A kind of reinforcing-bar binding machine automatically
Technical field
The present invention relates to binding reinforcing bars field, particularly to the automatic reinforcing-bar binding machine of one.
Background technology
Along with improving constantly of recent year human cost, meanwhile, people are to working environment
And the demand of labor intensity also gets more and more, the particularly highly intensive labour of building trade and difficult
Bitter working environment is especially prominent.Equally, in European and American developed countries, enterprise is not only to answer
To higher labor cost and relatively low work efficiency and work quality, also to tackle
Many demands such as working strength is discontented with by people.Thus, how realizing industrial automation has been
Entire society development important topic, then, the low intensive tool of production of high efficiency slowly by
People are accepted, and the most also include automatic reinforcing-bar binding machine.But, due to existing automatic steel
Muscle strapper has the disadvantage in that
1. volume is big, and the heaviest causing operates and carry inconvenience;
2., after reinforcing bar pricked by machine, running is not clear-cut, affects working effect and operating efficiency;
3. complex manufacturing, cost is high, be difficult to promote.
For above-mentioned reasons, automatic reinforcing-bar binding machine is caused not to be promoted and popularize.
Therefore, existing automatic reinforcing-bar binding machine need further to improve and reform.
Summary of the invention
For technical problem present in prior art, it is an object of the invention to: one is provided
Compact conformation, torsion wire mechanism can opening and closing and the clear-cut automatic reinforcing-bar binding machine of running automatically.
The purpose of the present invention is achieved through the following technical solutions: a kind of reinforcing-bar binding machine automatically,
Including shell and torsion wire mechanism, described torsion wire mechanism includes rotating bar, chuck, anti-off line
Structure, sleeve and spring, described rotation bar has thread segment, and described chuck includes chuck
Body and torsion wire claw, Gripper body one end has spring storehouse, the other end and described torsion wire
Claw is hinged, and spring is contained in spring storehouse, rotates bar front end and puts in the spring of Gripper body
It is connected in spring storehouse be connected with spring in storehouse and by described escapement;
Having cogged drive belt on described sleeve outer surface, described cogged drive belt includes a long tooth
With several short teeth, described sleeve interior surface has and matches with the thread segment rotated on bar
The thread connected, described rotation bar and Gripper body be connected in sleeve, torsion wire claw
Also it is hinged on sleeve;
The position of shell correspondence cogged drive belt is provided with lower pawl type tolerance bit slice and upper ratchet
The narrow banking stop of formula;
During torsion wire claw is held tightly, the narrow banking stop of upper pawl type limits long tooth from lower to upper
Rotate, and on long tooth edge, the narrow banking stop of pawl type slides in and out under rotating bar propelling movement;
When torsion wire claw is by holding tightly in opening procedure, lower pawl type tolerance bit slice limits long tooth
Or short tooth rotates from top to bottom, and under rotating bar pull long tooth or short tooth along under pawl type
Tolerance bit slice slid inward;
When torsion wire claw is in open mode, lower pawl type tolerance bit slice limits long tooth by upper
Down rotate.
Preferably, described sleeve includes inner core and urceolus, and inner core fixed cover is in urceolus, interior
The thread segment position of tube wall surface correspondence rotation bar offers inlays hole, and described thread is thread
Block, thread block embed described in inlay in hole, cogged drive belt is arranged on the outer surface of urceolus.
Preferably, also include filament cutting mechanism, filament cutting mechanism include sliver-cutting frame, compression spring with
And middle part is hinged on the cutting knife on described sliver-cutting frame or wire feeder, described sleeve has cutter
Tool triggers cam, and described compression spring two ends are connected to above the handle of a knife of cutting knife and shredding
On frame, the handle of a knife bottom of cutting knife is triggered cam with cutter and is contacted.
Preferably, the highest point of described cutter triggering cam has a normal throw face.
Preferably, described escapement includes anticreep abaculus, offers anti-on Gripper body
Deintercalation hole, is protruding with anticreep bulge loop rotating bar end, and anticreep abaculus inlays in anti-deintercalation
It is stuck in behind hole at the rear portion of anticreep bulge loop.
Preferably, also including drive system, drive system includes that buffer gear and power are defeated
Enter gear, the one side of power input gear has the first curved buffering chute, slow
Punch mechanism includes that output wheel, output wheel one side are protruding with the first drive block, described first
Drive block is connected in the first buffering chute;
Rotate bar to be in transmission connection with power input gear, rotate bar and be also slidably connected at output wheel
Centre bore in;
The radian of described first buffering chute makes torsion wire claw by holding tightly equal to or more than rotating bar
To the angle opening required rotation.
