DE2130719B2 - FABRIC PRESSURE FOOT FOR SEWING MACHINES - Google Patents

Description

i π. 2 is a view corresponding to FIG. 1 "Triggering the locking of the presser foot

In the housing 1 of the sewing machine, the needle bar 3 equipped with the needle 2 is mounted and is driven in a known manner, not shown, via the connecting rod 4. Also in the case 1, a presser rod 5 is slidably mounted in a sleeve 6. The lower end of the presser bar carries a presser foot 7, while the upper end over a ball 8 one in A leaf spring 9 fixed in the housing 1 in a known manner acts. Through kaiotten-like depressions The position of the ball 8 is secured in the presser rod 5 and in the leaf spring 9.

On the presser bar 5, a lifting piece 10 is berestisit. its arm 11 in a vertical slot l ^ 'of the ~ housing is performed.

~ 1 · η Housing I a shaft 13 is mounted, which carries an eccentric pin 14 protruding from the inside! u'tv! on the outside of the housing 1 lying Ti a hand lever 15 is attached. An in the housing 1 j, r ^: BV.aichlung of Fig. 1 behind the slot 12, - 'cia-ertes rotating piece 16 rests with its lower V' / hlaeffläche 17 on the pin 14. while ',;, v upper stop surface 18 extends below \ - -nes 11.

The presser foot 7 has a support 19. ■ • ■ '"is screwed to the presser bar 5. V'- the lower part of the carrier 19 is a presser-the fabric slide 40 protrudes through Schlta £ 1 J ™ throat plate 42 and is carried by ^^^ 43. This is with her a-n r, inen pivot pin 44 an ^ J ^ gTber-

angdenkt who at emer die ^ Sch _; b Λ »^ _nd . ^ supporting sliding w . = Ie Λ6 * fej £ ^ ^ other end over a
Handlebar attacks 48, the
is attached. This is

ίο for "the knife 40

.5 end of de, StoiTschicbmtange 43 so that ■ £ * through di

_{Cucumber 49}

Lifting movement _H ebewelle 50

44 receives.

is guaranteed. lying teeth of the end of their whole 42 am of the fabric scincrn

., ^^ ΓαΓΚ ^ Τζ Mallei, to this ⁵ runs his hasty bearing merged described drive of the material dispatch. 4 cine low i "feed rate ar.tegnd ^ ra ^ stellur.2 will occupy. On this v> eise ₃ oNäh _S ut39 during transport through the

Teeth of the material slide 40 not closed ^. ^

movement around the

So a safer one
must the in de:
Fabric slide 40
Hubes above the
Sewing bag 39 angrei
slide 40.

11th

! .Τa compression spring 24 is arranged.

An arm 25 is formed on the carrier 19 1, ni a locking element by means of a pivot pin 26 27 «articulated, st. The locking element 27 has, non-cutout. the one through a baffle and a stop surface 29 is limited. The LeU : 1> che28 and the stop surface 29 can the W the swiveling ability of the presser foot

While 13
stuck on 16

_Pin 14 the rotating ■ its stop face _{KLK itself with Hcbestück}

J " _Su sugar tongs 5 and the

™ J u " _{bt the} lifting piece 10 can

lifts U ^ _βηη1βη . _not

^ is actuatable

\ nlaying surface30 for one that serves as a bolt131 Pin over that is between two fork arms c stretches the presser foot sole 20 to the rear

r £ en, caused by the spring 24i Pressure "of the bolt 31 on the system 30 caused a sufficiently strong re, bverb, idung. By a possible bevel of the plant surface this connection can still be improved.

A rotary joint mounted on the pivot pin 26 and acting on the arm 25 and the SpcrrcleScnt 27
against

ΛΑ7 ^{di Druckfcdcr24 to the}

nte 22 a. ^^ _StoficirücU , _rstangc

H;' Sch auflache 35 of the locking element dit obliquely. _{Spc rclcmcn} t 27 cnt-

d cn An '^ f ^ dcr 33 I pivoted ^ Dabci

_ei [surface 28 the bolt 31 and leads Le.tna ^ _n ^ _{cp dcr}

^ _e ^ _r ^ _Ucdcr 24 by the between the

MI and the Anlaecfläche 30 occurring Rcl 31 and ült .λ _{L. ntcrS} side of the handle

exercise gep err I id ha »^ _{uc 42} . _Di force

s 27 and the squad, 3, wants to

AUSSCnuusieiiuiiji. Ulm. L .... ,

trained inclined surface 35 acts with ι

hit 36 together, who has a r

bent arm 37 is attached to a holder 38 adjustably carried by the sleeve 6.

The presser foot sole 20 works to move ^ s of the near goods 39 with a so-called HüpTcrbewciiung executing knife gate valve 40 together, which forms the Veil of a conventional feed device.

Ii
Iu

lv-ut 39 can now under the pusher- ^ elcM and the StolTdrücKcrluB 7 m bc- ^; ^ _{h Zlirück} , _c lnvenken the hand

^N ^ _dt . _n . _{Should the} seam be on the

^ _must ^^, _v . _N " _hl

V,; _{c / cil! t} en way below the Solit; - ^ ^ _{pcr pressure of} the leaf spring

acts via the presser bar 5 on the presser foot sole 20. The force is via the hinge pin 21 transferred to the presser foot sole 20. As a result, a torque acts on the presser foot sole 20 around the stub edge 51 located below the needle 2 in FIG. 1. A corresponding tilting movement the presser foot sole 20 is by locking the Spcrrelemcntes 27 with the Latch 31 prevented. As a result, the sewing material 39 can be pushed through the push button 39 in the normal manner advance and does not have to be advanced against a presser foot sole 20 that would otherwise be inclined will.

