JPH0369558B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic sewing machine capable of executing various set patterns, and particularly to thread trimming control thereof.

[Prior Art] Currently, so-called electronic sewing machines are known that automatically perform a series of operations from the start of sewing various patterns to thread cutting after sewing is completed under the control of a computer or the like.

Normally, in this type of sewing machine, multiple pieces of pattern data consisting of various commands are stored on a floppy disk, etc., the required pattern data is read out as appropriate, and various mechanisms are controlled based on the data. It's becoming like that.

By the way, when sewing a large number of small items etc. with a sewing machine, in order to prevent each completed sewing product from being lost, so-called connective sewing is performed in which the thread is not cut after sewing is completed and the next sewing item is sewn consecutively. (See Figure 7).

However, even when sewing small items, if there is no risk of the product being lost, such as when the number of items to be sewn is small, it may be preferable to cut the thread for each item instead of sewing stitches. In this electronic sewing machine, two types of pattern data were prepared for each pattern so that it could correspond to any sewing style. That is, normal pattern data having a command for instructing thread cutting (thread cutting command) is stored on a recording medium such as a floppy disk, and
Pattern data for stitching without thread trimming commands was stored on the floppy disk.

[Problems to be Solved by the Invention] As mentioned above, in conventional electronic sewing machines, two types of pattern data were prepared for each pattern, differing only in the presence or absence of a thread trimming command, so it took a lot of time to create pattern data. The problem was that it took a lot of time and a large amount of storage space was required to store it.

This invention has been made by focusing on the above-mentioned problem, and it is possible to perform normal sewing and connecting sewing using pattern pattern data for normal sewing that causes thread trimming, and to create pattern pattern data. An object of the present invention is to provide an electronic sewing machine capable of reducing time spent and storage area for storing pattern data.

[Means for Solving the Problems] The present invention provides an electronic sewing machine that performs a series of sewing operations including a thread cutting operation, and provides a setting for selectively setting whether or not to perform thread cutting at the end of the sewing operation. and a control means for prohibiting execution of a thread cutting operation based on pattern pattern data in a state where thread cutting is set.

[Operation] In the present invention, when the setting means sets the thread trimming to non-operation, even if the pattern data read from the storage means includes a command instructing thread cutting, the control means prohibits thread trimming operation. Therefore, by storing only the pattern data for normal sewing including thread trimming commands in the storage means, it is possible to freely switch between normal sewing with thread trimming and connecting sewing without thread trimming. I can do it.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to FIGS. 1 to 7.
This will be explained based on the diagram.

FIG. 1 is an external perspective view of the electronic sewing machine in this embodiment.

In the figure, 1 is a sewing machine bed, and 2 is an arm provided on the sewing machine bed 1, which has a built-in mechanism for raising and lowering a needle bar 4 having a needle 3 therein. Further, although not particularly shown in the drawings, a stitch forming mechanism is constituted by a well-known hook, a mechanism for rotating the hook, and the above-mentioned up-and-down mechanism. Reference numerals 5a and 5b are frame-shaped upper and lower pressers that hold the fabric W to be sewn. 6 is this double press 5
a, 5b on the horizontal plane in the X-axis direction; 7 is the Y-pulse motor on the horizontal plane, moving the pressers 5a, 5b in the Y-axis direction; both motors 6, 7 are Both are housed in the sewing machine bed 1. In addition, above 5a,
5b to 7 constitute a transport mechanism. Reference numeral 8 denotes an intermediate presser which mechanically moves up and down in synchronization with the up and down movement of the needle bar 4. Reference numeral 9 denotes a thread tension mechanism provided on one side of the arm, and is located in the thread supply path from the bobbin (not shown) to the needle hole of the needle 3. 10A is a thread tension solenoid that operates the thread tension mechanism 9, and 10B is a thread trimming solenoid that operates a known thread trimming mechanism.

