EP1209273B1 - Stitch forming process for an embroidery machine and embroidery machine for performing said process - Google Patents

Stitch forming process for an embroidery machine and embroidery machine for performing said process Download PDF

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Publication number
EP1209273B1
EP1209273B1 EP01811102A EP01811102A EP1209273B1 EP 1209273 B1 EP1209273 B1 EP 1209273B1 EP 01811102 A EP01811102 A EP 01811102A EP 01811102 A EP01811102 A EP 01811102A EP 1209273 B1 EP1209273 B1 EP 1209273B1
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EP
European Patent Office
Prior art keywords
thread
stitch
roller
thread roller
embroidery machine
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EP01811102A
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German (de)
French (fr)
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EP1209273A2 (en
EP1209273A3 (en
Inventor
Franz Lässer
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Franz Laesser AG
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Franz Laesser AG
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C11/00—Devices for guiding, feeding, handling, or treating the threads in embroidering machines; Machine needles; Operating or control mechanisms therefor
    • D05C11/08—Thread-tensioning arrangements

Definitions

  • the present invention relates to a method for stitch formation in a thread roller or thread reel embroidery machine, in which thread from the bobbins through Thread tension with the support of one acting on the thread roller or the thread rollers Torque is subtracted.
  • Thread roller rotates intermittently This happens as follows: When the needles hit the embroidery base is moved to avoid tension peaks in the needle threads Thread roller rotated by a drive by a predetermined amount. This will Thread supplied for stitch formation. By means of an adjustment lever, the angle at which the thread roller is rotated.
  • EP 0 014 897 suggests a person working independently of the thread tension electric actuator for driving the thread roller.
  • This actuator is from the Control unit controls the thread roller from stitch to stitch around that of the Control device to rotate predetermined dimension.
  • EP 0 666 351 also sees it as a delivery unit a thread roller controlled by the control unit, which according to the Amount of thread to be embroidered is rotated.
  • this does not seem to be working to have, because different owners of machines of the type of EP 0 666 351 have in their Machines subsequently installed a freewheel, which allows the thread to be pulled Turn the thread roller when the amount of thread supplied is scarce.
  • EP 0 906 982 column 2, lines 17 to 30 it is stated that it is practically difficult or it is impossible to calculate the exact amount to be applied to the embroidery Amount of thread, because this depends not only on the stitch width, but also on other factors such as the fabric thickness and stitch type. But it becomes too much thread delivered, so there is a loose embroidery. However, if the thread quantity is too short, so the embroidery is too tight and there is also a risk of thread breakage.
  • EP 0 906 982 proposed to control the thread roller so that only a subset of that for the stitch necessary thread is supplied and that the remaining amount is drawn off by thread pull becomes. To make this possible, the installation of a freewheel between Thread roller drive and thread roller provided. If the positive drive of the thread roller ceases, the thread roller can therefore be rotated further by pulling the thread.
  • CH 115 089 proposes a device for reducing the thread tension necessary for rotating the thread roller, in which organs act under spring force in the direction of the thread flow on the thread roller.
  • a spring is tensioned by a regularly moving machine part, for example the large thread guide, which then supplies a supporting torque which reduces the thread tension required to turn the thread roller.
  • the advantage of using a spring is that it delivers the supporting torque regardless of how fast the thread roller is rotated by the thread pull. It should be noted that with large stitch widths, the thread roller is turned faster by thread pull than with small stitch widths.
  • a disadvantage of this device is the fact that the supporting torque can only be changed by changing the spring.
  • EP 0 795 638 also describes a method in which the front thread of the Bobbin by thread tension with the support of a torque acting on the thread roller is subtracted.
  • This supporting torque is not from a spring, but delivered by an engine or the main drive.
  • the device sees one Type of slip clutch, with which the manually exerted on the thread roller maximum torque can be set.
  • This coupling has the shape of a Differential gear with a first and a second sun gear and a planet gear on, the drive train from the drive device to the thread roller over the first Sun gear, the planet gear to the second sun gear and from there via a freewheel to Thread roller runs.
  • the planet gear is on a brake disc rotatable about an axis arranged, and a braking device is provided with which a braking force on the rotatable disc can be exercised.
  • the freewheel serves a further movement of the Allow thread roller by thread pull when there is no more supporting torque is effective.
  • the braking device consists essentially of a pivotable Brake lever, which acts on the periphery of the brake disc by means of a brake shoe can.
  • a spring that acts on the brake lever can do more or with a set screw be less tensioned to the pressure of the brake shoe on the brake disc on the set the required dimension.
  • the device should also be inexpensive producible and easy to use.
  • the method according to the invention is characterized in that the size of the supporting torque based on data contained in the embroidery program for the stitch to be executed in each case; especially the data relevant for the stitch width, is measured.
  • the method according to the invention is based on the knowledge that the thread tension, the is necessary to turn the thread roller, with larger stitch widths is stronger than with small stitch widths.
  • the thread roller is therefore more or depending on the stitch width accelerated less.
  • Machine speed is usually somewhat reduced. Nevertheless, of course there is Danger of large forces in the needle thread which cause tearing of the thread can lead.
  • the method according to the invention eliminates this danger largely avoided because the supporting torque automatically due to the im Embroidery program contains data for each stitch to be executed individually is measured.
  • the size of the supporting torque, which from the in Data contained in the program is determined, can be enlarged or reduced manually. This enables fine adjustment and adaptation to the properties of the embroidery Fabric, or an adjustment to the number of embroidering embroidery points.
  • the procedure can be designed in such a way that after the Torque the further movement of the thread roller takes place by thread pull alone.
  • the thread roller can move further through the thread roller brake according to the Stitch type are more or less braked.
  • stitch types e.g. the lockstitch, where the shuttle thread is pulled onto the front of the embroidery becomes relative heavily braked.
  • the reverse is true for all stitch types, e.g. the satin stitch where the The shuttle thread must never be pulled to the front, braked less.
  • the invention also relates to an embroidery machine with a control unit which controls the machine controls embroidery tools according to the entered embroidery program Drive unit can be driven, a thread roller, via which the thread from the bobbin to Needle runs and which can be driven by thread tension, a thread roller brake, and one driven by the drive unit or a motor to the thread roller connected coupling for applying a supporting torque to the through Thread pull drivable thread roller.
  • this embroidery machine is thereby characterized in that the control unit has means which from the data of the Embroidery programs determine the stitch width of the respective stitch and use a predetermined curve generates a control signal or a control movement, and that the Coupling is designed such that it is based on the control signal or Control movement the supporting torque required for the respective stitch width generated.
  • Modern embroidery machines have an electronic control unit, which is able to to control the movements of the gate based on an embroidery program. Of the control unit can also perform many additional tasks, e.g. due to the Calculate the stitch width for each stitch. This data can then used to display thread consumption. With the present device the stitch distance data is used to control the signal or Generate control motion for the clutch, which is the supporting torque the thread roller creates.
  • the control unit can also have means which are derived from the data of the embroidery program generated a control signal for the thread roller brake regarding the stitch type.
  • This can the thread roller brake can be controlled to the needle thread more or depending on the stitch type to tighten less when the supporting torque is lost and the Thread roller solely by pulling the thread against the braking effect of the thread roller brake is moved on. It is expedient between the coupling device and the Thread roller arranged a freewheel so that the clutch does not brake when it does not provide any supporting torque.
  • the coupling device can act as a thread roller brake at the same time to let.
  • the separate thread roller brake can be dispensed with. This The solution is particularly suitable for small machines. It is also possible to use a To provide thread roller brake and the clutch as an additional thread roller brake let it work.
  • An expedient embodiment of the invention provides that the Coupling device in the form of a differential gear with a first and a second sun gear and a planet gear arranged on a planet gear carrier has, the drive train from the drive device to the thread roller over the first sun gear, the planet gear runs to the second sun gear that the Planet carrier is coupled with a brake disc rotatable about an axis, and that a brake controllable by the control unit is provided, with which a braking force can be exerted on the rotatable brake disc.
  • the brake e.g. electromagnetic Brake, is expediently arranged coaxially to the sun gears and has stationary part and a rotatable part, which with the rotatable brake disc is coupled. This design of the brake allows good regulation of the braking force.
  • the coupling device advantageously has a housing in which at least the Brake, e.g. electromagnetic brake, arranged in an oil bath
  • This training is particularly advantageous if the coupling is removed from the drive unit, e.g. by means of a Cam, is drivable.
  • the drive speed is small and large stitch widths always the same. With small stitch widths therefore occurs when braking a lot of slip and therefore a lot of warmth.
  • This then becomes the housing via the oil bath dissipated and radiated from this.
  • the oil bath guarantees one constant braking effect and low abrasion of the friction surfaces. It is possible to use a separate motor for the drive instead of a curve.
  • the coupling device is particularly inexpensive if the drive is not through a separate motor, but from the drive unit e.g. by means of a curve, is driven intermittently.
  • the drive has proven to be particularly advantageous Needle movement curve.
  • the coupling device can by means of a lever system and a freewheel with the needle plunger which can be actuated by the curve for the needle movement be coupled. This represents a particularly simple and inexpensive version because then there is also no need for a separate curve Crank rod to be hinged to a pivot lever, which over the freewheel with the first Sun gear is coupled.
  • Figure 1 shows schematically the arrangement of the embroidery tools, as they usually do Ship embroidery machines are used.
  • This figure is essentially the work of beautiful, lace, encyclopedia of advanced techniques, VEB subuchverlag Leipzig 1980, Pages 320 to 325 were taken from where the stitch formation process, as in Schiffli machines used, is described. Since this is the expertise of everyone An embroidery technician belongs to a detailed description of the stitch formation process waived or referred to the work cited by Schoener. In summary, but the following are noted:
  • the front thread 11, also called needle thread leads from the bobbin 12 over the thread roller 13 to the small thread conductor 14 and from there on large thread guide 15 to the needle 16.
  • the large thread guide is used for a short time for loop formation to provide the necessary amount of thread.
  • the schematic representation of FIG. 2 shows that when the method is carried out organs involved.
  • the control unit 25 comprises a computer in which the Embroidery program is entered.
  • the computer generates the necessary control signals Control of the motors 28, 29, 30, the coupling device 31 and the thread roller brake 24 of the embroidery machine. So the control unit controls the motor 28 for the main drive and Motors 29.30 for the gate drive.
  • the computer delivers for every stitch Information for horizontal and vertical gate movement.
  • the same Information is used to obtain the control signal for clutch device 31 generate, which applies a supporting torque to the thread roller 13, depending on Stitch width is different, namely larger for large stitch widths than for small ones Stitches where the thread roller has to be accelerated less.
  • the generation of the control signal is shown in FIG. 3. From the information for the Gate movement in the x and y directions, the stitch width is determined in block 33. The values for the supporting torque for different stitch widths are stored in block 35 These values have been determined by experiments. These values result in a curve that initially linear with the stitch width and then with increasing stitch width flattened The output signal from block 35 can be adjusted manually using the adjusting device 37 be enlarged and reduced in order to increase the supporting torque if necessary increase or decrease. It is obvious that the torque must not be so great to turn the thread roller 13 even in the absence of thread tension, because otherwise more thread would be delivered than is necessary for the stitch. It is clear to the person skilled in the art that the computer the control unit 25 can be programmed to perform the operations shown in FIG perform.
  • the coupling device 31 can be driven in various ways.
  • the coupling device 31 can be driven by a cam plate 38 of the main drive 28. Since a separate motor is therefore not necessary, this is an inexpensive solution.
  • the drive through the movement of the is even more advantageous in terms of cost Needle lifter drive shaft as will be described later with reference to Figures 4a and 4b.
  • thread roller 13 is not as in FIGS. 1 and 2 shown must be executed. Rather, it is also possible for each thread 11 in known manner to provide a thread reel that can be engaged and disengaged. If in this scripture thread roll is to be understood in the broader sense.
  • FIGS. 4a and 4b show, it is also possible to move the Exploit needle tappet drive shaft 41 from the needle cam (not shown) is set in motion. This movement is from the lever 36 on the Transfer linkage 42 to the pivot lever 43. This will be with everyone Machine cycle back and forth synchronously with the needle tappets.
  • FIG. 5 shows an exemplary embodiment of the coupling device 31 in detail.
  • This essentially consists of the drive, e.g. a pivot lever 43 4a and 4b, hollow shaft 45 rotatable in one direction, one Differential gear 47, which with a first sun gear 49, a planet carrier 50 a planet gear 51 and a second sun gear 53, a freewheel 55, one of the second sun gear 53 via the freewheel 55 drivable shaft 57 and one electromagnetic brake 59 with an axially displaceable brake disc 61.
  • Das Planet gear 51 consists of two interconnected gears 79, 80 and is one Axis 82 rotatable. This is firmly connected to the disc-shaped planet carrier 50.
  • the planet gear carrier 50 is axially displaceable by means of driver bolts 63 Brake disc 61 coupled.
  • the freewheel 55 is between the hub 54 of the second sun gear 53 and one with the shaft 57 fixedly connected sleeve 56 and allows rotation of the thread roller 13th or the shaft 57 by thread tension alone when the supporting torque stops and thus the second sun gear 53 stands still.
  • Another freewheel 58 is between the hub 54 of the second sun gear 53 and arranged stationary sleeve 62 which is connected to the cover 69.
  • the freewheel 58 prevents the second sun gear 53 from rotating backward.
  • the freewheel 58 is designed to be unlockable in order to turn the thread roller 13 backward if necessary enable.
  • the hollow shaft 45 could e.g. driven by a motor. In the shown Embodiment, however, is driven by a pivot lever 43 (see FIG. 4), the is moved back and forth once per machine cycle. One between the swing lever 43 and the hollow shaft 45 arranged freewheel 75 ensures that the hollow shaft 45 only in one Direction of rotation is rotated.
  • the organs of the clutch device 31 are in one with the cover 69 closed housing 71, which has an outlet 73 for changing the oil bath having.
  • Fixed to the housing 71 is the stationary part 60 of FIG electromagnetic brake 59, which contains the solenoid.
  • the stationary part 60 Over the stationary part 60, the movable part of the brake, the axially displaceable brake disk 61, is arranged.
  • the drive train from the pivot lever 43 runs via the freewheel 75 onto the hollow shaft 45, the first sun gear 49, the planet gear, connected to the hollow shaft 45 with screws 77 51, which consists of the two interconnected gears 79, 80, the second Sun gear 53, the freewheel hub 55, the shaft 57, the bevel gears 39, 40 and the drive shaft 81 to thread roller 13.
  • a Seal 83 is provided. There is also one between the hollow shaft 45 and the shaft 57 Seal 85 arranged.
  • the embroidery machine works as follows:
  • the control unit 25 delivers one of the data for control signal determined for each stitch. This is applied to the electromagnetic brake 59 applied to generate a braking effect corresponding to the control signal. Simultaneously with the movement of the needles against the embroidery floor Swivel lever 43 swiveled. This causes a rotation of the hollow shaft 45 and thus of the first sun gear 49. As long as the thread tension on the thread roller 13 is not a specific one Has reached extent, but the thread roller 13 and thus also with it over the shaft 57 and the freewheel 55, the second sun gear 53 is in operative connection.
  • the Brake 59 are designed as a mechanically actuable brake, which by a Actuator, e.g. an electric motor that can be actuated to different degrees. It would also be possible to move from the gate movement mechanically to the control derive a brake 59.
  • a mechanism as in DE 410516 or DE 692218 describes, instead of the thread roller, the brake 59 are controlled.
  • the coupling device 31 is used to generate a supporting torque for the thread roller 13, if this by embroidery by pulling around the thread roller 13 looped needle threads is rotated.
  • The serves as the drive Needle tappet drive shaft 41, which by means of the lever 36 and the linkage 42 Can pivot lever 43 back and forth. This is therefore the case with every machine cycle moved back and forth synchronously with the needle tappets.
  • An idle ensures that the Clutch 31 has a supporting torque in one direction only via the transmission 39.40 can apply to the thread roller 13. Because in the machine cycle regardless of the stitch width The cycle section of the same length is always available for each stitch around the thread roller 13 threads wound with larger stitch widths with larger Speed rotates than with small stitch widths.
  • the clutch 31 is controllable, however the size of the supporting torque due to that contained in embroidery programs Data for the stitch to be executed so that the tension in the Needle threads can be kept practically the same for all stitch widths and the risk of Thread breaks are largely avoided.

