A sensor-based automatic knife sharpening machine cutting bed

Abstract

This invention discloses a sensor-based automatic sharpening mechanical cutting bed, relating to the field of fabric cutting technology. It includes a frame, a first support slidably connected to the frame along a first direction, and a second support slidably connected to the first support along a second direction. The second support houses a cutting blade and a cutting blade transmission mechanism for driving the blade's movement. The second support also houses a sharpening mechanism, which includes: a sharpening wheel assembly; a feeding mechanism for driving the sharpening wheel assembly to move towards or away from the cutting blade; in two adjacent feed cycles, the stroke of the later feed is greater than the stroke of the previous feed; and a reciprocating drive mechanism for driving the sharpening wheel assembly to cyclically reciprocate along the blade length direction of the cutting blade. This invention enables automatic sharpening of the cutting blade without disassembling it.

Description

[0001] Cross-reference to related applications

[0002] This application is a divisional application of Chinese patent application No. 202310916805X, filed on July 25, 2023, entitled "A Mechanical Cutting Bed with Automatic Sharpening". Technical Field

[0003] This invention relates to the field of fabric cutting technology, and more particularly to a mechanical cutting bed with automatic blade sharpening. Background Technology

[0004] With the advancement of mechanization, most industries are moving towards mechanization and automation. The same has been achieved in the field of fabric cutting, where most existing fabric cutting machines are used.

[0005] However, existing cutting machines still have many problems in actual use, such as:

[0006] 1. Due to the high degree of automation in cutting machines and the large amount of fabric cut per unit time, the cutting blades on the cutting machine experience significant wear. Worn blades lead to a decline in fabric cutting quality and may even render the fabric unusable. Therefore, timely sharpening of the cutting blades is necessary. Current technology primarily employs manual sharpening, and the results are entirely dependent on manual control, resulting in inconsistent quality.

[0007] 2. The movement of the cutting blade is usually achieved by a crank mechanism. However, in actual use, technicians have found that due to the influence of machining accuracy, in addition to driving the cutting blade to move along the blade body direction, the crank mechanism will also cause vibration in the thickness direction of the blade body. This results in uneven cuts in the fabric during the cutting process. Summary of the Invention

[0008] In order to solve at least one of the technical problems mentioned in the background art, the present invention aims to provide an automatic knife sharpening machine bed that can automatically sharpen the cutting knife, and the sharpening effect is uniform and stable.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] An automatic knife-sharpening mechanical cutting bed includes a frame, a first support slidably connected to the frame along a first direction, and a second support slidably connected to the first support along a second direction. A cutting blade and a cutting blade transmission mechanism for driving the cutting blade are disposed on the second support. A sharpening mechanism is disposed on the second support, and the sharpening mechanism includes:

[0011] Grinding wheel assembly;

[0012] The feed mechanism is used to drive the grinding wheel assembly to move toward or away from the cutting tool; in two adjacent feed processes, the stroke of the later feed is greater than the stroke of the previous feed;

[0013] The reciprocating drive mechanism is used to drive the grinding wheel assembly to reciprocate along the length of the cutting edge of the cutter.

[0014] In some embodiments of the present invention, the sharpening wheel assembly includes two sharpening wheels that are offset from each other in the length direction of the cutting edge of the cutter. The two sharpening wheels partially overlap to form a sharpening opening for the cutting edge of the cutter to enter. When the feeding mechanism drives the sharpening wheel assembly to move toward the cutter, the cutting edge of the cutter enters the sharpening opening, and the two sides of the cutting edge abut against the sharpening wheels on both sides of the sharpening opening.

[0015] In some embodiments of the present invention, the two grinding wheels rotate in opposite directions at the grinding edge.

[0016] In some embodiments of the present invention, the feeding mechanism includes a lead screw and a slider that is relatively fixed to the grinding wheel assembly in the feeding direction. The lead screw is rotatably mounted on a second support, and the slider is threadedly engaged with the lead screw.

[0017] In some embodiments of the present invention, the feeding mechanism is provided with a sensor and a controller for detecting the feed stroke of the grinding wheel assembly; in two adjacent feeding processes, the sensor detects the first stroke of the previous feeding and transmits it to the controller, the controller adds a fixed value to the first stroke to obtain the second stroke, and in the subsequent feeding process, controls the feeding mechanism to drive the grinding wheel assembly to feed the second stroke.

[0018] In some embodiments of the present invention, the reciprocating drive mechanism includes a rotating wheel and a protrusion that is relatively fixed to the grinding wheel assembly along the blade length direction of the cutting blade; a track with a height difference along the blade length direction of the cutting blade is provided on the outer periphery of the rotating wheel, and the protrusion slides in cooperation with the track.

[0019] In some embodiments of the present invention, the second support includes a rear support and a front support that can slide relative to each other along the blade length direction of the cutter. The rear support is slidably connected to the first support along a second direction. The front support is provided with the cutter and a cutter transmission mechanism for driving the cutter to move. During the sharpening process, the front support slides relative to the rear support.

[0020] In some embodiments of the present invention, the cutting tool transmission mechanism includes:

[0021] Tool holder assembly;

[0022] A knife clip is used to hold a cutting knife; the knife clip is located at the first end of the knife holder.

