JP3069939U - Sewing section of sewing machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a sewing portion of a sewing machine which enables smooth cloth feeding even when sewing cloth having a large friction which has been subjected to a treatment such as anti-slip. A sewing section of a sewing machine is provided with a cloth feeding section 4 for feeding cloths 1a and 1b in a certain direction, and a needle plate 2 for receiving cloths 1a and 1b to be fed. And a sewing needle 10 that moves forward and backward so that the needle plate 2 and the presser foot 3 are inserted.
The presser foot 3 is provided with predetermined surface coatings 6 and 8 over the surfaces that come into contact with the cloths 1a and 1b at the time of sewing. The surface coatings 6 and 8 are made of PTFE (polytetrafluoroethylene) particles using nickel as a base metal. This is formed by an electroless nickel-phosphorus PTFE composite plating process of curing by heat treatment.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a sewing portion of a sewing machine for sewing a cloth, and more particularly, to a sewing portion of a sewing machine capable of performing a smooth cloth feed even when sewing a cloth having a large friction which has been subjected to a non-slip treatment or the like.

[0002]

[Prior art]

 The sewing portion of the sewing machine includes a needle plate for receiving a cloth to hold a cloth to be sewn, and a presser foot for pressing the cloth with a predetermined pressure. The needle plate further includes a cloth feeding section for feeding the cloth in a certain direction, and the cloth feeding section can continuously sew the cloth while feeding the cloth in a certain direction.

[0003]

[Problems to be solved by the invention]

 However, since the fabric to be sewn is held between the needle plate and the presser foot, it rubs against the contact surface between the needle plate and the presser foot when the fabric is fed, and is subjected to special treatment such as non-slip. When sewing a sewn cloth, a large frictional force is applied, so that there is a problem that the cloth cannot be fed smoothly.

[0004] An object of the present invention is to provide a sewing portion of a sewing machine that can smoothly feed a cloth even when sewing a cloth with a large friction which has been subjected to a treatment such as anti-slip.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, a needle plate for receiving a cloth to be fed is provided with a cloth feeding portion for feeding a cloth in a certain direction, a presser foot for pressing the cloth against the needle plate at a predetermined pressure, and a needle for these needles. In a sewing portion of a sewing machine including a sewing needle that advances and retreats so as to insert a plate and a presser foot, the needle plate and the presser foot have a predetermined surface coating covering a surface that comes into contact with a cloth at the time of sewing. The coating is formed by co-depositing PTFE (polytetrafluoroethylene) particles using nickel as a base metal and subjecting the particles to heat treatment and hardening by electroless nickel-line PTFE composite plating.

[0006] The surface of the needle plate and the presser foot of the sewing portion of the sewing machine having the above configuration has a self-lubricating film formed by electroless nickel / lin PTFE composite plating, thereby reducing the frictional force during cloth feeding. Therefore, non-slip cloth or other cloth having a large frictional force can be sewn with uniform stitches without receiving excessive resistance to the feeding operation of the cloth feeding section.

[0007] The sewing needle is made of eutectoid PTFE (polytetrafluoroethylene) particles using nickel as a base metal, and heat-hardens the PTFE particles to form a surface coating by electroless nickel-phosphorus PTFE composite plating treatment. Since the surface of the sewing needle forms a self-lubricating film by forming in the insertion range, the frictional force when the cloth is inserted into and out of the sewing needle is reduced. With a cloth having a large frictional force, a variation in sewing load can be suppressed and a uniform seam can be secured.

[0008]

[Embodiment of the invention]

 An embodiment of the invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a sewing portion of the sewing machine according to the present invention. The sewing portion of the sewing machine includes a needle plate 2 for receiving the cloths 1a and 1b to be sewn, and a presser foot 3 for pressing the cloths 1a and 1b against the needle plate 2 with a predetermined pressure.

The needle plate 2 is provided with a cloth feeder 4 for feeding cloths 1 a and 1 b in a fixed direction on a small window 5 formed facing the presser foot 3. A predetermined surface is coated with the coating 6. The presser foot 3 is provided with a guide portion 7 that is inclined to guide the cloth at its tip end, and the lower surface of the presser foot 3 including the guide portion 7 is covered with a predetermined surface coating 8. The presser foot 3 is swingably held at the lower end of the vertical rod 9 for applying a predetermined pressure to the lower cloth so as to follow the surface of the cloth.

The surface coating 6 of the needle plate 2 and the surface coating 8 of the presser foot 3 are made of a co-deposited PTFE (polytetrafluoroethylene) particle using nickel as a base metal, and heat-cured and hardened by electroless nickel-phosphorus. Each is covered with a PTFE composite plating process.

Further, if necessary, a surface coating (not shown) is formed on the surface of the sewing needle 10 by the electroless nickel-phosphorus PTFE composite plating process. This surface coating is formed at least in a range through which the cloth is inserted.

The surfaces of the needle plate 2 and the presser foot 3 of the sewing portion of the sewing machine having the above-described structure are coated with the PTFE particles due to the presence of the self-lubricating surface coatings 6 and 8 formed by electroless nickel-phosphorus PTFE composite plating. It acts between the contact object and the frictional force during cloth feeding. Therefore, non-slip cloth or other cloth having a large frictional force can be smoothly sewn with uniform seams without receiving excessive resistance to the feeding operation of the cloth feeding section 4.

Since the sewing needle 10 is provided with a self-lubricating coating on its surface, the frictional force when the cloth is inserted into and retracted from the cloth is reduced. A uniform seam can be secured by suppressing the fluctuation of the sewing load for a cloth having a large force. Since the composite plating process does not impose any special restrictions on the material on which the film is to be formed, the present invention is applied to a sewing needle of iron or synthetic resin material or a general material configuration in which the surface is nickel-plated. By applying the above, the above-described operational effects can be obtained.

[0014]

[Effect of the invention]

 The sewing portion of the sewing machine according to the present invention has the following effects. The surface of the needle plate and the presser foot at the sewn portion of the sewing machine having the above configuration has a self-lubricating film formed by electroless nickel / lin PTFE composite plating, thereby reducing frictional force during cloth feeding. Therefore, smooth sewing with uniform seams can be performed on non-slip cloth or other cloth having a large frictional force without receiving an excessive feeding force from the cloth feeding mechanism.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sewing portion of the sewing machine according to the present invention.

[Explanation of symbols]

 1a, 1b cloth 2 needle plate 3 presser foot 4 cloth feeder 5 small window 6 surface coating 8 surface coating 10 sewing needle

Claims (2)

[Utility model registration claims] 1. A needle plate for receiving a cloth to be fed provided with a cloth feeding section for feeding a cloth in a certain direction, a presser foot for pressing the cloth against the needle plate at a predetermined pressure, and a needle plate and a presser foot. And a sewing needle comprising a sewing needle which advances and retreats so that the needle plate and the presser foot are provided with a predetermined surface coating covering a surface which comes into contact with the cloth at the time of sewing. A sewing portion of a sewing machine, which is formed by a phosphorus PTFE composite plating process. 2. An electroless nickel-phosphorus PT, wherein the sewing needle is made of eutectoid PTFE (polytetrafluoroethylene) particles using nickel as a base metal and heat-cured.
2. A surface coating formed by FE composite plating is formed at least in a range through which a cloth is inserted.
Sewing part of the described sewing machine.