EP2138622B1 - Hook for a double backstitch sewing machine - Google Patents
Hook for a double backstitch sewing machine Download PDFInfo
- 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
Links
- 238000009958 sewing Methods 0.000 title claims description 5
- 238000006073 displacement reaction Methods 0.000 claims 1
- 238000007373 indentation Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Images
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)
Abstract
Description
Die Erfindung betrifft einen Greifer für eine Doppel-Steppstich-Nähmaschine mit einem topfförmigen Greifer-Körper mit einer in dem Greifer-Körper um eine Achse drehbar angeordneten Spulenkapsel, die einen Boden und konzentrisch zur Achse einen Lager-Zapfen aufweist.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.
Bei einem derartigen, aus der
Der Erfindung liegt die Aufgabe zugrunde, einen Greifer der allgemeinen Gattung in einfacher Weise so auszugestalten, dass Schwankungen in der Greiferfaden-Spannung weitestgehend vermieden werden.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.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruches 1 gelöst. Kern der Erfindung ist die Ausbildung eines Gleit-Lagers zwischen dem Verriegelungs-Hebel und dem zugewandten Flansch der Spule. Dieses Gleit-Lager, das durch eine ununterbrochene, gleichmäßige Ringfläche auf dem Flansch der Spule und eine entsprechende definierte Fläche am Verriegelungs-Hebel gebildet wird, hat über den gesamten Umfang der Spule gleichmäßige Reibverhältnisse. Eine in der Regel vorhandene Mitnehmer-Nut für Spul-Maschinen liegt innerhalb des Gleit-Lagers, beeinträchtigt die Reibverhältnisse also nicht.This object is achieved by the features of claim 1. 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.
Weitere vorteilhafte Ausgestaltungen ergeben sich aus den Unteransprüchen.Further advantageous embodiments will be apparent from the dependent claims.
Weitere Merkmale, Vorteile und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispieles der Erfindung anhand der Zeichnung. Es zeigt
- Fig. 1
- eine Nähmaschine in teilweise aufgebrochener schematischer Seiten-Darstellung,
- Fig. 2
- einen Greifer nach der Erfindung mit eingesetzter betriebsberei- ter Greiferfaden-Spule gemäß der Schnittlinie II-II in
Fig. 3 , - Fig. 3
- eine Draufsicht auf den Greifer nach
Fig. 2 , - Fig. 4
- einen Greifer nach
Fig. 2 mit ausgeschobener Greiferfaden- Spule gemäß der Schnittlinie IV-IV inFig. 5 , - Fig. 5
- eine Draufsicht auf den Greifer nach
Fig. 4 , - Fig. 6
- einen Längsschnitt durch eine abgewandelte Ausführungsform einer Greiferfaden-Spule,
- Fig. 7
- eine Draufsicht auf die Greiferfaden-Spule nach
Fig. 6 und - Fig. 8
- eine für die Greiferfaden-Spule nach
Fig. 6 geeignete zylindri- sche Brems- und Ausschub-Feder.
- Fig. 1
- a sewing machine in partially broken schematic side view,
- Fig. 2
- a gripper according to the invention with inserted operable looper thread bobbin according to the section line II-II in
Fig. 3 . - Fig. 3
- a plan view of the gripper to
Fig. 2 . - Fig. 4
- a gripper after
Fig. 2 with ejected looper thread bobbin according to the section line IV-IV inFig. 5 . - Fig. 5
- a plan view of the gripper to
Fig. 4 . - Fig. 6
- a longitudinal section through a modified embodiment of a looper thread bobbin,
- Fig. 7
- a plan view of the looper thread bobbin after
Fig. 6 and - Fig. 8
- one for the looper thread reel
Fig. 6 suitable cylindrical brake and extension spring.
