TW593825B - Sewing machine - Google Patents

Abstract

To provide a sewing machine capable of automatically carrying out an inspection whether sewing has been sewn in a prescribed length. A tape feeder has a pair of rollers and pinching a tape and the tape is delivered by rotationally driving the roller by a step motor. Pulse signals to the step motor are given from a control section. The control section has a tape feed pulse counter to count the number of pulses to the stepping motor and detects the length of the tape delivered by the counter. The control section has recorded a prescribed length of the tape to be sewn, and after sewing work ends, computes a difference between the prescribed length and the length of the tape actually delivered and issues a warning if the difference exceeds a permissible error margin.

Description

593825 V. Description of invention d) Technical field 杳. The present invention relates to a sewing machine, especially after sewing.-BACKGROUND ART 2 Hem lace elastic bands for pants, women's tights, etc .; Pantyhose: elastic bands for the upper part of pants; swimwear and sports "two tight fit ^ will These ribbons (hereinafter referred to as strips) are sewn to the cloth ^ ▼ The stitches are sent out from the belt conveying device of the 1-stitch sewing machine and will take you to the fabric. The accuracy of the strips is good ::鏠 ^ ^ .1 ^ ^ # .V ^ 7_44984 ^ Γ Transportation control device. " A long size sewing :::: Strip stitching is explained in more detail = 合. Sew the strip to the end of the fabric :::. : Cutting cloth 2, elastic bands such as elastic bands, so that the stitched fabric can be shrunk to obtain the addition: ： 仃 ’仃 可 可 外 通过 通过 通过 不 不 不 不 不 不 不 不 不 张力 不 张力 张力 张力 张力 张力 张力 张力 张力 张力 张力 张力 张力 张力 张力 张力 张力 张力 张力 张力 张力Another fit. At this time, the strips sewn to the cloth are measured: from :: size to be sewn. Wrinkled stitches are added. When the wrinkles do not stretch, advance = length. That is to say, for example, a flat ruler is placed on a strip, and operation c is performed. Specifically, at the place of the cloth after stitching 2174-4452-PF; ahddub.ptd page 4 593825 1. Description of the invention (3) consists of: the above-mentioned sewing material feeding device; The ribbon is sewn on the length of the hairband according to the hair and whether the credit is applied according to the regulations. The patent lies in that the length of the hairband can be determined according to the hair. The application for a patent consists in having a length and an allowable amount of the above-mentioned amount to set the accuracy of sending a long product measured according to the predetermined delivery of this publication. The patented product is a ribbon and has a ribbon shape to send the above-mentioned ribbon. The sending-out length detecting device detects the length of the loaded article from the ribbon; the sewing machine body performs the sewing operation of the ribbon; and the predetermined sending-out length is the length of the material to be stitched. Even if the sewing material is a belt such as an elastic band, even when the fabric is being sewn, by comparing the predetermined length recorded by the recording device at the end of sewing, the sewing can be automatically checked. The sewing machine according to the present invention in the range f3 is characterized by arbitrarily setting a predetermined feed length setting device recorded by the recording device. Because the above-mentioned specific feed length corresponding to the specified sewing length can be arbitrarily set, the sewing machine according to the present invention according to the fourth item of the set range arbitrarily set is characterized by: = Ϊ Ϊ detected by the feed length detection device The allowance of the difference in the predetermined delivery length recorded by the delivery device is' can be set arbitrarily by the above recording device.

Git length detection is measured at the end of sewing, and it can correspond to the required cutting range of item 5 of the present invention.

& Description of the invention (4) is that the conveying device according to the result of the present invention has a conveying device having a predetermined length exceeding the allowable operator after the conveying length of the sewing product having been fed out. The patent application set is characterized in that the tape-like tape stitched to the cloth is sent out with a preset tape shape in the recording device device, and compared with the above-mentioned recording length setting device by the above-mentioned sending length detection allowance setting device; and the transmission When the length calculated by the installation device is transmitted, and the result is the length of the ribbon sent according to the present invention, this is compared with the automatic inspection device. The length detection is performed by the delivery length detection: the result of the transfer of the self-recorded sewing products: : I have? When the quantity obtained by the comparison device is sent, the length of the seam 1 of & heat and s is equal to the length, which is enough to send a warning through sound or light, etc. = 6 · Item: Λ The ribbon described in the invention is sent out Load the object; send out 2 set the cutting machine and set the Zt Λ degree detection device to detect the length from the top 2; record device to record the object to send out the sore. G ^ $ 定 此 此 'out length, the set The length setting device, the above-mentioned predetermined sending length of the :: object; comparing the predetermined sending length recorded by the two devices with the above

