EP0469188B1 - Blind stitch sewing machine - Google Patents

Blind stitch sewing machine Download PDF

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Publication number
EP0469188B1
EP0469188B1 EP90124188A EP90124188A EP0469188B1 EP 0469188 B1 EP0469188 B1 EP 0469188B1 EP 90124188 A EP90124188 A EP 90124188A EP 90124188 A EP90124188 A EP 90124188A EP 0469188 B1 EP0469188 B1 EP 0469188B1
Authority
EP
European Patent Office
Prior art keywords
fabric
drive shaft
blind
bulger
sewing machine
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
Application number
EP90124188A
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German (de)
French (fr)
Other versions
EP0469188A1 (en
Inventor
Rudolf Dietl
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.)
J Strobel & Sohne & Co GmbH
Original Assignee
J Strobel & Sohne & Co 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.)
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Publication date
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Publication of EP0469188A1 publication Critical patent/EP0469188A1/en
Application granted granted Critical
Publication of EP0469188B1 publication Critical patent/EP0469188B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B1/00—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both
    • D05B1/24—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making blind-stitch seams
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B85/00—Needles
    • D05B85/06—Curved needles

Definitions

  • the invention relates to a blind sewing machine specified in the preamble of claim 1.
  • the plate-shaped fabric flexor is pivotally mounted in the middle or at one end on its support and is loaded by a tension or compression spring away from the massive drive shaft for the fabric flexor, which is rotatably mounted in the fabric support arm of the blind sewing machine and when sewing in cycles the swinging bow needle of the blind sewing machine as well as the timed step-by-step feed feed swings back and forth.
  • the slot of the carrier running transversely to the drive shaft for receiving the fabric flexor with a slot width corresponding to the fabric flexor width is provided at that end of the support which projects perpendicularly from the drive shaft.
  • the tension spring engages on the one hand at one end of the fabric flexor and on the other hand on an arm of the carrier which also extends radially to the drive shaft in order to press the fabric flexor with a stop against the bottom of the slot in the carrier. From this position, the fabric flexor can pivot against the action of the tension spring, its other end moving away from the path of movement of the curved needle toward the drive shaft of the fabric flexor.
  • the compression spring is arranged in a longitudinal bore of the support and is supported on the one hand by an adjusting screw which can be screwed therein to change the pretension of the compression spring and on the other hand by a ball on the end of the fabric flexor remote from the pivot axis.
  • the carrier is provided with a stop pin, which extends transversely in the slot through an elongated hole of the fabric flexor, which is formed in a circular arc and is arranged concentrically to the pivot axis of the fabric flexor.
  • the compression spring presses the fabric flexor with the adjacent end of the elongated hole against the stop pin.
  • the fabric flexor can pivot against the action of the compression spring until the other end of its elongated hole rests on the stop pin, the compression spring end of the fabric flexer moving away from the path of movement of the curved needle toward the drive shaft of the fabric flexor.
  • the fabric flexor always pivots out of the first-mentioned position when a sewing material thickening between the fabric flexor and a stop on the stitch plate of the blind sewing machine, against which the fabric flexor bulges the material and which is spring-loaded on the material, counteracts the effect of the spring load to be able to dodge, to an extent that can be changed by means of an adjusting screw.
  • the two fabric flexors are each rod-shaped and can be moved axially back and forth by means of the associated drive shaft, each fabric flexor being resiliently mounted, specifically in a sleeve connected to the respective drive shaft, in which a compression spring loading the fabric flexor is arranged, the bias of which can be changed by means of an adjusting screw.
  • the drive shaft of one fabric flexor is hollow and rotatably mounted on the drive shaft of the other fabric flexor, which in turn is rotatably mounted in the fabric arm of the blind sewing machine.
  • the latter is spring-loaded in the sewing position for abutment against a stop, which is used to change the distance of the fabric support arm in the sewing position from the path of movement of the curved needle of the blind sewing machine and thus to adjust the penetration depth of the curved needle into the material bulged by the fabric flexors by means of an adjusting screw Linkage is adjustable.
  • the two fabric flexors bulge the material against a common stop, which is arranged on the throat plate of the blind sewing machine and is spring-loaded on the material in order to be able to deflect against the effect of the spring load by a variable amount by means of an adjusting screw (GB-A 13 31 476 ).
  • the invention has for its object to provide a blind sewing machine of the type specified in the preamble of claim 1, in which the flexor and its support can be kept extremely narrow, but still such a large installation space for the spring acting between the fabric flexor and the carrier It is available that the requirement for a characteristic curve as flat as possible for this spring can be met without further ado, and the possibility is opened for measures in order to be able to change the preload of the spring in an exceptionally wide range and to be able to set it to different values.
  • the narrow design of the fabric flexor and the carrier makes it possible to arrange the same feed elements for the sewing material on both sides at a very small mutual distance.
  • a second corresponding fabric flexor can also be provided without the narrow arrangement of the feed members having to be changed significantly.
  • the bow needle 1 and the needle plate 2 are arranged on the head of the blind sewing machine, the fabric flexor 3 and the conveyor belts 4 on its fabric support arm 5.
  • the bow needle 1 swings back and forth in the direction of arrows 6 and 7, the fabric flexor 3 oscillates in the direction of Arrows 8 and 9 and move the conveyor belts 4 step by step in the direction of arrows 10, the vibrations of the bow needle 1, the oscillations of the fabric flexor 3 and the movement steps of the conveyor belts 4 being coordinated with one another in the usual manner, so that the bow needle 1, the fabric flexor 3 and the conveyor belts 4 act in the required sequence on the sewing material, not shown, which extends between the needle plate 2 and the conveyor belts 4.
  • the fabric flexor 3 is designed as an approximately rectangular plate, extends along the plane defined by the line II-II in FIG. 1 and becomes in this plane perpendicular to the circular path of the curved needle 1 by means of a drive shaft 11 running perpendicular to the same in the direction of the arrows 8 and 9 swung back and forth.
  • the drive shaft 11 is rotatably mounted in the fabric support arm 5 and is provided at the end facing away from the fabric flexor 3 with an arm 12 which is articulated by means of a bolt 13 to a rod 14, through which the drive shaft 11 via the arm 12 in the direction of arrows 8 and 9 and can be swung here.
  • the fabric flexor 3 is connected to the drive shaft 11 by means of a carrier 15.
  • the carrier 15 for the fabric flexor 3 consists of two parallel plates 16 and 17 with identical triangular contours, which are connected to each other by a bolt 18 at the three corners of the two mutually aligned contours, extend perpendicular to the drive shaft 11 and approximately concentrically to the same are arranged so that the three bolts 18 run parallel to the drive shaft 11 and are approximately the same distance from the drive shaft 11.
  • the plates 16 and 17 delimit a slot 19 for receiving the plate-shaped fabric flexor 3, the width W of which corresponds to the width B of the fabric flexor 3 and which extends transversely in front of the adjacent end of the drive shaft 11.
  • the drive shaft side plate 17 of the carrier 15 is fastened by means of a clamping screw 20. The latter is screwed into a radial threaded bore 21 of a hub 22 of the plate 17 which is plugged onto the end of the drive shaft 11.
  • the drive shaft 11 is hollow and has a through bore 23 in which a cylindrical pin 24 is rotatably mounted and a torsion spring 25 is arranged.
  • the pin 24 protrudes with one end into the slot 19 of the carrier 15 and is provided at this end with a radially projecting cam 26 and an axially projecting extension 27 of smaller diameter, which is accommodated in a bore 28 of corresponding diameter of the plate 16 of the carrier 15 remote from the drive shaft is.
  • the torsion spring 25 engages.
  • the torsion spring 25 is designed as a helical spring with two ends 29 and 30 extending transversely to the longitudinal axis of the helical spring, which are each received in a transverse slot 31 at the adjacent end of the pin 24 or in a transverse slot 32 at the adjacent end of a holder 33.
  • the latter is cylindrical, rotatably mounted in the bore 23 of the drive shaft 11 and with four evenly distributed in the circumferential direction Longitudinal grooves 34 are provided for the engagement of a clamping screw 35 which fixes the holder 33 with respect to the drive shaft 11 and is screwed into a radial threaded bore 36 thereof.
