JP2001038079A - Cloth pressing device for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a cloth cutting knife for forming a hole from being in contact with an object to be sewn at the time of sewing an elastic thick object to be sewn by a buttonhole sewing machine. SOLUTION: The cloth presser 20 of this cloth pressing device of the buttonhole sewing machine is provided with a cloth presser body part 21 and a cloth presser rear part 22. The cloth presser body part 21 has a shape almost similar to a conventional cloth presser, however, the cloth presser rear part 22 is successively formed integrally with the cloth presser 20 at the rear part of the cloth presser body part 21. Then, the cloth presser rear part 22 is formed so as to cover the lower side of the cloth cutting knife 17 in the state of being most separated from the cloth presser body part 21 by the forward movement of the cloth presser body part 21. Thus, at the time of sewing the elastic thick object to be sewn, the object to be sewn raised at the rear part of the cloth presser body part is prevented from being in contact with the cloth cutting knife 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth presser for a sewing machine provided with a cloth cutting knife or upper thread cutting scissors,
In particular, the present invention relates to a cloth presser of a buttonhole sewing machine.

[0002]

2. Description of the Related Art In general, a buttonhole overlock sewing machine is known which cuts a workpiece and forms a hole such as a buttonhole in the workpiece and performs overlock sewing around the hole of the workpiece. I have. The sewing machine holds an object to be sewn between a needle for performing overlock stitching, a cloth feed for feeding a sewing object in a cloth feeding direction, and a cloth feeding side (lower side) by pressing the cloth feeding side. A cloth presser for moving a workpiece along the cloth feed direction along with the cloth feed, a cloth cutting knife for forming a button hole in the workpiece pressed by the cloth presser, and cutting the upper thread after the sewing is completed. It has upper thread cutting scissors.

For example, as shown in FIG. 10, the cloth presser 1 is attached via a presser foot 3 to a distal end of a presser arm 2 which can move up and down and can move in the cloth feeding direction. . The cloth presser 1 has a substantially rectangular shape long in the cloth feeding direction, a needle penetrates up and down, and a rectangular long hole 4 long in the cloth feeding direction. Has become. Therefore, the presser foot 1 is formed in a rectangular frame shape. The length of the presser foot 1 in the cloth feed direction (longitudinal direction) is substantially equal to the length of the presser foot 3 in the cloth feed direction.

The long hole 4 is slightly wider than the widest buttonhole overlocking range of the buttonhole overlocking performed by using the presser foot 1. The presser foot 1 is formed in a state in which members having substantially the same width are arranged around the long hole 4, and the long hole 4 is formed substantially at the center of the presser foot 1. . In addition,
The presser foot 3 is attached to the presser arm 2 so that the presser foot 3 can move up and down, and the cloth presser 1 is connected to the presser foot 3 so that it can be tilted right and left. Therefore, the cloth presser 1 can be tilted back and forth and right and left according to the condition of the upper surface of the workpiece.

[0005] The cloth cutting knife is arranged at a position behind the needle, and is moved downward by a cloth presser and a cloth feeder in a state where the button hole forming position of the sewing object is arranged below the cloth cutting knife. To form a buttonhole. Therefore, the cloth presser and the cloth cutting knife can be moved back and forth relatively to each other. Then, when the cloth presser moves forward and separates from the cloth cutting knife on the rear side of the needle, the cloth cutting knife is placed outside the rear of the range above the cloth presser. The upper thread cutting scissors are arranged, for example, from the outside of the side of the presser foot toward the center side of the presser foot, and the upper thread cutting scissors are rotationally moved.
The upper thread is cut.

As an upper thread trimming device provided with such upper thread trimming scissors, for example, the one shown in FIG. 11 is known. The upper thread cutting device shown in FIG. 11 includes an upper thread cutting scissor 8 and a later-described base end 8 of the upper thread cutting scissor 8.
B, a link member 9a for supporting the link member 9a, an operating lever portion 9b for rotatably supporting the link member 9a in a horizontal direction and a vertical direction, and the link member 9a arranged substantially in parallel with the link member 9a. A coil spring 9c for urging the presser arm 2;
Push-up lever 9d that regulates movement by being biased by
When the thread cutting scissors 8 are rotated as described later,
Cam members 9e and 9e 'provided on the cloth presser side for opening and closing the thread cutting scissors 8 are provided.

The upper thread cutting scissors 8 are fixed to a fixed blade 8a.
And a scissor body 8A having a movable blade 8b rotatable with respect to the fixed blade 8a, and a base end extending upward from a rear portion of the scissor body 8A and connected to the link member 9a. 8B. In addition, upper thread cutting scissors 8
As described later, the distal end of the link member 9a is
When it is pivotally moved to the side, it is pivotally moved (turned) together with the link member 9a so as to advance toward the center of the work clamp 1. At this time, a part of the upper thread cutting scissors 8 comes into contact with the cam member 9e ', and the movable blade 8b which is open with respect to the fixed blade 8a moves so as to close to the fixed blade 8a side. By this operation, the upper thread cutting scissors 8 cut the upper thread extending from the sewing object.

