EP0413699A1 - Nähmaschine mit nadeltransport. - Google Patents
Nähmaschine mit nadeltransport.Info
- Publication number
- EP0413699A1 EP0413699A1 EP89904043A EP89904043A EP0413699A1 EP 0413699 A1 EP0413699 A1 EP 0413699A1 EP 89904043 A EP89904043 A EP 89904043A EP 89904043 A EP89904043 A EP 89904043A EP 0413699 A1 EP0413699 A1 EP 0413699A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- needle
- feed
- sewing machine
- control unit
- stepping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B27/00—Work-feeding means
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B27/00—Work-feeding means
- D05B27/10—Work-feeding means with rotary circular feed members
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B19/00—Program-controlled sewing machines
- D05B19/02—Sewing machines having electronic memory or microprocessor control unit
- D05B19/12—Sewing machines having electronic memory or microprocessor control unit characterised by control of operation of machine
- D05B19/16—Control of workpiece movement, e.g. modulation of travel of feed dog
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
- D05D2207/00—Use of special elements
- D05D2207/05—Magnetic devices
- D05D2207/06—Permanent magnets
Definitions
- the invention relates to a sewing machine according to the preamble of claim 1.
- Needle, pusher wheel and roller foot are driven by stepper motors working independently of one another.
- a sewing machine with a fixed needle bar guide is known from DE-PS 35 16 715.
- the feed takes place exclusively via the slide wheel and roller foot, both feed units being connected to their own stepper motor drive.
- the feed units are driven here - in contrast to the sewing machine with needle feed - only during the cut out phase of the needle.
- the invention specified in claim 1 is therefore based on the object of making the feed drive by the needle switchable on and off in a sewing machine with a needle drive.
- the switchover can be done manually or by entering a program sequence.
- the drawing shows an embodiment of the invention in a sewing machine with a needle feed.
- FIG. 1 is an overall view of a sewing machine equipped with needle feed, partly in section, 2 is an enlarged side view of the sewing machine of FIG. 1, partially in section,
- Fig. 6 shows a section through the throat plate of
- Fig. 7 is a diagram of the feed movement
- the sewing machine consists of the base plate (1), the column (2), the stand (3), the arm (4) and the head (5).
- a main shaft (6) is mounted in the arm (4) in a conventional manner and is driven by a sewing motor (8) attached below the base plate (1) via a V-belt (7).
- the main shaft (6) is driven by a toothed belt (9), a gripper shaft (10) mounted in the base plate (1), which is in drive connection with a gripper (not shown).
- the main shaft (6) drives a needle bar (14) equipped with the needle (13) via a crank (11) and a link (12).
- the handlebar (12) is articulated to the needle bar (14) via an articulated connection (15) (Fig. 2).
- This is mounted in a rocker (17) carried by an oscillating shaft (16) (FIG. 1).
- the oscillating shaft (16) is parallel to the main shaft (6) stored in the arm (4).
- the end of the oscillating shaft (16) projecting into the stand (3) carries a lever arm (18) which is connected to an eccentric rod (20) via a hinge pin (19). This engages around an eccentric (21) (FIG. 4) which is firmly connected to a drive shaft (22) of a stepping motor (23) fastened in the arm (4).
- the eccentric (21) is guided with a pin (24) in a housing bore (25) running coaxially to the drive shaft (22).
- a carrier (30) is mounted on an eccentric bolt (31), the bearing pin (34 and 35) projecting into bores (32 and 33) in the column (2). having.
- the bearing journal (35) is provided with a slot (36).
- the eccentric (31) is clamped to the carrier (30) by a screw (37).
- a standing shaft (38) is mounted in the carrier (30) and is guided in the axial direction by an adjusting ring (39) and a coupling (40).
- the carrier (30) is equipped at the lower end with a flange plate (41) on which a stepper motor (42) is fastened, the drive shaft (43) of which is rigidly coupled to the standing shaft (38) by the coupling (40).
- the standing shaft (38) carries a pinion (44) of a spiroid gear (45), the ring gear (46) of which is firmly connected to a sliding wheel (47), which is ball-bearing-mounted in a known manner, and an inner part with an axle stub (48).
