JPH0956944A - Presser for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sure feed operation even in the case where a locally thick part is sewed, by providing a slidable protrusion which can come into contact with a sewed part from above corresponding to a feed pawl, on the lower surface of a cloth slide contact plate part of a presser provided in a sewing machine to be a part on the downstream side from a needle position. SOLUTION: The presser 1 has an attaching base part 2 for a sewing machine, and a cloth slide contact bent plate part 3 provided at the lower end of the base part 2, so as to have an L-like shape. The cloth slide contact part 3 is formed therein with a needle hole 4 vertically piercing therethrough, and is provided with a removable chip 7 in a part on the downstream side from a needle position during sewing. This chip 5 has a planar part 5a, a locking piece part 5b standing upright on the lower surface of the flat plate part 5a, and a bank-like slidable protrusion 8 cooperating with a feed pawl 10 and provided on the lower surface of the flat plate part 5a. The slidable protrusion 8 is positioned so that it is extended rearward from the needle position when the chip 5 is attached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a presser foot provided on a sewing machine.

[0002]

2. Description of the Related Art As is well known, a sewing machine is provided with a presser for pressing a material on a sewing table (having a feed claw mechanism for feeding the material) at a portion where a needle moves up and down. ing. By the way, in order to sew a cutter shirt or the like, for example, as shown in FIG. 9, the end portion along the hemline L of the cloth W is sewn while being folded into three windings. In extension, the front body f and the back body b are inevitably intersected with the stitched portion K where the front body f and the back body b are joined. That is, at this intersection X, the three windings at the end (corresponding to the thickness of three sheets of cloth) and the stitched portion K (corresponding to the thickness of two sheets of cloth) make a total thickness of five sheets of cloth. It has a certainness.

[0003]

When the presser comes to ride on the locally thick portion (X) as described above during sewing along the hem line L, the material W is also lifted by the presser foot and the sewing table is also sewn. Since the fabric W is lifted up, the fabric W is not fed by the feed claws, so that the sewing work is delayed.

Therefore, conventionally, when such a locally thick portion (X) reaches the needle position, the sewing speed of the sewing machine is decelerated, and then the operator manually moves the cloth W in the feeding direction. I had to do something like pull strongly (to assist the operation of the feed claw mechanism). Therefore, there is a problem that the work efficiency is inferior and the work requires skill.

The present invention has been made in view of the above circumstances, and it is necessary to reduce the sewing speed one by one or pull the cloth by hand by an operator even when locally sewn a thick portion. The purpose of the present invention is to provide a presser foot that can prevent such problems.

[0006]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, according to the present invention as set forth in claim 1, in the presser provided on the sewing machine, the cloth slide contact plate portion is provided with a feed claw that pushes up the sewing portion of the cloth from below on the lower surface of the portion on the downstream side of the needle position. Correspondingly, a slider protrusion capable of abutting from above is projected on the stitched portion.

With such a construction, even if the presser comes to ride on a locally thick portion of the cloth,
The action of pressing the cloth is still continued due to the lug protrusions, and the cloth does not easily lift from the sewing table. Therefore, it is not necessary for the worker to pull the cloth by hand. Therefore, as a matter of course, it is not necessary to reduce the sewing speed of the sewing machine.

The cloth sliding contact plate portion is provided with a winding guide portion for folding the cloth into three windings at a portion on the upstream side of the needle position, and the winding guide portion guides the material. The receiving portion for supporting and holding the end portion of the dough is provided so as to be opened and closed laterally with respect to the winding guide portion, and both opening and closing positions thereof are respectively held by the biasing means. It is also possible (claim 2).

As described above, when the end portion of the cloth is folded in three and sewn in, it is preferable to provide the winding guide portion and the receiving portion with respect to the cloth sliding contact plate portion. If the positional relationship between the section and the receiving section is fixed, there is a problem that it is difficult to fold the end portions of the cloth into these at the initial stage of starting the sewing operation. Therefore,
A configuration is adopted in which the receiving portion is provided so as to be opened and closed laterally with respect to the winding guide portion, and this is useful in facilitating the sewing work as a whole and increasing the efficiency.

