EP3875652B1 - Blind stitch sewing machine with thread cutter - Google Patents

Blind stitch sewing machine with thread cutter Download PDF

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Publication number
EP3875652B1
EP3875652B1 EP20161287.6A EP20161287A EP3875652B1 EP 3875652 B1 EP3875652 B1 EP 3875652B1 EP 20161287 A EP20161287 A EP 20161287A EP 3875652 B1 EP3875652 B1 EP 3875652B1
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EP
European Patent Office
Prior art keywords
thread
needle
catcher
sewing machine
gripper
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Application number
EP20161287.6A
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German (de)
French (fr)
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EP3875652A1 (en
Inventor
Michael Rosemann
Kostyantyn BEZRODNY
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Strobel Spezialmaschinen GmbH
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Strobel Spezialmaschinen GmbH
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Priority to EP20161287.6A priority Critical patent/EP3875652B1/en
Priority to PT201612876T priority patent/PT3875652T/en
Publication of EP3875652A1 publication Critical patent/EP3875652A1/en
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Publication of EP3875652B1 publication Critical patent/EP3875652B1/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B1/00—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both
    • D05B1/24—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making blind-stitch seams
    • 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

Definitions

  • the present invention relates to a blindstitch sewing machine, namely a two-thread lockstitch blindstitch sewing machine, according to the preamble of patent claim 1.
  • the blind stitch sewing machine is used to create a blind stitch that connects a sewing material formed from at least two sewing materials with one another in such a way that the seam is not visible on the upper side, ie the side of the sewing material that is visible from the outside.
  • a curved needle is used to create a blind stitch seam.
  • the blind stitch technique has a very long tradition, as is the state of the art according to GB 02771 A AD 1914 and GB 121 702 A indicates.
  • the EP 1 182 287 A2 shows a blind stitch sewing device.
  • this prior art involves single-thread chainstitch blindstitch sewing machines.
  • the material to be sewn has at least two sewing materials, namely an upper material and at least one lower material, with an inner lining fabric being sewn on blindly as part of the textile outer clothing, for example.
  • An additional label to be sewn on, for example, can be considered as a further sub-material.
  • the material When used for seat covers in vehicle seats, the material is formed from an upper material, for example leather, which is coated with a foam layer as the lower material.
  • a cover tacking element is to be sewn onto this foam layer with a blind stitch seam without piercing the upper material layer, which is made in particular of leather, and serves to permanently connect the cover of the vehicle seat to the seat structure of the vehicle seat.
  • the present invention is therefore based on the object of creating a thread trimmer for a blindstitch sewing machine in the form of a two-thread double lockstitch blindstitch sewing machine that allows the two threads to be cut off in a controlled manner, with the previously existing mechanical design for producing the double lockstitch blindstitch being essentially retained target.
  • the present invention is characterized in that a thread cutter is provided in a two-thread lockstitch blindstitch sewing machine, which has a thread catcher which is able and set up to take hold of both the needle thread and the bobbin thread and feed them to a cutting device.
  • the sewing process can advantageously also be significantly shortened in terms of time, because the sewing person no longer has to cut the threads himself, which takes up a considerable amount of time.
  • the length of the bobbin thread in particular can be reduced to a minimum, which results in the advantage of lower consumption of the bobbin thread and thus also an increase in productivity, because the bobbin thread only has to be replaced after a longer time interval.
  • the thread catcher dips at least partially into a gripper space, which extends in the direction of rotation of the gripper between a gripper tip and a gripper back of the gripper in order to grip the needle thread and the bobbin thread there.
  • This enables the two threads to be gripped in a very space-saving and effective manner.
  • the movement of the thread catcher is synchronized with the movement of the gripper in such a way that collisions between the thread catcher and the gripper are ruled out. This ensures safe operation of the thread trimmer.
  • Safe operation of the thread catcher also ensures that the synchronization between the gripper movement and thread catcher movement by a cam mechanism is ensured, so that the thread cutting process can advantageously be carried out without stopping the gripper movement.
  • the thread catcher has catching devices that are capable of grasping both the needle and the bobbin thread by immersing the thread catcher into the hook space by subsequently withdrawing the thread catcher from the hook space in the form of thread loops and in the direction of the cutting device pull out of the looper space.
  • the thread catcher advantageously has a catch hook for the bobbin thread, a catch hook for the front run of the needle thread, a thread channel and a cutting edge, and a front thread guide for the needle thread and bobbin thread.
  • a very effective configuration of the thread catcher is thus achieved, with the thread catcher participating in the cutting of the two threads itself by means of the cutting edge.
  • the thread catcher can also be referred to as a thread pulling knife .
  • the movement of the thread catcher of the thread cutter is controlled by means of a scanning device which, for the process of thread cutting, can be brought into contact with a control cam rotating synchronously with the gripper, preferably by means of a scanning roller, which controls the movement of the thread catcher and with which Synchronized gripper movement.
  • a scanning device which, for the process of thread cutting, can be brought into contact with a control cam rotating synchronously with the gripper, preferably by means of a scanning roller, which controls the movement of the thread catcher and with which Synchronized gripper movement.
  • the scanning device advantageously also has a transmission between the thread catcher and the control cam, which is designed as an intermediate lever that can be pivoted about an axis of rotation with a scanning roller that is in contact can be brought to the control cam revolving synchronously with the gripper and in turn can be brought into contact with the follower roller of the thread catcher.
  • the thread catcher performs a rapid retraction movement, which is generated by a steep rise curve section in the control cam.
  • the thread catcher is moved out of the gripper area in the shortest possible time by this steep rise curve section and a collision with the approaching gripper tip is avoided.
  • the thread catcher performs a rapid retraction movement in that it is withdrawn from the peripheral area of the gripper in a period of time that is less than the time that the gripper needs for a rotation angle of essentially 40°, whereby a Collision with the hook tip is avoided.
  • the movement of the thread catcher in the direction of a counter knife of the cutting device is slowed down or brought to a standstill after the rapid retraction movement but before the cutting process, in order to delay the time of the cutting process until the thread puller or thread lever is in the vicinity has reached its top dead center so that the needle thread does not become too short. This is the only way to achieve a safe seam beginning for the next seam.
  • the slowed movement of the thread catcher takes place through a detent position in the cam, which is formed by a cam section of the cam that has a substantially constant cam diameter.
  • a movement of the thread catcher is essentially or completely prevented during the rotation of the control cam together with the gripper.
  • the thread catcher is advantageously designed in an arc shape and executes a pivoting movement about an axis of rotation.
  • the thread catcher can also be designed in a straight line and performs a substantially linear movement.
  • the thread catcher is designed as a thread-pulling knife, with a cutting edge for both the needle thread and the bobbin thread, which, when the thread catcher is retracted, moves past a counter-knife of the cutting device, causing the two threads to be severed.
  • the length of the bobbin thread, measured from the bobbin case after cutting, is at least 20 mm and the length of the needle thread, measured from the needle when the needle lever is in its top dead center position, is at least 45 mm. This ensures that sewing is guaranteed in a next sewing process. For example, there is no risk of the needle thread being pulled out of the eyelet of the bent needle. There is also the advantage that the bobbin thread is securely gripped when it is first pierced.
  • a front thread guide is preferably designed in the form of a notch in the upper side of the thread catcher or thread-pulling knife in the area of the tip and the cutting edge of the thread catcher. The two threads to be cut are thus reliably fed to the cutting edge and a corresponding cutting of both threads is ensured when the thread catcher moves past the counter-knife.
  • the bobbin case has a bobbin thread tensioning spring on its periphery, which is provided with an indentation for receiving the bobbin thread, the indentation in the upper ( 7 ) or front (in the installed position) section of the tension spring is arranged. This enables the bobbin thread to be securely gripped by the thread catcher because the bobbin thread is then safely brought to the front side of the thread catcher and can thus be caught by the catch hook.
  • the thread tension of the needle thread is released at the latest from the last third of the rapid retraction movement of the thread catcher, as a result of which the thread catcher is able to draw enough needle thread with a sufficiently small force to pull from a needle thread supply.
  • a sufficiently small force means that the needle thread is pulled along without great tensile force, which prevents the needle thread from being torn off.
  • the process of thread trimming is required at the end of the created seam.
  • the control cam which is attached to the shaft of the hook and rotates with it, must be able to rotate freely and without contact with the thread catcher during sewing.
  • the thread catcher is advantageously pressed against the cam with at least one actuator for the cutting process and its movement is controlled according to the contour of the cam.
  • the thread catcher for the thread trimming process is activated by means of a first actuator in the form of a first drive cylinder via a first piston and by means of a second actuator in the form of a second drive cylinder via a second piston in such a way that the thread catcher is attached to the Control curve is pressed and its movement is controlled according to the contour of the control curve.
  • the drive cylinders can be pneumatic cylinders, for example, with one of the two drive cylinders being used to place the thread catcher against the control cam with a sufficiently small force via the two scanning rollers and the other drive cylinder being used to push the thread catcher past the counter-knife from its rest position into its operating position .
  • the blind stitch sewing machine 1 has a sewing machine housing 3 which includes a sewing machine housing upper arm 4, a sewing machine housing fabric support arm 6 and a sewing head 5 which is attached to the sewing machine housing upper arm 4 is attached.
  • a main shaft 9 driven by a drive motor 7 extends along the upper arm 4 and supports a drive gear 13 outside the upper arm 4 which meshes with a drive gear 15 of the sewing head 5 and is adapted to drive a drive shaft 14 of the sewing head 5 .
  • Drive gear 13 and drive gear 15 form a drive gear 11.
  • the main shaft 9 is connected via a toothed belt 37 to a material flexor shaft 35 which serves to drive a material flexor 12 .
  • a material flexor shaft 35 which serves to drive a material flexor 12 .
  • the depth of penetration of the bent needle 10 into the suture material can be adjusted by adjusting the top dead center position of the fabric bender.
  • the drive shaft 14 of the sewing head 5 serves to drive a needle lever 25 on which a curved needle 10 ( 9 ) is mounted by means of a needle holder 27.
  • the needle lever 25 is mounted pivotably about a needle lever axis 26, the rotational movement of the drive shaft 14 of the sewing head 5 being converted into a reciprocating movement of the needle lever 25 via an eccentric 19 by means of a connecting rod 21 which is connected to the needle lever 25.
  • the connecting rod 21 is mounted on the eccentric 19 by means of a rotary bearing 22 .
  • the main shaft 9 also serves to drive a gripper 31, with the power being transmitted via a gear wheel 17 on the drive shaft 14.
  • the gripper drive is not shown in detail.
  • the gripper 31 rotates twice about its axis of rotation for each complete needle stroke.
  • a cover 29 is provided for the gripper drive.
  • a thread tensioning device 49 is provided, with which the thread tension can be adjusted or released again.
  • the blind stitch sewing machine 1 also has a sewing material transport device 45, the task of which is to transport the sewing material or sewing material further by a preselected stitch length after each stitch that is produced. This can vary depending on your preference take place in the sewing direction or in the opposite direction. If a created seam is overstitched over a certain section in the opposite direction, a particularly good locking of the seam at the seam end is achieved. The beginning of the seam can also be locked using the same procedure.
  • FIG.2 the gripper 31 can be seen more clearly, having a gripper tip 32 and a gripper back 34.
  • FIG. There is a gripper space between the gripper tip 32 and the gripper back.
  • the gripper 31 extends around a bobbin case 36 in which is received a thread spool 33 in which a supply of bobbin thread is received.
  • the bobbin housing 36 has two projections 56 and 58, between which there is a free space which serves to connect a projection of a gripper bridge 38 ( figure 5 and 9 ) cooperate to prevent the spool housing 36 from rotating. This is because, in order to pull off the bobbin thread from the bobbin 33, which rotates within the bobbin case 36, the exit opening for the bobbin thread in the bobbin case must always be fixed in position.
  • the hook 31 rotates at high speed around the outside of the bobbin housing 36.
  • a thread cutter 61 according to the invention can also be seen.
  • This has a thread catcher 63 which has a curved shape and interacts with a cutting device 67 which has a counter-knife 69 .
  • the thread cutter 61 will be described in more detail below.
  • An actuator 65 or two separate actuators are provided for actuating the thread cutter 61, the two drive cylinders, a first drive cylinder 103 and a second drive cylinder 105, which are acted upon by compressed air via a pneumatic supply 71 for thread cutting.
  • FIG. 3 This shows contrary to the view according to 2 , which shows the hook 31 with the thread cutter 61 from the front, a rear view of the hook 31 and the thread cutter 61.
  • the hook is driven by a hook shaft 30 (see also Fig.4 ) driven, according to 3 in front of the rapier 31, in 2 So behind the gripper 31, a cam 87 is provided which is arranged in a rotationally fixed manner on the gripper shaft 30 and thus rotates together with the gripper 31 .
  • the thread catcher 63 includes a pivoting lever 64 which is mounted pivotably about an axis of rotation 79 .
  • a follower roller 66 is arranged on the pivoting lever 64 laterally next to the axis of rotation 79 , which in turn interacts with a follower roller 83 of an intermediate lever 81 which is rotatably mounted about an axis of rotation 85 .
  • the follower roller 83 of the intermediate lever 81 can be brought into contact with the control cam 87 and when following this curve during the rotation of the gripper, its outer contour is transferred to the follower roller 66 and a corresponding pivoting of the thread catcher 63 is produced.
  • control cam has a specific outer contour, for example with a steeply rising curve section 88.
  • This steeply rising curve section 88 causes the follower roller 83 to move up very quickly and clearly, and thus also the pivoting lever 64 to move up accordingly, as a result of which the thread catcher 63 is pulled back very quickly from the hook space .
  • the interposition of the intermediate lever 81 with the follower roller 83 between the cam 87 and the follower roller 66 is mainly due to the fact that the thread trimmer 61 has to be designed as small as possible so that the cam 87 does not become so large that it collides with the needle plate 28.
  • the thread catcher 63 has a tip 99 to which a front section of the thread catcher 63 connects.
  • the thread catcher 63 has a catch hook 89 for the bobbin thread 97 and the front run of the needle thread 93 in the forward movement of the thread catcher 63, a catch hook (91) for the bobbin thread (97) and the front run of the needle thread (93) in the reverse movement, a thread channel (92) and a cutting edge (101), as well as a front thread guide (102) for needle thread and bobbin thread (97).
  • the tip 99 pushes the rear strand of the needle thread loop pulled up by the hook 31 backwards and the front strand forwards, so that the front strand of the needle thread can be caught with the catch hook 91 .
  • a thread channel 92 which extends in the direction of the tip 99 and ends in a cutting edge 101 .
  • the cutting edge 101 is used together with a counter-knife 69 of the cutting device 67 to cut both the bobbin winding and the needle thread when the thread catcher 63 on the counter-knife 69 of the cutting device 67 moves back into its rest position.
  • the thread cutter 61 is shown in a position just before the cutting of both the bobbin thread and the needle thread, the throat plate 28 also being shown with the gripper bridge 38 which prevents the bobbin housing 36 from rotating in position.
  • both threads run in the area of the tip 99 over a front thread guide 102, which is designed, for example, in the form of a notch.
  • Both the needle thread and the bobbin thread have each formed a thread loop as a result of being pulled out by means of the thread catcher 63 .
  • the needle thread and the bobbin thread are separated, so advantageously sufficiently long thread ends remain, which allow problem-free sewing on of the next sewing material.
  • the bobbin housing 36 in which the thread bobbin 33 is located, is shown in a perspective view.
  • a thread tensioning device for the bobbin thread is shown at 107, which has an indentation 109 at the front end, which is located in the upper or front area of the thread tensioning device 107 and serves to guide the bobbin thread.
  • the thread trimmer 61 is shown, together with an actuator 65, the task of which is to move the thread trimmer 61 from its rest position to its working position, in which it dips into the looper area and the bobbin and catches and pulls out the needle thread.
  • the actuator 65 is divided into two sub-actuators with a first working or drive cylinder 103 and a second working or drive cylinder 105.
  • the first drive cylinder 103 has a first piston 104 and the second drive cylinder 105 has a second piston 106. Both pistons are used to rest against the swivel lever 64.
  • the first drive cylinder 103 and the second drive cylinder 105 are controlled by means of pneumatics, with 8 a pneumatic supply 71 is shown.
  • the operation of the two drive cylinders 103 and 105 is as follows: the first piston 104 presses the thread cutter 61 downwards so that the follower roller 83 comes into contact with the cam 87 .
  • the second drive cylinder 105 supports the first drive cylinder 103 with a small stroke in order to pivot the thread catcher 63 out of its rest position. If both cylinders 103, 105 are pressurized with compressed air, the thread catcher 63 dives cam-controlled into the gripper area in order to pull out the two threads.
  • FIG. 9 shows on an enlarged scale a section of the sewing machine head 5 in the area of the hook 31, the needle lever 25, the fabric bender 12 and the sewing material transport device 45.
  • the bent needle 10 is particularly clearly visible, which is clamped in the needle holder 27 of the needle lever 25.
  • the needle lever 25 is mounted via bearing journals 113 through which the needle lever axis 26 is formed. In 9 only the right bearing pin 113 can be seen.
  • the fabric bender 12 can be clearly seen, which in this position is raised into the needle plate 28 and would bend up a corresponding sewing material (not shown) into which the bent needle 10 pierces. left and A sewing material transport device 45 is arranged to the right of the fabric bender 12, which is designed here by way of example in the form of circulating belts. Alternative embodiments are known from the prior art.
  • a corresponding covering of the sewing head 5 is not shown in the figures.
  • the present invention thus provides a two-thread blindstitch double-lockstitch blindstitch sewing machine which, for the first time, has a thread trimmer capable of safely trimming both bobbin thread and needle thread in a controlled manner, with no significant modification to the components of the sewing machine head to produce the lockstitch blindstitch seam had to be made.
  • This has the great advantage that the constructive design of the components for producing the double lockstitch blindstitch seam, which has been tried and tested for decades, could essentially be retained.
  • the sewing machine according to the invention is outstandingly suitable for use in automated production.

