A power protection device for a stepper machine

Abstract

The present invention relates to the technical field of steppers, and in particular to a power protection device for a stepper, including a frame, which is fixedly arranged independently; a power shaft, which rotates vertically on the frame; a ring groove is arranged in the middle section of the power shaft; two circumferentially distributed relief grooves are also arranged in the middle section of the power shaft, and both relief grooves extend vertically, and the top is communicated with the ring groove; at least one side of the relief groove is an inclined surface; a motor, which is used to drive the power shaft to rotate; a sliding block, which slides vertically on the frame; a follower rod is arranged on the sliding block, and the end of the follower rod extends into the ring groove; a first spring, the bottom end of which abuts against the sliding block, and the top end abuts against the frame, and is always in a compressed state; a mounting arm, which is fixedly installed at the bottom of the sliding block and is used to install a cutter. The present invention can effectively solve the problems that the working state of the motor in the existing power supply system of the stepper is unstable, resulting in the power supply system being prone to overheating.

Description

Technical Field

[0001] The present invention relates to the technical field of stepping machines, and particularly to a power protection device for a stepping machine. Background Art

[0002] An industrial stepping machine is a device used for coil processing. Its main function is to punch holes, grooves or special shapes in continuous materials at set lengths and intervals through skip cutting and asynchronous cutting technologies. Skip cutting usually requires processing features with different spacings on the coil. For example, two adjacent holes need to be arranged in a pattern of 10 cm, 2 cm, 10 cm, 2 cm...

[0003] In the existing related technologies, for occasions where the coil is relatively small, such as tape, the power source of the stepping machine usually uses a smaller motor system to drive. Due to the special working requirements of skip cutting, the rotation speed of the motor needs to be continuously switched. In this unstable working state, the heat generated by the motor will increase, resulting in the power supply system of the stepping machine being prone to frequent overheat protection power-off and shutdown problems or even burning, affecting the safety of the power supply system of the stepping machine. Summary of the Invention

[0004] The present invention provides a power protection device for a stepping machine, which can effectively solve the problem that the working state of the motor in the existing power supply system of the stepping machine is unstable, resulting in the power supply system being prone to overheating.

[0005] A power protection device for a stepping machine provided by the present invention includes:

[0006] A frame, fixedly arranged independently;

[0007] A power shaft, rotating vertically on the frame; a ring groove is provided in the middle section of the power shaft; two circumferentially distributed relief grooves are also provided in the middle section of the power shaft, and both relief grooves extend vertically, and the top is communicated with the ring groove; at least one side of the relief groove is an inclined surface;

[0008] A motor, used to drive the power shaft to rotate;

[0009] A sliding block, sliding vertically on the frame; a follower rod is provided on the sliding block, and the end of the follower rod extends into the ring groove;

[0010] A first spring, with the bottom end abutting against the sliding block and the top end abutting against the frame, and always in a compressed state;

[0011] An installation arm, fixedly installed at the bottom of the sliding block, for installing a tool.

[0012] Further, the power shaft includes a core shaft and a sleeve;

[0013] The mandrel rotates vertically on the frame, and the annular groove is arranged on the mandrel; a relief groove is arranged on the mandrel;

[0014] The sleeve is sleeved at the bottom end of the mandrel and rotates synchronously with the mandrel; the sleeve is provided with an extending section extending upward, and the top of the extending section is flush with the lowest side surface of the annular groove; another relief groove is arranged on the extending section; a convex block corresponding to the extending section vertically is further arranged at the bottom end of the sleeve;

[0015] A switching block is arranged on the sliding block, and the switching block makes a sliding movement close to and away from the power shaft; a follower rod is arranged on the switching block; a second spring is arranged between the switching block and the sliding block, and the second spring is located on the side of the switching block away from the power shaft.

[0016] Furthermore, the bottom end of the mandrel is splined to the bottom end of the sleeve.

[0017] Furthermore, the end face of the switching block always extends out of the sliding block.

[0018] Furthermore, the switching block includes a sliding seat and a friction strip. The sliding seat slides on the sliding block, and the friction strip is detachably installed on the sliding block, and the end face of the friction strip extends out of the sliding block.

