EP0009107A2 - Machine à coudre zig-zag pourvue d'un dispositif pour l'obtention de points décoratifs - Google Patents

Machine à coudre zig-zag pourvue d'un dispositif pour l'obtention de points décoratifs Download PDF

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Publication number
EP0009107A2
EP0009107A2 EP79102828A EP79102828A EP0009107A2 EP 0009107 A2 EP0009107 A2 EP 0009107A2 EP 79102828 A EP79102828 A EP 79102828A EP 79102828 A EP79102828 A EP 79102828A EP 0009107 A2 EP0009107 A2 EP 0009107A2
Authority
EP
European Patent Office
Prior art keywords
sewing machine
control
zigzag sewing
actuator
spring
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
Application number
EP79102828A
Other languages
German (de)
English (en)
Other versions
EP0009107A3 (en
EP0009107B1 (fr
Inventor
Willi Meier
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.)
Dorina Nahmaschinen GmbH
Original Assignee
Dorina Nahmaschinen 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 claimed from DE19782839963 external-priority patent/DE2839963C2/de
Priority claimed from DE19782840209 external-priority patent/DE2840209C2/de
Application filed by Dorina Nahmaschinen GmbH filed Critical Dorina Nahmaschinen GmbH
Publication of EP0009107A2 publication Critical patent/EP0009107A2/fr
Publication of EP0009107A3 publication Critical patent/EP0009107A3/xx
Application granted granted Critical
Publication of EP0009107B1 publication Critical patent/EP0009107B1/fr
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B19/00—Programme-controlled sewing machines
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/22—Work-feeding means with means for setting length of stitch

