US3174307A - Thread changing apparatus - Google Patents

Thread changing apparatus Download PDF

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Publication number
US3174307A
US3174307A US93804A US9380461A US3174307A US 3174307 A US3174307 A US 3174307A US 93804 A US93804 A US 93804A US 9380461 A US9380461 A US 9380461A US 3174307 A US3174307 A US 3174307A
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United States
Prior art keywords
thread
knitting
clamping
ring
reinforcement
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Expired - Lifetime
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US93804A
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English (en)
Inventor
Mayer Werner
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.)
Rieter Ingolstadt GmbH
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Schubert und Salzer Maschinenfabrik AG
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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
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/54—Thread guides
    • D04B15/58—Thread guides for circular knitting machines; Thread-changing devices
    • D04B15/60—Thread guides for circular knitting machines; Thread-changing devices with thread-clamping or -severing devices
    • D04B15/61—Thread guides for circular knitting machines; Thread-changing devices with thread-clamping or -severing devices arranged within needle circle
    • 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
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/54—Thread guides
    • D04B15/58—Thread guides for circular knitting machines; Thread-changing devices

Definitions

  • INVENTOR WERNER MAYER arch 23, 1965 w, MAYER THREAD CHANGING APPARATUS Filed March 6, 1961 4 Sheets-Sheet 3 INVENTOR y E? J a WERNER MAYER 4 Sheets-Sheet 4 arch 23, 1965 Filed March 6, 1961 m N Y m! INVENTOR WERNER MAYER dug/ME $952M United States Patent M 3,174,307 THREAD CHANGING APPTU Werner Mayer, Ingolstadt, Germany, assignor to Schubert & Salzer Maschinenfabrik Alrtienippo, Ingolstadt (Danube), Germany, a corporation of Germany Filed Mar. 6, 1961, Ser. No. 93,84l4 Claims priority, application Germany, Mar.
  • the present invention relates to a thread changing apparatus for circular knitting machines, and more particularly for circular knitting machines used for the production of seamless hose, wherein the reinforcement thread is severed immediately adjacent the edge of the reinforcement portion during the knitting operation.
  • clamping and severing device Since the clamping and severing device should, therefore, in each instance, assume a definite position relative to the thread guide in order to clamp and sever a thread, it is necessary to associate a separate clamping and severing device with the reinforcement thread guide which is laterally disposed relative to the principal thread guide. This, however, is impossible to achieve owing to the limitations of space.
  • the thread should moreover be severed as near as possible to the edge of the reinforcement portion, in order to ensure that the remaining thread ends are short and unnoticeable.
  • the arrangements used heretofore for this purpose generally speaking, have been too complicated and do not in fact fulfilll the desired requirements.
  • the thread grippers or clamps are actuated by means of a cam ring rotatably and co-axially disposed relative to the cylinder in relation with the pattern drum or pattern chain generally customarily used in circular knitting machines for the production ofhosiery (see British Patent 810,225).
  • the thread grippers are actuated by means of a cam ring during the knitting operation using the principal thread guide whereas during the knitting of the reinforcement portion, the thread grippers are actuated by means of another continuously rotating cam ring in relation with cylinder rotation.
  • a coupling ring bearing against an abutment ring the continuously rotating cam ring is lifted and is thereby placed in the position required for the actuation of the grippers.
  • FIGURES 1 and 2 show the burner-carrying rings in the various positions relative to the thread guides, in plan View;
  • FIGURE 3 shows the withdrawal of the reinforcement thread in a perspective view
  • FIGURE 4 shows the insertion of the reinforcement thread in a perspective view
  • FIGURE 5 shows the control device for the actuation of the thread gripper, in section
  • FIGURE 5a shows a detail taken from FIGURE 5 in plan view
  • FIGURE 6 shows a perspective view of a detail taken from FIGURE 5;
