CN111281456A

CN111281456A - Recovery method for transmission mechanism after being stuck

Info

Publication number: CN111281456A
Application number: CN201811508816.XA
Authority: CN
Inventors: 孙宝峰; 张志星
Original assignee: Jiangsu Fengh Medical Equipment Co Ltd
Current assignee: Jiangsu Fengh Medical Equipment Co Ltd
Priority date: 2018-12-08
Filing date: 2018-12-08
Publication date: 2020-06-16

Abstract

The invention discloses a recovery method after a transmission mechanism is stuck, wherein the transmission mechanism comprises a first toothed part, a second toothed part and a pushing part, the first toothed part is meshed with the second toothed part, the first toothed part drives the second toothed part to move along a first direction, and after the first toothed part and the second toothed part are meshed and stuck, the recovery method can be recovered through the following steps: step S1: the pushing piece drives the second toothed piece to advance along the second direction, wherein the second direction is opposite to the first direction; step S2: the first toothed piece drives the second toothed piece to move along the first direction. An operator controls the movement mode of the transmission mechanism through the steering piece and the limiting piece, and the blocking condition in the working process of the transmission mechanism can be relieved.

Description

Recovery method for transmission mechanism after being stuck

Technical Field

The invention relates to a recovery method of a dead transmission mechanism.

Background

It is known that endocavity cutting staplers have been commonly used in reconstructive surgery of the stomach, the colon, the rectum, etc.

Existing endocutters generally include a handle assembly, a shaft assembly extending longitudinally from the handle assembly, and an end effector disposed at a distal end of the shaft assembly. A firing rod is arranged in the rod body assembly. A cutting knife is arranged in the end effector. The firing rod is connected with the cutting knife. A transmission mechanism is arranged in the handle assembly and comprises a rack and a gear which are connected with each other. The rack is connected with the firing rod. The gear drives the rack to move backwards. The rack drives the cutting knife to move backwards through the firing rod, and then the cutting knife retracts. However, in the process of retracting the knife, the gear and the rack are easy to be stuck, and the operation risk is increased.

Disclosure of Invention

The invention aims to provide a recovery method for a dead transmission mechanism.

In order to achieve the purpose, the invention is realized by the following technical scheme: the transmission mechanism comprises a first toothed part, a second toothed part and a pushing part, the first toothed part is meshed with the second toothed part, and the first toothed part drives the second toothed part to be stuck when moving along a first direction, so that the transmission mechanism is recovered through the following steps: step S1: the pushing piece drives the second toothed piece to advance along a second direction, and further drives the first toothed piece to advance along the second direction, wherein the second direction is opposite to the first direction; step S2: the first toothed piece drives the second toothed piece to move along the first direction.

Further, the traveling includes rotation and linear movement, or the traveling includes rotation.

Further, the steps further include a step S0, which is located before the step S1: the transmission mechanism further comprises a steering component and a limiting component, the limiting component is provided with a first position and a second position, when the limiting component is located at the first position, the abutting component drives the second toothed component to move along the second direction, and when the limiting component is located at the second position, the first toothed component drives the second toothed component to move along the first direction; and moving the steering piece, wherein the steering piece drives the limiting piece to move from the second position to the first position.

Further, the steering member includes a groove and a pressing portion, the limiting member includes a convex portion, the convex portion is at least partially located in the groove, and the pressing portion is pressed upward, so that the limiting member moves from the second position to the first position.

Further, the step S1 further includes: the transmission mechanism further comprises a movable handle, the movable handle is triggered, and external force is provided by the movable handle to enable the pushing piece to drive the second toothed piece to advance along the second direction.

Further, the step S2 further includes: the transmission mechanism further comprises a sector toothed cam, and the sector toothed cam provides external force to enable the first toothed piece to drive the second toothed piece to advance along the first direction.

