EP0552343B1 - Nähvorrichtung - Google Patents

Nähvorrichtung Download PDF

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Publication number
EP0552343B1
EP0552343B1 EP92916939A EP92916939A EP0552343B1 EP 0552343 B1 EP0552343 B1 EP 0552343B1 EP 92916939 A EP92916939 A EP 92916939A EP 92916939 A EP92916939 A EP 92916939A EP 0552343 B1 EP0552343 B1 EP 0552343B1
Authority
EP
European Patent Office
Prior art keywords
sewing machine
block
thread
gripper
shuttle
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.)
Expired - Lifetime
Application number
EP92916939A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0552343A1 (de
Inventor
Philipp Moll
Norbert Laschet
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.)
Moll Automatische Naehsysteme GmbH
Original Assignee
Moll Automatische Naehsysteme 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 Moll Automatische Naehsysteme GmbH filed Critical Moll Automatische Naehsysteme GmbH
Publication of EP0552343A1 publication Critical patent/EP0552343A1/de
Application granted granted Critical
Publication of EP0552343B1 publication Critical patent/EP0552343B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B19/00—Programme-controlled sewing machines
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B59/00—Applications of bobbin-winding or -changing devices; Indicating or control devices associated therewith
    • D05B59/04—Devices for changing the bobbin

