CN1338535A - Wire off inspector for sewing machine - Google Patents

Abstract

Reflecting type photoelectric sensors for individually detecting the presence of edge parts of upper cloth and lower cloth are provided in the upper and lower positions of a throat-plate in a front position of a female mechanism in a sewing proceeding direction, and regression reflection tapes for reflecting projected light from the photoelectric sensors upward and downward are bonded to the upper and lower faces of a sewn cloth guide member interposed between the upper and lower cloth. A detecting means is further provided to act for determining the presence of the missing stitch of the sewn cloth by processing detection signals of both upper and lower photoelectric sensors. To positively and accurately detect a missing stitch without needing complicated sensitivity adjusting work even in the case of sewing any kind of cloth with different thickness and light transmission characteristics.

Description

The wire off inspector of Sewing machines

Technical field

The present invention relate generally to be used for when the overlock machine bound edge stitches at least one side's of two-layer sewing end, cloth limit up and down whether depart from fixed sewing position carry out optical detection and with its inform the makers-up, with the wire off inspector of the Sewing machines that prevents to produce the poor stitching quality product.

Background technology

When the overlapping up and down sewing bound edge seam that carries out overlock machine etc. is made, particularly be difficult to see clearly the correction position of making the lower layer mix feeding in the way because of making the operator, so take place easily its end, limit occur breaking away from the off normal of the cloth width of making the direction of advance quadrature fixed sewing position (stitching) be so-called off-line phenomenon, this off-line is fatal defective concerning sewings.

As the device of optical detection off-line to prevent that the poor stitching quality product from producing, known have a real public clear 59-25349 communique of Japan Patent, and it is the structure that a kind of photoelectric sensor that adopts the light transmission formula detects off-line.Disclosed traditional wire off inspector such as above-mentioned communique adopts a kind of photoelectric sensor of the light transmission formula that light-receiving device constituted by the light projector of sewing being thrown light and the corresponding light of accepting to see through sewing with this light projector, and it constitutes by the lamination number that detects sewing is that overlapping whether the changing of upper strata cloth and lower layer mix feeding causes that the increase and decrease through light quantity detects off-line.

Yet, because when the traditional wire off inspector of the photoelectric sensor that adopts the light transmission formula, detect by the increase and decrease that sees through light quantity and to have or not off-line, therefore, when each thickness sewing kind different with the light transmission characteristic changes, must before operation, carry out sensitivity (revisal) operation of trouble and time-consuming photoelectric sensor, make the wire off inspector of the Sewing machines of usefulness, exist the not good problem of practicality as the cloth of a small amount of many kinds.

Summary of the invention

The present invention in view of the above problems, its purpose is, when making the thickness any kind of cloth different, do not need the sensitivity adjustment operation of trouble even provide a kind of with the light transmission characteristic yet, and can be reliably and correctly detect the wire off inspector of the Sewing machines that off-line takes place.

For achieving the above object, the wire off inspector of the Sewing machines of the present invention's the 1st technical scheme, it constitute the pin portion that falls that is arranged on the needle plate near, and to the end, limit of overlapping up and down sewing whether depart from fixed sewing position carry out optical detection, it is characterized in that, on the position, above and below of needle plate, be respectively equipped with separately the reflective photoelectric sensor of the end, limit of detecting the end, limit that has or not the upper strata cloth and lower layer mix feeding, and be provided with from these up and down photoelectric sensor light projector light respectively upward with the reflecting part of below reflection, in addition, also be provided with and judge by the processing of two kinds of detection signals of reflective photoelectric sensor up and down and to have or not off-line, and this result of determination of root a tree name detection means of moving.

Adopt the present invention of the 1st technical scheme, have or not the overlapping up and down upper strata cloth and the end, limit of lower layer mix feeding owing to detect respectively, judge by the processing of these two kinds of detection signals and to have or not the sewing off-line, this result of determination of root a tree name is moved, therefore, even will make the different any kind of cloth of the intrinsic light transmission characteristic of thickness (thickness) and cloth when making object, do not need to carry out in advance the sensitivity adjustment of the photoelectric sensor of trouble yet, can be reliably and the off-line that departs from deciding sewing position that detects correctly that the end, limit of a side in upper strata cloth and the lower layer mix feeding produces.

