EP1354993A2 - Buttonhole sewing machine - Google Patents

Abstract

A buttonhole sewing machine includes a needle drivable via an arm shaft; table that is movable by respective drive in respective direction; and two work piece clamps having displacement drive and one of which includes a supporting plate for accommodating a work piece and a clamping plate that is mounted on the supporting plate. A buttonhole sewing machine includes a needle (7) drivable via an arm shaft (4); and an x-y table (8) that is movable by respective drive (9, 10) in respective direction; and two work piece clamps mounted for displacement one relative to the other. The work piece clamps comprise displacement drive for displacement from an initial position of spread into a final position of spread. The first work piece clamp has a supporting plate for accommodating a work piece and a clamping plate that is mounted on the supporting plate. The clamping drive actuates the clamping plate and supports itself on the supporting plate.

Description

The invention relates to a buttonhole sewing machine according to the preamble of claim 1.

From the JUKI MEB-3200 Instruction Manual No. 02 29343316 a buttonhole sewing machine of the generic type is known. she has an x-y table that uses two stepper motors as an x drive and y drive is displaceable in the vicinity plane. On the x-y table two sewing material clamps are arranged, by means of which a sewing material can be held on the x-y table. These are each by means of a Pneumatic cylinder in the vicinity plane formed by the x-y plane Movable mirror-symmetrically to a central plane in the x-direction. Both pneumatic cylinders are each in the control unit by means of one stored control command operable. Everyone is at the x-y table Side adjustment screws are provided, which are an adjustment of the spreading distance of each Material clamp from an unchangeable inner spread starting position allow in a spread end position.

With the displacement of the sewing material clamps, a pull apart, a so-called spreading, which was previously firmly clamped in the material clamps Material is reached so that the material is in a tight, level condition is spent. This allows high quality Buttonholes are created. With the spreading of the material is also achieved that there is enough space for the needle if that Buttonhole is first cut and then sewn, i.e. if the Sewing machine works in the so-called pre-cutting mode. The extent the displacement is up to 1.0 mm on each workpiece clamp, so that these can be shifted from each other by an expansion distance of up to 2.0 mm.

The amount of the spreading distance depends on how different sewing parameters the nature of the sewing material, i.e. the weaving density, the material and the like, the type of threads to be sewn, the thread tension values, the Needle size, possibly processing a gimp thread and others Parameters.

A disadvantage of this known machine is that the material clamps must be carried out very stably, because otherwise they occur due to the Would bend clamping forces. Also occur when spreading considerable frictional forces on that to perform the spreading motion serving displacement drive must be overcome.

The invention has for its object a buttonhole sewing machine of the generic type so that the at least one material clamp can be constructed as simply as possible.

This object is achieved by the features in the labeling part of claim 1 solved.

The measures according to the invention ensure that at least no forces in the guides with the sliding material clamp the material clamp is transferred to the x-y table. So it occurs no friction forces when positioning the material clamp, which counteract the displacement of the material clamp for spreading. The forces that occur when stapling a sewing material remain in the Sewing material clamp itself. This in turn has an advantageous effect on the Speed and the precision of the spreading process. Besides, can the entire spreading device is lighter, so it saves material being constructed.

Advantageous further developments result from the subclaims.

Fig. 1

eine Seitenansicht einer Knopfloch-Nähmaschine,

Fig. 2

eine Teil-Draufsicht auf einen x-y-Tisch der Nähmaschine entsprechend dem Sichtpfeil II in Fig. 1,

Fig. 3

eine Teil-Seitenansicht der Nähmaschine in vergrößerter Darstellung,

Fig. 4

eine Ansicht entsprechend der Schnittlinie IV-IV in Fig. 3,

Fig. 5

einen Teil-Querschnitt durch die Nähmaschine entsprechend der Schnittlinie V-V in Fig. 3,

Fig. 6

eine Teil-Draufsicht auf die Nähmaschine entsprechend dem Sichtpfeil VI in Fig. 3,

