EP0134891B1 - Machine à coudre à cames-dessin - Google Patents

Machine à coudre à cames-dessin Download PDF

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Publication number
EP0134891B1
EP0134891B1 EP84105098A EP84105098A EP0134891B1 EP 0134891 B1 EP0134891 B1 EP 0134891B1 EP 84105098 A EP84105098 A EP 84105098A EP 84105098 A EP84105098 A EP 84105098A EP 0134891 B1 EP0134891 B1 EP 0134891B1
Authority
EP
European Patent Office
Prior art keywords
scanning
cam
adjusting means
sewing machine
finger
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
Application number
EP84105098A
Other languages
German (de)
English (en)
Other versions
EP0134891A1 (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
Application filed by Dorina Nahmaschinen GmbH filed Critical Dorina Nahmaschinen GmbH
Publication of EP0134891A1 publication Critical patent/EP0134891A1/fr
Application granted granted Critical
Publication of EP0134891B1 publication Critical patent/EP0134891B1/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

Definitions

  • the invention relates to a sewing machine according to the preamble of claim 1.
  • Such a sewing machine is known from DE-OS 14 10 543.
  • This machine has a cam package: which can be pushed onto and coupled to a drive shaft.
  • a manual control means is accommodated in a bearing fixed to the housing coaxially with the drive shaft.
  • the known arrangement is very complicated and therefore prone to failure and expensive to manufacture.
  • the object of the invention is to create a compactly designed unit which combines the cam arrangement and the adjusting device.
  • a compact unit results, which manages as an aggregate with few components and can be attached to the sewing machine housing in the simplest way. Since the scanning finger lies directly on the cam track aligned with it in relation to the cam disks, the cam disks can be made narrower because play is avoided by the transmission lever and the scanning finger always runs exactly opposite the cam disk set.
  • the measure according to claim 3 brings an extremely simple solution for executing straight stitch seams.
  • the sewing machine shown in FIG. 1 has an 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 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 mounted in the arm 1 drives a lower shaft 9 via a toothed wheel 7, a toothed belt 8 and a toothed wheel (not shown), which serves to drive the gripper in a known, not shown manner.
  • the main shaft 6 also drives a toothed belt 11 via a toothed wheel 10 and a toothed wheel 12 drives a shaft 13 mounted in the stator 2 in a ratio of 1: 1.
  • An axis 14 (FIGS. 3 and 4) is fastened in the base 3 of the sewing machine.
  • an adjusting means 15 is freely rotatably connected, which is firmly connected to a gear segment 15a.
  • the handlebar 17 is articulated via a bolt 18 to a further handlebar 19.
  • An eccentric rod 20 engages on the bolt 18 and engages around an eccentric 21 mounted on the shaft 9.
  • the link 19 (FIG. 2) is connected to an arm of an angle lever 22, which is fastened on a shaft 23 mounted in the fabric support arm 5.
  • a second upwardly projecting arm of the angle lever 22 has at its end a guide slot in which a pin 24 is guided.
  • This is attached to a support arm 25 which is slidably mounted on a horizontal axis 26 fixed in the fabric support arm 5 parallel to the feed direction.
  • the support arm 25 carries a fabric slide 27, the teeth of which act on the material to be sewn through slots in a needle plate 28.
  • the support arm 25 is supported on a lifting eccentric 29 which is fastened on the shaft 9.
  • the gear segment 15a (FIG. 3) is in engagement with a second gear segment 30, which is mounted on an axle 31 fastened in the socket 3 and carries a laterally projecting stop 32.
  • a three-armed lever 33 is mounted on the axis 31.
  • An arm 33a of the lever 33 interacts with the stop 32, a second arm 33b carries a pin 34 which projects between two control curves 37 and 38 formed on one end face of an adjusting disk 36.
  • the adjusting disc 36 is rotatably mounted about a collar screw 39 fastened to the base 3.
  • the arm 33b of the lever 33 has a bore 40 into which one end of a spring 41 is suspended, the other end of which is suspended in a recess 42 on the actuating means 15.
  • the bore 40 and the recess 42 are arranged on parts of the drive connection which move in the same direction.
  • the translation of the lever connection 33 and the gear segments 30 and 15a of the drive connection is selected such that the recess 42 arranged in the vicinity of the actuating means 15 covers a greater distance than the bore 40 during the joint movements. Since the spring 41 is endeavored Taking its smallest extent, it therefore rotates the system so that the pin 34 bears against the inner positioning curve 37.
  • the lever 33 has a third lever arm 33c projecting upwards, with which an arm 45a of an actuating lever 45 can interact to switch the feed direction to the reverse stitch.
  • the actuating lever 45 is mounted in the stand 2 of the sewing machine and is pulled against an upper stop 47 by a spring 46 suspended on the stand 2 and on it.
  • An angle lever 48 is mounted on the axis 31. This has a scanning lug 48a directed against the stop 32. The other end of the angle lever 48 is connected to a rod 50, which interacts via a deflection lever 51 (FIG. 2) mounted on the stand 2 and a pull rod 52 with an automatic unit 53 accommodated in the stand 2.
  • a further automatic unit 54 is provided in the stand 2 above the automatic unit 53 and is connected to a needle bar pendulum 58 via a pull rod 55, a double lever 56 mounted in the upper arm 1 and a connecting rod 57.
  • the needle bar pendulum 58 is articulated on a pin 59 in the arm 1 and carries a vertically movable needle bar 60. This is firmly connected to a pin 61, on which a link 62 engages, which is articulated to a crank 63 fastened on the main shaft 6 .
  • the two automatic units 53 and 54 are basically the same. It is therefore sufficient to describe the structure of only one of these units.
  • the automatic unit 54 has a carrier 64 (FIGS. 5 and 6) which is fastened to an extension 66 of the stand 2 by screws 65.
  • the screws 65 protrude through elongated holes 67 in the shoulder 66 in order to be able to adjustably fix the unit 54 parallel to the main shaft 6.
  • An axle 68 is fastened in the carrier 64, on which a cam block 70 carrying various types of cam profiles 69 is rotatably mounted together with a worm wheel 71 which is firmly connected thereto.
  • the worm wheel 71 is in engagement with a drive worm 72 fastened on the main shaft 6.
  • the cam block 70 is guided between the wall of the carrier 64 and a locking washer 73 fastened on the axis 68.
  • a further axis 74 is fastened on the carrier 64, on which a feeler lever 75 is rotatably and axially displaceably mounted.
