EP0542760B1 - Vorrichtung zum überwachen des greiferfaden-vorrats einer doppelsteppstich-nähmaschine - Google Patents

Vorrichtung zum überwachen des greiferfaden-vorrats einer doppelsteppstich-nähmaschine Download PDF

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Publication number
EP0542760B1
EP0542760B1 EP91912435A EP91912435A EP0542760B1 EP 0542760 B1 EP0542760 B1 EP 0542760B1 EP 91912435 A EP91912435 A EP 91912435A EP 91912435 A EP91912435 A EP 91912435A EP 0542760 B1 EP0542760 B1 EP 0542760B1
Authority
EP
European Patent Office
Prior art keywords
bobbin
sensor
thread
counter
looper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91912435A
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German (de)
English (en)
French (fr)
Other versions
EP0542760A1 (de
Inventor
Wolfgang Bruder
Horst Bohl
Reinhard BÄCKMANN
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.)
Duerkopp Adler AG
Original Assignee
Duerkopp Adler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19904024989 external-priority patent/DE4024989A1/de
Priority claimed from DE19914118158 external-priority patent/DE4118158A1/de
Application filed by Duerkopp Adler AG filed Critical Duerkopp Adler AG
Publication of EP0542760A1 publication Critical patent/EP0542760A1/de
Application granted granted Critical
Publication of EP0542760B1 publication Critical patent/EP0542760B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B59/00—Applications of bobbin-winding or -changing devices; Indicating or control devices associated therewith
    • D05B59/02—Devices for determining or indicating the length of thread still on the bobbin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H67/00—Replacing or removing cores, receptacles, or completed packages at paying-out, winding, or depositing stations
    • B65H67/06—Supplying cores, receptacles, or packages to, or transporting from, winding or depositing stations
    • B65H67/063—Marking or identifying devices for packages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/18—Constructional details
    • B65H75/182—Identification means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a device for monitoring the looper thread supply according to the preamble of claims 1 and 10.
  • a thread monitoring device which has the features of claim 1, is known from German laid-open specification DE-OS 36 25 630 A1.
  • the known thread monitoring device essentially consists of a sensor unit, a data processing unit and a signal device.
  • the sensor unit has a light source, for example a light transmitter, and a light receiver, for example a photodetector.
  • a light beam emitted by the light source is directed onto a bobbin provided for storing the hook thread, which is embedded in a bobbin case, also referred to as the upper part of the bobbin case, of a rotating lockstitch hook.
  • Said light beam penetrates an opening provided in the bobbin case and thus strikes an outside of a front flange, the outside being provided with black, light-absorbing and white, light-reflecting markings.
  • the above-mentioned bobbin briefly executes a rotary movement within a period in which the amount of thread required for the formation of a lockstitch is withdrawn from the looper thread supply located on the bobbin.
  • the sensor unit scans the alternating black and white markings, whereby electrical impulses are generated. These pulses are fed to a data processing unit and a signaling device, as a result of which the looper thread supply located on the bobbin is monitored.
  • This monitoring is based on the evaluation of the constantly changing reflection conditions, which allow appropriate conclusions to be drawn about the rotation and the current hook thread supply of the bobbin.
  • the signaling device emits a visual and / or acoustic warning signal.
  • the disadvantage of the known monitoring device is to be seen in the fact that the aforementioned monitoring only relates to the states “bobbin full; bobbin empty; thread break", while it is not possible to make a statement about any state with regard to the thread supply present in each case.
  • the invention is therefore based on the object to further develop a generic device for monitoring the looper thread supply, and to show a method for monitoring the looper thread supply so that information about the current thread supply of the ready-to-sew bobbin thread bobbin at any time and at any one Filling quantity are available.
  • the current thread supply of a hook thread bobbin can be called up at any time with regard to the filling quantity and possibly the nature of the wound sewing thread - starting from a full bobbin to an empty bobbin - because every change the filling quantity is written into a memory called an information carrier.