Die in
In der Grundplatte 3 ist ein Vertikal-Greifer 8, das heißt ein um eine vertikale Achse 9 drehantreibbarer Doppel-Steppstich-Greifer 8, gelagert. Eine den Greifer 8 tragende Greifer-Antriebs-Welle 10, die um die Achse 9 antreibbar ist, ist in einem in der Grundplatte 3 angeordneten Greiferlager-Gehäuse 11 drehbar gelagert. Sie wird mittels einer Übertragungs-Welle 12 mittels eines Kegelrad-Getriebes 13 angetrieben. Die Übertragungs-Welle 12 wiederum wird mittels eines Zahnriementriebes 14 von der Armwelle 4 angetrieben. Der Zahnriementrieb 14 weist ein Übersetzungsverhältnis von 1:1 auf. Das Kegelrad-Getriebe 13 ist derart bemessen, dass ein Übersetzungsverhältnis von 1:2 realisiert ist. Dies bedeutet, dass sich der Greifer 8 zweimal dreht, wenn die Armwelle 4 beziehungsweise die Übertragungs-Welle 12 eine Umdrehung ausführt. Um dies zu realisieren, weist das an der Übertragungs-Welle 12 angebrachte große Antriebs-Kegelrad 15 die doppelte Zähnezahl auf wie das an der Greifer-Antriebs-Welle 10 angebrachte Abtriebs-Kegelrad 16.In the base plate 3, a
Oberhalb des Greifers 8 ist an der Oberseite der Grundplatte 3 eine Stichlochplatte 17 mit einem Stichloch 18 befestigt. Der Greifer 8 weist eine Greiferspitze 19 auf, die unmittelbar an der durch das Stichloch 18 eingetauchten Nadel 6 vorbeiläuft und einen in dieser geführten Nadelfaden 20 ergreifen kann. Im Greifer 8 ist eine Spulenkapsel 21 gelagert, die um die Achse 9 gegenüber dem Greifer 8 frei drehbar ist. Die Spulenkapsel 21 liegt mit einem Lager-Ringbund 22 an einem Lager-Ring 23 an, der auf dem topfförmigen Greifer-Körper 24 des Greifers 8 angebracht ist. Die Spulenkapsel 21 ist in der üblichen Weise derart gelagert, dass der von der Greiferspitze 19 erfasste Nadelfaden 20 um die Spulenkapsel 21 herumgeführt werden kann.Above the
Die Spulenkapsel 21 ist ebenfalls im Wesentlichen topfförmig ausgebildet wie den
In der Nabe 27 der Spule 26 ist eine ringzylindrische Ausnehmung 31 ausgebildet, die nach innen zum Lager-Zapfen 25 hin offen ist. In dieser Ausnehmung 31 ist eine als zylindrische Schraubenfeder ausgebildete Bremsund Ausschub-Feder 32 angeordnet, die in einer Ringnut 33 im Boden 34 der Spulenkapsel 21 abgestützt und mittels eines Ringbundes 33a gegenüber der Achse 9 zentriert ist. In der Nabe 27 der Spule 26 stützt sie sich gegen einen Anschlag 31 a ab.In the
Als Verriegelungs-Einrichtung 35 dient ein in dem hohlen Lager-Zapfen 25 schwenkbar gelagerter Verriegelungs-Hebel 36, der zwei um 90° gegeneinander versetzte Anlage-Flächen 37, 38 aufweist. Diesen Anlage-Flächen 37, 38 ist ein in einer Ausnehmung 39 des Lager-Zapfens 25 in Richtung der Achse 9 verschiebbar gelagertes Widerlager 40 zugeordnet, das von einer vorgespannten Schrauben-Druck-Feder 41 gegen eine der Anlage-Flächen 37 oder 38 gedrückt wird. An dem Widerlager 40 liegt die Anlage-Fläche 37 des Hebels 36 an, wenn dieser gegenüber der Achse 9 um etwa 90° verschwenkt ist, so dass die Spule 26 gegen die Kraft der Brems- und Ausschub-Feder 32 zum Boden 34 der Spulenkapsel 21 hin verschoben ist, wie aus
Wie aus den
Damit der Verriegelungs-Hebel 36 beim Betrieb des Greifers 8 nicht den gleichmäßigen freien Umlauf der Spule 26 beim jeweiligen Überlaufen der Mitnehmer-Nut 42 behindert, ist radial außerhalb der Mitnehmer-Nut 42 zwischen dem Verriegelungs-Hebel 36 und dem Flansch 28 der Spule 26 ein Gleit-Lager 43 ausgebildet. In verriegeltem Zustand des Hebels 36 und damit der Spule 26 in der Spulenkapsel 21 liegen somit der Hebel 36 und der obere Flansch 28 nur in einem Ringflächen-Bereich 44 des Flansches 28 und einer als Erhöhung des Hebels 36 ausgebildeten Andrückfläche 44a aneinander, wobei die stets gleiche Andrückkraft durch die zusammengedrückte zylindrische Brems- und Ausschub-Feder 32 gegeben ist. Das Reibmoment und damit das Bremsmoment zwischen dem Verriegelungs-Hebel 36 und der Greiferfaden-Spule 26 ist also auch über jeweils eine Umdrehung der Spule 26 konstant.Thus, the locking
An das Gleit-Lager 43 schließt sich radial nach außen eine Einwölbung 45 im Hebel 36 an, die als Griffmulde dient. Zum Öffnen des VerriegelungsHebels 36 aus der abgewinkelten Position gemäß
Wie aus
Die in den
Wie aus den
Claims (3)