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

Abstract

In a process to form a stitch, a sewing machine has a supply of thread (11) withdrawn over a roller (13) aided by a roller power drive. The torque applied to the roller is regulated especially in accordance with the stitching program data for each individual type of stitch. Also claimed is a sewing machine with a clutch (31) drive to the roller (13). The roller clutch is engaged by thread movement of the roller. The roller is powered by the needle plunger drive shaft (41), moving the swivel lever (43) and rod (42) synchronised with the needle action. When thread is static the clutch ensures that torque can only be applied in one direction via the gear (39,40) to the roller (13). Because the same time lapse for each cycle is always the same irrespective of the stitch length, the roller turns at higher speeds for longer stitches than shorter. The clutch is regulated in accordance with the type of stitch required and maintains the thread tension irrespective of the stitch length.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Stichbildung bei einer eine Fadenwalze oder Fadenrollen aufweisenden Stickmaschine, bei welcher Faden von den Spulen durch Fadenzug mit Unterstützung eines auf die Fadenwalze oder die Fadenrollen wirkenden Drehmoments abgezogen wird.The present invention relates to a method for stitch formation in a thread roller or thread reel embroidery machine, in which thread from the bobbins through Thread tension with the support of one acting on the thread roller or the thread rollers Torque is subtracted.

In den letzten Jahren ist die Geschwindigkeit, mit welcher Schifflistickmaschinen arbeiten, ständig gesteigert worden. Arbeiteten im Jahre 1996 Schifflistickmaschinen mit mehr als 200 Stichen pro Minute, so sind es gegenwärtig bis zu 600 Stiche pro Minute. Um dies zu ermöglichen, ist es notwendig, der Tendenz von Fadenbrüchen entgegenzuwirken. Zu diesem Zwecke sind bereits früh verschiedene Massnahmen getroffen worden. So ist aus der GB 177 317 eine angetriebene Fadenwalze für einen positiven Fadenvorschub zu den Nadeln bekannt, mit der bei der Fadenlieferung die Spannung im Nadelfaden möglichst konstant gehalten und die grossen Schwankungen in der Spannung, denen die Nadeln ausgesetzt sind, minimiert werden sollen. Um zu vermeiden, dass die Nadeln im Zusammenspiel mit den Fadenleitern den Nadelfaden von den Spulen abziehen und dabei die Fadenwalze in Bewegung versetzen müssen, was zu hohen Spannungen im Faden und in den Nadeln führt, wird die Fadenwalze intermittierend rotiert. Dies geschieht wie folgt: Wenn die Nadeln gegen den Stickboden bewegt werden, wird, um Spannungsspitzen in den Nadelfäden zu vermeiden, die Fadenwalze durch einen Antrieb um ein vorbestimmbares Mass gedreht. Dadurch wird Faden für die Stichbildung geliefert. Durch einen Verstellhebel kann der Winkel, um welche die Fadenwalze gedreht wird, eingestellt werden.In recent years, the speed at which Schiffli embroidery machines work constantly increased. In 1996 she worked with over 200 embroidery machines Stitches per minute, currently there are up to 600 stitches per minute. To do this enable, it is necessary to counteract the tendency of thread breaks. To this Various measures were taken at an early stage for this purpose. So is from GB 177 317 a driven thread roller for a positive thread feed to the needles is known, with which the tension in the needle thread is kept as constant as possible when the thread is delivered and minimizes the large fluctuations in tension to which the needles are exposed should be. To avoid the needles interacting with the thread guides Pull the needle thread from the bobbins, thereby setting the thread roller in motion need, which leads to high tensions in the thread and in the needles, becomes the thread roller rotates intermittently. This happens as follows: When the needles hit the embroidery base is moved to avoid tension peaks in the needle threads Thread roller rotated by a drive by a predetermined amount. This will Thread supplied for stitch formation. By means of an adjustment lever, the angle at which the thread roller is rotated.

