CN201144334Y - Front and back automatic thread cutting device for overedger sewing products - Google Patents

Abstract

The utility model discloses an automatic shear line device for shearing the front and the back of a sewing product manufactured by an overedger. The device consists of a transmission-mode synchronous scanning photoelectric group, a blowing device, a start signal inductor, a front cut dust collecting device, a stepping sensor, an electromagnetic or pneumatic shear tool holder (an actuator), and an electric control box. The front and the back knives of the sewing product are both provided with one automatic shear line device controlled by photoelectric detection. Under the premise of no human intervention, the shearing process that line hairs on the front end and the back end of the sewing product can be set at random is finished. As lines are sheared without stopping the machine, and meanwhile, line heads after being sheared are cleanly drained off. And as lines are sheared without stopping the machine, meanwhile, line heads after being sheared are cleanly drained off, the working efficiency of a single machine is increased by more than 30 percentage when comparing with that of the prior art, and the automatic shear line device has high efficiency and strong reliability.

Description

Front and rear automatic shear line device of overedger sewing products

Technical field

The utility model relates to the sewing device field, relates in particular to a kind of overlock machine that is used for sewings is carried out the automatics that sewing line is sheared in front and back.

Background technology

At present, all types of overlock machines do not have automatic shear line device, and trimming becomes one loaded down with trivial details operation of clothing factory, because the requirement of production technology, producing the over-lock seam length that different product need stay is to need control, or joins the trimming workman, or makes workman oneself with the scissors trimming afterwards that stops; Labour's expense height, inefficiency; Each factory constantly increases new equipment in order just to raise the efficiency, and improves production capacity; These behaves increase the manufacturing cost of factory undoubtedly.

In order to address these problems, some cutting facilities have also been increased, with stop the back manually Push switch estimate and finish sewings afterbody shear line, such method, though can trimming, but want the artificial visually examine to judge that clipped position comes execution after need stopping, efficient is not high and just shear the end of a thread of sewings afterbody.

Utilize the locomotive rotational travel to determine that the position of sewings finishes the trimming process, owing to adopt the outer direct reflection electric eye of presser feet, owing to make the operation that the worker does not have standard, cause the accurately original position of location slit goods easily, can regularly cut into waste product to sewings, this technology can't be sheared the line hair of sewings front end equally, the cost costliness of this device of while, and general factory can't acquire.

Adopt link gear, existing equipment is installed is not easy, parts are many, continuously to seize up, also have lubricant contamination, influence product quality, can't accurately shear sewings line hair front end and rear end, are unfavorable for widespread usage.

Because overlock machine needs the space of trimming narrow and small, therefore present existing technique device does not also have thoroughly to resolve factory and need finish high efficiency, low-cost again reliably before and after the demand of shear line.

Summary of the invention

The utility model is the shortcoming that exists at prior art, provide a kind of overlock machine that can be used for to adopt transmission-type synchronous scanning photoelectricity group to be used for detection and location sewings position, carry out the front and rear automatic shear line device of overedger sewing products of cut-to-length sewing line in the situation of not stopping.

The utility model is realized by the following technical solutions:

By transmission-type synchronous scanning photoelectricity group, blowing device, enabling signal inductor, the preceding dust collect plant of cutting, the stepping sensor, electromagnetism or pneumatic clipper cutoff knife rack (executing agency), electric control box are formed.

Transmission-type synchronous scanning photoelectricity group is made up of 2 above transmitters and 2 above receivers, and being installed in the baffle plate base plate of shearing on the knife rest is transmitter, and it is characterized in that: first transmission photoelectricity group is preceding shearing test point; Reception photoelectricity forms the reception of certain angle cone-shaped with the closed light path of emission photoelectricity correlation, and is tangent with sewings formation certain angle; When sewings interdicted the closed-loop path of first transmission photoelectricity group, this was the signal of preceding shearing, and executing agency's work is gone to trigger in the forward position of signal.The relative correlation of transmission mode of the 2nd photoelectricity group, when sewings interdicted the closed-loop path of the 2nd transmission photoelectricity group, this was the initialize signal of back shear action, executing agency's work is gone to trigger in the back edge of signal.

