KR20020079400A - Sewing maching for feeding upwardly and downwardly - Google Patents

Abstract

PURPOSE: To make uniform stitch pitches after sewing-up even when changing a contraction quantity in the middle of sewing. CONSTITUTION: In the upward/downward feeding sewing machine, which is provided with an upward feeding means 24A for feeding upper fabric and a downward feeding means 26A for feeding lower fabric, for making an upward feeding quantity by means of the upward feeding means large than a downward feeding quantity by means of the downward feeding means and performing sewing while forming contraction in upper fabric, this sewing machine is provided with an initial setting means 32 for inputting a target upward feeding quantity, a stitch pitch setting means 34 for setting a target stitch pitch, a downward feeding quantity deciding means 36 for deciding a target downward feeding quantity so that a stitch pitch after sewing can become the target stitch pitch based on the difference between the target upward feeding quantity and the target stitch pitch and a control means 28 for controlling driving of the upward feeding means on the basis of the target upward feeding quantity and controlling driving of the downward feeding means on the basis of the target downward feeding quantity.

Description

Shanghai Songjae Sewing Frame {SEWING MACHING FOR FEEDING UPWARDLY AND DOWNWARDLY}

The present invention relates to a Shanghai Song sewing machine, in particular, an industrial Shanghai Song sewing machine suitable for application when performing condensation sewing by appropriately controlling the conveyance of the upper and lower fabrics.

In general, when stitching the upper fabric and the lower fabric, the upper fabric feed amount (also called the next high feed amount) is made larger than the feed amount per needle (also called the next high feed amount) to sew while forming a so-called "condensation". Condensation sewing is performed.

As a Shanghai Song sewing machine capable of such condensation sewing, what is disclosed by Unexamined-Japanese-Patent No. 6-296788 and 6-296783 is known, for example. When sewing with such a sewing machine conventionally, the condensation amount which is the difference between the high feed rate and the phase feed amount may be changed to T during sewing as shown in FIG. .

However, in the conventional Shanghai Song sewing machine as disclosed in the above publication, even when the amount of condensation is changed during sewing, the seam pitch after sewing completion is unevenly, although the pitch P corresponding to the target feed amount per needle is constant. There was a problem.

The reason for this is different depending on the type and thickness of the fabric, but the greater the amount of condensation, the greater the compression of the upper fabric in one seam, so that the restoring force to return to its original stretched state, such as a leaf spring, is also increased. If the seam pitch before T is equal to P as shown in Fig. 7, the larger the amount of condensation behind T is, the greater the restoring force of the upper fabric, and the lower fabric CL is restored by the elasticity of the original fabric CL. It is thought that the pitch is in the stretching by ΔP.

An object of the present invention is to provide a shanghai-song sewing machine which can make the seam pitch even after sewing completion even when the amount of condensation changes during sewing.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing the main parts of a shanghai sewing machine according to an embodiment of the present invention.

Fig. 2 is a schematic perspective view showing the appearance of the Shanghai Song sewing machine of the present embodiment.

3 is an explanatory diagram showing a relationship between an upper and a high feed roller and an upper and a river provided in a sewing machine main body;

4 is a flow chart showing the operation of the embodiment.

5 is a diagram showing a relationship between a target seam pitch, a target phase feed amount and a target high feed amount;

6 is an explanatory diagram showing a relationship between a stream and a stream after the target condensation sewing.

FIG. 7 is an explanatory diagram corresponding to FIG. 6 showing a conventional problem; FIG.

※ Explanation of symbols about main part of drawing ※

10: sewing machine table 12: sewing machine body

14: operation panel 16: power switch

18: control box 20: first pedal

22: second pedal 24: phase transfer roller

26: high-song roller 28: sewing machine control means

30: seam pitch detection means 32: initial setting means

34: seam pitch setting means 36: high feed rate determination means

38: input precision detection means 40: conversion means

The present invention includes an upper conveying means for sending the upper fabric and a high conveying means for sending the lower fabric, wherein the upper conveying amount is increased by the upper conveying means than the high conveying amount by the high conveying means to sew while forming condensation on the upper fabric. In the Shanghai Song sewing machine, an input means for inputting one of a target phase feed amount, a target condensation amount and a target differential ratio, a pitch setting means for setting a target seam pitch, and an input target phase feed amount, a target condensation amount or a target differential A high feed rate determining means for determining a target high feed rate such that the seam pitch after sewing is a target seam pitch based on the ratio and the target seam pitch, and the phase feed based on the input target feed rate, target shrinkage amount or target differential ratio. The problem is solved by providing a control means for driving control means and for driving control of the high-song means based on the target high-feed amount. It is solved.