If the receiving portion can be held in the open state and the closed state by biasing means such as a leaf spring, the work of folding the end of the cloth can be further facilitated. On the other hand, the present invention according to claim 3 is characterized in that, in the presser provided on the sewing machine, at least the portion on the downstream side of the needle position of the cloth sliding contact plate portion is formed by a removable tip. .

In this case, it is assumed that the tip is provided with a slider projection that can come into contact with the stitched portion of the cloth from above in correspondence with the feed claw that pushes up the stitched portion of the cloth from below ( According to claim 4), by mounting this chip on the cloth sliding contact plate portion, the same configuration as in claim 1 can be obtained, and the same effect can be obtained. In such a configuration, another type of tip (for example, a tip having a guide groove into which a sewn-up portion of the cloth can be fitted, a tip having a flat surface, etc.) is prepared and prepared. By exchanging these depending on the type of stitch, it is possible to quickly and easily use the presser properly.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 2 to 5 show a presser foot 1 which is one of the embodiments of the present invention. The presser foot 1 is folded at a mounting base 2 to a sewing machine (not shown) and a lower end of the mounting base 2. It has a material sliding contact plate portion 3 provided in a curved shape and has a substantially L shape.

The cloth slide contact plate portion 3 has a needle hole 4 penetrating vertically.
The needle hole 4 is formed when it is attached to the sewing machine.
The sewing machine needle (not shown) is aligned so as to move up and down. Therefore, in the following, this needle hole 4 is referred to as "needle position".
It will be described as. In the cloth sliding contact plate portion 3, a portion on the downstream side of the sewing operation with respect to the needle position (a connection corner portion with the attachment base portion 2) is configured with a removable tip 5.

The tip 5 has a flat plate portion 5a having the same width as the cloth sliding contact plate portion 3 and a locking piece portion 5b standing upright at the rear end portion of the flat plate portion 5a. A screw insertion hole 5c is formed in the locking piece portion 5b. On the other hand, in the cloth slide contact plate portion 3, a fitting step portion 3a corresponding to the flat plate portion 5a of the chip 5 is formed on the bottom surface near the rear portion, and the chip 5 is fitted into the fitting step portion 3a. The screw hole 3b is formed in a portion of the locking piece portion 5b which can be aligned with the screw insertion hole 5c when it is opened. 6 is a mounting screw.

From the above, the positioning state of the chip 5 with respect to the cloth sliding contact plate portion 3 is adapted to a predetermined position. As shown in FIG. 6, the chip 5 is provided with a ridge-shaped sliding protrusion 8 on the lower surface of its flat plate portion 5a. The slider protrusion 8 is configured to attach the chip 5 to the cloth sliding contact plate portion 3
It is positioned so that it will be extended to the needle position when it is attached to.

Therefore, when the presser foot 1 is used to press the cloth W as shown in FIG.
It is possible to contact the stitched portion of the cloth W sent from the needle position to the rear (right side in FIG. 1) from above. That is, since the portion of the cloth W that is fed back from the needle position is pushed up from below by the feed pawl 10 of the feed pawl mechanism provided in the sewing machine, the cloth W is in this portion.
Has a shape in which the upper and lower sides are sandwiched by the feed claw 10 and the slide protrusion 8.

At the portion of the cloth sliding contact plate portion 3 which is on the upstream side of the needle position, a winding guide portion 12 for guiding the end portion of the cloth W to be wound into three folds is formed. The winding guide portion 12 has a long base portion 12a and a short base portion 12b that project in a bifurcated manner with the cloth feeding space 15 sandwiched from the left and right, and of these, the cloth feeding Space 1
5 is provided with a guide piece 16 protruding into the inside.