  • a read / write station is provided which is arranged separately from the sewing machine and which reads out or writes in the thread supply Spool-defining data allowed in spatial separation from the sewing machine.
  • the method according to the invention advantageously ensures that the seamstress is continuously informed about the filling level F and the remaining thread length L R still on the bobbin by visual display, and that when a predeterminable tolerance threshold of the almost empty bobbin is reached, an acoustic and / or visual signal indicates that the bobbin thread bobbin is empty immediately.
  • a conventional sewing machine 1 which consists essentially of an arm 2 and a base plate 3, the latter two being firmly connected to one another in a known manner.
  • An arm head 4 is provided on the front of the arm 2, in which, as is known, an up and down movable needle bar 5 is mounted.
  • the latter is driven by an arm shaft 6 mounted several times in the arm 2, the right end of which protrudes from the arm 2 carries a handwheel 6a.
  • the arm shaft 6 is driven by a sewing drive motor 7 via a traction means, which is only indicated symbolically in FIGS. 1 and 6, for example a V-belt.
  • a horizontally mounted gripper shaft 8 is provided below the base plate 3 and is driven in a known manner from the arm shaft 6 via a toothed belt (not shown here). It goes without saying that the device according to the invention also extends to a gripper with a vertically mounted gripper shaft, this embodiment not being shown here.
  • a double-circulating lockstitch gripper 9 is fastened, which is known to consist of a non-rotatable bobbin housing part 10, a rotatably mounted gripper body 11 on the circumference of the latter, a bobbin housing upper part 12 (which is sometimes also referred to as a bobbin case) is) and a coil 13 embedded in the latter.
  • the latter after it has been inserted together with the upper part of the bobbin case 12 into the lower part 10 of the bobbin case, is rotatably mounted on a protruding sleeve 14.
  • the coil housing lower part 10 carries the quill 14, which is thus part of the coil housing lower part 10.
  • a nose 15 provided on the upper part 12 of the bobbin case engages in a recess 16 in the lower part 10 of the bobbin case 10 when inserting the upper part 12 of the bobbin case.
  • the position of the coil housing upper part 12 in the coil housing lower part 10 is secured by a pivotable and displaceable flap 17 which, as is known, engages in a groove 18 provided at the front of the sleeve 14.
  • the coil 13 has a front flange 19 and a rear flange 20, both of which are connected to one another by a hub 21 according to FIG. 2.
  • an information carrier 22 is provided, which is made in a known manner either from sheet-like material, as a magnetic track (see FIGS. 3 and 4) or as a magnetic strip (see FIG. 5).
  • the latter is made of thicker, sheet-like material, which is also used for the production of magnetic cards.
  • the information carriers 22 just discussed, made of film-like or sheet-like material, are firmly connected to the outside of the flange 19 by using a suitable adhesive, preferably in such a way that they do not protrude beyond the outside of the flange 19. From Fig.
  • the information carrier 22 can be embodied by a transmitting and receiving device which is constructed in a hybrid circuit.
  • This transmitting and receiving device consists of two relatively flat processors which are attached to the flange 19 or 20 of the coil 13 by a cast resin coating. In the vicinity of these processors, a very flat coil is provided on the opposite side of the flange 19 or 20, which is also connected to the relevant flange 19, 20 by a cast resin coating. An energy transfer then takes place through a stationary magnet arranged in the vicinity of this coil. The processors are activated by the latter.
  • the sensor for scanning the information carrier 22 can either - as shown in FIG. 2 - in front of the gripper 9 or - here not shown - be arranged behind the gripper.
  • a further mark 25 can also be attached to the outside of the flange 19, which is in contrast to its surroundings, for example as a dark spot in the form of a glued on, expediently somewhat recessed color field.
  • a further mark 25a is applied to the end face of the handwheel 6a.
