JP3266733B2 - Sewing machine feed amount control method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for controlling a feed amount of a sewing machine provided with first and second cloth feeding means.

[0002]

2. Description of the Related Art Conventionally, a differential feed sewing machine having first cloth feed means (for example, upper feed dog) and second cloth feed means (for example, lower feed dog) has been used to control the feed amount. For example, there is a technique disclosed in Japanese Patent Application No. 4-86433 proposed by the present inventor as an apparatus for performing a shirring operation.

[0003] In this technique, first, for the lower feed dog,
A constant lower feed amount is set as the cloth feed pitch, and an upper feed amount and a shirring upper feed amount are usually set for an upper feed drive motor (pulse motor) for driving the upper feed dog. Also, the sewing section A normally driven by the upper feed amount
Then, a sewing section C driven by the garment upper feed amount and intermediate sewing sections B and D between the sewing sections A and C are set.

In the intermediate sewing sections B and D, the normal upper feed amount of the sewing section A is changed to the garment upper feed amount of the sewing section C, or vice versa. It is necessary to gradually change the upper feed amount so that the normal upper feed amount in the sewing section A is obtained. That is, in the intermediate sewing sections B and D, it is necessary to sequentially increase or decrease the upper feed amount for each stitch and change the same.
Based on the section length (for example, 1 cm) of the intermediate sewing section B,
The upper feed amount is calculated for each unit length (for example, 1 mm) in D to control the pulse motor that drives the upper feed dog.

[0005]

However, when the rotation speed of the motor of the sewing machine is increased and the cycle time of the calculation is shortened, or when the upper feed amount of the upper feed dog and the upper feed amount of the shirring are reduced. When the difference between the two becomes a large set value, and as a result, the number of command pulses per one time becomes large,
There is a problem in that the rotation of the pulse motor for the number of previous command pulses is not completely executed even when the next calculation processing time is reached. Therefore, there is a fear that the command pulse for the unrotated portion disappears, or a step-out phenomenon occurs due to generation of an unreasonable command pulse interval.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and performs suitable control of a pulse motor even if the rotation speed of the sewing machine motor increases or the number of command pulses increases. It is an object of the present invention to provide a method of controlling a feed amount of a sewing machine and a device therefor.

[0007]

According to a first aspect of the present invention, a difference between a first feed amount and a second feed amount different from the first feed amount is determined, and the difference between the first feed amount and the second feed amount is determined. Based on the section length of the intermediate sewing section between the sewing section and the sewing section with the second feed amount, during this intermediate sewing section,
In the feed amount control method for a sewing machine, which calculates a feed amount for each unit length and drives a pulse motor using the feed amount for each unit length to perform differential feed of the sewing machine, At the time of calculating the amount, the remaining pulses of the previous command pulse of the pulse motor are accumulated, the sewn dimensions of the intermediate sewing section are determined by the intermediate sewing instruction signal, and the unit length is determined based on the sewn dimensions. The gist of the present invention is a sewing machine feed amount control method in which the accumulated feed amount is set to a pulse motor every time.

According to a second aspect of the present invention, when calculating the feed amount for each unit length, the remaining pulses of the previous command pulse of the pulse motor are accumulated and the pulse motor pulse interval data is used as the pulse interval data. The gist of the present invention is a method for controlling a feed amount of a sewing machine, wherein pulse interval data at the time of arithmetic processing is adopted.

The invention according to claim 3 is, as illustrated in FIG.
The first cloth feeding means, the second cloth feeding means different therefrom, by changing the feed amount of the first cloth feeding means relative to the feeding amount of the second cloth feeding means, A pulse motor for increasing / decreasing the amount of shirring, a feed amount control device for a sewing machine, comprising: a first feed amount and a second feed amount different from the first feed amount for the first cloth feed means. Amount setting means, section length setting means for setting a section length of a sewing section by the first feed amount, a sewing section by the second feed amount, and an intermediate sewing section between the two sections; Using a difference between the first feed amount and the second feed amount, based on a section length of the intermediate sewing section, a feed amount calculating means for calculating a feed amount for each unit length during the intermediate sewing section; and Even when the time of the arithmetic processing is reached, the instruction has already been issued by the previous arithmetic operation. If the output of the number of pulses has not been completed, the remaining pulses of the previous command pulse are cumulatively processed at the time of the arithmetic processing for each unit length, and the pulse interval data at the time of the arithmetic processing is adopted as the pulse interval data. Cumulative calculation means, sewing size calculation means for calculating the already sewn dimensions, intermediate sewing command means for instructing the start of the intermediate sewing section, and after receiving the command of the intermediate sewing command means, during the intermediate sewing section, Based on the sewn dimensions calculated by the sewing size calculating means, every time the unit length is sewn, the feed amount and the pulse interval data calculated by the cumulative calculating means are sent to the pulse motor at any time. A feed amount control device for a sewing machine, comprising: a feed amount control unit;

