DEP0041981DA - Sewing machine with reversible direction of movement of the material slide - Google Patents

Description

Patent attorney Ernst Haigis

Fernsprether No. 1 ^ 92 WeMWtti Postscheck-Account ι Amt Mannover No. 68928 Bank-Komo. Commerz- und Prvval-Bank, Bielefeld

Bielefeld, April _{29, 19} 49

current act. 8053/49 Stapenhorststr. Iit

Current number

Dürkoppwerke Aktiengesellschaft, Bielefeld Nikolaus-Dürkopp-Str. 2. ^ tirh Sj ^ ejnbei ¹ Illl ^t Nalllllasolixne ^ l ?.

The present invention relates to sewing machines with a simple stitch length adjustment direction and to sewing machines in which the material feed can also be switched to forward or reverse sewing during sewing.

The first-mentioned sewing machines with simple stitch length adjustment devices are not configured to sew in reverse, as is required when darning and bartacking seams. at It is common in these machines that when darning or barring seams, i.e., when sewing in reverse, the presser foot becomes light lifted and the fabric is pulled back stitch by hand or the fabric is rotated 180 ° after each seam turned.

On sewing machines with a stitch regulator for forward and backward sewing, the stitch regulator hand lever (operating lever) is under spring pressure or under clamping, secured against unintentional adjustment. To overcome the peder pressure or the clamping, a greater effort is required when operating the stitch regulator or especially when switching to backward or forward sewing, which is perceived as particularly uncomfortable and annoying when doing such sewing work that requires frequent repositioning of the .1 require stitching device, e.g. when darning and locking seams.

By present invention it has become possible to provide both types vorbeschriebener types of machines with an additional device which allows a switching of the feeding device of the feed dog during de / 4 LauiWder engine at any speed, regardless of the stitch length one divider.

This goal is basically achieved by the fact that the feed eccentric of the stitch regulator is switched on from the start for the purpose of switching it on Reverse sewing or vice versa, is rotated by 18o ^ to the drive shaft by the additional Sinrichtung. Through this additional equipment, it has also become possible to improve the thread tension when sewing backwards by sewing for the Reverse stitch the feed number by turning the feed eccentric by a little more than 180 °, later or earlier to the needle entry lets come. Before explaining the present invention in detail, it should be said that it is not limited to the details of the construction and arrangement of the parts as shown and described in the accompanying drawing, for the The idea of the invention can also lead to the same goal by different arrangements of the parts and in different ways. It is also to understand that the terminology used here is not intended to be limiting, but only for the purpose of description serves, and it is not intended to limit the claims of the invention to the example presented.

The attached drawing shows the subject matter of the invention, for example. They show:

Fig.1 a sewing machine shown in partial vertical section and in front view with a device for Reversing the direction of movement of the fabric slider and a device> for adjusting the stitch length,

Fig · 2 the reversal of the direction of movement of the feeder serving control or. Switching elements in Connection with the Vursch ^ ü Dexcenter arranged on the main shaft in longitudinal section and on a larger scale and

Fig. 3 aie mi "* ^{1 c} ^ ^er main shaft connected control or switching elements in partial section to AB.

In order to be able to change the direction of movement of the fabric slide of a sewing machine so that it can be forward or backward as desired near, find special tax bezw within the meaning of the invention. Switching elements use that directly with the known feed eccentric h of the stitch device c are brought into connection. The present proposal includes the shaft carrying the feed eccentric h has a loose sliding bushing d and an adjustable but firmly seated guide body e, which is arranged next to the feed eccentric h provided with a driver f. The driver f is, for example. provided with a small spring f 'or a similar dampening means to reduce the beat when switching from forward to backward sewing to mitigate.

The sliding bushing d is displaceable in the axial direction on the shaft b and is ^{thereby guided against tangling by a bolt d 11} which passes through a slot in the sewing machine arm a. A stop bolt e 'engages with a groove over the ring shoulder d ″ of the sliding bush d, which is guided axially displaceably in the guide body e and is secured against rotation by a pin i. The stop pin e ¹ remains permanently in sliding engagement with the ring shoulder d '* when the shaft b rotates.

Bin second stop bolt e ^{! T} with guide pin i is around 180 ^c

offset radially to the stop bolt e ', also arranged axially displaceably in the guide body e and is connected to the stop bolt e ¹ by means of the embedded lever g which can be pivoted about the point e''' so that it can be reciprocally displaced in relation to one another. The pins i are guided displaceably in the axial direction ^{in the slide e 1 '''.} When the sliding bush d is pushed in one direction, the stop bolt e 'and in the other direction the stop bolt e * comes into the track of the driver f of the feed eccentric h, which can be loosely rotated on the shaft b.

By alternately switching the stop bolts e 'and e ^{, f} , the feed eccentric h remains at an angle of rotation of 180 ° while the machine is running. conversely changes.