[0023] The tool holder fixing seat slides in conjunction with the tool holder assembly;

[0024] A crank mechanism is used to drive the sliding of the tool holder assembly relative to the tool holder fixed seat. The crank mechanism includes several crank connecting rods that are rotatably connected end to end in sequence, and the end crank connecting rod is connected to the second end of the tool holder assembly.

[0025] The swing mechanism includes a swing groove, a swing connecting rod, and a swing seat; the middle part of the swing connecting rod is rotatably connected to one of the plurality of crank connecting rods; the first end of the swing connecting rod is rotatably connected to the swing seat, and the second end is slidably engaged with the swing groove; during the swinging process of the crank connecting rod, the second end of the swing connecting rod swings along the swing groove.

[0026] In some embodiments of the present invention, the crank mechanism includes a first crank connecting rod and a second crank connecting rod driven by a rotary cam, the second crank connecting rod being connected to a second end of a tool holder assembly; the middle portion of the oscillating connecting rod is rotatably connected to the middle portion of the second crank connecting rod.

[0027] In some embodiments of the present invention, the tool holder assembly includes a movable connecting joint and a tool holder; the movable connecting joint is rotatably connected to a crank connecting rod at its end, and the tool holder is rotatably connected to the movable connecting joint along its axial direction.

[0028] In some embodiments of the present invention, the tool holder assembly further includes a tool sleeve, which is disposed between the tool holder and the tool holder fixing seat. The tool sleeve and the tool holder are rotatably connected via bearings, and the tool sleeve is slidably engaged with the tool holder fixing seat.

[0029] In some embodiments of the present invention, a clamping assembly is further included, the clamping assembly including a timing wheel set and a first clamping block disposed on the timing wheel set, the first clamping block having a clamping groove for sliding cooperation with a cutting blade.

[0030] In some embodiments of the present invention, the blade clamping assembly further includes a plurality of blade clamping wheels that are in contact with the surface of the cutting blade.

[0031] In some embodiments of the present invention, the clamping wheel includes a side clamping wheel that is respectively attached to both sides of the blade of the cutter and a blade clamping wheel that is attached to one side of the cutting edge of the cutter.

[0032] In some embodiments of the present invention, one of the clamping wheel and the clamping groove is located in the middle of the cutter, and the other is located in the lower part of the cutter.

[0033] A dual-gear backlash adjustment mechanism, comprising

[0034] Guide rail, with a slider that slides on the guide rail;

[0035] A rack is arranged parallel to the guide rail;

[0036] The connecting plate is fixedly connected to the slider;

[0037] The pulley assembly includes two first pulleys rotatably mounted on a connecting plate, at least one second pulley, and a belt that is sleeved on the outside of both the first and second pulleys; each first pulley is rotatably mounted with a coaxial gear, and the two gears mesh with the rack respectively; the gears are fixedly connected to a gear shaft, and the gear shaft is rotatably connected to the first pulley;

[0038] A locking mechanism is used to lock the first pulley and gear, so that they rotate synchronously.

[0039] In some embodiments of the present invention, a tensioning mechanism is also included, the tensioning mechanism comprising a pressure roller abutting against the belt, and a top contact mechanism for maintaining the pressure roller abutting against the belt.

[0040] In some embodiments of the present invention, the top contact mechanism includes a mounting base fixedly mounted on a connecting plate, a slide rod slidably connected to the mounting base, a wheel seat for mounting a pressure roller connected to the first end of the slide rod, and an elastic element provided with elastic force to the pressure roller toward the belt side is sleeved on the outside of the slide rod.

[0041] In some embodiments of the present invention, the elastic element includes a first spring and a second spring, both of which are compression springs, respectively sleeved on the outside of the slide rod at the portions located on both sides of the wheel seat.

[0042] In some embodiments of the present invention, the second end of the slide rod is threaded with an adjusting nut, and the adjusting nut abuts against a second spring located on the same side of the wheel seat.

[0043] In some embodiments of the present invention, the mounting base is provided with a waist-shaped hole and a bolt, and the bolt passes through the waist-shaped hole and is threadedly connected to the connecting plate.

[0044] In some embodiments of the present invention, the locking mechanism includes a shrinking sleeve disposed between the first pulley and the gear shaft.

[0045] In some embodiments of the present invention, a rotating assembly is provided between the gear shaft and the connecting plate. The rotating assembly includes a rotating seat fixedly mounted on the connecting plate, and the rotating seat and the gear shaft are rotatably connected via a plurality of bearings.

[0046] In some embodiments of the present invention, the connecting plate is further provided with a motor for driving the second pulley to rotate.

[0047] A method for zero backlash adjustment of a dual-gear transmission, employing the dual-gear backlash adjustment mechanism described above, includes the following steps:

[0048] S1, set the first pulley and gear to a relative rotational state;

[0049] S2, the belt is initially pressed against the part between the two first pulleys, so that the belt tension reaches the first tension value;

[0050] S3, adjust the two gears to rotate in opposite directions until the torque of the gears reaches the first torque value, and switch the first pulley and gear to the synchronous locking state;

[0051] S4, press the belt again between the two first pulleys to make the belt tension reach the second tension value.