As soon as the fabric edge 51 is behind the pivot axis of the presser foot sole determined by the hinge pin 21 20 is advanced, the torque acting on the presser foot sole 20 is omitted. the The presser foot sole 20 then lies parallel to the throat plate 42 or, when it is fed through the StolT slide 40, parallel to this on the material 3 * J. The inclination of the Stoflschieber 40 in his upper hand now causes such a pivoting of the pusher release sole 20 that the bolt 31 lifted from the contact surface 30 and there;

ίο locking element 27 under the action of torsion spring 33 is pivoted against the stop surface 34.

The presser foot sole 20 now corresponds to a normal articulated version with its known advantages for sewing sewing material with an irregular surface.

In addition 1 Elatt drawings

Claims (2)

1 2 The invention is based on the object of the claims: to design the locking between the support and the presser foot sole so that the when sewing starts at the 1. Presser foot for sewing machines with fabric edge locked pivoting of the presser foot Wearer, with an articulated sole self-connected with this 5 after a certain sewing progress Presser foot sole, with a first active lifts. Spring that the presser foot sole at her front of The solution to this problem is that the The part located at the sewing point pushes upwards. Stop from a pivotable on the carrier and with a locking element which is mounted to limit the pivoting movement and which counteracts the force ble stop, thereby marked-io a second spring with the presser foot sole net that the stop can be connected from a type of catch on the carrier, wherein the (19) pivotably mounted locking element (27) connection between the support and the presser foot sole exists, which only releases against the force of a second spring when the workpiece is so far below (33) with the presser foot sole (20) in the manner of the presser foot sole that a below which a catch (28, 30, 31) can be connected, whereby i ₅ workpiece-engaging agent via the workpiece the connection between carrier (19) and pressure a force on the sole of the foot (20) overcoming the first spring is only released when that exercises the presser foot sole. As a result, the seam of the workpiece can be so far below the presser foot sole directly on the edge of the material when it is more rigid (20) is that a presser foot sole can be started below the workpiece, with their attacking means (40, 42) over the workpiece 20 underside parallel or fas.t parallel to the throat plate a force overcoming the first spring (24) runs. The material to be sewn is because its edge is now effect on the presser foot sole (20). not pushed against an inclined surface who 2. Presser foot according to claim 1, characterized in that the must. from the knife gate valve in normal, characterized in that a stop fixed to the housing transported sufficiently. (36) into the motion path one at the upper end 25 when the throat plate that the box connection of the locking element (27) provided, the one between the carrier and presser foot sole releasing means locking of the locking element (27) forms, the dimensions of the locking elements are so too Inclined surface (35) protrudes. choose that the underside of the presser foot sole is in in the locked state assumes a snap position that rises minimally against the sole tip 30 and the catch catch the locking element in the horizontal position of the The presser foot sole just releases. The arrangement according to the invention can be particularly advantageous in cooperation with a The invention relates to a presser foot for 35 use the pressure valve in the course of his lifting sewing machines with a carrier, with an articulated movement above the throat plate a slight, in with this connected presser foot sole, with a direction of advance increasing inclination of a first Spring that takes the presser foot on its front. The presser foot sole can then be exactly in the part located at the sewing point pushes upwards. be locked in a horizontal position, whereby and with a 40 that can limit the pivoting movement, optimum transport conditions at the start of sewing Attack. result. Presser feet with swiveling presser foot soles In this case, the presser foot is released by being inclined Swiveling resulting in adjustment of the material slide advantageous for sewing sewing material applies, which irregularities in its thickness of the presser foot sole has the latching of the lock, because the articulated sole is a 45 element. even distribution of the pressure on the material to be sewn. But they are kerfuss sole and carrier takes place immediately after with the disadvantage that they hinder the transport of the sewing material edge to behind the axis of rotation of the sewing material when the seam on the presser foot sole is advanced when the stitch edge of the sewing material is to begin. Since the axis of rotation 50 plate or the material pusher, the presser foot sole is generally behind the stitch formation point over the workpiece and out of its blocking position, the sole takes - when it is pivoted. that it loosens the restraint.
The edge of the fabric at the start of sewing is in front of this axis of rotation. In order to automatically engage the locking mechanism, a sloping position and thus supports itself during close-up operation is achieved by a wedge-shaped protruding from the edge of the fabric. The stopper fixed to the housing in the movement path of a port at the beginning of the seam is then provided at the upper end of the locking element with great difficulty, or even stops completely in the case of thick sewing material. because the material pusher causing the locking element to be switched on only has a small part of its inclined surface, so that when the presser teeth are raised, the sewing material engages and this the inclined foot at the end of a sewing process focusses the rigid understanding presser foot sole when advancing against 60 bond between presser foot sole and carrier has to push up on the onerous spring pressure. is provided. Stitch accumulations or StolT- Fin can be used. The embodiment of the invention is shown in FIG Injuries caused by the stuffing valve in the sewing drawing are shown in more detail below machine does not handle. described. It shows This disadvantage wants the invention with simple G ₅ Fig. 1, the partial view of a sewing machine with the Avoid funds and create a presser foot. Side presser foot, partially cut in which the locked presser foot sole is at the start of the seam on the edge of a workpiece solves automatically. and