A chair webbing apparatus and webbing process

Abstract

The present application relates to the technical field of chair production, and particularly relates to a chair net feeling device and a net feeling process, which comprises a rack, a positioning mechanism and a net tightening mechanism, the positioning mechanism comprises a fixing assembly for fixing the chair, and two groups of limiting assemblies arranged on the rack and limiting the two side armrests correspondingly; the net tightening mechanism comprises a servo sliding table assembly capable of moving back and forth below the chair seat, a jacking assembly capable of moving up and down and moving with the servo sliding table assembly, a centering sliding table assembly symmetrically arranged on the jacking assembly and capable of moving left and right, and cloth clamping assemblies symmetrically arranged on two groups of sliding table plates a of the centering sliding table assembly; the two groups of cloth clamping assemblies are driven by the servo sliding table assembly to move forward, the centering sliding table assembly cooperates with the jacking assembly to make the net cloth unfold and cover the arc-shaped section at the front end of the chair seat, and cooperates with the net feeling tightness detection mechanism to solve the technical problem of poor net feeling effect of the arc-shaped section at the front end of the chair seat in the prior art.

Description

Technical Field

[0001] This invention relates to the field of chair manufacturing technology, and in particular to a chair upholstery equipment and upholstery process. Background Technology

[0002] Currently, most mainstream office mesh chairs on the market use mesh fabric in conjunction with the seat frame as the seat. The mesh fabric is taut and wrapped around the seat frame, and is secured to the seat frame using pressure strips, brad nails, fasteners, or other fasteners. However, in existing technology, the assembly process of tautly securing the mesh fabric to the seat frame is generally done manually. The operator first uses brad nails to connect the mesh fabric to one side of the seat frame; then, the mesh fabric is tightened, and while tightening the mesh fabric, it is connected to the other side of the seat frame. In this process, when initially connecting the mesh fabric to one side of the frame, it is relatively easy to connect the mesh fabric to the frame because the mesh fabric is still in a relatively loose state. However, in subsequent operations, when the mesh fabric needs to be further connected to the opposite side of the frame, the operator needs to exert considerable force to tighten the mesh fabric before connecting the end of the mesh fabric to the frame. Furthermore, during this process, the operator needs to hold the mesh fabric with one hand while using a tool (such as a nail gun) to connect the mesh fabric to the frame with the other. The operator must connect all the remaining mesh fabric in one go; otherwise, if the mesh fabric is only partially connected to the frame and then loosened, the connection will be weak, causing the mesh fabric, already connected with nails, to easily break under its own tension. In addition, due to limitations in worker experience and skill level, it is difficult to control the tightness and accuracy of the mesh fabric covering the frame, thus affecting the quality of the chair. Because the manual tension on the mesh fabric is uneven, the tension of the mesh fabric varies at different points after connection, affecting the mesh stretching effect. Therefore, the above-mentioned purely manual method of connecting the mesh fabric to the seat frame undoubtedly presents operational difficulties and a high degree of difficulty, significantly impacting assembly efficiency.

[0003] Chinese patent application CN202211026885.3 discloses a chair upholstery fabric process, comprising the following steps: S1: initially connecting the supporting mesh fabric to the frame body; connecting the supporting mesh fabric to the first side frame of the frame body; forming a connection end at the other end of the supporting mesh fabric to be connected to the second side frame; S2: installing the frame body in the auxiliary supporting mesh fabric connection device; positioning the frame body vertically between the positioning pressure plate and the support platform; S3: clamping and stretching the mesh fabric assembly to clamp the supporting mesh fabric located at the connection end; driving the lower positioning pressure block to rise and press against the upper positioning pressure block to clamp the supporting mesh fabric vertically; S4: driving the sliding support seat used to support the upper and lower positioning pressure blocks to move horizontally to stretch the supporting mesh fabric horizontally; S5: folding the connection end of the supporting mesh fabric upward and connecting it to the second side frame; S6: lowering and resetting the lower positioning pressure block, and removing the upper positioning pressure block from the sliding support seat; S7: removing the frame body from the frame positioning assembly.

[0004] However, for comfort, most chairs on the market have an arc-shaped front end. The above process can only stretch the support mesh horizontally, which results in poor coverage of the support mesh at the front of the chair, thus affecting the product quality of the chair. Summary of the Invention

[0005] To address the above problems, one objective of this invention is to provide a chair mesh covering device that addresses the shortcomings of existing technologies. This device uses a clamping assembly to clamp the two corners of the mesh fabric, and a servo slide assembly drives two sets of clamping assemblies to move forward. During the movement, the centering slide assembly, in conjunction with the lifting assembly, allows the mesh fabric to unfold and cover the arc-shaped section at the front end of the chair seat, thus solving the technical problem of poor mesh covering effect on the arc-shaped section at the front end of the chair seat in existing technologies.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A chair upholstery device, comprising:

[0008] A frame, the frame including a mounting platform and a top plate mounted thereon via columns;

[0009] The positioning mechanism includes a mesh panel station located between the mounting platform and the top plate and extending downward for placing the chair, a fixing component disposed above the mesh panel station for fixing the chair, and two sets of limiting components disposed on the mounting platform for corresponding contact and limiting of the armrests on both sides.