[0052] Compared with the prior art, the beneficial effects of the present invention are:

[0053] 1. This invention enables the grinding wheel assembly to move toward or away from the cutting blade through a feeding mechanism, thereby achieving automated grinding of the cutting blade with uniform and stable grinding results.

[0054] 2. The present invention controls the stroke of the subsequent feed to be greater than that of the previous feed, ensuring that the cutting tool can be effectively ground. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0056] Figure 2 This is a schematic diagram of the second support of the present invention.

[0057] Figure 3 This is a schematic diagram of the cutting blade transmission mechanism of the present invention.

[0058] Figure 4 This is a schematic diagram of the swing mechanism in the first state of the present invention.

[0059] Figure 5 This is a schematic diagram of the swing mechanism in the second state of the present invention.

[0060] Figure 6 This is a side view of the present invention.

[0061] Figure 7 for Figure 6 AA sectional view.

[0062] Figure 8 for Figure 7 A magnified view of section B.

[0063] Figure 9 This is a schematic diagram of the cutting tool transmission mechanism from another perspective of the present invention.

[0064] Figure 10 for Figure 9 Enlarged view of a section at point C.

[0065] Figure 11 This is a schematic diagram of the grinding mechanism of the present invention.

[0066] Figure 12 This is a schematic diagram of the grinding wheel assembly of the present invention.

[0067] Figure 13 This is a schematic diagram showing the overlap of the two grinding wheels of the present invention.

[0068] Figure 14 This is a schematic diagram of the feeding mechanism of the present invention.

[0069] Figure 15 This is a schematic diagram of the reciprocating drive mechanism of the present invention.

[0070] Figure 16 This is a schematic diagram of the grinding wheel assembly of the present invention after shell removal.

[0071] Figure 17 This is a schematic diagram of the overall dual-gear backlash adjustment mechanism of the present invention.

[0072] Figure 18 This is a front view of the dual-gear backlash adjustment mechanism of the present invention.

[0073] Figure 19 This is a schematic diagram of the gear and rack assembly of the present invention.

[0074] Figure 20 This is a schematic diagram of the tensioning mechanism of the present invention.

[0075] Figure 21 This is a partial cross-sectional view of the connection between the first pulley and the rack of the present invention.

[0076] Figure 22 This is an exploded view of the connection between the first pulley and the rack of the present invention.

[0077] In the picture:

[0078] K1, rack; k2, first support; k3, second support; k31, front support; k32, rear support;

[0079] 2. Cutting blade transmission mechanism;

[0080] 210. Tool holder assembly; 211. Movable connecting joint; 212. Tool holder; 213. Tool sleeve; 214. Bearing;

[0081] 220. Knife clip;

[0082] 230. Tool holder fixing seat;

[0083] 240. Crank mechanism; 241. Rotary cam; 242. First crank connecting rod; 243. Second crank connecting rod;

[0084] 250. Swinging mechanism; 251. Swinging link; 252. Swinging seat; 253. Swinging groove;

[0085] 260. Tool clamping assembly; 261. Synchronizing pulley group; 262. First tool clamping block; 263. Tool clamping groove; 264. Cutting edge clamping wheel; 265. Side clamping wheel.

[0086] 3. Sharpening mechanism;

[0087] 310. Grinding wheel assembly; 311. First housing; 312. Grinding wheel; 313. Grinding edge; 314. Concave ring; 315. Flange; 316. Bevel gear assembly; 317. Sliding mechanism;

[0088] 320. Feed mechanism; 321. Mounting bracket; 322. Lead screw; 323. Slider; 324. Sensor;

[0089] 330. Reciprocating drive mechanism; 331. Rotating wheel; 332. Track; 333. Protrusion;

[0090] 4. Cutting knife;

[0091] 5. Double gear backlash adjustment mechanism;

[0092] 510. Guide rail; 511. Slider;

[0093] 520. Gear rack;

[0094] 530. Connecting plate;

[0095] 540. Pulley assembly; 541. First pulley; 542. Second pulley; 543. Belt; 544. Gear; 545. Gear shaft; 546. Locking mechanism; 547. Rotary seat; 548. Bearing;

[0096] 550. Tensioning mechanism; 551. Pressure roller; 552. Mounting base; 553. Slide rod; 554. Wheel seat; 555. First spring; 556. Second spring; 557. Adjusting nut; 558. Waist-shaped hole. Detailed Implementation

[0097] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0098] Example 1:

[0099] Please see Figure 1 and Figure 2This embodiment provides an automatic sharpening mechanical cutting bed, including a frame k1, a first support k2 slidably connected to the frame k1 along a first direction, and a second support k3 slidably connected to the first support k2 along a second direction. The second support k3 is provided with a cutting blade 4 and a cutting blade transmission mechanism 2 for driving the cutting blade 4 to move.

[0100] By sliding the frame k1, the first support k2, and the second support k3, the cutting blade can move horizontally. It is only necessary to set the sliding process between the frame k1, the first support k2, and the second support k3 according to the fabric cutting trajectory.

[0101] In this embodiment, a sharpening mechanism 3 is provided on the second support k2 to realize online automatic sharpening of the cutting knife.

