JP4243333B2 - Sewing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sewing method for a sewing machine.
[0002]
[Prior art]
In the conventional sewing machine 50, when starting sewing as shown in FIG. 8, first, the upper thread held by the upper thread holding device 51 via the needle hole 54a of the needle 54 as shown by a two-dot chain line in FIG. In order to lock the sewing start side 52a of the workpiece 52 to the work cloth W, the upper thread 52 penetrates the work cloth W up and down with the first stitches and hangs down on the lower surface side of the work cloth W. In the state where the sewing start side 52a of the upper thread 52 is locked to the work cloth W in this way, the upper thread 52 and the lower thread 53 supplied from the hook 55 are entangled with each other after the second stitch, and the seam is formed. Try to form.
[0003]
[Problems to be solved by the invention]
However, since the sewing start side 52a of the upper thread 52 remains long on the lower surface side of the work cloth W, the upper thread 52 remaining on the lower surface of the work cloth W, for example, when the lower surface of the work cloth W is exposed to the outside. When the sewing start side 52a is a thin work cloth W that can be seen through from the upper surface side of the work cloth W, there is a problem that the appearance is deteriorated. In order to cope with this problem, if the sewing start side 52a of the upper thread 52 that remains long after the sewing process is manually trimmed shortly, there is a problem that the work is time-consuming and costly.
[0004]
An object of the present invention is to solve the above problems and to provide a sewing method that can shorten the length of the upper thread that hangs down from the lower surface of the work cloth on the sewing start side.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the sewing processing method of the present invention includes a first stage in which the upper thread penetrates the work cloth at the needle dropping position, and the sewing start side of the upper thread hangs down to the lower surface side of the work cloth. to form a seam formed by the needle thread and bobbin thread entangled with at least two places of work cloth, wherein the at least two places, of the upper yarn moving the respective locations immediately below the needle sewing start side of the needle plate The upper thread is moved by moving the needle drop position in the second stage set within a range not to come out of the needle hole and the first stage not located directly below the needle to the position just below the needle thread. sewing start side, from as hanging downward from the needle hole in longer the needle plate as compared with the case of not the mobile, a third step of cutting the sewing start side of the upper thread below said needle plate, A fourth stage for forming a seam following the seam of the second stage It contains.
[0006]
In the second stage, the place where the upper thread and the lower thread are entangled is not particularly limited, but the sewing start side of the upper thread that hangs down from the lower surface of the work cloth even if each part is moved directly below the needle is the needle. It is preferably set within a range that does not come out of the needle hole of the plate.
[0007]
During the third stage, the operation for forming the seam is stopped so that the operation for forming the seam does not interfere with the operation for cutting the sewing start side of the upper thread. Examples of such an embodiment can be illustrated. “Stopping the operation for forming the seam” is not particularly limited, but can be exemplified as follows.
(1) A mode in which a cancel mechanism provided in a needle bar drive mechanism of the sewing machine is operated to temporarily stop the vertical movement of the needle bar.
(2) A mode in which the motor that drives the needle bar drive mechanism of the sewing machine is stopped.
[0008]
In addition, during the third stage, the operation for forming the seam is slowed so that the operation for forming the seam does not interfere with the operation for cutting the sewing start side of the upper thread. Examples of such an embodiment can be exemplified. In addition, the operation for forming the seam may be delayed during the first stage and the second stage.
[0009]
Moreover, although the said 3rd stage is not specifically limited, The following aspect can be illustrated.
(1) A mode in which only the sewing start side of the upper thread hanging from the lower surface of the work cloth is cut .
(2) A mode in which the sewing end side of the lower thread hanging from the lower surface of the work cloth is cut simultaneously with cutting the sewing start side of the upper thread, and at this time, the sewing end side of the upper thread is not cut.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 to 7 show a sewing method according to an embodiment of the present invention. First, the sewing machine 1 used in this method will be described. The sewing machine 1 is provided on a sewing head (not shown) and driven up and down, and is moved horizontally on a table (not shown) below the needle 2. A sewing frame 4, a needle plate 5 provided substantially flush with the table surface and provided with a needle hole 5 a through which the needle 2 is inserted, and a lower thread 11 provided on the lower side of the needle plate 5. And a hook 6 incorporating a bobbin (not shown). The upper thread 10 and the lower thread 11 are entangled with the work cloth W that is stretched around the sewing frame 4 and horizontally moved, by the cooperation of the needle 2 and the shuttle 6, thereby forming a seam. Further, a thread cutting device 8 for cutting the upper thread 10 and the lower thread 11 is provided in the vicinity of the hook 6.
