JPH02193692A - Button sewing machine - Google Patents

Abstract

PURPOSE:To prevent fraying and the floating of a seam at both the end edge and the start edge of a button thread and to obtain an excellent button sewed up state by forming nodes under a state in which the nodes are arranged obliquely for the rotating direction of a rotating hook by the carrying operation of a processed material carrying means and forming the nodes for fixing sewing with a hitch stitch. CONSTITUTION:When the tenth stitch and the eleventh stitch are to be stitched, a button holding member 1 respectively moves cloth W and a button B in an obliquely downward direction, and nodes P10 and P11 are formed. Thus, nodes P9, P10, and P11 are formed under an arraying state in the same buttonhole H1, and the P10 and P11 are formed with the hitch stitch like the second stitch and the third stitch. Since the first, second, and third stitches and the ninth, tenth, and eleventh stitches are formed in the same buttonhole H1, and the nodes of the second and third stitches and the nodes of the tenth and eleventh stitches are formed with the hitch stitch in a sewing up operation composed of eleven stitches in total in the above-mentioned manner, the fear of the occurrence of the coming off of the button, etc., caused by the fraying of the button thread can be eliminated, and excellent sewed up strength can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a button sewing machine that performs a lockstitch operation on a pair of buttonholes to sew a button.

[Conventional technology]

A button sewing machine that performs a lockstitch operation has a sewing needle that moves vertically, moves the button and fabric horizontally, and processes the sewing needle alternately into a pair of buttonholes. It is known to form a thread and sew it on. Button sewing machines that use this lockstitch operation are said to have relatively high sewing strength because they use two threads, the upper and lower threads. Lower the suture needle completely alternately into the pair of buttonholes,
In this case, in a total of nine sewing operations, stitches 1, 3, 5, and 7.9 are sewn into one button hole, and stitches 2, 4, and 6.8 are sewn into the other button hole. When sewing is carried out by sewing the buttons into the buttonholes of the clothing, there is a problem in terms of the sewing strength in that the starting and sewing ends of the sewing thread tend to fray when the button is removed from the clothing.

Therefore, in order to improve the sewing strength, a sewing machine has been proposed which performs a needle movement operation as shown in FIG. That is,
After moving the first needle to the first button H1 (see Figure 6) and the second needle to the second buttonhole H2, move the third needle slightly closer to the second needle in the X direction (to the right in the figure). Then, perform the 4th to 7th stitches alternately for both buttonholes H1 and H2.Move the 3rd and 8th needles (last needles) slightly in the X direction and insert them into the same buttonhole H□. It is supposed to form.

In addition, in FIG. 7, P1 to P indicate node points formed by the first to eighth needles.

As mentioned above, by moving the 3rd and 8th needles in the It is designed to prevent fraying.

[Problem that the invention aims to solve]

However, although it is possible to prevent the sewing thread from fraying to some extent with the button sewing machine that performs the sewing operation described above, it is possible to prevent the fraying of the sewing thread to some extent. Since the third needle is inserted into a different buttonhole from the first needle, there is a problem in that fraying at the node P formed by the first needle is likely to occur. In other words, the first needle is closest to the free end of the thread, and the knot point is likely to be a part-eft stitch, so it is naturally prone to fraying, but as mentioned above, the first needle and the node point P1 of the second needle. P2 is different from buttonhole H1 and H
2, both nodes P construction.

A crossover thread IC is formed between P2, and since this crossover thread IC is pulled together with the button B when the button B is hung or unhooked, fraying of the first needle and lifting of the seam are likely to occur. Such fraying of button threads and floating seams appear on the surface of the buttons, which significantly impairs the appearance and leads to deterioration of quality.

This invention was made in view of the above-mentioned problems, and it is possible to prevent fraying and floating of the seam at both the terminal end and the beginning end of the button thread, and to obtain an excellent button sewing condition. The purpose is to provide sewing machines.

[Means to solve the problem]

The present invention provides a button sewing machine in which a knotting point is formed in a pair of opposing buttonholes by a sewing thread knotting means and a workpiece conveying means, and a stitch is formed across each buttonhole. At the same time, knot points for tacking stitches formed by a plurality of subsequent needles and a plurality of needles before the terminal needle are formed in the same buttonhole.

The knotting points for tacking stitches are arranged diagonally with respect to the rotational direction of the outer hook by the conveying operation of the workpiece conveying means, and the knotting points for Rakuhoku tacking stitches are formed in pitch stitches. be.

[For production]

According to this invention, the knot points of the plurality of stitches after the first needle and the plurality of stitches before the final needle are continuously formed in the same buttonhole,
The stitch formed between the knotting point of the first needle and the knotting point of the second needle does not become a crossing thread. Therefore, when unhooking a button, the force applied to the crossover thread is not directly applied to the knot of the first stitch. The incidence of fraying decreases as the axis increases. Also.

Even if fraying occurs on the first needle, the length of the frayed button thread from the first needle to the second needle is extremely short, so it hardly poses a problem in terms of quality.

Since the tie-stitch knot points formed in the same buttonhole are arranged diagonally with respect to the rotational direction of the outer hook, these are reliably hit-stitched.

Therefore, good sewing strength can always be obtained.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In the figure, reference numeral 1 denotes a button holding member as workpiece moving means comprising a holding member main body a and a pair of button holding legs 1b, lc etc. provided on the holding member main body a so as to be openable and closable. This button holding member 1 is designed to hold the outer periphery of the button B with the button holding feet 1b and 1c, and to hold and fix the cloth using the holding feet 1b, lc and the movable plate 2. Also.