  • the fabric flexor 3 is pivotally mounted in the slot 19 of the carrier 15 and is loaded by the torsion spring 25 via the pin 24 away from the drive shaft 11 and onto the path of movement of the curved needle 1.
  • the pin 18 of the latter which is adjacent to the needle plate 2 and which moves when the carrier 15 is pivoted in the direction of arrow 8 towards the needle plate 2, is used to mount the fabric flexor 3 on the carrier 15.
  • This bolt 18 passes through a corresponding bearing bore 37 of the fabric flexor 3, which is provided in the region of the corner 38 which is adjacent to the throat plate 2 and when the fabric flexor 3 is pivoted by means of the drive shaft 11 via the carrier 15 in the direction of arrow 8.
  • the fabric flexor 3 has an opening 39 which receives the cam 26 and the relevant end of the pin 24.
  • the opening 39 has such a shape that there are a nose 40 and two stop edges 41 and 42 on the fabric flexor 3.
  • the cam 26 of the pin 24 interacts with the nose 40 of the fabric flexor 3 in order to press the fabric flexor 3 as a result of the action of the torsion spring 25 into the position according to FIG. 2 with respect to the carrier 15, in which the stop edge 41 of the fabric flexor 3 on the cam side
  • the end of the pin 24 abuts and from which the fabric flexor 3 can pivot counterclockwise, specifically counter to the action of the torsion spring 25 by correspondingly pivoting the cam 26 resting on the nose 40 and rotating the pin 24 in the bore 23 of the drive shaft 11 up to 3 with respect to the support 15, in which the stop edge 42 of the fabric flexor 3 bears against the cam-side end of the pin 24.
  • the two stop edges 41 and 42 of the fabric flexor 3 thus limit the area in which the fabric flexor 3 can pivot within the slot 19 of the carrier 15.
  • the force with which the torsion spring 25 loads the flexor 3 into the position according to FIG. 2 with respect to the carrier 15 can be changed step by step.
  • To set the force required for the desired force Biasing the torsion spring 25 is sufficient to loosen the clamping screw 35 of the drive shaft 11 which interacts with the holder 33 for the torsion spring 25, the holder 33 by means of a screwdriver inserted in a transverse slot 43 at the end of the drive spring 11 facing away from the torsion spring 25 in the bore 23 of the drive shaft 11 to rotate accordingly, so that again a longitudinal groove 34 of the holder 33 comes in front of the clamping screw 35, and tighten the latter again.
  • the two conveyor belts 4 extend parallel to the plane defined by line II-II in FIG. 1, in which the fabric flexor 3 and its carrier 15 can be pivoted back and forth by means of the drive shaft 11 and the fabric flexor 3 can pivot with respect to the carrier 15 , namely on both sides of the fabric flexor 3 and the carrier 15.
  • Each endless conveyor belt 4 runs via a pressure lever 44, a deflection wheel 45 and a drive wheel 46.
  • the pressure lever 44 is pivoted at one end about an axis 47 on the fabric support arm 5 and on the needle plate 2 too spring loaded.
  • the deflection wheel 45 is rotatably mounted on an axis 48 on the fabric support arm 5.
  • the drive wheel 46 is fastened on a drive shaft 49, which is rotatably mounted in the fabric support arm 5 and carries the drive wheels 46 of both conveyor belts 4.
  • the two axes 47 and 48 and the drive shaft 49 extend parallel to the drive shaft 11 of the fabric flexor 3.
  • the two conveyor belts 4 can be arranged very closely next to one another, so that the mutual distance is very small.
  • the fabric flexor 3 can have a width B of approximately 1.2 mm and the two plates 16 and 17 of the carrier 15 can each have a thickness of approximately 0.8 mm.
  • the conveyor belts 4 move the sewing material step by step in the direction of the arrows 10 and the fabric flexor 3 bulges the sewing material after each feed step through a slot 50 of the needle plate 2 running in the sewing material advancing direction 10, after which the curved needle 1 pierces the bulging sewing material, and although the deeper, the further the fabric flexor 3 has bulged the sewing material over the circular path of movement of the curved needle 1, which depends on the thickness of the bulging sewing material and depends on the distance up to which the fabric flexor 3 approaches the path of movement of the curved needle 1 when it is pivoted by means of the drive shaft 11 via the carrier 15 in the direction of arrow 8.
  • the sewing material is held particularly securely because the gap between the two conveyor belts 4 pressing the sewing material on both sides of the fabric flexor 3 by means of the pressing lever 44 against the needle plate 2 is relatively narrow.
  • the fabric support arm 5 can be adjusted with respect to the head of the blind sewing machine in such a way that the distance required for the desired penetration depth, taking into account the normal thickness of the respective sewing material, is obtained, up to which there is the fabric flexor 3 when pivoting in the direction of arrow 8 together with the carrier 15 in the mutual position according to FIG. 2 can approach the path of movement of the bow needle 1.
  • the set penetration depth is maintained even when a thickening of the material, such as a transverse seam, comes into the area of the fabric flexor 3 because this then moves from the position according to FIG.
  • the fabric support arm 5 of the blind sewing machine is shown in the position with respect to its head in which the two conveyor belts 4 for the material to be sewn in the area of the pressure lever 44 lie directly on the needle plate 2 and the smallest possible distance of the fabric flexor 3 from the movement path the bow needle 1 is zero.
  • the carrier 15 and the drive shaft 11 of the fabric flexor 3 are illustrated in the position which they assume at the end of the pivoting movement in the direction of the arrow 8 and at the beginning of the pivoting movement in the direction of the arrow 9.
  • the blind sewing machine according to FIGS. 4 and 5 differs essentially only from that according to FIGS. 1 to 3 in that a second fabric flexor 3 ' is provided, which is identical in design, arrangement and mode of operation with the first fabric flexor 3, apart from the fact that the drive shaft 11 ', the carrier 15', the pin 24 'and the torsion spring 25' of the second fabric flexor 3 'mirror image of the drive shaft 11, the carrier 15, the pin 24 and the torsion spring 25 of the first fabric flexor 3 are formed and arranged, as is the holder 33 ′ for the torsion spring 25 ′ of the second fabric flexor 3 ′ to the holder 33 for the torsion spring 25 of the first fabric flexor 3
  • the two hollow drive shafts 11 and 11 'thus extend aligned with one another on both sides of the pair of fabric flexors 3, 3', each away from the carrier 15 or 15 'of the associated fabric flexor 3 or 3'.
  • the hollow drive shaft 11 'of the second fabric flexor 3' is rotatably supported in a support 51 and connected via a toothed belt drive to a further drive shaft 52 which is arranged parallel to the two hollow drive shafts 11 and 11 '.
  • the toothed belt drive consists of a toothed belt wheel 53 fastened on the hollow drive shaft 11 ', a toothed belt wheel 54 fastened on the additional drive shaft 52 and an endless toothed belt 55 which loops around the two toothed belt wheels 53 and 54.
  • the further drive shaft 52 is provided with an arm 12 ', which is articulated by means of a bolt 13' on a rod 14 ', by means of which the drive shaft 52 can be pivoted back and forth over the arm 12'.
  • the two fabric flexors 3 and 3 ' can be driven from the same side, namely the right side in FIG. 4 and the free end of the fabric support arm 5.
  • the support 51 is pivotably mounted on the fabric support arm 5 and is provided with a hollow axis 56 on the side facing away from the toothed belt drive and facing the pair of fabric flexors 3, 3 '.
  • a hollow axis 56 In its bore 57, which is also passed through the support 51 and extends transversely therethrough, is the second drive shaft 52 for the second fabric flexor 3 ' rotatably mounted.
  • the axis 56 is in turn rotatably mounted in a longitudinal bore 58 of the fabric support arm 5.
  • the fabric support arm 5 is pivotally mounted on the housing 59 of the blind sewing machine about an axis 60 and is loaded by a tension spring 61 into the sewing position shown, in which the fabric support arm 5 is supported on the housing 59 via a first adjusting screw 62, which is supported in one after tongue 63 projecting below the front longitudinal wall 64 of the fabric support arm 5 can be screwed.
  • the axis 60 runs parallel to the drive shafts 11, 11 'and 52 for the textile beers 3 and 3' and the helical tension spring 61 engages on the one hand on the tongue 63 and on the other hand on the housing 59.
  • the support 51 of the first drive shaft 11 'for the second fabric flexor 3' which can be pivoted about the common longitudinal axis of the second drive shaft 52 for the second fabric flexor 3 'about the common longitudinal axis of the second drive shaft 52', and the support 51 of the first drive shaft 11 'for the second fabric flexor 3', which is coaxial with the same, is loaded by a helical compression spring 65, which is self-supporting is supported on the one hand on a downwardly projecting projection 66 of the support 51 and on the other hand on the fabric support arm 5 or on the housing 59 of the blind sewing machine and the projection 66 provided on the bearing axis 56 alongside the arm 12 ′ of the second drive shaft 52 according to FIG.

