EP0368869B1 - Nähmaschine mit einer obertransporteinrichtung - Google Patents

Nähmaschine mit einer obertransporteinrichtung Download PDF

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Publication number
EP0368869B1
EP0368869B1 EP88904400A EP88904400A EP0368869B1 EP 0368869 B1 EP0368869 B1 EP 0368869B1 EP 88904400 A EP88904400 A EP 88904400A EP 88904400 A EP88904400 A EP 88904400A EP 0368869 B1 EP0368869 B1 EP 0368869B1
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EP
European Patent Office
Prior art keywords
piston
foot
sewing machine
connection
sewing
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
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EP88904400A
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German (de)
English (en)
French (fr)
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EP0368869A1 (de
Inventor
Kurt Klundt
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GM Pfaff AG
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GM Pfaff AG
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
    • D05B27/04—Work-feeding means with feed dogs having horizontal and vertical movements arranged above the workpieces

Definitions

  • the invention relates to a sewing machine according to the preamble of claim 1.
  • the presser bar under the pressure of the presser spring is supported on an adjustable stop.
  • the presser feet, d. H. the presser foot and the upper feed foot have only a low mass inertia and are cushioned separately from the presser system so that at least one presser foot always has sufficient contact with the material.
  • a stroke regulation is known from the older DE-OS 35 28 295, in which a sensing element acting directly in front of the sewing point is provided, which senses the height difference and influences the control of the lifting drive with the sensed values.
  • the size of the stroke is adjusted accordingly and then reduced again to the original size. Due to the change in height of the support element carrying the sewing feet, the entire spring forces are also influenced. As the suspension ratios change, the sewing properties also change.
  • the invention has for its object to provide a height adjustment of the presser system for the presser foot and the upper feed foot which adapts to the respective thickness ratios of the sewing material.
  • the measure according to claim 2 enables the reaction forces acting on the sewing feet during the sewing process to be used as a controlled variable. Appropriate training of the controller to avoid excessive control fluctuations is achieved by the application according to claims 3 to 5.
  • the measures according to claims 6 to 9 serve to advantageously adapt the control system to differently designed upper transport systems. Claims 6 and 7 relate to an upper transport system in which the upper transport foot rests on the material during its entire drive phase, while claims 8 and 9 relate to an upper transport drive with an alternating lifting drive for the upper transport foot and the presser foot.
  • Fig. 1 shows the side view of a sewing machine, in the housing of a presser foot (1) carrying a presser foot (2) and a needle bar (4) mounted in a needle bar carrier (3), the thread-guiding needle (5) with a gripper, not shown, is received works together.
  • the sewing machine has an upper transport foot (6) which interacts with a lower fabric pusher, not shown.
  • a main shaft (7) (FIG. 2) which is driven in a known manner and which drives the needle bar (4) via a crank (8) and a link (9) is also mounted in the housing of the sewing machine.
  • the handlebar (9) is mounted on a pin (10) fastened in the crank (8).
  • An intermediate member (11) is also arranged on the pin (10) and is connected to a pin (12) which is rotatably mounted in the housing axially to the main shaft (7) and on which an eccentric (13) is fastened.
  • This is encompassed by an eccentric rod (14) which is connected to an angle lever (15) which consists of two lever arms (15a, 15b) which are fastened on a shaft (15c) mounted in an extension of the housing.
  • the lever arm (15b) of the angle lever (15) (Fig. 1) is connected via a link (16) to a pin (17) which is carried by a rocker (18). This is mounted on a pin (19) which is attached to a support element (20).
  • the support element (20) is attached to a piston rod (21) (Fig.
  • actuating piston (22) which is part of a gear connection (23).
