KR20050077748A - Eye-type buttonhole 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

Buttonhole sewing machine {EYE-TYPE BUTTONHOLE SEWING MACHINE}

The present invention relates to an eye-type buttonhole sewing machine, wherein the sewing machine includes a base plate, a needle that can be driven in the z direction by an arm axis, a hook bearing disposed below the needle in the base plate, and An xy table disposed on the base plate and displaceable in the x and y directions, at least one work piece clamp mounted to the xy table for displacement in the x direction and displaceable by a sliding drive, and mounted to the bottom clamping plate; A clamping drive comprising a pneumatic piston-cylinder drive for operation of the upper clamping plate, and a compressed air hose connected to the clamping drive to supply compressed air to the clamping drive; The work piece clamping comprises a bottom clamping plate detachable in the z direction upward from the x-y table and attachable to the x-y table in the z direction from the top; The work member clamping may include an upper clamping plate segmented into a bottom clamping plate.

In the eye-shaped buttonhole sewing machine of the general type disclosed in EP 1 354 993 A2, the work piece clamp is buried in such a manner that the bottom clamping plate is connected to the xy table so as to be displaced in the x direction, whereas on the bottom clamping plate The connected upper clamping plate can be pressed against the bottom clamping plate by a pneumatic piston-cylinder drive that clamps the work piece. The pneumatic piston-cylinder drive may be operated by compressed air by a flexible compressed air hose.

DE 28 07 895 C2 discloses a sewing machine with a working clamp, the clamping drive having its own compressed fluid storage means during sewing, separated from the compressed air hose for supplying compressed air. In filling, the compressed air storage means is connected to the compressed air hose by a hose coupling.

As a result, the child buttonhole sewing machine includes a hook bearing disposed under the bottom clamping plate, and so-called looper threading is supplied. As with the laundry and maintenance work, threading of such looper threads requires that the work piece clamp be removed from the work position. If so, the problem is caused by a compressed air hose which is tightly coupled to the piston-cylinder drive.

It is an object of the present invention to improve an eye-shaped buttonhole sewing machine of the general type in such a way that the hook bearings are easily accessible.

According to the invention, this object is achieved that the compressed air hose is releasably connected to the clamping drive by a hose coupling; The hose coupling comprises a coupling member connected to the clamping drive and a coupling member connected to the compressed air hose; The coupling member includes a receptacle; Another coupling member may be inserted into the receptacle in the z direction to form a coupling coupling and includes a protrusion that can be released in the z direction from the receptacle to release the coupling coupling. It is achieved by a buttonhole sewing machine. The fact that a releasable coupling is provided between the pneumatic piston-cylinder drive and the compressed air hose makes it easier to control the work piece clamp with the bottom clamping plate covering the hook bearing. Similarly, the connection can also be produced easily. The production and release of the coupling is made by the action of the workpiece clamp upon removal and placement, if necessary. The coupling members are mutually coupled in operation, i.e. they do not have to be held against each other by corresponding forces in the case of monotonous adjustment of the coupling members.

As the hose coupling is movable in the x-y direction, it is ensured that the movement of the x-y table in the x and y directions and the workpiece clamps relative to each other are not affected.

As the coupling member having the receptacle is formed on the clamping drive, it is ensured that the work member clamp does not include a downwardly protruding hose end or the like. In this regard, the coupling member is significantly protected even when the workpiece clamp is not properly removed or inserted.

As the coupling member having the receptacle has a hopper portion extending outward, it is ensured that the coupling state is formed by self-centering of the coupling member slipped on each.

A very simple embodiment is provided by the protrusions, which are flexible connecting hoses, whereby the necessary variability in the x and y directions is carried out simultaneously in the coupling itself.

In yet another embodiment, the projecting coupling member is a connecting pipe, the connecting pipe is rigid, and the coupling member is connected to the x-y table to move in the x-y direction.

As the connecting pipe is rigid and the coupling member including the projection is connected to the x-y table to be displaced in the x-y direction, the handling is simplified, thereby ensuring the release time of the coupling and the reduction of production time.

