EP1722021B1 - Button hole sewing machine - Google Patents

Abstract

In a buttonhole sewing machine with a buttonhole cutting device (13) including a cutting unit with a knife (45) and an upper cutting block (15) having an anvil (64) to be moved downwards against the knife, the cutter unit has two parallel knives (45, 46) and a drive for displacing the knives (transverse to the needle and anvil movement directions) between two end mountings, at each of which only one of the knives is contacted with anvil surface. A buttonhole sewing machine comprises an upper arm (1) connected to a base plate (2) by a stand (3), a movable needle and sewn article clamp(s) (9b) movable in the y-direction. A buttonhole cutting device (13), located behind the clamp (as seen in the y-direction from the needle), includes: a cutting unit (14) with a knife (45); an upper cutting block (15) having an anvil (64) with a counter-surface for the knife; a cutting drive (16), for moving the block downward in the vertical z-direction against the knife; and a drive for displacing the anvil in the y-direction relative to the knive. The novel feature is that the cutter unit has two parallel knives (45, 46) and a drive for displacing the knives in the x-direction (transverse to the y- and z-directions) between two end mountings, at each of which only one of the knives is contacted with the counter-surface of the anvil.

Description

State of the art

From the DE 103 04 821 B3 Such a buttonhole sewing machine is known which comprises a knife having a straight cutting part and at each end of this straight cutting part an eye cutting part. The one anvil as counter knife with a counter surface for the knife having upper cutting block is infinitely variable in the longitudinal direction, ie in the y-direction, the sewing machine so that different types and lengths of buttonholes can be cut. Eye buttonholes can be cut with straight sections of different lengths. Furthermore, only straight buttonholes, so simple buttonholes of different lengths, ie buttonholes without eye hole, can be cut. In addition, the cutting is only feasible by eye holes. In principle, the knife or the cutting block can be adjusted in the y-direction; but explained in more detail is merely an adjustment of the cutting block with anvil in the y-direction by means of a self-adjusting motor arranged in the sewing machine via a relatively complex linkage with slide guides in the y- and z-direction. This embodiment is advantageous for many applications; but it is structurally complex.

From the WO 01/42550 A is a buttonhole sewing machine with a base plate, an upper arm and the arm connecting to the base plate stand known. It is a buttonhole cutting device provided, which is arranged behind the needle in a y-direction seen from the needle. Furthermore, a knife unit with two knives is arranged on the arm. A knife is used to perform a circular eye-cut; the other knife is used to make a straight cut. On the base plate, a support for supporting a work piece is formed, in which a pure eye hole or eye buttonhole is sewn. This edition is formed with slots for receiving the aforementioned knife. If only a circular eyelet (Schnürloch) is to be cut, then only the leading punch can be used. In the other case, first the punching knife and then the knife penetrates to make a straight cut.

From the US 6,047,654 A (corresponding DE 198 45 624 C1 ) is a piping cutting known.

From the U.S. Patent 2,247,305A a device for the production of buttonholes is known. Here, a knife interacts with a cutting block, wherein the engagement length, ie the overlap of cutting block and knife, is adjustable so that variable length buttonhole cuts can be made. This embodiment is complicated and moreover not sufficiently flexible.

From the DE 100 85 290 T1 For example, a buttonhole sewing machine is known which has a cutting device for cutting eye buttonholes. Here, cuts of different shape and size can be generated by a plurality of cutting movements of a knife.

task

The invention has the object of providing a buttonhole sewing machine of the generic type so that different buttonholes can be cut in a structurally simple manner.

This object is achieved by the features in the characterizing part of claim 1. By the measures according to the invention it is possible to cut different types of buttonholes. Due to the transverse displaceability of the two knives in the x direction, different knives can be brought into engagement with the mating face of the anvil of the cutting block. Due to the longitudinal displaceability of the anvil in the y-direction, in turn, different areas of the respective knife can be brought into engagement with the counter-surface of the anvil.

The claims 2 and 3 give advantageous embodiments of the two knives again.

The claims 4 and 5 show again that the blade unit on the one hand and the cutting block on the other hand each formed as a compact units in which the respective drives are structurally integrated.

The claims 6 and 7 give particularly simple and reliable embodiments of the drives for moving the knife or the anvil again.

