JP2003181174A - Pressure regulator for sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure regulator for a sewing machine capable of regulating a pressure at the tip of a presser bar. <P>SOLUTION: The pressure regulator for the sewing machine is provided with a presser bar 7 vertically movably supported by a sewing machine frame 1 and energized downwards, change members 14 and 16-18 capable of changing energizing force to the presser bar, presser feet 36, 46 and 56 fixed on the tip side of the presser bar, pressers 34, 44 and 54 whose center parts are turnably connected to the presser feet, and an elastic member 5 whose one end side energizes a presser tip side. The pressure regulator for the sewing machine is provided with regulating members 23, 49 and 55 arranged on the rear side of connection parts 34a, 44a and 54a of the presser feet and the pressers, movably supported by the pressers and capable of being in contact with the presser feet by movement. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a presser foot adjusting device for a sewing machine.

[0002]

2. Description of the Related Art An example of the structure of a conventional presser foot adjusting device for a sewing machine will be described with reference to FIG. In the figure, the presser foot 4 is arranged above the needle plate 2 and the feed dog 3 and is for pressing down the cloth (not shown) by applying downward pressure (pressing pressure) to the cloth. The presser foot adjusting device is a mechanism for adjusting the presser foot pressure of the presser foot 4. This presser foot adjusting device includes a presser bar 7 supported by a presser bar attaching portion 1a of a sewing machine frame 1 so as to be slidable in a substantially vertical direction, a presser foot 6 fixed to the tip end side of the presser bar, and the presser foot. 6, a presser foot 4 rotatably supported around a central connecting portion 4a, a front presser foot spring (elastic member) 5 attached to the presser foot, one end side of which biases the presser tip side. Is equipped with.

A presser foot pressure adjusting base 15 is attached above the presser bar attaching portion 1a by a presser foot pressure adjusting base set screw 13. A presser foot pressure adjusting arm 16 is rotatably attached to the presser foot pressure adjusting base 15 via a presser foot pressure adjusting arm shaft 19. A presser foot pressure adjusting knob 17 is rotatably attached to the presser foot pressure adjusting base 15.

A pressing pressure adjusting cam 18 is fixed to the pressing pressure adjusting knob 17, and a convex portion 16a is provided on the pressing pressure adjusting arm 16. The pressing pressure adjusting cam 18 and the convex portion 16a are always in contact with each other, and When the pressure adjusting knob 17 is rotated, the pressing pressure adjusting arm 16 is vertically rotated along the shape of the cam with the pressing pressure adjusting arm shaft 19 as a fulcrum.

A presser bar holder 8 is fixed to the center of the presser bar 7, and a presser spring 12 is provided between the presser bar holder 8 and the presser pressure adjusting base set screw 13 and a presser pressure adjusting base set screw 13 is provided.
The presser foot pressure adjusting springs 14 are arranged between the presser foot pressure adjusting arms 16 through the presser bar 7.

A presser foot lifting lever 10 is rotatably attached to a presser foot lifting lever mount 9 fixed to the sewing machine frame 1 via a presser foot lifting lever shaft 11. The presser bar lifting lever 10 is always in contact with the presser bar holding body 8, and when the presser bar lifting lever 10 is rotated, the presser bar 7 and the presser bar 4 are moved up and down.

When the presser foot pressure adjusting knob 17 is rotated, the presser foot pressure adjusting arm 16 is vertically rotated about the presser foot pressure adjusting arm shaft 19. Thereby, the spring pressure of the presser foot pressure adjusting spring 14 can be adjusted. When sewing or cloth sewing occurs, the presser foot pressure adjusting knob 17 is rotated to change the presser foot pressure.

[0008]

However, in the presser foot adjusting device of the conventional sewing machine, the presser foot 4 is rotatably connected to the presser foot 6, and the front presser foot spring 5 attached to the presser foot 6 is used.
Since the pressure is applied to the tip of the presser foot 4, even if the presser foot pressure is adjusted by the presser foot pressure adjusting knob 17, the connecting portion 4 with the presser bar 7 is
Although the presser foot pressure of the presser foot 4 near a changes, the presser foot pressure at the tip of the presser foot 4 is kept substantially constant by the front presser foot spring 5.
For this reason, it is not possible to deal with the occurrence of any sewing due to the large presser pressure at the tip of the presser foot 4. An object of the present invention is to provide a presser foot adjusting device for a sewing machine capable of adjusting the presser foot pressure of the presser foot.

