JPS58141178A - Hold-down device for cloth of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a presser foot device for a sewing machine, and particularly to a presser foot device for a sewing machine that uses information stored in a storage element such as a FROM to hold cloth between cloth holders and feed it in any direction. It is.

Conventionally, this type of presser foot device was attached to a sewing machine's presser foot V (a fixed presser foot with a small gap between it and the fabric in order to allow the presser foot device to operate smoothly without resistance. When the needle rises from the lowest position, the friction between the fabric and the needle causes the fabric to rise until it touches surface e of the presser foot.
The size of the loop that is created when the fabric is squeezed when the needle rises is not large enough to be caught by the tip of the sickle, and the loop is twisted and not caught by the tip of the sickle, resulting in skipped stitches, etc. was there.

The present invention has been made in view of the above-mentioned conventional problems, and its object is to provide a presser foot device for a sewing machine that can obtain good stitches without skipping stitches.

In order to achieve the above object, the present invention provides an upper presser foot of an upper presser foot mechanism which is given a vertical feed motion (from the main shaft of the sewing machine), and a lower presser foot mechanism which is interlocked with the feeder of ten stitches from the main shaft of the sewing machine. During the cloth feeding period when the needle is raised, the upper cloth presser and the upper cloth presser release the cloth, and when the needle descends and captures the thread with the tip of the hook, the upper cloth presser foot releases the cloth. It is characterized by being configured so that the cloth is held between the presser foot and the upper cloth presser foot.

Further, the phase timing of the upper cloth presser and the upper cloth presser with respect to the needle can be adjusted individually, and the lower presser foot is configured to be able to move up and down parallel to the up and down movement of the needle.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. The needle bar 10 reciprocates up and down from the sewing machine main shaft 12 via a known needle bar mechanism, and has a d needle 14 at its lower end.
is installed. Further, excessive vertical movement is given to the F sewing machine main shaft 12Fi upper presser mechanism 16 and Fs cloth presser mechanism 18. Next, the configurations of these mechanisms will be explained individually.

F section presser foot mechanism The presser foot 20 is pivoted on the sewing machine frame 22 and reciprocates up and down, and the upper presser foot 24 is connected to the screw 2 at its lower end.
It is installed with 6. The presser foot Ml holder 28 has a protruding shaft 30
and a protruding piece 32, and a screw 3 on the 14r' presser rod 20.
It is fixed at 6. The presser spring 38 is attached to the cloth presser rod 2.
0, its lower end contacts the presser bar holder 28, and the spring specific force is adjusted by an adjusting screw 40 screwed onto the sewing machine frame 22. The upper thread guide 42 is attached to the presser foot holder 28 with a Fi screw 44.

Additional base 4 attached to the sewing machine frame 22 with screws 46
8 inserts the hollow adjustment screw 50 into the hollow adjustment screw, brings the tip of the spring guide rod 52 into contact with the L-shaped fitting 54, and then tightens the stepped screw 56 through the L-shaped fitting. The bell crank 58 is installed using the screw as a pivot point 7. One end of this bell crank is inserted into the protruding shaft 30 of the push-end rod holder 28.

The stepped portion 62 of the stepped shaft 60 screwed onto this protruding shaft prevents it from coming off. At the end of this stepped shaft is a sewing machine frame 2.
A roller 68 is inserted into the long groove 146 of the bell crank guide 66, which is added with a screw 64 to 2. The other end of the bell crank 58 is connected to a link 72 by a stepped screw 7o, and this link is connected to a swinging arm 76 attached to a swinging shaft 74 by a stepped screw 78. The swinging arm 80 at the other end is connected to one end of a rod 84 by a stepped screw 86, and the rod is inserted into an eccentric shaft 82 attached to the main shaft 12. A push spring 88 is fitted on the outside of the spring inner rod 52.

