, 18b in the vertical direction are formed respectively on leftside of the upper and lower return knives 16a, 16b.
  • the upper hook 6a When counterclockwise rotation of the driving lever 13 is stopped, the upper hook 6a is interposed between the pressure receiving plane 18 of upper return knife and the upper stopper 10a, and the pressure receiving plane 18a of upper return knife is contacted with the first pressure receiving plane 7a of the upper hook 6a in surface contact state.
  • the lower hook 6b is interposed between the lower return knife 16b and the lower stopper 10b, and the pressure receiving plane 81 b of lower return knife is contacted with the first pressure receiving plane 7b of the lower hook 6b in surface contact state.
  • the upper knife hook 19a comprises an upward hook 20a engageable with the hook portion 9a of the upper hook 6a at stopping state of counterclockwise rotation of the driving lever 13, a command receiving portion 21 a below the hook portion 20a, a stopper surface 22a formed at right side of the upper knife shaft 11a, a spring hook 23a below the stopper surface 22a, and a projection 24a formed at upper leftside of the upper knife shaft 11 a.
  • Other end of the spring 25 is hung to the spring hook 23a and connected with the upper stay 26a.
  • the upper stay 26a has both longitudinal ends fixed to two upper connecting members 17a respectively.
  • the upper knife hook 19a is urged counterclockwise.
  • An upper stopper shaft 27a has both longitudinal ends fixed on the machine frame.
  • a plurality of upper stoppers 28a are pivotally mounted on the upper stopper shaft 27a. If a pawl 30a at the top end of the upper hook stopper 28a is engaged with a notch 29a of the upper hook 6a, the second pressure receiving plane 8a of the upper hook 6a is contacted with the upper stopper 10a in surface contact state thereby upper end of the vertical lever 5 is held at the left end position.
  • a pressure receiving plane 31a is formed at lower surface of the upper hook stopper 28a.
  • a lower knife hook 19b, a lower stay 26b, a lower stopper shaft 27b, a lower hook stopper 28b and the like are formed in vertical symmetry to the upper hook 19a, the upper stay 26a, the upper stopper shaft 27a, the upper hook stopper 28a and the like.
  • a command device 35 is a known device where an endless card with perforation corresponding to fabric pattern is transferred using a drum, the perforation is detected by a vertical needle, the needle controls height in right end of a horizontal rod, the right end of horizontal rod is pushed by a knife reciprocating in horizontal direction, and an upper command lever 36a and a lower command lever 36b connected to the left end of horizontal rod are operated. While the driving lever 13 finishes to rotate counterclockwise and begins to rotate clockwise, the upper command lever 36a raises the upper knife hook 19a to engage the hook portion 20a with the hook portion 9a, and the knife 19a disengages the upper hook stopper 28a from the upper hook 6a. While the driving lever 13 rotates clockwise, the lower command lever 36b similarly engages the lower hook 6b with the lower knife hook 19b, and the lower knife hook 19b disengages the lower hook stopper 28b from the lower hook 6b.
  • Fig. 1 shows above mentioned attitude where the vertical lever is in the vertical direction, the jack lever 1 stops to rotate counterclockwise, the driving lever 13 and the driven lever 15 also stop to rotate counterclockwise, the upper command lever 36a of the command device 35 engages the upper knife hook 19a with the upper hook 6a, the upper hook stopper 28a is disengaged from the upper hook 6a, and the lower hook stopper 28b is engaged with the lower hook 6b.
  • This state corresponds to attitude of the heald in downward position. If the driving lever 13 rotates clockwise, the upper knife hook 19a pulls the upper hook 6a rightwards, the vertical lever 5 rotates clockwise about the pin 37b and the jack lever 1 also rotates clockwise thereby the heald frame is moved upwards.
  • the driven lever 15 rotates in similar manner to the driving lever 13. If the driving lever 13 and the driven lever 15 begin to rotate counterclockwise, since the upper command lever 36a does not support the upper knife hook 19a then, the upper knife hook 19a is disengaged from the upper hook 6a and rotates counterclockwise until the stopper surface 22a thereof is contacted with the upper stay 26a. Then the upper return knife 16a pushes the upper hook 6a leftwards, the vertical lever 5 rotates counterclockwise about the pin 37b, and the jack lever 1 also rotates counterclockwise, thereby the heald frame is moved downwards.
  • the vertical lever 5 rotates counterclockwise (or clockwise) about the pin 37a (or pin 37b) and reaction force in the fulcrum is received by surface contact of the upper stopper 10a (or lower stopper 10b) with the second pressure receiving plane 8a of the upper hook 6a (or the second pressure receiving plane 8b of the lower hook 6b).
  • Reaction force during downward motion of the heald frame is received by surface contact of the first pressure receiving plane 7a of the upper hook 6a (or the first pressure receiving plane 7b of the lower hook 6b) with the pressure receiving plane 18a of the upper return knife 16a (or the pressure receiving plane 18b of the lower return knife 16b).
  • reaction force during continuous holding of the heald frame in the top dead center is received by surface contact of the first pressure receiving plane 7a of the upper hook 6a with the pressure receiving surface 18a of the upper return knife 16a or by surface contact of the first pressure receiving plane 7b of the lower hook 6b with the pressure receiving plane 18b of the lower return knife 16b. Accordingly, although above mentioned portions in surface contact state are subjected to sliding action because of difference of revolution center positions of members relating to contact planes or fixed state of one plane, the surface contact state causes little abrasion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Claims (4)