The button holding member 1 and the moving plate 2 are moved horizontally on the throat plate 3 in the x'-X direction and the Y'-Y direction by a driving means not shown, so that the button B and the cloth W are moved integrally. It has become.

Further, 4 is a well-known lockstitch sewing machine hook provided on the lower surface of the throat plate 3, 4a is an inner hook that holds a bobbin case 4b containing a bobbin thread bobbin, and 4c is synchronized with the raising and lowering of the suture needle 5. 4cm indicates the tip formed on the outer hook 4C. In addition, this sewing machine hook 4
and the suture needle 5 constitute a sewing thread tying means for tying the upper thread I and the lower thread 2.

In the button sewing machine described above, when the button sewing operation start switch is turned ON, the button holding member 1 horizontally moves the button B and the cloth W in synchronization with the raising and lowering of the suture needle 5, and the fourth
The hand movement operation shown in the figure is performed.

That is, when the first needle is inserted into the first buttonhole king (,) and the first node P1 is formed, the button holding member 1 and the movable plate 2 are moved by an unillustrated immediate action means to apply an X' force. Direction Y
The button B and cloth W are both moved diagonally downward to the right in Fig. 4 (approximately 0°2 [1111)], and the second
Do the needle. As a result, a second knot point P2 is also formed in the fabric in the first buttonhole F11, but when this knot point P2 is formed, the condition of the needle thread 11 I2 becomes as shown in FIG. 3. In other words.

Due to the diagonal movement of the workpieces W and H, the thread limb Ia from which the needle thread I The node point P2 formed by two stitches is definitely a pitch stitch. Then the third
As for the needles, the third stitch is performed by moving the cloth W and the button B diagonally downward to the right in FIG. Therefore, the third node P also becomes a hit stitch.

Note that the workpiece should not be placed diagonally downward to the right as described above, but to the right (
Although it is theoretically possible to form a hit stitch even by moving in the X' force direction, in reality, a pitch stitch may not be formed depending on the type of thread, etc., and it is uncertain. However, it has been experimentally shown that when the workpiece is moved diagonally downward to the right, as in this example, the probability of stitching is significantly increased compared to when the workpiece is moved to the right. Ta.

After the third stitch, in the fourth to ninth stitches, the button holding member 1 moves the button B and the cloth W to the left and right (X' force direction and X direction) to make each buttonhole H.

Nodal points (P4 to P9) are formed alternately on H2. Thereby, six crossover threads IC are formed between both buttonholes H1 and H. And after the formation of the 9th needle node. When performing the 10th stitch and the 11th stitch (last stitch), the button holding member 1 moves the cloth W and the button B obliquely downward in FIG. 4 to form a node point P 1 D t P 11. Due to this, the node P,.

P, .

As described above, in this embodiment, during the sewing operation of all 11 stitches, the 1st, 2.3rd and 9th, 10th, and 11th stitches are formed in the same buttonhole H□, and the second and third stitches are Since the knots of the needle and the to and 11th stitches are pitch stitched, there is no risk of the button falling off due to fraying of the button thread.
Excellent sewing strength can be obtained. In addition, as is well known, the first needle is unlikely to become a hit stitch, and since it is located closest to the free end of the thread, the knot point P1 itself is prone to fraying. The example and the prior art described above are similar, but in this example, since no crossing thread is formed between the second needle and the node P2, when unhooking a button from the garment, it is necessary to Even if the force is applied to the crossing thread IC of the book, the force is not directly applied to the first node P, so the incidence of fraying at the node P1 is significantly reduced compared to the prior art. In addition, for some reason, if the first node P□
Even if it becomes frayed, the length of the frayed thread is extremely short, reaching the second node P2, so there is no risk of deterioration of the appearance or deterioration of the quality of the product.

In the above embodiment, the sewing operation using a total of 11 stitches was explained as an example, but the present invention is not limited to the above embodiment, and can also be applied to sewing operations using other numbers of stitches. It is applicable, and furthermore, the number of stop knot points to be formed at the beginning and end of sewing is not limited to three, but may be any other number as long as it is plural.

It is possible to prevent fraying and floating of the seams, and to obtain an excellent button sewing condition.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a button holding member according to an embodiment of the present invention, FIG. 2 is a partially vertical front view of the same embodiment, FIG. 3 is a right side view of the button holding member shown in FIG. 2, and FIG. Fig. 5 is an explanatory plan view showing the state of needle movement in the same embodiment, Fig. 5 is an explanatory plan view showing the state of needle thread on the 2nd, 3rd, 10° and 11th stitches in the same embodiment, Fig. 6 is the state of needle movement in the button sewing machine. FIG. ■... Button holding member (workpiece conveyance means) [Effects of the invention] As explained above, according to the button sewing machine according to the present invention, knots are formed by the plurality of stitches before the first needle and the plurality of stitches before the last needle. Since the dots are formed using hitch stitches to the same button holes, the buttons can be sewn securely, and the first needle 4c...outer hook 5...needle P work~P, 1...・Node point

Claims (1)

[Scope of Claims] Sewing thread tying means for tying the upper thread and lower thread by moving the suture needle up and down and rotating the outer hook, and horizontally moving the button and the cloth in synchronization with the sewing thread tying means. A button-making sewing machine is provided with a workpiece conveying means, in which a knot is formed in at least one pair of buttonholes, and a stitch is formed across each buttonhole. The tie-stitch knots formed by the previous multiple needles are formed in the same buttonhole, and the knots are arranged diagonally with respect to the rotating direction of the outer hook by the conveying operation of the workpiece conveying means. A button sewing machine characterized in that the knot points for securing stitches are formed by hitch stitches.