  • a handlebar (28) (Fig. 1) is pivotally mounted, the other end of which is articulated to a support (29) for the upper feed foot (6).
  • the support element (20) also carries a pin (30) on which a telescopic rod (31) is mounted, which is also connected to the carrier (29) via a hinge pin (32).
  • the upper feed foot (6) is driven by a stitch actuator (40) (FIG. 2) which is connected to an eccentric (41) attached to the main shaft (7).
  • the stitch actuator (40) has an adjusting shaft (42) mounted in the housing, which is firmly connected to a bracket (43), between the arms of which a further bracket (44) is rotatably supported by pins (45).
  • the arms of the bracket (44) are connected by a bolt (46) to which an eccentric rod (47) is articulated.
  • the eccentric (41) which is enclosed by the eccentric rod (47), gives the bolt (46) oscillating movements around the pins (45).
  • a link (49) engaging on one end on the bolt (46) is articulated on the other end on a lever arm (51) which is attached to one end of an oscillating shaft (52) mounted in the housing parallel to the main shaft (7).
  • a lever arm (53) is connected to the other end of the oscillating shaft (52) and connects to it via a link (54) attacks a rocker arm (55).
  • This is attached to an oscillating shaft (56) (FIG. 1) mounted in the shoulder of the housing, which carries a further oscillating lever (57) which is connected to the pin (32) of the carrier (29) via a link (58) .
  • a lever arm (60) is attached to the adjusting shaft (42) (FIG. 2) of the stitch actuator (40) and is connected via a link (61) to a crank (63) attached to an adjusting shaft (62).
  • An adjusting crank (64) is clamped onto the adjusting shaft (62) mounted in the housing and is connected via an intermediate member (65) and a further adjusting crank (66) to an intermediate shaft (67) mounted in the housing.
  • a lever (68) is attached to this.
  • the lever (68) is connected via a ball pull rod (69) to one end of a rocking lever (70) which can be pivoted about an axis (71) fixed to the housing.
  • the still free end of the rocker arm (70) has a spherical projection (72) and projects into a positioning curve (73) of a lockable setting wheel (74) which is arranged on an axle (75) fixed to the housing.
  • the positioning curve (73) in the setting wheel (74) is so spiral to its axis (75) that stitch lengths of, for example, 1 to 6 mm can be set on the upper feed foot (6).
  • a spring (76) surrounding the intermediate shaft (67) and fastened at one end in the housing holds the shoulder (72) of the rocking lever (70) in constant contact with one of the side walls of the positioning curve (73).
  • the adjusting shaft (62) is connected to the lower slide valve, not shown, in a known manner, so that both when adjusting the adjusting wheel (74) the upper feed foot (6) and the lower fabric slide can be adjusted synchronously with each other.
  • the cylinder (24) (Fig. 1) of the follower (27) is equipped with a collar (80) which is fastened in the housing with a screw (81). It has an inner cylinder chamber (82) (Fig. 3) which is connected to a guide bore (83) in the collar (80).
  • the piston rod (21) of the actuating piston (22) is guided in the guide bore (83). This is slidably arranged in the cylinder chamber (82) and divides it into an upper and a lower chamber (82a, 82b).
  • the two chambers (82a) are formed by sealing rings (86) which are located in grooves (87) in the sealing bush (84) and by a sealing ring (89) inserted in a groove (88) in a pipe extension (80a) of the collar (80) ) and (82b) sealed up and down.
  • the two chambers (82a) and (82b) are filled with oil, which through a connection piece (90) fastened in the cylinder (24) via a bore (91) projecting into the lowermost part of the lower chamber (82a) from one with the Connection piece (90) connected, not shown supply container is supplied.
  • the connecting piece (90) has a one-way ball valve, so that in the event of oil leakage as a result of the negative pressure which arises when the adjusting piston (22) goes up, oil is automatically drawn in from the reservoir.
  • An annular groove (92) with a sealing ring (93) is provided in the circumference of the central part of the actuating piston (22).
  • a transverse bore (94a and 94b) is provided in the adjusting piston (22), which lie diagonally opposite one another and extends from the circumference of the adjusting piston (22) into an inner bore (95) in the piston rod (21) extend.