A Bowden cable m, which is in a suitable manner in VerbMung with the sliding bushing d, is used to move the sliding bushing d, with a push button m 'or the like. can advantageously be located directly in the area of the sewing machine head. The already mentioned bolt d ^1,1 is firmly connected to an angle j and is normally held against the direction of the arrow in the end position by a compression spring 1, which is arranged between the angle j and a stop k adjustable in the axial direction on the sewing machine arm, so that the sewing machine is always set for forward sewing.

The actuation of the switching resp. Control organs are done by lightly pressing the pushbutton m 'of the Bowden cable or with a finger against the angle piece j, whereby the sliding bushing d shifted in the direction of the arrow and thereby the stop pin e 'into the track of the driver rs f brought and at the same time the stop bolt

e ' ^{1 is} pulled out of the path of the driver f. When the shaft b rotates, the feed eccentric h initially stops until its driver f is taken along ^{by the stop bolt e 1.} By turning the feed exc.enter h by 180 ⁰ to the shaft b, the machine is then switched to reverse sewing as long as the finger pressure against the angle piece j or against the push button m 'stops. The compression spring 1 is advantageously easily switched off or the angle j BEZW. the push button m ^{1 was} fixed by any suitable known device in order to enable continuous sewing in the reverse sewing position «

The conversion of a sewing machine of pre-reverse sewing can thus completely independent of a known stitch lengths - done adjusting, by the operation of a very easily operable push button o _# the like, which may be in close proximity of the sewing what uazB. is also of the greatest importance in the case of bolting and tamping work etc. to be carried out with the machine, in which only short stretches forwards or backwards often have to be worked alternately.

The organs effecting the controls are extremely simple in terms of their design and can be without Difficulty for other types of machines to redesign the described.

Claims (1)

Pattntane test: 1") Sewing machine ntt reversible Memegmgsriehtmg dee Stoffeehiebere and Slnriehtung XUM adjusting the Stiohlimge _t characterized by the Stoffaehiebera ₉ daae the control dee Before "or SUextraneportea independently eon the sttehläyigen ~ dure Sinatelletnrichtung _9?} Twisting dee Sttehstellerentriebaeseentere ml Sun ⁰ takes place" 2.) Wfmaaehtne noeh claim l, characterized by the fact that the control lever or button for the or control organs, which effect the sewing process, are expediently arranged in the Meretehe dee Mdhnaaehtnenxopfee is. 3 *) Mähmeehtne after aneprueh 1 and 2 ₉ through this getter * Xetehnet ₉ daae the tax bxw * schal torgene xwgekmgsetg and in the essential insist on one Ciner ^u Seidelle sliding Muehee (d) ₉ a guide body (e) eowte a driver (f) ₉ which laster in feater connection with a step plate entebeexeenter (h) rotatably mounted on the Mmptwelle Ioee » 4 ·) Mdhmaeehtne according to claim I He 5 # This is known as the ₉ daae the mf of the Mauptmtrtebmelle openable OMeitbuehee (d) with an anachlagbolxen (C) in stongrtff and the weehoelwetae Verehoelwetae Verehoelwetae the last and you etnea shorter anaehlagbolxena (e *) causes. 5. ) Mdhmaaehine according to claim 1 Hs A ₉ thereby gekem-Xetefewt ₉ that the Aneehlagbolxen (e * and e ") through a common, in the Guide body (e) weraehwenkbar stored Mebel (g) parallel xur Mmptwelle alternately displaceable are, 6th ) Mdhmeehtne according to claim 1 bta 5 » This means that Xetcmet ₉ daee the attachment bag (e * and e * ') Mittele etnea Sttftea (t) against twisting Imerholb the ate eufnefmenden ₉ tn the food body (e) eorgeaehene, canals are confessed. 7th ) Mdhmaeehtne according to claim 1 bts 6, through this XCiemet ₉ because the knife-gate valve actuated on Maektraneport comes back automatically into the counter-actuated Trenoportriehtung, 8m) Mähmeehtne according to claim 1 bts I ₉ thereby gekmn-XCtemet ₉ daee the return effymg of the tax bxw. Scarf torgene tn your starting point expedient under a warning Compression spring (X) happens between an angle piece attached to the sewing machine housing (k) and one over a Bolt (d "i) with the sliding bush Tied VtnkeXstUek (J) is included. 9 ·) Mhtaaehtne according to claim 1 to B ₉ characterized in that the compression spring (X) is arranged within the Mnkelattlcke ο .dgl * easily exchangeable in order to continue sewing in the forward or rack-forward sewing of the fabric after removing the same enable, 10.) Sewing machine according to claim 1 to 9 ₉ characterized » indicates that the actuation of the control or switching elements with the help of one in the area of the mower head built-in Bowden cable (m) takes place. 11.) Sewing machine according to claim 1 bts IO _9, characterized in that the mtnehner (f) of the Toraehubexeenter (h) with a damping agent, betspw. a spring (f) ο »like. Oersehen is ₉ to the beat when you see ixmffor- on back » sewing inwards.