The 2nd technical scheme of the present invention is in the wire off inspector of the Sewing machines of said structure, preferably up and down reflective photoelectric sensor is arranged on and makes position, front direction of advance,, the cutter mechanism more close operator that cut off neater than the end-grain cutting of sewing limit, can adjust this reflective photoelectric sensor position up and down, make that itself and the cutter mechanism of the direction of making the direction of advance quadrature move trim, the adjustment of off-position is consistent.

Adopt the present invention of the 2nd technical scheme of said structure, on the basis of above-mentioned effect, when carrying out bound edge seam width adjustment by cutter mechanism mobile, can be simultaneously with two photoelectric sensor positions up and down be adjusted to the trimming of cutter mechanism, off-position corresponding fixed detection position, need not adjust bound edge seam width also can reliably keep fixed off-line measuring ability.

In the 3rd technical scheme of the present invention, because being the photoelectric sensor with downside, the structure of photoelectric sensor position adjustment usefulness is bearing on the lower cutter platform of cutter mechanism, can be along with trimming, the lower cutter platform of off-position adjustment usefulness moves, the photoelectric sensor and the lower cutter platform one of downside are carried out the position adjustment, therefore, can make the position adjustment amount of photoelectric sensor of lower cutter platform amount of movement that bound edge seam width adjustment uses and downside in full accord, after bound edge seam width adjustment, do not need to adjust in addition again the photoelectric sensor position of downside, carry out bound edge seam width adjustment guaranteeing under the state of fixed off-line measuring ability easily and promptly.The photoelectric sensor of upside since be with along with the lower cutter platform move position adjustment integratedly, be that benchmark carries out the position and adjusts from the light projector light of downside photoelectric sensor, therefore, can be easily and correctly adjust after the bound edge seam width adjustment fixed detection position.

The 4th technical scheme of the present invention is in the wire off inspector of the Sewing machines of said structure, photoelectric sensor as the downside at least in the reflective photoelectric sensor up and down uses Fibre Optical Sensor, by this Fibre Optical Sensor is fixedly supported upon on the lower cutter platform of cutter mechanism, decides guaranteeing also the photoelectric sensor of downside to be installed under the state of sensing function and make the not spacious and comfortable position of installing space with parts because of existing cutter mechanisms such as lower cutter platform.

The 5th technical scheme of the present invention is in the wire off inspector of the Sewing machines of said structure, since adopted will from the light projector light of photoelectric sensor up and down respectively upward and the reflecting part of below reflection be formed on respectively between up and down between cloth and guiding up and down cloth to the top and bottom of making the sewing guiding elements that direction of advance moves, therefore, even thin cloth, also can not make under the lax state that waits of cloth up and down, move along the guiding elements channeling conduct, and can guarantee to produce upward reflex with the light projector light of below, improve the detection performance that has or not end, cloth limit of two photoelectric sensors up and down.

The 6th technical scheme of the present invention is in the wire off inspector of the Sewing machines of the guiding elements of reflecting surface about above-mentioned having is with, because guiding elements can and leave free change of location between the non-guiding function position of needle plate in sewing guiding function position, therefore, even object to be sewn is a tubular article, guiding elements can not hinder that fixed make yet, and can not hinder the taking-up of the sewings after making yet.Promptly, when arriving pin portion front in the end of making beginning of carrying out tubular article, owing to make guiding elements location change (yielding) to non-guiding function position, therefore, make the beginning end and can not colluded on guiding elements, can guarantee that sewing to sewing finishes the end, and, tubular article after making can be taken out from making the position under the prerequisite that does not hinder guiding elements, this wire off inspector can be applicable to effectively that also tubular makes thing.

Again, as the reflecting part of the wire off inspector of the Sewing machines of said structure, shown in the 7th technical scheme, the simplest a kind of be to form by the retroreflecting band, and can obtain the reliable detection function, but in addition, also can be for example the top and bottom of guiding elements be formed reflecting surface after mirror finish.

