EP2138622B1 - Greifer für eine Doppel-Steppstich-Nähmaschine - Google Patents

Greifer für eine Doppel-Steppstich-Nähmaschine Download PDF

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Publication number
EP2138622B1
EP2138622B1 EP09006986A EP09006986A EP2138622B1 EP 2138622 B1 EP2138622 B1 EP 2138622B1 EP 09006986 A EP09006986 A EP 09006986A EP 09006986 A EP09006986 A EP 09006986A EP 2138622 B1 EP2138622 B1 EP 2138622B1
Authority
EP
European Patent Office
Prior art keywords
hook
axis
locking lever
bobbin
flange
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.)
Active
Application number
EP09006986A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2138622A1 (de
Inventor
Christoph Heckner
Alexander Penner
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.)
Duerkopp Adler AG
Original Assignee
Duerkopp Adler 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 Duerkopp Adler AG filed Critical Duerkopp Adler AG
Publication of EP2138622A1 publication Critical patent/EP2138622A1/de
Application granted granted Critical
Publication of EP2138622B1 publication Critical patent/EP2138622B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/26—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices
    • D05B57/265—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices for looptakers with vertical axis
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/26—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
    • D05B57/10—Shuttles
    • D05B57/14—Shuttles with rotary hooks

Definitions

  • the invention relates to a gripper for a double-lockstitch sewing machine with a cup-shaped gripper body with a in the gripper body about an axis rotatably mounted bobbin case, which has a bottom and concentric with the axis of a bearing pin.
  • a locking device which has a locking lever which is pivotable between an approximately parallel to the axis extending unlocked position and an approximately perpendicular thereto extending locked position, wherein in the locked position serving as a braking device ball is pressed radially outward against the inside of the hub of the coil, whereby a brake device is provided.
  • a locking lever which is pivotable between an approximately parallel to the axis extending unlocked position and an approximately perpendicular thereto extending locked position, wherein in the locked position serving as a braking device ball is pressed radially outward against the inside of the hub of the coil, whereby a brake device is provided.
  • the invention has for its object to design a gripper of the general genus in a simple manner so that fluctuations in the looper thread tension are largely avoided.
  • the core of the invention is the formation of a sliding bearing between the locking lever and the facing flange of the coil.
  • This sliding bearing which is formed by a continuous, uniform annular surface on the flange of the coil and a corresponding defined surface on the locking lever, has uniform friction conditions over the entire circumference of the coil.
  • a generally existing driver groove for winding machines lies within the sliding bearing, so does not affect the friction conditions.
  • Fig. 1 illustrated double lockstitch sewing machine has in a conventional manner an upper arm 1, a vertical stand 2 and a lower housing-like base plate 3.
  • an arm shaft 4 is mounted, via which a needle bar 5 with needle 6 up and down driven. Furthermore, a thread lever 7 is driven by it.
  • a vertical gripper 8 that is a about a vertical axis 9 rotatably driven double lockstitch gripper 8, stored.
  • a gripper drive shaft 10 carrying the gripper 8, which can be driven about the axis 9, is rotatably mounted in a gripper bearing housing 11 arranged in the base plate 3. It is driven by means of a transmission shaft 12 by means of a bevel gear 13.
  • the transmission shaft 12, in turn, is driven by the arm shaft 4 by means of a toothed belt drive 14.
  • the toothed belt drive 14 has a transmission ratio of 1: 1.
  • the bevel gear 13 is dimensioned such that a gear ratio of 1: 2 is realized. This means that the gripper 8 rotates twice when the arm shaft 4 and the transmission shaft 12 makes one revolution.
  • the attached to the transmission shaft 12 large drive bevel gear 15 has the double the number of teeth on the as attached to the gripper drive shaft 10 output bevel gear 16th
  • a tap hole plate 17 with a tap hole 18 is attached to the top of the base plate 3.
  • the gripper 8 has a gripper tip 19, which passes directly to the immersed by the needle hole 18 needle 6 and can take a guided in this needle thread 20.
  • a bobbin case 21 is mounted, which is freely rotatable about the axis 9 relative to the gripper 8.
  • the bobbin case 21 abuts with a bearing collar 22 on a bearing ring 23 which is mounted on the cup-shaped gripper body 24 of the gripper 8.
  • the bobbin case 21 is mounted in the usual manner such that the needle thread 20 grasped by the hook tip 19 can be guided around the bobbin case 21.
  • the bobbin case 21 is also substantially cup-shaped like the Fig. 2 to 4 is removable. It has concentric with the central longitudinal axis 9 of the gripper drive shaft 10 and the gripper 8, which is also its own axis, a hollow bearing pin 25 which receives a looper thread spool 26. This has a hollow hub 27 and an upper flange 28 and a lower flange 29 in a known manner.
  • the coil 26 is provided after removal from the bobbin case 21 with a supply of looper thread 30 and then inserted into the bobbin case 21.
  • a ring-cylindrical recess 31 is formed, which is open to the bearing journal 25 inwardly.
  • this recess 31 designed as a cylindrical coil spring brake and Ausschub spring 32 is arranged, which is supported in an annular groove 33 in the bottom 34 of the bobbin case 21 and by means of a ring collar 33a opposite the axis 9 is centered.
  • the hub 27 of the coil 26 it is supported against a stop 31 a from.
  • locking means 35 is a pivotally mounted in the hollow bearing pin 25 locking lever 36 which has two mutually offset by 90 ° abutment surfaces 37, 38.
  • abutment surfaces 37, 38 is associated with a bearing in a recess 39 of the bearing pin 25 in the direction of the axis 9 slidably mounted abutment 40 which is pressed by a prestressed helical compression spring 41 against one of the abutment surfaces 37 or 38 ,
  • the abutment surface 37 of the lever 36 abuts when it is pivoted about the axis 9 by about 90 °, so that the coil 26 against the force of the brake and Ausschub spring 32 to the bottom 34 of the bobbin 21st is postponed, how out Fig.
  • the recess 31 extends from the lower flange 29 in the direction of the upper flange 28 over about a quarter of the extension of the coil 26 in the direction of the axis 8.
  • the recess 31 may also be up to half of this axial extent take, in particular, when the gap between the lower flange 29 and bottom 34 is reduced.
  • the spool 26 in the region of its upper flange 28, namely on the hub 27, a so-called cam groove 42 which is necessary so that the spool 26 can be rotated in a winding machine for winding a rapier thread 30.
  • this driver groove 42 engages a driver of the winding machine to ensure a positive rotary drive.
  • the locking lever 36 during operation of the gripper 8 does not obstruct the smooth free circulation of the spool 26 at the respective overflow of the cam groove 42 is radially outwardly of the cam groove 42 between the locking lever 36 and the flange 28 of the coil 26th a sliding bearing 43 is formed.
  • the lever 36 and thus the coil 26 in the bobbin case 21 are thus the lever 36 and the upper flange 28 only in an annular surface area 44 of the flange 28 and formed as an increase of the lever 36 pressing surface 44a together, the always same pressing force is given by the compressed cylindrical brake and Ausschub spring 32.
  • the friction torque and thus the braking torque between the locking lever 36 and the looper thread bobbin 26 is therefore also constant over one revolution of the bobbin 26.
  • Fig. 3 and 5 it can be seen, extending outside the annular surface area 44 in a relatively dense sequence extending radially short to the outer edge 46 of the flange 28 elongated holes 47, which are distributed uniformly over the circumference. They extend to the hub 27, but not to the annular surface area 44 of the flange 28. These slots 47 allow a very accurate observation of the supply of looper thread 30. Furthermore, the mass and thus the moment of inertia of the coil 26 is reduced.
  • the in the 6 and 7 shown looper thread bobbin 26 a has a groove 31 formed as an annular recess b, into which a brake and Ausschub spring 32 a can engage, as shown in Fig. 8, while in the Fig. 2 and 4 shown brake and Ausschub spring 32 has turns 48, which have the same diameter throughout, the brake and Ausschub spring 32a in the lowermost region one or two windings 48a of reduced diameter, so that they can be centered on the annular collar 33a Although the remaining turns 48 have an enlarged diameter, since the recess 31 b due to their design as an annular groove over the Fig. 2 and 4 having enlarged diameter.
  • the embodiment according to the 6 and 7 has the advantage that despite the annular recess 31 b for the brake and Ausschub spring 32 a, the full guide length of the hook thread bobbin 26 a on the bearing pin 25 of the bobbin case 21 is maintained.
  • the sliding bearing 43 can be configured in such a manner that the annular surface portion 44b is formed as an elevation on the upper flange 28 of the looper thread bobbin 26a.
  • the pressing surface 44a may be formed on the lock lever 36, but this is not necessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP09006986A 2008-06-24 2009-05-26 Greifer für eine Doppel-Steppstich-Nähmaschine Active EP2138622B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008030002A DE102008030002A1 (de) 2008-06-24 2008-06-24 Greifer für eine Doppel-Steppstich-Nähmaschine