- This is received by a bore in an arm (30a) of the carrier (30) and can be clamped in place in the axial direction by a screw (49).
- the slide wheel (47) can be adjusted in height by means of the support (30) relative to a needle plate (50) which closes the column (2) upwards and projects through it through a slot (50a).
- the stitch plate (59) is provided with a stitch slot (50b) (see also Fig. 6) for the passage of the needle (13).
- the carrier (30) is firmly clamped to it by a screw (51) screwed into its upper part, which projects through a slot (52) in the column (2).
- the lateral position of the pusher wheel (47) can be aligned with the slot (50a) in the throat plate (50).
- a vertically extending shaft (53) is loosely mounted in the head (5) of the sewing machine.
- a clamping piece (54) is screwed onto the shaft (53). This has a radial bore in which a pin (55) is pressed.
- a coupling piece (56) is loosely mounted on the shaft 53.
- a web (57) protruding laterally from it protrudes through a slot in the head (5) and secures the coupling piece (56) against rotation.
- the coupling piece (56) is designed as a ring cutout in its lower region and thus engages around it
- the ring cutout has a recess (59) into which the pin (55) protrudes and which at one end merges into a locking groove (60), while at the other end it ends with a wall (61).
- a compression spring (62) which is supported against an adjusting ring (63) fastened on the shaft (53), presses the coupling piece (56) and thus the upper wall of its ring section slightly downwards against the pin (55).
- the free end of a leaf spring (64) rests on the web (57) (FIG. 3), which is fastened in the arm (4) and presses the coupling piece (56) downward.
- a lever arm projects a mounted in the head (5) Winkelheb ⁇ ls (66) d ⁇ r not shown üb ⁇ r a Lenk ⁇ r (67) with a "is connected from the Solungsp ⁇ rson operable HebelgestCode ⁇ .
- a cam is attached to a shaft (69) mounted in the head (5), the shaft (69) (Fig. 2) carries a hand lever (70) on its outwardly projecting end.
- a block (71) is attached, which is equipped with a groove guide (72).
- An angular flap (73) with an elongated hole is screwed into this, which is firmly connected to a roller support (74).
- This has a pipe socket (75) (see also FIG. 3) which merges into an end piece (76) projecting downwards. In this there is a hole for fastening one
- Axle stub (78) of a roller bearing (80) with ball bearings is provided.
- the roller foot (80) has a race (81) with which a ring gear (82) of a spiroid gear (83) is fixedly connected, the pinion (84) of which is in eccentric engagement with the ring gear (82).
- a tubular support (85) is accommodated in the pipe socket (75) and its position is clamped by screws (86) screwed into the pipe socket (75).
- the carrier (85) consists of a tube (87), a hollow cylinder (88) which adjoins upwards and an annular connecting flange (89).
- a shaft (90) is mounted in the tube (87), which carries the pinion (84) at its lower end and is firmly connected to an annular shoulder (91) which bears against the lower end of the tube (87).
- the shaft (90) is encompassed in the area of its upper end by the inner ring of a ball bearing (93) pressed in the hollow cylinder (88).
- the upper end of the shaft (90) is rigidly coupled by a coupling (94) to a drive shaft (95) of a stepping motor (96), the housing of which is screwed onto the end flange (89).
- a pulse disk (100) On the main shaft (6) (Fig. 1) of the sewing machine, a pulse disk (100) is attached, which has two pulse tracks, each of which works with a pulse generator (101 or 102).
- the one pulse path has a large number of pulse markings (103) (FIG. 5) distributed over its circumference, while the other pulse path has only two pulse markings (104), one of which has the pulse generator (101) when the needle () 13) from the workpiece and the other passes it when the needle (13) enters the workpiece.
- the pulse generator (101) is connected to a control unit (105).
- a switchover arrangement (106) is connected to this via a control line (106a), via control lines (107a, 108a and 109a) AND gates (107, 108 and 109), via a bus line (110) counters (111, 112 and 113 ) connected.
