Invention content
For the problems of the control program of above-mentioned existing sewing machine cloth-dragging wheel, it is an object of the present invention to carryFor a kind of reasonable design, simple in structure, easy to operate, the automatic control device of the high sewing machine cloth-dragging wheel of control accuracy.
The second object of the present invention is to provide a kind of the automatic of the sewing machine cloth-dragging wheel implemented based on above-mentioned control deviceControl method.
In order to achieve the above object, the present invention adopts the following technical scheme that：
For purpose 1：A kind of device for automatically controlling of sewing machine cloth-dragging wheel, the control device include：
One for controlling the cloth-dragging wheel pneumatic device that cloth-dragging wheel is lifted or fallen；
One for incude whether there is or not sew fabric photoelectric sensor；
One backstitches detection switch for backstitch detection；
One mechanical transmission mechanism for transmitting needle gage regulated quantity, the mechanical transmission mechanism are corresponded to according to needle gage regulated quantityChange the electrical parameter of cloth-dragging wheel stepper motor driver；
One control system, control system control connection cloth-dragging wheel pneumatic device, photoelectric sensor backstitch detection and openPass, cloth-dragging wheel stepper motor, machine spindle motor, cloth-dragging wheel stepper motor driver；The control system is according to light inductanceIt answers the detection signal of device to control cloth-dragging wheel pneumatic device driving cloth-dragging wheel to lift or fall, be believed according to the detection for backstitching detection switchNumber control cloth-dragging wheel stepper motor driving cloth-dragging wheel forward direction feeding or reversed feeding；The control system is according to cloth-dragging wheel stepping electricityThe electrical parameter of machine driver, amount of spin of the control cloth-dragging wheel stepper motor when sewing a needle gage, control machine spindle electricityThe variation synchronous with the feeding speed of cloth-dragging wheel stepper motor of the sewing velocity of machine.
In the preferred embodiment of above-mentioned device for automatically controlling, the cloth-dragging wheel pneumatic device includes cylinder and pneumaticUnit, the cylinder are drivingly connected cloth-dragging wheel, and the pneumatic unit controls cylinder and is controlled by control system.
Further, the photoelectric sensor is optoelectronic switch.
Further, the mechanical transmission mechanism is separately connected needle gage regulating mechanism and cloth-dragging wheel stepping electricity on sewing machineMachine driver so that each needle gage value corresponds to an electrical parameter on cloth-dragging wheel stepper motor driver respectively.
Further, the needle gage regulating mechanism is needle gage dial plate.
For purpose 2：A kind of control method for fully automatic of sewing machine cloth-dragging wheel, the control method turn needle gage regulated quantityThe electrical parameter for turning to cloth-dragging wheel stepper motor driver is turned to control cloth-dragging wheel stepper motor when sewing a needle gage with thisMomentum so that the feeding speed of cloth-dragging wheel stepper motor variation synchronous with the sewing velocity of machine spindle motor；The controlMethod based on sewing whether there is or not detection signal control cloth-dragging wheel be execute lift or fall, while based on backstitch detection signal controlThe feeding of cloth-dragging wheel forward direction executes reversed feeding.
In the preferred embodiment of above-mentioned control method for fully automatic, which includes the following steps：
(1) after the power is turned on, if cloth photoelectric sensor does not perceive sewing fabric, control system control cylinder will dragCotton piece buff is lifted；If cloth photoelectric sensor perceives sewing fabric, control system sends out instruction, by pneumatic unit, drives gasCloth-dragging wheel is fallen and pushes down feeding by cylinder；
(2) when needing to backstitch, detection switch is backstitched accordingly by triggering, control system is connected to this, and to backstitch signal instantControl the reversion of cloth-dragging wheel stepper motor so that feed mechanism and cloth-dragging wheel reversed feeding simultaneously；
(3) need change sewing needle away from when, by needle gage regulating mechanism adjust sewing needle away from, while control system synchronizeAmount of spin of the cloth-dragging wheel stepper motor when sewing a needle gage is adjusted, ensures the cloth feed amount and cloth-dragging wheel cloth feed amount of feed mechanismUnanimously；
(4) after sewing, sewing pedal is stepped on, control system execution is lifted presser feet and cloth-dragging wheel lift action, takenGo out sewing, sewing terminates.