  • a touching finger 76 which interacts with the curve profiles 69, is attached to this and carries a pushbutton 77 running perpendicular to its plane of movement.
  • the end of the feeler lever 75 opposite the feeler finger 76 is designed as a pair of teeth 78 which is in engagement with a tooth 79 of a rocker 80.
  • This is mounted on a third axle 81 fastened to the carrier 64 and carries a pivot pin 82 which is connected to the needle bar pendulum 58 via the pull rod 55 (FIG. 2), the double lever 56 and the connecting rod 57.
  • a manual actuating means 83 designed as a disc is mounted on the axis 68 and is pressed against a support disc 85 by a brake spring disc 84. This is held by a screw 86 screwed into the axis 68.
  • the support disk 85 has a radially resilient arm 87, the free end of which carries a pin 88 which interacts with catches 89 of an annular wall 90 of the manual actuating means 83. To adjust the manual control means 83, it protrudes through a slot 2a (FIG. 6) of the stand 2 of the sewing machine.
  • the hand-operated means 83 carries an annular wall 91 surrounding the cam block 70. This is formed in the axial direction of the hand-held means 83 as a spiral staircase-shaped curved path 92, which consists of steps 93 and transition bevels 94 connecting them.
  • the touch finger 76 rests on the steps 93 or the transition bevels 94 under the action of a spring 95 (FIG. 5) suspended between the touch lever 75 and the stand 2.
  • the wall 91 has switching cams 96, each of which has the length of a step 93 and a transition slope 94.
  • the switching cams 96 are used to temporarily lift the finger 76 from the cam block 70 by the key 77 when the manual control means 83 are rotated.
  • the control cams 96 are separated from one another by incisions 97, each of which is so deep that the key element is in the locked position of the manual control means 83 77 can move freely when rotating the cam block 70.
  • the range of rotation of the manual control means 83 is limited by end stops 98 (FIG. 8) which are connected to the wall 90 and which each abut on the pin 88.
  • the step 93a (FIG. 7) of the cam track 92 arranged at one end of the rotary range of the hand adjusting means 83 is dimensioned such that it holds the stylus finger 76 in a position lying laterally outside of the cam block 70.
  • the switching cam 96a assigned to this stage 93a has stop surfaces 99a, 99b and 99c against which the sensing element 77 rests and which determine the position of the tactile finger 76.
  • the manual setting means 83 is provided with identification letters (FIG. 1) A to H, which are assigned to the different latching positions and which can be set to a marking 100 on the stand 2.
  • the automatic unit 53 for controlling the feed movement of the fabric slide 27 is in principle identical to the structure of the automatic unit 54. It differs only in the shape of the curve profiles 69; in addition, the switching cam 96a has only the stop surface 99c, in which the feeler lever 75 is pivoted into the position in which the greatest possible advance is achieved.
  • the worm wheel 71 of the automatic unit 53 is engaged with the shaft 13.
  • the manual setting means 83 of the automatic unit 53 is provided with code letters M, N and 0 (FIG. 1), these can be set to a marking 101 on the stand 2. In position 0, the feeler lever 75 is located to the side of the cam block 70, i. H. the automatic function is switched off.
  • the lifting movement of the fabric slide 27 takes place through the lifting eccentric 29 fastened on the shaft 9, the teeth of the fabric slide 27 rising above the surface of the needle plate 28 and engaging with the material to be sewn.
  • the adjustment of the feed step size of the material slide 27 takes place when the automatic unit 53 is set to the identification letter 0 by adjusting the adjusting disk 36 (FIG. 3).
  • the pin 34 rests on the inner positioning curve 37 and, via the lever 33, the stop 32 and the two gearwheel segments 30 and 15a, adjusts the adjusting means 15 together with the axis of rotation for the handlebar 17 (see also FIG. 2 and 4) serving bolts 16.
  • the link 17 therefore performs a pure rotary movement around the pin 16, whereas the link 19 also executes a relative movement about its articulation point on the angle lever 22 in addition to this rotary movement .
  • This relative movement is transmitted via the angle lever 22 as a sliding movement to the support arm 25.
  • the switch of the fabric pusher 27 to the reverse stitch takes place by depressing the actuating lever 45 (FIG. 3) against the pull of the spring 46.
  • the arm 45 pivots the arm 33c of the lever 33 in FIG. 3 counterclockwise, so that its arm 33a pivots the gear segment 30 over the stop 32 until the pin 34 bears against the positioning curve 38.
  • the adjusting means 15 is pivoted by the gear segment 30 into its position intended for reverse sewing.
  • the swing-out width of the needle bar pendulum 58 is controlled by the automatic unit 54 (FIGS. 5 to 8).
  • the respective control program is set using the manual control means 83.
  • the feeler member 77 and thus also the feeler finger 76 is pivoted radially outward via one of the switching cams 96, so that the feeler finger 76 slides from the cam block 70 on the step 93 running parallel to the path of the straight curve profile 69 selected.
  • the manual control means 83 is turned further, the finger 76 is now slid along the corresponding transition slope 94 with the next cam profile 69, after which the switching cam 96 releases the button 77 again and the finger 76 rests on the cam profile 69 under the action of the spring 95.
  • the selected cam profile 69 thus swings the rocker arm 80 via the feeler lever 75. This swings the needle bar pendulum 58 over the articulated pin 82 connected thereto, the pull rod 55, the double lever 56 and the connecting rod 57 in accordance with the curve shape of the selected cam profile 69 .
  • the sewing machine sews a sewing pattern that corresponds to the symbol of the set identification letter on the hand setting means 83.
  • An automatic control of the fabric slide 27 takes place by turning the setting means 83 of the automatic unit 53 to a code letter that differs from 0.
  • the curve profile 69 selected thereby swings when the cam block 70 rotates via the feeler lever 75, the rocker arm 80. This then swings over the pull rod 52, the deflection lever 51, the rod 50, the angle lever 48 (FIG. 3) and the gear segment 30 the stitch regulator lever 15 in accordance with the curve shape of the selected curve profile 69.
  • the adjusting disk 36 In order to fully utilize the movement of the fabric slide 27 when the automatic unit 53 is switched on, the adjusting disk 36 must of course be set to the maximum feed length of the fabric slide 27.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Claims (3)