[0010]

According to the first aspect of the present invention, the difference between the first feed amount (for example, a normal upper feed amount) and the second feed amount (for example, a shirring upper feed amount) is obtained. The length of an intermediate sewing section (for example, sewing sections B and D) between the sewing section (for example, sewing section A) using the first feed amount and the sewing section (for example, sewing section C) using the second feed amount. During this intermediate sewing section, the feed amount is calculated for each unit length, and the pulse motor is driven using the feed amount for each unit length to perform the differential feed of the sewing machine. When such a differential feed is performed, the remaining pulses of the previous command pulse of the pulse motor are accumulated during the calculation of the feed amount for each unit length, and the intermediate sewing interval is determined by the intermediate sewing instruction signal. Is determined, and the accumulated feed amount is set in the pulse motor for each unit length based on the sewn dimensions.

That is, according to the present invention, the remaining pulses of the previous command pulse are accumulated and the accumulated feed amount is set as the current feed amount of the pulse motor, so that the previously unexecuted command pulse disappears. It is possible to prevent the occurrence of a step-out phenomenon caused by setting an unreasonable command pulse interval.

In the feed amount control method for a sewing machine according to a second aspect of the present invention, when the feed amount is calculated for each unit length, the remaining pulses of the previous command pulse of the pulse motor are accumulated, and the pulse motor pulse is controlled. Since the pulse interval data at the time of the arithmetic processing is adopted as the interval data, the pulse interval is properly maintained, and the step-out phenomenon can be more appropriately prevented.

In the feed amount control device for a sewing machine according to a third aspect of the present invention, the feed amount of the first cloth feed means is relatively changed with respect to the feed amount of the second cloth feed means by a pulse motor. With this, the amount of shirring is increased or decreased to perform the boring work. Then, the first feed amount and the second feed amount of the first cloth feed unit are set by the feed amount setting unit, and the sewing section and the second feed amount by the first feed amount are set by the section length setting unit. The section length between the sewing section and the intermediate sewing section is set based on the amount. The feed amount calculating means calculates the feed amount for each unit length during the intermediate sewing section based on the section length of the intermediate sewing section using the difference between the first feed amount and the second feed amount. . Further, if the output of the number of pulses already instructed by the previous calculation has not been completed even at the time of the arithmetic processing, the accumulative arithmetic means performs the arithmetic processing for each unit length by the accumulative arithmetic means. The remaining pulses are accumulated, and pulse interval data at the time of arithmetic processing is adopted as pulse interval data. When the start of the intermediate sewing section is instructed by the intermediate sewing instruction means, the unit length is sewn by the feed amount control means based on the sewn dimensions calculated by the sewing dimension calculating means during the intermediate sewing section. Each time, the feed amount and the pulse interval data calculated by the accumulating means are commanded to the pulse motor as needed.

That is, according to the present invention, after the sewing of the intermediate sewing section in the garment operation is started, the feed amount and the pulse interval data calculated every time the unit length is sewn are converted into the pulse motor based on the sewn dimensions. Command at any time, the control of the pulse motor in the intermediate sewing section can be suitably performed without problems such as disappearance of the command pulse and step-out.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the feed amount control device of the present invention is incorporated in a differential feed sewing machine will be described below with reference to the drawings. The sewing machine 1 according to the present embodiment mainly includes a sewing machine main body 3 and a shirring control box 5. Hereinafter, each component will be described in detail. FIG. 2 is a front view of the present embodiment, and FIG. 3 is a right side view of the same.

