JPH05193A - Button sewing machine - Google Patents

Abstract

PURPOSE:To perform proper sewing by preventing sewing thread from being drawn out of a cloth piece in sewing a shank button. CONSTITUTION:Against a button sewing machine, a stitch forming course for a sewing thread piece S is provided with a resistance object A for applying resistance to the sewing thread piece S not to be easily moved. Otherwise, while a sewing needle N is driven from the bottom dead center of a first stitch to the position of the bottom dead center of a second stitch, a holding means for holding the sewing thread piece S on the upper surface of a cloth piece W is set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a button sewing machine, and more particularly to a button sewing machine which prevents defective sewing threads from being removed during sewing and performs proper button sewing.

[0002]

2. Description of the Related Art As a sewing machine for sewing a shank button B having a sewing protrusion Ba on its back like the gold button shown in FIG. 5, a button sewing machine shown in FIG. 6 has been proposed today. In the figure, M is a sewing machine forming a single-thread chain stitch.

Reference numeral 1 is a support body for supporting the cloth by folding it in two, which is provided on an arm 1a connected to a rotating shaft 4 and is rotatable as shown by an arrow, and is fixed to a sewing machine M. By means of the cloth guide plate 3, the cloth can be folded in two below the sewing needle N.

Reference numeral 2 denotes a button holding means. The button holding means 2 can hold the shank button B vertically below the sewing needle N by sandwiching both ends of the shank button B as shown in the figure.

FIG. 7 is a view showing a sewing state of the cloth W and the button B. The cloth W is folded in two by the support 1 and the cloth guide plate 3, and the shank button B is held in the vicinity of the cloth W in the folded portion. Has been done. (The holding means 2 is omitted in the drawing.) The support 1 and the cloth guide plate 3 have through holes at the needle drop points of the sewing needle N.

In the above state, the sewing needle N of the single thread chain stitch sewing machine M is alternately moved up and down between the tip of the cloth W and the sewing portion Ba of the shank button B to sew them together as shown in FIG. Then, this can be taken out of the button sewing machine and the folds of the cloth W can be widened.

[0007]

However, the above-mentioned conventional button sewing machine has the following problems.
As shown in FIG. 9, the sewing needle N of the single thread chain stitch sewing machine is the cloth W.
On the other hand, when the first stitch is moved up and down, a tip portion Sa of the sewing thread S is left on the upper surface of the cloth W for a predetermined length, and a loop is formed by the sewing thread S below the cloth W. However, when the resistance of the cloth W to the sewing thread S is small, such as when the cloth W is thin, the sewing thread S is caught by the looper 5 or the sewing needle N is driven upward to drive the sewing thread S. There is a problem in that a seam where the tip portion Sa is pulled out from the fabric W is not formed.

In order to solve the above-mentioned problem, a method may be adopted in which the tip end portion Sa of the sewing thread S is left on the upper surface of the fabric W for a required length or more and sewn. In this case, as shown in FIG. After sewing, the tip portion Sa of the sewing thread S
Will significantly reduce the quality of the sewn product, so it is unavoidable to cut off the tip Sa with scissors,
This has reduced the efficiency of sewing work.

[0009]

A button sewing machine according to the present invention has been made to solve the above-mentioned conventional problems, and prevents the sewing thread from easily moving in the stitch forming path of the sewing thread. A resistance means for providing resistance is provided or a pressing means for pressing the sewing thread on the upper surface of the fabric is provided while the sewing needle for the fabric is driven from the bottom dead center position of the first stitch to the bottom dead center position of the second stitch, The present invention is intended to solve the above conventional problems.

[0010]

The button sewing machine according to the present invention prevents the leading end of the sewing thread from being pulled out from the cloth by means of the resistor provided in the stitch forming path of the sewing thread or the pressing means for holding the sewing thread on the upper surface of the cloth. The formation of a button seam.

[0011]

Embodiments of the present invention will be described with reference to the drawings. The same parts as those of the conventional example are designated by the same reference numerals, and the duplicated description will be omitted. 1A to 3A are views showing an embodiment of a resistor provided in a stitch forming path of a sewing thread S. FIG.