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

Description

Die vorliegende Erfindung betrifft eine Blindstichnähmaschine und zwar eine Zweifaden-Doppelsteppstich-Blindstichnähmaschine, nach dem Oberbegriff des Patentanspruchs 1.The present invention relates to a blindstitch sewing machine, namely a two-thread lockstitch blindstitch sewing machine, according to the preamble of patent claim 1.

Die erfindungsgemäße Blindstichnähmaschine dient dazu, einen Blindstich zu erzeugen, der ein aus wenigstens zwei Nähematerialien gebildetes Nähgut so miteinander verbindet, dass die Naht auf der Oberseite, also der von außen sichtbaren Seite des Nähguts, nicht sichtbar ist. Dies erfordert, dass die für die Naht verwendete Nadel das Nähgut nicht bis zu dessen Oberseite durchsticht. Entsprechend wird für die Erzeugung einer Blindstichnaht eine gebogene Nadel verwendet. Die Blindstichtechnik hat schon eine sehr lange Tradition, wie der Stand der Technik gemäß GB 02771 A A.D. 1914 und GB 121 702 A zeigt. Auch die EP 1 182 287 A2 zeigt eine Blindstichnähvorrichtung. Allerdings handelt es sich bei diesem Stand der Technik um Einfaden-Kettenstich-Blindstichnähmaschinen.The blind stitch sewing machine according to the invention is used to create a blind stitch that connects a sewing material formed from at least two sewing materials with one another in such a way that the seam is not visible on the upper side, ie the side of the sewing material that is visible from the outside. This requires that the needle used for the seam does not pierce the fabric to the top of the fabric. Accordingly, a curved needle is used to create a blind stitch seam. The blind stitch technique has a very long tradition, as is the state of the art according to GB 02771 A AD 1914 and GB 121 702 A indicates. Also the EP 1 182 287 A2 shows a blind stitch sewing device. However, this prior art involves single-thread chainstitch blindstitch sewing machines.

Das zu nähende Nähgut weist wenigstens zwei Nähematerialien, nämlich ein Obermaterial und wenigstens ein Untermaterial auf, wobei im Rahmen der textilen Oberbekleidung beispielsweise ein Futter-Innenstoff blind angenäht wird. Als weiteres Untermaterial kommt beispielsweise ein zusätzlich anzunähendes Etikett in Betracht.The material to be sewn has at least two sewing materials, namely an upper material and at least one lower material, with an inner lining fabric being sewn on blindly as part of the textile outer clothing, for example. An additional label to be sewn on, for example, can be considered as a further sub-material.

Im Einsatz für Sitzbezüge bei Fahrzeugsitzen ist das Material gebildet aus einem Obermaterial, beispielsweise aus Leder, das mit einer Schaumstoffschicht als Untermaterial beschichtet ist.When used for seat covers in vehicle seats, the material is formed from an upper material, for example leather, which is coated with a foam layer as the lower material.

An diese Schaumstoffschicht soll, ohne Durchstechen der Obermaterialschicht, die insbesondere aus Leder gebildet ist, ein Bezugsabheftungselement mit einer Blindstichnaht angenäht werden, das dazu dient, den Bezug des Fahrzeugsitzes nachhaltig mit der Sitzstruktur des Fahrzeugsitzes zu verbinden.A cover tacking element is to be sewn onto this foam layer with a blind stitch seam without piercing the upper material layer, which is made in particular of leather, and serves to permanently connect the cover of the vehicle seat to the seat structure of the vehicle seat.

Der Einsatz von Einfaden-Kettenstich-Blindstichnähmaschinen hat den großen Nachteil, dass diese Naht beispielsweise bei Fadenbruch sich wieder vollständig auflöst, sodass die Naht anschließend nicht mehr existiert. Der Einsatz dieser Nähtechnik bei Fahrzeugsitzbezügen hat sich deshalb nicht bewährt. Eine Zweifaden-Steppstich-Blindstich-Naht weist diesen Nachteil nicht auf. Deshalb wird der Einsatz von Zweifaden-Doppelsteppstich-Blindstichnähmaschinen für diesen Anwendungszweck gefordert.The use of single-thread chainstitch blindstitch sewing machines has the major disadvantage that this seam dissolves completely again, for example if the thread breaks, so that the seam then no longer exists. The use of this sewing technique for vehicle seat covers has therefore not proven itself. A two-thread lockstitch blindstitch seam does not have this disadvantage. Therefore, the use of two-thread lockstitch blindstitch sewing machines is required for this application.

