JPS6323693A - Feed quantity control method and apparatus of sewing machine - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a differential feed sewing machine, particularly a sewing machine having an upper feed and a lower feed mechanism. The present invention relates to a sewing machine feed rate control method and device for measuring the texture of white clay 4 in a sewing machine by changing the texture according to the number.

Conventionally, in this type of sewing machine, the operator normally adjusts the upper feed amount and the sewing amount using the pitch setting dial or the pitch setting lever, respectively, so that the amount of sagging that is suitable for the sewing material is obtained. The upper feed amount including offset was adjusted separately. Then, when the setting point 1 or higher is reached after the start of sewing, one worker operates the sub-pedal connected to the upper feed adjustment lever with his/her foot to change the upper feed amount and perform the specified setting operation. .

3 q h＜Problem to be solvedHowever, since this adjustment is operated using a foot pedal, it is actually difficult to make subtle increases or decreases in the amount of upper feed, and it is difficult to increase or decrease the amount of upper feed by hand based on the operator's experience. The upper feed amount was delicately adjusted to suit the sewn product, giving the product its texture.

Therefore, the process of creating the texture requires skill, specialized means are brought into the process, and the work of creating the texture of the texture relies on the operator's own hands, resulting in variations in texture, etc. - Even if the adjustment values on two sewing machines are the same, if the operator is different, the adjustment values cannot be used as they are and different adjustments are required, reducing work efficiency. There was a drawback.

The difference between the first feed amount and a second feed amount that is different from the first feed amount is calculated by calculating the difference between the first feed amount and the second feed amount. From the number of intermediate sewing stitches between each sewing section, calculate the feed amount for each predetermined number of stitches during intermediate sewing, determine the intermediate sewing command signal while the sewing machine is driving, and determine the needle position signal of the sewing machine. In a sewing machine that has a feed amount control method of driving a feed adjustment shaft and setting the feed mechanism to a feed amount calculated for each predetermined number of stitches, and has two different feed mechanisms for differential sewing. , a driving means connected to one of the feed mechanisms to change the feed amount; a needle position detection means for detecting a specific needle position of the sewing machine; a first feed amount of the one feed mechanism; a setting means for setting a second feed amount different from the first feed amount, and the number of stitches during intermediate sewing between each sewing section according to the second feed amount and the second feed amount; , a means for commanding the start of intermediate sewing, and a feed amount for each predetermined number of stitches during intermediate sewing based on the feed amount that is the difference between the set first feed amount and the second feed amount. and a control means for setting one feed mechanism of the two-part sewing machine to the feed amount for each predetermined number of stitches based on the inputted first feed amount, the second feed amount, or the command. A sewing machine feed rate control device is provided.

In the present invention, the normal upper feed amount or the upper feed amount for setting in is set, and the number of stitches and repulses from the normal 2nd feed to the time for setting are set by the setting switch.
° By doing this, the changes from two feeds to two feeds are automatically connected and controlled, so that if the sewn product is the same, it is not dependent on the skill of the operator, and The setting values set on one sewing machine can be used as they are on other sewing machines, making it easy to adjust the amount of creasing and making it possible to do it uniformly and quickly.5 Improved work efficiency and 1 Improved quality stability. .

Figure 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.
This rotation of the main motor 2 rotates a pulley 4 connected to the main shaft via a V-belt 3. Further, a pedal switch 5 for starting and stopping the main motor is provided at the bottom of the main motor 2, and this pedal switch 5 is also provided with a set-in command switch 6. Also, the table 2 of the sewing machine body 1
A two-feed drive pulse motor 7 for changing the upper feed amount is provided in the second part of the sewing machine, and this upper feed drive pulse motor 7 is connected to a well-known feed adjustment shaft 1a that protrudes outward from the sewing machine body 1.
The feed amount is adjusted by driving a lever 8 that is pivoted on the lever 8, and an origin switch 9 is provided on the rotating portion 8' of this lever 8 to detect the notch position of the rotating portion 8'. and output the home position of the pulse motor. 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 adjustment device 6 by rotating the lower feed amount adjustment dial 10 is connected to the sewing machine. A potentiometer 12 is provided on the second part of the origin switch 10 of the sewing machine main body, and a potentiometer 12 is further provided to convert the movement of the downward feed detection lever 11 into voltage, and a control box 13 is provided on the upper part of the sewing machine main body 1. In addition, the lower feed detection lever 1
1 is connected so that when the lower feed amount adjustment dial 10 is rotated in the downward feed amount increasing direction, that is, in the C direction, it moves in the C' force direction, and when it is rotated in the downward feed minimum decreasing direction, that is, in the D direction, it moves in the D' direction. has been done.

