Patent Publication Number: US-11643231-B2

Title: Material feeding, distributing, and pushing mechanism of tying tool, automated tying tool, and automated tying method

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present disclosure claims the priority to the Chinese patent application with the filing number 2018101066432 filed on Feb. 2, 2018 with the Chinese Patent Office, and entitled “Automated Tying Tool”, and the Chinese patent application with the filing number 2019100878080 filed on Jan. 29, 2019 with the Chinese Patent Office, and entitled “Material Feeding, Distributing and Pushing Mechanism of Tying Tool and Automated Tying Method”, which are incorporated herein by reference in entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to the technical field of binding equipment, in particular to a material feeding, separating and pushing mechanism of a tying tool (i.e., a mechanism for feeding, separating and pushing a material fora tying tool), an automated tying tool and an automated tying method. 
     BACKGROUND ART 
     Common plastic ties have a square head, all of existing automated tying tools realize automatic binding operation by positioning the square head of the ties. One-piece fixing ties are widely used for automobiles, trains, motorcycles and some other transportation means. The one-piece fixing tie is a combination of functions of common ties and an additional head fixing feature, and the fixing feature of the head of the tie is mainly used to be buckled on a vehicle frame or a housing of a household appliance. Common types of head feature of the one-piece fixing ties mainly include: a combination of fir-tree head with butterfly shape, or a combination of fir-tree head with wing shape, a combination of arrow with butterfly shape, or a combination of arrow with wing shape, or a flat-plate type with locking hole, etc. As the one-piece fixing ties have irregular head shapes of various types, most of the one-piece fixing ties are not suitable for feeding by adopting a vibration disc or feeding by adopting a pipe, so that the one-piece fixing tie is relatively difficult to be positioned and fed automatically in an automated tool, and all of the design concepts and methods of various automated tying machines and tools which have come into being are not suitable for automation of the one-piece fixing ties. According to the introduction from transnational companies in large-sized automobile wiring harness industry, for the past thirty years, many well-known automobile manufacturing companies and transnational companies in the automobile wiring harness industry have tried to develop an automated tying tool suitable for one-piece fixing ties by themselves or together with some well-known tool manufacturers, but their efforts have not been successful for over three decades. 
     SUMMARY 
     Objects of the present disclosure include providing an automated tying tool so as to solve the technical problems of great labor intensity and low efficiency of manual tying operation. 
     The present disclosure is mainly designed for automatic binding of loose-packed or interconnected one-piece fixing ties with different head shapes or ties with a label, but the present disclosure is also applicable to automatic binding operation of loose-packed or interconnected common ties with regular head shapes. In order to facilitate the description in the following, ties of different types are generally called as ties. 
     An automated tying tool provided in the present disclosure includes a slider, a guide rail, a first guide claw, a second guide claw, a frame, a tensioning wheel, a cutter, a stepping feeding mechanism and a material pushing rod, wherein the first guide claw and the second guide claw are mounted on the frame via rotation-center pin, the cutter and the tensioning wheel are mounted in the frame, the guide rail is adjacent to the frame, the slider cooperates with the guide rail and slides along a length direction of the guide rail, the first guide claw, the second guide claw, the slider and the guide rail are arranged to have symmetrical center planes located on a center plane of the automated tying tool, the stepping feeding mechanism is mounted on the frame or mounted on a housing of the automated tying tool, the stepping feeding mechanism is capable of loading a tie, and the tie is conveyed, in each binding cycle, to a position, where a symmetrical center plane of the tie is coincident with a center plane of the automated tying tool, according to a fixed interval, the material pushing rod is mounted on the frame or the housing of the automated tying tool, the material pushing rod pushes the tie located on the center plane of the automated tying tool to the slider to be pre-positioned, and the slider drives the tie to slide from the pre-positioning position to a binding operation position. 
     Optionally, the stepping feeding mechanism includes a wheel disc performing an intermittent indexing motion, configured to enable the tie to rotate for indexing feeding; alternatively, the stepping feeding mechanism includes a material shifting pin stepping translationally, configured to enable the tie to step translationally; and alternatively, the stepping feeding mechanism includes a material shifting pin swinging back and forth, configured to enable the tie to swing for stepping transportation. 
     In the above, all of the wheel disc performing an intermittent indexing motion, the material shifting pin stepping translationally and the material shifting pin swinging back and forth are capable of conveying, in each binding cycle, one tie to the position where the symmetrical center plane of the tie is coincident with the center plane of the automated tying tool. 
     Optionally, profiling recesses matching, in shape, with a head portion of the tie are provided on outer circumference of the wheel disc, the number of the profiling recesses is multiple, and all of the profiling recesses are uniformly distributed on the outer circumference of the wheel disc according to a fixed interval. 
     Optionally, the slider and the guide rail are both located inside the circumference of the wheel disc, and the material pushing rod is mounted outside the circumference of the wheel disc, and configured to push the tie towards the slider in a direction approaching to a center of the wheel disc. 
     Alternatively, the slider and the guide rail are both located outside the circumference of the wheel disc, and the material pushing rod is mounted inside the circumference of the wheel disc, and configured to push the tie towards the slider in a direction away from a center of the wheel disc. 
     Optionally, the slider cooperates with the guide rail, and the guide rail is configured to restrict the slider in terms of five spatial degrees of freedom, so that the slider is only capable of sliding on the guide rail. 
     Optionally, the slider is provided thereon with a protruding rib, configured to clamp a head portion of the tie. 
     Alternatively, the slider is provided thereon with a profiling recess matching, in shape, with a head portion of the tie and configured to clamp the head portion of the tie. 
     Optionally, the ties are interconnected ties, the automated tying tool further includes a riving knife configured to separate each tie among the interconnected ties from a tie connecting plate of the interconnected ties, and the riving knife is mounted on the slider, or the riving knife is mounted on the material pushing rod. 
     The riving knife is provided thereon with a protruding rib. 
     Optionally, the riving knife is driven by pneumatic power or electric power. 
     Optionally, the ties are interconnected ties, the wheel disc is provided thereon with a positioning column, the tie connecting plate of the interconnected ties is provided thereon with a positioning hole, and the positioning hole cooperates with the positioning column. 
     Alternatively, the wheel disc is provided thereon with a positioning hole, the tie connecting plate of the interconnected ties is provided thereon with a positioning column, and the positioning column cooperates with the positioning hole. 
     Optionally, the wheel disc is provided thereon with interval pins, the number of the interval pins is multiple, all of the interval pins are uniformly distributed along a circumferential direction of the wheel disc at intervals, the wheel disc is further pivoted with an indexing cam, the indexing cam has a profile abutting against an outer circumferential surface of the interval pins, and is configured to drive the wheel disc to rotate. 
     Alternatively, the wheel disc is provided with interval pins and interval rollers sleeved on the interval pins, all of the interval pins are uniformly distributed along a circumferential direction of the wheel disc at intervals, the wheel disc is further pivoted with an indexing cam, the indexing cam has a profile abutting against an outer circumferential surface of the interval rollers, and the indexing cam is configured to drive the wheel disc to rotate or lock the wheel disc, to realize the intermittent indexing motion of the wheel disc. 
     Alternatively, the circumference of the wheel disc is provided thereon with inner teeth, the gear is engaged with the inner teeth of the wheel disc so as to drive or lock the wheel disc, to realize the intermittent indexing motion of the wheel disc. 
     Alternatively, the circumference of the wheel disc is provided thereon with an outer tooth, the gear is engaged with the outer tooth of the wheel disc so as to drive or lock the wheel disc, to realize the intermittent indexing motion of the wheel disc. 
     Alternatively, the wheel disc is provided with interval pins, the number of the interval pins is multiple, all of the interval pins are distributed along the circumferential direction of the wheel disc at intervals, the automated tying tool further includes an indexing cam pivoted to the frame and a locking block elastically connected to the frame, wherein the indexing cam is configured to stir the interval pins to rotate for feeding, and the locking block tends to be clamped between two adjacent interval pins all the time, so as to lock the wheel disc. 
     Alternatively, ratchets are uniformly distributed on the circumference of the wheel disc, a pawl is provided to drive the wheel disc to rotate, and a locking block is provided to lock the wheel disc, to realize the intermittent indexing motion of the wheel disc. 
     Alternatively, the circumference of the wheel disc is provided thereon with incomplete tooth profiles and inner concave arcs that are uniformly distributed alternately, teeth of an incomplete gear are provided to be engaged with the incomplete tooth profiles of the wheel disc, to drive the wheel disc to rotate, outer convex arcs of the incomplete gear are matched with the inner concave arc of the wheel disc to lock the wheel disc, to realize the intermittent indexing motion of the wheel disc. 
     Alternatively, the wheel disc is provided thereon with radial grooves and inner concave arcs that are uniformly distributed alternately, a driving disc is arranged, shifting pins and outer convex arcs are mounted on the driving disc, the shifting pins on the driving disc is engaged with the grooves of the wheel disc, to drive the wheel disc to rotate, and the outer convex arcs on the driving disc are matched with the inner concave arcs of the wheel disc, to lock the wheel disc, to realize the intermittent indexing motion of the wheel disc. 