1. Machine à coudre avec une tige d'aiguille guidée verticalement dans une navette de tige d'aiguille, avec un moyen de commande pour commander la valeur d'avancement et le sens d'avancement d'une griffe d'entraînement de tissu et avec un bloc de cames de commande (70) monté sur un axe (68) et portant plusieurs profils de cames juxtaposés qui sont reliés par l'intermédiaire d'un mécanisme de palpage à la navette de tige d'aiguille ou au moyen de réglage de la griffe d'entraînement de tissu, le mécanisme de palpage présentant un doigt de palpage (76) qui peut être commuté sur les différents profils de cames par un moyen de commande manuelle et qui coopère par l'intermédiaire d'un organe de palpage avec des cames de commutation qui sont reliées fixement au moyen de commande manuelle et qui, lors de la commutation, le soulèvent tout d'abord à l'écart du bloc de cames de commande (70) à l'encontre de l'action d'un ressort, le déplacent par un transporteur curviligne (92) à la manière d'un escalier tournant relié fixement au moyen de commande manuelle (83), et enfin le ramènent en engagement avec le bloc de cames de commande (70), caractérisée en ce que le moyen de commande manuelle (83) est monté sur l'axe (68) portant le bloc de cames de commande (70), le transporteur curviligne (92) relié fixement au moyen de commande manuelle (83) entoure annu- lairement le bloc de cames de commande (70) afin d'aligner le doigt de palpage (76) avec le profil de came sélectionné, et le doigt de palpage (76) repose directement sur le transporteur curviligne (92).
2. Machine à coudre selon la revendication 1, caractérisée en ce que le transporteur curviligne (92) porte les cames de commutation (96) orientées dans le sens radial, qui coopèrent avec l'organe de palpage (77) relié au doigt de palpage (76).
3. Machine à coudre selon la revendication 1 ou 2, caractérisée en ce que le doigt de palpage (76) peut être déplacé par le transporteur curviligne (92) à une position située latéralement à l'extérieur du bloc de cames de commande (70), à laquelle l'organe de palpage (77) qui lui est relié s'appuie contre des faces de butée (99) en gradins d'une des cames de commutation (96a).
EP84105098A 1983-08-27 1984-05-05 Machine à coudre à cames-dessin Expired EP0134891B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3330928A DE3330928C2 (de) 1983-08-27 1983-08-27 Nähmaschine mit Stichmustersteuerung
DE3330928 1983-08-27