Da aber die für einen Stich benötigte Fadenlänge von Stich zu Stich verschieden sein kann, sehen die DE 410 516 und die DE 692 218 einen Mechanismus vor, um die Fadenwalze je nach Stichweite mehr oder weniger zu drehen. Statt die Fadenwalze mit mechanischen Mitteln zu steuern, schlägt die EP 0 014 897 einen unabhängig von der Fadenspannung arbeitenden elektrischen Stellantrieb für den Antrieb der Fadenwalze vor. Dieser Stellantrieb wird von der Steuereinheit gesteuert, um die Fadenwalze von Stich zu Stich um das von der Steuervorrichtung vorgegebene Mass zu drehen. Auch die EP 0 666 351 sieht als Liefereinheit eine von der Steuereinheit gesteuerte Fadenwalze vor, welche entsprechend der auf das Stickgut aufzubringenden Fadenmenge gedreht wird. Dies scheint sich jedoch nicht bewährt zu haben, denn verschiedene Besitzer von Maschinen des Typs von EP 0 666 351 haben in ihre Maschinen nachträglich einen Freilauf eingebaut, welcher es erlaubt, durch Fadenzug die Fadenwalze zu drehen, wenn die gelieferte Fadenmenge knapp bemessen ist.But since the thread length required for a stitch can vary from stitch to stitch, see DE 410 516 and DE 692 218 a mechanism to the thread roller depending To turn the stitch width more or less. Instead of the thread roller with mechanical means too control, EP 0 014 897 suggests a person working independently of the thread tension electric actuator for driving the thread roller. This actuator is from the Control unit controls the thread roller from stitch to stitch around that of the Control device to rotate predetermined dimension. EP 0 666 351 also sees it as a delivery unit a thread roller controlled by the control unit, which according to the Amount of thread to be embroidered is rotated. However, this does not seem to be working to have, because different owners of machines of the type of EP 0 666 351 have in their Machines subsequently installed a freewheel, which allows the thread to be pulled Turn the thread roller when the amount of thread supplied is scarce.

In der EP 0 906 982, Spalte 2, Zeilen 17 bis 30 wird ausgeführt, dass es praktisch schwierig oder unmöglich ist, eine genaue Berechnung der auf das Stickgut aufzubringenden Fadenmenge vorzunehmen, denn diese hängt nicht nur von der Stichweite, sondern auch von anderen Faktoren, wie z.B. der Stoffdicke und der Stichart ab. Wird aber zuviel Faden geliefert, so entsteht eine lose Stickerei. Wird jedoch eine zu knappe Fadenmenge geliefert, so entsteht eine zu straffe Stickerei und zudem besteht die Gefahr eines Fadenbruchs. Um den Nachteil des Verfahrens gemäss der EP 0 666 351 zu vermeiden, wird deshalb in der EP 0 906 982 vorgeschlagen, die Fadenwalze so zu steuern, dass nur eine Teilmenge des für den Stich notwendigen Fadens geliefert wird und dass die restliche Menge durch Fadenzug abgezogen wird. Um dies zu ermöglichen, wird der Einbau eines Freilaufes zwischen Fadenwalzenantrieb und Fadenwalze vorgesehen. Wenn der positive Antrieb der Fadenwalze aufhört, kann die Fadenwalze daher durch Fadenzug weitergedreht werden.In EP 0 906 982, column 2, lines 17 to 30 it is stated that it is practically difficult or it is impossible to calculate the exact amount to be applied to the embroidery Amount of thread, because this depends not only on the stitch width, but also on other factors such as the fabric thickness and stitch type. But it becomes too much thread delivered, so there is a loose embroidery. However, if the thread quantity is too short, so the embroidery is too tight and there is also a risk of thread breakage. To the To avoid the disadvantage of the method according to EP 0 666 351 is therefore EP 0 906 982 proposed to control the thread roller so that only a subset of that for the stitch necessary thread is supplied and that the remaining amount is drawn off by thread pull becomes. To make this possible, the installation of a freewheel between Thread roller drive and thread roller provided. If the positive drive of the thread roller ceases, the thread roller can therefore be rotated further by pulling the thread.

Während bei der Kategorie von Stickmaschinen, welche vorher näher beschrieben wurde, eine bestimmte Fadenlänge durch positiven Antrieb der Fadenwalze geliefert wird, muss bei der nachfolgend beschriebenen Kategorie von Stickmaschinen der Faden von der Spule durch Fadenzug mit Unterstützung eines auf die Fadenwalze wirkenden Drehmoments abgezogen werden. Bei Maschinen dieser Kategorie muss keine Berechnung der von Stich zu Stich auf das Stichgut aufzubringenden Fadenmenge erfolgen, denn es findet kein Fadenvorschub statt. Der Faden wird vielmehr abgezogen, wobei aber auf die Fadenwalze ein unterstützendes Drehmoment ausgeübt wird, das die Entstehung von unzulässig hohen Spannungen im Nadelfaden verhindert.While in the category of embroidery machines, which was described in more detail earlier, one certain thread length is supplied by positive drive of the thread roller must at Category of embroidery machines described below for thread from the bobbin Thread pulled with the support of a torque acting on the thread roller become. For machines in this category there is no need to calculate from stitch to stitch the amount of thread to be applied is done because there is no thread feed. Rather, the thread is drawn off, but with a supportive on the thread roller Torque is exerted, which causes the creation of impermissibly high voltages in the Prevents needle thread.

Als erstes Beispiel kann die CH 115 089 angeführt werden. In dieser Patentschrift wird ausdrücklich die Aufgabe gestellt, den Drehwiderstand der Fadenwalze von Schiffchenstickmaschinen zu vermindern. Dabei wird darauf hingewiesen, dass dieser Widerstand folgende Ursachen hat:

  • 1. Reibung der Fadenwalze in den Lagern
  • 2. Trägheitswiderstand der Massen
  • 3. Nachziehen des Nadelfadens ab den Spulen
  • 4. Wirkung der regulierbaren Fadenwalzenbremse
    • The first example is CH 115 089. This patent expressly sets the task of reducing the rotational resistance of the thread roller of shuttle embroidery machines. It is pointed out that this resistance has the following causes:
  • 1. Friction of the thread roller in the bearings
  • 2. Mass inertia resistance
  • 3. Pull the needle thread from the bobbins
  • 4. Effect of the adjustable thread roller brake

    • Zur Lösung der gestellten Aufgabe wird dann von der CH 115 089 eine Vorrichtung zur Verminderung des zum Drehen der Fadenwalze nötigen Fadenzugs vorgeschlagen, bei welcher unter Federkraft in Richtung des Fadenablaufs auf die Fadenwalze wirkende Organe mitwirken. Zu diesem Zweck wird von einem regelmässig bewegten Maschinenteil, z.B. dem grossen Fadenleiter, eine Feder gespannt, welche dann ein unterstützendes Drehmoment liefert, das den zum Drehen der Fadenwalze nötigen Fadenzug vermindert. Die Verwendung einer Feder hat den Vorteil, dass sie das unterstützende Drehmoment unabhängig davon liefert, wie schnell die Fadenwalze durch den Fadenzug gedreht wird. Es ist nämlich zu beachten, dass bei grossen Stichweiten die Fadenwalze durch Fadenzug schneller gedreht wird als bei kleinen Stichweiten.
    Als Nachteil dieser Vorrichtung erweist sich aber der Umstand, dass das unterstützende Drehmoment nur durch Auswechseln der Feder verändert werden kann.    To solve the problem, CH 115 089 then proposes a device for reducing the thread tension necessary for rotating the thread roller, in which organs act under spring force in the direction of the thread flow on the thread roller. For this purpose, a spring is tensioned by a regularly moving machine part, for example the large thread guide, which then supplies a supporting torque which reduces the thread tension required to turn the thread roller. The advantage of using a spring is that it delivers the supporting torque regardless of how fast the thread roller is rotated by the thread pull. It should be noted that with large stitch widths, the thread roller is turned faster by thread pull than with small stitch widths.
    A disadvantage of this device is the fact that the supporting torque can only be changed by changing the spring.