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

Abstract

The invention pertains to a blind-stitch sewing machine with a plate-shaped fabric bender to make a sewing material bulge in to the arcuate path of an arc needle. The fabric bender extends in a plane perpendicular to the path of the arc needle and is pivotable to-and-fro in this plane by means of a drive shaft extending perpendicular to this plane. The fabric bender is rotatably supported in a slot of a support assembly projecting from the drive shaft to pivot about an axis parallel to this drive shaft, and furthermore is spring biased away from the drive shaft. To achieve a narrow construction of the fabric bender and of its support assembly, the drive shaft is hollow and a torsion spring is provided to load the fabric bender. The torsion spring is mounted in the borehole of the hollow shaft where adequate space is available to install the spring.

Description

Die Erfindung bezieht sich auf eine Blindnähmaschine der im Oberbegriff des Patentanspruchs 1 angegebenen Art.The invention relates to a blind sewing machine specified in the preamble of claim 1.

Solche Blindnähmaschinen sind bekannt (US-A 23 55 904 und DE-A 20 37 502). Dabei ist der plattenförmige Stoffbeuger etwa in der Mitte bzw. an einem Ende an seinem Träger schwenkbar gelagert und durch eine Zug- bzw. Druckfeder von der massiven Antriebswelle für den Stoffbeuger weg belastet, welche im Stofftragarm der Blindnähmaschine drehbar gelagert ist und beim Nähen im Takte der hin- und herschwingenden Bogennadel der Blindnähmaschine sowie des zeitlich darauf abgestimmten schrittweisen Nähgutvorschubs hin- und herschwenkt. Der quer zur Antriebswelle verlaufende Schlitz des Trägers zur Aufnahme des Stoffbeugers mit einer der Stoffbeugerbreite entsprechenden Schlitzweite ist an dem der Antriebswelle abgewandten Ende des von derselben senkrecht abstehenden Trägers vorgesehen.Such blind sewing machines are known (US-A 23 55 904 and DE-A 20 37 502). The plate-shaped fabric flexor is pivotally mounted in the middle or at one end on its support and is loaded by a tension or compression spring away from the massive drive shaft for the fabric flexor, which is rotatably mounted in the fabric support arm of the blind sewing machine and when sewing in cycles the swinging bow needle of the blind sewing machine as well as the timed step-by-step feed feed swings back and forth. The slot of the carrier running transversely to the drive shaft for receiving the fabric flexor with a slot width corresponding to the fabric flexor width is provided at that end of the support which projects perpendicularly from the drive shaft.

Die Zugfeder greift einerseits an einem Ende des Stoffbeugers und andererseits an einem ebenfalls radial zur Antriebswelle verlaufenden Arm des Trägers an, um den Stoffbeuger mit einem Anschlag gegen den Boden des Schlitzes im Träger zu drücken. Aus dieser Stellung kann der Stoffbeuger entgegen der Wirkung der Zugfeder verschwenken, wobei sein anderes Ende sich von der Bewegungsbahn der Bogennadel weg auf die Antriebswelle des Stoffbeugers zu bewegt. Dieses geschieht immer dann, wenn beim Nähen eine Verdickung des Nähgutes in den Bereich des Stoffbeugers gelangt, und zwar mit Hilfe eines Nähgutabtasters in Form eines Seitenfingers an dem zugfederfernen Ende des Stoffbeugers, welcher beim Einstich der Bogennadel in das durch den Stoffbeuger ausgewölbte Nähgut genau gegenüber der Bogennadel am Nähgut neben der Auswölbung desselben anliegt.The tension spring engages on the one hand at one end of the fabric flexor and on the other hand on an arm of the carrier which also extends radially to the drive shaft in order to press the fabric flexor with a stop against the bottom of the slot in the carrier. From this position, the fabric flexor can pivot against the action of the tension spring, its other end moving away from the path of movement of the curved needle toward the drive shaft of the fabric flexor. This always happens when a thickening of the sewing material gets into the area of the fabric flexor, with the help of a sewing material scanner in the form of a side finger on the end of the fabric flexor that is remote from the tension spring, which is exactly opposite when the bow needle is inserted into the material bulged out by the fabric flexor the curved needle rests on the material next to the bulge.

Die Druckfeder ist in einer Längsbohrung des Trägers angeordnet und stützt sich einerseits an einer darin zur Veränderung der Vorspannung der Druckfeder verschraubbaren Einstellschraube und andererseits über eine Kugel an dem schwenkachsenfernen Ende des Stoffbeugers ab. Zur Begrenzung desjenigen Bereichs, in welchem der Stoffbeuger innerhalb des Schlitzes im Träger verschwenken kann, ist der Träger mit einem Anschlagstift versehen, welcher sich quer im Schlitz durch ein Langloch des Stoffbeugers hindurch erstreckt, das kreisbogenförmig ausgebildet und konzentrisch zur Schwenkachse des Stoffbeugers angeordnet ist. Die Druckfeder drückt den Stoffbeuger mit dem benachbarten Ende des Langlochs gegen den Anschlagstift. Aus dieser Stellung kann der Stoffbeuger entgegen der Wirkung der Druckfeder bis zur Anlage des anderen Endes seines Langlochs am Anschlagstift verschwenken, wobei sich das druckfederseitige Ende des Stoffbeugers von der Bewegungsbahn der Bogennadel weg auf die Antriebswelle des Stoffbeugers zu bewegt. Der Stoffbeuger verschwenkt immer dann aus der erstgenannten Stellung, wenn beim Nähen eine Nähgutverdickung zwischen den Stoffbeuger und einen Anschlag an der Stichplatte der Blindnähmaschine gelangt, gegen welchen der Stoffbeuger das Nähgut auswölbt und welcher auf das Nähgut zu federbelastet ist, um entgegen der Wirkung der Federbelastung ausweichen zu können, und zwar um ein Ausmaß, das mittels einer Einstellschraube verändert werden kann.The compression spring is arranged in a longitudinal bore of the support and is supported on the one hand by an adjusting screw which can be screwed therein to change the pretension of the compression spring and on the other hand by a ball on the end of the fabric flexor remote from the pivot axis. To limit the area in which the fabric flexor within the slot in the carrier can pivot, the carrier is provided with a stop pin, which extends transversely in the slot through an elongated hole of the fabric flexor, which is formed in a circular arc and is arranged concentrically to the pivot axis of the fabric flexor. The compression spring presses the fabric flexor with the adjacent end of the elongated hole against the stop pin. From this position, the fabric flexor can pivot against the action of the compression spring until the other end of its elongated hole rests on the stop pin, the compression spring end of the fabric flexer moving away from the path of movement of the curved needle toward the drive shaft of the fabric flexor. The fabric flexor always pivots out of the first-mentioned position when a sewing material thickening between the fabric flexor and a stop on the stitch plate of the blind sewing machine, against which the fabric flexor bulges the material and which is spring-loaded on the material, counteracts the effect of the spring load to be able to dodge, to an extent that can be changed by means of an adjusting screw.

Bekannt sind auch Blindnähmaschinen mit einem solchen über eine Druckfeder in einem Träger abgestützten und mit einem derartigen Anschlag zusammenwirkenden Stoffbeuger und mit einem zweiten ebenfalls plattenförmigen sowie hin- und herschwenkbaren Stoffbeuger, welcher jedoch starr mit der zugehörigen Antriebswelle verbunden ist und mit einem auf das Nähgut zu federbelasteten Anschlag an der Stichplatte der Blindnähmaschine zusammenwirkt, bei dem das Ausmaß der Ausweichbewegung nicht einstellbar ist. Die beiden Stoffbeuger sind nebeneinander angeordnet und wölben das Nähgut beim Nähen wechselweise jeweils gegen den zugehörigen Anschlag aus (US-A 37 47 546).Also known are blind sewing machines with such a fabric flexor which is supported by a compression spring in a support and which cooperates with such a stop, and with a second fabric flexor which is also plate-shaped and can be pivoted back and forth, but which is rigidly connected to the associated drive shaft and with one towards the material to be sewn spring-loaded stop cooperates on the throat plate of the blind sewing machine, in which the extent of the evasive movement is not adjustable. The two fabric flexors are arranged next to each other and alternately bulge the material to be sewn against the associated stop (US Pat. No. 3,747,546).

Bei anderen bekannten Blindnähmaschinen dieser Art sind die beiden Stoffbeuger jeweils stabförmig ausgebildet und mittels der zugehörigen Antriebswelle axial hin- und herbewegbar, wobei jeder Stoffbeuger federnd nachgiebig gelagert ist, und zwar in einer mit der jeweiligen Antriebswelle verbundenen Hülse, in welcher eine den Stoffbeuger belastende Druckfeder angeordnet ist, deren Vorspannung mittels einer Einstellschraube verändert werden kann. Die Antriebswelle des einen Stoffbeugers ist hohl ausgebildet und auf der Antriebswelle des anderen Stoffbeugers drehbar gelagert, welche ihrerseits im Stofftragarm der Blindnähmaschine drehbar gelagert ist. Letzterer ist in die Nähstellung zur Anlage an einem Anschlag federbelastet, welcher zur Veränderung des Abstandes des in der Nähstellung befindlichen Stofftragarms von der Bewegungsbahn der Bogennadel der Blindnähmaschine und somit zur Einstellung der Einstichtiefe der Bogennadel in das von den Stoffbeugern ausgewölbte Nähgut mittels einer Einstellschraube über ein Gestänge verstellbar ist. Die beiden Stoffbeuger wölben das Nähgut gegen einen gemeinsamen Anschlag aus, welcher an der Stichplatte der Blindnähmaschine angeordnet und auf das Nähgut zu federbelastet ist, um entgegen der Wirkung der Federbelastung um ein mittels einer Einstellschraube veränderbares Ausmaß ausweichen zu können (GB-A 13 31 476).In other known blind sewing machines of this type, the two fabric flexors are each rod-shaped and can be moved axially back and forth by means of the associated drive shaft, each fabric flexor being resiliently mounted, specifically in a sleeve connected to the respective drive shaft, in which a compression spring loading the fabric flexor is arranged, the bias of which can be changed by means of an adjusting screw. The drive shaft of one fabric flexor is hollow and rotatably mounted on the drive shaft of the other fabric flexor, which in turn is rotatably mounted in the fabric arm of the blind sewing machine. The latter is spring-loaded in the sewing position for abutment against a stop, which is used to change the distance of the fabric support arm in the sewing position from the path of movement of the curved needle of the blind sewing machine and thus to adjust the penetration depth of the curved needle into the material bulged by the fabric flexors by means of an adjusting screw Linkage is adjustable. The two fabric flexors bulge the material against a common stop, which is arranged on the throat plate of the blind sewing machine and is spring-loaded on the material in order to be able to deflect against the effect of the spring load by a variable amount by means of an adjusting screw (GB-A 13 31 476 ).

