JPS6219341Y2 - - Google Patents

Description

[Detailed description of the invention] This invention consists of a needle that moves up and down with needle thread, a needle thread catcher that captures the needle thread loop of the needle to form a stitch, and a needle that moves in four directions in conjunction with the sewing machine mechanism. A cloth feeding mechanism that appears and retracts from the top surface of the plate to feed the cloth, an upper presser foot that is supported by the presser foot and feeds the cloth in cooperation with the cloth feeding mechanism, and a support fixed to the presser rod that supports four movements on the top surface of the throat plate. The present invention relates to a sewing machine that is equipped with a cloth feed mechanism and an upper feed mechanism that feeds cloth in cooperation with the cloth feed mechanism.

This type of sewing machine is already well known as in Utility Model Publication No. 57-55813, and this type of sewing machine is mainly used to sew two slippery pieces of fabric together to prevent them from slipping, and to sew the fabric by the upper feed mechanism. It is used for gear sewing, etc., in which the upper cloth of two overlapping cloths is fed more than the lower cloth to form pleats by making the cloth feeding amount larger than the cloth feeding amount of the lower cloth feeding mechanism.

However, in general sewing factories, it is extremely rare for the above-mentioned sewing to be carried out all the time, and when such sewing is not necessary, this type of sewing machine becomes idle, and
When using a sewing machine with this upper feed mechanism to perform sewing that requires careful handling of the fabric, the upper feed dog, which moves four times above the throat plate, obstructs the sewing work and reduces sewing efficiency. .

Furthermore, depending on the type of cloth to be sewn, the upper feed dog may cause scratches on the cloth, reducing the commercial value of the product.

In this way, this type of conventional sewing machine with an upper feed mechanism can only be used for specific sewing processes.
It lacked versatility.

In view of the above-mentioned circumstances, the purpose of this invention was to provide versatility to a sewing machine having an upper feed mechanism.

An embodiment will be described below with reference to the drawings. FIG. 1 shows a known upper feed mechanism as described in Japanese Utility Model Publication No. 57-55813, in which a sub-presser bar 2 is installed in the hollow interior below the presser bar 1. A spring 4 is loosely fitted and has an elastic force weaker than the downward elastic force (not shown) acting on the presser bar 1 between its upper end and an adjustment screw 3 screwed into the hollow interior of the presser bar. Reference numeral 5 denotes a support whose base is fixed to the lower end of the presser bar 1, and forms a bifurcated arm 7 which hangs down from the base in the cloth feeding direction and supports a shaft 6 at its lower end.

Reference numeral 8 designates an upper feed presser foot, the upper end of which is fitted into a support part 5a formed on one end surface of the support body 5, which has horizontal grooves formed on the upper and lower sides, and is fixed with a screw 5b. An upper feed presser foot 9 having a needle hole (not shown) formed therein is supported. Reference numeral 10 denotes an upper feeder, which is located below the sub-presser bar 2 and has an upper feeder foot 8.
The flat engagement part 11 placed on the guide part 20 of
The shaft 6 receives the downward force of the spring 4 via the sphere 12, and forms a long hole 13 which is elongated in the cloth feeding direction and into which the shaft 6 is loosely fitted. Further, an upper feed dog 16 is fixed to the upper feed body 10. A bent part of an L-shaped lifting link 21 is rotatably supported by a shaft 22 in the middle part of the arm 7 of the support body 5, and the tip of the lifting link 21 is located below the engaging part 11 of the upper feeder 10. do.

Reference numeral 23 denotes a horizontal upper feed shaft that swings about a fixed axis in conjunction with the main shaft 24 of the sewing machine, and is connected to one end of the upper feed body 10 via an arm 25 and links 26, 27, and 28, and is connected to one end of the upper feed body 10 to control the horizontal upper feed. The swing of the shaft 23 imparts horizontal movement to the upper feeder 10 along the cloth feed direction line. Reference numeral 29 denotes an eccentric cam provided on the main shaft 24, which is connected to one end of the lifting link 21 via a rod 30 and links 31 and 32, and swings the lifting link 21 by the rotation of the eccentric cam 29, thereby causing the upper feeder 10 to move. On the other hand, rotational motion about the shaft 6 is applied. The swing of the horizontal upper feed shaft 23 and the rotation of the eccentric cam 29 give the upper feed body a horizontal movement and a rotational movement about the shaft 6, thereby causing the front end surface of the upper feed body 10 to The upper feed dog 16, whose base is fixed, performs four movements for feeding the cloth on the upper surface of the cloth.

Although not shown, the sewing machine shown in FIG. 1 has a well-known needle that has a needle thread and moves up and down in conjunction with the rotation of the main shaft 24, and a bobbin thread that captures the needle thread loop of the needle. A hook as a needle thread catcher that forms a main stitch with the needle thread and bobbin thread, and a hook that moves four times in conjunction with the main shaft 24, protrudes and retracts from the upper surface of the throat plate, and is attached to the upper feed presser foot 9 and the upper feed dog 16. It is equipped with a cloth feeding mechanism that works together to feed the cloth.