The upper end of the link member 9a has the upper thread cutting scissors 8 attached thereto, and the rear end of the link member 9a abuts against the push-up lever 9d serving as a stopper to resist the urging force of the coil spring 9c. A stopper abutting portion 9f for maintaining the link member 9a in a position substantially parallel to the holding arm 2 is provided. The link member 9a is rotatably supported in a horizontal direction and a vertical direction by an operation lever portion 9b at a central portion from a rear end portion. Therefore,
In such a needle thread cutting device, the push-up lever 9d is moved to move the push-up lever 9d and the link member 9 to each other.
By releasing the contact a with the stopper contact portion 9f, the distal end of the link member 9a moves toward the holding arm by the urging force of the coil spring 9c. Thereby, the link member 9a
Needle thread cutting scissors 8 attached to the tip of
The upper thread cutting scissors 8 are operated by the cam member 9e 'to cut the upper thread as described above.

[0009] The needle thread cutting scissors 8 of this type are
The portion excluding the tip portion is disposed on one side outside the presser foot 1, and is rotatable with the link member 9a on the side.

[0010]

By the way, in the buttonhole overlock sewing machine described above, not only the buttonhole of clothes but also the overhole sewing of a belt through hole of a child seat may be performed. The portion of the child seat where the belt through hole is formed is, for example, a sponge-like sewing object having elasticity and thickness including sponge or the like. As shown in FIG. 12, when the thick and elastic sewing object 5 like the sponge-like sewing object is pressed by the cloth presser 1, the sewing object 5 is pressed by the cloth presser 1. The part becomes elastically deformed and becomes thinner in a state where it is crushed downward. In the vicinity of the sewing object 5 outside the presser foot 1, the presser foot 1
The thickness of the sewn material 5 becomes greater as the distance from the sewn material increases.

Here, as shown in FIG. 12, the cloth cutting knife 7 arranged behind the needle 6 causes the cloth presser 1 to move forward in the cloth feed direction, thereby causing the cloth presser 1 to move rearward in the range of the cloth presser 1. In particular, when the presser foot 1 and the cloth cutting knife 7 are in the most distant state, the sewn material in a state in which the presser foot 1 is moved rearward from the presser foot 1 and rises higher than the presser foot 1. There was a case where the lower end of the cloth cutting knife 7 came into contact with 5. In such a state, the sewing object 5 is
, Which may lead to a decrease in yield and the like.

Further, as shown in FIG. 13, in the case of a buttonhole overlock sewing machine having the above-described upper thread trimming scissors 8 protruding from the presser foot 1 on the side of the presser foot 1, In some cases, the upper thread cutting scissors 8 come into contact with the workpiece 5 in a state of being raised from the cloth presser 1 to the side away from the side 1. In such a case, the upper thread trimming scissors 8 in contact with the workpiece 5 may be a resistance to the movement of the workpiece during cloth feeding.

The present invention has been made in view of the above circumstances, and in a sewing machine having a cloth cutting knife or a needle thread cutting scissor, when sewing a thick sewing object having elasticity, a cloth is added to the sewing object. An object of the present invention is to provide a cloth presser of a sewing machine that does not come into contact with a cutting knife or upper thread cutting scissors.

[0014]

According to a first aspect of the present invention, there is provided a cloth presser for a sewing machine according to the present invention, as shown in FIGS. 1 and 4, along a cloth feeding direction of a needle (15) for performing sewing. In a sewing machine having a cloth cutting knife (17) that moves up and down, a presser arm (3
0), a presser foot (31) attached to the distal end portion of the presser arm (30), and a lower portion of the cloth cutting knife attached below the presser foot (31) and operated by the presser arm. A presser foot (20) that can move back and forth along the cloth feed direction and presses the workpiece downward. The presser foot is provided with the presser foot. A presser foot main body (21) having a front-rear length substantially the same as the front-rear length along the cloth feed direction, and a presser foot rear portion (22) formed on the rear side of the presser foot main body (21).
The cloth presser moves relatively rearward with respect to the cloth presser main body in a state where the cloth presser presses a thick sewing object having elasticity and the cloth presser moves forward. Then, on the rear side of the presser foot, the sewn material in a state of being raised above the presser foot without being pressed by the presser foot reaches the height of the cloth cutting knife at the ascending position. The rear part of the presser foot presses a sewing object behind the main body of the presser foot so as not to come into contact with the cloth cutting knife.

According to the above construction, in a state where the cloth presser presses a thick sewing object having elasticity, and the cloth presser advances, the cloth cutting knife moves rearward with respect to the cloth presser main body. When relatively moved, on the rear side of the presser foot, the sewn object in a state of being raised above the presser foot without being pressed by the presser foot is the cloth cutting knife in the raised position. Since the rear part of the presser foot presses the work to be sewn behind the main body of the presser so that the cloth scalpel does not come into contact with the cloth cut scalpel, the cloth cut scalpel and the work to be sewn come into contact with each other. Thus, the quality of the sewn product and the yield can be improved by preventing the sewn product from being damaged by the cloth cutting knife.

When the cloth cutting knife forms a hole such as one button hole, the cloth cutting knife forms the hole in a single cut, but the hole is formed in a plurality of cuts such as two times. It may be formed. Also, the presser foot main body of the presser foot
Basically, it has the same size and size as the conventional presser foot, and the present invention has substantially the same configuration as the conventional presser foot with the rear part of the presser foot attached thereto.