FIG. 2 is a diagram showing details of the thread tension mechanism 9. In the figure, 91 is a hollow guide tube fixed to one side of the arm 2, and a sliding portion 92 on the right side of the guide tube 91 is a slot. Reference numeral 93 denotes a push rod inserted into the guide tube 91, which is moved to the right in the figure by the operation of the solenoid 10. 94 is a spring seat inserted into the sliding portion 92, and this spring seat has a guide portion 94a guided by a slot in the sliding portion 92 of the guide tube 91;
When this guide portion 94a is pressed by the push rod 93, it moves to the right. 95
A and 95b are a pair of thread tension discs that are loosely inserted into the sliding portion 92 of the guide tube 91, and are located between the stepped portion of the guide tube 91 and the spring seat 94.
The spring seat 94 and the tension nut 96 are in contact with each other by a tension spring 97 interposed between them. In addition, I is an upper thread.

Furthermore, FIG. 3 is a block diagram showing the configuration of the control system circuit in this embodiment.

In the figure, 11 is a CPU (central processing unit) as a control means. 12 is a ROM that stores operation control programs, etc.; 13 is a floppy disk (FD) as a storage means for magnetically recording various pattern pattern data; and 14 is a floppy disk for reading pattern pattern data from this FD 13. Tuppy disk drive (FDD), 15 is this
A RAM that temporarily stores the pattern data read out by the FDD 14 and reads out predetermined pattern data to the CPU 11 according to instructions from the CPU 11, and 16 is a mechanism for moving the needle 3 up and down and rotating the hook. The sewing machine motor is the driving source,
A sewing machine motor drive circuit 17 drives the sewing machine motor 16, and is controlled by the CPU 11. Reference numeral 18 indicates a pulse motor drive circuit that drives the X pulse motor 6 and Y pulse motor 7 according to control signals from the CPU 11. Reference numeral 19 indicates two types of sewing: normal sewing with thread trimming and connecting sewing without thread trimming. A setting switch 20 serves as a setting means for selectively setting a desired sewing form among the sewing forms, and is a solenoid drive circuit for driving the thread tension solenoid 10, which is controlled by the CPU 11. 21 is a thread cutting solenoid drive circuit that drives the thread cutting solenoid 10B, and 22 is an input device for inputting various information, instructions, etc.

Next, the operation of the electronic sewing machine having the above configuration will be explained based on FIGS. 4 to 7.

FIG. 4 is a flowchart showing the overall control operation in this electronic sewing machine.

When the power is turned on, each part of the sewing machine is set and reset to its initial state (step 1).
Here, when the operator inputs various instruction information from the input device 21, processing operations are performed according to the instruction information (step 2). In step 2, when the pattern instruction information is input,
Pattern pattern data corresponding to the instruction information is read out of the various pattern data recorded on the FD 13 and stored in the RAM 15. Further, after instructing the desired pattern, the operator sets the setting switch 19 depending on whether or not to perform thread trimming, that is, whether to perform normal sewing operation or continuous sewing. Note that "1" of the setting switch 19 indicates normal sewing, and "2" indicates connecting sewing.

When the pattern instruction information is input,
The CPU 11 determines that the information setting operation is completed (step 3) and makes the sewing operation possible. After this, it is determined whether the sewing start switch (not shown) has been pressed (step 5), and if it has not been pressed, the process returns to step 2. If it has been pressed, the setting position of the previously selected switch 19 is set. Read and store the information in RAM1
5 (step 6). And RAM1
X, Y pulse motors 6, 7 and sewing machine motor 1 according to the pattern data stored in 5.
6, that is, control of the stitch forming mechanism and the conveying mechanism is started (steps 7 and 8). At the same time, steps 10 and 11 of the normal sewing and connecting sewing control routines are selected according to the sewing mode set in the setting switch 19 (step 9).
The selected routine is executed while controlling the stitch forming means. When the sewing operation is completed, the process returns from step 13 to step 2 to prepare for the next sewing operation.

By the way, the various pattern data recorded in the FD13 mentioned above are all stored in the CPU1.
It consists of multiple commands input to 1.
These commands include, for example, a direction command that instructs the conveying direction by the conveying means, a stop command that stops the stitch forming means and the conveying means in operation, a null feed command that stops only the stitch forming means and operates the conveying means, There are a completion command for stopping both means when the sewing operation is completed, a thread cutting command for activating the thread cutting means, etc., and various pattern data are configured by combinations of these commands.