    Die EP 0 795 638 beschreibt ebenfalls ein Verfahren, bei welchem der Vorderfaden von der Spule durch Fadenzug mit Unterstützung eines auf die Fadenwalze wirkenden Drehmoments abgezogen wird. Dieses unterstützende Drehmoment wird aber nicht von einer Feder, sondern von einem Motor oder dem Hauptantrieb geliefert. Dies setzt voraus, dass der Motor oder der Hauptantrieb die Vorrichtung zur Durchführung dieses Verfahrens mit einer auch für grosse Stichweiten ausreichenden Geschwindigkeit antreibt. Die Vorrichtung sieht eine Art von Schlupfkupplung vor, mit welcher manuell das auf die Fadenwalze ausgeübte maximale Drehmoment eingestellt werden kann. Diese Kupplung weist die Form eines Differenzialgetriebes mit einem ersten und einem zweiten Sonnenrad und einem Planetenrad auf, wobei der Antriebsstrang von der Antriebsvorrichtung zur Fadenwalze über das erste Sonnenrad, das Planetenrad zum zweiten Sonnenrad und von dort über einen Freilauf zur Fadenwalze verläuft. Das Planetenrad ist auf einer um eine Achse drehbare Bremsscheibe angeordnet, und eine Bremsvorrichtung ist vorgesehen, mit welcher eine Bremskraft auf die drehbare Scheibe ausgeübt werden kann. Der Freilauf dient dazu, eine weitere Bewegung der Fadenwalze durch Fadenzug zu ermöglichen, wenn kein unterstützendes Drehmoment mehr wirksam ist. Die Bremsvorrichtung besteht im Wesentlichen aus einem verschwenkbaren Bremshebel, welcher mittels einer Bremsbacke auf die Peripherie der Bremsscheibe einwirken kann. Mit einer Stellschraube kann eine Feder, die auf den Bremshebel einwirkt, mehr oder weniger stark gespannt werden, um den Druck der Bremsbacke auf die Bremsscheibe auf das benötigte Mass einzustellen. EP 0 795 638 also describes a method in which the front thread of the Bobbin by thread tension with the support of a torque acting on the thread roller is subtracted. This supporting torque is not from a spring, but delivered by an engine or the main drive. This assumes that the engine or the main drive the device for performing this method with one too drives sufficient speed for large stitch widths. The device sees one Type of slip clutch, with which the manually exerted on the thread roller maximum torque can be set. This coupling has the shape of a Differential gear with a first and a second sun gear and a planet gear on, the drive train from the drive device to the thread roller over the first Sun gear, the planet gear to the second sun gear and from there via a freewheel to Thread roller runs. The planet gear is on a brake disc rotatable about an axis arranged, and a braking device is provided with which a braking force on the rotatable disc can be exercised. The freewheel serves a further movement of the Allow thread roller by thread pull when there is no more supporting torque is effective. The braking device consists essentially of a pivotable Brake lever, which acts on the periphery of the brake disc by means of a brake shoe can. A spring that acts on the brake lever can do more or with a set screw be less tensioned to the pressure of the brake shoe on the brake disc on the set the required dimension.

    Vorrichtungen gemäss der EP 0 795 638 mit Motorantrieb sind unter der Bezeichnung "Servo-Feed" bei Stickmaschinen im Einsatz. Sie erlauben ein Sticken mit bis zu 600 Stichen pro Minute. Als nachteilig hat sich aber erwiesen, dass die Vorrichtung mit Motorantrieb relativ teuer ist. Mit dem Motorantrieb ergeben sich auch gewisse Synchronisationsprobleme.Devices according to EP 0 795 638 with motor drive are known under the name "Servo-Feed" in use with embroidery machines. They allow embroidery with up to 600 stitches per Minute. It has proven to be disadvantageous, however, that the motor-driven device is relative is expensive. There are also certain synchronization problems with the motor drive.

    Es ist die Aufgabe der Erfindung, ein Verfahren und eine Vorrichtung zu schaffen, welche den Erfordernissen der Stichbildung besser Rechnung trägt als dies bei den bekannten Verfahren und Vorrichtungen der Fall ist. Auch sollte die Vorrichtung kostengünstig herstellbar und einfach zu bedienen sein.It is the object of the invention to provide a method and an apparatus which better takes into account the requirements of stitch formation than with the known ones Methods and devices is the case. The device should also be inexpensive producible and easy to use.

    Das erfindungsgemässe Verfahren ist dadurch gekennzeichnet, dass die Grösse des unterstützenden Drehmoments aufgrund von im Stickprogramm enthaltenen Daten für den jeweils auszuführenden Stich; insbesondere den für die Stichweite massgebenden Daten, bemessen wird.The method according to the invention is characterized in that the size of the supporting torque based on data contained in the embroidery program for the stitch to be executed in each case; especially the data relevant for the stitch width, is measured.

    Das erfindungsgemässe Verfahren geht von der Erkenntnis aus, dass der Fadenzug, der notwendig ist, um die Fadenwalze zu drehen, bei grossen Stichweiten stärker ist als bei kleinen Stichweiten. Im Maschinenzyklus steht nämlich für jeden Stich immer ein gleichlanger Zyklusabschnitt zur Verfügung, so dass die Geschwindigkeit, mit welcher Faden abgezogen wird, von der Stichweite abhängt. Die Fadenwalze wird daher je nach Stichweite mehr oder weniger stark beschleunigt. In der Praxis wird allerdings für grosse Stichweiten die Maschinengeschwindigkeit in der Regel etwas reduziert. Trotzdem besteht natürlich die Gefahr, dass bei grossen Stichweiten im Nadelfaden Kräfte entstehen, welche zum Reissen des Fadens führen können. Diese Gefahr wird durch das erfindungsgemässe Verfahren weitgehend vermieden, weil das unterstützende Drehmoment automatisch aufgrund der im Stickprogramm enthaltenen Daten für jeden jeweils auszuführenden Stich individuell bemessen wird.The method according to the invention is based on the knowledge that the thread tension, the is necessary to turn the thread roller, with larger stitch widths is stronger than with small stitch widths. In the machine cycle there is always the same length for each stitch Cycle section available, so the speed at which thread is drawn off depends on the stitch width. The thread roller is therefore more or depending on the stitch width accelerated less. In practice, however, is used for large stitch ranges Machine speed is usually somewhat reduced. Nevertheless, of course there is Danger of large forces in the needle thread which cause tearing of the thread can lead. The method according to the invention eliminates this danger largely avoided because the supporting torque automatically due to the im Embroidery program contains data for each stitch to be executed individually is measured.

    Es ist möglich, bei der Bemessung der Grösse des unterstützenden Drehmoments zusätzlich auch die im Stickprogramm enthaltenen Daten betreffend die Stickart zu berücksichtigen, so dass der Stich der Stichart entsprechend mehr oder weniger stark angezogen wird.It is possible to additionally measure the size of the supporting torque also to take into account the data contained in the embroidery program regarding the type of embroidery, so that the stitch is drawn more or less according to the type of stitch.

    Zweckmässigerweise ist die Grösse des unterstützenden Drehmoments, die aus den im Programm enthaltenen Daten ermittelt wird, manuell vergrösser- oder verkleinerbar. Dies ermöglicht eine Feinregulierung und Anpassung an die Eigenschaften des zu bestickenden Stoffes, bzw. eine Anpassung an die Anzahl der stickenden Stickstellen.Appropriately, the size of the supporting torque, which from the in Data contained in the program is determined, can be enlarged or reduced manually. This enables fine adjustment and adaptation to the properties of the embroidery Fabric, or an adjustment to the number of embroidering embroidery points.

    Das Verfahren kann derart beschaffen sein, dass nach Wegfall des unterstützenden Drehmoments die Weiterbewegung der Fadenwalze durch Fadenzug allein erfolgt. Bei dieser Weiterbewegung kann die Fadenwalze durch die Fadenwalzenbremse entsprechend der Stichart mehr oder weniger stark gebremst werden. Bei den Sticharten, z.B. dem Steppstich, bei denen der Schiffchenfaden auf die Vorderseite der Stickerei gezogen wird, wird relativ stark gebremst. Umgekehrt wird bei allen Sticharten, also z.B. dem Plattstich, bei denen der Schiffchenfaden keinesfalls auf die Vorderseite gezogen werden darf, weniger stark gebremst.The procedure can be designed in such a way that after the Torque the further movement of the thread roller takes place by thread pull alone. At this The thread roller can move further through the thread roller brake according to the Stitch type are more or less braked. For stitch types, e.g. the lockstitch, where the shuttle thread is pulled onto the front of the embroidery becomes relative heavily braked. The reverse is true for all stitch types, e.g. the satin stitch where the The shuttle thread must never be pulled to the front, braked less.

    Die Erfindung betrifft auch eine Stickmaschine mit einer Steuereinheit, welche die Maschine entsprechend dem eingegebenen Stickprogramm steuert, Stickwerkzeugen, welche von der Antriebseinheit antreibbar sind, einer Fadenwalze, über welche der Faden von der Spule zur Nadel verläuft und welche durch Fadenzug antreibbar ist, einer Fadenwalzenbremse, und einer von der Antriebseinheit oder einem Motor antreibbaren, an die Fadenwalze angeschlossenen Kupplung zum Anlegen eines unterstützenden Drehmoments an die durch Fadenzug antreibbare Fadenwalze. Diese Stickmaschine ist erfindungsgemäss dadurch gekennzeichnet, dass die Steuereinheit Mittel aufweist, welche aus den Daten des Stickprogramms die Stichweite des jeweiligen Stichs ermittelt und daraus mittels einer vorgegebenen Kurve ein Steuersignal oder eine Steuerbewegung erzeugt, und dass die Kupplung derart ausgebildet ist, dass sie auf Grund des Steuersignals oder der Steuerbewegung das für die jeweilige Stichweite erforderliche unterstützende Drehmoment erzeugt.The invention also relates to an embroidery machine with a control unit which controls the machine controls embroidery tools according to the entered embroidery program Drive unit can be driven, a thread roller, via which the thread from the bobbin to Needle runs and which can be driven by thread tension, a thread roller brake, and one driven by the drive unit or a motor to the thread roller connected coupling for applying a supporting torque to the through Thread pull drivable thread roller. According to the invention, this embroidery machine is thereby characterized in that the control unit has means which from the data of the Embroidery programs determine the stitch width of the respective stitch and use a predetermined curve generates a control signal or a control movement, and that the Coupling is designed such that it is based on the control signal or Control movement the supporting torque required for the respective stitch width generated.

    Moderne Stickmaschinen besitzen eine elektronische Steuereinheit, welche in der Lage ist, aufgrund eines Stickprogramms insbesondere die Bewegungen des Gatters zu steuern. Des weiteren kann die Steuereinheit noch viele Nebenaufgaben erfüllen, z.B. aufgrund des Stickprogramms für jeden Stich die Stichweite errechnen. Diese Daten können dann verwendet werden, um den Fadenverbrauch anzuzeigen. Mit der vorliegenden Vorrichtung werden die Daten betreffend die Stichweite benutzt, um das Steuersignal oder die Steuerbewegung für die Kupplung zu erzeugen, welche das unterstützende Drehmoment an die Fadenwalze anlegt. Modern embroidery machines have an electronic control unit, which is able to to control the movements of the gate based on an embroidery program. Of the control unit can also perform many additional tasks, e.g. due to the Calculate the stitch width for each stitch. This data can then used to display thread consumption. With the present device the stitch distance data is used to control the signal or Generate control motion for the clutch, which is the supporting torque the thread roller creates.

