A method for recovering a jammed transmission mechanism

Abstract

This invention discloses a method for restoring a jammed transmission mechanism. The transmission mechanism includes a first toothed member, a second toothed member, and a pushing member. The first toothed member and the second toothed member mesh, and the first toothed member drives the second toothed member to move along a first direction. When the first toothed member and the second toothed member become jammed, the mechanism can be restored through the following steps: Step S1: The pushing member drives the second toothed member to move along a second direction, wherein the second direction is opposite to the first direction; Step S2: The first toothed member drives the second toothed member to move along the first direction. The operator can control the movement of the transmission mechanism through a steering member and a limiting member, thus resolving any jamming that occurs during the operation of the transmission mechanism.

Description

Technical Field

[0001] This invention relates to a method for restoring a transmission mechanism after it has jammed. Background Technology

[0002] As is well known, endocavitary staplers have been widely used in reconstructive surgeries of the stomach, colorectal region, etc.

[0003] Existing endoscopic anastomosis devices generally include a handle assembly, a shaft assembly extending longitudinally from the handle assembly, and an end effector located at the distal end of the shaft assembly. The shaft assembly contains a firing lever. The end effector contains a cutting blade. The firing lever is connected to the cutting blade. The handle assembly contains a transmission mechanism, which includes a rack and a gear connected to each other. The rack is connected to the firing lever. The gear drives the rack to move backward. The rack, through the firing lever, drives the cutting blade to move backward, i.e., retract the blade. However, during the retraction process, the gear and rack are prone to jamming, increasing surgical risks. Summary of the Invention

[0004] The purpose of this invention is to provide a method for restoring a transmission mechanism after it has jammed.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: The transmission mechanism includes a first toothed member, a second toothed member, and a pushing member. The first toothed member and the second toothed member mesh with each other. When the first toothed member drives the second toothed member to move along a first direction, the mechanism jams. The mechanism is restored through the following steps: Step S1: The pushing member drives the second toothed member to move along a second direction, thereby driving the first toothed member to move along the second direction, wherein the second direction is opposite to the first direction; Step S2: The first toothed member drives the second toothed member to move along the first direction.

[0006] Furthermore, the movement includes rotation and linear movement, or the movement includes rotation.

[0007] Furthermore, the steps also include step S0, which precedes step S1: the transmission mechanism further includes a steering member and a limiting member, the limiting member having a first position and a second position; when the limiting member is in the first position, the pushing member drives the second toothed member to move along the second direction; when the limiting member is in the second position, the first toothed member drives the second toothed member to move along the first direction; the steering member is moved, and the steering member drives the limiting member to move from the second position to the first position.

[0008] Furthermore, the steering component includes a groove and a pressing portion, and the limiting component includes a protrusion, the protrusion being at least partially located within the groove. Pressing the pressing portion upward causes the limiting component to move from the second position to the first position.

[0009] Furthermore, step S1 further includes: the transmission mechanism further includes a movable handle, the movable handle is activated, and the movable handle provides external force to cause the pushing member to drive the second toothed member to move along the second direction.

[0010] Furthermore, step S2 further includes: the transmission mechanism further includes a sector-shaped toothed cam, the sector-shaped toothed cam providing external force to cause the first toothed member to drive the second toothed member to move along the first direction.

[0011] Furthermore, step S1 further includes: the transmission mechanism further includes a first rod, the movable handle is connected to the pushing member on the first rod, the movable handle is activated, the movable handle drives the first rod to move in a second direction, the first rod drives the pushing member to move in the second direction, and the pushing member drives the second toothed member to move in the second direction.

[0012] Furthermore, step S1 further includes: the transmission mechanism further includes a tension spring, the tension spring being connected to the pushing member; when the first rod drives the pushing member to move forward, the tension spring pulls the pushing member backward to rotate the pushing member to abut against the second toothed member.

[0013] Furthermore, the pushing member includes a third main body and a protrusion extending from the third main body. The first rod is provided with a stop portion. When the limiting member is in the second position, the stop portion cooperates with the protrusion portion to prevent the pushing member from rotating around the first rod.

[0014] Furthermore, the transmission mechanism also includes a third toothed member, a fourth toothed member, and a second rod. The third toothed member and the fourth toothed member are both connected to the second rod body. The third toothed member meshes with the first toothed member, and the fourth toothed member meshes with the sector-shaped toothed cam. The second rod is provided with a linkage protrusion, which can cause the third toothed member and the fourth toothed member to rotate in the same direction.