[0010] And a fabric stretching mechanism, the fabric stretching mechanism including a servo slide assembly that is disposed on the mounting platform and can move back and forth under the seat, a lifting assembly that moves with the servo slide assembly and can move up and down, a centering slide assembly that is disposed on the lifting assembly and symmetrically slidable left and right, and a fabric clamping assembly that is symmetrically distributed and respectively disposed on two sets of slide plates a of the centering slide assembly.

[0011] During the stretching of the netting, under the driving action of the servo slide assembly, the centering slide assembly drives the two sets of fabric clamping assemblies to move outward along the diagonal direction of the chair seat at the two corners of the netting. At the same time, the lifting assembly drives the centering slide assembly and the two sets of fabric clamping assemblies to cover the front arc-shaped area of ​​the chair seat with the netting.

[0012] As an improvement, the fixing assembly includes a mounting base disposed below the top plate, a positioning shaft disposed below the mounting base, a hydraulic cylinder mounted above the top plate, a moving beam disposed laterally on the power output end of the hydraulic cylinder, two sets of optical axes a symmetrically disposed at both ends of the moving beam and slidingly passing through the top plate via copper sleeves a, and a pull rod inserted at the bottom of both sets of optical axes a and located directly below the positioning shaft.

[0013] As an improvement, the limiting component includes a hollow limiting seat installed on the mounting platform, a limiting block that slides up and down within the limiting seat, and a cylinder a installed below the mounting platform and driving the limiting block to move up and down; the contact surface between the limiting block and the handrail is configured to conform to the outline of the handrail.

[0014] As an improvement, the servo slide assembly includes a slide plate b mounted on the mounting platform via a slide rail slider, a ball screw pair disposed below the slide plate b and driving the slide plate b to move, and a servo motor poweredly connected to the ball screw pair via a coupling.

[0015] As an improvement, the lifting assembly includes two sets of lifting units symmetrically arranged on the left and right sides of the slide plate b. Each lifting unit includes two sets of optical shafts b arranged front to back and passing through copper sleeves b on the slide plate b, a connecting plate arranged at the bottom of the two sets of optical shafts b, an abutting block protruding on one side of the connecting plate, a spring a correspondingly sleeved on the optical shaft b and located between the connecting plate and the copper sleeve b, a guide block mounted on the mounting platform, and a guide platform formed on the guide block and capable of abutting against the abutting block.

[0016] As an improvement, the centering slide assembly includes a slide base mounted on the top of the four sets of optical axes b and cooperating with the slide plate a through a dovetail groove; a two-way lead screw pair with positive and negative teeth that is transversely inserted into the slide base and drives the two sets of slide plates a to move synchronously; a gear coaxially mounted on the two-way lead screw pair with positive and negative teeth; a rack that is limited by two sets of pressure blocks and is slidably disposed in the middle position of the slide base and meshes with the gear; a cylinder mounting seat a disposed on the rear side of the slide base; a rodless cylinder disposed on the cylinder mounting seat a and connected to the rear end of the rack through a connecting seat; and a vertical plate disposed on the mounting platform and capable of abutting against the front end of the rack.

[0017] As an improvement, the fabric clamping assembly includes a fabric clamping seat positioned directly opposite the center of the chair seat, a hinged seat positioned at the top of the fabric clamping seat, a rotating plate hinged to the hinged seat, a pressure plate vertically positioned at the end of the rotating plate facing the fabric filling station and having a knurled fabric clamping surface, a friction table located on the side of the fabric clamping seat opposite the pressure plate and having a knurled surface, a lead block embedded in the pressure plate, a cylinder b positioned on the fabric clamping seat and located below the other end of the rotating plate relative to the pressure plate, and a top rod positioned at the power output end of the cylinder b and capable of abutting against the rotating plate.

[0018] As an improvement, the distance from the contact point between the top rod and the rotating plate to the hinge point of the rotating plate is greater than the distance from the fabric clamping surface of the pressure plate to the hinge point of the rotating plate.

[0019] As an improvement, a detection mechanism connected to the servo slide assembly is also included. The detection mechanism includes a cylinder mounting base b disposed on the mounting platform and located within the meshing station, a dual-axis cylinder mounted on the cylinder mounting base b, a horizontal plate disposed at the power end of the dual-axis cylinder, two sets of hollow rods disposed on the horizontal plate, a probe rod correspondingly sliding up and down through the hollow rod, a baffle disposed on the probe rod, a spring b sleeved on the probe rod and located between the baffle and the top of the hollow rod, and a sensor disposed on the lower side wall of the hollow rod and capable of sensing the bottom of the probe rod.

[0020] Another objective of this invention is to address the shortcomings of existing technologies by proposing a chair upholstery process. This process involves detecting the tightness of the mesh fabric after it has been upholstered on the chair seat using a detection component. Products with substandard mesh fabric tightness are then tightened again, thus solving the technical problem in existing technologies where the quality of the upholstery fabric cannot be inspected one by one.

