JP2592469Y2 - Presser foot device for pleat stitching in overlock sewing machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pleat presser device for an overlock sewing machine. It concerns the device.

[0002]

2. Description of the Related Art FIG. 3 shows a sewn portion of a pleat stitch which forms a sew while forming a fold (frill) on a fabric. In FIG. 3, 1 is a first cloth feed dog and 2 is a second cloth feed dog.

As is well known, the cloth feed teeth of the sewing machine make four movements so as to protrude from the through holes 4a of the needle plate 4, and feed the cloth W placed on the upper surface of the needle plate 4, and are folded. In the sewing, the cloth feed amount of the first cloth feed dog 1 located in the front in the feed direction (indicated by an arrow) of the cloth W is increased, and the cloth feed amount of the second cloth feed tooth 2 positioned in the rear is reduced. Has become.

As described above, the cloth W fed by the two feed dogs having a difference in the cloth feed amount has a fold A formed by the difference in the feed amount, and the formed fold A is formed on the bottom surface of the presser foot 3. It reaches the formed fold receiving groove 5.

In the state where the fold A is formed, the sewing needle N forms a predetermined stitch, and the fold A can be left on the cloth W.

[0006] Incidentally, the cloth W to be sewn in the pleat sewing generally comprises two cloths, an upper cloth W1 and a lower cloth W2.

[0007] When pleating is performed with two cloths W1 and W2, the upper cloth W1 is kept flat, a fold A is formed on the lower cloth W2, and both cloths are sewn together.

In order to perform such sewing, it is necessary to make the feed amount constant in the upper cloth W1, and today, as shown in FIGS. 4 and 5, between the first feed dog 1 and the presser foot 3 A method is adopted in which a blocking plate is provided so that the drive of the first feed dog 1 is not transmitted to the upper cloth W1, and the upper cloth W1 is fed only by the second feed dog 2.

FIGS. 4 and 5 each show (a) a side view of a pleat stitch presser device, and (b) a front view of a pleat stitch presser device.

The blocking plate shown in FIG. 4 is fixed to the upper surface of the presser foot 3 at the upper side, has a U-shaped cross section, and is formed by a leaf spring 6 located at a predetermined distance from the lower side of the presser foot 3.

The blocking plate shown in FIG. 5 has one end fixed to the sewing machine frame 8 and a leading end formed by a fixing plate 7 located at a predetermined distance from the first feed dog 1.

[0012]

However, the above-mentioned conventional presser foot device for pleat sewing has the following problems.
When the upper cloth W1 has a thin shape, that is, when the distance between the presser foot 3 and the blocking plate 6 is thinner, the blocking plate 6 formed of a leaf spring shown in FIG. The sewing product quality was unstable because of swinging during sewing because it did not result in a sewn state.

9 If the upper cloth W1 is thick, that is, if the upper cloth W1 is thicker than the gap between the presser foot 3 and the blocking plate, the upper cloth W1 is strongly pressed by the blocking plate regardless of the pressing pressure of the presser foot 3. As a result, there is a problem that the paper is not fed by an appropriate feed amount.

Further, since the sewing position of the cloth W is limited by the folded portion 6a of the blocking plate 6, the cutting width of the cloth W by the cutting means 7 (see FIG. 2) installed near the presser foot 3 is increased. There was an inconvenience that I could not do it.

On the other hand, in the case of the blocking plate composed of the fixing plate 7 shown in FIG. 5, the inconvenience described above occurs due to the thickness of the lower cloth W2, and the cost is increased due to the complicated structure.

[0016]

A presser foot device for pleat sewing according to the present invention has been made to solve the above-mentioned conventional problems, and has a first structure for feeding a cloth to be sewn along a sewing direction.
A feed dog (1), a second feed dog (2) having a smaller amount of cloth feed than the first feed dog, a cutting means (7) for cutting the end of the cloth, the first feed dog and a presser foot ( And 3) separating an upper cloth and a lower cloth between the first feed dog and the second feed dog. In a pleat presser device for an overlock sewing machine which performs sewing while cutting a cloth end, the blocking plate (C) is provided with a separating portion (Cb) for separating an upper cloth and a lower cloth from each other in a horizontal direction. A regulating part (Cc) for regulating the movement, and a central part (Ca) connecting the separating part and the regulating part with the presser foot therebetween.
And a support member (P) for vertically supporting the regulating portion of the blocking plate is provided on the presser foot, and a central portion of the blocking plate is positioned rearward in the sewing direction from a female portion of the cutting means. It is characterized by being located.

[0017]

According to the present invention, a presser foot device for pleat sewing in an overlock sewing machine comprises a first feed dog and a presser foot (3).
And a blocking plate (C) for separating the upper cloth and the lower cloth between the upper cloth and the lower cloth. Therefore, if the sum of the thicknesses of the upper cloth and the lower cloth is almost constant, the blocking plate automatically moves up and down according to the thickness of the upper cloth and the lower cloth, and a predetermined amount is applied to the upper cloth and the lower cloth. , A proper feeding amount can be obtained, and the cloth can be reliably cut, so that a high quality sewing product can be obtained. The blocking plate (C) includes a separating part (Cb) for separating the upper cloth and the lower cloth, a restricting part (Cc) for restricting a horizontal movement, and a restricting part (Cc) interposed therebetween with the presser foot therebetween. And a central part (Ca) connecting the parts. A support member (P) for vertically supporting the regulating portion of the blocking plate is provided on the presser foot, and the center of the blocking plate is positioned rearward in the sewing direction from the female portion of the cutting means. . For this reason, since the sewing position and the cutting position of the fabric are not limited to the central portion of the blocking plate, the worker can freely move the fabric in the horizontal direction and freely set the cutting width of the fabric. Can be sewn at the position.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The same parts as in the conventional example are denoted by the same reference numerals, and redundant description will be omitted. FIG. 1 and FIG. 2 are views showing an embodiment of a holding device for pleat sewing according to the present invention.

