US3667256A - Means for guarding needle latches of circular knitting machines - Google Patents

Means for guarding needle latches of circular knitting machines Download PDF

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Publication number
US3667256A
US3667256A US30177A US3667256DA US3667256A US 3667256 A US3667256 A US 3667256A US 30177 A US30177 A US 30177A US 3667256D A US3667256D A US 3667256DA US 3667256 A US3667256 A US 3667256A
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US
United States
Prior art keywords
latch
yarn
slot
guard ring
latch guard
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
US30177A
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English (en)
Inventor
Keith Gerald Townsend
David Arthur Harlow
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.)
Bentley Engineering Co Ltd
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Bentley Engineering Co Ltd
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Filing date
Publication date
Application filed by Bentley Engineering Co Ltd filed Critical Bentley Engineering Co Ltd
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Publication of US3667256A publication Critical patent/US3667256A/en
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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
    • 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
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/10—Indicating, warning, or safety devices, e.g. stop motions

Definitions

  • the yarn is ordinarily fed from a feeder via a lower comer of the U-shaped slot on its way into the hooks of the needles and it has been found advantageous to make the bottom of the slot of a hard wearing metal or other material such as ceramic in the form of an insert which can easily be replaced.
  • the slots in the latch guard forrn recesses into which needle latches can swing when the needles are at certain heights, especially in the event of a press-off'"or in the case of any individual needles in the machine not actually knitting yarn. If a needle latch enters the slot it is very prone to be bent as it hits the far side thereof and considerable damage to the needles can well occur involving wasteful delay and replacement expense.
  • a latch guard which is devoid of feeder receiving slots but has at a feeding station a slot just wide enough for yarn to be fed through it (and for two yarns to pass at a yarn change), the width of the slot being insufficient to permit a needle latch to swing into it during operation of the knitting machine.
  • the latch guard is in the form of a ring which presents to the needles a cylindrical surface which is devoid of gaps capable of damaging needle latches during knitting at any level of the needles.
  • the needle latches are prevented from being caught up in gaps or recesses in the latch guard so that the aforementioned liability to damage of the latches is avoided.
  • the need for providing a gap closing member as aforementioned is avoided.
  • a latch guard ring which at the position of a yarn feeding station is formed with a narrow heightwise extending slot opening on to one of its edges to permit passage therethrough of a yarn on its way from a feeder to the needles.
  • the ring will be formed with such a slot at the position of each feeding station.
  • a latch guard ring may be provided with means for ensuring that a yarn or yarns passing through such a slot cannot escape therefrom.
  • Such means may consist of a ring encircling the latch guard ring at or near the mouth of the slot or slots as aforesaid therein, or may be provided by having the slot or slots closed at the upper end.
  • FIG. 1 is a plan view of the top of a single cylinder circular knitting machine such as is used for knitting hosiery footwear,
  • FIG. 2 is a detail elevation view in cross-section taken on the line II-II in FIG. 1, and
  • FIG. 3 is a fragmentary cross-sectional view of a modified latch guard ring.
  • FIG. 2 there is a circular series of needle 1 located in a needle cylinder 2, and rotatable with the cylinder past operating cams (not shown) to impart the various knitting movements which are well known and do not need to be described herein.
  • a latch guard in the form of a cylindrical ring 3 the surface of which is continuous around its lower edge adjacent to the sinkers shown at 4 in FIG. 2 but is slotted from its upper edge at locations 35 and 313 etc, in parts of the ring 3 that are externally and vertically recessed at 21 to form a thin wall part.
  • the slots 32 and 32 etc are only as wide as a normal feeder hole, i.e. of sufficient width to allow free passage of the yarn and to allow two yarns to pass one another.
  • the tops of the slots may be effectively closed by the use of a circumferential band 5 held in a groove 6around the outside of the latch guard ring.
  • Various forms of slot closure may be used; it is even possible to manufacture the latch ring with slots closed at both ends (as will be described later).
  • the latch guard ring 3 is bolted to a support plate 22 from which extend arms 22g and 22; supporting it from a spindle l2.
  • main feed feeders 7,8,9,10,l 1 At the outside of the latch guard ring are located the main feed feeders 7,8,9,10,l 1, all of which are pivoted on the spindle 12 and operated by links or cables from the main or auxiliary control drum as is conventional on such machines but not shown here.
  • a trapper located within the needle circle as shown in FIG. 1 at 13, 14,15,16 and 17, related respectively to the feeders 7,8, 9,10 and 11.
  • the yarns which are not being fed to needles at any one time pass through the feeders which are held in their high inactive position, through the slot 3 z in the latch ring 3 to the appropriate trapper, such as is shown in FIG. 2 by the position of feeder 10 and yarn 18. These inactive yarns are held from rising out of the top of slot 35 by the band 5.
  • the yarn or yarns which are being knitted by the needles are kept low in slot 35 to cause them to enter the hooks lg of the needles, as is shown in FIG. 2 by yarn 19 fed through the active feeder 9.
  • To change yarns being fed the conventional movements of feeders and trappers are carried out, each yarn passing through the guide slot 205 in plate 20 to its respective trapper and the feeders reversing their positions as needed.
  • edges of the slots such as 35 perform the same function of guiding the yarn as do the comers of a conventional throat plate. It is therefore necessary to make the latch guard ring of very hard metal or to fit ceramic inserts at the sides of the feeding slots to prevent wear.
  • a cylindrical latch guard ring 23 is supported at three positions spaced apart around its circumference by flanged nuts 25, screwed for adjustability on studs 26, and fitted with locking nuts 25g.
  • Flanges 24 of the nuts 25 engage in scalloped grooves 27 in the ring 23 to support the latter.
  • the studs 26 pass through holes formed in intumed lugs 28 of a latch ring 29 pivoted on a spindle corresponding to spindle 12.
  • Springs 30 on the studs 26 are in compression between the heads of the studs and the lugs 28 when the latch ring is lowered to and locked in its working position thereby holding the heads of the studs against the support plate 22 which may be the sinker cap.
  • the latch guard ring is formed with external and vertical recesses 31, like the recesses 21, and yarn receiving slots 32 corresponding to the slots 39, 32 etc of FIG. 1, but differing therefrom by being closed at both upper and lower ends as indicated at 329 and 3213. By having both ends of the slots 32 closed less weakening of the ring is caused by the slots.
  • latch guard ring in accordance with this invention which can be used if the design of the knitting machine so permits, is of the same form as in FIGS. 1 and 2 but made taller.
  • latch guard ring it is not necessary to restrict the height to which the yarns rise in the slot or to chamfer the top edges of the slot to guide the yarns into it, as the feeder levers are not able to lift the yarns near enough to the top of the slot to introduce any risk of them escaping from the slot What we claim is:
  • a latch guard ring of cylindrical form and mounting means therefor said latch guard ring being recessed vertically externally to reduce it to a thin wall part at a position corresponding to a knitting station and formed in said thin wall part with a narrow vert-yarn feeding slot just wide enough for a yarn to pass through it and for two yarns to pass one another vertically during a yarn change and narrow enough to prevent a needle latch from swinging into the slot during operation of the machine.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US30177A 1969-04-23 1970-04-20 Means for guarding needle latches of circular knitting machines Expired - Lifetime US3667256A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB20684/69A GB1268216A (en) 1969-04-23 1969-04-23 An improved means for guarding needle latches of circular knitting machines

