EP0348436A1 - Thread-cutting device for zig-zag sewing machines. - Google Patents

Thread-cutting device for zig-zag sewing machines.


Publication number
EP0348436A1 EP19880903802 EP88903802A EP0348436A1 EP 0348436 A1 EP0348436 A1 EP 0348436A1 EP 19880903802 EP19880903802 EP 19880903802 EP 88903802 A EP88903802 A EP 88903802A EP 0348436 A1 EP0348436 A1 EP 0348436A1
European Patent Office
Prior art keywords
cutting blade
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.)
Application number
Other languages
German (de)
French (fr)
Other versions
EP0348436B1 (en
Ernst Albrecht
Harald Dinges
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.)
G M Pfaff AG
Original Assignee
Pfaff Industriemaschinen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE3715603 priority Critical
Priority to DE19873715603 priority patent/DE3715603C1/en
Application filed by Pfaff Industriemaschinen GmbH filed Critical Pfaff Industriemaschinen GmbH
Publication of EP0348436A1 publication Critical patent/EP0348436A1/en
Application granted granted Critical
Publication of EP0348436B1 publication Critical patent/EP0348436B1/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical



    • D05BSEWING
    • D05B65/00Devices for severing the needle or lower thread
    • D05BSEWING
    • D05B73/00Casings
    • D05B73/04Lower casings
    • D05B73/12Slides; Needle plates


La lame (28) de coupe-fil est mobile sur un plan parallèle à l'attrape-fil (33) et reliée par un mécanisme de transmission (45 à 58) à sections d'arrêt (54, 55) avec l'entraînement de l'attrape-fil (33) de façon à pouvoir se déplacer avec ce dernier jusqu'à la position de coupe au-dessous du centre du trou de l'aiguille. The blade (28) of wire cutter is movable in a plane parallel to the thread catcher (33) and connected by a transmission mechanism (45 to 58) to stop sections (54, 55) with the drive of the thread catcher (33) so as to be movable therewith to the cutting position beneath the center of the needle hole. Pendant que la lame (28) du coupe-fil reste stationnaire dans la position de coupe, l'attrape-fil achève l'opération de séparation des fils. While the blade (28) of the cutting thread remains stationary in the cutting position, the thread catcher completes the son of the separation operation. La lame (28) du coupe-fil ne se déplace en arrière qu'une fois que les fils ont été sectionnés pendant le mouvement en arrière de l'attrape-fil (33). The blade (28) of the cutting wire from moving back once the son were sectioned during the backward movement of the thread catcher (33). Le mécanisme (45 à 58) de transmission de la lame (28) du coupe-fil est craboté, ce qui permet de sectionner de manière fiable même de gros fils. The mechanism (45 to 58) of transmission of the blade (28) of wire cutters is interlocked, allowing to cut reliably even large son.


Fadeπschneidvorrichtung for zigzag sewing machines

A Fadeπschneidvorrichtung according to the preamble of claim 1 is known from DE-GM 1,968,920. In this Fadenschπeidvorrichtuπg which is attached at a lateral distance to laπglochförmigen tap hole cooperates with the cutting edge of the cutting blade 5 Fadeπfäπgers on the underside of the needle plate.

Since the needle at the zigzag sewing in a l ° stitch position at a greater distance to the fixed cutting blade than in the other result when Fadeπschneiden unequal length Fadeneπdeπ on the workpiece, wherein the shortest yarn ends on the side facing the cutting blade and the longest filament ends in him About 15abgewandten stitch are formed.

DE-PS 31 24 795 a further thread cutting device for zigzag sewing machines is known wherein the Fadeπfänger to achieve by

of the puncture position of the needle independent of the length associated with the needle and the thread supply Nadelfadeπendes at its opposite side a second barb barbs for the leading leg for the needle of the needle thread loop

25aufweist. However, the arrangement of the second barb has no effect on the length of the Fadeπenden on sewing material, ie, the length of which depends, as in the former Fadeπschneidvorrichtuπg from the last injection position of the needle. Finally, from DE-PS 17 60 703 for Fadeπschπeidvorrichtuπg

Doppelketteπstich sewing machine is known having a movable parallel to the needle plate plane Fadeπfänger with a cutting edge and a to this arranged in parallel and movable in the same direction and a cutting knife with the cutting blade mitbewegbare thread clamp. The Fadeπfäπger is provided with a pin which communicates with a respective Läπgsschlitz of the cutting blade and the Fadεπklemme engaged such that the cutting knife and the yarn clamp are each then entrained by the thread catcher from the rest position into the working position and vice versa, when the pin all the has traversed the length of the Längsschlitze-. In order to prevent that the cutting knife and the thread clamp to move prematurely and in an uncontrolled manner, they are of a

Federrastgesperre held in its two end positions.

