TWM543252U - Sewing machine and sewing machine assembly - Google Patents

Abstract

A sewing machine comprises a needle bar (6) for mounting a sewing needle. A needle bar frame (33) serves for guiding a movement of the needle bar (6). A feeding foot bar (16) serves for mounting a feeding foot (12). A feeding foot bar guide (34) serves for guiding an axial movement of the feeding foot bar (16). A guiding component (35) is connected to the needle bar frame (33). A counter guiding component (39) is connected to the feeding foot bar (16). Such counter guiding component (39) is in direct guiding connection with the guiding component (35). Result is a sewing machine in which an unwanted relative movement between transport components and components of the sewing machine fixed to the housing is avoided.

Description

Sewing machine and sewing machine components Cross-reference to related applications

The content of the German utility model patent application DE 202015 104 412.7 is incorporated herein by reference.

New field

The present invention relates to a sewing machine and a sewing machine assembly, and more particularly to a sewing machine having a needle bar for mounting a needle, a needle bar frame for guiding movement of the needle bar, and a feed leg for mounting a feed foot.

New background

Such a sewing machine is known from EP 2 105 526 B.

New summary

The present invention proposes a sewing machine and a sewing machine assembly. In accordance with an embodiment of the present invention, it is an object of the present invention to develop a sewing machine of the foregoing kind such that undesired relative movement between the transfer member and the member of the sewing machine secured to the housing can be avoided.

According to the novel, the object is achieved by a sewing machine having a feed foot guide for guiding the axial movement of the feed foot And a guide member coupled to the needle bar frame and an opposing guide member coupled to the feed foot bar, the opposed guide member being in direct directing connection with the guide member.

It will be appreciated in accordance with the present invention that the feed foot guide improves the stability of the feed foot so that undesired play motion of the feed foot relative to other components of the sewing machine can be specifically avoided. In particular, undesired rotation of the feed foot about the axis of the feed foot is avoided.

The elongated guide opening extending in the direction of the axis of the feed leg makes it possible in particular to ensure the guiding of the feed foot.

The bolts fixedly coupled to the feed foot provide a stable opposing guide member that is inexpensive to produce.

Attaching to the bolt and abutting the slide of the guiding member in guiding the feed foot allows the feed foot to be guided with a lower amount of wear. The slider can be made of plastic.

Another object of the present invention is to create a feedstock stem guide that can be retrofitted.

This further object is achieved according to the novel by a sewing machine assembly for guiding the axial displacement of a feed foot of a sewing machine, the sewing machine assembly having a guiding member connectable to the needle bar frame and an opposite guiding member connectable to the feeding foot bar, The guiding member is for guiding movement of the needle bar, and the opposing guiding member is in direct directing connection with the guiding member.

With this sewing machine assembly, it is possible to retrofit an existing sewing machine. The guiding member and the opposing guiding member of the sewing machine assembly can be designed as previously described in connection with the sewing machine according to the present invention.

1‧‧‧shell

2‧‧‧ column

3‧‧‧ Arms

4‧‧‧ head

5‧‧‧Bear axis

6‧‧‧ Needle bar

7‧‧‧ needle

8‧‧‧ stitch hole

9‧‧‧track board

10‧‧‧Down holding device

11‧‧‧ Pressing feet

12‧‧‧Feeding feet

13‧‧‧Fan device

14‧‧‧Fan shaft

15‧‧‧First fan shaft rotating rod

16‧‧‧Feeding rod

17‧‧‧Pressure rod

18‧‧‧Second fan shaft rotating rod

19‧‧‧Loading bolts

20‧‧‧Fan shaft cam disc

21‧‧‧Motor shaft

22‧‧‧ Distance stepper motor

23‧‧‧Fan shaft control curved wall

24‧‧‧ Lifting height adjustment device cam disc

25‧‧‧ flat head screws or threaded pins

27‧‧‧Support bolts

28‧‧‧ Lifting height adjustment device rotating rod

29‧‧‧Uplift gear shaft

30‧‧‧ Lifting height adjustment device

31‧‧‧Uplift gear

32‧‧‧(Oscillating drive) lifting shaft

33‧‧‧ Needle bar frame

33’‧‧‧Uplifting cam

34‧‧‧Feeding foot guide

35‧‧‧Guiding components

36, 37‧‧‧ Remote connection point

38‧‧‧Slim guide hole

39‧‧‧ Opposite guiding members

40‧‧‧ bolt

41‧‧‧Sliding parts

42‧‧‧Compression spring

43‧‧‧fork spring parts

44, 47‧‧‧Transfer rod

45, 48‧‧‧ drawbar

46‧‧‧Triangle pole

49‧‧‧ pivot axis

50‧‧‧Loading rod

An exemplary embodiment of the present invention is described in more detail below with reference to the accompanying drawings.

