CN107601160B - A kind of automatic wire feeding device and diagnostic method of tape jam self-diagnostic function - Google Patents

Abstract

The invention discloses the automatic wire feeding devices and diagnostic method of a kind of tape jam self-diagnostic function, including automatic wire feeding device, warning device, control unit.Automatic wire feeding device includes pedestal, wire feeding guiding tube, spring, spring fixed cavity, gear, wire feed stepper motor, driven wheel, removable bottom plate, crossbeam, elongated bolt, reel；Wire feeding guiding tube is relatively fixed with spring, is fixed on base bottom by spring fixed cavity；Gear is located at stepper motor output shaft, and driven wheel and crossbeam are located on removable bottom plate, and gear and driven wheel are matched for clamping tightly Filamentous feed；Elongated bolt is contacted with crossbeam, rotates elongated bolt and bottom plate is horizontally slipped；Reel is fixed by the bracket in Chuck top；Warning device includes two microswitches and two combined aural and visual alarms, and microswitch detects silk and the plug wire situation of lacking respectively, and alarm is for corresponding failure of alarming；Control unit real-time circulation detects the state of two microswitches, starts corresponding alarm when breaking down.

Description

A kind of automatic wire feeding device and diagnostic method of tape jam self-diagnostic function

Technical field

The present invention relates to the automatic wire feeding devices and diagnostic method of a kind of tape jam self-diagnostic function, are applied to welding manufacture And in FDM (fused glass pellet) increasing material manufacturing, belong to intelligence manufacture field.

Background technique

Wire feed is a very important link in field of machining.In recent years, the appearance pole of automatic wire feeding device The earth promotes the development of manufacturing, and which, which overcomes that manual wire feed accuracy is poor, consistency is poor, wire feed is unstable, etc. asks Topic.It is widely used in fields such as welding manufacture, FDM (fusion sediment formula) increasing material manufacturings.Currently, automatic wire feeding device in the market Mechanism is more, but its principle is similar.It is substantially described as follows: being first pressed in filiform feed by the gear being connected to the motor In one narrow slot, motor rotation makes gear generate the Filamentous feed movement of frictional force drive；Equally, it is by adjusting the speed of motor The movement speed of adjustable Filamentous feed.But it in the actual production process, often will appear the failures such as plug wire and scarce silk, if not Discovery in time, it will influence the quality of production and efficiency, or even defect ware occur.

Notification number is that the utility model patent of CN 203830943U discloses a kind of welding wire end of a period warning device, using connecing Nearly switching characteristic will be adjusted to the state of detection wire reel welding wire close to switch, when welding wire uses the last layer, close to switch inspection When not detecting welding wire, equipment issues the alarm of not welding wire.The device is only to sentence although can be realized scarce silk automatic alarm It is broken a supply disk and lacks silk alarm, lack silk failure, fault diagnosis function caused by automatic wire feeding device can not be set due to fracture of wire It can be single.

Publication No. be the patent of invention of CN 104140009A disclose a kind of automatic detection tin silk obstruction or fracture of wire from Dynamic warning device, the device drive rotary encoder wheel to rotate using the movement of tin silk, detect input motor arteries and veins by microprocessor The difference for rushing number and the received umber of pulse of rotary encoder carries out obstruction or fracture of wire detection, and provides warning message.The device although It can be realized plug wire and fracture of wire auto-alarm function, but which kind of failure cannot be specifically diagnosed to be is, and fault diagnosis standard is not It is clear, in addition use two rotary encoders, higher cost.

Therefore, how to provide that a kind of structure is simple, manufacturing cost is low, performance is stable, fault diagnosis functions are comprehensively automatic The problem of changing wire feeder, being those skilled in the art's urgent need to resolve.

Summary of the invention

To solve the problems in above-mentioned background technique, present invention employs following technical solutions:

A kind of automatic wire feeding device of tape jam self-diagnostic function, comprising: automatic wire feeding device, warning device, control are single Member.

The automatic wire feeding device includes pedestal, wire feeding guiding tube, spring, spring fixed cavity, gear, wire feed stepping electricity Machine, driven wheel, removable bottom plate, crossbeam, elongated bolt, the first auxiliary wheel, the second auxiliary wheel, bracket and reel.

