EP0045643B1 - Thread brake - Google Patents

Thread brake Download PDF

Info

Publication number
EP0045643B1
EP0045643B1 EP81303520A EP81303520A EP0045643B1 EP 0045643 B1 EP0045643 B1 EP 0045643B1 EP 81303520 A EP81303520 A EP 81303520A EP 81303520 A EP81303520 A EP 81303520A EP 0045643 B1 EP0045643 B1 EP 0045643B1
Authority
EP
European Patent Office
Prior art keywords
thread
brake
brake disc
disc
discs
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
Application number
EP81303520A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0045643A3 (en
EP0045643A2 (en
Inventor
Werner Häussler
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.)
Gutermann and Co AG
Guetermann and Co AG
Original Assignee
Gutermann and Co AG
Guetermann and Co AG
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 Gutermann and Co AG, Guetermann and Co AG filed Critical Gutermann and Co AG
Priority to DE1981303520 priority Critical patent/DE45643T1/de
Publication of EP0045643A2 publication Critical patent/EP0045643A2/en
Publication of EP0045643A3 publication Critical patent/EP0045643A3/en
Application granted granted Critical
Publication of EP0045643B1 publication Critical patent/EP0045643B1/en
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/05—Magnetic devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2305/00—Operations on the work before or after sewing
    • D05D2305/50—Removing cut-out material or waste