Fig. 7

einen vertikalen Schnitt durch die Nähmaschine entsprechend der Schnittlinie VII-VII in Fig. 6,

Fig. 8

einen perspektivisch dargestellten Teil der Knopfloch-NähMaschine einschließlich der schaltungsmäßigen Verknüpfung der verschiedenen Antriebe mit der Steuer-Einheit und der BedienEinheit,

Fig. 9

Teile der Nähmaschine in einer Draufsicht in einem gegenüber Fig. 2 vergrößerten Maßstab,

Fig.10

eine Draufsicht auf ein Nähgut-Teil mit einem Augen-Knopfloch,

Fig. 11

eine Teil-Ansicht einer weiteren Ausführungsform der Nähmaschine in gegenüber Fig. 1 vergrößertem Maßstab und in bereichsweise aufgebrochener Darstellung und

Fig. 12

eine Draufsicht auf den in Fig. 11 gezeigten Teil der Nähmaschine entsprechend der Schnittlinie XII-XII in Fig. 11.

The invention is explained in more detail below with reference to three exemplary embodiments shown in the drawing. It shows

Fig. 1

a side view of a buttonhole sewing machine,

Fig. 2

2 shows a partial top view of an xy table of the sewing machine in accordance with the arrow II in FIG. 1,

Fig. 3

a partial side view of the sewing machine in an enlarged view,

Fig. 4

3 shows a view corresponding to the section line IV-IV in FIG. 3,

Fig. 5

3 shows a partial cross section through the sewing machine according to the section line VV in FIG. 3,

Fig. 6

3 shows a partial top view of the sewing machine according to the arrow VI in FIG. 3,

Fig. 7

a vertical section through the sewing machine according to the section line VII-VII in Fig. 6,

Fig. 8

a part of the buttonhole sewing machine shown in perspective, including the circuitry connection of the different drives with the control unit and the operating unit,

Fig. 9

Parts of the sewing machine in a plan view on an enlarged scale compared to FIG. 2,

Figure 10

a plan view of a sewing material part with an eye buttonhole,

Fig. 11

2 shows a partial view of a further embodiment of the sewing machine on an enlarged scale compared to FIG. 1 and in a representation broken away in regions and

Fig. 12

11 shows a plan view of the part of the sewing machine shown in FIG. 11 along the section line XII-XII in FIG. 11.

1 can be seen, a buttonhole sewing machine is C-shaped, d. H. it has an upper arm 1, a lower, housing-like Base plate 2 and a connecting both, approximately vertical Stand 3 on. An arm shaft 4 is mounted in the arm 1 in the usual way, which can be driven by a drive motor 5 only indicated in FIG. 8. From the arm shaft 4, the drive is a vertical one in the usual way Slidable needle bar 6 with a needle 7 and a swing drive derived for this.

An x-y table 8 is arranged on the base plate 2, which means that it is by one in two horizontal coordinate directions, namely the x direction and the y-direction, movable cross slide. The The x-y table 8 is designed in the usual way, for example from the DE 198 07 771 A1 (corresponding to US Pat. No. 6,095,066) is known. The drive of the x-y table 8 takes place by means of drives indicated only in FIG. 8, namely an x drive 9 and a y drive 10, which are positionable electric motors, usually stepper motors, but also controllable DC motors.

A two-part support plate 11a, 11b is arranged on the x-y table 8. The left partial support plate 11a - seen in the y direction - is by means of positioning devices 12, 12 'fixed on the x-y table 8. The positioning devices 12, 12 'are through recesses formed in the partial support plate 11a and fixedly arranged on the x-y table 8 pins. The Part support plate 11a is thus immovable relative to the x-y table 8. In contrast, the right partial support plate - seen in the y direction 11b is supported on the x-y table 8 so as to be displaceable in the x direction. The tops the partial support plates 11a, 11b lie in a common x-y plane.