- a control line (114), a display line (115a) and a display line (116a) and a data line (116a) are connected to the control unit (105) via a bus line (114a).
- the outputs of the counters (111, 112 and 113) are connected to inputs of power stages (117, 118 and 119) for the associated stepper motors (23, 42 and 96).
- the outputs of the counters (111, 112 and 113) are connected to the control unit (105) via lines (purple, 112a and 113a). Lines (117a, 118a and 119a) lead from the control unit (105) to the power stages (117, 118 and 119).
- Three switches (120, 121 and 122) are also connected to the control unit (105), of which the switch (120) is used to actuate a reverse sewing process, while the two switches (121 and 122) are used to slowly drive the stepper motors (42 and 36) is preferably provided in the forward or backward direction when the sewing machine is at a standstill in the needle raised position.
- an oscillator (123) is connected to the two power stages (118 and 119) via a divider (124) and a switch (125).
- the switch (125) is connected to the control unit (105) via a control line (125a).
- the oscillator (123) is also connected to the input (E1) of the switching arrangement (106), the input (E2) of which is connected to the pulse generator (102).
- the output of the switching arrangement (106) leads to the inputs (E1) of the three AND gates (107, 108 and 109), the outputs of which are each connected to the associated counter (111, 112 and 113), which are designed as a down counter and which can be individually preset by the control unit (105) via the collecting line (110).
- the measure of the preselected stitch length is shown in each case in the display unit (115).
- a switch (126) is connected to the control unit (105) and is used to switch from the "moving needle” mode to the "fixed needle” mode and vice versa.
- a counter (127) can be provided, which is connected to the control unit (105) via a bus line (127a) and a line (127b) and a line (127c) to both the pulse generator (101) and the control unit ( 105) is connected.
- FIG. 6 shows schematically the distances traveled by the needle (13) during stitch formation and the movement of the sewing material caused by the pusher wheel (46) and the roller foot (80) for a predetermined stitch length (S).
- the needle When the needle is advanced, the needle (13) sticks into the sewing material at a puncture point (Pl), moves with it over its center line (M) according to the distances (nl and n2) to the sewing point P2 out of the sewing material.
- the pusher wheel (46) and roller foot (80) also shift the sewing material by the same amount (distances r1 and r2).
- the needle (13) After the needle (13) has left the material to be sewn in point (P2), it moves back outside the material to be sewn (n3 and n4) to its point of penetration (Pl).
- the slide wheel (46) and roller foot (80) move the sewing material by two distances (r3 and r4).
- the operator sets the desired feed amounts of the needle (13), the pusher wheel (47) and the roller presser (80) via the keypad (114), the corresponding digital values being taken from the data memory (116) via the control unit (105) and thus the counter (111, 112 and 113) can be preset. At the same time, values corresponding to the feed amounts are displayed in the display unit (115).
- the sewing motor (8) drives the main shaft (6) via the V-belt (7), which moves the needle bar (14) up and down via the drive connection - crank (11) and handlebar (12).
- the main shaft (6) also drives the gripper (not shown) via the toothed belt (9) and the gripper drive shaft (10).
- the drive for advancing the workpiece is always triggered via the pulse generator (101) when the needle (13) penetrates into the workpiece and when this is left.
- the pulse generator (101) gives a pulse to the
- Control unit (105) This now switches the potential at the inputs (E2) of the AND gates (107, 108 and 109) to (H) via the control lines (107a, 108a and 109a) so that the pulses subsequently emitted by the pulse generator (102) in the drive of the sewing machine to the input (E2) switched switching arrangement (106) from the AND-Gli ⁇ d ⁇ rn (107, 108 and 109) are passed to the counter (111, 112 and 113).
- the control unit (105) retrieves the corresponding values from the data memory (116).
- control lines (117a, 118a and 119a) connected to the power stages (117, 118 and 119) to determine whether the respective stepper motor (23, 42 and 96) is moved in the forward or reverse direction of rotation.
- the values which can be preset on the counters (111, 112 and 113) are selected so that the stepping motors (23, 42 and 96) can carry out their maximum number of steps both in the pierced phase of the needle (13) and in their pierced phase .
