JPH0744984B2 - Feed control device for long sewn items on sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is mainly applied to hem lace rubber such as chute and girdle, and natural rubber such as pan taste packing and tights.
It is applied when sewing tape-like materials such as the buttocks of training pants, shoulder tapes for sweatshirts, and other types of lace rubber attachments along fabrics. The present invention relates to a long sewn product feed control device in a sewing machine having a function of sewing a long sewn product (hereinafter referred to as a tape or the like) along a cloth.

[Prior Art] As a tape feeding control device of this type, as disclosed in, for example, JP-A-58-175586,
Those configured to control the feeding speed of the tape or the like in synchronization with the feeding speed of the cloth, for example, as disclosed in JP-A-62-213793, regardless of the feeding speed of the cloth, A value related to the elongation rate of the tape, etc. is set as the control target value, the actual tension of the tape, etc. is detected, converted to the same physical quantity, and then the tension of the tape, etc. is variably controlled so that both values are equal. The one configured to do is known.

[Problems to be Solved by the Invention] Among the above-mentioned prior arts, the former one that controls the feeding speed of a tape or the like does not induce stretching or slack in the tape or the like, and is a cloth for sewing the tape or the like. The feeding speed of the tape and the feeding speed of the tape, etc. must be exactly the same, and if there is a slight error in both speeds, the errors will accumulate when sewing long tapes, etc. There is a drawback in that the product is finished and particularly the appearance is deteriorated by being sewn in a loose state.

Further, the latter type which directly controls the elongation rate of the tape or the like is suitable for sewing such as putting a gear tooth in a desired section of the cloth, but in order to control the elongation rate of the tape or the like, the tape is used. It is necessary to variably control the tension of the tape or the like by detecting the tension of the tape or the like and comparing the detected value with the set value. Therefore, the tape or the like is always loaded, and the feed amount of the tape or the like changes depending on the feeding speed of the cloth, that is, the sewing speed, and as a result, the finish of the product, especially the appearance is poor. There is a drawback that.

The present invention has been made in view of the above circumstances, and it is possible to reliably deliver a tape or the like having a required length with respect to the transfer length of a fabric in an unloaded state, and the number of needles and the length of the tape or the like are Regardless of how they are set to each other, regardless of the feed speed of the fabric and the material such as tape, a tape feed control device for sewing machines that can always sew products with good finished dimensional accuracy and good looks The purpose is to provide.

[Means for Solving the Problems]

In order to achieve the above object, a tape feeding control device in a sewing machine according to the present invention includes a cloth feeding mechanism for transferring cloth to a sewing portion, a cloth pressing mechanism provided with a long sewn material supply guide, and the guide. After that, a long sewn product, an auxiliary feed mechanism for sending the sewn portion to the sewing portion, a motor for driving the auxiliary feed mechanism, a hand movement number setting means for setting the number of hand movements, and a long sewn product corresponding to the set number of hand movements. Of a long sewn product for setting the length of the long sewn product, and the long sewn product feed amount for each stitch is calculated based on the number of stitches and the length of the long sewn product set by these setting devices. A feed amount calculation means and a motor drive means for outputting a required operation amount corresponding to the calculated feed amount to the motor are provided, and the calculation means is based on the set number of stitches and the length of the long sewn product. Means for calculating the feed amount for each stitch Dividing the set pointer movement speed in the remainder value generated by its calculated is made of a means to allocate almost uniformly the quotient to hand movement number.

Further, a stepping motor is used as a feeding motor for the tape or the like, and is calculated by the calculating means from the number of pulses generated for each stitch by the pulse generating means for generating a plurality of pulses for each stitch in cooperation with the sewing machine main body. The stepping motor may be operated by one step for each pulse obtained by dividing the number of operation steps corresponding to the fed amount.

