JPS63212396A - Electronic sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 tension control thereof.

[Prior Art] Currently, so-called electronic sewing machines are known that use a control device such as a computer to move fabric in a predetermined direction according to a predetermined pattern to perform sewing.

Conventionally, this electronic sewing machine is equipped with a floppy disk or the like that stores pattern data for various patterns, and performs sewing operations in accordance with the required pattern data.

Incidentally, a sewing machine is usually equipped with a thread tension device as a means for applying appropriate tension to the sewing thread.

This thread tension device is equipped with two thread tension discs that can be opened and closed.
The system attempts to apply tension by closing these two thread tension discs and sandwiching the thread.In conventional electronic sewing machines, the opening and closing of the thread tension discs is controlled by a foot pedal or a foot pedal that stops the sewing machine. It is linked to the thread trimming mechanism and controlled mechanically or electrically using an electromagnetic solenoid.

[Problems to be Solved by the Invention] However, with conventional electronic sewing machines, thread tension control cannot be performed in accordance with various sewing forms, and the range of use is limited. This sewing method includes, for example, normal sewing in which a seam is continuously formed and a thread cutting operation is performed after the sewing operation is completed, and prevention of fabric slippage when sewing two pieces of fabric three-dimensionally. In order to prevent each sewn item from being lost after sewing is completed when sewing small items, sewing the next item without cutting the thread after sewing is completed. (See Figure 9(b))
etc.

Each of these sewing forms has different drive timings such as the vertical movement of the needle, the conveyance of the fabric, and the thread trimming mechanism.
The operation timing of the yarn tension supply means is also different. For this reason,
Conventionally, sewing machines have been prepared specifically for each type of sewing, or the mechanism has been extensively modified to accommodate each type of sewing.

However, there are problems in that installing multiple sewing machines requires a great deal of expense, and changing the mechanism requires specialized skills and a lot of work time.

This invention was made in view of the above-mentioned problems, and an object of the present invention is to provide an electronic sewing machine that allows any person to easily perform sewing in various sewing forms without making any equivalent changes to the sewing machine mechanism. do.

[Means for Solving the Problems] The present invention provides a setting means for setting a sewing form to be applied to a pattern to be executed among a plurality of sewing forms, and a thread tension supply method according to the set sewing form. and control means for controlling the means.

[Operation] In the present invention, when the operator operates the setting means to set the sewing form to be applied to the pattern, the thread tension supply means operates at a timing suitable for the sewing form.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to FIGS. 1 to 8.

FIG. 1 is an external and odor 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 forms a vertical mechanism for a needle bar 4 having a needle 3. Further, although not particularly shown in the drawings, a stitch forming means is constituted together with the well-known hook, a mechanism for rotating the hook, and the above-mentioned up-and-down mechanism. 5a, 5b are &i fabric W to be made
A frame-shaped upper presser and lower lever that hold the Reference numeral 6 designates an X-pulse motor that moves both presser feet 5a and 5b in the X-axis direction on a horizontal surface, and 7 designates a Y-pulse motor that similarly moves the presser feet 5a and 5b in the Y-axis direction on a horizontal surface.
Both motors 6.7 are housed within the sewing machine bed l. Further, the above-described components 5a, 5b to 7 constitute a conveying means. 8 is an intermediate presser which moves up and down at a timing slightly delayed from 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, which is used to tighten the needle 3 from the bobbin (not shown).
It is located in the thread supply path leading to the needle hole. IO is a thread tension solenoid that operates the thread tension mechanism 9, and is fixed inside the arm 2;
and the thread tension mechanism 9 constitute a thread tension supply means.

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 slotted. 93 is the guide t! 491, which is moved to the right in the figure by the operation of the solenoid 10. Reference numeral 94 denotes a spring seat inserted into the sliding portion 92, and this spring seat has a guide portion 94a that is guided by a slot in the sliding portion 92 of the guide tube 91, and this guide portion 94a is connected to the push rod 93. When pressed, it moves to the right.

