EP0082988A1 - Pickervorrichtung für Rundstrickmaschinen - Google Patents

Pickervorrichtung für Rundstrickmaschinen Download PDF

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Publication number
EP0082988A1
EP0082988A1 EP82111195A EP82111195A EP0082988A1 EP 0082988 A1 EP0082988 A1 EP 0082988A1 EP 82111195 A EP82111195 A EP 82111195A EP 82111195 A EP82111195 A EP 82111195A EP 0082988 A1 EP0082988 A1 EP 0082988A1
Authority
EP
European Patent Office
Prior art keywords
pickers
lever
picker
lugs
butts
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.)
Withdrawn
Application number
EP82111195A
Other languages
English (en)
French (fr)
Inventor
Francesco Lonati
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.)
Lonati SpA
Original Assignee
Lonati SpA
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
Priority claimed from IT25845/81A external-priority patent/IT1140178B/it
Priority claimed from IT2167482U external-priority patent/IT8221674V0/it
Application filed by Lonati SpA filed Critical Lonati SpA
Publication of EP0082988A1 publication Critical patent/EP0082988A1/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B9/00—Circular knitting machines with independently-movable needles
    • D04B9/20—Circular knitting machines with independently-movable needles with provision for narrowing or widening; with reciprocatory action, e.g. for knitting of flat portions