  • FIGURE 7 shows the disposition of the severing unit in section
  • FIGURE 8 shows a detail taken from FIGURE 7, in plan view
  • FIGURE 9 illustrates the control of the reinforcement thread guide in the withdrawn position, in section, in accordance with an alternate embodiment of the invention.
  • FIGURE l0 shows a perspective View of the reinforcement thread guide inserted by means of the lugs or butts of the needles selected to work the reinforcement portion, covering the alternate embodiment shown in FIGURE 9;
  • FIGURE-11 shows the disposition of the feeler jaw of FIGURE 10 in plan view.
  • the invention may also be utilized to advantage, however, in the case of circular knitting machines exhibiting a ditferent'number of feeds.
  • FIGURE 1 shows the ring 9 supporting the thread guides.
  • the principal thread guides F F and F are disposed at the feeds or stations I to IV, and the reinforce.
  • ment thread guide 8 in diagrammatical plan view.
  • the cylinder with the needles N rotates counter-clockwise in the direction of arrow P.
  • Severing units 5, associated with the corresponding principal, thread guides F, are disposed on the ring 11 to allow the threads to be severed.
  • the reinforcement thread guide 8 as well as the principal thread guides F and F are withdrawn during the. knitting of the nonreinforced tfabric portions. Only one principal thread guide F is in operating position at each feed station. The withdrawn threads are clamped beneath the grippers 2.
  • the suction nozzle means includes pipe 1 as a tubular suction nozzle member and gripper 2 as a tubular extension member, said members being concentrically positioned for telescopic movement with respect to one another, for extension and withdrawal ofthe extension member, i.e. gripper 2.
  • the gripper 2. is opened, i.e. withdrawn, in order to allow the reinforcement thread to be brought beneath the pipe aperture for clamping purposes.
  • a 'suitablesource of suction will be applied to pipe 1 so that suction will be available when gripper 2 is raised or withdrawn as shown in FIGURE 3.
  • the needle N will pass through the positions N to N carrying the thread F along therewith.
  • the thread F touches the severing device 5,, the same being an electrically heated severing unit, for example, whereby such thread is severed.
  • the unattached thread end is sucked into the opening of pipe 1 since gripper 2 is still in raised position.
  • Gripper 2 is then extended or clamped against the burner-carrying ring 11 and the dial cap 6 in response to downward movement by control rod 7.
  • the burner-carrying ring. 11 is suitably disposed for slidable displacement along a peripheral groove in dial cap 6 and the thread guide 8,, is suitably actuated by means of rod 8,, in the direction of the arrows P and P by conventional control linkages.
  • FIGURE 4 illustrates the insertion of the reinforcement thread F at the starting row of the reinforcement portion in a similar manner to that covered in FIGURE 3.
  • the thread guide 8 inserts the thread, clamped by means of gripper 2, in front of the first needle N taking part in the working of the reinforcement portion.
  • the thread is consequently grasped and drawn along by the needle N through the positions N to N
  • the clamped thread F touches the severing unit or burner 5, so that the clamped thread end is left behind to be drawn off by suction through pipe 1 when the gripper 2 is next raised.
  • the severing unit 5 is constructed and disposed in the mannner shown in FIGURES 7 and 8.
  • the burner-carrying ring 11 isrotatably positioned upon the dial cap 6 and is secured against axial displacement by means of a bracket 11.
  • a burner-ring comprising separate pieces 5' and the severing units 5 connecting the latter, is, for example cast into the burner-carrying ring 11 with an insulatingmass 5".
  • the severing unit 5 then projects upwardly and laterally beyond the periphery of the burner-carrying ring 11 as well as beyond that of the dial cap 6.
  • the needlesN will travel past close to the severing unit 5 whereby the thread will be severed a very short distance behind the last stitch.
  • the positioning of the particular transfer jack I with respect to the needle N passing thereby is shown in relation to the position of the burner or severing unit 5.
  • FIGURES 5, 5a, and 6 illustrate the control means for the thread grippers 2 which upon being associated with the principal thread guides F are actuated by means of the pattern drum or pattern chain employed (see British Patent 810,225).