     Optionally, the stepping feeding mechanism includes a material shifting pin stepping translationally, the stepping feeding mechanism further includes a material guiding plate, a feeding cylinder and a cylinder of material shifting pin, the material guiding plate is fixedly provided on the frame, and configured to guide the interconnected ties, the feeding cylinder is mounted on the frame, the cylinder of material shifting pin is mounted at a power output end of the feeding cylinder, and the material shifting pin is fixedly provided at the power output end of the cylinder of material shifting pin; 
     the feeding cylinder is configured to linearly advance the cylinder of material shifting pin by one fixed interval, and the cylinder of material shifting pin is configured to insert the material shifting pin into the positioning hole in the tie connecting plate of the interconnected ties, so as to drive the interconnected ties to step translationally. 
     Optionally, the automated tying tool further includes a material pressing assembly configured to press the tie connecting plate on the material guiding plate; and 
     the material pressing assembly is mounted on the frame. 
     Optionally, the material pressing assembly includes a material pressing plate and a material pressing wheel pivoted to the material pressing plate, a spring is connected between the material pressing plate and the frame, and under the effect of the spring, the material pressing wheel presses the tie connecting plate on the material guiding plate, or the material pressing wheel presses the tie connecting plate on the wheel disc. 
     Optionally, the stepping feeding mechanism includes a material shifting pin swinging back and forth, the stepping feeding mechanism further includes a material guiding plate, a swinging bracket and a cylinder of material shifting pin, the material guiding plate is fixedly provided on the frame, and configured to guide the interconnected ties, the swinging bracket is pivoted to the frame, and is capable of swinging back and forth along a material guiding direction, the cylinder of material shifting pin is mounted on the swinging bracket, and the material shifting pin is fixedly provided to a power output end of the cylinder of material shifting pin; and 
     the swinging bracket is configured to swing by one fixed interval, and the cylinder of material shifting pin is configured to insert the material shifting pin into the positioning hole in the tie connecting plate of the interconnected ties, so as to drive the interconnected ties to swing for feeding. 
     Optionally, the stepping feeding mechanism, the first guide claw, the slider, the material pushing rod and the cutter are driven by pneumatic power or electric power. 
     Optionally, the second guide claw is driven by pneumatic power or electric power, or driven by a manual trigger through a connecting rod. 
     Optionally, the automated tying tool further includes a waste box mounted on the frame and configured to collect cut waste. 
     Optionally, a discharging port is provided at a bottom portion of the waste box, a door panel of waste box is arranged at the discharging port, and the door panel of waste box is pivoted to a box body of the waste box through a door panel rotating shaft. 
     Objects of the present disclosure further include providing an automated tying method, so as to solve the technical problem of low efficiency of manual tying operation. 
     The automated tying method provided in the present disclosure is used to bind loose-packed ties, and includes following steps: 
     S1: placing a tie on a stepping feeding mechanism, which acts to convey the tie to a position where a symmetrical center plane of the tie is coplanar with a center plane of the automated tying tool; 
     S2: enabling a material pushing rod to act to push the tie onto the slider to be pre-positioned; 
     S3: enabling the slider to move to drive the tie to slide from the pre-positioning position in the step S2 to a binding operation position, wherein in a sliding process of the slider, a tie body of the tie is curled in guide slots in a first guide claw and a second guide claw, and enabling the first guide claw to rotate to make a tail portion of the tie pass through a hole on a head portion of the tie; 
     S4: enabling a tensioning wheel to rotate to tighten the tie, and cutting off the tensioned tie with a cutter; and 
     S5: allowing a head portion of the tie to exit from the slider, wherein the slider returns back along the guide rail from the binding position to the pre-positioning position. 
     Objects of the present disclosure further include providing another automated tying method, so as to solve the technical problems of low efficiency of manual tying operation and inconvenient binding of interconnected ties. 
     The automated tying method provided in the present disclosure is used to bind interconnected ties, and includes following steps: 
     S10: placing a tie on a stepping feeding mechanism, which acts to convey the tie to a position where a symmetrical center plane of the tie is coplanar with a center plane of the automated tying tool; 
     S20: enabling the riving knife to act to separate the tie moving in place in step S10 from a tie connecting plate of the interconnected ties; 
     S30: enabling the material pushing rod to act to push the tie separated from the tie connecting plate in the step S20 onto the slider to be pre-positioned; 
     S40: enabling the slider to move to drive the tie to slide from the pre-positioning position in the step S30 to a binding operation position, wherein in sliding process of the slider, a tie body of the tie is curled in guide slots in first guide claw and the second guide claw, and enabling the first guide claw to rotate to make the tail portion of the tie pass through a hole on the head portion of the tie; 
     S50: enabling a tensioning wheel to rotate to tighten the tie, and cutting off the tensioned tie with a cutter; and 
     S60: allowing a head portion of the tie to exit from the slider, wherein slider returns back along the guide rail from the binding position to the pre-positioning position. 
     Beneficial effects of the present disclosure are as follows: 
     By providing the automated tying tool, during the binding operation, the ties are placed on the stepping feeding mechanism, and using the intermittent feeding characteristic of the stepping feeding mechanism, the ties are conveyed one by one to the position where the symmetrical center plane of the tie is coplanar with a center plane of the automated tying tool; then the material pushing rod acts to push the tie onto the slider to be pre-positioned; subsequently, the slider moves to drive the tie to slide from the pre-positioning position to the binding operation position, wherein in the sliding process of the slider, the tie body of the tie is curled in the guide slots in the first guide claw and the second guide claw, and the first guide claw rotates to make the tail portion of the tie pass through the hole on the head portion of the tie; finally, the tensioning wheel rotates to tighten the tie, and the tensioned tie is cut off with the cutter. When the interconnected ties need to be used for the binding operation, the riving knife also can be provided in the automated tying tool, so as to separate the tie from the tie connecting plate before the material pushing rod acts, and further subsequent binding operation is realized. 
     Objects of the present disclosure further include providing a material feeding, separating and pushing mechanism of a tying tool, so as to solve the technical problems of low efficiency of manual tying operation and inconvenient binding of interconnected ties. 
     The material feeding, separating and pushing mechanism of a tying tool provided in the present disclosure includes an intermittent indexing mechanism, a material separating mechanism, a material pushing mechanism, and a slider mechanism; sequentially, the intermittent indexing mechanism conveys one tie to an operation position of the material separating mechanism each time, the material separating mechanism separates the tie from the tie connecting plate of the interconnected ties, the material pushing mechanism pushes the separated tie into the slider to be positioned; the slider mechanism slides the tie from the pre-positioning position to the binding operation position; all of the intermittent indexing mechanism, the material separating mechanism, the material pushing mechanism, and the slider mechanism are driven by electric power, controlled by a controller to act in sequence according to temporal logic, and the intermittent indexing mechanism, the material separating mechanism, and the material pushing mechanism are driven by a motor to act according to a time sequence. 