[0021] A chair upholstery process includes the following steps:

[0022] Step 1: Loading and clamping. The operator places the chair, in which the mesh fabric and the chair seat are initially connected, into the mesh fabric station, aligns the positioning shaft with the center of the chair seat, places the two sets of armrests on the limiting components, and inserts the pull rod below the two sets of optical axes a. Under the driving action of the hydraulic cylinder, the positioning shaft is inserted into the middle position of the chair seat, and the pull rod, in conjunction with the mounting base, clamps the chair seat. The limiting components move to abut against the armrests.

[0023] Step 2: Mesh clamping. After step 1, the operator moves the rotating plate with one hand to lift the pressure plate, and places one corner of the mesh between the pressure plate and the friction table with the other hand. Then, the rotating plate is released, and the pressure plate falls naturally to press the mesh. After the two corners of the mesh are initially fixed, the cylinder b is activated, the push rod abuts against the rotating plate, and the pressure plate, together with the friction table, clamps the mesh.

[0024] Step 3: Netting. After step 2, the servo slide assembly drives the two sets of the fabric clamping assembly to move forward. During the movement, the centering slide assembly cooperates with the lifting assembly to allow the netting to unfold and cover the arc-shaped section at the front end of the chair seat.

[0025] Step 4: Inspection. After step 3, the stroke of the dual-axis cylinder moves to the end point, the two sets of probe rods contact the taut mesh and move downwards, and both sets of sensors are detected, indicating that the mesh is qualified; if only one of the two sets of sensors is detected or neither of them is detected, the signal is transmitted to the servo slide assembly, and step 2 is performed again.

[0026] Step 5: Material unloading. After step 4, the operator fixes the mesh and the chair seat. Then the oil cylinder, the air cylinder b, and the limiting component are reset. The pull rod is then pulled out, and the chair is taken out.

[0027] The beneficial effects of this invention are as follows:

[0028] (1) The present invention clamps the two corners of the mesh fabric with two sets of clamping components respectively. The servo slide component drives the two sets of clamping components to move forward. During the movement, the centering slide component cooperates with the lifting component to make the mesh fabric unfold and cover the arc section at the front end of the chair seat, thereby making the mesh fabric fit the arc section at the front end of the chair seat better, improving the mesh fabric efficiency and improving product quality.

[0029] (2) In this invention, after the mesh is completed, the inspection mechanism uses a sensor to sense the extension and retraction of the probe rod to detect the tightness of the mesh. For products that fail the inspection, the servo slide assembly, together with the centering slide assembly and the lifting assembly, tightens the mesh again on the original basis until the inspection mechanism detects that it is qualified. This method can simplify production and reduce labor costs, improve production efficiency and improve product quality.

[0030] (3) In this invention, the pressure plate and friction table in the clamping assembly make it easy to pick up and put down the edge of the mesh. When picking up and putting down, you only need to turn the rotating rod. The pressure plate is inlaid with lead blocks. When you manually put down the rotating rod, the pressure plate can move downward naturally to initially press it down. Then the cylinder b is activated to firmly fix the mesh using the lever principle. When removing it, you can directly pull the mesh away, which greatly improves the convenience of operation.

[0031] (4) The positioning accuracy of the chair in this invention is higher. The positioning shaft is used to position the chair seat. The two sets of limiting components are respectively positioned to abut against the two sets of armrests, which can effectively prevent the chair from twisting during the meshing process. At the same time, the existence of the limiting components and the positioning shaft can help workers find the correct placement position of the chair more quickly when loading materials, thereby improving the meshing efficiency.

[0032] (5) The meshing station in this invention makes the equipment suitable for meshing chairs with integrated seat and backrest, as well as for meshing individual chair seats, thereby improving the applicability of the equipment.

[0033] In summary, this invention has the advantages of simple structure, good meshing effect and high meshing efficiency, and is especially suitable for the field of chair manufacturing technology. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 This is a diagram of the chair frame.

[0036] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0037] Figure 4 This is a cross-sectional view of the limiting component;

[0038] Figure 5 This is a schematic diagram of the wire mesh tensioning mechanism.

[0039] Figure 6 Cross-sectional view of the mesh tensioning mechanism Figure 1 ;

[0040] Figure 7 Cross-sectional view of the mesh tensioning mechanism Figure 2 ;

[0041] Figure 8 This is a schematic diagram of the lifting unit structure;

[0042] Figure 9 This is a schematic diagram of the fabric clamping assembly structure;

[0043] Figure 10 This is a cross-sectional view of the fabric clamping assembly;

[0044] Figure 11 Diagram of the netting status Figure 1 ;

[0045] Figure 12 Diagram of the netting status Figure 2 ;

[0046] Figure 13 A schematic diagram of the testing organization;

[0047] Figure 14 This is a cross-sectional view of the testing facility;

[0048] Figure 15 This is a process flow diagram of the present invention.