Derartige Maschinen sind seit vielen Jahrzehnten bekannt. Heutige Anforderungen an den Einsatz dieser Maschinen umfassen die gesteuerte Möglichkeit des Fadenabschneidens der beiden Fäden, wobei jedoch, obwohl derartige Nähmaschinen seit vielen Jahrzehnten existieren, es bisher nicht gelungen ist, entsprechende Fadenabschneider für diesen Nähmaschinentyp zu verwirklichen.Such machines have been known for many decades. Today's requirements for the use of these machines include the controlled possibility of thread cutting of the two threads, although although such sewing machines have existed for many decades, it has not yet been possible to implement appropriate thread cutters for this type of sewing machine.

Dies dokumentiert auch der Stand der Technik: Die DE 20 2016 104 320 U1 und die DE 10 2007 045 598 A1 zeigen zwar Fadenabschneider bei Doppelsteppstich-Nähmaschinen, diese weisen jedoch die klassische Bauart mit Oberfaden und Unterfaden auf, wobei mit einer geraden Nadel zu jeder Stichbildung das zu nähende Material durchstochen wird. Diese Nähmaschinen sind somit für den oben genannten Einsatzzweck unbrauchbar. Die US 4 054 099 A zeigt einen Fadenabschneider, jedoch für eine Einfaden-Kettenstich-Blindstichnähmaschine.This is also documented by the state of the art: The DE 20 2016 104 320 U1 and the DE 10 2007 045 598 A1 show thread trimmers in lockstitch sewing machines, but these have the classic design with upper thread and lower thread, with a straight needle piercing the material to be sewn for each stitch formation. These sewing machines are therefore unusable for the purpose mentioned above. the U.S. 4,054,099A shows a thread cutter, but for a single-thread chainstitch blindstitch sewing machine.

Der vorliegenden Erfindung liegt deshalb die Aufgabe zugrunde, einen Fadenabschneider für eine Blindstichnähmaschine in Form einer Zweifaden-Doppelsteppstich-Blindstichnähmaschine zu schaffen, der ein Abschneiden der beiden Fäden gesteuert ermöglicht, wobei die bisher existierende maschinelle Ausgestaltung zur Erzeugung des Doppelsteppstich-Blindstichs im Wesentlichen beibehalten werden soll.The present invention is therefore based on the object of creating a thread trimmer for a blindstitch sewing machine in the form of a two-thread double lockstitch blindstitch sewing machine that allows the two threads to be cut off in a controlled manner, with the previously existing mechanical design for producing the double lockstitch blindstitch being essentially retained target.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is solved by the features of patent claim 1.

Eine Zweifaden-Doppelsteppstich-Blindstichnähmaschine ist grundsätzlich ausgerüstet

  • mit einem Antriebsmotor, der einen Nadelhebel oszillierend um eine Nadelhebelachse antreibt, an dem eine gebogene Nadel befestigt ist, durch die sich im Betrieb der Blindstichnähmaschine der Nadelfaden erstreckt,
  • mit einem Doppelsteppstich-Greifer, der bei jedem vollständigen Nadelhub aus Hin- und Rückweg des Nadelhebels zweifach umläuft und der ein Spulengehäuse lagert, in dem ein Spulenfadenvorrat aufgenommen ist, der bevorzugt auf eine Fadenspule aufgewickelt ist,
  • mit einem Stoffbeuger, der intermittierend und synchron zur Nadelbewegung das Nähgut in Richtung Nadelhebelachse hebt, wobei die Tiefe des Nadeleinstichs der gebogenen Nadel in die Dicke des Obermaterials durch Einstellung der oberen Totlage des Stoffbeugers einstellbar ist,
  • mit einer Nähguttransporteinrichtung, die dazu eingerichtet ist, das Nähgut beim Nähen zwischen zwei Stichen um eine wählbare Stichlänge in Nahtrichtung vorwärts oder rückwärts zu transportieren,
  • mit einem Fadenhebel, der die erforderliche Länge des Nadelfadens vorgibt, die für jeden Umlauf einer Nadelfadenschlinge um das Spulengehäuse erforderlich ist, und der diese vorgegebene Fadenlänge für einen Fadenanzug nach jedem Umlauf der Nadelfadenschlinge wieder zurückzieht,
  • mit einer Fadenspannungsvorrichtung für den Nadelfaden,
  • mit einer Fadenspannungsvorrichtung für den Spulenfaden, und
  • mit einer Stichplatte, die eine Oberseite und eine Unterseite aufweist, wobei sich das Nähgut und der Stoffbeuger im Wesentlichen auf der Unterseite der Stichplatte befinden, während sich der Greifer sowie die gebogene Nadel auf der Oberseite der Stichplatte befinden.
A two-thread lockstitch blindstitch sewing machine is basically equipped
  • with a drive motor which drives a needle lever in an oscillating manner about a needle lever axis, to which a curved needle is attached, through which the needle thread extends when the blind stitch sewing machine is in operation,
  • with a lockstitch gripper, which rotates twice with each complete needle stroke from the forward and backward travel of the needle lever and which supports a bobbin housing in which a bobbin thread supply is accommodated, which is preferably wound onto a thread bobbin,
  • with a fabric bender, which lifts the sewing material in the direction of the needle lever axis intermittently and synchronously with the needle movement, the depth of the needle penetration of the bent needle in the thickness of the upper material being adjustable by adjusting the upper dead point of the fabric bender,
  • with a sewing material transport device which is set up to transport the sewing material forwards or backwards by a selectable stitch length in the direction of the seam when sewing between two stitches,
  • with a thread lever, which specifies the required length of the needle thread, which is required for each revolution of a needle thread loop around the bobbin case, and which retracts this specified thread length for a thread tightening after each revolution of the needle thread loop,
  • with a thread tensioning device for the needle thread,
  • with a thread tension device for the bobbin thread, and
  • with a throat plate having an upper side and a lower side, wherein the material to be sewn and the fabric bender are essentially located on the lower side of the throat plate, while the looper and the curved needle are located on the upper side of the throat plate.

Die vorliegende Erfindung zeichnet sich dadurch aus, dass bei einer Zweifaden-Doppelsteppstich-Blindstichnähmaschine ein Fadenabschneider vorgesehen ist, der einen Fadenfänger aufweist, welcher in der Lage und dazu eingerichtet ist, sowohl den Nadelfaden als auch den Spulenfaden zu ergreifen und einer Schneideinrichtung zuzuführen.The present invention is characterized in that a thread cutter is provided in a two-thread lockstitch blindstitch sewing machine, which has a thread catcher which is able and set up to take hold of both the needle thread and the bobbin thread and feed them to a cutting device.

Damit wird ein seit Jahrzehnten bestehendes Bedürfnis befriedigt, einen Fadenabschneider bei Zweifaden-Doppelsteppstich-Blindstichnähmaschinen zu schaffen, mit dem gesteuert ein Abschneiden der beiden Fäden ermöglicht wird, wodurch derartige Zweifaden-Doppelsteppstich-Blindstichnähmaschinen sich insbesondere für einen Einsatz in einer automatisierten Massenproduktion eignen.This satisfies a need that has existed for decades to create a thread cutter for two-thread double lockstitch blindstitch sewing machines, with which the two threads can be cut off in a controlled manner, making such two-thread double lockstitch blindstitch sewing machines particularly suitable for use in automated mass production.

Durch den Einsatz des erfindungsgemäßen Fadenabschneiders kann vorteilhafterweise der Nähvorgang zeitlich auch deutlich verkürzt werden, weil die nähende Person das Abschneiden der Fäden selbst nicht mehr vornehmen muss, was einen erheblichen Zeitaufwand benötigt.By using the thread cutter according to the invention, the sewing process can advantageously also be significantly shortened in terms of time, because the sewing person no longer has to cut the threads himself, which takes up a considerable amount of time.

Zudem kann sichergestellt werden, dass beim Annähen des nächsten Teils ausreichend Faden vorhanden ist, dieses Annähen erfolgreich durchzuführen. Auch hierdurch wird die Produktivität des Nähvorgangs erhöht.In addition, it can be ensured that when the next part is sewn on, there is sufficient thread to carry out this sewing on successfully. This also increases the productivity of the sewing process.

Andererseits kann die Länge insbesondere des Spulenfadens auf ein Minimum verkürzt werden, was den Vorteil eines geringeren Verbrauchs des Spulenfadens ergibt und damit auch eine Produktivitätssteigerung erfolgt, weil ein Auswechseln der Fadenspule erst nach einem längeren Zeitintervall erfolgen muss.On the other hand, the length of the bobbin thread in particular can be reduced to a minimum, which results in the advantage of lower consumption of the bobbin thread and thus also an increase in productivity, because the bobbin thread only has to be replaced after a longer time interval.

Vorteilhafterweise taucht der Fadenfänger zumindest teilweise in einen Greiferraum ein, der sich in Drehrichtung des Greifers zwischen einer Greiferspitze und einem Greiferrücken des Greifers erstreckt, um dort den Nadelfaden und den Spulenfaden zu ergreifen. Damit wird ein sehr platzsparendes und wirksames Ergreifen der beiden Fäden ermöglicht.Advantageously, the thread catcher dips at least partially into a gripper space, which extends in the direction of rotation of the gripper between a gripper tip and a gripper back of the gripper in order to grip the needle thread and the bobbin thread there. This enables the two threads to be gripped in a very space-saving and effective manner.

Weiterhin ist es vorteilhaft, dass die Bewegung des Fadenfängers mit der Bewegung des Greifers so synchronisiert ist, dass Kollisionen zwischen Fadenfänger und Greifer ausgeschlossen sind. Dies sorgt für eine sichere Betriebsweise des Fadenabschneiders.Furthermore, it is advantageous that the movement of the thread catcher is synchronized with the movement of the gripper in such a way that collisions between the thread catcher and the gripper are ruled out. This ensures safe operation of the thread trimmer.

Für eine sichere Betriebsweise des Fadenfängers sorgt weiterhin, dass die Synchronisierung zwischen Greiferbewegung und Fadenfängerbewegung durch ein Kurvengetriebe sichergestellt wird, so dass der Fadenabschneidprozess vorteilhafterweise ohne Anhalten der Greiferbewegung durchgeführt werden kann.Safe operation of the thread catcher also ensures that the synchronization between the gripper movement and thread catcher movement by a cam mechanism is ensured, so that the thread cutting process can advantageously be carried out without stopping the gripper movement.

Vorteilhafterweise weist der Fadenfänger Fangvorrichtungen auf, die in der Lage sind, sowohl den Nadel- als auch den Spulenfaden durch das Eintauchen des Fadenfängers in den Greiferraum durch das anschließende Zurückziehen des Fadenfängers aus dem Greiferraum in Form von Fadenschlaufen zu erfassen und in Richtung der Schneideinrichtung aus dem Greiferraum herauszuziehen.Advantageously, the thread catcher has catching devices that are capable of grasping both the needle and the bobbin thread by immersing the thread catcher into the hook space by subsequently withdrawing the thread catcher from the hook space in the form of thread loops and in the direction of the cutting device pull out of the looper space.

