WO2012159746A1 - Machine à coudre pourvue d'un pince-fil - Google Patents

Machine à coudre pourvue d'un pince-fil Download PDF

Info

Publication number
WO2012159746A1
WO2012159746A1 PCT/EP2012/002186 EP2012002186W WO2012159746A1 WO 2012159746 A1 WO2012159746 A1 WO 2012159746A1 EP 2012002186 W EP2012002186 W EP 2012002186W WO 2012159746 A1 WO2012159746 A1 WO 2012159746A1
Authority
WO
WIPO (PCT)
Prior art keywords
thread
seam
clamp
thread clamp
clamping
Prior art date
Application number
PCT/EP2012/002186
Other languages
German (de)
English (en)
Inventor
Manfred Thomas
Original Assignee
Pfaff Industriesysteme Und Maschinen 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 Pfaff Industriesysteme Und Maschinen Ag filed Critical Pfaff Industriesysteme Und Maschinen Ag
Priority to EP12729344.7A priority Critical patent/EP2714979B1/fr
Publication of WO2012159746A1 publication Critical patent/WO2012159746A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D05B65/02—Devices for severing the needle or lower thread controlled by the sewing mechanisms
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B63/00—Devices associated with the loop-taker thread, e.g. for tensioning

Definitions

  • the invention relates to seam forming means for a sewing machine, comprising thread guide means, such as a needle and / or a gripper, for guiding at least one thread provided for seaming, and a thread clamping device which is provided with a thread clamp, in particular for the formation of a seam beginning a thread can be inserted, clamped and re-executed. Moreover, the invention relates to a sewing machine provided with such seaming means.
  • Sewing machines form using an oscillating reciprocating needle that guides a thread. Seams. Chain stitch sewing machines use only one thread.
  • the needle feeds a needle thread which is entangled with a bobbin thread supply for a bobbin thread for the lockstitch seam.
  • the coil is in this case in a revolving gripper, which performs relative to the coil rotational movement, detected at each stitch of the needle into the fabric the upper thread and devoured with the lower thread.
  • the invention is therefore based on the object to provide a measure by which an improvement in terms of a reliable seam formation can be achieved even at the beginning of a sewing process.
  • This object is achieved with seam forming means of the type mentioned according to the invention by an operable thread clamp (29) which is closed by means of a controllable actuating means for clamping and / or by means of the actuating means.
  • an operable thread clamp (29) which is closed by means of a controllable actuating means for clamping and / or by means of the actuating means.
  • the inventively provided controlled thread clamp which can be closed at a certain time of the sewing process for thread take-up or -klemmung by actuation, allows for each sewing reproducible conditions and thus a reliable seaming, especially between a lower and a needle thread.
  • the inventively provided thread clamp should u can be opened at a certain time to release the thread, so that the thread is also released at a certain time.
  • opening must not only be understood to mean an active separation of the clamping parts of the thread clamp, whereby they are spaced apart from each other.
  • Opening in the sense of the present invention may also be a removal or reduction of the clamping applied to the thread clamp for clamping Load on the actuating means to be understood.
  • An opening in the context of the invention is therefore already at a release of the thread clamp by an actuating means, which is sufficient to be able to bring out the previously not removable from the thread clamp thread now in particular by the sewing process from the thread clamp.
  • an inventive thread clamp can be provided with advantage as a lower thread clamp, as it can be used in connection with lockstitch sewing machines.
  • it is within the scope of the invention underlying idea to form a thread clamp according to the characterizing part of claim 1 also for an upper thread of the needle, either for an upper thread of a lockstitch or a chain stitch sewing machine.
  • a suitable possible embodiment of an operable thread clamp of the seam-forming means according to the invention may comprise at least two clamping parts, of which at least one is designed to be movable.
  • the two clamping parts can preferably be brought from a position (opening position) in which they are spaced apart in a position (closing and clamping position) in which the clamping parts are pressed against each other and vice versa. In the closing and clamping position, the clamping parts are able to clamp a thread between them.