Adopt synchronous scanning light, can avoid the signal between adjacent photoelectricity to disturb.

Between the 1st transmission photoelectricity group and the 2nd the transmission photoelectricity group is the shear knife clipped position.

The 2nd transmission photoelectricity group, back can increase the photoelectricity group and reduce by the 1st, the 2nd transmission photoelectricity group and the big sewings of light transmittance is reduced light leak or have mixed and disorderly line hair to block the probability of the shielding signals that the 2nd photoelectricity produces.

Transmission-type synchronous scanning photoelectricity group is linked by two multicore shielding holding wires and electric control box.

Priming inductor is installed on the axle sleeve of operation clutch motor outside its feature: its clutch motor moving runner is stepped on by pedal driven the clutch motor connection lever, formation clutch motor clutch state and respond to the generation start signal.One step on and prepare the judgement that starts the machine behind the pedal making the worker, and feed signals is to electric control box, and the circuit state of whole device is carried out initialization, and the two starts blowing device.Enabling signal inductor and electric control box link

Blowing device, main body is installed in overlock machine casing back, blower was had mercy on above the transmission-type attitude scanning photoelectricity group of receivers, the blowing head is around meeting the pin front, below the 1st receiver of transmission-type attitude scanning photoelectricity group, the enabling signal inductor sends enabling signal, sends the instruction blowing device facing to the sewing line blowing by control system, smooth out with the fingers straight sewing line Mao Weiqian shear action and prepare, the blowing device electric control box links.

Blowing device mainly is the work when being used in preceding the shearing, when the enabling signal inductor sends enabling signal, send the instruction blowing device facing to the sewing line blowing by control system, smooth out with the fingers straight sewing line hair, the clutch motor rotates sewings to begin to make, when sewings arrives the closed light path of first transmission photoelectricity group, when closed light path is interdicted by sewings, after preceding shear action was finished, the blower fan of blowing device quit work.

Blowing device is sending enabling signal when the enabling signal inductor, sends the instruction blowing device facing to the sewing line blowing by control system, smoothes out with the fingers straight sewing line hair; Because priming inductor has a process that detects stroke at induction clutch motor moving runner, can first output signal, after make just that clutch is closed to drive that motor rotates and the beginning sewing work.

Before cut dust collect plant, form by air-suction duct, dust arrester, air-flow transform controller, the inlet scoop is installed in the emission of transmission-type synchronous scanning photoelectricity group and organizes between the 1st launch point and the 2nd launch point, place, the air channel of base plate cover plate; Its feature: after the host power supply start, the dust arrester jogging speed is rotated, when the enabling signal inductor sends enabling signal, send instruction by control system, air suction device rotates at full speed, and the sewing line fleece is inhaled straight simultaneously, when sewings interdicts the 1st transmission photoelectricity group, shear knife is sheared the hair that goes offline, the unnecessary line hair of shearing before air suction device sops up, the cleaning of maintenance working environment; Shear knife is sheared back dust arrester jogging speed and is rotated, air-flow transform controller work simultaneously, and the air-suction duct air quantity reduces; Be unlikely to elongate the end of a thread that the sewings front end is reserved; Finish these actions and enter the next periodic duty cycle.Before cut dust collect plant and electric control box links.

The stepping sensor is installed on the overlock machine casing, to mechanical linkage detection hunting period of locomotive operation, makes a pin because motor rotates a circle for overlock machine, and mechanical linkage is swung once simultaneously; This signal leaves the 2nd transmission photoelectricity group as sewings and begins to count the pin number, and the accumulative total of pin number is exactly the end of a thread length that sewing line is reserved in the sewings back, cuts scissors when these data with electric control box driving after pre-set data equate and begins to move; Stepping sensor and electric control box link.

Electromagnetism or pneumatic clipper cutoff knife rack are the devices that shear knife is installed, and also are simultaneously the winding of transmission-type attitude scanning photoelectricity to be installed organized; Directly fixing with overlock machine.