Further, the wire feeding guiding tube is that a upper end is thin, hollow body of the thick formula in lower end, and the spring pocket is in wire feed Conduit middle-end, the two is relatively fixed, and the spring is installed in spring fixed cavity, and the spring fixed cavity is installed on pedestal Bottom.The wire feed stepper motor is mounted on the pedestal rear end, and the gear is mounted on the output shaft of wire feed stepper motor, Positioned at pedestal front end.The driven wheel, crossbeam are respectively arranged in removable bottom plate left end, right end, and the removable bottom plate can Horizontal sliding is done relative to the pedestal；The elongated bolt passes through screw hole on the right side of pedestal and mutually contacts with crossbeam, rotates elongated spiral shell Bolt can control that removable bottom plate is left and right to be moved horizontally, and then grip Filamentous feed between driven wheel and gear.Wire feed step Rotation into motor can make to generate frictional force between gear and Filamentous feed, which drives Filamentous feed to pass through wire feed Conduit is sent out.First auxiliary wheel, the second auxiliary wheel are mounted between reel and gear (pedestal upper right side), installation side Formula is to comply with Filamentous feed pull direction installation, so that Filamentous be fed smooth slide downward.The bracket is fixed on the pedestal Upper end, reel is fixedly mounted in the cantilever tip；The Filamentous feed wound on the reel is successively through being located on pedestal It is sent out after the filament inlet of side, the second auxiliary wheel, the first auxiliary wheel, the crack of gear and driven wheel, wire feeding guiding tube.

The warning device includes filament inlet microswitch, filament inlet combined aural and visual alarm, filament mouth microswitch, filament mouth Combined aural and visual alarm.

Further, the filament inlet microswitch and filament mouth microswitch are all that two-wire system lever roller declines dynamic open It closes, the lever of two microswitches is connected with contact when the state that do not break down, two microswitches when the state that breaks down Lever and contact separation.

Further, the filament inlet microswitch, filament inlet combined aural and visual alarm are separately mounted on the left of filament inlet and the right side Side, the filament mouth microswitch, filament mouth combined aural and visual alarm are separately mounted on the left of wire feeding guiding tube and right side.It works normally When, filament inlet microswitch idler wheel presses on Filamentous feed, and it is thick that filament mouth microswitch idler wheel presses on wire feeding guiding tube lower end At pipe；When lacking the generation of silk failure, filament inlet microswitch idler wheel is hanging, filament inlet microswitch lever and filament inlet microswitch Contact separation；When plug wire failure occurs, filiform feed suffered gravity and frictional force move down wire feeding guiding tube compressed spring, Filament mouth microswitch idler wheel because at this time correspond to wire feeding guiding tube upper end tubule at due to it is hanging, filament mouth microswitch lever with go out Silk mouth microswitch contact separation.

Described control unit includes Micro-processor MCV, the first conditioning circuit, the second conditioning circuit, third conditioning circuit, Four conditioning circuits, driving circuit.First conditioning circuit one end connects filament inlet microswitch, the other end connects microprocessor MCU, for obtaining the status information of filament inlet microswitch and giving MCU；Second conditioning circuit one end connects filament mouth Microswitch, the other end connect Micro-processor MCV, for obtaining the status information of filament mouth microswitch and giving MCU；It is described Third conditioning circuit one end connects filament inlet combined aural and visual alarm, the other end connects Micro-processor MCV, for by the control of microprocessor Information processed gives filament inlet combined aural and visual alarm；4th conditioning circuit one end connection filament mouth combined aural and visual alarm, the other end connect Micro-processor MCV is connect, for giving the control information of microprocessor to filament mouth combined aural and visual alarm.It is specific as follows:

Further, first conditioning circuit one end is connected with SN1, COM1 of filament inlet microswitch, the other end with INT1, GND of Micro-processor MCV are connected；Second conditioning circuit one end is connected with SN2, COM2 of filament mouth microswitch, The other end is connected with INT2, GND of Micro-processor MCV；Third conditioning circuit one end and filament inlet combined aural and visual alarm SN3, COM3 are connected, and the other end is connected with OUT1, GND of Micro-processor MCV；Described 4th conditioning circuit one end and wire vent voice SN4, COM4 of light crossing-signal are connected, and the other end is connected with OUT2, GND of Micro-processor MCV；Described driving circuit one end with give Silk stepper motor is connected, and the other end is connected with SV1, GND of Micro-processor MCV.