The length of the feed I + E detected by the wave set and the difference in length are different; allow: The allowable setting of the difference of the preset feed length recorded by the feed length detection device detected by the feed length detection device is compared by the above at the end of the sewing operation. The difference between the difference and the allowable 0 set in the allowable amount setting device is compared at the end of sewing, and the length of the belt sending device and the predetermined sending length are compared, and the difference between the lengths exceeds the allowance and is transmitted to the operator through the transmission device. So can

593825--V. Description of the invention (5) The M method of the present invention in item 7 of Shen Qing's patent scope, the pottery η force association-Γ. The control of the escaped sewing machine to measure the delivery of the sewing product J Two first: ::: 1 send out length; check and compare the above-mentioned recorded sewing items: determine whether the difference between the sent out length of the two items is set in advance = and = the stitched out length and the preset sent out length = ^, compare Send out the sewing product at the end of sewing = saving, and enter: automatic check. By size inspection, work efficiency is improved. Embodiment of the invention for measuring the finished product by manual operation Fig. 1 is a perspective view of a belt according to an embodiment of the present invention. The strip conveying device L is installed in the state of sewing.) It is used when lace the elastic band and the loose body (not shown in the figure, the cloth (not shown in the figure). ). Device body 2 and control box 3 Conveying device body 2 has 7 stepping motors that hold the belt and drive the big roller 5 ^ Parent-child 5, small roller 6 is supported by 10, rollers are installed η rollers 5, 6 are rollers Install Α to get the rollers 5 and 6 configuration; 2 ° = = 8 The factory is fixed to the sewing machine body, and the outer peripheral surface of V 6 passes through the "seam / machine body's top 4". The roller f A rough surface is formed, and the soil roller is 5, while ㈣. In addition, 'strips, clamping force can pass == force large = 5 $ 8 pages 2174-4452-PF; ahddub.ptd 593825

The setting device 13 can be adjusted in accordance with the thickness of the strip T and the like, and thereby the optimum clamping force can be obtained. Pressing per: 7 punches (picture: not shown) connected to the big parent-child 5 'This may be only two V. Set a slight angle. The strip guide 4 is provided with a guide 16 for feeding strips. In addition, the bottom ▼ strip guide bar 15 of the cloth. A section 19 is provided between the "belt" and the cloth grinder 4, and will guide the sheet strip T through its front end by the ft hand ^ / R, ..., =: The strip guide rod 15 may be supported by the support shaft 17: The position of the belt guide stopper 18 is changed by the belt guide stopper 18. The position of the belt guide stopper 18 can be adjusted: J guide = two positions can be adjusted. With this configuration, the tape can be guided to the position of the tape supply guide 16 = the guide bar 15 疋 to the position where the two rods can be smoothly guided on the sewing machine body and on the conveying device body 2? The strip τ is inserted into the dagger belt through the strip guide rod 12: = The strip τ derived from the lower side of the rollers 5, 6 passes through the strip;: the bow "guide 19" is inserted into the cloth presser 4 With a bar number: Guide under the cloth presser 4. The retainer 16 is placed on the upper surface of the needle plate (not shown), and the cloth is held between the lower surfaces. The needle plate is provided with = pressure: Zhongweibu) 'The conveying tooth moves in an ellipse, thereby conveying the cloth to the rear while moving up and down. The belt wheel passes the stepper motor 7 to make the large roller 5 Rotate 'and send the band like it, the government will set it up ^

593825 V. Description of Invention (7)

: Second: Second ’s stitching is too much. ... At the same time, when the strip T § π is an elastic band, etc., the conveying speed of the strip relative to the fabric is slow, so that the fabric can be sewn to the fabric at different speeds, and can be in the state of tension; The speed and the belt feeding speed make the roundness r of the cloth uniform, controlled by: two = stitching. Here is the electrical connection of the 2 疋 π conveying device: " 2 ^: The rotation of the drive shaft of the sewing machine: 2im The light-emitting element and the cloth of the machine: the sensor is sandwiched by the needle plate The configuration ^ ^% Λ ^ ^ ^ ^ ^ starts sewing or ends sewing. ’Sense sent by the judge