Preferably, also including drive system, drive system includes that buffer gear and power are defeated
Enter gear, the one side of power input gear has the first curved buffering chute, slow
Punch mechanism includes that output wheel and buffering wheel, output wheel one side are protruding with the first drive block,
Described buffering wheel one side is protruding with the second drive block, and another side has curved
Two buffering chutes, the second drive block is connected in the first buffering chute, and the first drive block connects
In the second buffering chute;
The radian sum of the first buffering chute and the second buffering chute makes equal to or more than rotating bar
Torsion wire claw is opened the angle of required rotation by holding tightly;
Rotate bar to be in transmission connection with power input gear, rotate bar and be also slidably connected at buffering wheel
With in the centre bore of output wheel.
Preferably, described buffering wheel is three, and the second drive block of the buffering wheel of rear stage is even
Receive in the second buffering chute of previous stage, the first buffering chute and three the second buffering chutes
Length sum make torsion wire claw open rotated row by holding tightly equal to or more than rotating bar
The length of journey.
Preferably, also including motor and wire feeder, wire feeder includes wire feed driver
Structure, wire-feeding transmission mechanism includes two wire feed rolls, unilateral bearing and wire feed power input gear,
Two wire feed rolls are meshed, and the flank of tooth of two wire feed rolls is correspondingly provided with wire feeding trough, and wire feed power inputs
Gear is connected with one of them wire feed rolls by unilateral bearing, and described motor inputs with power
Gear connects, and output wheel is connected with wire feed power input gear.
Preferably, also including wire feeder, wire feeder includes lower receipts silk mouth and c-type head,
Lower receipts silk mouth is articulated with c-type head bottom, c-type head have on torsion wire direction prevent iron wire turn round
Produce the upper gear door of deflection during Si, described lower receipts silk mouth have with upper gear door tiltedly to anti-
Only iron wire produces the lower block door of deflection during torsion wire.
The present invention has such advantages as relative to prior art and effect:
1, present configuration compact and can accurately wire feed and torsion wire, and wire tie is effective,
Qualification rate is high, and torsion wire can be smoothly between the automatic reinforcing-bar binding machine of the present invention and iron wire knot after completing
Separating, meanwhile, the present invention is quick on the draw and is readily produced manufacture, reduces manufacturing cost,
The present invention only needs a motor can realize working continuously, the most lightweight little, easily with volume
In operation and use, efficiency is high.
Accompanying drawing explanation
Fig. 1 is the partial structurtes schematic diagram of the present invention.
Fig. 2 is the structural representation after Fig. 1 pulls down c-type head.
Fig. 3 is the axonometric chart of Fig. 1.
Fig. 4 is the partial structurtes schematic diagram of Fig. 1.
Fig. 5 is the axonometric chart of Fig. 4.
Fig. 6 is the torsion wire claw open configuration schematic diagram of the torsion wire mechanism of the present invention.
Fig. 7 is that the torsion wire claw of the torsion wire mechanism of the present invention holds view tightly.
Fig. 8 is the semi-cutaway of Fig. 7.
Fig. 9 is the explosive view of the torsion wire mechanism of the present invention.
Figure 10 is torsion wire mechanism and lower pawl type tolerance bit slice and the narrow limit of upper pawl type of the present invention
The position relationship structural representation of bit slice.
Figure 11 is the structural representation that the thread segment of the present invention is in mating connection with thread.
Figure 12 is that the power input gear of the present invention, three buffering wheels and output wheel install signal
Figure.
Figure 13 is the structural representation of another angle of Figure 12.
Figure 14 is the structural representation of the c-type head of the present invention.
Figure 15 is the structural representation of the lower receipts silk mouth of the present invention.
Figure 16 is to use the present invention that iron wire tightens the schematic diagram in two reinforcing bar intersections.
Figure 17 is that iron wire is in the schematic diagram tightened under deflected condition.
Figure 18 be the iron wire of Figure 17 deflection reset after tightening produce loosen schematic diagram.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but this
Bright embodiment is not limited to this.