  • the bores (94a and 94b) are arranged so that they are open against the lower and the upper flange of the actuating piston (22).
  • the control bushing (25) mounted in the inner bore (95) of the piston rod (21) has an inner bore (96).
  • a transverse bore (97) into which a pin (98) protrudes, which is fastened in a lifting piece (99) and also penetrates a slot (100) in the piston rod (21).
  • the cross bore (97) is slightly larger in diameter than the diameter of the pin (98).
  • the lifting piece (99), which has a nose (101) projecting to the rear, is designed in the form of a cap and is slidably mounted on the piston rod (21). It is provided with an annular groove (102) which is open on one side and into which a clamping ring (103) clamped on the piston rod (21) is inserted.
  • the width of the annular groove (102) is larger than the width of the clamping ring (103).
  • the entire connection system (23) is pressed down by a leaf spring (104) arranged in the housing.
  • a control rod (111) is mounted in the inner bore (96) of the control bushing (25), the central part of which forms the follower piston (26). For this purpose, the part of the control rod (111) above and below the follower piston (26) is reduced in diameter. In its normal position, the follower piston (26) just covers the openings (106a and 106b) in the control bushing (25). Ring grooves (112 and 113) with sealing rings (114 and 115) are provided in the control rod (111) above and below the follower piston (26).
  • the control rod (111) projects downward into an axial bore (116) of the presser rod (2) guided in the lower part of the piston rod (21). Both rods (2 and 111) are connected to one another by a pin (110) which is fastened transversely in the presser bar (2) and projects through a slot (117) in the control bar (111). A hole (118) is provided in the presser bar (2), in which a compression spring (119) is received. This is supported against the lower end of the bore (118) and against the control bush (25).
  • annular flange (120) is clamped, in which a bore (121) is machined.
  • the end of a rod (123) fastened in a bore (122) in the support element (20) is slidably fitted therein.
  • On the free end of the rod (123) is one on the The presser bar (2) attached to the support lug (2a) is slidably guided.
  • This has a receiving bore (124) for a spring (125) which is supported against the end of the receiving bore (124) and against a reinforcing ring (126) on the rod (123).
  • the rod (123) is closed with a locking ring (127).
  • the two springs (119 and 125) form a measuring element for detecting the forces acting on the sewing feet (1 and 6).
  • a shaft (128) is mounted, which is firmly connected to a hand lever (129).
  • a cam segment (130) is fastened below the nose (101) of the lifting piece (99).
  • the telescopic rod (31) arranged between the support element (20) (FIGS. 4 and 5) and the carrier (29) for the upper transport foot (6) is divided into an upper fork (131) and a lower fork (132).
  • the lower fork (132) is connected to a bolt piece (133) and the upper fork (131) to a socket piece (134), which are pushed into each other and held together by a screw (135) screwed into the bolt piece (133).
  • a disc spring (136) is inserted between the head of the screw (135) and the upper fork (131) and a disc spring package (137) is inserted between the bushing piece (134) and the lower fork (132).
  • the preload of the plate spring assembly (137) can be changed by means of a nut (138) which is screwed onto the threaded bushing piece (134).
  • the feed size of the upper feed foot (6) (FIGS. 1 and 2) is adjusted by turning the setting wheel (74), whereby the positioning curve (73) rotates the intermediate shaft (67) via the rocker arm (70) accordingly.
  • the intermediate shaft (67) adjusts the adjusting shaft (62) via the intermediate member (65) and the adjusting shaft (42) via the link (61) and the lever arm (60). This arrangement ensures that when the adjusting wheel (74) is adjusted, the feed setting of the upper feed foot (6) is changed synchronously with the feed setting of the lower fabric slide via the adjusting shaft (62).