[0049] In the diagram: Chair 100, Armrest 101, Seat 102, Mesh Fabric 103, Frame 1, Mounting Platform 11, Top Plate 12, Positioning Mechanism 2, Mesh Fabric Station 21, Fixing Component 22, Copper Sleeve a220, Mounting Base 221, Positioning Shaft 222, Hydraulic Cylinder 223, Moving Beam 224, Optical Axis a225, Tie Rod 226, Limiting Component 23, Limiting Seat 231, Limiting Block 232, Cylinder a233, Mesh Fabric Stretching Mechanism 3, Servo Slide Assembly 31, Slide Plate b311, Ball Screw Pair 312, Servo Motor 313, Lifting Assembly 32, Lifting Unit 321, Copper Sleeve b3210, Optical Axis b3211, Connecting Plate 3212, Contact Block 3213, Spring Spring a3214, guide block 3215, guide table 3216, centering slide assembly 33, slide plate a331, slide seat 332, bidirectional lead screw pair with positive and negative threads 333, gear 334, pressure block 335, rack 336, cylinder mounting seat a337, connecting seat 338, rodless cylinder 339, upright plate 330, fabric clamping assembly 34, fabric clamping seat 341, hinge seat 342, pressure plate 344, friction table 345, lead block 346, cylinder b347, top rod 348, rotating plate 349, detection mechanism 4, cylinder mounting seat b41, dual-axis cylinder 42, horizontal plate 43, two sets of hollow rods 44, detection rod 45, baffle 46, spring b47, sensor 48. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0051] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0053] Example 1:

[0054] like Figures 1-4 As shown, a chair upholstery device includes:

[0055] The frame 1 includes a mounting platform 11 and a top plate 12 mounted thereon via columns;

[0056] The positioning mechanism 2 includes a mesh support station 21 located between the mounting platform 11 and the top plate 12 and extending downward for placing the chair 100, a fixing component 22 disposed above the mesh support station 21 for fixing the chair 100, and two sets of limiting components 23 disposed on the mounting platform 11 for corresponding contact and limiting of the armrests 101 on both sides.

[0057] And a net stretching mechanism 3, the net stretching mechanism 3 includes a servo slide assembly 31 that is disposed on the mounting platform 11 and can move back and forth under the seat 102, a lifting assembly 32 that moves with the servo slide assembly 31 and can move up and down, a centering slide assembly 33 that is disposed on the lifting assembly 32 and symmetrically slidable left and right, and a fabric clamping assembly 34 that is symmetrically distributed and respectively disposed on two sets of slide plates a331 of the centering slide assembly 33;

[0058] During the stretching of the netting, under the driving action of the servo slide assembly 31, the centering slide assembly 33 drives the two sets of fabric clamping assemblies 34 to move outward along the diagonal direction of the chair seat 102 at the two corners of the netting 103. At the same time, the lifting assembly 32 uses the centering slide assembly 33 and the two sets of fabric clamping assemblies 34 to carry the netting 103 to cover the front arc-shaped area of ​​the chair seat 102.

[0059] It should be noted that the direction of movement of the mesh 103 is... Figure 11 and Figure 12 The two directions of motion in the process are superimposed simultaneously.

[0060] Furthermore, the fixing assembly 22 includes a mounting base 221 disposed below the top plate 12, a positioning shaft 222 disposed below the mounting base 221, a hydraulic cylinder 223 mounted above the top plate 12, a moving beam 224 horizontally disposed on the power output end of the hydraulic cylinder 223, two sets of optical axes a225 symmetrically disposed at both ends of the moving beam 224 and slidingly passing through the top plate 12 via copper sleeves a220, and a pull rod 226 simultaneously inserted at the bottom of the two sets of optical axes a225 and located directly below the positioning shaft 222.

[0061] It should be noted that a square hole is provided below the optical axis a225 for the pull rod 226 to pass through. The pull rod 226 is also square and passes through the gap of the seat 102. When the hydraulic cylinder 223 is activated, the pull rod 226 lifts the seat 102, and the positioning shaft 222 is inserted into the middle shaft hole of the seat 102 for positioning. The pull rod 226 makes the upper part of the seat 102 fit tightly against the mounting base 221. The square shape of the pull rod 226 has a large contact surface, which can reduce the shaking of the seat 102 and make it more firmly fixed.

[0062] Furthermore, the limiting component 23 includes a hollow limiting seat 231 installed on the mounting platform 11, a limiting block 232 slidably disposed within the limiting seat 231, and a cylinder a233 installed below the mounting platform 11 and driving the limiting block 232 to move up and down; the contact surface between the limiting block 232 and the handrail 101 is configured to conform to the outline of the handrail 101.

[0063] It should be noted that the central hole of the limiting seat 231 is square, and the limiting block 232 can move smoothly up and down inside it. When in use, grease is needed for lubrication between the two. It is not easy to shake when sliding inside. Moreover, this setting improves the cooperation strength between the limiting block 232 and the limiting block 231, which is beneficial for operators to use the cooperation between the handle 101 and the limiting block 232 for initial positioning when loading materials, thereby improving the efficiency and accuracy of loading.

[0064] It should also be noted that the contact surface between the top of the limiting block 232 and the armrest 101 is designed to mimic the contour of the armrest 101, thereby effectively preventing the chair 100 from twisting due to force during the process of touching the net.