     The material feeding, separating and pushing mechanism of a tying tool, the automated tying tool and the automated tying method provided in the present disclosure realize the automatic binding, overcome the drawback of great labor intensity and low binding efficiency of the manual binding operation, moreover, the automated tying tool not only is applicable to automatic binding operation of loose-packed or interconnected one-piece fixing ties with irregular head shapes, but also is applicable to automatic binding operation of loose-packed or interconnected common nylon ties with a regular head shape, thus having relatively high degree of universalization, and bringing great convenience to the binding operation. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is an isometric diagram of an automated tying tool provided in an embodiment of the present disclosure when being applied to interconnected ties; 
         FIG.  2    is an isometric diagram of an automated tying tool provided in an embodiment of the present disclosure when being applied to loose-packed or interconnected ties; 
         FIG.  3    is an isometric diagram of an automated tying tool provided in an embodiment of the present disclosure when being applied to interconnected ties, wherein there are ties, a material pressing plate is opened, a slider and a guide rail are located inside the circumference of a wheel disc, and a material pushing rod is located above the wheel disc; 
         FIG.  4    is an isometric diagram of an automated tying tool provided in an embodiment of the present disclosure when being applied to interconnected ties, wherein there are ties, a material pressing plate is pressed down, a slider and a guide rail are located inside the circumference of a wheel disc, and a material pushing rod is located above the wheel disc; 
         FIG.  5    is an isometric diagram of an automated tying tool provided in an embodiment of the present disclosure when being applied to loose-packed or interconnected ties, wherein there are ties, a wheel disc is located above a slider and a guide rail, and a material pushing rod is located inside circumference of the wheel disc; 
         FIG.  6    is a top view corresponding to  FIG.  7   ; 
         FIG.  7    is a front view of an automated tying tool provided in the present disclosure, wherein a wheel disc is adopted as a stepping feeding mechanism, a slider and a guide rail are located inside circumference of the wheel disc, and the material pushing rod is located above the wheel disc; 
         FIG.  8    is a top view corresponding to  FIG.  9   ; 
         FIG.  9    is a front view of an automated tying tool provided in the present disclosure, wherein a wheel disc is adopted as a stepping feeding mechanism, a slider and a guide rail are located inside circumference of the wheel disc, the material pushing rod is located above the wheel disc, and there are ties; 
         FIG.  10    is a sectional view taken along line A-A corresponding to  FIG.  8   ; 
         FIG.  11    is a sectional view taken along line B-B corresponding to  FIG.  10   , wherein a gear drives the wheel disc to perform an intermittent indexing motion; 
         FIG.  12    is a sectional view taken along line A-A corresponding to  FIG.  8   , wherein a riving knife separates the tie from a connecting plate; 
         FIG.  13    is a sectional view taken along line A-A corresponding to  FIG.  8   , wherein the material pushing rod pushes the tie into the slider, and the riving knife retracts; 
         FIG.  14    is a sectional view taken along line A-A corresponding to  FIG.  8   , wherein the slider pushes the tie into guide slots in a first guide claw and a second guide claw; 
         FIG.  15    is a sectional view taken along line A-A corresponding to  FIG.  8   , wherein the first guide claw hooks to insert a tail portion of the tie into a hole on a head portion of the tie; 
         FIG.  16    is a sectional view taken along line A-A corresponding to  FIG.  8   , wherein a cutter cuts off the tensioned tie, the second guide claw is opened, and the tie is to exit from the slider; 
         FIG.  17    is a sectional view taken along line A-A corresponding to  FIG.  8   , wherein the riving knife is driven through a combination of a toggle mechanism and a cylinder; 
         FIG.  18    is an enlarged sectional view taken along line C-C corresponding to  FIG.  15   , wherein an indexing cam drives the wheel disc to rotate; 
         FIG.  19    is an enlarged sectional view taken along line D-D corresponding to  FIG.  16   , wherein the indexing cam locks the wheel disc; 
         FIG.  20    is an enlarged sectional view taken along line D-D corresponding to  FIG.  16   , wherein the indexing cam drives the wheel disc to rotate; 
         FIG.  21    is a top view corresponding to  FIG.  22   ; 
         FIG.  22    is a front view of an automated tying tool provided in an embodiment of the present disclosure, wherein a wheel disc is located above a slider and a guide rail, and a material pushing rod is located inside circumference of the wheel disc; 
         FIG.  23    is a sectional view taken along line E-E corresponding to  FIG.  21   , wherein the material pushing rod is located inside the circumference of the wheel disc; 
         FIG.  24    is an isometric diagram of an automated tying tool provided in an embodiment of the present disclosure when being applied to interconnected ties, wherein a feeding mechanism stepping translationally is adopted; 
         FIG.  25    is a top view corresponding to  FIG.  26   , wherein a feeding mechanism stepping translationally is adopted, which is applied to interconnected ties; 
         FIG.  26    is a front view of an automated tying tool provided in an embodiment of the present disclosure, which is corresponding to a sectional view taken along line F-F in  FIG.  25   ; 
         FIG.  27    is a sectional view taken along line G-G corresponding to  FIG.  26   , wherein a feeding mechanism stepping translationally is adopted, and a material shifting pin is in a retraction state; 
         FIG.  28    is a sectional view taken along line G-G corresponding to  FIG.  26   , wherein a feeding mechanism stepping translationally is adopted, and a material shifting pin is inserted into a positioning hole on a connecting plate of the interconnected ties; 
         FIG.  29    is a sectional view taken along line G-G corresponding to  FIG.  26   , wherein a feeding mechanism stepping translationally is adopted, and a material shifting pin makes the interconnected ties move one interval; 
         FIG.  30    is a front view of an automated tying tool provided in an embodiment of the present disclosure, wherein the material shifting pin swinging back and forth is adopted for feeding; 
         FIG.  31    is a sectional view taken along line H-H corresponding to  FIG.  30   , wherein the material shifting pin is to push the interconnected ties; 
         FIG.  32    is a sectional view taken along line H-H corresponding to  FIG.  30   , wherein the material shifting pin makes the interconnected ties move one interval; 
         FIG.  33    is an isometric diagram of an all-electric automated tying tool provided in an embodiment of the present disclosure, which is applied to interconnected ties; 
         FIG.  34    is a front view of an all-electric automated tying tool provided in an embodiment of the present disclosure; 
         FIG.  35    is a top view corresponding to  FIG.  34   ; 
         FIG.  36    is an isometric diagram of an all-electric automated tying tool provided in an embodiment of the present disclosure, with a shell being removed; 
         FIG.  37    is an isometric diagram of an all-electric automated tying tool provided in an embodiment of the present disclosure, with a shell, a guide claw, and a tensioning wheel mechanism being removed, and mainly showing the linkage action of the indexing of the wheel disc, the riving knife, and the material pushing rod; 
         FIG.  38    is a sectional view taken along line T-T corresponding to  FIG.  35   , wherein the wheel disc has just finished an indexing action, and a cam of riving knife is to act on a connecting rod of an ejector pin of the riving knife; 
         FIG.  39    is a sectional view taken along line T-T corresponding to  FIG.  35   , wherein the cam of riving knife is to act on a connecting rod of an ejector pin of the riving knife, an ejector pin of the riving knife pushes the riving knife upwards, and the riving knife separates the tie from a tie connecting plate; 
         FIG.  40    is a sectional view taken along line T-T corresponding to  FIG.  35   , wherein a cam of material pushing rod is to act on a connecting rod of the material pushing rod, the material pushing rod pushes the tie and the riving knife downwards, and the tie is positioned inside the slider; 
         FIG.  41    is a right view corresponding to  FIG.  38   ,  FIG.  39   , and  FIG.  40   ; 
         FIG.  42    is an isometric diagram of assembling of guide rail, the slider and riving knife provided in an embodiment of the present disclosure, a part of protruding ribs on the slider are formed integratedly with the riving knife, and the riving knife can slide up and down in the guide rail according to a direction of arrow in the figure; 
         FIG.  43    is a rear view with reference to  FIG.  34   , with a shell, a guide claw, and a tensioning wheel mechanism being removed, and mainly showing the linkage action mechanism of the indexing of the wheel disc, the riving knife, and the material pushing rod, wherein the slider is located in a pre-positioning position of the tie; 
         FIG.  44    is a rear view with reference to  FIG.  34   , with a shell, a guide claw, and a tensioning wheel mechanism being removed, and mainly showing the linkage action mechanism of the indexing of the wheel disc, the riving knife, and the material pushing rod, wherein the slider together with the tie is sent to a binding position; 
         FIG.  45    is a sectional view taken along line T-T corresponding to  FIG.  35   , wherein the material pushing rod retracts to an upper end, and the tie is positioned inside the slider; 
         FIG.  46    is a bottom view corresponding to  FIG.  45   ; 
         FIG.  47    is a sectional view taken along line T-T corresponding to  FIG.  35   , wherein the second guide claw is closed, and the slider (together with the tie) is sent to a binding operation position; 
         FIG.  48    is a sectional view taken along line T-T corresponding to  FIG.  35   , wherein the first guide claw swings inwards to insert a tail portion of the tie into a hole on a head portion of the tie; 
         FIG.  49    is a sectional view taken along line T-T corresponding to  FIG.  35   , wherein the tensioning wheel driven by a motor tightens the tie, the cutter driven by the motor cuts off the tie, and the second guide claw is opened to allow the head portion of the tie to exit from the slider; 
         FIG.  50    is a rear view with reference to  FIG.  34   , with the shell being removed, showing that the second guide claw is connected by a trigger through a connecting rod mechanism, the second guide claw is in an open state, and the slider is located in the pre-positioning position of the tie, and also showing that the tensioning wheel performs the transmission by the motor; 
         FIG.  51    is a rear view with reference to  FIG.  34   , with the shell being removed, and showing that the second guide claw is driven to close by a trigger through a connecting rod, the slider sends the tie to a binding position, and the tensioning wheel is driven by the motor; 
         FIG.  52    is a rear view with reference to  FIG.  34   , with the shell being removed, and showing that the second guide claw is driven to close by a trigger through a connecting rod, the slider sends the tie to a binding position, the first guide claw is driven by the cam to hook inwards, and the tensioning wheel performs the transmission by the motor; 
         FIG.  53    is a rear view with reference to  FIG.  34   , with the shell being removed, and showing that the second guide claw is driven by a cam, the second guide claw is in an open state, and the slider is located in a pre-positioning position of the tie; 
         FIG.  54    is a rear view with reference to  FIG.  34   , with the shell being removed, and showing that the second guide claw is driven by a cam, the second guide claw is in a closed state, and the slider sends the tie to a binding position; 
         FIG.  55    shows an alternative solution of an intermittent indexing mechanism shown in  FIG.  37    and  FIG.  41   , wherein the cam stirs an interval roller, and a locking block locks the wheel disc; 
         FIG.  56    shows an alternative solution of the intermittent indexing mechanism shown in  FIG.  37    and  FIG.  41   , wherein the wheel disc is driven or locked by an incomplete gear; and 
         FIG.  57    is an isometric diagram showing one-piece fixing ties with irregular head shapes such as aircraft head, mushroom head, and fir-tree head, a tie with a label, and a common tie with regular head shape. 