Publications (2)

Publication Number Publication Date
EP0134891A1 EP0134891A1 (fr) 1985-03-27
EP0134891B1 true EP0134891B1 (fr) 1987-07-08

Family

ID=6207587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84105098A Expired EP0134891B1 (fr) 1983-08-27 1984-05-05 Machine à coudre à cames-dessin

Country Status (5)

Country Link
US (1) US4548144A (fr)
EP (1) EP0134891B1 (fr)
JP (1) JPS6048782A (fr)
DE (2) DE3330928C2 (fr)
ES (1) ES8503047A1 (fr)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL246592A (fr) * 1959-06-13
GB1181606A (en) * 1968-05-21 1970-02-18 Singer Co Multiple Stitch Pattern Producing Mechanism.
US3807329A (en) * 1972-11-29 1974-04-30 Singer Co Integrated sewing machine controls
US3786769A (en) * 1973-02-05 1974-01-22 Singer Co Pattern selection system
US3795210A (en) * 1973-04-26 1974-03-05 Singer Co Cam selection module
JPS5221966A (en) * 1975-08-11 1977-02-18 Janome Sewing Machine Co Ltd Pattern can selector for sewing machine
CH594769A5 (fr) * 1976-03-16 1978-01-31 Mefina Sa
US4095540A (en) * 1977-02-28 1978-06-20 The Singer Company Sewing machine stitch regulating mechanisms
JPS6012072B2 (ja) * 1979-02-16 1985-03-29 蛇の目ミシン工業株式会社 ジクザグミシンにおける模様選択装置
JPS6022919Y2 (ja) * 1979-03-26 1985-07-08 蛇の目ミシン工業株式会社 ミシンの模様選択機構
JPS564274A (en) * 1979-06-25 1981-01-17 Fujitsu Ltd Semiconductor device
US4497267A (en) * 1984-03-19 1985-02-05 The Singer Company Low torque pattern selecting mechanism for a sewing machine

Also Published As

Publication number Publication date
DE3330928C2 (de) 1985-08-14
JPS6048782A (ja) 1985-03-16
ES533234A0 (es) 1985-02-01
JPS6361032B2 (fr) 1988-11-28
EP0134891A1 (fr) 1985-03-27
DE3464636D1 (en) 1987-08-13
US4548144A (en) 1985-10-22
ES8503047A1 (es) 1985-02-01
DE3330928A1 (de) 1985-03-21

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