US3407848A - Device for rotating the pattern cylinder of double-lift dobbies independently of itsnormal drive - Google Patents

Device for rotating the pattern cylinder of double-lift dobbies independently of itsnormal drive Download PDF

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Publication number
US3407848A
US3407848A US610978A US61097867A US3407848A US 3407848 A US3407848 A US 3407848A US 610978 A US610978 A US 610978A US 61097867 A US61097867 A US 61097867A US 3407848 A US3407848 A US 3407848A
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Prior art keywords
lever
dobby
loom
cylinder
wheel
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Expired - Lifetime
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US610978A
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English (en)
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Fumat Joseph
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MECANIQUES VERDOL Ste
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MECANIQUES VERDOL Ste
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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
    • D03C1/146—Independent drive motor
    • 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
    • D03C2700/0177—Devices for levelling the heald frames; Coupling and uncoupling the drive for the heald frames; Devices for holding the shed open

Definitions

  • the present invention relates to do bbies for looms and it more particularly concerns double-lift dobbies wherein selection is effected by means of feeler needles and of a perforated paper band, each card of which (i.e., each one of the successive zones of the band on which the feeler needles are lowered) corresponds to two successive picks of the loom, the heald shafts being actuated by two sets of hooks.
  • the device according to the present invention essentially comprises a single lever which, when it is actuated in a first direction starting from its position of rest, momentarily raises the feeler needles, momentarily disengages the positioning pawl of the paper carrying cylinder, rotates the latter backwards through an angle corresponding to one card, i.e., to two picks of the loom, then liberates 3,407,848 Patented Oct. 29, 1968
  • the said lever is actuated in the reverse or second direction starting from its position of rest, it only de-clutches the dobby from the loom in order to permit free rotation of the dobby in the forward direction.
  • the lever at the end of its stroke in the first or in the second direction the lever further actuates a switch which energizes an auxiliaiy motor adapted to drive the dobby respectively forwardly or backwardly.
  • the lever first clutches the auxiliary motor with the dobby and thereafter actuates a reversing switch which energizes the motor for rotation in the proper direction.
  • FIG. 1 is a fragmental perspective view diagrammatically illustrating the main components of a device according to the present invention together with those of the double-lift dobby with which this device cooperates.
  • FIG. 2 is an enlarged side view of the main portion of the device.
  • FIG. 3 is a general diagrammatical view illustrating some parts omitted in FIGS. 1 and 2.
  • this dobby is in itself of quite conventional construction. It comprises two sets of reciprocating hooks which are appropriately selected under the action of feeler needles and of a perforated paper pattern which is programmed as successive pattern cards.
  • This band is shown at 1 in FIG. 1. It is supported by a cylinder 2 formed of pegged wheels the teeth or pegs 3 of which engage rows of perforations provided along the edges of the band. These pegged wheels are carried by a shaft 4 on which is keyed an advancing wheel 5 intermittently actuated by a finger (not illustrated) carried by a continuously rotating arm.
  • this wheel 5 is retained in position by a positioning pawl formed of a gudgeon 6 supported by a lever 7 submitted to the action of a spring not shown, this gudgeon being momentarily disengaged fromthe wheel (i.e., raised in FIG. 3) by an appropriate cam gearing (not illustrated) during actuation of the wheel.
  • the lever 7 is itself carried by a shaft 8 on which is mounted a pair of arms 9 connected with each other by a cross bar 10 adapted to raise and to lower a number of fingers 11, only one of which is shown, to which are individually attached the feeler needles 12.
  • Each finger 11 is radially secured to a ring 13 loosely supported by the abovementioned shaft 8, this ring carrying a second finger 14 which is appropriately connected with a pusher needle (not shown) corresponding to one of the hooks of the dobby.
  • a pusher needle (not shown) corresponding to one of the hooks of the dobby.
  • the fingers 11 and the feeler needles 12 are cyclically raised together with the positioning pawl or igudgeon 6 by the cross-bar 10 during the advancing step of the perforated paper band 1, i.e., while the advancing finger (not shown) co-acts with the advancing wheel 5.
  • the feeler needles are again lowered, to read the card and effect selection of the dobby hooks.
  • the feeler needles are disposed in two rows which respectively correspond to the upper hooks and to the lower hooks of the dobby which are thus selected simultaneously. Since these two sets of books operate alternatively, the selection is effected for two successive picks of the loom and each card of the paper band thus corresponds to two picks.