[0065] It is worth mentioning that the cylinder a233 is an adjustable cylinder of the Qili Ke brand, which can adjust the end position of the limit block 232, thereby adjusting the resistance pressure and adapting to the handrail 101 of different heights.

[0066] Furthermore, such as Figure 1 and Figure 11 As shown, the servo slide assembly 31 includes a slide plate b311 mounted on the mounting platform 11 via a slide rail slider, a ball screw pair 312 disposed below the slide plate b311 and driving the slide plate b311 to move, and a servo motor 313 poweredly connected to the ball screw pair 312 via a coupling.

[0067] It should be noted that the ball screw assembly 312 and the slide rail slider are both from HIWIN, Taiwan, and the servo motor 313 is a 750W servo motor from Mitsubishi. The ball screw assembly 312 includes a screw body, bearing seats on both sides of the screw body to prevent axial movement, a screw nut screwed onto the screw body, a nut bracket sleeved on the outside of the screw nut and connected to the slide plate b311 by screws, and a washer placed between the slide plate b311 and the nut bracket. The washer needs to be ground to ensure that the screw will not bend under force after the ball screw assembly 312 is assembled, thus ensuring the smooth movement of the slide plate b311.

[0068] Furthermore, such as Figure 5 and Figure 8As shown, the lifting assembly 32 includes two sets of lifting units 321 symmetrically arranged on the left and right sides of the slide plate b311. Each lifting unit 321 includes two sets of optical shafts b3211 arranged front to back and passing through copper sleeves b3210 on the slide plate b311, a connecting plate 3212 arranged at the bottom of the two sets of optical shafts b3211, an abutting block 3213 protruding on one side of the connecting plate 3212, a spring a3214 correspondingly sleeved on the optical shaft b3211 and located between the connecting plate 3212 and the copper sleeve b3210, a guide block 3215 installed on the mounting platform 11, and a guide platform 3216 formed on the guide block 3215 and capable of abutting against the abutting block 3213.

[0069] It should be noted that, in order to improve the service life of the guide platform 3216 and the guide block 3215, the contact positions of both are hardened. The outline of the guide platform 3216 is consistent with the arc-shaped outline of the front end of the chair seat 102. Thus, when the guide block 3215 moves against the outline of the guide platform 3216, it can drive the mesh fabric 103 to fit completely against the front end of the chair seat 102, ensuring the quality of the mesh fabric.

[0070] It should also be noted that the spring a3214 makes the descent of the lifting unit 321 more stable and faster.

[0071] It is worth mentioning that both copper sleeve a220 and copper sleeve b3210 are self-lubricating copper sleeves, which improves the smoothness of the corresponding optical axis movement.

[0072] Furthermore, such as Figures 5 to 7 As shown, the centering slide assembly 33 includes a slide base 332 mounted on the top of the four sets of optical axes b3211 and cooperating with the slide plate a331 through a dovetail groove; a two-way lead screw pair 333 with positive and negative teeth that is transversely inserted into the slide base 332 and drives the two sets of slide plates a331 to move synchronously; a gear 334 coaxially mounted on the two-way lead screw pair 333; a rack 336 that is limited and slidably disposed in the middle position of the slide base 332 by two sets of pressure blocks 335 and meshes with the gear 334; a cylinder mounting seat a337 disposed on the rear side of the slide base 332; a rodless cylinder 339 disposed on the cylinder mounting seat a337 and connected to the rear end of the rack 336 through a connecting seat 338; and a vertical plate 330 disposed on the mounting platform 11 and capable of abutting against the front end of the rack 336.

[0073] It should be noted that, in order to ensure the rigidity of the centering slide assembly 33, both the slide plate a331 and the slide base 332 are made of cast iron, and the dovetail groove contact surfaces of both are scraped. During use, there must be lubricating grease between them so that the slide plate a331 can move smoothly.

[0074] It should also be noted that the bidirectional lead screw assembly 333, which is of the Taiwanese brand HIWIN, ensures the stability of the movement of the two sets of slide plates a331. It includes a lead screw body, two sets of bearing seats at both ends of the lead screw body that can limit the axial movement of the lead screw body, a positive thread nut and a negative thread nut that are screwed on the lead screw body, a nut bracket that is sleeved on the outside of the corresponding lead screw nut and connected to the slide plate a331 by screws, and a washer placed between the slide plate a311 and the nut bracket. The washer needs to be ground before use. In order to prevent the lead screw from bending under force after the bidirectional lead screw assembly 333 is assembled, the smoothness of the movement of the slide plate a331 is guaranteed.

[0075] It is important to note that the front end of the rack 336 abuts against the vertical plate 330. The rack 336 drives the gear 334 to rotate, which in turn rotates the lead screw body and drives the two sets of slide plates a331 to move. When the equipment is working normally, after the rack 336 abuts against the vertical plate 330, the rack 336 will rub upward along the surface of the vertical plate 330. Therefore, the contact positions of the vertical plate 330 and the rack 336 need to be hardened, and the teeth of the rack 336 and the gear 334 are also hardened.