[0102] For details, please refer to Figure 11 The grinding mechanism 3 includes a grinding wheel assembly 310, a feeding mechanism 320, and a reciprocating drive mechanism 330. These three parts are described below:

[0103] The sharpening wheel set 310 is used for sharpening cutting tools. Please refer to [reference needed]. Figure 12 and Figure 16 The grinding wheel assembly 310 includes a first housing 311 and two grinding wheels 312 rotatably mounted on the first housing 311.

[0104] The two sharpening wheels 312 are offset along the length of the cutting edge of the cutter, such as... Figure 13 As shown, the two grinding wheels 312 partially overlap in the plane of rotation to form a grinding opening 313 for the cutting edge of the cutting knife 4 to enter. Specifically, the two grinding wheels 312 rotate in opposite directions at the grinding opening 313, thereby forming grinding along the back of the knife towards the cutting edge.

[0105] like Figure 12 and Figure 16 As shown, a concave ring 314 is provided on the circumference of the grinding wheel 312, and a flange 315 is formed on both sides of the concave ring 314. One side flange 315 of the grinding wheel 312 is inserted into the concave ring 314 of the adjacent grinding wheel 312 to form a... Figure 13 The areas shown overlap. At the same time, a total of four flanges 315 on the two grinding wheels 312 are distributed sequentially along the blade height direction of the cutter 4, thereby achieving grinding of four adjacent areas on the blade at the same time.

[0106] To achieve the rotation of the grinding wheel 312, the grinding wheel assembly 310 further includes, for example, Figure 16The bevel gear set 316 is shown by the dashed circle. The bevel gear set 316 includes a first bevel gear (left side), and a second bevel gear (upper side) and a third bevel gear (lower side) that mesh with the first bevel gear. The first bevel gear is driven to rotate by a grinding motor. The second and third bevel gears are connected to two grinding wheels 312 via pulley sets and / or gear sets, respectively, ultimately forming two grinding wheels 312 rotating in opposite directions at the grinding edge 313.

[0107] The feeding mechanism 320 drives the sharpening wheels 310 to move toward or away from the cutting blade 4. Specifically, during normal fabric cutting, the feeding mechanism 320 drives the sharpening wheels 310 to move away from the cutting blade 4, separating the sharpening wheels 312 from the cutting blade 4 to avoid obstructing its cutting action. When the cutting blade 4 needs to be sharpened, the feeding mechanism 320 drives the sharpening wheels 310 toward the cutting blade 4, and the cutting edge of the cutting blade 4 enters the sharpening opening 313, causing the two sharpening wheels 312 to abut against the two sides of the cutting edge of the cutting blade 4.

[0108] It is worth mentioning that, to ensure that the sharpening wheel 312 can contact the cutting edge, in two consecutive feed cycles, the stroke of the later feed is greater than that of the previous feed, specifically 0.05mm to 0.1mm greater. The difference between the two strokes depends on the amount of grinding done by the sharpening wheel 310 on the cutting edge 4 of the cutting tool in a single pass and can be adjusted accordingly. According to experimental results, the optimal difference between the two feeds is 0.05mm, which ensures that the cutting edge is sharpened more thoroughly.

[0109] Specifically, such as Figure 14 As shown, the feed mechanism 320 includes a lead screw 322 and a slider 323. The lead screw 322 is rotatably mounted on the mounting bracket 321. The slider 323 is fixedly mounted on the first housing 311. The slider 323 is threadedly engaged with the lead screw 322. A motor drives the lead screw 322 to rotate, thereby driving the grinding wheel assembly 310 to move towards the cutting blade 4 along with the slider 323. It is worth mentioning that the mounting bracket 321 maintains a constant relative distance from the cutting blade 4 in the feed direction.

[0110] To control the feed stroke, the feed stroke must first be detected. In this embodiment, a sensor 324 for detecting the feed stroke of the grinding wheel assembly is provided on the slider 323. The sensor 324 can be an induction plate, an infrared rangefinder, or other rangefinder.

[0111] The working method of sensor 324 is as follows:

[0112] During two consecutive feed cycles, the sensor detects the first stroke of the previous feed and transmits it to the controller in the background. The controller adds a fixed value (such as 0.05mm) to the first stroke to obtain the second stroke, and in the next feed cycle, controls the feed mechanism to drive the grinding wheel assembly to feed the second stroke.

[0113] The reciprocating drive mechanism 330 is used to drive the grinding wheel assembly 310 to reciprocate along the blade length direction of the cutting knife 4, so that the grinding wheel assembly 310 reciprocates along the blade length direction of the cutting knife 4 to achieve a better grinding effect.

[0114] like Figure 12 and Figure 14 As shown, the reciprocating drive mechanism 330 includes a rotating wheel 331 and a protrusion 333. The rotating wheel 331 is driven to rotate by a reciprocating motor. A track 332 with a height difference along the length of the cutting edge of the cutter 4 is formed on the outer periphery of the rotating wheel 331. The protrusion 333 is fixedly mounted on the first housing 311 and slides in cooperation with the track 332. As the rotating wheel 331 rotates, the protrusion 333 slides along the track 332, resulting in a height difference, thereby driving the grinding wheel assembly 310 to reciprocate along the length of the cutting edge of the cutter 4.