[0019] Furthermore, a plurality of second guide rods distributed up and down are arranged in the sliding block, and the switching block is penetrated by all the second guide rods, so that the switching block slides axially along the second guide rods;

[0020] The height of the second guide rod located above is higher than or equal to the height of the follower rod;

[0021] The height of the second guide rod located below is lower than or equal to the height of the convex block.

[0022] Furthermore, a transmission gear is arranged on the power shaft, and the transmission gear rotates synchronously with the power shaft and is located above the annular groove.

[0023] Furthermore, a thrust bearing is arranged at the bottom of the power shaft below the relief groove, and an alignment bearing is arranged at the top of the power shaft above the transmission gear.

[0024] Furthermore, a rotating wheel is arranged at the end of the follower rod, and the rotating wheel slides in the annular groove.

[0025] Furthermore, the sliding block is provided with a plurality of first guide rods extending upward and a plurality of third guide rods extending downward. Both the first guide rods and the third guide rods penetrate through the frame; the first spring is sleeved on the first guide rods.

[0026] Through the technical solution of the present invention, the following technical effects can be achieved:

[0027] Through the cooperation between the annular groove and the two relief grooves of the power shaft, as well as the follower rod of the sliding block and the first spring, this device can enable the motor to achieve the skip-cut function while maintaining a constant rotational speed, thereby keeping the motor in a stable working state, avoiding overheating of the motor, and further preventing the strider from frequently losing power and shutting down due to frequent overheating, effectively protecting the power circuit of the strider. This device can also adjust the positions of the two relief grooves, enabling the device to adapt to different skip-cut requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 Structural schematic diagram of the power protection device for the strider in the present invention;

[0030] Figure 2 Structural schematic diagram of the power protection device for the strider in the present invention (part of the frame is hidden);

[0031] Figure 3 Side view of the power protection device for the strider in the present invention;

[0032] Figure 4 Connection relationship diagram between the follower rod and the power shaft in the present invention;

[0033] Figure 5 Component disassembly diagram of the power shaft in the present invention;

[0034] Figure 6 Structural relationship diagram when the switching block is not pushed by the convex block in the present invention;

[0035] Figure 7 Structural relationship diagram when the switching block is pushed by the convex block in the present invention;

[0036] Figure 8 Structural schematic diagram of the sliding block in the present invention;

[0037] Figure 9 Component disassembly diagram of the switching block in the present invention;

[0038] Reference numerals: 1, frame; 2, power shaft; 2a, core shaft; 2b, sleeve; 21, annular groove; 22, relief groove; 23, extension section; 24, bump; 25, transmission gear; 3, motor; 4, slider; 41, follower rod; 42, switching block; 42a, sliding seat; 42b, friction strip; 43, second spring; 44, first guide rod; 45, second guide rod; 46, third guide rod; 5, first spring; 6, mounting arm. Detailed implementation

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0040] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] The whole striding machine is usually provided with components such as a passive roller, an active rubber roller, a stripping plate, a jump cutting device, a winding device, etc. for product processing. Specifically, after the coil passes through the upper passive roller and the active rubber roller, it is peeled off by the stripping plate so that the base paper can be recycled. Subsequently, under the action of the jump cutting device, the coil is stamped with a cutter to form products of the required size and arranged orderly on a new base paper, and finally the finished product is wound by the finished product winding device.

[0043] The present invention relates to a power protection device for a striding machine, which is mainly used for the jump cutting device in the striding machine, can keep the motor in a stable working state, thus avoiding overheating of the motor, avoiding frequent power outages and shutdowns of the striding machine due to frequent overheating, and can effectively protect the power circuit of the striding machine. The structure of this device is as Figures 1 to 4 shown, including:

[0044] The rack 1 is independently fixed on the ground or other fixed positions. The rack 1 is used to carry other components of the device and is also a part of the rack of the jump cutting device.

