US3729955A - Straight bar knitting machines - Google Patents

Straight bar knitting machines Download PDF

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Publication number
US3729955A
US3729955A US00026028A US3729955DA US3729955A US 3729955 A US3729955 A US 3729955A US 00026028 A US00026028 A US 00026028A US 3729955D A US3729955D A US 3729955DA US 3729955 A US3729955 A US 3729955A
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United States
Prior art keywords
points
loop
needles
doublings
motions
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Expired - Lifetime
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US00026028A
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English (en)
Inventor
R Blood
C Strong
A Pearson
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William Cotton Ltd
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William Cotton Ltd
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Publication date
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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
    • D04B11/14—Straight-bar knitting machines with fixed needles with provision for changing the fabric construction, e.g. from plain to rib-loop fabric

Definitions

  • PATENTEDMAY 1 ma SHEET 03UF 17 .8008 u n u u n u u 0 PATENTE RAY ns 's saw um 1 oooooooooooooo PATENTEUHAY m 3.729355 SHEET OSUF 17 PATENTEW Y 3729.955
  • This invention is for improvements relating to the production of rib fabric in straight bar knitting machines, and is concerned with the production of knitted blanks for which the knitting of rib fabric, as for a rib border for a knitted garment, is to be followed by non-rib fabric being knitted onto the rib fabric.
  • the rib fabric It is usual for the rib fabric to have a greater number of wales than the non-rib fabric, and therefore it is usual for the last course of rib fabric to be subjected to an operation known as loop doubling in which, at each of a multiplicity of predetermined substantially equally spaced positions in the length of the course, a loop is doubled with the next adjacent loop, the frequency of the loop doubling along the course being governed by the difference in the number of wales in the rib and non-rib fabric and by customers requirements.
  • loop doubling in which, at each of a multiplicity of predetermined substantially equally spaced positions in the length of the course, a loop is doubled with the next adjacent loop, the frequency of the loop doubling along the course being governed by the difference in the number of wales in the rib and non-rib fabric and by customers requirements.
  • An object of the invention is to provide for loop doubling in such improved manner as not to be undesirably costly and yet enabling loop doubling to be effecting at any required frequency throughout the length of a last rib course of any possible length.
  • the invention provides a method of producing by a knitting machine, rib fabric having spaced loop doublings in its last-formed course to prepare it for non-rib fabric to be knitted onto the rib fabric, which method includes formingthe loop doublings by operating a pair of adjacent loop transfer point bars with single-needle type inward transfer motions alternating with plural-needle type outward re-set motions, changing when required the single-needle type transfer motions of the point bars to plural-needle type transfer motions, imparting to selvedge stops when required single-needle type and pluralneedle type inward adjustments, and setting up control means for controlling the operations of the point bars with reference to available information of at least different course lengths in terms of numbers of loops, different numbers of points in the point bars, different needle spacings between the point bars in their adjacent position, and different loop doubling frequencies, so that different arrangements of loop doublings can be formed to suit different requirements.
  • the method may include using the point bars each with a number of points equal to or greater than half the total mumber of loops in the course, forming the loop doublings by only the single-needle type transfer motions of the point bars, and imparting to the selvedge stops only the single-needle type adjustments.
  • the method may alternatively include using the point bars each with a number of points less than half the total number of loops in the course, forming a first fractional number of the loop doublings, including forming holes spaced from the loop doublings, by only the single-needle type transfer motions of the point bars, forming a second number of the loop doublings, including filling up the holes, by only plural-needle type transfer motions, and imparting to the selvedge stops the single-needle type adjustments when required and the plural-needle type adjustments when required.
  • the plural-needle type transfer motions and selvedge stop adjustments are of two-needle type, and a third number of the loop doublings, including filling up the holes, is formed by three-needle type transfer motions and selvedge stop adjustments.
  • the method may include re-adjusting the selvedge stops for selvedge fashioning, the re-adjustment being made with reference to available information of the number of points remaining in registry with selvedge groups of needles at the end of forming the loop doublings. Conveniently the available information is in the form of numerical charts the details of which have been obtained by use of formulae.
  • the method includes setting up the control means to provide for a number of single-needle transfer motions without selvedge stop adjustments, a number of the single-needle type transfer motions with single-needle type selvedge stop adjustments, a number of two-or-more-needle type transfer motions with two-or-more-needle type selvedge stop adjustments, and a two-or-more needle type transfer motion without a selvedge stop adjustment.
  • the invention also provides a straight bar knitting machine having means for producing rib fabric to be followed by knitting non-rib fabric onto the rib fabric, a narrowing head carrying a pair of loop transfer point bars each having a multiplicity of loop transfer points, means for changing the mode of the machine from knitting to fashioning, adjustable lead screw means for controlling the point bars to provide when required for single and plural-needle inward loop transfer motions alternating with plural-needle outward re-set motions of the point bars for loop doubling at spaced locations along the length of the course, selvedge stops adjusts ble to provide when required for single-and-plural-needle inward adjustments thereof, and pattern or programme control means which is variably pre-set with reference to course length in terms of loops in the course, number of points in the bars, number of needles between the bars in an innermost starting position, and frequency of loop doubling, so that loop doublings can be formed at any required frequency automatically.
