JPH0373320B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sewing device, and more particularly to a sewing device that automatically performs sewing of a predetermined length that has been memorized and is capable of changing the sewing length. .

[Prior Art] This type of conventional sewing device stores the sewing length as, for example, the number of stitches, compares the stored content with the number of executed stitches during automatic sewing, and stops when they match. For this reason, if a slight dimensional error occurs in the cut shape of the workpiece, or even if the shape is the same, the material of the workpiece changes and there is a difference in the amount of slippage between the feed dog and the workpiece, resulting in a substantial error. When it becomes necessary to change the stored contents, such as when the sewing length changes, new sewing data must be created and stored.

[Problems to be Solved by the Invention] The present invention aims to eliminate the inconvenience of having to re-memorize and reset even if there is a slight increase or decrease in the number of stitches as in the above-mentioned conventional method.

[Means for Solving the Problems] In order to solve the above-mentioned problems, this invention drives a needle up and down, and synchronizes with the up and down movement of the needle to feed the workpiece by a predetermined amount in a predetermined feed direction. a storage means for storing sewing length data based on the number of vertical movements of the needle or the amount of feed; and a first operation means that is operable by an operator and generates a drive command signal when operated by the operator. is activated in response to a drive command signal from the first operation means, and drives the drive means, reads sewing length data from the storage means, and after sewing a predetermined length based on the contents thereof, drives the drive means. a first control means for stopping the means; a second operation means that is operable by an operator and generates a command signal regarding the feed direction and feed amount of the sewing object; and the first control means. Each time the second operating means is operated after the sewing work based on the sewing length data is completed, the needle is moved back and forth once and the workpiece is fed in accordance with the feed direction and feed amount indicated by the command signal. and second control means for controlling the driving means and updating the storage contents of the storage means.

[Function] In the present invention configured as described above, sewing length data based on the number of vertical movements or feed amount of the needle is created and stored in advance in the storage means, and the operator operates the first operation means. When a drive command signal is thereby generated, the first control means drives the drive means, reads sewing length data from the storage means, and stops the drive means after sewing a predetermined length based on the data.

After this automatic sewing, if there is an excess or deficiency in the actual sewing length, that is, if a slight dimensional error occurs in the cut shape of the workpiece, and the excess or deficiency continues to appear in subsequent sewing operations, , the operator operates the second operating means to generate a command signal regarding the feed direction and feed amount of the workpiece. Then, the second control means controls the storage means to cause the needle to reciprocate once and to feed the workpiece in accordance with the feed direction and feed amount indicated by the command signal to execute one stitch sewing, and also to cause the storage means to perform one stitch sewing. Update the memory contents of.

Therefore, the operator operates the second operating means to generate a command signal so that the desired sewing end point coincides with the actual sewing end point, and performs one-stitch sewing or one-stitch backstitch. This allows the storage contents of the storage means to be updated. Thereafter, when the operator operates the first operating means, the first control means controls the driving means in accordance with the updated sewing length data to perform automatic sewing.

[Embodiment] In the figure, reference numeral 1 denotes a sewing machine body, in which a needle 3 is driven up and down by a driving means 2 including a motor, and a feeding device (not shown) having feeding teeth is driven in synchronization with the up and down movement of the needle 3. In the feed device, by energizing the half-needle solenoid 4, the amount of feed per stitch is reduced to half of the normal feed amount, and by energizing the reversing solenoid 5, the feed direction is reversed, similar to a normal sewing machine. be.

Reference numeral 6 denotes a pedal as a first operating means, the center of which is supported so as to be swingable around a horizontal axis, and the forward depression signal generating means 7 and the pedal depression signal generating means 8 are operated by the swinging operation of the pedal. Reference numeral 9 denotes a synchronizing signal generating means for generating a signal synchronized with the vertical movement of the needle 3, and also functions as a needle position detecting means.

Reference numeral 10 denotes an operation panel provided on the front surface of the sewing machine main body 1, which includes various operation keys and a numerical display section 11, as shown in FIG. The memory key 12 and the playback key 13 are used to select a memory mode and a playback mode for automatic sewing. The memorization key 14 is used to specify the break between each process in the memorization mode. Key 1 of patterns 1 to 4
5 is used to specify a storage location in the storage means. The stitch number key 16 is used to select a mode for modifying stored contents. The + key 17, +0.5 key 18, and - key 19 are used as second operation means to make corrections in this mode.

21 is a switch that drives the needle 3 and the feeding device regardless of the stored contents.

Reference numeral 22 denotes a control means including a central processing unit (CPU), which operates based on signals from the forward pedal depression signal generation means 7, the pedal depression signal generation means 8, the synchronization signal generation means 9, and the various operation keys mentioned above. Control means 2, half needle and reversing solenoids 4, 5, display 11; 23 is a storage means (RAM) for storing sewing data for automatic sewing.

When the pedal 6 is depressed forward, the control means 22 outputs a sewing machine operation signal to the drive means 2 in response to a signal from the forward depression signal generating means 7, and the sewing operation is started. When the pedal 6 is returned to the neutral position, the control means 22 outputs a sewing machine stop signal based on the signal from the generating means 7, and the sewing machine stops with the needle 3 in the lower position based on the signal from the synchronizing signal generating means 9. .

When the pedal 6 is pressed forward again, the sewing operation continues in the same manner as described above. When the pedal 6 is pressed back, the control means 22 responds to the signal from the pedal-back signal generating means 8 and outputs a sewing machine operation signal to stop the needle 3 at the upper position, and also operates the thread trimming and thread removal device. (not shown).