Definitions

  • the invention relates to a zigzag sewing machine according to the preamble of claim 1.
  • control cams and the associated scanning and selection device are stored in the upper arm (DE-PS 1 043 044) or in the stand (DE-AS 1 011 263) of the machine, since most of the space there for the right extensive aggregate is available.
  • the center of gravity of the machine is shifted even further from the base surface of the machine due to the large mass of cam and selection unit, so that undesirable vibrations result when the machine is in operation.
  • the control power causing the adjustment of the fabric slide and the needle bar pendulum must also be passed on via a deflecting linkage each. Since the actuating forces, in particular for holding the slider in its set position, are very large given the high thrust forces acting on it during its feed movement, the transmission elements between the slider and the control cams must be designed to be stable. As a result of the large mass forces at a distance from the center of gravity of the machine, undesirable vibrations occur at high speeds. It also arises from in the transmission joints, there is a high total bearing clearance which affects the exact control positions of the adjusting device for the material slide.
  • the invention is intended to avoid these disadvantages and to provide a feed and / or top-stitch control unit which is simple in terms of manufacture and inexpensive to install, in which the control cams and the selection unit can be accommodated in the region of the center of gravity of the machine.
  • This object is achieved in a zigzag sewing machine according to the preamble of claim 1 by the features specified in the characterizing part of this claim. This measure results in a shift of the center of gravity towards the stand area and thus an improvement in the stability of the machine.
  • control cams and the selection device are expediently mounted on a common carrier.
  • the passage openings for the operating elements designed as push buttons are advantageously arranged on the top of the widened base.
  • the pressure on the buttons acts in the direction of the base of the machine, so that a tilting moment on the machine is avoided, as inevitably arises when the previously known push buttons arranged on the front of the upper arm are actuated.
  • the view of the pushbuttons is fully retained in this arrangement.
  • this is designed according to the characterizing part of claim 4.
  • This also enables the actuator to be arranged in the immediate vicinity of the actuating device for the feed size and direction and thus accommodates the control unit in the lower part of the machine, as a result of which the transmission linkage between the control unit and this actuating device, which is otherwise necessary due to the great effort required in a stable design, is eliminated .
  • the transmission linkage to the needle bar pendulum must then be extended; it can then remain small in its mass, because the effort to move the needle bar pendulum is very low.
  • the spring length is changed substantially less when the adjusting device for the feed size and direction is adjusted, as in the known arrangements in which the one spring end is attached to the housing of the sewing machine. It is therefore possible to manufacture sewing machine designs which can carry out longer stitch lengths without substantially increasing the force which the operator has to exert to switch over to the reverse stitch.
  • a restoring force for the actuating lever on the reverse stitch which is constant in all movement positions of the adjusting device for the feed size and direction, is achieved by the feature specified in the characterizing part of patent claim 7.
  • the sewing machine shown in FIG. 1 has an upper arm 1, which is connected to a base 3 via a stand 2.
  • the base 3 is supported by a base plate 4 and is widened towards the front relative to the stand 2 and the upper arm 1. It is equipped with a fabric support arm 5 which is displaced rearward with respect to the central axis of the base 3 and in which the lower stitch-forming tools, in particular the gripper of the sewing machine, are mounted.
  • a main shaft 6 (FIG. 2) mounted in the upper arm 1 of the machine drives a lower shaft 10 via a toothed wheel 7, a toothed belt 8 and a toothed wheel 9 (FIG. 3), which serves to drive the gripper in a known manner, not shown.
  • a carrier 11 is fastened with screws 12.
  • an axle 13 is fastened in two bearings, on which a block 14 is loosely mounted, which consists of a series of control cams 15 arranged one behind the other and a gear 16 arranged in front of it. This is in engagement with a gear 17 fastened on the shaft 10.
  • the reduction ratio between the gear 17 and the gear 16 is 6: 1.
  • An adjusting crank 18 is rotatably mounted on the end of the axis 13 and is firmly connected to a gear segment 19.
  • the control crank 18 is guided axially by a retaining ring 20 fastened in an annular groove in the axis 13.
  • the gear segment 19 is in engagement with a second gear segment 21, which is fastened on an angle lever 22, which is mounted on an axle bolt 23 fastened in the carrier 11 and carries a stop 24.
  • the adjusting disk 25 is rotatably mounted about a collar screw 28 fastened to the carrier 11.
  • the lever arm 22 carrying the stop 24 has an engagement point 29 in which one end of a spring 30 is suspended, the other end of which is suspended in an engagement point 31 on an arm of the gearwheel segment 19.
  • the two points of attack 29 and 31 are arranged on parts of the drive connection moving in the same direction.
  • the translation of the through the angle lever 22 and the gear segments 21 and 19 of the drive connection is chosen so that the point of engagement 31 arranged in the vicinity of the actuator 18 covers a greater distance in the joint movements than the point of engagement 29. Since the spring 30 is striving Taking its smallest extent, it therefore rotates the system so that the stop 24 bears against the inner positioning curve 26.
  • the amplification of the tensile force on the two points of attack 29 and 31 occurring during this rotation due to the extension of the spring 30 can essentially be eliminated if the position of the two points of attack 29 and 31 is selected such that the change caused by the displacement of the two lever arms the spring force is inversely proportional to the change in the spring force caused by the step-up ratio of the drive connection between the engagement points 29 and 31.
  • a selection device 32 is installed in the carrier 11 (FIG. 3).
  • a number of levers 34 corresponding to the number of control cams 15 is suspended on an axle 33 mounted in the carrier 11.
  • Each of these levers 34 is equipped with a locking arm 35 and an arm 36 projecting upwards.
  • an operating element 38 which projects through a corresponding passage opening 37 on the upper side of the base 3 and is designed as a push button, is attached.
  • a feeler lever 39 is rotatably mounted on each lever 34 and has two scanning lugs 40 and 41.
  • the levers 34 can each be latched in two positions by means of a latching rocker 42 which is pivotably mounted in the carrier 11.
  • their locking arms 35 each have a locking lug 43, which can snap into one of two corresponding recesses 44 on the locking rocker 42, which is pressed by means of a spring 45 against the locking lugs 43.
  • the levers 34 have lugs 46 against which leaf springs 47 which are fastened to the carrier 11 are supported.
  • the leaf springs 47 are equipped with stops 48 against which the raised levers 34 bear.
  • the scanning lugs 40 arranged on one side of the feeler levers 39 can interact with one of the control cams 15 arranged next to one another, while the sensing lugs 41 arranged on the other side of the feeler levers 39 abut against a vibrating frame 49 which is supported in the carrier 11 by means of an axis 50 is stored.