Further, the rear part of the presser foot may be formed separately from the main body of the presser foot, and may be disposed behind the main body of the presser foot. However, the cost of the sewing machine and the labor saving of assembling work are taken into consideration. In this case, it is preferable that the presser foot main body portion and the rear portion of the presser foot are integrally formed. In other words, it is preferable to form a rear portion of the presser foot behind the main body of the presser foot so as to extend the main body of the presser foot rearward.

According to a second aspect of the present invention, there is provided a presser foot device for a sewing machine, as shown in FIG. A needle thread trimmer (18), at least a part of which is movable or at least a part of which is disposed at a position protruding from a range above the presser foot main body on the side of the presser foot, is provided; A side portion (23) of the presser foot formed on the side of the presser foot main body, wherein the presser foot presses a thick elastic sewing object, and When at least a part of the presser foot protrudes to the side from the range above the presser foot main body, the side of the presser foot is above the presser foot without being pressed by the presser foot. The upper thread trimmer is added to the The cloth presser side portion presses the work on the side of the cloth presser main body so that the work does not contact the upper thread cutting scissors even when the cloth approaches. I do.

According to the above construction, even when the upper thread trimming scissors approach the sewn material which is raised above the cloth presser without being pressed by the cloth presser, the sewn material is not affected. Since the side portion of the presser foot presses the sewn object on the side of the main body of the presser foot so as not to contact the upper thread trimming scissors, the cloth cutting scissors contact the thick and elastic sewn object. Then, the work to be sewn can be moved smoothly without obstructing the movement of the work to be sewn at the time of cloth feeding or the like, so that the workability of the sewing work and the quality of the work can be improved. Can be planned.

The above-mentioned upper thread cutting scissors are basically
An upper thread trimmer that cuts the upper thread by rotating and moving to the side of the conventional presser foot. The upper thread trimmer is disposed on the conventional presser foot and comes out of the range of the presser foot. The upper thread cutting scissors which are not included are not included. Further, the side portion of the presser foot may be formed separately from the main body portion of the presser foot, and may be arranged on the side of the main body portion of the presser foot. Preferably, the presser foot main body portion and the presser foot side portion are integrally formed including the above-mentioned rear portion of the presser foot. That is, it is preferable to form the side portion of the presser foot on the side of the main portion of the presser foot so as to extend the main body portion of the presser side.

According to a third aspect of the present invention, there is provided a sewing machine provided with a sewing machine provided with a needle thread cutting scissor, wherein the presser arm is vertically swingable, and is attached to a distal end portion of the presser arm. A presser foot, and a cloth presser attached below the presser foot, and which presses the workpiece downward by the operation of the presser arm. A presser foot main body formed with a long hole in which the needle of the sewing machine moves up and down substantially in the center, and a presser foot side portion formed on the side of the presser foot main body. At least a part of the upper thread cutting scissors is movable to a position protruding from a range above the presser foot main body on one side of the presser presser main body, or is disposed at the above position; In a state where the presser holds a thick sewing object having elasticity, In a state where at least a part of the upper thread cutting scissors is protruded to the side from the range above the presser foot main body portion, the side of the presser foot is not pressed by the presser foot. Even if the upper thread trimming scissors approach the sewing material in a state of being raised above the presser foot, the cloth presser side portions are so arranged that the sewing object does not contact the upper thread trimming scissors. Is characterized in that the material to be sewn is pressed on the side of the cloth presser main body.

According to the above configuration, the same excellent effects as those of the second aspect can be obtained, and the sewing machine having no cloth cutting knife or the arrangement of the cloth cutting knife has elasticity and a thick covering. The present invention can also be applied to a sewing machine arranged so as not to contact a sewing product. In other words, the presser foot of the sewing machine may be provided with a side portion of the presser foot without providing the rear portion of the presser foot.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sewing machine according to an embodiment of the present invention;
Here, before explaining the cloth presser of this example, a sewing machine provided with the cloth presser will be briefly described. The sewing machine shown in FIG. 1 includes a bed portion 11 having a substantially rectangular box shape, a vertical trunk portion 12 provided at a rear portion of the bed portion 11, and an arm extending forward from the vertical trunk portion 12. A sewing machine main body 14 having a portion 13 and a sewing machine table (not shown) provided with a motor (not shown) for driving the sewing machine, on which the sewing machine main body 14 is mounted, are provided.

The sewing machine is provided with a needle bar 16 having a needle 15 which is moved up and down by driving force transmitted from a motor (not shown) and an upper shaft. In addition, the sewing machine is provided with a cloth cutting knife 17 for making a hole such as a button hole in a workpiece when buttonhole sewing is performed, and a well-known driving means (not shown) for driving the cloth cutting knife 17 is provided. Is provided. In addition, the cloth cutting knife 17 and the driving means may form a hole such as a button hole having a predetermined length in the workpiece by one cutting operation, or may perform a plurality of cutting operations such as two times. May be used to form a hole such as a button hole.

The sewing machine is provided with an upper thread cutting scissors 18. The upper thread cutting scissors 18 are for cutting the upper thread between the needle 15 and the workpiece after the overlock sewing is completed. In addition, the upper thread cutting scissors 18 of this sewing machine
A well-known method of cutting an upper thread by performing an operation such as a rotation operation while protruding to the side of a cloth presser body 21 (described later) having a shape substantially similar to that of a conventional buttonhole overlock sewing machine. For example, it is provided in the upper thread trimming device as shown in the above-mentioned conventional example.

