US3129572A - Latch opener mechanism for knitting machines - Google Patents

Latch opener mechanism for knitting machines Download PDF

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Publication number
US3129572A
US3129572A US214077A US21407762A US3129572A US 3129572 A US3129572 A US 3129572A US 214077 A US214077 A US 214077A US 21407762 A US21407762 A US 21407762A US 3129572 A US3129572 A US 3129572A
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US
United States
Prior art keywords
latch
bar
needles
needle
hook
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.)
Expired - Lifetime
Application number
US214077A
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English (en)
Inventor
Harry O 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.)
Wildman Jacquard Co
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Wildman Jacquard Co
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Filing date
Publication date
Application filed by Wildman Jacquard Co filed Critical Wildman Jacquard Co
Priority to US214077A priority Critical patent/US3129572A/en
Priority to GB29489/63A priority patent/GB980019A/en
Priority to DE1585490A priority patent/DE1585490C3/de
Application granted granted Critical
Publication of US3129572A publication Critical patent/US3129572A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B11/00—Straight-bar knitting machines with fixed needles
    • D04B11/04—Straight-bar knitting machines with fixed needles with two sets of needles
    • 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
    • D04B15/08—Needle latch openers; Brushes
    • 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
    • D04B15/28—Needle pressers

Definitions

  • latch opener hooks which are formed and disposed in such a manner that they also serve as a guard means to prevent stitch loops that are being pulled down off the noses of the sinkers into the hook portion of the latch needles from becoming displaced, such, for example, as getting in back and under the latches where they would be cast off the needles.
  • This type of straight bar knitting machine utilizes two needle bars, a first needle bar preferably including spring beard needles and a second needle bar preferably including latch needles.
  • the latch needle bar is cam controlled and to form rib fabric it is advanced to a position which places the latch needles in close proximity to the spring beard needles with which they are caused to function as disclosed in the above-mentioned application. After the completion of the rib section the latch needle bar by this cam means is automatically withdrawn to an inactive position and the spring beard needles continue to knit by themselves producing jersey fabric in continuation of said rib section.
  • the mechanism includes a latch hook bar which overlies the latch needle bar. It is provided with a plurality of inwardly directed latch hooks disposed along the length thereof and equivalent in number to the number of latch needles carried by the latch needle 3,129,572 Patented Apr. 21, 1964 bar.
  • the mechanism is cam controlled and is caused to function in timed relationship with the cam means utilized to control the movement of the latch needle bar.
  • the hook bar is then caused to move forwardly with respect to the knitting machine itself and at a slight incline to the horizontal causing the latch hooks to pull all of the needle latches open simultaneously.
  • the latch hooks are then caused to dwell in a position which keeps them in contact with the open needle latches to prevent said latches from closing before the hooked portion of the needle has had an opportunity to take yarn.
  • the outer surface of the latch hooks serve as guards to prevent loops that are being pulled down off the sinker noses from becoming displaced such, for example, as getting in back of and under the latches where they would be cast off resulting in drop stitches and fabric of an inferior quality.
  • FIG. 1 is a section taken through a part of a fashioning type straight bar knitting machine to which the invention has been applied;
  • FIG. 2 is a sectional view through the knitting heads showing a needle latch being held open by a latch hook while measuring a stitch around a sinker and spring beard needle;
  • FIG. 3 is a view similar to that of FIG. 2 but showing the latch hook in dwelling position where it is caused to hold the needle latch open and act as a guard means to prevent displacement of a yarn loop being pulled off the nose of the sinker;
  • FIG. 4 is a view similar to that of FIG. 2 but showing the position the latch hooks are caused to assume prior to the opening of the latches and by means of the directional arrows, the direction is indicated which the latch needles and hooks must move to effect the opening of said latches;
  • FIG. 5 is a plan view of the linkage utilized to control the required movement of the latch needle bar and the latch hook bar;
  • FIG. 6 is a view in side elevation and on an enlarged scale showing the relationship between the latch hook and the needle prior to the opening of the needle latch;
  • FlG. 7 is an end view of the hook and needle shown in FIG. 6 illustrating one form of hook end that may be utilized to effect opening of the needle latches;
  • PEG. 8 is a view similar to that of FIG. 7 but showing a modified form of hook end which may be used;
  • FIG. 9 is a front elevational view of part of the knitting machine looking in the direction of the indicating arrow 9 in FIG. 1, showing the cams and linkages utilized to control movement of the latch needle bar and the latch hook bar;
  • FIG. 10 is a view similar to that of FIG. 4 but showing a portion of the fabric F, the direction it is caused to move as formed and the position of a yarn loop under the nose of a sinker;
  • FIG. 11 is a view similar to FIG. 1 but showing only the means for controlling the movement of the latch hook bar and for lifting the latch needle bar;
  • FIG. 12 is a view similar to FIG. 1 but showing only the means for controlling the horizontal movement of the latch needle bar and catch bar.