  • an opening 26 according to FIG. 2 is provided in the front side of the coil housing upper part 12, which enables the unimpeded scanning of the mark 25 and / or the information carrier 22. The scanning just mentioned is made possible by a sensor device which, in the exemplary embodiment shown in FIGS.
  • a first read / write head 27 and a second read / write head 27 ' essentially consists of a first read / write head 27 and a second read / write head 27 '.
  • the latter is attached to the arm 2, while the read / write head 27 is attached to a swivel arm 29 which is pivotably mounted about a pin 30 mounted in the base plate 3.
  • a piston rod 32 of a frame-fixed mover 33 engages via a known ball-and-socket joint 31, which was only shown symbolically in FIG. 2.
  • the latter is embodied, for example, by a single-acting compressed air cylinder, which is pressurized with compressed air, which is taken from an external compressed air source 35, at times via a commercially available three / two-way solenoid valve 34.
  • a tension spring 37 is also articulated on the swivel arm 29 and is connected to the base plate 3 in a frame-fixed manner on one side. Through the extendable piston rod 32, the swivel arm 29 is pivoted until it moves according to FIGS. 1 and 2 against an adjustable stop 38 which is mounted on the base plate 3.
  • the adjustable stop 38 thus allows a minimal gap between the Read / write head 27 and an end face 42 on the gripper 9, which ensures unimpeded passage of the needle thread loop looping around the gripper 9.
  • a winding device 39 is provided on the arm 2, with which, as is known, an empty bobbin 13 'can be wound with the sewing thread.
  • the winding device 39 is driven, for example, in a known manner by the arm shaft 6 via a bevel friction gear.
  • the winding (winding with sewing thread) of an empty bobbin 13 'can also be carried out in a separate station which is independent of the sewing machine 1.
  • a first counter / write unit 52 and a second counter / write unit 53 are provided, among other things.
  • the two counter / write units 52, 53 it is also possible for the two counter / write units 52, 53 to appear spatially separate from one another and not — as shown in FIGS.
  • the counter / write unit 52 is connected via lines 50, 51 to the read / write head 27 '.
  • the counter / write unit 53 is connected to the read / write head 27 via the lines 54, 55.
  • FIG. 6 shows a further embodiment of the invention, which is characterized in that one of those for reading out the data contained in the information carrier 22 of the bobbin 13 and for writing in the current data defining the current thread supply of the bobbin 13 in the information carrier 22 Sewing machine 1 separate read / write station 40 is provided.
  • a write head 28 is fastened to the arm 2 in accordance with the embodiment shown in FIG. 6 and cooperates with a further read head 49 fixed to the frame. The latter detects the mark 25a, which is provided according to FIG. 6 on the handwheel 6a connected to the arm shaft 6.
  • the read / write station 40 also has a not shown here for the coil 13 a stationary read / write head 27 'and a controller 41.
  • the latter contains a first counter / write unit 43 and a second counter / write unit 44.
  • the write head 28 and the read head 49 are connected to the first counter / write unit 43 via the lines 45, 46.
  • the read / write head 27 ' is connected to the second counter / write unit 44 according to FIG. 6 via the lines 47, 48.
  • the two counter / write units 43, 44 it is also possible for the two counter / write units 43, 44 to appear spatially separate from one another and not — as shown in FIG. 6 — to be accommodated in a common controller 41.
  • the embodiment described last and shown in FIG. 6 differs by the following:
  • the coil 13 ′ placed on the winding device 39 is written to via the write head 28 with regard to its information carrier 22 , wherein the further reading head 49 determines the number of revolutions of the coil 13 'by scanning the mark 25a rotating with the handwheel 6a.
  • the said number of revolutions of the bobbin 13 ' is thus a measure of the thread supply on the bobbin 13.
  • the pulses output by the write head 28 are delivered to the first counter / write unit 43 via the line 46.
