JP2636556B2 - Button 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 button sewing machine, and more particularly, to a button sewing machine for preventing a thread from slipping out during sewing and performing proper button sewing.

[0002]

2. Description of the Related Art A button sewing machine shown in FIG. 6 has been proposed as a sewing machine for sewing a shank button B having a sewing protruding portion Ba on the back surface like a gold button shown in FIG. In the figure, M is a sewing machine forming a single thread ring stitch.

A support 1 is provided on an arm 1a connected to a rotating shaft 4 so as to be rotatable as indicated by an arrow, and is fixed to a sewing machine M. With the cloth guide plate 3, the cloth can be folded in two under the sewing needle N.

A 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 the 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 near the folded portion of the cloth W. Have been. (The holding means 2 is omitted in the figure.) The support 1 and the cloth guide plate 3 have through holes at the needle drop points of the sewing needles N.

In the above state, the sewing needle N of the single thread and ring sewing machine M is alternately moved up and down to the tip of the cloth W and the sewing portion Ba of the shank button B, and these are sewn together as shown in FIG. Then, this may be taken out from the button sewing machine to widen the fold of the fabric W.

[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
On the other hand, when the first stitch is driven to move up and down, a loop is formed by the sewing thread S below the fabric W, leaving the leading end portion Sa of the sewing thread S on the upper surface of the fabric W by a predetermined length. When the resistance between the cloth W and the sewing thread S is small, for example, when the cloth thickness of the cloth W is thin, the driving of the sewing thread S by the looper 5 or the rising drive of the sewing needle N is performed. There is a problem that a stitch that causes the leading end Sa to be pulled out of the fabric W is not formed.

In order to solve the above-mentioned problem, there is a case where sewing is performed such that the leading end portion Sa of the sewing thread S is left more than a required length from the upper surface of the cloth W. In this case, as shown in FIG. After the sewing is completed, the tip Sa of the sewing thread S
However, since the quality of the sewn product is remarkably deteriorated, it is necessary to cut the tip Sa with scissors or the like.
Sewing work efficiency was reduced.

[0009]

SUMMARY OF THE INVENTION A button sewing machine according to the present invention has been made to solve the above-mentioned conventional problems, and comprises a support for supporting a folded fabric under a sewing needle, and a button. And a button holding means for holding the sewing machine in a vertical state so as to be opposed to the fabric below the sewing needle, wherein the button device for sewing a shank button having a sewing protrusion on the back surface is disposed above the button holding means. Pressing means which can be reciprocated by a driving member between a contact position where the contact body comes into contact with the cloth supported by the support and the shank button held by the button holding means, and a retracted position above the contact position. After the sewing needle rises from the bottom dead center position of the first stitch and falls out of the fabric, the contact body is moved to the contact position until the sewing needle descends to the second stitch, and the sewing thread on the upper surface of the fabric is moved to the fabric. On the top In which it was to stop painting.

[0010]

In the button sewing machine according to the present invention, the leading end of the sewing thread is prevented from being pulled out of the fabric by a resistor provided in a stitch forming path of the sewing thread or a pressing means for holding the sewing thread on the upper surface of the fabric. Button seam formation.

[0011]

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. A shown in FIGS. 1 to 3 is a view showing an embodiment of a resistor provided in a stitch forming path of the sewing thread S.

A resistor A shown in FIG. 1 is detachably provided at a needle drop point of a support 1 for supporting the fabric W in two folds.
Is a cloth guide plate 3 located below the cloth W.
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 A1 as shown in the figure. This resistor A
The slit A1 is formed to be smaller than the width of the sewing thread S, and by passing the sewing thread S through the slit A1, resistance can be given to the sewing thread S.

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

Next, a button sewing machine according to a second embodiment of the present invention will be described. In FIG. 4, C is a pressing means, and the pressing means C is constituted by an air cylinder 6 as a driving member and a contact body 7 formed of a rubber material provided on an advancing / retracting portion 6a of the air cylinder 6. ing.

The pressing means C is connected to an angle detecting means (not shown) provided on a main shaft for driving the single thread ring sewing machine M, so that the sewing needle N is moved from the bottom dead center position of the first stitch. After the sewing needle N is lifted up from the cloth W and penetrated, the contact body 7 is advanced as shown in the figure.

When the abutting member 7 advances, the abutting member 7 pushes the sewing thread S located on the upper surface of the cloth W against the cloth W or the shank button B, thereby feeding out a necessary amount of thread from the thread supply side. To prevent the needle thread tip from pulling out of the fabric.

[0018]

According to the button sewing machine according to the present invention, as described above, a resistance for giving resistance to a sewing thread is provided in a stitch forming path of the sewing thread, or the sewing needle for the cloth is the first sewing needle.
After the sewing needle is lifted from the fabric and rises from the bottom dead center of the stitch, and the sewing needle is pulled out from the fabric, the sewing machine is provided with a pressing means for holding the sewing thread on the upper surface of the fabric. It is possible to sew a proper shank button. In addition, since the leading end of the sewing thread protruding from the upper surface of the fabric can be made short so as not to affect the quality, the cutting operation of the leading end can be eliminated, and the sewing work efficiency can be improved. Become.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a sewing portion of a button sewing machine provided with a resistance 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 provided with a resistance 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 sewing portion of a button sewing machine provided with 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.

FIG. 7 is an explanatory view showing a sewing state of the button sewing machine shown in FIG. 6;

8 is an explanatory diagram showing a sewing state of buttons and fabric sewn by the button sewing machine shown in FIG. 6;

FIG. 9 is an explanatory view showing a state in which the leading end of the sewing thread is pulled out when the resistance between the cloth and the sewing thread is small.

FIG. 10 is a side view showing a finished state of sewing when an unnecessarily large amount of a thread tip is protruded from an upper surface of a fabric.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support body 2 Button holding means A Resistor B Shank button C Pressing means N Sewing needle W Fabric S Sewing thread

Claims (1)

(57) [Claims] 1. A sewing machine comprising: a support for supporting a folded fabric under a sewing needle; and a button holding means for vertically holding a button below the sewing needle so as to face the fabric. In a button device for sewing a shank button having a protruding portion, a driving member disposed above the button holding means abuts an abutment body on the cloth supported on the support and the shank button held on the button holding means. A pressing means is provided which can reciprocate between an abutment position and a retreat position higher than the contact position. The sewing needle rises from the bottom dead center position of the first stitch, falls off the fabric, and then descends to the second stitch. A sewing machine that moves the contact body to a contact position until the sewing thread presses the sewing thread on the upper surface of the cloth on the upper surface of the cloth.