US3678711A - Guide bar shogging mechanism for a warp knitting machine - Google Patents

Guide bar shogging mechanism for a warp knitting machine Download PDF

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Publication number
US3678711A
US3678711A US106661A US3678711DA US3678711A US 3678711 A US3678711 A US 3678711A US 106661 A US106661 A US 106661A US 3678711D A US3678711D A US 3678711DA US 3678711 A US3678711 A US 3678711A
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Prior art keywords
cam
moving
machine
members
guide bar
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Expired - Lifetime
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US106661A
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English (en)
Inventor
Harald Schneider
Cornel Wicha
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Karl Mayer Textilmaschinenfabrik GmbH
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Karl Mayer Textilmaschinenfabrik GmbH
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B27/00—Details of, or auxiliary devices incorporated in, warp knitting machines, restricted to machines of this kind
    • D04B27/10—Devices for supplying, feeding, or guiding threads to needles
    • D04B27/24—Thread guide bar assemblies
    • D04B27/26—Shogging devices therefor

Definitions

  • ABSTRACT Primary Examiner-Ronald Feldbaum A!trneyl(urt Kelman [5 7] ABSTRACT
  • the guide bars of a warp knitting machine are moved longitudinally in response to stored information scanned by a programming device and converted to electrical control signals.
  • a cam follower linked with each guide bar is engaged alternatively by two cams which are moved in a direction toward and away from the cam follower in response to the control signals.
  • the cam follower moves back and forth between the faces of the two cams in synchronization with the main machine drive.
  • Cam operated shogging mechanisms are still largely controlled by pattern chains or pattern wheels.
  • Cam elements on the moving chain or wheel engage a cam follower linked to each guide bar.
  • many individual cam elements must be brought into sequential engagement with the cam followers during each pattern repeat.
  • Such patterns cannot always be made by means of pattern wheels, the pattern chains employed must be very long so as to require much labor for setting up and substantial machine downtime for each change from one pattern to another.
  • the levers are set according to signals provided by a programming device in which as many channels must be provided as there are levers, and the information carrier employed must be equipped correspondingly.
  • the programming unit significantly increases the bulk of the knitting machine and of associated devices, and is not practical in a Raschel knitting machine having a multiplicity of guide bars.
  • the primary object of the invention is the provision of a guide bar shogging mechanism automatically controlled by a program source which consists of relatively few, simple, and compact elements, and can be operated by an information carrier provided with a minimum number of channels.
  • Another object is the provision of such a mechanism in which pattern changes can be achieved quickly and with little cost.
  • a warp knitting machine is provided with a guide bar shogging mechanism including a cam arrangement which cooperates with a cam follower operatively connected with the guide bar for simultaneous movement.
  • a program source generates programmed control signals in synchronization with the machine drive.
  • the cam arrangement includes two cam elements whose respective cam faces constitute portions of a cam track extending in a general direction.
  • a first moving device connected to the machine drive causes relative reciprocating movement of the cam elements and of the cam follower in the general direction of the cam track and thereby moves the cam follower back and forth along the track in alternating engagement with the faces of the two cam elements.
  • a second moving device responsive to the control signals of the program source moves the cam members in a direction transverse to the cam track direction relative to each other.
  • FIG. I is a fragmentary, side-elevational and partly diagrammatic view of a warp knitting machine of the invention.
  • FIG. 2 shows a modification of a portion of the device of FIG. 1;
  • FIG. 3 illustrates yet another modification of a detail in the device of FIG. 1 on a larger scale
  • FIG. 4 diagrammatically illustrates the horizontal position of a cam follower roller in the apparatus of FIG. 3 as a function of time during operation.
  • FIG. I there is shown only as much of an otherwise conventional knitting machine as is necessary for an understanding of the invention.
  • the structure illustrated is limited practically to the shogging machanism for one guide bar, and it will be understood that much of the illustrated apparatus is duplicated as many times as there are guide bars whose longitudinal movement needs to be controlled.
  • a reader 1 for punched paper tape is driven by a timing belt or chain in synchronization with the main drive shaft of the machine, not shown, and controls a selector switch assembly 2 controlling twelve circuits which respectively energize the coils of twelve solenoid valves 20, 21.
  • a rocker arm 3 pivotally mounted on the machine frame is oscillated by a radial cam 4 continuously rotated in synchronization with the main drive shaft and the reader 1.
  • the rocker arm 3 is held in engagement with the cam 4 by a tension spring 5 attached to the machine frame.
  • the rocker arm 3 carries two stacks 6,7 of six pneumatic actuating motors each, the motors being arranged in series so that the piston rods and cylinders of four actuating motors in each stack are fixedly fastened to respective cylinders or piston rods of adjacent motors.
  • One terminal motor in each stack is attached to the rocker arm 3 by a transverse bar 3a.
  • the free end portion 3b of the rocker arm 3 is approximately U-shaped, and compression springs 6a interposed between each stack 6,7 and the transverse or bight part of the rocker portion 3b normally drives the piston rods inward of the as sociated cylinders to reduce the stack to its minimum length or contracted condition.
