EP1559823A2 - Eyelet buttonholing sewing machine - Google Patents

Abstract

A buttonhole sewing machine has an x/y sewing surface (9) with a variable-position X-plane fabric work piece clamp (11) shifted by a pneumatic piston and cylinder unit linked by a push-fit detachable connector (32) to a compressed air line (28). The compressed air line connector has freedom of movement in the x and y planes. The connector (32) has a conical cross section (36) and is co-located with the clamp drive (20).

Description

The invention relates to an eye-buttonhole sewing machine after Preamble of claim 1.

In such eye buttonhole sewing machine known from EP 1 354 993 A2 is the sewing material clamp designed in such a way that a lower clamping plate with the x-y table in the x direction displaced is connected while connected to the lower clamping plate upper clamping plate by means of a pneumatically actuated piston-cylinder drive against the lower clamping plate for clamping a Sewing material is pressed. The pneumatically actuated piston-cylinder drive is via a flexible compressed air hose with compressed air acted upon.

From DE 28 07 895 C2 is a sewing machine with a fabric clamp known, the clamping drive own pressure fluid accumulator during the sewing of a compressed air hose to Compressed air supply is disconnected. To charge the compressed air storage this is done by means of a hose coupling with the compressed air hose connected.

Eye buttonhole sewing machines are usually with one below provided the lower clamping plate arranged gripper bearing, which is a so-called Gripper thread is fed. It is therefore necessary for the Threading process of this rapier thread, but also for cleaning and maintenance work, remove the fabric clamp from its operating position. It has proved to be annoying that the compressed air hose firmly connected to the piston-cylinder drive.

The invention is based on the object, the eye buttonhole sewing machine the generic type such that the Gripper-bearing is easily accessible.

This object is achieved by the features in the characterizing part of claim 1 solved. In that between the pneumatic acted upon piston-cylinder drive and the compressed air hose a releasable coupling is arranged, is the removal of the Sewing material clamp with the lower clamping plate covering the gripper bearing in a very simple way possible. Likewise, the manufacturing is the connection in a very simple manner possible. The manufacture and release The coupling connection is made by the intended movement the fabric clamp when removing or putting on. The coupling parts engage in the operating state, d. H. they do not have to like it for flat fitting coupling parts - with appropriate Force to be held against each other.

The development according to claim 2 ensures that the relative movements in the x and y direction between the x-y table and the Sewing material clip should not be affected.

Through the development according to claim 3 ensures that the fabric clamp no downwardly projecting hose end or the like having. Insofar is even with improperly removed or used Sewing material clamp the coupling part largely protected.

Through the development according to claim 4 ensures that the production the coupling state by self-centering of each other too sliding coupling parts is achieved.

A particularly simple embodiment offers this claim 5, since this at the same time the necessary displacement in x and y direction in the coupling itself is realized.

An alternative embodiment is specified in claims 6 to 8.

Through the development according to claims 7 and 8 is another Simplification of handling and thus a time saving in solving and establishing the clutch achieved.

Through the development according to claim 9 ensures that the Sewing material clamp with the lower clamping plate in the operating position of the Sewing material clip can not be lifted off the x-y table.

Two embodiments of the invention are described below with reference to the Drawings explained in more detail.

Fig. 1

eine Seitenansicht einer Augen-Knopfloch-Nähmaschine in teilweise aufgebrochener Darstellung,

Fig. 2

eine Schnitt-Ansicht der Nähmaschine entsprechend der Schnittlinie II-II in Fig. 1 in gegenüber Fig. 1 vergrößertem Maßstab,

Fig. 3

eine Darstellung eines Klemm-Antriebs entsprechend dem Sichtpfeil III in Fig. 1 in gegenüber Fig. 1 vergrößerter Darstellung,

Fig. 4

eine Schnittdarstellung durch eine untere Klemmplatte mit dem daran angeordneten Klemm-Antrieb entsprechend der Schnittlinie IV-IV in Fig. 3,

Fig. 5

eine perspektivische Darstellung des Antriebs-Lager-Gehäuses des Klemm-Antriebs,

Fig. 6

ein zweites Ausführungsbeispiel eines an einem x-y-Tisch angeordneten Kupplungs-Teils in einer Darstellung entsprechend Fig. 4 in vergrößertem Maßstab und

Fig. 7

eine Ansicht auf das Kupplungs-Teil entsprechend dem Sichtpfeil VII in Fig. 6.