  • at least one of the two movements, namely the transfer of the clamping parts in the opening position or the closing and clamping position is carried out by a driven movement which can be generated by a drive means.
  • the opening movement and / or the closing movement may be a movement driven by a drive means.
  • opening position and positions of the two clamping parts come into consideration, in which they indeed abut against each other but can be opened by a brought up to the thread clamp thread.
  • drive means of actuating means of the thread clamp come in a non-exhaustive list, for example, pneumatic actuators, electric drives or magnets into consideration. If only one of the two movements is designed as a driven movement, the respective other of the two movements can advantageously be configured as a return movement, which is generated against the action of a return element, such as a spring element, which is tensioned in one of the two movements.
  • a return element such as a spring element
  • the time at which the thread clamp is closed for clamping the thread by a control of the thread clamp predetermined or can be predeterminable by this.
  • the opening time or an opening movement of an actuating means of the thread clamp provided for this purpose by the controller is predetermined or predeterminable.
  • the controller may be a central sewing machine controller. This makes it particularly easy to coordinate the movements of the thread clamp on movements of other sewing machine components and coordinate with them. So it may be to achieve a high reliability of advantage if the thread is already inserted and clamped in the controlled thread clamp during the end of the previous sewing operation. This has the advantage that the thread is still in a sewing process and thus present for the clamping reproducible conditions.
  • the thread cut in the embodiment of the invention discussed here Only after the thread has been inserted into the clamp is the thread cut in the embodiment of the invention discussed here.
  • a thread cutting device for cutting the thread can advantageously be provided a thread cutting device, as described for example in DE 10 2008 030 620 B3.
  • the thread remains clamped even after completion of the sewing process in the thread clamp and is thereby arranged and clamped at the beginning of each subsequent sewing process in a particularly simple manner already in the targeted and predetermined operable thread clamp.
  • the closing operation can be derived with advantage from a cutting operation performed by the thread cutting device.
  • the clamping operation can thus be triggered in the cutting process, which is usually triggered by an operator of the sewing machine, by pressing a button or a switch.
  • the clamping operation of the thread is thus advantageously carried out first by receiving the thread in the thread clamp and only then by the cutting operation.
  • at least the time of opening or the release of the thread clamp - and thus the release of the thread - can be variably adjusted.
  • Such adjustability may be advantageously provided depending on an adjustable predetermined number of first stitches of a sewing operation. This makes it possible to reduce the duration of the Clamping until the thread clamp is opened again and releases the thread to adjust to the given sewing conditions, such as the type of thread used, the material of the fabric and its thickness.
  • Fig. 1 is a lockstitch sewing machine in a partially cut
  • FIG. 2 shows an assembly "gripper device” of the sewing machine from FIG. 1 in FIG.
  • Fig. 3 shows a possible example of parts of a thread cutting device
  • Fig. 4 is a controlled and actuatable thread clamping device of
  • Sewing machine in a perspective view, wherein the thread clamp is not operated but closed;
  • FIG. 5 shows the thread clamping device of Figure 4 with a non-actuated but open thread clamp ..
  • Fig. 6 shows the assembly "gripper device" with shown lower thread after the
  • FIG. 7 shows the situation from FIG. 6, shown from a different angle
  • FIG. 8 shows the subassembly "gripper device” with shown lower thread after cutting the lower thread and with the lower thread in the thread clamp
  • Fig. 9 shows the situation of Fig. 8, shown from a different angle.
  • the housing 1 has a lower housing-shaped so-called base plate 2, from which a stand 3 extends substantially vertically upwards. At an upper end of the stator, an arm 4 connects, which runs approximately parallel to the base plate 2.
