EP3875652A1 - Machine à coudre à points invisibles pourvu de coupe-fil - Google Patents

Machine à coudre à points invisibles pourvu de coupe-fil Download PDF

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Publication number
EP3875652A1
EP3875652A1 EP20161287.6A EP20161287A EP3875652A1 EP 3875652 A1 EP3875652 A1 EP 3875652A1 EP 20161287 A EP20161287 A EP 20161287A EP 3875652 A1 EP3875652 A1 EP 3875652A1
Authority
EP
European Patent Office
Prior art keywords
thread
needle
bobbin
sewing machine
catcher
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20161287.6A
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German (de)
English (en)
Other versions
EP3875652B1 (fr
Inventor
Michael Rosemann
Kostyantyn BEZRODNY
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Strobel Spezialmaschinen GmbH
Original Assignee
Strobel Spezialmaschinen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Strobel Spezialmaschinen GmbH filed Critical Strobel Spezialmaschinen GmbH
Priority to PT201612876T priority Critical patent/PT3875652T/pt
Priority to EP20161287.6A priority patent/EP3875652B1/fr
Publication of EP3875652A1 publication Critical patent/EP3875652A1/fr
Application granted granted Critical
Publication of EP3875652B1 publication Critical patent/EP3875652B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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 blind stitch sewing machine, specifically a two-thread lockstitch blind stitch sewing machine, according to the preamble of claim 1.
  • the blind stitch sewing machine is used to generate 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, i.e. the side of the sewing material visible from the outside. This requires that the needle used for the seam does not pierce the material up to its top.
  • a curved needle is used to create a blind stitch seam.
  • the sewing material to be sewn has at least two sewing materials, namely an upper material and at least one lower material, an inner lining material, for example, being blindly sewn in the context of the textile outer clothing.
  • Another possible sub-material is, for example, an additional label to be sewn on.
  • the material When used for seat covers in vehicle seats, the material is formed from an upper material, for example from leather, that is coated with a foam layer as the lower material.
  • a cover binding element is to be sewn with a blind stitch seam, which serves to permanently connect the cover of the vehicle seat with the seat structure of the vehicle seat.
  • the present invention is therefore based on the object of creating a thread cutter for a blindstitch sewing machine in the form of a two-thread lockstitch blindstitch sewing machine which enables the two threads to be cut in a controlled manner, with the previously existing machine design for generating the lockstitch blindstitch being essentially retained target.
  • the present invention is characterized in that in a two-thread lockstitch blind stitch sewing machine a thread cutter is provided which has a thread catcher which is able and set up to grasp both the needle thread and the bobbin thread and to feed them to a cutting device.
  • the sewing process can advantageously also be significantly shortened because the sewing person no longer has to cut the threads himself, which takes a considerable amount of time.
  • the length of the bobbin thread in particular can be reduced to a minimum, which has the advantage of lower consumption of the bobbin thread and thus an increase in productivity, because the thread bobbin must only be replaced after a longer time interval.
  • the thread catcher is advantageously at least partially immersed in a gripper space which extends in the direction of rotation of the gripper between a hook tip and a hook back of the hook in order to grasp the needle thread and the bobbin thread there. This enables a very space-saving and effective gripping of the two threads.
  • 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 excluded. This ensures safe operation of the thread cutter.
  • the synchronization between the hook movement and the thread catcher movement is ensured by a cam gear so that the thread cutting process can advantageously be carried out without stopping the hook movement.
  • the thread catcher advantageously has catching devices that are able to grasp both the needle thread and the bobbin thread by immersing the thread catcher in the gripper space by subsequently withdrawing the thread catcher from the gripper space in the form of thread loops and in the direction of the cutting device to pull out of the looper area.
  • the thread catcher advantageously has a catch hook for the bobbin thread, a catch hook for the front strand of the needle thread, a thread channel and a cutting edge, and a front thread guide for the needle thread and bobbin thread. This achieves a very effective design of the thread catcher, with the thread catcher cutting off the two threads by means of the cutting edge even participates.
  • the thread catcher can also be referred to as a thread-pulling knife
  • the movement of the thread catcher of the thread trimmer is controlled by means of a scanning device which, for the thread trimming process, can preferably be brought into contact with a control cam rotating synchronously with the gripper by means of a scanning roller, which controls the movement of the thread catcher and with which Synchronized movement of the gripper.
  • a scanning device which, for the thread trimming process, can preferably be brought into contact with a control cam rotating synchronously with the gripper by means of a scanning roller, which controls the movement of the thread catcher and with which Synchronized movement of the gripper.
  • the scanning device advantageously also has a transmission between the thread catcher and the control cam, which is designed as an intermediate lever pivotable about an axis of rotation with a scanning roller, which can be brought into contact with the control cam rotating synchronously with the gripper and in turn in contact with the scanning roller of the thread catcher can be brought.
  • the thread catcher advantageously executes a rapid retraction movement which is generated by a steep rise curve section in the control curve. As a result of this steep rise curve section, the thread catcher is moved out of the hook space in a very short time and a collision with the approaching hook tip is avoided.