Further features, advantages and details of the invention will become apparent from the following description with reference to the drawing. It shows

Fig. 1

a side view of an eye-buttonhole sewing machine in a partially broken view,

Fig. 2

3 is a sectional view of the sewing machine according to the section line II-II in Fig. 1 in comparison with FIG. 1 enlarged scale,

Fig. 3

1 is a representation of a clamping drive corresponding to the viewing arrow III in FIG. 1 in an enlarged representation relative to FIG. 1,

Fig. 4

a sectional view through a lower clamping plate with the clamping drive arranged thereon according to the section line IV-IV in Fig. 3,

Fig. 5

a perspective view of the drive-bearing housing of the clamping drive,

Fig. 6

a second embodiment of an arranged on an xy table coupling part in a view corresponding to FIG. 4 on an enlarged scale and

Fig. 7

a view of the coupling part according to the viewing arrow VII in Fig. 6.

As can be seen in Fig. 1, there is an eye buttonhole sewing machine C-shaped, d. H. it has an upper arm 1, a lower, box-like trained base plate 2 and one connecting both, about vertical stand 3 on. In Arm 1 is in the usual way an arm shaft. 4 mounted, which is driven by a drive motor, not shown. From the arm shaft 4 in the usual way, the drive of a vertically in z-direction sliding needle bar 5 with a needle 6 and a Oscillation drive derived for this purpose. Below the needle bar 5 with needle 6, a gripper bearing 7 is arranged in the base plate 2, which is a vertical Axis 8 is rotary drivable. The drive of the gripper bearing 7 is in the usual Way derived from the arm shaft 4.

On the base plate 2, an x-y table 9 is arranged, in which it is so around one in two horizontal coordinate directions, namely the x-direction and the y-direction, slidable cross slide. The x-y table 9 is formed in a conventional manner, as 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 stage 9 takes place by means of an x-drive and a y-drive, which are positionable electric motors, as a rule So preferably stepper motors, but also controllable DC motors is. These drives are not shown.

On the x-y table 9, a two-piece lower clamping plate is arranged, of which only the - seen in Fig. 1 and 2 in the y direction - lower right Clamping plate 10 is shown, which is displaceable on the x-y table 9 in the x direction is supported. This embodiment is known from EP 1 354 993 A2 (corresponding to US Ser No. 10/410 467), to which reference is made. Each lower clamping plate 10 is part of a fabric clamp 11. The lower Clamping plate 10 covers the gripper bearing 7 and has to retract a Gripper thread are removed. The left in Fig. 2 of the needle 6 located material clip is not shown, but is mirror-symmetrical arranged to the fabric clamp 11 against the needle 6. It only the sewing material clamp 11 to the right of the needle 6 will be described.

Each fabric clamp 11 each has a double-armed bearing lever 12, which consists of a pivot lever 13 and a shift lever 14th is formed. The shift lever 14 carries at its free end an upper Clamping plate 15. The pivot lever 13 is about a pivot axis sixteenth pivotally mounted in the drive and bearing housing 17. This is by means of Screws 18 attached to the underside of the lower clamping plate 10. Both Parts are at their contact surface by means of a liquid, not shown Sealant compressed air tightly connected. The swivel lever 13 and the shift lever 14 are by means of a sliding-locking connection 19 connected in the y-direction adjustable in length with each other.