Definitions

  • the invention relates to a sewing device with a sewing machine which can be moved by a robot arm or another movement device and e.g. can be guided along the intended seam line.
  • the usual sewing machines are stationary. They have a plate on which the suture material is placed and a hold-down device which presses the suture material against the plate. The needle sticks into the suture through a recess in the plate, the upper thread being carried along by the needle. There is an essentially drum-shaped hook under the needle plate, which contains a thread spool with the lower thread. The looper is driven synchronously with the needle movement and it creates a loop between the upper thread and the lower thread.
  • Such sewing machines require that the sewing material is transported by the sewing machine during sewing.
  • Sewing machines are also known which are attached to a movement device and which are moved along the intended seam line.
  • the movement device can be designed such that the sewing machine can carry out movements in three-dimensional space while the suture material is held on a suture material carrier.
  • the upper thread is drawn off a thread spool that is able to take up a relatively large amount of thread.
  • the lower thread on the other hand, is located on a bobbin, which is arranged in the hook and has a relatively small size and only a relatively small thread supply of e.g. 30 m in length (maximum 70 m in length). Therefore, this coil must be changed frequently.
  • Each change of the bobbin must be done manually by an operator, which takes a lot of time. The sewing machine is not operational during the entire time of changing the bobbin.
  • the invention has for its object to provide a sewing device in which the downtimes of the sewing machine for changing the bobbin are reduced.
  • the main motor and the parts used to transport the upper thread are components of a basic unit to which a looper block is exchangeably fastened.
  • the looper head carries the looper and the bobbin arranged in it and thus all components required for the movement and loop formation of the lower thread are required. If the lower thread bobbin is empty, the looper block as a whole can be removed and exchanged for a looper block with a full lower thread bobbin that was previously available. The coil is therefore replaced by inserting an entire gripper head. This change can be carried out automatically without manual intervention, while changing the spool in the gripper head requires manual intervention.
  • the bobbin can be changed manually or automatically on the gripper head remote from the base unit without having to be in a hurry because the base unit provided with a different gripper head can now continue to work as a sewing machine.
  • the base unit and the gripper block are connected by a coupling device for establishing the drive connection for the gripper.
  • the gripper movement is synchronized with the movement of the needle bar. Synchronization is not to be understood as meaning that the two components mentioned perform the same movements with one another, but that the movement sequences of these components are coordinated with one another.
  • the sewing machine has only one motor, namely the main motor, which drives both the needle movement and the gripper movement.
  • the coupling device consists of a coupling which is able to connect the output shaft of the basic unit to the input shaft of the gripper block.
  • a conventional clutch or a gear clutch can be used for this.
  • the coupling device consists of a plug-in coupling which connects the supply and control devices of the basic unit with corresponding lines of the gripper block, the drives of the main motor and gripper motor being coordinated with one another for the mentioned synchronous operation.
  • a change station with at least one receiving unit can be provided.
  • the movement device moves the sewing machine so that the hook block attached to the base unit is inserted into a receiving unit.
  • the hook block is locked in the holding unit and this hook block is unlocked on the sewing machine.
  • the sewing machine can then be moved to another pick-up unit which contains a hook block with a full bobbin.
  • a locking device can be provided for holding the input shaft of the gripper block. If the gripper shaft rotates, the synchronism between the needle lever and the gripper rotation would be disturbed the next time the gripper block is coupled to the basic unit. When driving the basic unit, it is ensured that the driving gear assumes a defined rotational position when it is reinserted and engages with the same tooth.
  • the sewing device according to the invention is particularly suitable for those cases in which the sewing machine is attached to a movement device, for example to a robot arm, is attached, which guides the sewing machine along a predetermined three-dimensional path and is also able to move the sewing machine to set down the looper block and to pick up a new looper block.
  • a movement device for example to a robot arm
  • the invention can also be used in sewing machines which are operated in a stationary manner and in which, when the bobbin has become empty, the entire looper block is exchanged for a new looper block with a full bobbin.
  • a suture carrier 10 is shown on which the blanks 11 and 12 to be sewn together are held.
  • the sewing machine 13 is guided by a movement device 14 along the seam line 15 provided.
  • the movement device 14 here is a robot or manipulator with a manipulator arm 16.
  • the sewing machine 13 is attached to the manipulator arm 16, which can be moved or rotated along numerous axes.
  • the movement device 14 is controlled by a computer in such a way that the sewing machine 13 is moved exactly along the seam line 15.
  • the movement device 14 can transport the sewing machine 13 to the change station 20 shown in FIG. 2, which has two stationary receiving units 21 and 22.
  • the sewing machine 13 consists of a base unit 23 and a gripper block 24 detachably attached thereto.
  • the base unit 23 has a housing 25 with a cantilever arm 26, on which a needle bar 27 is attached pivotably about a horizontal axis 28.
  • the axis 28 is driven back and forth by the main motor (not shown) of the sewing machine.
  • the needle bar 27 carries a needle 29 which is curved around the axis 28 and which pierces through a recess of a hold-down 30 which is mounted coaxially to the axis 28.
  • a thread transmitter 31 is also mounted on the base unit 13, which is also from the main motor is driven back and forth and has an eyelet through which the upper thread 33 passes before it reaches the needle eye of the needle 29.
  • the bevel gear 41 protruding from the base unit 23 is driven by the output shaft 39, which in turn is driven by the main motor.
  • the gripper block 24 which is releasably attached to the underside of the housing 25 of the base unit 23, carries a needle plate 34 on a foot protruding in the direction of the hold-down device 30, against which the fabric to be sewn is pressed by the hold-down device 30.
  • the throat plate 34 has an opening for the passage of the needle 29. Behind the throat plate 34 is the hook 35, which contains the bobbin 36 for the lower thread.
  • the gripper 35 is rotated by a shaft 37 which is driven by the main motor contained in the base unit 13 via a coupling device 38. This rotation of the hook 35 is synchronized with the movements of the thread transmitter 31, the needle bar 27 and the hold-down device 30.
  • the hold-down device 30 presses the fabric against the stitch plate 34. Then the needle 29 executes the stitch, the upper thread 33 being entwined with the lower thread drawn off from the thread spool 36. Then the needle 29 is withdrawn and the hold-down device 30 is also moved back to release the fabric. Then the next feed step takes place along the intended seam line, which can be carried out by the movement device 14.
  • a corresponding feed device on the sewing machine 13.
  • the wave 37 protrudes from the housing of the gripper block 24 on both sides. At one end there is the gripper 35 and at the opposite end there is a double bevel gear 40 which, together with a bevel gear 41 of the basic unit 13, forms the coupling device 38. When the gripper block 24 is coupled to the base unit 13, the two bevel gears 40 and 41 come into mutual engagement with their toothings.
  • the gripper 35 fastened to the shaft 37 has a gripping structure 43 with thread guide tracks 44.
  • the gripping structure 43 encloses a bobbin case 45 in which the replaceable thread bobbin 36 for the lower thread is located.
  • the hook 35 has the function of knotting the upper thread and the lower thread in cooperation with the needle 29.
  • FIG. 5 shows the setting down of a gripper block 24 with an empty thread spool 36 in one take-up unit, while in the other take-up unit there is a gripper block 24 with a full thread spool 36 is located.
  • FIG. 6 shows the transfer of the base unit 23 from the hook block with an empty thread spool to the hook block with a full thread spool
  • FIG. 7 shows the removal of the now completed sewing machine with the hook block with a full thread spool from the holding unit 22.
  • the receiving units 21 and 22 are identical to one another.
  • Each receiving unit has a locking device 46 for holding the shaft 37 of the gripper block 24.
  • This locking device here consists of a piston-cylinder unit 47 which moves a pin 48 which can engage in the outer toothing of the double bevel gear 40 when the gripper block 24 is in the correct position in the receiving unit.
  • the locking device 46 prevents the shaft 37 from rotating when the bobbin 36 is replaced. This ensures that the base unit 23 receives the gripper block 24 in the same state as the gripper block has been set down. This is important so that the synchronization between the components of the base unit and the gripper block is not lost.
  • the locking of the gripper block and base unit is expediently provided such that the two parts can only be decoupled from one another in a very specific, defined phase position of the cycle of the main drive. In this way it is ensured that the uncoupling and the coupling of the gripper block always takes place in a defined phase position of the motor cycle, that is to say at very specific positions of the thread transmitter 31 and the needle lever 27.
  • such a locking device can also be provided on the gripper block 24, the locking of the shaft 37 always taking place when the gripper block is released from the basic unit.
  • each receiving unit 21, 22 has two laterally arranged piston-cylinder units 50, 51, which move clamping jaws 52 against the gripper block 24 from opposite sides and thereby hold the gripper block and fix it in the receiving unit.
  • the gripper block 24 is then unlocked by the base unit 23 and the base unit 23 is pulled off the movement device 14, the bevel gear 41 moving away from the gripper block 24 together with the base unit 23.
  • the gripper block 24 is provided with its own drive motor 53 for the shaft 37 of the gripper 35.
  • the drive motor 53 is controlled from the base unit 23, to which it is connected via control and supply cables 54.
  • the drive connection is established via a coupling device 38a designed as an electrical plug-in coupling, through which the synchronization between main motor and drive motor 53 is also achieved.
  • the drive motor 53 is expediently a motor that blocks the rotation of the shaft 37 in the switched-off state.
  • a sewing machine with a pivotable needle bar 27 instead of a sewing machine with a pivotable needle bar 27, a sewing machine with an axially moving needle bar can also be used within the scope of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Massaging Devices (AREA)
  • Manufacturing Of Electric Cables (AREA)
EP92916939A 1991-08-14 1992-08-11 Nähvorrichtung Expired - Lifetime EP0552343B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4126788A DE4126788C1 (US20100223739A1-20100909-C00025.png) 1991-08-14 1991-08-14
DE4126788 1991-08-14
PCT/EP1992/001837 WO1993004229A1 (de) 1991-08-14 1992-08-11 Nähvorrichtung