Vorteilhafterweise weist der Fadenfänger einen Fanghaken für den Spulenfaden, einen Fanghaken für das vordere Trumm des Nadelfadens, einen Fadenkanal und eine Schneidkante auf, sowie eine vordere Fadenführung für Nadelfaden und Spulenfaden. Damit wird eine sehr wirksame Ausgestaltung des Fadenfängers erreicht, wobei mittels der Schneidkante der Fadenfänger am Abschneiden der beiden Fäden selbst teilnimmt. In dieser Ausgestaltung kann man den Fadenfänger auch als Fadenziehmesser bezeichnen.The thread catcher advantageously has a catch hook for the bobbin thread, a catch hook for the front run of the needle thread, a thread channel and a cutting edge, and a front thread guide for the needle thread and bobbin thread. A very effective configuration of the thread catcher is thus achieved, with the thread catcher participating in the cutting of the two threads itself by means of the cutting edge. In this embodiment, the thread catcher can also be referred to as a thread pulling knife .

Weiterhin ist vorteilhaft, dass die Steuerung der Bewegung des Fadenfängers des Fadenabschneiders mittels einer Abtastvorrichtung erfolgt, die für den Vorgang des Fadenabschneidens bevorzugt mittels einer Abtastrolle in Anlage an einer synchron mit dem Greifer umlaufenden Steuerkurve bringbar ist, welche die Bewegung des Fadenfängers steuert und mit der Bewegung des Greifers synchronisiert. Dadurch wird eine feste mechanische Verbindung geschaffen und die Bewegung des Fadenfängers derart gesteuert, dass Kollisionen zwischen Fadenfänger und Greifer sicher vermieden werden können.It is also advantageous that the movement of the thread catcher of the thread cutter is controlled by means of a scanning device which, for the process of thread cutting, can be brought into contact with a control cam rotating synchronously with the gripper, preferably by means of a scanning roller, which controls the movement of the thread catcher and with which Synchronized gripper movement. This creates a firm mechanical connection and controls the movement of the thread catcher in such a way that collisions between the thread catcher and the gripper can be reliably avoided.

Um den zusätzlichen Einbau des erfindungsgemäßen Fadenabschneiders in eine Zweifaden-Doppelsteppstich-Blindstichnähmaschine ohne wesentliche Änderungen der für die Sticherzeugung notwendigen Komponenten zu erreichen, sollte die auf die Greiferwelle aufgesetzte Steuerkurve in ihrem Außenumfang nicht größer als der Greifer sein. Deshalb weist vorteilhafterweise die Abtastvorrichtung weiterhin ein Getriebe zwischen Fadenfänger und Steuerkurve auf, das als ein um eine Drehachse schwenkbarer Zwischenhebel mit einer Abtastrolle ausgeführt ist, die in Anlage an die synchron mit dem Greifer umlaufende Steuerkurve bringbar ist und ihrerseits mit der Abtastrolle des Fadenfängers in Kontakt bringbar ist.In order to achieve the additional installation of the thread trimmer according to the invention in a two-thread double lockstitch blindstitch sewing machine without significant changes to the components required for stitch production, the external circumference of the control cam placed on the hook shaft should not be larger than the hook. Therefore, the scanning device advantageously also has a transmission between the thread catcher and the control cam, which is designed as an intermediate lever that can be pivoted about an axis of rotation with a scanning roller that is in contact can be brought to the control cam revolving synchronously with the gripper and in turn can be brought into contact with the follower roller of the thread catcher.

Vorteilhafterweise führt der Fadenfänger eine schnelle Rückzugsbewegung aus, die durch einen Steilanstiegskurvenabschnitt in der Steuerkurve erzeugt wird. Durch diesen Steilanstiegskurvenabschnitt wird der Fadenfänger in kürzester Zeit aus dem Greiferraum heraus bewegt und eine Kollision mit der nahenden Greiferspitze vermieden.Advantageously, the thread catcher performs a rapid retraction movement, which is generated by a steep rise curve section in the control cam. The thread catcher is moved out of the gripper area in the shortest possible time by this steep rise curve section and a collision with the approaching gripper tip is avoided.

Weiterhin ist es vorteilhaft, dass der Fadenfänger eine schnelle Rückzugsbewegung dadurch ausführt, dass er in einer Zeitspanne, die kleiner ist als die Zeit, die der Greifer für einen Drehwinkel von im Wesentlichen 40° benötigt, aus dem Umfangsbereich des Greifers zurückgezogen wird, wodurch eine Kollision mit der Greiferspitze vermieden wird.Furthermore, it is advantageous that the thread catcher performs a rapid retraction movement in that it is withdrawn from the peripheral area of the gripper in a period of time that is less than the time that the gripper needs for a rotation angle of essentially 40°, whereby a Collision with the hook tip is avoided.

Weiterhin ist es zudem vorteilhaft, dass die Bewegung des Fadenfängers in Richtung eines Gegenmessers der Schneideinrichtung nach der schnellen Rückzugsbewegung aber vor dem Abschneidvorgang verlangsamt oder zum Stillstand gebracht wird, um den Zeitpunkt des Abschneidvorgangs so lange zu verzögern, bis der Fadenzieher oder Fadenhebel in die Nähe seines oberen Totpunktes gelangt ist, damit der Nadelfaden nicht zu kurz wird. Nur so kann ein sicherer Nahtanfang für die nächste Naht erreicht werden.Furthermore, it is also advantageous that the movement of the thread catcher in the direction of a counter knife of the cutting device is slowed down or brought to a standstill after the rapid retraction movement but before the cutting process, in order to delay the time of the cutting process until the thread puller or thread lever is in the vicinity has reached its top dead center so that the needle thread does not become too short. This is the only way to achieve a safe seam beginning for the next seam.

In diesem Zusammenhang ist vorteilhaft, dass die verlangsamte Bewegung des Fadenfängers durch eine Raststellung in der Steuerkurve erfolgt, die durch einen Kurvenabschnitt der Steuerkurve gebildet wird, der einen im Wesentlichen konstanten Kurvendurchmesser aufweist. Dadurch wird während des Drehens der Steuerkurve zusammen mit dem Greifer eine Bewegung des Fadenfängers im Wesentlichen oder vollständig unterbunden.In this context, it is advantageous that the slowed movement of the thread catcher takes place through a detent position in the cam, which is formed by a cam section of the cam that has a substantially constant cam diameter. As a result, a movement of the thread catcher is essentially or completely prevented during the rotation of the control cam together with the gripper.

Mit Vorteil ist der Fadenfänger bogenförmig ausgebildet und führt eine Schwenkbewegung um eine Drehachse aus. In alternativen Ausgestaltungen kann der Fadenfänger auch geradlinig ausgebildet sein und führt eine im Wesentlichen lineare Bewegung aus.The thread catcher is advantageously designed in an arc shape and executes a pivoting movement about an axis of rotation. In alternative configurations, the thread catcher can also be designed in a straight line and performs a substantially linear movement.

Weiterhin ist vorteilhaft, dass der Fadenfänger als Fadenziehmesser ausgebildet ist, wobei er eine Schneidkante sowohl für den Nadelfaden als auch für den Spulenfaden aufweist, die bei einer Rückzugsbewegung des Fadenfängers sich an einem Gegenmesser der Schneideinrichtung vorbei bewegt, wodurch das Durchtrennen beider Fäden bewirkt wird.It is also advantageous that the thread catcher is designed as a thread-pulling knife, with a cutting edge for both the needle thread and the bobbin thread, which, when the thread catcher is retracted, moves past a counter-knife of the cutting device, causing the two threads to be severed.

Ein weiterer Vorteil ergibt sich dadurch, dass die Länge des Spulenfadens vom Spulengehäuse aus gemessen nach dem Abschneiden mindestens 20 mm beträgt und die Länge des Nadelfadens von der Nadel ausgemessen bei Stellung des Nadelhebels in seinem oberen Totpunkt, mindestens 45 mm beträgt. Dadurch wird sichergestellt, dass ein Annähen in einem nächsten Nähvorgang gewährleistet ist. Es besteht beispielsweise keine Gefahr, dass der Nadelfaden aus der Öse der gebogenen Nadel herausgezogen wird. Weiterhin besteht der Vorteil, dass der Spulenfaden beim ersten Anstechen sicher ergriffen wird.Another advantage is that the length of the bobbin thread, measured from the bobbin case after cutting, is at least 20 mm and the length of the needle thread, measured from the needle when the needle lever is in its top dead center position, is at least 45 mm. This ensures that sewing is guaranteed in a next sewing process. For example, there is no risk of the needle thread being pulled out of the eyelet of the bent needle. There is also the advantage that the bobbin thread is securely gripped when it is first pierced.

Weiterhin ist vorteilhaft, dass eine vordere Fadenführung bevorzugt in der Form einer Einkerbung in der Oberseite des Fadenfängers bzw. Fadenziehmessers im Bereich der Spitze und der Schneidkante des Fadenfängers ausgebildet ist. Damit werden die beiden abzuschneidenden Fäden sicher der Schneidkante zugeführt und ein entsprechendes Durchtrennen beider Fäden bei Vorbeibewegen des Fadenfängers an dem Gegenmesser sichergestellt.Furthermore, it is advantageous that a front thread guide is preferably designed in the form of a notch in the upper side of the thread catcher or thread-pulling knife in the area of the tip and the cutting edge of the thread catcher. The two threads to be cut are thus reliably fed to the cutting edge and a corresponding cutting of both threads is ensured when the thread catcher moves past the counter-knife.

Weiterhin es vorteilhaft, dass das Spulengehäuse eine Spulenfaden-Spannungsfeder an ihrem Umfang aufweist, die mit einer Einbuchtung versehen ist, die zur Aufnahme des Spulenfadens dient, wobei die Einbuchtung im oberen (Fig. 7) bzw. vorderen (in Einbaulage) Abschnitt der Spannungsfeder angeordnet ist. Dadurch wird ein sicheres Ergreifen des Spulenfadens durch den Fadenfänger ermöglicht, weil dadurch der Spulenfaden sicher auf der vorderen Seite des Fadenfängers verbracht wird und so von dem Fanghaken erfasst werden kann.Furthermore, it is advantageous that the bobbin case has a bobbin thread tensioning spring on its periphery, which is provided with an indentation for receiving the bobbin thread, the indentation in the upper ( 7 ) or front (in the installed position) section of the tension spring is arranged. This enables the bobbin thread to be securely gripped by the thread catcher because the bobbin thread is then safely brought to the front side of the thread catcher and can thus be caught by the catch hook.

Mit Vorteil wird die Fadenspannung des Nadelfadens spätestens ab dem letzten Drittel der schnellen Rückzugsbewegung des Fadenfängers gelöst, wodurch der Fadenfänger in die Lage versetzt wird, mit hinreichend kleiner Kraft ausreichend Nadelfaden aus einem Nadelfadenvorrat zu ziehen. Mit hinreichend kleiner Kraft bedeutet in diesem Fall, dass das Nachziehen des Nadelfadens ohne große Zugkraft erfolgt, wodurch ein Abreißendes Nadelfadens vermieden wird.Advantageously, the thread tension of the needle thread is released at the latest from the last third of the rapid retraction movement of the thread catcher, as a result of which the thread catcher is able to draw enough needle thread with a sufficiently small force to pull from a needle thread supply. In this case, a sufficiently small force means that the needle thread is pulled along without great tensile force, which prevents the needle thread from being torn off.

