JPH06315579A - Sewing machine for welt seam - Google Patents

Abstract

PURPOSE:To constitute the front end part of cloth of the sewing machine for welt seam so that as for the part for starting sewing, usually welt seam of specific length cannot be executed, and welt seam can be executed from the start of sewing of cloth, because the upper dog exists in the tip of a sewing needle. CONSTITUTION:On a throat plate 54, long grooves 56, 60 and 61 of plural lines are pierced, and so as to face a pair of holding plates provided in the lower part of the throat plate 54, feed dog parts 57, 59 and 62 of a first feed dog 51 and a second feed dog 52 are inserted into the long grooves 56, 60 and 61, and operated, and by cooperation of a curved needle and a looper, welt seam is formed on cloth.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD This application relates to a rake stitch sewing machine. More specifically, the present invention relates to a presser foot and a feed mechanism for a sewn sewing machine.

[0002]

2. Description of the Related Art A rake stitch sewing machine of this type which has been conventionally used has an upper feed dog at the tip of a curved sewing needle, so that the cloth can be bent to a certain distance. The sewing work starting from the end of the fabric is impossible unless the knee is raised to the sewing position or is manually fed out. Normally, the tip of the fed fabric should be raked by about 4 to 5 cm. There are places that can not be. Therefore, in the case of manually feeding the fabric from the tip end to below the feed dog, there is a problem that the fabric needs to be fed up to the sewing position of the curved needle by operating the knee lift. It was impossible to start sewing from the end. Therefore, with reference to the accompanying drawings, an outline of a conventional rake stitch sewing machine of this type will be described. FIG. 6 is a perspective view of a conventional rake stitch sewing machine before incorporating the improved presser foot and feed dog of the present invention. First, the configuration of the conventional example will be described. If the main parts of this kind of rake stitch sewing machine are indicated by reference numerals, 2 is a thread hook rod, 4 is a pulley,
6 is a scoop adjustment dial, 8 is a lower shaft case, 10 is a knee lifter, 12 is a base, 14 is an auxiliary table, 16 is a curved needle,
18 is a looper, 20 is a feed dog, 22 is an arm, 24 is a sewing thread automatic control device, 23 is a pair of thread tension discs, 26 is a thread tension spring, and 25 is a thread stand bar. 54 illustrated in FIG.
Is a needle plate set, and 55 is a presser foot set. FIG. 8 is an enlarged exploded perspective view of the feed dog 20 of FIG. 6, and 46 and 47 respectively show a feed dog washer and a feed screw. FIG. 9 is an enlarged exploded perspective view of the curved needle 16, 19 is a needle clamp, and 21 is a needle clamp screw. Next, FIG. 10 shows an enlarged exploded perspective view of the looper 18. Reference numeral 28 is a looper base, and 31 is a looper retaining screw. FIG. 11 is an enlarged exploded perspective view of a pair of cloth retainers 70 arranged below the needle plate 54.
72, presser spring 73, presser mounting shaft thrust collar 79,
It is assembled with the presser mounting screws 80, 80 and the like, and is disposed on the lower surface of the long hole 53 provided in FIG. 7. As described above, the defect that the rake seam is not formed by the curved needle 16 and the looper 18 cannot be overcome unless the cloth is fed by the feed dog 20 to a certain distance. The invention of this application is
The purpose is to solve the above problems, and the outline of the means for solving the problems will be described below.

[0003]

Means for Solving the Problems A needle plate set (54) is provided with three feed dog actuating grooves (56), (60), (61), and a pair of feed dog heads separately provided. The feed dogs (57), (59) and (62) are respectively formed on the first feed dog (51) and the second feed dog (52) including the portion (50). The feed dog actuating groove (56) is provided with the head portion (50) of the first feed dog (51), the groove (61) is provided with the tooth portion (62), and the groove (6).
0) has teeth (57), (59) of the second feed dog (52).
Is operably inserted from above, and the groove (5
Members (83) and (84) for pressing the cloth are arranged on the lower surfaces of 6), (60) and (61) to hold the pressing members (83),
The cloth fed on (84) is fed forward by the first feed dog (51) and the second feed dog (52), and is sewn by the cooperation work of the curved needle (16) and the looper (18). There is provided a rake stitch sewing machine which is characterized in that Further, whether the pair of feed dogs (51) and (52) can be operated integrally by closely contacting the head (50), respectively. No head part (58), and further fabric pressing members (83), (84)
Have different lengths and widths. In addition, the curved needle (1
6) It is easy to control the thread pull-out when the sewing thread is supplied to the sewing thread, which is useful for constructing a beautiful seam without puckering.

