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EP2037031B1 - Vorrichtung zur Reduktion von Nähmaschinenvibrationen - Google Patents

Vorrichtung zur Reduktion von Nähmaschinenvibrationen Download PDF

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Publication number
EP2037031B1
EP2037031B1 EP08466025A EP08466025A EP2037031B1 EP 2037031 B1 EP2037031 B1 EP 2037031B1 EP 08466025 A EP08466025 A EP 08466025A EP 08466025 A EP08466025 A EP 08466025A EP 2037031 B1 EP2037031 B1 EP 2037031B1
Authority
EP
European Patent Office
Prior art keywords
balancing
eccentric
crank
needle bar
arm
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.)
Not-in-force
Application number
EP08466025A
Other languages
English (en)
French (fr)
Other versions
EP2037031A1 (de
Inventor
Pavel Sidlof
Petr Skop
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.)
Vuts AS
Original Assignee
Vyzkumny Ustav Textilnich Stroju Liberec AS
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Filing date
Publication date
Application filed by Vyzkumny Ustav Textilnich Stroju Liberec AS filed Critical Vyzkumny Ustav Textilnich Stroju Liberec AS
Publication of EP2037031A1 publication Critical patent/EP2037031A1/de
Application granted granted Critical
Publication of EP2037031B1 publication Critical patent/EP2037031B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/30—Details
    • D05B69/32—Vibration-minimising devices