    Die Steuereinheit kann weiter Mittel aufweisen, welche aus den Daten des Stickprogramms betreffend die Stichart ein Steuersignal für die Fadenwalzenbremse erzeugt. Dadurch kann die Fadenwalzenbremse gesteuert werden, um je nach Stichart den Nadelfaden mehr oder weniger stark anzuziehen, wenn das unterstützende Drehmoment wegfällt und die Fadenwalze allein durch Fadenzug entgegen der Bremswirkung der Fadenwalzenbremse weiterbewegt wird. Zweckmässigerweise ist zwischen der Kupplungsvorrichtung und der Fadenwalze ein Freilauf angeordnet, damit die Kupplung nicht bremsend wirkt, wenn sie kein unterstützendes Drehmoment liefert.The control unit can also have means which are derived from the data of the embroidery program generated a control signal for the thread roller brake regarding the stitch type. This can the thread roller brake can be controlled to the needle thread more or depending on the stitch type to tighten less when the supporting torque is lost and the Thread roller solely by pulling the thread against the braking effect of the thread roller brake is moved on. It is expedient between the coupling device and the Thread roller arranged a freewheel so that the clutch does not brake when it does not provide any supporting torque.

    Es ist auch möglich, die Kupplungsvorrichtung zugleich als Fadenwalzenbremse wirken zu lassen. In diesem Fall kann auf die separate Fadenwalzenbremse verzichtet werden. Diese Lösung bietet sich insbesondere für kleine Maschinen an. Es ist ferner möglich, eine Fadenwalzenbremse vorzusehen und die Kupplung als zusätzliche Fadenwalzenbremse wirken zu lassen.It is also possible for the coupling device to act as a thread roller brake at the same time to let. In this case, the separate thread roller brake can be dispensed with. This The solution is particularly suitable for small machines. It is also possible to use a To provide thread roller brake and the clutch as an additional thread roller brake let it work.

    Eine zweckmässige Ausführungsform der Erfindung sieht vor, dass die Kupplungsvorrichtung die Form eines Differenzialgetriebes mit einem ersten und einem zweiten Sonnenrad und einem auf einem Planetenradträger angeordnete Planetenrad aufweist, wobei der Antriebsstrang von der Antriebsvorrichtung zur Fadenwalze über das erste Sonnenrad, das Planetenrad zum zweiten Sonnenrad verläuft, dass der Planetenradträger mit einer um eine Achse drehbaren Bremsscheibe gekuppelt ist, und dass eine durch die Steuereinheit steuerbare Bremse vorgesehen ist, mit welcher eine Bremskraft auf die drehbare Bremsscheibe ausgeübt werden kann. Die Bremse, z.B. elektromagnetische Bremse, ist zweckmässigerweise koaxial zu den Sonnenrädem angeordnet und weist ein stationäres Teil und ein rotierbares Teil auf, welches mit der drehbaren Bremsscheibe gekoppelt ist. Diese Ausbildung der Bremse erlaubt eine gute Regulation der Bremskraft.An expedient embodiment of the invention provides that the Coupling device in the form of a differential gear with a first and a second sun gear and a planet gear arranged on a planet gear carrier has, the drive train from the drive device to the thread roller over the first sun gear, the planet gear runs to the second sun gear that the Planet carrier is coupled with a brake disc rotatable about an axis, and that a brake controllable by the control unit is provided, with which a braking force can be exerted on the rotatable brake disc. The brake, e.g. electromagnetic Brake, is expediently arranged coaxially to the sun gears and has stationary part and a rotatable part, which with the rotatable brake disc is coupled. This design of the brake allows good regulation of the braking force.

    Vorteilhaft weist die Kupplungsvorrichtung ein Gehäuse auf, in welchem mindestens die Bremse, z.B. elektromagnetische Bremse, in einem Oelbad angeordnet ist Diese Ausbildung ist besonders vorteilhaft, wenn die Kupplung von der Antriebseinheit, z.B. mittels einer Kurvenscheibe, antreibbar ist. In diesem Fall ist die Antriebsgeschwindigkeit für kleine und grosse Stichweiten immer die gleiche. Bei kleinen Stichweiten entsteht daher beim Bremsen viel Schlupf und dadurch relativ viel Wärme. Diese wird dann über das Oelbad zum Gehäuse abgeführt und von diesem abgestrahlt. Des weiteren garantiert das Oelbad eine gleichbleibende Bremswirkung und einen geringen Abrieb der Reibungsflächen. Es ist möglich, für den Antrieb statt einer Kurve einen separaten Motor zu verwenden.The coupling device advantageously has a housing in which at least the Brake, e.g. electromagnetic brake, arranged in an oil bath This training is particularly advantageous if the coupling is removed from the drive unit, e.g. by means of a Cam, is drivable. In this case, the drive speed is small and large stitch widths always the same. With small stitch widths therefore occurs when braking a lot of slip and therefore a lot of warmth. This then becomes the housing via the oil bath dissipated and radiated from this. Furthermore, the oil bath guarantees one constant braking effect and low abrasion of the friction surfaces. It is possible to use a separate motor for the drive instead of a curve.

    Die Kupplungsvorrichtung ist aber besonders kostengünstig, wenn der Antrieb nicht durch einen separaten Motor erfolgt, sondern von der Antriebseinheit z.B. mittels einer Kurve, intermittierend angetrieben wird. Besonders vorteilhaft erweist sich der Antrieb durch die Kurve für die Nadelbewegung. Die Kupplungsvorrichtung kann mittels eines Hebelsystems und eines Freilaufs mit dem von der Kurve für die Nadelbewegung betätigbaren Nadelstössel gekoppelt sein. Dies stellt eine besonders einfache und preisgünstige Ausführung dar, weil dann auch der Aufwand für eine separate Kurve entfällt Der Nadelstössel kann mittels einer Kurbelstange an einen Schwenkhebel angelenkt sein, welche über den Freilauf mit dem ersten Sonnenrad gekoppelt ist.The coupling device is particularly inexpensive if the drive is not through a separate motor, but from the drive unit e.g. by means of a curve, is driven intermittently. The drive has proven to be particularly advantageous Needle movement curve. The coupling device can by means of a lever system and a freewheel with the needle plunger which can be actuated by the curve for the needle movement be coupled. This represents a particularly simple and inexpensive version because then there is also no need for a separate curve Crank rod to be hinged to a pivot lever, which over the freewheel with the first Sun gear is coupled.

    Ein Ausführungsbeispiel der Erfindung wird nun unter Bezugnahme auf die Zeichnung beschrieben. Es zeigt:

    Fig. 1
    eine schematische Darstellung der Stichbildungswerkzeuge,
    Fig. 2
    eine schematische Darstellung der bei der Durchführung des Verfahrens beteiligten Organe,
    Fig. 3
    die Erzeugung des Steuersignals,
    Fig. 4a
    die Kupplung und ihr Antrieb durch die Nadelstösselbetätigungswelle von vom betrachtet,
    Fig. 4b
    die Kupplung und ihr Antrieb von hinten betrachtet, und
    Fig. 5
    einen Schnitt durch die Kupplung von Figur 3.
    An embodiment of the invention will now be described with reference to the drawing. It shows:
    Fig. 1
    a schematic representation of the stitch formation tools,
    Fig. 2
    a schematic representation of the organs involved in the implementation of the method,
    Fig. 3
    the generation of the control signal,
    Fig. 4a
    the clutch and its drive through the needle stem actuating shaft viewed from the front,
    Fig. 4b
    the clutch and its drive viewed from behind, and
    Fig. 5
    a section through the coupling of Figure 3.

    Figur 1 zeigt schematisch die Anordnung der Stickwerkzeuge, wie sie in der Regel bei Schifflistickmaschinen zur Anwendung gelangen. Diese Figur ist im wesentlichen dem Werk von Schöner, Spitzen, Enzyklopädie der Spitzentechniken, VEB Fachbuchverlag Leipzig 1980, Seiten 320 bis 325 entnommen worden, wo der Stichbildungsvorgang, wie er bei Schifflimaschinen zur Anwendung gelangt, beschrieben wird. Da dies zum Fachwissen jedes Stickereitechnikers gehört, kann auf eine detaillierte Beschreibung des Stichbildungsvorgangs verzichtet, bzw. auf das zitierte Werk von Schöner verwiesen werden. Zusammengefasst kann aber folgendes festgehalten werden: Der Vorderfaden 11, auch Nadelfaden genannt, führt von der Fadenspule 12 über die Fadenwalze 13 zum kleinen Fadenleiter 14 und von dort über den grossen Fadenleiter 15 zur Nadel 16. Der Hinterfaden 21, der von der Bobine 22 im Schiffchen 23 geliefert wird, wird bei der Stichbildung mit dem Schiffchen 23 durch eine Schlaufe des Vorderfadens 11 hindurchgeführt, welche hinter dem Stickboden 18 beim Zurückziehen der Nadel entsteht. Der grosse Fadenleiter dient dazu, kurzzeitig die für die Schlaufenbildung notwendige Fadenmenge zur Verfügung zu stellen.Figure 1 shows schematically the arrangement of the embroidery tools, as they usually do Ship embroidery machines are used. This figure is essentially the work of beautiful, lace, encyclopedia of advanced techniques, VEB Fachbuchverlag Leipzig 1980, Pages 320 to 325 were taken from where the stitch formation process, as in Schiffli machines used, is described. Since this is the expertise of everyone An embroidery technician belongs to a detailed description of the stitch formation process waived or referred to the work cited by Schoener. In summary, but the following are noted: The front thread 11, also called needle thread, leads from the bobbin 12 over the thread roller 13 to the small thread conductor 14 and from there on large thread guide 15 to the needle 16. The rear thread 21, from the bobbin 22 in the boat 23 is delivered, is in the stitch formation with the boat 23 through a loop of the Front thread 11 passed, which behind the embroidery floor 18 when retracting the Needle arises. The large thread guide is used for a short time for loop formation to provide the necessary amount of thread.