Mt. 'Making the palms with the seams of the women's shorts shown in Figure 3' t. In Figure 3, · = as an example, let's say that the strip T is sewn to the fabric 3 丨. As above =:- When the tape T of the side elastic band is tightened, the tape is sewed by applying two forces; not = tension can be made flat, which means that the conveying speed of the tape T is slowly given to the tape T sheet: set π: : ι: The clips that produce rrr child 5 and 6 are stretched to make tension with the system, and in this state are sewn to the fabric Λ 593825 Description of the invention (8) After this system is made, the strip τ shrinks when there is no load. To make the fabric wrinkle and sew together, stitch the tape on both sides of the fabric 31, in the range of -side. Heart 2 m :: Fan; and flat, unwrinkled, without the crease, the stitching process will be divided In step 1 of one side of the U fabric 31, 'from the upper right to the lower right area 2' is a flat V / enclosing area. The area 1 is a flat area, and a wrinkle is added to the area 2. / Sew the strips τ, cut the strips to the cloth 31 into a Si cutting knife (not shown in the figure), cut the strips to the top right, and start from the bottom left in the Weixian 2 on the left side of the zone. Fang Erfan, who is a flat fan; encircle the band 5 in the area 5 and sew the tape T in a sturdy manner. According to the regulations ::::: 丄 For different tape stitching procedures 1 , 2 Whether to perform the sewing with force:,; Inspection: During the sewing process, whether the tape T is allowed to be within the allowable range w A degree relative to a predetermined length 'whether it is judged as passing or failing. It is sent out, heart U :: sent out The strip T is generated by rotating the roller 5. In other words, the length of the strip T sent out between the clamping position β ′ and 6 and the sewing position is measured. Therefore, the length of the strip sent by the rotation amount of the comparator 5 is measured. Therefore; Passing inspection is the same as when the strip is sewn without load after the sewing without load:;: T's sending length ', the length of the strip in the sewing operation can be detected. The present invention uses this to record The feed length of the control box 3 will be checked after the sewing has been completed. 593825 V. Description of the invention (9); The tape length determined by m is compared. The receiver is referred to the structure of the control box 3 shown in FIG. The block diagram in Figure 3 illustrates the ^-^? ^ ^ ^ ^ ^ ^ ^ ^ 3 zones. In the example, the tape stitching process on the right side is checked when ~ zone 3 is completed. In zone 1 the control unit 30 is combined with the control unit, body, and tape. Conveying the pulse memory with: belt; memory of various setting values for various setting values, with belt: 2 sending conveying pulse recorder. Make length setting value L1 ~ Ln. These 2: π 1 ~ Sn and belt conveying lv ^ ®iq ^ I two values set according to different areas, so in the case shown in Figure 3, corresponding to the binary value

Each. In addition, as a set value, a length error setting = each is set by a control panel connected to the control box 3. A output S 3 丄 Ϊ 口 Mouth: 3 out 0 ΐ: continuous stepping motor 7 at a constant interval-4 pulses per-time;: = :: predicate = the above-mentioned speed with which you touch. In other words, by setting the crease, the feed speed is slower than the conveying speed of the cloth. It can be overtime, and the flatness can be set in the same way as the conveying speed of the cloth. Shape: The way to set the belt wheel feed amount. The dagger fantasy UU adds a crumpled strip to convey the long sound B and set the length. The length and the length of the strip which should be stitched in each field are set by the number of pulses. Conveyor belt

593825 V. Description of the invention (ίο) 1 --- The pulse of the rich phase is 0.2mm. When transporting a band of 50 bands, it is set to 250 pulses because it is 50 / 0.2 = 250. The length of the belt conveyance = setting, can be calculated and set by the operator, or it can be set to only the length of the belt in each area. For the above calculation within the control unit, ^ the conveying length error setting value w, It is the allowable value of the difference between the conveying length of the strip when the fish is being sewn. In this embodiment, the allowable value of the difference between f j and the actual belt conveyance length in the areas i to 3 is set. ϋ In addition to the above-mentioned set values, the control unit 30 also inputs the tape conveyance switch switch signal SW, the sewing start signal ST, and the sewing end signal. The tape conveyance switch switch signal SW is described below in the column of this embodiment. i input, the belt conveying switch signal sw moves to the next field after turning in. 0 ΡΡ, ί Open = is the signal indicating the start of sewing. The sewing end letter says that SP 疋 indicates the end of sewing. In this fabric, Sensor input. In addition, the "# 在 丨": k 2 L 疋 疋 is used to iron the signal sent from the sewing machine pedal, but it can also be a signal, for example. 5 This is the start of sewing and the end of sewing. The pulse G is output from the control unit 30 as the output of the belt. The pulse is sent out. 2 = Conveying signal C, warning indication signal A. Strip: The length of the strip indicates the signal. The signal pulse B is for the stepper motor 7 :: pulse :: and the reverse feed of the strip.