Definitions

  • This invention relates to an improved picker device for circular knitting machines, comprising two needle raising pickers pivotally carried on a supporting structure adjacent the needle cylinder and extending substantially radially to the needle cylinder, the pickers having each one end for engagement with butts of needles or needle lifting instruments and being movable with such ends along substantially an arc of a circle between a low position of engagement with said butts and a high position of release thereof.
  • a device such as this is well known to persons skilled in the art.
  • the pickers are normally held in the low or home position by a torsion spring, which also provides for their returning to the home position after they have been engaged by the butts and moved to the high position.
  • a torsion spring which also provides for their returning to the home position after they have been engaged by the butts and moved to the high position.
  • the pickers slide at first on the butts of the needles or needle lifting instruments (e.g. sliders ) which keep moving at the same level as the home position of the pickers. It will be appreciated that said sliding action, which reiterates after each needle lifting or raising operation, results with time in a higher rate of wear of the pickers and butts.
  • Another object of this invention is to provide a device as indicated, which can effectively avoid damage to and/or breaking of the pickers, while allowing the traditional construction of needle raising picker devices to be kept for the most part unaltered, thereby it advantageously lends itself for installation on existing machines as well.
  • an improved picker device for circular knitting machines of the type specified in the preamble, which is characterized in that at the end remote from the working end the pickers have lugs cooperating with guiding and blocking means adapted to block the pickers alternately at the high position thereof and release the pickers alternately toward the low position thereof.
  • the pickers are blocked once they have reached their high position and hence are not immediately returned to the home position. Thus, they are no longer allowed to slide over the butts of needles or sliders left in the operative track. In this way any wear of both the pickers and butts is fully prevented and the machine can be operated even at high speeds without problems.
  • the guiding and blocking means are so configured ds to act alternatively on the pickers.
  • the picker which is being engaged by the butts of needles or sliders for transfer from the low position to the high position is enabled itself to provide for releasing the other picker, which can occupy accordingly its position of engagement for the next rotation of the needle cylinder in the opposite direction.
  • the picker which raised the butts remains instead in turn blocked.
  • the inventive device may be advantageously incorporated to existing machines as well, without requiring any complicated conversion work.
  • the picker supporting structure may be made tiltable outwardly to a position such that the working ends of the pickers no longer interfere with the area to be occupied by the needle or slider butts, so that any broken butts are prevented from striking the pickers and damage them.
  • a picker device 1 which comprises, in a manner known per se, a supporting structure 2 located adjacent a needle cylinder C - (Fig.3) and carrying two pickers 3 in an articulated fashion.
  • the latter are each formed with a traditional working end adapted for engagement with butts 4 of needles 5 ( Figure 8) or butts of other needle lifting instruments, in particular butts 6 of sliders 7 ( Figures 3,6,9,11).
  • the pickers 3 are journaled, along converging axes, to respective opposedly located lugs 8 on a carrier body 9 which is journaled to the structure 2 along an axis 10 substantially perpendicular to the plane of symmetry of the structure.
  • a conventional torsion spring 11 which acts as a return spring, also in a conventional manner.
  • the picker- device 1 is brought into its working or operative position, shown in detail in Figure 3.
  • the pickers 3 extend substantially radially to the needle cylinder and their working ends are movable substantially along an arc of a circle between a low position of engagement with the butts 4 or 6 of the needles 5 or sliders 7, and a high position of release of the butts.
  • the pickers 3 are each provided with a lug 16 cooperating with guiding and blocking means generally indicated at 17.
  • Such means are adapted to block the pickers 3 alternately in the high position and alternately release them toward the low position, as will be explained hereinafter.
  • the lugs 16 have a peg-like configuration and are substantially aligned with the working ends of the respective pickers 3.
  • the guiding and blocking means 17 comprise a pair of contoured levers 18 and 19, which are individually journaled to the carrier body 9 externally to the device 1 by means of a pivot pin 20 extending in the plane of symmetry of the device 1 and directed substantially radially to the needle cylinder.
  • each lever has an upper arm whose end is configured at the bottom as a hook 18a, respectively 19a, adapted to engage and retain the lug 16 of the associated picker 3.
  • each lever is bent downwards and has a portion formed with an upper profile 18b, respectively 19b, substantially parallel to the major dimension of the corresponding lever and ending in an end portion directed downwardly and having an oblique upper profile 18c, respectively 19c..
  • the profiles 18b,18c,19b,19c define guiding profiles for the lugs 16, which are movable between the top or upper arm of a lever and the lower or bottom associated arm of the other lever, as will be explained hereinafter. Owing to the provision of the spring 21, the ends of the levers 18,19 always engage with the lugs 16.
  • the sloping profile 18c, respectively 19c is slightly concave upwardly.
  • This device operates as follows.
  • the device 1 occupies the position shown in Figure 3.
  • the first butt 6 of the sliders 7 engages the right-hand picker 3 in the figure, turning the cylinder in the direction of the arrow.
  • the butt 6 entrains the picker 3 therealong in a conventional fashion, as schematically shown in Figure 4.
  • the lug 16 of the right-hand picker first slides over the sloping profile 19c of the lever 19 until it meets the hooked end 18a of the other lever 18 ( Figure 5).
  • the guiding and blocking means for the pickers 3 comprise a single lever 22, pivoted centrally to a fixed support 23 and having profile ends 22a and 22b.
  • the lever ends are configured substantially hook-like, the hooks facing in opposite directions, and are respectively provided with a guiding profile substantially in the shape of an arc of a circle whose center is non-coincident with the rotation center of the respective picker 3.
  • the lever 22 is subjected to the action of a torsion spring 24, which tends to pivot it in a counterclockwise direction relatively to the fixed structure 25. With this arrangement, the right-hand end 22b of the lever 22 has its hook facing upwards and the left-hand end 22a has a hock facing downwards.
  • the end profiles of the lever 22 are formed on separate plate-like portions attachable to the lever 22 such as to allow adjustment in the lengthwise direction of the lever itself.
  • the pickers 3 are in this case pivoted directly to the fixed structure 25, similarly to conventional devices. They are provided, however, in addition to the previously described lugs 16, with second lugs 26 directed radially in concurrent directions, wherewith respective vertical pegs 27 carried on a structure 28 movable vertically with respect to the fixed structure 25 are arranged to cooperate. More specifically, the pegs 27 are rigid with a horizontal cross-piece 29, carried on a small guiding cylinder 30 movable vertically in a cylindrical seat defined in the fixed support 23.
  • the small cylinder 30 has a throughgoing cross opening 31 which receives one end of a control lever 32, pivoted to a fixed arm 33 of the fixed structure 25 and having another end connected to a link 34. The latter is controlled by the machine program, as explained hereinafter.
  • the control lever 32 is subjected to the action of a torsion spring 35 which holds it in the position of Figures 13 and 17, i.e. in an inoperative condition to which there corresponds a lowered position of the movable structure 28.
  • the pegs 27 will depress the radial lugs 26 of the pickers 3, and the latter are.both held in the raised position, out of the path of travel of the butts of needles or sliders.
  • the link 34 is pulled downwards, the movable structure 28 is raised and the pickers 3 are both released to the low position, which corresponds to the traditional position of engagement with the butts during the phase of exclusion of the needles from knitting.
  • the horizontal cross-piece 28 has a substantially radial portion 36, which cooperates with a tab 37 on the lever 22.
  • the arrangement is such that the tab 37 and portion 36 oppose the bias of the torsion spring 24 acting on the lever 22..
  • the lever 22 In the inoperative position of the device ( Figures 13,14 and 17), the lever 22 is held, by the portion 36 and tab 37, in a rotated position such that its ends 22a and 22b are out of the path of travel of the lugs 16 of the pickers 3. With the device in the operative position ( Figures 15 and 16), the lever 22 is released by the portion 36 under the bias of the torsion spring 24 to a position whereat its ends cooperate with the lugs 16 in the following manner.
  • both pickers 3 are released to the position whereat their working ends are level with the working track of the butts of needles and sliders.
  • the lug 16 of the right-hand picker engages with the profile end 22b of the lever 22, to cause a progressive rotation of the same in a clockwise direction, against the bias of the torsion spring 24.
  • the right-hand picker Upon the right-hand picker reaching its highest position, its lug 16 remains blocked in the hooked end 22b of the lever 22 owing to the action of the spring 24 ( Figure 19).
  • profile ends 22a and 22b of the lever 22 may be reversed, as shown in Figures 22 and 23.
  • also reversed would be the torsion spring 24 and the arrangement of the tab 37. The operation would be equivalent to that described hereinabove.
  • the levers 18 and 19 or 22 operate, so to speak, automatically, i.e. without requiring any specially provided control, thereby the device is specially simple from the constructional standpoint.
  • the incorporation of the inventive device to existing machines poses no problems.
  • the device described hereinabove is susceptible to many modifications and variations, without departing from the scope of the instant inventive concept.
  • the levers 18, 19 could have a different profile configuration, or the carrier body 9 be made rigid with the supporting structure 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP82111195A 1981-12-24 1982-12-03 Pickervorrichtung für Rundstrickmaschinen Withdrawn EP0082988A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT25845/81A IT1140178B (it) 1981-12-24 1981-12-24 Dispositivo alza-aghi perfezionato in una macchina circolare per maglieria
IT2584581 1981-12-24
IT2167482U 1982-04-23
IT2167482U IT8221674V0 (it) 1982-04-23 1982-04-23 Dispositivo alza-aghi in una macchina circolare per maglieria.