FIG. 2 is a block diagram of the control means for the operating section of the sewing machine according to one embodiment of the present invention. A normal upper feed amount display 16 that displays the normal upper feed amount of the normal upper feed amount, and a first stitch number display 17 that displays the number of stitches for intermediate sewing from "2nd feed to 2nd feed amount", when 2nd feed amount is used. Upper feed amount indicator 18, which displays the upper feed amount. A second stitch count display 19 for displaying the number of stitches for intermediate sewing from the top feed amount including set to the normal second feed amount, and a bottom feed amount display 20 for displaying the bottom feed amount are connected.

Corresponding to these indicators, there is also a normal upper feed fine setting switch 21 for setting the normal upper feed amount, and a first fine setting switch 21 for setting the first stitch count indicator. A stitch number setting switch 22, a fine setting switch 23 for setting the setting amount, and a second stitch number setting switch 24 for setting the second set number display are connected to the central processing unit CPt114. Furthermore, the central processing unit CPt114 performs the start of the initialization and the return of the initialization.
an upper shaft detection device 26 that outputs an upper shaft detection signal for synchronizing with the number of stitches. A rotation signal detector 2 for determining whether the rotation of the pulley 4 of the sewing machine is caused by hand rotation or by the main shaft motor 2.
7. Lower feed reading device 28 that reads the lower feed amount by capturing the voltage change of the potentiometer 12 shown in Fig. Pitch display selection L
FII) 29, pitch display switch 30 that selects this pitch display selection LEr) 29, ratio display selection 1 that displays the downward feed amount as a relative amount of - with the downward feed amount being "1".
, EI) 3], a ratio display switch 32 for selecting the ratio display selection LED 1.3 is connected to the central processing unit CPU 1.4. Further, the upper feed drive pulse motor 7 in FIG. 1 is connected via the drive circuit 33, and a read/write memory RAM 34 for storing setting contents is also connected, and the contents are stored in the read/write memory RAM 34 even after the power is turned off. A backup battery 35 is connected to prevent the power from going out. Also, a pattern setting switch 36 is used to set a plurality of offset amounts in the read/write memory RAM 34.
a, 36b, 36c, and 36d are central processing units CPU]
Connected to 4.

Next, the operation of this embodiment will be explained. First, when the power is turned on, the origin switch 9 in Fig. 1 is set to the origin (2 feed amount 2
．． If the origin switch 9 is on, it moves in the off direction (direction B), and if it is off, it moves in the on direction (
pulse motor 7 so that the signal switches to
is driven, and the passing point is set as the movement origin of the pulse motor 7 (upward feed ji 2.5 mm). After detecting the origin, read the upper feed amount displayed on the normal upper feed indicator I6 (hereinafter referred to as normal -1-feed amount), and turn the pulse motor 7 to A or A to reach this normal feed amount. Drive in direction B. When this pulse motor 7 rotates in six directions,
The upper feed lever 8 rotates in the direction of A', and the upper feed dog 37 takes an elliptical trajectory P downward from arrow A to arrow B as shown in FIG. 3, and the trajectory moves from P to P'. death.

-Feed rate adjuster (not shown) to increase the feed rate
is connected to. Note that the lower feed dog 38 moves from the bottom to the top in the direction of the arrow C.