Again, shown in the 8th technical scheme, as photoelectric sensor up and down, used in the front of its light projector and photo detector and had the polarisation filter respectively, can only carry out the light projector of horizontal or vertical light wave by the polarisation filter in the light projector side, and can only carry out the photoelectric sensor of the retroreflecting type that is subjected to light of vertical or horizontal reflecting light by the polarisation filter at sensitive side, used again simultaneously will from these up and down photoelectric sensor light projector light as upward with the reflecting surface of the described reflecting part of below reflection, have the light that the light wave laterally or longitudinally of light projector can only be departed from all directions and carry out the retroreflecting band of function of reflecting, therefore, even exist glossiness object and position in the light projector position, or the light reflective of cloth itself is very strong, also can distinguish clearly from these reflected by objects light (light at random) or from the reverberation of the zone of reflections, like this, photoelectric sensor just can be only has or not the end, limit of cloth up and down and makes correct detection up and down, the detection of mistake and wrong detection action can not appear, can improve significantly fixed off-line accuracy of detection.

Other purpose of the present invention and effect can give in the embodiment of following explanation clearly.

The accompanying drawing simple declaration

Fig. 1 is the approximate three-dimensional map with overlock machine major part of wire off inspector of the present invention.

Fig. 2 is the vertical view of the same Sewing machines major part.

Fig. 3 is the front view of the same Sewing machines major part.

Fig. 4 is the right side view of the same Sewing machines major part.

Fig. 5 is the exploded perspective view of the cutter mechanism detailed structure major part in the same Sewing machines.

Fig. 6 is the block diagram that comprises the wire off inspector loop structure of reflective photoelectric sensor up and down.

The flow chart of the wire off inspector when Fig. 7 stitches for the explanation bound edge.

The summary side elevation of the detected status of the end, the limit of cloth up and down when Fig. 8 (A), (B) are respectively explanation bound edge seam.

The specific embodiment

Below, with reference to the example of description of drawings the 1st to the 8th technical scheme of the present invention.

Fig. 1 is the approximate three-dimensional map with overlock machine M major part of wire off inspector of the present invention, and Fig. 2 is the vertical view of this Sewing machines M major part.On the fabric swatch 1 of this overlock machine M, be fixed with needle plate 2, above it be in above the fabric swatch 1 with the one side.On the bottom of this needle plate 2 and front and back position in the pin portion 6 that falls of clamping eedle (not shown), be provided with the sewing W that will overlap up and down along shown in the arrow Y make the direction of advance feeding before, back feed dog is (because of well-known, not shown), pin portion 6 is installed in the bottom of easy on and off reciprocating motion ground by the shank 4 of sewing machine frame 3 supportings by pin folder 5 but this falls, simultaneously, top at described needle plate 2, can be provided with presser feet 7 up or down by presser feet handle 8, described presser feet 7 with sewing W by be pressed in this needle plate 2 above, by feed dog on one side with sewing W along making direction of advance Y feeding, rely on the mating reaction of eedle and not shown looper to carry out bound edge on one side and stitch operation.

On making of described needle plate 2 positions, front direction of advance Y, than the 6 more close operators of pin portion that fall, the cutter mechanism 9 that is provided with above fabric swatch 1 and needle plate 2, the limit end of the sewing W that makes direction of advance Y feeding of the pin portion that falls is trimmed, cuts off usefulness, this cutter mechanism 9 trims to moving with the X1-X2 direction of making direction of advance Y quadrature, can adjusting by making, off-position is bound edge seam width.The adjustment structure of the concrete structure of this cutter mechanism 9 and bound edge seam width is as follows.

Promptly, as described in Figure 5, with the main shaft that is fixed in overlock machine (because of well-known, not shown) on the upper cutter armshaft 11 of the swing of the upper cutter axle 10 of interlock, be equipped with and can move the fixing upper cutter anchor clamps 12 of L font freely by hold-down screw 13 and slotted hole 14 along arrow X1-X2 direction, and be equipped with these upper cutter anchor clamps 12 side butts after, can carry out the tabular upper cutter 9A that upper-lower position is adjusted by bolt 15 and slotted hole 16.