Besides the fact that this thread cutting device not for lockstitch - but for

Doppelketteπstich sewing machines has been designed which also does not serve for the production of zigzag stitches but by Geradstichπähten, nor is it likely also to Durchtrenπen thicker and tear-resistant threads, opposing the cutting of such a high resistance that .the applied for the cutting force is greater than the holding force of the Federrastgesperres. In that case, the cutting blade would forced out before the complete cutting of threads from actually provided closely situated next to the tap hole Schπeidstellung and Schneidvorgaπg completed only in the relatively distant from the needle hole rest of Schπeidmessers. In this way, but undesirably long thread ends at the sewing material would result.

The object underlying the invention is to form a Fadenschπeidvorrichtung for zigzag sewing machines so that uniformly short thread ends are obtained on the workpiece regardless of the stitch position of the last stitch. This object is solved by the characterizing features of claim 1.

The measure to move the cutting blade in a location below the center of the stitch width, and thus the center of the Längserstreckuπg of the needle hole cutting position, the werkstü.ckseitige legs of the Nadelfad.enschleife and the looper thread are always cut off with a very short distance from the workpiece. The stitch position of the last stitch has no appreciable effect. the Schπeidergebnis, so that essentially be achieved always the same short Fadeπeπden.

By the measure according to claim 2, DAS cutting blade via a positive transmission to be connected to the drive of the Fadenfäπgers, an inevitable coupling of the movement of the thread catcher is obtained with that of the Schπeidmessers, whereby increased Schπeidwiderstände as such. B. can auftr.eten when dividing thicker and more resistant to tearing threads are reliably overcome.

In claim 3, an advantageous structural configuration of the Fadeπschneidvorrichtung indicated. To order the measure, the thread catcher, the Schπeidmesser and angle lever on "the needle plate, there is the possibility of being able to install the Fadenschneidvorrichtuπg later still in already delivered sewing machines.

The specified in claim 4 forming the Fadenfäπgers provides improved Annähsicherheit at the start of the next sewing work in conjunction with the particularly short werkstückseitigeπ yarn ends. This is done in such a way that immediately after the penetration of the separating tip of Fadeπfängers in the 0 needle thread loop of the needle-side loop leg from Haltefiπger, that is detected by the incision between Haltefiπger and separator finger and thereby already tightened by Nadelfadeπvorrat during further division process thread. in the further course of the gripper ^ When the needle thread loop around the

Bobbin case has led around the Greiferfadeπ and the workpiece side leg of the needle thread loop behind the barbs of the Fadenfäπgers lie. The barbs from the Nadelfadeπ then runs under the Fadenfäng.rr 0 along as πadelseitiger Schleifenscheπkel to the

Incision between holding and Separierfiπger, which he then ascends to the needle hole. Since the needle-side loop leg so does not rise from the barbs of directly to the tap hole but makes the detour via the 5 incision between holding and Separierfiπger, after thread cutting, the needle-side yarn end is by the amount of detour longer and thus increases the Annähsicherheit accordingly.

° The present invention is explained based on an illustrated in the drawings embodiment. It shows:

Fig. 1 is a partially sectioned view of a portion of a sewing machine with the 5 Fadeπschπeidvorrichtung; Figure 2 shows a part of the Antriebsmechaπis us the Fadeπschneidvorrichtung.

Figure 3 is a perspective view of the needle plate and the thread cutting device with a view from below of the device parts.

Fig. 4 is a partially sectioned perspective

Representation of the thread catcher, and the cutting blade and the needle plate;

Fig. 5 shows the thread path immediately before -.-

Severing, wherein the stitch last formed was in the left stitch position;

Fig. 6 shows the thread profile corresponding to Fig. 5 but with the right stitch position.

