JPS623106Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a presser foot device for machine embroidery.

In manual machine embroidery, the fabric is stretched over an embroidery hoop, which is interposed between the embroidery presser foot attached to the lower end of the sewing machine's presser foot and the throat plate, the feed dog is lowered to its inactive position, and the hoop The sewing machine is operated by holding the fabric between the throat plate and the embroidery hoop is moved freely by hand to sew the desired embroidery pattern.

Also, in order for the needle to pierce the fabric and form a complete stitch, the presser foot needs to press the fabric sufficiently, so the spring that presses down the presser foot must be strong enough. There must be. However, if the presser foot is constantly pressing down the fabric with strong force, more force than necessary will be applied when moving the fabric after the needle has risen and pulled out of the fabric. There were problems such as the bulge hindering the smooth movement of the cloth.

To solve this problem, there is a device in which a presser foot holds the cloth only while the needle is piercing the cloth, and when the needle comes out of the cloth, the presser foot also separates from the cloth. However, with this method, the presser foot moves up and down in conjunction with the vertical movement of the needle bar, which causes an eyesore for the worker as the vertical movement of the presser foot enters the field of view around the needle tip, making it difficult to perform efficient embroidery work. It was a hindrance. Moreover, since the needle bar and presser foot are linked,
Since the positional relationship of the needle tip of the first needle to the fabric is unknown when the needle bar is positioned upward, there are inconveniences such as lowering the needle bar each time to lower the needle tip onto the fabric. Ta.

This idea was developed in view of the problems mentioned above with conventional presser foot devices for machine embroidery.During embroidery, the presser foot remains in contact with the fabric at all times, and the needle pierces the fabric to complete the stitch. Until then, apply the desired pressure to the presser foot, and reduce the spring pressure to an appropriate pressure so as not to interfere with the free and smooth movement of the fabric until the needle tip passes through the fabric and enters the next stitching stroke. The object of the present invention is to obtain a presser foot device as described above.

That is, in this invention, the rear end of the operating member is attached to a mounting frame that is detachably fixed to the lower end of the presser bar of the sewing machine.
The rear end of a presser foot for sewing machine embroidery is attached so that it can swing vertically, and between these actuating members and the presser foot, the actuating member is biased upward at one end, and the presser foot is biased downward at the other end. A presser foot spring that presses the presser foot is attached, and a receiving part is provided in the front part of the actuating member to increase the pressing force of the presser foot spring when the needle bar is lowered by a part of the needle bar. To provide a cloth presser device that automatically increases or decreases the pressing force of a cloth presser spring at the upper and lower sides of an operating member that is interlocked with the presser foot.

The details of the presser foot device of this invention will be explained below based on an embodiment shown in the accompanying drawings.

In the figure, reference numeral 1 denotes a sewing machine arm, and to this arm are attached a needle bar 2 which is driven up and down by a known drive mechanism, and a presser bar 3 which is raised or lowered by a known lever operation.

Reference numeral 4 denotes a mounting frame, which is fixed using a presser foot mounting screw 5 after removing a normal presser foot from the lower end of the presser bar 3.

Reference numeral 6 denotes a presser foot, the rear end of which is swingably attached to the lower end of the mounting frame 4 via a horizontal shaft 7. This presser foot 6
The front part of the sewing machine is bent downward as shown in FIG. 2, and its lower end is bent leftward as seen from the seamstress to form a presser foot 8 as shown in FIG. Although the cloth presser portion 8 has a rectangular frame shape in the illustrated example, it may have another shape.

Reference numeral 9 denotes an actuating member, the rear end of which is swingably attached to the mounting frame 4 by the horizontal shaft 7. A presser foot spring 10 formed by bending a single spring wire is attached to the operating member 9 and the presser foot 6.

The coiled portion of the presser spring 10 is fitted onto the horizontal shaft 7, and one end 11 of the spring 10 is engaged with the engaging portion 12 of the actuating member 9 to apply an upward rotational force to the member 9. The other end 13 of the spring 10 is engaged with a part of the presser foot 6 to apply a downward rotational force to the presser foot 6.

Further, a receiving portion 15 is provided at the front portion of the operating member 9 to be pressed down by a pressing portion 14 provided on a portion of the needle bar 2 when the needle bar 2 is lowered.

