Title of Invention

THREAD DRIVE MACHANISM CONTROLLED IN A MANNER DEPENDING ON THE DETERMINED THREAD TENSION

Abstract

The invention relates to a device for a stitching or sewing machine, said device comprising a thread drive mechanism (10) with a roller (11) mounted to rotate about an axis, which may be driven by a drive unit in both directions about the axis thereof. On turning said roller in one direction, an upper thread (3) for thread feed or loop formation Is wound off a feed spool (4) and by rotating the roller (11) in the opposite direction, the upper thread is pulled back (thread withdrawal) and thus drawing the stitch or loop. During the stitching or sewing process a measuring device (8) measures the tension in the upper thread and the device controls the thread drive mechanism depending on the determined thread tension.

Full Text

The present invention relates to a device for a stitching or a sewing machine comprising a thread driving mechanism hiving a roller mounted for rotating about an axis, said roller driven by the drive unit in both directions about the axis thereof; and a feed spool for winding off an upper thread for thread feed or loop formation, by turning said roller in one direction, and pulling back the upper thread for thread withdrawal by rotating the roller in the opposite direction, thus drawing the stitch or loop; as well as a process using the device according to the invention. A device is known from EP-PS0014897, in the case of which a roller looped by the needle threads is equipped with a drive, which pre-sets the advance and pull back direction of the roller independently of the thread tension and in the case of which the thread guides are also omitted, because the thread length released and again withdrawn by these is likewise advanced and pulled back by the driven roller. The function of the mechanism indicated in this document is limited to simulating the stitching process in such a way as known from conventional shuttle sewing machines according to DE-PS 3416266. The process is further based on creating a thread tension in the needle thread during the stitching process. In particular, EP-PS 0014897 discloses that the completed stitch is tightened by reversing the roller after the stitch formation, whereby the needle thread is tensioned (page 4, column 6, Iines 25 to 28). This process again leads to stress in the needle threads, which limits the operating speed and results in the occurrence of thread breakages. In the case of the device described in EP- PS 0014897, there is no control regarding possible thread breakages in particular of the upper or lower thread . Rather, the thread feed and in particular the thread withdrawal are permanently pre-set by the control system. The thread tension is not checked during the stitching process in the case of this device. For example, if disturbances arise during the stitching process. then the force-actuatod thread withdrawal automatically leads to thread breakage. EP 0666351 discloses a process and a device for embroidering on a shuttle sewing machine, in the case of which a thread guide and a feed unit supply the length of thread necessary for the needle to penetrate the fabric, for loop formation for the shuttle to pass through the loop and the thread length to be applied or. the embroidery foundation for stit formation, whereby the needle thread is kept virtually stress-free curing the entire stitch formation and the stitch is only tightened due to the wind-off force of the shuttle thread. The process and device described in EP 0666351 cannot be transposed to a stitching or sewing machine, in the case of which the upper thread must be always pulled back or tightened by the thread withdrawal for the loop or stitch formation and thus is continually under stress. DE 3839733 describes a stitch-forming machine with a sensor to measure the tension contained in a thread, commising a control device via which the tension is evaluated during individual phases of the stitch formation. By means of this device, the tension in the needle thread can be easily determined/ whereby if there is too much tension the stitch formation process is interrupted and suitable counter measures can be taken. The object of the present invention is to further develop a stitching or sewing machine to the effect that the loop or stitch formation in the individual working phases of the stitching or sewing machine is optimized by optimum thread tension. Furthermore, it is proposed that a stitching or sewing machine is further developed to the effect that the thread feed and in particular thread withdrawal are optimized, so that in particular fewer thread breakages occur. This object is ingeniously achieved with a device according to the features of claim 1. Further advantageous embodiments are clear from the features of the dependent claims 2 to 28. Furthermore, a process is claimed using a device according to claims 1 to 28, which serves to execute an optimiz stitching or sewing process. Advantageously, the process according to claim 29 is further expanded by the features of claims 30 to 33, Advantageously, the device measures the tension in the upper thread during thread withdrawal by means of measuring device, whereby the measured tension is considered by the control system of the device, meaning that it is checked whether the stitch process is being properly executed. If a deviation in the thread tension is detected, the control system of the device or the stitching or sewing machine