The sewing machine is provided with a well-known cloth feed mechanism (not shown) so that the needle 15 can relatively move along the periphery of the button hole when overlocking the periphery of the button hole. The object to be sewn is moved with respect to the needle 15 which is arranged almost fixedly. The basic cloth feed direction is along the longitudinal direction of the buttonhole. The cloth feed mechanism holds the work to be clamped between the cloth presser 20 and the cloth presser 20, which will be described later.
To move the object to be sewn. In FIG. 1, the left-right direction is substantially the cloth feeding direction. In this case, the side of the vertical trunk 12 of the sewing machine (right side in the figure) is the rear side in the cloth feeding direction, and the side of the arm 13 of the sewing machine (left side in the figure). ) Is the front side in the cloth feeding direction.

The presser foot device has basically the same structure as the conventional presser device except for the presser foot 20 according to the present invention. As shown in FIG.
And a presser foot 31 attached to the tip of the presser arm 30.
And a presser foot 20 attached to the presser foot 31. Note that the presser arm 30 is provided with vertical driving means and horizontal driving means (not shown).

The vertical drive means moves the distal end of the presser arm 30 to which the cloth presser 20 is attached at the time of sewing downward, and presses it downward to press the work to be sewn by the cloth presser 20 and to perform sewing. Set and remove things,
At the time of replacement or the like, the distal end portion of the presser arm 30 is raised to release the press operation of the sewing object by the cloth presser 20. The horizontal driving means is for moving the cloth presser in the cloth feeding direction in conjunction with the cloth feeding mechanism.

Next, the cloth presser 20 of the cloth presser will be described. As shown in FIGS. 2 and 3, the presser foot 20 includes a presser foot main body 21, a rear portion 22 of the presser foot, and a side portion 23 of the presser foot. The presser foot main body 21 is a rectangular area surrounded by a lower horizontal solid line, a right vertical solid line, a horizontal virtual line (dashed-dotted line), and a vertical virtual line in FIG. . The presser foot rear portion 22
Is a rectangular area surrounded by an upper horizontal solid line, a right vertical solid line, a horizontal imaginary line, and a vertical imaginary line, and the presser foot side portion 23 includes two upper and lower horizontal solid lines. And a region surrounded by a vertical solid line on the left and a vertical virtual line.

The main body 21 of the presser foot basically has substantially the same shape as that of the conventional presser, and is formed in a rectangular shape long in the cloth feed direction. In the center of the cloth presser main body 21, a rectangular long hole 24 long along the cloth feeding direction is formed as in the related art, and the long hole 24 is provided with a needle as described above. The space 15 moves up and down to form a space for performing overlock stitching.

On the lower surface side of the cloth presser main body 21, a presser section 25 is formed along the periphery of the elongated hole 24. The presser 20 is prevented from slipping. However, the holding portion 25 does not need to be formed in a rectangular frame shape around the rectangular long hole 24.
It may be provided only in a portion along the longitudinal direction of the long hole 24 in the periphery of the long hole 24 on the lower surface. Further, the holding portion 25 may not be provided at all. In the presser foot 20, the cloth presser rear portion 22 is formed behind a presser foot main body portion 21 having substantially the same shape as the conventional presser foot.

The rear part 22 of the presser foot is
1 is a square plate connected to the rear end, and in the first example, the presser foot main body portion 21 and the presser foot rear portion 22 are integrally formed in a continuous state. And, the left and right width of the pressure foot rear portion 22 is, for example, the pressure foot main body 2.
1 and the front and rear lengths are determined as follows. That is, the presser foot rear portion 22 of the first example
As shown in FIG. 4, the front-rear length is from the rear end of the presser foot main body 21 to the rear end of the cloth cutting knife 17 farthest from the presser foot main body 21 as described later. ing.

The presser foot 20 (the presser foot main body 21)
Moves forward and backward along the cloth feed direction, whereas the cloth cutting knife 17 basically does not move back and forth. Therefore, when the cloth presser 20 is most advanced, the cloth presser main body 2 is moved.
1 and the cloth cutting knife 17 are in the state shown in FIG. The cloth presser rear portion 22 is formed so as to entirely cover the part of the sewing material that is vertically overlapped with the cloth cutting knife 17 farthest from the cloth presser main body 21 as shown in FIG. ing. That is, the cloth cutting knife 17
And the front and rear position of the rear end of the presser foot rear part 22 are formed to substantially coincide with each other. In addition,
The presser foot rear portion 22 may be longer toward the rear side, or the feeder rear portion 22 may be slightly shorter as described later in the third example.

The presser foot 20 includes a presser foot main body 21 having substantially the same shape as a conventional presser foot,
On one side of the above-mentioned pressure foot rear part 22, the above-mentioned pressure foot side part 23 is formed. In addition, one side is
The upper thread trimming scissors arranged so as to protrude from the presser foot main body portion 21 as described above are arranged on the side. The presser foot side portion 23 is a rectangular plate connected to one of the side portions of the presser foot main body portion 21 and the presser foot rear portion 22. In the first example, the presser foot side portion 23 is Fabric foot body 21
And, it is formed in a state integrally and continuously with the presser foot rear portion 22. The front and rear length of the presser foot side portion 23 is, for example, a length obtained by combining the presser foot main body portion 21 and the presser foot rear portion 22, and the left and right widths are determined as follows. .

