Differential adjustment device

Abstract

The present invention relates to a differential adjustment device, comprising a housing, a fabric feeding mechanism, a differential amount adjustment mechanism, a presser foot mechanism, a stitch detection module and a control module. The presser foot mechanism is used to press the fabric conveyed by the fabric feeding mechanism, and the differential amount adjustment mechanism is used to adjust the swing amplitude of the differential fabric feeding tooth frame so as to adjust the differential ratio between the driving tooth and the differential tooth. By providing the stitch detection module, the differential amount adjustment mechanism and the control module, the stitch detection module can detect the position and height of the stitch on the fabric in advance and transmit the data of the position and height of the stitch to the control module. The control module automatically controls the differential amount adjustment mechanism according to the received data to adjust the differential ratio between the driving tooth and the differential tooth, meet the differential ratio required for the stitch, and enable the sewing mechanism to sew stitches with uniform stitch density before and after sewing the stitch, so as to achieve the effect of uniform and stable stitch density.

Description

Technical Field

[0001] The present invention relates to the technical field of sewing machines, and particularly to a differential adjustment device. Background Art

[0002] The working principle of existing sewing machines is that the needle bar drives the lead wire to pass through the curved needle with winding thread at the bottom of the fabric under the drive of the driving device, so that the lead wire and the winding thread are intertwined to achieve sewing. Given the special working principle of existing sewing machines, they have the advantages of fast sewing speed, good sewing quality, convenient operation, etc., and are deeply favored by people and widely used in the fields of clothing, home furnishing, etc.

[0003] The differential adjustment device of a sewing machine is a mechanism for adjusting to complete the fabric feeding function and adapt to various fabrics. It mainly adjusts the feeding speed and feeding distance of the driving teeth and the differential teeth to overcome the deformation caused by the sliding or shortening of the upper and lower layers of the fabric, especially suitable for sewing various slippery and elastic sewing materials. However, the current differential adjustment device is a mechanical differential adjustment. When sewing special fabrics, it cannot quickly adjust the differential ratio between the driving teeth and the differential teeth to meet the sewing process requirements, and the stitch lengths before and after the sewing stem are different during the sewing process, affecting the sewing effect. Summary of the Invention

[0004] Based on this, it is necessary to provide a differential adjustment device that can achieve automatic control and can make the sewing mechanism sew stitches with uniform stitch lengths before and after passing through the sewing stem, so as to achieve the effect of uniform and stable stitch lengths.

[0005] A differential adjustment device includes:

[0006] A housing;

[0007] A fabric feeding mechanism, the fabric feeding mechanism is arranged on the housing, the fabric feeding mechanism includes a driving fabric feeding tooth rack and a differential fabric feeding tooth rack, a driving tooth for dragging the fabric is arranged on the driving fabric feeding tooth rack, and a differential tooth for dragging the fabric is arranged on the differential fabric feeding tooth rack;

[0008] A differential amount adjustment mechanism, the differential amount adjustment mechanism includes a differential driving part and a differential transmission component, the differential driving part is connected to the differential fabric feeding tooth rack through the differential transmission component, and the differential driving part is used to adjust the swing amplitude of the differential fabric feeding tooth rack to adjust the differential ratio between the driving tooth and the differential tooth;

[0009] A presser foot mechanism, the presser foot mechanism is arranged on the housing, and the presser foot mechanism is used to press the fabric conveyed by the fabric feeding mechanism;

[0010] A passing-over-stem detection module, which is used to detect the passing-over-stem of the fabric to pass through the presser foot mechanism.

[0011] A control module, which is communicatively connected to the passing-over-stem detection module and controllably connected to the driving part. The control module is used to drive the differential driving part to operate according to the passing-over-stem information of the fabric detected by the passing-over-stem detection module.

[0012] By providing a fabric feeding mechanism and a presser foot mechanism, the presser foot mechanism can press the fabric conveyed by the fabric feeding mechanism; by providing a passing-over-stem detection module, a differential amount adjustment mechanism and a control module, the passing-over-stem detection module can detect the position and height of the passing-over-stem of the fabric in advance, and transmit the data of the position and height of the passing-over-stem to the control module. The control module automatically controls the differential amount adjustment mechanism according to the received data to adjust the swing amplitude of the differential fabric feeding tooth rack, so as to adjust the differential ratio between the main tooth and the differential tooth, so as to meet the differential ratio required for passing over the stem, and can ensure that the sewing mechanism can sew stitches with uniform stitch density before and after passing over the stem, so as to achieve the effect of uniform and stable stitch density.