On each partial support plate 11a or 11b there is a material clamp 13a or 13b attached, each one on the respective partial support plate 11a or 11b attached partial platen 14a or 14b, which a clamping plate 15a or 15b is assigned. The clamping plates 15a, 15b are attached to double-arm bearing levers 16a, 16b.

Each double-arm bearing lever 16a, 16b is by means of a pivot bearing 17a, 17b stored in a drive and bearing housing 18a, 18b. This is screwed tightly with screws 19 to the underside of the support plate 11b, using both parts at their interface a liquid sealant, not shown, compressed airtight with each other are connected. Only the sewing material clamp 13b is described in more detail below.

In the housing 18b is a continuous, open at the bottom and through the top Support plate 11b closed cylinder space 20 formed in the one Piston 21 is arranged to be moved up and down in a sealed manner. That piston 21 has a piston rod projecting downward from the cylinder space 20 22, which by means of a joint 23 on the facing end 24 of the bearing lever 16b is articulated. In addition to the cylinder space 20 is a Compressed air channel 25 formed in the housing 18b, which is on the top of the Housing 18b by means of an overflow channel 26 with the cylinder space 20 is connected. At the bottom of the housing 18b opens into the Compressed air channel 25, a compressed air line 27, which is connected to an electro-mechanical actuatable 3/2-way valve 28 ', a so-called solenoid valve, connected is. The unit described forms as one-sided Pneumatically actuated piston-cylinder unit with a clamping drive 28b.

In the housing 18b there is also a compressed air duct 25 Bore 29 formed in which a preloaded tension spring 30 is arranged which is by means of a retaining pin 31 on the top of the housing 18b and is fixed on the bearing lever 16b by means of a further retaining pin 32. The lower lever section 33 becomes by means of the prestressed tension spring 30 between the pivot bearing 17b and the joint 23 upwards, that is to say Clamp drive 28b pulled out so that the upper lever portion 34 of the Bearing lever 16b is pivoted upwards, i.e. the clamping plate 15b is lifted off the support plate 11b. If on the other hand via the compressed air line 27, the compressed air duct 25 and the overflow duct 26 Compressed air flows into the space 20 above the piston 21, then the Piston 21 together with the lower lever section 33 against the force of Tension spring 30 shifted downward so that the upper lever section 34 is pivoted with the clamping plate 15b to the support plate 11b, whereby a possibly existing material part 35 is held clamped becomes.

In the lower lever section 33 one against the housing 18b is in contact coming set screw 36 arranged by means of which are adjusted can by which way the clamping plate 15b from the support plate 14b is raised.

By arranging the clamping drive 28b between the bearing lever 16b and the support plate 11b ensures that the in the material clamp 13b acting forces remain within the bracket 13b, that is not yet act on the x-y table 8. The other support plate 11a with material clamp 13a is configured in the same way.

The partial support plates 11a, 11b are symmetrical to one in a zero position Center plane 37 positioned so that opposite edges 38a, 38b of the support plates 14a, 14b a distance z of between them, for example 6 millimeters. In this level 37 is also on the Base plate 2 of the sewing machine a stationary knife 39 for cutting a buttonhole 40 arranged. This knife 39 is part of a cutting device 41, to which also belongs an anvil 42, which by means of a Cutting drive 43 can be moved up and down on the underside of the arm 1 is appropriate.

An embodiment for a displacement drive for the partial support plate 11b emerges from FIGS. 6, 7. The partial support plate 11b is directly on the x-y table 8 slidably guided. Below the support plate 11b is a pneumatically actuated displacement drive 44 attached to the x-y table 8. It is coupled to a lever arrangement 45 which controls the displacement movements transfers to the partial support plate 11b. Here are a first Lever 46 and a second lever 47, each as a double-armed lever are configured, pivotably mounted in bearings 48 in their central region, which are formed on the x-y table 8. Cover the levers 46, 47 each other at the facing ends, each extending in the longitudinal direction the lever 46, 47 extending, U-shaped recesses (Fig. 6) exhibit. You are penetrated here by a bolt 49 on the Drive 44 arranged perpendicular to the main direction of the levers 46, 47 is provided. The bolt 49 is on a piston rod 50 of the drive 44 attached, which in turn connected to the piston 51 of the drive 44 is. The latter is displaceable in the interior space 52 of the housing 53 of the drive 44 arranged. A compressed air supply opens into space 52 54 a, in which there is an electro-mechanically operated 3/2-way valve 44 ', again a so-called solenoid valve.

