JPH0426435A - Hole overlock sewing machine - Google Patents

Abstract

PURPOSE:To execute an overlock sewing by a user's desired seam pitch by inputting such data as a user's desired seam pitch with an input means. CONSTITUTION:When a user inputs a desired seam pitch (a), sewing length (b), length (c) of a flow locking bar and the number of stitch (d) to an eyelet part 2a by the operating key 14a of an operating panel 14, by a controller 19, the number of stitch (e) is obtained by dividing the length (c) by the pitch (a), the number of stitch (f) corresponding to one way of a linear hole part 2b is obtained by dividing the length (b) by the pitch (a), and eyelet part sewing data of the eyelet part 2a part corresponding to the number of stitch (d) is read out of a ROM 17. In such a manner, sewing data to the whole eyelet hole 2 is generated. Based thereon, first of all, the flow locking bar part and the right side of the linear hole part 2b are sewn as indicated with an arrow A, next, the eye part 2a is sewn as indicated with an arrow B, and subsequently, the left side of the inner hole part 2b is sewn as indicated with an arrow C, and by such a procedure, overlock sewing 3 is executed automatically to the eyelet hole 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a hole sewing machine such as an eyelet hole sewing machine.

(Prior Art) Conventionally, as shown in FIG. 6, a hole 2 formed in a sewing material 1 consisting of an eyelet portion 2a and a straight hole portion 2b continuous thereto is marked with arrows A, B, and C. As shown, the straight hole part 2b
An eyelet overlock sewing machine is provided which automatically performs a series of overlock stitches 3 on the right side of the eyelet section 2a, the left side of the straight hole section 2b, and the eyelet section 2a.

As shown in FIG. 4, this eyelet sewing machine has an arm part 7 integrally provided with a needle bar 6 having a sewing needle 5 in the upper part of the bed part 4. A looper base 8 having a looper (not shown) and the like is provided opposite the needle bar 6. A feed base 9 is provided on the upper surface of the bed portion 4 and is moved in the X and Y directions by a feed mechanism (not shown) consisting of two pulse motors for the X-axis and Y-axis.

As shown in FIG. 5, the upper surface of this feed table 9 corresponds to a lower knife 10 for forming the eyelet hole 2, which is replaceably provided in the bed portion 4 at the rear side of the looper base 8. An opening 24a is provided, and the sewing item 1 is placed on the left and right sides of the opening 24a, and is pressed and set by a presser foot. After the eyelet hole 2 is formed in the sewing material 1 by the lower knife 10, the feed table 9 moves to the sixth
The starting end 3a of the overlock stitch 3 shown in the figure is fed forward to the position corresponding to the sewing needle 5 (needle hole 8a), and then the needle bar 6 is driven up and down while swinging, and the looper is synchronized with it. While being driven, the feed base 9 is moved by a predetermined feed amount in the order of arrows A-, B-, and C- when the needle bar 6 rises, thereby forming the overlock stitch 3. At this time, when sewing the eyelet portion 2a, the looper base 8 and needle bar 6 are integrally reversed in a counterclockwise direction when viewed from the top by a reversing motor.

The drive mechanism, feed mechanism (pulse motor), and reversing motor are controlled by a control device consisting of a CPU, memory, etc., to control the sewing length input by the user (the length of eyelet hole 2) and the memory (FROM) in advance. The operation is controlled based on the sewing data stored in the sewing machine. Thereby, the number of eaves to be driven by the drive mechanism is determined based on the sewing length. Further, the sewing data is - for each needle (
In this case, the sewing needle 5 moves up and down twice to the left and right, and the number of stitches is counted as the number of stitches minus the number of stitches).
It consists of a set of unit data indicating the rotation angles of the looper base 8 and needle bar 6, and the control device sequentially reads out this sewing data one unit at a time and controls the energization of the feed mechanism (pulse motor) and reversing motor. This is what we do.

Therefore, in this case, when sewing the straight hole portion 2b, Y
While the feed base 9 is moved by a fixed amount for each needle in the axial direction (in the direction of the arrow A' or B''), the needle bar 6 is moved for a predetermined number of stitches.
The vertical movement is performed.

(Problem to be Solved by the Invention) By the way, in the above-mentioned overlock stitch 3, if the stitch pitch a is made small (the stitches are made finer), the eyelet hole 2 portion becomes stronger and the durability is improved, and The appearance will also be improved. On the other hand, if the seam pitch a becomes large (the seams become rough), the durability and appearance will deteriorate, but the sewing work for one eyelet hole 2 will be completed in a short time, thereby improving productivity. For this reason, relatively expensive sewing items such as suits, etc.
In this case, it is desirable to reduce the stitch pitch a, and in the case of relatively inexpensive sewing items 1 such as work clothes, it is desirable to increase the stitch pitch a to shorten the sewing work time.