As the work piece clamp in the working position is fixed in the z direction by the safety device, it ensures that the work piece clamp and the bottom clamping plate cannot rise above the x-y table at the work position of the work piece clamp.

Two exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Other objects, features and advantages of the present invention will be more clearly understood by the following detailed description with reference to the accompanying drawings.

As shown in Fig. 1, the child buttonhole sewing machine is C-type; An upper arm 1, a bottom base plate 2 in the form of a housing, and a vertical standard 3 integrating the two members. The arm shaft 4 is typically arranged on the arm 1 and can be driven by a drive motor (not shown). The drive portion of the needle bar 5 may be disposed vertically in the z direction and includes a needle 6; Therefore, a jogging drive is usually derived from the arm shaft. The hook bearing 7 is arranged on the base plate at the bottom of the needle bar 5 and the needle 6, and can be rotated around the vertical axis 8. The drive of the hook bearing 7 is typically derived from the arm shaft 4.

the x-y table 9 is arranged on the base plate 2; It is a transverse slide which can be displaced in two horizontal coordinate directions, i. The x-y table 9 is typically buried, as disclosed, for example, in DE 198 07 771 A1 (corresponding to US Pat. No. 6.095.066). the operation of the x-y table 9 is made by the x driver and the y driver; Such a drive is preferably a stepper motor such as an electric positioning motor, preferably a controllable direct current motor or the like. This drive is not shown.

The bottom clamping plate consisting of two members is arranged on the xy table 9, and only the right bottom clamping plate 10 is shown in FIGS. 1 and 2, which is self-supported on the xy table 9 for displacement in the x direction. It is. Such a design is disclosed in EP 1 354 993 A2 (corresponding to US patent application Ser. No. 10/410/467) which is incorporated herein by reference. Each bottom clamping plate 10 is part of the workpiece clamp 11. The bottom clamping plate 10 covers the hook bearing 7 and must be removed when hooking threads or spirals. In FIG. 2 the work piece clamp on the left side of the needle 6 is not shown, but is arranged in mirror symmetry of the work piece clamp 11 opposite the needle 6. Only the working member clamp 11 on the right side of the needle 6 will be described.

Each work piece clamp 11 comprises a double arm bearing lever 12, which consists of a pivoting lever 13 and a sliding lever 14. At its free end side, the sliding lever 14 comprises an upper clamping plate 15. The pivoted lever 13 is arranged in the drive section and bearing case 17 and is pivoted around the pivot axis 16. By means of screws 18, the case 17 is fixed to the lower side of the bottom clamping plate 10. By its contact area, the two parts are integrated into a liquid seal (not shown) for sealing the compressed air. The pivoted lever 13 and the sliding lever 14 are operatively connected longitudinally with respect to each other in the y direction by the sliding and locking connection 19.

The case 17 is part of the clamping drive 20 for the work piece clamp 11. The case 17 includes a continuous cylindrical chamber 21 whose bottom is opened by the bottom clamping plate 10 and the top is closed, and a piston 22 is disposed therein for sealing and downward movement. The piston (22) comprises a piston rod (23); This piston rod projects downward from the cylindrical chamber 21 and is segmented by the joint 24 to the facing end of the pivotal lever 13 of the bearing lever 12. The compressed air supply duct 26 is formed in the case 17 on the side of the cylindrical chamber 21 and is connected to the cylindrical chamber 21 by an overflow channel 27 on top of the case 17. At the bottom of the case 17, the compressed air hose 28 is connected to a compressed air supply duct 26 and to a solenoid valve, which is an electromagnetically actuated 3/2 port control valve 29. As can be appreciated from the above description, the clamping drive unit 20 is a piston-cylinder unit which is unilaterally operated by compressed air.

The preloaded tension spring 30 is fixed near the end 25 of the pivotal lever 13, and the other end of the spring 30 is mounted on the upper side of the case 17, so that the bearing lever 12 ) Rises together with the upper clamping plate 15 to the bottom clamping plate 10 when the piston 22 is not loaded from the top by compressed air. However, if compressed air acts on the piston 22 from the top, the sliding lever 14 of the bearing lever 12 is pressed against the bottom clamping plate 10 together with the upper clamping plate 15, and the working member during operation. 31 is clamped between the upper clamping plate 15 and the bottom clamping plate 10.