Electric control box is whole device core control system, to transmission-type attitude scanning photoelectricity group, enabling signal inductor, stepping sensor, and signal acquisition process, simultaneously, drive blowing device, preceding dust collect plant, electromagnetism or the pneumatic clipper cutting knife cut.And provide power supply power supply for the electrical equipment that is associated.

Adopt the stepping sensor that the mechanical linkage of locomotive operation is calculated sewings hunting period and meet pin pin number, determine the length that sewings moves, when after cut the position detected after, count and to reserve the end of a thread length of sewing line, the automatics of accurately shearing to configuring the sewings back arbitrarily.

Meet pin back narrow space owing to adopt transmission photoelectricity group can be installed in overlock machine, accurately location slit goods front end puts in place.

Blowing device is smoothed out with the fingers straight sewing line hair, and disorderly line hair does not disturb the detection of front end photometer head; Make the reliable and stable work of whole device.

To the line hair of preceding shearing sewings front end, by air intake device, suck in the dust bucket, keep the cleaning of working environment.

Shear before device does not need manual intervention to finish and the back shear action, the work of making can not stopped and be carried out continuously, also can be because of not making worker's operating influence device error work lack of standardization.Whole process belongs to automatic judgement and finishes shearing, does not also have the machinery contact and surveys, and belongs to the non-contact detecting sewings;

The beneficial effects of the utility model are that cutter all has a kind of full-automatic shear line device of Photoelectric Detection control before and after the sewings, under the prerequisite of no any human intervention, finishes the shear history that sewings front end of line hair and sewings rear end can be set the line hair arbitrarily.Because the dispense with parking trimming blots the end of a thread under the clean shearing simultaneously, so the operating efficiency of unit improves more than 30% efficient height, reliability height than prior art.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a device distribution generalized schematic of the present utility model;

Fig. 2 is the utility model system block diagram;

Fig. 3 is the utility model synchronous scanning photoelectricity group schematic diagram;

Fig. 4 is the utility model electromagnetism or pneumatic clipper cutoff knife rack schematic diagram;

Fig. 5 is the utility model transmission-type synchronous scanning photoelectricity group emission group;

Fig. 6 is the utility model transmission-type synchronous scanning photoelectricity group of received group;

Fig. 7 is the utility model priming inductor;

Fig. 8 is the utility model blowing device schematic diagram;

Fig. 9 is the utility model dust collect plant;

Figure 10 is the utility model air-flow transform controller;

Figure 11 is the utility model electric control box panel schematic diagram;

Figure 12 is the utility model transmission-type synchronous scanning photoelectricity group;

Figure 13 is the utility model drive circuit figure;

Figure 14 is the utility model power circuit diagram;

Figure 15 is the utility model main control circuit;

Figure 16 is the utility model dust arrester circuit;

Figure 17 is the utility model air-flow transform controller circuit;

Figure 18 is another embodiment drive circuit of the utility model figure.

The number in the figure explanation

Cut dust collect plant before the 1-transmission-type synchronous scanning photoelectricity group 2-priming inductor 3-blowing device 4-

5-stepping sensor 6-electromagnetism or pneumatic clipper cutoff knife rack 7-electric control box 8-pedal

9-pedal connecting rod 10-moving runner 11-clutch motor

The installing hole of the sensitive surface C2-priming inductor of A1-synchronous scanning photoelectricity group emission group A2-priming inductor

The 3rd group of photoelectricity indication of the 2nd group of photoelectricity indication of the 1st group of photoelectricity indication of 71-72-73-

Shear before the 74-priming inductor signal 75-power supply indication 76-and switch

The 79-change-over switch is switched in shearing before shearing switching 78-before and after the 77-

The plug of the plug 82-photoelectricity reception group of 80-power switch 81-photoemission group

83-priming inductor plug 84-blowing motor plug 85-shear knife drives plug

86-attaching plug 87-bidirectional electromagnet is cut dust collect plant motor plug before driving plug 88-

The 89-fuse

The specific embodiment

Below in conjunction with specific embodiment, further specify the utility model and how to realize.