Definitions

  • Needle bar of sewing machine is usually driven by a crank mechanism transferring the engine rotational motion driving the machine upper shaft to a straight-line reverse motion of needle bar. Due to high rotation speed of the upper shaft at the current sewing machines the bearing of upper shaft and the arm of sewing machine are loaded by considerable dynamic forces, which are transferred to the whole machine, causing its vibrations and increasing the operational noise of the machine.
  • the dynamic forces are composed of harmonic components of various frequencies. Frequency of the first harmonic component is identical with frequency of rotation of the crank shaft, frequency of the second harmonic component has double value, etc.
  • the first harmonic component is usually called inertia force of first order
  • the second harmonic component is inertia force of second order, etc.
  • Balancing of sewing machines is commonly solved by counterweight on the crank or on the crank shaft only balancing the centrifugal force and partially also inertia force of first order , nevertheless it results in creation of a similar inertia force in direction being perpendicular to the direction of straight-line reverse motion of the needle bar.
  • the forces of higher orders, whose frequencies are close to resonance frequency of machine arm, remain unbalanced.
  • Simple damping of induced vibrations is represented by a flexible mounting of upper shaft by means of spring rings arranged between the bearing outer ring of the upper shaft and the box of arm of the sewing machine according to the JP 8159153 , which nevertheless only reduces the result of vibrations already being induced.
  • the upper shaft of the sewing machine is coupled by means of toothed gearing with two counter-rotating auxiliary shafts provided with counterweights.
  • the used gear ratio between the upper shaft and auxiliary shafts it is possible to balance the first (ratio 1 to 1), or the second harmonic component (ratio 1 to 2).
  • the JP 8038778 uses a counterweight positioned so that it is turned by 180° with respect to the position of the crank of needle bar mechanism and moreover of an absorbing means positioned in vicinity of the greatest radius of the sewing machine arm.
  • the upper shaft comprises the crankshaft throw turned by 180° with respect to the crank of crankshaft mechanism of needle bar, while the pin of this throw is inserted in the groove of the damping swing arm rotatably mounted in the frame of sewing machine with pivot axis being parallel with the upper shaft.
  • the toothed wheel connected with the upper shaft engages with the counter-rotating additional toothed wheel of the same dimension, while the counterweights of both wheels balance both the vertical inertia forces of first order without inducing similar inertia forces in direction perpendicular to the motion direction of needle bar.
  • This principle is similar to the JP 7124361 .
  • the tuned vibration absorbers known for example from the sphere of crank mechanisms of combustion engines are effective only in a limited rotation speed range of machine and they partially balance only some harmonic components.
  • Mechanism of the thread feeder is usually formed of four-joint mechanism directly connected with the crank mechanism of needle bar.
  • the main harmonic components of its motion are in motion direction of needle bar similar to harmonic components of needle bar.
  • a similar method of balancing creates a content of DE 4325116 C1 document, at which the auxiliary balancing device is formed of balancing four-joint mechanism to whose drive an eccentric on upper shaft is used.
  • Balancing according to the patent is provided altogether with three balancing masses.
  • the first balancing mass is the counterweight connected in a known method to the crank of the needle bar mechanism. This balances centrifugal forces only and if its mass is higher, it balances partially or entirely the vertical inertia forces of first order, but on the account of inducing forces of the same strength in horizontal direction.
  • the second balancing mass is the counterweight driven by relatively complicated and dimensional auxiliary four-joint balancing mechanism in an arm of the sewing machine, which according to the description is designated for balancing of inertia forces of first order.
  • the third counterweight has a narrowly specified function related to activity of a specific sewing machine designed for sewing of a double lockstitch. According to this patent, inertia forces of higher orders are not being balanced.
  • the goal of this invention is to eliminate the shortcomings of the present background art or to reduce them considerably.
  • the balancing device is formed by a balancing eccentric mechanism, which comprises in an arm of the machine in a flexible and/or sliding manner mounted exit member, in which a cylindric hole is performed, in which rotatably is mounted the second eccentric, in which with eccentricity (e) the cylindric hole is performed, in which is rotatably mounted the first eccentric, which with eccentricity (r) is firmly connected with upper shaft of the sewing machine.
  • a balancing eccentric mechanism which comprises in an arm of the machine in a flexible and/or sliding manner mounted exit member, in which a cylindric hole is performed, in which rotatably is mounted the second eccentric, in which with eccentricity (e) the cylindric hole is performed, in which is rotatably mounted the first eccentric, which with eccentricity (r) is firmly connected with upper shaft of the sewing machine.
  • the advantage is a short lift of exit member of the balancing eccentric mechanism and a resulting fact that this device is not demanding as to space and it can be guided by flexible members and/or by means of a slide-way.
  • balancing means are situated in close vicinity of the needle bar being balanced and due to the fact that the centre of gravity of exit member of the balancing eccentric mechanism is moving in a plane perpendicular to the upper shaft, very good balancing of the thread feeder mechanism is achieved.
  • the exit member in an arm of the sewing machine is flexibly mounted between in parallel manner arranged flat springs, out of which each is fastened with its one end to arm of the sewing machine and with its opposite end to the exit member.
  • Fig. 1 shows the side view to arrangement of the upper shaft, crank mechanism of the needle bar, thread feeder mechanism and balancing eccentric mechanism in arm of the sewing machine
  • Fig. 2 front view to the crank mechanism of the needle bar, mechanism of the thread feeder and the balancing eccentric mechanism in arm of the sewing machine
  • Fig. 3 geometric relations of crank mechanism of the needle bar and the balancing eccentric mechanism.
  • the upper part of sewing machine is formed by the arm 1 of sewing machine in whose inner space in longitudinal direction is arranged the upper shaft 11 driven by the non-represented electro-motor by means of the belt 111 and belt pulley 112 .
  • the upper shaft 11 is rotatably mounted in bearings 12 .
  • On the side reversed from the belt pulley 112 on the upper shaft 11 is attached the crank 113 , on whose crank journal 114 there is mounted the upper eye of the conrod 13 and the lower eye of the thread feeder 14 .
  • In vertical guiding bearings 15 displaceably is mounted the needle bar 16 with which the lower eye of the conrod 13 is connected rotatably.
  • the upper eye of the thread feeder 14 is rotatably connected with one eye of the conrod 17 of the thread feeder 14 mechanism.
  • the second eye of the conrod 17 is rotatably mounted on the pin 18 , which is firmly connected with frame of the arm 1 of sewing machine.
  • the conrod 17 forms a pitman of four-joint mechanism, whose further members are the frame of the arm 1 of sewing machine, the thread feeder 14 and the crank 113 .
  • the balancing device is arranged, which is formed by the balancing eccentric mechanism 19 which comprises the first eccentric 191 firmly connected with upper shaft 11 , while the centre s1 and thus the axis of the outer cylindric surface of the first eccentric 191 intersects the straight line p passing through the axis of the crank journal 114 and the axis of upper shaft 11 outside the join of axes of the crank journal 114 and axis of the upper shaft 11 behind the axis of the upper shaft 11 .
  • the first eccentric 191 by its outer circumference is rotatably mounted in cylindric cavity of the second eccentric 192 , which by its outer circumference is rotatably mounted in cylindric cavity of the exit member 193 of the balancing eccentric mechanism 19 .
  • the eccentricity r of the first eccentric 191 is given by the distance of axis of the upper shaft 11 and the centre s1 of the first eccentric 191 .
  • the eccentricity e of the second eccentric 192 is given by the distance of the centre s2 of the second eccentric 192 and the centre s1 of the first eccentric 191 .
  • the eccentricity r of the first eccentric 191 is several times smaller than the length R of the crank 113 .
  • the eccentricity e of the second eccentric 192 is several times smaller than the length I of the conrod 13 .
  • the weight of the exit member 193 of the balancing eccentric mechanism 19 is greater than the weight of the needle bar 16 .
  • the exit member 193 is formed of a flat square body to whose opposite external walls the ends of two flat springs 194 are fastened. Opposite ends of springs are firmly connected with frame of the arm 1 of sewing machine, thus also with frame of the sewing machine. At this solution deformation of the flat springs 194 arising as a result of the side motion of the exit member 193 of the balancing eccentric mechanism 19 may partially balance the horizontal inertia force of mechanism of the thread feeder 14 .
  • the exit member 193 of the balancing eccentric mechanism 19 is formed of a body of any spatially convenient shape arranged so that its centre of gravity is in direction of axis of the upper shaft 11 as close as possible to centre of gravity of the needle bar 16 .
  • exit member 193 of the balancing eccentric mechanism 19 is guided in a straight-lined slide-way, at the same time in direction of this way it may be mounted in a spring manner between two pressure springs.
  • the needle bar 16 Upon rotating of the upper shaft 11 the needle bar 16 performs the working lifts.
  • the size of a whole lift of the needle bar equals to double length of crank R of the crank 113
  • the exit member 193 of the balancing eccentric mechanism 19 performs a lift, which equals to double of eccentricity r of the first eccentric 191 .
  • the cyclic springy deformations of the flat springs 194 occur which the vertical motion of the exit member 193 of the balancing eccentric mechanism 19 enable through their elasticity.
  • the flat springs 194 generate also the force which reduces the inertia forces between the eccentrics 191 , 192 and the exit member 193 of the balancing eccentric mechanism 19 .
  • the first eccentric 191 in principle balances the centrifugal force of the crank 113 , the balancing eccentric mechanism 19 as a whole balances the inertia forces of the needle bar 16 , of conrod 13 and partially also the inertia forces of thread feeder 14 mechanism.
  • the device for reducing vibrations of sewing machines induced by dynamic forces of the crank mechanism of needle bar 16 and of thread feeder 14 mechanism creates an integral unit which can be easily built-in into an arm of the sewing machine 1 with assumption of low acquisition costs, good efficiency and reliability. It is advantageous that the centre of gravity of exit member 193 of the balancing eccentric mechanism 19 is situated in a minimum distance from the needle bar 16 . At the same time this centre of gravity moves in a plane perpendicular to the upper shaft 11 , through which a better balancing of the thread feeder 14 can be achieved.
  • the balancing eccentric mechanism according to the invention also reduces forces exerting load to bearings of the upper shaft 11 .
  • the invention may be applied at all types of sewing machines using the crank or link mechanism for drive of needle bar. It is especially applicable at industrial high-speed sewing machines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Claims (3)