[0009]

In order to achieve the above object, according to the present invention, a sewing machine frame is supported so as to be vertically movable,
A presser bar that is urged downward, a changing member that can change the urging force applied to the presser bar, a presser foot that is fixed to the tip side of the presser bar, and a center part that can be rotated by the presser foot. A presser foot adjusting device for a sewing machine, comprising: a presser foot connected to the presser foot, and an elastic member attached to the presser foot, one end side of which biases the presser foot tip side, There is provided a presser foot adjusting device for a sewing machine, characterized in that the presser foot adjusting device is provided on a side and is movably supported by the presser foot, and includes an adjusting member that comes into contact with the presser foot by the movement and raises a tip of the presser foot. . At least one of the contacted surfaces where the presser foot and the adjusting member come into contact is inclined.

Preferably, a stop member is provided for stopping the adjusting member at either one of an initial position away from the presser foot and a setting position in contact with the presser foot.

More preferably, the adjusting member is rotatably supported by a support shaft provided on the presser and is fixed by a fixing member fixed to the presser,
And a lever provided with an abutment surface rotatably supported by the support shaft and capable of contacting the presser foot, and setting the adjusting member by adjusting a fixing position of the adjusting plate by the fixing member. The position can be changed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a presser foot adjusting device according to the present invention will be described below with reference to the drawings.

1 to 9 show a first embodiment of the present invention. The presser foot adjusting device of this embodiment is shown in FIG.
It has almost all the configuration of the conventional example shown in FIG. First, of the same or similar constructions as those of the conventional example, those relating to the present invention will be briefly described with reference to FIG. 7. This presser foot adjusting device of the sewing machine is supported by the sewing machine frame 1 so as to be vertically movable,
The presser bar 7 that is urged downward, the changing members 14, 16 to 18 that can change the urging force to the presser bar 7, the presser foot 36 that is fixed to the tip end side of the presser bar 7, and the presser foot. Foot 36
A presser foot 3 having a central connecting portion 34a rotatably connected to
4 and the elastic member 5 attached to the presser foot 36, and one end side of which presses the tip end side of the presser foot 34. Other same elements or parts are designated by the same reference numerals (1 to 1) as in FIG.
19) is attached and the description is omitted.

In the present embodiment, an adjusting plate (lift lever adjusting plate) 22 is fixed by a set screw (fixing member) 21 behind the connecting portion 34a of the presser foot 34 and the presser foot 36. A lift lever 23 is rotatably mounted on the lift lever adjusting plate 22 by a lift lever shaft (support shaft) 24. The lift lever shaft 24 is a step screw fixed to the presser 34 as shown in FIG. 6A, and the lift lever adjustment plate 22 and the lift lever 23 are rotatably loosely fitted to the lift lever shaft 24. .

A hole 23a is provided in the lift lever 23, and a lift lever fixing spring 25 is built in the hole 23a. A lift lever fixing ball 26 is fixed to the tip of the lift lever fixing spring 25. The lift lever adjusting plate 22 and the lift lever 23 form an adjusting member.

As shown in FIG. 6B, the lift lever adjusting plate 22 has two holes 22a and 22b. Each of these holes 22a and 22b has a size such that the lift lever fixing ball 26 can be inserted in about half thereof, and the lift lever fixing ball 26 is urged downward by the lift lever fixing spring 25.
Is inserted into one of the two holes 22a and 22b, the lift lever 23 is held at that position.

The lift lever 23 and the presser foot 36 are provided with inclined portions 23b and 36a, respectively.
When the lift lever fixing ball 26 is in the hole 22a,
This is the initial position where the contact surface 23c of the inclined portion 23b and the contacted surface 36b of the inclined portion 36a do not contact. Further, when the lift lever fixing ball 26 is in the hole 22b, the contact surface 23c of the inclined portion 23b (see FIG. 8) and the inclined portion 36b.
The contact surface 36b of a is in the set position where it makes contact. The holes 22a and 22b, the lift lever fixing spring 25, and the lift lever fixing ball 26 form a stop member that stops the lift lever 23 at the initial position and the set position.

Next, the operation of the presser foot adjusting device having the above construction will be described. In the normal state (initial position), as shown in FIG. 8A, the flat surface portion 34b of the presser foot 34 is in contact with the throat plate 2, and as shown in FIG. 23b and the inclined portion 36 of the presser foot 36
a is not in contact.

