JPH0466598B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a feed amount control device for a differential feed sewing machine that automatically adjusts one feed amount. [Prior Art] Conventionally, in this type of sewing machine, an operator normally adjusts the upper feed amount and the setting amount using a pitch setting dial or a pitch setting lever, respectively, so as to obtain the amount of setting amount suitable for the work being sewn. The upper feed amount was adjusted separately. When the sewing point has been reached after the start of sewing, the worker uses his/her foot to operate an auxiliary pedal connected to the upper feed adjustment lever to change the upper feed amount, thereby performing a predetermined setting operation. [Problem to be solved by the invention] However, since this adjustment is performed using a foot pedal, it is difficult to make subtle increases or decreases in the amount of upward feed, and it is difficult to make subtle increases or decreases in the amount of upward feed. The upper feed amount was delicately adjusted by hand to suit the sewn product, giving the product its texture. Therefore, the process of creating a texture requires skill, specialized means are brought into the process, and the work of creating the texture of the texture depends on the operator's hand, resulting in variations in texture, etc. Even if the adjustment values for one sewing machine are the same, if the operator is different, the adjustment values cannot be used as they are and another adjustment is required, reducing work efficiency. It had the disadvantage of being forced to do so. In addition, in order to solve this drawback, during intermediate sewing between the normal top feed amount and the top feed amount with skewing, the top feed amount is automatically changed from the normal top feed amount to the top feed amount with skewing while advancing this intermediate stitching. However, since this feed rate change was simple, the finished product remained unnatural and the product was inferior in quality. The present invention provides a device and sewing method capable of increasing the number of intermediate stitches in which the feed amount is automatically changed as described above, thereby creating a difference in the increase/decrease in the feed amount during each intermediate stitch, and by using the sewing method, a natural finish can be achieved. The purpose is to obtain. [Means for solving the problem] In a sewing machine that has two different feed mechanisms for performing differential feed stitching, a drive means that is connected to one of the feed mechanisms to change the feed amount, and a drive means that changes the feed amount at a specific needle position of the sewing machine. A stitch count counter that detects and counts the number of stitches, and a command means that commands the end of a predetermined sewing section that is sewn with a constant feed amount.
a first input means for inputting these feed amounts into a storage means so as to be able to sequentially sew three or more predetermined sewing sections using the above feed amounts; and at least two or more intermediate portions interposed between the sequentially set predetermined sewing sections. a second input means for inputting into the storage means two or more different numbers of stitches corresponding to each intermediate sewing section sequentially in the sewing section; a calculating means for calculating a feed amount for each predetermined number of stitches so that the feed amount can be gradually increased or decreased from a feed amount in a predetermined sewing section in front of the sewing section to a feed amount in a predetermined sewing section in the rear; When a command from the command means is detected during sewing, the intermediate sewing section is sewn with the first number of stitches, the feed amount is calculated by the calculation means, and the drive means is operated to increase or decrease the feed amount to the second feed amount. When the end of the first number of stitches is detected, a predetermined sewing section is sewn using the second feed amount, and when a command from the command means is detected while the predetermined sewing section is being sewn using the second feed amount, the second stitch is sewn. The intermediate sewing section is sewn according to the number of stitches, the feed amount is calculated by the calculating means, the driving means is operated, the third feed amount is increased or decreased, and this is input into the storage means as the number of feed amounts for the predetermined sewing section. and a control means for repeating the process as many times as the number of stitches in the intermediate sewing section. [Operation] In the present invention, each predetermined sewing section and each intermediate sewing section are automatically set by inputting the feed amount for a plurality of predetermined sewing sections and inputting a plurality of intermediate stitch numbers using a setting switch. If the sewing product is the same, the setting values set on one sewing machine can be used as they are on other sewing machines without relying on the skill of the operator, and the amount of unevenness can be reduced. The adjustment work is simple, can be done uniformly and quickly, and it is possible to stably obtain high-quality finished products that are equivalent to those produced by skilled workers. [Embodiment] FIG. 1 is a side view of a sewing machine according to an embodiment of the present invention, in which a main motor 2 is installed under a table 1' of a sewing machine body 1, and the rotation of this main motor 2 is caused by a V-belt 3. The pulley 4 connected to the main shaft via the main shaft is rotated. Further, a pedal switch 5 for starting and stopping the main motor is provided below the main motor 2, and the pedal switch 5 is also provided with a setting command switch 6 for commanding the end of a predetermined sewing section. Further, an upper feed drive pulse motor (drive means) 7 for changing the upper feed amount is provided above the table 1' of the sewing machine body 1, and this upper feed drive pulse motor 7 protrudes outward from the sewing machine body 1. The upper feed amount is adjusted by driving a lever 8 which is pivotally attached to the feed adjustment shaft 1a, and an origin switch 9 is provided on the rotating portion 8' of this lever 8.