  • the swing frame 49 is connected to a pin 51, which is engaged by a pull rod 52 which is connected to a needle bar pendulum 55 via a deflection lever 53 (FIG. 2) articulated in the upper arm 1 and a connecting rod 54.
  • the needle bar pendulum 55 is articulated by means of a bolt 56 in the upper arm 1 and carries a vertically movable needle bar 57. This is firmly connected to a pin 58, on which a link 59 engages, which is articulated on a crank 60 fastened on the main shaft 6 .
  • An angle lever 61 is mounted on the axis 33 (FIG. 4). This carries a guide pin 62 which protrudes into a control groove 63 in the end face of the shim 25, which lies opposite the end face with the setting curves 26 and 27. Mounted on the angle lever 61 is a feeler lever 64 which has a scanning nose 66 pressing against a control cam 65 and a scanning nose 68 directed against a stop 67 which is fixedly connected to the gear segment 21. The control cam 65 is firmly connected to the gear 16, as shown in FIG. 5.
  • the actuator 18 (FIG. 5) is connected via a bolt 69 to a link 70 which is articulated by means of a bolt 71 to a further link 72.
  • An eccentric rod 73 engages on the bolt 71, which engages around an eccentric 74 mounted on the shaft 10.
  • the link 72 (FIG. 2) is connected to an arm of an angle lever 75, which is fastened on a shaft 76 mounted in the fabric support arm 5.
  • a second upstanding arm of the angle lever 75 has at its end a guide slot in which a pin 77 is guided.
  • This is attached to a support arm 78 which is on a horizon tal, in the fabric support arm 5 parallel to the feed direction axis 79 is slidably mounted.
  • the support arm 78 carries a fabric slide 80, the teeth of which act on the material to be sewn through slots in a needle plate 81.
  • the support arm 78 is supported on a lifting eccentric 82 which is attached to the shaft 10. is.
  • an upwardly projecting lever arm 83 is fastened, with which an arm 84 of an actuating lever 85 can interact to switch the feed direction to the reverse stitch.
  • the actuating lever 85 is mounted in the stand 2 of the machine and is pulled against an upper stop 87 by a spring 86 suspended on the stand 2 and on it.
  • the control curves 26 and 27 provided on the adjusting disk 25 are formed inversely to one another in an adjustment range a, i. H. the feed sizes that can be set in the forward and backward directions are the same size.
  • the inner positioning curve 26 is used to adjust the feed size in the feed direction, the stop 24 resting normally on it.
  • the positioning curve 27 is used to switch the feed device to the reverse stitch by moving the stop 24 on the curve.
  • control curves 26 and 27 are formed in an adjustment range b such that the feed variable can be changed from a minimum value to a maximum value with the control curve 26, while the control curve 26 lies outside the normal range of movement of the stop 24.
  • the operating elements 38 (FIG. 6) each carry two symbols 88, 89 from the sewing patterns, which can be selected after actuating the respective operating element 38. To distinguish between the two symbols 88, 89 located on an operating element 38, they can be designed in different colors.
  • the lifting movement of the fabric slide 80 is carried out by the lifting eccentric 82 attached to the shaft 10, the teeth of the fabric slide 80 rising above the surface of the needle plate 81 and engaging with the material to be sewn.
  • the feed step size of the material slide 80 is adjusted by adjusting the adjusting disc 25 (FIG. 4) when the stop 24 is within the adjustment range a of the control curves 26 and 27.
  • the stop 24 bears against the inner positioning curve 26 and, via the angle lever 22 and the two gearwheel segments 21 and 19, adjusts the actuator 18 with the bolt 69 serving as the axis of rotation for the handlebar 70 (FIGS. 3 and 5)
  • the link 70 therefore performs a pure rotary movement about the pin 69, whereas the link 72 also executes a relative movement about its articulation point on the angle lever 75 in addition to this rotary movement.
  • This relative movement is transmitted via the angle lever 75 to the support arm 78 as a sliding movement.
  • the switch of the fabric pusher 80 to the backward stitch takes place by depressing the actuating lever 85 (FIG. 4) against the pull of the spring 86.
  • the arm 84 pivots the lever arm 83 in FIG. 4 counterclockwise, so that the arm 84 connected gear segment 21 pivots the angle lever 22 until the stop 24 abuts the control curve 27.
  • the actuator 18 is pivoted by the gear segment 19 into its position intended for reverse sewing.
  • the swing-out range of the needle bar pendulum 55 is controlled by actuating one of the operating elements 38 (FIG. 3).
  • the associated lever 34 When an operating element 38 is depressed, the associated lever 34 is pivoted downward and its latching lug 43 snaps into the lower recess 44 of the latching rocker 42.
  • the locking rocker 42 swings out against the tension of the spring 45, a lever 34 previously locked in the recess 44 is pressed upward by the associated leaf spring 47 against the stop 48 which is designed to be resilient for noise reduction.
  • the detent 43 of the lever 34 lies freely in the upper recess 44.
  • the feeler lever 39 articulated on it is brought into contact with the associated control cam 15 and the oscillating frame 49.
  • the selected control curve 15 thus swings the oscillating frame 49 via the associated feeler lever 39, which swings out the needle bar pendulum 55 in accordance with the curve shape of the selected control curve 15 via the associated pin 51, the pull rod 52 and the connecting rod 54.
  • the sewing machine sews a sewing pattern that corresponds to the lower symbol 88 on the operating element 38 of the depressed lever 34.
  • the shim 25 pivots the angle lever 61 via the guide pin 62 engaging in its control groove 63, so that the feeler lever 64 with its nose 68 against the stop 67 of the gear segment 21 and with its nose 66 against the cam 65 on the gear 16.
  • the control curve 65 When driving the block 14, in addition to the selected control curve 15, which causes the lateral swing-out movement of the needle bar pendulum 55, the control curve 65 now controls the movement of the actuator 18 via the feeler lever 64, the stop 67 and the gear segments 21 and 19 in the manner already described influences the feed size and direction of the material slide 80.
  • the control cam 65 is designed in such a way that the fabric pusher 80 carries out two feed steps in the forward direction and one subsequent feed step in the reverse direction. With this combined control of the needle bar pendulum 55 and the fabric pusher 80, the sewing machine sews a sewing pattern that corresponds to the upper symbol 89 on the operating element 38 of the depressed lever 34.
  • the two basic colors of the symbols 88 are also used in the labeling of the setting disk 25 to select the two setting ranges a and b, so that it can be set to the desired one of the two symbols 88 or 89 of the selected operating element 38 without difficulty.
  • control cams 15 or some of them can also be used in a manner known per se instead of with the needle bar 57 with the adjusting crank 18 for controlling the feed movement of the material slide 80 by between the control cams 15 and the control crank 18 provided transmission means, which are formed analogously to the arrangement described between the control cams 15 and the swing frame 49.
  • the curve shape of these control curves 15 must then be adapted to the feed size and direction of the material slide 80 to be controlled.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP79102828A 1978-09-14 1979-08-06 Machine à coudre zig-zag pourvue d'un dispositif pour l'obtention de points décoratifs Expired EP0009107B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19782839963 DE2839963C2 (de) 1978-09-14 1978-09-14 Zierstichnähmaschine
DE2839963 1978-09-14
DE19782840209 DE2840209C2 (de) 1978-09-15 1978-09-15 Zickzacknähmaschine mit einer Mehrzahl koaxial auf einer Achse angeordneter Steuerkurven
DE2840209 1978-09-15