Diagnostic method of the present invention uses following steps: Micro-processor MCV carries out system initialization first after system electrification, if Setting INT1, INT2 is floating input port, and setting OUT1, OUT2 are push-pull output mouth, and setting SV1 is pulse delivery outlet, and is enabled The clock of this five mouths.Next step Micro-processor MCV judges whether INT1 mouthfuls be low level, then shows the dress if low level It sets in silk malfunction is lacked, Micro-processor MCV closes SV1 mouthfuls of pulse outputs, OUT1 mouthfuls of output high level at this time, and to send Stepper motor stops working silk immediately, filament inlet combined aural and visual alarm works immediately.Otherwise Micro-processor MCV continues to judge INT2 mouthfuls Whether it is low level, then shows that the device is in plug wire malfunction if low level, Micro-processor MCV closes SV1 mouthfuls at this time Pulse output, OUT2 mouthfuls of output high level, and wire feed stepper motor is stopped working immediately, filament mouth combined aural and visual alarm immediately Work.

Micro-processor MCV through the above steps, moves in circles, and captures event of failure in time.

The invention has the advantages that:

1, the present invention in terms of existing technologies, using microswitch contact with it is non-contact when level signal characteristic come Diagnosis plug wire and scarce silk failure, Machine Design and circuit design greatly simplify, and low manufacture cost, highly reliable, maintenance It is convenient, it is suitable for marketization production.

2, microprocessor need to only read two microswitches of filament inlet and filament mouth output end level signal it is i.e. diagnosable Be out of order type, corresponding sound-light alarm processing is made immediately after identifying fault type, when responding in terms of existing technologies Between it is fast.

3, the folder between gear and driven wheel is away from can be applicable not only to difference by the rotation of elongated bolt come any adjustment The welding manufacture of line footpath solder stick is also applied for FDM (fused glass pellet) increasing material manufacturing.

4, driving gear uses zigzag fashion, on the one hand increases frictional force, and filiform feed is smoothly sent by wire feeding guiding tube Out, welding wire surface on the other hand can be destroyed, keeps the scaling powder of inner core exposed, prevents quick-fried tin phenomenon.

Detailed description of the invention

Fig. 1 is structural representation front view of the invention.

Fig. 2 is structural representation left view of the invention.

Fig. 3 is the circuit diagram of control unit of the present invention.

Fig. 4 is the connection schematic diagram of the first conditioning circuit or the second conditioning circuit of the invention.

Fig. 5 is the connection schematic diagram of third conditioning circuit of the present invention or the 4th conditioning circuit.

Fig. 6 be the present invention in microswitch do not break down state when schematic diagram.

Fig. 7 be the present invention in microswitch break down state when schematic diagram.

Fig. 8 is diagnostic method system flow chart of the invention.

Wherein, 1 pedestal, 2 wire feeding guiding tubes, 3 springs, 4 spring fixed cavities, 5 gears, 6 wire feed stepper motors, 7 driven wheels, 8 removable bottom plates, 9 crossbeams, 10 elongated bolts, 11 first auxiliary wheels, 12 second auxiliary wheels, 13 reels, 14 Filamentous feed, 15 Filament inlet microswitch, 15-1 filament inlet microswitch idler wheel, 15-2 filament inlet microswitch lever, 15-3 filament inlet fine motion are opened Close contact, 16 filament inlet combined aural and visual alarms, 17 filament mouth microswitches, 17-1 filament mouth microswitch idler wheel, 17-2 filament mouth Microswitch lever, 17-3 filament mouth microswitch contact, 18 filament mouth combined aural and visual alarms, 19 Micro-processor MCVs, 20 driving electricity Road, 21 first conditioning circuits, 22 second conditioning circuits, 23 third conditioning circuits, 24 the 4th conditioning circuits, 25 brackets.

Specific embodiment

The present invention will be further explained below with reference to the attached drawings.

As shown in Figure 1, Figure 2, Figure 3 shows, the present invention provides a kind of automation wire feeder of tape jam self-diagnostic function, it Including automatic wire feeding device, warning device, control unit.

The automatic wire feeding device includes pedestal 1, wire feeding guiding tube 2, spring 3, spring fixed cavity 4, gear 5, wire feed step Into motor 6, driven wheel 7, removable bottom plate 8, crossbeam 9, elongated bolt 10, the first auxiliary wheel 11, the second auxiliary wheel 12, bracket 25 With reel 13.

