US3635052A - Device for tensioning the thread on a textile machine - Google Patents

Device for tensioning the thread on a textile machine Download PDF

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Publication number
US3635052A
US3635052A US25686A US3635052DA US3635052A US 3635052 A US3635052 A US 3635052A US 25686 A US25686 A US 25686A US 3635052D A US3635052D A US 3635052DA US 3635052 A US3635052 A US 3635052A
Authority
US
United States
Prior art keywords
thread
pulley
brake
magnet
control means
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
US25686A
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English (en)
Inventor
Michel Monney
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.)
PLASMECA JEAN PIEMONTESI and CIE
Original Assignee
PLASMECA JEAN PIEMONTESI and CIE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by PLASMECA JEAN PIEMONTESI and CIE filed Critical PLASMECA JEAN PIEMONTESI and CIE
Application granted granted Critical
Publication of US3635052A publication Critical patent/US3635052A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • B65H59/16—Braked elements rotated by material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2555/00—Actuating means
    • B65H2555/10—Actuating means linear
    • B65H2555/13—Actuating means linear magnetic, e.g. induction motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • ABSTRACT A device for tensioning the thread on a textile machine, which comprises a retaining pulley rotatable by a pulled thread, and a brake for braking rotation of the pulley to give a preliminary tension to the thread downstream of the pulley.
  • the brake comprises control means adapted automatically to modify the opposing force exerted on the pulley for modifying the preliminary tension of the thread during specific stages of the process of working the thread on the machine.
  • This invention relates to a method of and device for tensioning thread on a textile machine, more particularly on a knitting machine.
  • An object of the invention is to provide an improved tensioning device.
  • a device for tensioning the thread on a textile machine which comprises a retaining pulley rotatable by a pulled thread, and a brake for braking rotation of the pulley to give a preliminary tension to the thread downstream of the pulley, the brake comprising control means adapted automatically to modify the opposing force exerted on the pulley for modifying the preliminary tension of the thread during specific stages of the process of working the thread on the machine.
  • the invention also provides a method of tensioning the thread on a textile machine, which comprises rotating a retaining pulley with a pulled thread, and braking rotation of the pulley to give a preliminary tension to the thread downstream of the pulley, the brake comprising control means adapted automatically to modify the opposing force exerted on the pulley for modifying the preliminary tension of the thread during specific stages of the process of working the thread on the machine.
  • the device illustrated is intended for tensioning a thread T on a textile machine and comprises a retaining pulley l rotatable by the thread T bearing against a groove 2 of the pulley, the base of which is lined with rubber at 3.
  • the thread T coming from a bobbin bears on the pulley 1 over an angle of approximately 90 before reaching a thread guide illustrated diagrammatically at 4, from which it is fed to a working station of the machine where, for example, it is knitted.
  • the pulley l is mounted on a shaft 6 borne by a support 7 fixed on a frame 8 of the machine. It cooperates with a brake described hereinafter, which brakes the rotation of the pulley 1 to give a predetermined tension to the thread in a part T1 (not shown) situated downstream of the pulley.
  • the brake comprises a mild steel plate 9 rigidly secured to the pulley l and a magnet 10 borne by the shaft 6.
  • the magnet 10 comprises a core 11 of nonmagnetic material (for example a plastics material), accommodating six magnetic members 12 hearing against a steel ring 13 accommodated in a rear hollow of the core E1.
  • the magnet 10 When the brake is engaged, the magnet 10 occupies the raised position shown in the right-hand part of the device as shown, and, in this position, there is just a small air gap 14 between the plate 9 and the end face of the magnetic members 112. When the plate rotates, eddy currents are induced in the plate 9 so that the magnet 10 exerts a braking action on the pulley 1, such action increasing as the airgap 14 decreases.
  • the magnet 10 is mounted slidably on the shaft 6 and a spring 15 disposed between a shoulder of the ring 13 and the end of a bush 16 screwed on the shaft 6 tends to hold it in the top position bearing against an abutment consisting of a resilient ring 17 disposed in a groove in the bush 16.
  • the axial position of the bush 16 along the shaft 6 and thus the width of the minimum airgap 14 can be adjusted by rotating the bush 16 on the shaft 6.
  • the bush 16 has a graduation 16a which moves with respect to a reference mark 19a provided on a fixed ring 19 screwed on the shaft 6.
  • the support 7 is clamped between this fixed ring 19 and a nut 21 also screwed on the shaft 6.
  • the shaft 6 is fon'ned with an axial duct 22 containing a block 23 having two radial arms 24 passing through a diametric slot 25 in the shaft and the ends of which engage in two diametrically opposite notches 26 of the core 11 which is thus prevented from turning on the shaft 6.
  • the block 23 is secured to one of the ends of a cable 27 passing through the duct 22, the other end being attached, by an adjustable stop device shown at 28, to the end of an actuating lever 2'9.
  • the lever 29 pivoted at 30 on a support 31 rigidly secured to the machine frame 8 bears a roller 32 cooperating with a cam 33 provided on a control shaft 34.
  • the shaft 34 also controls the progress of the stages in the process of working the thread as carried out by the machine.
  • the block 23 can occupy its top position shown in respect of its right-hand half so that the magnet 10 urged by the spring 15 is in its forward position determined by the adjustable stop 17 and exerts it maximum braking action.
  • the roller 32 cooperates with a part 38 of the cam at an intermediate level, the block 23 can then partially move upwards, the brake reoperating and initially exerting only a small opposing force on the pulley.
  • the control of the braking process to a given program enables the thread tension to be greatly increased, and this is very advantageous with very resilient or elastic threads. Firstly, more compact and stronger zones may then be obtained in fabrics, while secondly the consumption of resilient or elastic thread, which is generally expensive, may be vary substantially reduced.
  • the device hereinbefore described may readily be incorporated. in existing textile machines having a cam shaft.
  • the connection between the brake and the cam may be of any type, more particularly by means of a sheathed cable, when a rigid or more direct control is impossible.
  • the brake could be of some other type, for example, electromagnetic or hydraulic with a friction lining.
  • a device for tensioning the thread on a textile machine which comprises a retaining pulley rotatable by a pulled thread, and a brake for braking rotation of the pulley to give a preliminary tension to the thread downstream of the pulley
  • the brake comprising control means adapted automatically to modify the opposing force exerted on the pulley for modifying the preliminary tension of the thread during specific stages of the process of working the thread on the machine, the control means are adapted to render the brake instantaneously inoperative, so that the retaining pulley is the loose on its shaft, an electrical induction brake formed by a magnet and a plate which are rotatable relatively to one another on rotation of the retaining pulley, the control means being adapted to move the magnet and the plate apart from one another in order to reduce the opposing force.
  • a device wherein the plate is rigidly secured to the retaining pulley and the magnet disposed opposite the plate is mounted movably on a support.
  • a device wherein the support comprises a stop against which the magnet may bear in the advanced position, and resilient means tending to hold it against said stop, the control means being adapted to withdraw the magnet against the action of the said resilient means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US25686A 1969-04-19 1970-04-06 Device for tensioning the thread on a textile machine Expired - Lifetime US3635052A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH602569A CH515362A (fr) 1969-04-19 1969-04-19 Dispositif de mise en tension du fil sur une machine textile, notamment sur une machine à tricoter