    Bei jedem Stich wird je nach Stichweite mehr oder weniger Nadelfaden von der Fadenspule 12 abgezogen, wobei durch den Fadenzug die Fadenwalze 13 entgegen der Kraft der Fadenwalzenbremse 24 (Fig. 2) bewegt wird. Damit in den Nadelfäden 11 keine zu hohe Fadenspannung entsteht, wird an die Fadenwalze 13 ein unterstützendes Drehmoment angelegt, dessen Grösse aufgrund von im Stickprogramm enthaltenen Daten für den jeweils auszuführenden Stich bemessen wird. Dadurch wird dem Umstand Rechnung getragen, dass bei grossen Stichweiten die Fadenwalze mehr beschleunigt werden muss als bei kleinen Stichweiten. Dies wird nachfolgend unter Bezugnahme auf Fig. 2 näher beschrieben.With each stitch, depending on the stitch width, more or less needle thread is removed from the thread spool 12 deducted, the thread roller 13 against the force of the Thread roller brake 24 (Fig. 2) is moved. So that not too high in the needle threads 11 Thread tension arises, a supporting torque is applied to the thread roller 13 created, the size of which is based on the data contained in the embroidery program for each stitch to be executed is dimensioned. This takes into account the fact that with large stitch widths the thread roller must be accelerated more than with small ones Stitch widths. This is described in more detail below with reference to FIG. 2.

    Die schematische Darstellung von Figur 2 zeigt die bei der Durchführung des Verfahrens beteiligten Organe. Die Steuereinheit 25 umfasst einen Computer, in welchen das Stickprogramm eingegeben wird. Der Computer erzeugt die notwendigen Steuersignale zur Steuerung der Motoren 28,29,30, der Kupplungsvorrichtung 31 und der Fadenwalzenbremse 24 der Stickmaschine. So steuert die Steuereinheit den Motor 28 für den Hauptantrieb und die Motoren 29,30 für den Gatterantrieb. Im Betrieb liefert also der Computer für jeden Stich Informationen für die Gatterbewegung in waagrechter und vertikaler Richtung. Die gleichen Informationen werden benützt, um das Steuersignal für die Kupplungsvorrichtung 31 zu erzeugen, welches an die Fadenwalze 13 ein unterstützendes Drehmoment anlegt, das je nach Stichweite verschieden gross ist, nämlich grösser für grosse Stichweiten als für kleine Stichweiten, bei denen die Fadenwalze weniger beschleunigt werden muss.The schematic representation of FIG. 2 shows that when the method is carried out organs involved. The control unit 25 comprises a computer in which the Embroidery program is entered. The computer generates the necessary control signals Control of the motors 28, 29, 30, the coupling device 31 and the thread roller brake 24 of the embroidery machine. So the control unit controls the motor 28 for the main drive and Motors 29.30 for the gate drive. In operation, the computer delivers for every stitch Information for horizontal and vertical gate movement. The same Information is used to obtain the control signal for clutch device 31 generate, which applies a supporting torque to the thread roller 13, depending on Stitch width is different, namely larger for large stitch widths than for small ones Stitches where the thread roller has to be accelerated less.

    Die Erzeugung des Steuersignals wird in Fig. 3 dargestellt. Aus den Informationen für die Gatterbewegung in x- und y-Richtung wird in Block 33 die Stichweite ermittelt. Die Werte für das unterstützende Drehmoment für verschiedene Stichweiten sind in Block 35 gespeichert Diese Werte sind durch Versuche ermittelt worden. Diese Werte ergeben eine Kurve, die anfangs linear mit der Stichweite verläuft und dann mit grösser werdender Stichweite abflacht Das Ausgangssignal von Block 35 kann mittels der Justiervorrichtung 37 manuell vergrössert und verkleinert werden, um gegebenenfalls das unterstützende Drehmoment zu erhöhen oder zu erniedrigen. Es leuchtet ein, dass das Drehmoment nicht so gross sein darf, um die Fadenwalze 13 auch beim Fehlen von Fadenzug zu drehen, weil sonst mehr Faden geliefert würde als für den Stich notwendig ist. Es ist dem Fachmann klar, dass der Computer der Steuereinheit 25 programmiert werden kann, um die in Fig. 3 dargestellten Operationen auszuführen.The generation of the control signal is shown in FIG. 3. From the information for the Gate movement in the x and y directions, the stitch width is determined in block 33. The values for the supporting torque for different stitch widths are stored in block 35 These values have been determined by experiments. These values result in a curve that initially linear with the stitch width and then with increasing stitch width flattened The output signal from block 35 can be adjusted manually using the adjusting device 37 be enlarged and reduced in order to increase the supporting torque if necessary increase or decrease. It is obvious that the torque must not be so great to turn the thread roller 13 even in the absence of thread tension, because otherwise more thread would be delivered than is necessary for the stitch. It is clear to the person skilled in the art that the computer the control unit 25 can be programmed to perform the operations shown in FIG perform.

    Der Antrieb der Kupplungsvorrichtung 31 kann auf verschiedene Weisen erfolgen. In Figur 2 ist die Kupplungsvorrichtung 31 von einer Kurvenscheibe 38 des Hauptantriebs 28 antreibbar. Da somit kein separater Motor notwendig ist, stellt dies eine kostengünstige Lösung dar. Kostenmässig noch vorteilhafter ist der Antrieb durch die Bewegung der Nadelstösselantriebswelle, wie dies später unter Bezug auf Fig. 4a und 4b beschrieben wird. Es ist aber nach wie vor auch möglich, die Kupplungsvorrichtung 31 auch mittels eines Motors anzutreiben.The coupling device 31 can be driven in various ways. In Figure 2 the coupling device 31 can be driven by a cam plate 38 of the main drive 28. Since a separate motor is therefore not necessary, this is an inexpensive solution. The drive through the movement of the is even more advantageous in terms of cost Needle lifter drive shaft as will be described later with reference to Figures 4a and 4b. However, it is also still possible to use the coupling device 31 by means of a Motors to drive.

    Das am Ausgang der Kupplungsvorrichtung 31 auftretenden unterstützende Drehmoment für die Fadenwalze 13 wird über die Kegelräder 39,40 auf die Fadenwalze 13 übertragen. Wie bereits unter Bezugnahme auf Figur 1 beschrieben wurde, führt der Nadelfaden 11 von der Fadenspule 12 über die Fadenwalze 13, um durch Fadenzug die Fadenwalze 13 entgegen der Wirkung der Fadenwalzenbremse 24 und weiterer Reibungskräfte und der Trägheit der zu bewegenden Massen anzutreiben. Durch die Kupplungsvorrichtung 31 wird nun dieser Antrieb der Fadenwalze 13 durch ein Drehmoment unterstütztThe supporting torque occurring at the output of the coupling device 31 for the thread roller 13 is transmitted to the thread roller 13 via the bevel gears 39, 40. How already described with reference to Figure 1, the needle thread 11 leads from the Thread spool 12 over the thread roller 13 to counter the thread roller 13 by pulling the thread Effect of the thread roller brake 24 and other frictional forces and the inertia of the to drive moving masses. Through the coupling device 31 this is now Drive of the thread roller 13 supported by a torque

    Es ist dem Fachmann klar, dass die Fadenwalze 13 nicht wie in den Figuren 1 und 2 dargestellt ausgeführt werden muss. Vielmehr ist es auch möglich, für jeden Faden 11 in bekannter Weise eine ein- und auskuppelbare Fadenrolle vorzusehen. Wenn in dieser Schrift von Fadenwalze die Rede ist, ist dies auch im weiteren Sinne zu verstehen.It is clear to the person skilled in the art that the thread roller 13 is not as in FIGS. 1 and 2 shown must be executed. Rather, it is also possible for each thread 11 in known manner to provide a thread reel that can be engaged and disengaged. If in this scripture thread roll is to be understood in the broader sense.

    Wie die Fig. 4a und 4b zeigen, ist es auch möglich, die Bewegung der Nadelstösselantriebswelle 41 auszunützen, die von der Nadelkurvenscheibe (nicht eingezeichnet) in Bewegung versetzt wird. Diese Bewegung wird vom Hebel 36 über das Gestänge 42 auf den Schwenkhebel 43 übertragen. Dieser wird somit bei jedem Maschinenzyklus synchron mit den Nadelstösseln hin- und herbewegt.As FIGS. 4a and 4b show, it is also possible to move the Exploit needle tappet drive shaft 41 from the needle cam (not shown) is set in motion. This movement is from the lever 36 on the Transfer linkage 42 to the pivot lever 43. This will be with everyone Machine cycle back and forth synchronously with the needle tappets.