593825 Fifth invention description (11) 2 quantity, and after the belt reverse conveying signal pulse B is input to the stepping motor 7, the belt τ conveys the quantity of one pulse of the motor in the reverse direction. For example, if you switch from the flat sewing area 1 to the wrinkled area 2 ^ In zone 1, make the strip T no tension, and start from area 2 to make it ^ Yu Taisuo§ Add the stomach fold as described above It means the conveying speed of the belt T. Since the tension is generated from the cool holding position of the parent-child 5, 6; the belt τ is extended between the positions, so when the area 1 is used for = 2 and 2, if only the switching is performed to make the belt conveying speed Slow down until the tension produced is not sufficient; the point in time of switching prevents the band τ from forming sufficient wrinkles. At the moment when the actual position can be at the initial position 2 of the area 2, the roller 5 is temporarily reversed, and the tension of u 5 is switched to add wrinkles. The reverse feed signal pulse B is output at the instant when such a region is switched. Λ Dazheng 2 is a belt conveying pulse recorder built in the control unit 30. When the pulse is 马 Γ, add 1 to it, and when the motor rotates one pulse, it will go to 1. The belt conveying long Tang 矣 + Yu Gu r u money, the letter 5 输送 of the pulse conveying pulse is input to the control panel to indicate the above belt. In addition, ί ϊ: that is, the conveying length of the belt at the time of sewing is not suitable, and the signal is also input to the control panel, and the operator is warned by lights, beeps, etc. when the inspection result is not good. In the process, the pulse memory is conveyed with a strip, and 11 is under-recorded. The total number of motor pulses is 4 and the number is 6. In addition, when the conveying direction of the belt conveyer to the cloth is reversed, the calculation is reduced. For the operation of the control program combined with the control unit 30, Izumi Izumi ',,,

^ 3825 Do you say it? (22) The flowchart in Figure 5 is used for illustration. In memory J, in step Si, the strip conveying pulse recorder, the strip pulse middle factory, and the strip conveying length indication are set to 0. Next, at step M and whether the sewing start signal ST is input or not, # is not input until input is set at step 3. Judgment of discontinuation, the fabric is sent out, and the belt that is advanced by 1 after the sewing start signal is input is in the loop; "3rd middle" first read the area rotation length error value S1 from the memory in the control unit 30, and the length of the belt conveyance Set the value L1, and the value W of the stripe. In the next step ^, the carousel pulse memory of the value of the total two times at that time and the set value of the tape conveying length read is set as follows. , So punch / Λbody. At this time, the strip L1 is included. If the signal of the belt conveying length setting value in zone 1 comes at ^ :: off, whether the output signal is positive tape rotation or not, proceed to step S6 ;;;; if the rotation amount setting is positive, if it is positive step S9. In step S5, the rain is equal to +1, and the process proceeds to step S7, and it is judged whether or not ^ = when the belt has a positive conveying signal pulse, then the input conveying amount is set to a negative w conveying signal pulse. That is, if it is judged that the strip is negative, it proceeds to step 88. If it is not negative, it proceeds to step S9. If it is negative, it proceeds to step S9. ▼ Subtracting pulse recorder minus 1 and proceeding ... In step S9, it is judged whether the input is not input, and then it goes to step whether the input switch SW is input. If it is not input, it is judged again: Whether the end signal SP turns to return to step S5 and continue to work in area 1

I 2174-4452-PF; ahddub.ptd p. 15 593825

industry. In step S9, the process returns to step S3, and the second step: = is entered. 敁 9 B * Enters the next area, and at this time, it enters the second area. , 卩 ,, take the strip conveying amount setting S2, read the strip conveying length setting 疋 ', and then perform step S4 and subsequent steps. In this way, the sewing operation of the area i to the area 3 is performed, and if the sewing end signal Sp is input in step 8 i 〇, the process proceeds to step si1.

