JP4017914B2 - sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sewing machine, and more particularly to a sewing machine provided with a thread trimming control device.
[0002]
[Prior art]
Conventionally, when sewing is completed, thread trimming is performed on the upper thread and the lower thread. At the time of this thread trimming, the thread is held by the thread trimming scissors to prevent the thread from being caught or pulled out, and the thread trimming scissors are released only after the predetermined condition is satisfied, and the thread held by the scissors It is to be released.
[0003]
[Problems to be solved by the invention]
However, in the conventional sewing machine, the thread release timing is fixed, and depending on the sewing pattern, even if the thread release timing shifts and a predetermined amount of cloth moves, or the predetermined sewing length of the pattern ends. However, there is a problem that the thread trimming scissors remain held by the thread and the operation after thread trimming becomes incomplete.
[0004]
Accordingly, an object of the present invention is to solve such problems, and it is possible to easily set the timing for releasing the yarn held by the thread trimmer at the time of thread trimming, and at the set timing. To provide a sewing machine capable of reliably releasing a yarn.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a thread trimming scissors, a thread releasing means for releasing the thread held by the thread trimming scissors, and a sewing movement amount of the sewing product until the thread is released after the thread trimming. Setting means for setting, storage means for storing the setting value of the sewing movement amount, and when the setting value of the sewing movement amount is larger than the sewing length of the sewing pattern, the thread is released when the sewing length is sewn. The structure provided with the control means to be adopted is employ | adopted.
[0008]
In such a configuration, even if a set value larger than the sewing length is input, when the sewing length is sewn, the thread held by the thread trimmer is automatically released, allowing normal sewing. become.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
[0010]
FIG. 1 shows an embodiment of the sewing machine of the present invention, in particular, a buttonhole sewing machine. A presser (plate) 4 is attached to a support portion 2 of a sewing machine head 1 that supports a sewing needle 3. It has been. The sewing machine is provided with an operation panel (setting means) 10 that can perform various settings, and an electrical box 6 is attached to the lower part of the sewing machine. Further, a sewing machine starting pedal 8 used for starting the sewing machine is attached to the lower part of the sewing machine.
[0011]
As shown in FIG. 2, the electrical box 6 is provided with a CPU 20 as a control means. Various data necessary for sewing are input from the personal computer 24 to the CPU 20 and setting data set by the operation panel 10 is input. The CPU 20 receives a sewing machine starting signal from the sewing machine starting pedal 8.
[0012]
The CPU 20 also includes a ROM 21 that stores control programs, a RAM 22 that stores calculation data and is used as a work area, various programs such as a sewing program, a non-volatile storage that stores sewing data, sewing patterns, setting data, and the like necessary for sewing. A memory (storage means) 23 is connected.
[0013]
The CPU 20 rotates the spindle motor 26 via the control board 25 in response to the sewing machine starting signal from the sewing machine starting pedal 8, and based on the sewing data and setting data, the needle swing motor 27, the cloth feed motor 28, and the upper thread trimming motor 29 are rotated. Then, predetermined sewing is performed by operating various actuators such as the lower thread trimming motor 31, the presser foot lifting motor 33, the thread tension solenoid 34, and the female solenoid 35. The upper thread trimmer motor (yarn releasing means) 29 drives the upper thread trimmer scissors 30 to perform upper thread trimmer, and after the thread trimmer, releases the upper thread trimmer scissors to release the thread held by the scissors. . The lower thread trimming motor (yarn releasing means) 31 drives the lower thread trimming scissors 32 to perform lower thread trimming, and also releases the lower thread trimming scissors to release the thread held by the scissors.
[0014]
FIG. 3 shows the appearance of the operation panel 10. When the pattern number key 10a is pressed, the pattern number is displayed on the screen 11, and when the data display key 10b is pressed, a buttonhole sewing pattern (hereinafter simply referred to as a sewing pattern) corresponding to the number is displayed on the screen 11. The pattern number can be increased / decreased with the increase / decrease key 10d, and the sewing pattern corresponding to the increased / decreased number can be displayed on the screen 11. When the mode key 10c is operated, the setting mode is set, and various setting modes can be shifted by the increase / decrease key 10d. The key 10e is an addition / subtraction key for adding or subtracting various data values, and the key 10f is various parameters (cloth cutting length, clamping length, etc.) of the sewing pattern displayed on the screen in the edit mode. When one of the keys is pressed, the parameter value is displayed on the screen and can be changed with the addition / subtraction key 10e. The ready key 10g is a key for confirming the set data. When this key is operated, the setting mode can be automatically exited.
[0015]
In the present invention, it is possible to set the sewing movement amount of the sewn product until the thread held by the thread trimming scissors is released after the thread trimming is performed. This setting is performed by pressing the mode key 10c and using the increase / decrease key 10d to set the upper thread trimming setting screen as shown in the screen 11 of FIG. On the upper thread trimming setting screen, the symbol 11a indicating the upper thread trimming setting and its set value 11b are displayed, so that the thread held in the upper thread trimming scissors 30 is released using the addition / subtraction key 10e. Change the setting value of the sewing movement amount until the sewing is completed. In the lower thread trimming setting screen shown in FIG. 3 (B), a pattern 11c indicating the lower thread trimming setting and its set value 11d are shown. Similarly, using the addition / subtraction key 10e, the lower thread trimming scissors The set value of the sewing movement amount of the sewing product until the thread held at 32 is released can be changed. These set values of the sewing movement amount can be individually stored in the nonvolatile memory 23 as upper thread trimming and lower thread trimming setting values by operating the post-setting preparation completion key 10g.
