US3086378A - Control and braking device for pincarrying drums of circular knitting machines and the like - Google Patents

Control and braking device for pincarrying drums of circular knitting machines and the like Download PDF

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Publication number
US3086378A
US3086378A US23795A US2379560A US3086378A US 3086378 A US3086378 A US 3086378A US 23795 A US23795 A US 23795A US 2379560 A US2379560 A US 2379560A US 3086378 A US3086378 A US 3086378A
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United States
Prior art keywords
pin
ratchet wheel
carrying drum
drum
lever
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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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US23795A
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English (en)
Inventor
Azzolari Guido
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FN Herstal SA
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FN Herstal SA
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
    • D04B15/665—Driving-gear for programme or pattern devices
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
    • D04B15/68—Devices for determining or controlling patterns ; Programme-control arrangements characterised by the knitting instruments used
    • D04B15/74—Pattern drums
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/12—Freewheels or freewheel clutches with hinged pawl co-operating with teeth, cogs, or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H29/00—Gearings for conveying rotary motion with intermittently-driving members, e.g. with freewheel action
    • F16H29/02—Gearings for conveying rotary motion with intermittently-driving members, e.g. with freewheel action between one of the shafts and an oscillating or reciprocating intermediate member, not rotating with either of the shafts

Definitions

  • the invention has essentially for its object combined means adapted to ensure the duly controlled step by step driving and the permanent braking of said pincarrying drums in order to absorb systematically all effects of inertia.
  • the control or driving device forming the subject of the invention enables said pin-carrying drums to be indexed at will, according to the characteristics of the knitting work to be carried out.
  • each pincarrying drum is adapted to cause selective operation of the needles, which is essential, for example in work carried out with yarns of diflerent colors.
  • each pincarrying drum is fast with a ratchet wheel which must be able to carry out predetermined angular movements iol lowed by temporary stops, for the purpose, for example, of permitting the needles to knit a plurality of yarns of different colors or to carry out special work when use is made of yarns of a single color.
  • a first object of the invention is to provide a mechanism adapted to control, rigorously and quasi-mathematically, the movements and the stoppages, respectively, of the ratchet wheel and thus also of the pin-carrying drum with which it is fast. It is important to secure the pin-carrying drum against the harmful inertia effects resulting from the periodic setting in motion of the mass which the movable assembly represents.
  • a second object of the invention is to provide a rational braking device working in correlation with the control or driving mechanism.
  • FIGURE 1 is a perspective view of a circular knitting machine provided with a control and braking device of the present invention.
  • FIGURE 2 is an enlarged perspective view of aportion of the knitting machine shown in FIG.1.
  • FIGURE 3. shows diagrammatically and partly in section the head of said circular knitting machine;
  • FIGURES 4, 5, 6 and 7 showthecontrol or advance mechanism of the pin-carrying drum in four characteristic positions;
  • FIGURES 8 and 9 show two characteristic positions of the part inscribed in the circle B shown in FIGURES 4 and 5;
  • FIGURE l represents a characteristic position of the part inscribed in the circle B shown in FIGURE 6;
  • FIGURE 11 is asection on the line XI-XI of FIG- URE ice
  • FIGURE 12 shows, in radial section, the essential elements of the braking device of the pin-carrying drum.
  • control and braking device occupies, in the head of the circular knitting machine, the positions indicated at A in FIGURE 3. The location of this device is clearly indicated in FIGS. 1 and 2.
  • This device associated with each pin-carrying drum 1, is formed substantially by the following mechanical combination: a ratchet wheel 2, one tooth 3 of which has a length greater than that of the other teeth, is fixed to the bottom face of the drum 1; opposite the ratchet wheel there is disposed horizontally on the machine the driving mechanism proper; the latter is formed by a pawl 4 the axis of oscillation 5 of which is supported at the end of a lever 6 able to oscillate about a fixed axis 7 disposed towards its other end.
  • the pawl 4 has two shoulders 8, 9 serving to limit its angular movements, the first by coming into contact with the fixed stop 10 formed by the corresponding part of the oscillating lever 6 and the other by coming into contact with a movable stop formed by a finger 11 fitted with slight friction in a blind passage 12 provided in the thickness and longitudinally of the oscillating lever, and in which there is also housed a return spring 13 acting, on the one hand, on the bottom of the blind passage and, on the other hand, on the rear face of said finger 11.
  • the oscillating lever 6 Towards the bottom, the oscillating lever 6 has a wide protuberance 14 in which there is formed a recess v15. In the latter there is engaged one of the ends of a rocking lever 16 which is able to oscillate about the pin 17.
  • the upper end of the rocking lever 16 is permanently urged by a finger 18 likewise fitted with slight friction in a longitudinal blind passage 19 hollowed out of the thickness of the oscillating lever 6 and in which there is also housed a return spring 20- bearing, on the one hand, against the bottom of the blind passage and, on the other hand, against the rear face of the finger 18.
  • the lower arm of the rocking lever 16 has two shoulders or steps 21, 22.
  • the ratchet wheel 2 By means of this mechanism, it is possible to cause the ratchet wheel 2 to be able to move angularly step by step; either in order to drive the pin-carrying drum 1 continuously step by step according to a given program, or in order to bring it automatically to a stop at a duly predetermined instant, or again in order to bring it to a stop almost instantaneouslyat any moment desired.