In step S11, it is judged whether the absolute value of the difference between the tape conveyance pulse memory and the tape conveyance pulse recorder is greater than the conveyance length error set value and checked. If it is greater than, it is unqualified, so it outputs warning indication signal A to warn the operator. If it is less than the set value of conveying error, the error is within the allowable range, it is qualified, so it ends without issuing a warning. In this way, a single sewing process, at this time, process 1 of area 1 to area 3 is ended, and the pass or fail is determined by automatic inspection. If it fails, the operator is warned, and the operator does not need to be like It also checks the finished product by manual operation, which improves the operation efficiency. 1. In the above-mentioned embodiment, the conveying length error setting value "

The allowable error of a strip in a single sewing process is not limited to :: It is also possible to calculate the difference in the set length of each area by 5 and hate the error setting values in each area to calculate the white and Degree error setting value. γ A α system In addition, in this embodiment, the pass or fail is not satisfied ^ One area is performed at the end of the process, but it is not limited to this, and it is checked at the end of the parent company #standby. In this case, the delivery length depends on

V. Description of the invention (14) Regional settings. At this time, a warning is issued at the same time as the end of the area. 'V, what is the switch switch signal of the telecast switch In this embodiment, the zone switch 3 is switched by the strip switch switch signal, and the k 4 ^ touch switch issues a switch input switch signal. Through other switching, and by the number of needle movements, each pulse can be used without the switch to perform the pulse encoding of the area rotation number. Checking = The number of needle movements recorded to switch between regions. According to another 'strip strip in this embodiment: from above, the strip side j 供给 is supplied from the top of the fabric to be mounted on the throat plate, or it can be from the bottom of the throat plate # 仏 1? Restricted underside. ',, $ f strips' stitch the strips to the cloth. In addition, in this embodiment, the elastic band with a stretchable elastic band can also be compressed and tightened, but it is not limited to the strip shape such as a strip. ς :::: strip :: step: step 'and when 2 pieces of sewing material are sewn, check the gray on the fabric, or you can take the length of the bundle with the given # L ghost cloth, and shoot at the sewing agency: Degree Compare for inspection. According to the above-mentioned sewing items such as objects, at the end of sewing, the belt can be automatically compared by comparing the band width. ^ A pre-recorded predetermined feed length is thus completed at the end of sewing; otherwise, the sewing is performed. Check. Husband to improve operational efficiency. "It can save the labor required for manual inspection. In addition, according to the present invention, it is possible to correspond to sewing two" with a predetermined length arbitrarily set, and a predetermined length arbitrarily set in the inner valley of the body. 593825 V. Description of the invention (15) In addition, according to the present invention, since the allowable amount of the difference between the specified feed length and the actual feed length can be arbitrarily set, the allowable amount can be arbitrarily set in accordance with the required accuracy of the finished product. In addition, according to the present invention, since it has a transmission by a comparison device Conveying device that compares the results, so that when the length of the sewn product exceeds the allowable length compared to the predetermined length, the operator can be warned by sound or light, etc. A perspective view of the use state of the device body; FIG. 2 is a perspective view of the overall configuration of the belt conveying device; FIG. 3 is a schematic view of an embodiment of a sewing operation; FIG. 4 is a control block diagram of a control box; Control flow chart of the device. Symbol description 1 ~ belt conveying device; 3 ~ control box; 5,6 ~ roller; 8 ~ carriage; 10 ~ roller mounting table; 1 ~ 3 belt clamping force adjustment; 16 ~ belt supply guide 2 ~ conveyor body; 4 ~ cloth presser; 7 ~ stepping motor; 9 ~ detection Sewing machine body; 12 ~ strip guide rod; 15 ~ strip guide rod; 17 ~ support shaft;

2l74-4452-PF; ahddub.ptd Page 18 593825 V. Description of the invention (16) 1 8 ~ Strip guide stopper 2 0 ~ Signal line; 2 2 ~ Pulse encoder; T ~ Strip (ribbon ) ≪ 1 9 ~ Guide; 2 1 ~ Knee-touch switch 3 0 ~ Control;

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Claims (1)