[Operation] According to the present invention, the number of hand movements is set and input in the number of hand movements setting means in accordance with the length of the cloth, and the length of the tape or the like is set in the length setting means in correspondence with the number of hand movements. By inputting, the feed amount of the tape or the like for each stitch is calculated.
Here, if there is a surplus value in the calculated feed amount, the set number of hand movements is divided by the surplus value, and the quotient is almost evenly allocated to the number of hand movements. The required movement amount corresponding to the feed amount of the tape or the like calculated in this way is output to the motor, and the motor is driven by the above-mentioned required movement amount, so that the cloth is transferred with the tape or the like being unloaded. It will be sent to the sewing section over a required length corresponding to the length.

Further, when a stepping motor is used as a tape feeding motor, it corresponds to the feeding amount of the tape or the like calculated from the number of pulses generated per stitch by the pulse generating means linked to the sewing machine main body. By operating the stepping motor by one step for each pulse obtained by dividing the number of operation steps, the number of step operations of the stepping motor is changed in synchronization with the speed change of the sewing machine main body so that a tape without step out It can be sent out.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of the entire tape feeding device. In FIG. 1, 1 is a tape such as rubber or spin tape for sewing to a cloth, and 2 is a fixed tape guide rod for guiding the transfer of the tape 1. A stepping motor 3 for feeding the tape has a main driving roller 5 fixed to its rotary shaft, and a driven roller 6 having a diameter slightly smaller than the main driving roller 5 is arranged in the vicinity of the main driving roller 5 and both rollers are provided. A tape auxiliary feeding mechanism is constituted by 5 and 6.

Reference numeral 7 is a tape supply guide, and the tape 1 is attached to both rollers 5,
It leads to six. Reference numeral 4 is a motor cover, 8 is a coupling cover, 9 is a roller mount for rotatably supporting the rollers 5 and 6, and the roller mount 9 is provided with a bracket 11 for mounting on the sewing machine main body. . Reference numeral 14 is a tape holding pressure adjuster, which moves the driven roller 6 into and out of the driving roller 5 to move the rollers 5 and 6 together.
The clamping pressure of the tape 1 due to is adjustable.

13 is a tape guide bar that can swing around the support shaft 13a,
A pair of tape guides 10, 15 in the width direction of the tape are attached to one end side thereof so as to guide the tape 1 delivered by the rollers 5, 6 to a sewing portion described later. In addition, on the other end side, an arrow a is formed on the roller mount 9 through a long hole 12a and a bolt 12b.
The end of the tape guide stopper 12 is attached so that it can be adjusted in and out in the -b direction, and the tape guide stopper 12 is supported by adjusting the tape guide stopper 12 in and out in the direction of arrow a-b. It is configured to swing in the cd direction around the shaft 13a to adjust the positions of the tape guides 10 and 15.

A cloth presser 17 is attached to the lower end of a presser bar 18 that moves up and down via an actuator (not shown) to form a cloth presser mechanism. The cloth presser 17 is connected to a tape supply guide 16. A feed dog (not shown) is provided below the presser foot 17
Are provided, and the feed dog and the presser foot 17 constitute a cloth feed mechanism for transferring the cloth to the sewing portion. These cloth pressing mechanism and cloth feeding mechanism are provided on the sewing machine main body side.

FIG. 2 shows the tape feeder 22 and the sewing machine main body having the above-mentioned configuration.
25 is a perspective view of a main part showing a configuration related to 25, in which FIG.
Reference numeral 19 is a pulse encoder that serves as a pulse generating means. The pulse encoder 19 is connected to an end portion of the sewing machine shaft 26 protruding from the sewing machine arm 23 on the sewing machine main body 25 side. A plurality of pulses are generated for each.

20 is a control box forming the main part of the feed control device, 21
Is a knee switch serving as an input means for setting the number of stitches and the length of the tape, which is arranged below the sewing machine main body 25. 27, 28 and 29 are the pulse encoder 19 and the control box 20, the tape feeding device 22 and the control box 20, the knee switch.
It is a signal cable that connects the control box 21 and the control box 20, respectively.