In FIG. 1, P is a pin as a support projecting vertically from the upper surface of the presser foot 3, and an E-ring (Pa) as a retaining member can be attached to the upper end thereof. In this embodiment, two supports P are provided.

C is a blocking plate having a U-shaped cross section.
The lower side of the blocking plate C is a separating section (Cb) for separating the upper cloth and the lower cloth between the first feed dog 1 and the presser foot 3, and the upper side thereof is a restricting section (R) for restricting horizontal movement. Cc).
A central portion (Ca) connecting the separating portion and the regulating portion is formed with the presser foot 3 interposed therebetween. And two holes are formed in the regulating portion of the blocking plate C. The support P engages with this hole to support the blocking plate C so as to be movable in the vertical direction.

Reference numeral Pa denotes an E-ring (stop plate) provided above the pin P so that the blocking plate C does not come off the pin P.

As shown in FIG. 2, the blocking plate C is installed so that a central portion (turning portion) Ca connecting the separating portion and the regulating portion is located behind the female portion 7 of the cutting means.

In the presser foot device for pleat sewing constructed as described above, the blocking plate (C) for separating the upper cloth and the lower cloth between the first feed dog and the presser foot (3) can move up and down. It is supported by. Therefore, if the sum of the thicknesses of the upper cloth and the lower cloth is almost constant, the blocking plate automatically moves up and down according to the thickness of the upper cloth and the lower cloth, and a predetermined amount is applied to the upper cloth and the lower cloth. Pressure force, so
Since an appropriate feed amount can be obtained and the cloth is reliably cut, a high-quality sewing product can be obtained.

Further, the central portion (return portion) C of the blocking plate C
a is positioned behind the knife 7 of the cutting means.
Since the cutting of the cloth W is performed before the cloth W is engaged with the central portion Ca, the sewing position is not limited, that is, the cutting width of the cloth W can be freely set.

[0025]

[Effect of the Invention] The presser foot device for pleat sewing in the overlock sewing machine according to the invention is, as described above,
A blocking plate (C) for separating the upper cloth and the lower cloth between the first feed dog and the presser foot (3) is vertically movably supported. Therefore, if the sum of the thicknesses of the upper cloth and the lower cloth is almost constant, the blocking plate automatically moves up and down according to the thickness of the upper cloth and the lower cloth, and a predetermined amount is applied to the upper cloth and the lower cloth. , A proper feeding amount can be obtained, and the cloth can be reliably cut, so that a high quality sewing product can be obtained. In addition, a support member (P) for vertically supporting the regulating portion of the blocking plate is provided on the presser foot, and a central portion of the blocking plate is positioned rearward in the sewing direction from a female portion of the cutting means. . For this reason, since the sewing position and the cutting position of the fabric are not limited to the central portion of the blocking plate, the worker can freely move the fabric in the horizontal direction and freely set the cutting width of the fabric.
Desired sewing can be performed.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a presser foot device for pleat sewing according to the present invention.

FIG. 2 is a front view showing the presser foot device for pleat sewing shown in FIG. 1;

FIG. 3 is a side view showing a conventional pleat presser foot.

FIG. 4 is an explanatory view showing a conventional pleat sewing presser device provided with a blocking plate made of a leaf spring whose upper part is fixed to a presser foot.

FIG. 5 is an explanatory view showing a conventional pleat sewing presser provided with a blocking plate having one end fixed to a machine frame of the sewing machine.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 first feed dog 2 second feed dog 3 presser foot 7 cutting means A fold P support C blocking plate Ca central part Cb separation part Cc regulating part W1 upper cloth W2 lower cloth

Claims (1)

(57) [Scope of request for utility model registration] 1. A first feed dog (1) for feeding a cloth to be sewn in a sewing direction, and a second feed dog (2) having a smaller cloth feed amount than the first feed dog.
Cutting means (7) for cutting the end of the cloth; and a blocking plate (C) for separating the upper cloth and the lower cloth between the first feed dog and the presser foot (3). The first feed dog and the second
In a crimping presser foot device for an overlock sewing machine which forms a fold on a fabric by a difference in a feed amount from a feed dog and performs sewing while cutting a fabric end, the blocking plate (C) is provided with: A separating part (Cb) for separating the cloth and the lower cloth, a restricting part (Cc) for restricting horizontal movement, a central part (Ca) connecting the separating part and the restricting part with the presser foot therebetween, A support member (P) for vertically supporting the regulating portion of the blocking plate is provided on the presser foot, and a center portion of the blocking plate is positioned rearward in the sewing direction from a female portion of the cutting means. A presser foot device for pleat sewing of an overlock sewing machine.