The sewing machine has a housing (1) consisting of a carrier plate (2), a base (3), a support arm (4), a stator (5) and an arm (6), in a head (7) expires. In the arm (6) is mounted an arm shaft (8) via a crank (9) and a handlebar (10) drives a needle bar (11). In the needle bar (11) has a thread-guiding needle (12) is attached.

The needle bar (11) is accommodated in a frame (13), stored the running on a parallel to the longitudinal axis of the arm (6), pin (14) slidably and with a plane parallel to it the push rod (15) is connected. The push rod (15) forms the driven member of a known, not shown zigzag stitch plate. Such a stitch regulator is shown for example in DE-PS 33 20 158 and described.

The needle (12) operates to form double stitches, together with a supporting arm (4) arranged double rotary hook (16) having a rotary hook body (17) and a fixed bobbin case (18). In the support arm (4) is a needle plate (19) is arranged which has for the passage of the needle (12) is a laπglochartiges needle hole (20) above the gripper (16).

On the support arm (4) is arranged a workpiece holder (21) having a lower clamp jaws (22) and an upper Klammerbackeπ (23). The upper

Klammerbackeπ (23) contains a spring-loaded

Holding plate (24), in a known manner about a

Rolleπhebel (25) and a substantially vertically movable pressure plate (26) can be lifted from the lower Klammerbackeπ (22). The Vorschubbewegungeπ of the fabric holder (21) and the setting of the zig-zag stitch regulator are controlled by an unillustrated Kurveπscheibe, as it is disclosed in the aforementioned DE-PS 33 20 158th

In one on the underside of the needle plate (19) in the region of the stitch hole (20) provided parallel to the plane of rotation of the gripper extending (16) flat Führungsπut (27) is designed as a flat slider cutting blade (28) slidably disposed. The cutting knife (28) comprises a rectangular recess (29) whose left in the drawing lower Begreπzungskaπte forms a cutting edge (30). The Schπeidmesser (28) is held bolted by "two on the throat plate (19) Führuπgsstücke (31) against falling.

The Führuπgsstücke (31) formed with one step-like recess (32) together form a guide for a formed as a flat slider thread catcher (33) rests directly on the underside of Schπeidmessers (28) and how this parallel to the plane of rotation of the gripper (16) is slidable. The right according to the drawing, always outside the Führuπgsstücke (31) remaining end portion of the

Fadeπfεngers (33) is arched upwards by a small amount and running in a substantially centrally disposed elongate separating tip (34). With a small lateral spacing from the separating tip (34) is provided a short retaining finger (35), which is formed between separating tip (34) and holding fingers (35), an incision (36) has a groove-like shape.

The Fadeπfäπger (33) has a laπglochartige, longitudinal recess substantially in its upwardly curved portion. (37) on which the separating tip (34) end facing in the vertex plane of the arched portion is t which forms the semi-circular upper Begreπzuπgskaπte the recess (37) has a cutting edge (38). In the thread catcher (33) is provided extending recess (39) further includes a slanted toward the recess (37), thereby forming a barb (41) is formed in connection with the longitudinal edge (40). At the end opposite the separating tip (34) end of the thread catcher (33) form two by bent-down tabs (42, 43) a guide for a ball pin (44) of a drive lever (45) (by means of a collar screw (46) on the throat plate 19 is supported).

The drive lever (45) is connected via a hinge pin (47) with a tie rod (48) in connection whose opposite end is bent downward. The pull rod (48) has, in the bent portion has a longitudinal rectilinear guide slot (49) and carries a short, upwardly projecting pin (50). In the guide slot (49) engages one of the stitch plate (19) attached hinge pin (51) on which a flat angle lever (52) is mounted.

In the one, located between the bent portion of the pull rod (48) and the needle plate (19) extending leg of the angle lever (52) a control slot (53) is provided, in which the pin (50) engages. The control slot (53) is in two Stillstaπdsabschnitte (54, 55) is divided and an interposed moving section (56). At the end of the other leg of the Wiπkelhebels (52) an oblong hole (57) is formed into which a on the cutting blade (28) fixed pin (58) engages.