Der Vorgang des Fadenabschneidens wird am Ende der erzeugten Naht benötigt. Die Steuerkurve, die auf der Welle des Greifers angebracht ist und sich mit diesem dreht, muss während des Nähens frei und ohne Kontakt zu dem Fadenfänger umlaufen können. Um den Abschneidvorgang in Aktion zu setzen wird der Fadenfänger vorteilhafterweise mit mindestens einem Aktuator für den Abschneidvorgang an die Steuerkurve gedrückt und dessen Bewegung entsprechend der Kontur der Steuerkurve gesteuert.The process of thread trimming is required at the end of the created seam. The control cam, which is attached to the shaft of the hook and rotates with it, must be able to rotate freely and without contact with the thread catcher during sewing. In order to put the cutting process into action, the thread catcher is advantageously pressed against the cam with at least one actuator for the cutting process and its movement is controlled according to the contour of the cam.

Gemäß einer bevorzugten Ausführungsform der vorliegenden Erfindung wird der Fadenfänger für den Fadenabschneidvorgang mittels eines ersten Aktuators in Form eines ersten Antriebszylinders über einen ersten Kolben und mittels eines zweiten Aktuators in Form eines zweiten Antriebszylinders über einen zweiten Kolben in Aktion derart gesetzt, dass der Fadenfänger an die Steuerkurve gedrückt wird und seine Bewegung entsprechend der Kontur der Steuerkurve gesteuert wird.According to a preferred embodiment of the present invention, the thread catcher for the thread trimming process is activated by means of a first actuator in the form of a first drive cylinder via a first piston and by means of a second actuator in the form of a second drive cylinder via a second piston in such a way that the thread catcher is attached to the Control curve is pressed and its movement is controlled according to the contour of the control curve.

Die Antriebszylinder können beispielsweise Pneumatikzylinder sein, wobei einer der beiden Antriebszylinder dazu dient, den Fadenfänger mit hinreichend kleiner Kraft über die beiden Abtastrollen an die Steuerkurve anzulegen und der andere Antriebszylinder dazu dient, den Fadenfänger aus seiner Ruheposition in seine Betriebsstellung an dem Gegenmesser vorbei zu drücken.The drive cylinders can be pneumatic cylinders, for example, with one of the two drive cylinders being used to place the thread catcher against the control cam with a sufficiently small force via the two scanning rollers and the other drive cylinder being used to push the thread catcher past the counter-knife from its rest position into its operating position .

Weitere Einzelheiten, Merkmale und Vorteile der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung unter Bezugnahme auf die beigefügte Zeichnung. Darin zeigt:

Fig.1
eine Teilschnittansicht einer Ausführungsform einer Zweifaden-Doppelsteppstich-Blindstichnähmaschine gemäß der vorliegenden Erfindung;
Fig. 2
eine Seitenansicht auf den Nähkopf der Nähmaschine von Fig. 1 mit teilweise entfernten Komponenten zur deutlicheren Ansicht des Fadenabschneiders;
Fig. 3
eine Ansicht des Fadenabschneiders der vorliegenden Erfindung von hinten mit Steuerkurve;
Fig.4
eine perspektivische Ansicht des Fadenabschneiders, gedreht in eine im Wesentlichen horizontale Lage;
Fig. 5
eine Ansicht von vorn auf den erfindungsgemäßen Fadenabschneider mit Greifer und Greiferbrücke;
Fig.6
eine perspektivische Ansicht, ähnlich zu jener von Fig. 4 in einer Stellung unmittelbar vor dem Abschneiden der beiden Fäden mittels Gegenmesser;
Fig. 7
eine perspektivische Ansicht des Spulengehäuse mit darin aufgenommener Fadenspule;
Fig. 8
eine Ansicht ähnlich zu jener von Fig. 5 ergänzt um Aktuatoren jeweils mit Antriebszylinder; und
Fig. 9
eine vergrößerte Seitenansicht auf den unteren Abschnitt des Nähkopfes von Fig. 1.
Further details, features and advantages of the present invention result from the following description with reference to the attached drawing. It shows:
Fig.1
Fig. 13 is a partial sectional view of an embodiment of a two-thread lockstitch blindstitch sewing machine according to the present invention;
2
a side view of the sewing head of the sewing machine from FIG 1 with partially removed components for a clearer view of the thread cutter;
3
a rear view of the thread trimmer of the present invention with cam;
Fig.4
a perspective view of the thread cutter rotated to a substantially horizontal position;
figure 5
a front view of the thread cutter according to the invention with gripper and gripper bar;
Fig.6
a perspective view similar to that of FIG 4 in a position immediately before the two threads are cut off by means of a counter-knife;
7
a perspective view of the spool housing with recorded therein thread spool;
8
a view similar to that of figure 5 supplemented by actuators each with drive cylinder; and
9
12 is an enlarged side view of the lower portion of the sewing head of FIG 1 .

In den Figuren sind gleiche Elemente der erfindungsgemäßen Blindstichnähmaschine mit gleichen Bezugsziffern bezeichnet.In the figures, the same elements of the blind stitch sewing machine according to the invention are denoted by the same reference numbers.

In Fig. 1 ist eine Ausführungsform der erfindungsgemäßen Zweifaden-Blindstich-Doppelsteppstich-Blindstichnähmaschine 1 in teilweise geschnittener Seitenansicht dargestellt. Die Blindstichnähmaschine 1 weist ein Nähmaschinen-Gehäuse 3 auf, das einen Nähmaschinen-Gehäuse-Oberarm 4, einen Nahmaschinen-Gehäuse-Stofftragarm 6 sowie einen Nähkopf 5 umfasst, welcher an dem Nähmaschinen-Gehäuse-Oberarm 4 angebracht ist. Eine von einem Antriebsmotor 7 angetriebene Hauptwelle 9 erstreckt sich entlang des Oberarms 4 und lagert außerhalb des Oberarms 4 ein Antriebszahnrad 13, das mit einem Antriebszahnrad 15 des Nähkopfes 5 kämmt und dazu eingerichtet ist, eine Antriebswelle 14 des Nähkopfes 5 anzutreiben. Antriebszahnrad 13 und Antriebszahnrad 15 bilden ein Antriebsgetriebe 11.In 1 an embodiment of the two-thread blindstitch double-lockstitch blindstitch sewing machine 1 according to the invention is shown in a partially sectioned side view. The blind stitch sewing machine 1 has a sewing machine housing 3 which includes a sewing machine housing upper arm 4, a sewing machine housing fabric support arm 6 and a sewing head 5 which is attached to the sewing machine housing upper arm 4 is attached. A main shaft 9 driven by a drive motor 7 extends along the upper arm 4 and supports a drive gear 13 outside the upper arm 4 which meshes with a drive gear 15 of the sewing head 5 and is adapted to drive a drive shaft 14 of the sewing head 5 . Drive gear 13 and drive gear 15 form a drive gear 11.

Die Hauptwelle 9 ist über einen Zahnriemen 37 mit einer Stoffbeugerwelle 35 verbunden, die zum Antrieb eines Stoffbeugers 12 dient. Wie in der Blindstich-Nähtechnik bekannt, kann durch Einstellung der oberen Totpunktlage des Stoffbeugers die Einstichtiefe der gebogenen Nadel 10 in das Nähmaterial eingestellt werden.The main shaft 9 is connected via a toothed belt 37 to a material flexor shaft 35 which serves to drive a material flexor 12 . As is well known in the art of blindstitching, the depth of penetration of the bent needle 10 into the suture material can be adjusted by adjusting the top dead center position of the fabric bender.

Die Antriebswelle 14 des Nähkopfes 5 dient zum Antrieb eines Nadelhebels 25, an dem eine gebogene Nadel 10 (Fig. 9) mittels einer Nadelhalterung 27 gelagert ist. Der Nadelhebel 25 ist schwenkbar um eine Nadelhebelachse 26 gelagert, wobei die Drehbewegung der Antriebswelle 14 des Nähkopfes 5 über einen Exzenter 19 mittels eines Pleuels 21, das in Verbindung mit dem Nadelhebel 25 steht, in eine Hin- und Herbewegung des Nadelhebels 25 umgesetzt wird. Das Pleuel 21 ist mittels eines Drehlagers 22 an dem Exzenter 19 gelagert.The drive shaft 14 of the sewing head 5 serves to drive a needle lever 25 on which a curved needle 10 ( 9 ) is mounted by means of a needle holder 27. The needle lever 25 is mounted pivotably about a needle lever axis 26, the rotational movement of the drive shaft 14 of the sewing head 5 being converted into a reciprocating movement of the needle lever 25 via an eccentric 19 by means of a connecting rod 21 which is connected to the needle lever 25. The connecting rod 21 is mounted on the eccentric 19 by means of a rotary bearing 22 .

Die Hauptwelle 9 dient weiterhin auch zum Antrieb eines Greifers 31, wobei die Kraftübertragung über ein Zahnrad 17 auf der Antriebswelle 14 erfolgt. Aus Übersichtlichkeitsgründen und weil dies Stand der Technik ist, ist der Greiferantrieb nicht näher dargestellt. Grundsätzlich gilt, dass zur Erzeugung einer Doppelsteppstichnaht sich der Greifer 31 pro vollständigem Nadelhub zweimal um seine Drehachse dreht.The main shaft 9 also serves to drive a gripper 31, with the power being transmitted via a gear wheel 17 on the drive shaft 14. For reasons of clarity and because this is state of the art, the gripper drive is not shown in detail. In principle, in order to produce a lockstitch seam, the gripper 31 rotates twice about its axis of rotation for each complete needle stroke.

Wie weiterhin aus Fig. 1 ersichtlich, ist ein Deckel 29 für den Greiferantrieb vorgesehen. Zur Einstellung der Fadenspannung des Nadelfadens ist eine Fadenspannungsvorrichtung 49 vorgesehen, mit der die Fadenspannung eingestellt bzw. auch wieder gelöst werden kann.How to continue 1 visible, a cover 29 is provided for the gripper drive. To adjust the thread tension of the needle thread, a thread tensioning device 49 is provided, with which the thread tension can be adjusted or released again.

Die Blindstichnähmaschine 1 weist weiterhin eine Nähguttransporteinrichtung 45 auf, deren Aufgabe es ist, dass Nähmaterial bzw. Nähgut nach jedem erzeugten Stich um eine vorgewählte Stichlänge weiterzutransportieren. Dies kann je nach Wunsch in Nährichtung oder auch entgegengesetzt erfolgen. Wird eine erzeugte Naht über einen gewissen Abschnitt in Gegenrichtung übernäht, wird eine besonders gute Verriegelung der Naht am Nahtende erreicht. Mit einer gleichen Vorgehensweise kann man auch eine Verriegelung des Nahtanfangs erreichen.The blind stitch sewing machine 1 also has a sewing material transport device 45, the task of which is to transport the sewing material or sewing material further by a preselected stitch length after each stitch that is produced. This can vary depending on your preference take place in the sewing direction or in the opposite direction. If a created seam is overstitched over a certain section in the opposite direction, a particularly good locking of the seam at the seam end is achieved. The beginning of the seam can also be locked using the same procedure.