  • the thread grippers 2, on the other hand, are in each instanceactuated in relation to the cylinder rotation where they are associated with the reinforcement thread guides 8'.
  • the accompanying drawings illus trate only such parts as are necessary toan understanding of the operation of the object of the presenttinvention.
  • the rotation of burner-carrying ring 11 as well as that of the suction pipes 1 occurs jointly and is actuated in relation to the pattern drum.
  • the transmission links for said rotary motion acts .on the one arm of the angle lever 15 Whereas the other arm of the angle lever 15 straddles the pipe 1 in the manner of a fork as illustrated in FIG- URES 5 and 5a.
  • the angle lever 15 is attached to a vertical shaft 16 secured on the one hand in the gear case 22 and on the other hand in a bearing block 17 attached to, the flange of the dial cap 6, said shaft being rotatably mounted.
  • An additional fork lever 18 which actuates the burner-carrying ing 11, by means of pin '19, is attached to the lower extremity of the shaft 16.
  • thread guides F and F are shown, thread guide the upper cam surface for actuating the thread guides F. This arrangement is described in detail in co-pending' US. application Serial No. 42,355, filed July 12, 1960.
  • Two butts or lugs and 26, which operate in conjunction with the corresponding cam rings 27 and 29, respectively are disposed on the draw rod 7 in order to control the thread gripper 2.
  • the gripper 2 is controlled by means of the pattern drum acting through the cam ring 27 mounted co-axially to the cylinder axis in a rotatable manner.
  • the gripper 2 By rotating the control ring 27 in the direction shown by the arrow P the butts 25 of the draw' rod 7 impinge on the oblique cam surface 28, the gripper 2 thereby being opened.
  • the' thread gripper 2 When withdrawing and inserting the reinforcement thread in order to produce partially reinforced fabric areas, the' thread gripper 2 must be actuated for each revolution of the cylinder.
  • cam ring 29 which is co-axially mounted relative to the axis of the cylinder on a cam ring support means, i.e. coupling ring 32.
  • Cam ring 29 revolves continuously at the same speed as the cylinder, receiving its drive through the pins 39 from the driving disc 41 and the spur gear 42 operatively connected with drive gear 43 for driving the dial 6.
  • the pins 39 are secured in the rotating cam ring 29 and are slidably disposed in the axial direction in guide bores 49 of the driv-.
  • FIGURE 6 illustrates more specifically the operation of the cam rings 27 and 29 and-of the coupling ring 32.
  • the butts 26 of the draw rod 7 do not come into engagement with the rotating cams 30, that is to say the thread grippers 2 are actuated by means of the cam ring 27 during association with the principal thread guides.
  • the thread gripping andsevering device is associated with the reinforcement thread guide 8
  • the pattern drum not only causes the rotary displacement of the burner-carrying ring 11 and of the suc tion pipe 1, but simultaneously also of the coupling ring 32 in the direction shown bythe arrow P During this time, the cam ring 27 remains in its idle position. Owing to the rotation of the cam ring support means.
  • top support cam ring i.e. coupling ring 32
  • the oblique faces 38 of the secondring cam means or bottom cam ring, i.e. stationary abutment ring 31, and the corresponding faces 37 of the coupling ring 32 slide on' each other so that coupling ring- 32 willv be upwardly displaced in axial direction.
  • the rotating cam ring 29 is thereby lifted simultaneously, so that the clamps or gripers will now be actuated by the cam surfaces 30 acting through the butts 26 of the draw. rods 7.
  • the drawrodsj 7 are guided in the slots of the coupling ring32 and are rotatably displaced with the latterwhen ring 32 is rotatably displaced by the cam drum linkage in the direction of the arrow P and in the return direction Accordingly, the butts 25 will slidealong the straight recess surfaces 36 of thecam ring 27.
  • the-radially outer undersurface 34 of ring 32 will slidably engage the top surface 33 of the ring 27 at the start of the rotatable movement of ring 32 and of course the surfaces 34 and 33
  • the top end ofthe'grippers 2 is in eachcaseinserted within anelongated slot 20 for communication with the suction chamber 21 thereabove.
  • the slot 20 corresponds in shape to the rotary path of movement of the clamping and severing devices.