The guide piece 16 is formed by spirally bending a spring material. Also, on the side of the winding guide unit 12,
A receiving portion 18 for supporting and holding the guide of the cloth W is provided. The receiving portion 18 is formed by bending an arm portion 19 parallel to a side portion of the cloth sliding contact plate portion 3 and an upright shape at a rear end of the arm portion 19 so as to form a hinge portion 20 between the mounting base portion 2. The arm holding portion 21 and the projecting end portion of the arm portion 19 cross the leading edge side of the short base portion 12b of the winding guide portion 12 and fold back into the dough feeding space 15 into the spiral of the guide piece 16. It has a guide claw 22 that comes to protrude.

The guide claw 22 and the guide piece 16 as described above realize three-fold winding of the cloth W. The hinge portion 20 includes a hinge piece 21 protruding from the arm holding portion 21 and the attachment base portion 2 to the other side.
A and 2a are alternately superposed and skewed on the vertical axis 24, and the vertical axis 24 is prevented from coming off by a shaft retaining ring 25 (see FIG. 3). Therefore, the arm portion 19 can swing freely beside the cloth sliding contact plate portion 3, and the receiving portion 18 opens and closes with respect to the winding guide portion 12 from this movement. Reference numeral 26 is a knob for opening / closing operation.

Further, the cloth sliding contact plate portion 3 is provided with a plate-like urging means 27 projecting toward the arm portion 19. The urging means 27 is formed of an elastic plate such as a leaf spring material, and is attached to the mounting plate portion 2 that is bent in an L shape in a plane.
7a, and the mounting plate portion 27a has a long base portion 12a.
It is designed to be screwed in. In the urging means 27, the projecting end portion toward the arm portion 19 engages with the arm portion 19 in a spread state when the receiving portion 18 is opened with respect to the winding guide portion 12, and also the receiving portion 18 A hook portion 28 is provided that engages with the arm portion 19 in a retracted state when the is closed. Therefore, the receiving portion 18 is held at both open and closed positions thereof.

In the presser foot 1 having such a structure, after the receiving portion 18 is opened as shown by the chain double-dashed line in FIG.
The end of the cloth W is folded in three on the sewing table of the sewing machine, and the presser foot 1 is lowered. The guide piece 1 is used to guide the wound portion of the cloth W.
The receiving portion 18 is closed while being folded into the inside. If the sewing work is started in this state, L as shown in FIG.
The direction sewing will be automatically performed.

Here, the front and rear body parts f, b with respect to the presser foot 1
Even if the crossing portion X (the locally thick portion of the cloth W) where the sewn portion K crosses arrives and the presser foot 1 rides on this, it protrudes from the lower surface of the presser foot 1 as is apparent from FIG. The sliding protrusions 8 holding the cloth W are pressed down. That is, as the presser foot 1 rises, the cloth W
Does not come off the sewing table, so the fabric W
The feed action of the feed pawl 10 on the is still effectively continued.

Therefore, it is not necessary for the operator to pull the cloth W by hand, and it is not necessary to reduce the sewing speed of the sewing machine one by one. By the way, the chip 5 which can be attached to and detached from the cloth sliding contact plate portion 3 has
And it is convenient to prepare another type as shown in FIG. The tip 5 shown in FIG. 7 is provided with a guide groove 30 into which a sewn-up portion of the cloth W can be fitted instead of the slide protrusion 8. Therefore, locally thick part (X)
It is useful as a straight stitch when sewing a fabric W (for example, a handkerchief or the like) that does not have.

Further, the tip 5 shown in FIG. 8 has a lower surface which is a flat surface having neither the slider projection 8 nor the guide groove 30. Therefore, it is useful as curved stitches. Of course, the chip 5 shown in FIGS. 7 and 8 has the same external dimensions and the mounting structure to the cloth sliding contact plate portion 3 in common with the chip 5 shown in FIG. The present invention is not limited to the above embodiment.

For example, the shape, size, material and the like of the chip 5 can be arbitrarily changed. Of course, it is not limited that the chip 5 can be attached to and detached from the material sliding contact plate portion 3, and the material sliding contact plate portion 3 may be integrally formed with the slider protrusions 8.