[0015] Furthermore, when the limiting member is in 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 member is in the second position, the linkage protrusion is simultaneously connected to the third toothed member and the fourth toothed member, and the third toothed member and the fourth toothed member rotate in the same direction.

[0016] Furthermore, the transmission mechanism also includes a fifth toothed member, which meshes with the third toothed member. The third toothed member drives the fifth toothed member to rotate. The fifth toothed member is provided with a push block, which is used to push against the limiting member, so that the limiting member moves from the first position to the second position.

[0017] Furthermore, the toothed component is a gear or a rack.

[0018] The beneficial effect of the present invention is that the operator can release the jamming situation that occurs during the operation of the transmission mechanism by changing the transmission direction between the toothed parts from the first direction when jammed to the second direction in the opposite direction. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the anastomosis device of the present invention;

[0020] Figure 2 yes Figure 1 An exploded three-dimensional view of the anastomosis device shown;

[0021] Figure 3 yes Figure 2 A partial structural schematic diagram of the anastomosis device shown;

[0022] Figure 4 yes Figure 3 A partial structural schematic diagram of the anastomosis device shown;

[0023] Figure 5 yes Figure 4 A schematic diagram of the stapler from another angle;

[0024] Figure 6 yes Figure 5 A schematic diagram of the stapler from another angle;

[0025] Figure 7 yes Figure 6 An exploded three-dimensional view of the anastomosis device shown;

[0026] Figure 8 yes Figure 7 An exploded three-dimensional view of the anastomosis device structure shown.

[0027] Figure 9 yes Figure 6 A partial structural schematic diagram of the anastomosis device shown;

[0028] Figure 10 yes Figure 9 A schematic diagram of the stapler from another angle;

[0029] Figure 11 yes Figure 6 A partial structural schematic diagram of the anastomosis device shown;

[0030] Figure 12 yes Figure 11 A partial structural schematic diagram of the anastomosis device shown;

[0031] Figure 13 yes Figure 9 A partial structural schematic diagram of the anastomosis device shown;

[0032] Figure 14 This is a flowchart of the steps to unblock the transmission mechanism. Detailed Implementation

[0033] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. "Several" means at least one.

[0035] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0036] Existing intracavitary anastomosis devices generally include a handle assembly, a shaft assembly extending longitudinally from the handle assembly, and an end effector located at the distal end of the shaft assembly. The shaft assembly contains a firing lever. The end effector contains a cutting blade. The firing lever is connected to the cutting blade. The handle assembly contains a transmission mechanism, which includes a rack, a gear, and a pusher. The rack is connected to the firing lever. The rack drives the cutting blade forward or backward via the firing lever. The pusher pushes the rack forward, thus advancing the blade. The rack meshes with the gear, which drives the rack backward, thus retracting the blade. The handle assembly also includes a limiting member and a steering member. When the limiting member is in the first position, the pusher drives the rack forward, the rack rotates the gear, and the gear moves the limiting member from the first position to the second position. However, at this point, the gear and rack may jam, meaning the gear cannot move the limiting member from the first position to the second position. When the gear and rack are jammed, pressing down on the steering component moves the limiting component from the first position to the second position. When the limiting component is in the second position, firing the trigger of the matching device causes the gear to move the rack backward, thus retracting the tool. However, during the retraction process, when the gear and rack are jammed, the steering component cannot move the limiting component from the second position to the first position; that is, the jamming of the gear and rack during the retraction process cannot be resolved.

[0037] This invention discloses a structure to prevent a transmission mechanism from jamming. The transmission mechanism includes a first toothed member, a second toothed member, and a pushing member. The first and second toothed members mesh with each other, with the first toothed member driving the second toothed member to move along a first direction, and the pushing member driving the second toothed member to move along a second direction, wherein the second direction is opposite to the first direction. The transmission mechanism also includes a steering member and a limiting member. The steering member includes a groove, and the limiting member includes a protrusion, at least partially located within the groove. The steering member is used to drive the limiting member to switch between a first position and a second position. When the limiting member is in the first position, the pushing member drives the second toothed member to move along the second direction; when the limiting member is in the second position, the first toothed member drives the second toothed member to move along the first direction. The transmission mechanism also includes a third, fourth, and fifth toothed member. The third toothed member meshes with the first toothed member, and the fourth toothed member meshes with a trigger. The third and fourth toothed members can rotate in the same direction. The fifth toothed member meshes with the third toothed member, and the third toothed member drives the fifth toothed member to rotate. The fifth toothed member is provided with a push block, which is used to push against the limiting member, causing the limiting member to move from the first position to the second position. The steering member includes a pressing part. When the pressing part is pressed upward, the steering member drives the limiting member to move from the second position to the first position; when the pressing part is pressed downward, the steering member drives the limiting member to move from the first position to the second position.