determines whether the thread tension is too much or too little for the particular stitching or sewing process. Depending on the evaluated thread tension signal, the thread drive' mechanism is controlled accordingly during thread withdrawal. Thus, advantageously, thread withdrawal can be terminated for example, if the level of the determined thread tension exceeds a calculated pre-set tension threshold value. This tension threshold value, for example, can be variable and advantageously depends on the thread to be stitched (type and strength), the foundation to be embroidered as well as on the kind of stitch. The stitching or sewing machine can also be stopped with the thread withdrawal, so that, for example, the operatives can manually rectify any problems arising during the stitching process. Likewise, the sewing or stitching machine can begin the next stitch formation immediately after the current stitching process has finished. If the thread threshold value is exceeded during this stitch or loop formation, the sewing or stitching machine can also be stopped by the control system. It is equally possible to increase the speed of the thread advance so that the thread tension is reduced. Likewis , it is possible to wind off less thread, if too much upper thread is present when the lower thread is fed through the loop formed by the upper thread, so that the thread tennson in the upper thread assumes higher values. The direct control of thread advance or thread withdrawal ensures that the speed of the thread advance and thread withdrawal and the speed of the needle are generally coordinated with one another, and that too much tension does not arise in the upper thread. Thus, for example, it is possible that after the loop has been formed, the upper thread is shortened by knot formation, so that less thread has to be pulled back in order to tighten the loop or the stitch with the necessary tension. In the event of such an occurrence with conventional stitching or sewing machines, a thread breakage would inevitably occur, unless these comprise a thread tension measuring device according to DE 3839733, whereby this occurrence would then inevitably lead to stoppage of the machine. Since the thread tension-measuring device according to DE 3839733 would only emit a signal that the maximum permissible upper thread tension had been exceeded, so that the stitching machine would be inevitably stopped. The device according to the invention however, through direct control of thread withdrawal, would pull back less thread, so that the permissible tension in the upper thread is not exceeded, thereby preventing thread breakage and stoppage of the stitching or sewing machine. At the same time, the optimum thread upper tension can be obtained during the loop or stitch formation by means of the device. Advantageously/ the optimum thread upper tension can be controlled by means of an appropriate regulation algorithm. Advantageously, the device-also reduces the speed/ at which the upper thread is withdrawn, if the thread upper tension approaches a calculable or pre-definable tension threshold value. Thereby good regulation characteristics are obtained and thread breakage is reliably prevented. Advantageously, it is possible with the device according to the invention to detect upper thread and also lower thread breakages. This is due to the fact that during the entire stitching or sewing process, the tension of the upper thread just stitched is monitored by the device. As a result, it is possible to recognize whether the tension in the upper thread exceeds or falls below certain threshold values at certain times during the stitch or loop formation. Thus, on the one hand, it is possible that, during the passage of the lower thread through the thread loop produced underneath the stitching foundation by means of the shuttle, the thread tension does not exceed an inadmissible level. If the thread tension exceeds the tension threshold value for example by means of the thread drive mechanism further thread can be made available, so that the loop is sufficiently large for the shuttle with the lower thread spool located in it to safely pass through the loop. Furthermore, in this case the maximum permissible thread length can be considered. If, for example, further thread is wound off by the thread drive mechanism to reduce the thread upper tension, it must be ensured that this does not continue for an infinitely long period. Rather, it must be ensured that the stitching process is interrupted after a certain length of additional thread, since a critical error has arisen. On the other hand, lower thread breakages can be reliably detected if a certain tension threshold value is not reached when a first tension peak occurs. Thus, the upper thread is slightly tensioned by pulling the lower thread through the loop formed by the upper thread, so that the tension in the upper thread increases while being pulled through in order thereafter to drop again. If the tension threshold value has not been exceeded, then this is rated as thread breakage. Likewise, however, this can also mean that too much thread has been advanced for the loop formation. The latter case can be determined, for example, by thread withdrawal within the time frame, in which the shuttle passes through the loop of the upper thread. If the tension does not increase within this time frame, then it can be concluded that the lower thread has broken. Advantageously, the control electronics of the device i.e. the