  • the movement derived from the eccentric (41) is controlled via the drive connection - eccentric rod (47), bolt (46), handlebar (49), lever arm (51), rocker shaft (52), lever arm (53), handlebar (54), rocker arm ( 55 and 57), handlebar (58), pivot pin (32) and support (29) - transferred to the upper feed foot (6), which thereby executes a corresponding feed movement.
  • the movement which is derived from the intermediate member (11) driven eccentric (13), is synchronized with the feed movement of the upper transport foot (6) via the drive connection - eccentric rod (14), angle lever (15), intermediate member (16), pin (17 ) and lever (28) - on the carrier (29) and thus on the upper feed foot (6) as a lifting movement.
  • the top feed foot rises and falls in the correct rhythm with its feed movement.
  • the leaf spring (104) which has a flat characteristic curve, presses via the piston rod (21), the handlebar (31) and the carrier (29) onto the upper feed foot (6) seated on the material to be sewn.
  • the spring force acting from the leaf spring (104) is z. T. reduced during the pressing phase of the upper transport foot (6) by the reaction force of the Tallerfederbyte (137).
  • the upper transport foot (6) is pressed on via the pretension of the plate spring assembly (137) and can be adapted to the desired transport behavior by adjusting the nut (138).
  • the contact spring of the top feed foot (6) is also dampened by the disc spring assembly (137).
  • the sprung handlebar (31) pushes the carrier (20) upwards, as a result of which the piston rod (21) also wants to slide upwards.
  • the leaf spring (104) acts on the carrier (20) with a predetermined force via the lifting piece (99), the clamping ring (103) and the piston rod (21). From this, the force is transmitted to one or both sewing feet (upper feed foot 6 and presser foot 1) depending on the swing position of the rocker (18).
  • the two springs (spring assembly 137 and spring 125) serve as working springs. They are pressed together individually or both together and pressed the sewing feet onto the material with a given pressure.
  • the plate spring (136) serves to reduce rebound impacts due to the mass of the upper feed foot (6) at the start of its lifting process.
  • the presser foot (1) itself does not stand out from the sewing material when the sewing machine is in operation.
  • the telescopic rod (31) shortens during the work process while increasing the spring tension of the plate spring assembly (137) and returns to its original length when the load is released.
  • the plate spring assembly (137) thus takes up the remaining stroke as well as the stroke movement of the lower fabric slide above the needle plate after the upper feed foot (6) has been placed on the sewing material.
  • the spring (125) has a steep characteristic. It therefore reacts very quickly when the material to be thickened, its change in force is relatively large and therefore also has a favorable effect on the pressure conditions on the adjusting piston (22). Due to its steep spring characteristic, the travel of the spring (125) can only be small.
  • the compression spring (119) is therefore arranged parallel to it with a flat characteristic. Their spring force normally adds to the spring force of the spring (125). Once this, e.g. B. when lifting the two feet (1 and 6) completely relieved by operating the hand lever (129) and thus becomes ineffective, the compression spring (119) presses the presser bar (2) down and thus guarantees the maintenance of the function of the follower piston (26).
  • the adjusting piston (22) can yield to the reaction force from below and also pushes itself upwards until the reaction forces acting on the two rods (2 and 21) have returned to their normal strength and the springs (137, 125 and 119) the push rod (2) in relation to the piston rod (21) has returned to its normal position.
  • the hand lever (129) is pivoted upwards.
  • the curve segment (130) thereby pushes the nose (101) of the lifting piece (99) upwards, which takes the control bushing (25) with it so far that there is between the follower piston (26) and the openings (106a and 106b ) forms a narrow gap.
  • the cylinder chambers (82a and 82b) are connected to one another in the manner described above and an oil exchange can take place.
  • the sewing feet are lowered by pivoting the hand lever (129) downwards, which releases the cam segment (130) of the lifting piece (99).