Embodiment

As Fig. 1, Fig. 3, shown in Fig. 4, transmission-type synchronous scanning photoelectricity group 1 is made up of two above transmitters and two above receivers, for being installed on electromagnetism or the pneumatic clipper cutoff knife rack 6, synchronous scanning photoelectricity group emission group 1A is contained in and meets pin Z and presser feet Y the place ahead, sewings F is parallel to be moved above it, first receiver 1ar of synchronous scanning photoelectricity group emission group 1A first transmitting illuminant 1ae and synchronous scanning photoelectricity group of received group 1B is correlation up and down, first receiver 1br forms the closed light path of reception of the angle of taper J that is not more than 90 degree all around on the axis 1Z of first transmitting illuminant 1ae, it is tangent that sewings F and first transmitting illuminant 1ae and first receiver 1ar form closed light path angulation.Between synchronous scanning photoelectricity group emission group 1A and the synchronous scanning photoelectricity group of received group 1B mounting distance 3-40mm.Shear knife D position moves forward and backward installation in the band of position of the main shaft 2Z that meets pin Z and sewings F approach axis, and between first transmitting illuminant 1ae and second transmitting illuminant 1be; Second transmitting illuminant 1be and second relative up and down correlation of receiver 1br, the 3rd transmitting illuminant 1ce and the 3rd receiver 1c) relative up and down correlation.

As shown in Figure 10, Figure 11, Figure 13, R1, C1,40106 (U1A) form square-wave oscillator, import 10 system counters 4017 (U2), Q1, Q3, Q5 pulse output square wave of being separated by successively, a corresponding input four and door 4081,1,5,8 pin, 40106 (U1A) process, after U1B is anti-phase, input four and door 4081,2,6,9 pin; 3,4,10 pin are exported modulating pulse in proper order, and 4017 (U2) Q5 and Q15 link, when Q5 does not export high level.Q15 is a low level, 4017 (U2) output is exported successively, when Q5 output high level, 4017 (U2) are reset, again order output level successively, form a scan period like this, sweep signal is amplified through triode Q1, Q2, Q3, promotes dynamic scan photoelectricity group emission group 1A by plug 82, and E1 is first transmitting illuminant 1ae, E2 is second transmitting illuminant 1be, and E3 is the 3rd transmitting illuminant 1ce; R6 is a current-limiting resistance, regulates this resistance and can change dynamic scan photoelectricity group emission group 1A luminous intensity.Be used for controlling to the optical attenuation after effective detection of the sewings of unlike material and the compensation long-term work.Dynamic scan photoelectricity group emission group signal shielding line is connected with positive source.The three terminal regulator 7812 of Figure 11 provides the voltage of circuit 12VDC.

Dynamic scan photoelectricity group of received group inserts photoelectricity by plug-in unit 81 and receives amplifying circuit, and D2 is first receiver 1ar, and D3 is second receiver 1br, and D4 is the 3rd receiver 1cr;

D2 receives the emission light of E1, through magnetic bead CZ1 and biasing resistor R) formation received current loop, through capacitor C 4 couplings, by the amplifying circuit that triode Q4 forms, jump pulse is born in anti-phase amplification, and capacitor C 5 is formed differential circuit with resistance R 10, when triode Q4 no signal, triode Q5 base stage is a high level, the Q5 conducting, and the Q5 current collection is low level very.D5 does not have Continuity signal, when triode Q4 colelctor electrode has negative jump pulse signal, triode Q5 base stage is a low level, not conducting of Q5 and since the colelctor electrode of Q5 be connected on four with 3 pin of door 4081 on, have periodic high level to make the D5 conducting by R11, signal that D2 receives and the signal on the Q5 colelctor electrode are synchronous, if nonsynchronous signal is arranged, can make the Q5 conducting, the Q5 current collection is low level very.R13 and C7 are integrating circuit, and the signal of D5 is carried out producing the integration ripple behind the integration, deliver to 4069 U5A through R14 and carry out shaping with this schmitt trigger that U5B forms, and R15 is a feedback resistance, controls the shaping degree of depth.U5B output high level B lights LED1 (71), U5A output low level A.