sewing or stitching machine, in the event of any of the aforementioned scenarios in each case checks the steps taken to resduce the tension in the upper thread for their plausibility. Advantageously, the thread drive mechanism of the device according to the invention serves to advance or transport several upper threads of a multi-head sewing or stitching machine. For this purpose, the roller turned by the drive can be moved parallel to the surface of the stitching foundation and pressed against rollers, around which the individual upper threads are fed separately in each case, so that the individual rollers looped by the upper threads can be rotated alternatively after one another by means of the roller. By changing the rotating direction of the driven roller either thread is advanced or, however, the upper thread is withdrawn. A further advantageous configuration of the device according to the invention arises if a thread reversing device is used to measure the tension of the upper thread just stitched or sewn. For this purposs, at least one sensor records the deformation or excursion of the thread reversing device from its original position. From the amount of deformation or excursion control electronics can easily determine the tension in the upper threaa currently being sewn or stitched. Since all upper threads of the multi-threa stitching or sewing machine are reversed by the thread reversing mechanism, advantageously only a few or only one sensor is needed to determine the respective thread tensions of the individual upper threads being stitched alternatively after one another. Advantageously, the thread reversing mechanism is a U-shaped part, which is fixed to the stitching head at its two ends in each case via intermediate parts. The intermediate parts can be configured at an angle, so that the reversing mechanism is somewhat offset from the front plate of the stitching head and thus leverage forces can be used to bend the angular brackets or the one angular bracket. Advantageously, this is formed with a thin wall in one area for easier bending of an angular bracket. Advantageously, in this thin-walled area the deformation can be recorded by means of wire strain gauges. Likewise, it is conceivable that pressure sensors as, for example, piezo elements are used, which pick up the thrust forces arising at the junction or contact points. Various exemplary embodiments of the device according to the invention are described in detail below on the basis of drawings, wherein: Fig. 1 shows a perspective view of a first possible embodiment of the device according to the invention; Fig. 2 shows a second possible configuration of the device according to the invention; Fig. 3 shows a detailed view of the thread drive mechanism; Fig. 4, 5 and 6 show tension gradients in the upper thread during various stitching scenarios; Fig. 7 shows a perspective view of a stitching head with a thread reversing mechanism to measure the tension in an upper thread; Fig. 8 shows an exploded view of the embodiment according to Fig. 7; Fig. 9 shows a sectional view through a thread reversing mechanism according to the invention to measure the tension in an upper thread. Fig. 1 illustrates a sectional view of a stitching machine. The stitching head 1 comprises a needle drive mechanism for several stitching needles 2, which can selectively stitch an upper thread 3 with their tips 2a. Fig. 1 only shows the component parts relevant to the function of the device. The upper th.ead 3 is guided via reversing devices 5a, 5b, 5c, 5d and 5e to the stitching needle 2. The stitching thread 3 is wound off from the feed spool 4 over the reversing mechanism 5a, 5b and 5c and guided through the respective eyes 5a, 5b and 5c to the respective drive rollers 6. The stitching thread in this case loops once or several times the drive roller 6 assigned to it and then leaves the roller 6 in the direction of the thread guide mechanism 5d, through the eye of which it is further taken in the direction of the thread tension sensor 8, in order then to pass through the thread guide 5e or its eye 5e in the direction of the needle tip. Thread feed or thread withdrawal is ensured by means of drive 10 and drive roller 11. The drive 10 can rotate the roller 11 in both directions of rotation around pre-set angles, so that pre-determined thread lengths are supplied (thread feed) or pulled back in the direction of the spool (thread withdrawal). For thread withdrawal, thread bobbins not illustrated or a winding mechanism for the feed spool 4 are provided. The drive 10 including drive roller 11 is rotatably mounted so that it can be optionally swiveled against one of the rollers 6. For this purpose, the stitching head 1 can also be moved parallel to the axis of the rollers 6. If another upper thread has to be stitched, the drive mechanism 10, 11 is swiveled away from the roller 6 last driven in each case and then the stitching head 1 is moved parallel to the axis of the rollers 6, until the drive roller 11 is in the vicinity of the driven roller 6 of the stitching or sewing thread next to be stitched, in order thereafter to be pressed lightly or swiveled against the roller 6. The respective thread is wound off from the feed spool 4 and advanced by frictional force for loop formation or withdrawn by means of the other direction of rotation in order to complete the loop formation or stitching process. During the current stitching operation, the thread tension of the upper thread being stitched in