EP1559823B1 - 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 according to the preamble of claim 1.

In such from the EP 1 354 993 A2 Known eye buttonhole sewing machine, the fabric clamp is designed such that a lower clamping plate is slidably connected to the xy table in the x direction, while connected to the lower clamping plate upper clamping plate by means of a pneumatically actuated piston-cylinder drive against the lower clamping plate can be pressed for clamping a workpiece. The pneumatically actuated piston-cylinder drive can be pressurized with compressed air via a flexible compressed air hose.

From the DE 28 07 895 C2 is a sewing machine with a fabric clamp known, the clamping drive has its own accumulator, which is separated during sewing by a compressed air hose for compressed air supply. To charge the compressed air storage this is connected by means of a hose coupling with the compressed air hose.

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

The invention has the object of developing the eye buttonhole sewing machine of 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. Characterized in that a releasable coupling is arranged between the pneumatically actuable piston-cylinder drive and the compressed air hose, the removal of the fabric clamp with the gripper bearing overlapping lower clamping plate is possible in a very simple manner. Likewise, the connection is possible in a very simple manner. The manufacture and release of the coupling connection is carried out by the intended movement of the fabric clamp when removing or placing. The coupling parts engage in the operating state, d. H. they do not have to be held against each other with corresponding force, as in the case of flat coupling parts.

The development according to claim 2 ensures that the relative movements in the x and y direction between the x-y table and the fabric clip are not affected.

Through the development according to claim 3 ensures that the fabric clip has no downwardly projecting hose end or the like. In this respect, the coupling part is largely protected even if improperly removed or inserted Nähgut-clip.

Through the development according to claim 4 it is achieved that the manufacture of the coupling state is achieved by self-centering of the coupling parts to be pushed into one another.

A particularly simple embodiment offers this claim 5, since this is the same displaceability in the x and y direction in the clutch itself realized.

An alternative embodiment is specified in claims 6 to 8.

Through the development according to claims 7 and 8, a further simplification of handling and thus a time savings in releasing and producing the clutch is achieved.

The development according to claim 9 ensures that the fabric clamp with the lower clamping plate in the operating position of the fabric clip can not be lifted from the x-y table.

Two embodiments of the invention will be explained in more detail with reference to the drawings.

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, an eye-buttonhole sewing machine is C-shaped, ie it has an upper arm 1, a lower, base-like base plate 2 and an approximately vertical upright 3 connecting them. In the arm 1, an arm shaft 4 is mounted in a conventional manner, which is driven by a drive motor, not shown. From the arm shaft 4, the drive of a vertically displaceable in the z-direction needle bar 5 with a needle 6 and a vibratory drive for this purpose are derived in the usual way. Below the needle bar 5 with needle 6, a gripper bearing 7 is arranged in the base plate 2, which is rotatably driven about a vertical axis 8. The drive of the gripper bearing 7 is derived in a conventional manner from the arm shaft 4.

On the base plate 2, an xy-table 9 is arranged, which is thus a in two horizontal coordinate directions, namely the x-direction and the y-direction, displaceable cross slide. The xy-table 9 is formed in a conventional manner, as for example from the DE 198 07 771 A1 (corresponding U.S. Patent 6,095,066 ) is known. The drive of the xy-table 9 takes place by means of an x-drive and a y-drive, which are positionable electric motors, ie preferably stepping motors, but also controllable DC motors. These drives are not shown.

On the xy table 9, a two-piece lower clamping plate is arranged, of which only the - seen in Fig. 1 and 2 in the y direction - right lower clamping plate 10 is shown, which is supported on the xy-table 9 displaceable in the x direction is. This embodiment is from the EP 1 354 993 A2 (corresponding 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 must be removed for drawing a looper thread. The fabric clamp located to the left of the needle 6 in FIG. 2 is not shown, but is arranged mirror-symmetrically to the sewing material clamp 11 with respect to the needle 6. Only the sewing material clamp 11 to the right of the needle 6 will be described.