However, in the above-described conventional sewing machine, the sewing data is fixed, and the stitch pitch a is fixed to a standard constant value. For this reason, as mentioned above, the sewn product 1
It has not been possible to meet the demand for decreasing or increasing the seam pitch a depending on the type of seam.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide an overhole sewing machine that can perform overedge stitching at a stitch pitch desired by the user.

[Structure of the Invention] (Means for Solving the Problems) The hole sewing machine of the present invention causes the needle bar and the looper to be synchronously driven by a drive mechanism, and also moves the feed base on which the sewing product is set when the needle bar is raised. The sewing machine repeatedly moves a fixed feed amount by a feed mechanism to perform overlock stitching in holes formed in the sewing material, and the sewing machine includes an input means for inputting a stitch pitch, and an input means for inputting a stitch pitch. a calculation means for calculating the required number of stitches based on the stitch pitch and the required stitch length; and control of the drive mechanism and the feeding mechanism based on the calculation result of the calculation means and the stitch pitch manually input by the input means. It is characterized by a configuration that includes a control means for controlling.

(Function) According to the above means, the user can input a desired stitch pitch using the input means, and the control means then controls the feeding mechanism based on the stitch pitch input by the input means. Then, overlock stitching with the desired stitch pitch is performed.

In addition, in this case, as the stitch pitch changes, the number of stitches required for overlocking the desired stitch length will differ, but the calculation means calculates the required number of eaves, and based on the calculation result, The drive mechanism drives the needle bar and looper for the required number of stitches.

As a result, the user can perform oversewing at a desired stitch pitch depending on the type of sewing item.

(Example) An example in which the present invention is applied to an eyelet sewing machine will be described below with reference to the drawings.

First, to briefly describe the overall configuration of the eyelet sewing machine based on FIG. 7, and is placed on the sewing machine table 12. As shown in FIG. 2, this sewing machine table 12 includes a needle bar 6 and a looper (
A drive motor 13 serves as a drive source for a drive mechanism that synchronously drives the components (not shown), an operation panel 14 for setting stitch pitch, etc. as will be described later, a foot-operated start/stop switch 15, and the like. , which will also be described later, controls the operation of each mechanism. ROM17. R
A control device 19 consisting of an AM 18 or the like is provided.

A needle bar 6 equipped with a sewing needle 5 is provided at the lower end of the arm section 7, and although not shown in detail, the rotational force of the main shaft rotated by the drive motor 13 is transmitted by a cam mechanism. , it is designed to be driven up and down while swinging left and right. In this case, one rotation of the main shaft causes
The needle bar 6 is designed to move up and down twice to the left and right, and here this is counted as the number of stitches minus the number of stitches. Further, this needle bar 6 is rotated integrally with a looper base 8, which will be described later, by a reversing pulse motor 20 (see FIG. 2) provided in the bed portion 4 and a gear mechanism 21, only a portion of which is shown. It looks like this.

The bed portion 4 is provided with two loopers (not shown) that are opposed to the needle bar 6 and are operated in synchronization with the needle bar 6 to which the rotational force of the main shaft is transmitted by a cam mechanism. A looper base 8 is provided.

Furthermore, a lower knife 10 is fixedly disposed in the bed portion 4 on the back side of the looper base 8.
are provided, and hammers 22 that approach and separate from the lower knife 10 from above are each replaceably provided. The hammer 22 is driven by a hammer drive mechanism 23 (see FIG. 2), which includes an air cylinder provided in the bed portion 4, and cooperates with the lower knife 10 to
As shown in FIG. 6, an eyelet 2 consisting of an eyelet 2a and a linear hole 2b connected thereto is formed in the sewing product 1. In this embodiment, an overlock stitch 3 is performed at the sewing start portion, which is a flow bart stitch.

A feed table 9 on which the sewing product 1 is set is provided on the upper surface of the bed portion 4. The feed table 9 has a thin rectangular box shape as a whole, and a portion of its lower surface corresponding to the looper base 8 and the lower knife 10 is open. Further, on the upper surface of this feed table 9, a metal cross plate 2 having an opening 24a as shown in FIG.
4 are provided. Although not shown in detail, the feed base 9 is moved in the X direction by a feed mechanism 27 (see FIG. 2), which includes an X-axis circumferential Hals motor 25 and a Y-axis circumferential pulse motor 26 provided in the bed portion 4. (left-right direction) and Y direction (front-back direction). Incidentally, on the cross plate 24, there are provided cloth pressers (not shown) located on both left and right sides of the opening 24a to press down the sewing material 1.