  • the sewing machine has an arm shaft 7, which is mounted in the arm 4 and, as well as the other basic components of the sewing machine mentioned below, are possibly only partly or highly schematically represented in FIG.
  • the arm shaft 7 drives an oscillating up and down movable needle bar 5, to the needle holder, a needle 6 for receiving an upper thread (not shown) can be attached.
  • a gripper device 8 is arranged, whose rotational movement is synchronized with the oscillating movement of the needle bar 5.
  • a lower thread is located on a coil 1 1, which is arranged in a multi-part bobbin case carrier.
  • the gripper device 8 guides the upper thread guided by the needle 6 around the bobbin case carrier in a manner known per se so that it can form a seam together with the bobbin thread.
  • the needle bar 5 and the gripper device 8 are driven by a common drive, namely a servo electric motor, not shown, whose rotary drive movement is tapped to the needle bar 5 and the gripper device 8 from a machine main shaft and translated in a certain ratio.
  • the sewing machine also has a non-illustrated feeding device with a needle and / or top feed device. Accordingly, the also driven by a corresponding gear from the machine main shaft feeders for the passage of the needle 6 is provided with a stitch hole.
  • 2 shows an illustration of the assembly of the gripper device 8 arranged in the base plate 2, which is located in the base plate immediately below a throat plate 9 (FIG. 1).
  • the gripper device 8 has a rotatable in a horizontal plane gripper 12, which is provided with a hook tip 12a and in the known manner, the thread supply receiving coil 11 is inserted.
  • the coil 1 1 is also secured in a known manner against rotational movements. As can be seen in Fig. 2 and Figs.
  • the gripper device 8 is provided with a thread cutting device 13, which is provided for detecting and for the separation of the lower and the upper thread. After completion of a seam formation, the thread cutting device 13 can be used either automatically or by actuation of an arranged on or in the vicinity of the sewing machine actuating means.
  • the thread cutting device 13 may be formed, for example, according to DE 10 2008 030 620 B3, the content of which, in particular with regard to the structural design and achievable functions, is hereby incorporated by reference.
  • the thread cutting device 13 shown by way of example and purely schematically in FIG. 3 has a thread catcher 14, which is arranged on a shaft 15 which is directed parallel to the gripper shaft and is oscillatable about it over a certain angular range in mutually opposite directions of rotation.
  • the thread cutting device 13 receives its drive movement from the machine main shaft to the shaft 15 via a corresponding gear.
  • the thread catcher 14 is located in its rest position laterally behind the needle 6 and is for a cutting operation in a horizontal plane from the rest position along a running between the stitch hole 13 and the side wall of the gripper path of movement in the movement reversal position and from this along the same trajectory again can be returned to the rest position.
  • a catcher tip 17 is formed on this, which is arranged downstream of a barb.
  • an incision 21 is formed on the outer side surface of the thread catcher, which is arranged downstream of the catcher tip 17.
  • the thread catcher On its upper side, the thread catcher for receiving the threads to be separated on a catcher tip 17 downstream groove 23, which opens at one end into the recess 21 and the other end in a thread catcher 14 passing through bore 24.
  • the end region of the groove 23 merging into the bore 24 forms a semicircular cutting edge 25 of the catch catcher 14.
  • a stationary counter knife 26 cooperating with the thread catcher 14 is provided in the immediate area of the stitch mark the cutting edge 27 is directed to achieve a pulling cut at an acute angle to the feed direction of the material.
  • the counter knife 26 can also be arranged on the underside of a feed dog of the sewing machine and be firmly connected thereto.
  • a thread clamping device 28 is located in the immediate vicinity of the thread cutting device 13 in the region of the circumference of the gripper 12 (FIGS. 2 and 6-9). With regard to the direction of rotation of the gripper, the thread clamping device is arranged directly behind the thread cutting device.
  • the thread clamping device 28 has a thread clamp 29, which is provided with two cooperating clamping parts 30, 31.
  • the upper clamping member 30 is in this case arranged rigidly on a carrier 32 and projects beak-like and curved away from the carrier 32.