The notch position of the rotating part 8' is detected and the pulse motor 7 is
Outputs the origin position of. Further, a lower feed amount adjustment dial 10 is provided on the front panel of the sewing machine main body 1, and a lower feed detection lever 11 that detects the position of the lower feed amount adjuster by rotating the lower feed amount adjustment dial 10 is activated by the sewing machine. The lower feed detection lever 11 is provided above the origin switch 9 of the main body.
A potentiometer 12 for converting the movement of the sewing machine into voltage is provided, and a control box 13 is provided at the top of the sewing machine body. The lower feed detection lever 11 moves in the C' direction when the lower feed amount adjustment dial 10 is rotated in the downward feed amount increasing direction, that is, in the C direction, and when it is rotated in the downward feed amount decreasing direction, that is, in the D direction. connected to move in the direction. FIG. 2 is a block diagram of the control means for the operating section of a sewing machine according to an embodiment of the present invention, in which the central processing unit CPU executes a series of operations according to a program.
14, upper feed amount indicators 16a to 16e that display the upper feed amount in the first to fifth predetermined sewing sections via the LED drive circuit 15, and intermediate stitches that display the first to fourth intermediate sewing in number of stitches. Stitch number display 17a-1
7d, a lower feed amount display 20 that displays the lower feed amount is connected. In addition, corresponding to these indicators, upper feed amount setting switches (first to fifth upper feed amounts) are set.
Input means) 21a to 21d, stitch number setting switches (second input means) 22a to 22d for setting intermediate stitch number indicators 17a to 17d are connected to a central processing unit (calculation means, control means) CPU14. There is. Furthermore, the end of the specified sewing section is processed by the central processing unit.
An adjustment command switch (command means) 25 that commands the CPU 14, an upper shaft detection device 26 that outputs an upper shaft detection signal for synchronizing the number of stitches, and a main shaft motor for sewing machines in which the pulley 4 of the sewing machine is rotated by hand. 2, a lower feed amount reading device 28 for reading the lower feed amount by detecting changes in the voltage of the potentiometer 12 shown in FIG. A pitch display selection LED 29 that directly displays the feed amount by the feed pitch, a pitch display switch 30 that selects this pitch display selection LED 29, and a ratio display that displays the upper feed as a relative amount with the lower feed amount as "1". Selection LED 31, this ratio display selection LED
A ratio display switch 32 for selecting 31 is connected to the central processing unit CPU14. The upper feed drive pulse motor 7 in FIG.
A read/write memory RAM 34 (storage means) for storing setting contents is also connected, and a battery 35 is connected to this read/write memory RAM 34 to back up the contents so that the contents are not erased even after the power is turned off. . In addition, pattern setting switches 36a, 36b, 36 for setting a plurality of reset amounts in the read/write memory RAM 34 are provided.
c, 36d are connected to the central processing unit CPU14. Next, the operation of this embodiment will be explained. First, when the power is turned on, it is read whether or not the origin switch 9 in Fig. 1 is at the origin (with the upper feed amount of 2.5 mm as the origin), and if the origin switch 9 is on, it is turned off. The pulse motor 7 is driven so that the signal is switched in the direction of (direction B), and if it is off, the signal is switched in the direction of on (direction A), and the passing point is set as the movement origin of the pulse motor 7 (upward feed). 2.5mm). After detecting the origin, read the upper feed amount of the first predetermined sewing section displayed on the first upper feed indicator 16a, and drive the pulse motor 7 in the direction A or B so as to reach this first upper feed amount. do. This pulse motor 7 increases the feed amount A
When the upper feed lever 8 rotates in the direction A', the upper feed lever 8 rotates in the direction A', and as shown in FIG. ′ to increase the feed amount and carry out cloth feeding motion. Note that the lower feed dog 38 makes a constant cloth feed movement from the arrow C to the arrow D from bottom to top. Further, as shown in FIG. 2, the operator sets the target upper feed amount for each predetermined sewing section and the number of stitches for the intermediate sewing section for the sewn product in advance using the first to fifth upper feed amount setting switches (21a to 21e). ), the first to fourth intermediate stitch number setting switches 22a to 22d, and the lower feed amount is input using the lower feed amount adjustment dial 10. The input contents are stored in the read/write memory RAM 34, and further 1st to 5th upper feed amount display 16
a to 16e, first to fourth intermediate stitch number indicators 17
a to 17d, it is also sent to the lower feed amount display 20 and displayed, and the pulse motor 7 is driven so that the contents of the first upper feed amount display 16a and the upper feed amount of the sewing machine are the same. Next, the sagging operation will be explained using sleeve stitching as an example. First, before starting sewing, the worker selects the first to the first sections of the nine sections indicated by A to J on the armhole 41 of the sleeve 40 to be sewn on the jacket 39 in FIGS. 4 to 6.