[0115] It is worth mentioning that, in order to make the reciprocating motion of the grinding wheel assembly 310 more stable during the operation of the reciprocating drive mechanism 330, such as Figure 16 As shown, a sliding mechanism 317 is also provided on the first housing 311 of the grinding wheel assembly 310. The sliding mechanism 317 includes a sliding rail and a slider that are slidably engaged. In this embodiment, the slider is fixedly connected to the first housing 311, and the sliding rail and the mounting bracket 321 are jointly mounted on the second bracket k2 where the rear cutting blade 4 is located.

[0116] During the fabric cutting process, the cutting blade transmission mechanism 2 drives the cutting blade 4 to move at high speed along its length, thus cutting the fabric. It is worth noting that the high-speed movement of the cutting blade transmission mechanism 2 is not suitable for grinding; therefore, the cutting blade transmission mechanism 2 does not operate during the grinding process.

[0117] To accommodate the movement of the cutting blade 4 during the grinding process, the second support k3 is designed in two parts, such as... Figure 2 As shown, it includes a front support k31 and a rear support k32 that can slide relative to each other in the vertical direction (i.e., the length direction of the cutting blade). The front support k31 is used to set up the cutting blade and the cutting blade transmission mechanism that drives the cutting blade to move. The rear support k32 is slidably connected to the first support in a second direction.

[0118] In the dual-wheel grinding mechanism, the slide rail and mounting bracket 321 are jointly mounted on the rear bracket k32. During grinding, the grinding wheel 312 performs a small-stroke reciprocating motion relative to the rear bracket k32, while the front bracket k31 drives the cutting blade to perform a large-stroke reciprocating motion relative to the rear bracket k32. Under the combined action of the two, the grinding wheel 312 grinds the cutting edge of the cutting blade 4.

[0119] Example 2:

[0120] like Figure 3 As shown, this embodiment provides a highly stable cutting tool transmission mechanism, including:

[0121] Tool holder assembly 210;

[0122] The blade holder 220 is used to hold the cutting blade 4 and is located at the first end of the blade holder assembly 210.

[0123] The tool holder fixing seat 230 is slidably engaged with the tool holder assembly 210;

[0124] The crank mechanism 240 is used to drive the sliding of the cutter bar assembly 210 relative to the cutter bar fixing seat 230, thereby driving the lower cutting blade 4 to reciprocate along the sliding direction to cut the fabric at the cutting edge of the cutting blade 4.

[0125] All of the above components are mounted on the second support k3. The second support k3 can be set with corresponding tracks according to the fabric cutting trajectory to drive the sliding of the second support k3 and all the components mounted on it. A component that slides and cooperates with the aforementioned tracks can be set behind the second support k3 to achieve the above functions.

[0126] In the above solution, further improvements to the cutter shank assembly are needed to achieve the rotation of the cutting blade 4. Specifically:

[0127] Please refer to Figure 7 and Figure 8 The cutter bar assembly 210 includes a movable connecting joint 211 and a cutter bar 212. The movable connecting joint 211 is rotatably connected to the crank connecting rod at the end, and the cutter bar 212 is rotatably connected to the movable connecting joint 211 along its axial direction. This allows the crank mechanism 240 to drive the cutter bar 212 to move up and down without hindering the rotation of the cutter bar 212 and the cutting blade 4 clamped below. The cutter clamp 220 is fixedly connected to the lower end of the cutter bar 212.

[0128] To make the tool holder 212 rotate more smoothly, the tool holder assembly 210 also includes a tool sleeve 213. The tool sleeve 213 is disposed between the tool holder 212 and the tool holder fixing seat 230. The tool sleeve 213 and the tool holder 212 are rotatably connected via a bearing 214, and the tool sleeve 213 is slidably engaged with the tool holder fixing seat 230. The bearing 214 distributes the rotational and sliding movements to the tool holder 212 and the tool sleeve 213 respectively, further improving the smoothness of the tool holder rotation.

[0129] like Figure 4 and Figure 5 As shown, the crank mechanism 240 includes a plurality of crank connecting rods that are rotatably connected end to end in sequence, with the end crank connecting rod connected to the second end of the tool holder assembly. Specifically, the crank mechanism 240 includes a first crank connecting rod 242 and a second crank connecting rod 243 driven by a rotary cam 241, with the second crank connecting rod 243 connected to the second end of the tool holder assembly 210.

[0130] During the operation of the crank mechanism 240, vibration along the thickness direction of the cutting tool is inevitable due to the influence of machining accuracy. To reduce this vibration, this embodiment also includes a swing mechanism 250.

[0131] The swing mechanism 250 includes a swing groove 253, a swing connecting rod 521, and a swing seat 252. The swing groove 253 and the swing seat 252 are also disposed on the second bracket k3.

[0132] The middle portion of the swing linkage 251 is rotatably connected to one of the plurality of crank linkages (specifically, the middle portion of the second crank linkage 243). The first end of the swing linkage 251 is rotatably connected to the swing seat 252, and the second end is slidably engaged with the swing groove 253. It is worth noting that the sliding surface of the swing groove 253 is set parallel to the plane containing the blade of the cutting knife 4. Figure 4 and Figure 5 As shown, during the swinging of the crank connecting rod, the second end of the swing connecting rod 251 swings along the swing groove 253. In particular, the second crank connecting rod 243 is limited in the thickness direction of the blade, which reduces the vibration in this direction, thereby improving the neatness of the cut during the fabric cutting process.

