US3390705A - Dobby - Google Patents

Dobby Download PDF

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Publication number
US3390705A
US3390705A US523358A US52335866A US3390705A US 3390705 A US3390705 A US 3390705A US 523358 A US523358 A US 523358A US 52335866 A US52335866 A US 52335866A US 3390705 A US3390705 A US 3390705A
Authority
US
United States
Prior art keywords
lever
draw
auxiliary
hooks
hook
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
US523358A
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English (en)
Inventor
Oberholzer August
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.)
Ruti Machinery Works Ltd
Maschinenfabrik Rueti AG
Original Assignee
Maschinenfabrik Rueti AG
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 Maschinenfabrik Rueti AG filed Critical Maschinenfabrik Rueti AG
Application granted granted Critical
Publication of US3390705A publication Critical patent/US3390705A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D03C1/22—Needles; Needle boxes; Needle boards

Definitions

  • Each draw hook has a projecting portion extending therefrom and each lever has its pivoting axis arranged so that in one of its pivoted positions the lever engages the projecting portion of the associated draw hook to position the hook in its non-engaged position and in the other pivoted position the lever moves away from the projecting portion, thereby determining the engaged position of the draw book.
  • one of the ends of the lever travels in engagement along its associated draw hook during movement of the draw hook and the projecting position of each hook is positioned to allow the lever associated therewith to move immediately upon initiation of the movement of the draw hook when drawn by the draw knife.
  • the present invention relates to a dobby for effecting the programmed movement of the heald shafts on a weaving loom or machine; said dobby having means for sensing a programme carrier and for actuating auxiliary hooks; each auxiliary hook being associated with a draw hook and, depending on actuation or non-actuation, operating to determine a first or a second position of the draw hook associated therewith relatively to a draw knife.
  • the auxiliary hooks moved by the feeler needles act, when they are actuated by auxiliary knives, on angle levers carrying support needles by means of which the draw hooks are raised or lowered.
  • the auxiliary hooks act directly on support needles and displace the lower ends of the needles into or out of the path of movement of upwardly and downwardly moving riser knives.
  • the draw hooks bear on the support needles. In both cases, the draw hooks are actuated by the support needles, as the needles are moved perpendicularly with respect to the longitudinal axis of the draw hooks.
  • the support needles are, in their axial direction, loose machine parts which are disposed between the auxiliary hooks and the draw hooks. At high speeds, this condition, i.e., loose arrangement, often causes disturbances in the operation of the weaving machine.
  • the dobby according to the invention obviates these causes of breakdown. Furthermore, it reduces the number of transmission elements between the means sensing the programme carrier and the draw hooks and thus makes the operation of the arrangement more reliable.
  • each auxiliary hook is connected with a lever so that, when the auxiliary hook is actuated, it pivots the lever about its pivoting axis;
  • pivoting axis being so arranged that one end of the lever travels along in engagement with the draw hook with which it is associated and, in one of the pivoting positions of the lever, it determines the first (or non-engaged) position of the draw hook whereas, in the other pivoting position, it determines the second .(or engaged) position thereof.
  • FIGURE 1 shows an example of a dobby having an arrangement according to the invention
  • FIGURE 2 shows a graphic illustration explaining the mode of operation of the arrangement of the dobby shown.
  • a punched card 12, forming a programme carrier is guided over a cylinder 11.
  • the presence or absence of a perforation in the card 12 determines the ⁇ positions of the heald shafts (not shown).
  • the figure shows only a small portion of the width of the punched card 12.
  • the card 12 is sensed by feeler needles 13 and 14. Of the feeler needles arranged in rows, only the foremost feeler needle of each row is shown.
  • the needles 13 sense the even number picks and the needles 14 the uneven picks.
  • Connected with each of the feeler needles 13 and 14 is one of the auxiliary hooks 15 or 16.
  • auxiliary knives 17 cO-operate with the auxiliary hooks.
  • the feeler needles 13 and 14 are adapted to be raised and lowered by means of the lifting rods 18 or 19. The knives 17 move either in the direction of the arrow A or in the direction opposite thereto.
  • hooks 28, 29 have the projecting portions 32 or 33, respectively.
  • the draw hooks 28 and 29 are secured on the rocking lever 34.
  • Lever 34 is mounted at the end of one of the arms 35 of a shaft lever rotatable about the pivot 36 which is-secured to the machine frame.
  • the other arm 37 of the shaft lever is connected with a coupling to a heald shaft (not shown).
  • the individual rows of perforations in the punched card 12 indicated by the horizontal straight lines are sensed by the feeler needles.
  • the rods 18 and 19 descend alternatingly, so that the needles 13 and 14- also descend. If a needle impinges in a perforation, it descends into the interior of the cylinder 11, otherwise it impinges against the material of the punch card and bears thereon.
  • the auxiliary hooks 15 secured to the needles 13 penetrating into the perforations in the punched card 12 descend until they bear on the knives 17, so that when the knives 17 move towards the left the auxiliary hooks 15 are carried with them.
  • needles which bear on the card material do not allow the auxiliary hooks connected with them to descend to such an extent that they are engaged by the auxiliary knives.
  • FIGURE 2 shows the temporal development of the movements of the various parts.
  • the time (as a phase angle) extending over two working cycles is plotted as the abscissa and the movements of the parts in respect to time are plotted as the ordinates. No exact scale accuracy has been observed.
  • the curves illustrating the movements of the individual parts have been provided with the reference numerals given to the parts shown in FIGURE 1.
  • rollers are secured at the end 40 of the lever 20 and at the end 41 of the lever 22. These ensure movement of the lever end 40 or of the lever end 41 along the draw hooks 28 or 29, respectively, with extremely little friction.
  • the roller may also be omitted, in which case the lever ends 40 and 31 slide along their associated draw books 28 or 29, respectively.
  • the travel curves for the ends 40 and 41 formed by the lifter 28, 29 and projecting portions 32, 33 are continuously curved.
  • the projecting portions 32 or 33 respectively are not provided.
  • the levers (inclusive of their two end positions) should remain at an acute angle relatively to the axis of the draw hook associated with them.
  • An advantageous position is for example provided when the lever 20 bearing against the stop 25 is rotated clockwise relatively to the position shown in FIGURE 1 to such an extent that its axis forms an angle of 60 and with that of the hook 28.
  • the torque exerted by the weight of the draw hook 28 on the lever 20 is taken up by the spring 24.
  • the auxiliary hooks 15 and 16 are adapted to be pushed, from the side of the stops 25 and 27 and by means of their bent-over ends, over the retaining projections provided on the levers 20 and 22. If, then, the stops 25 and 27 (as shown in FIGURE 1) are designed as walls, then the stops prevent the moving-out towards the right of the bent-over parts, surrounding the projections, of the auxiliary hooks 15, 16.
  • a dobby for effecting a programmed movement of heald shafts on a loom which comprises a program carrier, a plurality of auxiliary hooks, each being connected to a pivotable two-armed lever, said lever having a pivoting axis and being biased into an inoperative position against a stop by a pretensioning means, and upon actuation by an auxiliary hook being moved against the force of the pretensioning means to an operative position, means for sensing the program carrier and for actuating the auxiliary hooks in a programmed manner to pivot at least one of the pivotable levers about its pivoting axis, each of said pivotable levers being associated with a draw hook and, depending upon actuation or non-actuation by an auxiliary hook, being pivoted to the operative or inoperative position thereby determining an engaged or a non engaged position of the draw hook relative to a draw knife, each draw hook having a projecting portion extending therefrom, and the pivoting axis of each lever being arranged so that in one of its pivoted positions
  • each of the auxiliary hooks are adapted to be moved into and out of a retaining arrangement on a lever from one side of the stop and the levers in their inoperative positions each abut against the stop, said stop constituting a wall whereby in the abutting position disengagement of the auxiliary hooks from the retaining arrangement is prevented by said wall.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US523358A 1965-02-19 1966-01-27 Dobby Expired - Lifetime US3390705A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH234565A CH421010A (de) 1965-02-19 1965-02-19 Schaftmaschine