  • the cam 24 is, therefore, continuously turning in the direction of the arrow F under the action of a suitable mechanism '(not shown), while the annular member 2 5 is moved in the direction of the arrow F in a sequence or program related to the operation of the knitting machine.
  • the tip of the pawl 4 is engaged between two teeth of the ratchet wheel 2.
  • the hump or lobe of the cam 24 comes into contact with the stud 23 (FIGURES 5, 8 and 9)
  • the latter is pushed away upwardly, forcing the lever 6 to rotate about its axis 7.
  • the pawl 4 rotates about its axis 5 while remaining engaged by its tip in a gap in the teeth of the ratchet wheel.
  • the pawl 4 shifts the ratchet wheel 2 by one step and, consequently,
  • the arrangement is such that, in this position, the amplitude of the return movement of the tip of the pawl 4 is equal to one and a half steps or spaces of the toothing of the ratchet wheel 2.
  • the result is that, without any other intervention, the ratchet wheel can be shifted indefinitely step by step, that is to say, tooth by tooth.
  • FIGURE 12 In order to secure the pin-carrying drum against the effects of inertia, use is made of a braking device, the essential elements of which are shown diagrammatically in FIGURE 12.
  • the ratchet wheel 2 is fixed to the bottom face of the drum 1 by means of a screw passing through the hole 29 in the ratchet wheel and engaging in the threaded blind hole 30 in drum 1.
  • the latter has a cylindrical axial bore 31 and comprises around the latter a series of blind holes 32 opening out on the top face of the drum.
  • the latter is fitted with slight friction by means of its axial bore 31 on a spindle 33 rendered fast with the corresponding part of the plate 34 of the head of the machine, for example by means of a clamping nut 35.
  • the spindle 33 is provided axially with a threaded blind hole 36.
  • a cover 37 Through which extends the cylindrical upper portion of a screw 38 engaged in threaded blind hole 36 in the spindle 33.
  • the bottom face of the cover is provided with a number of studs 39 equal to the number of blind holes 32 in the drum 1 each stud engaging in a blind hole and compressing a coil spring 40.
  • a control and braking device for said pin-carrying drum comprising in combination, at least one ratchet wheel fixed coaxially in the pin-carrying drum and having a plurality of ratchet teeth one of said teeth being of greater length than any other tooth on said ratchet wheel, an oscillating lever mounted on said support adjacent said pin-carrying drum, a pawl supported on said oscillating lever and having a tip portion adapted to selectively engage said ratchet wheel, a cam adapted to shift said oscillating lever periodically, means for modifying the stopping position of said oscillating lever in order to reduce the amplitude of its movements caused by said cam, and elastic means urging said pin-carrying drum and its coaxial ratchet wheel against said fixed support.
  • said oscillating lever has a profiled part at one end and a fixed stop at one side of said profiled part, a longitudinal blind passage formed in the thickness of said lever, a finger slidably mounted in said blind passage and constituting a movable stop, said pawl further having tWo shoulders, one of said shoulders cooperating with the fixed stop on said lever and the other one of said shoulders cooperating with said movable stop, and a return spring located in said blind passage for permanently urging said finger towards said other shoulder of said pawl.
  • a device according to claim 1 wherein said lever has a wide transverse protuberance, and a stud carried on said protuberance, said cam contacting said stud for oscillating said lever.
  • a device further comprising a recess in the protuberant portion of said oscillating lever, a rocking lever carried by said oscillating lever and having an end portion extending into said recess, said rocking lever having another end portion extending beyond the protuberant portion of said oscillating lever, said rocking lever further having a pair of stepped shoulders on the last-mentioned end portion, an annular element concentric with said cam, a pin carried by said annular element, said annular element being movable to an operative position wherein said pin engages the shoulders on said rocking lever when said cam engages said stud, another longitudinal blind passage formed in the thickness of said oscillating lever adjacent the first-mentioned blind passage, another finger slidably mounted in said other blind passage and extending into said recess, and elastic means urging said other finger towards the first mentioned end portion of said rocking lever.
  • said cam are such that movement of said cam moves said oscillating lever to cause the tip of said pawl to shift through an amplitude equal to one and one-half teeth of lesser length of said ratchet wheel.
  • a device wherein said ratchet Wheel, said pawl, said oscillating lever, said rocking lever, the shoulders on said rocking lever, the annular element, and the pin carried thereby are such that when said pin engages one of the shoulders on said rocking lever and said cam is moved, said oscillating lever is moved to cause the tip of said pawl to shift through an amplitude equal to one tooth of lesser length of said ratchet wheel, and when said pin engages the other of said shoulders on said rocking lever, said oscillating lever is moved to cause the tip of said pawl to shift through an amplitude such that is disengaged from said ratchet wheel.
  • a device wherein the length of the tooth of greater length on said ratchet Wheel is such the tip of said pawl will engage thereon when moved through an amplitude equal to one and one-half teeth of lesser length on said ratchet Wheel, and will not engage said tooth of longer length when the movement of the tip of said pawl is equal to an amplitude of one tooth of lesser length on said ratchet wheel.
  • the braking portion of said device comprises a spindle carried by said fixed support, said pin-carrying drum being supported on said spindle, a cover carried by said spindle and enclosing the top of said drum, and elastic means carried by said cover and engaging said pin-carrying drum for urging said drum in contact with said fixed support.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US23795A 1959-04-24 1960-04-21 Control and braking device for pincarrying drums of circular knitting machines and the like Expired - Lifetime US3086378A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT698159 1959-04-24
IT698259 1959-04-24