each case is determined, in order to control thread withdrawal depending on the determined tension. The device according to Fig. 2 is expanded by additional thread take-up levers, whereby the thread tension can be additionally controlled or regulated during thread withdrawal by adjusting the respective thread cake-up lever 12. Functionally similar component parts compared to tne device according to Fig.l are described with the same reference numbers. Due to the additional use of the thread take-up levers 12, a thread reversing mechanism 13, 14 is needed, through the eyes 14 of which the upper threads are fed. Through the additional guidance of the upper threads by the thread take-up levers 12, the thread length between needle tip and drive roller 6 can be regulated additionally by vertical adjustment of the thread take-up levers 12, so that possibly the drive mechanism 10 only needs to be able to rotate in one direction It is, however, also conceivable that if the drive roller 11 is rotated in both directions for thread feed and thread withdrawal, the thread tension in the upper thread being stitched in each case is also regulated by means of the vertical positioning of the thread take-up lever 12. With both devices according to Figs. 1 and 2, the upper thread 3 is fed past a sensor 8 whereby through excursion of the upper thread 3 by means of sensor S the sensor 8 itself is subjected to pressure from the upper thread 3. The thread tension in the upper thread 3 can be determined from this pressure by simple conversion.' Fig. 3 shows a detailed view of the drive mechanism 10 with driven roller 11, which is lightly pressed against roller 6. The roller 6 is looped once or several times by an upper thread 3, so that the upper thread cannot slip through on the roller 3. Possibly, the surface of roller 6 is rubberized, so increased friction is produced between upper thread 3 and roller 6. The mounting plate for the axle of the roller 6 is fixed on the stitching head 1 by .r.eans of the fastening part 15. A guide rail 15, which comprises several window-like openings 5c ' in the form of eyes, is positioned as it were on the mounting device 15. Figs. 4, 5 and 6 show typical tension gradients during a stitch or loop formation. Fig. 4 in this case shows a tension gradient, in which both the lower thread ana the upper thread have a function. The first tension peak in the angle range of approx. 50° is caused by threading the lower thread through the loop formed by the upper thread. If the lower thread has broken, the strength exerted by the lower thread on the upper thread is reduced, and the first tension peak, as shown in Fig. 5, turns out to be considerably smaller. On the other hand, if the upper thread has broken, then only very slight thread tension is detected by the sensors (Fig. 6). Fig. 7 shows a device to measure the thread tension in the case of a multi-thread stitching or sewing head. The upper threads 3 are fed via a thread reversing mechanism 16, 17, whereby the upper thread 3 just stitched exerts forces on the U-shaped part 16 duer to looping of the parts 16, 17, whereby the U-shaped part 16 again exerts forces on the mounting device 19. As shown in Fig. 8, each mounting device 19 consists of two angular brackets 20, 23, which are joined to one another by means of a screw 22 in each case. Both free ends of the U-shaped part 16 are attached by means of such a mounting device 19 to the front la of the stitching head 1. The ends of the U-shaped part 16 are attached by means of connecting screws 24 to the one leg of the angular bracket 23. The other leg of the angular bracket 23 is connected by means of the connecting screw 22 with the first leg of the lower angular bracket 20. This leg comprises a thin-walled area 20a, which is bent by the tension in the upper thread. The deformation of the angular area 20a is recorded by means of a sensor S shown in Fig. 9, whereby conclusions about the thread tension in the upper thread just stitched are possible. The other leg of the lower angular bracket 20 is attached to the stitching head 1 by means of a screw 21. The upper reversing bar 17 is positioned by means of fastening parts 18 and screws 18a above the reversing mechanism 16. The reversing mechanism or the U-shaped part 16 comprises eyes 16, through which an upper thread is guided in each case. Fig. 9 shows a sectional view through the reversing mechanism according to Figs. 7 and 8. In the thin-walled area 20a, a wire strain gauge as sensor S is bonded onto the lower surface of the angular bracket 20, which records excursions or deformation of the leg of the lower angular bracket 20. The wire strain gauge or sensor S, in order to prevent damage or contamination, is sealed with as flexible a material as possible. Advantageously, the supply lines 25 to the sensor S are arranged in such a way that despite deformation of the angular bracket 20 are onxy exposed to minor mechanical stress, so that they are not subject to increased wear and tear. The dimensions of the mounting device 19, 20, .23 for attaching the U-shaped part 16 to the stitching head 1 should be such that the small forces F arising, which due to the thread tension of the upper threads bear on the U-shaped part lead to sufficiently large deformation of the leg with the thin-walled area 20a of the angular bracket 20. For this reason, leverage ratios are to be configured accordingly. It should be ensured that due to mechanical stress and natural vibration of the stitching head the