Publications (2)

Publication Number Publication Date
EP2138622A1 EP2138622A1 (de) 2009-12-30
EP2138622B1 true EP2138622B1 (de) 2011-01-19

Family

ID=41100721

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09006986A Active EP2138622B1 (de) 2008-06-24 2009-05-26 Greifer für eine Doppel-Steppstich-Nähmaschine

Country Status (6)

Country Link
EP (1) EP2138622B1 (zh)
JP (1) JP3153040U (zh)
KR (1) KR200472016Y1 (zh)
CN (1) CN201439567U (zh)
AT (1) ATE496158T1 (zh)
DE (2) DE102008030002A1 (zh)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1218220A (en) * 1915-12-13 1917-03-06 Victor Shoe Machinery Co Shuttle for sewing-machines.
GB533245A (en) * 1939-10-21 1941-02-10 Singer Mfg Co Sewing machine bobbin-cases
US3476068A (en) * 1967-08-15 1969-11-04 Miracle Hook Corp Sewing hook and bobbin
DE7540565U (de) * 1975-12-19 1976-05-06 Duerkoppwerke Gmbh, 4800 Bielefeld Gesteuerte bremsvorrichtung fuer die greiferfadenspule einer doppelsteppstichnaehmaschine
IT1162039B (it) * 1978-09-25 1987-03-18 Necchi Spa Gancio per macchina per cucire
US4734967A (en) 1986-06-02 1988-04-05 Imperial Clevite Inc. Method of heat treating bearing materials
JPH0859489A (ja) 1994-08-22 1996-03-05 Nippon Telegr & Teleph Corp <Ntt> 凍結血液用凍害防止剤
DE19510830C2 (de) 1995-03-24 2001-11-22 Duerkopp Adler Ag Spulenbremse für die Greiferfaden-Spule einer Doppelsteppstich-Nähmaschine

Also Published As

Publication number Publication date
KR20100000192U (ko) 2010-01-06
CN201439567U (zh) 2010-04-21
DE502009000308D1 (de) 2011-03-03
DE102008030002A1 (de) 2009-12-31
KR200472016Y1 (ko) 2014-03-31
ATE496158T1 (de) 2011-02-15
JP3153040U (ja) 2009-08-20
EP2138622A1 (de) 2009-12-30

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