     
    
    
     In the above,  FIG.  1   - FIG.  32    mainly show the design solution in which the slider, the first guide claw, the second guide claw, the tensioning wheel, the cutter, the stepping feeding mechanism, the riving knife and the material pushing rod are driven electrically or pneumatically; and  FIG.  33   - FIG.  56    mainly show the design solution in which the slider, the first guide claw, the second guide claw, the tensioning wheel, the cutter, the stepping feeding mechanism (intermittent indexing mechanism), the riving knife and the material pushing rod are driven in an all-electric manner. 
     In the drawings, the A-A section, E-E section, F-F section, and G-G section are center planes of the automated tying tool; and in the drawings, the A-A section, E-E section, F-F section, and G-G section are also symmetrical center planes of the tie that has been pre-positioned. 
     Reference signs:  000 . controller;  001 . wire;  1 . slider;  101 . slider cylinder;  102 . cylinder fixing frame;  103 . connecting sleeve;  104 . protruding rib;  100 . motor;  11 . trigger;  110 . reduction gearbox;  111 . swinging arm;  112 . pin shaft;  113 . connecting rod;  114 . pin shaft;  117 . trigger reset spring;  118 . trigger center shaft;  119 . reset spring;  2 . guide rail;  20 . tie;  201 . head portion of tie;  202 . tie connecting plate;  203 . positioning hole;  3 . first guide claw;  31 . center shaft of first guide claw;  32 . pin shaft;  33 . connecting rod;  34 . center shaft of connecting rod;  35 . pin shaft;  36 . driven connecting rod;  37 . center shaft of driven connecting rod;  38 . cam of first guide claw;  30 . riving knife;  301 . cylinder of riving knife;  302 . ejector pin of riving knife;  303 . toggle mechanism;  304 . pin shaft;  305 . connecting rod of ejector pin of riving knife;  307 . cam roller;  308 . cam of riving knife;  309 . reset spring of ejector pin of riving knife;  31 . rotating shaft of first guide claw;  4 . second guide claw;  41 . center shaft of second guide claw;  42 . pin shaft;  43 . connecting rod of second guide claw;  44 . center shaft of connecting rod;  45 . pin shaft;  46 . roller;  47 . cam of second guide claw;  5 . frame;  501 . material pressing plate;  502 . material pressing wheel;  503 . shaft of material pressing wheel;  6 . tensioning wheel;  600 . motor;  610 . reduction gearbox;  620 . period control gear;  621 . sensing portion;  622 . sensor;  630 . tensioning gear;  7 . cutter;  8 . stepping feeding mechanism;  800 . motor;  801 . wheel disc;  802 . positioning column;  803 . interval roller;  804 . indexing cam;  805 . cam shaft;  806 . centering wheel;  807 . profiling recess;  808 . interval pin;  809 . locking block;  810 . incomplete gear;  811 . gear;  812 . gear shaft;  813 . gear box;  820 . gear;  814 . pin shaft;  815 . spring;  821 . material guiding plate;  822 . feeding cylinder bracket;  823 . feeding cylinder;  824 . material shifting cylinder bracket;  825 . cylinder of material shifting pin;  826 . material shifting pin;  834 . swinging bracket;  837 . rotating shaft of swinging bracket;  9 . material pushing rod;  901 . material pushing cylinder;  902 . material pushing cylinder bracket;  903 . pin shaft;  904 . connecting rod of material pushing rod;  905 . center shaft of connecting rod;  906 . cam roller;  907 . cam shaft;  908 . cam of material pushing rod;  909 . reset spring of material pushing rod;  10 . housing;  12 . waste box;  121 . door panel of waste box;  122 . rotating shaft of door panel. 
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Below the present disclosure is further described in combination with accompanying drawings and specific embodiments. 
     As shown in  FIG.  1   ,  FIG.  3   ,  FIG.  4   ,  FIG.  6   ,  FIG.  7   ,  FIG.  8   ,  FIG.  9   ,  FIG.  10   ,  FIG.  11   ,  FIG.  12   ,  FIG.  13   ,  FIG.  14   ,  FIG.  15   ,  FIG.  16   ,  FIG.  17   ,  FIG.  18   ,  FIG.  19    and  FIG.  20   , the present embodiment provides an automated tying tool, including: a slider  1 , a guide rail  2 , a first guide claw  3 , a second guide claw  4 , a frame  5 , a tensioning wheel  6 , a cutter  7 , a stepping feeding mechanism  8  and a material pushing rod  9 , wherein the first guide claw  3  and the second guide claw  4  are mounted on the frame  5  via rotation-center pin, the cutter  7  and the tensioning wheel  6  are mounted in the frame  5 , the guide rail  2  is tightly fixed on the frame  5 , the slider  1  cooperates with the guide rail  2  and slides along a length direction of the guide rail  2 , except for sliding along the length direction of the guide rail  2 , other five spatial degrees of freedom of the slider  1  are limited by the guide rail  2 , and symmetrical center planes of the first guide claw  3 , the second guide claw  4 , the slider  1  and the guide rail  2  are in coplanar arrangement with the center plane of the automated tying tool, wherein the A-A section shown in  FIG.  8    and the F-F section shown in  FIG.  25    are center planes of the automated tying tool. 
     As shown in  FIG.  10   ,  FIG.  12   ,  FIG.  13   ,  FIG.  14   ,  FIG.  15   , and  FIG.  16   , a cylinder fixing frame  102  is mounted on the frame  5 , a cylinder barrel of the slider cylinder  101  is mounted on the cylinder fixing frame  102 , a piston rod of the slider cylinder  101  is connected to the slider  1  through a connecting sleeve  103 , the slider cylinder  101  drives the slider  1  to slide on the guide rail  2 , the slider  1  is provided thereon with a guide slot in a vertical direction, a riving knife  30  is mounted on the slider  1  and can slide in the guide slot in the vertical direction of the slider  1 , that is, the riving knife  30  slides up and down in the slider  1 , and the riving knife  30  slides along the length direction of the guide rail  2  along with the slider  1 ; the cylinder of riving knife  301  is mounted on the cylinder fixing frame  102  through the cylinder barrel thereof, an action rod of the cylinder of riving knife  301  serves as an ejector pin of riving knife  302 , and when extending out, a piston rod of the cylinder of riving knife  301  pushes the riving knife  30  upwards to separate the tie  20  from the tie connecting plate  202 , so as to realize material separating. (Or the riving knife  30  is mounted on the material pushing rod  9  and slides up and down along with the material pushing rod  9 ; and for loose-packed ties, no riving knife  30  needs to be mounted). 
     Please continue to refer to  FIG.  1   ,  FIG.  3   ,  FIG.  4    and  FIG.  6    to  FIG.  20   , specifically, the stepping feeding mechanism  8  is a wheel disc  801  capable of performing an intermittent indexing motion, the wheel disc  801  is mounted on the frame  5  or mounted on a housing  10  of the automated tying tool through at least three centering wheels  806  or bearings, profiling recesses  807  matching with the shape of a head portion of the tie  20  are uniformly distributed on circumference of the wheel disc  801 , and each profiling recess  807  is loaded with one tie. When ties for binding are interconnected ties, the wheel disc  801  is provided thereon with a positioning column  802 , and meanwhile, the tie connecting plate  202  of the interconnected ties is provided with a positioning hole  203 , wherein the positioning hole  203  cooperates with the positioning column  802 , so that the positioning column  802  can be inserted into the positioning hole  203 . A material pressing plate  501  and a material pressing wheel  502  press the tie connecting plate  202  of the interconnected ties on a material guiding plate  821  under the action of a spring (the spring is not shown), the wheel disc  801  conveys one tie  20  to a position, where the symmetrical center plane of the tie and the center plane of the automated tying tool are coplanar, according to a fixed interval in each binding cycle, the ejector pin of riving knife  302  pushes out the riving knife  30  under the action of the cylinder of riving knife  301 , the riving knife  30  separates the tie  20  from the tie connecting plate  202 , the material pushing rod  9  is fixedly mounted at an end portion of an action rod of a material pushing cylinder  901 , a cylinder barrel of the material pushing cylinder  901  is mounted on a material pushing cylinder bracket  902 , the material pushing cylinder bracket  902  is fixedly mounted on the frame  5  or the housing  10 , the slider  1  cooperates with the guide rail  2 , the guide rail  2  limits five spatial degrees of freedom of the slider  1 , the slider  1  can only slide on the guide rail  2 , and a protruding rib  104  is designed on the slider  1  for clamping the head portion of the tie  20 ; and the material pushing rod  9  pushes the separated head portion of tie  201  onto the slider  1  to be pre-positioned. 