  • the pulses emitted by the read head 49 are likewise emitted to the counter / write unit 43 via the further line 45 (cf. FIG. 6).
  • the information carrier 22 serves, on the one hand, to receive or deliver data about the current thread supply of the bobbin 13 and, on the other hand, to make every revolution of the bobbin 13 detectable, for which purpose the information carrier 22 4 and 5 is designed.
  • This goal can also be achieved with a differently designed coil 13, which according to FIG. 3 has another information carrier 22 has additional mark 25. The latter must then be scanned by a separate reading head, not shown in FIGS. 1 and 6 to 8.
  • FIG. 7 shows the bobbin 13 at another point with an arrow 57, which symbolizes the unwinding of the bobbin 13, that is to say the process during the sewing.
  • a winding process is initially carried out in order to apply a thread supply to the bobbin 13'.
  • the information carrier 22 passing by the read / write head 27' is detected, so that with each revolution of the coil 13 'a pulse is delivered to the counter / write unit 52 via the line 51.
  • the counter / write unit 52 contains a sum of pulses, which represents a measure of the current thread supply of the bobbin 13 '.
  • a transfer of the sum to the read / write head 27 ′ is carried out via the line 50, so that the said sum is stored in the information carrier 22.
  • the process explained so far takes place on the winding device 39 of the sewing machine 1 or at an independent station for winding the bobbin 13 '.
  • the sum stored in the information carrier 22 is read out via the read / write head 27 and sent to the counter / write unit 53 via the line 55.
  • the bobbin 13 is rotated by pulling off the hook thread, wherein again each time the information carrier 22 passes the read / write head 27, ie each revolution of the spool 13, a pulse is detected and is likewise output via line 55 to the counter / write unit 53.
  • the impulses which detect the revolutions of the bobbin 13 during the sewing process represent a measure of the thread consumption.
  • the counter / writing unit 53 In the counter / writing unit 53, the last-mentioned pulses are counted down from the sum which corresponded to the thread supply of the bobbin 13 before the sewing process just carried out and which - as mentioned above - was read into the counter / writing unit 53 at the beginning of the sewing process. As soon as the result from the sum recorded in the beginning in accordance with the thread supply of the bobbin 13 and the pulses in accordance with the thread consumption during a sewing operation takes the value zero or a defined residual value, the counter / write unit 53 emits a signal via an output line 58, which is known in the art Way is used via a signal device, not shown here, to display the thread consumption. At the same time, this signal serves to write the current value into the information carrier 22, which describes the current thread supply on this spool. For this purpose, the counter / write unit 53 transfers the current value via line 54 to the read / write head 27.
  • a change of the bobbin 13, 75 is essential. Before the change, the current thread supply of the bobbin 13, 75 to be replaced is written into the associated information carrier 22, 68 in the manner described above, i.e. the information carrier 22, 68 of the said coil 13, 75 provides information about the current filling quantity of this coil 13 or coil 75 at any time.
  • the sewing machine 1 shown in Fig. 1 is in the range of Spooling device 39 instead of the read / write head 27 'with a read head 60 and in the area of the gripper 9 instead of the read / write head 27 with a read head 61.
  • a counter / write unit 62 and a control part 63 are contained within the controller 36.
  • the controller 36 is connected to the read head 60 via a line 64 and to the read head 61 via a line 65.
  • the control part 63 is connected in terms of circuitry via a connecting line 66 and the counter / write unit 62 via a connecting line 67 to an information carrier 68, which is provided as an external, that is to say separate, component and can have, for example, a magnetizable strip or a volatile memory component.
  • the information carrier 68 contains individual storage locations, which are designated schematically in FIG. 8 with 69, 70 and 71. All storage locations of the information carrier 68 are each subdivided into an address field 72 and a data field 73, as is shown, for example, in FIG. 8 at the storage location 70. As can further be seen from this, the address field 72 bears the number 31 and the data field 73 the number 2604. According to the illustration in FIG. 8, the storage space 69 in its data field, which is not specified, contains the number 0 and the storage space 71 in its data field, which is not specified the number 733. Finally, the counter / write unit 62 is also equipped with an output line 74, which establishes a connection to a signal device, not shown, for example an indicator light.