[0076] It should be further explained that, since the rear end of the rack 336 is connected to the rodless cylinder 339 through the connecting seat 338, in order to ensure that the rack 336 can move smoothly after it comes into contact with the upright plate 330, the rodless cylinder 339 is controlled by a three-position five-way central leakage solenoid valve. After the meshing work is completed, when the rack 336 is in its final position, the rodless cylinder 339 drives the rack 336 to reset.

[0077] It is worth mentioning that the present invention uses the rodless cylinder 339 to reduce the overall length of the centering slide assembly 33, which facilitates its operation under the seat 102. In order to ensure the stability of the rodless cylinder 339 driving the rack 336, the rodless cylinder 339 is a rodless cylinder with a guide rod from the brand Airlink.

[0078] Furthermore, such as Figure 9 and Figure 10As shown, the fabric clamping assembly 34 includes a fabric clamping seat 341 positioned directly opposite the center of the chair seat 102, a hinge seat 342 positioned at the top of the fabric clamping seat 341, a rotating plate 349 hinged to the hinge seat 342, a pressure plate 344 vertically positioned at one end of the rotating plate 349 facing the fabric upholstery station 21 and with a knurled fabric clamping surface, a friction table 345 located on the side of the fabric clamping seat 341 opposite the pressure plate 344 and with a knurled surface, a lead block 346 embedded in the pressure plate 344, a cylinder b347 positioned on the fabric clamping seat 341 and located below the other end of the rotating plate 349 relative to the pressure plate 344, and a push rod 348 positioned at the power output end of the cylinder b347 and capable of contacting the rotating plate 349.

[0079] It should be noted that the main reason why the fabric clamping seat 341 is directly opposite the center of the chair seat 102 is that there is an angle between the fabric clamping seat 341 and the moving direction of the servo slide assembly 31. This arrangement is more conducive to the unfolding and clamping of the mesh fabric 103 without affecting the loading and unloading of the chair 100.

[0080] It should also be noted that the lead block 346 embedded on the pressure plate 344 allows the pressure plate 344 to contact the friction table 345 in its natural state. When clamping the mesh 103, simply move the rotating plate 349 to lift the pressure plate 344, then place the mesh 103 in, and then release the rotating plate 349. The pressure plate 344 will fall naturally and initially clamp the mesh 103. When removing the mesh 103, it can be pulled out without being clamped.

[0081] It is worth mentioning that the cylinder b347 is from the brand Qilike; the contact points between the pressure plate 344 and the friction table 345 and the mesh 103 are all knurled to increase friction and prevent the mesh 103 from sliding.

[0082] Furthermore, the distance from the contact point between the top rod 348 and the rotating plate 349 to the hinge point of the rotating plate 349 is greater than the distance from the fabric clamping surface of the pressure plate 344 to the hinge point of the rotating plate 349.

[0083] It should be noted that the hinge point of the rotating plate 349 utilizes the lever principle to improve the clamping effect of the pressure plate 344.

[0084] Example 2:

[0085] like Figure 11 , Figure 13 and Figure 14As shown, a chair upholstery device further includes a detection mechanism 4 signal-connected to the servo slide assembly 31. The detection mechanism 4 includes a cylinder mounting base b41 disposed on the mounting platform 11 and located within the upholstery station 21, a dual-axis cylinder 42 mounted on the cylinder mounting base b41, a horizontal plate 43 disposed at the power end of the dual-axis cylinder 42, two sets of hollow rods 44 disposed front and rear on the horizontal plate 43, a probe rod 45 correspondingly sliding through the hollow rods 44, a baffle 46 disposed on the probe rod 45, a spring b47 sleeved on the probe rod 45 and located between the baffle 46 and the top of the hollow rod 44, and a sensor 48 disposed on the lower side wall of the hollow rod 44 and capable of sensing the bottom of the probe rod 45.

[0086] It should be noted that the dual-axis cylinder 42 is from the brand "Qili Ke". During testing, when the stroke of the dual-axis cylinder 42 reaches its limit, the probe rod 45 contacts the mesh fabric 103, and the probe rod 45 will move downwards. The bottom of the probe rod 45 is sensed by the sensor 48. If the mesh is too loose, the downward movement distance of the probe rod 45 will decrease, and the sensor 48 will not generate a signal. In this case, the mesh is unqualified. At this time, the servo slide assembly 33 drives the two sets of the clamping assembly 34 to move forward again. The lifting assembly 32 moves in coordination with the centering slide assembly 33 to stretch the mesh again. After stretching, the test is performed again. When the mesh is normal, the probe rod 45 moves downwards normally, and the signal from the sensor 48 can sense the bottom of the probe rod 45.

[0087] It should also be noted that the detection results are more accurate when the two sets of probe rods 45 are used for detection.

[0088] It is worth mentioning that the re-stretching stroke of the substandard products is small, and the components involved in the stretching process all have a margin.

