US3851675A - Positive dobby - Google Patents

Positive dobby Download PDF

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Publication number
US3851675A
US3851675A US00343888A US34388873A US3851675A US 3851675 A US3851675 A US 3851675A US 00343888 A US00343888 A US 00343888A US 34388873 A US34388873 A US 34388873A US 3851675 A US3851675 A US 3851675A
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United States
Prior art keywords
draw hook
stop means
draw
hook
positive
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Expired - Lifetime
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US00343888A
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English (en)
Inventor
R Schwarz
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Staeubli AG
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Staeubli AG
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Publication date
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Publication of US3851675A publication Critical patent/US3851675A/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

Definitions

  • ABSTRACT A positive dobby of the Hattersley type comprising a baulk having draw hooks hinged on the ends thereof which are engageable patternlike with back-and-forth movable draw knives, and a pivotable stop beam which tightly presses on the draw hook when in the patternlike lifted normal position and urges same against the stationary bar so that the locking surface of stop beam and draw hook lie, in the engaged condition, between the pivot axis of the draw hook on the I baulk and the pivot axis of the stop beam.
  • the stop beam has a drive mechanism for moving same from its position of the tight, playfree engagement with the draw hook when in the lifted normal position to the position of the abutment of one portion of the stop beam on the upper side of the draw hook which is in a not lifted normal position, through which the stop beam becomes also a press-down beam for the draw hooks.
  • the invention relates to a positive dobby of the Hattersley type comprising a baulk having draw hooks hinged on the ends thereof and which are engageable in a patternlike manner by back-and-forth movable draw knives, a swingable stop beam which presses the draw hook longitudinally when in its lifted normal position, clearance-free against the stationary traverse, whereby opposed longitudinally facing locking surfaces on the stop beam and the draw hook lie, in their engaged condition, between the pivot axis of the draw hook on the baulk and the pivot axis of the stop beam.
  • the draw hook is to be pressed from the lifted position into the carry-along position for the draw knives.
  • the stop beams extend over the entire width of the machine and move with the draw hook being lifted and in the normal position against the longitudinally facing support surfaces of the draw hooks in order to hold the draw hooks longitudinally tightly against a stationary bar. This is done either by a linear movement toward the locking surface or by a downward swinging toward thelifted draw hook.
  • the stop beams move automatically.
  • the springs and transversely positioned beams are not sufficient with respect to the available room, the
  • the purpose of the invention is to provide a device which assures a quick and synchronized sequence of movement, whereby the lifted draw hooks are held tightly and the draw hooks, which must be lowered in a patternlike manner, are lowered positively.
  • the stop beam with a drive mechanism for at least one path of swing from its position of tight, playfree engagement with the draw hook,'when in' the liftednormal position, to a position of abutment of one portion of this stop beam on the upper side of the draw hook as the latter moves toward a lowered normal position, through which the stop beam becomes also the press-down member for the draw hooks.
  • This arrangement makes it possible to both hold the draw hook in a lifted position clearancefree and also to lower same frictionally on the draw knives with only one pivotal member per draw hook row or per draw hook, and to form, at the same time, the clearance which is necessary for the control operation.
  • the stop beam can be divided into as many individual levers as the dobby has bau'lks or draw hooks and each lever has in at least one direction of movement one individual drive mechanism.
  • an individual control of the draw hooks is made possible, that is a control which permits a repeated release of a draw hook in the controlled upper position.
  • each hook will have a lever with a stationary pivot axis and beloaded by a spring associated therewith. The lever and spring will accelerate the draw hook toward the draw knife and delay same in the reversed direction of movement.
  • the oppositely directed support surfaces move away from one another during a pivoting of the lever and the hook and meet again in such a manner that in the second case, the clearance is totally eliminated and, in the first case, the end of the lever will swing out of the way of the path of any hook part, at the same time forming the clearance between this end and the support surface of the draw hook.