An eccentric wheel 90 is attached to the lower presser mechanism sewing machine main shaft 121C, and the tip of a rod 92 integrated with this eccentric wheel is connected to one arm of a bell crank 98 fixed to one end of a swing shaft 96 with a stepped screw 94. There is. 1. One end of a link 102 is connected to the other arm of the bell crank E with a stepped screw 100, and the other end of this link is connected to an arm 106 with a stepped screw 104. Swing shaft 10 pivotally supported by 22
It is attached to B. The upper presser foot 110 has a hole 112 through which the needle 14 passes, and the hF of the upper presser foot 110 is provided at both ends.
! It has a protruding piece 114 for guiding the movement, and this protruding piece t is fitted into a guide groove 116 provided in the sewing machine frame 22, and the double groove lts*tzo6c formed at the bottom of the protruding piece t is inserted into the guide groove 116 provided in the sewing machine frame 22. Rollers 126 and 126 are attached to the ends of 122 and 124.
128 is not inserted, and the swing arm is connected to the swing shafts 130 and 132.
are installed in each.

It is attached to the sewing machine frame 22 and has a hole 136 into which the protrusion 1121L of the hole 112 of the needle plate t34rj-to presser foot 110 is loosely fitted. Further, the sewing machine main shaft 22 rotationally drives a known hook 138. Upper cloth holder 140 is FR
The cloth is fed in the X-X and Y-Y directions in FIG. 1 by a cloth speeding device (not shown) using a memory element such as an OM, and the cloth is fed by holding the cloth 144 between the upper cloth holder 142. .

In addition, if the upper presser foot 110 is moved up and down parallel to the E movement of the needle 14, the swing shaft 13 is moved as shown in FIG. 2.3.5.
The position 0.132 is installed symmetrically to the vertical movement position of the needle bar lO, and the distance from the center of the swing axis 96 of the bell crank 98 by the stepped screw 1004 and the stepped distance from the center of the swing axis io8 of the arm 106. The distance to the screw 104 is set equal, and the distance from the center of the swing axis 108 of the swing arm 122 to the roller 126 is equal to the distance from the center of the swing axis 96 of the swing arm 124 to the roller 1.
The distances up to 28 are also set equally.

Next, the operation of the presser foot device of the present invention having the above structure will be explained. As shown in FIG. 2, when the needle 14 rises from the lowest point due to the rotation of the sewing machine main shaft 12 and the tip of the hook catches the loop of upper thread, the upper presser foot 24 and the upper presser foot 110 clamp the fabric. During the period in which the needle 14 rises above the cloth 144 and the cloth is fed to the cloth feeding device (not shown), the upper presser foot 24 rises and the upper presser foot 110 moves as shown in FIG. descend.

More specifically, the upper presser mechanism 16 is connected to the swing shaft 7 via a rod 84 and an arm 8° from an eccentric ring 82 attached to the main shaft 12.
4 is given a certain rocking motion, and this interlocking amount is the arm 76,
A swinging motion is transmitted to the bell crank 58 via the link 72 using the service screw 56 as a fulcrum. This bell crank 58
Since one end is inserted into the protruding shaft 3o of the presser zelkova holder 28, the E1 zelkova holder 28 is guided by the rollers 68 of the stepped shaft 60 in the long groove 146 of the bell crank guide 66 and slides up and down. do. Therefore, the presser bar 2 is
0. The upper presser foot 24 can be moved up and down. Press it 88
is always connected to the bell crank guide 6 via the spring guide rod 52.
6 is brought into contact with an L-shaped metal fitting 54 to regulate the position of the bell crank 58.

Upper presser foot 110ij5 spindle 1 of lower presser mechanism 18
The eccentric wheel 90 attached to the bell crank 98 transmits the swinging motion to the six swinging shafts 96 through the knot 92 and the swinging shaft 96 to the swinging shaft 108 via the link 102 and the arm 106. Give the same amount of oscillation. and,
Through the arm 122 attached to the other end of the swing shaft 108 and the arm 124 attached to the other end of the swing shaft 96, the rollers 126 and 128 attached to these light leaks are connected to the two prongs (4118
11120, it is regulated by the protrusion 114 guided by the guide groove 116 of the sewing machine frame 22, and moves up and down parallel to the needle 14.

