TWI591228B - Thread cutting assembly for an eyelet sewing machine - Google Patents

Description

Tangent assembly for a buttonhole sewing machine Cross-reference to related applications

The content of the German patent application DE 10 2012 205 049.3 is incorporated herein by reference.

Technical field

The present invention relates to a tangent assembly for a ballhole sewing machine.

Background technique

A sewing machine of the type known from the prior art can be used as disclosed in the prior art.

The invention further relates to a ball-end keyhole sewing machine with a tangential assembly of this type and a method of producing a round-eye keyhole using this type of ball-end keyhole sewing machine. DE-PS 169 689 describes the configuration of a tangential assembly for a buttonhole sewing machine.

Summary of invention

It is an object of the invention to develop a tangential assembly of the type mentioned at the beginning of the article, which makes it possible to improve the reliability of the tangential line and to reduce the need to manually cut the protruding line after the production of the eyelet eyelet has been completed. The possibility of the head.

The object according to the invention is achieved by a tangential assembly for a ballhole sewing machine: - the tangential assembly comprises at least two pairs of seaming bodies on the underside and a seaming clip on the upper side, wherein each pair comprises a seam a material body and a sewing material clip, the two pairs of parts being configured to hold the sewing material between the sewing material body and the sewing material holder, wherein the sewing material holder is each Constructed to be displaceably (movably) movable relative to the associated sewing material body, wherein - each of the sewing material holders has a groove region recess located in the area of the round keyhole stitch, thereby Enabling a round-eye keyhole stitch opening in which a sewing tool can cooperate (fit) to sew a round-eye stitching seam, the tangential assembly comprising a thread cutter, the tangential assembly comprising a pairing a thread cutter (opposing thread cutter) that cooperates with the thread cutter to cut at least one stitching line, wherein - the thread cutter and the mating thread cutter are configured to at least also be in the round headhole line Collaboration in the track area, where the line cutter Constructed to be displaceably driven, wherein - at least one of the slot clips is configured to be in a displacement path of the thread cutter when it is in the clamped position - wherein the slot clip is in the Another configuration is positioned outside of the displacement path of the thread cutter when it is in the clamped position.

According to the present invention, the cutting reliability of the tangential component can be recognized It can be improved because the tangential mechanism with the tangential cutter and the mating tangential cutter is configured such that the two cooperating tangents can also cooperate with each other in the round keyhole stitch area to cut the line. This ensures that after the round eyelet seam is sewn, the protruding thread head can be reliably grasped by the thread cutter and cut off. In particular, it is also conceivable to design the tangential assembly such that the components of the slat clamping element and the thread cutter do not interfere with each other. Such an arrangement - at least one of the slot clamps is within the displacement path or region of the thread cutter at the clamped position and the other of the slot clamps is displaced at the thread cutter at the clamped position Outside the path or area - such that one of the slot clamps remains in the clamped position when the thread cutter is displaced, so that the seam can still be reliably clamped during the thread cutting.

The tangential cutter is disposed to be located on one of the at least two sewing material clips, or the mating tangential cutter is at least partially under the other of the at least two sewing material clips, the tangential line The arrangement of the components makes the assembly compact. The mating tangential cutter may also be at least partially disposed in the recess of one of the at least two seam clips and flush with the seam collet.

The mating tangential cutter has a cutting edge (cutting edge) profile adapted to an outer contour of the rounded keyhole stitching region, the cutting edge contour enabling the cutting edge of the mating tangential cutter to be in the mating tangential cutter In the case of a configuration that obstructs the round eyelet seam, it extends into the round keyhole stitch area.

The tangential cutter has a cutting edge profile adapted to the cutting edge contour of the mating tangential cutter, the cutting edge contour of the tangential cutter making the cutting process reliable. The cutting edge profile of the thread cutter may have, at least in part, a stroke (route) parallel to the cutting edge contour of the mating tangential cutter.

The advantages of a ball-end keyhole sewing machine with a tangential assembly according to the invention correspond to the advantages already explained with reference to the tangential assembly according to the invention.

It is possible to flexibly use a sewing machine configured to be capable of sewing a buttonhole of a round head and a buttonhole for sewing, and in particular, can be configured to sew a buttonhole of a round head.