The sewing machine main body 3 is set on a table 7. On the right side of the sewing machine main body 3, a drive pulley 9 capable of driving an upper shaft (not shown) is provided. The drive pulley 9 rotates via a V-belt 11 in synchronization with the rotation of a sewing machine motor 13 fixed below the table 7. The rotation of the sewing machine motor 13 is controlled by the depression pedal 1.
5 is controlled by the motor control box 17 according to the depression amount (see FIG. 3).

The sewing machine main body 3 has an upper feed dog 19
(See FIG. 2), and a table 7 is provided.
A cloth feed mechanism for the lower feed dog 21 (see FIG. 2) is provided inside. The cloth feed mechanism of the upper feed dog 19 is capable of adjusting the feed amount of the upper feed dog 19 via an upper feed amount adjusting shaft 35 by a pulse motor 31 described later. On the other hand, a cloth feed mechanism of the lower feed tooth 21 is provided with a lower feed amount adjusting dial 23 described later.
The downward feed amount is fixed to the set value of. Incidentally, since both cloth feeding mechanisms are well-known as shown in, for example, Japanese Patent Publication No. 2-25638, detailed description thereof will be omitted.

The sewing machine main body 3 is provided with a downward feed amount adjusting dial 23 for setting the downward feed amount. The lower feed amount adjusting dial 23 is provided with a lever shaft 25 interlocked with the rotation of the dial 23. The lever shaft 25 is connected to a potentiometer 29 via a potentiometer lever plate 27a and a lever 27b. Therefore, the output voltage of the potentiometer 29 changes according to the rotation of the lower feed amount adjustment dial 23.

Further, a pulse motor 31 for changing and setting the upper feed amount is provided on the upper rear surface of the sewing machine main body 3. The pulse motor 31 includes a pulse motor lever 3
The upper feed amount can be adjusted by being connected to the upper feed amount adjusting shaft 35 via 3. Also, as shown in FIG.
An origin lever 37 is connected to the rotation axis of the pulse motor 31, and the origin switch 39 is turned on to output the origin position.

An operation panel 41 is provided above the sewing machine main body 3.
In addition, as shown in FIG. 2, a shirring switch 43 is provided on the left side surface of the sewing machine main body 3.
Further, below the table 7, there is provided a shampoo interruption switch 45.
Is provided. These are each connected to the shirring control box 5 below the table 7.

The shirring switch 43 and the shirring interruption switch 45 are both automatic return type switches, and generate a command signal when the switches are pressed. As shown in FIG. 4, the operation panel 41 has a normal upper feed amount indicator 47 for displaying the normal upper feed amount, a shirring upper feed amount indicator 49 for displaying the shirring upper feed amount, and a lower feed amount. A lower feed amount display 51 for displaying the feed amount set by the adjustment dial 23, and a section length display 53 for displaying a section length of a sewing section set by a changeover switch described later.
Is provided. Further, an increase / decrease switch 47a for increasing / decreasing the normal upper feed amount, an increase / decrease switch 49a for increasing / decreasing the shirring upper feed amount, and an increase / decrease switch 53a for increasing / decreasing the sewing section length are provided.

Further, there are provided a changeover switch 55 for switching the sewing section, and a sewing section display 57 for displaying a graph showing the name of the sewing section currently being sewn and the feed amount of each sewing section. Indicators 57a, 57b, 57c, 5
7d shows that the current sewing section is the sewing section A, B,
C and D. These indicators 57a, 57b, 57c, 57d
Each time is turned on, it is sequentially turned on. The section length display 53 indicates which sewing section the section length is displayed on by the lighted portions of the indicators 57a, 57b, 57c, 57d. Therefore, the section lengths of the sewing sections A, B, C, and D can be individually set by using both the changeover switch 55 and the increase / decrease switch 53a.

Next, a control circuit 60 provided in the storm control box 5 will be described with reference to FIG. FIG. 5 is a block diagram schematically illustrating the circuit configuration of the present embodiment. The control circuit 60 includes, as external devices, the operation panel 41, the shirring switch 43, and the shirring interruption switch 45, as well as a pulse motor 31 for adjusting an upper feed amount via a motor driver 61, and a pulse motor 31 for the pulse motor 31. Origin switch 39 for detecting the origin, A / D converter 63
Potentiometer 2 for detecting the downward feed amount via
9, and a motor control box 17 for driving the sewing machine motor 13 based on an encoder 65 that outputs a pulse train synchronized with the upper axis of the sewing machine. The sewing machine 1 is set so as to sew one stitch every time the encoder 65 outputs 24 pulses.