The housing 17 is part of a clamping drive 20 for the fabric clamp 11. In the housing 17 is a continuous lower open and above formed by the lower clamping plate 10 closed cylinder space 21, in which a piston 22 sealingly arranged up and down movable is. This piston 22 has a downward from the cylinder space 21st outstanding piston rod 23, which by means of a joint 24 facing on End 25 of the pivot lever 13, so the bearing lever 12, articulated is. In addition to the cylinder space 21 is a compressed air connection channel 26 formed in the housing 17, which at the top of the housing 17 by means of an overflow channel 27 is connected to the cylinder space 21. At the bottom of the housing 17 opens into the compressed air connection channel 26 a compressed air hose 28, which is an electromechanical operable 3/2-way valve 29, a so-called solenoid valve, connected is. As the description reveals, it is with the Clamping drive 20 so to one-sided pneumatically acted upon Piston-cylinder unit.

In the region of the end 25 of the pivot lever 13 is a prestressed tension spring 30 fixed, the other end to the top of the housing 17th is set so that the bearing lever 12 with the upper clamping plate 15th is lifted from the lower clamping plate 10 when the piston 22 is not Compressed air is applied from above. In contrast, when the piston 22nd Compressed air is applied from above, the shift lever 14 of the Bearing lever 11 with the upper clamping plate 15 against the lower clamping plate 10, wherein in operation between the upper clamping plate 15th and the lower clamping plate 10 a workpiece 31 is clamped.

The compressed air hose 28 is by means of a detachable hose coupling 32 connected to the housing 17. This is at the bottom of the x-y table 9 a support plate 33 secured by screws 34, which are parallel to the lower clamping plate 10 extends under the housing 17. At this relative to the x-y table 9 stationary support plate 33 is the compressed air hose 28 fixed by means of an angle hose connection 35. The actual hose coupling 32 is in the embodiment of FIGS. 1 to 4 by a subsequent to the compressed air connection channel 26th Funnel section 36 and through it into the channel 26 protruding connecting hose 37 formed. The funnel section 36 expands down to the support plate 33 out. In engaged state the elastically flexible connection hose 37 extends through the funnel portion 36 in the z-direction in the compressed air connection channel 26, where he uses a ring seal around him 38 is sealed relative to the housing 17, so that in the in Fig. 4th illustrated coupled state a compressed air-tight connection between the compressed air hose 28 and the compressed air connection channel 26 is made. The funnel section 36 is thus a receptacle of a Coupling part, while the connection hose 37 is a protruding part a further coupling part is inserted in the z direction in the receptacle becomes. Due to the funnel-shaped configuration of the section 36 the insertion and centering of the connection tube 37 is greatly facilitated.

When the lower clamping plate 10 with the fabric clamp 11 upwards is removed from the x-y table 9, then remains with the x-y table. 9 connected via the support plate 33 compressed air hose 28 with the angle hose connection 35 and the connection hose 37 to the base plate 2 of the sewing machine, while the sewing material clamp 11 with the lower Clamping plate 10 and the clamping drive 20 including the funnel section 36 with the ring seal 38 upwards from the connection hose 37 is deducted. Against unintentional lifting of the Sewing material clamp 11 with the lower clamping plate 10 from the x-y table 9 is the latter secured by a retaining web 39, which at the lower part of Swing lever 13 is attached. The holding web 39 can, for example be formed by the head of a retaining screw. This holding web 39 engages - as can be seen Figs. 3 and 4 - in the in the drawing shown operating position, the support plate 33 in the region of their in Fig. 3rd dashed edge 33a. When the cylinder space 21 vented is, the bearing lever 12 is located by the force of the biased tension spring 30 in the swung-up position, so that the holding web 39 the Support plate 33 no longer engages under. Therefore, the lower clamping plate 10, d. H. the fabric clamp 11, slightly in the y direction opposite to the moved x-y table and then in z-direction, so up, lifted become.

As mentioned above, the lower clamping plate 10 is relative to the x-y table 9 in the x-direction by a small amount displaced, resulting from the Design of the sewing machine as eye-buttonhole sewing machine results. This slight shift in the x direction is done by means of a Displacement drive 40, of which only one drive lever 41 is shown, which engages the lower clamping plate 10. The previously mentioned Movements of the lower clamping plate 10 in the x-y plane are possible because the connecting tube 37 is in the funnel section 36 in the x-direction and the y-direction corresponding to the lower opening width of Funnel section 36 can deform laterally. These movements of a few millimeters in the x and y directions are possible.