  • the leaf spring (104) can now press the control bushing (25) down, whereby the two cylinder chambers (82a and 82b) remain connected to each other, since the presser bar (2) initially remains in the lower position due to the compression spring (119).
  • the adjusting piston (22) is then pushed downward by the pressure also exerted on it until the connection between the two cylinder chambers (82a and 82b) is separated again.
  • the top transport device and its connection to the hydraulic controller are opposite greatly modified in the first embodiment. Essentially only the modified version is shown. Elements which correspond to the exemplary embodiment described are provided with the same reference symbols. As far as similar parts are concerned, they are provided with an apostrophe.
  • a pin (154) of a carrier (155) is fastened in the hollow end of the presser bar (2 ') which has a bearing eye (156) for receiving a presser foot (1').
  • This is pivotally mounted in the bearing eye (156) and has an annular plate (157) which engages around a downward-pointing pin (158) which is fastened to the carrier (155) and extends coaxially to the pin (154).
  • the ring plate (157) is braced by a compression spring (159) arranged on the pin (158) and by a plate spring (161) supported against a locking washer (160) on the end of the pin (158).
  • the presser bar (2 ') With its upper end, the presser bar (2 ') is connected in an articulated manner to a triangular lever (163) via a joint plate (162).
  • This has a bore (166) in which a rod part (167) is guided.
  • an upper feed foot (6 ') is attached.
  • the rod part (167) is with one Provide elongated hole (168) through which a pin (169), which is fastened transversely in the upper transport rod (165), extends.
  • a pin (170) connected to it in the axial extension of the rod part (167) is guided in an inner set (171) of the bore (166).
  • a spring (172) is mounted on the pin (170) between the rod part (167) and the inner shoulder (171).
  • a second spring (173) is arranged between the inner shoulder (171) and a screw (174) screwed into the upper end of the pin (170).
  • the springs (172 and 173) hold the upper feed foot (6 ') in a predetermined central position.
  • the triangular lever (163) is connected via a hinge pin (175) to an arm (176) which is mounted on a pin (177) fastened in the housing.
  • the up and down movement of the presser foot (1 ') and the upper feed foot (6') are generated by an eccentric (13 ') attached to the main shaft (7) (see also FIG. 7), which also has an eccentric rod (179) an arm (180a) of an angle lever (180) is connected.
  • This is mounted on a pin (181) fixed to the housing and its other arm (180b) is connected to the triangular lever (163) via a coupling (182) and a bearing pin (183).
  • the hinge pin (175) is connected to a pin (185) of a transmission rod (186) (FIG. 8) via a pair of plates (184), of which only the foremost plate can be seen.
  • This is part of a transmission connection (23 ') which has a follower regulator (27') consisting of a hydraulic cylinder (24 '), an actuating piston (22') and a follower piston (26), which is connected to the transmission rod (186) connected is.
  • the cylinder (24 ') is fixed in the housing of the sewing machine with a screw (187). It has an inner cylinder chamber (82) and is connected to a pipe section (188), the bore (189) of which is extended to the cylinder chamber (82). In the bore (189), the piston rod (21 ') of the actuating piston (22') is guided. This is displaceably arranged in the cylinder chamber (82) and divides it into the upper and the lower chamber (82a, 82b).
  • the bore (189) in the piston rod has internal threads in its upper part for screwing in the control bushing (25 ').
  • the upper part is provided with a corresponding external thread.
  • the control bushing (25 ') has an inner bore (191) which merges into a threaded bore (192) in the upper part.
  • a longitudinal slot (193) is also provided in the upper part of the control bushing (25 ') .
  • two connecting chambers (105a, 105b) formed by milling are provided, which are supplemented by rectangular openings (106a, 106b).
  • the control rod (111) projects downward from the control bushing (25 ') into an axial bore (195) in the lower part of the piston rod (21 ') guided transmission rod (186).
  • the two rods (186 and 111) are connected to one another by a pin (196) which is fastened transversely in the transmission rod (186) and projects through a slot (197) in the control rod (111).