In Fig.2 ist auf deutlichere Weise der Greifer 31 ersichtlich, der eine Greiferspitze 32 und einen Greiferrücken 34 aufweist. Zwischen der Greiferspitze 32 und dem Greiferrücken ergibt sich ein Greiferraum. Der Greifer 31 erstreckt sich um ein Spulengehäuse 36, in dem eine Fadenspule 33 aufgenommen ist, in der ein Spulenfadenvorrat aufgenommen ist.In Fig.2 1, the gripper 31 can be seen more clearly, having a gripper tip 32 and a gripper back 34. FIG. There is a gripper space between the gripper tip 32 and the gripper back. The gripper 31 extends around a bobbin case 36 in which is received a thread spool 33 in which a supply of bobbin thread is received.

Das Spulengehäuse 36 weist zwei Vorsprünge 56 und 58 auf, zwischen denen ein Freiraum vorhanden ist, der dazu dient, mit einem Vorsprung einer Greiferbrücke 38 (Fig. 5 und 9) zusammenzuwirken, um das Spulengehäuse 36 an einer Drehung zu hindern. Denn zum Abziehen des Spulenfadens von der Fadenspule 33, die sich innerhalb des Spulengehäuses 36 dreht, muss die Ausgangsöffnung für den Spulenfaden im Spulengehäuse stets lagefixiert sein. Außen um das Spulengehäuse 36 herum dreht sich mit hoher Geschwindigkeit der Greifer 31.The bobbin housing 36 has two projections 56 and 58, between which there is a free space which serves to connect a projection of a gripper bridge 38 ( figure 5 and 9 ) cooperate to prevent the spool housing 36 from rotating. This is because, in order to pull off the bobbin thread from the bobbin 33, which rotates within the bobbin case 36, the exit opening for the bobbin thread in the bobbin case must always be fixed in position. The hook 31 rotates at high speed around the outside of the bobbin housing 36.

Aus Fig. 2 ist weiterhin ein erfindungsgemäßer Fadenabschneider 61 ersichtlich. Dieser weist einen Fadenfänger 63 auf, der eine gebogene Form aufweist und mit einer Schneideinrichtung 67, die ein Gegenmesser 69 aufweist, zusammenwirkt. Der Fadenabschneider 61 wird weiter unten näher beschrieben. Zur Betätigung des Fadenabschneiders 61 ist ein Aktuator 65 bzw. sind zwei getrennte Aktuatoren vorgesehen, die zwei Antriebszylinder, einen ersten Antriebszylinder 103 und einen zweiten Antriebszylinder 105, die über eine Pneumatikzufuhr 71 zum Fadenabschneiden mit Druckluft beaufschlagt werden.Out 2 a thread cutter 61 according to the invention can also be seen. This has a thread catcher 63 which has a curved shape and interacts with a cutting device 67 which has a counter-knife 69 . The thread cutter 61 will be described in more detail below. An actuator 65 or two separate actuators are provided for actuating the thread cutter 61, the two drive cylinders, a first drive cylinder 103 and a second drive cylinder 105, which are acted upon by compressed air via a pneumatic supply 71 for thread cutting.

Es wird nunmehr Bezug genommen auf Fig. 3. Diese zeigt entgegen der Ansicht gemäß Fig. 2, die den Greifer 31 mit Fadenabschneider 61 von vorne zeigt, eine Ansicht von hinten auf den Greifer 31 und den Fadenabschneider 61. Der Greifer wird von einer Greiferwelle 30 (siehe auch Fig.4) angetrieben, wobei gemäß Fig. 3 vor dem Greifer 31, in Fig. 2 also hinter dem Greifer 31, eine Steuerkurve 87 vorgesehen ist, die drehfest auf der Greiferwelle 30 angeordnet ist und sich somit zusammen mit dem Greifer 31 dreht.Reference is now made to 3 . This shows contrary to the view according to 2 , which shows the hook 31 with the thread cutter 61 from the front, a rear view of the hook 31 and the thread cutter 61. The hook is driven by a hook shaft 30 (see also Fig.4 ) driven, according to 3 in front of the rapier 31, in 2 So behind the gripper 31, a cam 87 is provided which is arranged in a rotationally fixed manner on the gripper shaft 30 and thus rotates together with the gripper 31 .

Der Fadenfänger 63 umfasst einen Schwenkhebel 64, der schwenkbeweglich um eine Drehachse 79 gelagert ist. Seitlich neben der Drehachse 79 ist eine Abtastrolle 66 an dem Schwenkhebel 64 angeordnet, die ihrerseits mit einer Abtastrolle 83 eines Zwischenhebels 81 zusammenwirkt, der um eine Drehachse 85 drehbar gelagert ist. Die Abtastrolle 83 des Zwischenhebels 81 kann in Anlage an die Steuerkurve 87 gebracht werden und beim Abfahren dieser Kurve während der Greiferdrehung wird deren Außenkontur auf die Abtastrolle 66 übertragen und ein entsprechendes Schwenken des Fadenfängers 63 erzeugt.The thread catcher 63 includes a pivoting lever 64 which is mounted pivotably about an axis of rotation 79 . A follower roller 66 is arranged on the pivoting lever 64 laterally next to the axis of rotation 79 , which in turn interacts with a follower roller 83 of an intermediate lever 81 which is rotatably mounted about an axis of rotation 85 . The follower roller 83 of the intermediate lever 81 can be brought into contact with the control cam 87 and when following this curve during the rotation of the gripper, its outer contour is transferred to the follower roller 66 and a corresponding pivoting of the thread catcher 63 is produced.

Wie aus Fig. 3 ersichtlich, hat die Steuerkurve eine bestimmte Außenkontur, beispielsweise mit einem Steilanstiegskurvenabschnitt 88. Dieser Steilanstiegskurvenabschnitt 88 bewirkt ein sehr schnelles und deutliches Auffahren der Abtastrolle 83 und damit auch entsprechendes Auffahren des Schwenkhebels 64, wodurch ein sehr schnelles Zurückziehen des Fadenfängers 63 aus dem Greiferraum erreicht wird.How out 3 As can be seen, the control cam has a specific outer contour, for example with a steeply rising curve section 88. This steeply rising curve section 88 causes the follower roller 83 to move up very quickly and clearly, and thus also the pivoting lever 64 to move up accordingly, as a result of which the thread catcher 63 is pulled back very quickly from the hook space .

Die Zwischenschaltung des Zwischenhebels 81 mit Abtastrolle 83 zwischen Steuerkurve 87 und Abtastrolle 66 hat hauptsächlich ihren Grund darin, dass der Fadenabschneider 61 so bauklein wie möglich gestaltet werden muss, damit die Steuerkurve 87 nicht so groß wird, dass sie mit der Stichplatte 28 kollidiert.The interposition of the intermediate lever 81 with the follower roller 83 between the cam 87 and the follower roller 66 is mainly due to the fact that the thread trimmer 61 has to be designed as small as possible so that the cam 87 does not become so large that it collides with the needle plate 28.

Klappt man die Darstellung von Fig. 3 um eine horizontale Achse nach vorne und dreht sie um 180°, gelangt man zur perspektivischen Ansicht von Fig. 4. In dieser Ansicht wird deutlich, dass sich das Spulengehäuse 36 teilweise leicht beabstandet von und innerhalb des Greifers 31 befindet, wobei in der Darstellung gemäß Fig. 4 der Fadenfänger 63 sich eingeschwenkt bzw. eingetaucht in den Greiferraum befindet und dem Greiferrücken 34 gefolgt ist.If you fold the representation of 3 forwards about a horizontal axis and rotates it by 180°, one arrives at the perspective view of 4 . In this view, it can be seen that the bobbin case 36 is partially spaced slightly from and within the gripper 31, as shown in FIG 4 the thread catcher 63 is pivoted or immersed in the gripper space and has followed the back of the gripper 34.

Nachfolgend wird die spezielle Ausgestaltung des Fadenfängers 63 beschrieben. Der Fadenfänger 63 weist eine Spitze 99 auf, an die sich ein vorderer Abschnitt des Fadenfängers 63 anschließt. Der Fadenfänger 63 weist einen Fanghaken 89 für den Spulenfaden 97 und das vordere Trumm des Nadelfadens 93 in der Vorwärtsbewegung des Fadenfängers 63, einen Fanghaken (91) für den Spulenfaden (97) und das vordere Trumm des Nadelfadens (93) in der Rückwärtsbewegung, einen Fadenkanal (92) und eine Schneidkante (101) auf, sowie eine vordere Fadenführung (102) für Nadelfaden und Spulenfaden (97). Die Spitze 99 schiebt das hintere Trumm der durch den Greifer 31 aufgezogenen Nadelfadenschlinge nach hinten und das vordere Trumm nach vorne, sodass sich das vordere Trumm des Nadelfadens mit dem Fanghaken 91 erfassen lässt. Unterhalb des Fanghakens 91 für den Nadelfaden befindet sich ein Fadenkanal 92, der sich in Richtung Spitze 99 erstreckt und in einer Schneidkante 101 endet. Die Schneidkante 101 dient zusammen mit einem Gegenmesser 69 der Schneideinrichtung 67 zum Abschneiden sowohl des Spulenfahrens als auch des Nadelfadens, wenn sich der Fadenfänger 63 an dem Gegenmesser 69 der Schneideinrichtung 67 in seine Ruhestellung zurückbewegt.The special configuration of the thread catcher 63 is described below. The thread catcher 63 has a tip 99 to which a front section of the thread catcher 63 connects. The thread catcher 63 has a catch hook 89 for the bobbin thread 97 and the front run of the needle thread 93 in the forward movement of the thread catcher 63, a catch hook (91) for the bobbin thread (97) and the front run of the needle thread (93) in the reverse movement, a thread channel (92) and a cutting edge (101), as well as a front thread guide (102) for needle thread and bobbin thread (97). The tip 99 pushes the rear strand of the needle thread loop pulled up by the hook 31 backwards and the front strand forwards, so that the front strand of the needle thread can be caught with the catch hook 91 . Below the catch hook 91 for the needle thread is a thread channel 92 which extends in the direction of the tip 99 and ends in a cutting edge 101 . The cutting edge 101 is used together with a counter-knife 69 of the cutting device 67 to cut both the bobbin winding and the needle thread when the thread catcher 63 on the counter-knife 69 of the cutting device 67 moves back into its rest position.

In Fig. 5 ist der Fadenabschneider 61 in einer Stellung kurz vor dem Abschneiden sowohl des Spulenfaden als auch des Nadelfadens dargestellt, wobei weiterhin die Stichplatte 28 mit der Greiferbrücke 38 dargestellt ist, die das Spulengehäuse 36 in seiner Lage am Drehen hindert.In figure 5 the thread cutter 61 is shown in a position just before the cutting of both the bobbin thread and the needle thread, the throat plate 28 also being shown with the gripper bridge 38 which prevents the bobbin housing 36 from rotating in position.