  • the lower clamping part 31 is formed angularly and is located immediately below the upper clamping member 30.
  • the lower clamping member 31 also has a beak-like and approximately to the gripper curved course of a substantially horizontal clamping leg 31 a.
  • the lower clamping part 31 is pivoted on the carrier by means of a shaft 33, the pivot axis 33a is oriented horizontally.
  • the shaft 33 is in this case held in a manner not shown in detail in FIGS. 4 and 5 by the carrier 32.
  • the lower clamping member 31 is force-loaded with a spring, also not shown. The direction of action and spring force of the spring is provided so that the lower clamping member 31 with a force only slightly exceeding its own force against the upper Clamping part 30 is pressed.
  • a screw 35 is screwed below the shaft 33 in the vertical leg of the lower clamping part and this also passed through the carrier 32.
  • the screw 35 protrudes with its screw head 35a on the side remote from the lower clamping part 31 side of the carrier 32 at a distance from the latter.
  • the threaded other end of the screw protrudes from the vertical clamping leg 31 b of the lower clamping member 31 out, in which case a nut 35 b is screwed onto the end of the screw, which rests against the vertical clamping leg 31 b.
  • a pneumatic flat cylinder 36 is also attached by screwing. In Fig. 2, a pneumatic connection of the cylinder can be seen at the rear end of the flat cylinder.
  • the free end of the piston 38 of the pneumatic cylinder 37 is located directly opposite the screw head 35a, wherein a longitudinal axis of the stroke movement of the piston 38 and the longitudinal axis of the screw 35 are parallel to each other.
  • a stroke movement of the piston 38 this comes into abutment against the screw head 35a and moves it in the direction of the carrier 32 to.
  • the lower clamping member 31 performs a rotational movement about the pivot axis 33a of the shaft 33, whereby the lower clamping member 31 is pressed against the upper clamping member 30 with a greater force than can exert the spring.
  • clamping surfaces of the clamping parts 30, 31 can be profiled in cross-section, in particular triangular in shape, resulting in particularly good clamping effects with comparatively low clamping forces required.
  • the operation of the described seam forming means of the sewing machine is as follows:
  • a knotting stitch is first formed in a known manner in the sewing material, which serves to secure the seam against being pulled on.
  • a knotting stitch can be made with the stitch length "zero" and, for example, in the manner described in DE 10 2008 030 620 B3. If the position of the sewing material continues to be unchanged during the formation of a partial stitch (cutting stitch), the needle thread loop widened by the gripper 12, after which the thread catcher 14 is moved from a laterally located behind the needle rest position along a nikbogenfönmigen trajectory in a motion reversal position. This movement takes place in the illustrations of Fig. 2 and 6-9 in the counterclockwise direction. The thread catcher penetrates with the catcher tip 17 in the expanded needle thread loop, detects them and leads them away.
  • the lower thread 40 is still clamped in the thread clamp 29 and, as shown, for example, in FIGS. 8 and 9, is guided by the spool 1 1 over it to the thread clamp 29.
  • the piston 38 continues to press against the screw head 35a at the beginning of this seaming, as a result of which the lower thread 40 in the thread clamp 29 is held securely.
  • the new sewing process can be started, whereby the needle 6 cooperate in a conventional manner with the gripper 12 and can produce one or more stitches of the seam to be formed from the beginning process reliable.
  • the number of stitches during which the thread clamp 29 continues to clamp the lower thread 40 can preferably be adjusted via the controller.
  • the control of the sewing machine controls the flat cylinder 36 so that the piston 38 moves back and the lower clamping part 31 of the thread clamp 29 is released from the piston.
  • the lower thread can hereby be led out of the thread clamp 29 due to the thread tension and the continuous sewing process and the seam can be formed from now on without thread clamping.
  • At the end of this seam formation can be introduced by pressing a switch or button for the thread cutting process or by an automatic triggering of the thread cutting operation of the lower thread in the manner already described again in the thread clamp 29 and clamped there and cut.
  • Needle bar 31 a horizontal clamping leg