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP82100255.7 Division-Into 1982-01-15

Publications (3)

Publication Number Publication Date
EP0009107A2 true EP0009107A2 (fr) 1980-04-02
EP0009107A3 EP0009107A3 (en) 1980-06-25
EP0009107B1 EP0009107B1 (fr) 1984-06-13

Family

ID=25775718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79102828A Expired EP0009107B1 (fr) 1978-09-14 1979-08-06 Machine à coudre zig-zag pourvue d'un dispositif pour l'obtention de points décoratifs

Country Status (2)

Country Link
US (1) US4297956A (fr)
EP (1) EP0009107B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0194967A1 (fr) * 1985-02-07 1986-09-17 Fritz Gegauf Ag Bernina-Nähmaschinenfabrik Bobinoir de canette pour machine à coudre

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58200769A (ja) * 1982-05-20 1983-11-22 アイシン精機株式会社 ミシンの模様選択装置
US4441440A (en) * 1982-12-14 1984-04-10 The Singer Company Push-button control module for a sewing machine
US4442784A (en) * 1982-12-14 1984-04-17 The Singer Company Vertically stacked components in a control module for a sewing machine
US4612821A (en) * 1983-01-28 1986-09-23 The Singer Company Spring system for push-button control in a sewing machine
US4487141A (en) * 1984-05-29 1984-12-11 The Singer Company Force amplifying arrangement for sewing machine pushbutton control