[0045] The power shaft 2 rotates in the vertical direction on the frame 1, and its rotation axis is its own axis; an annular groove 21 is arranged in the middle section of the power shaft 2, and the annular groove 21 is arranged around the circumference of the power shaft 2 for a full circle; the power shaft 2 is also provided with two circumferentially distributed paving grooves 22 in the middle section of the power shaft 2, and the two paving grooves 22 extend vertically, and the tops are connected with the annular groove 21; at least one side of the paving groove 22 is an inclined surface;

[0046] The motor 3 is connected to the power shaft 2 through a gear set transmission, a chain transmission, etc., and is used to drive the power shaft 2 to rotate;

[0047] The sliding block 4 slides on the frame 1 in the vertical direction; a follower rod 41 is provided on the sliding block 4, and the end of the follower rod 41 extends into the annular groove 21;

[0048] The first spring 5 has its bottom end against the sliding block 4 and its top end against the frame 1 and is always in a compressed state;

[0049] The mounting arm 6 is fixedly mounted on the bottom of the sliding block 4 and is used for mounting a tool.

[0050] The specific working principle of this device is as follows:

[0051] In the standby state, the two clearance grooves 22 will be offset from the follower rod 41, so the follower rod 41 can only slide in the annular groove 21. Under the limit of the side wall of the annular groove 21, the sliding block 4 will be at the top, and the first spring 5 will be in the most compressed state, and the mounting arm 6 will also be lifted upward, and the coil can be sent from under the cutter. As the motor 3 drives the power shaft 2 to rotate, a clearance groove 22 will align with the follower rod 41. At this time, without the limit of the side wall of the annular groove 21, the sliding block 4 will move downward quickly under the push of the first spring 5, so that the cutter of the mounting arm 6 punches out the required shape on the coil, and then as the power shaft 2 rotates, the follower rod 41 will climb back into the annular groove 21 along the inclined surface of the clearance groove 22, and then return to the standby state. After that, when the other clearance groove 22 reaches the position aligned with the follower rod 41, the above process is repeated again to complete a complete jump cutting process.

[0052] In this device, the skip cut distance can be controlled by the rotational speed of the motor 3 and the positions of the two relief slots 22. For example, if the required skip cut distances are 2 cm and 1 cm (i.e., 2:1), then as long as the outer and inner angles formed by the two relief slots 22 in the circumferential direction of the power shaft 2 are 240° and 120° respectively (i.e., also 2:1), and then the relationship between the rotational speed of the motor 3 and the coil transportation speed is controlled so that when the power shaft 2 rotates one circle, the coil advances 3 cm, the skip cut requirements in the above example can be achieved. It can be seen that under the action of this device, the motor 3 only needs to maintain a fixed rotational speed throughout the processing process. Compared with the traditional device where the rotational speed needs to be frequently switched, the motor 3 in this device works more stably. Therefore, the heat generation of the motor 3 and the requirement for the control accuracy of the device can be significantly reduced.

[0053] For different products, there will naturally be different requirements for the skip cut distance. To meet these different requirements, the method of processing multiple power shafts 2 with different ratios of the outer and inner angles of the relief slots 22 and then replacing the power shafts 2 can be adopted. However, this method will obviously result in too high processing and storage costs. Therefore, this device provides a structure of the power shaft 2 with adjustable positions of the relief slots 22, as Figure 5 shown:

[0054] The power shaft 2 includes a core shaft 2a and a sleeve 2b;

[0055] The core shaft 2a rotates vertically on the frame 1, and an annular groove 21 is provided on the core shaft 2a; a relief slot 22 is provided on the core shaft 2a;

[0056] The sleeve 2b is sleeved at the bottom end of the core shaft 2a and rotates synchronously with the core shaft 2a; the sleeve 2b is provided with an extension section 23 extending upward, and the top of the extension section 23 is flush with the lowest side of the annular groove 21; another relief slot 22 is provided on the extension section 23; a convex block 24 corresponding to the extension section 23 vertically is also provided at the bottom end of the sleeve 2b. By rotating the sleeve 2b, the included angle between the two relief slots 22 can be changed, so as to meet different skip cut requirements.