Definitions

  • the invention relates to a thread brake, especially suitable for sewing thread and like threads, of the type comprising two brake discs which are located coaxially to one another and between which the thread is guided, in which the brake discs can be urged together, e.g. by an electromagnet, so as to regulate their braking effect on the thread.
  • Thread brakes of this type are already known for setting or regulating the thread tension during winding of the thread.
  • material becomes abraded from the thread, especially in the form of fibre dust or residues of dyes and finishing agents, and deposited on the braking faces of the brake discs. This of course adversely affects the operation of the brake.
  • electromagnets used to urge the brake discs together have been subjected to alternating current, so that the brake disc or discs are caused to vibrate. As a result, the abraded material can be shaken off from the brake discs.
  • the disadvantage of such an alternating current magnetic brake is that difficulties can arise when the alternating current is regulated to vary the braking force, or else that alternating current is not directly available. Moreover, only relatively narrow regulating limits for the braking force exist.
  • An object of the present invention is to provide a thread brake of the type mentioned, the construction of which is simple and inexpensive, but which can still be regulated easily and within wide ranges and yet is designed to be self-cleaning.
  • a thread brake especially suitable for sewing thread and like threads, with two brake discs which are located coaxially to one another and between which the thread is guided, in which the brake discs can be urged together so as to regulate their braking effect on the thread, characterised in that at least one of the brake discs is rotatably mounted and at least one interruption is provided in the braking face of at least one of the brake discs.
  • interruption is a recess in the braking face of a brake disc, and it is preferred that this recess communicates with the opposite face of the disc so as to form an aperture from one face to the other.
  • the rotatably mounted brake disc is preferably freely mounted so that it will automatically be rotated by the thread running between the brake discs.
  • an electromagnet be used to urge the brake discs together, and this electromagnet can best be operated by means of direct current.
  • Other urging means, such as springs, can however be used.
  • a preferred embodiment provides that the rotatable brake disc has, at a radial distance from the outer margin, a concave depression on its braking side, and that the approximately plane marginal annular region preferably has a radial width of approximately 1/4 of the radius of the brake disc. It has been shown, in practice, that the abraded material is removed especially effectively thereby.
  • the interruption is provided in the inner portion of the outer annular region of the braking face so as to merge with the axially set-back region, to allow the deposits to be conveyed away out of the region of the braking faces.
  • An advantageous development of the invention provides that the thread runs at an angle round a sleeve and that the resultant-force of the electromagnet or other urging device, which engages on the brake disc, lies within a triangle formed by the thread strands, with the deflecting point of the sleeve as the apex, this triangle being limited by a secant which passes through the points of intersection of the thread strands with the outer margin of the brake discs.
  • a tilt-proof support is thus provided by means of the approximately V-shaped support of the brake disc, and a direct contact between the two brake discs is also prevented by this tilt-proof support.
  • the movable brake disc is mounted with a radial play on the sleeve, which also serves as a thread guide, and that, in its functional position, the thread has an angle, with the sleeve as apex, in the range from preferably approximately 110 degrees to approximately 160 degrees. Because of the radial play of the movable brake disc, this can also tilt or rock to a certain extent, so that it can apply itself effectively to the thread.
  • the interruptions or the like in the brake discs have widened portions away from the braking face. This also assists the conveying away of the abraded material.
  • the rotatable brake disc or discs can be connected to a retarding device. This also makes it possible to influence the braking action on the thread running through.
  • at least one of the brake discs could have a rotary drive, in which case the drive is effected, for example, via a magnetic rotating field of the brake magnet and in which case, if appropriate, the direction of the rotary drive is provided against the direction of rotation of the thread, and the speed of the rotary drive can preferably be varied.
  • the braking action on the thread can be influenced, and it can be provided, if appropriate, that a braking action at a fixed presetting could be produced by means of an axial adjustment of the brake discs and that an additional precise adjustment of the braking force could be produced by influencing the rotation of the brake disc.
  • a thread brake designated as a whole by 1, has as its essential components two brake discs 2 and 3, and an electromagnet 4.
  • the brake disc 3 can be pulled towards the other brake disc 2 and pressed against the latter with a varying contact force via a regulating device (not shown).
  • the thread 5 shown in Figure 3 is guided between the two brake discs 2 and 3.
  • the brake disc 3 is freely mounted rotatably on a sleeve 8, made of wear-resistant material, the sleeve 8 being freely mounted on, but retained by a central pin 8a passing through the body of the electromagnet 4.
  • the sleeve 8 is located in a recess 8b in the forward end of the body of the electromagnet 4.
  • the sleeve 8 projects beyond the outer face of the disc 3 to allow the disc 3 to move away from, and or tilt with respect to the electromagnet 4.
  • the axial movement of disc 3 away from the electromagnet 4 is limited by a retaining ring 9.
  • Disc 3 is caused to rotate by the movement of the thread 5 between the two brake discs.
  • Brake disc 2 can also be mounted rotatably, but is preferably arranged to rotate at a different speed than brake disc 3. A more uniform wear on a brake disc can be achieved if it rotates, since different parts are continuously being engaged because of the rotation.
  • brake disc 2 is shown in Figure 1 as also being rotatably mounted on sleeve 8, it is under greater frictional restraint than brake disc 3 and hence, in operation, will either not rotate at all or will rotate slower than disc 3.
  • Brake disc 2 is made of non-magnetic material, whereas the brake disc 3 consists of a ferromagnetic material.
  • FIGS. 3 and 5 make it clear that the interruptions 7 or the like are located at a radial distance from the outer margin of the brake disc 3.
  • the actual braking face 6 is formed essentially by an outer annular region 10, the interruptions 7 being provided in the inner portion of the outer annular region 10 so as to merge with an inner axially set-back region 11. This facilitates the conveying away of abraded material.
  • the brake disc 3 has, at a radial distance from the outer margin 12, a concave depression 13 on its braking side, as the set- back region 11.
  • a continuous transition for the abraded material from the annular region 10 of the braking face to the removal points is provided, so that said abraded material can be removed, in particular, without being able to settle.
  • the above-mentioned depression 13 has a depth of less than 1 mm, for example 0.1 mm.
  • the distance between the interruptions on the braking face and the outer margin of the braking face is suitably about 20% of the radius of the brake disc 3.
  • the interruptions 7 in the brake disc 3 have widened portions 15 which become larger towards the rear side 14, i.e. away from the braking face (6).
  • the interruptions 7 are formed by round holes, and these are arranged in a concentric circle.
  • the number and size of the interruptions can be provided according to the respective requirements. Among other things, this can depend on the thread structure or also the thread material and also the speed of transport of the thread 5.
  • eight round interruptions 7 are provided, the inside diameter of which is approximately 1/4 of the radius of the brake disc 3.
  • the largest outlines of the widened portions 15 adjoining the interruptions 7 are provided so that their outer margins virtually touch one another.
  • the central hole 16 for the sleeve 8 also has a conical widened portion 15a, the axial depth of which is approximately 2/3 of the wall thickness of the brake disc 3.
  • the bearing face for the sleeve 8 is comparatively small, as a result, so that the brake disc 3 can also be tilted on the sleeve 8. It can thereby apply itself effectively to the thread 5.
  • the thread is provided to run at an angle round the sleeve 8, as illustrated in Figure 3.
  • the resultant of the magnetic forces acting on the brake disc 3 lie within the triangle limited, on the one hand, by the thread strands and, on the other hand, by a secant 20, the latter passing through the points of intersection of the thread strands with the outer margin 12 of the brake disc.
  • the said angle of thread 5 can, for example, be 110 to 160 degrees, and the above-mentioned conditions regarding the resultant of the magnetic forces applied should be satisfied.
  • a modified embodiment of a brake disc 3a is shown in Figures 5 and 6.
  • an approximately cylindrical central countersink 17 is provided as the setback region 11, the shoulder of this countersink 1 being bevelled towards the braking face 6 in regions, thus forming the interruptions 7 or the like.
  • a brake disc 3a of this type can, above all, be manufactured simply.
  • openings 18 in the wall of the brake disc are designed to run in an approximately slit-shaped manner in a peripheral direction.
  • Abraded material which passes from the braking face via the bevels 19 into the region of the countersink 17, can thereby be removed outwards from the gap between the two brake discs 2 and 3a.
  • the bevels 19 have an inner shape corresponding to approximately a quarter of a sphere.
  • abraded material can be removed additionally via the gap in the bearing region at the sleeve 8.
  • the invention provides a thread brake 1 which can be operated by means of direct current, but is, nevertheless, self-cleaning, so that reliable functioning is ensured even over a relatively long period of operation.
  • the possibility of using direct current to control the thread brake is advantageous particularly also in connection with the control of an entire system within which the thread brake is employed.
  • the rotatable brake disc 3 can also be connected to a retarding device.
  • the brake disc 3 is rotated by means of the thread 5 at a lower angular speed than the thread speed, due mainly to the braking effect of the electromagnet.
  • the braking force acting on the thread 5 could be varied finely. Because of the distance between the two brake discs 2 and 3, a certain braking force could then be preset, and a precisely adjusted variation of the braking force, superimposed on the latter, could be effected by retarding the rotatable disc 3.
  • a further possible embodiment of the invention could provide that at least one of the brake discs 2, 3 should have a rotary drive which is effective, for example, via a magnetic rotating field of the brake magnet 4.
  • the direction of the rotary drive could then be provided especially against the direction of rotation by the thread 5 and, in particular, its speed could also be variable, so that here, also, it would be possible to influence the actual braking force on the thread 5.
  • the inner brake device 2 could be provided by a wall, e.g. an end wall of the housing of the electromagnet 4.
  • the term disc used herein must be construed accordingly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Braking Arrangements (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Sewing Machines And Sewing (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
EP81303520A 1980-08-04 1981-07-31 Thread brake Expired EP0045643B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1981303520 DE45643T1 (de) 1980-08-04 1981-07-31 Fadenbremse.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3029509 1980-08-04
DE19803029509 DE3029509A1 (de) 1980-08-04 1980-08-04 Fadenbremse

