US3676990A - Thread-sensing device for a textile machine - Google Patents

Thread-sensing device for a textile machine Download PDF

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Publication number
US3676990A
US3676990A US32635A US3676990DA US3676990A US 3676990 A US3676990 A US 3676990A US 32635 A US32635 A US 32635A US 3676990D A US3676990D A US 3676990DA US 3676990 A US3676990 A US 3676990A
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US
United States
Prior art keywords
latch
thread
sensing device
magnet
sensor
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
US32635A
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English (en)
Inventor
Fernand Santerre
Francis Libaud
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.)
Telemecanique SA
Original Assignee
La Telemecanique Electrique SA
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 La Telemecanique Electrique SA filed Critical La Telemecanique Electrique SA
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Publication of US3676990A publication Critical patent/US3676990A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
    • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
    • B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
    • 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

  • the present invention relates to a thread-sensing device for a textile machine.
  • a number of thread-sensing devices are' known. They are usually constituted by a sensor which is held in its working position by the stretched thread and which swings into a warning position in the event of breakage of the thread or of a reduction in the tension thereof. Certain movable sensors comprise permanent magnets which, when the device is in the warning position act on contacts in sealed capsules. Other swinging sensors are provided with cams which, upon rotation, close contacts held open by a resilient force.
  • a thread-sensing device comprising a thread sensor held in position by the taut thread, a pair of electrical contacts biased towards a closed position but which are normally held in the open position by a latch comprising ferromagnetic material, and a permanent magnet located in proximity to the latch and movable by movement of the' thread sensor upon thread breakage into a position in which the magnetic force exerted by the magnet on the latch is sufficient to move the latter to allow the contacts to close.
  • the magnet and the sensor are connected together for common angular movement about a pivotal axis.
  • the permanent magnet is rectilinear and by one of its ends acts on the latch, while in the field of attraction of the other of its ends there'is disposed a ferromagnetic mass the position of which is adjustable.
  • the swinging of the equipment can be completely independent of weight and can be effected by a tractive force acting between the magnet and the ferromagnetic mass.
  • a tractive force acting between the magnet and the ferromagnetic mass By displacing the latter, it is possible to adjust the reluctance of the magnetic circuit, so that this attraction provides a relatively reduced return force on the sensor of the swinging unit when the latter is in the working position, whereas, with the attraction varying in inverse proportion to the square of the distance between the magnet and the ferromagnetic mass, this attraction increases very rapidly when the swinging action is started, so that the magnet very quickly reaches the position in which it can act upon the latch to release it and to cause the electric contact to be closed.
  • FIG. 1 is a plan view of a thread-sensing device in accordance with the invention.
  • FIG. 2 is a section on line ll-ll of FIG. 1.
  • FIGS. 3 and 4 are sections on lines llllll and lVlV respectively of HO. 2.
  • the thread-sensing device illustrated in these figures is contained in a case formed from two halves l, which are fitted and held together by means of screws 2.
  • the thread 3 to be monitored passes through thread-guides 4 which are encased in the upper part of the unit when the two parts of the case are fitted together.
  • the moving part of the equipment swings about a pivot pin 5. It is constituted by a moulded support 6 which carries a permanent magnet 7 and a sensing arm 8 shown in solid lines in its working position and in dash-dot lines in the swung position, as is the rest of the equipment.
  • the sensor 8 is constituted by a suitably bent metal wire which carries at its end a roller 9 which is in contact with the textile thread to be monitored.
  • the latch is constituted by a mild steel vane 10 mounted in a support 11 having journals 12 to enable it to pivot in bearings formed in the two opposite halves of the case 1.
  • the contact device comprises a fixed contact 13 constituted by a blade which is embedded between the two halves of the case and which carries a contact piece 14 at one end and a connector 15 at the other.
  • the moving contact is also constituted by a blade 16, bent to U-shape, which likewise terminates in a connector 15 at one end, and the other free end of which, terminating in an inclined portion 17, carries the moving contact piece 18.
  • the moving contact piece is urged towards the fixed contact piece 13 by a spring 19.
  • the vane 10 keeps the two contact pieces apart by bearing on a nose 17a at the end of the inclined portion 17.
  • the vane 10 can be brought into this position by the action of a plunger 20 which slides in one of the two halves of the case and which comprises two branches, one of which, 20a, is directed towards the central portion of the case so as to act on the vane 10, while the other, 20b, is acted upon by a return spring 21 to bring the plunger into the upper position.