FIG. 2 is an exploded perspective view, and 5 is a support fixed to the lower end of the presser bar 1 described above.

33 is a presser fixture, which is attached to the support part 5 of the support body 5.
A fitting groove 34 as a fitting portion that can be fitted to the support body 5, a hole 35, and a horizontal protrusion 36 facing the lower surface of the support body 5 are provided, and the lower end surface is provided with a fitting groove 34 as a mounting portion that can be fitted to Presser foot (lower) 3 specified by B9080
For attaching the presser foot (top) 38 (standard presser foot) with 7, the mounting foot 40 has the shape and dimensions as a taper of 11 degrees and 30 minutes specified by Japanese Industrial Standard (JIS) B9068 and has a screw hole 39 on the end surface. Form.

This invention has the above-mentioned structure, and Figure 1 shows how it can be used in processes such as sewing two slippery pieces of cloth together without shearing them, or forming pleats only on the upper cloth of two overlapping cloths, etc. , when used as a normal top feed sewing machine. Therefore, in this case,
As the main shaft 24 of the sewing machine rotates and the horizontal feed shaft 23 swings, the upper feed body 10 moves as described above.
makes a horizontal movement along the cloth feeding direction line, and
The lifting link 21 swings back and forth around the shaft 6, and these two movements cause the upper feed dog 16 to perform four movements for feeding the fabric, and feed the fabric in cooperation with the fabric feeding mechanism below the throat plate. , the upper feed presser foot 9 also feeds the cloth in cooperation with the cloth feed mechanism below the throat plate by downward pressing force.

Next, when used as a general sewing machine that does not require an upper feed mechanism, the upper feed member 10, link 28, and lifting link 2 near the support 5 shown in FIG.
1. Remove the link 32, etc., and also remove the upper feed presser foot 8 fixed with the screw 5b to form the support 5 shown in FIG. 2.

And the fitting groove 3 of the presser fixture 33 shown in FIG.
4 is fitted into the support part 5a of the support body 5, and then the presser fixture 33 is fixed to the support body 5 with screws 5b as shown in FIG. At this time, the mounting foot 40 of the presser foot fixture 33 is located under the presser bar 1, and the presser foot (upper) 38 (standard presser foot) specified in the Japanese Industrial Standards as shown in FIG. ) is fixed by screwing the screw 41 into the screw hole 39 as shown in FIG.

As a result, the presser foot (lower) 37 shown in FIG. 3 feeds the cloth in the same manner as in a general sewing machine in cooperation with the cloth feed mechanism that moves four times below the throat plate due to the downward pressing force on the presser foot bar 1.

In addition, it has the same attachment shape as the presser foot (upper) 38 specified in this type of Japanese Industrial Standards, and the presser foot (lower)
There are many types of products on the market that are equipped with cloth edge wrappers, tapes, strings, and other guiding tools. Can do many types of sewing.

In the above embodiments, the sewing machine shown in FIG. 1 was explained as a sewing machine that forms a regular stitch with needle thread using a needle with needle thread and a shuttle with bobbin thread. There are sewing machines with an upper feed mechanism that forms single thread chain stitches using a single thread looper as a needle thread catcher that swings or rotates on the lower surface of the throat plate, and sewing machines that have a needle with needle thread and a looper thread with an oscillating mechanism. The present invention can also be applied to sewing machines having an upper feed mechanism that forms a double chain stitch using a looper as a moving needle thread catcher.

As described above, in this invention, the presser foot fixture 33
A mounting part 34 and a standard presser foot mounting foot 40 which are detachable from the support part 5a of the upper feed presser foot 8 of the support body 5 are provided, and this presser foot attachment tool 33 is attached to the support body 5 of the upper feed sewing machine. Therefore, in addition to the conventional top-feed sewing machine, it can also be used as a general sewing machine using a free presser foot, or it can be used as a general sewing machine using a free presser foot, or with various types of presser foot on the market that have guiding devices such as cloth edge wrappings, tape, string, etc. This has the effect of making the top feed sewing machine more versatile, allowing the sewing machine with the top feed mechanism to be used for many other types of sewing.
This has the effect of significantly increasing the operating rate of top-feed sewing machines.

[Brief explanation of drawings]

Fig. 1 is a side view of a conventional top-feed sewing machine with a top-feed mechanism, Fig. 2 is a perspective view of the support shown in Fig. 1, the presser foot mount of this invention, and a standard presser foot, and Fig. 3 is a perspective view of a standard presser foot. It is a side view attached to a presser fixture. 5: Support body, 5a: Support portion, 33: Presser fixture, 34: Fitting groove as a mounting portion, 40: Mounting foot.

Claims (1)

[Claims for Utility Model Registration] An upper feed mechanism that is fixed to the lower end of the presser bar which normally receives downward pressing force and that has upper feed teeth and moves in conjunction with the sewing machine mechanism; A mounting portion 34 that can fit into the support portion 5a of the support 5 and a mounting foot 40 to which a standard presser foot 38 can be attached and detached are formed on the support 5 that supports the upper feed presser foot 8. A presser foot fixture for a top feed sewing machine, characterized in that a presser foot fixture 33 is removably attached to a support portion 5a.