[0038] The following describes in detail the structure for preventing the transmission mechanism from jamming, using a stapler as an example. The first toothed component corresponds to the third gear 183 of the stapler, the second toothed component corresponds to the rack 16 of the stapler, the third toothed component corresponds to the second gear 182 of the stapler, the fourth toothed component corresponds to the first gear 181 of the stapler, and the fifth toothed component corresponds to the fourth gear 184 of the stapler.

[0039] like Figure 1 As shown, 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 actuator 30 disposed at one end of the shaft assembly. The stapler 100 also includes a fixed handle 40 extending downward from the bottom of the handle assembly 10, a closing trigger 50, and a firing trigger 60. Further, the terms "proximal," "posterior," "distal," and "anterior" used in this invention are relative to the clinician operating the handle assembly 10 of the stapler 100. The terms "proximal" and "posterior" refer to the portion closer to the clinician, while the terms "distal" and "anterior" refer to the portion farther from the clinician. That is, the handle assembly 10 is proximal, and the end actuator 30 is distal; for example, the proximal end of a component refers to the end relatively closer to the handle assembly 10, and the distal end refers to the end relatively closer to the end actuator 30.

[0040] Combination Figure 2 and Figure 3 As shown, the closure trigger 50 can be actuated to position and close the end effector 30, which is connected to the distal end of the lever assembly 20. The end effector 30 includes a staple cartridge seat 31 and an abutment seat 32 pivotally connected to the staple cartridge seat 31 for operably supporting a staple cartridge (not shown). The abutment seat 32 is selectively movable between an open and closed position. Pressing the closure trigger 50 advances the lever assembly 20, causing the abutment seat 32 to pivot and close the end effector 30. In a preferred embodiment, the stapler 100 also includes a release button 70, which releases the closure trigger 50, thereby opening the end effector 30 for readjustment, clamping, and positioning of tissue. When the tissue to be processed is positioned between the staple cartridge seat 31 and the abutment seat 32, the surgeon can press the closure trigger 50 until it is locked, thereby placing the abutment seat 32 in the closed position, i.e., the end effector 30 is closed.

[0041] The end effector 30 includes a cutting blade 33, which is operably supported relative to the staple cartridge seat 31. Specifically, in this embodiment, the cutting blade 33 includes opposing proximal and distal ends. The proximal end of the cutting blade 33 is connected to a firing lever 21 disposed within the rod assembly 20, while the distal end of the cutting blade 33 is connected to a jaw member formed by the staple cartridge seat 31 and the abutment seat 32, and is movable from one end of the jaw member to the other. The cutting blade 33 can be moved from an unfired position to a distal firing position by a firing force transmitted by the firing trigger 60; it can also retract from the firing position to the unfired position in response to a retraction force applied to the cutting blade 33. The conversion from firing force to retraction force can be achieved by the steering assembly 12. It should be noted that the firing and retraction movements of the cutting blade 33 are only allowed to occur when the jaw components are closed. That is, the firing trigger 60 can only be actuated when the closing trigger 50 is locked on the fixed handle 40 to put the anvil 32 in the closed position, so as to prevent the cutting blade 33 from accidentally cutting non-target tissue due to the accidental pressing of the firing trigger 60 during the operation.

[0042] Combination Figures 3 to 7As shown, 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 a first position and a second position. When the limiting member 15 is in the first position, the cutting blade 33 can be subjected to a firing force transmitted by the firing trigger 60, causing the cutting blade 33 to move from an unfired position to a distal firing position. When the limiting member 15 is in the second position, the cutting blade 33 can be moved from a firing 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 portion 141 and a first protrusion 142 and a second protrusion 143 protruding from the first body portion 141. A groove 144 is formed between the first protrusion 142 and the second protrusion 143. The steering member 14 also includes a pressing portion 145 protruding from the first body portion 141. The protruding direction of the first protrusion 142 and the second protrusion 143 is a first direction, and the protruding direction of the pressing part 145 is a second direction, with the first direction perpendicular to the second direction. The pressing part 145 can be pressed by the operator to switch the limiting member 15 between a first position and a second position. The limiting member 15 includes a second main body 151 and a protrusion 152 extending from the second main body 151. Figure 10 The protrusion 152 is located within the groove 144. When the pressing part 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 part 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.