The claims 8 to 11 give advantageous structural details again.

embodiment

Fig. 1

eine Längsansicht einer Augen-Knopfloch-Nähmaschine mit einer Knopfloch-Schneid-Vorrichtung,

Fig. 2

einen horizontalen Teil-Schnitt durch die Nähmaschine entsprechend der Schnittlinie II-II in Fig. 1 in gegenüber Fig. 1vergrößertem Maßstab,

Fig. 3

eine perspektivische Ansicht einer Messer-Einheit,

Fig. 4

eine Ansicht der Messer-Einheit gemäß dem Sichtpfeil IV in Fig. 5,

Fig. 5

eine Seitenansicht der Messer-Einheit gemäß dem Sichtpfeil V in Fig. 4,

Fig. 6

einen vertikalen Querschnitt durch die Messer-Einheit gemäß der Schnittlinie VI-VI in Fig. 5,

Fig. 7

eine perspektivische Ansicht eines Schneidblocks,

Fig. 8

eine Seitenansicht des Schneidblocks gemäß dem Sichtpfeil VIII-VIII in Fig. 9,

Fig. 9

eine Rück-Ansicht des Schneidblocks gemäß dem Sichtpfeil IX in Fig. 8,

Fig. 10

einen vertikalen Längsschnitt durch den Schneidblock gemäß der Schnittlinie X-X in Fig. 9,

Fig. 11

eine Teil-Stirnansicht der Nähmaschine gemäß dem Sichtpfeil XI in Fig. 1 in einer Endlage der Messer,

Fig. 12

eine schematische Seitenansicht des Schneidblocks in einer Endlage,

Fig. 13

eine schematische Ansicht des Schneidblocks in der anderen Endlage,

Fig. 14

eine Teil-Stirnansicht der Nähmaschine gemäß dem Sichtpfeil XIV in Fig. 1 in der anderen Endlage der Messer,

Fig. 15

eine Knopflochnaht mit einem Knopfloch-Schnitt,

Fig. 16

eine Knopflochnaht mit einem Augenloch-Schnitt, und

Fig. 17

eine Schnürlochnaht mit einem Schnürloch.

An embodiment of the invention will be explained in more detail with reference to the drawing. It shows

Fig. 1

a longitudinal view of an eye buttonhole sewing machine with a buttonhole cutting device,

Fig. 2

2 is a horizontal partial section through the sewing machine according to the section line II-II in FIG. 1 in comparison with FIG. 1 enlarged scale,

Fig. 3

a perspective view of a knife unit,

Fig. 4

a view of the blade unit according to the sighting arrow IV in Fig. 5,

Fig. 5

3 a side view of the blade unit according to the sighting arrow V in FIG. 4,

Fig. 6

a vertical cross section through the blade unit according to the section line VI-VI in Fig. 5,

Fig. 7

a perspective view of a cutting block,

Fig. 8

a side view of the cutting block according to the sighting arrow VIII-VIII in Fig. 9,

Fig. 9

9 is a rear view of the cutting block according to the viewing arrow IX in FIG. 8;

Fig. 10

a vertical longitudinal section through the cutting block according to the section line XX in Fig. 9,

Fig. 11

3 is a partial end view of the sewing machine according to the viewing arrow XI in FIG. 1 in an end position of the knives, FIG.

Fig. 12

a schematic side view of the cutting block in an end position,

Fig. 13

a schematic view of the cutting block in the other end position,

Fig. 14

3 is a partial end view of the sewing machine according to the viewing arrow XIV in FIG. 1 in the other end position of the knives, FIG.

Fig. 15

a buttonhole seam with a buttonhole cut,

Fig. 16

a buttonhole seam with an eye-hole cut, and

Fig. 17

a Schnürlochnaht with a Schnürloch.

As can be seen in FIG. 1, a buttonhole sewing machine is C-shaped, ie it has an upper arm 1, a lower, base-like base plate 2 and a connecting, approximately vertical upright 3. In the arm 1, an arm shaft 4 is mounted in a conventional manner, which is driven by a drive motor, not shown. The arrangement of such a drive motor on such a sewing machine is off DE 102 25 511 C1 and DE 102 25 512 C1 known. From the arm shaft 4, the drive of a vertically displaceable needle bar 5 with a needle 6 and a vibratory drive are derived for this purpose in a conventional manner.