The upper feed amount of each of the fifth predetermined sewing sections and the number of intermediate stitches of the first to fourth intermediate sewing sections are set as described above. In the section a-b, sewing is performed according to the first upward feed, and when point b is reached, the operator presses the setting command switch 25 to generate an end command signal for the predetermined sewing section and sends the command signal to the central processing unit CPU 14. Notifies the start of sew-in (first intermediate sewing section).
The central processing unit CPU 14 receives the ON signal from the setting command switch 25 and increases or decreases the setting amount in response to the number of intermediate stitches so that the top feed amount becomes the second top feed amount after this intermediate sewing section. To perform the reduction, find the amount of change in the top feed per stitch,
The upper feed amount is increased or decreased for each stitch by the determined upper feed change amount, and the pulse motor is activated in synchronization with the upper shaft detection signal (needle position signal) from the upper shaft detection device 26 so that the upper feed amount is increased or decreased for each stitch. Drive 7. At point c after the sewing of the set number of stitches has been detected by the stitch count counter, the CPU 14 detects a second predetermined sewing section and performs sewing up to point d using the second upper feed amount. After sewing up to point d, press the setting command switch 2
5 is turned on, the central processing unit CPU 14 receives the turning on of this set-in command switch 25, and
The start of the second intermediate sewing is determined, and the amount of decrease or increase in top feed per stitch is determined in accordance with the number of second intermediate stitches so that the top feed amount becomes the third top feed amount after this second intermediate sewing. , the pulse motor is driven so as to decrease or increase only the determined upper feed decrease or increase amount for each stitch. From then on, do E
Sewing is performed in order from point to point J, and the armhole work is completed. In this way, by freely selecting and combining the number of stitches in the intermediate sewing section, it is possible to subtly change the change in the serration. In addition to sleeve stitching as explained in the above embodiments, other possible applications include back yokes, cuffs, side hooks, slacks side hooks, skirt pleats, hemline three-folds, and the like. The sleeve stitching operation of this embodiment will be explained based on the flowcharts shown in FIGS. 7 and 8. (1) Initial settings Here, as shown in Figure 2, the upper feed amount for the first predetermined sewing section is 2.0 mm, the upper feed amount for the second predetermined sewing section is 5.0 mm, and the number of stitches for the first intermediate sewing section is 20. As for the hands, set and input numerical values using the panel switch in the same manner as below (S ₁ ). (Top feed amount 0.1mm is considered as one pulse). (2) The first predetermined sewing section The upper feed amount of the sewing machine is controlled by the pulse motor 7.
The upper feed amount is set to 2.0 mm (initial position) (S ₂ ), and when the operator turns on the start pedal (S ₃ ), the sewing machine turns on the reset command switch from sleeve A point (Figure 4).
Sewing of the first predetermined sewing section is started until the first predetermined sewing section is reached. (3) First intermediate sewing section When the sewing reaches point B and the operator turns on the setting command switch (S ₄ ), the process moves to the setting control (Fig. 8) as the first intermediate sewing section (S _Five ). The immediately preceding (first) upward feed amount X and the next (second) upward feed amount Y are read into the memory. [3-1] Rotation direction check Subtract the first up feed amount and the second up feed amount (S ₂₀ ), and find the setting direction based on the magnitude relationship (S ₂₁ ) (in this specific example, 20-50 <0,
(drives the amount of distortion in the direction of increase). [3-2] Check the number of stitches for 0 ( _S22 ) When the number of stitches is checked for 0, the upper feed detection device 26
Jump to c and set the upper feed to the upper feed amount without synchronizing with the upper axis detection signal from 1. This specific example has 20 stitches, so move on to the next step. [3-3] Basic calculation (PN calculation) ( _S23 ) Divide the absolute value of the difference between the first top feed amount X and the second top feed amount Y by the number of stitches N, and calculate the top feed change amount PN per stitch.
The amount of upward feed for each stitch is calculated by calculating and evenly distributing the remainder. For example, |X-Y|/N=|20-50|/20=1...10, and let the quotient 1 be PN and the remainder 10 be RP. Next, if there is any remaining pulse RP, the following calculation is performed to process it. N/RP=20/10=2 SC=2 In other words, for the 20 stitches in the first intermediate sewing section, each stitch is
The fabric feed amount is increased by 0.1 mm, and the upper feed amount is increased by 1 pulse (0.1 mm) every 2 stitches, and these calculated values are stored in the read/write memory.