That is, in the present invention, the target high feed amount is appropriately controlled in accordance with the increase and decrease of the target condensation amount, so that even when the condensation amount changes in the middle, the condensation sewing can always be performed with a uniform sewing pitch.

EMBODIMENT OF THE INVENTION Embodiment of this invention is described in detail with reference to the following drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows the principal structure of the Shanghai Song sewing machine of one Embodiment which concerns on this invention, and FIG. 2 is a schematic perspective view which shows the external appearance of this Shanghai Song sewing machine.

2, the sewing machine main body 12 having the sewing machine head and the operation panel 14 are installed on the upper side of the sewing machine table 10 as shown in FIG. 16) and the control box 18 is installed, the first pedal 20 and the second pedal 22 is installed below.

In the vicinity of the needle dropping position of the sewing machine main body 12, an image feed roller 24 and a high feed roller 26 are arranged as shown in an enlarged view in FIG. 3, and each of them is provided on an independent pulse motor (not shown). It can be rotated to send the upper CU and the lower CL at different feed rates. Moreover, in the said operation panel 14, setting of the target seam pitch, input of phase feed amount, etc. is possible, and the switch which turns on / off the energization state to the whole sewing machine by the power switch 16 is attained. In addition, the first pedal 20 is arranged for the operation of starting and stopping sewing and changing the sewing speed, and the stepping degree is detected by a potentiometer (not shown), and the signal is transmitted to the control box ( 18).

The second pedal 22 is an operation means used by the operator to change the feeding operation by the image feed roller 24 during sewing, and to arbitrarily increase or decrease the target image feed amount. It is detected by an input accuracy detecting means 38 described later, such as a potentiometer, and the detected value is input to the control box 18 as a phase feed amount.

The shanghai Song sewing machine of this embodiment has a normal control signal from the sewing machine control means 28 as a control means whose main part is constituted by a computer incorporated in the control box 18 with respect to the sewing machine main body 12 as shown in FIG. When control signals of various types described below are input together, and the amount of condensation is changed by sewing the upper and lower streams by varying the image feed amount by the image feed roller 24 and the high feed amount by the high feed roller 26, respectively. Even a seam after sewing is always possible to make a constant pitch.

As shown in FIG. 1, the sewing machine main body 12 has a phase transfer means 24A made of the phase transfer roller 24 and the like which are driven by a pulse motor, and the high feed roller 26 which is similarly rotated and driven by a pulse motor. At the same time, a high pitching means 26A made of the back and the like is provided, and a sewing pitch detecting means 30 for actually measuring the seam pitch of the fabric to be actually sent is provided. The sewing pitch detecting means 30 has a contact roller (not shown) which contacts the cloth CL and rotates according to its feed, and measures the actual feed amount of the cloth from the pulse output of the encoder connected to the roller. The number of needles per needle, ie seam pitch, is measured from the number of needles at the time.

In the present embodiment, the initial setting means 32 for inputting the target phase feed amount before sewing and the input for detecting the stepping degree (input degree) of the second pedal 22 in order to detect that the input target phase feed amount is set by stepping on it are set. The degree detecting means 38 and the seam pitch setting means 34 for setting the target seam pitch are provided. In addition, the input means 31 is constituted by the initial setting means 32 and the input degree detecting means 38, and the initial setting means 32 and the seam pitch setting means 34 are provided on the operation panel 14.

In addition, the sewing machine control means 28 is provided with a high feed rate determining means 36, a storage means 37 and a conversion means 40. A high seam pitch determination means 36 inputs a target seam pitch from the seam pitch setting means 34 and a target phase feed amount to be described later, and appears after sewing as described below based on the difference between the target phase feed amount and the target seam pitch. The target high feed rate is determined to match the actual seam pitch to this target seam pitch. There are two types of target phase feeds: input from the initial setting means 32 through the conversion means 40, and input from the input accuracy detecting means 38.

The storage means 37 is determined by the high feed amount determining means 36 based on the difference between the target phase feed amount input by the initial setting means 32 and the seam pitch input by the seam pitch setting means 34. Remember the target high feed rate.

The conversion means 40 determines the target phase feed amount and the target high feed amount for driving control of the phase feed means 24A and the high feed means 26A based on the initial setting means 32 or the input accuracy detection means 38. Means to convert to That is, the conversion means 40 normally outputs the target phase feed amount set by the initial setting means 32 and the target high feed amount stored in the storage means 37, but automatically detects that the second pedal 22 is stepped on. The mode is switched to stop the output of the target phase feed amount set by the initial setting means 32, and the stepped amount of the second pedal 22, that is, the target phase feed amount detected by the input accuracy detecting means 38 is output. The target high-feed amount is input to the high-feed amount determining means 36, and the target high-feed amount is determined so that the seam pitch after sewing is matched with the target seam pitch based on the difference between the target phase feed amount and the target seam pitch. It is returned to the conversion means 40 again. The converting means 40 stops outputting the target high feed rate stored in the storage means 37, and outputs the target high feed rate newly determined based on the target phase feed amount from the input accuracy detecting means 38.