[0057] Of course, the above structure will cause the two relief slots 22 not to be in the same circumferential plane. Therefore, if the original slider 4 structure is simply used, the function of moving down at both relief slots 22 cannot be realized. Therefore, for the specially designed power shaft 2, the following structure also needs to be provided on the slider 4, as Figure 8 shown:

[0058] A switching block 42 is provided on the slider 4, and the switching block 42 makes a sliding movement close to and away from the power shaft 2; a follower rod 41 is provided on the switching block 42; a second spring 43 is provided between the switching block 42 and the slider 4, and the second spring 43 is located on the side of the switching block 42 away from the power shaft 2.

[0059] The specific working process and principle of the above structure are as follows: Figure 6 As shown, in the standby state, the two give way grooves 22 will be offset from the follower rod 41, and the switching block 42 and the protrusion 24 will also be offset and will not affect each other. Then, under the push of the second spring 43, the switching block 42 will be close to the power shaft 2, and the end of the follower rod 41 will be completely extended into the annular groove 21.

[0060] If the power shaft 2 rotates to the clearance groove 22 of the core shaft 2a and is aligned with the follower rod 41, the sliding block 4 can be lowered as described above, thereby driving the tool to descend, and then rise again to reset.

[0061] And before turning to the make way groove 22 of sleeve 2b, as Figure 7 As shown, the protrusion 24 will press against the switching block 42, so that the switching block 42 is away from the power shaft 2. At this time, the end of the follower rod 41 will move out of the annular groove 21 to the top of the extension section 23, and the sliding block 4 will remain stationary under the obstruction of the top of the extension section 23; until the yield groove 22 of the sleeve 2b is aligned with the follower rod 41, at this time the sliding block 4 will descend and drive the tool to descend, and then the sliding block 4 will be brought back to the highest point by the inclined surface of the yield groove 22, so that the end of the follower rod 41 returns to the top of the extension section 23.

[0062] Then, as the power shaft 2 rotates, the protrusion 24 will leave the switching block 42. At this time, under the push of the second spring 43, the switching block 42 will approach the power shaft 2, and the end of the follower rod 41 will completely extend into the annular groove 21, returning to the original state.

[0063] The core shaft 2a and the sleeve 2b can be connected by conventional screws, but since the core shaft 2a and the sleeve 2b need to be adjustable, the traditional screw connection method will limit the adjustable angle between the core shaft 2a and the sleeve 2b. Therefore, in the present device, it is preferred to use a spline connection between the bottom end of the core shaft 2a and the bottom end of the sleeve 2b, which can not only increase the adjustable angle range, but also ensure the torque transmission between the two, thereby ensuring the reliability of the synchronous rotation of the core shaft 2a and the sleeve 2b.

[0064] It is preferred to control the dimensions of each component so that the end face of the switching block 42 always extends to the outside of the sliding block 4 when the switching block 42 is close to or away from the power shaft 2, thereby ensuring that the protrusion 24 is always in contact with the switching block 42 and will not contact the side of the sliding block 4 to affect the movement of the sliding block 4, thereby ensuring the reliability of the device.

[0065] Since the protrusion 24 needs to make more contact with the switching block 42, which may cause wear, the present device preferably sets the switching block 42 into a split structure, such as Figure 9As shown in the figure, it includes a sliding seat 42a and a friction strip 42b. The sliding seat 42a slides on the sliding block 4. The friction strip 42b is detachably installed on the sliding block 4 by means of screw fixation, and the end face of the friction strip 42b extends to the outside of the sliding block 4. The extended surface frictions with the convex block 24, and the contact surfaces of the friction strip 42b and the convex block 24 should be subjected to heat treatments such as carburizing or quenching to improve their wear resistance. The follower rod 41 can be directly fixed on the sliding seat 42a or the friction strip 42b as required.

[0066] Preferably, a plurality of second guide rods 45 distributed vertically are arranged in the sliding block 4. The switching block 42 is penetrated by all the second guide rods 45, so that the switching block 42 slides axially along the second guide rods 45. The plurality of second guide rods 45 can better share the force of the switching block 42 to ensure that the switching block 42 can slide more smoothly.