Der Erfindung liegt die Aufgabe zugrunde, eine Blindnähmaschine der im Oberbegriff des Patentanspruchs 1 angegebenen Gattung zu schaffen, bei welcher der Stoffbeuger und dessen Träger außerordentlich schmal gehalten werden können, dennoch aber ein derart großer Einbauraum für die zwischen dem Stoffbeuger und dem Träger wirkende Feder zur Verfügung steht, daß die Forderung nach einer möglichst flachen Kennlinie für diese Feder ohne weiteres erfüllt werden kann, und die Möglichkeit für Maßnahmen eröffnet ist, um die Vorspannung der Feder in einem außergewöhnlich weiten Bereich verändern und auf unterschiedliche Werte einstellen zu können. Die schmale Bauweise des Stoffbeugers und des Trägers ermöglicht es, beiderseits derselben Vorschuborgane für das Nähgut in einem sehr geringen gegenseitigen Abstand anzuordnen. Auch kann ein zweiter entsprechender Stoffbeuger vorgesehen werden, ohne daß die enge Anordnung der Vorschuborgane wesentlich geändert werden müßte.The invention has for its object to provide a blind sewing machine of the type specified in the preamble of claim 1, in which the flexor and its support can be kept extremely narrow, but still such a large installation space for the spring acting between the fabric flexor and the carrier It is available that the requirement for a characteristic curve as flat as possible for this spring can be met without further ado, and the possibility is opened for measures in order to be able to change the preload of the spring in an exceptionally wide range and to be able to set it to different values. The narrow design of the fabric flexor and the carrier makes it possible to arrange the same feed elements for the sewing material on both sides at a very small mutual distance. A second corresponding fabric flexor can also be provided without the narrow arrangement of the feed members having to be changed significantly.

Diese Aufgabe ist durch die im kennzeichnenden Teil des Patentanspruchs 1 angegebenen Merkmale gelöst. Vorteilhafte Weiterbildungen der erfindungsgemäßen Blindnähmaschine sind in den restlichen Patentansprüchen angegeben.This object is achieved by the features specified in the characterizing part of patent claim 1. Advantageous further developments of the blind sewing machine according to the invention are specified in the remaining claims.

Nachstehend sind zwei Ausführungsformen der erfindungsgemäßen Blindnähmaschine anhand von Zeichnungen beispielsweise beschrieben. Darin zeigt:

Fig. 1
die Vorderansicht einer erfindungsgemäßen Blindnähmaschine mit einem Stoffbeuger im Bereich des Kopfes und des demselben benachbarten Endes des Stofftragarms, welcher teilweise längsgeschnitten ist, und zwar entlang der die Längsachse der Antriebswelle für den Stoffbeuger enthaltenden senkrechten Ebene;
Fig. 2
den Schnitt entlang der Linie II-II in Fig. 1;
Fig. 3
den Schnitt gemäß Fig. 2, wobei jedoch der Stoffbeuger in seinem Träger entgegen dem Uhrzeigersinn verschwenkt ist;
Fig. 4
die Vorderansicht analog derjenigen nach Fig. 1 einer erfindungsgemäßen Blindnähmaschine mit zwei Stoffbeugern; und
Fig. 5
die Ansicht dieser Blindnähmaschine in Richtung des Pfeils V in Fig. 4.
Two embodiments of the blind sewing machine according to the invention are described below with reference to drawings, for example. It shows:
Fig. 1
the front view of a blind sewing machine according to the invention with a fabric flexor in the region of the head and the same adjacent end of the fabric support arm, which is partially cut longitudinally, along the vertical plane containing the longitudinal axis of the drive shaft for the fabric flexor;
Fig. 2
the section along the line II-II in Fig. 1;
Fig. 3
the section of Figure 2, but the fabric flexor is pivoted counterclockwise in its support.
Fig. 4
the front view analogous to that of Figure 1 of a blind sewing machine according to the invention with two fabric flexors. and
Fig. 5
the view of this blind sewing machine in the direction of arrow V in Fig. 4th

Die Blindnähmaschine nach Fig. 1 bis 3 weist eine Bogennadel 1, eine Stichplatte 2, einen Stoffbeuger 3 und zwei Transportbänder 4 auf. Die Bogennadel 1 und die Stichplatte 2 sind am Kopf der Blindnähmaschine angeordnet, der Stoffbeuger 3 und die Transportbänder 4 an deren Stofftragarm 5. Beim Nähen schwingt die Bogennadel 1 in Richtung der Pfeile 6 und 7 hin und her, oszilliert der Stoffbeuger 3 in Richtung der Pfeile 8 und 9 und bewegen sich die Transportbänder 4 schrittweise in Richtung der Pfeile 10, wobei die Schwingungen der Bogennadel 1, die Oszillationen des Stoffbeugers 3 und die Bewegungsschritte der Transportbänder 4 in der üblichen Weise zeitlich aufeinander abgestimmt sind, so daß die Bogennadel 1, der Stoffbeuger 3 und die Transportbänder 4 in der erforderlichen Aufeinanderfolge auf das nicht dargestellte Nähgut einwirken, welches sich zwischen der Stichplatte 2 und den Transportbändern 4 erstreckt.1 to 3 has a curved needle 1, a needle plate 2, a fabric flexor 3 and two conveyor belts 4. The bow needle 1 and the needle plate 2 are arranged on the head of the blind sewing machine, the fabric flexor 3 and the conveyor belts 4 on its fabric support arm 5. When sewing, the bow needle 1 swings back and forth in the direction of arrows 6 and 7, the fabric flexor 3 oscillates in the direction of Arrows 8 and 9 and move the conveyor belts 4 step by step in the direction of arrows 10, the vibrations of the bow needle 1, the oscillations of the fabric flexor 3 and the movement steps of the conveyor belts 4 being coordinated with one another in the usual manner, so that the bow needle 1, the fabric flexor 3 and the conveyor belts 4 act in the required sequence on the sewing material, not shown, which extends between the needle plate 2 and the conveyor belts 4.

Der Stoffbeuger 3 ist als etwa rechteckige Platte ausgebildet, erstreckt sich entlang der durch die Linie II-II in Fig. 1 definierten Ebene und wird in dieser zur kreisbogenförmigen Bewegungsbahn der Bogennadel 1 senkrechten Ebene mittels einer senkrecht zu derselben verlaufenden Antriebswelle 11 in Richtung der Pfeile 8 und 9 hin- und hergeschwenkt. Die Antriebswelle 11 ist im Stofftragarm 5 drehbar gelagert und an dem dem Stoffbeuger 3 abgewandten Ende mit einem Arm 12 versehen, welcher mittels eines Bolzens 13 an eine Stange 14 angelenkt ist, durch welche die Antriebswelle 11 über den Arm 12 in Richtung der Pfeile 8 und 9 hin- und hergeschwenkt werden kann. Der Stoffbeuger 3 ist mittels eines Trägers 15 mit der Antriebswelle 11 verbunden.The fabric flexor 3 is designed as an approximately rectangular plate, extends along the plane defined by the line II-II in FIG. 1 and becomes in this plane perpendicular to the circular path of the curved needle 1 by means of a drive shaft 11 running perpendicular to the same in the direction of the arrows 8 and 9 swung back and forth. The drive shaft 11 is rotatably mounted in the fabric support arm 5 and is provided at the end facing away from the fabric flexor 3 with an arm 12 which is articulated by means of a bolt 13 to a rod 14, through which the drive shaft 11 via the arm 12 in the direction of arrows 8 and 9 and can be swung here. The fabric flexor 3 is connected to the drive shaft 11 by means of a carrier 15.

Der Träger 15 für den Stoffbeuger 3 besteht aus zwei parallelen Platten 16 und 17 mit identischen dreieckigen Umrissen, welche an den drei Ecken der beiden aufeinander ausgerichteten Umrisse durch je einen Bolzen 18 miteinander verbunden sind, sich senkrecht zur Antriebswelle 11 erstrecken und etwa konzentrisch zu derselben angeordnet sind, so daß also die drei Bolzen 18 parallel zur Antriebswelle 11 verlaufen und etwa gleich weit von der Antriebswelle 11 entfernt sind. Die Platten 16 und 17 begrenzen einen Schlitz 19 zur Aufnahme des plattenförmigen Stoffbeugers 3, dessen Weite W der Breite B des Stoffbeugers 3 entspricht und welcher sich quer vor dem benachbarten Ende der Antriebswelle 11 erstreckt. An diesem Ende ist die antriebswellenseitige Platte 17 des Trägers 15 mittels einer Klemmschraube 20 befestigt. Letztere ist in eine radiale Gewindebohrung 21 einer auf das Ende der Antriebswelle 11 aufgesteckten Nabe 22 der Platte 17 eingeschraubt.The carrier 15 for the fabric flexor 3 consists of two parallel plates 16 and 17 with identical triangular contours, which are connected to each other by a bolt 18 at the three corners of the two mutually aligned contours, extend perpendicular to the drive shaft 11 and approximately concentrically to the same are arranged so that the three bolts 18 run parallel to the drive shaft 11 and are approximately the same distance from the drive shaft 11. The plates 16 and 17 delimit a slot 19 for receiving the plate-shaped fabric flexor 3, the width W of which corresponds to the width B of the fabric flexor 3 and which extends transversely in front of the adjacent end of the drive shaft 11. At this end, the drive shaft side plate 17 of the carrier 15 is fastened by means of a clamping screw 20. The latter is screwed into a radial threaded bore 21 of a hub 22 of the plate 17 which is plugged onto the end of the drive shaft 11.