- step impulses acting on the stepper motors (23, 42 and 96) drive the oscillation (17), the slide wheel (47) and the roller foot (80) for the joint transport effect on the workpiece.
- Stepper motor (42) via the standing shaft (38) coupled with its output shaft (43) and the angular gear (45) the pusher wheel (47), while the stepper motor (80) simultaneously via the fixed with its output shaft ( 95) coupled shaft (90) and the Winkelgetri ⁇ b ⁇ (83) drives the roller foot (80).
- the stepper motor (23) simultaneously rotates the eccentric (21) step by step via its output shaft (22) in one direction, its eccentricity being deflected by the eccentric rod (20) and the
- Lever arm (18) on the rocker (17) transmitted, which thereby swings out by appropriate angular amounts. This takes place when the needle (13) is pierced in the workpiece in synchronism with the feed of the pushing wheel (47) and the roller foot (80) and in the pierced state of the needle (13) by driving the eccentric (21) in the opposite direction.
- the needle bar (14) performs a sinusoidal oscillating movement in the feed direction During its pierced phase in the workpiece, it vibrates in the feed direction and during the pierced phase, it vibrates in the opposite direction.
- the control of the stepping motor (23) for swinging out the needle bar (14) is designed so that it is
- Step motor (23) ischen the step motor (23) in V ⁇ rs and the other
- the drive of the stepping motors (42 and 96) for the sliding wheel (47) and the caster (80) is advantageously not carried out as a constant step sequence, but in two sinusoidal partial step sequences.
- the changeover from the "moving needle” operating mode to the "fixed needle” operating mode takes place by operating the switch (126) in its closed state. Dab ⁇ i controls the control unit (105) when the next pulse from the pulse generator (101) occurs when the needle (13) emerges (see also FIGS. 6 and 7) from the workpiece at the cut-out point (P2) the switching operation. This then runs in the cut phase the needle (13).
- the needle (13) is moved back into its central position M in the direction of the feed (V) (distance n3). Since the needle (13) normally only executes half the stitch length (S) during its pierced phase (distances n1 and n2), this movement is a quarter of the stitch length (S).
- the sliding wheel (47) and roller foot (80) have to move the sewing material in the first part of their feed (distance r1) to the center line M and in the second part of their feed (distance r2) only by 1/4 of the stitch length S from the center line M have now carried out the remaining amount in the cut-out phase of the needle (13), namely three quarters of the stitch length (S) (stretches r3, r4 and rl) to complete the started stitch.
- the corresponding data values for the movement of the needle (13), the pusher wheel (47) and the roller foot (80) are calculated from the entered stitch length (S) by the control unit (105) and when the stitch is carried out in the counter (111, 112 and 113) entered.
- the needle (13) no data values are entered into the counter (111).
- the counters (112 and 113) are also none during the pierced phase of the needle (13)
- the pusher wheel (47) and roller foot (80) are thus involved ⁇ i ⁇ g ⁇ stoch ⁇ ner needle (13) silent, while with the needle (13) stuck out they have to cover the entire feed amount to be carried out for one stitch length.
- the changeover switch (126) is switched back to its open position ... the next time the pulse from the pulse generator (101) occurs when the needle (13 ) from the sewing material in the central position (M), the control unit (105) controls the needle (13) from its central position M back by a quarter of the stitch length (S) ⁇ ntg ⁇ g ⁇ n d ⁇ r sewing direction to the injection point (Pl).
- the pusher wheel (47) and roller foot (80) transport the sewing material by three quarters of the stitch length (S) in the sewing direction, namely by the distances (r2, r3 and r4), so that the needle (13) in the next stitch is exactly at a distance from one another Stitch length (S) from the previous stitch at the puncture point (Pl).
- the control unit (105) controls the control sequence of the movement of the needle (13), pusher wheel (47) and roller foot (described above in the operating mode "accompanying needle"). 80).
- the changeover of the operating modes can also be controlled by the presettable counter (127), for example at the start of a sewing operation.