     Please continue to refer to  FIG.  13   - FIG.  17   , after the head portion of tie  201  is pushed onto the slider  1  to be pre-positioned, the material pushing rod  9  is retracted upwards to an upper end point, the slider  1  driven by the slider cylinder  101  drives the tie  20  to slide from a right end to a left end of the guide rail  2 , that is, to slide from the pre-positioning position to a binding position of the tie  20 . In the sliding process of the slider  1 , a tie body of the tie  20  is curled in the guide slots in the first guide claw  3  and the second guide claw  4 , the first guide claw  3  rotates around a rotating shaft of the first guide claw  31  to make the tail portion of the tie  20  pass through a hole in the head portion of tie  201 , the tensioning wheel  6  rotates to tighten the tie  20 , the cutter  7  cuts off the tightened tie  20 , and after the head portion of the tie  20  exits from the slider  1 , the slider  1  is retracted to the pre-positioning position of the tie to prepare for the next binding cycle. 
     It needs to be noted that in the present embodiment, the automated tying tool may be in the above structural form in which the positioning column  802  is provided on the wheel disc  801  and the positioning hole  203  is provided on the tie connecting plate  202 , but is not limited thereto, while other arrangement forms may also be adopted, for example, the positioning hole is provided on the wheel disc  801  and the positioning column is provided on the tie connecting plate  202 , as long as the tie connecting plate  202  can be positioned on the wheel disc  801  through such an arrangement form. 
     It further should be noted that in the present embodiment, “symmetrical center planes of the first guide claw  3 , the second guide claw  4 , the slider  1  and guide rail  2  are coplanarly or coincidently arranged on the center plane of the automated tying tool” means that the symmetrical center planes of the first guide claw  3 , the second guide claw  4 , the slider  1  and the guide rail  2  are arranged coincidently, and the coincident plane is superposed with the center plane of the automated tying tool (the A-A section in  FIG.  8    and the F-F section in  FIG.  25    are the center plane of the automated tying tool), that is to say, when slider  1  drives the tie  20  to slide from right to left, when moving to the position of the first guide claw  3 , the tie  20  can curl in accordance with the radian of a bottom surface of the guide slot of the first guide claw  3 , and when moving continuously, the tie  20  can curl in accordance with the radian of a bottom surface of the guide slot of the second guide claw  4 , and finally, the binding operation is realized. 
     In addition, in the present embodiment, it may be the above-mentioned structural form that the protruding rib is provided on the slider  1  so as to position the head portion of the tie  20 , but is not limited to this, while other arrangement forms may also be adopted, for example, a profiling recess  807  matching with the shape of the head portion of the tie  20  is provided on the slider  1 , as long as the head portion of the tie  20  can be positioned through such structural form. 
     Please continue to refer to  FIG.  17   , in the present embodiment, a toggle mechanism  303  further can be arranged between the piston rod of the cylinder of riving knife  301  and the riving knife  30 . With such arrangement, the cutting force of the riving knife  30  is increased, so that each tie  20  among the interconnected ties can be reliably and quickly cut off from the tie connecting plate  202 , thereby improving the working reliability of the automated tying tool of the present embodiment. 
     Please continue to refer to  FIG.  17   , in the present embodiment, the cylinder of riving knife  301  is arranged horizontally, and the toggle mechanism  303  is connected between the piston rod of the cylinder of riving knife  301  and the ejector pin of riving knife  302 , wherein the piston rod extends out and retracts in the horizontal direction, and the ejector pin of riving knife  302  moves in the vertical direction. Such arrangement greatly reduces the longitudinal space occupation of the housing  10 , so that the entire structure of the automated tying tool is more compact. 
     Please continue to refer to  FIG.  10    and  FIG.  11   , in the present embodiment, the wheel disc  801  is provided with internal teeth or external teeth, so that the wheel disc  801  can be driven by the gear  811  to perform the intermittent indexing motion. 
     It should be noted that in the present embodiment, the intermittent indexing motion of the wheel disc  801  can be driven by the above-mentioned gear mechanism, but it is not limited thereto, while other arrangement forms also can be adopted, specifically as shown in  FIG.  15   ,  FIG.  16   ,  FIG.  18   ,  FIG.  19    and  FIG.  20   . Specifically, the wheel disc  801  is driven by an indexing cam  804  so as to perform the intermittent indexing motion, in  FIG.  18    and  FIG.  20   , the indexing cam  804  is sleeved on a cam shaft  805 , the cam shaft  805  transmits power to the indexing cam  804 , a rising edge of profile of the indexing cam  804  is in contact with one interval roller  803  fixed on the wheel disc  801 , at this time, the indexing cam  804  rotates to drive the wheel disc  801  to rotate, and in  FIG.  19   , an equal-radius edge of the profile of the indexing cam  804  is in contact with two interval rollers  803  fixed on the wheel disc  801 , at this time, the wheel disc  801  stops and is in a locked state. The direction of rotation of the wheel disc  801  and the indexing cam  804  is shown by arrows in  FIG.  18   ,  FIG.  19    and  FIG.  20   , and the indexing cam  804  is a double acting cam. 
     It further should be noted that in the present embodiment, it may be the structural form in which the above slider  1  and the guide rail  2  are located inside the circumference of the wheel disc  801  and the material pushing rod  9  is located outside the circumference of the wheel disc  801 , but it is not limited thereto, while other forms also can be adopted, specifically as shown in  FIG.  2   ,  FIG.  5   ,  FIG.  21   ,  FIG.  22   , and  FIG.  23   . Specifically, the slider  1  and the guide rail  2  are located outside the circumference of the wheel disc  801 , and the material pushing rod  9  is located inside the circumference of the wheel disc  801 . Moreover, a plurality of profiling recesses  807  matching with the shape of the head portion of tie  201  are uniformly distributed on an outer circumferential surface of the wheel disc  801 , each profiling recess  807  is loaded with one tie  20 , the wheel disc  801  rotates by one fixed interval each time, and the material pushing rod  9  pushes the head portion of tie  201  to the slider  1  to be pre-positioned. 
     In the present embodiment, when such structural form of the automated tying tool for realizing automatic binding of the tie  20 , using the wheel disc  801  performing the intermittent indexing motion, is used for loose-packed ties, the wheel disc  801  is equivalent to a “cartridge holder”, and an operator can manually load materials to assemble the loose-packed ties one by one onto the wheel disc  801 , which is quite convenient. 
     It should be noted that in the present embodiment, the automated tying tool can realize a stepping feeding action of the tie  20  using the above wheel disc  801  performing the intermittent indexing motion, but it is not limited thereto, while other arrangement forms also can be adopted, specifically referring to  FIG.  24   - FIG.  29   . Specifically, the stepping feeding mechanism  8  includes a material shifting pin  826  performing a translationally stepping motion, a material guiding plate  821 , a feeding cylinder  823 , a feeding cylinder bracket  822  and a cylinder of material shifting pin  825 . In the above, the material guiding plate  821  is fixedly provided on the frame  5 , for guiding the feeding of the interconnected ties, the feeding cylinder  823  is mounted on the frame  5 , the cylinder of material shifting pin  825  is mounted at a power output end of the feeding cylinder  823 , and the material shifting pin  826  is fixedly provided at a power output end of the cylinder of material shifting pin  825 . Moreover, the feeding cylinder  823  is configured to linearly advance the cylinder of material shifting pin  825  by one fixed interval, and the cylinder of material shifting pin  825  is configured to insert the material shifting pin  826  into the positioning hole on the tie connecting plate  202  of the interconnected ties, so as to drive the interconnected ties to step translationally. 
     Such form of realizing the forward feeding of the interconnected ties in a translationally stepping manner is simple in structure and relatively low in configuration cost. Moreover, the pneumatic driving manner substantially will produce no environmental pollution. 
     Please continue to refer to  FIG.  24   - FIG.  29   , in the present embodiment, the automated tying tool further may include a material pressing assembly for pressing the tie connecting plate  202  on the material guiding plate  821 . In the above, the material pressing assembly is mounted on the frame  5 . Specifically, the material pressing assembly includes a material pressing plate  501  and a material pressing wheel  502  pivoted to the material pressing plate  501 , wherein a spring is connected between the material pressing plate  501  and the frame  5 , and under the effect of the spring, the material pressing wheel  502  can press the tie connecting plate  202  on the material guiding plate  821 . 
     An operating process of such automated tying tool adopting the translationally stepping manner is as follows: in an initial state, the material pressing plate  501  and the material pressing wheel  502  press, under the effect of the spring, the tie connecting plate  202  of the interconnected ties on the material guiding plate  821 ; then the cylinder of material shifting pin  825  is pushed out, to insert the material shifting pin  826  into the positioning hole on the interconnected tie connecting plate  202 , moreover, the stroke of the feeding cylinder  823  is equal to the interval of the interconnected ties, and the feeding cylinder  823  is linearly pushed out to advance the interconnected ties by one interval; after one time of material feeding is completed, the cylinder of material shifting pin  825  drives the material shifting pin  826  to retract, and the feeding cylinder  823  drives the cylinder of material shifting pin  825  and the material shifting pin  826  to retract to prepare for feeding of next time. 