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE575299C (de) * 1928-08-16 1933-04-26 Ignatz Gonyk Vorrichtung an Naehmaschinen zur Einstellung der Stichweite
US2822771A (en) * 1955-09-30 1958-02-11 Singer Mfg Co Sewing machines
US2854935A (en) * 1953-11-19 1958-10-07 Pfaff Ag G M Automatic shifting mechanism for sewing machines adapted for embroidery work
US2971482A (en) * 1955-06-02 1961-02-14 Nippon Sewing Machine Mfg Co L Automatic zigzag-stitch sewing machine
FR1260526A (fr) * 1959-06-24 1961-05-05 Flii Borletti Dispositif de déplacement du tissu dans les machines à coudre
US3105449A (en) * 1961-03-16 1963-10-01 Singer Co Zigzag actuating mechanism for sewing machines
US3156205A (en) * 1962-04-26 1964-11-10 Pfaff Ag G M Sewing machine mechanism for decorative stitching
US3357384A (en) * 1965-12-10 1967-12-12 Merrow Machine Co Feeding mechanism for sewing machine
US3468270A (en) * 1966-03-01 1969-09-23 Borletti Spa Sewing machine for straight or zigzag sewing
US3874312A (en) * 1974-01-23 1975-04-01 Singer Co Electric cam selector mechanism for sewing machines
DE2613033A1 (de) * 1975-03-28 1976-10-14 Brother Ind Ltd Elektrische naehmaschine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE548219A (fr) * 1955-10-29
US3279402A (en) * 1958-04-08 1966-10-18 Janome Sewing Machine Co Ltd Cam selecting arrangement for zig-zag stitch sewing machine
US3356051A (en) * 1963-10-28 1967-12-05 Janome Sewing Machine Co Ltd Cam selecting arrangment
US4066029A (en) * 1976-01-12 1978-01-03 The Singer Company Electromechanical remote cam selector for sewing machines
CA1091333A (fr) * 1976-08-06 1980-12-09 Yasukata Eguchi Machine a coudre avec selecteur des points de couture

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE575299C (de) * 1928-08-16 1933-04-26 Ignatz Gonyk Vorrichtung an Naehmaschinen zur Einstellung der Stichweite
US2854935A (en) * 1953-11-19 1958-10-07 Pfaff Ag G M Automatic shifting mechanism for sewing machines adapted for embroidery work
US2971482A (en) * 1955-06-02 1961-02-14 Nippon Sewing Machine Mfg Co L Automatic zigzag-stitch sewing machine
US2822771A (en) * 1955-09-30 1958-02-11 Singer Mfg Co Sewing machines
FR1260526A (fr) * 1959-06-24 1961-05-05 Flii Borletti Dispositif de déplacement du tissu dans les machines à coudre
US3105449A (en) * 1961-03-16 1963-10-01 Singer Co Zigzag actuating mechanism for sewing machines
US3156205A (en) * 1962-04-26 1964-11-10 Pfaff Ag G M Sewing machine mechanism for decorative stitching
US3357384A (en) * 1965-12-10 1967-12-12 Merrow Machine Co Feeding mechanism for sewing machine
US3468270A (en) * 1966-03-01 1969-09-23 Borletti Spa Sewing machine for straight or zigzag sewing
US3874312A (en) * 1974-01-23 1975-04-01 Singer Co Electric cam selector mechanism for sewing machines
DE2613033A1 (de) * 1975-03-28 1976-10-14 Brother Ind Ltd Elektrische naehmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0194967A1 (fr) * 1985-02-07 1986-09-17 Fritz Gegauf Ag Bernina-Nähmaschinenfabrik Bobinoir de canette pour machine à coudre
CH668445A5 (de) * 1985-02-07 1988-12-30 Gegauf Fritz Ag Spulvorrichtung fuer naehmaschine.

Also Published As

Publication number Publication date
US4297956A (en) 1981-11-03
EP0009107A3 (en) 1980-06-25
EP0009107B1 (fr) 1984-06-13

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