Die Antriebswelle 11 ist hohl ausgebildet und weist eine durchgehende Bohrung 23 auf, in welcher ein zylindrischer Zapfen 24 drehbar gelagert und eine Drehfeder 25 angeordnet ist. Der Zapfen 24 ragt mit einem Ende in den Schlitz 19 des Trägers 15 und ist an diesem Ende mit einem radial abstehenden Nocken 26 sowie einem axial abstehenden Fortsatz 27 geringeren Durchmessers versehen, welcher in einer Bohrung 28 entsprechenden Durchmessers der antriebswellenfernen Platte 16 des Trägers 15 aufgenommen ist. Am anderen Ende des Zapfens 24 greift die Drehfeder 25 an.The drive shaft 11 is hollow and has a through bore 23 in which a cylindrical pin 24 is rotatably mounted and a torsion spring 25 is arranged. The pin 24 protrudes with one end into the slot 19 of the carrier 15 and is provided at this end with a radially projecting cam 26 and an axially projecting extension 27 of smaller diameter, which is accommodated in a bore 28 of corresponding diameter of the plate 16 of the carrier 15 remote from the drive shaft is. At the other end of the pin 24, the torsion spring 25 engages.

Die Drehfeder 25 ist als Schraubenfeder mit zwei quer zur Schraubenfederlängsachse verlaufenden Enden 29 und 30 ausgebildet, welche jeweils in einem Querschlitz 31 am benachbarten Ende des Zapfens 24 bzw. in einem Querschlitz 32 am benachbarten Ende eines Halters 33 aufgenommen sind. Letzterer ist zylindrisch ausgebildet, in der Bohrung 23 der Antriebswelle 11 drehbar gelagert und mit vier in Umfangsrichtung gleichmäßig verteilten Längsnuten 34 für den Eingriff einer Klemmschraube 35 versehen, welche den Halter 33 bezüglich der Antriebswelle 11 fixiert und in eine radiale Gewindebohrung 36 derselben eingeschraubt ist.The torsion spring 25 is designed as a helical spring with two ends 29 and 30 extending transversely to the longitudinal axis of the helical spring, which are each received in a transverse slot 31 at the adjacent end of the pin 24 or in a transverse slot 32 at the adjacent end of a holder 33. The latter is cylindrical, rotatably mounted in the bore 23 of the drive shaft 11 and with four evenly distributed in the circumferential direction Longitudinal grooves 34 are provided for the engagement of a clamping screw 35 which fixes the holder 33 with respect to the drive shaft 11 and is screwed into a radial threaded bore 36 thereof.

Der Stoffbeuger 3 ist im Schlitz 19 des Trägers 15 schwenkbar gelagert und durch die Drehfeder 25 über den Zapfen 24 von der Antriebswelle 11 weg und auf die Bewegungsbahn der Bogennadel 1 zu belastet. Zur Lagerung des Stoffbeugers 3 am Träger 15 dient derjenige Bolzen 18 des letzteren, welcher der Stichplatte 2 benachbart ist und sich beim Verschwenken des Trägers 15 in Richtung des Pfeils 8 auf die Stichplatte 2 zu bewegt. Dieser Bolzen 18 durchsetzt eine entsprechende Lagerbohrung 37 des Stoffbeugers 3, welche im Bereich von dessen der Stichplatte 2 benachbarter und beim Verschwenken des Stoffbeugers 3 mittels der Antriebswelle 11 über den Träger 15 in Richtung des Pfeils 8 nachlaufender Ecke 38 vorgesehen ist. Weiterhin weist der Stoffbeuger 3 eine Öffnung 39 auf, welche den Nocken 26 und das betreffende Ende des Zapfens 24 aufnimmt. Die Öffnung 39 hat eine solche Form, daß sich eine Nase 40 und zwei Anschlagkanten 41 und 42 am Stoffbeuger 3 ergeben.The fabric flexor 3 is pivotally mounted in the slot 19 of the carrier 15 and is loaded by the torsion spring 25 via the pin 24 away from the drive shaft 11 and onto the path of movement of the curved needle 1. The pin 18 of the latter, which is adjacent to the needle plate 2 and which moves when the carrier 15 is pivoted in the direction of arrow 8 towards the needle plate 2, is used to mount the fabric flexor 3 on the carrier 15. This bolt 18 passes through a corresponding bearing bore 37 of the fabric flexor 3, which is provided in the region of the corner 38 which is adjacent to the throat plate 2 and when the fabric flexor 3 is pivoted by means of the drive shaft 11 via the carrier 15 in the direction of arrow 8. Furthermore, the fabric flexor 3 has an opening 39 which receives the cam 26 and the relevant end of the pin 24. The opening 39 has such a shape that there are a nose 40 and two stop edges 41 and 42 on the fabric flexor 3.

Mit der Nase 40 des Stoffbeugers 3 wirkt der Nocken 26 des Zapfens 24 zusammen, um den Stoffbeuger 3 infolge der Wirkung der Drehfeder 25 in die Stellung gemäß Fig. 2 bezüglich des Trägers 15 zu drücken, in welcher die Anschlagkante 41 des Stoffbeugers 3 am nockenseitigen Ende des Zapfens 24 anliegt und aus welcher der Stoffbeuger 3 entgegen dem Uhrzeigersinn verschwenken kann, und zwar entgegen der Wirkung der Drehfeder 25 unter entsprechender Verschwenkung des an der Nase 40 anliegenden Nockens 26 und Verdrehung des Zapfens 24 in der Bohrung 23 der Antriebswelle 11 bis in die Stellung des Stoffbeugers 3 gemäß Fig. 3 bezüglich des Trägers 15, in welcher die Anschlagkante 42 des Stoffbeugers 3 am nockenseitigen Ende des Zapfens 24 anliegt. Die beiden Anschlagkanten 41 und 42 des Stoffbeugers 3 begrenzen also denjenigen Bereich, in welchem der Stoffbeuger 3 innerhalb des Schlitzes 19 des Trägers 15 verschwenken kann.The cam 26 of the pin 24 interacts with the nose 40 of the fabric flexor 3 in order to press the fabric flexor 3 as a result of the action of the torsion spring 25 into the position according to FIG. 2 with respect to the carrier 15, in which the stop edge 41 of the fabric flexor 3 on the cam side The end of the pin 24 abuts and from which the fabric flexor 3 can pivot counterclockwise, specifically counter to the action of the torsion spring 25 by correspondingly pivoting the cam 26 resting on the nose 40 and rotating the pin 24 in the bore 23 of the drive shaft 11 up to 3 with respect to the support 15, in which the stop edge 42 of the fabric flexor 3 bears against the cam-side end of the pin 24. The two stop edges 41 and 42 of the fabric flexor 3 thus limit the area in which the fabric flexor 3 can pivot within the slot 19 of the carrier 15.

Die Kraft, mit welcher die Drehfeder 25 den Stoffbeuger 3 in die Stellung gemäß Fig. 2 bezüglich des Trägers 15 belastet, kann schrittweise verändert werden. Zur Einstellung der für die jeweils gewünschte Kraft erforderlichen Vorspannung der Drehfeder 25 genügt es, die mit dem Halter 33 für die Drehfeder 25 zusammenwirkende Klemmschraube 35 der Antriebswelle 11 zu lösen, den Halter 33 mittels eines in einen Querschlitz 43 an dessen der Drehfeder 25 abgewandtem Ende eingesetzten Schraubenziehers in der Bohrung 23 der Antriebswelle 11 entsprechend zu verdrehen, so daß wieder eine Längsnut 34 des Halters 33 vor die Klemmschraube 35 gelangt, und letztere wieder festzuziehen.The force with which the torsion spring 25 loads the flexor 3 into the position according to FIG. 2 with respect to the carrier 15 can be changed step by step. To set the force required for the desired force Biasing the torsion spring 25 is sufficient to loosen the clamping screw 35 of the drive shaft 11 which interacts with the holder 33 for the torsion spring 25, the holder 33 by means of a screwdriver inserted in a transverse slot 43 at the end of the drive spring 11 facing away from the torsion spring 25 in the bore 23 of the drive shaft 11 to rotate accordingly, so that again a longitudinal groove 34 of the holder 33 comes in front of the clamping screw 35, and tighten the latter again.