  • the operating speed of the selecting gearing of the dobby is therefore one half the speed of'the loom, which is of course a marked advantage.
  • the dobbies of the kind in question afford the inconvenience that when the operator has to proceed to an unweaving operation, the paper band should first be moved backward through an amount corresponding to two picks (or to one card), and that before normal operation is resumed, it must be advanced through the same amount.
  • a hand lever 15 which may be manually displaced in one or the other direction (upwardly or downwardly in FIG. 1) starting from a mean position or position of rest which corresponds to the normal combined operation of the loom and of the dobby.
  • This lever 15 is secured to a shaft 16 which also carries a cam supporting arm 17, a connecting lever 18 and a contact actuating nose 19.
  • the cam supporting arm 17 is integral with a flat enlarged head 17a of generally arcuate shape formed with a cam slot 17b (FIGS. 1 and 2).
  • This slot co-acts with a roller 20 carried by one arm of a bell-crank lever 21 mounted on a stud 22.
  • the other arm of this lever is connected by a link 23 with a toothed sector 24 carried by .a short shaft 25.
  • the toothed sector 24 meshes with a pinion 26 rotatably supported by a stud 27, this pinion 26 having a laterally protruding finger 28 adapted to actuate a displacing wheel 29 keyed on the cylinder carrying shaft 4.
  • the arrangement is such that at each revolution of the pinion 26, the finger 28 causes the displacing wheel 29 to rotate through an angle corresponding to one tooth.
  • the roller 20 When the hand lever 15 is at its position of rest, as illustrated in FIG. 1, the roller 20 is in the central zone of the cam groove 17b, in the portion thereof which is situated at the greatest radial distance from the axis of the shaft 16. For this position of the roller 20 the finger 28 is wholly disengaged from the displacing wheel 29 on the left-hand side of the plane which contains the axis of the wheel 29 and of the pinion 26 in FIG. 1. If now the hand lever 15 is raised, i.e., is swung clockwise (arrow AV in FIG. 1), the roller 20 remains in a portion of the cam slot 17b which is concentric to the shaft 16 and therefore the bell-crank lever 21 is not actuated.
  • the short shaft 25 on which the toothed sector 24 is mounted also carries :a cam 31 formed of an untoothed sector having a central hoss 31a which, when the shaft 25 is rotated, actuates a roller 32 supported by a lever 33 keyed on the above-mentioned shaft 8.
  • the lever 33 is thus rotated counterclockwise in FIGS. 1 and 2, together with the shaft 8 and the components which it carries.
  • the cross bar is thus momentarily raised and it in turn raises the feeler needles 12 while the positioning pawl 6 liberates the advancing Wheel 5.
  • the arrangement is such that this occurs exactly during actuation of the displacing wheel 29 by the finger 28 is order that the cylinder may be rotated freely and that the displacement of the perforated paper pattern 1 should not be hindered by the feeler needles.
  • the connecting lever 18 carried by the shaft 16 actuates a link 34 the other end of which is pivotally connected with a lever 35 pivoted on a stud 36.
  • the pivoted end of this lever is integral with a hollow triangular cam or frame 37 which co-acts with a finger 38 carried by a two-armed lever 39 pivoted at 40 (FIG. 3).
  • the other end of this lever 39 carries a roller 41 adapted to act on a circular plate 42 supported by a sleeve 43 which is slidably keyed on a shaft 44.
  • the latter carries a sprocket 45 connected by a chain 46 with another sprocket 47 mounted on an appropriate shaft 48 of the loom.
  • the sleeve 43 is formed with a single lateral tooth 49 which extends through about 180 and it is submitted to the action of a spring 50 disposed between the sprocket 45 and the circular plate 42, the said spring tending to bring the tooth 49 into mesh with a complementary tooth 51 provided at the end of the hub 53 of a bevel gear 54 which meshes with a corresponding bevel gear 55 keyed on the driving shaft 56 of the dobby.
  • the hub 53 is loose on the shaft 44, but is axially retained in position thereon. It further carries a spur gear 57.
  • a small auxiliary electric motor 58 associated with a speed reducing gearing 59.
  • a sleeve 61 formed at its ends with pinions 62 and 63 which may he selectively brought into mesh with the spur gear 57.
  • This sleeve 61 is axially displaced on the outlet shaft 60 by the forked end (not illustrated) of an extension 35a of the abovementioned lever 35.
  • the nose 19 As to the nose 19, at the position of rest of the hand lever 15, it is situated between two micro-switches which have been very diagrammatically illustrated at 64 and 65 in FIG. 3. These micro-switches control an electromagnetic reversing switch 66 inserted between the auxiliary motor 58 and the network 67.
  • the arrangement is such that when the hand lever 15 is actuated in one or the other direction, the nose 19 actuates one or the other of the micro-switches at the end of the stroke of the lever.
  • the finger 28 When the hand lever 15 is at its position of rest, as illustrated in FIGS. 1 and 3, the finger 28 is disengaged from the displacing wheel 29 and it does not therefore hinder the normal advance of the paper band.