  • a flange (198) is attached, on which one end of a compression spring (199) guided on the pipe section (188) rests, the other end of which is supported on the lower part of the cylinder (24') .
  • the transmission rod (186) is firmly connected to a shoulder (200) which is held at a distance from the flange (198) by a plate spring assembly (201).
  • the plate spring assembly (201) and the compression spring (199) hold the actuating piston (22 ') in the stationary state in a center position sprung up and down.
  • a screw (203) is adjustably attached to the extension (200) by two nuts (202), the shaft of which extends through a bore (204) in the flange (198).
  • a plate spring assembly (205) is provided on the shaft.
  • the height of the control bushing (25 ') is set so that the follower piston (26) just covers the openings (106a and 106b) in its sprung middle position.
  • the spring characteristic of the plate spring assemblies (201 and 205) can be changed by changing the position of the screw (203) relative to the shoulder (200). These serve as a measuring element for detecting the forces acting on the sewing feet (1 'and 6').
  • the torsional vibration of the triangular lever (163) generates the upward and downward movement of the two sewing feet (upper feed foot (6 ′) and presser foot (1 ′) and thus also their contact pressure on the material.
  • the contact pressure is determined by the pressure of the springs (159 and 172) of the two sewing feet and the pressure via the gear connection (23 '), as will be explained in more detail later.
  • the gear connection (23 ') acts with a force determined by the compression spring (199) via the pair of tabs (184) on the hinge pin (175) and thus also on the triangular lever (163). From this, the force is directed to one or both sewing feet (upper feed foot 6 'and presser foot 1') depending on the swing position of the triangular lever (163).
  • the two springs (159 and 172) serve as working springs. They are pressed together individually or both together and pressed the sewing feet onto the material with a given pressure.
  • the springs (161 and 173) are stop springs to avoid rebound impacts during the lifting process of the respective presser foot. When the sewing machine is in operation, an average of the impulsive reaction forces acting on the sewing feet is established.
  • the reaction forces on the sewing feet and therefore also on the springs (159, 172) change. This increases the force on the transmission rod (186) (Fig. 8) accordingly.
  • the springs (159 and 172) of the sewing feet (1 'and 6') are first pressed together, whereby the forces are transmitted to the transmission rod (186) via the movement mechanism.
  • the plate spring assembly (201) arranged between the initially blocked actuating piston (22 ') and the transmission rod (186) is compressed and thereby indirectly generates a control movement of the transmission rod (186) upwards.
  • the follower piston (26) is also pushed upwards and releases part of the openings (106a and 106b). Oil can now flow from the upper cylinder chamber (82a) via the bore (94a) in the actuating piston (22 ′), the connection chamber (105a), the two openings (106a and 106b), the connection chamber (105b) and the bore (94b) flow into the lower cylinder chamber (22b).
  • the adjusting piston (22 ') can yield to the reaction force from below and also pushes itself upwards until an approximate equilibrium of forces between the dynamic linkage force mean value from below and the static counterforce of the compression spring (199) has been established.
  • the plate spring assembly (205) is connected in parallel to the compression spring (199).
  • the two springs (199 and 205) are clamped together with the plate spring assembly (201) via the screw (203).
  • this spring system can also be subjected to tension, so that the frictional connection and thus also their mutual positive locking in the absence of reaction forces via the sewing feet (1 'and 6'), e.g. B. is not lost in the sudden transition to a lower substance level. This prevents noise and any tendency of the control system to oscillate.
  • the hand lever (128 ') is pivoted upwards.
  • the curve segment (129 ') thereby pushes the arm (176) upward, which also pushes the follower piston (26) upwards via the pair of plates (184) and the transmission rod (186).