That is, the side portion 23 of the first example of the presser foot is
As shown in FIG. 5, the width between the right and left sides is set from one side edge of the presser foot main body 21 to a rear end of the upper thread cutting scissors 18, which will be described later. The top end of the upper thread cutting scissors 18 is directed toward the presser foot main body 21, and the rear end thereof is directed toward one side of the presser foot main body 21. Similarly to the conventional example, the upper thread trimming scissors 18 extend upward from a scissor main body 18A having a fixed blade and a movable blade (not shown) and a rear end (base end) of the scissor main body 18A (not shown). It has a base end 18B connected to the link member. And the presser foot side portion 23
Is from the front end to the rear end (the base end portion 18) of the upper thread cutting scissors 18.
B) is formed so as to cover the lower side up to B) (the part vertically overlapping the upper thread cutting scissors 18 of the sewing object). Since the upper thread cutting scissors 18 rotate and advance to the presser foot 20 as described in the conventional example, the side section 23 of the presser foot is rotated to advance the upper thread trimmer in a state before the forward movement. It is preferable that the sewing object is covered up to the position of the rear end of the scissors.

It is not always necessary to provide the presser foot side portion 23 on the side of the presser foot rear portion 22, and the presser foot side portion 23 is provided only on the side of the presser foot main body 21. The rear ends of the presser foot side portion 23 and the presser foot main body 21 may be aligned. However, in this case, the entire shape of the presser foot 20 does not become a rectangular shape but becomes a slightly complicated shape. It is preferable that the rear end of the rear portion 22 is aligned. In this manner, as shown in FIG. 2 and the like, the outer shape of the presser foot including the presser foot main body portion 21, the presser foot rear portion 22, and the presser foot side portion 23 becomes rectangular,
It can be easily manufactured. In the above description, the presser foot side portion 23 extends from the front end of the presser foot main body 21 to the rear end of the presser foot rear portion 22, and the presser foot rear portion 22 has the same left and right sides as the presser foot main body 21. Although it is assumed to have a width, it is divided into a region of the presser foot rear portion 22 and a side portion of the presser foot 23 for convenience. Therefore, for example, the front and rear length of the presser foot side portion 23 is made the same as that of the presser foot main body portion 21 so that the rear ends of the presser foot side portion 23 and the presser foot main body portion 21 are aligned, and The portion 22 may be formed from the side edge of the presser foot main body portion 21 on the side opposite to the presser foot side portion 23 to the side edge of the presser foot side portion 23 on the opposite side of the presser foot main body portion 21.

Next, the cloth presser 2 of the above-mentioned cloth presser will be described.
The operation of 0 will be described. In the sewing machine having the above-described cloth presser device, for example, when performing overlock stitching of a thick sewing object having a member easily elastically deformed such as a sponge therein, when the sewing object is pressed by the cloth presser 20,
As described in the conventional example, the part to be sewn by the cloth presser 20 and the vicinity thereof are pressed to be thin, and the other parts have the original thickness.

When the presser foot 20 of the presser foot device is used, as shown in FIG. 4, the presser foot 20 has the same shape as the conventional presser foot.
The rear part 22 of the presser foot is formed at the rear of the sewing machine, and the part of the sewn object at a position where the rear part 22 of the presser foot vertically overlaps the cloth cutting knife 17 farthest from the main body 21 of the presser foot is removed. Since it is formed so as to cover, it is possible to reliably prevent a situation in which the sewing object rises from the work clamp 20 below the cloth cutting knife 17 and the cloth cutting knife 17 comes into contact with the sewing object. be able to. Therefore, it is possible to reliably prevent the cloth cutting knife 17 from coming into contact with the sewing object, thereby reducing the quality and the yield.

When the presser foot 20 of the above presser foot device is used, as shown in FIG.
A presser foot side 23 is formed on the side of the upper thread trimming scissors 18 of the presser foot main body 21 having substantially the same shape as the conventional presser foot, and the presser foot side 23 is attached to the presser foot main body. 21
Is formed so as to entirely cover the portion of the sewing object which is vertically overlapped with the upper thread cutting scissors 18 protruding to the side of the upper thread cutting scissors 18.
It is possible to reliably prevent a situation in which the sewing object rises from the cloth presser 20 and the upper thread cutting scissors 18 come into contact with the sewing object. Then, it is possible to prevent the upper thread cutting scissors 18 from coming into contact with the sewing object, thereby preventing the movement of the sewing object, thereby making it possible to smoothly move the sewing object. Therefore, in sewing using the above-described sewing machine, workability and quality can be improved.

Next, a second example of the embodiment of the present invention will be described. The sewing machine presser device of the second example has a configuration similar to that of the sewing machine presser device of the first example, except for the portions described below. Is omitted. The second example differs from the first example of the presser foot device of the sewing machine in the shape of the presser foot 40 of the presser device, and the differences from the first example will be described below.