     Please continue to refer to  FIG.  24   - FIG.  29   , in the present embodiment, the cylinder of material shifting pin  825  is fixedly provided on a piston rod of the feeding cylinder  823  through a material shifting cylinder bracket  824 . 
     Besides, in the present embodiment, apart from using the above wheel disc  801  performing the intermittent indexing motion and the material shifting pin  826  performing the translationally stepping motion, the automated tying tool also can adopt other forms to realize the stepping feeding action of the tie  20 , specifically referring to  FIG.  30   ,  FIG.  31    and  FIG.  32   . Specifically, the stepping feeding mechanism  8  includes the material shifting pin  826  swinging back and forth, and the material guiding plate  821 , a swinging bracket  834 , a rotating shaft of swinging bracket  837  and the cylinder of material shifting pin  825 , wherein the swinging bracket  834  is pivoted to the frame  5  through the rotating shaft of swinging bracket  837 , and can swing back and forth along a material guiding direction, the cylinder of material shifting pin  825  is mounted on the swinging bracket  834 , and the material shifting pin  826  is fixedly provided to the piston rod of the cylinder of material shifting pin  825 . 
     Please continue to refer to  FIG.  30   - FIG.  32   , such automated tying tool feeding in a swinging manner also includes the above-mentioned material pressing assembly, and the material pressing principle and the material pressing process are similar, and will not be described redundantly herein. 
     An operating process of such automated tying tool adopting the swinging stepping manner is as follows: in an initial state, the material pressing plate  501  and the material pressing wheel  502  press, under the action of the spring, the tie connecting plate  202  of the interconnected ties on the material guiding plate  821 ; then the piston rod of the cylinder of material shifting pin  825  extends out, to insert the material shifting pin  826  into the positioning hole on the tie connecting plate  202  of the interconnected ties; subsequently, the swinging bracket  834  swings, to advance the interconnected ties by one interval, so as to realize the feeding. After one time of feeding is completed, the cylinder of material shifting pin  825  drives the material shifting pin  826  to retract, and the swinging bracket  834  drives the cylinder of material shifting pin  825  and the material shifting pin  826  to retract to prepare for the feeding of next time. 
     In the present embodiment, the stepping feeding mechanism  8  not only can be driven by electric power, but also can be driven by pneumatic power, and also can be driven by a combined power of electric power and pneumatic power. 
     Besides, in the present embodiment, the first guide claw  3 , the slider  1 , the material pushing rod  9 , the cutter  7  and the riving knife  30  not only can be driven by electric power, but also can be driven by pneumatic power, and also can be driven by a combined power of electric power and pneumatic power. 
     Please continue to refer to  FIG.  23   , in the present embodiment, the second guide claw  4  can be driven by pneumatic power, and also can be driven by electric power, and further a connecting rod can be provided between the second guide claw  4  and the trigger  11 , so as to drive the connecting rod by manually operating the trigger  11 , to realize rotation of the second guide claw  4  around the rotation shaft of second guide claw  41 . In the above, the trigger  11  rotates around a trigger center shaft  118 . 
     Please continue to refer to  FIG.  23   , in the present embodiment, the automated tying tool further may include a waste box  12  mounted on the frame  5 , wherein the waste box  12  is used to collect the cut waste. By means of such configuration, the cut waste is effectively collected, thus the environmental pollution caused by the waste is reduced, and meanwhile, personal damage risk caused by sputtering of the waste is also reduced, then the safety is greatly improved. 
     Specifically, the waste box  12  is arranged below the tensioning wheel  6 , and is communicated with a channel on the frame  5  for extending out the tail portion of the tie  20 . Moreover, a discharging port is provided at a bottom portion of the waste box  12 , a door panel of waste box  121  is arranged at the discharging port, and the door panel of waste box  121  is pivoted to a box body of the waste box  12  through a rotating shaft of door panel  122 . 
     After the automated tying tool works for a period of time, the door panel of waste box  121  can be rotated to open, so that centralized treatment on the waste material in the waste box  12  is realized. 
     The automated tying tool realizes automatic binding of one-piece fixing ties with irregular head shapes. Moreover, as shown in  FIG.  1   , when a common tie needs to be used to realize automatic binding operation, the protruding rib  104  or the profiling recess  807  of the slider  1  and the profiling recess  807  on the wheel disc  801  can be made into shapes matching with the head portion of the common tie, at this time, the automated tying tool can be suitable for automatic binding of the common tie with a regular head shape. 
     In the present embodiment, the tie  20  may be a nylon tie. 
     In addition, the present embodiment further provides an automatic tying method, and when binding loose-packed ties, this automatic tying method includes following steps: 
     S1: placing a tie  20  on a stepping feeding mechanism  8 , which performs an intermittent indexing motion and rotates by one interval, to convey the tie  20  to a position where a symmetrical center plane of the tie  20  is coincident with a center plane of the automated tying tool; 
     S2: enabling a material pushing rod  9  to act to push the tie  20  onto the slider  1  to be pre-positioned; 
     S3: enabling the slider  1  to move to drive the tie  20  to slide from the pre-positioning position in the step S2 to a binding operation position, wherein in a sliding process of the slider  1 , a tie body of the tie  20  is curled in the guide slots in a first guide claw  3  and a second guide claw  4 , and enabling the first guide claw  3  to rotate to make a tail portion of the tie pass through a hole on a head portion of tie  201 ; 
     S4: enabling a tensioning wheel  6  to rotate to tighten the tie  20 , and cutting off the tensioned tie  20  with a cutter  7 ; and 
     S5: allowing the bound tie head to exit from the slider  1 , wherein the slider  1  returns from the binding operation position of the tie to the pre-positioning position of the tie. 
     When the interconnected ties are bound by the automated tying tool, the tie  20  moving to the pre-positioning position first needs to be separated from the tie connecting plate  202  using a riving knife  30 , then with the sliding effect of slider  1 , the tie body of the tie separated above is conveyed into the guide slots of the first guide claw  3  and the second guide claw  4 . 
     Please continue to refer to  FIG.  33   - FIG.  36   , in the present embodiment, first guide claw  3 , the slider  1 , the material pushing rod  9 , the cutter  7  and the riving knife  30  are all driven by a motor.  FIG.  33    is an isometric diagram of an embodiment of the present disclosure,  FIG.  34    is a front view,  FIG.  35    is a top view thereof,  FIG.  36    is an isometric diagram with the shell being removed, showing layout of major parts inside, and  FIG.  36    also displays a linkage mechanism in which the wheel disc  801 , the material pushing rod  9  and the riving knife  30  are driven by a motor  800 . A motor  100 , a reduction gearbox  110 , a motor  600 , a reduction gearbox  610 , a motor  800  and a gear box  813  are all mounted on the frame  5 . 
     Please continue to refer to  FIG.  37   - FIG.  41   , in the present embodiment, the movement relationship between the linkage mechanism, in which the wheel disc  801 , the material pushing rod  9  and the riving knife  30  are driven by the motor  800  (see  FIG.  36   ), and the slider  1  is mainly shown, and other parts are omitted. 
       FIG.  37    is an isometric diagram of assembling of wheel disc  801 , material pushing rod  9 , riving knife  30  and the slider  1 , and other parts such as the motor  800 , the gear box  813  and the housing are omitted. As shown in  FIG.  36    and  FIG.  37   , the power of the motor  800  is transmitted to a gear shaft  812  through the gear box  813  (the gear shaft  812  is an output shaft of the reduction gearbox), a gear  820  is sleeved on the gear shaft  812 , the gear  820  transmits the power to an indexing cam  804  and a cam shaft  907 , specifically, a cam of riving knife  308  and a cam of material pushing rod  908  are arranged on the cam shaft  907  at an interval along an axial direction of the cam shaft, the cam of riving knife  308  and the cam of material pushing rod  908  are both fixedly sleeved on the cam shaft  907 , and a connecting rod of ejector pin of riving knife  305  and a connecting rod of material pushing rod  904  both can rotate around an axis of a center shaft of connecting rod  905 . Axes of the indexing cam  804  and the wheel disc  801  are arranged in a manner of being spatially perpendicular but not intersecting to each other, the wheel disc  801  rotates by one interval every time the indexing cam  804  rotates by one circle, so that the wheel disc  801  performs the intermittent indexing motion, and the indexing cam  804  is also a double acting cam with a self-locking function. 
     In  FIG.  38   , the indexing cam  804  has just completed the indexing action on the wheel disc  801 , at this time the gear  820  drives the indexing cam  804  to continue to rotate, while the wheel disc  801  is locked by the indexing cam  804 ; the cam shaft  907  driven by the gear  820  drives a rising edge of the cam of riving knife  308  to act on the cam roller  307 , so that the connecting rod of ejector pin of riving knife  305  rotates clockwise around the center shaft of connecting rod  905 , the connecting rod of ejector pin of riving knife  305  drives the ejector pin of riving knife  302  to move upwards through a pin shaft  304 , and the ejector pin of riving knife  302  drives the riving knife  30  upwards, to slide upwards inside the slider  1  to separate the tie  20  from the tie connecting plate  202 . 