Here, the method for calculating (determining) the target high feed rate performed by the high feed amount determining means 36 will be described.

P sets the seam length (target seam pitch) per needle set by the operator, and the target phase feed rate per needle at an arbitrary number of needles (n) from the start of the seam set by the operator. When the target high feed rate per needle is Ln, the ratio between the amount of elongation per needle (P-Ln) and the difference amount (Un-P) suitable for the target amount of tightening is constant.

(P-Ln) / (Un-P) = a... (One)

(Where a is an integer determined by the type or thickness of the cloth)

Is established. And if you solve this expression for Ln,

Ln =-(Un-P) a + P... (2)

Becomes According to this equation (2), the operator sets the target seam pitch P and the target feed amount U for an arbitrary number of needle positions so that the target high feed amount L can be determined according to these values.

In this embodiment, when the seam pitch after sewing is actually measured by the seam pitch detection means 30, the measured seam pitch is input to the high feed rate determining means 36, and a deviation occurs between the target seam pitch. If there is, the high feed amount capable of eliminating the deviation is calculated, and the feedback control for correcting the target high feed amount following the high feed means 26A set at that time is performed.

The method of correcting the high feed rate in this case will be described next. If the measured seam pitch is M, the ratio of the number of needles (n) to the target high feed rate Ln is constant.

M / Ln = constant… (3)

Becomes Then, considering that the measured value M becomes the target value P for the needle number n + 1 by correction (correction), the relationship with the new target feed amount Ln + 1 is expressed by the following equation.

M / Ln = P / Ln + 1... (4)

Becomes Solve this (4) for Ln + 1

Ln + 1 = (P / M) Ln... (5)

Becomes This can be corrected to the target seam pitch P with the actual seam pitch set.

Next, the operation of the present embodiment will be described with reference to the flowchart shown in FIG. 4.

First, the power switch 16 is turned on to energize the sewing machine (step 1), and then the target phase feed amount and seam are set using the phase feed amount input means 32 on the operation panel 14 for initial setting. The pitch is entered (step 2). The input target phase feed amount and the target seam pitch input in this way are input to the high feed rate determining means 36 formed of an arithmetic circuit formed inside the control box 18, and the high feed amount is determined by equation (2). The determined value is stored in the storage means 37 (step 3).

Fig. 5 shows the target seam pitch (solid line) initially set in this way, the target phase feed amount per needle (depicted by broken lines in the figure), which changes according to the number of needles on the horizontal axis, and the target bottom per needle calculated from both of them. An example of the feed amount (high-song pitch shown by the dashed-dotted line in the figure) is shown graphically.

In this figure, the 0-a section is the normal sewing which is the same pitch for both the high feed and high feed, so the high feed pitch is the same as the set target seam pitch. Section a-b is a condensed stitch section in which the phase feed pitch increases with respect to the target seam pitch. In this section, the high-song pitch decreases from the target seam pitch as the upper-feed pitch increases. In b-c, the difference between the target seam pitch and the upper feed pitch is constant, so the difference between the target seam pitch and the high-song pitch is also constant. In each sewing section after c, the target high feed amount is determined according to the same principle.

After the initial setting is completed as described above, the operator sets the sewing material on the sewing machine (step 4), and the sewing machine start signal is input to the control box 18 by stepping on the first pedal 20 (step 5). The sewing machine starts and sewing starts (step 6).

In this way, the sewing machine is started and the seam pitch after sewing is automatically controlled even though the amount of condensation changes in the middle by automatically controlling the phase transfer means 24A and the high-feed means 26A to be the target values shown in FIG. It is possible to form a uniform seam such as the target seam pitch set at the initial stage.

Moreover, in this embodiment, it is also possible to input a target phase feed amount manually by an operator. That is, after the sewing machine is started, the operator steps on the second pedal 22 (step 7), and the conversion means 40 converts it to the manual input mode, and the input accuracy detecting means (potentiometer) 38 This stepping degree is detected and it is input into the said control box 18 as a target phase feed amount, and a target phase feed amount increases and decreases according to an input (stepping degree), and a condensation amount can be increased or decreased. In this way, when the second pedal 22 is stepped on in step 7, and the target phase feed amount (input) is changed, the high feed rate determining means 36 executes the calculation according to the equation (2) again using the new target value. The target high feed rate is determined (step 8). Then, the feed amount by the high feed means 26A is changed so that the new target high feed amount determined during sewing (step 9).