Embodiment one:
A kind of reinforcing-bar binding machine automatically, including shell 1, motor 2, wire feeder 3, filament cutter
Structure 4, drive system 5 and torsion wire mechanism 6, described torsion wire mechanism 6 includes rotating bar 7, chuck
8, escapement 9, sleeve 10 and spring 11, described rotation bar 7 has thread segment 12,
Described chuck 8 includes that Gripper body 13 and torsion wire claw 14, Gripper body 13 one end have bullet
Spring storehouse 15, the other end is hinged with described torsion wire claw 14, and spring 11 is contained in spring storehouse 15,
Rotate bar 7 front end to put in the spring storehouse 15 of Gripper body 13 and by described escapement 9 company
It is connected in spring storehouse 15 and is connected with spring 11;
On described sleeve 10 outer surface, there is cogged drive belt, described cogged drive belt include one long
Tooth 16 and 7 short teeth 17, thread segment 12 phase sleeve 10 inner surface having with rotating on bar 7
The thread 18 being connected, described rotation bar 7 and Gripper body 13 are connected to sleeve 10
In, torsion wire claw 14 is also hinged at the end port of sleeve 10;
The position of the corresponding cogged drive belt of shell 1 is provided with lower pawl type tolerance bit slice 19 and upper
The narrow banking stop of pawl type 20;
During torsion wire claw 14 is held tightly, the narrow banking stop of upper pawl type 20 limit long tooth 16 by
Under up rotate, and rotate bar 7 thread segment 12 push under long tooth 16 along on pawl type narrow
Banking stop 20 slides in and out;
When torsion wire claw 14 is by holding tightly in opening procedure, lower pawl type tolerance bit slice 19 limits
Long tooth 16 or short tooth 17 rotate from top to bottom, and long under thread segment 12 pull rotating bar 7
Tooth 16 or short tooth 17 extend the deadline bit slice 19 slid inward along lower pawl type;
When torsion wire claw 14 is in open mode, lower pawl type tolerance bit slice 19 limits long tooth
16 rotate from top to bottom.
Reducing manufacturing cost for reducing the manufacture difficulty of sleeve 10, described sleeve 10 includes simultaneously
Inner core 21 and urceolus 22, inner core 21 fixed cover is in urceolus 22 and by radially connected bolt
Together with being fixed with urceolus 22 by inner core 21, inner core 21 wall correspondence rotates the thread segment of bar 7
12 positions offer inlays hole 23, and described thread 18 is thread block, and thread block embeds described
Inlaying in hole 23, cogged drive belt is arranged on the outer surface of urceolus 22.
Described filament cutting mechanism 4 includes that sliver-cutting frame, compression spring and middle part are hinged on described shredding
Cutting knife 24 on frame or wire feeder, described sleeve 10 has cutter and triggers cam 25, institute
Stating compression spring two ends to be connected on handle of a knife top and the sliver-cutting frame of cutting knife 24, cutter touches
Send out cam 25 and be arranged on the handle of a knife bottom of cutting knife 24.Under normality, compression spring is by cutting knife 24
Handle of a knife is pressed in cutter and triggers on the outer surface of cam 25, and during cut-out, cutter triggers 25 turns of cam
Dynamic control cutting knife 24 action, thus realize automatically cutting off and the reset of cutting knife 24.
Avoid cutting knife 24 to reset slowly for making cutting knife 24 to reset rapidly and cause blocking filament mouth,
Described cutter triggers the highest point of cam 25 and has a normal throw face 26, the cutting edge of cutting knife 24
42 are arranged at filament mouth.Slide into the highest when the handle of a knife of cutting knife 24 triggers cam 25 along cutter
During place, the cutting edge 42 of cutting knife 24, to incision, completes when sliding into highest point to cut off;
Cutter triggers cam 25 and is rotated further, and causes cutting knife owing to highest point has normal throw face 26
When the handle of a knife of 24 arrives highest point, under the effect of compression spring, the handle of a knife of described cutting knife 24 is dashed forward
So hurtle down, so that the rapid lifting of cutting edge 42 of cutting knife 24 resets, it is to avoid immediately get off
During wire feed, the cutting edge 42 of cutting knife 24 blocks filament mouth again.
Described escapement 9 includes anticreep abaculus 27, offers anti-deintercalation on Gripper body 13
Hole 28, is protruding with anticreep bulge loop 29 rotating bar 7 end, and anticreep abaculus 27 inlays at anticreep
It is stuck in behind embedding hole 28 at the rear portion of anticreep bulge loop 29, in case spline lever 7 pine from spring storehouse 15
Take off.