  • the boss 31a is on the left-hand side of the roller 32 and the positioning pawl or gudgeon is therefore free to cooperate with the advancing wheel 5, the cross bar 10' raising normally the feeler needles 12 during each advance of the said wheel.
  • the finger 38 is situated at the apex of the cam or frame 37, the roller 41 is at the position illustrated in FIG. 3 and it does not therefore prevent the spring 50 from bringing into mesh the teeth 49 and 51.
  • the driving shaft 56 of the dobby is thus clutched with the loom for normal operation of the latter.
  • the extension 35a of the lever 35 is at its mean position for which the pinions 62 and 63 are situated on each side of the spur gear 57 which may thus rotate freely.
  • the nose 19 is spaced from both micro-switches 64 and 65 and therefore the reversing switch 66 is at the open position.
  • the dobby may thus freely operate normally in combination with the loom in the conventional manner.
  • the connecting arm 18 has caused the lever 35 and the triangular cam 37 to rotate counterclockwise. This rotation of the cam has moved the finger 38 towards the right and therefore the roller 41 towards the left. The teeth 49 and 51 have been disengaged from each other against the action of the spring 50 thus de-clutching the dobby from the loom. As to the rotation of the lever 35, it has caused the right-hand pinion 63 to come into mesh with the spur wheel '57.
  • the nose 19 actuates the micro-switch 65.
  • the latter acts in turn on the reversing switch 67 which is brought to such a position that the auxiliary motor 58 is energized for driving the dobby backwards at a reduced speed.
  • This energization of the motor 58 only occurs well after disengagement of the teeth 49 and 51, and after the paper band has been displaced backwards through one card.
  • the dobby now operates correctly with respect to the successive wefts of the fabric since the paper band has been previously displaced backwards as required.
  • the operator may thus freely remove the weft threads from the successive sheds during the slow rotation of the dobby. He may besides stop this rotation at will by merely raising very slightly the hand lever 15 Ge, through an amount just sufficient to open the microswitch 65).
  • the operator releases the hand lever 15.
  • the spring 50 then returns the triangular cam to its position of rest as illustrated in FIG. 3, together with the lever 15 itself. It is to be remarked that this return of the hand lever 15 to its position of rest could also be effected by separate spring means, as for instance by a spring urging the lever 39 to wards the left in FIG. 3.
  • the microswitch 65 opens, the auxiliary motor 58 stops, the pinion 63 disengages from the spur wheel 57 and the toothed sector 24 is returned to its initial position of FIG. 3, the finger 28 again displacing the paper band through one card, but this time in the forward direction, as required for proper operation of the dobby in combination with the loom.
  • the operator of the loom may rotate the dobby backwards or forwards, as desired, without having to take care of the necessary preliminary displacement of the paper band before unweaving and. before resuming normal loom operation.
  • a device to rotate said cylinder independently of said drive means comprising an actuating member having a position of rest and a first operative position; first means actuated by said actuating member to momentarily raise the feeler needles to an inoperative position and to disengage the positioning pawl, and thereafter to lower said feeler needles and to liberate said retaining pawl, while said actuating member is moved from its position of rest to its first operative position and when it is returned from its first operative position to its position of rest; second means actuated by said actuating member to displace said cylinder through an amount corresponding to said distance
  • an auxiliary motor to rotate said cylinder independently of said drive means; fourth means actuated by said actuating member to mechanically connect said auxiliary motor with said cylinder when said actuating member is moved from its position of rest to any of its first and second operative positions; fifth means actuated by said actuating member to cause rotation of said auxiliary motor when said member has reached any of its first and second operative positions; and sixth means actuated by said actuating member to cause said motor to rotate said cylinder in the backward direction when said actuating member reaches its first operative position and in the forward direction when it reaches its second operative position.
  • said auxiliary motor being a reversible electric motor; said fifth means being formed of electric contacts; and said sixth means being comprised of a reversing switch actuated by said 8 electric contacts to control rotation of said reversible motor.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US610978A 1966-02-24 1967-01-23 Device for rotating the pattern cylinder of double-lift dobbies independently of itsnormal drive Expired - Lifetime US3407848A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR46983A FR1483782A (fr) 1966-02-24 1966-02-24 Perfectionnements aux ratières à double lève

