US3603351A - Dobby for looms - Google Patents

Dobby for looms Download PDF

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Publication number
US3603351A
US3603351A US804454A US3603351DA US3603351A US 3603351 A US3603351 A US 3603351A US 804454 A US804454 A US 804454A US 3603351D A US3603351D A US 3603351DA US 3603351 A US3603351 A US 3603351A
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United States
Prior art keywords
cam
follower
housing
heddles
positive displacement
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
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US804454A
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English (en)
Inventor
Giovanni Piazzolla
Carlo Villa
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Individual
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Individual
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C5/00—Cam or other direct-acting shedding mechanisms, i.e. operating heald frames without intervening power-supplying devices
    • D03C5/02—Cam or other direct-acting shedding mechanisms, i.e. operating heald frames without intervening power-supplying devices operated by rotating cams
    • 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

  • This invention relates to looms, in particular dobby looms.
  • Small looms for the production of ribbon fabrics comprising small units equipped with a few wefting devices arranged side by side for the parallel production of ribbon fabrics are known to those skilled in the art.
  • Small looms are preferred because they can be operated at high speeds, for example, 1,000 to L500 beats per minute. It has not been possible to increase the operating speed of small looms beyond 1,500 beats per minute. This is attributable to the fact that the dobby heddles are moved in two directions by means of grooved cylinder cams cooperating with rollers which impart motion through articulated levers.
  • Another object of the invention is to reduce the frequency of replacement of certain movable parts in a dobby loom.
  • Another object of the invention is to reduce the surface wear of cams in dobby looms and thereby increase their useful life.
  • Another object of the invention is to reduce the noise now present in a dobby loom.
  • Another object is to simplify the operations required to modify or change a fabric pattern produced by a dobby loom.
  • Another object is to provide a motion transmission member which can be adjusted to compensate for wear or for varying initial positions of heddles.
  • the invention resides in the provision of a loom, particularly a dobby loom, which comprises a plurality of movable heddles, guide means for restricting the heddles to reciprocatory motion, and drive means for reciprocating the heddles.
  • the drive means comprises a biasing means for yieldably urging the heddles in one direction, and positive displacement means for intermittently moving the heddles in the opposite direction against the resistance of the biasing means.
  • FIG. 1 is a schematic sectional view of a small loom with certain parts shown in elevation into which an embodiment of the invention has been incorporated;
  • FIG. 2 is an enlarged sectional view as seen along line II-II of FIG. ll.
  • FIG. 1 shows a small loom for the fabrication of ribbon fabrics comprising a frame 1, equipped with a pair of weaving devices 2 and a weft beating reed 3. A pack of heddles 4 behind reed 3 moves warp 5.
  • the heddles 4 are supported and guided by motion-transmitting rods, two of which are shown at 6 and 6'.
  • the lower ends of the rods are connected to biasing means here shown as including pairs of helical expansion springs 7and 8.
  • the lower ends of the springs are anchored in a retainer 34 which is ad justable in either of the directions indicated by the doubleheaded arrow in FIG. 1 to thereby select the initial spring bias.
  • Helical expansion springs 7'and 8 are so located that they provide at last a component of the bias axially directed as the correspondingrods 6 or 6'.
  • Rods 6 and 6 have seats 9 fitted about their midportion, onto which lightweight follower rollers 10 of small diameter are fitted;
  • a set of bent-levers 12, one for each rod, is rotatable around. a pivot 11.
  • Each lever 12 has an arm 13 at the end of which a follower roller 14 contacts the external profile of a cam 15. the contact pressure being a function of the bias provided by springs 7 and 8.
  • the lengthof arms 16 and 16 is dependent upon the distance of rods 6 and 6' from the pivot 11; thus arm 16 which contacts roller 10 on rod 6 is shorter than arm 16' which extends to rod 6.
  • a constant contact pressure between rollers 10 and the ends of arms 16 and 16' is maintained by the bias of springs 7 and 8. As shown in FIG.
  • Cams l5, levers l2 and those portions of the rods which support rollers 10 are enclosed by an oil-bath housing 17.
  • earns 15 are assembled on an internal sleeve 21 which is mounted on shaft 20.
  • Sleeve 21 has a flange 22 which permits tightening of the stack of cams by means of screws 23 against a second flange 24 which is fixed to the shaft 20.
  • Sleeve 21 is secured to shaft 20 at one end by means of one or more keys 25.
  • Shaft 20 is supported at its ends by means of supports 26 and 27 with interposed ball or roller bearings 26' and 27 respectively.
  • Support 26 is secured to the lateral sides 33 of housing 17 by means of screws 32.
  • the lubricant is drained from housing 17 and screws 32 are removed from the sides 33 of the housing.
  • shaft 20 with its stack of cams can be withdrawn.
  • Another shaft with cams of a different external profile can then be rapidly installed, and a new fabric pattern can be produced.
  • each rod 6 or 6' can be biased by a single spring. It is also possible to employ other types of wefting devices and/or other fastening means for the cams. It is further possible to use other types of biasing means in addition to, or as a substitute for springs 7 and 8.
  • a loom particularly a dobby loom, in combination, a plurality of movable elongated heddles; guide means for guiding said heddles for reciprocating movement in longitudinal direction and comprising a housing and a plurality of motiontransmitting rods respectively axially aligned with and connected to said heddles and being reciprocally guided in said housing; and drive means cooperating with said motion-transmitting rods for reciprocating the latter and the heddles connected thereto, said drive means comprising biassing means for yieldably urging said rods in one direction and positive displacement means comprising follower means mounted on said rods, rotary cam means and means for transmitting motion from said cam means to said follower means for intermittently moving said follower means in the opposite direction against the resistance of said biassing means.
  • cam means comprises a plurality of relatively discrete cams.
  • said positive displacement means further comprises a rotary support for said cam means and means for separably connecting said cam means to said support.
  • said means for transmitting motion from said cam means to said follower means comprises lever means pivotable about a single predetermined axis, said lever means having first arm means engaging said follower means, and second arm means provided with second follower means tracking said cam means.
  • biasing means comprises a plurality of spring means.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Treatment Of Fiber Materials (AREA)
US804454A 1968-03-06 1969-03-05 Dobby for looms Expired - Lifetime US3603351A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1359368 1968-03-06

