KR101294466B1 - Sewing machine with a base designed to hold interchangeable means for sewing fabrics using different types of stitch - Google Patents

Abstract

This is a sewing machine (1), preferably of the industrial type, with a base (2) designed to mechanically sew two pieces of fabric together using different types of sewing stitch by simply and quickly replacing a few components housed in the base itself (2).

Description

SEWING MACHINE WITH A BASE DESIGNED TO HOLD INTERCHANGEABLE MEANS FOR SEWING FABRICS USING DIFFERENT TYPES OF STITCH}

1A shows the structure of a note stitch;

1B shows the structure of a double-chain stitch;

1 is a projection view showing a sewing machine including a base, according to the object of the present invention;

2 is a front projection view from the top of the base assembled with parts configured to sew note stitches;

3 is a side projection view from above of the base in FIG. 2;

4 is a developed side projection view seen from the top of the base in FIG. 2;

5 is a front projection view from the top of the base assembled with parts configured to sew a chain stitch;

FIG. 6 is a developed side projection view seen from the top of the base in FIG. 5; FIG.

FIG. 7 is a developed side projection view from the top of the base in FIG. 5;

<Description of the symbols for the main parts of the drawings>

1: sewing machine

2: base

5: hook

6: bush

7: 1st axis

9: gear

12: spindle

The industrial patent invention application proposes a base specifically designed for industrial sewing machines, designed to mechanically sew two pieces of fabric using various types of sewing stitches by easily and quickly replacing several parts included in the sewing machine. do.

As a result, parts for sewing machines having a specific function can sew two pieces of fabric by at least two different types of sewing stitches by replacing some parts quickly and easily.

A sewing machine is, as is known, in most ordinary forms, a machine for sewing two fabrics mechanically. In the industry, it is recognized that different structural technologies are applied depending on the various operations they intend.

For example, single or multiple needle units are generally used to sew garments such as jeans or casual pants, work clothes and shirts or many other types.

The industrial sewing machine according to various forms can sew a yoke, top or bottom, leg riveting or various parts and can be used in various forms for light or heavy fabrics.

In general, all of the above versions include means for forming a sewing stitch with the needle, the base being positioned below the upper head and a system for supplying the fabric for sewing, and the upper head on which the needle is located. .

The rotational movement in the upper head, powered by an axis connected to the drive motor, is converted into reciprocating motion through an eccentric, which is then transmitted to the needle-holder support. A fabric-pressure foot is located in the upper head in a position proximate to the needle and functions to press the fabric operation to be sewn downward toward the lower base.

In general, a fabric feed system includes specific means that act to move the fabric in one direction and to sew it onto the fabric.

The base located at the bottom of the upper head includes one or more hooks that terminate the sewing stitch with the needle.

All of the above-described parts, in rotational and translational motion, move simultaneously with each other.

Of particular importance in the manufacture and configuration of sewing machines depends on the form of making the sewing stitch.

Of course, each different sewing stitch requires different movements and different parts by the parts. As a result, various sewing machines are used for various sewing stitches.

For example, in order to form a knot stitch according to the known art, the device must have a particular hook which is in synchrony and continuous rotational motion required for the translational movement of the needle corresponding to two 360 ° hook rotations. do.

On the other hand, the device for forming the chain stitch has concurrency requiring the translational movement of one needle corresponding to one movement by the hook, and the reciprocating and / or translational movement, and from the hook for the knot stitch It should have a hook that has a shape.

In addition, in order to form a note stitch with the need to exert a reciprocating force with the hook, manufacturers manufacture devices with structures that differ significantly from the structure of the device used to form the note stitch.

Another difference between the two types of devices is that the note stitch device has a robbin with a thread inserted inside the hook, while the chain stitch device has a variety of devices mounted outside of the device. There is.

An important and substantial difference between the two types of devices lies in the formation of the double-chain stitch shown in FIG. 1B and the note stitch shown in FIG. 1A, and in a wide variety of forms.

According to the known art, it is necessary to form two different types of sewing machines for two different types of sewing stitches.

This incurs significant costs for businesses or consumers in the textile industry that are required to provide speed flexibility, significant flexibility in functionality and flexible services in their methods.

The object of the invention, which is the object of the patent application, is to overcome not only the above mentioned problems but also other problems arising from a single device capable of alternately forming a note stitch and a double-chain stitch by simply and easily replacing some parts. have.

The above range and advantages according to the invention are achieved by a sewing machine characterized by having a base in the form for inserting a means designed to sew in a double-chain stitch alternately with a means configured to sew in a note stitch.

A device constructed in this way has the preferred advantage of forming two different types of sewing stitches by using a single structure in which a particular means can be replaced depending on the desired type of stitch.

It is therefore an object of the present invention to generate significant economic benefits and to eliminate the need to purchase two different devices. In addition, the sewing machine can be replaced by means configured for various types of stitches in a quick and easy manner. Other features and details of the invention will be more clearly understood in accordance with the given non-limiting examples, detailed description as well as the accompanying drawings.

In the accompanying drawings, the number 1 is basically all parts designed to work properly such as the upper head 4, the fabric movement device 3 and the base 2 and the present invention. Represents a sewing machine (base) comprising a base (base 2) according to the purpose of.

In particular, the base 2 accommodates a variety of movements and sewing means to form two different types of sewing stitches: knotted stitches and double-chain stitches. And a support structure 23 designed to be.

In one possible form, the structure 23 of the base 2 shown in FIGS. 2, 3 and 4 has a cylindrically perforated first bush positioned in a stationary state relative to the structure when inserted into the structure 23. Accept first bush, 6). The first bush 6 has a longitudinal hole in which one of the ends of the first shaft 7 is connected to the first hook 5 and the first shaft 7 is inserted. , 24). These parts are held in a stable position by at least one shim ring 8.