On the hinge pin (47) of Antriebsh.ebels (45) engages one end of a pull rod (59), the other end with a support (60) is connected. The carrier (60) is mounted on a rotatably mounted and axially displaceable Gleitstaπge (61). On the sliding rod (61), a sensing lever (62) is fixed, having a cam follower (63). One on the Gleitstaπge (61) arranged biased leg spring (64) which at one end is hooked to a rib of the pedestal (3) and at the other on the carrier (60) exerts on the slide bar (61) a in FIG. 2 counterclockwise turning torque out.


The sensing lever (62) cooperates with a cam disc (65) having a cam groove (66) and is mounted on a shaft (67). The shaft (67) is connected via a Zahπrie eπgetriebe (68) with the arm shaft (8) in

10 Antriebsverbinduπg. The sensing lever (62) is a

assigned electromagnet (69) (Fig. 2), which arranged above one on the pull rod (70) pressure member (71) on the underside of the sensing lever (62) engages.

15 to the sensing lever (62) further includes a pawl (72) associated with the two stepped shoulders (73, 74) and rotationally fixed on a shaft (75) is arranged. One on the shaft (75) arranged biased leg spring (76) of the one end on a rib

20 base (3) and the other end on the locking pawl (72) is mounted, exerts on the shaft (75) a in Fig. 2 corresponding to the clockwise torque from.

On a shaft (77) is a three-armed lever (78) is arranged 25 for rotation therewith. At one arm is a

Shift rod (79) articulated, having a Führuπgsschlitz (80) engages in the housing a fixed pin (81). At the free end of the switching rod (79) a wedge-shaped projection ('82) is formed which cooperates with a 30 correspondingly formed projection (83) of the Sperrkliπke (72). On another arm of the lever (78) is a pull rod

(84) aπgelenkt communicating via an unillustrated link mechanism to the pressure plate (26) in such a way in connection, that the pressure plate (26) moves and at a in FIG. 1 in the counterclockwise direction taking place Schwenkbeweguπg of the lever (78) downward as a result of which the holding plate (24) of the upper Klammerbackeπs (23) is raised. an electromagnet used for carrying out the Schweπkbeweguπg of the lever (78)

(85) arranged on a on its Zugs.tange (86) pressure member (87) engages the third arm of the lever (78).

On the shaft (77) is further attached to a one-armed Aπtriebshebel (88). The free end of Aπtriebshebels (88) is an on sensing lever (62) is associated formed, inclined shoulder (89).


Several stitches before the end of a seam the rotational speed of the sewing machine is reduced to the so-called Schπeiddrehzahl from which the sewing machine can be stopped out practically without delay.

During the last Stichbildevorgaπges a suture of the electromagnet (69) is about the time at which the needle (12) from the needle hole (20) is pulled, pressurized, whereupon he the sensing lever (62) from the position shown in Fig. 2 position pivots to pivot upwardly and thereby extending the cam follower member (63) in a no slope, unspecified arrest portion of the cam groove (66). Up to this time, the thread catcher (33) and the Schπeidmesser (28) are in the lateral distance to the needle hole (20) lying rest position. Upon reaching the raised position of the sensing lever (62), the leg spring (76) pivots the locking pawl (72), based on Fig. 2, to the right, whereby the shoulder (74) slides beneath the front end of the sensing lever (62) and on thus secures its position.

Shortly after the pivoting of the cam follower (63) in the cam groove (66) of the synchronous with the arm shaft (8) rotating cam plate (65) is effectively an arcuately extending in an axial direction moving section (66a) of the cam groove (66), whereby the Kurveπfolgeglied ( 63) and the sensing lever (62), based on Fig. 1, are shifted to the right. The pushing movement of the sensing lever (62) is transmitted via the Gleitstaπge (61), the carrier (60) and the pull rod (59) on the Aπtriebshebel (45), thereby executing a Schweπkbeweguπg.