Each fabric clamp 11 has in each case a double-armed bearing lever 12, which is formed from a pivot lever 13 and a shift lever 14. The sliding lever 14 carries at its free end an upper clamping plate 15. The pivot lever 13 is pivotally mounted about a pivot axis 16 in the drive and bearing housing 17. This is fastened by means of screws 18 on 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 pivot lever 13 and the shift lever 14 are connected by means of a sliding-locking connection 19 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 bottom open and closed at the top by the lower clamp plate 10 cylinder space 21, in which a piston 22 sealed up and arranged to move is. This piston 22 has a downwardly protruding from the cylinder chamber 21 piston rod 23 which is articulated by means of a hinge 24 at the facing end 25 of the pivot lever 13, so the bearing lever 12. In addition to the cylinder space 21, a compressed air connection channel 26 is formed in the housing 17, which is connected at the top of the housing 17 by means of an overflow channel 27 with the cylinder chamber 21. At the bottom of the housing 17 opens into the compressed air connection channel 26, a compressed air hose 28, which is connected to an electromechanically actuated 3/2-way valve 29, a so-called solenoid valve. As can be seen from the description, the clamping drive 20 is therefore a one-sided pneumatically actuated piston-cylinder unit.

In the region of the end 25 of the pivot lever 13, a prestressed tension spring 30 is fixed, the other end is fixed to the top of the housing 17, so that the bearing lever 12 is lifted with the upper clamping plate 15 of the lower clamping plate 10 when the piston 22 is not Compressed air is applied from above. In contrast, when the piston 22 is acted upon from above with compressed air, 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 15 and the lower clamping plate 10, a workpiece 31 is clamped.

The compressed air hose 28 is connected to the housing 17 by means of a detachable hose coupling 32. For this purpose, a support plate 33 is secured by means of screws 34 on the underside of the x-y table 9, which extends parallel to the lower clamping plate 10 to below the housing 17. At this relative to the x-y table 9 stationary support plate 33 of the compressed air hose 28 is fixed by means of an angle hose connection 35. In the embodiment according to FIGS. 1 to 4, the actual hose coupling 32 is formed by a funnel section 36 adjoining the compressed air connection channel 26 and a connecting tube 37 projecting through the latter into the channel 26. The funnel section 36 widens down toward the support plate 33. In the engaged state, the elastically flexible connection hose 37 extends through the funnel section 36 in the z direction into the compressed air connection channel 26, where it is sealed against the housing 17 by means of a ring seal 38 which surrounds it that in the engaged state shown in Fig. 4, a compressed air-tight connection between the compressed air hose 28 and the compressed air connection channel 26 is made. The funnel portion 36 is thus a receptacle of a coupling part, while the connecting tube 37 is a projecting part of another coupling part which is inserted in the z-direction in the receptacle. Due to the funnel-shaped configuration of the section 36, the insertion and centering of the connection tube 37 is greatly facilitated.

If the lower clamping plate 10 is removed with the fabric clamp 11 up from the xy table 9, then the remains with the xy 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 work clamp 11 with the lower clamping plate 10 and the clamping drive 20 including the funnel portion 36 with the ring seal 38 is pulled up from the connection tube 37. Against unintentional lifting of the fabric clamp 11 with the lower clamping plate 10 from the xy table 9, the latter is secured by a retaining web 39 which is secured to the lower part of the pivot lever 13. The retaining web 39 may be formed, for example, by the head of a retaining screw. This holding web 39 engages - as shown in FIGS. 3 and 4 reveals - in the operating position shown in the drawing, the support plate 33 in the region of their dashed lines in Fig. 3 shown edge 33 a. When the cylinder chamber 21 is vented, the bearing lever 12 is in the raised position by the force of the prestressed tension spring 30, so that the retaining web 39 no longer engages under the support plate 33. Therefore, the lower clamping plate 10, ie the cloth clamp 11, slightly shifted in the y-direction relative to the xy-table and then in the z-direction, that is lifted upwards.