    In Fig. 5 ist ein Ausführungsbeispiel der Kupplungsvorrichtung 31 in Details dargestellt. Diese besteht im Wesentlichen aus der durch den Antrieb, z.B. einem Schwenkhebel 43 gemäss den Figuren 4a und 4b, in einer Richtung rotierbare Hohlwelle 45, einem Differenzialgetriebe 47, welches ein erstes Sonnenrad 49, einen Planetenradträger 50 mit einem Planetenrad 51 und ein zweites Sonnenrad 53 umfasst, einem Freilauf 55, einer vom zweiten Sonnenrad 53 über den Freilauf 55 antreibbaren Welle 57 und einer elektromagnetischen Bremse 59 mit einer axial verschiebbaren Bremsscheibe 61. Das Planetenrad 51 besteht aus zwei miteinander verbundenen Zahnrädern 79,80 und ist um eine Achse 82 drehbar. Diese ist fest mit dem scheibenförmigen Planetenradträger 50 verbunden. Der Planetenradträger 50 ist mittels Mitnehmerbolzen 63 mit der axial verschiebbaren Bremsscheibe 61 gekoppelt.5 shows an exemplary embodiment of the coupling device 31 in detail. This essentially consists of the drive, e.g. a pivot lever 43 4a and 4b, hollow shaft 45 rotatable in one direction, one Differential gear 47, which with a first sun gear 49, a planet carrier 50 a planet gear 51 and a second sun gear 53, a freewheel 55, one of the second sun gear 53 via the freewheel 55 drivable shaft 57 and one electromagnetic brake 59 with an axially displaceable brake disc 61. Das Planet gear 51 consists of two interconnected gears 79, 80 and is one Axis 82 rotatable. This is firmly connected to the disc-shaped planet carrier 50. The planet gear carrier 50 is axially displaceable by means of driver bolts 63 Brake disc 61 coupled.

    Der Freilauf 55 ist zwischen der Nabe 54 des zweiten Sonnenrads 53 und einer mit der Welle 57 fest verbundenen Büchse 56 angeordnet und ermöglicht ein Drehen der Fadenwalze 13 bzw. der Welle 57 durch Fadenzug allein, wenn das unterstützende Drehmoment aufhört und somit das zweite Sonnenrad 53 stillsteht.The freewheel 55 is between the hub 54 of the second sun gear 53 and one with the shaft 57 fixedly connected sleeve 56 and allows rotation of the thread roller 13th or the shaft 57 by thread tension alone when the supporting torque stops and thus the second sun gear 53 stands still.

    Ein weiterer Freilauf 58 ist zwischen der Nabe 54 des zweiten Sonnenrads 53 und der stationären Hülse 62 angeordnet, die mit dem Deckel 69 verbunden ist. Der Freilauf 58 verhindert ein Rückwärtsdrehen des zweiten Sonnenrads 53. Der Freilauf 58 ist jedoch entsperrbar ausgebildet, um bei Bedarf ein Rückwärtsdrehen der Fadenwalze 13 zu ermöglichen.Another freewheel 58 is between the hub 54 of the second sun gear 53 and arranged stationary sleeve 62 which is connected to the cover 69. The freewheel 58 prevents the second sun gear 53 from rotating backward. However, the freewheel 58 is designed to be unlockable in order to turn the thread roller 13 backward if necessary enable.

    Die Hohlwelle 45 könnte z.B. durch einen Motor angetrieben werden. Beim gezeigten Ausführungsbeispiel erfolgt der Antrieb jedoch durch einen Schwenkhebel 43 (vgl. Fig. 4), der pro Maschinenzyklus einmal hin- und herbewegt wird. Ein zwischen dem Schwenkhebel 43 und der Hohlwelle 45 angeordneter Freilauf 75 sorgt dafür, dass die Hohlwelle 45 nur in einer Drehrichtung rotiert wird.The hollow shaft 45 could e.g. driven by a motor. In the shown Embodiment, however, is driven by a pivot lever 43 (see FIG. 4), the is moved back and forth once per machine cycle. One between the swing lever 43 and the hollow shaft 45 arranged freewheel 75 ensures that the hollow shaft 45 only in one Direction of rotation is rotated.

    Ausser dem Freilauf 75 befinden sich die Organe der Kupplungsvorrichtung 31 in einem mit dem Deckel 69 verschlossenen Gehäuse 71, das einen Auslass 73 zum Wechseln des Oelbads aufweist. Fest mit dem Gehäuse 71 verbunden ist der stationäre Teil 60 der elektromagnetischen Bremse 59, welcher die Magnetspule enthält. Ueber dem stationären Teil 60 ist der bewegliche Teil der Bremse, die axial verschiebbare Bremsscheibe 61, angeordnet.In addition to the freewheel 75, the organs of the clutch device 31 are in one with the cover 69 closed housing 71, which has an outlet 73 for changing the oil bath having. Fixed to the housing 71 is the stationary part 60 of FIG electromagnetic brake 59, which contains the solenoid. Over the stationary part 60, the movable part of the brake, the axially displaceable brake disk 61, is arranged.

    Der Antriebsstrang vom Schwenkhebel 43 verläuft über den Freilauf 75 auf die Hohlwelle 45, das mit der Hohlwelle 45 mit Schrauben 77 verbundene erste Sonnenrad 49, das Planetenrad 51, welches aus den zwei miteinander verbundenen Zahnrädern 79,80 besteht, das zweite Sonnenrad 53, die Freilaufnabe 55, die Welle 57, die Kegelräder 39,40 und die Antriebswelle 81 zur Fadenwalze 13.The drive train from the pivot lever 43 runs via the freewheel 75 onto the hollow shaft 45, the first sun gear 49, the planet gear, connected to the hollow shaft 45 with screws 77 51, which consists of the two interconnected gears 79, 80, the second Sun gear 53, the freewheel hub 55, the shaft 57, the bevel gears 39, 40 and the drive shaft 81 to thread roller 13.

    An konstruktiven Details kann noch erwähnt werden, dass für die Hohlwelle 45 eine Dichtung 83 vorgesehen ist. Auch zwischen der Hohlwelle 45 und der Welle 57 ist eine Dichtung 85 angeordnet.In terms of design details, it can also be mentioned that a Seal 83 is provided. There is also one between the hollow shaft 45 and the shaft 57 Seal 85 arranged.

    Die Stickmaschine arbeitet wie folgt:The embroidery machine works as follows:

    Wie bereits vorher näher beschrieben wurde, liefert die Steuereinheit 25 ein aus den Daten für den jeweiligen Stich ermitteltes Steuersignal. Dieses wird an die elektromagnetische Bremse 59 angelegt, um eine dem Steuersignal entsprechende Bremswirkung zu erzeugen. Gleichzeitig mit der Bewegung der Nadeln gegen den Stickboden wird auch der Schwenkhebel 43verschwenkt. Dieser verursacht eine Rotation der Hohlwelle 45 und somit des ersten Sonnenrads 49. Solange der Fadenzug an der Fadenwalze 13 nicht ein bestimmtes Ausmass erreicht hat, steht aber die Fadenwalze 13 und somit auch das mit ihr über die Welle 57 und dem Freilauf 55 in Wirkverbindung stehende zweite Sonnenrad 53 still. Infolge der Drehung des ersten Sonnenrads 49 dreht das Planetenrad 51 und kreist um die Achse 87 der Vorrichtung, wobei der so in Drehung versetzte Planetenradträger 50 durch die Mitnehmerbolzen 63 die Bremsscheibe 61 mitnimmt. Solange das Steuersignal auf die Bremse 59 wirkt, schleift die Bremsscheibe 61 auf dem stationären Teil 60 der elektromagnetischen Bremse 59. Dadurch wird an das zweite Sonnenrad 53 ein Drehmoment angelegt Sobald der Fadenzug ein bestimmtes Ausmass erreicht, bewirkt er zusammen mit dem genannten Drehmoment ein Drehen der Fadenwalze 13. Das unterstützende Drehmoment vermindert die im Nadelfaden auftretenden Spannungen, die zum Reissen führen könnten. Bei der erfindungsgemässen Stickmaschine ist das unterstützende Drehmoment bei grossen Stickweiten höher als bei kleinen Stickweiten, wie dies bereits vorher unter Bezugnahme auf die Figuren 2 und 3 beschrieben wurde. Dadurch kann die Spannung im Nadelfaden bei grossen und kleinen Stichweiten praktisch gleich gehalten werden. Damit wird die Gefahr von Fadenbrüchen noch weiter reduziert als es mit den bekannten Vorrichtungen zur Lieferung eines unterstützenden Drehmoments möglich war.As has already been described in more detail above, the control unit 25 delivers one of the data for control signal determined for each stitch. This is applied to the electromagnetic brake 59 applied to generate a braking effect corresponding to the control signal. Simultaneously with the movement of the needles against the embroidery floor Swivel lever 43 swiveled. This causes a rotation of the hollow shaft 45 and thus of the first sun gear 49. As long as the thread tension on the thread roller 13 is not a specific one Has reached extent, but the thread roller 13 and thus also with it over the shaft 57 and the freewheel 55, the second sun gear 53 is in operative connection. As a result of Rotation of the first sun gear 49 rotates the planet gear 51 and circles about the axis 87 of the Device, wherein the thus rotated planet carrier 50 through the Driving pin 63 takes the brake disk 61 with it. As long as the control signal on the brake 59 acts, grinds the brake disc 61 on the stationary part 60 of the electromagnetic Brake 59. As a result, a torque is applied to the second sun gear 53 as soon as the Thread tension reaches a certain extent, it causes together with the mentioned Torque a turning of the thread roller 13. The supporting torque is reduced the tensions occurring in the needle thread, which could lead to tearing. In the Embroidery machine according to the invention is the supporting torque for large ones Stitch widths higher than for small stitch widths, as already mentioned with reference to Figures 2 and 3 has been described. This can cause tension in the needle thread large and small stitch widths are kept practically the same. So that is the danger of thread breaks even further reduced than with the known devices for Supplying a supporting torque was possible.

    Es ist möglich, das unterstützende Drehmoment durch Abschalten der Bremse 59 der Kupplungsvorrichtung zu beenden bevor der Fadenzug nachlässt. Der Freilauf 55 ermöglicht dann eine weitere Drehung der Fadenwalze 13 durch Fadenzug allein entgegen der Bremswirkung der Fadenwalzenbremse 24 (Fig. 2). Diese wird dabei entsprechend der Stichart gesteuert, dass sie mehr oder weniger stark bremst.It is possible to reduce the assist torque by turning off the brake 59 End the coupling device before the thread tension subsides. The freewheel 55 enables then a further rotation of the thread roller 13 by thread tension alone against the Braking effect of the thread roller brake 24 (Fig. 2). This is according to the Stitch type controlled that it brakes more or less strong.