Publications (1)

Publication Number Publication Date
US3667256A true US3667256A (en) 1972-06-06

Family

ID=10149956

Family Applications (1)

Application Number Title Priority Date Filing Date
US30177A Expired - Lifetime US3667256A (en) 1969-04-23 1970-04-20 Means for guarding needle latches of circular knitting machines

Country Status (6)

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US (1) US3667256A (en))
CS (1) CS153549B2 (en))
DE (1) DE2019525A1 (en))
ES (1) ES378994A1 (en))
FR (1) FR2046419A5 (en))
GB (1) GB1268216A (en))

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US456372A (en) * 1891-07-21 Circular-knitting machine
US621681A (en) * 1899-03-21 Knitting-machine
US670892A (en) * 1900-07-07 1901-03-26 Harry Clarke Circular-knitting machine.
US805670A (en) * 1901-11-26 1905-11-28 Jenckes Mfg Company E Knitting-machine.
US1509408A (en) * 1924-09-23 Island
US2757526A (en) * 1950-10-30 1956-08-07 H E Crawford Company Inc Knitting machine
GB1019160A (en) * 1963-06-11 1966-02-02 Elitex Zavody Textilniho Thread inserting device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US456372A (en) * 1891-07-21 Circular-knitting machine
US621681A (en) * 1899-03-21 Knitting-machine
US1509408A (en) * 1924-09-23 Island
US670892A (en) * 1900-07-07 1901-03-26 Harry Clarke Circular-knitting machine.
US805670A (en) * 1901-11-26 1905-11-28 Jenckes Mfg Company E Knitting-machine.
US2757526A (en) * 1950-10-30 1956-08-07 H E Crawford Company Inc Knitting machine
GB1019160A (en) * 1963-06-11 1966-02-02 Elitex Zavody Textilniho Thread inserting device

Also Published As

Publication number Publication date
FR2046419A5 (en)) 1971-03-05
GB1268216A (en) 1972-03-22
ES378994A1 (es) 1972-08-01
DE2019525A1 (de) 1970-12-17
CS153549B2 (en)) 1974-02-25

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