593825 VI. Scope of patent application_ 1 · A sewing machine, which is characterized in that it covers the body of the sewing machine to perform the sewing operation; send out the length detection device, 仏 tⅡ, 々 brand stationery-detection of the sent out county defense · Recording device, recording the advance phase, output length, and the predetermined delivery length of the current quilted product in M yuan; with the comparison device, at the end of the sewing operation, the delivery length of the sewing product detected by the upper testing device is compared with that of U = Of the given send length. The recorded seam 2. According to the patent application scope No. 1JS, the juvenile mechanism is a ribbon, and the belt with the t to send out the above-mentioned belt is described by the above-mentioned length detection device to detect the out of the belt 2 The length of the belt; the main body of the sewing machine that is put out to carry out the sewing operation of sewing the belt to the cloth; < the length of the existing delivery is the length of the belt that should be sewn to the cloth. 3. The sewing machine according to item 1 or 2 of the scope of patent application, which has a predetermined length setting device that can be used for both a predetermined feed length and recorded by the recording device. 4 · The sewing machine according to item 1 of the scope of patent application, which has an allowable amount setting device that can arbitrarily set the difference between the feed length detected by the feed length detection device and the predetermined feed length recorded by the recording device. . 5 · The sewing machine according to item 2 of the patent application scope, which has < 2l74-4452-PF; ahddub.ptd Page 20 593825, Patent scope of Λ, ^ set the detection by the sending length ^ = set the recorded sending length ΐ = sending length and break with the above. The allowable amount of the difference between the allowable amount is set to true ηw ~ mouth, lining silicon, | · If the scope of the patent application is the third item 2 Γ ... send out the length inspection just installed: inspected: possible machine 'which has a record of ~ can be completed The given sending length of / and the sending length is determined by the above-mentioned device. The allowable amount of the allowable amount of the degree difference is set to 7. The comparison device compares the sewing length detected by the feed-out length detection device as described in the first item of the patent application scope. The conveying device that conveys the result after °°, the intended delivery length of the sewing product is 8. The sewing device described in item 2 of the scope of patent application ^ ^ The above comparison device compares the length of the sewing machine with the feed length detection, which has A conveying device that conveys the result after the length is taken out and J = the degree of the sewn product produced by the recording device. The predetermined delivery length of the seam argon is 9. The seam description comparison device described in item 3 of the scope of the patent application compares the length of the seam detection device, and transmits it after the eighth degree; ii Sets the recorded seam The intended delivery device is a long and convenient delivery device that transmits the results. The poor, 10. The sewing machine according to item 4 of the scope of patent application, wherein the comparison of the sewing length detected by the feeding length detecting device with the sewing length recorded by the recording device is performed in the comparison. A transmission device that transmits the result after a predetermined transmission length. β + ϋ 11 · Sewing machine as described in item 5 of the patent application 2174-4452-PF; ahddub.ptd Page 21 593825 VI. Patent application scope i ΐ: ί? Compare the length of the j = detected by the feed length detection device with the length of the sewing object recorded by the recording device. A transmission device that transmits the result. 12. The sewing machine according to item 6 of the scope of the patent application, where the comparison of the length of the sewing product recorded by the above-mentioned recording device and the length of the length J detected by the sending-out length detection device is compared with the transmission of the result. Device. Ij. A ribbon feeding device, characterized in that it includes a Y-shaped feeding device, which is used to feed the suture to a sewing machine; and a length detection device is provided to pick up the ribbons of μ, + w, Detecting the length of the tape from the upper tape to the recording device, recording the predetermined length of the tape to the predetermined length setting device, and setting the predetermined length of the tape in the recording device; the comparison device 'compares by the above recording' Set the recorded feed length difference detected by the above-mentioned feed length detection device; "setting device, set the feed length detection device degree, and the predetermined feed length allowance recorded by the above-mentioned recording device; and Conveying device, the length difference calculated by L in the sewing production hall is set to ::: 2 ', and the result is sent from 5. The result is that the fixed length of the allowable product of the upper limit allowance setting device is sewn. The belt-shaped device that sends out the long material is set to send out the length; the upper part is set to send out the length and calculates the amount of the difference between the degrees detected by the length. 593825 VI. Scope of patent application 1 4. A method for controlling a sewing machine, which comprises: recording a predetermined feed length that is set in advance; detecting the feed length of the material being sent; and comparing the recorded data at the end of the sewing operation Is the difference between the predetermined feed length of the sewing product and the detected feed length of the sewing product within the preset allowable range? 2l74-4452-PF; ahddub.ptd Page 23