On the base plate 2, an xy-table 7 is arranged, which is thus a in two horizontal coordinate directions, namely the x-direction and the y-direction, slidable cross slide. The xy-table 7 is formed in a conventional manner, as for example from the DE 198 07 771 C1 (Corr. US 6,095,066 ) is known. The drive of the xy-table 7 by means not shown drives, namely an x-drive and a y-drive, which is usually manner to positionable electric motors, ie usually stepper motors, but also controllable DC motors, is. Such a configuration is from the DE 102 25 511 C1 and the DE 102 25 512 C1 known.

On the xy table 7, a two-part support plate 8a, 8b is arranged. Each partial support plate 8a or 8b is associated with a fabric clamp 9a or 9b, each having a mounted on the respective sub-support plate 8a and 8b partial support plate 10a and 10b, each of which a clamping plate 11a and 11b is assigned. The clamping plates 11a and 11b are attached to double-armed bearing levers 12a and 12b, respectively. Details of the structure and the drive of the Nähgutklammern 9a, 9b arise from the DE 102 16 808 C2 (corresponding US 6,722,299 B2 ), to which extent is referred.

In the y-direction behind the needle bar 5 is a button hole-cutting device 13, which has a lower, in the base plate 2 vertically, ie in the z-direction, fixedly arranged blade unit 14 and an upper cutting block 15. The cutting block 15 is associated with a cutting drive 16, which is designed as a multi-stage pneumatically acted piston-cylinder drive and in detail in DE 102 25 511 C1 and DE 102 25 512 C1 is shown and described. The cutting drive 16 passes through the stator 3. The one lower end of the cutting drive 16 is fixed in the base plate 2 by means of a hinge 17. The other upper end of the drive 16 is connected to a two-armed lever 18 by means of a hinge 19, which in turn is articulated by means of a sliding rotary joint 20 on a drive rod 21 which in at least one arranged in the arm 1 guide bearing 22nd is guided vertically displaceable. The two-armed lever 18 is pivotable approximately in its center about a mounted in the arm 1 horizontal pivot axis 23.

The lower knife unit 14 has a receiving plate 24 which is fixed by means of a spherical bearing surface 25 and fastening screws 26 on the bottom part 27 of the base plate 2. By this type of attachment, the recording plate 24 can be aligned, and in order an axis defined by the y-direction and a horizontal and transverse thereto, given by the x-direction axis.

As far as the sewing machine is shown and described so far, it is from the DE 103 04 821 B3 known.

On the receiving plate 24, a transverse carriage 28 is slidably mounted in the x direction between two end positions. This carriage 28 can be driven by means of a two-position linear drive 29, which is formed by a between the receiving plate 24 and the cross slide 28, pneumatically actuated piston-cylinder drive. The cylinder 30 of this drive 29 is mounted on the receiving plate 24. Its piston rod 31 protrudes sealed at both ends out of the cylinder 30 and is connected at its ends 32, 33 with the cross slide 28. The piston rod 31 carries in the cylinder 30 a relative to the cylinder 30 sealed piston 34, so that on both sides of the piston 34, two cylinder chambers 35, 36 are formed. In these chambers 35, 36 open compressed air lines 37, 38, which are acted upon via a formed as a solenoid valve control valve 39 by a compressed air supply line 40 depending on the control with compressed air. The control of the control valve 39 via the only indicated control 41 with control panel 42 of the sewing machine. Depending on the compressed air loading of the drive 29 is the piston rod 31 with piston 34 and accordingly the cross slide 28 in one of the end positions, which is predetermined by the stop of the piston 34 at the end of the cylinder 30.

At the top of the transverse carriage 28 are two extending in the y-direction, vertically, ie in the z-direction upstanding side support walls 43, 44 are formed, between which two blades 45, 46 with different trained cutting 47, 48 are arranged detachably and replaceably. They are clamped by means of jaws 49 and screws 50 on the cross slide 28 so that they between the side support walls 43, 44, the cross slide 28 and the jaws 49 in the x-, y- and z-direction fixed clamped and thus held firmly against the cross slide 28. As can be seen from the above description and the accompanying drawings, so the lower blade unit 14 together with its drive 29 is a closed unit or assembly that can be pre-assembled and used as a whole component outside the sewing machine.