The control circuit 60 includes an I / O interface 67 for inputting and outputting signals to and from the external device, and a central processing unit (CP) for performing various arithmetic processing.
U) 69, a read-only memory 71 (ROM) storing a program to be used in the shrinking process described later, a random access memory 73 (RAM) for temporarily storing various data, and a permanent storage for various data. This is a well-known electronic control circuit mainly including an electrical erase programmable read only memory 75 (EEPROM).

Next, the operation of the shirring process of this embodiment will be described with reference to the flowcharts of FIGS. In the following description, it is assumed that each set value is set to a numerical value shown in Table 1 below so that the operation can be easily understood.
The feed amount indicates the amount by which the cloth is fed per stitch. Table 1 also shows abbreviations.

[0026]

[Table 1]

The shirring process is started by turning on the power. First, it is determined whether or not the pulse motor 31 is at the origin (S101). If at the origin (S101
, "YES"), forward rotation of 20 pulses (S102), and then proceeds to S104. Here, the forward rotation refers to the upward feed increasing direction. On the other hand, if it is not at the origin (“N
O "), performs 10-pulse normal rotation (S103), and then S1
Go to 04. In S104, the pulse motor 31 is rotated reversely one pulse at a time. It is determined whether the origin switch 39 has been turned on while the reverse rotation is continuing (S105), and if not turned on ("NO" in S105), the process returns to S104 again.
If it is turned on ("YES" in S105), the rotation of the pulse motor 31 is stopped at that point, and the pulse motor counter is cleared (S106).

Next, the upper feed amount is usually set to 0.1.
mm is set as one unit (S107). In this embodiment, since the upper feed amount is usually 2.0 mm, "20"
Is set as And the shampoo switch 4
It is determined whether or not 5 is turned on (S108). It should be noted that the case where the shirring interruption switch 45 is turned on ("YES" in S108) will be described later.
A case where the switch is not turned on ("NO" in S108) will be described.

If the shirring interruption switch 45 has not been turned on ("NO" in S108), then it is determined whether or not the shirring switch 43 has been turned on (S10).
9). If the shirring switch 43 is not turned on ("NO" in S109), the process returns to S108 again. Therefore, normal sewing by the depressing pedal 15 is performed until the shirring switch 43 is turned on. Here, normal sewing means sewing in which the upper feed dog 19 is driven at a normal upper feed amount, here, 2.0 mm.

On the other hand, if the shirring switch 43 is turned on ("YES" in S109), it is determined whether the current sewing section is the sewing section A or C (S110), and the sewing section A or C is determined. If not (“NO” in S110), the process returns to S108 again. If it is the sewing section A or C (S11
If “0” is “YES”, the process proceeds to S111.

If it is determined in step S110 that the sewing section is the sewing section A, the section length of the sewing section B is set in the section length down counter.
If it is the sewing section C in S110, the section length of the sewing section D is set (S111). The unit of the section length set in the section length down counter is 0.1 mm. In this embodiment, since the section length of the sewing section B is 1.0 cm, the counter number is set to "100".

Thereafter, a loop process is executed from the next process. This loop processing is repeated until the number of section length down counters becomes zero. First, the lower feed amount is read as DNS and stored in the memory (S201). D at this time
The unit of NS is 0.1 mm. In this embodiment, since the downward feed amount is 2.0 mm, DNS is stored as "20". Next, it is determined whether or not the number of pulse inputs by the encoder 65 is a multiple of 12 pulses (12n, n is an integer) (S202). If the number of pulse inputs is not 12n ("NO" in S202), the process returns to S201. Return to
If the number of pulse inputs is 12n (“YE
S "), a value obtained by subtracting DNS / 2 from the number of section length down counters is newly set as the number of section length down counters (S2).
03). In the present embodiment, DNS / 2 is “10”.