Further, the step S1 further includes: the transmission mechanism further comprises a first rod piece, the movable handle and the abutting piece are connected to the first rod piece, the movable handle is triggered, the movable handle drives the first rod piece to advance along a second direction, the first rod piece drives the abutting piece to advance along the second direction, and the abutting piece drives the second toothed piece to advance along the second direction.

Further, the step S1 further includes: the transmission mechanism further comprises a pull reed, the pull reed is connected to the abutting part, and when the first rod piece drives the abutting part to advance, the pull reed pulls the abutting part backwards to enable the abutting part to rotate to abut against the second toothed part.

Furthermore, the pushing element comprises a third main body part and a protruding part protruding from the third main body part, the first rod is provided with a stopping part, and when the limiting element is located at the second position, the stopping part is matched with the protruding part so that the pushing element cannot rotate around the first rod.

Further, drive mechanism still includes that the third has tooth spare, fourth to have tooth spare and second member, the third have tooth spare with the fourth has tooth spare all connect in the second body of rod, the third have tooth spare with first to have tooth spare meshing, the fourth have tooth spare with fan-shaped toothed cam meshing, the second member is equipped with the linkage lug, the linkage lug can impel the third to have tooth spare and fourth to have tooth spare syntropy to rotate.

Further, when the limiting member is located at the first position, the linkage protrusion is only connected to the third toothed member, and the third toothed member and the fourth toothed member rotate independently of each other; when the limiting part is located at the second position, the linkage lug is simultaneously connected with the third toothed part and the fourth toothed part, and the third toothed part and the fourth toothed part rotate in the same direction.

Furthermore, the transmission mechanism further comprises a fifth toothed element, the fifth toothed element is meshed with the third toothed element, the third toothed element drives the fifth toothed element to rotate, the fifth toothed element is provided with a pushing block, and the pushing block is used for pushing the limiting element in a propping manner, so that the limiting element moves from the first position to the second position.

Further, the toothed part is a gear or a rack.

The invention has the beneficial effects that: the operator can remove the jamming that occurs during operation of the transmission by switching the transmission direction between the toothed elements from a first direction when jammed to a second, opposite direction.

Drawings

FIG. 1 is a schematic diagram of the stapler of the present invention;

FIG. 2 is an exploded perspective view of the stapler shown in FIG. 1;

FIG. 3 is a schematic diagram of a portion of the stapler of FIG. 2;

FIG. 4 is a schematic diagram of a portion of the stapler of FIG. 3;

FIG. 5 is a schematic view of the stapler of FIG. 4 at another angle;

FIG. 6 is a schematic view of the stapler of FIG. 5 at another angle;

FIG. 7 is an exploded perspective view of the stapler shown in FIG. 6;

FIG. 8 is an exploded perspective view of a portion of the stapler shown in FIG. 7;

FIG. 9 is a schematic diagram of a portion of the stapler of FIG. 6;

FIG. 10 is a schematic view of the stapler of FIG. 9 at another angle;

FIG. 11 is a schematic view of a portion of the stapler of FIG. 6;

FIG. 12 is a schematic view of a portion of the stapler of FIG. 11;

FIG. 13 is a schematic view of a portion of the stapler of FIG. 9;

FIG. 14 is a flowchart of the steps for releasing the gear mechanism from jamming.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. The meaning of "a number" is at least one.