  • the number of points in the bar is a calculated maximum or minimum number.
  • the adjustable lead screw means for the point bars to provide plural-needle outward re-set motions is under control of cam-operated ratchet means having pawl control plates which are adjustable to provide for the re-set movements of the point bars being to variable pluralneedle extents.
  • the machine includes punched chart programming control means for controlling machine operations including fashioning motions of the machine and having counting means under control of punched hole information from the chart for controlling the number of fashioning motions or loop doublings required prior to changing from single-needle transfer motions to plural-needle transfer motions and prior to single-and-plural-needle adjustments of the selvedge stops.
  • FIG. 1 is a perspective view of needles and rib fabric in a straight bar knitting machine, according to the invention.
  • FIG. 2 is a similar view to FIG. 1 showing transfer of rib loops to frame needles.
  • FIG. 3 is a similar view to FIGS. 1 and 2 showing all the fabric loops on frame needles.
  • FIG. 4 is a detail view of a first loop doubling stage.
  • FIG. 5 is a similar view to FIG. 4 showing a later loop doubling stage.
  • FIG. 6 is a similar view to FIG. 5 showing a further loop doubling operation.
  • FIG. 7 is a view showing diagrammatically all the loop doubling stages necessary to suit one set of requirements.
  • FIG. 8 is a similar view to FIG. 7 showing all the loop doubling stages necessary to suit modified requirements.
  • FIG. 9 is a cross sectional view of relevant parts of a straight bar knitting machine according to the invention.
  • FIG. 10 is a diagrammatic front view of part of the machine.
  • FIG. 11 is a detail view of part of FIG. 9.
  • FIG. 12 is a detail view of part of FIG. 10.
  • FIG. 13 is a detail view of part of FIG. 12.
  • FIGS. 14 to 17 are detail views of control plates of FIG. 12.
  • FIG. 18 is a diagrammatic illustration of first clawker mechanism of FIG. 12.
  • FIG. 19 is a similar view to FIG. 18 at a later stage.
  • FIG. 20 is a similar view to FIG. 18 of a second clawker mechanism of FIG. 12.
  • FIG. 21 is a similar view to FIG. 19 showing the second clawker mechanism at a later stage.
  • FIG. 22 is a further detail view of the first clawker mechanism.
  • FIG. 23 is a detail view of gearing of FIG. 12.
  • FIG. 24 is a diagrammatic illustration of part of the machine mechanism and associated electrical control means.
  • FIG. 25 is a detail view of a punched chart used in the mechanism of FIG. 24.
  • FIG. 26 is a diagrammatic view similar to FIG. 8 showing loop doubling stages to suit further modified requirements.
  • FIG. 27 is a similar view to FIG. 26 showing loop doubling stages to suit still further modified requirements.
  • this kind of machine has bearded frame needles 1 and spaced machine needles MN which in this instance are latch needles.
  • Rib fabric RB is knitted on the spaced machine needles MN and on spaced ones of the frame needles as shown.
  • Loop transfer mechanism comprising in this instance loop spreader elements LSE on the machine needles MN is provided.
  • the machine needle loops L of the last rib course are transferred, by advancing the machine needles MN as in FIG. 2 and raising the frame needles as shown, to the intervening frame needles which have been inactive during the rib knitting.
  • This forms a nonrib course on the frame needles 1, FIG. 3, onto which non-rib fabric is to be knitted, either in the same machine or in a plain knitting machine.
  • the machine is equipped with at least two loop transfer devices 2, 2a, FIG. 10, each having a group of loop transfer points 3 for fashioning purposes but which are modified as hereinafter fully described for loop doubling in the last course of the rib fabric.
  • the machine is further equipped with the usual narrowing head having a narrowing shaft N, FIG. 9, carrying the loop transfer devices 2, 2a including the usual mechanism including an adjustable lead screw FS FIG. 10 for effecting single needle loop transfer motions of the points and re-setting motions of the points, the latter involving modified mechanism as hereinafter fully described for the required loop doubling.
  • the machine is still further equipped with punched chart programming mechanism which may be a main punched chart programming mechanism, partly shown in FIG. 24, for controlling shaping of a garment and modified for control of the required loop doubling, or there may be a separate punched chart programming mechanism for controlling the loop doubling.
  • punched chart programming mechanism which may be a main punched chart programming mechanism, partly shown in FIG. 24, for controlling shaping of a garment and modified for control of the required loop doubling, or there may be a separate punched chart programming mechanism for controlling the loop doubling.
  • Each of the loop transfer devices 2, 20 may have either a predetermined variable number of points or a predetermined standard number of points, to be hereinafter more fully referred to, and the programming means for the loop doubling is adapted for causing the points 3 of each loop transfer device 2, 2a to have a predetermined number of single needle loop transfer motions and a predetermined number of plural needle reset motions to provide a plurality of loop doublings in the last rib course at any required given frequency, and if necessary also to impart to the points 3 a predetermined number of following two or more needle loop transfer motions and furthera predetermined number of plural needle reset motions to provide a further plurality of loop doublings substantially at the same given frequency, so that loop doublings can be formed at any required frequency in a series extending substantially throughout the whole length of the course.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
US00026028A 1969-04-16 1970-04-06 Straight bar knitting machines Expired - Lifetime US3729955A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1938769 1969-04-16