Next, the number of command pulses to the pulse motor 31 is calculated according to the value of the section length down counter number. That is, first, the magnitude relationship between the normal upper feed amount and the shirred upper feed amount is determined (S204). If the shirred upper feed amount is larger ("YES" in S204), then, in the sewing section B, It is determined whether or not there is (S205). here,
If it is determined that the sewing section is the sewing section B (“YE
S "), to set the rotation direction flag CW_CCW to" 1 "in order to set the rotation of the pulse motor 31 in the upward feed increasing direction,
The number of command pulses to the pulse motor 31 is calculated by the following equation (1) (S206). In this embodiment, since the upper feed amount is normally 2.0 mm and the shirring upper feed amount is 4.2 mm, “YES” in S204 and “YES” in S205.
In S206, the number of designated pulses is calculated by the following equation (1). One pulse of the pulse motor 31 corresponds to a feed amount of 0.05 mm.

[0034]

(Equation 1)

PM_PLS: Number of command pulses to pulse motor PM_TCNT: Number of pulse motor counters UPS: Normal upper feed amount GAS: Shirring upper feed amount SEC_INI: Section length of sewing section SEC_CNT: Section length down counter number INT: Integer correction function (The numerical values of UPS, GAS, SEC_INI, and SEC_CNT are displayed with 0.1 mm as 1.) As described later, the number of designated pulses is the number of pulses (determined by calculation) to be output to the pulse motor 31. However, not all of the indicated pulse numbers are actually executed, and the number of unexecuted pulses (the number of remaining pulses REM_PL
S) may occur. On the other hand, the pulse motor counter number is obtained by accumulating the pulse numbers actually output to the pulse motor 31.

On the other hand, if it is determined in S205 that it is not the sewing section B ("NO" in S205), "0" is set in the rotation direction flag CW_CCW in order to set the rotation of the pulse motor 31 in the upward feed decreasing direction, The number of command pulses to the pulse motor 31 is calculated by the following equation (2) (S20)
7).

[0037]

(Equation 2)

In the case where the normal upper feed amount is larger than the shirred upper feed amount ("NO" in S204), although not illustrated here, the rotation direction of the pulse motor 31 is set by a procedure similar to S206 to S207. Then, the calculation of the instruction pulse number is executed (S208).

Next, it is determined whether or not the instruction pulse number thus calculated is "0" (S209). If the instruction pulse number is "0"("YES" in S209), the pulse motor The process proceeds to S216 without instructing S31. On the other hand, when the instruction pulse number is not “0” (“NO” in S209), the pulse motors 31 for the previous instruction pulse number are used.
It is determined whether or not the driving process has been completed, that is, whether or not the previous rotation command has already been completed when the current instruction pulse number is newly calculated, based on whether or not the remaining pulse number (REM_PLS) is present. (S210).

The number of remaining pulses indicates the number of unexecuted pulses obtained by subtracting the number of already executed pulses from the calculated number of designated pulses. As shown in the flowchart of FIG. It is calculated by an interrupt process started for each pulse. That is, by the interrupt process of FIG. 8 started for each pulse, one is subtracted from the number of remaining pulses by one (S400), and a drive signal for one pulse is output to drive the pulse motor 31 (S401). ). next,
The next pulse interval data is set by calculating from the number of remaining pulses (S402), and the process is once terminated.

Returning to FIG. 7, if it is determined in S210 that the rotation command has already been completed (“YE” in S210).
S "), in order to check the execution state of the designated pulse number, the designated pulse number is set as the remaining pulse number (S2).
13) The pulse interval data is initialized (pulse interval data when the motor is started from the stop) and set (S214), and the number of remaining pulses (in this case, the number of designated pulses) for the pulse motor 31 is set for the pulse motor 31. A rotation command is issued (S215).

On the other hand, if it is determined in S210 that the rotation command is still being continued ("NO" in S210), the process proceeds to S210.
The remaining pulse number, which is the number of unexecuted pulses at the current stage, is added to the command pulse number calculated in 206, S207, and S208, and is newly set as the remaining pulse number (S21).
1) The pulse interval data currently being rotated is reset as pulse interval data as it is (S212), and the number of remaining pulses is supplied to the pulse motor 31 (S21 in this case).
A rotation command for the number of remaining pulses set in step 1 is issued (S2).
15).

Then, the number of section length down counters is "0".
Until the process is repeated, the processes of S201 to S215 are repeated (S201
216). In the sewing section B, Table 2 below shows the results of calculations performed by the series of loop processes S201 to S216 as needed.