FIG. 3 is a block diagram showing the configuration of the control system in the tape feeding device 22. In the figure, reference numeral 30 is a hand movement number setting means, for example, the first to third hand movement numbers are selectively set according to the operation amount of the knee switch 21, which is set in the control device 31 in the control box 20. input. Reference numeral 32 denotes a tape length setting means, which selectively sets, for example, first to third tape lengths corresponding to the first to third hand movement numbers according to an operation amount of the knee switch 21, and controls the above. Input to the device 31.

The control device 31 is composed of a computer system, and includes a central processing unit (CPU) 33, a ROM 34 storing a control program, and a tape feeding stepping motor 3.
RAM 35 for storing step number data for each needle, input / output port (I / O port) 36, motor drive circuit 37
And a waveform shaping circuit 38 that shapes the pulse waveform by the pulse encoder 19.

Next, among the operations of the above-described configuration, the processing procedure by the control device 31 will be described with respect to the operation relating to the calculation of the tape feed amount for each stitch and the calculation of the number of operation steps of the stepping motor 3 corresponding to the tape feed amount. Description will be made based on the flow chart of FIG.

By operating the knee switch 21, the desired number N of movements of the needle by the number of movements setting means 30 and the tape length L to be sent out by the tape length setting means 32 are respectively passed through the I / O port 36 to C.
Input to PU33. At this time, 1 of the stepping motor 3
The tape sending length P per step is read from the RAM 35 and transferred to the CPU 33.

In this way, the CPU 33 to which the number N of hand movements, the tape length L, and the tape delivery length P are input is L / P / N = a ... b (remainder) based on the control program stored in the ROM 34. Is calculated and the number of operation steps a (integer) of the stepping motor 3 and the remainder b (integer) corresponding to the tape feed amount for each stitch are calculated (step 100).

For example, P = 0.2 mm
Using stepping motor 3 of, the number N of movements is N = 100
In the case of the first example in which the tape length L is set to L = 250 mm, the operating step number a for each stitch of the stepping motor 3
Is a = (250 / 0.2) ÷ 100 = 12.5, and the number of steps (integer) for each stitch is a = 12, and the remainder b is b = 50.

Further, in the case of the second example in which the tape length L is set to L = 255 mm while P = 0.2 mm, the number N of stitches moved is N = 100, a = (255 / 0.2) ÷ 100 = 12.75 = 12 and b = 75. Where the remainder b
Is the number of DATA for which a + 1 needs to be stored out of 100 data addresses (DATA).

Next, the number of operation steps a (= 1
2) is stored in 100 pieces of DATA (step 101).

Then, as a result of the calculation in the above step 100, it is judged whether or not there is a remainder b (integer) (step 102), and in the judgment result, when b = 0, the number of the N (= 100) number of hand movements. The number of operation steps a (= 12) for each operation is stored in N (= 100) DATA addresses on the RAM 35, and the predetermined operation is completed.

On the other hand, if the result of the determination at step 102 is that b is 0, the remainder value b is divided by the number N of hand movements in order to evenly allocate the remainder value b, and the quotient thereof, that is, the operation step number a. Then, the space c between the DATA addresses that needs to be incremented by 1 is calculated (step 103).

For example, in the case of the above-mentioned first example, c = 100/50 = 2, and in the case of the second example, c = 100/75 = 1.3.

Therefore, in the case of the first example, the DATA addresses for storing the number of steps a + 1 are 50 addresses 0, 2, 4, 6 ... 96, 98,
In addition, the number of steps a + 1 in the case of the second example is stored.
DATA addresses are 1.3, 2.6, 3.9, 5.2, ………, 97.3, 98.6
However, in the case of this second example, the DATA address for storing the number of steps a + 1 by rounding down the decimal point is 0,
1, 2, 3, 5, ... 97, 98 total 75 addresses.