  • FIG. 1 is a schematic side view of a portion of a double-lift positive dobby which is mounted on a loom,
  • FIG. 2 illustrates in anenlarged scale the arrangement of the shed-forming parts of adobby of the Hattersley type and a first exemplary embodiment of the invention
  • FIG. 3 illustrates a draw hook of asecond modified embodiment of a stop and press down lever
  • FIG. 4 is the associated front view of the draw hook row and the drive elements, both for individual and also for total drive,
  • FIG. 5 illustrates a draw hook of a third modified embodiment of a stop and press down lever
  • FIG. 6 is the associated front view of the draw hook row.
  • the loom frame 1 supports the heddle frames 2 for vertical movement and the dobby 3.
  • the dobby 3 has a shed-forming device of the Hattersley type (see also FIG. 2) having a baulk 4 with two draw hooks 5, 50 hinged to its ends, per heddle frame.
  • the draw knives 6, 60 are used to draw out the draw hooks, while the draw hooks, in their lifted normal position, are held tightly against the stationary stops 8, 80 by the movable stop knives 7, 70.
  • the numeral 9 identilies the rocking lever and the transmission elements between the dobby and the heddle frame.
  • the stop and'press down lever '7 or is mounted on-a shaft 57 and extends over all draw hooks 5 or 50.
  • Each of the levers 7 or 70 have an arm 77 thereon, the movement of which is controlled by the movable stops 20A.
  • the draw hook 5- is illustrated in the lifted normal position
  • the draw hook 50 is illustrated in the lowered normal position and is ready to be carried along by the draw knife 60.
  • the locking surface 35 of the beam 7 engages the locking surface 65 of the draw hook 5. Both tion corresponding to the lower row of the draw hooks 50.
  • the beam 70 slides thereby off onto the planar surface 34, which planar surface 34 is initially parallel to the straight line I and extends from the locking surface 65 of the draw hook on the side facing the beam 7.
  • the locking surfaces 35, 65 can be angled or can be lightly curved a few degrees (a) for example 4 from a line perpendicular to the straight line I which is equivalent to an inclination a to the tangent to the .arcuate path of the locking surface 65 of the draw hook 5, whereby the locking surfaces project from the tangential surface II toward the draw knife 6. They can also be positioned perpendicularly on the connecting straight line between the pivot axis of the draw hook 5 with the baulk 4 on one side and the pivot axis 57 of the beam 7 on the other side.
  • control of arms 77 can, as shown in the further described modified embodiments, be supplemented in part by springs.
  • one, stop and press down lever 7, 77 is arrangedfor each draw hook 5 along the entire cross shaft 57.
  • the lever has two arms, 7 and 77, whereby the I free end 25 of the arm 7 is rounded to form a roller-like stop point which cooperates with the also rounded locking-surface 55 on the draw hook 5.
  • the other arm 77 extendsinto the space between the fixed stop bar 20 and a movable rail 22.
  • a tension spring 23 is clamped to and extends between the arm 77 and the rail 22.
  • the disadvantage of such uncertainty has been eliminated in the third exemplary embodiment according to FIGS. 5 and 6.
  • the end of the arm 7 is divided into two parts, namely the stop 25 and the finger 26.
  • the stop 25 is constructed in the same manner as in the second above-mentioned exemplary embodiment and cooperates also with the locking surface of the draw hook 5 for the purpose of canceling the clearance between the engaging parts and holding the draw hook in the lifted normal position.
  • the radius of swing of said finger 26 is greater than the radius of swing of the stop 25. This makes it possible that the locking surface 55 of the draw hook 5 is released from and moves beneath the stop 25 in direction of the arrow a during the drawing out movement by the draw knife 6.
  • the lever 7, 77 need not be swung back prior to the movement of the draw knife 6.
  • a draw hook 5 which is moved upwardly by a needle 10 from the lowered (illustrated in dashes) to the lifted (illustrated in full lines) position will press the lever 7, 77 against the action of the spring 23, at the beginning through the finger 26 and later through the stop 25 into the end position.
  • the curved plane of the locking surface 55 of the draw hook 5 gradually meets the stop 25 of the lever 7, 77 until between these two, according to an aspect of the invention, and measured inthe longitudinal direction, clearance 'or play ,no longer exists.
  • the lever 7, 77 has thus taken over the functioning of a stop knife. If one wants to reduce the work which the needle 10 must carry out during a lifting of a draw hook 5, the rail 22 can be moved back and forth, which movement swings back the lever 7, 7.7. It isimportantthat the lever 7, 77 is released after the swinging back movement, before the draw hook 5 starts to move into its lifted position. Thus, the stop 25 of the arm 7 engages the locking surface 55 and the clearancetherebetween is cancelled.
  • the tension spring 23 (HO 4) is used to swing the lever downwardly from the locking position.