  • a coil 75 is used, which basically corresponds to the coils previously used in its construction.
  • the coil 75 is provided on the outside of a flange 76 with a coding 77 which corresponds to an individual number of each individual coil. Because of this design, it is possible to identify each individual coil from a number of coils 75 in use.
  • the coding 77 is implemented with a wide line 78 and a plurality of narrow lines 79. Due to the formation of the lines 78 and 79, different pulse widths result, which the controller 36 compares with one another, so that the wide line is clearly recognized as the beginning of the coding 77.
  • the coding 77 is designed in accordance with the illustration in FIG. 9 in such a way that on the one hand an unambiguous counting of each revolution of the coil 75 by passing the coding 77 of one of the reading heads 60 or 61 and on the other hand a unique identification of each individual coil is possible.
  • the coding of the coil 75 takes place in that empty fields 80 on the circular ring surface 81 are correspondingly blackened with a felt-tip pen according to a coding algorithm. It is therefore easy to code or apply coding to the supplied neutral coils. However, it is also conceivable to obtain information about a spool in that, in addition to the coding, a mark is provided which, with a specially provided reading head, serves to count each revolution of the spool.
  • FIGS. 8 and 9 The mode of operation of the device according to the invention with regard to the solution shown in FIGS. 8 and 9 is described as follows: As in the previous description of the method of operation of the solution according to FIG. 7, a symbolic representation with the arrows 56, 57 is also selected in FIG. 8. Starting from an empty bobbin 75, a winding operation is first carried out on the winding device 39 (compare FIGS. 1 and 7) in order to apply a thread supply to the bobbin 75. As a result of the rotation of the spool 75, the coding 77 moves past the reading head 60 once each revolution of the spool 75.
  • the pulse sequence identifying the characteristic number of the coil 75 is delivered to the controller 36 via the line 64.
  • the control part 63 of the controller 36 selects a memory location of the information carrier 68 which is associated with the coding 77 and which can be the memory location 69, for example. According to the representation in FIG. 8, the memory location 69 is assigned the number 0 in its data field 73, which is not described in any more detail.
  • a pulse train identifying the spool 75 is delivered to the controller 36 via line 64 for each revolution of the spool 75 via the read head 60, the counter / write unit 62 recording each of these revolutions as a counting operation.
  • the winding process is finally ended in the usual way by mechanical means, so that the bobbin 75 has a filling quantity of 100 percent.
  • the counting state of the counter 62 reached at this point in time is transferred via line 67 to the data field of the previously selected storage location 69 and stored in the information carrier 68.
  • various bobbins 75 can be wound up, for example, with threads of different colors and with different fill quantities, so that corresponding data have been stored in the associated storage location 69 or 70 or 71.
  • the operator of the sewing machine 1 inserts one of these wound bobbins into the gripper 9 so that the actual sewing process can then begin.
  • a pulse sequence which characterizes the number of the coils 75 is delivered to the controller 36 via the line 65.
  • the storage location corresponding to the coil in question is selected again, which in FIG. 8 is the storage location 71.
  • the controller 36 receives information about the content of the value stored in the data field, which has the value 733 here.
  • a further pulse sequence is sent via line 65 to the counter / writing unit 62, which is thus able to perform a counting process again and thus add up a number corresponding to the thread consumption required for the sewing process.
  • the counter emits a signal via the output line 74.
  • this signal output also serves to initiate a stop operation via line 59 (see FIGS. 1 and 6) for the sewing machine 1 and to write a new information input into the updated data field. Since the thread supply of the bobbin 75 has now reached the value 0 in the example just explained, an entry is made with the value 0 in the addressed data field.