[0043] Combination Figures 8 to 13As shown, the transmission mechanism 13 includes a rack 16, a pusher 17, and several gears 18. The rack 16 is connected to the firing lever 21, which is connected to the cutting blade 33. The rack 16 drives the firing lever 21 to move forward or backward, and the firing lever 21 drives the cutting blade 33 to move forward or backward, thereby achieving blade advance or retraction. The pusher 17 is used to push the rack 16 forward. The transmission mechanism 13 also 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 pusher 17 is connected to the first rod 191 and can rotate around the first rod 191. The pushing member 17 includes a third main body 171, a protrusion 172 extending laterally from the side of the third main body 171, a finger-like portion 173 extending upward from the end of the third main body 171, and an abutment portion 174 extending upward from the head of the third main body 171. The first rod 191 is provided with a stop portion 195, which engages with the protrusion 172 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, which rotates synchronously with the movement of the movable handle 61. The movable handle 61 is connected to the first rod 191. When the stop portion 195 is separated from the protrusion 172, the movable handle 61 is fired, causing the first rod 191 to move forward, which in turn causes the pushing member 17 to move forward. The transmission mechanism 13 also includes a tension spring 80, which has a through hole 81 through which the finger-shaped portion 173 of the pusher 17 passes. When the first rod 191 moves forward, the tension spring 80 pulls the finger-shaped portion 173 backward, causing the pusher 17 to rotate clockwise until it abuts against the rack 16. The bottom of the rack 16 is concave upward to form a recessed hole 160. The clockwise rotation of the pusher 17 causes the abutting portion 174 of the pusher 17 to extend into the recessed hole 160, and the first rod 191 drives the pusher 17 to move forward, thereby pushing the rack 16 forward. The rack 16 pushes the firing rod 21 forward, thereby causing the cutting blade to move forward. The plurality of gears includes 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 linkage protrusion 196 protruding from the protruding ring 197. The linkage protrusion 196 is used to control the movement mode 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 simultaneously 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 rod 193, and the third gear 183 can rotate around the third rod 193. The fourth gear 184 is connected to the fourth rod 194, and the fourth gear 184 can rotate around the fourth rod 194. (The last sentence appears to be incomplete and possibly refers to a different configuration.) Figure 6 The second gear 182 simultaneously meshes with the third gear 183 and the fourth gear 184. That is, when any one of the three gears rotates, it drives the other two gears to rotate. The third gear 183 meshes with the rack 16. Specifically, the third gear 183 includes an integrally formed, synchronously rotating large gear and a small gear. The small gear meshes with the second gear 182, and the large gear meshes with the rack 16. For ease of description, the large gear and the small gear are collectively referred to as the third gear 183. Figure 5 The fan-shaped toothed cam 62 meshes with the first gear 181.

[0044] The following describes in detail the different movement modes of the transmission mechanism 13 when the limiting member 15 is in the first position and the second position, respectively.