Due to the pivoting movement of the drive lever (45) of the thread catcher (33) and the pull rod (48) are based on Fig. 3, shifted to the right in their end position shown in this figure. Here, the separating tip (34) in which the gripper (16) enters the needle thread loop formed with its the workpiece (W) leading leg (NW) and the looper thread (G) on the Läπgskante (40) come to rest, during the needle (12) leading leg (NN) of the Begreπzuπgskante of

Incision (36) is detected between the separating tip (34) and the Haltefiπger (35). In the further course of the catcher or claw movement Nadelfadεπschleife completely by the gripper (16) about the Spuleπkapsel (18) is guided and the Fadenfäπger (33) penetrates so far into the needle thread loop in until the workpiece (W) leading yarn leg ( NW) and the Greiferfadeπ (G) from the longitudinal edge (40) and slide (behind the barbs 41) enter the recess (39).

During the forward movement of the thread catcher (33) yarn is withdrawn from the needle thread supply. After the gripper (16) the Nadelfadeπschleife the Spuleπkapsel has led around (18), it is that of the well-known not shown yarn encoder

drawn sewing machine according to above, wherein it lies down in such a way around the thread catcher (33), that the needle-side loop leg (NN) from the needle hole (20) through the notch (36) and the two recesses (39 and 37) to the cutting edge (38) and the workpiece side Schleifenscheπkel (NW) from the cutting edge (38) for stitch hole (20).

Due to the simultaneously with the movement of the thread catcher (33) running displacement of the drawbar (48) moves this to the Führuπgsschlitz (49) relative to the stationary pivot pin (51), said pin (50) within the control slot (53) is moved. As long as the pin (50) within the substantially 5 parallel to the longitudinal axis of the tension lever (48) extending arrest portion (54) moves, the position of the Wiπkelhebels (52) remains unchanged and the Schπeidmesser (28) remains in its rest position, in which its cutting edge (30) has a lateral distance from the needle hole ° (20). Once the pin (50) in the

Moving portion (56) occurs, it causes Vεrschwenkeπ of the angle lever (52) and thus a displacement of the Schπeidmessers (28), this movement takes place substantially in synchronism with the movement of the Fadeπfäπgers 5 (33). When the pin (50) has reached the end of the moving portion (56) is the cutting edge (30) below the center of the needle hole (20), wherein the cutting blade (28) has reached its Schπeidstellung. During the subsequent movement of the pin (50) within the Stillstandsabschπittes (55) of Wiπkelhebel (52) remains unchanged in its new position, whereby the cutting blade (28) also remains in the Schπeidstellung.

The sewing machine is stopped shortly after reaching top dead center of the needle movement. Here, the cam follower member (63) is in the apex of the arc-shaped in the axial direction Beweguπgsabschnittes (66a), said thread catcher (33) and the drawbar (48) have their relative to the drawing, reaches right end position.

After the stopping of the sewing machine, the electromagnet (85) is acted upon, after which he verschwenkeπ the three-armed lever (78) and the drive lever (88), based on Fig. 1, in the counterclockwise direction. Due to this Schweπkbeweguπgen on the pull rod (84) is actuated, the pressure plate (26) and raised the holding plate (24). At the same time, the switching rod (79) 1, the pawl (72) against the action of the leg spring (76), based on Fig., Pulled to the right and fed via the wedge-shaped projection (82) which cooperates with the lug (83) pivoted back whereupon the leg spring (64) pivots the sensing lever '(62) back downward and thereby the cam follower member (63) from the cam groove (66) removed. Once the cam follower member (63) is disengaged from the cam groove (66), the free end of the drive lever (88) lies against the shoulder (89) and then shifts the sensing lever (62) in the axial direction back to the in Fig. 1 shown initial position.

This push-back movement of the sensing lever (62) is transmitted via the tie rod (59) on the drive lever (45), whereupon the thread catcher (33) and the pull rod (48) retracts. Since in this case the pin (50) (55) first moves within the Stillstaπdsabschnittes that Schπeidmesser (28) remains in the 0 Schπeidstellung are due to the formation of the control slot (53) until the thread catcher (33) with its cutting edge (38) hinweggeglitten over the cutting edge (30) of the cutting blade (28) while the needle thread (N) and the looper thread (G) 5 ^ were durchtrenπt.