    Die Erfindung ist nicht auf die gezeigten Ausführungsformen beschränkt. So könnte z.B. die Bremse 59 als mechanisch betätigbare Bremse ausgeführt werden, welche von einem Stellorgan, z.B. einem Elektromotor, unterschiedlich stark betätigbar ist. Auch wäre es möglich, aus der Gatterbewegung auf mechanischem Weg eine Bewegung zur Steuerung einer Bremse 59 abzuleiten. So könnte z.B. mit einer Mechanik wie in DE 410516 oder DE 692218 beschrieben, statt die Fadenwalze, die Bremse 59 gesteuert werden.The invention is not restricted to the embodiments shown. For example, the Brake 59 are designed as a mechanically actuable brake, which by a Actuator, e.g. an electric motor that can be actuated to different degrees. It would also be possible to move from the gate movement mechanically to the control derive a brake 59. For example, with a mechanism as in DE 410516 or DE 692218 describes, instead of the thread roller, the brake 59 are controlled.

    Zusammenfassend kann folgendes festgehalten werden:In summary, the following can be stated:

    Die Kupplungsvorrichtung 31 dient der Erzeugung eines unterstützenden Drehmoments für die Fadenwalze 13, wenn diese beim Sticken durch Zug der um die Fadenwalze 13 geschlungenen Nadelfäden in Drehung versetzt wird. Als Antrieb dient die Nadelstösselantriebswelle 41, welche mittels des Hebels 36 und des Gestänges 42 den Schwenkhebel 43 hin- und herbewegen kann. Dieser wird somit bei jedem Maschinenzyklus synchron mit den Nadelstösseln hin- und herbewegt. Ein Leerlauf sorgt dafür, dass die Kupplung 31 ein unterstützendes Drehmoment nur in einer Richtung über das Getriebe 39,40 an die Fadenwalze 13 anlegen kann. Da im Maschinenzyklus unabhängig von der Stichweite für jeden Stich immer ein gleichlanger Zyklusabschnitt zur Verfügung steht, wird durch die um die Fadenwalze 13 geschlungenen Fäden diese bei grossen Stichweiten mit grösserer Geschwindigkeit rotiert als bei kleinen Stichweiten. Die Kupplung 31 ist aber steuerbar, um die Grösse des unterstützenden Drehmoments aufgrund der in Stickprogrammen enthaltenen Daten für den jeweils auszuführenden Stich zu bemessen, so dass die Spannung in den Nadelfäden für alle Stichweiten praktisch gleich gehalten werden kann und die Gefahr von Fadenbrüchen weitgehend vermieden wird.The coupling device 31 is used to generate a supporting torque for the thread roller 13, if this by embroidery by pulling around the thread roller 13 looped needle threads is rotated. The serves as the drive Needle tappet drive shaft 41, which by means of the lever 36 and the linkage 42 Can pivot lever 43 back and forth. This is therefore the case with every machine cycle moved back and forth synchronously with the needle tappets. An idle ensures that the Clutch 31 has a supporting torque in one direction only via the transmission 39.40 can apply to the thread roller 13. Because in the machine cycle regardless of the stitch width The cycle section of the same length is always available for each stitch around the thread roller 13 threads wound with larger stitch widths with larger Speed rotates than with small stitch widths. The clutch 31 is controllable, however the size of the supporting torque due to that contained in embroidery programs Data for the stitch to be executed so that the tension in the Needle threads can be kept practically the same for all stitch widths and the risk of Thread breaks are largely avoided.

    Claims (19)

    1. Method of forming the stitch in a shuttle embroidery machine comprising a thread roller or thread wheels and in which the thread is pulled by a pulling force from the thread roller or the thread wheels with assistance of an angular momentum acting on the thread roller or the thread wheels, characterised in that the value of the assisting angular momentum is determined by the data of the embroidery program for the stitch to be executed.
    2. Method according to claim 1, characterised in that the length of the stitch is calculated from the data of the program, and that from this the value of the assisting angular momentum is determined.
    3. Method according to claim 2, characterised in that in determining the value of the assisting angular momentum the data concerning the kind of the stitch are also taken into consideration.
    4. Method according to one of the claims 1 to 3, characterised in that the amount of the assisting angular momentum which is determined from the data of the embroidery program is manually increasable or decreasable.
    5. Method according to one of the claims 1 to 4, characterised in that, after cessation of the application of the assisting angular momentum the movement of the thread roller is effected only by the pulling force on the threads.
    6. Method according to claim 5, characterised in that, after cessation of the application of the assisting angular momentum, the thread roller is more or less braked controlled by the program according to the kind of stitch.
    7. Embroidery machine with a control unit (25) controlling the machine according to the inserted program, embroidery tools capable of being actuated by a drive unit (28), a thread roller (13) over which the thread (119 runs from the spool (12) to the needle (16) and which is rotatable by the pull of threads, a thread roller brake (24) and a coupling device (31) capable of being driven by the drive unit or a motor to apply an assisting angular momentum to the thread roller rotatable by the pull of threads, characterised in that the control unit comprises means (25) which from the data of the embroidery program calculates the length of each stitch and, with help of a predetermined curve, generates a control signal or a control movement, and in that the coupling device is designed to generate the necessary assisting angular momentum for the length of each stitch.
    8. Embroidery machine according to claim 7, characterised in that the control unit (25) further comprises means which from data of the embroidery program concerning the kind of stitch generate a control signal for the thread roller brake (24) .
    9. Embroidery machine according to claim 8, characterised in that between the coupling device (31) and the thread roller (13) a free wheel (55) is located.
    10. Embroidery machine according to claim 8, characterised in that the coupling device (31) operates also as thread roller brake.
    11. Embroidery machine according to claim 8, characterised in that the coupling device (31) is braking in addition to the thread roller brake (24).
    12. Embroidery machine according to one of the claims 7 to 11, characterised in that the coupling device is in the form of a differential gear (47) comprising a first and a second sun gear (49,53) and a planet gear (51), said planet gear being located on a planet gear carrier (50), in that the drive chain from the drive unit to the thread roller (13) extends over the first sun wheel (49), the planet wheel (51) to the second sun wheel (53), in that the planet wheel carrier (50) is coupled with a brake disk (61) rotatable around an axis, and in that a brake controlled by the control unit is provided to excert a braking momentum on the braking disk (61).
    13. Embroidery machine according to claim 12, characterised in that the brake (59), e.g. an electromagnetic brake, is located coaxially to the sun wheels (49,53) and comprises a stationary part and a rotatable part, said rotatable part being coupled to the rotatable disk.
    14. Embroidery machine according to one of the claims 7 to 13, characterised in that the coupling device comprises a housing (71) in which at least the brake (59) is located in an oil bath.
    15. Embroidery machine according to one of the claims 7 to 13, characterised in that the coupling device (31) is intermittently operatable by the main drive, e.g. by a cam (38).
    16. Embroidery machine according to claim 15, characterised in that the coupling device is intermittently operatable by the cam for the needle motion.
    17. Embroidery machine according to claim 16, characterised in that the coupling device is coupled with a lever system (42,43) and a free-wheel (75) to the needle actuation shaft (41) which is actuatable by the cam for the needle motion.
    18. Embroidery machine according to claim 18, characterised in that the needle actuation shaft is linked by a crank lever (42) to a swivel arm (43) which is coupled by the free-wheel (75) to the first sun gear (49).
    19. Embroidery machine according to one of the claims 12 to 18, characterised in that between the second sun gear (53) and a housing part (60) a free-wheel (58) is provided.
    EP01811102A 2000-11-21 2001-11-16 Stitch forming process for an embroidery machine and embroidery machine for performing said process Expired - Lifetime EP1209273B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    CH22632000 2000-11-21
    CH22632000 2000-11-21

    Publications (3)

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    EP1209273A2 EP1209273A2 (en) 2002-05-29
    EP1209273A3 EP1209273A3 (en) 2003-01-02
    EP1209273B1 true EP1209273B1 (en) 2004-01-21

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP01811102A Expired - Lifetime EP1209273B1 (en) 2000-11-21 2001-11-16 Stitch forming process for an embroidery machine and embroidery machine for performing said process

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    EP (1) EP1209273B1 (en)
    AT (1) ATE258244T1 (en)
    DE (1) DE50101351D1 (en)
    TR (1) TR200400548T4 (en)

    Families Citing this family (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE50211447D1 (en) * 2001-09-19 2008-02-14 Laesser Franz Ag Embroidery machine, in particular Schifflitickmaschine

    Family Cites Families (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB177317A (en) * 1921-01-26 1922-03-30 Lionel Stephen Disney A new or improved thread control and thread feeding mechanism for embroidery and like machines
    CH115089A (en) * 1925-04-22 1926-06-01 Alfred Hertenstein Device on shuttle embroidery machines to reduce the thread tension required to switch the thread roller.
    AT370144B (en) * 1979-02-20 1983-03-10 August Heinzle DEVICE FOR FEEDING AND TOWING THE THREAD ON TEXTILE MACHINES
    DE4403365A1 (en) * 1994-02-04 1995-08-10 Saurer Sticksysteme Ag Method and device for embroidery on a shuttle embroidery machine
    ATE182376T1 (en) * 1996-03-15 1999-08-15 Laesser Franz Ag METHOD FOR STITCH FORMATION IN A SHIP EMBROIDERY MACHINE AND DEVICE FOR IMPLEMENTING THE METHOD
    JPH11107156A (en) * 1997-10-03 1999-04-20 Hiraoka Kogyo Kk Embroidery lace machine

    Also Published As

    Publication number Publication date
    DE50101351D1 (en) 2004-02-26
    EP1209273A2 (en) 2002-05-29
    EP1209273A3 (en) 2003-01-02
    TR200400548T4 (en) 2004-06-21
    ATE258244T1 (en) 2004-02-15

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