EP2037031B1 - Device for reducing vibrations of sewing machines - Google Patents
Device for reducing vibrations of sewing machines Download PDFInfo
- 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.)
- Expired - Fee Related
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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.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Description
- The device for reducing vibrations of sewing machines induced by dynamic forces of the crank mechanism of needle bar and the thread feeder mechanism, while the crank of the crank mechanism of needle bar and of thread feeder mechanism is attached to the upper shaft, which is rotatably mounted in arm of the sewing machine and is coupled with the balancing device.
- 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 - Some solutions in balancing of sewing machines use the principles used at the crank mechanisms of combustion engines.
- According to the
JP 7124361 ratio 1 to 1), or the second harmonic component (ratio 1 to 2). - To balance the needle bar the
JP 8038778 - According to the
JP 8071285 - According to the
US 5839381 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 theJP 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.
- At many industrial sewing machines the effects of acting of high inertia forces must be reduced by using the machine arm of a high weight.
- 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 shortcoming at the known mechanisms for balancing the needle bar and the thread feeder is imperfect balancing or structurally complicated and thus in terms of space and price demanding solution. Due to this majority of sewing machines is produced without balancing devices, which has a negative impact to their operational properties and service life of the machines.
- The goal of this invention is to eliminate the shortcomings of the present background art or to reduce them considerably.
- The goal of the invention has been achieved through the device whose principle consists in that 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.
- 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.
- It is also advantageous if at the same time the eccentricity of the first eccentric is turned by 180° with respect to the crank of the needle bar crank mechanism.
- Moreover this solution is simple as to its manufacturing.The 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.
- Such solution enables an exact guiding of the exit member without play. Moreover the lateral motion of exit member of the balancing eccentric mechanism caused by deformation of the flat springs contributes to balancing of horizontal inertia forces of the thread feeder mechanism.
- Exemplary embodiment according to the invention is represented in the drawing where the
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, theFig. 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 and theFig. 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 theupper shaft 11 driven by the non-represented electro-motor by means of thebelt 111 andbelt pulley 112 . Theupper shaft 11 is rotatably mounted inbearings 12 . On the side reversed from thebelt pulley 112 on theupper shaft 11 is attached thecrank 113 , on whosecrank journal 114 there is mounted the upper eye of theconrod 13 and the lower eye of thethread feeder 14 . In vertical guidingbearings 15 displaceably is mounted theneedle bar 16 with which the lower eye of theconrod 13 is connected rotatably. The upper eye of thethread feeder 14 is rotatably connected with one eye of theconrod 17 of thethread feeder 14 mechanism. The second eye of theconrod 17 is rotatably mounted on thepin 18, which is firmly connected with frame of thearm 1 of sewing machine. Thus theconrod 17 forms a pitman of four-joint mechanism, whose further members are the frame of thearm 1 of sewing machine, thethread feeder 14 and thecrank 113 . - In exemplary embodiment between the
bearing 12 ofupper shaft 11 being adjacent to theneedle bar 16 and thecrank 113 the balancing device is arranged, which is formed by the balancingeccentric mechanism 19 which comprises the first eccentric 191 firmly connected withupper 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 thecrank journal 114 and the axis ofupper shaft 11 outside the join of axes of thecrank journal 114 and axis of theupper shaft 11 behind the axis of theupper 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 balancingeccentric 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 thecrank 113 . Similarly the eccentricity e of the second eccentric 192 is several times smaller than the length I of theconrod 13. In similar ratio the weight of theexit member 193 of the balancingeccentric mechanism 19 is greater than the weight of theneedle bar 16 . - The
exit member 193 is formed of a flat square body to whose opposite external walls the ends of twoflat springs 194 are fastened. Opposite ends of springs are firmly connected with frame of thearm 1 of sewing machine, thus also with frame of the sewing machine. At this solution deformation of theflat springs 194 arising as a result of the side motion of theexit member 193 of the balancingeccentric mechanism 19 may partially balance the horizontal inertia force of mechanism of thethread feeder 14 . - In the not represented embodiment the
exit member 193 of the balancingeccentric 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 theupper shaft 11 as close as possible to centre of gravity of theneedle bar 16 . - In another not represented embodiment the
exit member 193 of the balancingeccentric 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. - Upon rotating of the
upper shaft 11 theneedle bar 16 performs the working lifts. The size of a whole lift of the needle bar equals to double length of crank R of thecrank 113, while theexit member 193 of the balancingeccentric mechanism 19 performs a lift, which equals to double of eccentricity r of the first eccentric 191 . At this activity the cyclic springy deformations of theflat springs 194 occur which the vertical motion of theexit member 193 of the balancingeccentric mechanism 19 enable through their elasticity. At the same time theflat springs 194 generate also the force which reduces the inertia forces between theeccentrics exit member 193 of the balancingeccentric mechanism 19. - The first eccentric 191 in principle balances the centrifugal force of the
crank 113 , the balancingeccentric mechanism 19 as a whole balances the inertia forces of theneedle bar 16, ofconrod 13 and partially also the inertia forces ofthread feeder 14 mechanism. - The device for reducing vibrations of sewing machines induced by dynamic forces of the crank mechanism of
needle bar 16 and ofthread feeder 14 mechanism according to the invention creates an integral unit which can be easily built-in into an arm of thesewing machine 1 with assumption of low acquisition costs, good efficiency and reliability. It is advantageous that the centre of gravity ofexit member 193 of the balancingeccentric mechanism 19 is situated in a minimum distance from theneedle bar 16. At the same time this centre of gravity moves in a plane perpendicular to theupper shaft 11, through which a better balancing of thethread feeder 14 can be achieved. The balancing eccentric mechanism according to the invention also reduces forces exerting load to bearings of theupper shaft 11 . - It is obvious that the exemplary embodiment does not restrict the scope of protection given by the patent claims. In compliance with the claims for example the external shape of individual parts of the mechanism, type of spring elements for guiding of exit member, geometric parameters, etc. may be modified.