[0067] Preferably, the height of the upper second guide rod 45 is higher than or equal to the height of the follower rod 41, and the height of the lower second guide rod 45 is lower than or equal to the height of the convex block 24, so that the distance between the upper and lower second guide rods 45 is not less than the distance between the follower rod 41 and the convex block 24. In this way, the force on the switching block 42 can be located between the upper and lower second guide rods 45, effectively avoiding the tendency of the switching block 42 to flip during movement and further ensuring the movement stability of the switching block 42.

[0068] A transmission gear 25 for driving connection with the motor 3 is usually arranged on the power shaft 2. The transmission gear 25 and the power shaft 2 are synchronously rotated through key connection. The position of the transmission gear 25 is preferably located above the annular groove 21. Here, while avoiding affecting the movement of the follower rod 41, it can be as close to the follower rod 41 as possible, which can offset the instability of the power shaft 2 caused by the downward pressure on one side of the power shaft 2 by the follower rod 41 to the greatest extent. Especially when the power shaft 2 is connected to the motor 3 by a belt, the tight belt will generate a pulling force on the power shaft 2 in the direction away from the sliding block 4, and the torque generated on the power shaft 2 will cancel out the torque generated by the downward pressure of the follower rod 41, thus ensuring the stable rotation of the power shaft 2.

[0069] A thrust bearing is arranged at the bottom of the power shaft 2 below the relief groove 22. The thrust bearing can bear a large axial load. In this way, when the follower rod 41 presses down on one side of the power shaft 2, the downward pressure transmitted to the power shaft 2 can be well borne by the thrust bearing. The inner ring end face of the thrust bearing can directly abut against the sleeve 2b to axially fix the sleeve 2b.

[0070] A aligning bearing is arranged at the top of the power shaft 2 above the transmission gear 25. The aligning bearing can bear a large radial load. In this way, when the follower rod 41 presses down one side of the power shaft 2, the whole will generate a large overturning tendency, and the aligning bearing can well bear the radial load at the top of the power shaft 2 generated thereby.

[0071] The power shaft 2 can be installed through the lower bearing seat, the upper mounting cylinder and the cover. The lower bearing seat is directly installed on the frame 1. The outer ring of the thrust bearing is clamped on the lower bearing seat, which can directly transfer the pressure of the follower rod 41 pressing down the power shaft 2 to the frame 1 to ensure the stability of the installation of the power shaft 2. The bottom end of the upper mounting cylinder is fixedly connected to the top surface of the lower bearing seat. The upper mounting cylinder is provided with a vertically penetrating through hole, and the power shaft 2 is arranged in the through hole; the outer ring of the aligning bearing is clamped on the top of the upper mounting cylinder. The cover is fixedly installed on the top of the upper mounting cylinder to block the through hole of the upper mounting cylinder.

[0072] Preferably, a rotating wheel is arranged at the end of the follower rod 41 extending into the annular groove 21, and the rotating wheel slides in the annular groove 21. There can be multiple rotating wheels, and they are axially attached to each other in pairs, so that the follower rod 41 can roll better in the annular groove 21.

[0073] Preferably, a plurality of first guide rods 44 extending upward and a plurality of third guide rods 46 extending downward are arranged on the sliding block 4. Both the first guide rods 44 and the third guide rods 46 pass through the frame 1. The first guide rods 44 and the third guide rods 46 can well limit the sliding trajectory of the sliding block 4, and further ensure the movement trajectory of the tool. The first spring 5 is sleeved on the first guide rod 44 to prevent the first spring 5 from skewing during compression and affecting its pushing effect on the sliding block 4.

[0074] The mounting arm 6 can be directly installed at the bottom of the third guide rod 46, and the third guide rod 46 is installed on the sliding block 4 by means of screw connection, so that the height of the mounting arm 6 can be adjusted within a certain range, that is, the height of the tool can be adjusted. The mounting arm 6 includes a tool holder and a cover plate, and the tool is clamped between the tool holder and the cover plate.