  • the cylinder chambers (82a and 82b) are connected to one another in the manner described above and an oil exchange can take place. Due to the simultaneous via the spring assembly (201) on the piston rod (21 ') loading pressure, the actuating piston (22) in the cylinder chamber (82) moves up until it has reached the position determined by the end position of the arm (176) .
  • the sewing feet are lowered by pivoting the hand lever (128 ') down, whereby the curve segment (129') releases the arm (176).
  • the through the compression spring (199) formed bias can now push the transmission rod (186) with the follower piston (26) down, whereby the two cylinder chambers (82a and 82b) are connected to each other.
  • the adjusting piston (22 ') is then pushed down by the pressure exerted on the flange (198) until the connection between the two cylinder chambers (82a and 82b) is separated again.
  • FIG. 9 shows a shape of the stable piston and the control bushing which is modified compared to the configuration according to FIG. 8, in order to achieve a fine adjustment of the starting position of the hydraulic regulator.
  • the adjusting piston (22 ⁇ ) of the controller (27 ⁇ ) is provided with an annular groove (208) in which a sealing ring (209) is inserted.
  • the actuating piston (22 ⁇ ) is chamfered above and below the annular groove (208), so that inclined surfaces (210 and 211) are created, in which four upper and four lower bores (212 and 213) offset by 90 ° are provided, which extend outwards from the bore (189) in the actuating piston (22 nach).
  • the hole (189) has an annular groove (214 and 215) in the area of the holes (212 and 213).
  • the control bushing (25 ⁇ ) consists of a socket part (216) and a socket part (217), which are pushed into each other and glued together.
  • the socket part (217) two opposing milled portions (218a and 218b) are included, which the Cover the follower piston (26) straight in its middle position.
  • the socket part (216) has two diagonally opposed and mutually vertically offset milled portions (219a and 219b) such that one milled portion (219a) in the area of the annular groove (214) and the other milled area (219b) in the area of the annular groove (215) is arranged.
  • the cut (219a) is opposite an upper part of the cut (218a) and the cut (219b) is opposite a lower part of the cut (218b).
  • the average height of the follower piston (26) can be finely adjusted by simply turning the control bushing (25 ⁇ ).
  • the modification according to FIG. 11 differs from the arrangement according to FIG. 8 by an additional compression spring (210) between the control bushing (25 ') and the transmission rod (186) and by another spring connection in the lower part of the follower (27') .
  • a spring housing (211) is clamped on the piston rod (21 '), which receives a preloaded plate spring assembly (212). This is supported on the one hand against the spring housing (211) and on the other hand against a bushing (213) guided on the transmission rod (186) or a shoulder (214) of the transmission rod (186).
  • a locking ring (215) inserted in a groove in the spring housing (211) secures the position of the bushing (213).
  • the transmission rod (186) remains immobile.
  • the pressure of the reaction forces exerted by the sewing feet (1 'and 6') takes place via the shoulder (214) of the transmission rod (213) on the plate spring assembly (212) and is absorbed by the latter. Only when these forces acting from below exceed the preload of the plate spring assembly (212) can the transmission rod (186) move upwards and open the inflow to the two cylinder chambers (82a and 82b) in the manner described above in order to adjust the middle height of the sewing feet ( 1 ′ and 6 ′) to be adjusted.
  • the working range of the controller (27 ') lies during normal sewing within the pretension of the plate spring assembly (212), so that the control function of the controller (27') does not start in this area.
  • the control function of the controller (27') does not start in this area.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP88904400A 1987-07-27 1988-05-13 Nähmaschine mit einer obertransporteinrichtung Expired - Lifetime EP0368869B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3724786 1987-07-27
DE19873724786 DE3724786A1 (de) 1987-07-27 1987-07-27 Naehmaschine mit einer obertransporteinrichtung