[0013] In one embodiment, the differential adjustment device further includes a main shaft and a main driving mechanism. The main fabric feeding tooth rack and the differential fabric feeding tooth rack are respectively eccentrically sleeved on the main shaft. The main driving mechanism drives the main shaft to operate, and the operation of the main shaft can drive the main fabric feeding tooth rack and the differential fabric feeding tooth rack to reciprocate in the first direction at the same time.

[0014] In one embodiment, the fabric feeding mechanism further includes a fabric feeding shaft, a differential fabric feeding crank and a first transmission component. The differential fabric feeding crank is sleeved on the fabric feeding shaft and is synchronously linked with the fabric feeding shaft. The first end of the differential fabric feeding crank is connected to the main shaft through the first transmission component, and the second end of the differential fabric feeding crank is connected to the differential fabric feeding tooth rack. The differential fabric feeding crank can drive the differential fabric feeding tooth rack to reciprocate in the second direction under the drive of the first transmission component.

[0015] In one embodiment, a first sliding groove is formed on the differential fabric feeding tooth rack. The differential transmission component includes a differential slider, a differential adjustment part and a crank arm formed on the differential fabric feeding crank. The differential slider is slidably connected in the first sliding groove. An embedding part is formed on the differential slider for being embedded in the first sliding groove and relatively not disengaging. A receiving hole for accommodating the crank arm is formed on the differential slider. The crank arm passes through the receiving hole. The differential driving part is connected to the differential slider through the differential adjustment part for adjusting the position of the differential slider relative to the first sliding groove to adjust the position of the connection point between the differential fabric feeding crank and the differential fabric feeding tooth rack.

[0016] In one embodiment, the differential adjustment part includes a differential crank and a differential connecting rod. The first end of the differential crank is connected to the differential driving part, the second end of the differential crank is hinged to the first end of the differential connecting rod, and the second end of the differential connecting rod is hinged to the differential slider.

[0017] In one embodiment, the feeding shaft is connected to the active feeding tooth rack through a second transmission assembly, and is used to drive the active feeding tooth rack to reciprocate along a second direction.

[0018] In one embodiment, the presser foot mechanism includes a presser foot limiting assembly and a presser foot shaft. The first end of the presser foot shaft is installed on the housing and can rotate relative to the housing. The presser foot limiting assembly is connected to the presser foot shaft and is used to limit the rotation of the presser foot shaft.

[0019] In one embodiment, the presser foot mechanism further includes a presser foot bracket, a presser foot and a presser foot driving part. The first end of the presser foot bracket is hinged to the second end of the presser foot shaft, the second end of the presser foot bracket is connected to the presser foot, and the presser foot driving part is connected to the presser foot bracket and is used to drive the presser foot bracket to rotate.

[0020] In one embodiment, the presser foot includes a support body and a movable body. A closed accommodation space is formed in the support body, the movable body is movably connected in the accommodation space, and one end of the movable body extends out of the accommodation space and is located above the fabric.

[0021] In one embodiment, the over-stem detection module is arranged inside the accommodation space and is used to detect the movement amplitude of the movable body.

[0022] In the above solution, by providing a feeding mechanism and a presser foot mechanism, the presser foot mechanism can press the fabric conveyed by the feeding mechanism; by providing an over-stem detection module, a differential amount adjustment mechanism and a control module, the over-stem detection module can detect the position and height of the fabric over the stem in advance, and transmit the data of the position and height of the over-stem to the control module. The control module automatically controls the differential amount adjustment mechanism according to the received data to adjust the swing amplitude of the differential feeding tooth rack, so as to adjust the differential ratio between the active tooth and the differential tooth to meet the differential ratio required for over-stem, and can ensure that the sewing mechanism can sew stitches with uniform stitch density before and after sewing over the stem, so as to achieve the effect of uniform and stable stitch density. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0025] Figure 1 Structural schematic diagram of the differential adjustment device shown in an embodiment of the present invention;