[0075] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A stepper machine power supply protection device, characterized in that: include: A frame (1), independently fixed; A power shaft (2) rotates on the frame (1) in a vertical direction; a ring groove (21) is arranged in the middle section of the power shaft (2); two circumferentially distributed clearance grooves (22) are also arranged in the middle section of the power shaft (2), and both of the two clearance grooves (22) extend in the vertical direction, and the tops are connected to the ring groove (21); at least one side of the clearance groove (22) is an inclined surface; A motor (3) for driving the power shaft (2) to rotate; A sliding block (4) slides on the frame (1) in a vertical direction; a follower rod (41) is provided on the sliding block (4), and an end of the follower rod (41) extends into the annular groove (21); A first spring (5), the bottom end of which abuts against the sliding block (4), the top end of which abuts against the frame (1), and the first spring (5) is always in a compressed state; A mounting arm (6) fixedly mounted on the bottom of the sliding block (4) and used for mounting a tool; Wherein, the power shaft (2) comprises a core shaft (2a) and a sleeve (2b); The core shaft (2a) rotates in a vertical direction on the frame (1); the annular groove (21) is arranged on the core shaft (2a); and a clearance groove (22) is arranged on the core shaft (2a); The sleeve (2b) is sleeved on the bottom end of the core shaft (2a) and rotates synchronously with the core shaft (2a); the sleeve (2b) is provided with an extension section (23) extending upward, and the top of the extension section (23) is flush with the lowest side surface of the annular groove (21); another clearance groove (22) is provided in the extension section (23); and a protrusion (24) vertically corresponding to the extension section (23) is also provided at the bottom end of the sleeve (2b); A switching block (42) is arranged on the sliding block (4), and the switching block (42) performs sliding movement towards and away from the power shaft (2); the follower rod (41) is arranged on the switching block (42); a second spring (43) is arranged between the switching block (42) and the sliding block (4), and the second spring (43) is located on a side of the switching block (42) away from the power shaft (2).

2. The stepper machine power supply protection device according to claim 1, characterized in that: The bottom end of the core shaft (2a) is spline-connected to the bottom end of the sleeve (2b).

3. The stepper machine power supply protection device according to claim 1, characterized in that: The end surface of the switching block (42) always extends to the outside of the sliding block (4).

4. The stepper machine power supply protection device according to claim 3, characterized in that: The switching block (42) comprises a sliding seat (42a) and a friction strip (42b), wherein the sliding seat (42a) slides on the sliding block (4), and the friction strip (42b) is detachably mounted on the sliding block (4), and an end surface of the friction strip (42b) extends outward from the sliding block (4).

5. The stepper machine power supply protection device according to claim 1, characterized in that: A plurality of second guide rods (45) distributed vertically are arranged in the sliding block (4), and the switching block (42) is penetrated by all the second guide rods (45), so that the switching block (42) slides axially along the second guide rods (45); The height of the second guide rod (45) located at the top is higher than or equal to the height of the follower rod (41); The height of the second guide rod (45) located below is lower than or equal to the height of the protrusion (24).

6. The stepper machine power supply protection device according to claim 1, characterized in that: The power shaft (2) is provided with a transmission gear (25), the transmission gear (25) rotates synchronously with the power shaft (2), and the transmission gear (25) is located above the annular groove (21).

7. The stepper machine power supply protection device according to claim 6, characterized in that: A thrust bearing is arranged at the bottom of the power shaft (2) below the clearance groove (22), and a self-aligning bearing is arranged at the top of the power shaft (2) above the transmission gear (25).

8. The stepper machine power supply protection device according to claim 1, characterized in that: A rotating wheel is provided at the end of the follower rod (41), and the rotating wheel slides in the annular groove (21).

9. The stepper machine power supply protection device according to claim 1, characterized in that: The sliding block (4) is provided with a plurality of first guide rods (44) extending upward and a plurality of third guide rods (46) extending downward, wherein the first guide rods (44) and the third guide rods (46) both pass through the frame (1); and the first spring (5) is sleeved on the first guide rods (44).

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