  • FIG. 1 illustrates that part of a knitting machine to which the instant invention has been applied and includes among other parts a main needle bar 21) which includes a plurality of spring beard needles 21 that assemble along the length thereof and extend upwardly therefrom.
  • a plurality of knock-over bits 22 are carried in a known manner by a bar 23 and the usual sinkers 24 are utilized in a sinker head base 25.
  • a rib needle bed or latch needle bar 26 is located forward of and at right angles to the main needle bar 29.
  • the various parts which comprise the mechanism of the instant invention derive their means of motion from the cams indicated generally by numeral 27 mounted on the knitting machines auxiliary cam shaft 23.
  • the latch needle bar 26 is slotted as at 29 in FIG. and forms a bed therein for slidable latch needles 31 which are adapted to operate at right angles and in conjunction with the spring beard needles 21 when forming rib fabric.
  • the latch needles are caused to move to and from their operating position simultaneously by means of a catch bar 32 which is provided with a slot 33 that is adapted to fit over the butts 34 of said latch needles (FIGS. 2 to 4).
  • the latch needle bar 26 is provided with key members 35 and 35' on each end thereof, FIG. 9, which are adapted to fit into slots, one of which is shown at 36 in FIGS. 11 and 12, formed in the latch needle bar guides 37 and 37'.
  • This needle bar is slidable horizontally in guides 37 and 37 by means of connecting links 38 and 38' the inner ends of which are pivotally attached to integrally formed lug members 39 and 39' which are centrally disposed with respect to the width of the needle bar and protrude downwardly from the underside of said needle bar and adjacent the ends thereof.
  • the forward ends of the connecting links 38 and 38 are attached in a similar manner to the upper bifurcated end of upwardly directed arcuated bell crank lever arms 40 and 40.
  • the hub portions 41 and 41' of these bell crank levers are rockable on a fixed horizontal shaft 42 and are provided with forwardly directed and substantially horizontal arcuated second arms 43 and 43 (FIGS. 9 and 12).
  • These second arms are provided intermediate their ends with rollers or cam followers 44 and 44 which are adapted to bear against cams 45 and 45 by means of a spring 46 (left-hand only shown, FIG. 12) one end of which is attached to the end of said second arm and the opposite end at some suitable point on the lower portion of the knitting machine itself.
  • FIG. 9 of the drawing is a front elevational view showing many of the right-hand parts which correspond to the left-hand, and because of their similarity they are being given the same number as the left-hand parts but with the addition of a prime.
  • cams 45 and 45' Rotation of cams 45 and 45' causes the cam followers 44- and 44' to follow the dictates of said cams thus rocking the bell crank lever arms 40 and ill back and forth sliding the needle bar in a like manner in timed relationship with the catch bar 32 and the latch opener mechanism, both of which will be more fully explained hereinafter.
  • the catch bar 32 which overlies the needles and which is adapted to control the movement of the latch needles 31 carried by the needle bar 26 is provided on each end thereof with a catch bar bracket 46 (left-hand only shown, FIGS. 1, 11 and 12) having a forwardly extending lug portion 47 which is adapted to receive pivotally one end of a catch bar connecting link 48.
  • the right-hand side of the machine being of similar construction utilizes the same type of connecting link 48 and the forward ends of both are pivotally attached to the upper ends 49 and 49 of double armed levers generally indicated by numerals 50 and 50, respectively.
  • the hub portions of these levers assemble on shaft 42 and are rockable thereon. They are provided with second arms 51 and 51. which extend in a 2?.
  • rollers or cam followers 52 and 52' which are caused to follow the outer periphery of rotating cams 53 and 53'.
  • the dictates of these cams cause the upper arms 49 and 49 to move back and forth and being pivotally connected to the catch bar through the connecting links 48 and 48', said catch bar is caused to slide back and forth in timed relation with the knitting cycle to advance and remove the latch needles 31 to and from their operating position.
  • the latch needle bar is capable of being raised for the purpose of bringing the latch needles up under and through the sinkers to assist in equalizing the stitches in the same manner as the spring beard needles cast oif their stitches against the knock-over bits.
  • This motion is accomplished by means of needle bar lifter links 54 and 54'. These links have their upper ends pivotally attached to the inner lower side of the latch needle bar guides 37 and 37 and their lower ends are attached in a like manner to rearwardly directed first arms of bell crank levers which are assembled and rockable on shaft 42.
  • the drawing illustrates only the le t-hand bell crank lever (FIG. 11) and is generally indicated by numeral 55.
  • the first arm of this lever is represented by numeral 56.
  • the entire auxiliary shaft 28, together with the cams fixed thereupon is caused to move to the left or to the right to position each of the rollers in contact with a different cam by a known type of shifting mechanism.
  • the rib knitting mechanisms may be rendered inactive when knitting plain fabric.
  • the mechanism comprising the invention and which is caused to function in timed relationship with the aforementioned motions, includes a latch hook bar 61 positioned directly above the latch needle bar 26.
  • the hook bar being of approximately the same length as the needle bar includes a plurality of latch opener hooks 62 equal in number to the number of latch needles carried by said needle bar. These hooks extend inwardly from the hook bar and are firmly positioned along the length thereof by means of a hook bar cap 63 which overlies the hook members and is firmly attached to the top inner surface of said hook bar.