In the sewing machine presser foot device of the second example,
The presser foot 40 includes a presser foot main body 21 and a presser foot rear portion 42.
(Shown in FIG. 6) and a presser foot side portion 43 (shown in FIG. 7). Then, the presser foot main body 21
Is similar to the first example. As shown in FIG. 6, the presser foot rear portion 42 is formed to extend rearward from the rear end of the presser foot main body 21, and
It is formed diagonally so that it becomes higher as it moves away from it.
Therefore, the rear end of the presser foot rear portion 42 is
It is higher than 1. And the back part 42 of the presser foot is
Except that it is formed obliquely as described above, it has the same configuration as the pressure foot rear portion 22 of the first example.

Also, as shown in FIG.
3 is formed so as to extend laterally from the side edge of the presser foot main body portion 21 and is formed diagonally so as to be higher as the presser foot main body portion 21 is further away. Therefore, the side edge of the side portion 43 of the presser foot opposite to the presser foot main body portion 21 is higher than the presser foot main body portion 21. The presser foot side portion 43 has the same configuration as the presser foot presser side portion 23 of the first example except that it is formed obliquely as described above.

In the sewing machine presser device of the second embodiment having such a presser foot 40, the same operation and effect as those of the first embodiment can be obtained. In addition, when the material to be sewn having elasticity is pressed by the cloth presser 40 and the material to be sewn is elastically deformed, the elastic force (reaction force) received by the cloth presser 40 from the material to be sewn can be reduced. That is, in the second example, the presser foot rear portion 42 and the presser foot side portion 43 of the presser foot 40 are inclined as described above, so that when the sewing object is pressed downward, In the rear portion 42 and the side portion of the presser foot side portion 43 opposite to the presser foot main body portion 21, the amount of elastic deformation of the work to be sewn thereunder is reduced, and the elastic force received from the work to be sewn is reduced. can do.

In other words, in the presser foot 20 of the first example, the area is larger than that of the conventional presser foot by adding the rear part 22 of the presser foot and the side part 23 of the presser foot to the main body 21 of the presser foot. In the case where the same pressing force is applied per unit area of the sewing object, a larger pressure is required as a whole. On the other hand, according to the presser foot 40 of the second example, the presser foot main body portion 21 which needs to actually press the workpiece is located at the lowest position, and the other presser foot rear portions 42
The main part of the side portion 43 of the cloth presser is
Since it is located at a higher position, a large elastic force is not applied to the rear portion 42 and the side portion 43 of the presser foot, and the sewing object can be pressed with a smaller pressing force as a whole than in the first example.

Next, a third example of the embodiment of the present invention will be described. The presser foot device of the sewing machine of the third example has the same configuration as the presser foot device of the first example except for the parts described below. Description is omitted. The third example differs from the first example of the presser foot device of the sewing machine in the shape of the presser foot 50 of the presser device. Differences from the first example will be described below. In the presser foot device of the third example of the sewing machine, the presser foot 50 includes a presser foot main body 21, a presser foot rear portion 52 (shown in FIG. 8), and a presser foot side portion 53 (shown in FIG. 9). It is provided with.

The main body 21 of the presser foot is the same as that of the first embodiment. As shown in FIG. 8, the presser foot rear portion 52 has a shorter front-back length than the presser foot rear portion 22 of the first example. That is, as shown in FIG. 4, the cloth presser rear part 22 of the first example has a front-rear length that is the furthest from the rear end of the presser foot main body part 21 in the state farthest from the presser foot main body part 21. In contrast to the rear end of the scalpel 17, which is formed so as to entirely cover the portion of the sewing material at a position vertically overlapping the cloth cutting scalpel 17 farthest from the cloth presser main body 21, As shown in FIG. 8, in the presser foot rear portion 52 of the third example, the front-rear length is the farthest length from the rear end of the presser foot main body 21 as described later. Cloth knife 17
Up to the position before the rear end. Therefore, the presser foot rear portion 52 of the third example is not formed so as to entirely cover the portion of the sewing object that is vertically overlapped with the cloth cutting knife 17 farthest from the presser foot main body 21. In this state, a part of the part to be sewn which vertically overlaps the cloth cutting knife 17 is exposed without being covered by the cloth presser rear portion 52.

In this case, the cloth cutting knife 17 for the sewing object is used.
As shown by the imaginary line in FIG. 8, the portion of the portion that overlaps with the upper and lower portions and is not covered by the presser foot rear portion 52 is in a raised state and approaches the cloth cutting knife 17. In the vicinity of the portion 52, the material to be sewn rises higher as it moves away from the rear portion 52 of the presser foot, and the thickness of the material to be sewn at a certain distance from the material to be sewn.

That is, when the cloth cutting knife 17 is disposed above the sewing object in the vicinity of the cloth presser rear portion 52, the sewing object does not rise to the original thickness, and the cloth cutting knife 17 is It may be in a state of non-contact. Therefore, it is not necessary to cover the cloth presser rear portion 52 entirely at a position vertically overlapping the cloth cutting knife 17 of the workpiece to be furthest away from the cloth presser main body 21. The rear end of the portion 52 may be in front of the rear end of the cloth cutting knife 17 located farthest from the presser foot main body 21.