Publications (1)

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US3603351A true US3603351A (en) 1971-09-07

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US804454A Expired - Lifetime US3603351A (en) 1968-03-06 1969-03-05 Dobby for looms

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US (1) US3603351A (enrdf_load_stackoverflow)
CH (1) CH484305A (enrdf_load_stackoverflow)
DE (1) DE1903440A1 (enrdf_load_stackoverflow)
FR (1) FR2003302A1 (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3695304A (en) * 1970-05-18 1972-10-03 Carlo Menegatto Dobby mechanism for looms
US3752194A (en) * 1972-02-29 1973-08-14 Bonas Machine Co Loom shedding mechanism
US3763897A (en) * 1971-03-02 1973-10-09 Bonas Machine Co Chain type loom shedding mechanism
US3796235A (en) * 1971-04-23 1974-03-12 J Muller Harness arrangement for a loom
US3949788A (en) * 1973-11-22 1976-04-13 Jakob Muller Forschungs-Und Finanz Ag Web weaving machine with several heald shafts
US4120326A (en) * 1975-10-03 1978-10-17 Vyzkumny Ustav Bavlnarsky Shed forming device for looms
US5479963A (en) * 1994-11-30 1996-01-02 Cheng; Chuan-Tien Loom heald hook lifter
FR2868088A1 (fr) * 2004-03-29 2005-09-30 Staubli Faverges Sca Mecanisme d'armure a cames, metier a tisser equipe d'une telle mecanique et procede d'assemblage d'une telle mecanique
US20060231274A1 (en) * 2005-04-13 2006-10-19 Bram Vanderjeugt Device for modulating a first rotational motion of an input shaft to a second, different from the first, rotational motion of an output shaft in textile machines
EP1908862A1 (de) * 2006-10-06 2008-04-09 Groz-Beckert KG Schaftgetriebe für eine Webmaschine
CN103173907A (zh) * 2011-12-21 2013-06-26 株式会社丰田自动织机 用于织机中的电动开口设备的自动润滑剂供应装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209958C2 (de) * 1982-03-18 1985-01-31 OMM Officine Meccanotessili Monza S.p.A., Monza Elektromechanische Steuervorrichtung zum Steuern von Bewegungsabläufen in einer Textilmaschine
FR2911348B1 (fr) * 2007-01-12 2009-03-06 Staubli Faverges Sca Mecanique a cames pour la formation de la foule sur un metier a tisser, metier a tisser et procede de decouplage des cames par rapport aux galets d'une mecaniques a cames