Further, in the step (3) adjust sewing needle away from when, by mechanical transmission mechanism according to needle gage regulated quantity pairShould change the electrical parameter of cloth-dragging wheel stepper motor driver, control system according to the electrical parameter of cloth-dragging wheel stepper motor driver,Amount of spin of the cloth-dragging wheel stepper motor when sewing a needle gage is controlled, the sewing velocity and mop of machine spindle motor are controlledThe feeding speed for taking turns stepper motor synchronizes variation.
Scenario-frame provided by the invention is simple, easy to operate, can realize cloth-dragging wheel and Sewing machines needle pitch modulating mechanism,It backstitches action and sewing velocity three synchronizes, effectively realize the Automatic Control of sewing machine cloth-dragging wheel, to ensure sewing quality,Improve working efficiency, mitigate the labor intensity of operator, reduce sewing cost, to make labourer's operation freely, it is handy.
Specific implementation mode
In order to make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand, tie belowConjunction is specifically illustrating, and the present invention is further explained.
The present invention is by controlling sewing machine cloth-dragging wheel and Sewing machines needle pitch modulating mechanism, backstitching action and sewing velocity threeIt is adjusted in synchronism, is achieved in the full-automation of sewing machine cloth-dragging wheel control.
For this purpose, scheme of the present invention includes mainly following two aspect：
1, sewing machine cloth-dragging wheel is adjusted in synchronism by step motor control feeding amount, and with needle gage regulating mechanism, specifically, firstFirst pass through the internal processes compiling to stepper motor driver so that each needle gage value corresponds to a cloth-dragging wheel stepper motor and drivesThe electrical parameter of dynamic device；As a result, needle gage regulating mechanism metering needle away from when, it is same according to needle gage regulated quantity by corresponding mechanical mechanismThe electrical parameter of step modification cloth-dragging wheel stepper motor driver；Furthermore the control system of sewing machine is by the driver after synchronous vacationsElectrical parameter is converted into the corresponding pulse number i.e. step angle of stepper motor, and is being sewed with this to control cloth-dragging wheel stepper motorThe amount of spin of (machine spindle motor turns around) when one needle gage then realizes the sewing speed of control machine spindle motorDegree variation synchronous with the feeding speed of cloth-dragging wheel stepper motor (ensures the cloth feed amount and cloth-dragging wheel cloth feed amount one of feed mechanismIt causes).
2, control front end increase sewing whether there is or not detection function, with control cloth-dragging wheel be execute lift or fall it is dynamicMake；Increase in sewing is whole and backstitch detection function, is to execute positive feeding or execute reversed feeding to control cloth-dragging wheel.
Referring to Fig. 1 to Fig. 3 which shows be provided with the seam of sewing machine cloth-dragging wheel device for automatically controlling provided by the inventionIt threads machine structure.
As shown in Figure 1, the sewing machine includes mainly sewing unit 1, (the hereinafter referred to as control system of microcomputer control system 2System), pneumatic unit 3, sewing unit platen and holder 4.
As shown in Figures 2 and 3, for the setting of sewing unit 1 on sewing unit platen, which includes mainly main shaft electricityMachine 5 backstitches detection switch 6, mop wheel-drive 7, needle gage dial plate 9, backstitches switch 10, optoelectronic switch 11, backstitch spanner 12, dragCotton piece buff stepper motor 13, cloth-dragging wheel 15, cylinder 16.
Spindle motor 5 is used to drive the sewing work of entire sewing machine.