[0011]
The yarn cutting device 8 includes a fixed blade 17 whose position is fixed and a movable blade 19 that is rotatably provided. Then, when the movable blade 19 is rotated, the movable blade 19 hooks the upper thread 10 and the lower thread 11 and draws them to the fixed blade 17, and the thread 10 is aligned with the blade of the fixed blade 17 and the blade of the movable blade 19. , 11 are cut off.
[0012]
The control system of the sewing machine 1 will be described. As shown in FIG. 2, the control device 21 of the sewing machine 1 includes a CPU, a read-only memory, a readable / writable memory, an external storage device, and the like (all not shown). . Then, the operation of the sewing machine 1 is controlled based on a sewing method described later. The control device 21 includes an operation panel 22 for an operator to input a driving instruction via an interface and a driver (both not shown), and a spindle motor 23 for driving the needle 2 and the shuttle 6, respectively. A needle bar drive mechanism 24 that moves the needle 2 up and down via a needle bar (not shown) by the drive force of the spindle motor 23, and in the needle bar drive mechanism 24, the drive force of the spindle motor 23 is changed to the needle bar. A cancel mechanism 25 for preventing transmission to the needle, an upper thread holding device 26 for holding the upper thread on the needle 2 side cut by the thread cutting device 8, the thread cutting device 8, and the sewing frame 4 for moving horizontally. The frame drive mechanism 27 and the like are connected.
[0013]
Next, the sewing method of the present invention will be specifically described in detail. Before starting the sewing process, as shown in FIG. 1, the needle 2 is at the top dead center position, and the upper thread 10 is held by the upper thread holding device 26 via the needle hole 2a of the needle 2. Shall.
[0014]
[the first stage]
The work cloth W is vertically penetrated by lowering the needle 2 to the bottom dead center position. At this time, at the lower side of the work cloth W, when the needle 2 is slightly raised from the bottom dead center, the sword tip 6a of the hook 6 hooks the upper thread 10 at the tip of the needle 2, and when the needle 2 is lifted, the upper thread holding device 26 The upper thread 10 is pulled out and pulled out to the lower surface side of the work cloth W. When the needle 2 rises again to the top dead center position, the upper thread 10 penetrates the work cloth W as shown in FIG. 3, and the sewing start side 10a of the upper thread 10 hangs down to the lower surface side of the work cloth W. It becomes a state. In this first stage, the upper thread 10 is locked to the work cloth W by passing the sewing start side 10a of the upper thread 10 into the needle drop position of the work cloth W in this way.
[0015]
[Second stage]
By moving the sewing frame 4 by the frame drive mechanism 27, the next needle drop position of the work cloth W is moved directly below the needle 2, and the needle 2 at the top dead center is moved to the bottom dead center at the needle drop position. 1 reciprocating motion. Then, the upper thread 10 and the lower thread 11 are entangled at one place 30 of the work cloth W as shown in FIG. Similarly, the upper thread and the lower thread are entangled at another needle dropping position of the work cloth W as shown in FIG. In this way, a stitch formed by entwining the upper thread 10 and the lower thread 11 at the two locations 30 and 30 of the work cloth W is formed.
[0016]
These two locations 30 and 30 are such that even if each location is moved directly below the needle 2, the sewing start side 10 a of the upper thread 10 hanging from the lower surface of the work cloth W does not come out of the needle hole 5 a of the needle plate 5. It is set within the range.
[0017]
[Third stage]
By operating the cancel mechanism 25 to a cancel state, the vertical movement of the needle 2 is stopped and the operation for forming the seam is stopped. At this time, the rotation of the spindle motor 23 is not stopped. Then, the yarn cutting device 8 is operated as shown by a two-dot chain line in FIG. Then, together with the sewing start side 10a of the upper thread 10 hanging from the lower surface of the work cloth W, the sewing end side 11a of the lower thread 11 hanging from the lower surface of the work cloth W is hooked on the movable blade 19 of the thread cutting device 8 and fixed. By matching the blades of the blade 17 and the movable blade 19, the two threads 10, 11 are cut on the lower surface side of the work cloth W as shown in FIG. 6 (the sewing end side 10b of the upper thread 10 is not cut). ), The length on the sewing start side of the upper thread 10 that hangs down from the lower surface of the work cloth W is shortened.
[0018]
Note that the lower thread 11 on the side of the work cloth W after being cut is entangled with the upper thread at two locations 30 and 30 and therefore cannot be easily unwound. Further, since the sewing end side 10b of the upper thread 10 is not cut, the appearance of the surface of the work cloth W does not deteriorate.