In Fig. 6 ist in vergrößertem Maßstab perspektivisch der Fadenabschneider 61 und in Teilansicht der Greifer 31 dargestellt, und zwar in einer Position unmittelbar vor dem Abschneiden des Spulenfadens und des Nadelfadens. Wie aus Fig. 6 ersichtlich, laufen beide Fäden im Bereich der Spitze 99 über eine vordere Fadenführung 102, die beispielsweise in Form einer Einkerbung ausgebildet ist. Sowohl der Nadelfaden als auch der Spulenfaden haben durch das Herausziehen mittels des Fadenfängers 63 jeweils eine Fadenschlaufe gebildet. Werden nunmehr in dieser Stellung gemäß Fig. 6 der Nadelfaden und der Spulenfaden abgetrennt, so verbleiben vorteilhafterweise ausreichend lange Fadenenden übrig, die ein problemloses Annähen bei einem nächsten Nähmaterial ermöglichen.In 6 12 shows, on an enlarged scale, the thread cutter 61 in perspective and the loopers 31 in partial view, at a position immediately before the bobbin thread and the needle thread are trimmed. How out 6 As can be seen, both threads run in the area of the tip 99 over a front thread guide 102, which is designed, for example, in the form of a notch. Both the needle thread and the bobbin thread have each formed a thread loop as a result of being pulled out by means of the thread catcher 63 . Are now in this position according to 6 the needle thread and the bobbin thread are separated, so advantageously sufficiently long thread ends remain, which allow problem-free sewing on of the next sewing material.

In Fig. 7 ist in perspektivischer Darstellung das Spulengehäuse 36 dargestellt, in dem sich die Fadenspule 33 befindet. Mit 107 ist eine Fadenspannungsvorrichtung für den Spulenfaden dargestellt, die am vorderen Ende eine Einbuchtung 109 aufweist, die sich im oberen bzw. vorderen Bereich der Fadenspannungsvorrichtung 107 befindet, und zur Führung des Spulenfadens dient.In 7 the bobbin housing 36, in which the thread bobbin 33 is located, is shown in a perspective view. A thread tensioning device for the bobbin thread is shown at 107, which has an indentation 109 at the front end, which is located in the upper or front area of the thread tensioning device 107 and serves to guide the bobbin thread.

In Fig. 8 ist zusätzlich zur Darstellung gemäß Fig. 5 (allerdings ohne Stichplatte und Greiferbrücke und ohne Fäden) der Fadenabschneider 61 dargestellt, zusammen mit einem Aktuator 65, dessen Aufgabe es ist, den Fadenabschneider 61 aus seiner Ruheposition in seine Arbeitsposition zu bewegen, in der er in den Greiferraum eintaucht und den Spulen- und Nadelfaden fängt und herauszieht. Der Aktuator 65 ist aufgeteilt in zwei Teil-Aktuatoren mit einem ersten Arbeits- oder Antriebszylinder 103 und einem zweiten Arbeits- oder Antriebszylinder 105. Der erste Antriebszylinder 103 weist einen ersten Kolben 104 auf und der zweite Antriebszylinder 105 weist einen zweiten Kolben 106 auf. Beide Kolben dienen zur Anlage an den Schwenkhebel 64.In 8 is in addition to the presentation according to figure 5 (however without needle plate and looper bridge and without threads) the thread trimmer 61 is shown, together with an actuator 65, the task of which is to move the thread trimmer 61 from its rest position to its working position, in which it dips into the looper area and the bobbin and catches and pulls out the needle thread. The actuator 65 is divided into two sub-actuators with a first working or drive cylinder 103 and a second working or drive cylinder 105. The first drive cylinder 103 has a first piston 104 and the second drive cylinder 105 has a second piston 106. Both pistons are used to rest against the swivel lever 64.

Im dargestellten Ausführungsbeispiel werden der erste Antriebszylinder 103 und der zweite Antriebszylinder 105 mittels Pneumatik gesteuert, wobei in Fig. 8 eine Pneumatikzufuhr 71 dargestellt ist. Die Wirkungsweise der beiden Antriebszylinder 103 und 105 ist wie folgt: mit dem ersten Kolben 104 wird der Fadenabschneider 61 nach unten gedrückt, sodass die Abtastrolle 83 in Anlage an die Steuerkurve 87 kommt. Dabei unterstützt der zweite Antriebszylinder 105 mit einem kleinen Hub den ersten Antriebszylinder 103, um den Fadenfänger 63 aus seiner Ruheposition zu schwenken. Werden beide Zylinder 103, 105 mit Druckluft beaufschlagt, taucht der Fadenfänger 63 kurvengesteuert in den Greiferraum, um die beiden Fäden herauszuziehen.In the exemplary embodiment shown, the first drive cylinder 103 and the second drive cylinder 105 are controlled by means of pneumatics, with 8 a pneumatic supply 71 is shown. The operation of the two drive cylinders 103 and 105 is as follows: the first piston 104 presses the thread cutter 61 downwards so that the follower roller 83 comes into contact with the cam 87 . The second drive cylinder 105 supports the first drive cylinder 103 with a small stroke in order to pivot the thread catcher 63 out of its rest position. If both cylinders 103, 105 are pressurized with compressed air, the thread catcher 63 dives cam-controlled into the gripper area in order to pull out the two threads.

Fig. 9 zeigt in vergrößertem Maßstab einen Ausschnitt des Nähmaschinenkopfes 5 im Bereich des Greifers 31, des Nadelhebels 25, des Stoffbeugers 12 und der Nähguttransporteinrichtung 45. In dieser Darstellung ist insbesondere die gebogene Nadel 10 deutlich erkennbar, die in der Nadelhalterung 27 des Nadelhebels 25 eingeklemmt ist. Die Lagerung des Nadelhebels 25 erfolgt über Lagerzapfen 113 durch die die Nadelhebelachse 26 gebildet wird. In Fig. 9 ist nur der rechte Lagerzapfen 113 ersichtlich. 9 shows on an enlarged scale a section of the sewing machine head 5 in the area of the hook 31, the needle lever 25, the fabric bender 12 and the sewing material transport device 45. In this representation, the bent needle 10 is particularly clearly visible, which is clamped in the needle holder 27 of the needle lever 25. The needle lever 25 is mounted via bearing journals 113 through which the needle lever axis 26 is formed. In 9 only the right bearing pin 113 can be seen.

Weiterhin ist der Stoffbeuger 12 deutlich ersichtlich, der in dieser Position in die Stichplatte 28 angehoben ist und ein entsprechendes Nähmaterial (nicht dargestellt) nach oben aufbeugen würde, in das die gebogene Nadel 10 einsticht. Links und rechts neben dem Stoffbeuger 12 ist eine Nähguttransporteinrichtung 45 angeordnet, welche hier beispielhaft in Form von umlaufenden Bändern ausgebildet ist. Alternative Ausführungsformen sind aus dem Stand der Technik bekannt.Furthermore, the fabric bender 12 can be clearly seen, which in this position is raised into the needle plate 28 and would bend up a corresponding sewing material (not shown) into which the bent needle 10 pierces. left and A sewing material transport device 45 is arranged to the right of the fabric bender 12, which is designed here by way of example in the form of circulating belts. Alternative embodiments are known from the prior art.

In den Figuren nicht dargestellt ist eine entsprechende Verkleidung des Nähkopfes 5.A corresponding covering of the sewing head 5 is not shown in the figures.

Mit der vorliegenden Erfindung wird somit eine Zweifaden-Blindstich-Doppelsteppstich-Blindstichnähmaschine geschaffen, die erstmalig einen Fadenabschneider aufweist, der in der Lage ist, sowohl Spulenfaden als auch Nadelfaden in kontrollierter Weise sicher abzuschneiden, wobei keine wesentliche Änderung der Bauteile des Nähmaschinenkopfes zur Erzeugung der Doppelsteppstich-Blindstichnaht vorgenommen werden mussten. Dies hat den großen Vorteil, dass die sich über Jahrzehnte bewährte konstruktive Ausgestaltung der Komponenten zur Erzeugung der Doppelsteppstich-Blindstichnaht im Wesentlichen beibehalten werden konnte. Die erfindungsgemäße Nähmaschine eignet sich in hervorragender Weise für den Einsatz in einer automatisierten Produktion.The present invention thus provides a two-thread blindstitch double-lockstitch blindstitch sewing machine which, for the first time, has a thread trimmer capable of safely trimming both bobbin thread and needle thread in a controlled manner, with no significant modification to the components of the sewing machine head to produce the lockstitch blindstitch seam had to be made. This has the great advantage that the constructive design of the components for producing the double lockstitch blindstitch seam, which has been tried and tested for decades, could essentially be retained. The sewing machine according to the invention is outstandingly suitable for use in automated production.

Bezugszeichenliste:Reference list:

11
- Blindstichnähmaschine- Blindstitch sewing machine
33
- Nähmaschinen-Gehäuse- Sewing machine housing
44
- Nähmaschinen-Gehäuse-Oberarm- Sewing machine housing upper arm
55
-Nähkopf-sewing head
66
- Nähmaschinen-Gehäuse-Stofftragarm- Sewing machine housing fabric support arm
77
- Antriebsmotor- drive motor
99
- Hauptwelle- main shaft
1010
- gebogene Nadel- curved needle
1111
- Getriebe- Transmission
1212
- Stoffbeuger- Cloth Flexor
1313
- Antriebszahnrad- Drive gear
1414
- Antriebswelle des Nähkopfes- Drive shaft of the sewing head
1515
- Zahnrad- Gear
1717
- Zahnrad Greiferantrieb- Gear gripper drive
1919
- Exzenter für Nadelhebelantrieb- Eccentric for needle lever drive
2121
- Pleuel für Nadelhebel- Connecting rod for needle lever
2222
- Drehlager- Pivot bearing
2525
- Nadelhebel- Needle Lever
2626
- Nadelhebelachse- Needle lever axis
2727
- Nadelhalterung für gebogene Nadel- Needle holder for curved needle
2828
- Stichplatte- Throat plate
2929
- Deckel für Greiferantrieb- Cover for gripper drive
3030
- Greifenwelle- Griffon wave
3131
- Greifer- Gripper
3232
- Greiferspitze- Gripper tip
3333
- Fadenspule- Thread spool
3434
- Greiferrücken- Gripper back
3535
- Stoffbeugerwelle- Cloth flex shaft
3636
- Spulengehäuse- Bobbin case
3737
- Zahnriemen- timing belt
3838
- Greiferbrücke- Gripper bridge
4545
- Nähguttransporteinrichtung- Material transport device
4949
- Fadenspannungsvorrichtung für Nadelfaden- Thread tension device for needle thread
5656
- Vorsprung am Spulengehäuse- Projection on the bobbin case
658658
- Vorsprung am Spulengehäuse- Projection on the bobbin case
6161
- Fadenabschneider- Thread cutter
6060
- Abtastvorrichtung- scanning device
6363
- Fadenfänger- thread catcher
6464
- Schwenkhebel- Pivoting lever
6565
- Aktuator für Fadenabschneider- Actuator for thread trimmer
6666
- Abtastrolle- pickup roller
6767
- Schneideinrichtung- cutting device
6969
- Gegenmesser- counter knife
7171
- Pneumatikzufuhr- Pneumatic feed
7575
- Fadenhebel- Thread lever
7979
- Drehachse- axis of rotation
8181
- Zwischenhebel- intermediate lever
8383
- Abtastrolle- pickup roller
8585
- Drehachse des Zwischenhebels- Axis of rotation of the intermediate lever
8787
- Steuerkurve der Bewegung des Fadenziehmessers- Control curve of the movement of the thread-pulling knife
8888
- Steilanstiegskurvenabschnitt- Steep curve section
8989
-Fanghaken für Fäden beim Einschwenken-Catching hook for threads when pivoting
9191
- Fanghaken für Fäden beim Ausschwenken- Catch hook for threads when swinging out
9292
- Fadenkanal- thread channel
9393
- Nadelfaden vorderes Trumm- Needle thread front run
9595
- Nadelfaden hinteres Trumm- Needle thread rear run
9797
- Spulenfaden- Bobbin thread
9999
- Spitze des Fadenfängers- Tip of the thread catcher
101101
- Schneidkante des Fadenfängers- Cutting edge of thread catcher
102102
- vordere Fadenführung.- front thread guide.
103103
- erster Antriebszylinder- first drive cylinder
104104
- erster Kolben- first piston
105105
- zweiter Antriebszylinder- second drive cylinder
106106
- zweiter Kolben- second piston
107107
- Fadenspannungsvorrichtung für Spulenfaden- Thread tension device for bobbin thread
109109
- Einbuchtung- indentation
113113
- Lagerzapfen- Pivot