  • the last-mentioned sewing process can also take place in such a way that the bobbin 75 still has a certain amount of remaining thread due to a color change that becomes necessary, i.e. has a certain thread supply.
  • the counter / write unit 62 outputs a difference value corresponding to the remaining thread supply of the bobbin 75 to the associated data field via the connecting line 67, which difference value was formed from the originally available thread supply and the thread consumption of the bobbin 75.
  • the explosive gripper 9 shown in FIG. 10 of a lockstitch sewing machine 1 consists of the bobbin case upper part 12, the bobbin 13 and the bobbin case lower part 10.
  • On the outside of the front Flange 19 of the coil 13 is applied at least one mark 25 in the form of light-dark sectors known per se, which is detected by a sensor 85.
  • the opening 26 is provided in the upper part 12 of the coil housing, through which a light beam emitted by the sensor 85 - preferably an optical reflex coupler - and reflected by the flange 19 can pass.
  • the rotation of the bobbin 13 during winding as well as the partial rotation of the bobbin 13 during sewing generate pulses which represent the turns of the looper thread located on the bobbin 13 and thus also the degree of filling F of the bobbin 13.
  • These pulses are forwarded via a connecting line 86 to at least one counter 87, which in this case is designed as an up and down counter.
  • an opening or a plurality of openings, preferably having the same spacing, in the flange 19 is very expedient because this marking is very insensitive in the relatively rough sewing operation.
  • Said openings are preferably designed as holes in the flange 19. Since this training has been used for a long time - for example to reduce the mass of steel coils - an illustration has been omitted here. To increase the accuracy of the pulse generation, it is advisable to arrange a large number of openings in the flange 19 or a large number of light-dark sectors on the outside of the flange 19.
  • each coil at least on its flanges 19, 20, is provided on the outside with different colors - in the case of aluminum coils by the known anodizing process - generally 16 to 32 different ones Shades are sufficient.
  • a winding device known per se is shown in plan view in FIG. 12, wherein a winding wheel 89 driven by a motor 88 has a receiving pin 90.
  • the latter takes up the empty bobbin 13, which is wound in a known manner during winding with a sewing thread 92 drawn off from an external spool 91.
  • the latter is passed through a thread guide eyelet 93 and a non-positive disc tensioner 94, and then wound around a bobbin hub 95 in a known manner. It is expedient to first wind up a few turns by hand when the coil 13 is at a standstill.
  • the marks 25 provided on the outside of the flange 19 or the holes provided in the flange 19 are detected by a second sensor 96 and forwarded to the counter 87 via a line 97 (see FIG. 12), whereby - as mentioned above - it is very much It is expedient if a second counter 87 ′′ is assigned to the sensor 96.
  • the revolutions of the bobbin 13 that are carried out from the start of the winding up to the end of the bobbin winding process are thus monitored by the sensor 96, the pulses generated in this case being counted up by the counter 87, 87 ′ when the bobbin 13 is full, up to a maximum number of pulses Z max .
  • the exact determination of Z max naturally requires a perfect winding process, in which the winding layers lie correctly on top of each other and in which the last winding layer is as close as possible to the Seal the outer diameter of the coil flanges 19, 20 flush.
  • the pulse number Z is determined by counting down the counter 87, 87 '.
  • the latter represents the thread consumption of the bobbin 13 during sewing and is related to the diameter D R of the remaining thread winding 98.
  • the counters 87 and 87 ', 87'' are operatively connected to a computer unit 100 via a line 99, as a result of which the number of pulses Z max and Z ist are entered into the computer unit 100.
  • the latter also includes a keyboard 101 and a display 102.
  • the computer unit 100 After entering the most important geometry data of the coil 13, namely the outer diameter D and diameter d of the coil hub 95 using the keyboard 101 and after reading in the pulse numbers Z max and Z is , the computer unit 100 Algorithms described below, the current degree of filling F of the coil 13 is calculated and shown on the display 102.