     In  FIG.  39   , the riving knife  30  has cut and separated the tie  20  from the tie connecting plate  202 , at this time the gear  820  drives the indexing cam  804  to continue to rotate, while the wheel disc  801  is locked by the indexing cam  804 ; the cam shaft  907  driven by the gear  820  drives a rising edge of the cam of material pushing rod  908  to act on the cam roller  906 , so that the connecting rod of material pushing rod  904  rotates anticlockwise around the center shaft of connecting rod  905 , the connecting rod of material pushing rod  904  drives the material pushing rod  9  to move downwards through the pin shaft  903 , and the material pushing rod  9  presses the tie  20  that has been cut off onto a bottom plate of the riving knife  30 , at which time, a falling edge of the cam of riving knife  308  contacts the cam roller  307 , and a reset spring of ejector pin of riving knife  309  pulls the ejector pin of riving knife  302  downwards to reset. 
     In  FIG.  40   , the material pushing rod  9  pushes the tie  20  that has been cut off together with the riving knife  30  downwards to the inside of the slider  1  to be positioned, at this time, the gear  820  drives the indexing cam  804  to rotate continuously while the wheel disc  801  is locked by the cam  804 , the cam shaft  907  driven by the gear  820  drives the falling edge of the cam of material pushing rod  908  to contact the cam roller  906 , and the reset spring of material pushing rod  909  pulls the material pushing rod  9  upwards to reset. 
     In the operation process, the motor  800  outputs power to a middle gear  820  through the gear box  810 , so that an upper gear  820  and a lower gear  820  which are in meshing transmission with the middle gear  820  rotate, wherein the lower gear  820  will drive the indexing cam  804  to rotate, and the indexing feeding of the wheel disc  801  is realized by the indexing cam  804 ; meanwhile, the upper gear  820  drives the cam shaft  907  to rotate, and in the rotating process of the cam shaft  907 , the cam of riving knife  308  rotates to finally realize rising of the riving knife  30  and thus complete the material cutting action; and when the cam shaft  907  rotates, the cam of material pushing rod  908  rotates, such that a pressing action of the material pushing rod  9  is realized. In the above, the wheel disc  801  rotates for material feeding; then, the riving knife  30  is risen to cut the material; thereafter, the material pushing rod  9  presses down the riving knife  30 ; finally, the material pushing rod  9  returns to an uppermost position ( FIG.  38   ), which is one operation cycle to realize material feeding, material cutting and reset of the riving knife  30 . A plurality of operation cycles are performed continuously, which can realize the automatic cutting action of the interconnected ties. 
     Such arrangement form driven in an all-electric manner enables the material feeding of the wheel disc  801 , the rising and material cutting of the riving knife  30  and the material pressing action of the material pushing rod  9  to be all driven by one motor  800 , moreover, various steps are carried out in sequence without mutual interference, thereby not only reducing the arrangement cost of the power device and enabling the space arrangement to be more compact, but also having higher automation degree, and being capable of completing the above actions in the continuous rotation process of the gear  820 , and thereby simplifying the control logic. 
       FIG.  41    is a right view corresponding to  FIG.  38   ,  FIG.  39    and  FIG.  40   , wherein a direction of arrow represents a feeding direction of the tie  20 . 
     Please continue to refer to  FIG.  42   - FIG.  44   , in the present embodiment,  FIG.  42    is an isometric diagram showing an assembling relationship among the slider  1 , the guide rail  2 , the riving knife  30 , the tie  20 , and a swinging arm  111 , a pin shaft  112  and a connecting rod  113  for driving the slider  1 ; and  FIG.  43    and  FIG.  44    are partial structural schematic views of the automated tying tool. 
     As shown in  FIG.  42   , the riving knife  30 , provided in an L shape, includes a vertical section and a horizontal section, wherein the vertical section acts as a cutting portion for achieving material separating, and the horizontal section acts as a sliding portion for sliding on the guide rail  2 . Among the four protruding ribs  104 , two protruding ribs  104  are formed integratedly with the slider  1 ; and the other two protruding ribs  104  are formed integratedly with the riving knife  30  and can slide up and down along with the riving knife  30  relative to the slider  1  in a direction of arrow shown in  FIG.  42   . 
     Alternatively, all of the four protruding ribs  104  are formed integratedly with the riving knife  30 , and can slide up and down along with the riving knife  30  relative to the slider  1  in a direction of arrow shown in  FIG.  42   . 
     Alternatively, the four protruding ribs  104  are all formed integratedly with slider  1 . 
     As shown in  FIG.  43   , after the ejector pin of riving knife  302  and the material pushing rod  9  are reset, the motor  100  drives the swinging arm  111  through the reduction gearbox  110  to rotate in an anticlockwise direction (a direction of arrow in  FIG.  43   ), the swinging arm  111  drives the connecting rod  113  through the pin shaft  112 , and the connecting rod  113  drives, through the pin shaft  114 , slider  1  together with the tie  20  to slide along the guide rail  2  from the pre-positioning position to the binding position, that is, to move from the right side to the left side in  FIG.  43   , to the position shown in  FIG.  44   . 
     Please continue to refer to  FIG.  44   , after the binding is completed, the head portion of tie  201  exits from the slider  1 , the motor  100  drives the swinging arm  111  to rotate in a clockwise direction (a direction of arrow in  FIG.  44   ), the swinging arm  111  drives the connecting rod  113  through the pin shaft  112 , and the connecting rod  113  drives, through the pin shaft  114 , the slider  1  together with the tie  20  to slide along the guide rail  2  from the binding position to the pre-positioning position. 
     In the present embodiment,  FIG.  50   - FIG.  52    are all schematic longitudinal sectional views of the automated tying tool, and as shown in  FIG.  50   - FIG.  52   , the trigger  11  is pivoted to the frame  5  through the trigger center shaft  118 , the trigger  11 , provided in an L shape, includes a pulling portion extending out of the frame  5  and a connecting portion located inside the frame  5 , and specifically, one end of the connecting rod of second guide claw  43  is provided with a strip-shaped hole, the pin shaft  45  is inserted into the strip-shaped hole, and the pin shaft  45  is fastened to one end of the trigger  11 , wherein the middle part of the connecting rod of second guide claw  43  is pivoted to the frame  5  through a center shaft of connecting rod  44 , the other end of the connecting rod of second guide claw  43  is also provided with a strip-shaped hole, and a pin shaft  42  is inserted into the strip-shaped hole, and wherein the pin shaft  42  is fixedly provided at an end portion of the second guide claw  4 , the second guide claw  4  is arranged in a W shape, the second guide claw  4  is sleeved on the center shaft of second guide claw  41 , and the center shaft of second guide claw  41  is fixedly mounted on the frame  5 . 
     Please continue to refer to  FIG.  50   - FIG.  52   , the principle of closing the second guide claw  4  with respect to the first guide claw  3  using the trigger  11  is as follows: the pulling portion of the trigger  11  is pulled so that the trigger  11  rotates around the trigger center shaft  118 , and in the rotating process of the trigger  11 , a connecting portion thereof drives, through the pin shaft  45 , the connecting rod of second guide claw  43  to rotate anticlockwise around the center shaft of connecting rod  44 , and further, the connecting rod of second guide claw  43  drives, through the pin shaft  42 , the second guide claw  4  to rotate clockwise around the center shaft of second guide claw  41 , so as to close relative to the first guide claw  3 . 
       FIG.  45   - FIG.  49    show the automatic binding structure of the automated tying tool. As shown in  FIG.  45   - FIG.  49   , in the present embodiment,  FIG.  45   ,  FIG.  47   ,  FIG.  48    and  FIG.  49    are all sectional views taken along line T-T of  FIG.  35   , wherein in  FIG.  45   , the second guide claw  4  is in an open state, and at this time, the tie  20  is positioned inside the slider  1  and located in a pre-positioning position. A binding process thereof is as follows: as shown in  FIG.  47   , the trigger  11  is pulled to enable the second guide claw  4  and the first guide claw  3  to close, the slider  1  drives the tie  20  to slide from a right end to a left end of the guide rail  2 , that is, to slide from the pre-positioning position to a binding operation position. In the sliding process of the slider  1 , the tie body of the tie  20  is curled in the guide slots in the first guide claw  3  and the second guide claw  4 ; as shown in  FIG.  48   , the first guide claw  3  driven by the motor  600  rotates around a center shaft of the first guide claw  31  to pass the tail portion of the tie  20  through the hole on the head portion of tie  201 , the tensioning wheel  6  driven by the motor  600  rotates to tighten the tie  20 , the cutter  7  driven by the motor  600  cuts off the tightened tie  20 , then completing the binding; as shown in  FIG.  49   , after the binding is completed, the second guide claw  4  is opened, after the head portion of tie  201  exits from the slider  1 , the motor  100  drives the swinging arm  111  to rotate clockwise, the swinging arm  111  drives the connecting rod  113  through the pin shaft  112 , the connecting rod  113  drives the slider  1  through the pin shaft  114  to retract back to the pre-positioning position of the tie to prepare for next binding cycle. 