In addition, lower cutter platform erecting bed 17 upper supports that are fixed on fabric swatch 1 bottom in configuration have lower cutter platform 19, this lower cutter platform 19 is by the interior spring 18 that is contained in described erecting bed 17, the X1-X2 direction that is in and makes direction of advance Y quadrature applies the state of elastic force to upper cutter 9A side, lower cutter 9B with band plate-like fixedly remains on this lower cutter platform 19 through lower cutter presser feet 20 and hold-down screw 21, is provided with the elasticity that makes lower cutter platform 19 overcome spring 18 simultaneously and applies power and can be fastened on hold-down screw 22 on the lower cutter platform erecting bed 17.Among Fig. 5 23 is spline members of lower cutter platform 19, is fixed on the lower cutter platform erecting bed 17 by hold-down screw 24.

In the cutter mechanism 9 of said structure, unclamp hold-down screw 13, upper cutter anchor clamps 12 and upper cutter 9A are fixed after moving aequum with the X1-X2 direction of making direction of advance Y quadrature along slotted hole 14, unclamp hold-down screw 22 again, utilize the elastic force of spring 18 or overcome the elastic force of spring 18, make lower cutter platform 19 and lower cutter 9B along moving, make up and down two cutting knife 9A, the driving fit of 9B elasticity, can adjust bound edge thus and stitch width with above-mentioned the same X1-X2 direction.

Again as shown in Figure 3 and Figure 4, on the position, above and below of the needle plate 2 of position in front of the more close operator who makes direction of advance Y than above-mentioned cutter mechanism 9, be respectively equipped with reflective photoelectric sensor 25,26.Described reflective photoelectric sensor 25,26 has or not the end, limit of upper strata cloth Wu and lower layer mix feeding Wd by the reverberation to the light of upper strata cloth Wu and lower layer mix feeding Wd light projector is respectively detected whether be subjected to light with judgement.In two reflective photoelectric sensors 25,26 up and down, not spacious and comfortable in installing space as the photoelectric sensor 26 of downside because of lower cutter platform 19 members such as cutter mechanism such as grade that exist above-mentioned cutter mechanism 9, so used Fibre Optical Sensor.

As shown in Figure 1, the reflective photoelectric sensor 25 of upside is by reaching the bolt 29 chimeric with it with the slotted hole 28 that is formed on the sensor hold-down arm plate 27, fixing be installed on the Sewing machines housing 3 under the state freely moving with the X1-X2 direction of making direction of advance Y quadrature, and can adjust sensing location, make it adjust corresponding with the trimming of above-mentioned cutter mechanism 9, off-position (bound edge seam width).

In addition, extremely shown in Figure 4 as Fig. 2, the downside photoelectric sensor 26 that is made of Fibre Optical Sensor passes through optic fibre adminiculum 30 and fiber pressuring plate 31, be fixedly supported upon on the lower cutter platform 19 of cutter mechanism 9, moving of the X1-X2 direction of the lower cutter platform of using along with above-mentioned Fibre Optical Sensor 19 can be carried out the sensing location adjustment integratedly with lower cutter 9B and lower cutter platform 19.Be formed with the guide groove 32 of slotted hole shape in needle plate 2 parts in the face of test side 26a of the photoelectric sensor 26 of downside, even when photoelectric sensor 26 and lower cutter platform 19 being moved to a certain position of X1-X2 direction integratedly for bound edge seam width adjustment, also can guarantee with lower layer mix feeding Wd fixed sensing function.

Again, between upper strata cloth Wu and lower layer mix feeding Wd, be separated with the upper and lower layer of guiding cloth Wu, Wd to making the tabular sewing guiding elements 33 that direction of advance moves, the top and bottom of this guiding elements 33 are bonding with retroreflecting band 34,35 respectively, formation will from the light projector light of up and down photoelectric sensor 25,26 upward with the reflecting surface (reflecting part) of below reflection.

Have this up and down the guiding elements 33 of the zone of reflections 34,35 be installed in the leading section of the movable rod 38a of flexible (advance and retreat) cylinder body 38, described flexible (advance and retreat) cylinder body 38 is installed on the sewing machine frame 3 by installing plate 36 and pedestal 37, rely on the expanding-contracting action of cylinder body 38, make its front end and leave between the non-guiding function position of needle plate 2 change of location freely in the sewing guiding function position of extending on the needle plate 2.