On the underside of the drive rod 21, a support plate 51 is formed, on the underside of a drive housing 52 is mounted with a longitudinal slide 53, which is thus displaceable in the y-direction. In this drive housing 52 is a two-position linear drive 54, which is also designed as a pneumatically acted piston-cylinder drive. It has a cylinder 55 extending in the y-direction, in which a piston 56 is guided in a sealed manner, which in turn is attached to a piston rod 57 guided out of one end of the cylinder 55 in a sealed manner. The piston 56 divides the cylinder 55 into two cylinder chambers 58, 59, which are each acted upon via compressed air line 60, 61 with compressed air. The admission takes place via a control valve 62, to which the compressed air is supplied via a compressed air supply line 63. The control of the control valve 62 is also carried out by the controller 41 with control panel 42.

With the projecting out of the cylinder 55 end of the piston rod 57 of the longitudinal carriage 53 is connected to which in turn designed as an anvil 64 counter knife is mounted detachable and replaceable. This Anvil 64 is slidably guided in a direction extending in the y direction guide 65 on the underside of the drive housing 52. In the x and z direction, this anvil 64 is mounted without play. Depending on the compressed air applied to one or the other cylinder chamber 58 or 59 with compressed air, the piston 56 is in one of the end positions of the cylinder 55. Accordingly, the anvil 64 is in one of its two end positions.

As is apparent from the above, the cutting block 15 is a self-contained unit mounted on the drive rod 21, in which the two-position linear drive 54 is also integrated. Except for the drive rod 21, the cutting block 15 is connected to the sewing machine only via the flexible compressed air lines 60, 61.

The two blades 45, 46 of the lower blade unit 14 have different shapes. In the exemplary embodiment shown, the cutting edge 47 of the knife 45 has a straight cutting part 66 and at one end thereof an eye cutting part 67. The cutting edge 48 of the knife 46 has in the illustrated embodiment, only one eye-cutting part, which - with respect to the x-direction - is located next to the eye-cutting portion 67 of the knife 45. The anvil 64 has on its underside, so the blades 45, 46 facing a flat, extending in the xy plane, mating surface 69, whose width a (Figure 9) at least on the eye-blade portions 67, 68 facing the end at least the width b of these eye-cutting portions 67, 68 (Fig. 6) corresponds in the x-direction.

The length c of the mating surface 69 in the y direction (FIG. 12) corresponds substantially to the length of the smallest eye buttonhole to be cut.

The length d of the rectilinear cutting part 66 in the x direction (FIG. 5) is generally greater than the length c of the mating surface 69. Furthermore, the displacement path e of the anvil 64 in the y direction (FIG. 13) is at least as great as the extension f of the eye-cutting part 67 in the y-direction (FIG. 5), so that the counter-surface 69 can be brought out of engagement with this eye-cutting part 67. Instead of the single eye cutting part 68, it is also possible, for example, to use a circular eyelet cutting part, not shown, by means of which a so-called eyelet hole can be cut.

The above-described adjustability of the lower blade unit 14 serves to bring the blade portions 66, 67, 68 in an exact abutment against the counter surface 69 of the anvil 64, so that upon actuation of the buttonhole cutting device 13 produces a clean cut becomes.

The working method is as follows:

By means of the fabric clamp 9a, 9b a fabric part 70 is held on the support plate 10a, 10b, with its later visible side down. An eye-buttonhole seam 71 is sewn, which has two straight caterpillar-shaped seam sections 72, 73 and a caterpillar-shaped eye section 74 which also connects them. After sewing the buttonhole seams 71, 72, 73, the x-y table 7 is moved in the y-direction in such a way that the workpiece 70 passes into the correct position between the knife unit 14 and the cutting block 15.