In addition, the gear 9 is fastened to the end of the first shaft 7 opposite the end where the first hook 5 is located. The gear is engaged by suitable means with the main shaft 12 which transmits power to the first shaft 7, and then with the first hook 5.

This makes it clear how the first shaft 7 and the first hook 5 rotate continuously when the main shaft 12 makes a continuous rotational motion.

The base 2 described above forms a knot type of stitch so that the movement of the needle of the sewing machine coincides with all the translational movements of the needle, and corresponding two full turn turns by the first hook 5. turn rotation) is formed.

When there is a need to form a double-chain stitch, the above described parts can be removed from the base 2 (first hook 5, shim ring 8, first bush 6, first Shaft 7 and gear 9) The parts are replaced by new means combined to sew in a double-chain stitch.

The new shaped base 2 shown in FIGS. 5, 6 and 7 requires the insertion of a cylindrical second bush 17 into a perforation in the structure 23. The second bush has a longitudinal hole 25 positioned away from the center with respect to the axis of the second bush itself.

The second shaft 18 is located inside the hole 25. One of the ends of the second axis is a shim ring 16, hook bush 15, needle-guard which are integrally formed with the hook bush 15, for example by means of certain engagement means such as screws. (needle-guard) 14 and a second hook 13 are formed.

The other end of the second shaft 18 is connected to the main shaft 12 which reciprocally rotates the second shaft 18 using specific means. This is achieved in particular by means of an eccentric 19 located inside the hole of the connecting rod 20, by means of the main shaft 12 making continuous rotation, with the ends of the opposing eccentric 19 being fixed. In order in turn to the lever 21 fastened to the second shaft 18.

Due to the lever, the continuous rotational movement of the main shaft 12 is converted into a reciprocating rotational movement, which is transmitted to the second axis 18 and consequently to the second hook 13. This type of motion is designed to perform the type of motion required to form a chain stitch.

In this case, the means described above are also fastened to the structure 23 on the base 2 using clamping parts and assembly screws.

A device designed to open a loop to form a chain, in particular a third shaft 11, which remains mounted on the base 2 in the presence of parts designed to form a note stitch, may be provided. Can be.

The sewing machine according to the object of the present invention is provided with a base 2 comprising, for example, fastening means, such as a structure 23, and comprising first means (first hooks 5, first) configured to form a note stitch. The bush 6, the first shaft 7, the shim ring 8, the gear 9 have a second means (second hook 13, needle guard 14, hook) configured to form a double-chain stitch. It may be replaced by a bush 15, a shim ring 16, a second bush 17, a second shaft 18, a lever 21, a connecting rod 20, an eccentric 19.

In particular, the moving parts replaced to form both a note stitch and a double-chain stitch are powered by the same main shaft 12 (drive shaft).

Thanks to this sewing machine, it is possible to replace several parts easily and quickly, according to a known technique that can be performed in opposition by various sewing machines, and by double stitching with a note stitch as shown in FIGS. 1A and 1B. Two different types of stitching stitches can be formed.

In addition, removal and reinstallation of the various parts on the base 2 can be performed by a person skilled in the art without specialized knowledge.

Those skilled in the art can envision modifications or variations that are deemed to fall within the protection scope of the present invention.

Claims (7)

First means configured to sew by forming a note stitch and comprising a first hook 5, a first bush 6, a first shaft 7, a shim ring 8 and a gear 9; Designed to sew by forming a double-chain stitch, the second hook 13, the needle-guard 14, the hook bush 15, the shim ring 16, the second bush 17, the second shaft 18 And a base portion 2 and a main shaft 12 configured to alternately insert a second means composed of an eccentric portion 19, a connecting rod 20, and a lever 21, At least one of the first means 5, 6, 7, 8, 9 and the second means 13, 14, 15, 16, 17, 18, 19, 20, 21 interchangeable with each other is the main shaft 12. ), The main shaft 12 is connected to the first means 5, 6, 7, 8, 9 and the second means 13, 14, 15, 16, 17, 18, 19, 20, 21. In the sewing machine for driving the The main shaft 12 is connected to the first shaft 7 by a gear 9, the end of the first shaft 7 is fixed to the first hook 5, the first shaft 7 being In the hole 24 of the first bush 6 inserted in the base 2 and through the shim ring 8, the first shaft 7 and the gear 9 are formed to form a knot type stitch. Sewing machine, characterized in that to generate a continuous rotational movement of the first hook (5). 2. The main shaft (12) according to claim 1, wherein the main shaft (12) is connected to the second shaft (18) by an eccentric portion (19), a connecting rod (20) and a lever (21), the end of the second shaft (18) being hooked. Secured to the needle-guard 14 and the second hook 13 by the bush 15, the second shaft 18 being in the hole 25 of the second bush 17 inserted in the base 2. And move through the shim ring 16, the second shaft 18, the eccentric portion 19, the connecting rod 20 and the lever 21 to form a double-chain type stitch. 13) a sewing machine characterized by generating a reciprocating rotational motion. The main shaft according to claim 2, wherein an eccentric (19), which is in turn connected to the lever (21) fixedly coupled to the second shaft (18), inserted into the hole of the connecting rod (20) Sewing machine, characterized in that the continuous rotational movement of the main shaft (12) is converted into reciprocating rotational movement by the second shaft (18). A sewing machine as claimed in claim 3, wherein the second bush (17) is eccentric. delete delete delete

Images