     Please continue to refer to  FIG.  36   ,  FIG.  50   ,  FIG.  51    and  FIG.  52   , in  FIG.  36   , the motor  600  drives a period control gear  620  through the reduction gearbox  610 , the period control gear  620  drives the tensioning gear  630 , the period control gear  620  has a sensing portion  621  thereon, a sensor  622  is arranged on an end surface of the period control gear  620 , the sensor  622  sends a signal when detecting the sensing portion  621 , so that the motor  600  stops running, and the period control gear  620  rotates by one circle in each binding tensioning cycle; the cam of the first guide claw  38  is coaxially and fixedly connected with the period control gear  620 , as shown in  FIG.  50   - FIG.  52   , the cam of the first guide claw  38  drives a driven connecting rod  36  to rotate anticlockwise around a center shaft of driven connecting rod  37 , the driven connecting rod  36  drives the connecting rod  33  through the pin shaft  35  to rotate clockwise around the center shaft of connecting rod  34 , the connecting rod  33  drives the first guide claw  3  through the pin shaft  32  to rotate anticlockwise around the center shaft of the first guide claw  31 , and the first guide claw  3  rotates anticlockwise around the center shaft of the first guide claw  31  so that the tail portion of the tie passes through the hole on the head portion of the tie. In the present embodiment, the first guide claw  3  and the second guide claw  4  are both reset by spring. 
     It should be indicated that in the present embodiment, when the sensor  622  is a magnetic induction sensor, the sensing portion  621  can be provided as a magnet matched with the sensor; when the sensor  622  is a proximity sensor, the sensing portion  621  can be provided as a protrusion matched therewith; and when the sensor  622  is a photoelectric sensor, the sensing portion  621  may be a hole matched therewith. 
     Please continue to refer to  FIG.  53    and  FIG.  54   , in the present embodiment, the trigger  11  is replaced by the cam of second guide claw  47 , which drives the second guide claw  4 , the cam of second guide claw  47  is coaxially and fixedly connected with the period control gear  620 , the cam of second guide claw  47  rotates in an anticlockwise direction (directions of arrows shown in  FIG.  53    and  FIG.  54   ), the cam of second guide claw  47  drives the roller  46 , and the roller  46  is sleeved on the pin shaft  45 , the pin shaft  45  is fastened on the connecting rod of second guide claw  43 , the center shaft of connecting rod  44  is fastened on the frame  5 , the roller  46  drives the connecting rod of second guide claw  43  to perform anticlockwise rotation around the center shaft of connecting rod  44 , and the connecting rod of second guide claw  43  drives the second guide claw  4 , through the pin shaft  42 , to rotate clockwise around the center shaft of second guide claw  41  to be closed with the first guide claw  3 . The reset spring  119  enables the second guide claw  4  to reset, and a trigger reset spring  117  (shown in  FIG.  12   - FIG.  17   ) enables the trigger  11  to reset. 
     As shown in  FIG.  55   , in the present embodiment, an alternative solution to the mechanism for driving the wheel disc  801  is mainly displayed, and in  FIG.  55   , the indexing cam (single acting)  804  acts on the interval roller  803 , a locking block  809  is sleeved on a pin shaft  814  and can swing around the pin shaft  814 , the pin shaft  814  is fastened on the frame  5 , two inclined surfaces of the locking block  809  abut against outer circumferential surfaces of two adjacent interval rollers  803  under thrust of a spring  815 , each turn of the cam  804  leads to the rotation of an interval pin  808  of the wheel disc  801  by one indexing interval, the locking block  809  locks the wheel disc after preforming indexing. When the wheel disc  801  is in a locked state, the indexing cam  804  continues to rotate, sequentially, the rising edge of the cam  308  acts to lift the ejector pin of riving knife  302 , a reset spring of ejector pin of riving knife  309  hooks on the ejector pin of riving knife  302 , the reset spring of ejector pin of riving knife  309  pulls the ejector pin of riving knife  302  downwards to reset, when or after a vertex of the cam  308  pushes the ejector pin of riving knife  302  to a highest point, the rising edge of the cam  908  starts to act to enable the material pushing rod  9  to move downwards, the reset spring of material pushing rod  909  hooks on the material pushing rod  9 , and the reset spring of material pushing rod  909  enables the material pushing rod  9  to move upwards to reset; and the structure shown in  FIG.  55    have a similar working principle to a ratchet and a pawl. 
     As shown in  FIG.  56   , an incomplete gear  810  is used to replace the cam for engagement to drive the wheel disc  801  to perform the intermittent indexing motion, wherein there is only one tooth and an outer convex arc on circumference of the incomplete gear  810 , the wheel disc  801  is provided with a plurality of inner tooth profiles which are uniformly distributed and can be engaged with the tooth of the incomplete gear  810 , the wheel disc  801  is also provided with a plurality of inner concave arcs which are uniformly distributed and can be matched with the outer convex arc of the incomplete gear  810 , when the tooth of the incomplete gear  810  is engaged with the inner tooth profiles on the wheel disc  801 , the outer convex arc of the incomplete gear  810  is out of contact with the inner concave arc of the wheel disc  801 , the wheel disc  801  is in an indexing motion state, when the tooth of the incomplete gear  810  is disengaged from the inner tooth profiles on the wheel disc  801 , the outer convex arc of the incomplete gear  810  keeps in contact with the inner concave arc of the wheel disc  801 , the wheel disc  801  is in an indexing locked state, the incomplete gear  810  continues to rotate, and sequentially, the rising edge of the cam  308  acts to enable the ejector pin of riving knife  302  to rise, the rising edge of the cam  908  acts to enable the material pushing rod  9  to move downwards; the incomplete gear  810  can also be arranged outside the circumference of the wheel disc  801 , and when the incomplete gear  810  is arranged outside the circumference of the wheel disc  801 , the working principle of the incomplete gear is similar to that of a geneva mechanism; or, a geneva mechanism is used to replace the incomplete gear mechanism formed by combining the above incomplete gear  810  and the wheel disc  801 , namely, the wheel disc  801  is provided with uniformly distributed radial grooves and uniformly distributed inner concave arcs, a driving disc is additionally arranged to replace the incomplete gear  810 , a shifting pin and an outer convex arc are arranged on the driving disc, the shifting pin on the driving disc is engaged with the groove of the wheel disc  801  to drive the wheel disc  801  to rotate, and when the outer convex arc on the driving disc is matched with the inner concave arc of the wheel disc  801 , the wheel disc is locked, so that the intermittent indexing motion of the wheel disc is realized. 
     Such form of using the incomplete gear  810  or the single acting indexing cam  804 , as shown in  FIG.  55    and  FIG.  56   , to realize indexing feeding for the wheel disc  801  reduces the manufacturing difficulty of the indexing mechanism, thereby reducing the manufacturing cost of the automated tying tool, and further, by providing the incomplete gear  810  or the indexing cam  804  inside the wheel disc  801 , the external space is greatly saved, and thus the degree of compactness of the automated tying tool is improved. 
     Please continue to refer to  FIG.  57   , in the present embodiment, one-piece fixing ties with irregular head shapes such as aircraft head, mushroom head, and fir-tree head, a tie with a label, and a common tie with regular head shape are shown (in the figure, the tie  20  at the bottom is a common tie with regular head shape), and as long as the protruding ribs  104  are reasonably arranged on the slider  1  or the riving knife  30 , or on both the slider  1  and the riving knife  30  according to the specific head shape of the tie, the present disclosure can realize automatic binding for the interconnected ties with various irregular head shapes, the ties with a label, or common ties with regular head shape. 
     Please continue to refer to  FIG.  33    and  FIG.  36   , in the present embodiment, a controller  000  of the automated tying tool is connected to an external power source through a wire  001 , and the controller  000  is used to control on and off actions or start and stop of each motor or solenoid valve, or a battery and the controller  000  are both embedded in the housing  10 , or a rechargeable battery is connected to the housing through a clamp or a screw and integrated with the automated tying tool, so that the automated tying tool can be used independently in high altitude or field work. 
     Those skilled in the art further could make appropriate variations and modifications to the above embodiments according to the disclosure and teachings of the foregoing specification. Therefore, the present disclosure is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present disclosure should also fall within the scope of protection of the claims of the present disclosure. Furthermore, although some specific terms are used in the present specification, these terms are merely for the purpose of facilitating the description, rather than constituting any limitation on the present disclosure. 
     INDUSTRIAL APPLICABILITY 
     The material feeding, separating and pushing mechanism of a tying tool, the automated tying tool and the automated tying method provided in the present disclosure realize the automatic binding of the ties, overcome the drawback of great labor intensity and low binding efficiency of the manual binding operation, moreover, the present disclosure is especially designed for automatic binding of loose-packed or interconnected ties with different head shapes or ties with a label, and the present disclosure is also applicable to the automatic binding operation of loose-packed or interconnected common ties with a regular head shape, thus having relatively high degree of universalization, and bringing great convenience to the binding operation.