Publications (1)

Publication Number Publication Date
US3390705A true US3390705A (en) 1968-07-02

Family

ID=4231622

Family Applications (1)

Application Number Title Priority Date Filing Date
US523358A Expired - Lifetime US3390705A (en) 1965-02-19 1966-01-27 Dobby

Country Status (5)

Country Link
US (1) US3390705A (fr)
BE (1) BE676725A (fr)
CH (1) CH421010A (fr)
FR (1) FR1456235A (fr)
GB (1) GB1084626A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771571A (en) * 1971-08-23 1973-11-13 S Xaus Synchronized reading devices for looms
US4350401A (en) * 1980-02-11 1982-09-21 Kortech Engineering, Inc. Detachable electrical connector assembly having improved means for aligning connector parts
CN101768806B (zh) * 2009-12-22 2011-04-27 常熟市常纺纺织机械有限公司 积极式多臂机的梭口双开口机构

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1672434A (en) * 1926-05-28 1928-06-05 Staubli Geb & Co Shed-forming machine with paper pattern cards
CH221907A (de) * 1941-11-25 1942-06-30 Hermann Brehm Hans Geschlossenfach-Einhubschaftmaschine.
US2635644A (en) * 1947-09-16 1953-04-21 Staubli Geb & Co Closed shed dobby
US2705505A (en) * 1953-01-26 1955-04-05 Staubli Geb & Co Weaving looms, particularly dobbies
US2976891A (en) * 1957-08-22 1961-03-28 Staubli Geb & Co Dobbies
GB942474A (en) * 1959-07-22 1963-11-20 Rueti Ag Maschf Improved double lift dobby

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1672434A (en) * 1926-05-28 1928-06-05 Staubli Geb & Co Shed-forming machine with paper pattern cards
CH221907A (de) * 1941-11-25 1942-06-30 Hermann Brehm Hans Geschlossenfach-Einhubschaftmaschine.
US2635644A (en) * 1947-09-16 1953-04-21 Staubli Geb & Co Closed shed dobby
US2705505A (en) * 1953-01-26 1955-04-05 Staubli Geb & Co Weaving looms, particularly dobbies
US2976891A (en) * 1957-08-22 1961-03-28 Staubli Geb & Co Dobbies
GB942474A (en) * 1959-07-22 1963-11-20 Rueti Ag Maschf Improved double lift dobby

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771571A (en) * 1971-08-23 1973-11-13 S Xaus Synchronized reading devices for looms
US4350401A (en) * 1980-02-11 1982-09-21 Kortech Engineering, Inc. Detachable electrical connector assembly having improved means for aligning connector parts
CN101768806B (zh) * 2009-12-22 2011-04-27 常熟市常纺纺织机械有限公司 积极式多臂机的梭口双开口机构

Also Published As

Publication number Publication date
CH421010A (de) 1966-09-15
BE676725A (fr) 1966-07-18
FR1456235A (fr) 1966-10-21
GB1084626A (en) 1967-09-27

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