[0089] Example 3:

[0090] like Figure 15 As shown, this embodiment provides a chair upholstery process, which uses a chair upholstery device from Embodiments 1 and 2, and includes the following steps:

[0091] Step 1: Loading and clamping. The operator places the chair 100, in which the mesh fabric 103 and the chair seat 102 are initially connected, into the mesh fabric station 21. The positioning shaft 222 is aligned with the center of the chair seat 102. The two sets of armrests 101 are placed on the limiting component 23. The pull rod 226 is inserted below the two sets of optical shafts a225. Under the driving action of the hydraulic cylinder 223, the positioning shaft 222 is inserted into the middle position of the chair seat 102. The pull rod 226, in conjunction with the mounting base 221, clamps the chair seat 102. The limiting component 23 moves to abut against the armrests 101.

[0092] Step Two: Mesh Fabric Clamping. After Step One, the operator uses one hand to move the rotating plate 349 to lift the pressure plate 344, and uses the other hand to place one corner of the mesh fabric 103 between the pressure plate 344 and the friction table 345. Then, the rotating plate 349 is released, and the pressure plate 344 falls naturally to press the mesh fabric 103. After the two corners of the mesh fabric 103 are initially fixed, the cylinder b347 is activated, the push rod 348 abuts against the rotating plate 349, and the pressure plate 344, in conjunction with the friction table 345, clamps the mesh fabric 103.

[0093] Step 3: Netting. After step 2, the servo slide assembly 31 drives the two sets of the cloth clamping assemblies 34 to move forward. During the movement, the centering slide assembly 33 cooperates with the lifting assembly 32 to allow the netting 103 to unfold and cover the arc-shaped section at the front end of the chair seat 102.

[0094] Step 4: Inspection. After step 3, the stroke of the dual-axis cylinder 42 moves to the end point, the two sets of probe rods 45 contact the taut mesh 103 and move downwards, both sets of sensors 48 are detected, and the mesh 103 is qualified; if only one of the two sets of sensors 48 is detected or neither of them is detected, the signal is transmitted to the servo slide assembly 31, and step 3 is performed again.

[0095] Step 5: Material unloading. After step 4, the operator fixes the mesh 103 and the seat 102. Then, the hydraulic cylinder 223, the air cylinder b347 and the limiting component 23 are reset, the pull rod 226 is pulled out, and then the chair 100 is taken out.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A chair upholstery device, characterized in that, include The frame (1) includes a mounting platform (11) and a top plate (12) mounted thereon via columns. The positioning mechanism (2) includes a mesh work station (21) located between the mounting platform (11) and the top plate (12) and extending downward for placing the chair (100), a fixing component (22) set above the mesh work station (21) for fixing the chair (100), and two sets of limiting components (23) set on the mounting platform (11) for correspondingly abutting and limiting the armrests (101) on both sides. The fixing component (22) includes a mounting seat set below the top plate (12). (221) A positioning shaft (222) is provided below the mounting base (221), a hydraulic cylinder (223) is installed above the top plate (12), a moving beam (224) is arranged laterally on the power output end of the hydraulic cylinder (223), two sets of optical shafts a (225) are symmetrically arranged at both ends of the moving beam (224) and slide through the top plate (12) via copper sleeves a (220), and a pull rod (226) is inserted at the bottom of the two sets of optical shafts a (225) and located directly below the positioning shaft (222); The mesh tensioning mechanism (3) includes a servo slide assembly (31) mounted on the mounting platform (11) and capable of reciprocating back and forth under the seat (102), a lifting assembly (32) that moves with the servo slide assembly (31) and can move up and down, a centering slide assembly (33) mounted on the lifting assembly (32) and symmetrically sliding left and right, and a fabric clamping assembly (34) symmetrically distributed and respectively mounted on two sets of slide plates a (331) of the centering slide assembly (33). The fabric clamping assembly (34) includes a fabric clamping seat (341) positioned directly opposite the center of the seat (102) and a hinge seat (341) mounted on the top of the fabric clamping seat (341). 42) A rotating plate (349) hinged to the hinge seat (342), a pressure plate (344) vertically arranged on the rotating plate (349) facing the meshing station (21) and with knurled fabric surface, a friction table (345) located on the side of the fabric clamping seat (341) facing the pressure plate (344) and with knurled surface, a lead block (346) embedded on the pressure plate (344), a cylinder b (347) arranged on the fabric clamping seat (341) and located below the other end of the rotating plate (349) relative to the pressure plate (344), and a push rod (348) arranged at the power output end of the cylinder b (347) and able to abut against the rotating plate (349). During the stretching of the net, under the driving action of the servo slide assembly (31), the centering slide assembly (33) drives the two sets of the fabric clamping assemblies (34) to move the two corners of the net fabric (103) outward along the diagonal direction of the chair seat (102), while the lifting assembly (32) drives the centering slide assembly (33) and the two sets of the fabric clamping assemblies (34) to cover the front arc-shaped area of ​​the chair seat (102) with the net fabric (103); The detection mechanism (4) is signal connected to the servo slide assembly (31). The detection mechanism (4) includes a cylinder mounting seat b (41) set on the mounting platform (11) and located in the meshing station (21), a dual-axis cylinder (42) mounted on the cylinder mounting seat b (41), a horizontal plate (43) set on the power end of the dual-axis cylinder (42), two sets of hollow rods (44) set on the horizontal plate (43) front and rear, a probe rod (45) correspondingly sliding through the hollow rod (44), a baffle (46) set on the probe rod (45), a spring b (47) sleeved on the probe rod (45) and located between the baffle (46) and the top of the hollow rod (44), and a sensor (48) set on the lower side wall of the hollow rod (44) and can be sensed at the bottom of the probe rod (45).