Then, the data d obtained as described above is set in 100 first DATA addresses on the RAM 35 (step 104),
Next, the integer part of the data d is converted into the above 50 or 75 DAs.
After the TA address e is set (step 105), the content of the address indicated by this e is incremented by 1 (step 106).

Then, the data d is set c times (step 107).

By repeating the above operation, in step 108, d
It is judged whether or not> 99, and when d> 99, the predetermined operation is ended.

By the above operation flow, the DATA address on RAM35
As shown in FIG. 5, the stepping motor 3 for each stitch from the first stitch of the sewing machine to the final stitch of the set number of stitches
The operation step number "a" or "a + 1" is stored in the DATA address on the RAM 35 as a table.

Next, in order to perform the step operation in synchronization with the pulse generated by the pulse encoder 19 linked to the sewing machine main body 25, the CPU 33 executes the following arithmetic processing.

Basically, if the number of pulses generated by the pulse encoder 19 for each rotation of the sewing machine, that is, one stitch, is P, and the number of operation steps per stitch of the stepping motor 3 is M, P /
The stepping motor 3 may be rotated one step every M pulses.

A specific operation therefor will be described based on the flow chart in FIG.

FIG. 6 is a flow chart showing the processing procedure during sewing. First, the operation step number a or a + 1 for each stitch of the stepping motor 3 is RA by the flow chart of FIG.
Remembered on the M35. The number of operation steps a or a + 1 for each stitch determines which number of pulses generated by the pulse encoder 19 causes the stepping motor to perform one step operation.

In FIG. 6, A indicates the address on the RAM 35 in which the number of operation steps for each stitch of the stepping motor 3 is stored, and B indicates the contents of the RAM at the address indicated by A.
That is, it indicates a or a + 1, C indicates P / B, D indicates the integrated count value of the pulses generated by the pulse encoder 19, and E indicates the processing within the rotation of the sewing machine 1.

First, the first DATA address where data is stored is set in A (step 210).

In the case of FIG. 5, A = 1.

Next, the contents of the RAM at address A are set in B (step 211). In the case of FIG. 5, B = a or a + 1.

Based on the set in step 211, pulse encoder 1
At the 1st pulse of 9, the stepping motor 3 is rotated by 1 step (step 212).

Next, C = P / B, that is, the stepping motor 3 is rotated by one step each time C pulses are input from the pulse encoder 19, so that one rotation of the pulse encoder 19 causes the stepping motor 3 to rotate a or a + 1 step. Yes (step 213). At this time, D = 0.

Next, it is determined whether or not there is one pulse input from the pulse encoder 19 (step 214).

When one pulse is input from the pulse encoder 19 in this step 214, the operation is performed so that D ← D + 1 (step 215).

Next, a comparison is made as to whether or not the integer part of C and the pulse counter value of D are equal (step 216). If C = D, the stepping motor 3 rotates one step (step 217).

Next, the number of pulses of one step of the next stepping motor 3, C ← C + (P / B), is calculated (step 218).

Subsequently, it is determined whether or not the pulse encoder 19 has made one rotation, that is, whether D = P (step 219). If D ≠ P, the operation returns to step 214 and the operations of steps 214 to 219 are repeated. If D = P, the next one-rotation operation, that is, A ← A + 1 is performed based on the next data (step 220).

By the above steps, the processing E within one revolution of the sewing machine is completed, and it is judged whether or not it is necessary to shift to the next process (step 221). When it is necessary to shift, the predetermined operation is terminated.

It should be noted that the set number of the number of hand movements and the set value of the corresponding tape length are made into a table in advance and stored in the RAM 35 of the control device 31, and the input numerical value by one numerical value input means such as a ten-keyboard is set to, for example, 0. In the case of, the number N of hands moved and the length L of the tape are 300 mm, so that the number N of hands moved and the length L of the tape are read out from the RAM 35 and a predetermined calculation is carried out. It has the same effect as the example.