[0019]
In this stage, when the needle drop position in the first stage is not located directly below the needle 2 as in the present embodiment, the frame drive mechanism 27 is operated, and the needle drop position is set to the position of the needle 2. It can also be moved directly below. In this way, the sewing start side 10a of the upper thread 10 is longer and hangs downward from the needle hole 5a of the needle plate 5, so that the sewing start side 10a of the upper thread 10 can be cut longer.
[0020]
[Fourth stage]
By operating the cancel mechanism 25 and releasing the cancel state, the vertical movement of the needle 2 is resumed. Then, as shown in FIG. 7, at each needle drop position following the last needle drop position in the second stage, the upper thread 10 and the lower thread 11 are entangled, and a seam is formed.
[0021]
According to the sewing method configured as described above, the length of the sewing start side 10a of the upper thread 10 hanging from the lower surface of the work cloth W can be shortened. For this reason, unlike the prior art, the sewing start side 10a of the upper thread 10 does not remain long on the lower surface of the work cloth W, and the sewing start side 10a of the upper thread 10 does not need to be cut short by hand.
[0022]
In addition, this invention is not limited to the structure of the said embodiment, For example, it can also be suitably changed and embodied in the range which does not deviate from the meaning of invention as follows.
(1) In the second stage, the upper thread 10 and the lower thread 11 are entangled at three or more locations on the work cloth W.
(2) In the third stage, the thread cutting device 8 is configured to cut only the sewing start side 10a of the upper thread 10 hanging from the lower surface of the work cloth W (the lower thread 11 is not cut).
[0023]
(3) In the third stage, instead of operating the cancel mechanism 25, the operation for forming the seam is stopped by stopping the spindle motor 23.
(4) During the third stage, instead of stopping the operation for forming the seam, the operation for forming the seam is delayed. In addition, the operation for forming the seam may be delayed during the first stage and the second stage.
[0024]
【The invention's effect】
As described above in detail, according to the sewing processing method according to the first and second aspects of the invention, there is an excellent effect that the length of the upper thread that hangs down from the lower surface of the work cloth can be shortened. .
[Brief description of the drawings]
FIG. 1 is a block diagram showing a control system of a sewing machine that executes a sewing method according to an embodiment of the present invention.
FIG. 2 is a front sectional view of the sewing machine showing a state before starting the sewing method.
FIG. 3 is a front view showing one state of the sewing machine in a first stage of the sewing method.
FIG. 4 is a front view showing one state of the sewing machine in a second stage of the sewing method.
FIG. 5 is a front view showing the state of the sewing machine from the second stage to the third stage of the sewing method.
FIG. 6 is a front view showing one state of the sewing machine in a third stage of the sewing method.
FIG. 7 is a front view showing one state of the sewing machine in a fourth stage of the sewing method.
FIG. 8 is a front sectional view of an embroidery sewing machine showing a conventional sewing method.
[Explanation of symbols]
1 Sewing machine 8 Thread cutting device 10 Upper thread 10a Upper thread sewing side 11 Lower thread 30 Location where upper thread and lower thread are entangled

Claims (3)

Through the needle thread (10) of the fabric with a needle drop position (W), a first stage sewing start side of the upper thread (10a) is to hang on the lower surface side of the workpiece cloth (W),
A seam (30) is formed by entwining the upper thread (10) and the lower thread (11) at at least two positions on the work cloth (W), and the at least two positions are located immediately below the needle (2). A second stage set within a range such that the sewing start side (10a) of the upper thread does not come out of the needle hole (5a) of the needle plate (5) even if it moves .
Compared with the case where the sewing start side (10a) of the upper thread is not moved by moving the needle drop position in the first stage, which is not located directly below the needle (2), directly below the needle (2). from hand longer the needle plate (5) needle hole (5a) from as hanging downward, and a third step of cutting the upper thread sewing start side of (10a) below said needle plate (5) ,
And a fourth stage for forming a seam (30) following the second stage seam (30). During the third stage, by operating a cancel mechanism (25) provided in the needle bar drive mechanism (24) of the sewing machine (1) and temporarily stopping the needle bar from moving up and down, the stitches (30 The sewing processing method according to claim 1, wherein an operation for forming a) is stopped. In the third stage, the sewing start side (10a) of the upper thread is cut and simultaneously the sewing end side (11a) of the lower thread (11) hanging from the lower surface of the work cloth (W) is cut. The sewing method according to claim 1 or 2, wherein the sewing end side (10b) of the thread (10) is not cut.

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