  • the swinging back movement is performed by a crank lever 32 which is swingably supported on a shaft 30.
  • the rail 22 is secured'at one end of the crank lever, while the other endcarries a roller 33 which rolls off on a cam plate 36 of the drive shaft.
  • This mechanism serves the drive of the back-and-forth (into and out of the drawing pagev for FIG. 4) movement of the rail 22 in FIGS. 3 and 5 or stop A in FIG. 2.
  • the roller-shaped end can engage the pocket 55 during the upward swinging of the draw hook 5 in such a manner that the draw hook is lifted higher than would be effected merely by the control needle 10.
  • the control needle is therewith completely relieved and can be controlled into a different ready position for the next pick from the needle work.
  • a positive dobby of the Hattersley type comprising:
  • draw hooks extending from and pivoted on the ends of said baulk for patterned movement, said draw hook having a normal, lifted position and a further, lower position;
  • draw knives mounted for back-and-forth movement beneath corresponding draw hooks and engageable with corresponding lowered draw hooks
  • pivotable stop means extending toward and overlying said draw hook and in one position thereof tightly longitudinally pressing against said draw hook in the normal lifted position of the latter for longitudinally urging said draw hook against said stationary member, wherein longitudinally opposed locking surfaces of said stop means and draw hook abut in a tight, play-free manner at a location between the pivot axisjoining said draw hook to said baulk-and the pivot axis of said stop means, said stop means including a portion thereof positively engageable with the upper side of said draw hook for pushing transversely thereon;
  • said stop means comprises a rigid arm extending longitudinally from said stop means pivot, said portion being a lower surface of said rigid arm adjacent the free end thereof, said upper side of said draw hook including a substantially planar surface extending from said draw hook locking surface for positive longitudinal sliding engagement by said arm surface during lowering of said draw hook toward said further, lower position.
  • pivotable stop means comprises as many individual levers as there are adjacent draw hooks
  • drive means comprises, at least for lever movement in one direction, one individual drive mechanism for each lever.
  • said drive means comprises one resilient element engaging the pivotable stop means of a given draw hook, and means locating said element for urging said stop means toward the corresponding draw knife.
  • a positive dobby according to claim 1 including a movable rail having a path of movement in which a part of said pivotable stop means is located for returning said pivotable stop means upwardly to said one position prior to drawing out of the associated draw hook by the corresponding draw knife.
  • said circular cross section surface of said draw hook terminates in a plane surface on the upper draw hook side and facing said pivotable stop means, said stop means portion being at said edge and being slidable on said plane surface during pivotal movement of said stop means.
  • planar surfaces are substantially perpendicular to a further line which. extends through the pivot axis of said pivotable stop means and through the pivot axis of said draw hook on said baulk.
  • a positive dobby according to claim 1 including a control needle for lifting said draw hook toward said normal lifted position and wherein said drive means includes means for pivoting said stop means upwardly, said locking surfaces being so located on said pivotable stop means and draw hook as to interengage during said upward pivoting of said stop means for lifting said draw hook off the fully lifted control needle.
  • said pivotable stop means includes first and second rigidly connected arms extending divergently from the stop means .pivot axis, said stop means engaging said draw hook through the laterally extending one of said arms, the other of said arms engaging said drive means remotely from said pivot axis.
  • said drive means comprises a rail shiftable toward and away from said second arm transversely of the latter, said rail having first end means adjacent said second arm and engageable therewith for positively pivotally returning said first stop means arm upwardly toward said one position after lowering of said draw hook and at least prior to full return of said draw hook to its lifted normal position, said drive means furtherincluding a resilient tension means connected between said second arm and a portion of said rail remote therefrom and responsive to shifting of said rail away from said second arm for pivoting said first arm positively against said draw hook upper side so as to carry out said positive pushing of said draw hook toward its lowered position.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)
  • Seats For Vehicles (AREA)
US00343888A 1972-03-28 1973-03-22 Positive dobby Expired - Lifetime US3851675A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH462772A CH549666A (de) 1972-03-28 1972-03-28 Gegenzug-schaftmaschine.