[0133] To achieve automatic reversing, such as Figure 7 As shown, this embodiment provides a highly stable cutting blade transmission mechanism, which, based on the first embodiment, also includes a blade clamping assembly 260.

[0134] Please refer to Figure 9 and Figure 10The blade clamping assembly 260 includes a timing wheel set 261 disposed below the blade clamp 220 and a first blade clamping block 262 disposed on the timing wheel set 261. The first blade clamping block 262 has a blade clamping groove 263 that slides with the cutting blade 4.

[0135] It is worth mentioning that the clamping groove 263 opens towards the blade, allowing the back of the cutting blade 4 to slide along the clamping groove 263. During the cutting process, the clamping groove 263 does not obstruct the sliding of the cutting blade 4 along its length, but it does restrict the rotation of the cutting blade. When a change in direction is required, simply activating the motor to drive the synchronous pulley set 261 to rotate a certain angle will cause the blade of the cutting blade 4 to change direction accordingly.

[0136] The blade of the cutting knife 4 has a certain length, therefore, in this embodiment, the bottom, i.e., the tip, of the cutting knife 4 is also clamped. Specifically, the clamping assembly 260 further includes several clamping wheels that are in contact with the surface of the cutting knife. The clamping wheels include side clamping wheels 265 that are in contact with both sides of the blade of the cutting knife 4, and a blade clamping wheel 264 that is in contact with one side of the cutting edge of the cutting knife 4. Both the side clamping wheels 265 and the blade clamping wheel 264 are rotatably connected to a bracket below the first clamping block 262.

[0137] It is worth mentioning that the clamping groove 263 is located in the middle of the cutter 4, and the clamping wheel is located in the lower part of the cutter 4. In other embodiments, the positions of the clamping groove 263 and the clamping wheel can also be interchanged.

[0138] Example 3:

[0139] This embodiment provides a cutting bed with a highly stable cutting blade transmission mechanism. The technical solution is to add the cutting blade transmission mechanism of Embodiment 2 to the mechanical cutting bed of Embodiment 1. The specific details will not be repeated here.

[0140] Example 4:

[0141] Based on the first embodiment above, in order to improve the control accuracy of the cutting blade 4 during its movement, this embodiment improves the transmission between the frame k1 and the first support k2, and / or between the first support k2 and the second support k3, by adopting a double gear backlash adjustment mechanism.

[0142] like Figure 1 As shown, the example is a double gear backlash adjustment mechanism 5 set between the frame k1 and the first support k2.

[0143] like Figure 17 As shown, the dual-gear backlash adjustment mechanism includes:

[0144] Guide rail 510, with slider 520 slidingly fitted on guide rail 510;

[0145] The rack 520 is arranged parallel to the guide rail 510;

[0146] The connecting plate 530 is fixedly connected to the slider 520 and slides along the direction of the guide rail 510 with the slider 520.

[0147] The pulley assembly 540 is used to drive the movement of the connecting plate 530 and the slider 520. For example... Figure 18 and Figure 19 As shown, the pulley assembly 540 includes two first pulleys 541 rotatably mounted on the connecting plate 530, at least one second pulley 542, and a belt 543 that is sleeved on the outside of both the first pulleys 541 and the second pulley 542. One of the first pulleys 541 and the second pulley 542 is the driving pulley.

[0148] Preferably, the second pulley 542 is a drive pulley, mounted on the connecting plate 530 or the first bracket k2 on the top of the connecting plate 530, and a motor for driving the second pulley 542 to rotate is provided on the connecting plate 530.

[0149] Each first pulley 541 is rotatably equipped with a coaxial gear 544, and the two gears 544 mesh with the rack 520 respectively. The gear 544 is fixedly connected to a gear shaft 545, which is rotatably connected to the first pulley 541.

[0150] In order to lock the first pulley 541 and gear 544 and make them rotate synchronously, this embodiment also provides a locking mechanism 546.

[0151] When the locking mechanism 546 is in the unlocked state, the first pulley 541 and the gear 544 can rotate freely relative to each other. At this time, it can be as follows: Figure 19 As shown, the two gears 544 are rotated in opposite directions to adjust the meshing clearance between the gears 544 and the rack 520, ensuring they are tightly fitted and reducing the clearance. During adjustment, the rotation angle can be determined by measuring the torque on the gear shaft 545 using a torque wrench; for example, the torque could be 3.5 DaN. Then, the locking mechanism 546 switches to the locked state, locking the gears 544 and the first pulley 541, maintaining the adjusted meshing clearance. This improves the control accuracy of the connecting plate 530 relative to the rack 520.

[0152] Specifically, the locking mechanism 546 includes a tensioning sleeve, which is disposed between the first pulley 541 and the gear shaft 545.

[0153] To ensure the rotational performance of gear shaft 545, such as Figure 21 and Figure 22As shown, in this embodiment, a rotating assembly is provided between the gear shaft 545 and the connecting plate 530. The rotating assembly includes a rotating seat 547 fixedly installed on the connecting plate 530. The rotating seat 547 and the gear shaft 545 are rotatably connected via several bearings 548.

[0154] It is worth mentioning that, in order to install the bearing 548 into the rotating seat 547, the rotating seat 547 adopts a split structure, consisting of two parts, which are connected by bolts to form a cavity that can accommodate multiple bearings 548.