- Hook for a double-lockstitch sewing machine, the hook comprising- a cup-shaped hook body (24);- a bobbin case (21) which is mounted in the hook body (24) for rotation about an axis (9), the bobbin case (21) comprising-- a bottom (34) and-- a bearing pin (25) which is concentric with the axis (9);- a hook thread bobbin (26, 26a) which is arranged on the bearing pin (25) for displacement in the direction of the axis (9), the hook thread bobbin (26, 26a) comprising-- two flanges (28, 29) which are spaced from each other, and-- a hollow hub (27) which is guided on the bearing pin (25) and interconnects the flanges (28, 29); and- a brake and discharge spring (32, 32a) which is arranged between the bottom (34) and the hook thread bobbin (26, 26a);- a locking device (35) comprising a locking lever (36)-- which is pivotable between an unlocked position extending approximately parallel to the axis (9) and a locked position extending approximately perpendicular thereto, the locked position abutting a facing flange (28); and- holes (47) in the flange (28) facing the locking lever (36),characterized
in that between the locking lever (36) and the facing flange (28) of the hook thread bobbin (26, 26a) is formed an annular slide bearing (43) which is continuous across its periphery, with the locking lever (36) and the hook thread bobbin (26, 26a) being pressable against one another only in the region of the slide bearing (43) when in the locked position;
in that the slide bearing (43) is formed by a continuous annular region (44, 44b) on the flange (28) of the hook thread bobbin (26, 26a) facing the locking lever (36) and a pressure surface (44a) on the locking lever (36); and
in that the continuous annular region (44, 44b) and/or the pressure surface (44a) are designed as elevations. - Hook according to claim 1, characterized
in that an entrainer groove (42) is formed in the hub (27) of the hook thread bobbin (26); and
in that the slide bearing (43) is formed radially to the axis (9) outside the entrainer groove (42). - Hook according to one of claims 1 or 2, characterized
in that the locking lever (36) comprises an indentation (45) on the side facing the adjacent flange (28) and radially to the axis (9) outside the slide bearing (43).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008030002A DE102008030002A1 (en) | 2008-06-24 | 2008-06-24 | Gripper for a double lockstitch sewing machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2138622A1 EP2138622A1 (en) | 2009-12-30 |
EP2138622B1 true EP2138622B1 (en) | 2011-01-19 |
Family
ID=41100721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09006986A Active EP2138622B1 (en) | 2008-06-24 | 2009-05-26 | Hook for a double backstitch sewing machine |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2138622B1 (en) |
JP (1) | JP3153040U (en) |
KR (1) | KR200472016Y1 (en) |
CN (1) | CN201439567U (en) |
AT (1) | ATE496158T1 (en) |
DE (2) | DE102008030002A1 (en) |
Family Cites Families (8)
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 (en) * | 1975-12-19 | 1976-05-06 | Duerkoppwerke Gmbh, 4800 Bielefeld | CONTROLLED BRAKE DEVICE FOR THE LOOP THREAD SPOOL OF A DOUBLE STEPSTITCH SEWING MACHINE |
IT1162039B (en) * | 1978-09-25 | 1987-03-18 | Necchi Spa | HOOK FOR SEWING MACHINE |
US4734967A (en) | 1986-06-02 | 1988-04-05 | Imperial Clevite Inc. | Method of heat treating bearing materials |
JPH0859489A (en) | 1994-08-22 | 1996-03-05 | Nippon Telegr & Teleph Corp <Ntt> | Freezing damage inhibitor for frozen blood |
DE19510830C2 (en) | 1995-03-24 | 2001-11-22 | Duerkopp Adler Ag | Bobbin brake for the hook thread bobbin of a lockstitch sewing machine |
-
2008
- 2008-06-24 DE DE102008030002A patent/DE102008030002A1/en not_active Withdrawn
-
2009
- 2009-05-26 EP EP09006986A patent/EP2138622B1/en active Active
- 2009-05-26 DE DE502009000308T patent/DE502009000308D1/en active Active
- 2009-05-26 AT AT09006986T patent/ATE496158T1/en active
- 2009-06-11 JP JP2009003964U patent/JP3153040U/en not_active Expired - Fee Related
- 2009-06-23 KR KR2020090008060U patent/KR200472016Y1/en not_active IP Right Cessation
- 2009-06-24 CN CN2009201534068U patent/CN201439567U/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
KR20100000192U (en) | 2010-01-06 |
CN201439567U (en) | 2010-04-21 |
DE502009000308D1 (en) | 2011-03-03 |
DE102008030002A1 (en) | 2009-12-31 |
KR200472016Y1 (en) | 2014-03-31 |
ATE496158T1 (en) | 2011-02-15 |
JP3153040U (en) | 2009-08-20 |
EP2138622A1 (en) | 2009-12-30 |
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