[0045] When the limiting member 15 is in 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 without affecting each other. Specifically, in combination with Figure 11 , Figure 12The second main body 151 of the limiting member 15 includes two vertical parts 153 disposed opposite to each other and a horizontal part 154 connecting the two vertical parts 153. The two vertical parts 153 are located at both ends of the second rod 192. One end of the second rod 192 abuts against one side of the vertical part 153 of the limiting member 15, and the other end abuts against the first main body 141 of the steering member 14. A spring 198 is sleeved on the second rod 192, 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. At this time, the linkage protrusion 196 is only connected to the second gear 182 and is not connected to the first gear 181. The trigger 60 is activated, causing the movable handle 61 to rotate counterclockwise. This moves the first rod 191 forward, which in turn moves the pusher 17 forward. Simultaneously, the tension spring 80 pulls the pusher 17 backward, causing it to rotate clockwise. This allows the abutment 174 to extend into the recessed hole 160 of the rack 16 and push the rack 16 forward. The rack 16 then pushes the cutting blade 33 forward, thus achieving the cutting motion. After the rack 16 has moved forward a certain distance, the trigger 60 is activated again, and the above process repeats, with the pusher 17 pushing the rack 16 forward again. As the rack 16 moves forward, it drives the third gear 183 to rotate clockwise, which in turn drives the second gear 182 to rotate counterclockwise. The second gear 182 then drives the fourth gear 184 to rotate clockwise. Figures 11 to 12The fourth gear 184 is provided with a push block 185, which is used to push against the horizontal portion 154 of the second main body portion 151 of the limiting member 15, thereby causing the limiting member 15 to move downward. As the fourth gear 184 rotates, the push block 185 also rotates, abutting against the horizontal portion 154 of the limiting member 15 and pressing the limiting member 15 downward. That is, the downward pressing of the limiting member 15 by the push block 185 is carried out as the rack 16 moves forward until it reaches its position. The push block 185 pushes the limiting member 15 downward, thereby moving the limiting member 15 from the first position to the second position. At the same time, 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 disengages from one end of the second rod 192. Since a spring 198 is provided 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 away from the first main body 141 of the steering member 14. 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 cooperate with each other, thereby achieving rotation in the same direction. Releasing the firing trigger 60, the pushing member 17 returns to the starting position. Figure 9 , Figure 10 and Figure 12When the limiting member 15 moves from the first position to the second position, the vertical part 153 on one side of the limiting member 15 disengages from one end of the first rod 191, and the vertical part 153 of the limiting member 15 on the same side as the steering 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 away from the first main body part 141 of the steering member 14, so that the stop part 195 moves to the protrusion 172 and cooperates with the protrusion 172, so that the pushing member 17 cannot rotate clockwise around the first rod 191 under the action of external force, that is, the pushing member 17 cannot push the rack 16 forward under the action of external force. When the limiting member 15 is in 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 simultaneously disengages from one end of the first rod 191 and one end of the second rod 192, causing both the first rod 191 and the second rod 192 to move in a direction away from the first main body portion 141 of the steering member 14. The movement of the first rod 191 causes the stop portion 195 on the first rod 191 to engage with the protrusion 172 on the pushing member 17; the movement of the second rod 192 causes the first gear 181 and the second gear 182 to move together. When the limiting member 15 is in the second position, the trigger 60 is activated, and the movable handle 61 no longer acts on the pushing member 17. The sector-shaped 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. The third gear 183 drives the rack 16 to move backward, thereby realizing the tool retraction. During the tool retraction process, the rack 16 and the third gear 183 are prone to jamming, which prevents the rack 16 from moving further backward. At this time, the operator can manually press the pressing part 145 of the steering member 14 upward. The second protrusion 143 of the steering member 14 presses against the protrusion 152 upward, causing the limiting member 15 to move 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 disengages from one end of the first rod 191, while the vertical portion 153 on the other side of the limiting member 15 acts on the other end of the first rod 191, causing the first rod 191 to move toward the steering member 14, thereby separating the stop portion 195 from the protrusion 172. The second rod 192 also moves toward the steering member 14 due to the pressure of the vertical portion 153 of the limiting member 15, thereby disengaging the linkage protrusion 196 from the first gear 181. The pushing member 17 can continue to rotate clockwise and move forward under the action of the movable handle 61, the first rod 191, and the tension spring 80, thereby pushing the rack 16 forward and freeing the rack 16 from the jammed state with the third gear 183.Specifically, when rack 16 moves forward, it drives the second, third, and fourth gears 182, 183, and 184 to move, thereby driving the limiting member 15 from the first position to the second position. When the limiting member 15 moves to the second position, the protrusion 172 and the stop 195 cooperate to prevent the pushing member 17 from rotating clockwise. The linkage protrusion 196 causes the first gear 181 and the second gear 182 to rotate in the same direction. At this time, the trigger 60 is actuated again, which can drive the first, second, and third gears 181, 182, and 183 and rack 16 to move through the sector toothed cam 62, thereby realizing the backward movement of rack 16. The operator can manually press the pressing part 145 of the steering member 14 upward or downward to make the first and second protrusions 142 and 143 control the limiting member 15 to switch between the first and second positions, thereby manually controlling the forward and backward movement of rack 16, that is, manually controlling the tool feed and retraction. This design solves the problem of the rack 16 and the third gear 183 getting stuck and unable to continue moving.