  • the thread catcher executes a rapid retraction movement in that it is withdrawn from the circumferential area of the gripper in a period of time which 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 slowed movement of the thread catcher takes place through a detent position in the control cam, which is formed by a cam section of the control cam which has an essentially 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-shaped manner and performs a pivoting movement about an axis of rotation.
  • the thread catcher can also be designed in a straight line and performs an essentially 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 retracts, 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 is at least 45 mm. This ensures that sewing is guaranteed in the next sewing process. For example, there is no risk of the needle thread being pulled out of the loop of the bent needle.
  • the bobbin thread is securely gripped when it is pierced for the first time.
  • a front thread guide is preferably designed in the form of a notch in the top of the thread catcher or thread-pulling knife in the area of the tip and the cutting edge of the thread catcher. In this way, the two threads to be cut are safely fed to the cutting edge and a corresponding severing of both threads is ensured when the thread catcher moves past the counter knife.
  • the bobbin case has a bobbin thread tension spring on its circumference, which is provided with an indentation that serves to accommodate the bobbin thread, the indentation in the upper ( Fig. 7 ) or front (in the installed position) section of the tension spring is arranged.
  • This enables the bobbin thread to be gripped securely by the thread catcher, because the bobbin thread is thereby safely brought to the front side of the thread catcher and can thus be grasped by the catch hook.
  • the thread tension of the needle thread is released from the last third of the rapid retraction movement of the thread catcher at the latest, which enables the thread catcher to pull sufficient needle thread from a needle thread supply with a sufficiently small force.
  • a sufficiently small force means that the needle thread is pulled back without great tensile force, which prevents the needle thread from tearing off.
  • the thread cutting process is required at the end of the seam created.
  • the control cam which is attached to the shaft of the hook and rotates with it, must be able to rotate freely during sewing and without contact with the thread catcher.
  • the thread catcher is advantageously pressed against the control cam with at least one actuator for the cutting process and its movement is controlled in accordance with the contour of the control cam.
  • the thread catcher for the thread cutting 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 set in such a way that the thread catcher is pressed against the control cam and its movement is controlled according to the contour of the control cam.
  • the drive cylinders can be pneumatic cylinders, for example, with one of the two drive cylinders serving to apply the thread catcher to the control cam with a sufficiently small force via the two scanning rollers and the other drive cylinder serving to push the thread catcher from its rest position into its operating position past the counter knife .
  • FIG. 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 comprises 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.
  • 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 set up 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 fabric flexor shaft 35, which is used to drive a fabric flexor 12.
  • a fabric flexor shaft 35 which is used to drive a fabric flexor 12.
  • the penetration depth of the bent needle 10 into the sewing material can be adjusted by adjusting the top dead center position of the fabric flexor.
  • the drive shaft 14 of the sewing head 5 is used to drive a needle lever 25 on which a curved needle 10 ( Fig. 9 ) is mounted by means of a needle holder 27.
  • the needle lever 25 is mounted pivotably about a needle lever axis 26, whereby the rotary movement of the drive shaft 14 of the sewing head 5 via an eccentric 19 by means of a connecting rod 21, which is in connection with the needle lever 25, in a reciprocating manner. and reciprocation of the needle lever 25 is implemented.
  • the connecting rod 21 is mounted on the eccentric 19 by means of a pivot bearing 22.
  • the main shaft 9 also serves to drive a gripper 31, the power being transmitted via a gear 17 on the drive shaft 14.
  • the gripper drive is not shown in more detail. Basically, in order to produce a lockstitch seam, 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 set or also 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 generated. This can be done in the sewing direction or in the opposite direction, as desired. If a generated seam is overstitched over a certain section in the opposite direction, a particularly good locking of the seam at the end of the seam is achieved. The same procedure can also be used to lock the start of the seam.
  • Fig. 2 the gripper 31 can be seen more clearly, which has a gripper tip 32 and a gripper back 34.
  • a gripper space results between the gripper tip 32 and the back of the gripper.
  • the gripper 31 extends around a bobbin housing 36 in which a thread bobbin 33 is received, in which a supply of bobbin thread is received.
  • the spool housing 36 has two projections 56 and 58, between which there is a free space which is used to connect with a projection of a gripper bridge 38 ( Fig. 5 and 9 ) cooperate to prevent the bobbin case 36 from rotating. Because to pull the bobbin thread from the thread bobbin 33, which rotates inside the bobbin housing 36, the exit opening for the bobbin thread must always be fixed in position in the bobbin case. The gripper 31 rotates around the outside of the bobbin case 36 at high speed.
  • 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 is described in more detail below.
  • an actuator 65 or two separate actuators are provided, the two drive cylinders, a first drive cylinder 103 and a second drive cylinder 105, which are subjected to compressed air via a pneumatic supply 71 for thread trimming.