At the opposite ends, the levers 46, 47 are each with one Pin 55 provided, the one pin 55 into an elongated hole Recess 56 and the other pin 55 in a circular recess 56 'engages in the partial support plate 11b. At the pin 55 adjacent end of the second lever 47 also engages a preloaded one Tension spring 57, which in turn is connected to the x-y table 8.

If the displacement drive 44 is pressurized with compressed air, then the pin 49 with the two ends of the levers coupled to it 46, 47 shifted against the x-direction, with the result that the partial support plate 11b is shifted in the x direction, namely against the Preload force of the tension spring 57. When the slide drive is relieved of pressure 44, the partial support plate 11b is opposed by the tension spring 57 x direction reset.

On the x-y table 8 there is a first set screw 58 as an adjustable stop attached by a first end position of the partial support plate 11b in the x direction can be limited and adjusted. On the slide drive 44 a second set screw 59 is attached as an adjustable stop, through which the return path of the piston 51 in the x direction is limited can, which in turn a second end position of the partial support plate 11b is limited against the x direction. By the two adjusting screws 58, 59 are thus the end positions and thus the displacement path of the partial support plate 11b set overall.

The partial support plate 11b made of steel is thereby on the x-y table 8 secured in the vertical direction that they have a retaining lug on one side 60b engages under, while on the side adjacent to the tension spring 57 is held by permanent magnets 61. In the same way the Part support plate 11a by a retaining lug 60a and corresponding permanent magnets held on the x-y table 8.

The sewing machine is provided with a control unit 62, via which the x drive 9, the y drive 10, the valve 44 'for the displacement drive 44, the drive motor 5 of the arm shaft 4, the clamping drives 28a, 28b and the cutting drive 43 can be controlled. The control unit 62 has a storage part 63. Furthermore, it is an operating unit 64 with a Input keyboard 65 and a display 66 assigned.

The programs and data are stored in the memory part 63, which one too producing buttonhole seam 67 concern. Furthermore, values for the Distance z stored, that to be taken by the partial support plate 11b Spread end positions are assigned.

Before starting a sewing operation, the x-y table 8 is in accordance with the im Storage part 63 stored data in the usual manner by means of as Stepper motors trained drives 9, 10 brought into the zero position the middle plane 37 also the needle 7 in its vertical middle position receives. Such zero position adjustments are in sewing control technology generally customary and therefore require no further explanation. The operator selects by operating the control unit 64 accordingly a certain type of buttonhole 40 with buttonhole seam 67 out.

Then the operator performs an adjustment process for the Spreading movement. For this purpose, actuation takes place on the operating unit 64 a certain switch of an input keyboard 65, with which the partial support plate 11b alternately in the first or second end position can be. This makes it possible for the unloaded, ie force-free set screw 58 or 59. This process is repeated repeated until at the edges 38a, 38b of the support plates 14a, 14b specified values of the distance z can be measured using a caliper are.

With the setting process, the operator carries out one Transmission of predetermined spreading data to the partial support plate 11b positioning displacement drive 44. In reverse But it is also possible to use empirically determined spread data, i.e. measurements for to store the end positions of the partial support plate 11b in the storage part 63.