If normal sewing is now set by the setting switch 19, the control routine shown in FIG. 5 is executed in step 10. That is, when the sewing operation is completed and a thread trimming command is issued, the thread trimming solenoid drive circuit 22 is activated to operate the thread trimming solenoid 10B to perform a well-known thread trimming operation. In addition, during this thread trimming operation, the drive circuit for the thread tension solenoid 10A is also activated, so the thread tension disc 95 is operated to provide appropriate thread tightness to the seam.
The upper thread I, which was held between a and 95b, is released. Therefore, the thread trimming mechanism can easily pull out the upper thread I to an appropriate position and perform a stable thread trimming operation.

In addition, in order to perform connecting stitches, set switch 1
If 9 is set, the 6th
The control routine shown in the figure is executed. in this case,
The stitch forming mechanism and the conveying mechanism operate in accordance with various commands included in the pattern data in the same manner as during normal sewing. In addition, in the case of the thread trimming mechanism, even if a thread trimming command is output, the CPU 11
Since this is invalidated and the operation of the thread cutting mechanism is prohibited (step 120), the thread I will not be cut.

In this way, even if you want to perform two types of sewing, connecting sewing and normal sewing, on a certain pattern, by switching the setting switch, the pattern data for normal sewing, including thread trimming commands, will be available. Connecting stitches can be performed using the .
Therefore, the pattern data to be stored in the FD 13 is approximately 1/2 that for normal sewing.

In addition, in this embodiment, the thread tension solenoid is turned on in response to the idle feed command, stop command, and completion command to release the thread from being clamped (steps 111 to 119). , and can smoothly unwind the thread during removal.

[Effects of the Invention] As explained above, according to the present invention, connecting stitches can also be performed using pattern pattern data for normal sewing, so there is no need to newly prepare pattern pattern data for connecting stitches. This has the effect that the time spent on creating pattern data can be shortened, and the storage area for the pattern data for each pattern can be significantly reduced, making it possible to use the storage area effectively.

[Brief explanation of drawings]

Fig. 1 is an external perspective view showing an embodiment of the present invention, Fig. 2 is an enlarged longitudinal sectional front view showing details of the thread tension mechanism shown in Fig. 1, and Fig. 3 is a control of the thread tension mechanism shown in Fig. 1. A block diagram showing the system circuit configuration, FIG. 4 is a flowchart showing the overall control operation in this embodiment, FIG. 5 is a flowchart showing the normal sewing control routine in FIG. 4, and FIG. 6 is a flowchart showing the normal sewing control routine in FIG. FIG. 7 is a flowchart showing the joint sewing control routine, and is an explanatory plan view showing an example of the joint sewing. 3...Needle, 9...Thread tension mechanism, 10A...Thread tension solenoid, 10B...Thread trimming solenoid, 1
1...CPU (control means), {5a...Upper presser, 5b
... Lower presser foot, 6 ... X pulse motor, 7 ... Y pulse motor} Conveyance mechanism, I ... Needle thread, FD ... Floppy disc.

Claims (1)

[Claims] 1. A storage means that stores a plurality of pattern pattern data consisting of a combination of various commands such as a direction command for instructing the cloth feeding direction and a thread trimming command for instructing the operation of the thread trimming mechanism, and a storage means for storing a plurality of pattern pattern data consisting of a combination of various commands such as a direction command for instructing the cloth feeding direction and a thread trimming command for instructing the operation of the thread trimming mechanism; In an electronic sewing machine having a means for selecting pattern data, a setting means for selectively setting whether to perform normal sewing or connecting sewing, and when a thread trimming command is output in a state where normal sewing is set. is valid,
The electronic device is characterized in that it is provided with a control means for disabling a thread trimming command even if it is outputted in a state where connecting stitching is set, so that the thread trimming mechanism operates during normal sewing but does not operate during connecting sewing. sewing machine.