  • a second latch or bolt, 22, accommodated in opposite grooves 23 in the two halves of the case, can slide between these two halves and below the thread 3, and includes a cross-member 24 which, when brought into the position 24a, holds the sensor 8-9 in the pressed-down position, that is to say, in the position wherein the magnet 7 is at a distance from the vane 10. The system is then non-active.
  • the size of the contacts is such that they can pass a current sufficient to actuate warning means or thread cutters directly.
  • the sensor 8 is brought to the position shown in solid lines and is held in this position by the bolt 22 in position 22A when the thread 3 is again pulled taut. Then, pressure applied to the plunger 20 hooks the vane 10 on to the nose 17a again. The thread 3 can then be replaced in position and, when it is again stretched, the equipment can be brought into operation by moving the bolt from position 22A, shown in dash-dot lines, to the posi- 1 tion 22 shown in solid lines.
  • the restoring force acting on the swinging part of the equipment depends upon the position of the pole-piece 27 relative to the magnet 7. This position can be adjusted by turning the screw 26.
  • the time taken by the equipment to respond when a thread breaks can be adjusted; obviously, the shorter the distance between the magnet 7 and the pole-piece 27 in normal service, the more this time is reduced. Nevertheless, if the distance becomes too small, a return couple would be applied to the swinging part of the equipment and this could be too great to be balanced by the pull on the thread 3 between the threadguides 4.
  • the invention can be used in particular on spinning machines and on looms dealing with groups of parallel threads, each being controlled by a thread sensor.
  • the invention can also be used on other kinds of filamentary elements, such as electric wires and particularly in machines for coiling such wires.
  • a thread-sensing device which is a contact arrangement permitting the passage of very heavy currents capable of actuating, for example, a plurality of thread-cutting units arranged electrically in series.
  • a thread sensing device comprising a fixed electrical contact; a movable contact biased towards said fixed contact by resilient means; a pivoting latch with means to pivot said latch and including ferro-magnetic material movable between an active position in which a portion of said latch is compressed by said resilient means between said movable contact and the latch pivot means, and a rest position wherein said portion of said latch is angularly displaced from the path of said movable contact; a permanent magnet located in proximity to said latch and movable to and out of an operating position in which the magnetic force exerted on said ferro-magnetic material rocks said latch from the active position to the rest position; and a biased thread engaging sensor connected to said permanent magnet and held by thread tension in a first position and which moves in the absence of thread tension into a second position for urging said magnet into said operating position.
  • a thread sensing device in which said magnet and said sensor are connected together for common angular movement about a pivotal axis.
  • a thread sensing device in which said permanent magnet is rectilinear and acts through one of its ends on said latch, and a ferromagnetic mass adjustably positionned in the field of attraction at its other end.
  • a thread sensing device in which a plunger with a resilient return action acts on said latch to bring it into said latching position, said movable contact including an inclined portion cooperating with the active portion of said latch to open said contacts thereby overcoming the force of said resilient return action.
  • a thread sensing device in which said latch is a mild-steel rocking lever, one end of which is located in the field of attraction of said magnet, whilst the other end constitutes a latch to keep said contacts separated from each other.
  • a thread sensing device in which the elements of the device are contained in a case constituted by two moulded halves which, when fitted together, hold the various components of the device in position.
  • a thread sensing device in which the two halves of the case include two thread guides between which can move said thread sensor.
  • a thread sensing device in which a second hand-operated latch is provided to retain said sensor in the active position.
  • a thread sensing device in which said second latch can move between said two thread guides to lock said sensor in its active position.
  • a thread sensing device further characterized by a transverse member in the path of movement of said pivoting latch in contact with said portion of said latch when said latch is in the rest position, one end of said magnet abutting against said latch when said magnet is in operatin position.
  • a t read sensing device wherein a ferromagnetic mass is adjustably positioned in the field of attraction of said magnet at its other end beyond abutting relationship with said magnet whereby adherence of said magnet and said ferromagnetic mass is prevented.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Looms (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Sewing Machines And Sewing (AREA)
US32635A 1969-04-29 1970-04-28 Thread-sensing device for a textile machine Expired - Lifetime US3676990A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6913611A FR2041553A5 (enrdf_load_stackoverflow) 1969-04-29 1969-04-29