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US734834A (en) * 1903-03-02 1903-07-28 Draper Co Shedding mechanism for looms.
US2263678A (en) * 1939-08-12 1941-11-25 Wonder Weave Inc Shedding mechanism
GB639771A (en) * 1940-12-03 1950-07-05 Jaime Picanol Improvements in shedding mechanism for looms
US2552418A (en) * 1945-12-22 1951-05-08 Talon Inc Shedding mechanism for looms
US2980145A (en) * 1959-07-03 1961-04-18 Crompton & Knowles Corp Selective shedding mechanism for looms
CA690880A (en) * 1964-07-21 M.J. Ancet Victor Shuttleless weaving looms
US3173452A (en) * 1961-03-22 1965-03-16 Alsacienne Constr Meca Weaving process

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA690880A (en) * 1964-07-21 M.J. Ancet Victor Shuttleless weaving looms
US734834A (en) * 1903-03-02 1903-07-28 Draper Co Shedding mechanism for looms.
US2263678A (en) * 1939-08-12 1941-11-25 Wonder Weave Inc Shedding mechanism
GB639771A (en) * 1940-12-03 1950-07-05 Jaime Picanol Improvements in shedding mechanism for looms
US2552418A (en) * 1945-12-22 1951-05-08 Talon Inc Shedding mechanism for looms
US2980145A (en) * 1959-07-03 1961-04-18 Crompton & Knowles Corp Selective shedding mechanism for looms
US3173452A (en) * 1961-03-22 1965-03-16 Alsacienne Constr Meca Weaving process

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3695304A (en) * 1970-05-18 1972-10-03 Carlo Menegatto Dobby mechanism for looms
US3763897A (en) * 1971-03-02 1973-10-09 Bonas Machine Co Chain type loom shedding mechanism
US3796235A (en) * 1971-04-23 1974-03-12 J Muller Harness arrangement for a loom
US3752194A (en) * 1972-02-29 1973-08-14 Bonas Machine Co Loom shedding mechanism
US3949788A (en) * 1973-11-22 1976-04-13 Jakob Muller Forschungs-Und Finanz Ag Web weaving machine with several heald shafts
US4120326A (en) * 1975-10-03 1978-10-17 Vyzkumny Ustav Bavlnarsky Shed forming device for looms
US5479963A (en) * 1994-11-30 1996-01-02 Cheng; Chuan-Tien Loom heald hook lifter
JP2007530816A (ja) * 2004-03-29 2007-11-01 シュトイブリー・ファベルゲ カム織機構、その機構を取付けた織機と前記機構を組立てる方法
WO2005098108A1 (fr) * 2004-03-29 2005-10-20 Staubli Faverges Mecanique d'armure a cames, metier a tisser equipe d'une telle mecanique et procede d'assemblage d'une telle mecanique
FR2868088A1 (fr) * 2004-03-29 2005-09-30 Staubli Faverges Sca Mecanisme d'armure a cames, metier a tisser equipe d'une telle mecanique et procede d'assemblage d'une telle mecanique
CN1934301B (zh) * 2004-03-29 2010-06-09 施托布利法韦日公司 凸轮编织机构、安装有该机构的织机、组装所述机构的方法
US20060231274A1 (en) * 2005-04-13 2006-10-19 Bram Vanderjeugt Device for modulating a first rotational motion of an input shaft to a second, different from the first, rotational motion of an output shaft in textile machines
US7506668B2 (en) * 2005-04-13 2009-03-24 N.V. Michel Van De Wiele Device for modulating a first rotational motion of an input shaft to a second, different from the first, rotational motion of an output shaft in textile machines
EP1908862A1 (de) * 2006-10-06 2008-04-09 Groz-Beckert KG Schaftgetriebe für eine Webmaschine
US20080083472A1 (en) * 2006-10-06 2008-04-10 Groz-Beckert Kg Shaft transmission for a weaving machine
JP2008095271A (ja) * 2006-10-06 2008-04-24 Groz-Beckert Kg 織機用シャフト伝動装置
US7594522B2 (en) * 2006-10-06 2009-09-29 Groz-Beckert Kg Shaft transmission for a weaving machine
CN101161888B (zh) * 2006-10-06 2011-09-28 格罗兹—贝克特公司 用于织机的轴传动装置
CN103173907A (zh) * 2011-12-21 2013-06-26 株式会社丰田自动织机 用于织机中的电动开口设备的自动润滑剂供应装置
CN103173907B (zh) * 2011-12-21 2014-04-09 株式会社丰田自动织机 用于织机中的电动开口设备的自动润滑剂供应装置

Also Published As

Publication number Publication date
DE1903440B2 (enrdf_load_stackoverflow) 1974-10-10
CH484305A (it) 1970-01-15
FR2003302A1 (enrdf_load_stackoverflow) 1969-11-07
DE1903440C3 (enrdf_load_stackoverflow) 1975-05-28
DE1903440A1 (de) 1969-10-02

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