The values are stored in the RAM 14 in the number of stitches counter NCT, top feed change amount PNCT, remainder counter RPCT, and skip counter SCCT. [3-4] Pulse motor drive timing After checking the number of remaining stitches to 0 using the intermediate sewing stitch counter ( _S24 ), the upper shaft detection signal from the upper shaft detection device 26 and the rotation signal of the sewing machine are checked (S24). _{twenty five} ). When the upper shaft detection signal is input by driving the main motor 2, it is assumed that the number of stitches of 1 has been executed, and the count is decremented by 1 ( _S26 ). [3-5] Calculation of upper feed amount for each stitch (PN set) ( _S26 ) Read/write memory RAM that stores residual pulse RP
Check the value of area RPCT in area 14, and if it is other than 0, subtract 1 from the value of the skip counter SCCT for each stitch in order to distribute the surplus pulses uniformly within the number of stitches N, and if the value of the skip counter SCCT is 0. When the pulse RP reaches 1, the remaining pulse RP is subtracted by 1, and 1 is added to the pulse counter PNCT as the remaining pulse RP. The number of stitches is obtained by counting the detection signal from the upper shaft detection device 26, and serves as needle position detection means. In this specific example, one pulse is applied every two stitches.

〔Effect of the invention〕

As is clear from the above explanation, the present invention enables the user to freely select the rising and falling ranges of increases and decreases in the amount of sagging based on the number of stitches, and that the change is constant with respect to the number of stitches. Since multiple stitches can be incorporated during sewing, subtle texture adjustments can be easily made regardless of the skill of the worker or the fabric.

[Brief explanation of the drawing]

Figure 1 is a side view of the sewing machine, Figure 2 is a block diagram of the operating section of the sewing machine, Figure 3 is a diagram showing the locus of the upper feed dog and lower feed dog, and Figures 4 to 6 are for sleeve stitching. FIGS. 7 to 9 are flowcharts illustrating specific examples of the present invention. 1... Sewing machine body, 1'... Table, 2...
Main shaft motor, 3...V belt, 4...pulley,
5... Pedal switch, 6... Set-up command switch, 7... Upper feed drive pulse motor (drive means), 8... Lever, 8'... Rotating part, 9... Origin switch, 10... Lower Feed amount adjustment dial, 11
... Down feed detection lever, 12 ... Potentiometer, 13 ... Control box, 14 ... Central processing unit CPU (calculation means, control means), 15 ... LED drive circuit, 16a to 16e ... 1st to Fifth upper feed amount display 17a to 17d...First to fourth intermediate stitch number display, 20...Lower feed amount display, 21a to 21e
. . . 1st to 5th upper feed amount setting switch (first input means), 22a to 22d . . . 1st to 4th intermediate stitch number setting switch (second input means), 25 . . . means), 26... Upper shaft detection device, 27... Rotation signal detector, 28... Lower feed amount reading device, 29... Pitch display selection LED,
30...Pitch display switch, 31...Ratio display selection LED, 32...Ratio display switch, 33...
...Drive circuit, 34...Read/write memory RAM (storage means), 35...Battery, 36a, 36b, 36
c, 36d...Pattern setting switch.

Claims (1)

[Claims] 1. In a sewing machine having two different feed mechanisms for performing differential feed stitching, a driving means that is connected to one of the feed mechanisms to change the feed amount, and detects a specific needle position of the sewing machine. a stitch count counter for counting the number of stitches; a command means for commanding the end of a predetermined sewing section to be sewn with a constant feed amount; a first input means for inputting into a storage means; at least two or more intermediate sewing sections interposed between the sequentially set predetermined sewing sections, two or more different intermediate sewing sections sequentially corresponding to each intermediate sewing section; a second input means for inputting the number of stitches into the storage means; calculation means for calculating the feed amount for each predetermined number of stitches so that the feed amount can be gradually increased or decreased; While sewing the sewing section, the calculation means calculates the feed amount and operates the drive means to increase or decrease the feed amount to the second feed amount, and when the end of the first number of stitches is detected, the second feed amount is used to sew the predetermined sewing section. Then, when a command from the command means is detected while sewing a predetermined sewing section using the second feed amount, the intermediate sewing section is sewn using the second number of stitches, and the feed amount is calculated using the calculating means. control means that operates the drive means to increase or decrease the feed amount to a third feed amount, and repeats this by the number of feed amounts in the predetermined sewing section and the number of stitches in the intermediate sewing section input into the storage means; A cloth feed control device for a sewing machine, which is characterized by: