JPH0335270Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> This invention relates to an eight-stitch device that prevents excess over the buttons on the front body of a suit.

<Prior art and its problems> Conventionally, when sewing a suit, eight stitches have been applied to the outer material and interlining material of the collar. There was a time when this eight-stitch work was done by hand, but these days all eight-stitch sewing machines are used.

By the way, an eight-stitch sewing machine that has been commonly used in the past is as shown in FIG. 2, for example. That is, by arranging a cloth lifting plate c fixed to the piston rod b of the cylinder a and a presser foot f at the tip of a presser foot arm e connected to the piston rod b and elastically connected by a spring d. It was configured. And this presser foot f
Above the feed dog g and eight needles h are present.
When making eight stitches using this eight-stitch sewing machine, the fabric is set so that the outer material is on the side of the presser foot f and the interlining is on the side of the feed dog g.
Since the outer fabric is in contact with the fabric raising plate c during its progress, it cannot be denied that it tends to lag behind the interlining that is fed by the feed dog g.
Therefore, there is no particular problem when making eight stitches from the bottom to the top of the collar, but when doing the opposite, that is, eight stitches from the top to the bottom of the collar, there is excess or sagging on the buttons on the front body. This resulted in a very unsightly appearance. In order to prevent this kind of excess from forming on the button, the key is to advance the outer fabric even slightly faster than the interlining, but with the conventional device described above, the opposite is true. The trend was strong.

Furthermore, in a sewing machine that sews two overlapping pieces of fabric, a sewing machine that can feed these two pieces of fabric by means of two upper and lower rollers is also disclosed, for example, in Japanese Patent Laid-Open No. 61-255687. Exist as it is. However, in this publication, the two rollers for feeding the two fabrics rotate at the same speed, and as a result, the two fabrics travel at the same speed at the same time. Therefore, if the technology shown in this publication is used as it is in the eight stitching device, it will not be possible to maintain the folded state peculiar to the collar of a suit when making eight stitches on the collar of a suit. It cannot be used for eight stab devices.

<Means for solving the problems> Therefore, in order to solve the above-mentioned problems, the eight-stitching device according to the present invention has a presser foot in the eight-stitching device that can move up and down slightly forward in the fabric traveling direction, and can rotate on its own axis. In addition, we have installed an outer material feed roller that can feed the outer material that has overlapped with the interlining earlier than the interlining, and during the eight stitching process, the outer material is actively moved away from the interlining by the outer material feeding roller. Also, when making eight stitches from the top of the collar downwards, do not leave any excess on the button, and therefore make eight stitches from either the top or bottom of the collar. It was made so that it could be done.

<Embodiment> Next, an embodiment of the eight stitching device according to this invention will be described based on the drawings. 1 is a cloth raising plate connected to the tip of the piston rod 3 of the cylinder 2, and 4 is the cloth raising plate connected to the tip of the piston rod 3 of the cylinder 2. This is a presser arm rotatably connected to a part of the plate 1 via a spring 5. Reference numeral 6 denotes a presser metal rotatably disposed at the tip of the presser metal arm 4. Although not shown, a rail-shaped carriage is disposed on both sides of the cloth lifting plate 1 and the presser foot 6, and a feed dog 7 and an eight needle 8 are disposed above the carriage. The configuration described above is no different from the conventional eight-stitch sewing machine. Reference numeral 9 denotes an outer fabric feed roller disposed below the carriage and in front of the presser foot 6 in the fabric traveling direction. It rotates at a speed that allows it to be sent quickly. Two outer material feed rollers 9 are connected by a support shaft 10, and a bevel gear 11 is formed on one side of one of the outer material feed rollers 9, and another bevel gear 12 is meshed with this bevel gear 11. The latter bevel gear 12 is connected to a rotating shaft 15 which is connected to a motor 14 via a transmission 13. 16 is the outer fabric feed roller 9
17 is a cylinder connected to the support shaft 10 of the base plate 16. Therefore, the outer material feed roller 9 is configured to be able to move up and down as a whole. Further, the substrate 16 is connected to a part of the base 19 via a spring 18,
This spring 18 urges the substrate 16, outer material feed roller 9, etc. upward.

<Function> Then, the fabric for eight stitches is set on the carriage, that is, between the presser foot 6 and the feed dog 7. In this case, the outer material 20 is placed on the side of the presser foot 6, with the core The bases 21 are stacked and set so that they each face the feed dog 7 side. Then, when the feed dog 7 is activated, the feed dog 7 becomes
By repeating the movement of coming into contact with and separating from the interlining 21 along an elliptical trajectory, the interlining 21 is directly advanced, and the outer material 20, which has been pierced eight times and integrated in the previous stage, is advanced. . Also, in the process of advancing the outer material 20 and interlining 21 in this way, eight pricks are made by the eight-prick needle 8, but in this case, the piston rod 3 of the cylinder 2 is moved only when the eight-prick needle 8 performs the eight-prick action. In other words, the fabric raising plate 1 rises and partially pushes up the outer fabric 20 and the interlining 21, and the presser foot 6 is pressed against the spring 5 by the pressure of the feed dog 7.
As a result, the eight needles 8 are pierced at one point on the fabric. While repeating this, the interlining 21 side is advanced by the feed dog 7.

Also, in this process, the motor 14 is operated to rotate the substrate 16 via the transmission 13,
Then rotate the eight needles 8. In this case, the outer fabric feed roller 9 is set at a speed slightly higher than the speed of the interlining 21 fed by the feed dog 7. This outer fabric feed roller 9 is also moved up and down by a cylinder 17 and a spring 18, but this up and down movement is synchronized with the up and down movement of the cloth raising plate 1. Due to the above effects, the outer material 20 tends to feel slightly faster than the interlining 21.

<Effects of the invention> As described above, according to the eight-stitching device according to this invention, the presser foot in the eight-stitching device can move up and down slightly forward in the fabric traveling direction, rotate on its own axis, and overlap with the interlining. Since the outer fabric feed roller is installed to feed the outer fabric earlier than the interlining, the outer fabric is actively fed by the outer fabric feeding roller slightly earlier than the interlining during the eight stitching process. The effect is that even when making eight stitches from above the collar downwards, no surplus is generated on the button, and therefore it becomes possible to make eight stitches from either the top or bottom of the collar. It has the following.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the eight-jar device according to this invention, and FIG. 2 is a front view showing a conventional example. 1... Cloth raising board, 2, 17... Cylinder, 3
... Piston rod, 4 ... Presser arm,
5, 18... Spring, 6... Presser foot, 7...
... Feed dog, 8... Eight needles, 9... Outer material feed roller, 10... Support shaft, 11, 12... Bevel gear,
13...Transmission, 14...Motor, 15...Rotating shaft, 16...Substrate, 19...Base, 20...Outer material, 21...Interlining.

Claims (1)

[Scope of utility model registration request] An outer material feed roller is disposed slightly forward of the presser foot in the fabric traveling direction in the eight stitching device, and is movable up and down, rotates on its own axis, and can feed the outer material overlapped with the interlining earlier than the interlining. Eight stab device featuring.