Mop wheel-drive 7, cloth-dragging wheel stepper motor 13 and the cooperation of cloth-dragging wheel 15 constitute cloth-dragging wheel feed mechanism, whereinCloth-dragging wheel 15 is arranged relative to the sewing needle of sewing machine, and cloth-dragging wheel stepper motor 13 drives cloth-dragging wheel by mop wheel drive shaft 1415 execute positive feeding or execute reversed feeding.Mop wheel-drive 7 connects with cloth-dragging wheel stepper motor 13, for controlling mopTake turns the stepping-in amount (i.e. amount of spin) of stepper motor 13.The internal processes of the mop wheel-drive 7 compile so that cloth-dragging wheel stepping electricityThe electrical parameter of machine driver corresponds to corresponding needle gage value, i.e. an adjustable needle gage value drives corresponding to cloth-dragging wheel stepper motorOne electrical parameter of device.
Pneumatic unit 3 is connect with cylinder 16 cooperatively forms the driving mechanism that control cloth-dragging wheel execution is lifted or fallen, whereinCylinder 16 is drivingly connected cloth-dragging wheel 15, and the setting of pneumatic unit 3 controls connection cylinder 16 on sewing unit rack.
Needle gage regulating mechanism of the needle gage dial plate 9 as entire sewing machine, each needle gage value thereon correspond to cloth-dragging wheelAn electrical parameter on stepper motor driver 7, specifically, the needle gage dial plate 9 is connected to cloth-dragging wheel by mechanical transmission mechanism 8Motor driver 7, the mechanical transmission mechanism 8 needle gage dial plate 9 metering needle away from when, needle gage regulated quantity is synchronously transmitted to mopTurbin generator driver 7 so that mop wheel-drive is according to the correspondence of electrical parameter and needle gage value, the corresponding electricity ginseng of synchronous adjustment(each needle gage value i.e. on needle gage dial plate is able to determine the electricity of a mop wheel-drive by mechanical transmission mechanism numberParameter, that is, the feeding amount of cloth-dragging wheel when one needle gage of corresponding sewing is determined).
It backstitches and switch 10 and backstitches spanner 12, backstitch action for control sewing machine, backstitch detection switch 6 relative toSeam switch 10 backstitches switch 10 and backstitches the mode of operation of spanner 12, sewed with detecting with the setting of spanner 12, real-time monitoring is backstitchedWhether machine is backstitched, and detects signal accordingly.
Optoelectronic switch 11 is arranged in the front end of sewing machine, for detecting the presence of sewing in real time, and forms corresponding detectionSignal.
Control system 2 is the control centre of entire sewing machine, is arranged in the lower section of sewing unit platen, and the company of controlIt connects pneumatic unit 3, spindle motor 5, backstitch detection switch 6, mop wheel-drive 7, optoelectronic switch 11, cloth-dragging wheel stepper motor13.It controls pneumatic unit 3 according to the detection signal of optoelectronic switch 11 and cloth-dragging wheel 15 is driven to lift or fall, and is detected according to backstitchingThe detection signal control cloth-dragging wheel stepper motor 13 of switch 6 drives the positive feeding of cloth-dragging wheel 15 or reversed feeding；Basis is dragged simultaneouslyThe electrical parameter of cotton piece buff stepper motor driver 7, amount of spin of the control cloth-dragging wheel stepper motor 13 when sewing a needle gage, with controlThe variation synchronous with the feeding speed of cloth-dragging wheel stepper motor 13 of the sewing velocity of machine for sewing spindle motor 5.
Thus the full-automatic sewing machine constituted, after being powered up, the Automatic Control of sewing machine cloth-dragging wheel startWork, is first lifted cloth-dragging wheel 15 by cylinder 16；When optoelectronic switch 11 has perceived sewing, control system 2 sends out instruction,It drives cylinder 16 to act by pneumatic unit 3, cloth-dragging wheel 15 is fallen and pushes down feeding.Start to sew, control system 2 is according to mopThe electrical parameter of wheel-drive 7, amount of spin of the control mop turbin generator 13 when sewing a needle gage, and control spindle motor 5Sewing velocity variation synchronous with the feeding speed of mop turbin generator 13.
