EP1209273A2 - Procédé de formation du point dans une machine à broder et machine à broder pour la mise en oeuvre dudit procédé - Google Patents

Procédé de formation du point dans une machine à broder et machine à broder pour la mise en oeuvre dudit procédé Download PDF

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Publication number
EP1209273A2
EP1209273A2 EP01811102A EP01811102A EP1209273A2 EP 1209273 A2 EP1209273 A2 EP 1209273A2 EP 01811102 A EP01811102 A EP 01811102A EP 01811102 A EP01811102 A EP 01811102A EP 1209273 A2 EP1209273 A2 EP 1209273A2
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EP
European Patent Office
Prior art keywords
thread
stitch
embroidery
thread roller
brake
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01811102A
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German (de)
English (en)
Other versions
EP1209273A3 (fr
EP1209273B1 (fr
Inventor
Franz Lässer
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.)
Franz Laesser AG
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Franz Laesser AG
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Filing date
Publication date
Application filed by Franz Laesser AG filed Critical Franz Laesser AG
Publication of EP1209273A2 publication Critical patent/EP1209273A2/fr
Publication of EP1209273A3 publication Critical patent/EP1209273A3/fr
Application granted granted Critical
Publication of EP1209273B1 publication Critical patent/EP1209273B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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.
  • 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 controlled to move 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 on Amount of thread to be embroidered is rotated. However, this does not seem to have proven itself 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 tight.
  • 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 delivered and that the remaining amount is withdrawn 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 required 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 that 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. But this supportive torque is not from a spring, but supplied 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 to further move 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 large stitch widths is stronger than with small stitch widths.
  • the thread roller is therefore more or more 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 embroidered Fabric, or an adjustment to the number of embroidering 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. At this The thread roller can continue to move according to the thread roller brake Stitch type are more or less slowed down.
  • stitch types e.g. the lockstitch, where the shuttle thread is pulled onto the front of the embroidery becomes relative heavily braked.
  • 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 program determines the stitch width of the respective stitch and uses 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 control 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 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 Brernse, is expediently arranged coaxially with 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 Brernse, e.g. electromagnetic brake, is 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 no need for a separate curve.
  • the needle tappet can be 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 be referred to the work cited by Schoener. To sum up 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 the 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 tests. These values result in a curve that initially runs linearly with the stitch width and then with increasing stitch width flattens.
  • 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 makes sense 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.
  • 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.
  • the 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.
  • the needle thread 11 leads from the Thread bobbin 11 over the thread roller 13 in order to pull the thread roller 13 against the thread Effect of the thread roller brake 24 and other frictional forces and the inertia of the to drive moving masses.
  • this is now Drive of the thread roller 13 supported by a torque.
  • 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.
  • 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 has 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 disk-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 pulling the thread 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 the 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 to reverse the thread roller 13 if necessary enable.
  • the hollow shaft 45 could e.g. powered 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 swivel lever 43 runs via the freewheel 75 onto the hollow shaft 45, the first sun gear 49 connected to the hollow shaft 45 with screws 77, the planet gear 51, which consists of the two connected 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 base 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 is the thread roller 13 and thus also with it on 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, 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 serves to generate a supporting torque for the thread roller 13, when 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 the case with every machine cycle moved back and forth synchronously with the needle tappets. An idle ensures that the Coupling 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)
EP01811102A 2000-11-21 2001-11-16 Procédé de formation du point dans une machine à broder et machine à broder pour la mise en oeuvre dudit procédé Expired - Lifetime EP1209273B1 (fr)

Applications Claiming Priority (2)

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

Publications (3)

Publication Number Publication Date
EP1209273A2 true EP1209273A2 (fr) 2002-05-29
EP1209273A3 EP1209273A3 (fr) 2003-01-02
EP1209273B1 EP1209273B1 (fr) 2004-01-21

Family

ID=4568278

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01811102A Expired - Lifetime EP1209273B1 (fr) 2000-11-21 2001-11-16 Procédé de formation du point dans une machine à broder et machine à broder pour la mise en oeuvre dudit procédé

Country Status (4)

Country Link
EP (1) EP1209273B1 (fr)
AT (1) ATE258244T1 (fr)
DE (1) DE50101351D1 (fr)
TR (1) TR200400548T4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1295977A3 (fr) * 2001-09-19 2005-01-26 Franz Lässer AG Machine à broder, en particulier du type Schiffli

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 (de) * 1925-04-22 1926-06-01 Alfred Hertenstein Vorrichtung an Schiffchenstickmaschinen zur Verminderung des zum Schalten der Fadenwalze nötigen Fadenzuges.
AT370144B (de) * 1979-02-20 1983-03-10 August Heinzle Einrichtung zur zufuehrung und zum nachziehen des fadens an textilmaschinen
DE4403365A1 (de) * 1994-02-04 1995-08-10 Saurer Sticksysteme Ag Verfahren und Vorrichtung zum Sticken auf einer Schiffchen-Stickmaschine
DE59700265D1 (de) * 1996-03-15 1999-08-26 Laesser Franz Ag Verfahren zur Stichbildung bei einer Schifflistickmaschine und Vorrichtung zur Durchführung des Verfahrens
JPH11107156A (ja) * 1997-10-03 1999-04-20 Hiraoka Kogyo Kk エンブロイダリーレース機

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1295977A3 (fr) * 2001-09-19 2005-01-26 Franz Lässer AG Machine à broder, en particulier du type Schiffli

Also Published As

Publication number Publication date
TR200400548T4 (tr) 2004-06-21
ATE258244T1 (de) 2004-02-15
EP1209273A3 (fr) 2003-01-02
DE50101351D1 (de) 2004-02-26
EP1209273B1 (fr) 2004-01-21

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