Reference numerals 95a and 95b are a pair of thread tension discs which 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. Spring seat 94
and the tension nut 96 are in contact with each other by a tension spring 97 interposed between the tension nut 96 and the tension nut 96. In addition, ■ is an upper thread.

Further, 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 an operation control program, etc.; 13 is a floppy disk (FD) that magnetically records various pattern data; 1;
4 is a floppy disk drive (FDD) that reads pattern data from this FD 13, and 15 is this FD.
A RAM temporarily stores the pattern data read out by D14, 16 is a sewing machine motor which is a drive source for the mechanism for moving the needle 3 up and down and rotating the hook, and 17 is a sewing machine that drives this sewing machine motor 16. The motor drive circuit is controlled by the CPU II. 18 is a pulse motor drive circuit that drives the X pulse motor 6 and Y pulse motor 7 according to a control signal from the CPU II; 19;
20 is the thread tension solenoid 1; 20 is the thread tension solenoid L; 20 is the thread tension solenoid l;
In the solenoid drive circuit for driving 0, 21, which is controlled by the CPU II, 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 8.

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 l). Here, when the operator inputs various instruction information from the input device 21, processing operations according to the instruction information are performed (step 2).
. In this step 2, when instruction information for a pattern is input, pattern pattern data corresponding to the instruction information is read out from among various pattern pattern data recorded in the FD 13, and is stored in the RAM 15. be done. Further, after specifying the desired pattern, the operator also sets the setting switch 19 in accordance with the sewing form applied to that pattern.

When the instruction information for the pattern is input, the CPU II determines that the information setting operation is complete, and enters the sewing operation ready state in step 3). After this, it is determined whether or not the sewing start switch (not shown) has been pressed (step 5). 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, i.e. The sewing pattern is read and the information is stored in the RAM 15 (step 6). Then, control of the X and Y pulse motors 6.7 and the sewing machine motor 16, ie, control of the stitch forming means, is started in accordance with the pattern data stored in the RAM 15 (step 7.8). At the same time, a thread tension control routine (steps 10 and 11.12) is selected according to the sewing mode set in the setting switch 19 (step 9), and the selected routine is executed while controlling the stitch forming means. I will do it. When the sewing operation is completed, the process returns from step 13 to step 2 to prepare for the first M sewing operation.

By the way, the various pattern data recorded on the FD 13 described above are all composed of a plurality of commands input to the CPU II. This command is 1
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 that are in operation, a null feed command that stops only the stitch forming means and activates the conveying means, and a command that stops both the stitch forming means and the conveying means when the sewing operation is completed. There are completion commands for stopping the thread cutting means, thread cutting commands for activating the thread cutting means, etc., and various pattern data are configured by combinations of these commands.

Furthermore, in this embodiment, the sewing form of the pattern is determined depending on what commands are included in addition to the direction commands.

That is, among the three sewing modes in this embodiment, normal sewing includes a thread trimming command in addition to the direction command. In addition, for sewing, basting includes a direction command, a jump feed command, and a thread trimming command. Furthermore, in joining stitches, in addition to the direction command, stop command, and completion command, the basting may also include a sewing skip feed command.

Therefore, if the sewing mode of the pattern to be executed is normal sewing, and the setting switch 19 is set according to the sewing mode, the thread tension control routine shown in FIG. 5 is executed in step IO. That is, the thread tension solenoid IO is kept OFF until the sewing operation is completed and a thread trimming command is issued (steps 101 and 102).
, When a thread trimming command is issued, the thread tension solenoid 10 is turned on (steps 101 and 102).

Therefore, during the sewing operation, the push rod 93 is located on the right side, one thread tension disc 95a is pressed by the tension spring 97, and the upper thread I is held between the two thread tension discs 95a and 95b.
Appropriate tension is generated in the upper thread I, and a seam can be formed with appropriate thread tightening.