[0016]
FIG. 4 shows a case in which buttonhole sewing as shown in FIG. 5 is performed, and sewing is performed on the basis of the set value of the sewing movement amount (thread release setting value) until the thread release set as described above. The flow when performing is shown. In this example, the upper thread will be described, but the same flow applies to the lower thread.
[0017]
First, sewing of the selected hole stitching pattern is started (step S1). At this time, it is assumed that the thread trimming is performed as a previous stage, and the upper thread trimming scissors 30 are not yet opened and hold the thread. Accordingly, the flag F indicating the yarn release is set to zero. In step S1, the value Z of the sewing movement amount of the sewing product (cloth) is set to zero.
[0018]
As the sewing progresses and the cloth feed advances, the sewing movement amount Z is calculated (step S2). The movement amount Z can be obtained by accumulating the pitch for each stitch since the pitch in the cloth feeding direction for each stitch can be known from the sewing data.
[0019]
In a succeeding step S3, it is determined whether or not the cloth sewing movement amount Z has reached the thread release setting value S. If not reached, the process proceeds to step S6 and sewing is continued until the sewing length is reached. On the other hand, as shown in FIG. 5 (A), the sewing corresponding to the total length of the lower latching portion 40a, the left parallel portion 40b (right parallel portion 40d), and the upper latching portion 40c of the overlock stitching portion 40. If the sewing movement amount Z reaches the thread release set value S before reaching the length L (YES in step S3), if the flag F is zero and the thread is not released (YES in step S4), Under the control of the CPU 20, the upper thread trimming motor 29 is driven to open the upper thread trimming scissors 30 and release the thread. At this time, the flag F is set to 1 (step S5). Once the flag F is reached, the determination is NO in step S4, and the process proceeds to step S6. Therefore, the cloth feed is performed until the sewing length L is reached, and the sewing is performed up to the upper latch stopper 40c.
[0020]
On the other hand, as shown in FIG. 5B, when the thread release set value S is larger than the sewing length L, F is not set to 1, so the determination in step S7 is affirmed and the step In S8, the upper thread trimming scissors are released and the upper thread is released. Thereby, when the sewing of the upper hook stopper 40c is completed and the sewing length L is sewn, the thread is automatically released. The flag F is set to 1 by this yarn release.
[0021]
In addition, when the moving direction of the sewing product is changed, if the thread is not yet released, the thread is released for certainty. Therefore, it is determined whether or not the moving direction has changed in step S9. As shown in FIG. 5 (C), when sewing is performed from the upper hook and loop portion 40c to the right parallel portion 40d, the feeding direction changes downward at the position P, so that the thread is released at this point. (Step S10).
[0022]
In this way, when it is determined that the sewing is continued and the remaining sewing is finished (YES in step S11), thread trimming is performed (step S12), and the sewing is finished.
[0023]
In the embodiment described above, the sewing machine is a sewing machine such as a buttonhole, but the sewing machine can also be applied to an embroidery sewing machine that can transfer a sewing product in the X direction and the Y direction. In this case, the movement amount of the cloth in the Y direction is the sewing movement amount. Further, even when control is performed such that movement is performed in the X direction and the Y direction for each stitch without performing sewing, the present invention can be applied with the pitch integrated amount in the Y direction corresponding to the number of stitches as the amount of movement. it can. In this case, the same operation can be performed not only in the normal sewing mode but also in the mode in which the presser foot is lifted, and the interference between the presser and the scissors can be prevented and the timing of thread release can be confirmed. it can.
[0024]
【The invention's effect】
As described above, in the present invention, even if a set value larger than the sewing length is input, the thread is automatically released when the sewing length is sewn, so that normal sewing is possible.
[0026]
Further, since the thread release setting value can be set individually for the upper thread trimming and the lower thread trimming, independent thread releasing operations can be performed by the upper and lower thread trimming.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing the appearance of a sewing machine according to the present invention.
FIG. 2 is a block diagram showing a configuration of a sewing machine control system.
FIG. 3 is an explanatory diagram showing a key arrangement of an operation panel.
FIG. 4 is a flowchart showing a flow of sewing according to the present invention.
FIG. 5 is an explanatory diagram illustrating the timing of yarn release.
[Explanation of symbols]
10 Operation panel 29 Upper thread trimmer motor 30 Upper thread trimmer scissors 31 Lower thread trimmer motor 32 Lower thread trimmer scissors

Claims (3)

Thread trimming scissors,
Thread release means for releasing the thread held by the thread trimmer,
Setting means for setting the sewing movement amount of the sewing product until the thread is released after thread trimming;
Storage means for storing a set value of the sewing movement amount;
And a control means for releasing the thread when the sewing length is set when the set value of the sewing movement amount is larger than the sewing length of the sewing pattern. The sewing machine according to claim 1, wherein the control means releases the thread when the movement direction is changed if the thread is not released when the movement direction of the sewing product is changed. The sewing machine according to claim 1 or 2 , wherein a sewing movement amount until the thread is released is set individually for the upper thread trimming and the lower thread trimming.

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