Publications (1)

Publication Number Publication Date
EP0082988A1 true EP0082988A1 (de) 1983-07-06

Family

ID=26327966

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82111195A Withdrawn EP0082988A1 (de) 1981-12-24 1982-12-03 Pickervorrichtung für Rundstrickmaschinen

Country Status (1)

Country Link
EP (1) EP0082988A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000019846A1 (en) * 1998-10-01 2000-04-13 Oreste Schiavello Improved footwear garment, method of manufacture and knitting machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE454962C (de) * 1925-06-06 1928-01-21 Curt Hilscher Verfahren und Rundstrickmaschine zur Herstellung einer schlanken Spitze an Struempfen und Socken
US2372554A (en) * 1941-03-15 1945-03-27 Toone Nottingham Ltd B Method of knitting hosiery and circular knitting machine therefor
GB938506A (en) * 1960-01-05 1963-10-02 Armes De Guerre Fab Nat Improved device for effecting the narrowing in knitting machines
US3535893A (en) * 1969-01-06 1970-10-27 North American Rockwell Needle picker control means for circular knitting machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE454962C (de) * 1925-06-06 1928-01-21 Curt Hilscher Verfahren und Rundstrickmaschine zur Herstellung einer schlanken Spitze an Struempfen und Socken
US2372554A (en) * 1941-03-15 1945-03-27 Toone Nottingham Ltd B Method of knitting hosiery and circular knitting machine therefor
GB938506A (en) * 1960-01-05 1963-10-02 Armes De Guerre Fab Nat Improved device for effecting the narrowing in knitting machines
US3535893A (en) * 1969-01-06 1970-10-27 North American Rockwell Needle picker control means for circular knitting machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000019846A1 (en) * 1998-10-01 2000-04-13 Oreste Schiavello Improved footwear garment, method of manufacture and knitting machine
US6457332B1 (en) 1998-10-01 2002-10-01 Oreste Schiavello Footwear garment, method of manufacture and knitting machine

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19831227

STAA Information on the status of an ep patent application or granted ep patent

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Effective date: 19850303

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LONATI, FRANCESCO