The timing of the upper presser foot 24 with respect to the vertical movement of the needle 14 is determined by the mounting phase of the eccentric ring 82 with respect to the main shaft 12, and the timing of the upper presser foot 110 with respect to the upper presser foot 24 is determined by the mounting phase of the eccentric ring 90 with respect to the main shaft 12. Determined by phase.

The present invention has the following features: As described in detail, during the feeding period of the cloth 144, the upper cloth presser foot 24 and the upper cloth presser foot 110 do not hold the cloth, and the cloth can be smoothly fed without applying any resistance to the cloth. 14 is lowered and the tip of the hook catches the upper thread loop, the fabric 144 is surely held between the upper fabric presser foot 24 and the upper fabric presser foot 110. Therefore, the needle thread loop can be twisted to make it smaller. Since the stitches can be captured reliably without causing any skipping, good stitches can be obtained with no skipped stitches. Moreover, since the upper presser foot 110Fi can move up and down parallel to the up and down movement of the needle 14, a constant gap can be provided in the hole 112 regardless of the raised position of the needle 14, thereby preventing the loop from changing.

In addition, even when the timing of capturing the needle 14 and hook tip is changed depending on the sewing material, the upper presser foot 24 and the upper presser foot 1
The effect of preventing skipped stitches can be obtained by adjusting the mounting phases of the eccentric wheels 82 and 9o relative to the main shaft 12, respectively.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the device of the present invention, Fig. 2 is a left side view of Fig. 1 showing the state in which the cloth is held between the seven presser foot and the upper cloth presser foot, and Fig. 3 is a left side view of the device of the present invention.
4 is an exploded perspective view of the upper presser mechanism, and FIG. 5 is a cross-sectional right side view taken along line V-V#Ka in FIG. 1. Identical members in each figure are given the same reference numerals, 10F'i needle bar,
12 is the main shaft of the sewing machine, 14 is the needle, 16 is the F section pressing mechanism,
18 is a lower presser foot mechanism, 20 is a presser foot, 22 is a sewing machine frame, 24 is an upper cloth presser, 26 is a screw, 28 is a presser foot holder, 30 is a protruding shaft, 32 is a protruding piece, 36 is a screw, 38 is a Pressing spring, 40Fi adjustment screw, 42 is needle thread guide, 48 is mounting plate, 52 is spring guide rod, 58 is bell crank, 6o
Fi stepped shaft, 62 is the stepped part, 66 is the bell crank guide,
72 is a link, 74 is a swing shaft, 76 and 8o are swing arms, 8
2 is an eccentric ring, 84 is a rod, 86F1 stepped screw, 88 is a push spring, 90 is an eccentric ring, 92 is a rod, 96 is a swing shaft, 98 is a bell crank, 102ij/rest, 106 is an arm, 110 is a Upper presser foot, 112 is a hole, 114 is a protrusion, 11
6 is a guide groove, 118 and 120 are bifurcated grooves, 122 and 12
4 is a swing arm, 130 and 132 are swing shafts, 134 is a throat plate,
136 is a hole, 13g is a hook, 140 is a lower cloth holder, 14
2 is an upper cloth holder, and 144 is a cloth. Agent Patent attorney Shin Kuzuno - (1 other person) Figure 2 #3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] (1) An upper presser foot of an upper presser mechanism to which a vertical feed motion is applied from the main shaft of the sewing machine, and an upper presser foot of a lower presser mechanism to which a vertical feed movement is applied to the main shaft of the sewing machine, During the period when the fabric speed increases, the upper fabric presser foot and the upper fabric presser foot release the fabric, and when the needle descends and captures the thread with the tip of the hook, the upper fabric presser foot and the upper fabric presser foot release the fabric. A presser foot device for a sewing machine, characterized in that it is configured to clamp the presser foot. (2. The device according to claim (1), in which the phase timing of the upper cloth presser relative to the needle and the upper cloth presser relative to the needle can be individually adjusted. (3) Claim (1) In the device of the above, a fabric presser foot for a sewing machine has an upper fabric presser that is movable up and down parallel to the vertical movement of the needle.