  • the valves 20,21 control flow of compressed air from a non-illustrated source, such as a manifold on a tank, to the cylinders of the stacks 6,7 so as to expand each motor by a length differential which is of fixed magnitude for each motor.
  • the solenoid valves vent the associated cylinders to the atmosphere, thereby permitting the vented motors to be contracted by the springs 6a.
  • the piston rods of terminal motors in the stacks 6,7 which are remote from the bar 3a pass through openings in the bight part of the rocker arm portion 3b and are attached to respective ratchet bars 8 longitudinally guided along opposite faces on the leg parts of the rocker portion 3b by non-illustrated dovetail grooves and ribs.
  • the ends of the bars 8 remote from the attached piston rods carry elongated cam elements 9 which extend from each bar 8 toward the other bar and partly overlap in a longitudinal direction.
  • the teeth 10,11 of the bars may be engaged by respective pawls or detents 12,12a which are pivoted on the rocker portion 3b and biased toward engagement with the associated ratchet teeth by an interposed compression spring 13. Stops 14,15 fixedly mounted on the machine frame alternatively engage the detents 12,12a as the rocker 3 approaches the ends of its oscillating stroke and lift the detents from the engaged ratchet teeth.
  • each element 9 has two angularly offset portions 22,24 for cooperation with a cam follower roller 23 on a guide bar shogging lever 16.
  • the latter is connected to a partly illustrated guide bar 17 by a hinged link 19, as is conventional, and held in engagement with one of the cam elements 9 at all times by a tension spring 18 interposed between the guide bar 17 and the machine frame.
  • Each cam face portion 24 is circular approximately about the pivot axis of the rocker 3 so that the guide bar 17 does not move coursewise relative to the knitting needles and other non-illustrated and conventional knitting implements of the machine while the cam follower 23 engages a cam face portion 24 while the cam elements 9 participate in the oscillating movement of the rocker 3.
  • the cam face portion 22 is obliquely inclined relative to the circular arc of the associated cam face portion 24 in a direction having a major radially in ward component relative to the arc.
  • each stack 6,7 is thereby varied in steps corresponding to the strokes of the several piston rods in the stack.
  • the six motors in each stack change the length of the stack by l, 1, 2, 2, 4, 4 units respectively, the position of the roller 23 on the lever 16 being chosen in such a manner that the guide bar 17 is shifted one needle spacing relative to the non-illustrated needle bar of the knitting machine when the length of a stack 6,7 attached to a cam 9 engaged by the roller 23 changes by one unit.
  • the cam follower roller 23 then reaches the face portion 24 of the locked cam element 9 and rolls along the cam face portion to a stop while the angular position of the lever 16 remains practically unchanged so that the guide bar 17 may perform its swinging motion.
  • the detent 12a is disengaged from the ratchet teeth 11 as the rocker arm 3 reaches the end of its clockwise stroke, and the cam element 9 not engaged by the cam follower roller 23 may be shifted by its stack 7 of actuating motors to a different position in response to signals from the paper tape reader 1.
  • the guide bar 17 is shifted toward the right, while the cam follower 23 moves over the cam face portion 22 toward the illustrated position during counterclockwise movement of the arm 3, and the longitudinal position of the guide bar 17 remains the same to permit swinging motion of the guide bar, while the roller 23 moves downward over the face portion 24 from the position seen in FIG. 1.
  • the cam 9 not engaged by the cam follower may be moved toward or away from the cam track constituted by the several cam face portions 22,24 and extending generally longitudinally of the arm 16.
  • the guide bar 17 may therefore be moved in steps of any desired length within the combined range of the several motors in each stack, and successive steps may be made in the same direction or in opposite directions.
  • the cam element 9 engaged by the cam follower 23 is locked by the associated detent 12,12a while the other element is released for adjustment of its position.
  • the modified apparatus shown in FIG. 2 is identical with that described with reference to FIG. 1 as far as not illustrated. It is equipped with a support element 3 almost identical with the rocker arm 3, but fixedly mounted on the machine frame. It carries stacks 6,7 of pneumatic motors which set the positions of ratchet bars 8 and of cam elements 9' fixed on the bars and having transverse terminal face portions 22 corresponding to the afore-described face portions 22 in FIG. 1. They differ from the cam elements 9 in the configuration of their face portions 24.
  • Detents 12,12a are mounted on the support element 3' and biased by a spring 13 toward engagement with ratchet teeth 10,11 on the bars 8.
  • a cam follower roller 23 cooperates with the cam face portions 22,24 and is mounted on a shogging lever 16 for moving a guide bar 17 as described above.
  • the lever 16' is shifted longitudinally by a radial cam 25 which engages a cam follower roller 25a secured on the end of the lever 16 remote from the guide bar 17 by a pin 25d.
  • the pin projects from the lever 16 into a slot 25b in a bracket 25c fixedly mounted on the machine frame.
  • the slot 25b is elongated approximately logitudinally of the lever 16 in all operative angular positions of the latter.
  • the cam 25 is connected to the nonillustrated main drive shaft of the knitting machine by a timing belt or chain, as described with reference to the cam 4 in FIG. 1.
  • Steps 26,27 are mounted on the lever 16' and move toward and away from the detents 12,12a during rotation of the cam 25.
  • the apparatus illustrated in FIG. 2 operates in the same manner as described above with reference to FIG. I.
  • the rolling motion of the cam follower 23 along the cam face portion 22,24 in FIG. 1 is caused by the oscillations of the rocker arm 3.