After completing the setting process, press a switch the control unit 64 by correspondingly controlling the displacement drive 44 the partial support plate 11b with the workpiece clamp 13b in one Spread-starting position spent in which the partial openings 68a, 68b delimit Longitudinal edges 38a, 38b of the clamping plates 15a, 15b a distance a, corresponding to the distance z from each other, that of the total width b the buttonhole seam 67 plus a distance c of, for example 0.5 mm between the buttonhole seam 67 and each adjacent Longitudinal edge corresponds to 38a or 38b.

The operator now uses the control unit 64 or automatically the sewing material clamps according to the saved sewing program 13a, 13b opened, and the operator can the sewing part Place 35 on the support plates 14a, 14b and align. Subsequently the sewing material clamps 13a, 13b are closed by appropriate ones Control of valves 28 'for actuating the clamping drives 28a and 28b, so that the material part 35 in the two material clamps 13a, 13b is bracketed. Then takes place fully automatically using of the shift drive 44 controlled by the control unit 62 Moving the partial support plate 11b with the material clamp 13b around the spread path d in the x direction resulting from the set end positions. At the same time or immediately thereafter, the x-y table 8 is turned around travel a path d / 2 in the opposite direction so that the two Plates 14a, 14b are again mirror-symmetrical to the center plane 37 are in their spread-end position. The partial openings 68a, 68b are located thereby again mirror-symmetrical to the central plane 37. The parenthesized and now spread material part 35 is in the for Execution of the sewing process precisely defined position under the needle 6. In Fig. 9, the clamping plate 15b is extended in its starting position and dashed in their spread position after moving the partial support plate 11b by the spread path d, but before the compensation by the backward movement of the x-y table 8 by half a spreading distance d / 2 shown. Cutting the buttonhole 40 using the knife 39 can be done before sewing the buttonhole 40 or after sewing. As can be seen in FIG. 10, the buttonhole seam 67 is a conventional bead seam, by a corresponding needle swing drive of the needle bar 6 is generated. It can also affect the buttonhole eye 70 opposite end of the buttonhole seam 67 a not shown End bartack to be sewn.

An alternative embodiment for the displacement of the support plate 11b show the figures 11 and 12. Here is on the x-y table 8 over a Ball linear guide 71 a support plate 72 slidably supported the support plate 11b carries. The support plate 72 with the partial support plate 11b is by means of a displacement drive 73 designed as a stepper motor in the x direction displaceable. This drive 73 is attached to the x-y table 8 and acts via an eccentric 75 and a sliding block sliding connection 76 cooperating therewith the support plate 72, so that maximum displacements of the support plate 72 in the x direction possible according to the double eccentricity of the eccentric 75 are. The displacement paths are also in the range of about 2 mm. The spreading process proceeds as described above; only the spread path d is also determined by data stored in the memory section 63 controlled.

Claims (4)

Buttonhole sewing machine, with a needle (7) which can be driven via an arm shaft (4), with an xy table (8), which can be displaced in the x direction by means of an x drive (9) and in the y direction by means of a y drive, which carries a first and a second workpiece clamp (13a, 13b) which is displaceable relative to one another and which has a displacement drive (44, 73) for displacing the sewing material clamps (13a, 13b) relative to one another from an expansion starting position by an expansion distance (d) into an expansion end position, characterized in that at least the first material clamp (13b) has a support plate (11b) for receiving a material part (35) and a clamping plate (15b) mounted on the support plate (11b) and
that a clamping drive (28b) for actuating the clamping plate (15b) is supported on the support plate (11b). Buttonhole sewing machine according to claim 1, characterized in that the clamping drive (28b) is formed by a pneumatic piston-cylinder drive. Buttonhole sewing machine according to claim 2, characterized in that the clamping drive (28b) has a drive housing (18b) attached to the support plate (11b) with a cylinder space (20) in which one with a bearing lever (16b ) connected piston (21) is arranged displaceably, the bearing lever (16b) carrying the clamping plate (15b). Buttonhole sewing machine according to claim 2, characterized in that the clamping drive (28b) is designed as a piston-cylinder drive which can be acted upon on one side.

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