Die beiden Transportbänder 4 erstrecken sich parallel zu der durch die Linie II-II in Fig. 1 definierten Ebene, in welcher der Stoffbeuger 3 und sein Träger 15 mittels der Antriebswelle 11 hin- und herschwenkbar sind und der Stoffbeuger 3 bezüglich des Trägers 15 verschwenken kann, und zwar beiderseits des Stoffbeugers 3 und des Trägers 15. Jedes endlose Transportband 4 läuft über einen Anpreßhebel 44, ein Umlenkrad 45 und ein Antriebsrad 46. Der Anpreßhebel 44 ist an einem Ende um eine Achse 47 schwenkbar am Stofftragarm 5 gelagert und auf die Stichplatte 2 zu federbelastet. Das Umlenkrad 45 ist auf einer Achse 48 am Stofftragarm 5 drehbar gelagert. Das Antriebsrad 46 ist auf einer Antriebswelle 49 befestigt, welche im Stofftragarm 5 drehbar gelagert ist und die Antriebsräder 46 beider Transportbänder 4 trägt. Die beiden Achsen 47 und 48 sowie die Antriebswelle 49 erstrecken sich parallel zur Antriebswelle 11 des Stoffbeugers 3.The two conveyor belts 4 extend parallel to the plane defined by line II-II in FIG. 1, in which the fabric flexor 3 and its carrier 15 can be pivoted back and forth by means of the drive shaft 11 and the fabric flexor 3 can pivot with respect to the carrier 15 , namely on both sides of the fabric flexor 3 and the carrier 15. Each endless conveyor belt 4 runs via a pressure lever 44, a deflection wheel 45 and a drive wheel 46. The pressure lever 44 is pivoted at one end about an axis 47 on the fabric support arm 5 and on the needle plate 2 too spring loaded. The deflection wheel 45 is rotatably mounted on an axis 48 on the fabric support arm 5. The drive wheel 46 is fastened on a drive shaft 49, which is rotatably mounted in the fabric support arm 5 and carries the drive wheels 46 of both conveyor belts 4. The two axes 47 and 48 and the drive shaft 49 extend parallel to the drive shaft 11 of the fabric flexor 3.

Aufgrund der außerordentlich schmalen Bauweise des Stoffbeugers 3 und seines Trägers 15 können die beiden Transportbänder 4 sehr eng nebeneinander angeordnet werden, so daß der gegenseitige Abstand sehr gering ist. Beispielsweise kann der Stoffbeuger 3 eine Breite B von etwa 1,2 mm aufweisen und können die beiden Platten 16 und 17 des Trägers 15 jeweils eine Stärke von etwa 0,8 mm haben.Due to the extremely narrow construction of the fabric flexor 3 and its carrier 15, the two conveyor belts 4 can be arranged very closely next to one another, so that the mutual distance is very small. For example, the fabric flexor 3 can have a width B of approximately 1.2 mm and the two plates 16 and 17 of the carrier 15 can each have a thickness of approximately 0.8 mm.

Beim Nähen bewegen die Transportbänder 4 das Nähgut schrittweise in Richtung der Pfeile 10 und wölbt der Stoffbeuger 3 das Nähgut nach jedem Vorschubschritt durch einen in der Nähgutvorschubrichtung 10 verlaufenden Schlitz 50 der Stichplatte 2 hindurch aus, wonach die Bogennadel 1 in das ausgewölbte Nähgut einsticht, und zwar umso tiefer, je weiter der Stoffbeuger 3 das Nähgut über die kreisbogenförmige Bewegungsbahn der Bogennadel 1 hinweg ausgewölbt hat, was von der Dicke des ausgewölbten Nähgutes und dem Abstand abhängt, bis auf welchen sich der Stoffbeuger 3 der Bewegungsbahn der Bogennadel 1 nähert, wenn er mittels der Antriebswelle 11 über den Träger 15 in Richtung des Pfeils 8 verschwenkt wird. Das Nähgut wird besonders sicher gehalten, weil der Spalt zwischen den beiden das Nähgut beiderseits des Stoffbeugers 3 mittels der Anpreßhebel 44 gegen die Stichplatte 2 drückenden Transportbänder 4 verhältnismäßig eng ist.During sewing, the conveyor belts 4 move the sewing material step by step in the direction of the arrows 10 and the fabric flexor 3 bulges the sewing material after each feed step through a slot 50 of the needle plate 2 running in the sewing material advancing direction 10, after which the curved needle 1 pierces the bulging sewing material, and although the deeper, the further the fabric flexor 3 has bulged the sewing material over the circular path of movement of the curved needle 1, which depends on the thickness of the bulging sewing material and depends on the distance up to which the fabric flexor 3 approaches the path of movement of the curved needle 1 when it is pivoted by means of the drive shaft 11 via the carrier 15 in the direction of arrow 8. The sewing material is held particularly securely because the gap between the two conveyor belts 4 pressing the sewing material on both sides of the fabric flexor 3 by means of the pressing lever 44 against the needle plate 2 is relatively narrow.

Zur Einstellung der Einstichtiefe der Bogennadel 1 in das vom Stoffbeuger 3 ausgewölbte Nähgut ist der Stofftragarm 5 bezüglich des Kopfes der Blindnähmaschine derart verstellbar, daß sich der für die jeweils gewünschte Einstichtiefe unter Berücksichtigung der normalen Dicke des jeweiligen Nähguts erforderliche Abstand ergibt, bis auf welchen sich der Stoffbeuger 3 beim Verschwenken in Richtung des Pfeils 8 zusammen mit dem Träger 15 in der gegenseitigen Stellung gemäß Fig. 2 der Bewegungsbahn der Bogennadel 1 nähern kann. Die eingestellte Einstichtiefe wird auch dann beibehalten, wenn beim Nähen eine Nähgutverdickung, wie beispielsweise eine Quernaht, in den Bereich des Stoffbeugers 3 gelangt, weil dieser dann aus der Stellung gemäß Fig. 2 bezüglich des Trägers 15 entsprechend weit in Richtung auf die Stellung gemäß Fig. 3 bezüglich des Trägers 15 entgegen der Wirkung der Drehfeder 25 verschwenkt, die eine sehr flache Kennlinie aufweist und deren Vorspannung durch entsprechende Einstellung ihres Halters 33 bezüglich der Antriebswelle 11 des Stoffbeugers 3 auf das Nähgut abgestimmt wird.To adjust the penetration depth of the curved needle 1 into the material bulged by the fabric flexor 3, the fabric support arm 5 can be adjusted with respect to the head of the blind sewing machine in such a way that the distance required for the desired penetration depth, taking into account the normal thickness of the respective sewing material, is obtained, up to which there is the fabric flexor 3 when pivoting in the direction of arrow 8 together with the carrier 15 in the mutual position according to FIG. 2 can approach the path of movement of the bow needle 1. The set penetration depth is maintained even when a thickening of the material, such as a transverse seam, comes into the area of the fabric flexor 3 because this then moves from the position according to FIG. 2 with respect to the carrier 15 correspondingly far towards the position according to FIG 3 pivoted with respect to the support 15 against the action of the torsion spring 25, which has a very flat characteristic curve and the pretension of which is matched to the material to be sewn by correspondingly adjusting its holder 33 with respect to the drive shaft 11 of the fabric flexor 3.

In Fig. 1 bis 3 ist der Stofftragarm 5 der Blindnähmaschine in derjenigen Stellung bezüglich ihres Kopfes wiedergegeben, in welcher die beiden Transportbänder 4 für das Nähgut im Bereich der Anpreßhebel 44 unmittelbar an der Stichplatte 2 anliegen und der geringstmögliche Abstand des Stoffbeugers 3 von der Bewegungsbahn der Bogennadel 1 gleich Null ist. Der Träger 15 und die Antriebswelle 11 des Stoffbeugers 3 sind in derjenigen Stellung veranschaulicht, welche sie am Ende der Schwenkbewegung in Richtung des Pfeils 8 und zu Beginn der Schwenkbewegung in Richtung des Pfeils 9 einnehmen.1 to 3, the fabric support arm 5 of the blind sewing machine is shown in the position with respect to its head in which the two conveyor belts 4 for the material to be sewn in the area of the pressure lever 44 lie directly on the needle plate 2 and the smallest possible distance of the fabric flexor 3 from the movement path the bow needle 1 is zero. The carrier 15 and the drive shaft 11 of the fabric flexor 3 are illustrated in the position which they assume at the end of the pivoting movement in the direction of the arrow 8 and at the beginning of the pivoting movement in the direction of the arrow 9.

