JPH0211274B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present 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 fabric presser frame is The sewing machine is operated by holding the fabric between the embroidery hoop and the needle plate, and the embroidery hoop is freely moved by hand to sew the desired embroidery pattern.

Therefore, the presser foot must first be positioned inside the hoop where the fabric is stretched, and when sewing embroidery, there are many hoops that can be used to prevent thread breaks, clogged stitches, repositioning the fabric relative to the hoop, or when embroidery is complete. Attaching and detaching work is required. For this reason, the hoop needs to go under the presser foot several times, but in order to make the hoop go under, the presser foot attached to the lower end of the presser foot is raised, and the hoop is placed between the presser foot and the throat plate. It is necessary to secure a space for the people to pass through.

In the conventional embroidery presser foot, the rear end of the presser foot is swingably attached to a mounting frame fixed to the presser foot, and a spring is attached to press the cloth by urging the presser foot downward. However, when using this kind of presser foot, the presser foot is constantly pushed downward by the spring, so when you pull up the presser foot,
The presser foot rotates further downward due to the spring, and there is not enough space between the presser foot and the needle bar, especially when the presser foot has a large downward rotation angle to increase the pressing force. Even when the rod is pulled up, the presser foot remains in contact with the fabric, which is extremely inconvenient as the presser foot must be raised with one hand each time the hoop is attached or removed, as described above, and this reduces embroidery work efficiency. cause it to happen.

This invention has been developed in view of the above-mentioned problems with conventional sewing machine embroidery presser feet.When the presser foot is pulled up, the presser foot automatically rotates upward in conjunction with the presser rod, and at the same time, the presser foot is attached. The object of the present invention is to provide a fabric presser foot device that can provide a significantly wider space between the fabric presser foot and the throat plate than conventional ones, since the mounting frame also moves upward.

In other words, this device attaches to the rear end of a sewing machine embroidery presser foot in a mounting frame that is removably fixed to the lower end of the presser foot of the sewing machine, and that the presser foot is biased downward to attach to the throat plate. A spring is provided at the top of the mounting frame for crimping the upper fabric, and when the presser foot bar is raised, the fabric presser foot is rotated upward against the spring to close the gap between the fabric presser foot and the throat plate. A sewing machine that is equipped with an operating member that works in conjunction with the presser foot so that when the presser foot is lowered, the presser foot is rotated downward by a spring and presses the fabric on the throat plate. A presser foot device for embroidery is provided.

The details of the present invention will be explained below based on an embodiment shown in the accompanying drawings.

In the figure, 1 is an arm that is the main body of the sewing machine, 2 is attached to this arm 1 so that it can be raised and lowered,
a needle bar driven up and down by a known drive device;
3 is a presser bar, which is raised or lowered by a known mechanism.

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 cloth presser whose rear end is swingably attached to the lower end of the mounting frame 4 via a horizontal shaft 7. The front part of this presser foot 6 is bent downward as shown in FIG. 2, and the lower end thereof is bent to the left when viewed from the seamstress as shown in FIG. 1, forming the presser foot part 8. In the illustrated case, the presser foot 8 is bent into an inverted trapezoid when viewed from the front, and an indicator 9 indicating the position of the needle is provided at the center of the upper surface, but this shape is free.

Reference numeral 10 in FIGS. 2 and 3 is a spring that urges the presser foot 6 downward. Its tip 11 is engaged with the upper part of the presser foot 6, and its rear end 12 is attached to a screw on the rear side of the mounting frame 4. It is supported by an adjustment screw 13 screwed into the hole, and the elasticity of the spring 10 is adjusted by moving the screw 13 back and forth.

Reference numeral 14 denotes an operating member, whose rear end is rotatably attached to the upper part of the mounting frame 4 via a horizontal shaft 15. A downward projecting piece 16 is provided at the rear end of the working member 14, and this projecting piece 16 is brought into contact with the upper end front portion of the upward projecting piece 17 at the rear end of the presser foot 6.

Reference numeral 18 in FIGS. 1 and 2 is a stopper fixed to the lower part of the arm 1, and is located at a position where it comes into contact with the upper side of the tip of the operating member 14 when the presser bar 3 is pulled up.

In addition, 19 in the figure is a sewing machine needle fixed to the lower end of the needle bar 2, 20 is a throat plate fixed to a sewing machine bed (not shown), 21 is a needle hole provided in the throat plate 20, 2
2 is a hoop consisting of an inner frame 23 and an outer frame 24, and 25 is a cloth with the hoop 22 stretched between the inner frame 23 and the outer frame 24.