Simultaneously drive torsion wire mechanism 6 and wire feeder 3 for reaching a motor 2, complete wire feed
Rear horse back starts torsion wire makes whole work process the most accurately carry out, and when working each other not
Impacted, described drive system 5 includes buffer gear 30 and power input gear 31, power
There is on the one side of input gear 31 the first curved buffering chute 32, buffer gear 30
Including output wheel 33, on output wheel 33 one side, the position of corresponding first buffering chute 32 is protruded
The first drive block 34, described first drive block 34 is had to be slidably connected in the first buffering chute 32;
The radian of described first buffering chute 32 makes torsion wire claw 14 equal to or more than rotating bar 7
Rotated angle is opened by holding tightly.
Rotate bar 7 to be in transmission connection with power input gear 31, rotate bar 7 also by bearing 35 even
It is connected in the centre bore of output wheel 33.
Owing to driving of torsion wire mechanism 6 and wire feeder 3 can be realized only with a motor 2
Dynamic, therefore drive respectively without two motors, decrease volume and weight and be easy to carry and make
With, reduce production cost simultaneously.
Described wire feeder 3 includes that wire-feeding transmission mechanism, wire-feeding transmission mechanism include two wire feed rolls
40, unilateral bearing 44 and wire feed power input gear 36, two wire feed rolls 40 are meshed, and two
The flank of tooth of wire feed rolls 40 is correspondingly provided with wire feeding trough 41, and wire feed power input gear 36 is by unidirectional
Bearing 44 is connected with one of them wire feed rolls, and wire feed power input gear 36 is angular wheel,
Described motor 2 is connected with power input gear 31, and output wheel 33 is connected with angular wheel.
Described wire feeder 3 also includes that lower receipts silk mouth 46 and c-type 47, lower receipts silk mouth 46 are cut with scissors
Being connected to c-type 47 bottom, c-type 47 has on torsion wire direction and prevents iron wire in torsion wire process
The upper gear door 48 of middle generation deflection, described lower receipts silk mouth 46 have with upper gear door 48 tiltedly to anti-
Only iron wire produces the lower block door 49 of deflection during torsion wire.It should be noted that gear door 48
Decision is turned to, specifically when being to tighten according to torsion wire mechanism 6 with lower block door 49 particular location
, when setting torsion wire mechanism 6 is when rotating clockwise as tightening iron wire, and upper gear door 48 is then arranged
Lower right then it is arranged at upper left side lower block door 49;Turning counterclockwise when setting torsion wire mechanism 6
When moving as tightening iron wire, upper gear door 48 is then arranged on upper right side lower block door 49 and is then arranged on a left side
Lower section.
When being hinged on wire feeder 3 in the middle part of cutting knife 24, it is preferred that hinged in the middle part of cutting knife 24
In the c-type 47 of wire feeder 3.
Embodiment two:
The present embodiment is with embodiment one difference: described drive system 5 includes buffer
Structure 30 and power input gear 31, the one side of power input gear 31 has curved
The first buffering chute 32, buffer gear 30 includes output wheel 33 and buffering wheel 37, output
Taking turns 33 one side and be protruding with the first drive block 34, described buffering wheel 37 one side is protruding with
Two drive blocks 38, another side has the second curved buffering chute 39, the second transmission
Block 38 is connected in the first buffering chute 32, and the first drive block 34 is connected to the second buffering chute
In 39;
The radian sum of the first buffering chute 32 and the second buffering chute 39 is equal to or more than rotating
Bar 7 makes torsion wire claw 14 by holding the angle opening required rotation tightly;
Rotate bar 7 to be in transmission connection with power input gear 31, rotate bar 7 also by bearing 35 even
It is connected in the centre bore of buffering wheel 37 and output wheel 33.
For increasing buffering capacity to adapt to higher requirement, it is preferred that described buffering wheel 37 is three
Individual, three buffering wheels stack together mutually, wherein the second drive block of the buffering wheel of rear stage
It is connected in the second buffering chute of previous stage, the first buffering chute and three the second snubber slides
The radian sum of groove equal to or more than rotate bar 7 make torsion wire claw 14 by hold tightly open required
The angle rotated.