The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The prior art endocutter generally includes a handle assembly, a shaft assembly extending longitudinally from the handle assembly, and an end effector disposed at a distal end of the shaft assembly. A firing bar is arranged in the bar body component. A cutting knife is arranged in the end effector. The firing rod is connected with the cutting knife. The handle assembly is internally provided with a transmission mechanism which comprises a rack, a gear and a pushing piece. The rack is connected with the firing rod. The rack drives the cutting knife to move forwards or backwards through the firing rod. The pushing piece is used for pushing the rack forwards, so that the feed is realized. The rack is in meshed transmission with the gear, and the gear drives the rack to move backwards, so that tool retracting is realized. The handle assembly is further provided with a limiting part and a steering part, when the limiting part is located at the first position, the pushing part drives the rack to move forwards, the rack drives the gear to rotate, the gear drives the limiting part to move from the first position to the second position, however, the situation that the gear and the rack are clamped easily occurs at the moment, namely, the gear cannot drive the limiting part to move from the first position to the second position. When the gear and the rack are clamped, the steering piece is pressed downwards, the steering piece drives the limiting piece to move from the first position to the second position, and when the limiting piece is located at the second position, the gear can drive the rack to move backwards through a trigger of the trigger anastomat, so that tool withdrawal is realized. However, in the process of retracting the cutter, when the gear and the rack are clamped, the steering member cannot drive the limiting member to move from the second position to the first position, that is, the situation that the gear and the rack are clamped in the process of retracting the cutter cannot be solved.

The invention discloses a structure for preventing a transmission mechanism from being stuck, wherein the transmission mechanism comprises a first toothed piece, a second toothed piece and a pushing piece, the first toothed piece and the second toothed piece are in meshed transmission, the first toothed piece drives the second toothed piece to move along a first direction, and the pushing piece drives the second toothed piece to move along a second direction, wherein the second direction is opposite to the first direction. The transmission mechanism further comprises a steering piece and a limiting piece, the steering piece comprises a groove, the limiting piece comprises a convex portion, and the convex portion is at least partially located in the groove. The steering component is used for driving the limiting component to be switched between a first position and a second position, when the limiting component is located at the first position, the pushing component drives the second toothed component to move along the second direction, and when the limiting component is located at the second position, the first toothed component drives the second toothed component to move along the first direction. The transmission mechanism further comprises a third toothed piece, a fourth toothed piece and a fifth toothed piece. The third toothed part is meshed with the first toothed part, the fourth toothed part is meshed with the trigger, and the third toothed part and the fourth toothed part can rotate in the same direction. The fifth toothed part is meshed with the third toothed part, the third toothed part drives the fifth toothed part to rotate, the fifth toothed part is provided with a push block, and the push block is used for abutting against the limiting part to enable the limiting part to move from the first position to the second position. The steering piece comprises a pressing part, and when the pressing part is pressed upwards, the steering piece drives the limiting piece to move from the second position to the first position; when the pressing part is pressed downwards, the steering part drives the limiting part to move from the first position to the second position.

The structure for preventing the driving mechanism from being locked will be described in detail below by taking the stapler as an example. Wherein the first toothed member corresponds to a third gear 183 of the stapler, the second toothed member corresponds to a rack 16 of the stapler, the third toothed member corresponds to a second gear 182 of the stapler, the fourth toothed member corresponds to a first gear 181 of the stapler, and the fifth toothed member corresponds to a fourth gear 184 of the stapler.

As shown in fig. 1, the present invention relates to a stapler 100. Specifically, the stapler 100 includes a handle assembly 10, a shaft assembly 20 extending longitudinally from the handle assembly 10, and an end effector 30 disposed at one end of the shaft assembly. The stapler 100 further includes a stationary handle 40 extending downwardly from the bottom of the handle assembly 10, a closure trigger 50, and a firing trigger 60. Further, the terms "proximal", "posterior", and "distal", "anterior" as used herein are relative to a clinician manipulating handle assembly 10 of stapler 100. The terms "proximal" and "posterior" refer to the portion that is closer to the clinician, and the terms "distal" and "anterior" refer to the portion that is further from the clinician. That is, handle assembly 10 is proximal and end effector 30 is distal, as the proximal end of a component is shown relatively close to one end of handle assembly 10 and the distal end is shown relatively close to one end of end effector 30.