Further, for a upper end, thin, the thick formula in lower end hollow body, 3 sets of the spring are being sent the wire feeding guiding tube 2 2 middle-end of silk conduit, the two are relatively fixed, and are installed in the spring fixed cavity 4, the fixed peace of the spring fixed cavity 4 Loaded on 1 bottom of pedestal.Wire feed stepper motor 6 (embodiment of the present invention matches 42HS08 type stepper motor using the thunder) installation In 1 rear end of pedestal, the gear 5 is mounted on the output shaft of the wire feed stepper motor 6, is located at 1 front end of pedestal. The driven wheel 7, crossbeam 9 are fixedly installed in removable 8 left end of bottom plate, right end respectively, and the removable floor shifting pedestal is right It holds and horizontal sliding can be made relative to pedestal.The elongated bolt 10 passes through 1 right side screw hole of pedestal and contacts with 9 phase of crossbeam, leads to Cross and rotate elongated bolt 10 can to make removable 8 left and right horizontal of bottom plate mobile, so make Filamentous feed 14 grip in driven wheel 7 with Between gear 5.The rotation of wire feed stepper motor 6 can make to generate frictional force between gear 5 and Filamentous feed 14, the frictional force band Dynamic Filamentous feed 14 is sent out by the wire feeding guiding tube 2.It is right that first auxiliary wheel 11, the second auxiliary wheel 12 are mounted on pedestal 1 Top, mounting means are to comply with the 14 pull directions installation of Filamentous feed, are conducive to Filamentous feed 14 and smoothly glide, such as: make Filiform feed is in the installation of bending type.

The warning device include filament inlet microswitch 15, filament inlet combined aural and visual alarm 16, filament mouth microswitch 17, Filament mouth combined aural and visual alarm 18.In the embodiment of the present invention: the filament inlet microswitch and filament mouth microswitch are all made of perseverance Section's electronics G5T16-A06 type idler wheel pressure lever type microswitch；The filament inlet combined aural and visual alarm and the filament mouth sound-light alarm Device is all made of port love electric appliance AD16-16SM type combined aural and visual alarm.

Further, the filament inlet microswitch 15 is all that two-wire system lever roller declines with filament mouth microswitch 17 Dynamic switch.As shown in figure 4, do not break down state when microswitch lever be connected with contact；As shown in figure 5, the shape that breaks down Microswitch lever and contact separation when state.

Further, the filament inlet microswitch 15, filament inlet combined aural and visual alarm 16 are separately mounted on the left of filament inlet With right side, the filament mouth microswitch 17, filament mouth combined aural and visual alarm 18 are separately mounted to 2 left side of wire feeding guiding tube and right side. When normal work, filament inlet microswitch idler wheel 15-1 is pressed on Filamentous feed 14, and filament mouth microswitch idler wheel 17-1 is pressed It is pressed at 2 lower end extra heavy pipe of wire feeding guiding tube；When lacking the generation of silk failure, filament inlet microswitch idler wheel 15-1 is hanging, filament inlet fine motion Switch lever 15-2 is separated with filament inlet microswitch contact 15-3；When plug wire failure occurs, power suffered by filiform feed 14 makes It obtains 2 compressed spring 3 of wire feeding guiding tube to move down, filament mouth microswitch idler wheel 17-1 is due to corresponding at 2 upper end tubule of wire feeding guiding tube Vacantly, filament mouth microswitch lever 17-2 is separated with filament mouth microswitch contact 17-3.

Described control unit includes Micro-processor MCV 19, the first conditioning circuit 21, the second conditioning circuit 22, third conditioning Circuit 23, the 4th conditioning circuit 24, driving circuit 20.In the embodiment of the present invention: Micro-processor MCV is real using STC89C52 chip Existing, the driving circuit matches DM422C type driver using thunder.