Publications (1)

Publication Number Publication Date
US3851675A true US3851675A (en) 1974-12-03

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Application Number Title Priority Date Filing Date
US00343888A Expired - Lifetime US3851675A (en) 1972-03-28 1973-03-22 Positive dobby

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US (1) US3851675A (ja)
JP (1) JPS5250312B2 (ja)
CH (1) CH549666A (ja)
CS (1) CS180589B2 (ja)
DE (1) DE2221842C3 (ja)
ES (1) ES412386A1 (ja)
FR (1) FR2178029B1 (ja)
GB (1) GB1394797A (ja)
IT (1) IT981677B (ja)
SU (1) SU617019A3 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4187886A (en) * 1977-10-14 1980-02-12 S.A. Des Etablissements Staubli Dobby for the formation of the shed on looms
US4465108A (en) * 1981-08-06 1984-08-14 Fimtessile Fabbrica Italiana Macchinario Tessile S.P.A. Play taking-up means in loom dobby control units
US20170247819A1 (en) * 2016-02-25 2017-08-31 Kabushiki Kaisha Toyota Jidoshokki Warp shedding apparatus of loom

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4820619U (ja) * 1971-07-20 1973-03-08
JPS55139112U (ja) * 1979-03-24 1980-10-03
EP0080000A1 (de) * 1981-11-25 1983-06-02 GebràœDer Sulzer Aktiengesellschaft Kupplungsanordnung zum Steuern der Schäfte einer Webmaschine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1546728A (en) * 1925-04-15 1925-07-21 Gregson James Attachment for looms
DE959899C (de) * 1951-12-13 1957-03-14 Erich Grosse Doppelhub-Offenfach-Gegenzug-Schaftmaschine
GB862666A (en) * 1957-04-05 1961-03-15 Robert Staubli Positive double lift dobby motion
GB886310A (en) * 1959-04-01 1962-01-03 Saurer Ag Adolph A double-lift open-shed dobby
US3057379A (en) * 1957-07-27 1962-10-09 Staubli Geb & Co Dobbies
CH439154A (de) * 1964-08-05 1967-06-30 Grosse Webereimaschinen Gmbh Gegenzug-Schaftmaschine
US3665973A (en) * 1969-05-05 1972-05-30 Staeubli Ag Dobby

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH510149A (de) * 1969-05-06 1971-07-15 Staeubli Ag Schaftmaschine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1546728A (en) * 1925-04-15 1925-07-21 Gregson James Attachment for looms
DE959899C (de) * 1951-12-13 1957-03-14 Erich Grosse Doppelhub-Offenfach-Gegenzug-Schaftmaschine
GB862666A (en) * 1957-04-05 1961-03-15 Robert Staubli Positive double lift dobby motion
US3057379A (en) * 1957-07-27 1962-10-09 Staubli Geb & Co Dobbies
GB886310A (en) * 1959-04-01 1962-01-03 Saurer Ag Adolph A double-lift open-shed dobby
CH439154A (de) * 1964-08-05 1967-06-30 Grosse Webereimaschinen Gmbh Gegenzug-Schaftmaschine
US3665973A (en) * 1969-05-05 1972-05-30 Staeubli Ag Dobby

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4187886A (en) * 1977-10-14 1980-02-12 S.A. Des Etablissements Staubli Dobby for the formation of the shed on looms
US4465108A (en) * 1981-08-06 1984-08-14 Fimtessile Fabbrica Italiana Macchinario Tessile S.P.A. Play taking-up means in loom dobby control units
US20170247819A1 (en) * 2016-02-25 2017-08-31 Kabushiki Kaisha Toyota Jidoshokki Warp shedding apparatus of loom
US10287713B2 (en) * 2016-02-25 2019-05-14 Kabushiki Kaisha Toyota Jidoshokki Warp shedding apparatus of loom

Also Published As

Publication number Publication date
JPS5250312B2 (ja) 1977-12-23
DE2221842A1 (de) 1973-10-11
DE2221842B2 (de) 1979-09-06
FR2178029A1 (ja) 1973-11-09
CS180589B2 (en) 1978-01-31
CH549666A (de) 1974-05-31
DE2221842C3 (de) 1980-05-14
GB1394797A (en) 1975-05-21
FR2178029B1 (ja) 1976-05-07
SU617019A3 (ru) 1978-07-25
JPS4913468A (ja) 1974-02-05
ES412386A1 (es) 1976-01-16
IT981677B (it) 1974-10-10

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