[0026]

As is apparent from the above description, according to the present invention as set forth in claim 1, a slider projection is provided on the lower surface of a portion of the cloth sliding contact plate portion which is on the downstream side of the needle position. Therefore, even if the presser foot rides on a locally thick part of the fabric,
The slider protrusions hold down the material and prevent it from rising from the sewing table. Therefore, the sewing work can be continuously and smoothly performed at the same speed without requiring the assistance of the worker, and the work can be facilitated and the efficiency can be improved.

As described above, in the cloth, the locally thick portion is often generated when the end portion of the cloth is folded into three windings and sewn in. In this case, the cloth is slid on the sliding plate. A stitching guide portion and a receiving portion are provided, and the receiving portion can be opened and closed laterally with respect to the winding guide portion and both opening and closing positions can be held by the biasing means (claim 2). There is an advantage that the work of folding the end portion of the cloth between the winding guide portion and the receiving portion can be facilitated at the initial stage of starting the. Further, there is an advantage that it is possible to easily correct the winding state of the cloth and easily perform repair and adjustment when the guide piece is deformed.

On the other hand, if at least the portion on the downstream side of the needle position of the cloth sliding contact plate portion is constituted by a removable tip (claim 3), the tip can be exchanged with another type and used as a presser foot. The advantage is that it can be used quickly and easily according to the type of seam. In particular, if a chip having a slider protrusion is prepared for manufacturing (Claim 4), it is easy to obtain the same structure as that of Claim 1 by attaching the chip to the cloth sliding contact plate portion. There is.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a state of a presser foot as an example of an embodiment of the present invention when viewed from a direction of an arrow D in FIG.

FIG. 2 is an exploded perspective view showing a presser foot, which is an example of an embodiment of the present invention.

FIG. 3 is a side view showing a presser foot as an example of the embodiment of the present invention as viewed from the direction of arrow A in FIG.

FIG. 4 is a front view showing a presser foot, which is an example of an embodiment of the present invention, as viewed in the direction of arrow B in FIG.

FIG. 5 is a plan view showing a presser foot as an example of the embodiment of the present invention as viewed from the direction of arrow C in FIG.

FIG. 6 is a perspective view showing a chip provided with a slider protrusion in a state of being looked up from diagonally rearward thereof.

FIG. 7 is a perspective view showing a chip provided with a guide groove in a state of looking up from an obliquely rear side thereof.

FIG. 8 is a perspective view showing a chip whose entire lower surface is a flat surface, as viewed from diagonally rearward thereof.

FIG. 9 is a perspective view showing an example of a sewn product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Presser 3 Fabric sliding contact plate 5 Chip 8 Sliding protrusion 10 Feeding claw 12 Entrainment guide 18 Receiving part 27 Energizing means W Fabric

Claims (4)

[Claims] 1. In a presser foot provided on a sewing machine, a feed claw (3) that pushes up a stitched portion of a material (W) from below on a lower surface of a material sliding contact plate portion (3) on the downstream side of a needle position. A presser foot for a sewing machine, which is characterized in that a slider projection (8) which can come into contact with the sewing portion from above is provided in a protruding manner corresponding to 10). 2. The cloth slide contact plate portion (3) is provided with a winding guide portion (12) for folding the cloth (W) into three windings at a portion on the upstream side of the needle position. At the same time, a receiving portion (18) for assisting and holding the end portion of the cloth (W) being guided by the winding guide portion (12) is provided so as to be opened and closed laterally with respect to the winding guide portion (12). 2. The presser foot for a sewing machine according to claim 1, wherein both the open and closed positions are held by the biasing means (27). 3. A presser foot provided on a sewing machine, characterized in that the cloth sliding contact plate portion (3) is composed of a removable tip (5) at least at a portion on the downstream side of the needle position. The presser foot of the sewing machine. 4. The tip (5) has a slider projection (8) capable of abutting from above the stitched portion of the cloth (W) corresponding to a feed claw (10) which pushes up the stitched portion from below. ) Is provided so as to project from the sewing machine.