In other words, the cloth presser rear portion 52 is in a state where the cloth presser 50 presses a thick sewing object having elasticity, and when the cloth presser 50 advances, the cloth cutting knife 17 moves the cloth presser main body. When relatively moved rearward with respect to the portion 21, on the rear side of the presser foot 50, the sewn material in a state of being raised above the presser foot 50 without being pressed by the presser foot 50 is placed. In order to reach the height of the cloth cutting knife 17 at the ascending position and not to contact the cloth cutting knife 17, the cloth presser rear portion 52 is attached to the cloth presser main body 21.
It is only necessary to hold the workpiece behind.

In order to ensure that the cloth cutting knife 17 does not come into contact with the workpiece, the rear end of the cloth presser rear part 52 is positioned in front of the rear end of the cloth cutting knife 17 in the above-described state. , In other words, the presser foot rear portion 52
The minimum length of the front and back of the presser foot main body 21 from the rear end, that is, the position of the rear end of the presser foot rear portion 52 is determined by the thickness of the work to be sewn and It is necessary to determine in consideration of the deformation amount at the time of pressing by 50, the height of the lower end when the cloth cutting knife 17 is raised, the distance from the position where the sewing object is pressed by the cloth presser to the original thickness, and the like. is there.

Further, as shown in FIG.
Reference numeral 3 has a narrower left-right width as compared with the presser foot side portion 23 of the first example. That is, in the cloth presser side portion 23 of the first example, as shown in FIG.
To the rear end to be described later, and is formed so as to entirely cover the portion of the sewn material which is located vertically above the upper thread cutting scissors 18 farthest from the presser foot main body portion 21. In the third example of the presser foot lateral portion 53, the left and right widths are from the side edge of the presser foot main body 21 to a position before the rear end of the upper thread cutting scissors 18, as shown in FIG. Have been. Accordingly, the side portion 53 of the presser foot of the third example is not formed so as to entirely cover the portion of the sewn material located at a position vertically overlapping the upper thread cutting scissors 18, and is not vertically A part of the overlapped sewn part is exposed without being covered by the side portion 53 of the work clamp.

Also in this case, as in the case of the relationship between the cloth cutting knife 17 and the back part 52 of the cloth presser, there is a case where the upper thread cutting scissors 18 do not come into contact with the workpiece.
Therefore, it is not necessary for the presser foot side portion 53 to entirely cover the portion that is vertically overlapped with the upper thread trimming scissors 18, and as described above, the presser presser side portion 53 on the opposite side of the presser foot main body portion 21. The side edge may be fitted before the rear end of the upper thread cutting scissors 18.

In other words, in a state where the cloth presser 50 presses a thick elastic material to be sewn, and at least a part of the upper thread cutting scissors 18 is moved from the area above the cloth presser main body 21 to the lateral side. In the case where the
0, even if the upper thread trimming scissors 18 approach the sewn material that is raised above the presser foot 50 without being pressed by the presser foot 50, So that things do not come in contact with the upper thread cutting scissors 18
It is only necessary that the side section 53 of the presser foot presses the workpiece on the side of the main body section 21 of the presser foot.

The position of the side edge of the side portion 53 of the presser foot is determined by the thickness of the work to be sewn and the presser foot 50 of the work to be sewn in the same manner as the position of the rear end of the rear portion 52 of the presser foot. It is necessary to determine in consideration of the deformation amount at the time of pressing, the height of the lower end portion of the upper thread cutting scissors 18, the distance from the position where the sewing object is pressed by the cloth presser 50 to the original thickness, and the like.

According to the sewing machine presser foot device of the third example, the same effect as that of the first example can be obtained, and the size of the presser foot 50 can be made smaller than that of the first example of the presser foot 20. Therefore, the difference in characteristics such as workability from the conventional art due to the size of the presser foot 20 can be minimized. Further, by making the presser foot 50 smaller than that of the first example, when pressing the workpiece,
0 can be reduced, and the same effect as the configuration according to claim 2 can be obtained. In the third example, as in the second example, the cloth presser rear portion 52 and the cloth presser side portion 53 are inclined as long as the sewing object does not contact the cloth cutting knife 17 and the upper thread cutting scissors 18. It is good.

[0056]

According to the cloth presser of the sewing machine according to the first aspect of the present invention, the cloth presser moves forward while the cloth presser presses a thick elastic workpiece and the cloth presser moves forward. When the cloth cutting knife moves relatively rearward with respect to the body of the presser foot, on the rear side of the presser foot, the cover in a state of being raised above the presser foot without being pressed by the presser foot. The rear part of the presser foot presses the sewn object behind the main body of the presser foot so that the sewn product reaches the height of the cloth cutter at the raised position and does not come into contact with the knife. Further, the cloth cutting knife and the sewing object do not come into contact with each other, and the sewing object is prevented from being damaged by the cloth cutting knife, whereby the quality of the sewing object and the yield can be improved.

According to the presser foot device of the sewing machine according to the second aspect of the present invention, the upper thread trimming scissors are attached to the sewn material which is raised above the presser foot without being pressed by the presser foot. The upper side of the cloth presser presses the material to be sewn on the side of the main body of the presser foot so that the sewn article does not come into contact with the upper thread cutting scissors even when the sewing machine approaches. When the scissors come into contact with the thick and elastic sewing object,
The sewing object can be moved smoothly without obstructing the movement of the sewing object at the time of feeding the cloth, so that the workability of the sewing work and the quality of the sewing object can be improved. it can.