  • the analogous movement of the cam follower along the cam face portions 22,24 in FIG. 2 is produced by longitudinal movement of the lever 16', the cam face portions 24' being contoured so that the guide bar 17 stands still while the cam follower 23 engages these face portions.
  • FIGS. 1 and 2 are not drawn to scale, and that the links 19 which hingedly connect the lever 16' to the guide bar 17 are long enough so that the longitudinal movement of the lever 16' has no significant effect on the longitudinal position of the guide bar 17.
  • the detents 12,12a are released from the ratchet teeth 10,11 when the stops 26,27 and the attached lever 16' reach the end of their common stroke.
  • the cam elements 9",9' have oblique terminal cam face portions identical with the afore-described cam face portions 22 and not requiring further description.
  • the cam face portions 24 are replaced by stepped faces, each step having a face portion circular approximately about the pivot axis of the rocker arm 3.
  • the cam face portion 28a of the cam element 9" which is remote from the free end of the cam element is nearer the pivot axis than the face portion 28b which extends to the end of the cam element, and the two face portions are connected by a steeply inclined surface.
  • the cam face portion 29a adjacent the free end of the cam element is nearer the pivot axis than the other cam face portion 29b.
  • FIG. 4 diagrammatically illustrates the movements of the roller 23 during one cycle of cam movements.
  • the roller initially engages the cam face portion 280 and moves at first upwardly, as viewed in FIG. 4, to the cam face portion 29a. This results in the underlap movement 30 shown in FIG. 4.
  • the initially opposite direction of the overlap stage is insignificant because the yarn guides are not located behind the latch needles at this time.
  • the actual underlap is caused by movement of the roller 23 from the cam face portion 28b to the portion 29a. After this underlap movement from 28a to 29a, the roller 23 stands still while traveling over the face portion 29a.
  • the roller 23 then continues its movement from the cam face portion 29a to the face portion 29b whereby an overlap 31 over one needle to the right is caused.
  • the direction of movement now is reversed and the steps described above are repeated in opposite order, that is, the roller 23 moves continuously from the face portion 29b to the face portion 28b to cause an underlap 30a, it further moves from the face portion 28b to the face portion 28a to produce an overlap 31a from the right to the left.
  • a pattern change is achieved in the guide bar shogging mechanism of the invention by simply changing the tape in the reader, an operation which requires virtually no time, and it may not even be necessary to stop the machine.
  • a programming unit other than that illustrated and described may be used without otherwise changing the apparatus, and the use of magnetized tape in cooperation with a suitable reader is specifically contemplated. Other variations will obviously suggest themselves to those skilled in the art.
  • a warp knitting machine including drive means, an elongated guide bar, and a guide bar mechanism for longitudinally moving said guide bar, said mechanism including cam follower means operatively connected to said guide bar for simultaneous movement, and cam means engaging said cam follower means, the improvement which comprises:
  • a. programming means for generating programmed control signals in response to operation of said drive means
  • said cam means including two cam members
  • cam members having respective cam faces constituting respective portions of a cam track extending in a general direction;
  • first moving means operatively connected to said drive means for causing relative reciprocating movement of said cam members and of said cam follower means in said direction and for thereby moving said cam follower means back and forth along said cam track in alternating engagement with said cam faces;
  • second moving means responsive to said control signals for moving each of said cam members in a direction transverse of said general direction relative to the other cam member.
  • said second moving means including actuating means associated with each cam member for moving the associated cam member in integral multiples of a unit step.
  • said actuating means each including a plurality of actuating members series-connected in said transverse direction, and operating means for expanding and contracting each of said actuating members in said transverse direction by a differential which is one of said multiples.
  • a common support carrying said cam members said first moving means including means for angularly moving said support about an axis remote from said cam track.
  • said faces having respective portions obliquely inclined relative to said predetermined direction and transverse to each other.
  • locking means locking each cam member against movement in said transverse direction when the cam face thereof is engaged by said cam follower means.
  • releasing means releasing said locking means when said cam member is not engaged by said cam follower means.
  • a common support carrying said cam members said first moving means including means for angularly moving said support about an axis remote from said cam track, said cam faces having respective first portions approximately circularly arcuate about said axis and respective second portions obliquely inclined relative to the associated first portions and transverse to each other, said second moving means including actuating means associated with each cam member for moving the associated cam member in integral, binary multiples of a unit step, said actuating means each including a plurality of actuating members series-connected in said transverse direction, and operating means for expanding and contracting each of said actuating members in said transverse direction in. response to said control signals.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Transmission Devices (AREA)
US106661A 1970-01-21 1971-01-15 Guide bar shogging mechanism for a warp knitting machine Expired - Lifetime US3678711A (en)