As above-mentioned principle, the received signal of D3 makes U5D output high level D, LED2 (72) is lighted, U5C output low level C.

As above-mentioned principle, the received signal of D4 makes U5F output high level, LED3 (73) is lighted, U5E output low level E.

C6, C14, C21 are the anti-interference capacitor of receiving circuit, and its parameter is 0.1uF.

When D2 by shading, U5B output low level B extinguishes LED1, U5A output high level A.

When D3 by shading, U5D output low level D extinguishes LED2, U5C output high level C.

When D4 by shading, the U5F output low level is extinguished LED3, U5E output high level E.

As Fig. 1, Fig. 5, Figure 10, shown in Figure 13, the pedal 8 of overlock machine is stepped on drivening rod 9, drive clutch motor moving runner 10 then, clutch motor 11 is rotated, the installing hole 2C of priming inductor is installed on the clutch motor 11 brake set screws, priming inductor 2 is an inductance type transducer, its sensitive surface 2A induces eddy current and changes into the signal of telecommunication clutch motor moving runner 10 metal covering clutch states, when moving runner 10 during near priming inductor 2, it exports high level, and the signal of output is sent into the GIN end; Socket 83 by plug cord electric control box 7 connects; Input signal GIN.2B is regulated in sensitivity can regulate sensitive surface 2A to the distance that clutch motor moving runner 10 metal coverings detect, and is moving runner 10 or itself and clutch different gap at different materials, the assurance of effective reliable detection.

As Figure 10, shown in Figure 13, function switch 79 is the band switch S1 and the S2 of duplex three cuttves, cuts 76 position S1 before function switch 79 switches on S1a; After switching in, cuts function switch 79 78 position S1 on S1c; Function switch 79 switches in full-automatic 77 position S1 on S1b; The S2 closure.

As Figure 13, shown in Figure 14, Si Mite and NAND gate U4 form a monostable circuit that drives electromagnetism or pneumatic clipper cutting knife L1, L2, voltage U I is by the D9 halfwave rectifier, after the C33 filtering, provide electric current to make it conducting by R49 to optocoupler P521, behind power-off, not conducting of optocoupler, play preventing that powered-down false triggering VT1 from causing electromagnetism or pneumatic clipper cutting knife L1, L2 carries out action.When IN1 did not have the input triggering signal, U4A held high level, the 3rd pin output low level, and U4B exports high level, the VT1 no-output, L1, L2 do not carry out action.U4D the 13rd pin is a high level, and the 12nd pin also is a high level, and U4C the 10th pin is a high level, and low level is kept in U4A output.When IN1 input low level triggering signal, triggering signal enters U4D by C23, the U4C output is an electronegative potential, and R41, R42, C24 form an integrating circuit, by the U4A signal broadened after, become low level by the anti-phase U4D of making the 13rd pin of U4B simultaneously, close the triggering signal of IN1, the signal behind the broadening makes the VT1 conducting by optocoupler P521, VT1 drives L1, L2 work, electromagnetism or pneumatic clipper cutting knife work scissor tangent line.As R41, R42, C24 after the time of integration, VT1 resets by electromagnetism or pneumatic clipper cutting knife, wait for next action triggers signal, triode Q13 and C26, R39, R53 form the anti-error circuits for triggering of start time-delay, guarantee not make electromagnetism or the misoperation of pneumatic clipper cutting knife after the start.The groundwork time that the parameter of R41, R42, an integrating circuit of C24 composition will satisfy electromagnetism or pneumatic clipper cutting knife.

As Fig. 3, Figure 12, Figure 13, shown in Figure 14, A, B are the low level and the high level signals of transmission-type synchronous scanning photoelectricity group emission group 1 and the closed light path of the 1st photoelectricity of transmission-type synchronous scanning photoelectricity group of received group 2; C, D are the low level and the high level signals of transmission-type synchronous scanning photoelectricity group 1 and the closed light path of the 2nd photoelectricity of transmission-type synchronous scanning photoelectricity group 2; E is a low level signal of penetrating formula synchronous scanning photoelectricity group 1 and the closed light path of the 3rd photoelectricity of transmission-type synchronous scanning photoelectricity group 2.