In addition, the operator sets the target amount of sagging and number of stitches for the sewing product using the fine feed setting switch 21, the first number of stitches setting switch 22, the second fine setting switch 23, and the second
The contents inputted with the stitch number setting switch 24 are stored in the read/write memory RAM 34, and furthermore, the contents inputted with the stitch count setting switch 24 are stored in the read/write memory RAM 34, and are further changed to the normal -1 quantity, the feed amount display 16, the first stitch count display 17, and the set -1 - feed amount display 18. , is also sent to the second stitch count display I9 and the lower feed amount display 20 for display, and the pulse motor is operated so that the contents of the normal feed amount display 16 and the normal 1-feed amount are always the same. 7 to lψM.

Next, the sagging operation will be explained using sleeve stitching as an example. First, before starting sewing, the worker
The upper feed amount required for sections a-b and e-f of the armhole 41 of the sleeve 40 is displayed on the second feed amount display 16, and the number of stitches required for intermediate sewing of sections b-c is displayed on the first one. The stitch number display 17 shows c-
Feed amount display 1 indicates the required upper feed amount in section d.
8, the number of stitches required in the d-e section (during intermediate sewing) is set on the second stitch number display 19, respectively. In sections a and 7b, sewing is normally carried out according to the upward feed, and when point b is reached, the operator presses the erging command switch 25 to notify the central processing unit CPU 4 of the start of erging (intermediate sewing). 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 change in the number of stitches.
The amount of change in two feeds per needle is determined, and the amount of top feed increases or decreases for each stitch by the amount of -1-feed change determined,
The pulse motor 7 is driven in synchronization with the upper shaft detection signal from the two-shaft detection device 26 so as to start the distortion. At the 0 point after sewing the set number of stitches, the upper feed amount is -1 including the set number of stitches.
- Since the sewing machine is a feeder, keep the setting command switch 25 on and continue sewing up to point d. After sewing to point d,
When the setting command switch 25 is turned off, the central processing unit CPU 4 receives the turning off of the setting command switch 25, determines the start of intermediate sewing, and calculates the amount of decrease or increase in top feed per stitch. , 4a is produced up to point f while maintaining this determined two-feed reduction amount, and the armhole combing work is completed.

In this way, by freely selecting the number of stitches during intermediate sewing between b-c and d-e, it is possible to subtly change the change in the sagging.

In addition to the sleeve stitching as explained in the above example,
Possible applications include back yoke, cuffs attached, armpit straps, slacks armpit straps, scarf 1 hehida, hemline 3 rolls, etc. It is also possible for the normal feed amount to be greater than the 1/2 feed amount.

Regarding this embodiment, the flowcharts shown in FIGS. 5 and 6 for intermediate sewing in which the normal upper feed amount is 20 mm, the upper feed amount including skewing is 4.4 mm, and the number of upper feed increment sets is 7 stitches will be explained. A feed amount of 0.1 mm is considered as one pulse).

[1] Rotation direction check Normally - 1 - Feed amount and set-in amount 2 Subtract the feed amount and find the set-up direction based on the magnitude relationship (In this specific example, 2O-44 = -24 < O, and set-up direction is determined. (driving the amount of filling in the direction of increase).

[When checking 0 stitches for 2 needles and 0 needle breaks, 2-feed is canceled regardless of whether it is stopped or driving, without synchronizing with the 2-axis detection signal from the 2-feed detection device 26. Drive up to the feed amount (
Turn on the number of stitches O flag and set the pulse amount as a counter (1~).

Since this specific example has 7 stitches, move on to [3].

[3] Calculate the two-feed amount per stitch. Divide the absolute value of the difference between the normal two-feed amount The upper feed amount for each stitch is calculated by calculating the upper feed amount for each stitch and distributing the remainder evenly. For example, let the quotient be PN and the remainder be RP.

bawl. These determined values are stored in areas NCT, PNCT, RPCT, and 5CCT of read/write memory RA old 4, respectively.