Publications (1)

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US3729955A true US3729955A (en) 1973-05-01

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Family Applications (1)

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US00026028A Expired - Lifetime US3729955A (en) 1969-04-16 1970-04-06 Straight bar knitting machines

Country Status (6)

Country Link
US (1) US3729955A (enrdf_load_stackoverflow)
JP (1) JPS512982B1 (enrdf_load_stackoverflow)
CH (1) CH516677A (enrdf_load_stackoverflow)
DE (1) DE2017886A1 (enrdf_load_stackoverflow)
FR (1) FR2039220A1 (enrdf_load_stackoverflow)
GB (1) GB1295853A (enrdf_load_stackoverflow)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3050967A (en) * 1956-11-20 1962-08-28 Cotton Ltd W Production of garments on straight bar knitting machines
US3141316A (en) * 1959-07-07 1964-07-21 William Cotron Ltd Pattern control mechanisms
US3376717A (en) * 1964-07-28 1968-04-09 Scheller Textilmaschinenfabrik Connection between plain and ribbed fabrics
US3435638A (en) * 1965-09-23 1969-04-01 Cotton Ltd W Straight-bar knitting machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3050967A (en) * 1956-11-20 1962-08-28 Cotton Ltd W Production of garments on straight bar knitting machines
US3141316A (en) * 1959-07-07 1964-07-21 William Cotron Ltd Pattern control mechanisms
US3376717A (en) * 1964-07-28 1968-04-09 Scheller Textilmaschinenfabrik Connection between plain and ribbed fabrics
US3435638A (en) * 1965-09-23 1969-04-01 Cotton Ltd W Straight-bar knitting machines

Also Published As

Publication number Publication date
JPS512982B1 (enrdf_load_stackoverflow) 1976-01-30
DE2017886A1 (enrdf_load_stackoverflow) 1970-11-05
FR2039220A1 (enrdf_load_stackoverflow) 1971-01-15
CH516677A (fr) 1971-12-15
GB1295853A (enrdf_load_stackoverflow) 1972-11-08

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