When there is no input change by the second pedal 22, the seam pitch of the sewing is detected by the seam pitch detection means 30 (step 10), and the target seam pitch to be set and the detected actual sewing pitch are detected. It is determined whether there is a difference (step 11), and when there is a difference between them, the target value at which the pitch difference becomes substantially zero by the expression (5) in the high feed rate determining means 36 inside the control box 18 is determined. The feed amount is determined (step 12). During sewing, the high feed amount is changed to this target position, and the process returns to the step 20 above. Then, when the step of the first pedal 20 is stopped and the input of the sewing machine start signal to the control box 18 is stopped, the sewing machine stops and sewing is finished (steps 14 and 15).

According to the present embodiment described above, it is possible to determine the appropriate target high feed amount based on the target phase feed amount and the seam pitch and to sew while controlling the high feed amount, so that the seam after the end of sewing is uniform even though the amount of condensation changes. I can form it with one pitch.

As mentioned above, although this invention was demonstrated concretely, this invention is not limited to what was shown in the said embodiment, A various change is possible in the range which does not deviate from the summary.

For example, the specific structure of the Shanghai Song sewing machine of this invention is not limited to what was shown in the said embodiment. The operation means is not limited to the second pedal 22 but may be manually operated such as a slide bar.

The shanghai conveying means is not limited to the shank conveying rollers 24 and 26, but may be conveyed by a conveying tooth.

The high feed rate determining means may determine the target high feed rate from the table stored in advance, although the target high feed rate is determined by the calculation according to the above formula (2).

The value input from the initial setting means or the input accuracy detecting means is not limited to the target phase transfer amount, but may be a target condensation amount or a target differential ratio.

If you enter a target condensation amount,

Target condensation = target phase feed (Un)-target seam pitch (P). (6) relationship holds. And if we solve this equation (6) for the target phase feed (Un),

Target feed rate (Un) = target condensation amount + target seam pitch (P). (7). By substituting this formula (7) into the above formula (2), the target high-feed amount can be determined.

In addition, when the target differential ratio is input, the target differential ratio is

Target Differential Ratio = Target Phase Feed (Un) / Target Seam Pitch (P). (8)

The relationship is established. And if we solve this expression (8) for the target phase feed (Un),

Target feed rate (Un) = target differential ratio * target seam pitch (P). (9)

Becomes The target high-feed amount can be determined by substituting this formula (9) into the formula (2).

The operation of the input accuracy detecting means is not limited to the function of the converting means, but a dedicated converting switch may be arranged so that the converting means is operated by the operation of the switch.

The determination of the target high feed rate is not limited to that performed before sewing based on the setting of the initial setting means, and may be determined immediately during sewing. However, if the configuration is not determined immediately during sewing, no processing is required during sewing, so that a device having a slow processing speed can be used, thereby reducing the cost.

As described above, according to the present invention, even when the amount of condensation changes during sewing, the seam pitch after sewing completion can be made uniform.

Claims (6)

Shanghai Song sewing machine which has the upper conveying means for sending the upper fabric and the high conveying means for sending the cloth, and sewing while forming condensation on the upper fabric by making the upper conveying amount by the upper conveying means higher than the high conveying amount by the high conveying means To Input means for inputting any one of a target phase feed amount, a target condensation amount, and a target differential ratio; Pitch setting means for setting a target seam pitch, A high feed rate determining means for determining a target high feed rate such that the seam pitch after sewing is the target seam pitch based on the input target feed rate, target condensation amount, or target differential ratio and target seam pitch; And control means for driving control of the phase transfer means based on the input target phase transfer amount, target condensation amount, or target differential ratio, and drive control of the high transfer means based on the target high transfer amount. Shanghai Song sewing machine. The method of claim 1, The input means is an operation means operated by an operator during sewing, and the high feed amount determining means determines the target high feed amount during sewing based on a target phase feed amount input as an operation amount of the operation means. . The method of claim 2, The input means includes an initial setting means for initial setting by inputting a target phase feed amount, a target condensation amount or a target differential ratio before sewing in addition to the operation means, And a converting means for converting a target high feed amount determined based on an input from said initial setting means and a target high feed amount determined based on an input from said operating means. The method of claim 3, wherein During sewing of sewing by using the target high feed rate determined on the basis of the input from the initial setting means, when the operating means is operated, the converting means is converted into a target high feed amount determined based on the input from the operating means. Shanghai Song sewing machine. The method of claim 1, And said target phase feed amount is input by either said input means as one of a target condensation amount and a target differential ratio, and converted into this target phase feed amount. The method of claim 1, Seam pitch detection means for detecting the seam pitch during sewing, And when the deviation occurs between the detected seam pitch and the target seam pitch, the high-feed rate determining means determines and corrects a new target high-feed amount to eliminate the deviation.