Now, as shown in FIG. 3, on the operation panel 14,
Operation keys 14a and a display section 14b are provided for inputting stitch pitch a, stitch length b (length dimension of straight hole portion 2b), flow bar length C, and number of stitches d for eyelet portion 2a. . In this case, the user may, for example, 0.2+n~2
．． A desired stitch pitch a can be selected and input within the range of C1+m. With this,
The operation panel 14 functions as input means according to the present invention.

As shown in FIG. 2, the control device 19 drives the hammer in accordance with a program stored in the ROMI 7 and sewing data to be described later, based on the user's operation of the operation panel 14 and start/stop switch 15. In addition to controlling the mechanism 23, the drive motor 13 and the X-axis circumferential pulse motor 25 . The Y-axis circumferential pulse motor 262 and the reversing pulse motor 20 are controlled to be powered on and off, respectively. Further, the control device 19
As described later, the number of stitches is calculated based on the stitch pitch a, stitch length b, and flow bar length C input from the operation panel 14, and sewing data is created based on these calculation results i. Therefore, this control device]-
9 constitutes the calculation means and control means according to the present invention. The sewing data consists of a set of unit data indicating the amount of feed in the X-axis direction, the amount of feed in the Y-axis direction of the feed base 9 for each needle, the rotation angle of the looper base 8 and the needle bar 6, and this unit The number of data becomes the total number of stitches. Furthermore, the number of stitches d of the eyelet portion 2a (for example, 1 stitch to
A large number of types of eyelet sewing data for the eyelet 28 portion corresponding to 100 stitches are stored.

Note that a needle position detection signal from a needle position detection sensor 32 that detects the rotational position of the main shaft is input to the control device 19, and this signal causes the X-axis peripheral pulse motor 25. f) 889 timing is obtained for the Y-axis circumferential pulse motor 26 and the reversing pulse motor 20.

Next, the operation of the above configuration will be explained.

To start sewing work, the user uses the operation keys 14a of the operation panel 14 to set the desired stitch pitch a,
Input the sewing length, the length C of the flow bar, and the number of stitches d for the eyelet 2a. As a result, the control device 19 creates sewing data as will be described later, and stores it in the RAM 18.

The sewing work is performed as follows. That is, first, the feed table 9
is positioned such that the opening 24a of the cross plate 24 corresponds to the lower knife 10, and the sewing material 1 is placed on this feed base 9.
set on top. Here, when the start/stop switch 15 is turned on, the hammer drive mechanism 23 is driven, and the eyelet hole 2 is formed in the sewing material 1 by the lower knife 10 and the upper knife 22. After this, as shown by the two-dot chain line in FIG. 5, the feed mechanism 27 moves the feed table 9 toward the front until the sewing start position of the sewing product 1 corresponds to the sewing needle 5 (needle hole 8a). be done.

Thereafter, the needle bar 6 is driven up and down while swinging by the drive motor 13, and the looper is driven in synchronization with the needle bar 6, while the feed mechanism 27 moves the feed base 9 according to the sewing data when the needle bar 6 is raised. Overlock stitches 3 are formed by moving in the order of arrows A-, B'' and C by a specified predetermined feed amount.

At this time, when sewing the eyelet part 2a, the looper base 8 and needle bar 6 are moved by the reversing pulse motor 20.
It is designed to be rotated counterclockwise when viewed from the top by a predetermined angle specified by the sewing data. In this case, the sewing needle 5 is attached to the sewing material 1 as shown in FIG.
, N3. It falls in the order of N4゜...
N, which corresponds to the swing width of the sewing needle 5 by one rotation of the main shaft.

Needle drops are made at two locations on N2 (count these as - needles)
, when the needle bar 6 rises until the next needle drop is performed at N, the feed base 9 receives the timing from the needle position detection sensor 32 and moves by the amount specified by one unit of sewing data. What happens is repeated. Therefore, in the straight hole portion 2b, the seam is formed in a so-called sawtooth shape.

Now, the sewing data is created according to the flowchart shown in FIG.