  1. Vorrichtung zur Erniedrigung der Vibrationen der Nähmaschinen, die durch die dynamischen Kräfte des Kurbelgetriebes der Nadelstange (16) und des Mechanismus des Fadenhebels (14) hervorgerufen werden, wobei die Kurbel (113) des Kurbelgetriebes der Nadelstange (16) und des Mechanismus des Fadenhebels (14) auf der oberen Welle (11) befestigt ist, die im Arm (1) der Nähmaschine drehbar gelagert und mit der Auswuchtvorrichtung gekoppelt ist, dadurch gekennzeichnet, dass die Auswuchtvorrichtung von einer Auswuchtexzentervorrichtung (19) gebildet wird, die im Maschinenarm (1) ein flexibel und/oder gleitend gelagertes Ausgangsglied (193) aufweist, in dem eine walzenförmige Öffnung gebildet ist, in der der zweite Exzenter (192) drehbar gelagert ist, in dem eine walzenförmige Öffnung mit der Exzentrizität (e) gebildet ist, in der der erste Exzenter (191) drehbar gelagert ist, der mit der Exzentrizität (r) mit der oberen Welle (11) der Nähmaschine drehfest verbunden ist.
  2. Vorrichtung nach dem Anspruch 1, dadurch gekennzeichnet, dass die Exzentrizität (r) des ersten Exzenters (191) in Bezug auf die Kurbel (113) des Kurbelgetriebes der Nadelstange (16) um 180° gedreht ist.
  3. Vorrichtung nach dem Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Ausgangsglied (193) in dem Arm (1) der Nähmaschine zwischen den parallellaufend angeordneten Flachfedern (194) flexibel gelagert ist, von denen jede mit ihrem Ende am Arm (1) der Nähmaschine und mit ihrem anderen Ende am Ausgangsglied (193) befestigt ist.
EP08466025A 2007-09-14 2008-09-12 Vorrichtung zur Reduktion von Nähmaschinenvibrationen Not-in-force EP2037031B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CZ20070642A CZ301075B6 (cs) 2007-09-14 2007-09-14 Zarízení ke snížení vibrací šicích stroju