[0155] It is worth mentioning that the aforementioned guide rail 510 and rack 520 can be mounted on the frame k1, and the aforementioned connecting plate 530 is mounted on the first bracket k2. Through the above mechanism, the first bracket k2 can move relative to the frame k1, and the specific direction of the movement is determined by the direction of the guide rail 510 and rack 520.

[0156] In the above scheme, if the belt tension is insufficient, it will also cause belt slippage and tooth skipping during the operation of the pulley assembly, which will ultimately lead to inaccurate control precision of the transmission.

[0157] like Figure 17 , Figure 18 and Figure 20 As shown, to solve this problem, this embodiment provides a tensioning mechanism 550 based on the above solution. The tensioning mechanism 550 includes a pressure roller 551 that abuts against the belt 543, and a contact mechanism that maintains the pressure roller 551 abutting against the belt 543. The pressure roller 551 presses the belt 543 tight, increasing the tension of the belt 543 (e.g., 3.5 DaN or 4.0 DaN), thereby improving the transmission accuracy of the belt. Specifically, the pressure roller 551 abuts against the belt between the two first pulleys 541.

[0158] like Figure 20 As shown, the top contact mechanism includes a mounting base 552 fixedly mounted on a connecting plate 530. A slide rod 553 is slidably connected to the mounting base 552. The first end of the slide rod 553 is connected to a wheel seat 554 for mounting a pressure roller 551. The wheel seat 554 is rotatably connected to the pressure roller 551. An elastic element is sleeved on the outside of the slide rod 553 to provide elastic force to the wheel seat 554 and the pressure roller 551 towards the belt 543, thereby achieving the effect of keeping the pressure roller 551 in abutting state against the belt 543.

[0159] In this embodiment, in order to maintain the relative constant force of the elastic element, the elastic element includes a first spring 555 and a second spring 556. The first spring 555 and the second spring 556 are both compression springs, respectively sleeved on the outside of the slide rod 553 on both sides of the wheel seat 554.

[0160] Specifically, the two ends of the first spring 555 abut against the upper side of the wheel seat 552 and the lower side of the wheel seat 554 respectively (or they can be fixedly connected).

[0161] The first end of the second spring 556 abuts or is fixedly connected to the lower side of the wheel seat 552, and the second end abuts or is fixedly connected to the adjusting nut 557 at the second end of the slide rod 553. The adjusting nut 557 is threadedly engaged with the slide rod 553, and the extension and retraction state of the second spring 556 can be adjusted by adjusting the movement of the nut 557 on the slide rod 553, thereby adjusting the height of the pressure roller 551 and the tension of the belt 543.

[0162] It is worth mentioning that during the process of the pressure roller 551 pressing against the belt 543, the first pulley 541 and the gear 544, which is locked to the first pulley 541, are pulled by the belt 543, which can also achieve the same effect. Figure 18 and Figure 19 The rotation in the opposite direction shown further reduces the meshing clearance between gear 544 and rack 520.

[0163] Meanwhile, this embodiment also provides another adjustment structure for the tensioning mechanism 550. The mounting base 552 is provided with a waist-shaped hole 558 and a bolt. The bolt passes through the waist-shaped hole 558 and is threadedly connected to the connecting plate 530. When it is necessary to increase the tension of the belt, the bolt can be loosened, and then the mounting base 552 can be moved toward the belt 543 and the bolt can be tightened.

[0164] Example 5:

[0165] A method for zero backlash adjustment of a dual-gear transmission, employing the dual-gear backlash adjustment mechanism as described in Example 4, includes the following steps:

[0166] S1, set the first pulley 541 and gear 544 to a relative rotational state;

[0167] S2, the belt 543 is initially pressed against the part between the two first pulleys 541, so that the tension of the belt 543 reaches the first tension value;

[0168] S3, as Figure 18 As shown, adjust the two gears 544 to rotate in opposite directions until the torque of the gears reaches the first torque value, and switch the first pulley 541 and gear 544 to the synchronous locking state.

[0169] In the relative rotation state of the first pulley 541 and the gear 544, the two gears rotate in opposite directions, thereby reducing the gap between the two gears 544 and the rack 520, achieving the purpose of improving the control accuracy of the cutting knife movement, and thereby locking the first pulley 541 and the gear 544.

[0170] S4, press the belt 543 again between the two first pulleys 541 to make the tension of the belt 543 reach the second tension value.

[0171] The belt is tensioned twice: first tensioning before adjusting the torque of gear 544 and second tensioning after adjusting the torque of gear 544. During the second tensioning process, as the belt is tensioned, it will further drive the first pulley 541 and gear 544 to rotate in opposite directions, further reducing the gap between the two gears 544 and rack 520, and improving the control accuracy of the cutting knife movement.

[0172] On the other hand, the reason for using a double tensioning method is that the gap between gear 544 and rack 520 is small. If only one tensioning is performed, the deformation of belt 543 caused by the tensioning will cause further rotation of gear 544, which will further reduce the gap between the two gears 544 and rack 520. The tension force to adapt to this small gap is also very small and insufficient to achieve the second tension value we need.