For cutting the eye hole 75 and the rectilinear so-called laundry hole 76 shown in FIG. 15, the cross slide 28 of the lower knife unit 14 is moved so that the knife 45 is shown in FIG. 11 located below the anvil 64. The longitudinal carriage 53 with the anvil 64 is moved into the end position according to FIG. 12, in which the mating surface 69 is located above the eye-cutting part 67 and above the straight-line cutting part 66. By operating the cutting drive 16, the upper cutting block 15 is moved downwards with the anvil 64, so that the eye hole 75 and the rectilinear clothes hole 76 are cut by co-operation of the lower knife 45 with the anvil 64. If the laundry hole cut to be produced is longer than it could be produced at the first cut, then the anvil 64 is moved by appropriate actuation of the drive 54 in the position shown in FIG. 13, in which the mating surface 69 of the anvil 64 only above rectilinear cutting part 66 of the knife 45 is located. By appropriately moving the xy-table 7 in the y-direction, the fabric part 70 is moved in such a way that a straight cut is made in the next cut, by which the clothesline cut 76 is lengthened accordingly. This can theoretically be repeated.

If, according to FIG. 16, only one eye hole 75 is to be cut, then, as shown in FIG. 14, the transverse carriage 28 is moved into its other end position so that the eye cutting part 68 is below the counter surface 69 of the anvil 64. After sewing the seams 71 to 73, the fabric part 70 is moved in the manner already described between the knife unit 14 and the cutting block 1 5 and then the buttonhole cutting device 13 is actuated, so that only one eye hole cut 75 is performed here.

If, according to FIG. 17, a lacing hole 77 is to be produced, then a corresponding caterpillar-shaped lacing seam 78 is sewn. The Schnürloches is cut with a corresponding circular knife then in the same manner as the cutting of the eye hole of FIG. 16.

Claims (11)

1. A button-hole sewing machine comprising

   - a base plate (2), an upper arm (1) and a stand (3) which connects the arm (1) with the base plate (2),

   - a needle (6) which is movable up- and downwards,

   - at least one work piece clamp (9a, 9b) which is displaceable in a y-direction,

   - a button-hole cutting device (13) which

   -- is arranged downstream of the work piece clamp (9a, 9b) in y-direction as seen from the needle (6),

   -- is provided with a knife unit (14) which is arranged in the base plate (2) and has a knife (45) with at least one cutting edge (66, 67),

   -- is provided with an upper cutting block (15) which cooperates with the knife (45) and has an anvil (64) providing a counter surface (69) for the knife (45),

   -- is provided with a cutting drive (16) for a displacement of the cutting block (15) in a vertical z-direction downward towards the knife (45), and

   -- is provided with a drive (54) for a displacement of the anvil (64) in a y-direction with reference to the knife (45),

   characterized
   in that the knife unit (14) is provided with two side-by-side knives (45, 46), and
   in that a drive (29) is provided for a displacement of the knives (45, 46) in an x-direction which is transverse to the y-direction and transverse to the z-direction, with said displacement taking place between two end positions where only one knife (45, 46) at a time is applicable to the counter surface (69) of the anvil (64).
2. A button-hole sewing machine according to claim 1 characterized
   in that a knife (45) is provided with a straight cutting edge (66) extending in the y-direction and an eye-cutting edge (67).
3. A button-hole sewing machine according to claim 1 characterized
   in that a knife (46) is provided with an eye-cutting edge (68) or an eyelet-cutting edge only.
4. A button-hole sewing machine according to claim 1 characterized
   in that the drive (54) for the displacement of the anvil (64) is integrated in the cutting block (15).
5. A button-hole sewing machine according to claim 1 characterized
   in that the drive (29) for the displacement of the knife (45, 46) is integrated in the knife unit (14).
6. A button-hole sewing machine according to claim 1 characterized
   in that the drive for the displacement of the anvil (64) is configured as a pneumatically-actuated two-position linear drive (54).
7. A button-hole sewing machine according to claim 1 characterized
   in that the drive for the displacement of the knives (45, 46) is configured as a pneumatically-actuated two-position linear drive (29).
8. A button-hole sewing machine according to the claims 1, 4 and 6 characterized
   in that the anvil (64) is connected with a piston rod (57) of the drive (54) by means of a longitudinal slide (53).
9. A button-hole sewing machine according to the claims 1, 5 and 7 characterized
   in that the knives (45, 46) are connected with a piston rod (31) of the drive (29) by means of a transverse slide (28).
10. A button-hole sewing machine according claim 1 characterized
    in that the knives (45, 46) are arranged detachably and replaceably on the knife unit (14).
11. A button-hole sewing machine according to claim 1 characterized
    in that the anvil (64) is arranged detachably and replaceably on the cutting block (15).

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