  • FIG Fig. 3 This shows contrary to the view according to Fig. 2 , which shows the gripper 31 with thread cutter 61 from the front, a view from behind of the looper 31 and the thread cutter 61.
  • the looper is driven by a looper shaft 30 (see also FIG Fig. 4 ) driven, according to Fig. 3 in front of the gripper 31, in Fig. 2 that is, behind the gripper 31, a control cam 87 is provided, which is arranged non-rotatably on the gripper shaft 30 and thus rotates together with the gripper 31.
  • the thread catcher 63 comprises a pivot lever 64 which is mounted such that it can pivot about an axis of rotation 79.
  • a scanning roller 66 is arranged laterally next to the axis of rotation 79 on the pivot lever 64, which in turn interacts with a scanning roller 83 of an intermediate lever 81 which is rotatably mounted about an axis of rotation 85.
  • the scanning roller 83 of the intermediate lever 81 can be brought into contact with the control cam 87 and when this curve is followed during the rotation of the gripper, its outer contour is transferred to the scanning roller 66 and a corresponding pivoting of the thread catcher 63 is generated.
  • control cam has a certain outer contour, for example with a steep rise curve section 88.
  • This steep rise curve section 88 causes the follower roller 83 to open very quickly and clearly, and thus also the pivoting lever 64 opens accordingly, whereby the thread catcher 63 is withdrawn very quickly from the gripper area will.
  • the interposition of the intermediate lever 81 with the follower roller 83 between the control cam 87 and the follower roller 66 is mainly due to the fact that the thread cutter 61 has to be designed as small as possible so that the control cam 87 does not become so large that it collides with the throat plate 28.
  • the thread catcher 63 has a tip 99 to which a front section of the thread catcher 63 is connected.
  • 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 backward movement 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 drawn by the gripper 31 to the rear and the front strand forwards, so that the front strand of the needle thread can be grasped with the catch hook 91.
  • the cutting edge 101 serves together with a counter knife 69 of the cutting device 67 to cut off both the bobbin run 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.
  • Fig. 5 the thread cutter 61 is shown in a position shortly before the cutting of both the bobbin thread and the needle thread, the throat plate 28 with the hook bridge 38 also being shown, which holds the bobbin housing 36 in FIG prevents its location from rotating.
  • Fig. 6 the thread cutter 61 and a partial view of the gripper 31 are shown in perspective on an enlarged scale, namely in a position immediately before the cutting of the bobbin thread and the needle thread.
  • both threads run in the region 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, then sufficiently long thread ends are advantageously left that allow problem-free sewing on the next sewing material.
  • bobbin housing 36 in which the filament bobbin 33 is located is shown in a perspective view.
  • a thread tensioning device for the bobbin thread is shown, 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 is used to guide the bobbin thread.
  • Fig. 8 is in addition to the representation according to Fig. 5 (but without throat plate and gripper bridge and without threads) the thread cutter 61 is shown, together with an actuator 65, the task of which is to move the thread cutter 61 from its rest position into its working position, in which it dips into the looper space and the bobbin and The needle thread catches and pulls it out.
  • the actuator 65 is divided into two partial 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 pivot lever 64.
  • the first drive cylinder 103 and the second drive cylinder 105 are controlled by means of pneumatics, with FIG Fig. 8 a pneumatic supply 71 is shown.
  • the operation of the two drive cylinders 103 and 105 is as follows: with the first piston 104, the thread cutter 61 becomes pressed down so that the follower roller 83 comes into contact with the control 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 plunges in a cam-controlled manner into the gripper space 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 gripper 31, the needle lever 25, the fabric flexor 12 and the sewing material transport device 45.
  • the curved needle 10 which is clamped in the needle holder 27 of the needle lever 25, can be clearly seen.
  • the needle lever 25 is supported by means of bearing journals 113 through which the needle lever axis 26 is formed. In Fig. 9 only the right bearing pin 113 can be seen.
  • the fabric flexor 12 is clearly visible, which in this position is raised into the throat plate 28 and a corresponding sewing material (not shown) would be bent upwards into which the bent needle 10 pierces.
  • a sewing material transport device 45 is arranged to the left and right of the fabric flexor 12, which is here, for example, in the form of circumferential bands. Alternative embodiments are known from the prior art.
  • a corresponding covering of the sewing head 5 is not shown in the figures.
  • a two-thread blindstitch double lockstitch blindstitch sewing machine is created, which for the first time has a thread cutter which is able to cut both bobbin thread and needle thread safely in a controlled manner, with no significant change in the components of the sewing machine head for generating the Lockstitch blindstitch seams had to be made.
  • This has the great advantage that the structural design of the components for producing the lockstitch blind stitch seam, which has proven itself over decades, could essentially be retained.
  • the sewing machine according to the invention is outstandingly suitable for use in an automated production.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP20161287.6A 2020-03-05 2020-03-05 Machine à coudre à point invisible pourvue de coupe-fil Active EP3875652B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PT201612876T PT3875652T (pt) 2020-03-05 2020-03-05 Máquina de costura de ponto invisível com dispositivo de corte de fio
EP20161287.6A EP3875652B1 (fr) 2020-03-05 2020-03-05 Machine à coudre à point invisible pourvue de coupe-fil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20161287.6A EP3875652B1 (fr) 2020-03-05 2020-03-05 Machine à coudre à point invisible pourvue de coupe-fil