Fig. 6 is the block diagram that comprises the wire off inspector loop structure of described reflective photoelectric sensor 25,26 up and down.Detection signal S1, S2 by each photoelectric sensor generation are up and down being amplified back input control parts 42 by amplifier 40,41.In this control part 42 except detection signal S1, S2, also input has respectively: from overlock machine M for example be installed on the main shaft (not shown), detect have or not the detection signal S3 of rotating rotating detector 44 and in advance by the input of operator's data handle the needle several, from the off-line amount of allowing (number of handling the needle) the setting signal S4 of photoelectric sensor 43, the what is called number of handling the needle is meant the off-line amounts of allowing along the certain-length scope of making direction of advance Y.The number of handling the needle that is equal to the signal input duration of a certain side among detection signal S1, the S2 of this control part two photoelectric sensors about in the of 42 pairs is handled the needle to count with allowing of setting signal S4 and is made comparisons, when the detection number of handling the needle surpasses and to allow and handle the needle when several, be judged to be off-line, output signal S5.

Be connected with above-mentioned control part 42 by at least 1 in signal lamp, buzzer or display panel off-line device for informing 45 that constitutes, after the output signal of accepting from above-mentioned control part 42 5, make the demonstrations such as literal of the bright lamp of signal lamp, photoelectric sensor buzzing or panel, inform that off-line has taken place the operator.Above-mentionedly allow that the off-line amount can change arbitrarily by several setting of handling the needle, but also can not adopt this number of handling the needle, change timer into, from with the input of a certain side detection signal S1, the S2 of above-mentioned two photoelectric sensors 25,26 control part 42 the time light and begin action, change the off-line amount of allowing by the action time of prescribing a time limit of setting this timer.

Below with reference to the action diagram of the flow chart of Fig. 7 and Fig. 8 (A), (B), use is had said structure Sewing machines wire off inspector overlock machine M, carry out T-shirt for example on wire off inspector during sleeve seam etc. do a simple declaration.

For example the sleeve of T-shirt with cloth and garment piece with cloth etc. like that, by forward and backward feed dog sewing W the going up that upper strata cloth Wu and lower layer mix feeding Wd is overlapping up and down along fabric swatch 1 and needle plate 2 towards making direction of advance Y feeding, and deliver to pin portion 6 after the position is trimmed its limit end We, cut off by cutter mechanism 9 in front of the operator of the pin portion 6 that falls, the interoperation by eedle and not shown looper carries out the bound edge seam.

When above-mentioned bound edge is made, having up and down, the guiding elements 33 of the zone of reflections 34,35 makes its front end be in the sewing guiding function position of extending on the needle plate 2 by cylinder body 38, even sewing W is thin material, also up and down cloth Wu, Wd along guiding elements 33 and in that not produce under the lax state guiding mobile.And, the light that the pulse type of launching from reflective photoelectric sensor 25,26 is up and down arranged is thrown in the end, limit of the upper strata cloth Wu of locational sewing W and lower layer mix feeding Wd in front of the more close operators than cutter mechanism 9, by detecting the end, limit (step S11, S12) that known by light to have or not levels cloth Wu, Wd.

At this, as shown in Figure 8, owing to all be in the state that exceeds light projector light right side scope in the end, limit of upper strata cloth Wu and lower layer mix feeding Wd, photoelectric sensor 25,26 is not accepted reverberation up and down, detection signal S1, S2 that end, cloth limit is arranged to control part 42 inputs from these photoelectric sensors 25,26, in the control part 42 of importing these detection signal S1, S2 that end, cloth limit is arranged, signal by these detection signals S1, S2 is handled, be judged to be no off-line (step S13), do not enter next step, this proceed the operation of fixed bound edge seam.

On the other hand, shown in Fig. 8 (B), in upper strata cloth Wu and lower layer mix feeding Wd a certain side's end, limit for example the end, limit of upper strata cloth Wu be offset to than light projector light more the left side state under, from the light projector light of upside photoelectric sensor 25 from reflecting upward with the zone of reflections 34 that engages above the guiding elements 33, make upside photoelectric sensor 25 be subjected to light, import detection signal S2 that cloth limit end arranged to the detection signal S1 of control part 42 input ends, no cloth limit or from this downside photoelectric sensor 26 to control part 42 from this upside photoelectric sensor 25, by these detection signals S1, the signal of S2 is handled, and has been judged to be off-line (step S13).