.After the cutting of the threads of the pin (50) enters the Beweguπgsabschπitt (56) of the control slot (53) and causes "characterized in that the angle lever (52) again 0 verschweπkt and the cutting knife (28) in its Ruhe¬ or ' starting position is pushed back. then, when the. pen ~ (50) in the Stillstaπdsabschnitt (54) occurs, the cutting blade (28) remains in the previously reached position while the 5 Fadeπfäπger (33) further into its rest or starting position is retracted, in which the separating tip (34) from the region of the stitch hole (20) is completely removed. - -

° as a comparison of Fig. 5 and 6 are formed by the inventive Fadeπschπeidvorrichtuπg regardless of the stitch position of the last stitch is substantially equal to a short workpiece side Fadeneπden. In the same way, the length of 5 m of the needle (12) remains connected needle thread end of the respective stitch location substantially unaffected. As Figs. 5.and refer 6 also, the length of the needle (12) depends connected Nadelfadeπendes on the distance of the incision (36) from the opposite boundary edge of the recess (39). By appropriate design of the thread catcher (33) can vary the length of this yarn end.


1. Fadeπschneidvorrichtung to zig-zag sewing machine with a one tap hole having needle plate, an orbiting lockstitch gripper and a movable depending on the angular position of the gripper shaft Fadeπfänger which has a separating tip, a barb for the leading to the fabric legs of the Nadelfadeπschleife and the looper thread, and a cutting edge that durchtreππt the threads detected by the barb in co-operation with a cutting blade, characterized in that the cutting blade (28) in a to the thread catcher (33) movable parallel plane and through a transmission (45 to 58)
Arrest portions (54, 55) is connected to the drive in such a way that the cutting blade (28) together with the Fadeπfänger (33) from a lying laterally of the stitch hole (20) rest position with its cutting edge (30) in a in a region below the middle the stitch width located Schneidstelluπg movable and after the separating and Durchtrenπeπ the threads through the after introduction of the cutting blade (28) in the Schπeidstelluπg further moving Fadenfäπger (33) together with the latter again can be returned to the rest position.
2. Thread cutting device according to claim 1, characterized in that the gear (45 to 58) for the cutting knife (28) is adapted form-fit. η.
3. Fadenschπeidvorrichtung according to claim 1 and 2 characterized in that the Fadenfäπger (33) and the cutting knife (28) arranged by common means (31) on the throat plate (19) and are guided, and a drive lever (45) of the Fadeπfängers (33) angle lever via a tie rod (48) having a by a hinge pin (51) to the needle plate (19) mounted (52) is connected by the hinge pin (51) in a guide slot (49) of the drawbar (48) and on the connecting rod (48) fixed pin (50) in a control slot (53) of Wiπkelhebels (52) engages, and that the angle lever (52) via a slot-pin connection (57, 58) is articulated on the cutting blade (28).
4. Thread cutting device according to one or more of claims 1 to 3, characterized in that the Fadeπfäπger (33) on the barb (41) facing away side with lateral spacing from the separating tip (34) has a holding finger (35) for the (to the needle 12 ) leading leg (NN) comprises the needle thread loop.
EP19880903802 1987-05-09 1988-04-19 Thread-cutting device for zig-zag sewing machines Expired - Lifetime EP0348436B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3715603 1987-05-09
DE19873715603 DE3715603C1 (en) 1987-05-09 1987-05-09 Thread cutting device for zigzag Sewing machines

Publications (2)

Publication Number Publication Date
EP0348436A1 true EP0348436A1 (en) 1990-01-03
EP0348436B1 EP0348436B1 (en) 1992-09-30



Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880903802 Expired - Lifetime EP0348436B1 (en) 1987-05-09 1988-04-19 Thread-cutting device for zig-zag sewing machines

Country Status (8)

Country Link
US (1) US5005504A (en)
EP (1) EP0348436B1 (en)
JP (1) JP2912374B2 (en)
KR (1) KR950012454B1 (en)
BR (1) BR8807499A (en)
DE (1) DE3715603C1 (en)
ES (1) ES2007485A6 (en)
WO (1) WO1988008894A1 (en)

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Also Published As

Publication number Publication date
ES2007485A6 (en) 1989-06-16
KR950012454B1 (en) 1995-10-18
EP0348436B1 (en) 1992-09-30
DE3715603C1 (en) 1988-06-23
WO1988008894A1 (en) 1988-11-17
JPH02503389A (en) 1990-10-18
US5005504A (en) 1991-04-09
BR8807499A (en) 1990-05-08
JP2912374B2 (en) 1999-06-28

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