  • the thread guides F and 3 are in known manner controlled in relation to a pattern drum, as for example, is described in co-pending US. application Serial No. 42,355. However, in the case of a modified form of the present invention, as shown in FIGURES 9, 10, and I1, provision is made for separately controlling the reinforcement thread guide 3 which renders it possible to sever the reinforcement thread at the edges of the reinforcement portion, where a variable width of the reinforcement area is encountered.
  • the thread guide 8 is in this case controlled by means of a feeler unit 79 detecting the needles N selected to work the reinforcement portion.
  • the needles N are selected in known manner, e.g. by means of a pattern device, such as is described in co-pending US. application, Serial No. 852,915, filed November 13, 1959, now abandoned.
  • the feeler unit 74 is pivotably mounted about a pin gripper 2 and the suction pipe 1, the latter being indicated inthe drawing in phantom.
  • the feeler unit 7 0 is rocked back by means of a spring 75 located on the rod 8,,, whereby the reinforcement thread guide 8a is withdrawn from its operating position, in the manner previously described.
  • the reinforcement thread may, therefore, be severed at the edges of the reinforcement portion of the fabric even where said portion is of variable width,
  • a suitable actuating cam C may be used in the normal manner to raise the needles N selected for knitting the reinforcement portion of the hose, by contacting theneedle butts N of these needles; As theraised needle butts N pass in the direction of the arrow P during cylinder rotation, the'same c'ontact'the feeler jaw 71 moving the same in the direction of the arrow P as'noted in'FIGURE 11. After the needle butts N of the needles N have run past, spring 75 will urge the feeler unit 70 in the direction of the arrow P However, because of the presence of stop 76 on collar 72, the feeler jaw 71 will not interfere withthe normal running of the needles. a
  • the thread guide 8a is positioned on the carrier ring 9 which is maintained by the carrier ring 9'; the thread guide 8a, the burner-carrying ring 11, the dial gripper 2 is clearly indicated in FIGURE9.
  • a circular knitting machine having means for forming knitted tubular fabric including a needle cylinder, needles disposed in said cylinder, elements cooperating with the needles for formation of stitches at least at one knitting station, cams for effecting needle movements at said knitting station, main yarn feeding means.
  • each said feeding means being movable from an active yarn feeding position wherein yarn is fed to said needles for knitting thereby at said station to an inactive yarn feeding position wherein the yarn is in non-knittingposition, and means for clamping and cutting, the improve-- ment which comprises including as said means for clamping and cutting said yarn a common clamping and cutting means for the yarns at each said knitting station, said clamping andcutting means being .mounted on support means for joint displacement from one position adjacent to the main yarn feeding means at said knitting station to another position adjacent to the reinforcement yarn feeding means at the same station and means for-actuating the clamping means and energizing the cutting means at said position.
  • said common clamping and cuttingmeans include a separate clamping member mounted on a support ring concentrically positioned with respect to the cylinder and a cutting element mounted on a carrier ring, and means for jointly limitedly rotating said support ring and carrier ring for effecting said joint displacement.
  • the main yarn feeding means by a first cam ring concentrically positioned with respect to the cylinder and movable in one direction to effect opening of said clamping member and in the opposite direction to efiect closing tion in dependence upon the cylinder rotation, said second cam ring being axially displaceable during rotation from a first inactive axial position to a second active axial position to effect at said position adjacent to thereinforcement thread periodic opening feeding'means. and closing of said clamping member during continuous rotation at said active axial position.
  • said cam ring support means is a top support ring and said second ring cam means is a bottom cam ring, said top and bottom rings being concentrically disposed beneath said second cam ring, the undersurface of said top ring and the upper surface of said bottom ring being provided with cooperating cam surfaces for effecting axial displacement in one direction of said' top ring and, in. turn said second cam ring upon corresponding rotational move 7;