Publications (1)

Publication Number Publication Date
US3676990A true US3676990A (en) 1972-07-18

Family

ID=9033234

Family Applications (1)

Application Number Title Priority Date Filing Date
US32635A Expired - Lifetime US3676990A (en) 1969-04-29 1970-04-28 Thread-sensing device for a textile machine

Country Status (10)

Country Link
US (1) US3676990A (enrdf_load_stackoverflow)
BE (1) BE749088A (enrdf_load_stackoverflow)
CH (1) CH533058A (enrdf_load_stackoverflow)
CS (1) CS160126B2 (enrdf_load_stackoverflow)
DE (1) DE2019484A1 (enrdf_load_stackoverflow)
ES (1) ES378965A1 (enrdf_load_stackoverflow)
FR (1) FR2041553A5 (enrdf_load_stackoverflow)
GB (1) GB1310122A (enrdf_load_stackoverflow)
LU (1) LU60774A1 (enrdf_load_stackoverflow)
NL (1) NL7006039A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3727393A (en) * 1970-11-06 1973-04-17 Vyzk Ustav Bavlnarsky Thread breakage detector
US4091606A (en) * 1976-08-16 1978-05-30 Fritz Stahlecker Open end spinning frame with a magnetic switch for sliver feed
US4300340A (en) * 1979-04-26 1981-11-17 Schubert & Salzer Housing for holding a thread monitor comprising a thread tension sensor
US4300341A (en) * 1979-04-26 1981-11-17 Schubert & Salzer Housing for holding a control device with heat-generating elements for a thread monitor of an open-end spinning station

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3132466A (en) * 1959-06-29 1964-05-12 Preisser Gunther Device for indicating thread breakage particularly in spinning machines
US3262180A (en) * 1965-05-12 1966-07-26 Scragg & Sons Device for detecting yarn breakage
US3404524A (en) * 1966-03-19 1968-10-08 Vyzk Ustav Bavlnarsky Apparatus for regulating the operation of yarn spinning machines
US3420048A (en) * 1966-08-09 1969-01-07 Luwa Ag Method and apparatus for monitoring the travel of a fiber strand at fly frames or the like
US3438188A (en) * 1966-10-11 1969-04-15 Allied Chem Yarn defect detecting device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3132466A (en) * 1959-06-29 1964-05-12 Preisser Gunther Device for indicating thread breakage particularly in spinning machines
US3262180A (en) * 1965-05-12 1966-07-26 Scragg & Sons Device for detecting yarn breakage
US3404524A (en) * 1966-03-19 1968-10-08 Vyzk Ustav Bavlnarsky Apparatus for regulating the operation of yarn spinning machines
US3420048A (en) * 1966-08-09 1969-01-07 Luwa Ag Method and apparatus for monitoring the travel of a fiber strand at fly frames or the like
US3438188A (en) * 1966-10-11 1969-04-15 Allied Chem Yarn defect detecting device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3727393A (en) * 1970-11-06 1973-04-17 Vyzk Ustav Bavlnarsky Thread breakage detector
US4091606A (en) * 1976-08-16 1978-05-30 Fritz Stahlecker Open end spinning frame with a magnetic switch for sliver feed
US4300340A (en) * 1979-04-26 1981-11-17 Schubert & Salzer Housing for holding a thread monitor comprising a thread tension sensor
US4300341A (en) * 1979-04-26 1981-11-17 Schubert & Salzer Housing for holding a control device with heat-generating elements for a thread monitor of an open-end spinning station

Also Published As

Publication number Publication date
CH533058A (fr) 1973-01-31
FR2041553A5 (enrdf_load_stackoverflow) 1971-01-29
NL7006039A (enrdf_load_stackoverflow) 1970-11-02
DE2019484A1 (de) 1970-11-12
LU60774A1 (enrdf_load_stackoverflow) 1970-06-26
BE749088A (fr) 1970-10-01
ES378965A1 (es) 1972-08-01
CS160126B2 (enrdf_load_stackoverflow) 1975-02-28
GB1310122A (en) 1973-03-14

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