Publications (1)

Publication Number Publication Date
US3635052A true US3635052A (en) 1972-01-18

Family

ID=4302992

Family Applications (1)

Application Number Title Priority Date Filing Date
US25686A Expired - Lifetime US3635052A (en) 1969-04-19 1970-04-06 Device for tensioning the thread on a textile machine

Country Status (6)

Country Link
US (1) US3635052A (fr)
AU (1) AU1372570A (fr)
CH (1) CH515362A (fr)
DE (1) DE2016263A1 (fr)
FR (1) FR2039294A1 (fr)
GB (1) GB1296445A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878697A (en) * 1972-03-28 1975-04-22 Masami Tsunekawa Production of bulky and stretchable knitted cord
US5943851A (en) * 1996-04-18 1999-08-31 Icbt Valence Yarn tensioning device and textile machine equipped therewith
US20070057108A1 (en) * 2005-09-13 2007-03-15 Brown Maurice H Adjustment mechanism for a wire tensioning apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519882A (en) * 1948-04-30 1950-08-22 Gen Electric Constant torque device
US2912185A (en) * 1957-04-11 1959-11-10 Stop Motion Devices Corp Adjustable tension regulator for yarn
US3263454A (en) * 1966-08-02 Method and apparatus for knitting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263454A (en) * 1966-08-02 Method and apparatus for knitting
US2519882A (en) * 1948-04-30 1950-08-22 Gen Electric Constant torque device
US2912185A (en) * 1957-04-11 1959-11-10 Stop Motion Devices Corp Adjustable tension regulator for yarn

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878697A (en) * 1972-03-28 1975-04-22 Masami Tsunekawa Production of bulky and stretchable knitted cord
US5943851A (en) * 1996-04-18 1999-08-31 Icbt Valence Yarn tensioning device and textile machine equipped therewith
US20070057108A1 (en) * 2005-09-13 2007-03-15 Brown Maurice H Adjustment mechanism for a wire tensioning apparatus
US7467759B2 (en) * 2005-09-13 2008-12-23 Brown Maurice H Adjustment mechanism for a wire tensioning apparatus

Also Published As

Publication number Publication date
GB1296445A (fr) 1972-11-15
FR2039294A1 (fr) 1971-01-15
AU1372570A (en) 1971-10-14
DE2016263A1 (de) 1970-10-22
CH515362A (fr) 1971-11-15

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