  • said clamping member includes a combined yarn clamping and suction means having a suction nozzle means and yarn engaging surface means arranged for relative movement'at each saidknitting station from a closed position in yarn clamping contact with respect to one another to.
  • said knitting machine includes a dial and a stationary dial cap thereover, said yarn engaging surface means being defined by the top surface of said dial cap and said cutting element carrier ring being slidably disposed in a peripheral groove defined in the peripheral portion of said dial cap.
  • said suction nozzle means includes a tubular suction nozzle.
  • extension member outwardly encloses said nozzle member and is axially slidablethereon, said extension member being normally resiliently urged into extended position.
  • Improvement according to claim 10 wherein a loaded coil spring disposed about said nozzle member is used to resiliently urge said extension member into extended position and a draw rodis connected to said extension member for axial movement thereof into and out of said clampingcontact.
  • said draw rod is provided with a first and a second projection butt thereon, said first butt being positioned for separate cam contact with said first cam ring at said one of said positions and said second butt being positioned for separate cam contact with said second earn ring at said other of said positions.
  • extension member is positioned between the yarn feeding means at each said knitting station and said cutting element for extension into clamping contact with said dial cap when the path of the yarn being knitted at the knitting station is situated intermediate said extension member and said dial cap.
  • said cutting element is an;electrical resistance wire heat element insulatedly disposed on said carrierv ring and projecting outwardly therefrom closely adjacentto the path of travel of the needles.
  • a circular knitting machine having means for forming knitted tubular fabric including a needle cylinder, needles disposed in said cylinder, elements. cooperating with the needles for formation of stitches at least at one knitting station, cams for effecting needle movements at each knitting station, first yarn feeding means and second yarn feeding means spaced fromeach other at each knitting station, each said feeding means being movable between an active yarn feeding position wherein yarn is fed to said needles for knitting thereby at said stationand an inactive yarn feeding position wherein the yarn is in non-knitting position, and means for clamping and for cutting said yarn, the improvement which com prises said means for clamping and for cutting said yarn including a common clamping and cutting means for the yarns at each said knitting station, said common clamping and cutting means being mounted onsupport means for joint displacement from one position adjacent to the first yarn feeding means at each said knitting station to another position adjacent *to the second yarn feeding means at the same station, and means for actuating the clamping means and energizing the cutting means at each said position.
  • a circular knitting machine having means for forming knitted tubular fabric including a needle cylinder, needles disposed in said cylinder, elements cooperating with the needles for formation of stitches at a plurality of separate spaced knitting stations, cams for effecting needle movements at each knitting station, main yarn feeding means and reinforcement yarn feeding means spaced from each other at each knitting station, each said feeding means being movable between an active yarn feeding position wherein yarn is fed to said needles for knitting thereby at the corresponding knitting station and an inactive yarn feeding position wherein the yarn is in non-knitting position at such corresponding knitting station, and means for clamping and for cutting said yarn, the improvement which comprises said means for clamping and for cutting said yarn including a common clamping and cutting means for the yarns at each said knitting station, said common clamping and cutting means including .a plurality of separate spaced clamping members, corresponding to the plurality of knitting stations, mounted on a support ring concentrically positioned with respect to the needle cylinder and a corresponding plurality of separate spaced cutting elements mounted