[4] Check the -1-axis detection signal from the pulse motor drive timing upper shaft detection device 26 and the sewing machine rotation signal from the sewing machine rotation signal detector 27. By driving the main motor 2, the upper feed amount is moved only when a two-axis detection signal is input.

This realizes an increase in the amount of sagging corresponding to the number of stitches.

[5] Pulse amount PN per stitch is measured by pulse counter PCT.
After completing the operation of HESET [4], set the amount of pulse change per stitch in the pulse counter PCT (in this example, [
3” is set).

[Check of 61 surplus pulses RP Check the value of the area RPCT of the read/write memory RAM 14 that stores the surplus pulses RP, and if it is other than 0, distribute the surplus pulses uniformly within the number of stitches N by the skip counter (SC).

[7] Subtract 1 from the value of the skip counter SC for each stitch of distribution of residual repulse RP,
When the value of the skip over counter SC reaches O, the value of the remaining pulse RP is added by 1 to the pulse counter PCT. As a result, the remaining pulses RP are uniformly distributed.

In this specific example, the remainder of 3 pulses is distributed for every 2 stitches,
When the number of stitches is 1-13.5, movement is performed in 4 pulses.

After completing the operations in [1] to [7], the pulse motor is driven to increase the amount of sagging corresponding to the number of stitches.
A reduction can be made.

Furthermore, this embodiment is equipped with a lower feed amount reading device 28 that detects the movement of the lower feed detection lever 11 as a change in the voltage of the potentiometer. Display is also downward feed indicator 11
can be displayed. Further, this downward feed amount can be easily determined by the pitch display LEr 129 that directly displays the 1 normal speed amount, the uneven feed amount, and the downward feed amount. Also, the pitch display IED2 is the one that displays it! ] or ratio display LEn3].

In this way, in this embodiment, the range of increase/decrease in the amount of distortion can be freely selected depending on the number of stitches, and since the change is constant with respect to the number of stitches, it is possible to create subtle textures. can be easily adjusted regardless of the skill of the worker or the fabric, and the voltage of the potentiometer in contact with the lower feed lever 11 connected to the lower feed amount adjustment dial 10 can be used to increase or decrease the lower feed amount. By displaying this as a ratio to the second feed amount, it is possible to adjust the offset amount regardless of the pitch of the lower feed amount.

Also, "normal" 2nd feed amount, 1st number of stitches, upper feed amount including set,
Since the contents of the second number of stitches are stored in the read/write memory RAM 14, this allocation to the read/write memory RAM 14 makes it possible to store a plurality of contents. Previously, it was necessary to adjust the setting dial or lever, but in this example, by inputting -degrees, the call-up is a one-key operation, so even beginners can easily perform the adjustment work that suits the sewing product or process. can be done.

In the above embodiment, the pulse motor is replaced by a servo motor, and the read/write memory RAM is replaced by a digital switch.
The two-axis detection signal is converted to the number of sheets or multiple pulse signals synchronized with the rotation of the machine, and each setting value of "normal" - feed amount and upper feed amount including "normal" - feed and -17 = "including setting" is used. - To change the feed area, the first and second numbers of stitches may be set to a number of pulses synchronized with the rotation of the sewing machine.

Furthermore, although this embodiment has been described with reference to the case where it is installed on a sewing machine with a vertical differential feed mechanism that can be set in place, other types of differential feed sewing machines, for example, where the feed dogs are arranged back and forth in the cloth feeding direction, have been described. , the sewing machine may be equipped with a separate feed mechanism to control the feed amount of each. In other words, based on the main feed amount by the main feed mechanism placed at the front in the feed direction,
The amount of sub-feed by the sub-feed mechanism can also be controlled by this device.

For example, when gearing is performed using a differential sewing machine, if the sewn shape includes a curve, the differential feed paper must be adjusted according to the curvature while sewing.

At this time, sewing using the differential feed amount and sewing with large curvature (
This device can be used for intermediate sewing between sewing using a differential feed amount (small).