A method for producing a round keyhole using a sewing machine according to the present invention for producing a round keyhole, the method comprising the steps of: clamping an inserted sewing material on a pair of lower side sewing body bodies and Between the seam clamps on the upper side, - sewing the round eyelet seam with at least one stitching line, - releasing at least one seam clip - the seam clip is in the displacement path of the thread cutter when in the clamped position The slit clamp that has been released thus exits the displacement path of the thread cutter, while at least one other seam clamp positioned outside the displacement path of the cutter is still clamped when in the clamped position Positioning - cutting at least one stitching line by shifting the thread cutter from a neutral position to a cutting position in the rounded keyhole stitching area relative to the mating cutter, releasing at least one has not been released On the one hand, this method ensures a reliable cutting of the sewing line in the area of the buttonhole of the round head, and on the other hand ensures that the sewing thread can be reliably clamped while the sewing line is being cut. The removal of one of the seam clips from the displacement path or region of the thread cutter ensures that the two components do not interfere with each other during the production of the keyhole keyhole. Shift path of the tangential cutter when in the clamped position The sewing material can be held in the clamping position while the at least one sewing line is cut within the diameter or the area, and the clamping pressure can be reduced at this time with respect to the clamping pressure during sewing, or during the tangential line Open the sewing clip.

In the production method of the keyhole keyhole, the order in which the round eyelet seam and the round keyhole itself are formed is irrelevant. Therefore, it is possible to form a seam first, then cut out the hole, or to cut the keyhole of the round head first, and then sew the round eyelet seam.

1‧‧‧ top arm

2‧‧‧Substrate

3‧‧‧Frame

4‧‧‧Bear axis

5‧‧‧ Needle bar

6‧‧‧ needle

7‧‧‧Workbench

8a, 8b‧‧‧ support plate

9a, 9b‧‧‧ sewing clips

10‧‧‧Support structure

11a, 11b‧‧‧ sewing material body

13‧‧‧ Cutting device

14‧‧‧Cutter unit

15‧‧‧Upper cutting block

16‧‧‧Cutting drive

17‧‧‧Connectors (joints, hinges)

18‧‧‧With arms

19‧‧‧Connectors

20‧‧‧Sliding/rotating hinges

21‧‧‧Driver

22‧‧‧ Guide bearing

23‧‧‧ horizontal pivot axis

24‧‧‧ receiving board

25‧‧‧Spherical bearing surface

26‧‧‧ fixing screws

27‧‧‧Base parts

29‧‧‧ sewing material

30‧‧‧ Round head keyhole stitch area

31a, 31b‧‧‧ Rectangles in the stitch area

32‧‧‧ Round head keyhole opening

32a, 32b‧‧‧ Retracted area of the stitch area

33‧‧‧Thread cutter

34‧‧‧ Pairing cutter

35‧‧‧Scissors shaft

36‧‧‧ cutting joint

37, 38‧‧‧ blades

39‧‧‧ Round buttonhole stitch area

40‧‧‧Clamped recess

40a‧‧‧Regression area

40b‧‧‧Protruding

41‧‧‧Driver

42‧‧‧ drive shaft

43, 44‧‧‧ drive recess

45‧‧‧ Round head button hole seam

46‧‧‧ Round head seam

47‧‧‧foot stitching

48‧‧‧ Round buttonhole incision

49‧‧‧ Terminal area

50‧‧‧ Round head eyeliner

51‧‧‧ round head keyhole

52‧‧‧End area

One embodiment of the invention will be shown in more detail with the aid of the drawings. In the drawings: Figure 1 shows a longitudinal view of a round-headed sewing machine with a knob and a buttonhole cutting device, partially showing internal details; Figure 2 shows the illustration according to Figure 1 respectively Figure 2 shows a plan view of the tangential assembly of the tangential assembly of the knurled sewing machine, on the lower side, the tangential cutter and the counter tangential cutter; Figure 3 shows the components of the tangential assembly according to Fig. 2 in the assembled position, wherein The thread cutter is in a neutral position; Figure 4 shows a thread cutter in a cutting position similar to Figure 3; Figure 5 shows a plan view of a tangent assembly with more components, in particular with a slot clamp, where the tangent Figure 6 shows a view similar to Figure 5 with the thread cutter in an intermediate position between the open position and the cutting position; Figure 7 shows the blade of the cutter and the paired cutter of Figure 6 An enlarged view of the detail in the area of the edge profile of the end side; Figure 8 shows a view similar to Figure 5, wherein the tangential cutter of the assembly is in the cutting position; Figure 9 shows a round buttonhole seam with a rounded buttonhole cut; and Figure 10 shows the belt A round-headed eyeliner with a rounded keyhole.

detailed description

It can be inferred from Fig. 1 that the round keyhole and buttonhole sewing machine is C-shaped, i.e., the sewing machine has a top arm 1, a lower casing-like substrate 2, and a substantially vertical frame 3 connecting the two. The sewing mechanism causes the buttonhole of the round head to be sewn and the buttonhole to be sewn, in particular, the buttonhole hole for sewing. The arm shaft 4, which can be driven by a drive motor, not shown, is mounted in the arm 1 in a conventional manner. An arrangement of this type of drive motor in this type of sewing machine is known from DE 102 25 511 C1 and DE 102 25 512 C1. The drive and vibration drive of the vertically displaceable needle bar 5 with the needle 6 originate from the arm shaft 4 in a conventional manner.