As shown in connection with fig. 2 and 3, the closure trigger 50 may be manipulated to position and close the end effector 30, the end effector 30 being attached to the distal end of the shaft assembly 20. The end effector 30 includes a cartridge seat 31 and an anvil seat 32 pivotally coupled to the cartridge seat 31, the cartridge seat 31 for operably supporting a staple cartridge (not shown) therein, the anvil seat 32 being selectively movable between an open position and a closed position. Pressing the closure trigger 50 may advance the shaft assembly 20 such that the anvil 32 pivots to close the end effector 30. In a preferred embodiment, stapler 100 further includes a release button 70, and closure trigger 50 can be released by operation of release button 70 to open end effector 30 for readjustment, clamping and positioning of tissue. When tissue to be treated enters between the cartridge seat 31 and the anvil 32, the surgeon may depress the closure trigger 50 until it locks, thereby placing the anvil 32 in the closed position, i.e., the end effector 30 in the closed state.

The end effector 30 includes a cutting knife 33, the cutting knife 33 being operably supported relative to the cartridge housing 31. in this embodiment, the cutting knife 33 includes opposing proximal and distal ends, wherein the proximal end of the cutting knife 33 is connected to a firing bar 21 disposed within the shaft assembly 20, and the distal end of the cutting knife 33 is connected to and movable from one end of the jaw member to the other end of the jaw member, which is comprised of the cartridge housing 31 and the staple abutment housing 32. The cutting blade 33 may be subjected to a firing force transmitted by the firing trigger 60 to move the cutting blade 33 from an unfired position to a distally fired position; and may also be retracted from the fired position to the unfired position in response to a retraction force applied to the cutting blade 33. The conversion of the firing force to the retraction force may be accomplished by the steering assembly 12. It should be noted that the firing and retraction motions of the cutting blade 33 must be allowed to occur with the jaw members closed, i.e., the firing trigger 60 may be actuated only when the closure trigger 50 is locked to the stationary handle 40 to place the anvil 32 in the closed position, to prevent accidental cutting of non-target tissue by the cutting blade 33 due to inadvertent pressing of the firing trigger 60 during the procedure.

As shown in fig. 3 to 7, the handle assembly 10 includes a body 11, a steering assembly 12, and a transmission mechanism 13. The steering assembly 12 includes a steering member 14 and a limiting member 15. The steering member 14 controls the limiting member 15 to switch between the first position and the second position. When the stop 15 is in the first position, the cutting blade 33 may be subjected to a firing force transmitted by the firing trigger 60 to move the cutting blade 33 from an unfired position to a distal fired position. When the stop 15 is in the second position, the cutting blade 33 may move the cutting blade 33 from the fired position to a proximal unfired position in response to a retraction force applied to the cutting blade 33. The steering member 14 includes a first body 141, and a first protrusion 142 and a second protrusion 143 protruding from the first body 141. A groove 144 is formed between the first bump 142 and the second bump 143. The steering member 14 further includes a pressing portion 145 projecting from the first body portion 141. The protruding direction of the first bump 142 and the second bump 143 is a first direction, the protruding direction of the pressing portion 145 is a second direction, and the first direction is perpendicular to the second direction. The pressing portion 145 can be pressed by an operator to switch the position-limiting member 15 between the first position and the second position. The stopper 15 includes a second body 151 and a protrusion 152 extending from the second body 151. Referring to fig. 10, the protrusion 152 is located within the recess 144. When the pressing portion 145 is pressed downward, the first protrusion 142 pushes against the protrusion 152 to move the limiting member 15 from the first position to the second position. When the pressing portion 145 is pressed upward, the second protrusion 143 pushes against the protrusion 152 to move the limiting member 15 from the second position to the first position.