That is, in step S1, the values of the stitch pitch a, the stitch length, the flow bar length C, and the number of stitches d for the eyelet portion 2a manually inputted by the operation panel 14 are read. First, in steps 82 to S4, the number of stitches e in the flow opening portion is calculated. This calculation is obtained by dividing the length C of the flow bar by the stitch pitch a (step S2
), at this time, if there is a remainder (Yes in step S3), it is obtained by adding 1 to the quotient (step S4). In the next steps 85 to S7, the number f of stitches corresponding to one way of the straight hole portion 2b is calculated. This calculation is obtained by dividing the stitch length b by the stitch pitch a (step S5). At this time, if there is a remainder (Yes at step s6), 1 is added to the quotient (step S7). It can be obtained by Then, in step s8, eyelet sewing data for the eyelet 28 portion corresponding to the number of stitches d is read from the ROM 17. With this,
In step S9, the stitch pitch a is determined.

Stitch length, flow bar length C9, number of stitches for the eyelet 2a, d1, number of stitches in the flow bar obtained by the above calculation, e, number of stitches in the line hole part 2b, eyelet eyelet manufacturing data. Then, sewing data for the entire eyelet 2 is created.

Based on the sewing data created in this way, as shown in FIG. Overlock stitch 3 is automatically performed on eyelet hole 2 by sewing the left side of straight hole portion 2b as shown by arrow C. In this case, if the value of the input stitch pitch a is reduced, the stitches become finer and the eyelet hole 2 portion becomes stronger, improving durability and improving the appearance. On the other hand, if the value of the seam pitch a is increased, the seams will become rougher and the durability and appearance will deteriorate, but the sewing work for each eyelet hole 2 can be completed in a shorter time and productivity can be improved. be.

According to this embodiment, unlike the conventional one in which the stitch pitch a is fixed, the user can input the desired stitch pitch a through the operation panel 14, and the control device 19 , create sewing data according to the stitch pitch a and execute overlock stitch 3.

Therefore, for relatively expensive sewn products 1 such as suits, the seam pitch a should be made smaller, and for relatively inexpensive sewn products 1 such as work clothes, the seam pitch a should be increased. The operator can perform the overlock stitch 3 at a desired stitch pitch a depending on the type of the sewing object 1 and the like.

Furthermore, especially in this embodiment, since the number of stitches d of the eyelet 2a of the eyelet hole 2 can be arbitrarily selected, the pattern strength of the seams (sewing with a greater variety can be performed). It is something.

In addition, since the feed base 9 is moved every two needle drops, the sewing data can be cut in half compared to the case where the feed base 9 is moved every one needle drop. It is.

In the above embodiment, the stitch length, the bar length C, and the number of stitches d for the eyelet 2a are also input. However, for example, these values may be fixed and only the desired stitch pitch a may be input. Even if the sewing data is inputted and the sewing data is created from there, the desired purpose can be achieved. Furthermore, in this embodiment, the feed base 9 is moved every two needle drops, but the feed base 9 may be moved every one needle drop.

In addition, the present invention is not limited to the above embodiments, and may be modified as appropriate without departing from the gist, such as being applicable not only to eyelet holes 2 but also to overlocking of so-called sleep holes. It can be implemented by

[Effects of the Invention] As is clear from the above description, the hole stitching of the present invention has an excellent effect of being able to perform overlock stitches at the stitch pitch desired by the user.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a flowchart for creating sewing data, Fig. 2 is a block diagram showing the electrical configuration, Fig. 3 is a plan view of the operation panel, and Fig. 4 is a diagram of the sewing machine. A side view of the whole, Figure 5 is a plan view of the feeding platform, Figure 6
The figure is a plan view of the sewing product. In the drawings, 1 is a sewing product, 2 is an eyelet hole, 4 is a bed part, 5 is a sewing needle, 6 is a needle bar, 7 is an arm part, 9 is a feed base, 13 is a drive motor (drive mechanism), and 14 is an operation A panel (input means), 19 a control device (calculating means, control means), 20 a reversing pulse motor, 25 an X-axis circumferential pulse motor, 26 a Y-axis circumferential pulse motor, and 27 a feeding mechanism.

Claims (1)

[Claims] 1. The needle bar and the looper are synchronously driven by a drive mechanism, and the feed base on which the sewing item is set is moved by a fixed feed amount by the feeding mechanism when the needle bar is raised, which is repeated to form the sewing item. an input means for inputting a stitch pitch; and an arithmetic means for calculating the required number of stitches based on the stitch pitch inputted by the input means and the required stitch length; and a control means for controlling the drive mechanism and the feed mechanism based on the calculation result of the calculation means and the stitch pitch input by the input means.