- 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.
-
- 1
- arm of sewing machine
- 11
- upper shaft
- 111
- belt
- 112
- belt pulley
- 113
- crank
- 114
- crank journal
- 12
- bearing
- 13
- conrod
- 14
- thread feeder
- 15
- bearing
- 16
- needle bar
- 17
- conrod (of thread feeder)
- 18
- pin
- 19
- balancing eccentric mechanism
- 191
- first eccentric
- 192
- second eccentric
- 193
- exit member (of balancing eccentric mechanism)
- 194
- flat spring
Claims (3)
- The device for reducing vibrations of sewing machines induced by dynamic forces of the crank mechanism of needle bar (16) and the thread feeder (14) mechanism, while the crank (113) of the crank mechanism of needle bar (16) and of the thread feeder mechanism (14) is attached to the upper shaft (11), which is rotatably mounted in arm (1) of the sewing machine and is coupled with the balancing device, characterised in that the the balancing device is formed by the balancing eccentric mechanism (19), which comprises in an arm (1) of the machine in a flexible and/or sliding manner mounted exit member (193), in which a cylindric hole is performed, in which is rotatably mounted the second eccentric (192), in which with eccentricity (e) the cylindric hole is performed, in which is rotatably mounted the first eccentric (191), which with eccentricity (r) is firmly connected with upper shaft (11) of the sewing machine
- The device according to the claim 1, characterised in that the eccentricity (r) of the first eccentric (191) is turned by 180° with respect to the crank (113) of the needle bar (16) crank mechanism.
- The device according to the claim 1 or 2, characterised in that the exit member (193) in arm (1) of the sewing machine is flexibly mounted between in parallel manner arranged flat springs (194), out of which each is fastened with its one end to the arm (1) of the sewing machine and with its opposite end to the exit member (193)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CZ20070642A CZ301075B6 (en) | 2007-09-14 | 2007-09-14 | Device to reduce vibrations of sewing machines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2037031A1 EP2037031A1 (en) | 2009-03-18 |
EP2037031B1 true EP2037031B1 (en) | 2010-06-30 |
Family
ID=40244012
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08466025A Expired - Fee Related EP2037031B1 (en) | 2007-09-14 | 2008-09-12 | Device for reducing vibrations of sewing machines |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2037031B1 (en) |
CZ (1) | CZ301075B6 (en) |
DE (1) | DE602008001640D1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109610104B (en) * | 2019-01-29 | 2024-03-15 | 浙江耐拓机电科技有限公司 | Template sewing machine |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4325116C1 (en) | 1993-07-27 | 1994-10-20 | Pfaff Ag G M | Sewing machine with a mass-compensating mechanism |
JPH07124361A (en) * | 1993-11-09 | 1995-05-16 | Brother Ind Ltd | Sewing machine |
JPH0838778A (en) | 1994-07-27 | 1996-02-13 | Brother Ind Ltd | Vibration preventing device for sewing machine |
JPH0871285A (en) | 1994-09-09 | 1996-03-19 | Brother Ind Ltd | Driving mechanism for sewing machine |
JPH08159153A (en) * | 1994-12-01 | 1996-06-18 | Brother Ind Ltd | Bearing device |
DE29710108U1 (en) * | 1996-06-13 | 1997-08-14 | S & W Engineering Gmbh | 1st order mass balance embroidery machine |
EP1388601A3 (en) * | 2002-08-09 | 2006-07-05 | Hashima Co., Ltd. | Sewing machine |
EP1947227A1 (en) * | 2007-01-17 | 2008-07-23 | Sunstar Precision Co., Ltd. | Sewing arm mechanism of embroidery machine |
-
2007
- 2007-09-14 CZ CZ20070642A patent/CZ301075B6/en not_active IP Right Cessation
-
2008
- 2008-09-12 DE DE602008001640T patent/DE602008001640D1/en active Active
- 2008-09-12 EP EP08466025A patent/EP2037031B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CZ301075B6 (en) | 2009-10-29 |
CZ2007642A3 (en) | 2009-03-25 |
DE602008001640D1 (en) | 2010-08-12 |
EP2037031A1 (en) | 2009-03-18 |
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