When it is desired to reduce the pressing pressure at the tip of the presser foot 34 in order to deal with the occurrence of any sewing problem, the lift lever 23 is rotated counterclockwise in FIGS.
When the inclined portion 23b of the lift lever 23 is brought into contact with the inclined portion 36a of the presser foot 36 as shown in FIG. 9B, FIG.
As shown in FIG. 3, the presser foot 34 rotates with the connecting portion 34a of the presser foot 34 and the presser foot 36 as the fulcrum, and the tip of the presser foot rises. Become. As a result, any sewing can be eliminated, and beautiful sewing can be performed.

Further, as shown in FIG. 6B, the hole 22c for the set screw 21 of the lift lever adjusting plate 22 is a long hole, and the set screw 21 is loosened to lift the lift lever within the range of the long hole 22c. Lift lever adjusting plate 22 centered on the shaft 24
It is possible to adjust the fixing position by rotating and fixing again with the set screw 21. When the fixed position of the lift lever adjusting plate 22 is adjusted in this manner, the contact position of the inclined portions 23b and 36a moves, so that the amount of rise of the tip of the presser foot 34 changes, and thus the presser pressure of the tip of the presser foot 34 can be adjusted. it can.

In the present embodiment, the inclined portion 23b,
Since the rising amount of the tip of the presser foot 34 is adjusted by using the inclination of 36a, the presser foot pressure can be easily adjusted.

Next, a second embodiment of the present invention will be described with reference to FIG. In the presser foot adjusting device of this embodiment, the presser foot 44 is provided with a convex portion 48 having a screw hole 47, and a lift screw 49 is inserted into the screw hole 47. A taper hole 50 is formed in the presser foot 46. The lift screw 49 constitutes an adjusting member.

In a normal state, the lift screw 49 does not enter the taper hole 50 (initial position). Therefore, FIG. 8 (A)
Similarly to the above, the plane portion of the presser foot 44 is in close contact with the needle plate 2. When sewing is performed in this state and some stitching occurs, and when it is desired to raise the tip of the presser foot 44 in order to cope with this, the lift screw 49 is turned into the taper hole 50 and the contact surface 50a of the taper hole 50 is inserted. Contact (set position). Then, similarly to the case shown in FIG. 9A, the presser foot 44 is rotated with the connecting portion 44a of the presser foot 44 and the presser foot 46 as a fulcrum,
Since its tip rises, a gap is created between it and the needle plate 2,
The pressing pressure at the tip of the presser 44 is reduced. As a result, any sewing can be eliminated, and beautiful sewing can be performed.

Next, a third embodiment of the present invention will be described with reference to FIG. In the presser foot adjusting device of this embodiment, a slide lever 55 having an inclined contact surface 55a is slidably attached to the presser foot 54, and when the slide lever 55 is slid, the contact surface 55a is attached to the presser foot 56. The configuration is such that it can contact the inclined contact surface 56a. The slide lever 55 constitutes an adjusting member.

In a normal state, the contact surface 55a of the slide lever 55 is not in contact with the contacted surface 56a of the presser foot 56 (initial position). Therefore, as in the case shown in FIG. 8A, the flat portion of the presser 54 is in close contact with the needle plate 2. When sewing is performed in this state and some stitching occurs, and when it is desired to raise the tip of the presser foot 54 to cope with this, the slide lever 55 is slid to bring the contact surface 55a into contact with the contacted surface 56a (setting). position). Then, as in the case shown in FIG. 9A, the presser 54 is rotated around the connecting portion 54a of the presser 54 and the presser foot 56 as a fulcrum, and the tip of the presser 54 rises, so that a gap is formed between the presser plate 2 and the needle plate 2. The pressing pressure at the tip of the presser 54 becomes small. As a result, any sewing can be eliminated, and beautiful sewing can be performed.

In any of the above-described first to third embodiments, the pressers 34, 44, 54 that can be replaced with one touch are all available.
Since the adjusting members 23, 49, 55 are added to the side, a changing member that can change the adjustment value of the presser pressure adjusting knob 17, that is, the urging force to the presser bar 7 even when the pressers 34, 44, 54 are replaced. The biasing force of 14, 16-18 does not change.

Although the presser foot adjusting device of the present invention has been described based on the first to third embodiments, the present invention is not limited to these embodiments and can be variously modified.