Fig. 1 schematically shows a partially open casing of a sewing machine seen from the rear; Fig. 2 shows a perspective view of an assembly of a mechanical member of a sewing machine having a fan device and a lift height adjusting device, the fan device Ventilation of the lower holding device of the sewing machine for the specified conveying lift of the lower holding device; FIG. 3 shows a view of the assembly seen from the direction of view of FIG. 2, wherein the drive is omitted a member rod and the addition of other members such as a threaded rod, wherein the guiding member of the feed foot guide for guiding the axial displacement of the feed foot rod is omitted at a lower position of the feed foot rod; FIG. 4 is shown in FIG. A view of a similar assembly having a mounting member for a feed foot guide; FIG. 5 shows the assembly according to FIG. 4 from a different perspective; FIG. 6 shows a view of the assembly similarly to FIG. There is a feed foot in the maximum lift position (ie, the venting position); and Figure 7 shows the assembly according to Figure 6 as seen from the perspective of Figure 5.

Detailed description

The housing 1 of the sewing machine is shown in Fig. 1, the sewing machine having a column 2, an arm 3 and a head 4, the column 2, the arm 3 and the head 4 together not in Fig. 1 The substrates shown together make the sewing machine have a generally C-shaped structure. The needle shaft 6 on which the organic needle 7 is mounted is driven up and down by an arm shaft 5 that is not driven by the main driver shown in the drawing. The needle 7 passes through a stitch hole 8 in the track plate 9, which forms a part of a support plate, not shown, which in turn represents the upper side of the substrate of the sewing machine.

The sewing machine has a downward holding device 10 for holding and conveying the sewing material downward during sewing, the downward holding device being divided into a pressing foot 11 and a feeding foot 12. The presser foot 11 is used to hold (press) the sewing material downward during sewing. The feed foot 12 is for conveying the sewing material in a sewing direction parallel to the longitudinal extension direction of the stitch sheet 9.

In order to ventilate the down holding device 10, a fan unit marked with the numeral 13 is used. The fan unit has a fan shaft 14, on the sewing foot side, the first fan shaft rotating lever 15 is fixedly coupled to the fan shaft in a rotationally fixed manner (not rotatable). The first fan shaft swivel lever 15 is in turn hinged by a feed lug 16 of the lower holding device 10 and a connecting member of the presser foot lever 17 which is not clearly shown in the drawing. At a free end of the fan shaft 14 opposite the first fan shaft rotating lever 15, a second fan shaft rotating lever 18 is fixedly disposed in rotation. The load bearing bolt 19 of the second fan shaft rotating lever 18 is pressed against the fan shaft cam plate 20 by a pretensioning spring not shown in the drawing.

2 shows the neutral position of the fan assembly 13 in which the fan shaft cam disc 20 is oriented such that the support bolt 19 takes a minimum distance from the motor shaft 21 of the stepper motor 22. The fan shaft cam plate 20 is fixedly coupled to the motor shaft 21 in rotation. The fan shaft control curved wall 23 of the fan shaft cam disc 20 on which the support bolt 19 is carried is spirally wound around the longitudinal axis of the motor shaft 21 extend.

In addition to the fan shaft cam disc 20, the lift height adjustment cam disc 24 is arranged to be rotationally fixedly coupled to the motor shaft 21. Each of the cam discs 20, 24 has a cam disc segment that is coaxial with the motor shaft 21 and a spiral cam disc segment that continuously abuts the cam disc segment.

The cam discs 20, 24 are fixedly fixed to the motor shaft 21 in rotation by a grub screw or a threaded pin 25, which is shown in an exploded view in the drawing. Various other shaft members of the assembly shown in Figure 2 are rotationally fixed using corresponding grub screws or threaded pins 25. The two cam discs 20, 24 are members of the same shape.

The support bolt 27 of the lift height adjustment device rotation lever 28 abuts against the lift height adjustment device cam plate 24 by a pretensioning spring which is not shown in the drawing.

The lift height adjustment device rotary lever 28 is rotationally fixedly coupled to the lift pinion 29 of the lift height adjustment device generally designated by numeral 30. The lift pinion 29 is operatively coupled to the oscillating drive lift shaft 32 of the lift height adjustment device 30 by a lift gear 31. Together with the lifting cam 33' disposed on the arm shaft 5, the lifting gear 31 affects the lifting height of the conveying stroke of the feed foot 12 and the presser foot 11.

The arm shaft 5, the fan shaft 14, the motor shaft 21, the lift gear shaft 29, and the lift shaft 32 all extend in parallel with each other.

To guide the movement of the needle bar 6, a needle bar frame 33 is used (see Figs. 3 to 7). Movement of the needle bar 6 includes up and down movement along the longitudinal axis of the needle bar 6 And the feeding movement in the sewing direction.

To guide the axial movement of the feed foot 16, a feed foot guide 34 is used (see Figure 4). The feed foot guide 34 includes a guide member 35 in the form of a guide bridge that is coupled to the needle bar frame 33, which is removed in the view of FIG. 3, ie not shown. In the illustrated embodiment, the guide member 35 is securely coupled to the needle bar frame 33 at both ends, i.e., at the distal attachment points 36, 37, and threaded together.

The guiding member 35 has an elongated guiding aperture 38 in its body that extends parallel to the feed foot 16 .

The elongated guide aperture 38 thus extends along the axial direction of the feed foot 16 . The feed foot guide 34 also includes an opposing guide member 39 that is coupled to the feed foot 16 and that is directly guided into engagement with the guide member 35.

The opposing guiding member 39 includes a bolt 40 that is securely coupled to the feed foot 16 . The annular slide 41 is mounted on a bolt 40 which is also part of the opposing guide member 39. The slider 41, not shown in FIG. 3, is carried on the guiding member 35 during the guiding of the feed leg 16, that is to say on the inner wall of the elongated guiding hole 38. The slider is made of plastic.

Figures 3 to 5 show the feed foot lever 16 in the maximum lowered position in which the opposing guide members 39 in the guiding member 35 are moved downward to the maximum position. At the same time, in the position according to Figs. 3 to 5, the presser foot 17 is also moved downward to the maximum position. The displacement is achieved by a pretensioned tight compression spring 42 which is in a push-to-engage relationship with the presser foot 17 via the forked spring member 43. The lifting displacement of the feed foot 16 passes through the wind The fan shaft 14 and the lift shaft 32 are transmitted. For this purpose, a rod connection is used together with the transfer rod 44, which is fixedly connected in rotation to the lifting shaft 32 and to the draw rod 45, which in turn acts on the triangular rod 46, which passes through the hinge An additional transfer rod 47 is coupled to the feed foot rod 16 whose hinge axis coincides with the longitudinal axis of the bolt 40.

The drawbar 48 is used to transmit a driving force for lifting the needle bar 6 up and down.

In order to produce a feed motion of the feed foot 16 and the needle bar 6, a vibration drive, not shown, for the needle bar frame 33 is used, which is derived from the arm shaft 5. The needle bar frame 33 pivots about a pivot axis 49 extending parallel to the arm axis along which the axially and radially mounted carrier bar 50 extends on the housing 1 of the sewing machine.

Figures 6 and 7 show the feed foot guide 34 being raised to the maximum position of the feed foot 16 . The opposing guiding member 39 is moved upward to the position at which the guiding member 35 is raised to the maximum value. In this position, the compression spring 42 is compressed to a maximum by the spring member 43.

The feed foot guide 34 effectively prevents undesired pivoting of the feed foot 16 about its longitudinal axis.

The feed foot guide 34 can be retrofitted to an existing sewing machine. To this end, the sewing machine assembly can be provided as a retrofit unit comprising a guiding member 35 and a slide 41. After the respective connecting members are attached to the needle bar frame 33 and the bolts 40, the guiding members 35 and the sliders 41 can be mounted and the guiding foot guides 34 are ready for use.

5‧‧‧Bear axis

6‧‧‧ Needle bar

16‧‧‧Feeding rod

17‧‧‧Pressure rod

32‧‧‧(Oscillating drive) lifting shaft

33‧‧‧ Needle bar frame

33’‧‧‧Uplifting cam

34‧‧‧Feeding foot guide

35‧‧‧Guiding components

36, 37‧‧‧ Remote connection point

38‧‧‧Slim guide hole

39‧‧‧ Opposite guiding members

40‧‧‧ bolt

41‧‧‧Sliding parts

42‧‧‧Compression spring

43‧‧‧fork spring parts

44, 47‧‧‧Transfer rod

45, 48‧‧‧ drawbar

46‧‧‧Triangle pole

49‧‧‧ pivot axis

50‧‧‧Loading rod

Claims (5)

A sewing machine having a needle bar for mounting a needle, a needle bar frame for guiding movement of the needle bar, - a feed leg for mounting a feed foot, - characterized in that the sewing machine includes a feed foot guide for guiding axial movement of the feed foot, the feed foot guide having a guide member coupled to the needle bar frame, having an opposing guide member coupled to the feed foot, the opposite guide The member is directly guided to the guiding member. The sewing machine of claim 1, wherein the guiding member has an elongated guiding hole that extends in an axial direction of the feeding leg. The sewing machine of claim 1, wherein the opposite guiding member has a bolt fixedly coupled to the feed leg. The sewing machine of claim 3, wherein the opposite guiding member has a slider coupled to the bolt, the slider abutting the guiding member when guiding the feeding foot. A sewing machine assembly for guiding axial displacement of a feed foot of a sewing machine, having a guiding member connectable to the needle bar frame, the guiding member for guiding movement of the needle bar, having a connection with the feeding foot bar The opposite guiding member is directly guided and connected to the guiding member.