The work process of the present invention and operation principle:
Silking process:
When motor positive direction rotates, power input gear is driven to rotate, owing to now buffering
Wheel is in triggering state that is second drive block and is in the end of the first buffering chute, rear stage
The second drive block of buffering wheel be in the end of the second buffering chute of previous stage, first
Drive block is in the end of the second buffering chute, therefore, the power quilt of power input gear
Being transferred directly to output wheel, output wheel drives wire feeder to realize weaving silk;And torsion wire now
The torsion wire claw of mechanism is in open mode, therefore descend pawl type tolerance bit slice limit long tooth by
On down rotate, torsion wire mechanism do not produce rotation and slide, concrete, although rotate bar also
It is connected with power input gear and concomitant rotation, but it turns to and turns to contrary i.e. screw thread with screw thread
Skid between the arrival end of section and thread, and thread segment can not match with thread, because of
This torsion wire mechanism does not produce rotationally and axially slides.
Torsion wire process:
When, after preseting length of weaving silk, motor stops rotating forward, and starts reversion and carries out torsion wire action,
During motor reversal, driving power input gear to rotate backward, now buffering wheel is in buffering shape
State that is first buffering chute rotates, and the second drive block of the buffering wheel of the first order is in the first buffering
When in chute, slip is back to the top of the first buffering chute, the second of the buffering wheel of the first order
Drive block is driven by the top of the first buffering chute, and now, first order buffering wheel is driven
Rotating, the second drive block of the buffering wheel of the second level is in the second buffering of the buffering wheel of the first order
Sliding in chute, the second drive block of the buffering wheel of the second level is back to first order buffering wheel
During the top of the second buffering chute, the buffering wheel of the second level is driven, the buffering wheel of the third level
Second drive block buffering wheel in the second level the second buffering chute in slide, the third level
Second drive block of buffering wheel is back to the top of the second buffering chute of second level buffering wheel
Time, the buffering wheel of the third level is driven, the first drive block the third level buffering wheel second
Sliding in buffering chute, the first drive block is back to the second buffering chute of third level buffering wheel
Top time, power is transported at output wheel;While buffering wheel is in buffer status,
Rotation bar is reversed the i.e. torsion wire claw of drive and holds tightly, and the narrow banking stop of upper pawl type limits long
Tooth rotates from lower to upper, and under the thread segment rotating bar pushes, on long tooth edge, pawl type is narrow simultaneously
Banking stop slides in and out;Concrete, the thread segment rotating bar matches with thread, by
Limit long tooth in the narrow banking stop of upper pawl type to rotate from lower to upper, therefore rotate the thread segment of bar
Sleeve can only be pushed by thread to move forward, and chuck is motionless with rotation bar position, thus
Making torsion wire claw embrace iron wire, while torsion wire claw embraces iron wire, long tooth departs from upper ratchet
The narrow banking stop of formula, torsion wire mechanism produces and rotates, carries out torsion wire, owing to the number of turns of torsion wire is root
Depending on practical situation, the number of turns i.e. turned round is uncertain, therefore, at the wire feed of wire feeder
Unilateral bearing it is provided with, even if the most now the buffer status of buffering wheel is on drive mechanism
Terminating, power is when output wheel is transferred to wire feed power input gear, and unilateral bearing skids and makes
Two wire feed rolls do not produce rotation, therefore when torsion wire mechanism is at torsion wire, and wire feeder not wire feed;
Reach a motor and simultaneously drive torsion wire mechanism and wire feeder, and be independent of each other each other.
Torsion wire mechanism produce rotation carry out torsion wire time, cutter on sleeve trigger cam also with
Rotation, the handle of a knife of cutting knife triggers cam slide to highest point along cutter, the cutting edge of cutting knife to
Incision, completes when sliding into highest point to cut off;Cutter triggers cam and is rotated further, due to
When highest point has the handle of a knife arrival highest point that cutting knife is caused in normal throw face, at compression spring
Effect under the handle of a knife of described cutting knife hurtle down, so that the rapid lifting of the cutting edge of cutting knife is multiple
Position, it is to avoid the cutting edge blocking filament mouth of cutting knife during wire feed again.