Further, the cloth feeding means of the sewing machine equipped with this device is not limited to the above-described type in which the feed dog moves the cloth feeding tJJ;
Any sewing machine capable of differential feeding, such as a means for feeding cloth using rotating rollers, can be controlled by installing this device.

q-! As is clear from the above explanation, the present invention allows the user to freely select the rise and fall ranges of the increase/decrease in the amount of stitches depending on the number of stitches, and the change is constant with respect to the number of stitches. , subtle texture adjustments can be easily made regardless of the worker's skill or the fabric, and the voltage of the potentiometer in contact with the bottom feed lever connected to the bottom feed amount adjustment dial can be used to increase or decrease the bottom feed amount. By displaying this as a ratio to the top feed amount,
There is an advantage that the amount of set-in can be adjusted regardless of the pitch of the downward feed amount.

[Brief explanation of drawings]

Figure 1 is a side view of a sewing machine according to an embodiment of the present invention, Figure 2 is a block diagram of the operating section of a sewing machine according to an embodiment of the present invention, and Figure 3 shows the trajectory of the upper feed dog and lower feed dog. The illustrated figures, FIG. 4, are operation explanatory diagrams for explaining the erging operation of this embodiment by taking armhole stitching as an example, and FIGS. 5 and 6 are flowcharts for explaining the present invention in detail. l...Sewing machine body, 1'...Table, 2...Main shaft motor, 3...V belt, 4...Pulley, 5...
...Pedal switch, 6...Ise-in command switch,
7...”-feed drive pulse motor, 8... lever,
8'...Rotating part, 9...Origin switch, 10...
Lower feed amount adjustment dial, 11...lower feed detection lever,
12... Potentiometer, I3... Control box, 14... Central processing unit CPU, 15... LEDI
I movement circuit, 16...Normal" - Feed amount indicator, 17...
・1st stitch number indicator, ]8...Includes 2nd feed amount indicator, 19...2nd stitch number indicator, 20...Lower feed amount indicator, 21...Normal -1-Feed amount setting switch,
22...First number of stitches setting switch, 23...Set-up amount setting switch, 24...Second number of sets setting switch, 25...Set-up command switch, 26...Upper shaft detection Device, 27... Rotation signal detector, 28... Lower feed amount reading device, 29... Pitch display selection LED, 3
0...Pitch display switch, 31...Ratio display selection LED, 32...Ratio display switch, 33...Drive circuit, 34...Read/write memory RAM, 35.i.Battery, 36a, 36b, 36c, 36d--Pattern setting switch. Applicant: Tokyo Heavy Equipment Industry Co., Ltd. Engraving of drawings (contents (no changes)) Engraving of drawings of Figure 1 (no changes to contents) 3q40 Voluntary procedure amendment June 6, 1986

Claims (2)

[Claims] (1) Perform differential feeding with the sewing machine to obtain the first feed amount,
The difference between this first feed amount and a different second feed amount is calculated, and from the intermediate number of sewing stitches between each sewing section by the first feed amount and the second feed amount, this intermediate Calculates the feed amount for each predetermined number of stitches during sewing, determines the intermediate sewing command signal while the sewing machine is driving, determines the needle position signal of the sewing machine, and calculates the feed amount for each predetermined number of stitches by driving the feed adjustment shaft. A sewing machine feed rate control method that sets the feed mechanism to the specified feed rate. (2) In a sewing machine that has two different feed mechanisms for differential stitching, a drive means that is connected to one of the feed mechanisms to change the feed amount, and a needle position detector that detects a specific needle position of the sewing machine. means, and a first of said one feeding mechanism.
a second feed amount different from the first feed amount;
a setting means for setting the number of intermediate sewing stitches between each sewing section using the first feed amount and the second feed amount; a means for instructing the start of the intermediate sewing; means for determining the feed amount for each predetermined number of stitches during intermediate sewing based on the feed amount that is the difference between the first feed amount and the second feed amount; 1. A feed amount control device for a sewing machine, comprising: a control means for setting one feed mechanism of the sewing machine to a feed amount or a feed amount for each predetermined number of stitches according to the command.