intrinsic movements of the stitching hesd do net lead to vibration of the angular- bracket 20 and thus to false readings. WE CLAIM: 1. A device for stitching or a sewing machine comprising : - a thread driving mechanism (10), having a roller (11) mounted for rotating about an axis, said roller driven by the drive unit (10) in both directions about the axis thereof; and - a feed spool (4) for winding off an upper thread (3) for thread feed or loop formation, by turning said roller (11) in one direction, and pulling back the upper thread (3) for thread withdrawal by rotating the roller in the opposite direction, thus drawing the stitch or loop; characterized in that a measuring device (8) is provided for measuring the tension in the upper thread (30) during a stitching or sewing process so that the thread drive mechanism (10) can be controlled for thread feed and thread withdrawal depending on the determined thread tension. 2. Device as claimed in claim 1, wherein said thread drive mechanism of the device is(designed to end thread withdrawal when level of determined thread tension exceeds a preset threshold value. 3. Device as claimed in claim 2, wherein the device i.e. sewing or stitching machine is designed to end the current stitch or loop formation if the threshold value is exceeded. 4. Device as claimed in claim 3, wherein the device i.e. sewing or stitching machine is Resigned to begin the next stitching or the next loop after finishing the stitch or loop formation. 5. Device as claimed in any one of the previous claims, wherein the device is designed to reduce the thread tension by controlling the thread drive mechanism, when the determined thread tension approaches a tension threshold value. 6. Device as claimed in any one of the previous claims, wherein the device is designed to continually compare the determined tension levels during thread withdrawal with tension levels stored in a data base and check whether the determined tension gradient lies within the standard range. 7. Device as claimed in any one of claims 1 to 5, wherein the device is designed ito carry out a plausibility check during thread withdrawal generally as to whether the measured tension levels lie within the standard range. 8. Device as claimed in any one of the previous claims, wherein the device is designed to generally check the tension gradient during or after the stitch or loop formation as to whether the tension in the thread has not reached certain tension threshold values at certain times during the stitch or loop formation, and in that case to detect the lower thread breakage. 9. Device as claimed in any one of the previous claims, wherein the device is designed to detect the upper thread breakage as soon as the thread tension no longer changes or only slightly. 10. Device as claimed in any one of the previous claims, wherein the device is designed to generally check the tension gradient during or after the stitch or loop formation as to whether the tension in the thread exceeds certain tension threshold values at certain times during the stitch or loop formation, and in that case further thread to gradually advance by means of the thread drive mechanism until a maximum permissible length of thread is reached or however the thread tension falls again below the tension threshold value. ll.Device as claimed in claim 10, wherein the device is (designed to interrupt the stitching or loop formation process if on reaching the maximum permissible thread length the thread tension is too much. 12.Device as claimed in any one of the previous claims, wherein the device is designed \to the length of thread supplied for the next stitch or loop formation calculate depending on at least one of the parameters; thread structure, thread composition, thread type, as well as kind, length and situation of the stitch or loop being formed next and to make available the computed thread length by means of the device. 13. Device as claimed in any one of the previous claims, wherein the device to record the thread tension of the upper thread current being stitched or sewn in the case of a stitching or sewing machine with several upper threads being stitched alternatively after one another comprises a thread reversing mechanism, which reverses the upper threads at least once, and that the device has at least one sensor to record the force exerted on the thread reversing mechanism (16,17) by the upper thread (3) currently being stitched or sewn. 14. Device as claimed in daiml3, wherein the thread reversing mechanism is fixed to the stitching head directly or by means of an intermediate part. 15. Device as claimed in claim 13 or 14, wherein the sensor is positioned between the thread reversing device and the switching head. 16. Device as claimed in any one of claims 13 to 15, wherein the thread reversing device is a U-part, which is fixed to the stitching head at its two ends directly or via an intermediate part. 17. Device as claimed in claim 16, wherein at least one reversing point for the at least one upper thread is arranged between the two ends of the U-part. 18. Device as claimed in claim 16 or 17, wherein excursion of a junction point from its rest position can be detected or calculated by means of a sensor in each case. 19. Device as claimed in claim 16 or 17, wherein one force arising at one or both junction points can be detected or calculated by means of a sensor in each case. 20. Device as claimed in any one of claims 16 to 19, wherein one eye forms a reversing point