Die Blindnähmaschine nach Fig. 4 und 5 unterscheidet sich im wesentlichen nur dadurch von derjenigen nach Fig. 1 bis 3, daß ein zweiter Stoffbeuger 3' vorgesehen ist, welcher hinsichtlich Ausbildung, Anordnung und Funktionsweise mit dem ersten Stoffbeuger 3 identisch ist, abgesehen davon, daß die Antriebswelle 11', der Träger 15', der Zapfen 24' und die Drehfeder 25' des zweiten Stoffbeugers 3' spiegelbildlich zu der Antriebswelle 11, dem Träger 15, dem Zapfen 24 und der Drehfeder 25 des ersten Stoffbeugers 3 ausgebildet und angeordnet sind, ebenso wie der Halter 33' für die Drehfeder 25' des zweiten Stoffbeugers 3' zu dem Halter 33 für die Drehfeder 25 des ersten Stoffbeugers 3. Die beiden hohlen Antriebswellen 11 und 11' erstrecken sich also aufeinander ausgerichtet beiderseits des Stoffbeugerpaares 3, 3', und zwar jeweils vom Träger 15 bzw. 15' des zugehörigen Stoffbeugers 3 bzw. 3' weg. Beim Nähen werden die beiden in dem wiederum verhältnismäßig engen Spalt zwischen den beiden Transportbändern 4 sehr dicht nebeneinander angeordneten Stoffbeuger 3 und 3' abwechselnd wirksam, um das Nähgut in die Bewegungsbahn der Bogennadel 1 der Blindnähmaschine auszuwölben.The blind sewing machine according to FIGS. 4 and 5 differs essentially only from that according to FIGS. 1 to 3 in that a second fabric flexor 3 ' is provided, which is identical in design, arrangement and mode of operation with the first fabric flexor 3, apart from the fact that the drive shaft 11 ', the carrier 15', the pin 24 'and the torsion spring 25' of the second fabric flexor 3 'mirror image of the drive shaft 11, the carrier 15, the pin 24 and the torsion spring 25 of the first fabric flexor 3 are formed and arranged, as is the holder 33 ′ for the torsion spring 25 ′ of the second fabric flexor 3 ′ to the holder 33 for the torsion spring 25 of the first fabric flexor 3 The two hollow drive shafts 11 and 11 'thus extend aligned with one another on both sides of the pair of fabric flexors 3, 3', each away from the carrier 15 or 15 'of the associated fabric flexor 3 or 3'. When sewing, the two in the again relatively narrow gap between the two conveyor belts 4 very close to each other fabric flexors 3 and 3 'take effect alternately to bulge the material into the path of movement of the curved needle 1 of the blind sewing machine.

Die hohle Antriebswelle 11' des zweiten Stoffbeugers 3' ist in einem Support 51 drehbar gelagert und über einen Zahnriementrieb mit einer weiteren Antriebswelle 52 verbunden, welche parallel zu den beiden hohlen Antriebswellen 11 und 11' angeordnet ist. Der Zahnriementrieb besteht aus einem auf der hohlen Antriebswelle 11' befestigten Zahnriemenrad 53, einem auf der zusätzlichen Antriebswelle 52 befestigten Zahnriemenrad 54 und einem endlosen Zahnriemen 55, welcher die beiden Zahnriemenräder 53 und 54 umschlingt. An dem dem Zahnriementrieb abgewandten Ende ist die weitere Antriebswelle 52 mit einem Arm 12' versehen, welcher mittels eines Bolzens 13' an einer Stange 14' angelenkt ist, durch welche die Antriebswelle 52 über den Arm 12' hin- und hergeschwenkt werden kann. Auf diese Weise können also die beiden Stoffbeuger 3 und 3' von derselben Seite her angetrieben werden, nämlich der in Fig. 4 rechten und dem freien Ende des Stofftragarms 5 abgewandten Seite her.The hollow drive shaft 11 'of the second fabric flexor 3' is rotatably supported in a support 51 and connected via a toothed belt drive to a further drive shaft 52 which is arranged parallel to the two hollow drive shafts 11 and 11 '. The toothed belt drive consists of a toothed belt wheel 53 fastened on the hollow drive shaft 11 ', a toothed belt wheel 54 fastened on the additional drive shaft 52 and an endless toothed belt 55 which loops around the two toothed belt wheels 53 and 54. At the end facing away from the toothed belt drive, the further drive shaft 52 is provided with an arm 12 ', which is articulated by means of a bolt 13' on a rod 14 ', by means of which the drive shaft 52 can be pivoted back and forth over the arm 12'. In this way, the two fabric flexors 3 and 3 'can be driven from the same side, namely the right side in FIG. 4 and the free end of the fabric support arm 5.

Der Support 51 ist am Stofftragarm 5 schwenkbar gelagert und auf der dem Zahnriementrieb abgewandten sowie dem Stoffbeugerpaar 3, 3' zugewandten Seite mit einer hohlen Achse 56 versehen. In deren Bohrung 57, welche auch durch den Support 51 hindurchgeführt ist und sich quer durch denselben hindurch erstreckt, ist die zweite Antriebswelle 52 für den zweiten Stoffbeuger 3' drehbar gelagert. Die Achse 56 ist ihrerseits in einer Längsbohrung 58 des Stofftragarms 5 drehbar gelagert.The support 51 is pivotably mounted on the fabric support arm 5 and is provided with a hollow axis 56 on the side facing away from the toothed belt drive and facing the pair of fabric flexors 3, 3 '. In its bore 57, which is also passed through the support 51 and extends transversely therethrough, is the second drive shaft 52 for the second fabric flexor 3 ' rotatably mounted. The axis 56 is in turn rotatably mounted in a longitudinal bore 58 of the fabric support arm 5.

Gemäß Fig. 5 ist der Stofftragarm 5 am Gehäuse 59 der Blindnähmaschine um eine Achse 60 schwenkbar gelagert und durch eine Schraubenzugfeder 61 in die dargestellte Nähstellung belastet, in welcher sich der Stofftragarm 5 über eine erste Einstellschraube 62 am Gehäuse 59 abstützt, die in einer nach unten ragenden Zunge 63 der vorderen Längswand 64 des Stofftragarms 5 verschraubbar ist. Die Achse 60 verläuft parallel zu den Antriebswellen 11, 11' und 52 für die Stoffbeuer 3 sowie 3' und die Schraubenzugfeder 61 greift einerseits an der Zunge 63 sowie andererseits am Gehäuse 59 an. Der bezüglich des Stofftragarms 5 um die gemeinsame Längsachse der zweiten Antriebswelle 52 für den zweiten Stoffbeuger 3' und der zu derselben koaxialen eigenen Lagerachse 56 verschwenkbare Support 51 der ersten Antriebswelle 11' für den zweiten Stoffbeuger 3' ist durch eine Schraubendruckfeder 65 belastet, welche sich einerseits an einem nach unten ragenden Vorsprung 66 des Supportes 51 sowie andererseits am Stofftragarm 5 oder am Gehäuse 59 der Blindnähmaschine abstützt und den gemäß Fig. 4 neben dem Arm 12' der zweiten Antriebswelle 52 an der Lagerachse 56 vorgesehenen Vorsprung 66 gegen eine zweite in der Zunge 63 des Stofftragarms 5 verschraubbare Einstellschraube 67 drückt. Auf diese Weise ist es also möglich, die Einstichtiefe der Bogennadel 1 in das vom ersten Stoffbeuger 3 ausgewölbte Nähgut unabhängig von der Einstichtiefe der Bogennadel 1 in das vom zweiten Stoffbeuger 3' ausgewölbte Nähgut einzustellen, und zwar mittels der ersten Einstellschraube 62 bzw. der zweiten Einstellschraube 67 durch entsprechendes Verstellen des Stofftragarms 5 bezüglich des Gehäuses 59 der Blindnähmaschine bzw. des Supportes 51 bezüglich des Stofftragarms 5.5, the fabric support arm 5 is pivotally mounted on the housing 59 of the blind sewing machine about an axis 60 and is loaded by a tension spring 61 into the sewing position shown, in which the fabric support arm 5 is supported on the housing 59 via a first adjusting screw 62, which is supported in one after tongue 63 projecting below the front longitudinal wall 64 of the fabric support arm 5 can be screwed. The axis 60 runs parallel to the drive shafts 11, 11 'and 52 for the textile beers 3 and 3' and the helical tension spring 61 engages on the one hand on the tongue 63 and on the other hand on the housing 59. The support 51 of the first drive shaft 11 'for the second fabric flexor 3', which can be pivoted about the common longitudinal axis of the second drive shaft 52 for the second fabric flexor 3 'about the common longitudinal axis of the second drive shaft 52', and the support 51 of the first drive shaft 11 'for the second fabric flexor 3', which is coaxial with the same, is loaded by a helical compression spring 65, which is self-supporting is supported on the one hand on a downwardly projecting projection 66 of the support 51 and on the other hand on the fabric support arm 5 or on the housing 59 of the blind sewing machine and the projection 66 provided on the bearing axis 56 alongside the arm 12 ′ of the second drive shaft 52 according to FIG. 4 against a second one in the Tongue 63 of the fabric support arm 5 presses the screwing adjusting screw 67. In this way, it is possible to set the penetration depth of the curved needle 1 into the sewing material bulged by the first fabric flexor 3 independently of the penetration depth of the curved needle 1 into the sewing material bulged by the second fabric flexor 3 ', by means of the first adjusting screw 62 or the second Adjusting screw 67 by correspondingly adjusting the fabric support arm 5 with respect to the housing 59 of the blind sewing machine or the support 51 with respect to the fabric support arm 5.

Es ist durchaus möglich, den Stoffbeuger 3 bzw. die beiden Stoffbeuger 3 und 3' mit einem oder je einem Anschlag an der Stichplatte 2 zusammenwirken zu lassen oder mit einem bzw. je einem Nähgutabtaster zu versehen. Auch können statt der beiden Transportbänder 4 andere Vorschuborgane für das Nähgut vorgesehen werden.It is entirely possible to let the fabric flexor 3 or the two fabric flexors 3 and 3 'interact with one or each stop on the needle plate 2 or to provide one or each with a sewing material scanner. Instead of the two conveyor belts, 4 other feed elements can also be provided for the sewing material.