When the memory key 12 on the operation panel is pressed to create sewing data for automatic sewing, and any one of the pattern keys 15 for specifying a memorized location is pressed to start sewing work as described above, the sewing operation is performed. The pulse signals output from the synchronizing signal generating means 9 are counted by the control means 22, and the counted data is stored in a register within the control means 22. By stopping the sewing machine at the end of a predetermined process (for example, from one corner of the workpiece to the next corner) and pressing the memorization key 14, the stop data is stored in the register. Even if the process is stopped in the middle of the process, the stop data will not be stored unless the memorization key 14 is pressed. Further, thread cutting data associated with thread cutting work is also stored in the same register.

When the reproduction key 13 is pressed at the end of a series of sewing operations including several stops and thread trimming, each data stored in the register can be transferred to and stored in the storage means (RAM) 23.
At the same time, the control means 22 switches to an automatic reproduction mode of a series of stored sewing operations. Therefore, when the pedal 6 is depressed forward, the control means 22 reads out the stored contents of the memory means (RAM) 23 and starts the sewing operation. Accordingly, the control means 22 counts the pulse signals output from the synchronization signal generation means 9, and when the pulse signals match the count data stored in the storage means (RAM) 23, the control means 22 counts the pulse signals outputted from the synchronization signal generation means 9.
Based on the stored contents, a needle up or needle down stop signal is output, and if thread trimming data is stored, that signal is also output. Then, the machine waits for pedal operation for the next predetermined stitching stroke.

In this way, a series of sewing operations can be reproduced.

When a predetermined process of automatic sewing is performed, the sewing length may be too long or too short for the object to be sewn. This may be caused by the elongation of the workpiece, which occurs only for the workpiece, or by errors in memory settings, errors in cutting dimensions that occur for a large number of workpieces, or feed due to differences in the material of the workpieces even if the shape is the same. Differences in the amount of slippage between the teeth and the workpiece may continue to appear in subsequent sewing operations.

In the former case, each time the switch 21 is operated, the control means 22 outputs an output to control the drive means 2 so that the needle 3 and the feed dog are driven only one reciprocation. Note that this half-hand solenoid 4 is energized to halve the feed amount. Also, in this case, since no modification is made to the contents of the storage means (RAM) 23,
It does not affect subsequent automatic sewing.

In the latter case, by pressing the stitch number key 16 on the operation panel 10, the number of stitches in the predetermined stroke automatically sewn immediately before is displayed on the display section 11.
Each time the + key 17 is pressed, the control means 22 increments the count (number of stitches) data corresponding to the above-mentioned stroke by one and stores it in the storage means (RAM) 23.

At the same time, the control means 22 outputs an output to drive the needle 3 and the feed dog one reciprocation at a time, and also increases the display value on the display section 11 by one.

When the +0.5 key 18 is pressed, the control means 22 outputs an output to energize the half-needle solenoid 4, increments the count data corresponding to the stroke by 1, and stores it in the storage means (RAM) 23 as described above. It is stored together with the excitation data of the needle solenoid 4. At the same time, the display section 11
Increase the displayed value by 0.5. Then, by energizing the half-needle solenoid 4, the feed amount is halved and the needle 3 is reciprocated once. In other words, only sew half-pitch. If you wish to increase the pitch by a further half pitch, press the key 18 again.

When the - key 19 is pressed, the control means 22 excites the reversing solenoid 5 and operates the drive means 2 so that the needle 3 and the feed dog make one reciprocation. In other words, move back one stitch from the already sewn needle position.
At the same time, count data corresponding to the relevant process is
The value displayed on the display unit 11 is decreased by 1 and stored in the storage means (RAM) 23. If you want to go back one stitch further, press key 19 again. If you want to move back by 0.5 stitches, press key 19 to move back by 1 stitch, then press key 18 to increase by 0.5 stitches.

Therefore, when the reproduction key 13 is pressed to automatically reproduce the above process, the control means 22 can read out the corrected count data and perform sewing of the corrected length. If the correction is made twice using the +0.5 key 18, the sewing will be performed as an increase of one stitch when reproducing.

[Effect] As detailed above, in the present invention, after automatic sewing is performed based on the sewing length data in the storage means by operating the first operating means, it is found that the actual sewing length is excessive or insufficient. In this case, the second operating means is operated to generate a command signal regarding a desired feed direction and feed amount, and the second control means executes one stitch sewing in the desired feed direction and feed amount, and the storage means Since it is configured to update the memory contents, it is possible to easily match the actual sewing end point to the desired position while actually sewing a single stitch, and it is also possible to update the actual sewing end point to the desired position while actually sewing a single stitch. This method has the advantage of being highly practical without the inconvenience of having to create and store data.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a sewing device of the present invention, FIG. 2 is a partially enlarged view of an operation panel, and FIG. 3 is a flowchart. Explanation of symbols, 2... Drive means, 6... First operating means (pedal), 17-19... Second operating means (key), 22... Control means, 23... Storage means.

Claims (1)

[Scope of Claims] 1. A driving means for driving the needle up and down and feeding the workpiece to be sewn in a predetermined feed direction at a predetermined feed amount in time with the vertical movement of the needle; a first operating means that is operable by an operator and generates a drive command signal in response to the operation; and a first operating means that responds to the drive command signal from the first operating means. a first control means that is activated by the user and drives the drive means, reads sewing length data from the storage means, and stops the drive means after sewing a predetermined length based on the data; and a first control means that is activated by the operator. a second operating means for generating a command signal regarding the feeding direction and feeding amount of the object to be sewn; controlling the driving means so that each time the operating means is operated, the needle is reciprocated once and the workpiece is fed in accordance with the feeding direction and feeding amount indicated by the command signal;
a second control means for updating the storage contents of the storage means;