As mentioned above, the lower clamping plate 10 is displaceable relative to the xy table 9 in the x direction by a small amount, which results from the configuration of the sewing machine as an eye-buttonhole sewing machine. This slight displacement in the x direction takes place by means of a displacement drive 40, of which only one drive lever 41 is shown, which acts on the lower clamping plate 10. The above-mentioned movements of the lower clamping plate 10 in the xy 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 the 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, a slide 42 designed as a plate is slidably mounted on the support plate 33' about the aforementioned displaceability of the clamping plate 10 in the x-y plane. For this purpose, the carriage 42 downwardly projecting pins 43 which pass through holes 44 in the support plate 33 ', said holes 44 have a significantly larger diameter than the pins 43, so that a corresponding game 45 in x and y Direction is given. The carriage 42 is secured to the pins 43 below the support plate 33 'attached retaining rings 46 against lifting.

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

Claims (9)

1. An eye-type buttonhole sewing machine, comprising

   - a base plate (2);

   - a needle (6) which is drivable in a z direction by means of an arm shaft (4);

   - a hook bearing (7) which is disposed underneath the needle (6) in the base plate (2);

   - an x-y table (9) which is mounted on the base plate (2) and displaceable in an x direction and in a y direction;

   - at least one work-piece clamp (11) which is mounted on the x-y table (9) for displacement in the x direction and which is displaceable by means of a sliding drive (40);

   -- the work-piece clamp (11) having a bottom clamping plate (10) which is detachable from the x-y table (9) upwards in the z direction and attachable on the x-y table (9) from above in the z direction, and

   -- the work-piece clamp (11) having a top clamping plate (15) which is articulated to the bottom clamping plate (10);

   - a clamping drive (20) which is mounted on the bottom clamping plate (10) and constituted by a pneumatically operable piston-cylinder drive for actuation of the top clamping plate (15); and

   - a compressed-air hose (28) which is connected to the clamping drive (20) for supply of the clamping drive (20) with compressed air;

   characterized
   in that the compressed-air hose (28) is releasably connected to the clamping drive (20) by means of a hose coupling (32, 32');
   in that the hose coupling (32, 32') comprises a coupling member which is connected to the clamping drive (20) and a coupling member which is connected to the compressed-air hose (28); and
   in that a coupling member comprises a receptacle and the other coupling member comprises a projecting part which is insertable in the z direction into the receptacle for production of a coupling union and which is removable in the z direction from the receptacle for release of the coupling union.
2. An eye-type buttonhole sewing machine according to claim 1, characterized
   in that the hose coupling (32, 32') has motional play in the x-y direction.
3. An eye-type buttonhole sewing machine according to claim 1 or 2, characterized
   in that the coupling member which is provided with the receptacle is formed on the clamping drive (20).
4. An eye-type buttonhole sewing machine according to one of claims 1 to 3, characterized
   in that the coupling member which is provided with the receptacle comprises a hopper portion (36) that expands outwards.
5. An eye-type buttonhole sewing machine according to one of claims 1 to 4, characterized
   in that the projecting part is a flexible connecting hose (37).
6. An eye-type buttonhole sewing machine according to one of claims 2 to 5, characterized
   in that the projecting coupling member is a connecting pipe (49).
7. An eye-type buttonhole sewing machine according to claim 6, characterized
   in that the connecting pipe (49) is rigid.
8. An eye-type buttonhole sewing machine according to claim 6 or 7, characterized
   in that the coupling member that comprises the projecting part is connected to the x-y table (9) for displacement in the x-y direction.
9. An eye-type buttonhole sewing machine according to one of claims 1 to 8, characterized
   in that the work-piece clamp (11), in a position of operation, is secured in the z direction by means of a safeguard device.

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