[0044]

[Table 2]

The upper feed amount in Table 2 is obtained by multiplying the sum of the pulse motor counter number and the instruction pulse number by the feed amount for one pulse (0.05 mm). This shows the integrated value of the upward feed amount when executed. Here, the main part of the processing of this embodiment will be described in detail with reference to Table 2.

For example, the value in the fourth column of the designated number of pulses in the fourth row of Table 2 is "5". Therefore, if the pulse motor 31 is operating normally, the value in the fifth column of the pulse motor counter number in the third row is changed from “5” to the value “48” in the fourth column of the pulse motor counter number. Add "48 + 5 =
53 ". However, actually, the value of the fifth column of the pulse counter number is “52”, which indicates that the remaining pulse number (which is the number of unexecuted pulses) is only the value “1” of the fifth column. . At this time, the value of the fourth column of the up feed amount in the sixth row is the value “48” of the fourth column of the pulse motor counter number and the value “5” of the fourth column of the instruction pulse number.
The value "2.65" is obtained by multiplying the sum "53" of the above by the feed amount "0.05" for one pulse. is there.

Therefore, in the present embodiment, in the processing of the current time (fifth column), a value “5” obtained by adding the remaining pulse number “1” to the command pulse number “4” calculated this time is newly added to the current pulse number. The number of pulses to be output to the motor 31 is set. As a result, the number of pulse motor counters in the next (sixth column) is “57”, and the number of pulse counters in this time is “52”.
"52 + 4 + 1 = 5" which is equal to a value obtained by adding the command pulse number "4" calculated this time and the remaining pulse number "1".
7 ". The upper feed amount at this time is calculated as “(52 + 4)
× 0.05 = 2.8 ”, but the actual upper feed amount is“ 2.85 ”because there is actually the remaining pulse number“ 1 ”. That is, by controlling the pulse motor 31 in this manner, the adjustment of the feed amount can be suitably performed without deviation.

Referring back to FIG. 6, when the sewing section B is completed and the sewing section C is reached, the process returns to S108. At this time, the pulse motor 31 is driven to the upper feed amount. Here, unless the shirring interruption switch 45 is turned on ("NO" in S108), in the sewing section C, S1
08 → S109 (→ S110) → S108...

On the other hand, when the shirring interruption switch 45 is turned on ("YES" in S108), it is determined whether or not the current sewing section is the sewing section C (S301). If it is not the sewing section C ("NO" in S301), the process returns to S108 again. If it is the sewing section C ("YES" in S301), it is determined whether the upper feed amount is the normal upper feed amount (S30).
2). If the upper feed amount is not the normal upper feed amount ("NO" in S302), the upper feed amount is changed to the normal upper feed amount (S30).
3), and then return to S108. On the other hand, if the upper feed amount is the normal upper feed amount ("YES" in S302), the upper feed amount is changed to the indented upper feed amount (S304), and then S10
Return to 8.

According to the shirring interruption process, when the shirring interruption switch 45 is turned on in the sewing section C, the shirring operation is temporarily interrupted, and the normal sewing operation is performed. That is, when the shirring interruption switch 45 is turned on during the shirring work, the upper feed amount is changed to the normal upper feed amount (S303). The amount remains as it is (“YES” in S302), and the normal sewing operation is performed.
When the shirring interruption switch 45 is turned on again, the shirring work is restarted (S305). This process, for example,
In the sleeve sewing step, it is useful when, for example, an operation is performed such that only the top portion is not burred and other portions are burred.

Next, when the shirring switch 43 is turned on at the end of the sewing section C ("YE" in S109).
S ")," YES "is determined in S110, and the sewing section D
Move to Subsequently, in S111, the section length of the sewing section D is set to the section length down counter number. In this embodiment, since the section length of the sewing section D is 1.0 cm, the number of section length down counters is set to “100”.
Then, as described above, the loop processing S201 to S21
Perform Step 6.