Further, when the sewing operation is completed and a thread trimming command is issued, the thread tension solenoid IO is activated (step 103).
The push rod 93 is pushed to the right in FIG. 2, and the spring seat 94 is pushed up against the tension spring 97. Therefore, both thread tension discs 95a.

The pinching state of the upper thread I by the upper thread 95b is released, and the tension on the upper thread I is released. Thereby, the thread trimming mechanism can easily pull out the upper thread I to an appropriate position, and a stable thread trimming operation can be obtained.

If the setting switch 19 is set to basting in accordance with the sewing type (9) of the pattern to be executed, the thread tension control routine shown in FIG. 6 is executed in step 11. That is, in this case, the thread tension solenoid 10 is turned on every time the skip feed command is output until the sewing operation is completed and the thread trimming command is output (steps 114, 116, 117). When the sewing operation is completed and the thread trimming command is output, the thread tension solenoid 10 is turned on (steps 111 and 112).
When the thread trimming operation is completed, the thread tension solenoid is turned off (step 112).

As a result, when only the conveying means is activated,
The needle thread I can be smoothly supplied as the fabric moves, the thread tightness at the seam will not become stronger than necessary, and the thread can be trimmed appropriately.

Further, when the setting switch 19 is set to execute the connecting stitch, the thread tension control routine shown in FIG. 7 is executed in step 12.

In this case, the sewing operation is performed by the above-mentioned normal sewing or basting sewing, so if the jump feed command is output, the thread tension solenoid is turned OFF for normal sewing and turned ON for basting sewing (step 121). .122,123),
Empty feed is performed properly. Also, if a stop command is output before the 1M operation is completed, the thread tension solenoid IO will turn OFF.
N (steps 124, 125, 126), this stop command is for example, as shown in FIG.

This is applied when trying to attach a link to W2.

In this case, the commands of the pattern data are left sewing command → stop command → right sewing command, and during the stop command, the left side sewing product is pulled out, the right side sewing product is set, and sewing is performed again.

In this pattern data, during the stop command,
Since the thread tension solenoid is ON, the thread can be easily pulled out when replacing the sewn product.

Further, when all the stitches are formed and the completion command is read out, the thread tension solenoid IO is turned ON. This allows the fabric to be taken out with ease while the threads remain connected.

As described above, in this embodiment, the opening and closing of the thread tension discs 95a and 95b can be controlled by an extremely simple operation in which the operator simply sets the setting switch 19 according to the sewing form of the pattern to be formed. Can be done.

In addition, in the above embodiment, three types of sewing methods, normal sewing, basting sewing, and connecting stitches, have been explained as examples of the sewing methods of the pattern, but the present invention can also be applied to other sewing methods. However, the present invention is not particularly limited to the above embodiments.

[Effects of the Invention] As explained above, according to the present invention, it is possible to select patterns that are suitable for various sewing patterns by an extremely simple operation of switching one selection means without making any equivalent changes to the sewing machine mechanism. This has the effect of being able to perform sewing while applying thread tension at the appropriate timing.

[Brief explanation of the drawing]

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. 4 is 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 thread tension normal sewing control routine in FIG. 4, and FIG.
The figures are a flowchart showing the thread tension sewing control routine in Fig. 4, Fig. 7 is a flowchart showing the thread tension joining sewing control routine in Fig. 4, and Fig. 8 is an explanatory plan view showing an example of the joining stitch. FIG. 9(a) is an explanatory plan view showing an example of basting stitching, and FIG. 10(b) is an explanatory plan view showing an example of connecting stitches. 3... Needle 9... Thread tension mechanism) Thread tension supply means

Claims (1)

[Claims] A seam forming means that moves the needle up and down and rotates the hook to form a seam, a conveyance means that conveys the fabric to be sewn, a tension supply means that applies a predetermined tension to the sewing thread, and a plurality of sewing forms. An electronic sewing machine comprising: a setting means for setting a sewing form to be applied to a pattern to be executed; and a control means for controlling the tension supply means according to the set sewing form.