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US3407848A true US3407848A (en) 1968-10-29

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US (1) US3407848A (de)
CH (1) CH457311A (de)
DE (1) DE1710187B1 (de)
FR (1) FR1483782A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3680599A (en) * 1969-03-22 1972-08-01 Hindle Son & Co Ltd Looms for weaving
US3724510A (en) * 1970-05-29 1973-04-03 Staeubli Ag A dobby
US3875972A (en) * 1973-10-23 1975-04-08 Rockwell International Corp Pick finder connected to color selector
US3895653A (en) * 1973-07-21 1975-07-22 Yamada Dobby Co Ltd Card reverting and racing apparatus in a dobby machine
US4417604A (en) * 1980-08-18 1983-11-29 Staeubli Ltd. Method and dobby for synchronizing all heddle frames of a weaving machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS160389B1 (de) * 1972-11-02 1975-03-28

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE686573C (de) * 1937-03-23 1940-01-12 Carl Zangs Akt Ges Maschf Rueckdrehvorrichtung fuer Webstuehle
FR969951A (fr) * 1948-07-29 1950-12-28 Diederichs Atel Dispositif de recherche automatique de la duite pour métiers à tisser
US3095015A (en) * 1957-05-03 1963-06-25 Dewas Raymond Weaving looms
US3318341A (en) * 1965-07-28 1967-05-09 Nollet Georges Loom reversing means

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE667170C (de) * 1934-04-27 1938-11-05 Staeubli Geb & Co Schusssuchvorrichtung fuer Schaftmaschinen
DE1012269B (de) * 1954-09-21 1957-07-11 Rueti Ag Maschf Doppelhubschaftmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE686573C (de) * 1937-03-23 1940-01-12 Carl Zangs Akt Ges Maschf Rueckdrehvorrichtung fuer Webstuehle
FR969951A (fr) * 1948-07-29 1950-12-28 Diederichs Atel Dispositif de recherche automatique de la duite pour métiers à tisser
US3095015A (en) * 1957-05-03 1963-06-25 Dewas Raymond Weaving looms
US3318341A (en) * 1965-07-28 1967-05-09 Nollet Georges Loom reversing means

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3680599A (en) * 1969-03-22 1972-08-01 Hindle Son & Co Ltd Looms for weaving
US3724510A (en) * 1970-05-29 1973-04-03 Staeubli Ag A dobby
US3895653A (en) * 1973-07-21 1975-07-22 Yamada Dobby Co Ltd Card reverting and racing apparatus in a dobby machine
US3875972A (en) * 1973-10-23 1975-04-08 Rockwell International Corp Pick finder connected to color selector
US4417604A (en) * 1980-08-18 1983-11-29 Staeubli Ltd. Method and dobby for synchronizing all heddle frames of a weaving machine

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Publication number Publication date
FR1483782A (fr) 1967-06-09
DE1710187B1 (de) 1971-10-07
CH457311A (fr) 1968-05-31

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