For example, in the first embodiment, both the contact surface 23c of the inclined portion 23b of the lift lever 23 and the contacted surface 36b of the inclined portion 36a of the presser foot 36 are inclined. Although shown, only one of them may be inclined. Similarly, in the third embodiment, an example is shown in which both the contact surface 55a of the slide lever 55 and the contacted surface 56a of the presser foot 56 are inclined, but only one of them is inclined. It may be configured to.

Further, in the second embodiment, instead of the lift screw 49, a pin capable of moving forward and backward in the tapered hole 50 may be used.

[0030]

According to the present invention, a presser bar supported by a sewing machine frame so as to be vertically movable and urged downward, a changing member capable of changing the urging force applied to the presser bar, and A presser foot fixed to the tip side of the presser bar, a presser foot whose center portion is rotatably connected to the presser foot, and an elastic member attached to the presser foot, one end side of which biases the presser foot side. In the presser foot adjusting device including a sewing machine, the presser foot is arranged behind the connecting portion between the presser foot and the presser foot, is movably supported by the presser foot, and contacts the presser foot by the movement,
Since the adjusting member for raising the tip of the presser foot is provided, it is possible to adjust the pressing pressure of the presser tip end by raising the presser tip end side by bringing the adjusting member into contact with the presser foot.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of a presser foot adjusting device of a sewing machine according to the present invention.

FIG. 2 is a plan view of the first embodiment.

FIG. 3 is a side view of the first embodiment.

FIG. 4 is a plan view of a main part of the first embodiment.

FIG. 5 is a side view of a main part of the first embodiment.

6A is a sectional view taken along line XX of FIG. 4, and FIG. 6B is a plan view of a lift lever adjusting plate.

FIG. 7 is a partial cross-sectional view showing the overall configuration of the first embodiment.

8A and 8B show a state when the lift lever of the first embodiment is in an initial position, FIG. 8A is a side view, and FIG. 8B is a contact surface of the lift lever and a contact surface of the presser foot. .

FIG. 9 is a side view of the setting position and the lift lever in the first embodiment when the lift lever is in the initial position.
(B) is the contact surface of the lift lever and the contact surface of the presser foot.

FIG. 10 is a second view of the presser foot adjusting device according to the present invention.
2A is a perspective view and FIG. 3B is a sectional view.

FIG. 11 is a third view of the presser foot adjusting device of the sewing machine according to the present invention.
3 is a perspective view of the embodiment of FIG.

FIG. 12 is a partial cross-sectional view showing an overall configuration of a presser foot adjusting device of a sewing machine according to a conventional example.

[Explanation of symbols]

1 sewing machine frame 5 Front presser foot spring (elastic member) 7 Presser bar 14, 16-18 change member 21 Set screw (fixing member) 22 Lift lever adjustment plate (adjustment plate) 22a, 22b, 26 Stop member 23 Lift lever 23c, 55a abutting surface 24 Lift lever shaft (support shaft) 34,44,54 Presser foot 34a, 44a, 54a Connection part 36,46,56 Presser foot 36b, 50a, 56a Contacted surface 49 Lift screw (adjustment member) 55 Slide lever (adjustment member)

Claims (4)

[Claims] 1. A presser bar supported by a sewing machine frame so as to be movable up and down and urged downward, a changing member capable of changing the urging force applied to the presser bar, and fixed to the tip side of the presser bar. A presser foot, a presser foot whose center portion is rotatably connected to the presser foot, and an elastic member attached to the presser foot, one end side of which biases the presser tip side. In the presser foot adjusting device, an adjusting member that is disposed behind a connecting portion between the presser foot and the presser foot, is movably supported by the presser foot, and comes into contact with the presser foot by the movement to raise the tip of the presser foot. A presser foot adjusting device for a sewing machine, comprising: 2. The presser foot adjusting device according to claim 1, wherein at least one of the contact surfaces where the presser foot and the adjusting member come into contact with each other is inclined. . 3. The presser foot adjusting device according to claim 1, wherein the adjusting member is stopped at either one of an initial position separated from the presser foot and a setting position where the presser foot comes into contact with the presser foot. A presser foot adjusting device for a sewing machine, comprising a stop member. 4. The presser foot adjusting device according to claim 1, 2, or 3, wherein the adjusting member is rotatably supported by a support shaft provided in the presser foot and fixed to the presser foot. An adjusting plate fixed by a member, and a lever rotatably supported by the support shaft and provided with an abutment surface capable of contacting the presser foot, and a fixing position of the adjusting plate by the fixing member. A presser foot adjusting device for a sewing machine, wherein the setting position of the adjusting member can be changed by adjusting.