  • the computer unit 100 is operatively connected to a controller 104 of the sewing machine 1 via the lines 103.
  • Z max can be derived from the relationship for this case: which results in Z max results.
  • the maximum length L max of the perfectly filled thread winding wound on the bobbin 13 results from: If "N pulses" are generated with the turn applied, Z max must be divided by N. If one defines the remaining thread length on the bobbin 13 with L R , the resulting current filling degree F of the bobbin results wherein and is.
  • the degree of filling F is derived from a further relationship, which is based on the following consideration:
  • the thread length L max can be accommodated in a cylindrical, tubular thread package with the dimensions D, d and b, the thread package taking up a volume V max .
  • the remaining thread length L R can be accommodated in a further thread package with the dimensions D R , d and b, the latter taking up a volume V R.
  • the degree of filling F is also out of the relationship predictable.
  • the remaining thread length L R can also be shown, which is calculated by the computer unit 100 according to the formula on the assumption that 13 "N pulses" are generated when a turn is unwound from the coil.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP91912435A 1990-08-07 1991-07-13 Vorrichtung zum überwachen des greiferfaden-vorrats einer doppelsteppstich-nähmaschine Expired - Lifetime EP0542760B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4024989 1990-08-07
DE19904024989 DE4024989A1 (de) 1990-08-07 1990-08-07 Verfahren und einrichtung an einer doppelsteppstich-naehmaschine zur ueberwachung des spulenfadens
DE19914118158 DE4118158A1 (de) 1991-06-03 1991-06-03 Vorrichtung zum ueberwachen des greiferfaden-vorrats einer doppelsteppstich-naehmaschine
DE4118158 1991-06-03
PCT/EP1991/001320 WO1992002673A1 (de) 1990-08-07 1991-07-13 Vorrichtung zum überwachen des greiferfaden-vorrats einer doppelsteppstich-nähmaschine

Publications (2)

Publication Number Publication Date
EP0542760A1 EP0542760A1 (de) 1993-05-26
EP0542760B1 true EP0542760B1 (de) 1994-10-19

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EP91912435A Expired - Lifetime EP0542760B1 (de) 1990-08-07 1991-07-13 Vorrichtung zum überwachen des greiferfaden-vorrats einer doppelsteppstich-nähmaschine

Country Status (5)

Country Link
US (1) US5353726A (ja)
EP (1) EP0542760B1 (ja)
JP (1) JP3041046B2 (ja)
DE (1) DE59103298D1 (ja)
WO (1) WO1992002673A1 (ja)

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Publication number Priority date Publication date Assignee Title
DE4116788C1 (ja) * 1991-05-23 1992-06-25 G.M. Pfaff Ag, 6750 Kaiserslautern, De
DE4210477A1 (de) * 1992-03-31 1992-10-01 Baeckmann Reinhard Verfahren und einrichtung an einer doppelsteppstich-naehmaschine zur ueberwachung des spuleninhaltes
DE4310139A1 (en) * 1992-03-31 1993-09-02 Baeckmann Reinhard Sewing machine
JPH07204378A (ja) * 1994-01-17 1995-08-08 Takehiro Tanaka ミシンにおけるボビン糸の残量検出方法及び装置
DE19646707C2 (de) * 1996-11-12 1998-09-10 Ksl Keilmann Sondermaschinenba Verfahren und Anordnung zur Übermittlung garnspezifischer Daten bei Umspulvorgängen für die Herstellung von dokumentationspflichtigen Doppelsteppstichnähten
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EP0542760A1 (de) 1993-05-26
JP3041046B2 (ja) 2000-05-15
DE59103298D1 (de) 1994-11-24
US5353726A (en) 1994-10-11
WO1992002673A1 (de) 1992-02-20
JPH06500241A (ja) 1994-01-13

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