In this manner, the sewing sections A, B, C, D
Is completed in one cycle. The effects of the embodiment described above will be described below. (1) In the present embodiment, when performing the shirring work by the drive control of the pulse motor 31, the remaining pulse number of the previous command pulse number is accumulated and the accumulated feed amount is used as the current pulse motor Since it is set as a new feed amount of 31, the previous non-executed command pulse can be prevented from disappearing. In addition, it is possible to prevent the step-out phenomenon caused by setting the command pulse interval unreasonably. (2) Particularly, in the present embodiment, the pulse interval data at the time of the arithmetic processing is adopted as the pulse interval data of the pulse motor 31 at the time of the arithmetic operation of the feed amount for each unit length, so that the pulse interval is appropriately maintained. In this respect, the step-out phenomenon can also be suitably prevented. (3) Therefore, even if the rotation speed of the sewing machine motor 13 increases or the number of command pulses increases, the pulse motor 31 can be suitably controlled to easily and accurately perform the burring operation. it can.

Here, the correspondence between the constituent elements of this embodiment and the constituent elements of the third aspect of the present invention will be described. In this embodiment, the upper feed teeth 19 correspond to the first cloth feeding means, the lower feed teeth 21 correspond to the second cloth feeding means, and the pulse motor 31 corresponds to the driving means. The increase / decrease switches 47a, 49a, 53a and the changeover switch 55 on the operation panel 41 correspond to the section length setting means and the feed amount setting means, and the shirring switch 43 corresponds to the intermediate sewing instruction means.

Further, the potentiometer 29 and the encoder 65 correspond to sewing size calculating means, and the control circuit 60 in the shirring control box 5 corresponds to feed amount calculating means, accumulating calculating means and feed amount controlling means. Further, S201 to S203 in the flowchart of FIG. 7 correspond to the processing of the sewing size calculating means, S204 to S208 also correspond to the processing of the feed amount calculating means, S209 to S214 similarly correspond to the accumulating calculating means, and similarly S215. Corresponds to the processing of the feed amount control means.

In this embodiment, the normal upper feed amount corresponds to the first feed amount, and the shirring upper feed amount corresponds to the second upper feed amount. Further, the sewing section A corresponds to a sewing section using the first feed amount, the sewing section C corresponds to a sewing section using the second feed amount, and the sewing sections B and D correspond to the intermediate sewing sections.

It should be noted that the present invention is not limited to the above-described embodiment at all, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention. For example, in this embodiment, a cloth feeding mechanism using a feed dog is employed as the cloth feeding means, but another mechanism may be used. For example, any machine capable of driving the cloth guide plate to feed the cloth, a means to feed the cloth by a rotating roller, or the like can be used as long as it is a sewing machine capable of differential feeding.

Further, in this embodiment, when the shrinking switch 43 is turned on in the sewing section A, the sewing section C is shifted from the sewing section A to the sewing section C via the sewing section B, and the shirring switch 43 is again turned on in the sewing section C. Although the program is set so that when it is turned on, the program shifts from the sewing section C to the sewing section D, other programs may be used. For example, when the fake switch is turned on in the sewing section A, the sewing section A shifts to the sewing section B, and subsequently, according to the set value on the operation panel,
The program may be set so as to shift to the sewing section C and the sewing section D by the output pulses of the potentiometer and the encoder. Also, by simply inputting the start of sewing, the section length that has been sewn is obtained by the potentiometer and the output pulse of the encoder in accordance with the set value of the section length of each of the sewing sections A, B, C, and D. The program may be set so as to issue the squeezing command signal. At this time, the shirring switch 43 becomes unnecessary.

In this embodiment, the sewing machine main body 3 and the shirring control box 5 are integrated with the sewing machine 1. However, the sewing machine main body 3 and the shirring control box 5 are separated from each other. The embedding control may be performed using a computer as an external device.

[0059]

As is apparent from the above description,
According to the first aspect of the present invention, the remaining pulses of the previous command pulse are accumulated and the accumulated feed amount is set as the current feed amount of the pulse motor. It is possible to prevent the occurrence of the step-out phenomenon due to the prevention and the setting of the excessive command pulse interval.
Therefore, even if the rotation speed of the sewing machine motor increases or the number of command pulses increases, there is a remarkable effect that the pulse motor can be suitably controlled.

According to the second aspect of the present invention, at the time of calculating the feed amount for each unit length, the remaining pulses of the previous command pulse of the pulse motor are accumulated and processed as pulse interval data of the pulse motor. Since the pulse interval data is employed, the pulse interval can be appropriately maintained, and the step-out phenomenon can be more appropriately prevented.