The compressed air hose 28 is connected to the case 17 by a releasable hose coupling 32. For this purpose, the support plate 33 is mounted by the screw 34 at the bottom side of the x-y table 9 and extends in parallel with the bottom clamping plate 10 to the bottom of the case 17. By means of the elbow hose connection 35, the compressed air hose 28 is fixed to the support plate 33 which is stationary relative to the x-y table 9. The hose coupling 32 itself is composed of a hopper portion 36 connecting the compressed air supply duct 26 and a connecting hose 37 passing through the hopper portion 36 and the duct 26. The hopper part 36 extends downward toward the support plate 33. When connected, the flexible resilient connecting hose 37 passes through the hopper portion 36 in the z direction into the compressed air supply duct 26, which is supplied by the ring seal 38 to the case 17. 4, a compressed air seal connection is created between the compressed air hose 28 and the compressed air supply duct 26. Thus, the hopper portion 36 is a receptacle of the coupling member, while the connection hose 37 is a projection of another coupling member inserted into the receptacle in the z direction. The design of the portion 36 in the hopper strongly facilitates the insertion and centering of the connecting hose 37.

When the bottom clamping plate 10 is removed upward from the xy table 9 together with the work piece clamp 11, it is connected to the xy table via the support plate 33, the elbow hose connection 35 and the connecting hose 37. The compressed air hose 28 stays on the base plate 2 of the sewing machine; The work piece clamp 11, the bottom clamping plate 10 and the clamping drive 20, including the hopper portion 36 and the ring seal 38, are retracted upward from the connecting hose 37. As a safety device of the work clamp 11 and the bottom clamping plate 10 which inadvertently raises the xy table, the clamping plate 10 is attached to a support rib 39 which is fixed to the bottom of the pivotal lever 13. Is fixed by. The support ribs 39 may for example be heads of fixing screws. As shown in Figs. 3 and 4, in the operating position shown in the figure, the support ribs 39 back up the support plate 33 near the edge 33a shown in dashed lines in Fig. 3. When the cylindrical chamber 21 is vented, the bearing lever 12 is in an upwardly pivoted position by the load of the prestressed tension spring 30, so that the support ribs 39 no longer support the support plate 33. Do not back up. As a result, the bottom clamping plate 10, i.e., the work member clamp 11, is moved slightly in the y direction in the x-y table and then rises upward in the z direction.

As described above, the bottom clamping plate 10 can be displaced in the x-y table 9 by a short distance in the x direction, which is caused from the design of the sewing machine as an eye button sewing machine. This fine displacement in the x direction is carried out by the sliding drive 40, in which only the drive lever 41 is shown in the figure, acting as the bottom clamping plate 10. As described above, the bottom clamping plate 10 can be moved in the xy plane because the connecting hose 37 in the hopper part 36 corresponds to the bottom opening area of the hopper part 36 in the x direction and the y direction. This is because it can be deformed laterally. This movement is several millimeters in the x and y directions.

In another embodiment of the hose coupling 32 ′ according to FIGS. 6 and 7, the sliding part 42 taking the form of a plate is supported by the support plate 33 ′ in the xy plane for displacement of the clamping plate 10 as described above. ) Is mounted. For this purpose, the sliding part 42 comprises a bolt 43; The bolt protrudes downward and passes through a hole 44 perforated in the support plate 33 '; The hole 44 has a diameter slightly above the diameter of the bolt 43 and there is a corresponding play 45 in the x and y directions. The sliding portion 42 is fixed with a circlip 46 to prevent the rise, and the circlip is mounted to the bolt 43 at the bottom of the support plate 33 '.