The cloth presser device of the present invention has the above-mentioned configuration, and in FIGS. 1 and 2, the cloth presser part 8 is inserted into the hoop 22 in which the cloth 25 is stretched, and the cloth presser part 8 and the throat plate 20 are used to hold the cloth 25. Hoop 2 by hand while running the sewing machine
Move 2 to perform machine embroidery.

During the above-mentioned sewing, the presser foot 3 is pressed down by a spring (not shown), and the operating member 14 faces upward, so that the protruding piece 16 faces obliquely forward, and therefore the presser foot 6 is pushed down by the protruding piece 17 as well. It faces diagonally forward.

Now, when the operation of the sewing machine is stopped and the presser bar 3 is pulled up against the spring (not shown) by operating a lever (not shown), the tip of the operating member 14 that rises together with the presser bar 3 hits the stopper 18. is the mounting frame 4
As it continues to rise, the operating member 14 becomes almost horizontal as shown by the chain line in FIG. 2, and the protruding piece 16 at the rear end pushes the protruding piece 17 of the presser foot 6 rearward.

As mentioned above, the protruding piece 16 of the action member 14
The presser foot 6, which has been pushed backward by the presser foot 7, rotates significantly upward about the shaft 7 as shown by the chain line in FIG. Since the presser bar 3 is fixed in the raised position by a known lever mechanism, the presser bar 3 and the presser foot 6 remain raised.

Therefore, a large space is created under the presser foot 6, allowing the hoop 22 to freely pass through.

Next, when the presser bar 3 that has been pulled up as described above is lowered by operating the lever, the stopper 18
The pressure on the operating member 14 is released, and the presser foot 6 is rotated downward by the action of the spring 10, and the protrusion 17 at the rear end pushes the protrusion 16 of the operating member 14 forward, returning to the state shown in FIG. 2.

In this invention, as described above, the embroidery presser foot 6 is designed to swing up and down in conjunction with the vertical movement of the presser foot bar 3, and when the presser foot bar 3 is lowered, the cloth presser foot 8 moves as before. When the cloth 25 is pressed down and embroidery sewing is possible, when the presser foot 3 is raised, the presser foot 6 automatically rotates upwards, so after pulling up the presser foot as in the conventional method, and then lifting the presser foot again. It is extremely convenient because there is no need to pass through a hoop, and the presser foot 6 automatically rotates downward when the presser foot bar 3 is lowered. Another advantage is that large attached devices such as embroidery machines can be used.

In the illustrated embodiment, the operating member 14 is lever-shaped and rotates the presser foot upward by its swinging motion. The action member 1 is moved so as to raise the presser bar 3 by a greater amount than the lifting amount of the presser bar 3.
Of course, any mechanism other than the illustrated example may be used as long as the mechanism 4 works.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal front view showing an embodiment of the present invention, FIG. 2 is a partially longitudinal side view of the same, and FIG. 3 is a partially transverse plan view. 3... Presser bar, 4... Mounting frame, 6... Fabric presser foot for sewing machine embroidery, 7... Horizontal shaft, 10... Spring, 14... Working member.

Claims (1)

[Scope of Claims] 1. The rear end of a sewing machine embroidery presser foot is swingably attached to a mounting frame detachably fixed to the lower end of a presser foot bar of a sewing machine, and the presser foot is directed downward. A spring is provided at the top of the mounting frame, and when the presser bar is raised, the presser foot is rotated upward against the spring, and when the presser bar is lowered, the presser foot is rotated upwardly against the spring. A presser foot device for machine embroidery, which is equipped with an operating member that interlocks with the presser foot so that the presser foot is rotated downward by a spring. 2. The rear end of the working member is swingably attached to the upper part of the mounting frame by means of a horizontal shaft, and means for rotating the working member downward when the presser bar is raised, and means for rotating the working member downward when the pressing bar is raised, and A presser foot device for machine embroidery according to claim 1, further comprising means for interlocking the operating member and the presser foot so as to rotate the presser foot upward. 3. An upward protruding piece is provided at the rear end of the presser foot, a downward protruding piece is provided at the rear end of the working member, and the downward protruding piece is brought into contact with the front side of the upper end of the upward protruding piece, and the presser foot is attached to the sewing machine body. The sewing machine embroidery cloth according to claim 2, further comprising a stopper that contacts the upper front end of the working member that rises together with the rod and rotates the working member downward with respect to the mounting frame. Presser foot device.