1. Machine à ratière positive, comportant un levier de lève (1) pour mouvoir un cadre de lisses, un levier vertical (5) dont la partie centrale (3) est connectée au levier de lève (1) de manière pivotante, des crochets (6a, 6b) connectés de manière pivotante respectivement à l'extrémité supérieure et à l'extrémité inférieure du levier vertical (5), des barres de retour (16a, 16b) pour déplacer les extrémités du levier vertical dans le sens opposé au sens de déplacement des crochets, des arrêts (28a, 28b) pour les crochets (6a, 6b), et des barres d'arrêt (10a, 10b) associées respectivement à l'extrémité supérieure et à l'extrémité inférieure du levier vertical (5); dans laquelle chaque barre de retour (16a, 16b) comporte une surface plane d'appui (18a, 18b) sur son côté faisant face au levier vertical, et dans laquelle un levier entraîné (15) est opposé au levier vertical, un levier entraîneur (13) est couplé au levier entraîné (15) du côté opposé au levier vertical, les centres de pivotement du levier entraîneur (13) celui du levier entraîné (15) et la partie centrale du levier vertical sont approximativement alignés, des arbres à couteau (11 a, 11 b) sont couplés respectivement à l'extrémité supérieure et à l'extrémité inférieure du levier entraîneur (13), les barres de retour (16a, 16b) étant portées respectivement par l'extrémité supérieure et l'extrémité inférieure du levier entraîné (15), des éléments connecteurs (17a, 17b) sont couplés respectivement à une barre de retour (16a, 16b) et à un arbre à couteau (11 a, 11 b) pour former un mécanisme articulé en parallélogramme comprenant le levier entraîneur (13), le levier entraîné (15) et les barres de retour (16a, 16b) rattachées aux éléments connecteurs (17a, 17b) de manière que les barres de retour se déplacent en parallèle, et les surfaces planes d'appui (18a, 18b) des barres de retour (16a, 16b) sont perpendiculaires à la droite reliant les centres de pivotement du levier entraîneur et du levier entraîné; caractérisée en ce que les crochets (6a, 6b) comportent des surfaces planes d'appui (7a, 7b) destinées à s'appuyer contre les surfaces planes d'appui correspondantes (18a, 18b) des barres de retour (16a, 16b).
2. Machine à ratière positive selon la revendication 1, caractérisée en ce qu'un crochet à couteau (19a, 19b) est monté de manière pivotante sur chacun des arbres à couteau (11a, 11 b), ces crochets à couteau étant agencés pour entrer en prise chacun avec l'un des crochets (6a, 6b) et étant actionnés par un dispositif de commande (35).
3. Machine à ratière positive selon la revendication 2, caractérisée en ce que chaque arrêt (28a, 28b) est enclenché par un crochet à couteau (19a, 19b).
4. Machine à ratière positive selon l'une quelconque des revendications précédentes, caractérisée en ce que chaque crochet (6a, 6b) comporte une seconde surface plane d'appui (8a, 8b) qui est opposée et parallèle à la première surface plane d'appui (7a, 7b), et en ce que les barres d'arrêt (10a, 10b) comportent des surfaces planes d'appui pour s'appuyer contre les secondes surfaces planes d'appui (8a, 8b) dans un état de contact superficiel.
EP19820900152 1980-12-29 1981-12-28 Machine a ratiere postive Expired EP0084570B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP185714/80 1980-12-29
JP18571480A JPS6024208B2 (ja) 1980-12-29 1980-12-29 積極ドビ−機

Publications (3)

Publication Number Publication Date
EP0084570A1 EP0084570A1 (fr) 1983-08-03
EP0084570A4 EP0084570A4 (fr) 1984-03-01
EP0084570B1 true EP0084570B1 (fr) 1987-07-22

Family

ID=16175560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820900152 Expired EP0084570B1 (fr) 1980-12-29 1981-12-28 Machine a ratiere postive

Country Status (4)

Country Link
EP (1) EP0084570B1 (fr)
JP (1) JPS6024208B2 (fr)
DE (1) DE3176327D1 (fr)
WO (1) WO1982002216A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61637A (ja) * 1984-06-11 1986-01-06 村田機械株式会社 ドビ−機における読取装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5231987B2 (fr) * 1973-09-21 1977-08-18

Also Published As

Publication number Publication date
EP0084570A4 (fr) 1984-03-01
EP0084570A1 (fr) 1983-08-03
JPS57112429A (en) 1982-07-13
DE3176327D1 (en) 1987-08-27
JPS6024208B2 (ja) 1985-06-12
WO1982002216A1 (fr) 1982-07-08

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