With in advance by operator's data inputs photoelectric sensor 43, import in the described control part 42 along the off-line amount of allowing of making the length of direction of advance Y several setting signal S4 that promptly handle the needle, to allowing of this detection signal S4 detection that is equal to the signal input duration of several M1 and detection signal S1 (or S2) several M2 (step 14) of making comparisons of handling the needle of handling the needle, when detection is handled the needle several M2 less than allowing when handling the needle several M1, output signal S5 not; When detection several M2 that handle the needle exceed and allow and be judged to be off-line has taken place, from control part 42 output signal S5 (step S15) when handling the needle several M1.Because therefore the output signal S5 of this control part 42 input off-line device for informing 45, makes the demonstrations such as literal of the bright lamp of signal lamp, photoelectric sensor buzzing or panel, inform that off-line has taken place the operator.

As mentioned above, employing is separately positioned on the locational reflective photoelectric sensor 25,26 in above and below, to having or not the overlapping up and down upper strata cloth Wu and end, the limit Wd of lower layer mix feeding to detect respectively, the off-line that has or not sewing W is judged in processing by these detection signals, this result of determination of root a tree name makes apparatus for placing 44 actions, thus, even when making the cloth of the different any kind of of the intrinsic light transmission characteristic of sewing W thickness (thickness) and cloth, also the sensitivity adjustment of photoelectric sensor 25,26 needn't carried out in advance; No matter be upper strata cloth Wu and lower layer mix feeding Wd the off-line that its end, limit is deflected away from from deciding sewing position has taken place in which side, also can reliably and correctly detect.

As shown in this embodiment, because the photoelectric sensor 26 of downside is by lower cutter platform 19 supportings of cutter mechanism 9, along with trimming, moving of the lower cutter platform 19 of off-position adjustment usefulness, downside photoelectric sensor 26 and lower cutter platform 19 one can be carried out the position adjustment along the X1-X2 direction, therefore, can make the position adjustment amount of photoelectric sensor 26 of lower cutter platform 19 amount of movements that bound edge seam width adjustment uses and downside in full accord, and after bound edge seam width adjustment, do not need to adjust in addition again photoelectric sensor 26 positions of downside, can be guaranteeing carry out bound edge seam width adjustment easily and promptly under the state of fixed off-line measuring ability.The photoelectric sensor 25 of upside is owing to be after carrying out the position adjustment integratedly along with moving of lower cutter platform 19, with the light projector light from downside photoelectric sensor 26 is benchmark, fixedly adjust sensing location by the slotted hole 28 that on sensor hold-down arm plate 27, forms and the bolt 29 chimeric moving with the X1-X2 direction of making direction of advance Y quadrature with it, therefore, can be easily and correctly adjust after the bound edge seam width adjustment fixed detection position.

Again, because guiding elements 33 can and leave free change of location between the non-guiding function position of needle plate 2 in above-mentioned sewing guiding function position, therefore, even object to be sewn is a tubular article, when the end of making beginning of carrying out tubular article arrives pin portion 6 fronts, make guiding elements 33 location change (yielding) to non-guiding function position by cylinder body 38, therefore, making the beginning end can not colluded on guiding elements 33, can guarantee that sewing to sewing finishes the end, and, the tubular article after making can be taken out from making the position under the prerequisite that does not hinder guiding elements 33.

And, as photoelectric sensor 25 up and down, 26, used in the front of its light projector and photo detector and had polarisation filter (not shown) respectively, can only carry out laterally the light projector of (or vertically) light wave by the polarisation filter in the light projector side, and can only carry out vertically the photoelectric sensor of the retroreflecting type that is subjected to light of (or laterally) reflecting light by the polarisation filter at sensitive side, having used again simultaneously will be from photoelectric sensor 25 about these, 26 light projector light is as the retroreflecting band 34 that reflects usefulness upward with the below, 35, have can only with light projector laterally (or vertically) the light wave light that depart from all directions carries out the retroreflecting band of function of reflecting, therefore, even exist glossiness object and position in the light projector position, or the light reflective of cloth itself is very strong, also can distinguish clearly from these reflected by objects light (light at random) or from the reverberation of the zone of reflections, like this, photoelectric sensor 25 up and down, 26 just can be only to cloth Wu up and down, the end, limit of Wd has or not makes correct detection, the detection of mistake and wrong detection action can not appear, can improve significantly fixed off-line accuracy of detection.