in each case. 21. Device as claimed in any one of the previous claims 16 to 20, wherein each end of the U-part is arranged on an angular bracket, whereby the deformation of at least one angular bracket can be recorded and/or calculated by means of at least one sensor in each case. 22. Device as claimed in claim 21, wherein the angular bracket has a thin- walled area, whereby control electronics with the at least one sensor determine the deformation of the area and/or the forces arising within this 23. Device as claimed in any one of the previous claims, wherein control electronics compute the thread tension of the thread just stitched or sewn from the deformation or excursion determined in each case. 24. Device as claimed in claim 23, wherein control electronics consider distance between the reversing point of the thread just stitched or sewn in the computation of the thread tension. 25. Device as claimed in claim 23 or 24, wherein control electronics averages the forces occurring at the two fixing points of the thread reversing mechanism arising the forces or weights these according to the distance of the reversing point of the thread just stitched or sewn, whereby the thread tension is calculated based on the averaged or weighted forces or torques. 26. Device as claimed in any one of the previous claims, wherein the sensor is a pressure sensor or a wire strain gauge. 27. Device as claimed in any one of the previous claims, wherein the sensor is a piezo element. 28. Device as claimed in claim in any one of the previous claims, wherein a control system of the sewing or stitching machine regulates the thread drive mechanism. 29. Device as claimed in any one of the previous claims, wherein a control system of the sewing or stitching machine regulates the thread drive mechanism and that the control system of the sewing or stitching machine determines the tension in the upper thread by means of the measuring device. 30. Device as claimed in any one of the previous claims, wherein a control system of the sewing or stitching machine regulates the thread drive mechanism or that the control system of the sewing or stitching machine determines the tension in the upper thread by means of the measuring device. 31. Process for forming at least one stitch or at least one loop using a device according to one of the previous claims, wherein a pre-determined thread length is made available with the aid of the device for forming a loop of the upper thread underneath the stitching foundation, and that next the lower thread is transported by the shuttle through the formed loop, as a result of which by transporting the lower thread through the loop the upper thread is tensioned, and that the tension in the upper thread is determined by means of the measuring device, whereby if a tension threshold valuers exceeded gradually more upper thread is advanced with the aid of the device until a maximum permissible length of upper thread is reached or however the thread tension falls again below the tension threshold value. 32. Process as claimed in claim 31, wherein if on reaching the maximum permissible thread length, the thread tension is still too much, the stitching or loop formation process is interrupted. 33. Process as claimed in claim 31 or 32, wherein after the lower thread has been fed through the loop formed by the upper thread, the upper thread is tightened with the help of the device, until a pre-set, calculated or predefinable tension threshold value is reached. 34. Process as claimed in any one of claims 31 to 33, wherein the tension of the upper thread is determined within the time frame, in which the lower thread has to be fed by means of the shuttle through the loop formed by the upper thread, whereby breakage of the lower thread is detected, as soon as the thread tension of the upper thread does not exceed a minimum threshold value within the time frame. 35. Process as claimed in any one of the claims 30 to 34, wherein breakage of the upper thread is detected, as soon as the determined tension in the upper thread does not change during pre-set or pre-definable period or only slightly. Dated this 23rd day of October, 2003 B B SEN L S DAVAR & CO APPLICANTS' AGENT The invention relates to a device for a stitching or sewing machine, said device comprising a thread drive mechanism (10) with a roller (11) mounted to rotate about an axis, which may be driven by a drive unit in both directions about the axis thereof. On turning said roller in one direction, an upper thread (3) for thread feed or loop formation Is wound off a feed spool (4) and by rotating the roller (11) in the opposite direction, the upper thread is pulled back (thread withdrawal) and thus drawing the stitch or loop. During the stitching or sewing process a measuring device (8) measures the tension in the upper thread and the device controls the thread drive mechanism depending on the determined thread tension.

Documents:

1365-kolnp-2003-granted-abstract.pdf

1365-kolnp-2003-granted-claims.pdf

1365-kolnp-2003-granted-correspondence.pdf

1365-kolnp-2003-granted-description (complete).pdf

1365-kolnp-2003-granted-drawings.pdf

1365-kolnp-2003-granted-examination report.pdf

1365-kolnp-2003-granted-form 1.pdf

1365-kolnp-2003-granted-form 18.pdf

1365-kolnp-2003-granted-form 2.pdf

1365-kolnp-2003-granted-form 26.pdf

1365-kolnp-2003-granted-form 3.pdf

1365-kolnp-2003-granted-form 5.pdf

1365-kolnp-2003-granted-reply to examination report.pdf

1365-kolnp-2003-granted-specification.pdf