When cutting off iron wire and carrying out torsion wire, often iron wire is affected by torsion and is intersected at two reinforcing bars
Place produces deflection, and the iron wire of deflection can produce the phenomenon causing loosening that resets after tightening, for
Avoid this loosening phenomenon to occur, be provided with gear door and lower block door on direction tightening,
Concrete, when tightening clockwise, upper gear door and lower block door respectively to being rotated up and
The iron wire rotated down stops so that it is do not produce deflection, it is ensured that torsion wire mechanism can be smooth
Tighten and do not produce loosening, after tightening, owing to lower receipts silk mouth can rotate down along hinged place,
Therefore when automatic reinforcing-bar binding machine separates with iron wire, lower receipts silk mouth produces and dodges, and makes automatically
Reinforcing-bar binding machine separates with iron wire smoothly, it is to avoid occur that iron wire blocks and indissociable phenomenon
Occur.
Reseting procedure:
When torsion wire complete rear motor can immediately from reversion again enter positive direction rotary state, now,
Torsion wire claw is opened by holding tightly, lower pawl type tolerance bit slice limit long tooth or short tooth from toward
Lower rotation, simultaneously under the thread segment pull rotating bar long tooth or short tooth along under the pawl type tolerance
Bit slice slid inward;Concrete, motor positive direction rotates, and rotates the thread segment of bar i.e. from spiral shell
Tooth spins out, so that torsion wire claw is opened, owing to lower pawl type tolerance bit slice limits
Long tooth or short tooth rotate from top to bottom, therefore long tooth or short under the thread segment pull rotating bar
Tooth extends the deadline bit slice slid inward along lower pawl type, now, if short tooth is extended the deadline along lower pawl type
Bit slice slid inward, owing to the pull stroke of thread segment extends the deadline position more than short tooth along lower pawl type
The stroke of sheet slid inward and be shorter than the long tooth row along lower pawl type tolerance bit slice slid inward
Journey, when therefore sliding into end in short teeth directional, short tooth can be separated from lower pawl type tolerance position
Sheet, now, torsion wire mechanism produces and rotates, until long tooth and lower pawl type tolerance bit slice connect
Touching, such being advantageous in that can ensure that the two torsion wire claws opened are in a position set
Put, make torsion wire claw can hold iron wire the most smoothly tightly each time and realization tightens.
During until thread segment screws out thread completely, long tooth is stuck on lower pawl type tolerance bit slice,
Sleeve stop slid inward, now, although rotate bar be also connected with power input gear and with
Rotation, but it turns to turn to screw thread and skids between the arrival end of contrary i.e. thread segment and thread,
And thread segment can not match with thread, therefore torsion wire mechanism does not produce rotation and axle
To slip.And now, the handle of a knife of cutting knife is in the front in normal throw face, the cutting edge of cutting knife
It is in the top of filament mouth, it is ensured that wire feed process is smooth and easy the most blocked.
While torsion wire claw is by holding tightly and opening, buffering wheel then by buffer status to triggering
State reset, this process is contrary with buffer status work process, no longer describes at this.Need
Illustrate is that the radian sum of the first buffering chute and three the second buffering chutes equals to or more than
Rotating bar makes torsion wire claw open rotated angle by holding tightly, so can ensure that torsion wire
After claw fully opens, wire feeder carries out wire feed again, it is ensured that can stablize during torsion wire every time
Be carried out continuously, it is to avoid cause damage, with carrying out next time after completing one-step bundling
Tie up.
Described spring is constantly in compressive state after being installed to spring storehouse, spring effect is:
1, after thread segment screws out thread completely, the arrival end of thread segment and thread when skidding,
Under the action of the spring, thread segment remains and the thread close contact i.e. entrance of thread segment
End and thread keep slipping state to leave thread without arrival end thread segment occur, cause
When rotation bar turns to and turns to identical with thread segment, thread segment can not couple together with thread.
Therefore arrange spring to be advantageous in that when rotating turning to change over and turning to identical with thread segment of bar
Time, the arrival end of thread segment can cooperate rapidly with thread, make the present invention work sensitiveer,
Work efficiency is higher.
2, when short tooth is separated from lower pawl type tolerance bit slice, under the action of the spring, can protect
Card torsion wire mechanism produces rotation makes long tooth and lower pawl type tolerance bit slice contact, it is to avoid screw thread
Frictional force between section and thread is too small, causes thread that urceolus can not be driven to rotate, makes work more
Stable.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are also
Being not restricted to the described embodiments, other any spirit without departing from the present invention is with former
Change that reason is lower to be made, modify, substitute, combine, simplify, all should be the displacement side of equivalence
Formula, within being included in protection scope of the present invention.