When dipped goods enters transmission-type synchronous scanning photoelectricity group, A, C, E are low level, and B, D are high level, and d type flip flop U7 forms the split circuit of a signal triggering.U7B is shear signal before triggering, and U7A is for triggering the back shear signal; During start, the reset terminal R of U7B is resetted by the start reset circuit that R56, C36 form, and the A end is low level signal, and the D termination high level of U7B, S connect negative pole, according to the operation principle of d type flip flop, and U7B the 1st pin output low level, the 2nd pin output high level; C35, R51 are differential circuit, in conjunction with U8A, U8B phase inverter, form a signal leading edge and trigger, since U7B the 1st pin output low level, also Triggerless output of S1-2.

The reset terminal R of U7A is a high level owing to D, and R also is a high level, the D termination high level of U7A, and S connects negative pole, U7A the 13rd pin output low level; C34, R50 are differential circuit, in conjunction with the U8C phase inverter, form a signal trailing edge and trigger, since U7A the 1st pin output low level, also Triggerless output of S1-1.

With the motor-driven signal controlling gate circuit of a blowing device of door U6B composition, U6B the 2nd pin is the high level of U7B the 2nd pin, and U6B the 1st pin has individual pull-up resistor, when the S2 disconnection, its input is a high level, after the operative employee steps on pedal, make moving runner near priming inductor, it exports high level, and the GIN end is high level, the 8th pin of U6B also is a high level, the 9th pin output high level of U6B is lighted enabling signal lamp LED4, passes through R72, make the VT2 conducting, drive the motor M work of blowing device.

With door U6A be the gate circuit that triggering signal is sheared in the back, its principle, when dipped goods enters transmission-type synchronous scanning photoelectricity group, E, C are low levels, the 6th pin of U6A is a low level also, U7A is not triggered.It is characterized in that of this circuit can work as transmission-type synchronous scanning photoelectricity group emission group 1 and the closed light path of the 1st photoelectricity of transmission-type synchronous scanning photoelectricity group of received group 2 by shading after, the B upset is low level, and the 6th pin of U6A is exported or low level, if 2nd, the 3rd group has the error signal upset to enter, U6A is closed, and this process is finished shear signal after the finger lock preceding shear signal.Can reliably prevent the back shear signal because the mistake roll setting phenomenon that photoelectricity causes the sewings light leak.

Then analyze, the operation principle of preceding shear action, after the operative employee steps on pedal, priming inductor work, the blowing motor rotates, the sewings transmission-type synchronous scanning photoelectricity group of entering, after the 1st closed light path interdicted, A point low level signal was turned into high level, the D end of U7B is high level, the R end is low level, and d type flip flop the 13rd pin is imported positive jump pulse, and the upset of the 1st pin is high level, pass through C35, R51 differential circuit and U8A, U8B shaping rising edge signal triggers, via S1, the S1-2 switch is delivered to back level monostable drive circuit, drives the work of electromagnetism or pneumatic clipper cutting knife, finishes preceding shear history; The 2nd pin upset of U7B is low level, the U6B output low level, and the blowing motor stops operating, and blowing device quits work; Finishing the blowing smooth out with the fingers straight sewing line hair after, preceding shearing work is finished, and closes the process of blowing.

Back shearing scheme one

When sewings continues to enter transmission-type synchronous scanning photoelectricity group, after the 2nd closed light path interdicted, the C point was turned into high level by low level, and the B point keeps low level, and the E point also keeps low level, and the D point is a low level.

When sewings enters transmission-type synchronous scanning photoelectricity group, after the 3rd closed light path interdicted, the upset of E point was high level C point maintenance high level, B point maintenance low level, and the D point is a low level.