In addition, reflecting part of the present invention is preferably formed by the retroreflecting band 34,35 with above-mentioned polarisation function, but also can use the zone of reflections with this polarisation function and form reflecting surface by the top and bottom of guiding elements 33 being carried out mirror finish.

The present invention relies on the operator to recognize that the situation of off-line gets off to prevent the generation of poor stitching quality product, be described from the structure of this angle the off-line device for informing 44 that is provided with signal lamp, buzzer, display panel etc., but in addition, also can be when detecting off-line additional Sewing machines M move self-braking structure.

Claims (8)

1, a kind of wire off inspector of Sewing machines, it constitute the pin portion that falls that is arranged on the needle plate near, and to the end, limit of overlapping up and down sewing whether depart from fixed sewing position carry out optical detection, it is characterized in that,

On the position, above and below of needle plate, be respectively equipped with separately the reflective photoelectric sensor of the end, limit of detecting the end, limit that has or not the upper strata cloth and lower layer mix feeding,

Simultaneously, be provided with from these up and down photoelectric sensor light projector light respectively upward with the reflecting part of below reflection,

And, also be provided with by the processing of two kinds of detection signals of reflective photoelectric sensor up and down and judge the detection means that has or not off-line and this result of determination of root a tree name to move.

2, the wire off inspector of Sewing machines as claimed in claim 1, it is characterized in that, reflective photoelectric sensor is arranged on and makes position, front direction of advance,, the cutter mechanism more close operator that cut off neater than the end-grain cutting of sewing limit up and down, can adjust this reflective photoelectric sensor position up and down, make that itself and the cutter mechanism of the direction of making the direction of advance quadrature move trim, the adjustment of off-position is consistent.

3, the wire off inspector of Sewing machines as claimed in claim 2, it is characterized in that, the photoelectric sensor of downside is bearing on the lower cutter platform of cutter mechanism, can along with trim, the lower cutter platform of off-position adjustment usefulness moves, and the photoelectric sensor and the lower cutter platform one of downside are carried out the position adjustment.

4, the wire off inspector of Sewing machines as claimed in claim 3 is characterized in that, the photoelectric sensor of the downside at least in the reflective photoelectric sensor up and down adopts Fibre Optical Sensor, this Fibre Optical Sensor is fixedly supported upon on the lower cutter platform of cutter mechanism.

5, the wire off inspector of Sewing machines as claimed in claim 1 is characterized in that, described reflecting part be formed on respectively between up and down between cloth and guiding up and down cloth to the top and bottom of making the sewing guiding elements that direction of advance moves.

6, the wire off inspector of Sewing machines as claimed in claim 1 is characterized in that, the described sewing guiding elements that is formed with reflecting part in top and bottom can and leave free change of location between the non-guiding function position of needle plate in sewing guiding function position.

As the wire off inspector of claim 1 or 5 described Sewing machiness, it is characterized in that 7, described reflecting part is formed by the retroreflecting band.

8, wire off inspector as each described Sewing machines in the claim 1 to 7, it is characterized in that, as photoelectric sensor up and down, used at its light projector, the front of photo detector has the polarisation filter respectively, can only carry out the light projector of horizontal or vertical light wave by the polarisation filter in the light projector side, and can only carry out the photoelectric sensor of the retroreflecting type that is subjected to light of vertical or horizontal reflecting light at sensitive side by the polarisation filter, used again simultaneously will from these up and down photoelectric sensor light projector light as upward with the reflecting surface of the described reflecting part of below reflection, have the light that the light wave laterally or longitudinally of light projector can only be departed from all directions and carry out the retroreflecting band of function of reflecting.

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