[0173] The first tension value is 3.5 DaN to 4.0 DaN, and the second tension value is 4.0 DaN to 4.5 DaN. It is worth mentioning that the second tension value needs to be greater than the first tension value, and the difference can be 0.5 DaN.

[0174] The first torque value is preferably 3.5 DaN to 4.0 DaN.

[0175] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A mechanical cutting bed for automatic knife sharpening based on sensor detection, comprising a frame, a first support slidably connected to the frame along a first direction, and a second support slidably connected to the first support along a second direction, wherein a cutting blade and a cutting blade transmission mechanism for driving the cutting blade are disposed on the second support; characterized in that, The second support is equipped with a sharpening mechanism, which includes: Grinding wheel assembly; The feed mechanism is used to drive the grinding wheel assembly to move toward or away from the cutting tool; in two adjacent feed processes, the stroke of the later feed is greater than the stroke of the previous feed; The reciprocating drive mechanism is used to drive the grinding wheel assembly to reciprocate along the length of the cutting edge of the cutter. The feeding mechanism is equipped with a sensor and a controller for detecting the feed stroke of the grinding wheel assembly. In two adjacent feeding processes, the sensor detects the first stroke of the previous feeding and transmits it to the controller. The controller adds a fixed value to the first stroke to obtain the second stroke, and in the next feeding process, controls the feeding mechanism to drive the grinding wheel assembly to the second stroke. A dual-gear backlash adjustment mechanism is provided between the frame and the first support, the dual-gear backlash adjustment mechanism comprising: Guide rail, with a slider that slides on the guide rail; A rack is arranged parallel to the guide rail; The connecting plate is fixedly connected to the slider; The pulley assembly includes two first pulleys rotatably mounted on a connecting plate, at least one second pulley, and a belt that is sleeved on the outside of both the first and second pulleys; each first pulley is rotatably mounted with a coaxial gear, and the two gears mesh with the rack respectively; the gears are fixedly connected to a gear shaft, and the gear shaft is rotatably connected to the first pulley; A locking mechanism is used to lock the first pulley and gear, so that they rotate synchronously; The cutting blade transmission mechanism includes: Tool holder assembly; The cutter clip is used to hold the cutting knife and is located at the first end of the cutter shank assembly; The tool holder fixing seat slides in conjunction with the tool holder assembly; A crank mechanism is used to drive the sliding of the tool holder assembly relative to the tool holder fixed seat. The crank mechanism includes several crank connecting rods that are rotatably connected end to end in sequence, and the end crank connecting rod is connected to the second end of the tool holder assembly. The swing mechanism includes a swing groove, a swing connecting rod, and a swing seat; the middle part of the swing connecting rod is rotatably connected to one of the plurality of crank connecting rods; the first end of the swing connecting rod is rotatably connected to the swing seat, and the second end is slidably engaged with the swing groove; during the swinging process of the crank connecting rod, the second end of the swing connecting rod swings along the swing groove. The crank mechanism includes a first crank connecting rod and a second crank connecting rod driven by a rotary cam, the second crank connecting rod being connected to the second end of the tool holder assembly; the middle part of the swing connecting rod is rotatably connected to the middle part of the second crank connecting rod.

2. The automatic knife-grinding machine based on sensor detection according to claim 1, characterized in that, It includes a tensioning mechanism, which includes a pressure roller that abuts against the belt, and a top contact mechanism that maintains the pressure roller in contact with the belt.

3. The automatic knife-grinding machine based on sensor detection according to claim 2, characterized in that, The top contact mechanism includes a mounting base fixedly mounted on a connecting plate, a slide rod slidably connected to the mounting base, a wheel seat for mounting a pressure roller connected to the first end of the slide rod, and an elastic element provided with elastic force to the pressure roller toward the belt side is sleeved on the outside of the slide rod.

4. The automatic knife-grinding machine based on sensor detection according to claim 1, characterized in that, The sharpening wheel assembly includes two sharpening wheels that are offset along the length of the cutting edge of the cutter. The two sharpening wheels partially overlap to form a sharpening opening for the cutting edge of the cutter to enter. When the feeding mechanism drives the sharpening wheel assembly to move toward the cutter, the cutting edge of the cutter enters the sharpening opening, and the two sides of the cutting edge abut against the sharpening wheels on both sides of the sharpening opening.

5. The automatic knife-grinding machine based on sensor detection according to claim 1, characterized in that, The feeding mechanism includes a lead screw and a slider that is relatively fixed to the grinding wheel assembly in the feeding direction. The lead screw is rotatably mounted on the second bracket, and the slider is threadedly engaged with the lead screw.

6. The automatic knife-grinding machine based on sensor detection according to claim 1, characterized in that, The reciprocating drive mechanism includes a rotating wheel and a protrusion that is relatively fixed to the grinding wheel assembly along the length of the cutting blade; a track with a height difference along the length of the cutting blade is provided on the outer periphery of the rotating wheel, and the protrusion slides in cooperation with the track.

7. The automatic knife-grinding machine based on sensor detection according to claim 1, characterized in that, The second support includes a rear support and a front support that can slide relative to each other along the blade length direction of the cutter. The rear support is slidably connected to the first support along a second direction. The front support is provided with the cutter and a cutter transmission mechanism that drives the cutter to move. During the sharpening process, the front support slides relative to the rear support.

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