As shown in fig. 8 to 13, the transmission mechanism 13 includes a rack 16, an urging member 17, and a plurality of gears 18. The rack 16 is attached to the firing bar 21 and the firing bar 21 is attached to the cutting blade 33. The rack 16 drives the firing rod 21 to move forward or backward, and the firing rod 21 drives the cutting knife 33 to move forward or backward, thereby realizing the feeding or retracting of the knife. The pushing member 17 is used for pushing the rack 16 forward. The transmission mechanism 13 further includes a first rod 191, a second rod 192, a third rod 193, and a fourth rod 194 mounted on the body 11, wherein the first rod 191 and the second rod 192 are movably mounted on the body 11. The pushing element 17 is connected to the first rod 191, and the pushing element 17 can rotate around the first rod 191. The pushing member 17 includes a third body 171, a protrusion 172 laterally protruding from a side surface of the third body 171, a finger 173 upwardly protruding from a distal end of the third body 171, and an abutting portion 174 upwardly protruding from a head end of the third body 171. The first rod 191 is provided with a stopping portion 195, and the stopping portion 195 is used for cooperating with the protrusion 172, so as to prevent the pushing member 17 from rotating around the first rod 191. The firing trigger 60 includes a movable handle 61 and a sector-shaped toothed cam 62, and the sector-shaped toothed cam 62 rotates synchronously with the movable handle 61. The movable handle 61 is connected to the first rod 191. When the stopping portion 195 is separated from the protruding portion 172, the movable handle 61 is triggered, the movable handle 61 drives the first rod 191 to move forward, and the first rod 191 drives the pushing member 17 to move forward. The transmission mechanism 13 further includes a pull spring 80, the pull spring 80 is provided with a through hole 81, and the finger 173 of the pushing member 17 passes through the through hole 81. When the first rod 191 moves forward, the pull spring 80 pulls the finger 173 backward, causing the pushing member 17 to rotate clockwise to abut against the rack 16. The bottom of the rack 16 is recessed upwardly to form a recessed hole 160. The pushing member 17 rotates clockwise, so that the abutting portion 174 of the pushing member 17 extends into the recess hole 160, and the first rod 191 drives the pushing member 17 to move forward to push the rack 16 forward. The rack 16 pushes the firing bar 21 forward, causing the cutting blade to move forward. The gears include a first gear 181, a second gear 182, a third gear 183, and a fourth gear 184. The first gear 181 and the second gear 182 are connected to the second rod 192, and the first gear 181 and the second gear 182 can rotate around the second rod 192. The second rod 192 is provided with a protruding ring 197 and a linking protrusion 196 protruding from the protruding ring 197, and the linking protrusion 196 is used for controlling the movement modes of the first gear 181 and the second gear 182. When the linkage protrusion 196 is only connected to the first gear 181 or the second gear 182, the first gear 181 and the second gear 182 are in a separated state, and the first gear 181 and the second gear 182 move independently without affecting each other. When the linkage protrusion 196 is connected to the first gear 181 and the second gear 182, the linkage protrusion 196 can cause the first gear 181 and the second gear 182 to cooperate with each other, that is, the first gear 181 and the second gear 182 can rotate in the same direction under the action of the linkage protrusion 196. The third gear 183 is connected to the third lever 193, and the third gear 183 is rotatable around the third lever 193. The fourth gear 184 is connected to the fourth rod 194, and the fourth gear 184 can rotate around the fourth rod 194. Referring to fig. 6, the second gear 182 is meshed with the third gear 183 and the fourth gear 184 simultaneously, that is, when any one of the second gear 182, the third gear 183 and the fourth gear 184 rotates, the other two gears are driven to rotate. The third gear 183 is engaged with the rack 16. Specifically, the third gear 183 includes a large gear and a small gear that are integrally formed and rotate in synchronization, the small gear is engaged with the second gear 182, and the large gear is engaged with the rack 16, and the large gear and the small gear are collectively referred to as the third gear 183 for convenience of description. Referring to fig. 5, the sector-shaped toothed cam 62 is engaged with the first gear 181.

The following describes in detail different movement modes of the transmission mechanism 13 when the limiting member 15 is at the first position and the second position respectively.