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Treatment Of Fiber Materials (AREA)
US93804A 1960-03-18 1961-03-06 Thread changing apparatus Expired - Lifetime US3174307A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DESCH27608A DE1148348B (de) 1960-03-18 1960-03-18 Fadenklemm- und -trennvorrichtung fuer Rundstrickmaschinen

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US3174307A true US3174307A (en) 1965-03-23

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US93804A Expired - Lifetime US3174307A (en) 1960-03-18 1961-03-06 Thread changing apparatus

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US (1) US3174307A (de)
CH (1) CH386604A (de)
DE (1) DE1148348B (de)
FR (1) FR1284283A (de)
GB (1) GB978804A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3257829A (en) * 1961-04-08 1966-06-28 Singer Co Yarn control means for circular knitting machines
US3392550A (en) * 1966-02-01 1968-07-16 Armes De Guerre Fab Nat Thread-cutting device for circular knitting machines
US3420076A (en) * 1965-11-10 1969-01-07 Ettore Luzzatto Method and device for severing and mechanically removing yarn ends in circular knitting machines for fine knitted goods,in particular stockings
US3496738A (en) * 1966-09-30 1970-02-24 Billi Spa Thread cutting device for circular knitting hosiery machines
US11332857B2 (en) 2016-06-15 2022-05-17 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Circular knitting machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1243321B (de) * 1963-01-28 1967-06-29 Gottlieb Eppinger K G Maschine Strumpfrundstrickmaschine
IT1247999B (it) * 1991-06-06 1995-01-05 Savio Spa Dispositivo per il cambio e il controllo delle alimentazioni di filo in una macchina circolare da maglieria a doppio cilindro.
IT1278167B1 (it) * 1995-01-25 1997-11-17 Matec Srl Gruppo di taglio e aspirazione del filo per macchina per la lavorazione di calze e calzini a piu' cadute

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1919123A (en) * 1931-04-02 1933-07-18 Scott & Williams Inc Binding and cutting mechanism for knitting machines
US2051701A (en) * 1936-08-18 Yarn finger for knitting machines
US2213143A (en) * 1936-06-20 1940-08-27 Nolde & Horst Co Knitting machine
US2245205A (en) * 1941-06-10 Varn binder for knitting machines
US2377729A (en) * 1942-05-15 1945-06-05 Toone Nottingham Ltd B Knitting and knitting machine
US2824436A (en) * 1957-02-27 1958-02-25 Hanes Hosiery Mills Co Yarn clamping and severing mechanism for knitting machines
US2908154A (en) * 1958-03-14 1959-10-13 Burlington Industries Inc Yarn handling and severing mechanism for circular knitting machines and method
US3030788A (en) * 1959-04-28 1962-04-24 Singer Fidelity Inc Method and apparatus for yarn end control
US3079779A (en) * 1956-12-06 1963-03-05 Gordon Company Yarn tensioning and severing mechanism for circular knitting machines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2810280A (en) * 1956-01-25 1957-10-22 Ralph K Rossman Clipping dial for circular knitting machine

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2051701A (en) * 1936-08-18 Yarn finger for knitting machines
US2245205A (en) * 1941-06-10 Varn binder for knitting machines
US1919123A (en) * 1931-04-02 1933-07-18 Scott & Williams Inc Binding and cutting mechanism for knitting machines
US2213143A (en) * 1936-06-20 1940-08-27 Nolde & Horst Co Knitting machine
US2377729A (en) * 1942-05-15 1945-06-05 Toone Nottingham Ltd B Knitting and knitting machine
US3079779A (en) * 1956-12-06 1963-03-05 Gordon Company Yarn tensioning and severing mechanism for circular knitting machines
US2824436A (en) * 1957-02-27 1958-02-25 Hanes Hosiery Mills Co Yarn clamping and severing mechanism for knitting machines
US2908154A (en) * 1958-03-14 1959-10-13 Burlington Industries Inc Yarn handling and severing mechanism for circular knitting machines and method
US3030788A (en) * 1959-04-28 1962-04-24 Singer Fidelity Inc Method and apparatus for yarn end control

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3257829A (en) * 1961-04-08 1966-06-28 Singer Co Yarn control means for circular knitting machines
US3420076A (en) * 1965-11-10 1969-01-07 Ettore Luzzatto Method and device for severing and mechanically removing yarn ends in circular knitting machines for fine knitted goods,in particular stockings
US3392550A (en) * 1966-02-01 1968-07-16 Armes De Guerre Fab Nat Thread-cutting device for circular knitting machines
US3496738A (en) * 1966-09-30 1970-02-24 Billi Spa Thread cutting device for circular knitting hosiery machines
US11332857B2 (en) 2016-06-15 2022-05-17 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Circular knitting machine

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Publication number Publication date
FR1284283A (fr) 1962-02-09
GB978804A (en) 1964-12-23
CH386604A (de) 1965-01-15
DE1148348B (de) 1963-05-09

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