Further, described first conditioning circuit, 21 one end is connected with SN1, COM1 of filament inlet microswitch 15, another End is connected with INT1, GND of Micro-processor MCV 19；Described second conditioning circuit, 22 one end and filament mouth microswitch 17 SN2, COM2 are connected, and the other end is connected with INT2, GND of Micro-processor MCV 19；Described 23 one end of third conditioning circuit with enter SN3, COM3 of silk voice light crossing-signal 16 are connected, and the other end is connected with OUT1, GND of Micro-processor MCV 19；Described 4th 24 one end of conditioning circuit is connected with SN4, COM4 of filament mouth combined aural and visual alarm 18, the other end and Micro-processor MCV 19 OUT2, GND are connected；Described 20 one end of driving circuit is connected with wire feed stepper motor 6, the other end and Micro-processor MCV 19 SV1, GND are connected.Wherein, OUT1, OUT2, SV1, INT1, INT2 can be any input/output port of MCU, compile in program By OUT1 in volume, the connect port OUT2, SV1 is set as output port, and the connect port INT1 INT2 is set as input port.

Wire feeder method for diagnosing faults is automated referring to Fig. 6, the specific steps are as follows:

Step 602: Micro-processor MCV carries out system initialization first, and setting INT1, INT2 are floating input port, setting OUT1, OUT2 are push-pull output mouth, SV1 pulse delivery outlet are arranged, and enable the port clock of this five mouths, execute step 604；

Step 604: Micro-processor MCV judges whether INT1 mouthfuls be low level, then shows that the device is in if low level Silk malfunction is lacked, step 606 is executed, it is no to then follow the steps 608；

Step 606: Micro-processor MCV makes OUT1 mouthfuls of output high level, lacks hiss(ing) light crossing-signal at this time and works immediately, then Execute step 612；

Step 608: Micro-processor MCV judges whether INT2 mouthfuls be low level, then shows that the device is in if low level Plug wire malfunction executes step 610, no to then follow the steps 604；

Step 610: Micro-processor MCV makes OUT2 mouthfuls of output high level, and plug wire combined aural and visual alarm works immediately at this time, then Execute step 612；

Step 612: Micro-processor MCV closes SV1 mouthfuls of pulse outputs, and wire feed stepper motor stops working immediately at this time.

Micro-processor MCV is from after system electrification, and through the above steps, continuous cycle detection is until failure generates.

The series of detailed descriptions listed above only for feasible embodiment of the invention specifically Protection scope bright, that they are not intended to limit the invention, it is all without departing from equivalent implementations made by technical spirit of the present invention Or change should all be included in the protection scope of the present invention.

Claims (10)

1. a kind of automatic wire feeding device of tape jam self-diagnostic function characterized by comprising automatic wire feeding device, alarm dress It sets, control unit；

The automatic wire feeding device include pedestal (1), wire feeding guiding tube (2), spring (3), gear (5), wire feed stepper motor (6), Driven wheel (7), reel (13)；The wire feeding guiding tube (2) thin, the thick formula in lower end hollow body for upper end, spring (3) set In the wire feeding guiding tube (2) middle-end, the two is relatively fixed；The spring (3) is fixed on the pedestal (1) bottom；The wire feed Stepper motor (6) is mounted on the pedestal (1) rear end, and the gear (5) is mounted on the output shaft of the wire feed stepper motor (6) On, the driven wheel (7) and the gear (5) are matched for clamping tightly Filamentous feed (14)；The reel (13) is located at the pedestal (1) above, the Filamentous feed (14) is wound thereon；The Chuck top is equipped with the filament inlet of Filamentous feed；

The warning device includes filament inlet microswitch (15), filament inlet combined aural and visual alarm (16), filament mouth microswitch (17), filament mouth combined aural and visual alarm (18)；The filament inlet microswitch (15), which is able to detect that, lacks Filamentous condition, the filament mouth Microswitch (17) is able to detect that plug wire situation；The filament inlet combined aural and visual alarm (16) is for lacking silk alarm, the wire vent Voice light crossing-signal (18) is alarmed for plug wire；

Described control unit includes microprocessor (19), the first conditioning circuit (21), the second conditioning circuit (22), third conditioning electricity Road (23), the 4th conditioning circuit (24), driving circuit (20)；First conditioning circuit (21) is separately connected filament inlet fine motion and opens Close (15) and microprocessor (19)；Second conditioning circuit (22) is separately connected filament mouth microswitch (17) and microprocessor (19)；The third conditioning circuit (23) is separately connected filament inlet combined aural and visual alarm (16) and microprocessor (19)；Described 4th Conditioning circuit (24) is separately connected filament mouth combined aural and visual alarm (18) and microprocessor (19)；The driving circuit (20) connects respectively Connect microprocessor (19) and wire feed stepper motor (6)；The microprocessor (19) on the one hand control stepper motor rotation, another party Face, which detects the status information of two microswitches and controls alarm, carries out corresponding warning note.