[0046] like Figure 14 As shown, when the first toothed component drives the second toothed component to move along the first direction, it gets stuck. The following steps are used to restore it: Step S1: The pushing component drives the second toothed component to move along the second direction, which in turn drives the first toothed component to move along the second direction, wherein the second direction is opposite to the first direction; Step S2: The first toothed component drives the second toothed component to move along the first direction.

[0047] In summary, this invention utilizes the steering component 14 to control the position of the limiting component 15, and the position of the limiting component 15 determines the movement mode of the transmission mechanism. When the rack and gear are jammed, the steering component 14 can drive the limiting component 15 from the second position to the first position, and by advancing the cutting tool, the gear and rack move in opposite directions, thereby releasing the jamming.

[0048] 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. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for recovering a transmission mechanism after a jam, the transmission mechanism comprising a first toothed member, a second toothed member and a pushing member, the first toothed member being engaged with the second toothed member, the transmission mechanism being jammed when the first toothed member drives the second toothed member to move in a first direction, the recovery being performed by the following steps: Step S0: the transmission mechanism further comprises a turning member and a limiting member, the limiting member having a first position and a second position, the pushing member driving the second toothed member to move in a second direction when the limiting member is in the first position, the first toothed member driving the second toothed member to move in the first direction when the limiting member is in the second position, the turning member driving the limiting member to move from the second position to the first position; Step S1: the pushing member drives the second toothed member to move in the second direction, and in turn drives the first toothed member to move in the second direction, wherein the second direction is opposite to the first direction; Step S2: the first toothed member drives the second toothed member to move in the first direction. The movement comprises rotation and linear movement, or the movement comprises rotation. The turning member comprises a groove and a pressing portion, the limiting member comprises a protruding portion, the protruding portion being at least partially located in the groove, the pressing portion being pressed upward to drive the limiting member to move from the second position to the first position. The step S1 further comprises: the transmission mechanism further comprises a movable handle, the movable handle being fired to provide an external force to drive the pushing member to drive the second toothed member to move in the second direction. The step S2 further comprises: the transmission mechanism further comprises a sector-shaped toothed cam, the sector-shaped toothed cam providing an external force to drive the first toothed member to drive the second toothed member to move in the first direction. The step S1 further comprises: the transmission mechanism further comprises a first rod member, the movable handle and the pushing member being connected to the first rod member, the movable handle being fired to drive the first rod member to move in the second direction, the first rod member driving the pushing member to move in the second direction, the pushing member driving the second toothed member to move in the second direction. The step S1 further comprises: the transmission mechanism further comprises a tension spring, the tension spring being connected to the pushing member, the tension spring pulling the pushing member backward to drive the pushing member to rotate to abut against the second toothed member when the first rod member drives the pushing member to move. The pushing member comprises a third main body portion and a protruding portion protruding from the third main body portion, the first rod member being provided with a stop portion, the stop portion cooperating with the protruding portion to prevent the pushing member from rotating around the first rod member when the limiting member is in the second position. ​ ​ ​ 2. The method of claim 1, wherein: ​ 3. The method of claim 1, wherein: ​ 4. The method of claim 1, wherein: ​ 5. The method of claim 1, wherein: ​ 6. The method of claim 4, wherein: ​ 7. The method of claim 6, wherein: ​ 8. The method of claim 7, wherein: ​ 9. The method of claim 5, wherein: The transmission mechanism further comprises a third toothed member, a fourth toothed member and a second rod member, the third toothed member and the fourth toothed member are connected to the second rod member, the third toothed member is engaged with the first toothed member, the fourth toothed member is engaged with the sector gear cam, the second rod member is provided with a linkage protrusion, the linkage protrusion can promote the third toothed member and the fourth toothed member to rotate in the same direction.

10. The method of claim 9, wherein: When the limiting member is located at the first position, the linkage protrusion is only connected to the third toothed member, the third toothed member and the fourth toothed member rotate independently; when the limiting member is located at the second position, the linkage protrusion is simultaneously connected to the third toothed member and the fourth toothed member, the third toothed member and the fourth toothed member rotate in the same direction.

11. The method of claim 9, wherein: The transmission mechanism further comprises a fifth toothed member, the fifth toothed member is engaged with the third toothed member, the third toothed member drives the fifth toothed member to rotate, the fifth toothed member is provided with a push block, the push block is used for pushing the limiting member, so that the limiting member is moved from the first position to the second position.

12. A method of recovering a transmission mechanism after a seizure according to any one of claims 1 to 11, characterised in that: The toothed member is a gear or a rack.

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