- the counter (127) can be preset using the keyboard (114) to a certain amount which corresponds to the number of stitches during which the needle bar guide (17) is to be stopped and during which the slide wheel (47) and the Roller foot (80) should take over the feed of the sewing material alone. This The amount can then be transferred to the counter (127) by the control unit (105) via the collecting line (127a) before each sewing operation.
- the counter (127) is counted down by "1" each time the needle (13) emerges from the sewing material via the pulse emitted by the pulse generator (101). As soon as the counter (127) is at "0", the changeover to the "moving needle” mode takes place, which then proceeds in the manner described above.
- the switch (120) is actuated, whereby the control unit (105) at the start of a new pulse from the pulse generator (101) via the control lines (117a, 118a and 119a) at the power stages (117, 118 and 119) the direction of movement of the stepping motors (23, 42 and 96) in each case reverses, so that they drive the sliding wheel (47), the roller foot (80) and the needle bar (14) in the opposite direction as long as the actuation of the switch (120) stops.
- the step sequence of the step motors (23, 42 and 96) is carried out by calling up the corresponding values set in the keypad (114) from the data memory (116) in the manner described above.
- the control unit (105) switches the switching arrangement (106) to the input (E1), so that the pulses emitted by the oscillator (123) turn on the inputs (El) of the AND gates (107, 108 and * d 109) are created.
- clock pulses are thus given by the oscillator (123) to the inputs (El) of the AND gates (107, 108 and 109) instead of the clock pulses by the pulse generator (102).
- the control unit (105) switches off the AND gates (107, 108 and 109) via the control lines (107a, 108a and 109a).
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Description
Claims
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3815323 | 1988-05-05 | ||
| DE3815323 | 1988-05-05 | ||
| DE3908952 | 1989-03-18 | ||
| DE3908952A DE3908952A1 (de) | 1988-05-05 | 1989-03-18 | Naehmaschine mit nadeltransport |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0413699A1 true EP0413699A1 (de) | 1991-02-27 |
| EP0413699B1 EP0413699B1 (de) | 1992-12-09 |
Family
ID=25867797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89904043A Expired - Lifetime EP0413699B1 (de) | 1988-05-05 | 1989-04-01 | Nähmaschine mit nadeltransport |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0413699B1 (de) |
| JP (1) | JP2905528B2 (de) |
| KR (1) | KR900700677A (de) |
| DE (1) | DE3908952A1 (de) |
| ES (1) | ES2014078A6 (de) |
| WO (1) | WO1989010993A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019170707A (ja) * | 2018-03-28 | 2019-10-10 | ペガサスミシン製造株式会社 | ミシンの針棒駆動機構 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3516713C1 (de) * | 1985-05-09 | 1986-04-24 | Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern | Naehmaschine mit einer in einer Schwinge gelagerten Nadelstange |
| DE3516715C2 (de) * | 1985-05-09 | 1987-04-30 | Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern | Nähmaschine mit einer Vorschubeinrichtung |
-
1989
- 1989-03-18 DE DE3908952A patent/DE3908952A1/de active Granted
- 1989-04-01 WO PCT/EP1989/000353 patent/WO1989010993A1/de not_active Ceased
- 1989-04-01 KR KR1019890702499A patent/KR900700677A/ko active Granted
- 1989-04-01 EP EP89904043A patent/EP0413699B1/de not_active Expired - Lifetime
- 1989-04-01 JP JP1503731A patent/JP2905528B2/ja not_active Expired - Fee Related
- 1989-05-04 ES ES8901538A patent/ES2014078A6/es not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8910993A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3908952A1 (de) | 1989-11-30 |
| JPH04504958A (ja) | 1992-09-03 |
| JP2905528B2 (ja) | 1999-06-14 |
| KR900700677A (ko) | 1990-08-16 |
| EP0413699B1 (de) | 1992-12-09 |
| DE3908952C2 (de) | 1990-05-03 |
| ES2014078A6 (es) | 1990-06-16 |
| WO1989010993A1 (fr) | 1989-11-16 |
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