Further, in the above-mentioned embodiment, since the width is relatively narrow, the length is long, and the material is liable to be stretched, it is difficult to control the feeding of the cloth and the posture of the cloth on the cloth. Although the case of sewing along is described, the present invention is not limited to the tape, and even if it is applied to the sewing of any long sewn product, the same effect as the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the present invention, the tape feed amount for each stitch is calculated by simply setting and inputting the number of stitches and the corresponding length of the tape or the like. It is possible to automatically and surely operate the feeding motors such as the above in accordance with the transfer length of the cloth. In addition, when there is a surplus value in the calculated feed amount of the tape or the like, the set number of hand movements can be divided by the surplus value and the quotient can be evenly allocated to the number of hand movements. Therefore, it is possible to reliably send a tape or the like having a required length to the transfer length of the cloth in an unloaded state, and it is possible to set the number of stitches and the length of the tape or the like to each other. , Regardless of the feeding speed of the fabric and the material of the tape, etc., without causing unnecessary stretching or loosening of the tape, etc., and further generation of local wrinkles,
It is possible to always sew a product having a finished dimensional accuracy and a good-looking appearance.

In particular, a stepping motor is used to feed tape,
By configuring the stepping motor to perform the step operation based on the number of pulses for each stitch by the pulse generating means linked to the sewing machine main body, there is no step-out in the feeding of the tape or the like, and the step is more uniform and good. The product can be sewn on.

[Brief description of drawings]

FIG. 1 is a perspective view of an entire tape feeding device according to an embodiment of the present invention, FIG. 2 is a perspective view of a main portion showing a related configuration of the tape feeding device and a sewing machine main body, and FIG. 3 is control of the tape feeding device. A block diagram showing the configuration of the system, FIG. 4 is a flow chart showing the operation for calculating the tape feed amount and the number of operation steps of the stepping motor, and FIG. 5 is RA.
FIG. 6 is a flow chart showing the operation of the stepping motor at the time of actual sewing. 1 ... tape, 3 ... tape feed stepping motor, 5,6 ... roller, 16 ... tape supply guide, 17 ...
… Fabric foot, 19 …… Pulse encoder, 22 …… Tape feeder, 25 …… Sewing machine body, 30 …… Hand movement number setting means, 31…
… Control device, 32 …… Tape length setting means, 33 …… CPU, 3
4 …… ROM, 35 …… RAM, 36 …… I / O port, 37 …… Motor drive circuit.

Claims (2)

[Claims] 1. A cloth feed mechanism for transferring cloth to a sewn portion, a cloth pressing mechanism provided with a long sewn product supply guide, an auxiliary feed mechanism for sending a long sewn product to the sewn portion via the guide, A motor for driving the auxiliary feed mechanism, a number of stitches setting means for setting the number of stitches, and a long sewn product length setting means for setting the length of the long sewn product corresponding to the set number of stitches. A feed amount calculating means for calculating a long sewn product feed amount for each stitch based on the number of stitches and the length of the long sewn product set by both of these setting means, and it is necessary to correspond to the calculated feed amount. A motor driving means for outputting an operation amount to the motor, and the computing means calculates the feed amount for each stitch based on the set number of stitches and the length of the long sewn product, and a remainder generated by the calculation. Divide the set number of hands by the value and use that quotient as the number of hands URN feed control apparatus for a long workpiece in a sewing machine, characterized in that it consists of a means of allocation equally. 2. The motor is a stepping motor,
For each pulse obtained by dividing the number of operation steps corresponding to the feed amount calculated by the calculating means from the number of pulses generated by each needle by the pulse generating means that generates a plurality of pulses for each needle in cooperation with the sewing machine main body. 1 stepping motor above
The feed control device for a long sewn product in a sewing machine according to claim 1, wherein the feed control device is configured to perform a step operation.