[0026] Figure 2 Structural schematic diagram of the presser foot mechanism shown in an embodiment of the present invention;

[0027] Figure 3 Structural schematic diagram of the cloth feeding mechanism shown in an embodiment of the present invention;

[0028] Figure 4 Structural schematic diagram of the connection between the cloth feeding mechanism and the differential amount adjustment mechanism shown in an embodiment of the present invention;

[0029] Figure 5 Partial structural schematic diagram of the cloth feeding mechanism and the differential amount adjustment mechanism shown in an embodiment of the present invention;

[0030] Figure 6 Partial structural schematic diagram of the cloth feeding mechanism shown in an embodiment of the present invention;

[0031] Figure 7 Exploded structural schematic diagram of the main shaft and the first transmission component shown in an embodiment of the present invention.

[0032] Explanation of reference numerals

[0033] 10. differential adjustment device; 100. housing; 200. cloth feeding mechanism; 210. active cloth feeding tooth frame; 211. active tooth; 220. differential cloth feeding tooth frame; 221. differential tooth; 222. first sliding groove; 230. main shaft; 231. eccentric shaft section; 240. transmission part; 241. second sliding groove; 242. cloth feeding slider; 250. cloth feeding shaft; 260. differential cloth feeding crank; 270. first transmission assembly; 271. fixed wheel; 272. cloth feeding eccentric wheel; 273. cloth feeding connecting rod; 274. driving wheel; 275. eccentric cam; 280. second transmission assembly; 281. active cloth feeding crank; 282. active cloth feeding connecting rod; 283. connecting part; 284. third sliding movable groove; 300, differential amount adjustment mechanism; 310, differential drive unit; 320, differential transmission assembly; 321, differential slider; 3211, embedded unit; 3212, slider connection unit; 322, differential adjustment unit; 3221, differential crank; 3222, differential connecting rod; 323, crank arm; 400, presser foot mechanism; 410, presser foot shaft; 420, presser foot bracket; 430, presser foot; 431, supporting body; 432, movable body; 433, presser foot plate; 440, presser foot limiting assembly; 441, first connecting member; 442, second connecting member; 443, connecting rod; 444, limiting member; 4441, limiting groove; 450, presser foot drive unit; 500, over-stem detection module. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] In addition, 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0037] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0039] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0040] See Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, one embodiment of the present application relates to a differential adjustment device 10, including a housing 100, a cloth feeding mechanism 200, a differential amount adjustment mechanism 300, a presser mechanism 400, a stem passing detection module 500 and a control module. The cloth feeding mechanism 200, the differential amount adjustment mechanism 300, the presser mechanism 400, the stem passing detection module 500 and the control module are all connected to the housing 100. The cloth feeding mechanism 200 is used to transport cloth, and the cloth feeding mechanism 200 includes an active cloth feeding tooth frame 210 and a differential cloth feeding tooth frame 220. The differential amount adjustment mechanism 300 is used to adjust the swing amplitude of the differential cloth feeding tooth frame 220. The presser mechanism 400 is used to press the cloth transported by the cloth feeding mechanism 200. The stem passing detection module 500 is used to detect the stem passing of the cloth to be passed through the presser mechanism 400. The control module is used to realize automatic control. The control module can adopt PLC or MCS-51 single chip microcomputer.

[0041] See also Figure 1 , Figure 2 and Figure 5 As shown, the cloth feeding mechanism 200 also includes a main shaft 230, a main driving mechanism and a sewing mechanism. The main shaft 230, the main driving mechanism and the sewing mechanism are all arranged inside the housing 100. The active cloth feeding tooth frame 210 and the differential cloth feeding tooth frame 220 are eccentrically sleeved on the main shaft 230 respectively. The main driving mechanism drives the main shaft 230 to operate. The rotation of the main shaft 230 can simultaneously drive the active cloth feeding tooth frame 210 and the differential cloth feeding tooth frame 220 to reciprocate along the first direction to transport the cloth. The sewing mechanism is used to sew the cloth transported by the cloth feeding mechanism 200.