[0004]

The feed dog mechanism of the present invention is a device that enables three-point feed, and since it has a pair of large and small presser mechanisms that are arranged on the lower surface to press the cloth from below, the cloth is a presser mechanism and a feed dog. Will be fed smoothly. Further, the sewing thread sent to the curved needle 16 via the thread stand bar 25 is adjusted in thread tightening by the automatic sewing thread control device 24. Therefore, the pressing force between the thread tension discs corresponding to the operation of the curved needle 16 is adjusted. The thread is easily and smoothly pulled out.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the rake stitch sewing machine according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a needle plate assembly 54 according to the present invention, in which three long grooves 56, 60, 61 are provided. The presser foot set 55 is attached to the end of the long groove 60. Figure 2
Is a pair of presser foots arranged in parallel below the needle plate assembly 54,
One cloth presser 84 has a large length and a large width, and the other cloth presser 8
3 is smaller in width and length than the cloth presser 84, and forms the streak-like groove 82 on the upper surface. Next, the feed dog according to the present invention,
As shown in FIG. 3, the second long leg, each with a head 50,
Consists of a feed dog 52 and a short leg bifurcated first feed tooth 51,
A tooth portion 62 is formed at the end of the second feed dog 52, and bifurcated tooth portions 57 and 59 are formed at the first feed tooth 51. In actual use, the head 50 can be used in the state shown in FIG. 4 by closely adhering the head 50, or as shown in FIG. The first feed dog and the second feed tooth may be completely integrated with each other by forming a portion extending from the head portion 58 on the leg portion 63. The tooth portions 62, 57, 59 of the feed dog configured as described above are inserted into the corresponding grooves from positions facing the long grooves 61, 60, 56 provided in the needle plate set 54 shown in FIG. In accordance with the operation, it moves in the long grooves 61, 60, and 56 in four movements, and stitches are formed on the cloth fed to the upper surfaces of the large and small pressers 84 and 82 by the cooperation of the curved needle 16 and the looper 18. In response, the fabric is sent forward. Since the feed dog mechanism of this application has three tooth portions and enables a so-called three-point feed action, it is possible to sew a festival from the end of the fabric, and in addition to this, by the action of the sewing thread automatic control device, Since it is possible to control the tension of the sewing thread supplied to the needle, it is possible to smoothly perform festival sewing even at a place where the fabric overlaps and a step is formed. Therefore, it exerts a powerful effect on the curtain festival and the home sewing.

[0006]

The feed dog device of the present invention is capable of three-point feed dog action and employs the automatic sewing thread control device for controlling the supply of the sewing thread to the needle. It is possible, and even in the state where the steps are formed by overlapping the fabrics, there is an effect that smooth festival stitching can be performed and puckering can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of a needle plate assembly according to the present invention.

FIG. 2 is a perspective view of a pair of presser foots according to the present invention.

FIG. 3 is a perspective view of a feed dog according to the present invention.

FIG. 4 is a perspective view showing a usage state of the feed dog of FIG.

FIG. 5 is a perspective view of another example of the feed dog according to the present invention.

FIG. 6 is a perspective view of a conventional rake stitch sewing machine before incorporating the presser foot and the feed dog of the present invention.

FIG. 7 is a perspective view of a throat plate assembly and a presser foot assembly.

FIG. 8 is an enlarged exploded perspective view of a conventional feed dog.

FIG. 9 is an enlarged exploded perspective view of a curved needle.

FIG. 10 is an enlarged exploded perspective view of the looper.

FIG. 11 is an enlarged exploded perspective view of a conventional presser foot.

[Explanation of symbols]

 16 curved needle 18 looper 24 automatic sewing thread control device 50 head 51 first feed tooth 52 second feed tooth 53 long groove 54 needle plate assembly 56 long groove 57 tooth portion 58 head portion 59 tooth portion 60 long groove 61 long groove 62 tooth portion 83 cloth retainer (Small) 84 Presser foot (Large)

Claims (6)

[Claims] 1. A curved needle, a looper, a feed dog, attached to a needle plate,
In a rake stitch sewing machine that adopts a cloth presser or the like to form a rake stitch on fabric, a plurality of long grooves are bored in parallel in a needle plate, and a pair of pressers are arranged below these grooves. The pair of first feed dogs and the tooth portions of the second feed dog device are respectively inserted into the inside, and the cloth disposed on the pair of presser upper surfaces provided below the groove is fed forward to cooperate with the curved needle and the looper. The rake stitch sewing machine is characterized by forming a smooth rake stitch. 2. The rake stitch sewing machine according to claim 1, wherein the feed dog device is configured so that it can be fed at three points. 3. One of the pair of feed dogs engages with a long groove formed near the front end of the needle plate, and the other feed tooth engages with a pair of long groove formed in parallel with the rear of the needle plate. The rake stitch sewing machine described. 4. The rake stitch sewing machine according to claim 1, wherein the presser foot disposed below the needle plate is composed of two large and small pressers, and the presser foot has a feed groove formed on the upper surface of one of the small presser feet. 5. The sewing machine according to claim 2, wherein the heads of the pair of feed dogs are integrally formed. 6. The method according to claim 1, 2, 3, 4, or 5,
A sewing thread automatic control device is provided on the sewing machine head to control the pressure of the sewing thread passing through the thread tension disc by pressing the elastic member to easily control the thread pull-out when supplying the sewing thread to the curved needle. A sewn sewing machine.