In order to facilitate the display of the positional reference of the components of the sewing machine, a Cartesian xyz coordinate system is drawn in the drawing. The x direction in Figure 1 is perpendicular to the plane of the drawing and extends beyond the plane of the paper. The y direction extends to the right side of the figure such that the x-y plane is parallel to the plane of the substrate 2 and parallel to the stitching plane. The Z axis extends upward in Figure 1, in other words, vertically.

The x-y table 7 is disposed on the substrate 2, wherein the x-y table 7 is thus a cross slide that is displaceable in two horizontal coordinate directions, namely the x direction and the y direction. The x-y table 7 is constructed in a conventional manner, for example from DE 198 07 771 C1 (corresponding to US 6,095,066). The x-y table 7 is driven by means of a drive device not shown, namely an x-driver and a y-driver. The drive device is a positionable motor in a conventional manner and is therefore generally a stepper motor, but can also be a controllable DC motor. A configuration of this type is known from DE 102 25 511 C1 and DE 102 25 512 C1.

Two-piece support plates 8a, 8b are provided on the x-y table 7. Those of these two-piece components that face the viewer of Figure 1 have an additional indicia "b". Components that are remote from the viewer and that are not visible in Figure 1 and are partially shown in other views have an additional indicia "a". The support plates 8a or 8b of the respective portions are assigned to the sewing material clips 9a or 9b, which are respectively assigned to the clamping bodies 11a, 11b of the support structure 10, wherein the supporting structures 10 are attached to the respective supporting plates 8a or 8b. The details of the construction and drive means of the seam clamps 9a, 9b are known from DE 102 16 808 C2 (corresponding to US 6,722,299 B2), to which extent the document is hereby incorporated.

Viewed in the y-direction after the needle bar 5, a round-eye keyhole and buttonhole cutting device 13 is observed, the cutting device 13 having a lower cutter that is stationary perpendicular to the substrate 2, in other words in the z-direction Unit 14 and upper cutting block 15. The cutting block 15 is provided with a cutting drive 16 which is embodied as a multistage pneumatically activatable piston-cylinder drive and is shown and described in detail in DE 102 25 511 C1 and DE 102 25 512 C1. The cutting drive 16 passes through the frame 3. A lower end of the cutting drive 16 is fixed in the substrate 2 by means of a joint (joint, hinge) 17. The other upper end of the driver 16 is connected to the two-armed rod 18 by means of a joint 19, which in turn is linked to the drive rod 21 by means of a sliding/rotating hinge 20, the drive rod 21 being at least disposed in the arm 1 A guide bearing 22 is vertically displaceably guided. The two-armed lever 18 is pivotable about its horizontal pivot axis 23 mounted in the arm 1 generally at its center.

The lower cutter unit 14 has a receiving plate 24 which is fixed to the base member 27 of the substrate 2 by means of a spherical bearing surface 25 and fixing screws 26. The receiving plate 24 can be oriented by means of this type of fixing, in particular around a predetermined axis in the y direction and around an axis which is predetermined by the x direction and which extends horizontally and transversely to this direction.

Sewing machines which have been shown and described here are known from DE 103 04 821 B3 and EP 1 722 021 A1.

Details of the tangent assembly of the ballhole sewing machine will be described below with the aid of FIGS. 2 to 8. Two pairs of parts belong to the assembly, wherein each pair of parts respectively includes one of the sewing splints 11a, 11b on the lower side as a sewing material body, and includes one of the sewing material clips 9a, 9b on the upper side as a pairing Sewing material body. These paired members are designed to clamp the sewing material 29 between the sewing material holders 11a, 11b and the associated sewing material clips 9a, 9b, respectively (refer to Fig. 1).

For clamping, the sewing material clips 9a, 9b are each configured to be displaceably drivable relative to the associated sewing material body 11a, 11b, respectively, by means of a sewing material, which is not shown.