The resistor A shown in FIG. 1 is detachably provided at the needle drop point of the support 1 which supports the fabric W in two folds.
The resistor A shown in FIG.
Detachable at the needle drop point.

FIG. 3 is an external perspective view showing the resistor A.
The resistor A is formed of a rubber material having a large contact resistance, and has a slit portion A1 as shown in the figure. This resistor A
The slit A1 is formed smaller than the thickness width of the sewing thread S, and the sewing thread S can be given a resistance by passing the sewing thread S through the slit A1.

The thickness of the sewing thread S is changed or the resistance A is used.
When wear occurs, the resistor may be removed and replaced with a proper resistor.

Next, an embodiment of a button sewing machine according to claim 2 of the present invention will be described. In FIG. 4, C is a pressing means, and the pressing means C is composed of an air cylinder 6 and an abutting body 7 made of a rubber material provided on the advancing / retracting portion 6a of the air cylinder 6.

The pressing means C is connected to an angle detecting means (not shown) provided on a main shaft for driving the single thread chain stitch sewing machine M, and the sewing needle N is located at the bottom dead center position of the first stitch. After the needle N has risen and the sewing needle N has come out of the cloth W, the contact body 7 is advanced as shown in the figure.

When the abutting body 7 advances, the abutting body 7 presses the sewing thread S located on the upper surface of the cloth W against the cloth W or the shank button B so that the necessary quantity of thread is fed out from the thread supply side. The needle thread tip can be stopped so that it will not be pulled out of the cloth.

[0018]

As described above, the button sewing machine according to the present invention is provided with a resistor for giving resistance to the sewing thread in the stitch forming path of the sewing thread, or the sewing needle to the cloth is the first.
Since the sewing machine is equipped with a pressing means that holds the sewing thread on the upper surface of the fabric after the needle has risen from the bottom dead center and the sewing needle has pulled out of the fabric, it is possible to prevent the sewing thread from pulling out of the fabric. It becomes possible to sew various shank buttons. Also, since the tip of the sewing thread protruding on the upper surface of the fabric can be made short so as not to affect the quality, the work of cutting off the tip can be eliminated and the sewing work efficiency can be improved. Become.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a sewing portion of a button sewing machine including a resistor at a needle drop point of a support plate.

FIG. 2 is a cross-sectional view showing a sewing portion of a button sewing machine including a resistor at a needle drop point of a cloth guide plate.

FIG. 3 is an external perspective view showing a resistor.

FIG. 4 is an explanatory view showing a sewn portion of a button sewing machine including a pressing means.

FIG. 5 is a side view showing a shank button.

FIG. 6 is an external perspective view showing a configuration state of a conventional button sewing machine.

7 is an explanatory view showing a sewing state in the button sewing machine shown in FIG.

FIG. 8 is an explanatory diagram showing a sewing state of buttons and cloth sewn by the button sewing machine shown in FIG.

FIG. 9 is an explanatory diagram showing a pulled-out state of the leading end portion of the sewing thread when the resistance between the cloth and the sewing thread is small.

FIG. 10 is a side view showing a sewn-up state in which the tip of the sewing thread is projected more than necessary on the upper surface of the fabric.

[Explanation of symbols]

1 support 2 button holding means A resistor B shank button C pressing means N sewing needle W cloth S sewing thread

Claims (2)

[Claims] 1. A back surface is sewn with a support body for supporting a folded fabric under a sewing needle, and a button holding means for holding a button in a vertical state below the sewing needle so as to face the fabric. In a button sewing machine for sewing a shank button having a protruding portion, a stitch forming path of a sewing thread,
A button sewing machine characterized in that a resistance material is provided to provide resistance so that the sewing thread does not move easily. 2. A back surface is sewn with a support body for supporting the folded fabric under the sewing needle, and a button holding means for holding the button in a vertical state so as to face the fabric under the sewing needle. In a button sewing machine for sewing a shank button having a protruding portion, a sewing thread on the upper surface of the cloth is sewn while the sewing needle to the fabric is driven from the bottom dead center position of the first stitch to the bottom dead center position of the second stitch. A button sewing machine characterized in that it is provided with a pressing means for stopping the presser foot.