Publications (2)

Publication Number Publication Date
EP3875652A1 true EP3875652A1 (fr) 2021-09-08
EP3875652B1 EP3875652B1 (fr) 2022-01-26

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EP20161287.6A Active EP3875652B1 (fr) 2020-03-05 2020-03-05 Machine à coudre à point invisible pourvue de coupe-fil

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PT (1) PT3875652T (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113914017A (zh) * 2021-09-29 2022-01-11 武汉纺织大学 一种使用钩针锁式线迹缝合装置
CN116180343A (zh) * 2023-02-13 2023-05-30 温州市驹腾科技有限公司 一种缝纫机的剪线装置

Citations (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.
US4054099A (en) * 1975-10-20 1977-10-18 Nara Sewing Machine Industrial Co., Ltd. Thread cutting mechanism for a sewing machine
EP1182287A2 (fr) * 2000-08-21 2002-02-27 KSL Keilmann Sondermaschinenbau GmbH Machine à coudre à point invisible
DE102007045598A1 (de) * 2006-09-15 2008-03-27 Juki Corp., Chofu Nähmaschine
DE202016104320U1 (de) * 2015-10-12 2016-09-19 Xi'an Typical Europe Gmbh Nähmaschine

Patent Citations (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.
US4054099A (en) * 1975-10-20 1977-10-18 Nara Sewing Machine Industrial Co., Ltd. Thread cutting mechanism for a sewing machine
EP1182287A2 (fr) * 2000-08-21 2002-02-27 KSL Keilmann Sondermaschinenbau GmbH Machine à coudre à point invisible
DE102007045598A1 (de) * 2006-09-15 2008-03-27 Juki Corp., Chofu Nähmaschine
DE202016104320U1 (de) * 2015-10-12 2016-09-19 Xi'an Typical Europe Gmbh Nähmaschine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113914017A (zh) * 2021-09-29 2022-01-11 武汉纺织大学 一种使用钩针锁式线迹缝合装置
CN113914017B (zh) * 2021-09-29 2023-12-15 武汉纺织大学 一种使用钩针锁式线迹缝合装置
CN116180343A (zh) * 2023-02-13 2023-05-30 温州市驹腾科技有限公司 一种缝纫机的剪线装置

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Publication number Publication date
PT3875652T (pt) 2022-02-22
EP3875652B1 (fr) 2022-01-26

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