[0042] The main shaft 230 includes an eccentric shaft section 231 that is eccentrically arranged. The active feed tooth frame 210 and the differential feed tooth frame 220 are respectively connected to the eccentric shaft section 231 through the transmission part 240. The rotation of the main shaft 230 will drive the eccentric shaft section 231 to eccentrically revolve around the central axis of the main shaft 230. The eccentric revolving of the eccentric shaft section 231 transmits power to the active feed tooth frame 210, the differential feed tooth frame 220, and the presser foot mechanism 400 through the transmission part 240, thereby realizing the driving operation of the active feed tooth frame 210 and the differential feed tooth frame 220.

[0043] Specifically, the structure of the transmission part 240 for enabling the rotation of the main shaft 230 to drive the main feed dog bracket 210 and the differential feed dog bracket 220 to reciprocate in the first direction is as follows: The transmission part 240 includes a second sliding groove 241 provided on the main feed dog bracket 210 and the differential feed dog bracket 220, and a feed dog slider 242 eccentrically sleeved on the main shaft 230 and slidably connected in cooperation with the second sliding groove 241. The eccentric shaft section 231 of the main shaft 230 is rotatably inserted into the feed dog slider 242. The feed dog slider 242 and the wall surface of the second sliding groove 241 are in surface contact and fit. More specifically, the feed dog slider 242 has a square structure, and a circular hole eccentrically arranged on the central axis of the main shaft 230 is provided in the middle. When the main shaft 230 rotates, the main feed dog bracket 210 and the differential feed dog bracket 220 are driven to reciprocate in the first direction through the eccentric part of the eccentrically arranged main shaft 230 and the feed dog slider 242. The first direction is the vertical direction.

[0044] See Figure 3 As shown, a main dog 211 for dragging the fabric is provided on the main feed dog bracket 210. The main dog 211 has a serrated surface to increase the dragging force on the fabric. A differential dog 221 for dragging the fabric is provided on the differential feed dog bracket 220. The differential dog 221 also has a serrated surface to increase the dragging force on the fabric. The main dog 211 and the differential dog 221 are spaced apart from each other. The sewing mechanism is used to process the fabric in the gap between the main dog 211 and the differential dog 221, thereby completing the sewing operation.

[0045] See Figures 3 to 7 As shown, the feed mechanism 200 further includes a feed shaft 250, a differential feed crank 260, and a first transmission component 270. The feed shaft 250 is arranged in parallel with the main shaft 230. The feed shaft 250 is arranged inside the housing 100 and is rotatably connected to the housing 100. The differential feed crank 260 is sleeved on the feed shaft 250 and is synchronously linked with the feed shaft 250. The first end of the differential feed crank 260 is connected to the main shaft 230 through the first transmission component 270. The second end of the differential feed crank 260 is connected to the differential feed dog bracket 220. The differential feed crank 260 can drive the differential feed dog bracket 220 to reciprocate in the second direction under the drive of the first transmission component 270. The first direction intersects with the second direction. The second direction is the horizontal direction.

[0046] Specifically, the first transmission assembly 270 includes a fixed wheel 271, a feed eccentric wheel 272, a feed connecting rod 273, a driving wheel 274, and an eccentric cam 275. The driving wheel 274 and the fixed wheel 271 are both fixedly connected to the main shaft 230 and are synchronously linked with the main shaft 230. The fixed wheel 271 is connected between the feed eccentric wheel 272 and the feed slider 242. The feed eccentric wheel 272 is formed with a first protruding portion, and the driving wheel 274 has a second protruding portion. The second protruding portion of the driving wheel 274 is sleeved inside the first protruding portion of the feed eccentric wheel 272. And the feed eccentric wheel 272 and the driving wheel 274 are synchronously linked. The first end of the feed connecting rod 273 is sleeved on the first protruding portion of the feed eccentric wheel 272 and is rotatably connected to the feed eccentric wheel 272. The second end of the feed connecting rod 273 is hinged to the first end of the differential feed crank 260. The eccentric cam 275 is sleeved on the main shaft 230 and is used to make the driving wheel 274 fixed relative to the feed eccentric wheel 272 and the main shaft 230. When the main shaft 230 rotates, it can drive the feed eccentric wheel 272 to rotate synchronously. Under the action of the eccentric cam 275, the rotation of the main shaft 230 can also drive the feed connecting rod 273 to swing. The feed connecting rod 273 can drive the feed shaft 250 and the differential feed rack 220 to be synchronously linked through the differential feed crank 260, and further realize that the differential feed crank 260 drives the differential feed rack 220 to reciprocate along the second direction.