Publications (2)

Publication Number Publication Date
EP2037031A1 EP2037031A1 (de) 2009-03-18
EP2037031B1 true EP2037031B1 (de) 2010-06-30

Family

ID=40244012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08466025A Not-in-force EP2037031B1 (de) 2007-09-14 2008-09-12 Vorrichtung zur Reduktion von Nähmaschinenvibrationen

Country Status (3)

Country Link
EP (1) EP2037031B1 (de)
CZ (1) CZ301075B6 (de)
DE (1) DE602008001640D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109610104B (zh) * 2019-01-29 2024-03-15 浙江耐拓机电科技有限公司 一种模板缝纫机

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4325116C1 (de) 1993-07-27 1994-10-20 Pfaff Ag G M Nähmaschine mit einem Massenausgleichsmechanismus
JPH07124361A (ja) * 1993-11-09 1995-05-16 Brother Ind Ltd ミシン
JPH0838778A (ja) 1994-07-27 1996-02-13 Brother Ind Ltd ミシンの振動防止装置
JPH0871285A (ja) 1994-09-09 1996-03-19 Brother Ind Ltd ミシンの駆動機構
JPH08159153A (ja) * 1994-12-01 1996-06-18 Brother Ind Ltd 軸受装置
DE29710108U1 (de) * 1996-06-13 1997-08-14 S&W Engineering GmbH, 47441 Moers Stickmaschine mit Massenausgleich 1. Ordnung
EP1388601A3 (de) * 2002-08-09 2006-07-05 Hashima Co., Ltd. Nähmaschine
EP1947227A1 (de) * 2007-01-17 2008-07-23 Sunstar Precision Co., Ltd. Näharmmechanismus einer Stickmaschine

Also Published As

Publication number Publication date
CZ301075B6 (cs) 2009-10-29
EP2037031A1 (de) 2009-03-18
CZ2007642A3 (cs) 2009-03-25
DE602008001640D1 (de) 2010-08-12

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