In the alternative embodiment of a hose coupling 32 'according to Figs. 6 and 7 is formed on the support plate 33 'as a plate Slide 42 to the aforementioned displaceability of the clamping plate 10th slidably mounted in the x-y plane. For this purpose, the carriage 42 downwardly projecting pins 43 which through holes 44 in the Support plate 33 'reach through, these holes 44 a clear larger diameter than the pins 43 have, so that a corresponding Game 45 is given in the x and y direction. The carriage 42 is through the pin 43 below the support plate 33 'attached retaining rings 46 secured against lifting.

The angle hose connection 35 'of the compressed air hose 28 passes through a bore 47 in the support plate 33 ', between the and the angle hose connection 35 a game 45 corresponding game 48 consists. The angle hose connection 35 'is attached to the carriage 42 and here firmly connected with an upwardly projecting connection pipe 49, which is rigid and inserted into the funnel section 36 of the housing 17 becomes. In the displacements of the lower clamping plate 10 in the x and y directions the connection pipe 49 moves in the x-y plane with the housing 17 and the carriage 42 relative to the support plate 33 ', which firmly with the x-y table 9 is connected. Its movements are elastic Compressed air hose 28 recorded and compensated.

Claims (9)

Eye buttonhole sewing machine, with a base plate (2), with a needle (6) which can be driven in a z-direction by means of an arm shaft (4), with a gripper bearing (7) arranged below the needle (6) in the base plate (2), with an xy-table (9) arranged on the base plate (2) and displaceable in an x-direction and a y-direction, with at least one on the xy-table (9) displaceably mounted in the x-direction, by means of a displacement drive (40) displaceable fabric clamp (11), the a in the z-direction from the top of the xy table (9) removable and from above on the xy table (9) in the z-direction can be placed lower clamping plate (10) and an upper clamping plate (15) hinged to the lower clamping plate (10), with a on the lower clamping plate (10) mounted, formed by a pneumatically actuated piston-cylinder drive clamping drive (20) for actuating the upper clamping plate (15), and with a with the clamping drive (20) connected compressed air hose (28) for supplying compressed air to the clamping drive (20), characterized in that the compressed air hose (28) by means of a hose coupling (32, 32 ') with the clamping drive (20) is detachably connected,
in that the hose coupling (32, 32 ') has a coupling part connected to the clamping drive (20) and a coupling part connected to the compressed air hose (28) and
is that a coupling part is a receptacle and the other coupling part has a protruding portion for making the coupling connection in the z direction into the receptacle can be inserted and for releasing the coupling compound in the z direction from the receptacle can be pulled out. Eye-buttonhole sewing machine according to claim 1, characterized in that the hose coupling (32, 32 ') has a movement-play in the xy-direction. Eye-buttonhole sewing machine according to claim 1 or 2, characterized in that the coupling part provided with the receptacle on the clamping drive (20) is formed. Eye-buttonhole sewing machine according to one of claims 1 to 3, characterized in that the coupling part provided with the receptacle has an outwardly widening hopper section (36). Eye-buttonhole sewing machine according to one of claims 1 to 4, characterized in that the projecting part is formed as an elastic connection hose (37). Eye-buttonhole sewing machine according to one of claims 1 to 4, characterized in that the projecting coupling part is designed as a connection pipe (49). Eye-buttonhole sewing machine according to claim 6, characterized in that the connecting tube (49) is rigid. Eye-buttonhole sewing machine according to claim 6 or 7, characterized in that the coupling part with the projecting part in the xy direction is slidably connected to the xy-table (9). Eye-buttonhole sewing machine according to one of claims 1 to 8, characterized in that the sewing material clamp (11) is secured in its operating position by means of a securing device in the z-direction.

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