[0047] See Figures 3 to 6 As shown, the feed shaft 250 is connected to the main feed rack 210 through a second transmission assembly 280 and is used to drive the main feed rack 210 to reciprocate along the second direction. Specifically, the second transmission assembly 280 includes a main feed crank 281 and a main feed connecting rod 282. The first end of the main feed crank 281 is sleeved on the feed shaft 250 and is synchronously linked with the feed shaft 250. The second end of the main feed crank 281 is connected to the main feed rack 210 through the main feed connecting rod 282.

[0048] More specifically, the first end of the main feed connecting rod 282 is hinged to the main feed rack 210. A connecting portion 283 protrudes from the second end of the main feed connecting rod 282. A third sliding groove 284 is formed at the second end of the main feed crank 281. The connecting portion 283 is guidingly slidably connected in the third sliding groove 284. When the feed shaft 250 rotates, the main feed crank 281 and the feed shaft 250 are synchronously linked. The main feed crank 281 can drive the main feed rack 210 to reciprocate along the second direction through the main feed connecting rod 282.

[0049] It should be understood that when the cloth feeding shaft 250 rotates, the driving cloth feeding crank 281 and the differential cloth feeding crank 260 are both synchronously linked with the cloth feeding shaft 250, so that the driving cloth feeding crank 281 and the differential cloth feeding crank 260 have the same power source, thereby enabling the driving cloth feeding tooth frame 210 and the differential cloth feeding tooth frame 220 to move synchronously, and avoiding the problem that multiple power sources drive the driving cloth feeding tooth frame 210 and the differential cloth feeding tooth frame 220 respectively, resulting in asynchronous movement along the second direction.

[0050] Refer to Figures 3 to 6 As shown, the differential amount adjusting mechanism 300 includes a differential driving part 310 and a differential transmission assembly 320. The differential driving part 310 is connected to the differential cloth feeding tooth frame 220 through the differential transmission assembly 320. The differential driving part 310 is used to adjust the swing amplitude of the differential cloth feeding tooth frame 220 to adjust the differential ratio between the driving tooth 211 and the differential tooth 221. The differential driving part 310 uses a motor.

[0051] A first sliding groove 222 is formed on the differential cloth feeding tooth frame 220. The differential transmission assembly 320 includes a differential slider 321, a differential adjusting part 322, and a crank arm 323 formed on the differential cloth feeding crank 260. The differential slider 321 is slidably connected in the first sliding groove 222. An embedding part 3211 is formed on the differential slider 321 for being able to be embedded in the first sliding groove 222 and relatively not disengaged. A receiving hole for receiving the crank arm 323 is formed on the differential slider 321. The crank arm 323 passes through the receiving hole. The differential driving part 310 is connected to the differential slider 321 through the differential adjusting part 322, and is used to adjust the position of the differential slider 321 relative to the first sliding groove 222 to adjust the position of the connection point between the differential cloth feeding crank 260 and the differential cloth feeding tooth frame 220, thereby changing the swing amplitude of the differential cloth feeding tooth frame 220 and realizing the adjustment of the differential ratio between the driving tooth 211 and the differential tooth 221.

[0052] Specifically, the differential adjusting part 322 includes a differential crank 3221 and a differential connecting rod 3222. The first end of the differential crank 3221 is connected to the differential driving part 310, the second end of the differential crank 3221 is hinged to the first end of the differential connecting rod 3222, and the second end of the differential connecting rod 3222 is hinged to the differential slider 321. More specifically, a slider connecting part 3212 is formed on the differential slider 321. The second end of the differential connecting rod 3222 is hinged to the slider connecting part 3212.

[0053] The differential drive unit 310 operates, and the differential drive unit 310 drives the differential adjustment unit 322 to operate, so as to drive the differential slider 321 to move along the length direction of the first sliding groove 222. The length direction of the first sliding groove 222 is the vertical direction. It should be understood that the length direction of the crank arm 323 is the same as the length direction of the first sliding groove 222. Therefore, when the differential slider 321 moves along the length direction of the first sliding groove 222, the differential slider 321 also moves along the length direction of the crank arm 323.