  • the tips of the latch opener books 62 may be formed to any desired shape such as tip 62' in FIG. 7 which is generally concaved enabling the sides thereof to extend below the outer surface of the hook portion of the needle 31, thus permitting said sides to assume a position below the inner end of the latch 31'.
  • a modified form of a latch opener hook tip 62" is shown in FIG. 8 and being of the chisel type, it is adapted to contact the outermost surface of the hook portion of the needle to effect opening of the latch 31' when making contact therewith.
  • the latch hook bar is provided on each end thereof with hook bar brackets indicated generally by numerals 64 and 64'.
  • the body portion 65 of these brackets is substantially L-shaped with the lower inwardly directed portion serving as a base or seat for the latch hook bar 61, and the upwardly directed portion is provided with an adjustment screw 66 the tip of which is adapted to bear against said hook bar 61, thus permitting fine fore and aft adjustment of the latter.
  • the hook bar brackets 64 and 64' are provided with forwardly directed and integrally formed extensions which terminate in the form of hubs 67 and 67'.
  • cams 75 and 75' cause the arcuated first arms 69 and 69 of these bell crank levers to rock back and forth and the hook bar brackets 64 and 64', being pivotally attached to the upper ends thereof, cause the latch opener hooks and hook bar to move inwardly and outwardly in timed relationship with the aforementioned mechanisms to open the latches of the latch needles at the required time during the knitting cycle.
  • the underside of the latch hook bar 61 is provided with adjustment screws 76 on each end thereof. The head portions of these screws are caused to bear against the top of the catch bar 32 and serve as a means for controlling the height of the latch opener hooks.
  • the horizontal bar of latch needles is caused to function in combination with the bar of vertical spring beard needles.
  • the spring beard needles are active and the latch needles are inactive.
  • the latch needle bar by the cam means heretofore described Prior to the knitting of rib the latch needle bar by the cam means heretofore described is caused to move inwardly toward its operating position. Before reaching this point, however, the hook portions of the latch needles are contacted by the tips 62 of the latch opener hooks which have also been moving inwardly in unison with the hook bar by the cam means herein described.
  • the latch opener hooks being controlled by cam means, are adapted to hold the needle latches in the open position during the stitch measuring cycle to prevent possible closing of the latches due to machine vibration, etc. Additionally, these hooks, when holding the latches open, serve as a guard means to prevent the yarn loops from becoming displaced such as getting in back of and under latches where they would be cast off before completing the function of a stitch.
  • a needle latch opener mechanism for flat knitting machines having a bar of latch needles adapted to knit rib fabric in combination with a bar of spring beard needles, a latch hook bar having in combination a plurality of latch opener hooks protruding from one side of said hook bar and equally spaced along the length thereof, a cam means for automatically moving said hook members into contact with said latch needles and for opening all the latches of said needles simultaneously.
  • a fiat knitting machine having in combination two needle bars, the first bar having spring beard needles assembled therein and the second bar having latch needles attached thereto, a first cam means for moving all of said latch needles into a position for knitting rib fabric in combination with said spring beard needles and for withdrawing all of said latch needles at the completion of said rib permitting said spring beard needles to knit jersey fabric in continuation thereof, a latch hook bar having a plurality of latch opener hooks extending therefrom, a second cam means adapted to function in timed relation to said first cam means for placing said latch opener hooks into contact with the latches of said latch needles and for opening all of the same simultaneously.
  • a needle latch opener mechanism for flat knitting machines having a bar of latch needles adapted to knit rib fabric in combination with a bar of spring beard needles, a latch hook bar having in combination a plurality of latch opener hooks protruding from one side of said hook bar and equally spaced along the length thereof, a cam means for automatically moving said hook members into contact with said latch needles and for opening all the latches of said needles simultaneously, said hook bar and latch opener hooks being angularly disposed with respect to said bar of latch needles to facilitate the opening of said latches.
  • a needle latch opener mechanism for flat knitting machines having a bar of latch needles adapted to knit rib fabric in combination with a bar of spring beard needles, a latch hook bar having in combination a plurality of latch opener hooks protruding from one side of said hook bar and equally spaced along the length thereof, a cam means for automatically moving said hook members into contact with said latch needles and for opening all the latches of said needles simultaneously, said latch opener hooks being fixedly positioned in said latch hook bar.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US214077A 1962-08-01 1962-08-01 Latch opener mechanism for knitting machines Expired - Lifetime US3129572A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US214077A US3129572A (en) 1962-08-01 1962-08-01 Latch opener mechanism for knitting machines
GB29489/63A GB980019A (en) 1962-08-01 1963-07-25 Straight bar knitting machine
DE1585490A DE1585490C3 (de) 1962-08-01 1963-07-29 Flache Ränderwirkmaschine System Cotton