When the limiting member 15 is located at the first position, the first gear 181 and the second gear 182 are in a separated state, and the first gear 181 and the second gear 182 move independently and do not affect each other. Specifically, referring to fig. 11 and 12, the second body 151 of the limiting member 15 includes two vertical portions 153 disposed opposite to each other and a horizontal portion 154 connecting the two vertical portions 153. Two vertical portions 153 are located at both ends of the second rod 192. One end of the second rod 192 abuts against the vertical portion 153 of one side of the limiting member 15, and the other end abuts against the first main body 141 of the steering member 14. The second rod 192 is sleeved with a spring 198, one end of the spring 198 abuts against the protruding ring 197, and the other end abuts against the first main body 141 of the steering member 14. The first gear 181 and the second gear 182 are both connected to the protruding ring 197 of the second rod 192, the second gear 182 is located between the first gear 181 and the first main body 141 of the steering member 14, and the linkage protrusion 196 is only connected to the second gear 182 and is not connected to the first gear 181. When the trigger 60 is actuated, the movable handle 61 rotates counterclockwise, so as to drive the first rod 191 to move forward, the first rod 191 drives the pushing part 17 to move forward, meanwhile, the pulling spring piece 80 pulls the pushing part 17 backward, the pushing part 17 rotates clockwise, so that the abutting part 174 extends into the recess hole 160 of the rack 16 and pushes the rack 16 forward, and the rack 16 pushes the cutting knife 33 to move forward, so as to realize knife feeding. After the rack 16 has moved forward for a certain distance, the firing trigger 60 is actuated again, and the above process is repeated, and the rack 16 is pushed by the pushing member 17 to move forward again. When the rack 16 moves forward, the rack 16 drives the third gear 183 to rotate clockwise, the third gear 183 drives the second gear 182 to rotate counterclockwise, and the second gear 182 drives the fourth gear 184 to rotate clockwise. With reference to fig. 11 to 12, the fourth gear 184 is provided with a pushing block 185, and the pushing block 185 is used for pushing the horizontal portion 154 of the second main body 151 of the limiting member 15, so that the limiting member 15 moves downward. As the fourth gear 184 rotates, the pushing block 185 also rotates to abut against the horizontal portion 154 of the limiting member 15 and press the limiting member 15 downward, that is, the pushing block 185 presses the limiting member 15 downward as the rack 16 moves forward to a proper position. The pushing block 185 pushes the limiting member 15 downward, so that the limiting member 15 moves from the first position to the second position, and meanwhile, the limiting member 15 drives the steering member 14 to move downward through the protrusion 152. When the limiting member 15 moves from the first position to the second position, the vertical portion 153 of the second main body 151 of the limiting member 15 is separated from one end of the second rod 192, and because a spring 198 is disposed between the other end of the second rod 192 and the first main body 141 of the steering member 14, under the action of the spring 198, the second rod 192 moves in a direction away from the first main body 141 of the steering member 14, and at this time, the linkage protrusion 196 connects the first gear 181 and the second gear 182, that is, the first gear 181 and the second gear 182 are matched with each other, so that the same-direction rotation is realized. Releasing the firing trigger 60, the pusher 17 returns to the starting position. Referring to fig. 9, 10 and 12, when the limiting member 15 moves from the first position to the second position, the vertical portion 153 on one side of the limiting member 15 is separated from one end of the first rod 191, and the vertical portion 153 of the limiting member 15 on the same side as the turning member 14 moves downward to the other end of the first rod 191 and pushes against the first rod 191, so that the first rod 191 moves in a direction away from the first main body 141 of the turning member 14, so that the stopping portion 195 moves to the protruding portion 172 and engages with the protruding portion 172, and the pushing member 17 cannot rotate clockwise around the first rod 191 under the action of an external force, that is, the pushing member 17 cannot push the rack 16 forward under the action of an external force. That is, when the limiting member 15 is at the first position, the vertical portion 153 on one side of the limiting member 15 simultaneously presses against one end of the first rod 191 and one end of the second rod 192; when the limiting member 15 is in the second position, the vertical portion 153 is separated from the end of the first rod 191 and the end of the second rod 192 at the same time, so that the first rod 191 and the second rod 192 both move away from the first main body 141 of the steering member 14. The movement of the first rod 191 causes the stopping part 195 on the first rod 191 to cooperate with the protrusion 172 on the pushing part 17; the movement of the second rod 192 causes the first gear 181 to be interlocked with the second gear 182. When the limiting member 15 is located at the second position, the firing trigger 60 is actuated, the movable handle 61 does not act on the pushing member 17, the sector toothed cam 62 drives the first gear 181 to rotate clockwise, the second gear 182 is linked with the first gear 181, that is, the second gear 182 also rotates clockwise, the second gear 182 drives the third gear 183 to rotate counterclockwise, and the third gear 183 drives the rack 16 to move backward, so that the tool retracting is realized. During the retracting process, the rack 16 and the third gear 183 are easily caught, so that the rack 16 cannot move backward. At this time, the operator can manually press the pressing portion 145 of the steering member 14 upward, and the second protrusion 143 of the steering member 14 presses the protrusion 152 upward, so that the limiting member 15 moves from the second position to the first position. At this time, the vertical portion 153 of the limiting member 15 on the same side as the steering member 14 is separated from one end of the first rod 191, and the vertical portion 153 on the other side of the limiting member 15 acts on the other end of the first rod 191, so that the first rod 191 moves toward the steering member 14 to separate the stopping portion 195 from the protrusion 172. The second rod 192 is also moved toward the direction of the steering member 14 by the pressing of the vertical portion 153 of the limiting member 15, so that the linkage protrusion 196 is disengaged from the first gear 181. The pushing member 17 can rotate clockwise and move forward under the action of the movable handle 61, the first rod 191 and the pull spring 80, so as to push the rack 16 to move forward, and the rack 16 is free from the jamming state with the third gear 183. Specifically, when the rack 16 moves forward, the rack 16 drives the second, third, and