[0054] When the differential slider 321 moves up or down relative to the crank arm 323, the position of the connection point between the differential feed crank 260 and the differential feed tooth frame 220 also changes accordingly, so as to adjust the differential ratio between the main tooth 211 and the differential tooth 221. For example, when the differential slider 321 moves up relative to the crank arm 323, the length of the differential feed crank 260 from the connection point between the differential feed crank 260 and the differential feed tooth frame 220 becomes longer, and the swing amplitude of the differential feed crank 260 becomes larger. Therefore, the swing amplitude of the differential feed crank 260 driving the differential feed tooth frame 220 in the second direction becomes larger, making the differential ratio between the main tooth 211 and the differential tooth 221 larger. Similarly, when the differential slider 321 moves down relative to the crank arm 323, the differential ratio between the main tooth 211 and the differential tooth 221 becomes smaller.

[0055] See Figure 1 and Figure 2 As shown, the presser foot mechanism 400 is used to press the fabric conveyed by the feeding mechanism 200. The presser foot mechanism 400 includes a presser foot shaft 410, a presser foot bracket 420, a presser foot 430, a presser foot limiting component 440 and a presser foot driving part 450. The first end of the presser foot shaft 410 is installed on the housing 100 and can rotate relative to the housing 100. The second end of the presser foot shaft 410 is hinged to the first end of the presser foot bracket 420. The second end of the presser foot bracket 420 is detachably connected to the presser foot 430. The presser foot limiting component 440 is used to limit the rotation of the presser foot shaft 410. The presser foot driving part 450 is connected to the presser foot bracket 420 and is used to drive the presser foot bracket 420 to rotate, so as to adjust the installation angle of the presser foot bracket 420. The presser foot bracket 420 is used to support the presser foot 430. The presser foot driving part 450 uses a cylinder.

[0056] Specifically, the presser foot 430 includes a support body 431, a movable body 432 and a presser foot plate 433 fixedly connected to the support body 431. A closed accommodation space is formed inside the support body 431. The movable body 432 is movably connected inside the accommodation space. One end of the movable body 432 extends out of the accommodation space and is located above the fabric. The sewing mechanism has a sewing table. The end of the movable body 432 extending out of the accommodation space is located above the sewing table of the sewing mechanism and has a gap with the sewing table. This gap facilitates the fabric on the sewing table to pass through.

[0057] When the fabric passes over the ridge, the moving body 432 moves due to the contact between the fabric and the moving body 432, causing a relative displacement between the moving body 432 and the supporting main body 431. The amplitude of the movement of the moving body 432 is associated with the height of the fabric passing over the ridge. The contact surface between the end of the moving body 432 extending out of the accommodation space of the supporting main body 431 and the fabric is an arc surface.

[0058] More specifically, a hinge shaft is formed inside the supporting main body 431. The moving body 432 is provided with a hinge hole that movably cooperates with the hinge shaft, and the moving body 432 can swing up and down around the hinge shaft. It should be understood that the arc surface of the moving body 432 always abuts against the contact surface of the fabric. When the fabric passes over the ridge, the moving body 432 swings upward around the hinge shaft under the action of the fabric. After the fabric passes over the ridge, the moving body 432 swings downward around the hinge shaft under its own weight.

[0059] See Figure 1 and Figure 2 As shown in, the presser foot limiting assembly 440 includes a first connecting member 441 fixedly connected to the end of the first end of the presser foot shaft 410, a second connecting member 442 hinged to the housing 100, a connecting rod 443 connected between the first connecting member 441 and the second connecting member 442, and a limiting member 444. The limiting member 444 is used to limit the rotation of the second connecting member 442. The limiting member 444 is fixedly connected to the housing 100, and a limiting groove 4441 is formed on the limiting member 444. The second end of the second connecting member 442 extends into the limiting groove 4441 and can abut against the two side walls of the limiting groove 4441. It should be understood that the rotation range of the second connecting member 442 depends on the length of the limiting groove 4441.