When the sewings afterbody leaves the 1st closed light path, the E point keeps high level, and C point keeps high level, and the B upset is a high level, and the D point is a low level.At this moment, U6A exports high level, and ground 11 pin of U7A are imported positive jump pulse, and D point low level links to each other with the R end of U7A, and the D end of U7A is high level, U7A the 13rd pin output high level.

When the sewings afterbody leaves the 2nd closed light path, the upset of D point is high level, U7A is reset, U7A the 13rd pin is a low level by the high level upset, by after R50, C34 differential circuit and the U8C shaping along signal triggering, deliver to back level monostable drive circuit via S1, S1-1 switch, drive the work of electromagnetism or pneumatic clipper cutting knife, shear history after finishing; D12, D13 form an OR circuit, and when S1 switched in S1-3, S2 was not closed, and preceding shearing combines output with the back shear signal, and this process is automatic front and back shearing conditions; When if S1 switches in S1-1, the S2 closure is the back shearing condition; When if S1 switches in S1-2, S2 is not closed, is preceding shearing condition.

Back shearing scheme two

As shown in figure 18, when after shear triggering signal output after, flip-flop number CA, CA begin the pulse of stepping sensor is counted, to preestablish number consistent as count value and setting key CB, shear signal after CA exports.It is characterized in that: the stepping sensor is installed on the overlock machine casing, to mechanical linkage detection hunting period of locomotive operation, makes a pin because motor rotates a circle for overlock machine, and mechanical linkage is swung once simultaneously; When this signal leaves the 2nd transmission photoelectricity group as sewings, the back begins to count the pin number after shearing triggering signal output, and the accumulative total of pin number is exactly the end of a thread length that sewing line is reserved in the sewings back, when these data equate with pre-set data, CA output back shear signal.

For back shearing scheme, remove the foregoing description scheme, following description scheme also should belong to protection scope of the present invention

One, changes the distance of the 1st of transmission-type synchronous scanning photoelectricity group and the 2nd photoelectricity group.

Two, increase the number that later photoelectricity group is sheared in the back.

Three, increase the 3rd above number of transmission-type synchronous scanning photoelectricity group, and then to appoint fixed one be back shear signal point.

Stable for the job order of the preceding shearing that guarantees system and back shear signal, two-way switch circuit U 9 is formed depositing and the system initialization circuit the back shear signal, it is characterized in that, after finishing behind the shear signal, U9 deposits back shear signal signal, and shear action before and after finishing waits following one-period, after priming inductor sends high level signal, the back is sheared U7B is resetted.This principle can guarantee to work as sewings in transmission-type synchronous scanning photoelectricity group, in the time of in the 1st light path, because shearing trigger before when the back shear signal is not finished is can not reset, after shear signal is finished after must waiting until, shear trigger reset before just making when arriving by enabling signal; Stop the mistake in the photoelectricity group of the sewings in the course of work and sheared phenomenon; When sewings in the photoelectricity group, the B point is a low level because the existence of U3D is restarted after stopping exactly, enabling signal can not be passed through U3D, shears trigger reset before removing to make U7B by U9, U8D again.Guarantee system stability.

Dipped goods in the photoelectricity group, the locomotive running, this moment, B point signal was a high level, the signal of priming inductor output is sheared trigger reset before removing to make U7B through C37, R57, U1F, U1E, U3D, U9, the time U7B the 2nd pin be high level, blowing device operation when shearing before driving, the system initialization operation is finished.

As Fig. 8, Figure 16, shown in Figure 15, IN3 is the enabling signal of blowing device, also is simultaneously the signal of cutting dust collect plant before the control, when locomotive is opened, electric control box operation, power supply electrifying, bistable circuit UD resets, low level output, U11A and R1B, C1A, R1A, D1C form a square-wave oscillator, regulate R1A and can change duty of ratio, signal is through D1B, R1C, the VT3 triggering and conducting drives control of dust motor (M3) and slowly rotates; After system initialization is finished, the IN3 input high level, trigger bistable circuit UD, output makes the complete conducting of VT3 by D1A, D1B, control of dust motor M 3 full speed degree rotate, and the control of dust motor is in dust bucket 4D, and the line burr is by suction head 4A, air-flow transform controller 4B, pipeline 4C sucks in the dust bucket 4D.Current shear action one is finished, and the pulse signal of S1-1 triggers the R end of bistable circuit UD, and output overturns again and is the square-wave oscillator conducting that is triggered again of low level, VT3, and control of dust motor M 3 enters slow rotation.Enter the readiness of next cycle.