Publications (3)

Publication Number Publication Date
EP0045643A2 EP0045643A2 (en) 1982-02-10
EP0045643A3 EP0045643A3 (en) 1982-04-21
EP0045643B1 true EP0045643B1 (en) 1984-06-27

Family

ID=6108849

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81303520A Expired EP0045643B1 (en) 1980-08-04 1981-07-31 Thread brake

Country Status (3)

Country Link
EP (1) EP0045643B1 (es)
DE (2) DE3029509A1 (es)
ES (1) ES8206362A1 (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3409179A1 (de) * 1984-03-13 1985-09-19 Gebrüder Frei GmbH & Co KG, 7470 Albstadt Fadenbremse fuer textilmaschinen
DE4104663C1 (es) * 1991-02-15 1992-08-13 Memminger-Iro Gmbh, 7290 Freudenstadt, De
DE4130301A1 (de) * 1991-09-12 1993-03-18 Schlafhorst & Co W Rotierend angetriebene bremstelleranordnung eines fadenspanners
DE4409450C2 (de) * 1994-03-18 1996-12-05 Memminger Iro Gmbh Fadenbremseinrichtung
JP4046431B2 (ja) * 1999-01-18 2008-02-13 Ｊｕｋｉ株式会社 ミシンの糸調子装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1487014A1 (de) * 1966-05-04 1968-12-19 Singer Co Steuerstromkreis,insbesondere fuer Naehmaschinen
IT1013933B (it) * 1974-05-06 1977-03-30 Necchi Spa Gruppo regolatore della tensione del filo superiore con dispositi vo di rilascio automatico della tensione
CH589559A5 (es) * 1975-12-24 1977-07-15 Mefina Sa

Also Published As

Publication number Publication date
EP0045643A3 (en) 1982-04-21
DE3164429D1 (en) 1984-08-02
DE3029509A1 (de) 1982-03-25
ES504514A0 (es) 1982-08-16
EP0045643A2 (en) 1982-02-10
ES8206362A1 (es) 1982-08-16

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