[0060] See Figure 1 、 Figure 2 and Figure 3 As shown in, the over-ridge detection module 500 is used to detect the over-ridge of the fabric to pass through the presser foot mechanism 400. The control module is communicatively connected to the over-ridge detection module 500 and is controllably connected to the differential drive unit 310. The control module is used to drive the differential drive unit 310 to operate according to the over-ridge of the fabric detected by the over-ridge detection module 500, so as to adjust the differential ratio between the driving tooth 211 and the differential tooth 221, so as to enable the sewing mechanism to sew a stitch with a uniform stitch pitch before and after sewing over the ridge, so as to achieve the effect of uniform and stable stitch pitch. It should be understood that the end of the moving body 432 extending out of the accommodation space of the supporting main body 431 is located at the front end of the presser foot plate 433. The fabric first passes through the moving body 432 and then through the presser foot plate 433. The over-ridge detection module 500 can detect in advance the over-ridge of the fabric to pass under the presser foot plate 433.

[0061] Specifically, the over-stem detection module 500 is disposed inside the accommodation space and is used to detect the magnitude of the movement of the movable body 432. The over-stem detection module 500 includes a detection element and a detected element. The detection element is fixedly connected inside the accommodation space of the support main body 431. The detected element is fixedly connected to the movable body 432, and the detected element is disposed opposite to the detection element. The detection element is communicatively connected to the control module. When the movable body 432 moves, it drives the detected element to displace relative to the detection element. The detection element detects the displacement information of the detected element and transmits the displacement information to the control module. The control module automatically controls the differential drive unit 310 according to this information.

[0062] More specifically, the detection element can be a Hall sensor, and the detected element can be a magnet. By changing the relative position between the magnet and the Hall sensor, different voltage value signals can be generated. The Hall sensor then correspondingly identifies and outputs different detection signals to the control module to achieve the identification of the change in the fabric passing over the stem.

[0063] When the differential adjustment device 10 of the present invention is in use, the over-stem detection module 500 detects in real time the over-stem of the fabric to pass through the presser foot mechanism 400 and transmits the data to the control module. The control module controls the operation of the differential drive unit 310 according to the received data.

[0064] Among them, when the over-stem detection module 500 detects that the over-stem height of the fabric is equal to the set value, the active feed dog 211 on the active feed dog holder 210 and the differential feed dog 221 on the differential feed dog holder 220 have the same movement amplitude, and the active feed dog 211 and the differential feed dog 221 are flush with each other. The control module does not act.

[0065] When the over-stem detection module 500 detects that the over-stem height of the fabric is greater than the set value, the control module controls the differential drive unit 310 to operate. The differential drive unit 310 drives the differential adjustment unit 322 to operate, so as to drive the differential slider 321 to move upward along the length direction of the crank arm 323. The length of the differential feed crank 260 from the connection point of the differential feed crank 260 and the differential feed dog holder 220 becomes longer, and the swing amplitude of the differential feed crank 260 driving the differential feed dog holder 220 in the second direction becomes larger, so that the differential ratio between the active feed dog 211 and the differential feed dog 221 becomes larger.

[0066] It should be understood that the increase in the swing amplitude of the differential feed crank 260 driving the differential feed dog holder 220 in the second direction makes the feeding efficiency of the differential feed dog 221 higher than that of the active feed dog 211. Therefore, when the active feed dog 211 and the differential feed dog 221 feed the fabric, the differential feed dog 221 has a certain chasing effect relative to the active feed dog 211, forming a pushing effect on the fabric, so that the sewing mechanism can sew a stitch with a uniform stitch pitch before and after sewing over the stem, so as to achieve the effect of uniform and stable stitch pitch.

[0067] It is more necessary to understand that the change in the magnitude of the differential ratio matches the over-stem height detected by the over-stem detection module 500. The higher the over-stem, the greater the rotation angle of the differential drive unit 310 and the greater the differential ratio. It can meet the stable sewing of different over-stem heights and ensure the stitch effect.