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

Abstract

L'invention concerne des moyens de formation de couture pour une machine à coudre, comprenant des moyens de guidage du fil, comme par exemple une aiguille et/ou un crochet, pour guider au moins un fil servant à former la couture, ainsi qu'un dispositif pince-fil pourvu d'un pince-fil (29) dans lequel un fil peut être introduit, pincé et ressorti, en particulier pour former un début de couture. L'objectif de l'invention est d'accroître la fiabilité de la formation de couture également au début du processus de couture. À cet effet, les moyens de formation de couture selon l'invention comprennent un pince-fil (29) actionnable qui peut être fermé en position de pincement par l'intermédiaire d'un moyen d'actionnement commandable et/ou qui peut être ouvert à l'aide dudit moyen d'actionnement.
PCT/EP2012/002186 2011-05-23 2012-05-23 Machine à coudre pourvue d'un pince-fil WO2012159746A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12729344.7A EP2714979B1 (fr) 2011-05-23 2012-05-23 Machine à coudre pourvue d'un pince-fil

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011102928.5 2011-05-23
DE201110102928 DE102011102928A1 (de) 2011-05-23 2011-05-23 Nähmaschine mit Fadenklemmme

Publications (1)

Publication Number Publication Date
WO2012159746A1 true WO2012159746A1 (fr) 2012-11-29

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ID=46354136

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/002186 WO2012159746A1 (fr) 2011-05-23 2012-05-23 Machine à coudre pourvue d'un pince-fil

Country Status (3)

Country Link
EP (1) EP2714979B1 (fr)
DE (1) DE102011102928A1 (fr)
WO (1) WO2012159746A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107245819B (zh) * 2017-07-04 2020-02-04 杰克缝纫机股份有限公司 缝纫机自动剪线控制装置及方法
DE102021128687A1 (de) * 2021-11-04 2023-05-04 Bundesdruckerei Gmbh Klemmvorrichtung für einen Hinter- oder Unterfaden einer Nähmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3173393A (en) * 1961-12-13 1965-03-16 Pfaff Ag G M Thread cutting mechanism for lockstitch sewing machines
US3599588A (en) * 1969-04-26 1971-08-17 Pfaff Ag G M Thread-carrying looptaker for chain stitch sewing machines with thread catcher and clamping device
DE2344720A1 (de) * 1973-09-05 1975-04-03 Pfaff Ind Masch Fadenschneid-einrichtung an stickmaschinen
DE19722395C1 (de) * 1997-05-28 1998-08-06 Pfaff Ag G M Nähmaschine mit einer Fadenschneideinrichtung
DE102007045598A1 (de) * 2006-09-15 2008-03-27 Juki Corp., Chofu Nähmaschine
DE102008030620B3 (de) 2008-06-24 2009-12-24 Pfaff Industrie Maschinen Ag Verfahren und Vorrichtung zum Durchtrennen des Nadel- und des Greiferfadens an Doppelsteppstich-Nähmaschinen mit in einer horizontalen Ebene umlaufendem Greifer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3173393A (en) * 1961-12-13 1965-03-16 Pfaff Ag G M Thread cutting mechanism for lockstitch sewing machines
US3599588A (en) * 1969-04-26 1971-08-17 Pfaff Ag G M Thread-carrying looptaker for chain stitch sewing machines with thread catcher and clamping device
DE2344720A1 (de) * 1973-09-05 1975-04-03 Pfaff Ind Masch Fadenschneid-einrichtung an stickmaschinen
DE19722395C1 (de) * 1997-05-28 1998-08-06 Pfaff Ag G M Nähmaschine mit einer Fadenschneideinrichtung
DE102007045598A1 (de) * 2006-09-15 2008-03-27 Juki Corp., Chofu Nähmaschine
DE102008030620B3 (de) 2008-06-24 2009-12-24 Pfaff Industrie Maschinen Ag Verfahren und Vorrichtung zum Durchtrennen des Nadel- und des Greiferfadens an Doppelsteppstich-Nähmaschinen mit in einer horizontalen Ebene umlaufendem Greifer

Also Published As

Publication number Publication date
EP2714979B1 (fr) 2016-12-28
DE102011102928A1 (de) 2012-11-29
EP2714979A1 (fr) 2014-04-09

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