According to the cloth feeding device for a sewing machine according to the third aspect of the present invention, the same excellent effects as those of the second aspect can be obtained, and a sewing machine without a cloth cutting knife or a cloth. The present invention can also be applied to a sewing machine in which the arrangement of the cutting knife has elasticity and does not make contact with a thick workpiece. That is,
The cloth foot of the sewing machine may be provided with a side part of the foot without providing the rear part of the foot.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a sewing machine provided with a cloth presser according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a presser foot of the presser foot device of the first example.

FIG. 3 is a perspective view showing a presser foot of the presser foot device of the first example.

FIG. 4 is a drawing for explaining a relationship between a cloth presser and a cloth cutting knife of the cloth presser of the first example.

FIG. 5 is a drawing for explaining the relationship between the presser foot and the upper thread trimmer of the presser foot device of the first example.

FIG. 6 is a drawing for explaining the relationship between a cloth presser and a cloth cutting knife of the cloth presser of the second example.

FIG. 7 is a drawing for explaining the relationship between the presser foot and the upper thread cutting scissors of the presser foot device of the second example.

FIG. 8 is a drawing for explaining a relationship between a cloth presser and a cloth cutting knife of the cloth presser of the third example.

FIG. 9 is a drawing for explaining the relationship between the presser foot and the upper thread cutting scissors of the presser foot device of the third example.

FIG. 10 is a perspective view of a main part showing a conventional cloth presser.

FIG. 11 is a plan view of a main part showing a conventional upper thread cutting device.

FIG. 12 is a drawing for explaining a relationship between a conventional cloth presser, a cloth cutting knife, and a thick sewing object having elasticity.

FIG. 13 is a drawing for explaining the relationship between a conventional presser foot, upper thread cutting scissors, and a thick elastic sewing object.

[Explanation of symbols]

 Reference Signs List 17 cloth cutting knife 18 needle thread cutting scissors 20 cloth presser 21 cloth presser main body section 22 presser foot rear part 23 cloth presser side section 30 presser arm 31 presser foot 40 cloth presser 42 cloth presser rear section 43 cloth presser side section 50 cloth Presser foot 52 Rear part of the work clamp 53 Side part of the work clamp

Claims (3)

[Claims] 1. A sewing machine provided with a cloth cutting knife that moves up and down behind a needle for performing sewing in a cloth feeding direction, and a presser arm that is swingable in a vertical direction; A presser foot attached to the distal end portion, and a work to be sewn attached to the lower part of the presser foot, and being movable back and forth in the cloth feeding direction with respect to the cloth cutting knife by the operation of the presser arm. A presser foot which presses the presser foot downwards, wherein the presser foot has a front-rear length substantially the same as the front-rear length of the presser foot along the cloth feed direction. A main body portion, and a rear portion of the presser foot formed on the rear side of the presser foot main body portion, wherein the presser feeds forward in a state where the presser foot presses a thick sewing object having elasticity. As a result, the cloth cutting knife When the sewing machine is relatively moved toward the rear side, the material to be sewn above the presser foot without being pressed by the presser foot on the rear side of the presser foot is the cloth cutter in the raised position. A cloth presser for a sewing machine, wherein the rear portion of the presser presses a workpiece behind the main body of the presser so as to reach the height of the scalpel and not contact the cloth cutting knife. 2. The sewing machine according to claim 1, wherein at least a part of the sewing machine is movable to a position protruding from a range above the cloth presser main body on one side of the cloth presser main body. An upper thread trimming scissor provided at least in part is provided, and the pressure foot is provided with a pressure foot side portion formed on the lateral side of the pressure foot body, and the pressure foot has elasticity. In a state in which the thick sewing material is held down, and at least a part of the upper thread cutting scissors protrudes from the range above the presser foot main body to the side, the side of the presser foot is On the side, even when the upper thread trimming scissors approach the sewn material in a state of being raised above the fabric presser without receiving the pressure of the fabric presser, the sewn material contacts the upper thread trimming scissors. Make sure that the side of the presser foot is Presser unit of the sewing machine, characterized in that pressing the workpiece at the side of the body portion. 3. A sewing machine provided with a needle thread cutting scissor, a presser arm capable of swinging up and down, a presser foot attached to a tip portion of the presser arm, and a presser foot attached below the presser foot. And a cloth presser for pressing the workpiece downward by the operation of the presser arm, wherein the cloth presser moves the needle of the sewing machine up and down substantially in the center. A presser foot main body having an elongated hole, and a presser foot lateral portion formed on the side of the presser foot main body; at least a part of the upper thread trimming scissors is provided in the presser foot main body; A state where the cloth presser is capable of moving to a position protruding from a range above the cloth presser main body on one side of the section or is disposed at the above-mentioned position, and the cloth presser presses an elastic thick sewing object. And at least a part of the upper thread cutting scissors Is in the state of protruding to the side from the range above the body of the presser foot, in the state of being raised above the presser without receiving the pressure of the presser on the side of the presser. Even if the upper thread trimming scissors approach the sewing object, the side portion of the presser foot is covered with the side of the main body of the fabric presser so that the sewing object does not contact the upper thread trimming scissors. A cloth presser for a sewing machine, which holds a sewing product.