Claims (15)

  1. Blind-stitch sewing machine with a plate-shaped fabric bulger (3) for bulging out the material being sewn into the arcuate path of movement of the curved needle (1) which extends along a plane perpendicular to the path of movement of the needle and can be swung to and fro in the plane by means of a drive shaft (11) extending perpendicular to it, the fabric bulger (3) being pivotally mounted in a slot (19) in a carrier (15) projecting from the drive shaft (11), about an axis (18) parallel to the drive shaft (11), and being urged away from the drive shaft (11) by a spring (25), characterised in that
    a) the drive shaft (11) is made hollow and has a bore (23) opening into the slot (19) in the carrier (15) for the fabric bulger (3),
    b) a torsion spring (25) is provided for acting on the fabric bulger (3) and is arranged in the bore (23) in the drive shaft (11),
    c) a cylindrical pin (24) is rotatably mounted in the bore (23) of the drive shaft (11) and has one end projecting into the slot (19) in the carrier (15) and is provided at the end with a radially projecting cam (26) for engaging the fabric bulger (3), and
    d) the torsion spring (25) is secured against rotation on the one hand to the pin (24) at its end furthest from the cam (26) and on the other hand to the drive shaft (11).
  2. Blind-stitch sewing machine according to claim 1, characterised in that the fabric bulger (3) has an opening (39) to receive the cam (26) and the corresponding end of the pin (24), the opening being of a shape such that there results a nose (40) for engagement by the cam (26) and two stop edges (41,42) which, in co-operation with the end of the pin (24), define the range of pivoting of the fabric bulger (3) in the slot (19) in its carrier (15).
  3. Blind-stitch sewing machine according to claim 1 or 2, characterised in that the carrier (15) for the fabric bulger (3) comprises two parallel plates (16,17) which are connected together by a number of pins (18) and extend perpendicular to the drive shaft (11), the plate (17) defining the slot (19) for receiving the fabric bulger (3) on the side which is towards the drive shaft (11) being arranged on the adjacent end of the drive shaft (11) and the fabric bulger (3) being pivotally mounted on one of the pins (18).
  4. Blind-stitch sewing machine according to claim 3, characterised in that the two plates (16,17) have a common triangular outline and are connected together at their corners by respective pins (18) as well as being arranged substantially concentrically with respect to the drive shaft (11), and the pin (18) serving for mounting the fabric bulger (3) extending on the side of the drive shaft (11) which is towards the path of movement of the needle (1).
  5. Blind-stitch sewing machine according to claim 1, 2, 3 or 4, characterised in that the torsion spring (25) is secured against rotation at that end (30) furthest from the pin (24) to a cylindrical retainer (33) which is rotatable in the bore (23) of the drive shaft (11) for adjusting the pre-loading of the spring (25) and can be secured to the drive shaft (11) in different angular positions.
  6. Blind-stitch sewing machine according to claim 5, characterised in that the retainer (33) is provided with four circumferentially uniformly distributed longitudinal grooves (34) for engagement by a radial clamping screw (35) on the drive shaft (11).
  7. Blind-stitch sewing machine according to one of the foregoing claims, characterised in that the torsion spring (25) is in the form of a coil spring of which the two ends (29,30) extending transverse to the longitudinal axis of the spring are received in a transverse slot (31) in the pin (24) and respectively in a transverse slot (32) in a or the retainer (33) arranged in the bore (23) in the drive shaft (11).
  8. Blind-stitch sewing machine according to one of the foregoing claims, characterised by two fabric bulgers (3,3') which are arranged in mirror image fashion so that their two mutually aligned hollow drive shafts (11,11') with a respective torsion spring (25 and 25') and pin (24 and 24') extend on both sides of the pair of fabric bulgers (3,3') and in fact respectively away from the carrier (15 or 15') of the associated fabric bulger (3 or 3').
  9. Blind-stitch sewing machine according to claim 8, characterised in that for driving the two fabric bulgers (3,3') from the same side for one fabric bulger (3') a second drive shaft (52) is provided, which extends parallel to the two hollow drive shafts (11,11') and is connected through a toothed belt drive (53,54,55) to the hollow drive shaft (11') of the fabric bulger (3').
  10. Blind-stitch sewing machine according to one of the foregoing claims, characterised in that the drive shaft (11) or all the drive shafts (11,11',52) is or are rotatably mounted in a fabric supporting arm (5) which is adjustable in relation to the path of movement of the needle (1) for adjusting the depth of stitching of the needle (1) into the material being sewn bulged up by the fabric bulger (3) or by the fabric bulgers (3,3').
  11. Blind-stitch sewing machine according to claim 10, characterised in that the fabric supporting arm (5) is spring-loaded into the sewing position and supported by means of an adjusting screw (62).
  12. Blind-stitch sewing machine according to claim 10 or 11 in conjunction with claim 8 or 9, characterised in that, for the separate adjustment of the stitching depth of the needle (1) in the material bulged up by one or the other fabric bulger (3 or 3'), the hollow drive shaft (11') of a fabric bulger (3') is rotatably mounted in a support (51) which is adjustable on the fabric supporting arm (5) in relation to the path of travel of the needle (1).
  13. Blind-stitch sewing machine according to claim 12, characterised in that the support (51) is spring-loaded and supported on the fabric supporting arm (5) through an adjusting screw (67).
  14. Blind-stitch sewing machine according to claim 12 or 13 in conjunction with claim 9, characterised in that the hollow drive shaft (11') connected to the second drive shaft (52) is mounted rotatably in the support (51) and the support (51) is mounted pivotally on the fabric supporting arm (5) about an axis (56) which extends co-axially with respect to the second drive shaft (52).
  15. Blind-stitch sewing machine according to one of the foregoing claims, characterised in that the fabric bulger (3) or the pair of bulgers (3,3') is arranged between two feed belts (4) for the fabric being sewn.
EP90124188A 1990-08-03 1990-12-14 Blind stitch sewing machine Expired - Lifetime EP0469188B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4024715A DE4024715C1 (en) 1990-08-03 1990-08-03
DE4024715 1990-08-03

Publications (2)

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EP0469188A1 EP0469188A1 (en) 1992-02-05
EP0469188B1 true EP0469188B1 (en) 1994-03-09

Family

ID=6411617

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90124188A Expired - Lifetime EP0469188B1 (en) 1990-08-03 1990-12-14 Blind stitch sewing machine

Country Status (8)

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US (1) US5129339A (en)
EP (1) EP0469188B1 (en)
JP (1) JPH04240473A (en)
AT (1) ATE102665T1 (en)
DE (1) DE4024715C1 (en)
ES (1) ES2050924T4 (en)
HU (1) HUT65009A (en)
RU (1) RU2015226C1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19701341C1 (en) * 1997-01-16 1998-01-15 Strobel & Soehne Gmbh & Co J Blind stitch sewing machine
US6904853B2 (en) * 2003-09-09 2005-06-14 Ching Chi Machine Co., Ltd. Take-up cam phase adjustment structure of looper thread take-up apparatus of a sewing machine
CN106529121B (en) * 2016-09-30 2019-01-29 飞依诺科技(苏州)有限公司 The restoration methods and recovery system of ultrasonic dynamic focusing delay data

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191509134A (en) * 1915-06-22 1916-06-01 James Mcculloch Improvements in or relating to Sewing Machines especially applicable for Blind Stitch Machines.
FR21045E (en) * 1917-10-12 1920-02-19 Philippe Maurice Favre Bulle D Rotation speed indicator
US2194149A (en) * 1937-08-18 1940-03-19 Lewis Invisible Stitch Machine Blind stitch sewing machine
US2250573A (en) * 1939-07-21 1941-07-29 American Blind Stitch Machine Sewing machine construction
US2355904A (en) * 1940-06-17 1944-08-15 Us Blind Stitch Machine Corp Blind-stitch sewing machine
GB727340A (en) * 1952-12-16 1955-03-30 Us Blind Stitch Machine Corp Improvements in sewing machines
US3572269A (en) * 1969-12-03 1971-03-23 Union Special Machine Co Blindstitch sewing machine
DE2037502A1 (en) * 1970-07-29 1972-02-03 Union Special Maschinenfabrik Gmbh, 7000 Stuttgart Swivelable plunger mechanism for blind stitch sewing machines
US3747546A (en) * 1970-07-29 1973-07-24 Union Special Maschinenfab Blindstitch sewing machine
DE2736780C2 (en) * 1977-08-16 1981-11-12 Maier-Unitas GmbH, 7316 Köngen Blind stitch sewing machine
GB2119415B (en) * 1982-04-29 1985-07-10 William Arthur Allen Blind stitch sewing machine
GB2187212A (en) * 1986-02-27 1987-09-03 Textile Handling And Technolog Device for sewing materials with nap or pile

Also Published As

Publication number Publication date
JPH04240473A (en) 1992-08-27
DE4024715C1 (en) 1991-08-01
RU2015226C1 (en) 1994-06-30
EP0469188A1 (en) 1992-02-05
US5129339A (en) 1992-07-14
ES2050924T3 (en) 1994-06-01
ES2050924T4 (en) 1995-12-01
HU912591D0 (en) 1992-01-28
ATE102665T1 (en) 1994-03-15
HUT65009A (en) 1994-03-28

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