According to the third aspect of the present invention, after the sewing operation of the intermediate sewing section in the garment operation is started, the feed amount and the pulse interval data calculated every time the unit length is sewn are converted into pulse signals based on the sewn dimensions. Since a command is issued to the motor at any time, the control of the pulse motor in the intermediate sewing section can be suitably performed without problems such as disappearance of the command pulse and step-out.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating the configuration of the present invention.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a right side view of the present embodiment.

FIG. 4 is an explanatory diagram of an operation panel according to the present embodiment.

FIG. 5 is a block diagram schematically showing a circuit configuration of the present embodiment.

FIG. 6 is a flowchart illustrating a process according to the present exemplary embodiment.

FIG. 7 is a flowchart illustrating a process according to the present exemplary embodiment.

FIG. 8 is a flowchart illustrating an interrupt process according to the present embodiment.

[Explanation of symbols]

1 ... sewing machine 3 ... sewing machine main body 5 ... shirring control box 1
3 ... sewing machine motor, 19 ... upper feed dog,
21: lower feed dog, 23: lower feed amount adjustment dial, 29: potentiometer,
31 ... pulse motor, 41 ...
Operation panel, 43 ... Immersion switch,
45 ... Irrigation interruption switch, 53 ... Section length display, 60 ... Control circuit

Continuation of front page (56) References JP-A 1-236088 (JP, A) JP-A 62-281993 (JP, A) JP-A 4-338485 (JP, A) JP-A 6-296784 (JP) , A) JP 2-40350 (JP, B2) JP 2-25638 (JP, B2) WO 86/2673 (WO, A1) (58) Fields surveyed (Int. Cl. ⁷ , DB name) ) D05B 1/00-83/00

Claims (3)

(57) [Claims] A difference between a first feed amount and a second feed amount different from the first feed amount is determined, and an intermediate portion formed between a sewing section by the first feed amount and a sewing section by the second feed amount. Based on the section length of the sewing section, during this intermediate sewing section, the feed amount is calculated for each unit length, and the pulse motor is driven using the feed amount for each unit length to perform the differential feed of the sewing machine. In the method for controlling the feed amount of the sewing machine, when calculating the feed amount for each unit length, accumulating processing for the remaining pulses of the previous command pulse of the pulse motor,
Determining a sewn dimension of the intermediate sewing section based on the intermediate sewing instruction signal, and setting the cumulatively processed feed amount for each unit length to a pulse motor based on the sewn dimension. Control method. 2. The method according to claim 1, further comprising, when calculating the feed amount for each unit length, accumulating a remaining pulse of a previous command pulse of the pulse motor, and generating a pulse in the calculation process as pulse interval data of the pulse motor. 2. The feed amount control method for a sewing machine according to claim 1, wherein interval data is adopted. 3. A first cloth feeder, a second cloth feeder different from the first cloth feeder, and a feed amount of the first cloth feeder relative to a feed amount of the second cloth feeder. And a pulse motor for increasing or decreasing the shirring amount, in the sewing machine feed amount control device, wherein the first cloth feed means, the first feed amount, the second feed amount different from it A feed length setting means for setting a length of a sewing section by the first feed amount, a length of a sewing section by the second feed amount, and a length of an intermediate sewing section between the two sections. Setting means, using a difference between the first feed amount and the second feed amount,
A feed amount calculating means for calculating a feed amount for each unit length during the intermediate sewing section based on the section length of the intermediate sewing section; and a command has already been issued by the previous calculation even at the time of the calculation processing. If the output of the number of pulses has not been completed, the remaining pulses of the previous command pulse are accumulated during the arithmetic processing for each unit length, and the pulse interval data at the time of the arithmetic processing is adopted as the pulse interval data. Cumulative calculating means, sewing dimension calculating means for calculating the sewn dimensions, intermediate sewing command means for instructing the start of the intermediate sewing section, and after receiving the command of the intermediate sewing command means, during the intermediate sewing section, Based on the sewn dimensions calculated by the sewing size calculating means, the feed amount and the pulse interval data calculated by the accumulating means each time the unit length is sewn are converted to the pulse data. A feed amount control device for a sewing machine, comprising: feed amount control means for instructing a motor as needed.