Publications (1)

Publication Number Publication Date
US3086378A true US3086378A (en) 1963-04-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
US23795A Expired - Lifetime US3086378A (en) 1959-04-24 1960-04-21 Control and braking device for pincarrying drums of circular knitting machines and the like

Country Status (6)

Country Link
US (1) US3086378A (en, 2012)
CH (2) CH363116A (en, 2012)
DE (1) DE1231383B (en, 2012)
FR (1) FR1256728A (en, 2012)
GB (2) GB927334A (en, 2012)
NL (2) NL250745A (en, 2012)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245231A (en) * 1963-09-02 1966-04-12 Bentley Eng Co Ltd Racking means for circular knitting machines
US3298202A (en) * 1962-09-18 1967-01-17 Philip Morris Knitting machine and method of knitting
USD962299S1 (en) * 2019-06-12 2022-08-30 Santoni S.P.A. Textile machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3541811A (en) * 1968-06-25 1970-11-24 Monarch Intern Ltd Adjustable mounting for inclined design wheels

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2382757A (en) * 1944-08-12 1945-08-14 Hemphill Co Pattern drum operating mechanism
US2868002A (en) * 1955-06-20 1959-01-13 Ferraguti Luigi Control device for circular knitting machines
US2927447A (en) * 1956-02-01 1960-03-08 Fidelity Machine Company Inc Pattern drum indexing mechanism

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1092577A (en) * 1910-03-21 1914-04-07 Kilbourn Mfg Corp Circular-knitting machine.
BE345961A (en, 2012) * 1927-02-25
US2179711A (en) * 1937-08-26 1939-11-14 Mellor Bromley & Co Ltd Patterning mechanism for knitting machines
BE531200A (en, 2012) * 1954-04-07
DE1042824B (de) * 1954-09-27 1958-11-06 Carl Merz K G Maschf Schloss fuer Doppelzylinder-Rundstrickmaschinen
FR1156548A (fr) * 1956-07-25 1958-05-19 Dispositif pour la fabrication d'un tissu indémaillable en vue de la confection de bas sans couture sur métiers à tricoter circulaires

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2382757A (en) * 1944-08-12 1945-08-14 Hemphill Co Pattern drum operating mechanism
US2868002A (en) * 1955-06-20 1959-01-13 Ferraguti Luigi Control device for circular knitting machines
US2927447A (en) * 1956-02-01 1960-03-08 Fidelity Machine Company Inc Pattern drum indexing mechanism

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3298202A (en) * 1962-09-18 1967-01-17 Philip Morris Knitting machine and method of knitting
US3245231A (en) * 1963-09-02 1966-04-12 Bentley Eng Co Ltd Racking means for circular knitting machines
USD962299S1 (en) * 2019-06-12 2022-08-30 Santoni S.P.A. Textile machine

Also Published As

Publication number Publication date
NL250745A (en, 2012) 1964-02-25
NL250747A (en, 2012) 1964-02-25
FR1256728A (fr) 1961-03-24
GB927334A (en) 1963-05-29
CH363116A (fr) 1962-07-15
DE1231383B (de) 1966-12-29
GB927335A (en) 1963-05-29
CH363432A (fr) 1962-07-31

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