2. a kind of automatic wire feeding device of tape jam self-diagnostic function according to claim 1, which is characterized in that further include Removable bottom plate (8), the removable bottom plate (8) can make horizontal sliding relative to pedestal (1)；Driven wheel (7) setting On the removable bottom plate (8).

3. a kind of automatic wire feeding device of tape jam self-diagnostic function according to claim 2, which is characterized in that it is described can Further include crossbeam (9) on movable base plate (8), is equipped with elongated bolt (10) on the right side of the pedestal (1)；The elongated bolt (10) is worn It crosses screw hole on the right side of pedestal mutually to contact with the crossbeam, the elongated bolt (10) can control removable bottom plate (8) when rotated It is left and right to move horizontally.

4. a kind of automatic wire feeding device of tape jam self-diagnostic function according to claim 1, which is characterized in that further include It is fixed on the spring fixed cavity (4) of the base bottom；The spring is fixed in the spring fixed cavity (4).

5. a kind of automatic wire feeding device of tape jam self-diagnostic function according to claim 1, which is characterized in that further include First auxiliary wheel (11) and the second auxiliary wheel (12)；First auxiliary wheel (11), the second auxiliary wheel (12) are mounted on reel (13) between gear (5), mounting means is to comply with Filamentous feed pull direction installation, so that Filamentous feed is smoothly to downslide It is dynamic.

6. a kind of automatic wire feeding device of tape jam self-diagnostic function according to claim 1, which is characterized in that further include Bracket (25)；The bracket (25) is fixed at the top of the pedestal (1), and the reel (13) is fixed on the bracket (25) Face.

7. a kind of automatic wire feeding device of tape jam self-diagnostic function according to claim 1, which is characterized in that it is described enter Silk mouth microswitch (15) and the filament mouth microswitch (17) are two-wire system lever roller formula microswitch；It works normally When, filament inlet microswitch (15) idler wheel can press on Filamentous feed (14), and filament mouth microswitch (17) idler wheel can It presses at the extra heavy pipe of wire feeding guiding tube (2) lower end；When lacking the generation of silk failure, filament inlet microswitch idler wheel can be hanging；Plug wire event When barrier occurs, filament mouth microswitch idler wheel can be hanging after wire feeding guiding tube compressed spring moves down.

8. a kind of automatic wire feeding device of tape jam self-diagnostic function according to claim 1, which is characterized in that described One conditioning circuit (21) is identical as the second conditioning circuit (22), is realized by resistance.

9. a kind of automatic wire feeding device of tape jam self-diagnostic function according to claim 1, which is characterized in that described Three conditioning circuits (23) are identical as the 4th conditioning circuit (24), real by triode, diode, relay and peripheral resistance It is existing.

10. a kind of diagnostic method of the automatic wire feeding device of tape jam self-diagnostic function, which is characterized in that microprocessor is in system After powering on, by following steps, continuous cycle detection is until failure generates；Specific steps include the following:

Step 602: Micro-processor MCV carries out system initialization first, and setting INT1, INT2 are floating input port, setting OUT1, OUT2 is push-pull output mouth, SV1 pulse delivery outlet is arranged, and enable the control clock of this five ports, executes step 604；

Step 604: Micro-processor MCV judges whether INT1 mouthfuls be low level, then shows that the device is in if low level and lacks silk Malfunction executes step 606, no to then follow the steps 608；

Step 606: Micro-processor MCV makes OUT1 mouthfuls of output high level, lacks hiss(ing) light crossing-signal at this time and works immediately, then executes Step 612；

Step 608: Micro-processor MCV judges whether INT2 mouthfuls be low level, then shows that the device is in plug wire if low level Malfunction executes step 610, no to then follow the steps 604；

Step 610: Micro-processor MCV makes OUT2 mouthfuls of output high level, and plug wire combined aural and visual alarm works immediately at this time, then executes Step 612；

Step 612: Micro-processor MCV closes SV1 mouthfuls of pulse outputs, and wire feed stepper motor stops working immediately at this time.