fourth gears

182, 183, 184 to move, so as to drive the limiting member 15 to move from the first position to the second position, when the limiting member 15 moves to the second position, the protrusion 172 and the stopping portion 195 cooperate with each other to prevent the abutting member 17 from rotating clockwise, the linking protrusion 196 enables the first gear 181 and the second gear 182 to rotate in the same direction, at this time, the trigger 60 is actuated again, and the sector-shaped toothed cam 62 drives the first, second, and

third gears

181, 182, 183 and the rack 16 to move, so as to achieve the backward movement of the rack 16. The operator manually presses the pressing portion 145 of the steering member 14 upwards or downwards, so that the first and

second protrusions

142, 143 control the position of the limiting member 15 to switch between the first and second positions, and thus the advance and retreat of the rack 16 can be manually controlled, i.e. the feed and retreat can be manually controlled. By the design, the problem that the rack 16 and the third gear 183 cannot move continuously due to jamming is solved.

As shown in fig. 14, when the first toothed member drives the second toothed member to travel along the first direction, the second toothed member is jammed, and the recovery is performed by the following steps: step S1: the pushing piece drives the second toothed piece to advance along a second direction, and further drives the first toothed piece to advance along the second direction, wherein the second direction is opposite to the first direction; step S2: the first toothed piece drives the second toothed piece to advance along the first direction.

In summary, the position of the limiting member 15 is controlled by the steering member 14, and the position of the limiting member 15 determines the motion mode of the transmission mechanism. When the rack and the pinion are jammed, the stopper 15 is driven by the steering member 14 to move from the second position to the first position, and the jam is released by feeding forward to move the pinion and the rack in the reverse direction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A recovery method after a transmission mechanism is stuck, wherein the transmission mechanism comprises a first toothed part, a second toothed part and a pushing part, the first toothed part is meshed with the second toothed part, the transmission mechanism is stuck when the first toothed part drives the second toothed part to move along a first direction, and recovery is carried out through the following steps:

step S1: the pushing piece drives the second toothed piece to advance along a second direction, and further drives the first toothed piece to advance along the second direction, wherein the second direction is opposite to the first direction;

step S2: the first toothed piece drives the second toothed piece to move along the first direction.