Publications (2)

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EP0368869A1 EP0368869A1 (de) 1990-05-23
EP0368869B1 true EP0368869B1 (de) 1992-04-15

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EP88904400A Expired - Lifetime EP0368869B1 (de) 1987-07-27 1988-05-13 Nähmaschine mit einer obertransporteinrichtung

Country Status (6)

Country Link
EP (1) EP0368869B1 (enrdf_load_stackoverflow)
JP (1) JPH02504345A (enrdf_load_stackoverflow)
KR (1) KR890701824A (enrdf_load_stackoverflow)
DE (3) DE3724786A1 (enrdf_load_stackoverflow)
ES (1) ES2008505A6 (enrdf_load_stackoverflow)
WO (1) WO1989001067A1 (enrdf_load_stackoverflow)

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CN104652045A (zh) * 2015-02-09 2015-05-27 浙江乐江机械有限公司 一种缝纫机

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DE3724786A1 (de) * 1987-07-27 1989-02-16 Pfaff Ind Masch Naehmaschine mit einer obertransporteinrichtung
US5138962A (en) * 1989-01-27 1992-08-18 G. M. Pfaff Aktiengesellschaft Sewing machine with an upper feed mechanism
DE4230747C2 (de) * 1992-09-14 1994-08-11 Duerkopp Adler Ag Verfahren zum Betreiben einer Nähmaschine
DE19603294C1 (de) * 1996-01-30 1997-09-25 Duerkopp Adler Ag Nähmaschine mit Obertransportvorrichtung
IT1314415B1 (it) * 2000-06-23 2002-12-13 Vi Be Mac Spa Dispositivo per il controllo della pressione dei piedini premistoffaper macchine da cucire o simili.
US8683932B2 (en) 2007-08-30 2014-04-01 Vsm Group Ab Positioning of stitch data objects
WO2009061258A1 (en) 2007-11-09 2009-05-14 Vsm Group Ab Thread cut with variable thread consumption in a sewing machine
WO2009085005A1 (en) 2007-12-27 2009-07-09 Vsm Group Ab Sewing machine having a camera for forming images of a sewing area
CN102066639B (zh) 2008-06-26 2014-04-02 Vsm集团股份公司 机械操作的压脚提升装置及包括该装置的缝纫机
CN102041644B (zh) 2009-06-01 2014-09-17 Vsm集团股份公司 织构圈夹具
CN102459738B (zh) * 2009-06-11 2013-11-06 Vsm集团股份公司 用于缝纫机的上进料器
CN102277696B (zh) 2010-06-09 2015-03-11 Vsm集团股份公司 送料器移动补偿
DE102012207257B4 (de) * 2012-05-02 2014-01-16 Minerva Boskovice A.S. Nähmaschine
US8960112B2 (en) 2013-02-01 2015-02-24 Vsm Group Ab Stitching system and method for stitch stop embellishments
US9631304B2 (en) 2013-03-15 2017-04-25 Singer Sourcing Limited Llc Variable timing system of a sewing machine and method for selectively adjusting a timing of such a system
CN111411454B (zh) * 2020-04-26 2024-09-13 台州斯诺克电子科技有限公司 缝纫机上的外挂式送布辅助装置
US11946182B2 (en) * 2022-02-09 2024-04-02 Steven Marcangelo Sewing machine with adjustable stepping height and related methods

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DE7123663U (de) * 1971-09-23 Pfaff Industriemaschinen Gmbh Obertransportvorrichtung an einer Nähmaschine
JPS54150244A (en) * 1978-05-17 1979-11-26 Janome Sewing Machine Co Ltd Device for automatically adjusting cloth holdddown pressure on sewing machine
US4503794A (en) * 1982-09-16 1985-03-12 Yamato Mishin Seizo Kabushi Kaisha Upper feed dog automatic regulator for overlock machine
DE3528295A1 (de) * 1985-08-07 1987-02-19 Pfaff Ind Masch Naehmaschine mit einer abtastvorrichtung
JPS62189087A (ja) * 1986-02-15 1987-08-18 ブラザー工業株式会社 柄合わせ縫製を行うためのミシン
DE3724786A1 (de) * 1987-07-27 1989-02-16 Pfaff Ind Masch Naehmaschine mit einer obertransporteinrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104652045A (zh) * 2015-02-09 2015-05-27 浙江乐江机械有限公司 一种缝纫机

Also Published As

Publication number Publication date
JPH02504345A (ja) 1990-12-13
DE3870244D1 (de) 1992-05-21
DE3902443A1 (de) 1990-08-09
DE3724786A1 (de) 1989-02-16
WO1989001067A1 (en) 1989-02-09
KR890701824A (ko) 1989-12-21
DE3724786C2 (enrdf_load_stackoverflow) 1990-06-21
EP0368869A1 (de) 1990-05-23
ES2008505A6 (es) 1989-07-16

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