In addition, 16 in the figure is a sewing machine needle fixed to the lower end of the needle bar 2, 17 is a needle plate fixed to the sewing machine bed (not shown), 18 is a needle hole provided in the throat plate 17, 1
9 is a hoop consisting of an inner frame 20 and an outer frame 21; 22 is a cloth stretched over the hoop 19 and sandwiched between the inner frame 20 and the outer frame 21.

The cloth presser device of this invention has the above-mentioned configuration, and in FIGS. 1 and 2, the cloth presser part 8 is inserted into the hoop 19 over which the cloth 22 is stretched, and the cloth 22 is held between the cloth presser part 8 and the throat plate 17. In this state, while operating the sewing machine, the hoop 19 is moved by hand to perform machine embroidery.

During the above sewing, the presser bar 3 is lowered to a certain position by a spring (not shown), and
The cloth presser portion 8 is pressed onto the cloth 22 by the elasticity of a spring 10.

In addition, when the sewing machine needle 16 is raised as shown in FIGS. 1 and 2, one end 11 of the presser foot spring 10
Since the other end 13 is wide open vertically, the force for rotating the presser foot 6 downward is extremely small.

Therefore, the cloth 22 is lightly pressed against the throat plate 17 by the cloth presser 8.
Hoop 1 because it's just being pushed upwards
9 can be moved freely together with the cloth 22.

Next, when the needle bar 2 is lowered and its pressing portion 14 presses down the receiving portion 15 of the actuating member 9 to rotate the member 9 downward as shown by the chain line in FIG. 2, one end 11 of the presser foot spring 10 is As the other end 13 approaches, the elasticity becomes significantly large, so that the cloth presser foot 8 presses the cloth 22 onto the throat plate 17.
Press firmly to fix it, and in this state, insert sewing machine needle 1.
6 pierces the cloth 22.

In this way, when the needle 16 pierces the cloth 22, a stitch is created, and the needle 16 passes through the cloth 22 and rises, the pressing part 14 also releases the pressing force of the arm 15, making it easier to move the cloth 22.

The presser foot device of this invention has the presser foot 6 as described above.
In addition, an actuating member 9 is provided, one end 11 and the other end 13 of a presser foot spring 10 for pressing down the presser foot 6 are hung between the actuating member 9 and the presser foot 6, and a presser foot 1 provided on the needle bar 2 is connected.
By pressing down the receiving part 15 of the actuating member 9 with 4, the cloth presser part 8 of the cloth presser foot 6 firmly presses the cloth 22 and fixes it so that it does not move when forming a seam, so that a good seam can be obtained. When the needle bar 2 is raised, the presser foot 8
Since the pressing force on the cloth 22 is reduced, the cloth 22 becomes extremely easy to move, and the cloth presser portion 8 can easily overcome the bulge in the seam caused by the sewing thread. Furthermore, since the cloth presser foot 8 is always in contact with the cloth 22, it is easy to confirm the lowered position of the sewing machine needle 16.

Incidentally, a scale may be provided on the presser foot 8 to help confirm the lowering position of the needle 16 and the swing width of the needle.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal front view showing an embodiment of the presser foot device of this invention, Fig. 2 is a partially longitudinal side view of the same, Fig. 3 is a longitudinal plan view of the same, and Fig. 4 is a main part of the presser foot. It is an exploded perspective view. 3... Presser bar, 4... Mounting frame, 6... Fabric presser foot,
9... Operating member, 10... Presser foot spring, 11...
One end, 13...Other end, 14...Pushing part, 15...
Ukebe.

Claims (1)

[Scope of utility model registration request] The rear end of the actuating member and the rear end of the presser foot for sewing machine embroidery are each attached to a mounting frame removably fixed to the lower end of the presser foot of the sewing machine so that they can swing vertically, and these actuating members and the presser foot are attached to the mounting frame. A presser foot spring is installed in between, which urges the actuating member upward at one end and downwardly at the other end, and at the front of the actuating member, when the needle bar is lowered, A presser foot device for sewing machine embroidery is provided with a receiving part that increases the pressing force of a presser foot spring when pressed down by the presser foot.