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US214077A US3129572A (en) 1962-08-01 1962-08-01 Latch opener mechanism for knitting machines

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US3129572A true US3129572A (en) 1964-04-21

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Application Number Title Priority Date Filing Date
US214077A Expired - Lifetime US3129572A (en) 1962-08-01 1962-08-01 Latch opener mechanism for knitting machines

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US (1) US3129572A (de)
DE (1) DE1585490C3 (de)
GB (1) GB980019A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3377822A (en) * 1964-10-21 1968-04-16 Cotton Ltd W Straight bar knitting machines
US3397555A (en) * 1964-08-20 1968-08-20 Cotton Ltd W Machine latch guard
US4161109A (en) * 1977-09-15 1979-07-17 William Cotton Limited Latchguards
WO2003093548A1 (es) * 2002-05-06 2003-11-13 Jumberca, S.A. Abrelengüetas para máquina de genero de punto

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE84802C (de) *
US110479A (en) * 1870-12-27 Improvement in knitting-machines
GB189625046A (en) * 1896-11-09 1897-08-14 Joseph Herbert Improvements in and Applicable to Latch Needle Knitting Machines.
GB189925582A (en) * 1899-12-27 1900-01-27 Richard Arnold Improvements in or relating to Needle Openers for Knitting and like Machines.
US3008314A (en) * 1957-08-10 1961-11-14 Karl Mayer Erste Hessische Wir Raschel knitting machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE84802C (de) *
US110479A (en) * 1870-12-27 Improvement in knitting-machines
GB189625046A (en) * 1896-11-09 1897-08-14 Joseph Herbert Improvements in and Applicable to Latch Needle Knitting Machines.
GB189925582A (en) * 1899-12-27 1900-01-27 Richard Arnold Improvements in or relating to Needle Openers for Knitting and like Machines.
US3008314A (en) * 1957-08-10 1961-11-14 Karl Mayer Erste Hessische Wir Raschel knitting machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397555A (en) * 1964-08-20 1968-08-20 Cotton Ltd W Machine latch guard
US3377822A (en) * 1964-10-21 1968-04-16 Cotton Ltd W Straight bar knitting machines
DE1585516B1 (de) * 1964-10-21 1970-09-24 Cotton Ltd W Flache Raenderwirkmaschine,System Cotton,mit Zungennadeln als Maschinennadeln und mit Zungenoeffnern
US4161109A (en) * 1977-09-15 1979-07-17 William Cotton Limited Latchguards
WO2003093548A1 (es) * 2002-05-06 2003-11-13 Jumberca, S.A. Abrelengüetas para máquina de genero de punto
ES2211281A1 (es) * 2002-05-06 2004-07-01 Gumatex, S.L. Abrelenguetas para maquina de genero de punto.

Also Published As

Publication number Publication date
DE1585490A1 (de) 1969-11-27
GB980019A (en) 1965-01-13
DE1585490C3 (de) 1974-02-14
DE1585490B2 (de) 1973-07-19

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