The elbow hose connection 35 ′ of the compressed air hose 28 passes through a hole 47 drilled in the support plate 33 ′, and the elbow hose connection 35 and some play corresponding to the play 45 therebetween. (48) exists. The elbow hose connection part 35 ′ is mounted on the sliding part 42 and is tightly integrated with the connection pipe 49 inserted firmly and upwardly and inserted into the hopper part 36 of the case 17. According to the displacement of the bottom clamping plate 10 in the x and y directions, the connecting pipe 49 is xy with respect to the support plate 33 ′ firmly connected to the xy table 9 together with the case 17 and the sliding part 42. Move in the plane. This movement is absorbed and compensated for by the flexible compressed air hose 28.

The fact that a releasable coupling is provided between the pneumatic piston-cylinder drive and the compressed air hose makes it easier to control the work piece clamp with the bottom clamping plate covering the hook bearing. Similarly, the connection can also be produced easily. The production and release of the coupling is made by the action of the workpiece clamp upon removal and placement, if necessary. The coupling members are mutually coupled in operation, i.e. they do not have to be held against each other by corresponding forces in the case of monotonous adjustment of the coupling members.

1 is a partial side cross-sectional view of a child buttonhole sewing machine.

2 is an enlarged cross-sectional view of the sewing machine according to line II-II of FIG.

Figure 3 is an enlarged cross-sectional view of the sewing machine according to the arrow III-III of FIG.

4 is a cross-sectional view taken along the line IV-IV of FIG. 3, showing a bottom clamping plate equipped with a clamping drive.

5 is a perspective view of a drive bearing case of a clamping drive;

FIG. 6 is an enlarged view corresponding to FIG. 4, showing a second embodiment of a coupling member mounted on an x-y table. FIG.

FIG. 7 shows a coupling member according to line VII-VII of FIG. 6.

[Explanation of symbols on the main parts of the drawings]

1: arm 2: base plate

6: needle 7: hook bearing

9: x-y table 28: hose

30: spring 31: working member

32: coupling 33: support plate

36: hopper section

Claims (9)

In the eye buttonhole sewing machine, Base plate (2), A needle 6 which can be driven in the z direction by the arm shaft 4, A hook bearing 7 disposed in the lower part of the needle 6 in the base plate 2, An x-y table 9 disposed on the base plate 2 and displaceable in the x and y directions,  at least one working member clamp 11 mounted to the x-y table 9 for displacement in the x direction and displaceable by the sliding drive 40; A clamping drive 20 mounted to the bottom clamping plate 10 and composed of a pneumatic piston-cylinder drive for operation of the upper clamping plate 15, A compressed air hose (28) connected to the clamping drive (20) for supplying compressed air to the clamping drive (20), The work piece clamping (11) comprises a bottom clamping plate (10) detachable in the z direction upward from the x-y table (9) and attachable to the x-y table (9) from the top to the z direction; The work member clamping (11) comprises an upper clamping plate (15) segmented into a bottom clamping plate (10); The compressed air hose (28) is releasably connected to the clamping drive (20) by hose couplings (32, 32 '); The hose couplings 32, 32 ′ comprise a coupling member connected to the clamping drive 20 and a coupling member connected to the compressed air hose 28; The coupling member includes a receptacle; Another coupling member may be inserted into the receptacle in the z direction to form a coupling coupling and includes a protrusion that can be released in the z direction from the receptacle to release the coupling coupling. Buttonhole sewing machine. The eye button sewing machine according to claim 1, wherein the hose coupling (32, 32 ') comprises a play movable in the x-y direction. The eye button sewing machine of claim 1, wherein the coupling member including the receptacle is formed in the clamping drive unit (20). 2. The eye button sewing machine of claim 1, wherein the coupling member including the receptacle comprises a hopper portion (36) extending outwardly. The eye button sewing machine according to claim 1, wherein the protrusion is a flexible connection hose (37). The eye button sewing machine according to claim 2, wherein the protruding coupling member is a connecting pipe (49). 7. The child buttonhole sewing machine according to claim 6, wherein the connecting pipe (49) is rigid. 7. A child buttonhole sewing machine according to claim 6, characterized in that the coupling member comprising the projection is connected to the x-y table (9) for displacement in the x-y direction. 2. The child-type buttonhole sewing machine according to claim 1, wherein the working member clamp (11) is fixed in the z direction by a safety device in the operating position.