It when needing to backstitch, presses when backstitching switch 10 or backstitching spanner 12, triggering is backstitched into detection switch 6, control systemSystem 2 be connected to this backstitch signal control immediately mop turbin generator 13 reversion, mop turbin generator 13 pass through mop wheel drive shaft 14 drive15 reversed feeding of cloth-dragging wheel then ensures feed mechanism and cloth-dragging wheel reversed feeding simultaneously.
When need to change in sewing sewing needle away from when, by adjusting needle gage dial plate 9, change sewing needle away from while needle gage tableThe electrical parameter of 8 synchronous adjustment mop wheel-drive 7 of mechanical transmission mechanism on disk, control system 2 will join according to the electricity after adjustmentAmount of spin of the number adjustment mop turbin generator when sewing a needle gage, ensures the cloth feed amount and cloth-dragging wheel cloth feed amount one of feed mechanismIt causes.
When operator is after sewing, steps on cloth-dragging wheel while sewing pedal lifts presser feet while lifting, take out seamMaterial, sewing terminate.Due to not having sewing, optoelectronic switch not to trigger, cloth-dragging wheel lifts always, until there is sewing by optoelectronic switchPerception is just fallen.
Carry out further instruction this programme below by way of a concrete application example：
The full-automatic sewing machine that this example is constituted based on said program is completed whole by the control mode of a closed-loop controlThe Automatic Control of a sewing process cloth-dragging wheel, detailed process are following (referring to Fig. 4)：
(1) after sewing machine powers on, control system detection cloth-dragging wheel control is still automatically controls manually, if handIt is dynamic, then it forces to lift cloth-dragging wheel；If automatically controlling, then step (2) is transferred to.
(2) whether control system detection sewing machine starts to sew, if not having, controls cylinder driving by pneumatic unit and dragsCotton piece buff is lifted；If starting to sew, it is transferred to step (3).
(3) control system has detected whether sewing by the optoelectronic switch of front end, if nothing, gas is controlled by pneumatic unitCylinder driving cloth-dragging wheel lifts；If so, being then transferred to step (4).
(4) whether the presser feet of control system detection sewing machine lifts, and is dragged if so, then controlling cylinder driving by pneumatic unitCotton piece buff is lifted；Cloth-dragging wheel is driven to fall if no, controlling cylinder by pneumatic unit.
(5) if detection needle gage does not change, needle gage regulating mechanism maintains the original state with mop wheel-drive, sewing machineThe feeding amount of feed mechanism is consistent with the feeding amount of cloth-dragging wheel；If detection needle gage changes, needle gage regulating mechanism (such as needle gage tableDisk) variation will drive the electrical parameter of positively related mechanical transmission mechanism synchronous change mop wheel-drive therewith, to changeAmount of spin of the control system to mop turbin generator when spindle motor rotation is turned around, keeps the feeding with the feed mechanism of sewing machineAmount is consistent.
(6) control system controls the sewing velocity and mop turbin generator of spindle motor according to the electrical parameter of mop wheel-driveFeeding speed synchronize variation.
(7) if backstitching mechanism, it is transferred to step (8)；If backstitching mechanism has action, it is transferred to step (9).
(8) sewing machine normally sews, sewing machine feeding mechanism (such as feed dog) forward direction feeding, cloth-dragging wheel forward direction feeding.
(9) control system detects that backstitching mechanism has action by backstitching detection switch, (is such as sent in sewing machine feeding mechanismDog) reversed feeding when, the reversed feeding of synchronous control cloth-dragging wheel.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industryPersonnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe thisThe principle of invention, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these changesChange and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and itsEquivalent defines.