Claims (19)

  1. Blind stitch sewing machine, specifically a two-thread double-lockstitch blind stitch sewing machine (1),
    - which is specified for generating a blind stitch which connects sewn goods, formed by at least two sewing materials, one upper material and at least one backing material, in such a manner that the seam is not visible on the upper side of the upper material;
    - having a drive motor (7) which drives a needle lever (25) so as to oscillate about a needle lever axle (26) to which a curved needle (10) is fastened, the sewing thread extending through said needle (10) during the operation of the blind stitch sewing machine;
    - having a double lockstitch gripper (31) which revolves twice during each full needle stroke of the needle lever (25), composed of reciprocating forward and rearward movement, and which mounts a bobbin case (36) in which a bobbin thread reserve that is preferably wound on a thread bobbin (33) is received;
    - having a cloth bending unit (12) which intermittently and so as to be synchronous with the needle movement lifts the sewn goods in the direction of the needle lever axle (26), wherein the depth of the needle penetration of the curved needle (10) into the thickness of the upper material is adjustable by setting the upper dead centre of the cloth bending unit (12);
    - having a sewn goods transporting installation (45) which, between two stitches when sewing, is specified for transporting the sewn goods by a selectable stitch length forwards or backwards in the seam direction;
    - having a thread lever (75) which predefines the required length of the needle thread that is required for each revolution of a needle thread loop about the bobbin case (36) and which for tightening the thread retracts this predefined thread length after each revolution of the needle thread loop;
    - having a thread tensioning device (49) for the needle thread;
    - having a thread tensioning device (107) for the bobbin thread; and
    - having a needle plate (28) which has an upper side and a lower side, wherein the sewn goods and the cloth bending unit (12) are situated substantially on the lower side of the needle plate (28) while the gripper (31) as well as the curved needle (10) are situated on the upper side of the needle plate (28),
    characterized in that
    a thread cutter (61) is provided, said thread cutter (61) having a thread catcher (63) which is capable of and specified for gripping the needle thread as well as the bobbin thread and supplying said needle thread and said bobbin thread to a cutting installation (67).
  2. Blind stitch sewing machine according to Claim 1, characterized in that the thread catcher (63) at least in part plunges into a gripper space which in the rotating direction of the gripper (31) extends between a gripper spine (34) and a gripper tip (32) of the gripper (31), for gripping in said space the needle thread and the bobbin thread.
  3. Blind stitch sewing machine according to Claim 1 or 2, characterized in that the movement of the thread catcher (63) and the movement of the gripper (31) are synchronized such that collisions between the thread catcher (63) and the gripper (31) are precluded.
  4. Blind stitch sewing machine according to Claim 2, characterized in that the thread catcher (63) has catching devices (89, 91) which, as a result of the thread catcher (63) plunging into the gripper space and the thread catcher (63) subsequently retracting from the gripper space, are capable of acquiring the needle thread as well as the bobbin thread in the form of thread loops and extracting the latter from the gripper space in the direction of the cutting installation (67).
  5. Blind stitch sewing machine according to one of Claims 1 to 3, characterized in that the thread catcher (63) has a catching hook (89) for the bobbin thread (97) and the leading end of the needle thread (93) in the forward movement, a catching hook (91) for the bobbin thread (97) and the leading end of the needle thread (93) in the rearward movement, a thread duct (92) and a cutting edge (101), as well as a front thread guide (102) for the needle thread and the bobbin thread (97).
  6. Blind stitch sewing machine according to one of Claims 1 to 5, characterized in that the controlling of the movement of the thread catcher (63) of the thread cutter (61) takes place by means of a detecting device (60) which for the procedure of thread cutting is able to be moved, preferably by means of a detection roller (66), so as to bear on a cam (87) that revolves so as to be synchronous with a gripper (31) and controls the movement of the thread catcher (63) and is synchronized with the movement of the gripper (31).
  7. Blind stitch sewing machine according to Claim 6, characterized in that the detecting device (60) between the thread catcher (63) and the cam (87) furthermore has a gear mechanism which is embodied as an intermediate lever (81) that is pivotable about a rotation axle (85) and has a detection roller (83) which is able to be brought to bear on a cam (87) that revolves so as to be synchronous with the gripper (31).
  8. Blind stitch sewing machine according to Claim 6 or 7, characterized in that the thread catcher (63) performs a rapid retraction movement which is generated by a steeply ascending cam portion (88) in the cam (87).
  9. Blind stitch sewing machine according to one of Claims 2 to 8, characterized in that the thread catcher (63) performs a rapid retraction movement in that said thread catcher (63), in a temporal period that is shorter than the time required by the gripper (31) for a rotational angle of substantially 40°, is retracted from the circumferential region of the gripper (31), as a result of which a collision with the gripper tip (32) is avoided.
  10. Blind stitch sewing machine according to one of Claims 8 or 9, characterized in that the movement of the thread catcher (63) in the direction of a counter blade (69) of the cutting installation (67), upon the rapid retraction movement yet prior to the cutting procedure, is decelerated or brought to a stop so as to delay the temporal point of the cutting procedure until the thread lever (75) has moved close to the upper dead centre thereof.
  11. Blind stitch sewing machine according to Claim 10, characterized in that the decelerated movement of the thread catcher (63) takes place as a result of a latching position in the cam (87), said latching position being formed by a cam portion of the cam that has a substantially consistent cam diameter.
  12. Blind stitch sewing machine according to one of Claims 1 to 11, characterized in that the thread catcher (63) is arcuate and performs a pivoting movement about a rotation axle (79).
  13. Blind stitch sewing machine according to one of Claims 1 to 12, characterized in that the thread catcher (63) is configured such that said thread catcher (63) has a cutting edge (101) for the needle thread as well as for the bobbin thread, said cutting edge (101) in a retraction movement of the thread catcher moving along a counter blade (69) of the cutting installation (67), as a result of which the severing of both threads is effected.
  14. Blind stitch sewing machine according to one of Claims 1 to 13, characterized in that the length of the bobbin thread, when measured from the bobbin case (36), upon cutting is at least 20 mm, and the length of the needle thread, when measured from the needle (10), in the position of the needle lever (25) in the upper dead centre thereof is at least 45 mm.
  15. Blind stitch sewing machine according to Claim 13, characterized in that a front thread guide (102) is configured as a notch in the upper side of the thread catcher (63) in the region between a tip (99) and the cutting edge (101) of the thread catcher (63).
  16. Blind stitch sewing machine according to one of Claims 1 to 15, characterized in that the bobbin case (36) on the circumference thereof has the thread tensioning device of the bobbin thread in the form of a bobbin thread tensioning spring (107) which is provided with a concavity (109) that serves for receiving the bobbin thread (97), wherein the concavity (109) is disposed in the upper portion of the tensioning spring (107).
  17. Blind stitch sewing machine according to one of Claims 8 to 11, characterized in that the thread tension of the needle thread is released at the latest from the last third of the rapid retraction movement of the thread catcher (63), as a result of which the thread catcher (63) is enabled to pull a sufficient amount of needle thread from a needle thread supply using an acceptably low force.
  18. Blind stitch sewing machine according to one of Claims 6 to 8, 10, or 11, characterized in that the thread catcher (63) by way of at least one actuator (103) for the thread cutting procedure is pushed onto the cam (87) and the movement of said actuator (103) is controlled so as to correspond to the contour of the cam (87).
  19. Blind stitch sewing machine according to one of Claims 6 to 8, 10, 11, or 18, characterized in that the thread catcher (63) for the thread cutting procedure, by means of a first actuator in the form of a first drive cylinder (103), by way of a first piston (104) and, by means of a second actuator in the form of a second drive cylinder (105), by way of a second piston (106) is actuated in such a manner that the thread catcher (63) is pushed onto the cam (87) and the movement of said thread catcher (63) is controlled so as to correspond to the contour of the cam (87).
EP20161287.6A 2020-03-05 2020-03-05 Blind stitch sewing machine with thread cutter Active EP3875652B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20161287.6A EP3875652B1 (en) 2020-03-05 2020-03-05 Blind stitch sewing machine with thread cutter
PT201612876T PT3875652T (en) 2020-03-05 2020-03-05 Blind stitch sewing machine with thread cutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20161287.6A EP3875652B1 (en) 2020-03-05 2020-03-05 Blind stitch sewing machine with thread cutter

Publications (2)

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EP3875652A1 EP3875652A1 (en) 2021-09-08
EP3875652B1 true EP3875652B1 (en) 2022-01-26

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Application Number Title Priority Date Filing Date
EP20161287.6A Active EP3875652B1 (en) 2020-03-05 2020-03-05 Blind stitch sewing machine with thread cutter

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EP (1) EP3875652B1 (en)
PT (1) PT3875652T (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113914017B (en) * 2021-09-29 2023-12-15 武汉纺织大学 Lock stitch sewing device using crochet hook

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191402771A (en) * 1914-02-03 1915-01-14 James Mcculloch Improvements in or relating to Sewing Machines especially applicable for Blind-stitch Machines.
GB121702A (en) * 1918-07-10 1919-01-02 Arbetter Felling Machine Compa Improvements in and relating to Blind Stitch Sewing Machines.
JPS5257852U (en) * 1975-10-20 1977-04-26
DE10040807B4 (en) * 2000-08-21 2004-07-15 Ksl Keilmann Sondermaschinenbau Gmbh Blind stitch sewing machine
JP5042573B2 (en) * 2006-09-15 2012-10-03 Ｊｕｋｉ株式会社 sewing machine
DE202016104320U1 (en) * 2015-10-12 2016-09-19 Xi'an Typical Europe Gmbh sewing machine

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EP3875652A1 (en) 2021-09-08
PT3875652T (en) 2022-02-22

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