2. The method for recovering after-stuck transmission according to claim 1, wherein: the traveling includes rotation and linear movement, or the traveling includes rotation.

3. The method for recovering after-stuck transmission according to claim 1, wherein: the steps further include a step S0, located before the step S1: the transmission mechanism further comprises a steering component and a limiting component, the limiting component is provided with a first position and a second position, when the limiting component is located at the first position, the abutting component drives the second toothed component to move along the second direction, and when the limiting component is located at the second position, the first toothed component drives the second toothed component to move along the first direction; and moving the steering piece, wherein the steering piece drives the limiting piece to move from the second position to the first position.

4. The method for recovering after-stuck transmission according to claim 3, wherein: the steering component comprises a groove and a pressing portion, the limiting component comprises a convex portion, at least part of the convex portion is located in the groove, and the pressing portion is pressed upwards to enable the limiting component to move from the second position to the first position.

5. The method for recovering after-stuck transmission according to claim 1, wherein: the step S1 further includes: the transmission mechanism further comprises a movable handle, the movable handle is triggered, and external force is provided by the movable handle to enable the pushing piece to drive the second toothed piece to advance along the second direction.

6. The method for recovering after-stuck transmission according to claim 1, wherein: the step S2 further includes: the transmission mechanism further comprises a sector toothed cam, and the sector toothed cam provides external force to enable the first toothed piece to drive the second toothed piece to advance along the first direction.

7. The method for recovering after-stuck transmission according to claim 5, wherein: the step S1 further includes: the transmission mechanism further comprises a first rod piece, the movable handle and the abutting piece are connected to the first rod piece, the movable handle is triggered, the movable handle drives the first rod piece to advance along a second direction, the first rod piece drives the abutting piece to advance along the second direction, and the abutting piece drives the second toothed piece to advance along the second direction.

8. The method for recovering after-stuck transmission according to claim 7, wherein: the step S1 further includes: the transmission mechanism further comprises a pull reed, the pull reed is connected to the abutting part, and when the first rod piece drives the abutting part to advance, the pull reed pulls the abutting part backwards to enable the abutting part to rotate to abut against the second toothed part.

9. The method for recovering after-stuck transmission according to claim 8, wherein: the pushing piece comprises a third main body part and a protruding part protruding from the third main body part, the first rod piece is provided with a stopping part, and when the limiting part is located at the second position, the stopping part is matched with the protruding part so that the pushing piece cannot rotate around the first rod piece.

10. The method for recovering after-stuck transmission according to claim 6, wherein: the transmission mechanism further comprises a third toothed piece, a fourth toothed piece and a second rod piece, wherein the third toothed piece and the fourth toothed piece are connected to the second rod body, the third toothed piece is meshed with the first toothed piece, the fourth toothed piece is meshed with the fan-shaped toothed cam, the second rod piece is provided with a linkage lug, and the linkage lug can enable the third toothed piece and the fourth toothed piece to rotate in the same direction.

11. The method for recovering after-stuck transmission according to claim 10, wherein: when the limiting piece is located at the first position, the linkage lug is only connected with the third toothed piece, and the third toothed piece and the fourth toothed piece rotate independently; when the limiting part is located at the second position, the linkage lug is simultaneously connected with the third toothed part and the fourth toothed part, and the third toothed part and the fourth toothed part rotate in the same direction.

12. The method for recovering after-stuck transmission according to claim 10, wherein: the transmission mechanism further comprises a fifth toothed part, the fifth toothed part is meshed with the third toothed part, the third toothed part drives the fifth toothed part to rotate, the fifth toothed part is provided with a push block, and the push block is used for pushing the limiting part in a propping manner, so that the limiting part moves from the first position to the second position.

13. The recovery method after the stuck of the transmission according to any one of claims 1 to 12, wherein: the toothed part is a gear or a rack.