Publications (2)

Publication Number Publication Date
EP0552343A1 EP0552343A1 (de) 1993-07-28
EP0552343B1 true EP0552343B1 (de) 1995-10-25

Family

ID=6438229

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92916939A Expired - Lifetime EP0552343B1 (de) 1991-08-14 1992-08-11 Nähvorrichtung

Country Status (7)

Country Link
EP (1) EP0552343B1 (US20100223739A1-20100909-C00025.png)
JP (1) JPH06504225A (US20100223739A1-20100909-C00025.png)
KR (1) KR950014368B1 (US20100223739A1-20100909-C00025.png)
AT (1) ATE129533T1 (US20100223739A1-20100909-C00025.png)
DE (2) DE4126788C1 (US20100223739A1-20100909-C00025.png)
ES (1) ES2079201T3 (US20100223739A1-20100909-C00025.png)
WO (1) WO1993004229A1 (US20100223739A1-20100909-C00025.png)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10026242A1 (de) * 2000-05-26 2001-11-29 Bayerische Motoren Werke Ag Vorrichtung zum Wechseln des Oberfadens

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL265223A (US20100223739A1-20100909-C00025.png) * 1960-05-28
US4223618A (en) * 1978-02-09 1980-09-23 Gateway Industries, Inc. Automatic bobbin changer and apparatus for a sewing machine

Also Published As

Publication number Publication date
KR930703498A (ko) 1993-11-30
WO1993004229A1 (de) 1993-03-04
ATE129533T1 (de) 1995-11-15
ES2079201T3 (es) 1996-01-01
DE4126788C1 (US20100223739A1-20100909-C00025.png) 1992-11-26
EP0552343A1 (de) 1993-07-28
DE59204137D1 (de) 1995-11-30
KR950014368B1 (ko) 1995-11-25
JPH06504225A (ja) 1994-05-19

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