As Fig. 9, shown in Figure 17, the effect of air-flow conversion equipment is after current shear action is finished, the air draught inertia the when motor that guarantees dust collect plant changes slow the rotation over to, in case when after shear action one finish; The movable valve 4B3 that ins succession of bidirectional electromagnet 4B2, air-flow conversion equipment movable valve 4B3 will open immediately, has shutter type structure and quiet valve 4B4 to form maximum sidewind 4B6 above, makes primary air 4B5 reduce maximum suction air volume; Purpose is after current shear action is finished, and makes primary air 4B5 not be in the state of big suction air volume, does not elongate the end of a thread that the sewings front end is reserved.

After powering on, system initialization begins, GIN is a high level, by U11D anti-phase after, through C2B, the R2E differential triggers and the U11E shaping, it is the VT5D conducting, drive bidirectional electromagnet 4B2 forward coil L3, the movable valve 4B3 that ins succession of bidirectional electromagnet 4B2 closes air door, and this moment, primary air 4B5 sucked dust collect plant by pipeline 4B1, after shear action one is finished, S1-1 imports trigger impulse, via U11B anti-phase after, by D2A, R1B, C2A, integration stretched pulse signal, make the VT4 conducting drive bidirectional electromagnet 4B2 reverse winding L4 by the U11C shaping, the movable valve 4B3 that ins succession of bidirectional electromagnet 4B2 opens air door, and sidewind 4B6 sucks through air door, suck dust collect plant through piping 4B1, primary air 4B5 air-flow reduces to the air quantity that suits the requirements immediately.

As shown in figure 15, be the power unit of system's complete machine.

As shown in figure 11, electric control box panel schematic diagram.

Claims (5)

1, front and rear automatic shear line device of overedger sewing products, comprise transmission-type synchronous scanning photoelectricity group, blowing device, enabling signal inductor, the preceding dust collect plant of cutting, the stepping sensor, electromagnetism or pneumatic clipper cutoff knife rack and electric control box, it is characterized in that: described transmission-type synchronous scanning photoelectricity group is made up of 2 above transmitters, receivers, be installed on electromagnetism or the pneumatic clipper cutoff knife rack, synchronous scanning photoelectricity group emission group is installed in meets pin and presser feet the place ahead.

2, front and rear automatic shear line device of overedger sewing products according to claim 1, it is characterized in that: described transmission-type synchronous scanning photoelectricity group is linked by two multicore shielding holding wires and electric control box, the enabling signal inductor is installed on the axle sleeve of operation clutch motor outside, and enabling signal inductor and electric control box link.

3, front and rear automatic shear line device of overedger sewing products according to claim 1 is characterized in that: described blowing device main body is installed in overlock machine casing back, and blowing device and electric control box link.

4, front and rear automatic shear line device of overedger sewing products according to claim 1, it is characterized in that: cut dust collect plant before described and form by air-suction duct, dust arrester, air-flow transform controller, the inlet scoop is installed in the emission of transmission-type synchronous scanning photoelectricity group and organizes between the 1st launch point and the 2nd launch point, place, the air channel of base plate cover plate.

5, front and rear automatic shear line device of overedger sewing products according to claim 1, it is characterized by: described stepping sensor, install on the overlock machine casing, mechanical linkage to locomotive operation detects hunting period, motor rotates a circle and makes a pin for overlock machine, and mechanical linkage swing simultaneously once; This signal leaves the 2nd transmission photoelectricity group as sewings and begins to count the pin number, and the accumulative total of pin number is exactly the end of a thread length that sewing line is reserved in the sewings back, and stepping sensor and electric control box link.

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