2. The chair upholstery device according to claim 1, characterized in that, The limiting component (23) includes a hollow limiting seat (231) installed on the mounting platform (11), a limiting block (232) slidably disposed in the limiting seat (231), and a cylinder a (233) installed below the mounting platform (11) and driving the limiting block (232) to move up and down; the contact surface between the limiting block (232) and the handrail (101) is set in accordance with the outline of the handrail (101).

3. The chair upholstery device according to claim 1, characterized in that, The servo slide assembly (31) includes a slide plate b (311) mounted on the mounting platform (11) via a slide rail slider, a ball screw pair (312) located below the slide plate b (311) and driving the slide plate b (311) to move, and a servo motor (313) poweredly connected to the ball screw pair (312) via a coupling.

4. A chair upholstery device according to claim 3, characterized in that, The lifting assembly (32) includes two sets of lifting units (321) symmetrically arranged on the left and right sides of the slide plate b (311). The lifting unit (321) includes two sets of optical shafts b (3211) arranged front and back and passing through copper sleeves b (3210) on the slide plate b (311), a connecting plate (3212) arranged at the bottom of the two sets of optical shafts b (3211), an abutting block (3213) protruding on one side of the connecting plate (3212), a spring a (3214) correspondingly sleeved on the optical shaft b (3211) and located between the connecting plate (3212) and the copper sleeve b (3210), a guide block (3215) installed on the mounting platform (11), and a guide platform (3216) formed on the guide block (3215) and abutting against the abutting block (3213).

5. A chair upholstery device according to claim 4, characterized in that, The centering slide assembly (33) includes a slide base (332) mounted on the top of the four sets of optical axes b (3211) and engaged with the slide plate a (331) through a dovetail groove; a two-way lead screw pair (333) with positive and negative teeth that is transversely inserted into the slide base (332) and drives the two sets of slide plates a (331) to move synchronously; a gear (334) coaxially mounted on the two-way lead screw pair (333); and a sliding front and back limiter by two sets of pressure blocks (335). A rack (336) is disposed in the middle of the slide base (332) and meshes with the gear (334); a cylinder mounting seat a (337) is disposed on the rear side of the slide base (332); a rodless cylinder (339) is disposed on the cylinder mounting seat a (337) and communicates with the rear end of the rack (336) through a connecting seat (338); and a vertical plate (330) is disposed on the mounting platform (11) and can abut against the front end of the rack (336).

6. A chair upholstery device according to claim 1, characterized in that, The distance from the contact point between the top rod (348) and the rotating plate (349) to the hinge point of the rotating plate (349) is greater than the distance from the fabric clamping surface of the pressure plate (344) to the hinge point of the rotating plate (349).

7. A chair upholstery process, wherein the upholstery process employs the chair upholstery equipment described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Loading and clamping. The operator places the chair (100) in the mesh station (21) where the mesh fabric (103) and the chair seat (102) are initially connected. The positioning shaft (222) is aligned with the center of the chair seat (102). The two sets of armrests (101) are placed on the limiting component (23). The pull rod (226) is inserted under the two sets of optical axes a (225). Under the driving action of the hydraulic cylinder (223), the positioning shaft (222) is inserted into the middle position of the chair seat (102). The pull rod (226) cooperates with the mounting seat (221) to clamp the chair seat (102). The limiting component (23) moves to abut against the armrest (101). Step 2: Mesh clamping. The operator moves the rotating plate (349) with one hand to lift the pressure plate (344), and places one corner of the mesh (103) between the pressure plate (344) and the friction table (345) with the other hand. Then, the rotating plate (349) is released, and the pressure plate (344) falls naturally to press the mesh (103). After the two corners of the mesh (103) are initially fixed, the cylinder b (347) is activated, the push rod (348) abuts against the rotating plate (349), and the pressure plate (344) cooperates with the friction table (345) to clamp the mesh (103). Step 3: Netting, the servo slide assembly (31) drives the two sets of the clamping assemblies (34) to move forward. During the movement, the centering slide assembly (33) cooperates with the lifting assembly (32) to make the netting (103) unfold and cover the arc-shaped section at the front end of the chair seat (102). Step 4: Detection. When the stroke of the dual-axis cylinder (42) reaches the end point, the two sets of probe rods (45) contact the taut mesh (103) and move downwards. Both sets of sensors (48) are detected, and the mesh (103) is qualified. If only one of the two sets of sensors (48) is detected or neither of them is detected, the signal is transmitted to the servo slide assembly (31), and the process of step 3 is repeated. Step 5: Material unloading. The operator fixes the mesh (103) and the seat (102). Then the oil cylinder (223), the air cylinder b (347) and the limiting component (23) are reset. Then the pull rod (226) is pulled out and the chair (100) is taken out.

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