[0068] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0069] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A differential adjustment device, characterized in that, Comprising: A housing; A cloth feeding mechanism, which is arranged on the housing. The cloth feeding mechanism includes a main cloth feeding tooth frame and a differential cloth feeding tooth frame. A main tooth for dragging the cloth is arranged on the main cloth feeding tooth frame, and a differential tooth for dragging the cloth is arranged on the differential cloth feeding tooth frame; A differential amount adjusting mechanism, which includes a differential driving part and a differential transmission component. The differential driving part is connected to the differential cloth feeding tooth frame through the differential transmission component. The differential driving part is used to adjust the swing amplitude of the differential cloth feeding tooth frame to adjust the differential ratio between the main tooth and the differential tooth; A presser foot mechanism, which is arranged on the housing. The presser foot mechanism is used to press the cloth conveyed by the cloth feeding mechanism; A passing stem detection module, which is used to detect the passing of the cloth passing through the presser foot mechanism; A control module, which is communicatively connected to the passing stem detection module and controllably connected to the driving part. The control module is used to drive the differential driving part to operate according to the passing stem information of the cloth detected by the passing stem detection module; 2. The differential adjustment device according to claim 1, wherein It further includes a main shaft and a main driving mechanism. The main cloth feeding tooth frame and the differential cloth feeding tooth frame are respectively eccentrically sleeved on the main shaft. The main driving mechanism drives the main shaft to rotate, and the rotation of the main shaft can drive the main cloth feeding tooth frame and the differential cloth feeding tooth frame to reciprocate in a first direction at the same time; 3. The differential adjustment device according to claim 1, characterized in that, The cloth feeding mechanism further includes a cloth feeding shaft, a differential cloth feeding crank and a first transmission component. The differential cloth feeding crank is sleeved on the cloth feeding shaft and is synchronously linked with the cloth feeding shaft. The first end of the differential cloth feeding crank is connected to the main shaft through the first transmission component, and the second end of the differential cloth feeding crank is connected to the differential cloth feeding tooth frame. The differential cloth feeding crank can drive the differential cloth feeding tooth frame to reciprocate in a second direction under the drive of the first transmission component; 4. The differential adjustment device according to claim 3, characterized in that, A first sliding groove is formed on the differential cloth feeding tooth frame. The differential transmission component includes a differential slider, a differential adjusting part and a crank arm formed on the differential cloth feeding crank. The differential slider is slidably connected in the first sliding groove. An embedding part for being embedded in the first sliding groove and relatively not disengaging is formed on the differential slider. A receiving hole for receiving the crank arm is formed on the differential slider. The crank arm passes through the receiving hole. The differential driving part is connected to the differential slider through the differential adjusting part and is used to adjust the position of the differential slider relative to the first sliding groove to adjust the position of the connection point between the differential cloth feeding crank and the differential cloth feeding tooth frame; 5. The differential adjustment device according to claim 4, characterized in that, The differential adjusting part includes a differential crank and a differential connecting rod. The first end of the differential crank is connected to the differential driving part, the second end of the differential crank is hinged to the first end of the differential connecting rod, and the second end of the differential connecting rod is hinged to the differential slider; 6. The differential adjustment device according to claim 3, wherein, The cloth feeding shaft is connected to the main cloth feeding tooth frame through a second transmission component and is used to drive the main cloth feeding tooth frame to reciprocate in a second direction.

7. The differential adjustment device according to claim 1, characterized in that, The presser foot mechanism includes a presser foot limiting component and a presser foot shaft. The first end of the presser foot shaft is installed on the housing and can rotate relative to the housing. The presser foot limiting component is connected to the presser foot shaft and is used to limit the rotation of the presser foot shaft.

8. The differential adjustment device according to claim 7, wherein The presser foot mechanism further includes a presser foot bracket, a presser cloth foot, and a presser foot driving part. The first end of the presser foot bracket is hinged to the second end of the presser foot shaft. The second end of the presser foot bracket is connected to the presser cloth foot. The presser foot driving part is connected to the presser foot bracket and is used to drive the presser foot bracket to rotate.

9. The differential adjustment device according to claim 8, wherein The presser cloth foot includes a support main body and a movable body. A closed accommodation space is formed inside the support main body. The movable body is movably connected inside the accommodation space. One end of the movable body extends out of the accommodation space and is located above the fabric.

10. The differential adjustment device according to claim 9, characterized in that, The over-stem detection module is arranged inside the accommodation space and is used to detect the magnitude of the movement amplitude of the movable body.

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