The sewing material bodies 11a, 11b respectively have partial circular stitch area recesses 31a, 31b located in the keyhole stitching area 30 (see, for example, Figs. 3 and 7). These stitch region recesses 31a, 31b regionally define a round keyhole stitch opening 32 in which the sewing tool, in other words the needle 6 and not shown and disposed on the support plate The lower loopers cooperate to sew the round keyhole (see Figure 10). A round keyhole stitch opening 32 is created in which the sewing tool can cooperate to sew the round keyhole.

The corresponding stitch region recesses 32a, 32b may have sewing clips 9a, 9b (for example) For example, refer to Figures 5 and 7).

A two-piece tangential mechanism with a thread cutter 33 and a mating tangential cutter 34 is also a tangential assembly. The tangential mechanism is configured as a scissor, and the tangential cutter 33 and the mating tangential cutter 34 are pivotable about a common pivot or scissor shaft 35 of the cutting joint 36.

The cutting joint 36 is arranged to be spaced apart from the round buttonhole stitch area 39 shown by the dashed line in FIG.

The round keyhole stitch area 30 is the rounded portion of the round buttonhole stitch area 39. The cutters 33 and the blades 37, 38 of the mating cutter 34 are sufficiently long that the blades 37, 38 can also cooperate with one another in the knobhole stitching area 30 shown by the dashed line in FIG.

In the assembled tangential assembly, the thread cutter 33 is disposed above the sewing material body 11a. During the cutting displacement of the thread cutter 33 from, for example, the neutral position shown in Fig. 3 to the cutting position shown in Fig. 4, the blade 37 of the thread cutter 33 passes over the upper side of the sewing material body 11a.

The mating tangential cutter 34 is partially disposed below the sewing material body 11b, and is then partially mounted in the body recess 40 on the side of the stitch region of the sewing material body 11b.

The blade 38 of the counter tangler 34 has a cutting profile which on the one hand is adapted to the contour of the stitching recesses 31a, 31b of the sewing material body 11 and on the other hand to the contour of the sewing material clip 9. To this end, one end of the blade 38 of the counter tangential cutter 34 is constructed with a partially circular retracted region 40a (see Fig. 7).

In particular, it can be inferred from the enlarged view of FIG. 7 that the cutting profile of the blade 37 of the thread cutter 33 is adapted in a complementary manner to the cutting profile of the blade 38 of the mating thread cutter 34. To this end, one end of the blade 37 is designed with a projection 40b which is constructed in a complementary manner to the retracted region 40a. Cutting treatment During this, the thread cutter 33 and the mating cutter Threader 34 are thus parallel to each other in the region of the retreat area 40a and the projection 40b. Both the retreat area 40a of the blade 38 and the projection 40b of the blade 37 protrude into the round keyhole stitch area 30.

The blades 37, 38 can also extend in a variation of the tangential assembly, not shown, to cover the entire round keyhole stitch area 30.

When the tangential mechanism is moved from the neutral position (refer to FIGS. 3 and 6) to the cutting position (see FIGS. 4 and 8), the mating tangential 34 is also pivoted about the cutting joint 36 to the buttonhole stitch region 39. The scissors movement is driven by a drive rod 41 that can be pivotally driven about a drive shaft 42 that is parallel to the scissors shaft 35 and parallel to the z-axis. For this purpose, the drive lever 41 engages the lever arm opposite thereto on the one hand in the drive recess 43 of the thread cutter 33 and on the other hand in the drive recess 44 of the mating thread cutter 34. The drive shaft 42 is disposed to be spaced apart from the scissors shaft 35.

The sewing material clip 9a is disposed in a displacement region between the neutral position of the thread cutter 33 and the cutting position when in the clamped position. The other seam clip 9b is disposed outside the displacement area of the thread cutter 33 and outside the displacement area between the neutral position of the mating cutter 34 and the cutting position.

9 and 10 schematically show the sewing results of the sewing machine. In Figs. 9 and 10, the slit clips 9a and 9b for clamping the sewing material from above are also schematically shown. Figure 9 shows a round buttonhole seam 45 sewn in a round buttonhole stitch region 39 with a rounded seam portion 46 and a foot seam portion 47 and a rounded head. Button hole cutout 48. In this case, the thread cutting mechanism cuts the thread end in the starting region of the wire slit 45 or in the terminal region 49. This can be done regularly by means of the blade portion of the blades 37, 38 adjacent to the scissors shaft 35.

Figure 10 shows a rounded keyhole seam 50 with a rounded keyhole 51 sewn in the round keyhole stitch area 30. The tangential mechanism cuts the thread in the starting region or end region 52 of the round eyelet seam 50, in this respect by means of the end portion of the blade 37 of the thread cutter 33, and on the other hand by means of the mating cutter 34 The end portion of the blade 38 is realized.