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Application Number Priority Date Filing Date Title
DE19702002568 DE2002568A1 (de) 1970-01-21 1970-01-21 Steuervorrichtung fuer Wirkmaschinen

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US3678711A true US3678711A (en) 1972-07-25

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DE (1) DE2002568A1 (enrdf_load_stackoverflow)
GB (1) GB1290281A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3802227A (en) * 1972-09-12 1974-04-09 Vykumny Ustov Pletarsky Apparatus for controlling the movement of a yarn guide bar
US4364244A (en) * 1979-08-31 1982-12-21 Edmundas Vambutas Memory controlled electromagnetic passive controllers
US5327750A (en) * 1991-01-24 1994-07-12 Textilma Ag Warp knitting machine, especially crochet galloon machine
US5390513A (en) * 1993-02-10 1995-02-21 Liba Maschinenfabrik Gmbh Warp knitting machine having a guide bar with individually movable thread guides mounted thereon
US5709108A (en) * 1994-10-19 1998-01-20 Nippon Mayer Co., Ltd. Auxiliary driving device and control method for patterning device in warp knitting machine
US6050111A (en) * 1997-02-26 2000-04-18 Nippon Mayer Co., Ltd. Guide drive device in warp knitting machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5636707A (en) * 1979-08-31 1981-04-10 Digital Interface Systems Corp Memory control electromagnetic passive actuator
GB8406466D0 (en) * 1984-03-13 1984-04-18 Guildford Kapwood Ltd Mechanism for effecting movement
GB9015204D0 (en) * 1990-07-10 1990-08-29 Bentley Group Ltd Circular knitting machines

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416933A (en) * 1945-03-14 1947-03-04 Cotton Ltd W Patterning mechanism
US3006170A (en) * 1958-07-17 1961-10-31 H & F Binch Inc Selective positioning system
US3089322A (en) * 1958-08-20 1963-05-14 Cotton Silk & Man Made Fibres Automatic machinery
US3456461A (en) * 1967-11-15 1969-07-22 Nahwirkmaschinenbau Malimo Kar Control device for the laying rail of a warp knitting machine
US3478543A (en) * 1967-12-27 1969-11-18 Bruno Faninger Variable stroke mechanism

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416933A (en) * 1945-03-14 1947-03-04 Cotton Ltd W Patterning mechanism
US3006170A (en) * 1958-07-17 1961-10-31 H & F Binch Inc Selective positioning system
US3089322A (en) * 1958-08-20 1963-05-14 Cotton Silk & Man Made Fibres Automatic machinery
US3456461A (en) * 1967-11-15 1969-07-22 Nahwirkmaschinenbau Malimo Kar Control device for the laying rail of a warp knitting machine
US3478543A (en) * 1967-12-27 1969-11-18 Bruno Faninger Variable stroke mechanism

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3802227A (en) * 1972-09-12 1974-04-09 Vykumny Ustov Pletarsky Apparatus for controlling the movement of a yarn guide bar
US4364244A (en) * 1979-08-31 1982-12-21 Edmundas Vambutas Memory controlled electromagnetic passive controllers
US5327750A (en) * 1991-01-24 1994-07-12 Textilma Ag Warp knitting machine, especially crochet galloon machine
US5390513A (en) * 1993-02-10 1995-02-21 Liba Maschinenfabrik Gmbh Warp knitting machine having a guide bar with individually movable thread guides mounted thereon
US5709108A (en) * 1994-10-19 1998-01-20 Nippon Mayer Co., Ltd. Auxiliary driving device and control method for patterning device in warp knitting machine
US6050111A (en) * 1997-02-26 2000-04-18 Nippon Mayer Co., Ltd. Guide drive device in warp knitting machine

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DE2002568A1 (de) 1971-08-05
GB1290281A (enrdf_load_stackoverflow) 1972-09-27

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