In order to produce the round buttonhole hole, a round buttonhole hole slit 45 is first produced in the round buttonhole stitch region 39, and then the round buttonhole hole slit 48 is cut by the cutting device 13. The thread cutter 33 then cuts the thread head protruding from the round buttonhole slit 45. For this purpose, the sewing material clip 9a located in the displacement region displaced by the thread cutter 33 during the tangential line is released before the thread cutting head is cut, so that the displacement region for the thread cutter is in the sewing material clip 9a and the sewing material holder The body 11a becomes free between. The other sewing clip 9b is held in the clamped position. The sewing material clip 9b is capable of applying a full clamping pressure to the sewing material 29, in other words, the clamping force applied to the sewing material 29 during sewing is a reduced clamping pressure. In other variations, the other seam clip 9b is also released prior to cutting the thread.

Similarly, the sewing machine 8 can also produce a round buttonhole. To this end, a round eyelet seam 50 is formed and then punched out of the knob eye 51 by a cutting device 13. The sewing material clip 9a is then released while the other sewing material clip 9b is held in the clamped position. The tangential mechanism initially held in the neutral position is now moved to the cutting position, and the line head of the round eyelet seam 50 is cut out in the starting area or terminal area 52 of the seam.

Finally, the sewing material clip 9b which has not been released is also released, so that the sewing material 29 can be taken out.

In addition to the tangential lines, details of the sewing and cutting process can be found in EP 1 722 021 A1.

9a, 9b‧‧‧ sewing clips

11a, 11b‧‧‧ sewing material body

31a, 31b‧‧‧ Rectangles in the stitch area

32‧‧‧ Round head keyhole opening

32a, 32b‧‧‧ Retracted area of the stitch area

33‧‧‧Thread cutter

34‧‧‧ Pairing cutter

37, 38‧‧‧ blades

40a‧‧‧Regression area

40b‧‧‧Protruding

Claims (8)

A tangential assembly for a buttonhole sewing machine, the tangential assembly comprising at least two pairs of such components, that is, each pair of members includes a seam clip on a lower side and a seam clip on an upper side, At least two pairs of members are configured to hold the sewing material between the sewing material body and the sewing material holder, wherein the sewing material clips are each configured to be associated with an associated sewing material The collet is displaceably driven, wherein - the collet members each have a stitch region recess in the area of the keyhole stitch, thereby enabling the creation of a round keyhole stitch opening in the circle The first keyhole opening in the sewing tool can cooperate to sew the round eyelet seam, the tangential assembly includes a tangential cutter, and the tangential assembly includes a mating tangential cutter that cooperates with the tangential cutter to cut At least one stitching line, wherein the thread cutter and the mating tangential cutter are configured such that the thread cutter and the mating tangential cutter cooperate at least also in the round keyhole stitch area, wherein The thread cutter is configured to be displaceably Driving, wherein - at least one of the slot clips is configured such that the slot is in a displacement path of the thread cutter when clamped in a clamped position, wherein - at least one of the slot clips Constructed such that the sewing material is positioned in the displacement path of the thread cutter when clamped in the clamped position outer. The assembly of claim 1, wherein the thread cutter is disposed on one of the at least two seam clips. The assembly of claim 1, wherein the mating tangential cutter is disposed at least partially under the other of the at least two seam formers. The assembly of claim 1, wherein the mating tangential cutter has a cutting edge profile adapted to an outer contour of the round keyhole stitch region. The assembly of claim 1, wherein the thread cutter has a cutting edge profile adapted to a cutting edge profile of the mating tangential cutter. A ball-end keyhole sewing machine having the tangent assembly according to item 1 of the patent application. According to the sewing machine of the sixth aspect of the invention, the sewing machine is configured to be used for sewing a keyhole of a round head and for sewing a buttonhole. A method of producing a keyhole for a round head according to the sewing machine of claim 6, wherein the method comprises the steps of: - clamping the inserted sewing material between the pair of parts, each pair of parts The pair includes a sewing material clip on the lower side and a sewing material clip on the upper side, - sewing the round eyelet seam with at least one sewing thread, releasing in the displacement path of the thread cutter in the clamping position At least one seam clip such that the released staple clip leaves the cut a displacement path of the threader, while at least one other seam clip positioned outside the displacement path of the thread cutter in the clamped position remains in the clamped position - by relative to the mating cutter The tangential cutter is displaced from a neutral position to a cutting position in the rounded keyhole stitching region to sever the at least one stitching line, releasing the at least one seaming clip that has not been released.