Differential adjusting mechanism, multi-section differential adjusting device and sewing machine

Abstract

The utility model relates to a differential adjusting mechanism, a multi-section differential adjusting device and a sewing machine, the differential adjusting mechanism comprises a differential indicating plate, a differential wrench, a differential wrench shaft and a connecting rod assembly, the differential indicating plate is used for being fixedly connected to a machine shell, and the differential wrench shaft is used for being rotatably connected to the machine shell; the differential wrench is fixedly connected to the differential wrench shaft and is connected with the differential indicator board, the mounting position of the differential wrench on the differential indicator board can be adjusted, and the differential wrench shaft is driven to rotate; the connecting rod assembly comprises a conversion crank and a small connecting rod 145, one end of the conversion crank is fixedly connected to the differential wrench shaft, the other end of the conversion crank is hinged to one end of the small connecting rod, and the other end of the small connecting rod is used for being hinged to the differential adjusting sliding block. In this way, the number of parts needed for transmission between the differential wrench shaft and the differential adjusting sliding block can be reduced, the effects of reducing cost and facilitating installation are achieved, and the stability of power transmission is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field related to the differential ratio adjustment of sewing machines, and particularly relates to a differential adjustment mechanism, a multi-stage differential adjustment device and a sewing machine. Background Art

[0002] In existing sewing machines, the feed dog is fixedly connected to the feed dog bracket, and the differential dog is fixedly connected to the differential dog bracket. The main shaft is connected to the feed dog bracket and the differential dog bracket through a lifting mechanism, a feeding mechanism and a differential mechanism. The main shaft drives the feed dog bracket to swing left and right through the feeding mechanism, the feed dog cooperates with the movement of the feed dog bracket, and the differential mechanism drives the differential dog bracket to swing left and right, and the differential dog cooperates with the movement of the differential dog bracket. Moreover, the main shaft drives the feed dog bracket and the differential dog bracket to reciprocate up and down in the vertical direction through the lifting mechanism to realize the feeding action of the fabric. And, the actual stitch length during sewing is mainly determined by the movement conditions of the feed dog and the differential dog, and the movement distance ratio between the differential dog and the feed dog, that is, the differential ratio, can adjust the flatness of the fabric during sewing. For different processes and product patterns, the flatness of the fabric to be sewn is different. Some processes require the fabric to be flat, while some processes require the sewn fabric to have wrinkles. This requires adjusting the movement amounts of the feed dog and the differential dog in the sewing machine to obtain the required stitch length and flatness.

[0003] Currently, in existing sewing machines, the differential wrench lever piece is fixed on the differential wrench shaft. The differential wrench shaft is connected to the conversion crankshaft through a differential conversion crank, a differential adjustment link and a differential connection crank. The conversion crankshaft is connected to the differential adjustment slider through a link. The differential adjustment slider can slide on the differential crank. By rotating the differential wrench lever piece, the position of the hinge joint between the conversion crank and the link can be adjusted, thereby adjusting the differential ratio. However, the above differential adjustment mechanism has too many parts, not only the cost is high, but also the installation angles of the differential conversion crank and the differential connection crank need to be adjusted during installation, which is inconvenient for installation. In addition, there are easily gaps between the parts, resulting in the differential dog shaking during operation, and further resulting in unstable stitch. Summary of the Utility Model

[0004] In view of this, it is necessary to provide a differential adjustment mechanism, a multi-stage differential adjustment device and a sewing machine for solving the above technical problems.

[0005] A differential adjustment mechanism is applied to a sewing machine. The differential adjustment mechanism includes:

[0006] A differential indicating plate for fixedly connecting to the machine housing;

[0007] A differential wrench shaft for rotatably connecting to the machine housing;

[0008] A differential wrench is fixedly connected to the differential wrench shaft and connected to the differential indicating plate. Moreover, the installation position of the differential wrench on the differential indicating plate can be adjusted, and it drives the differential wrench shaft to rotate;

[0009] A connecting rod assembly includes a conversion crank and a small connecting rod. One end of the conversion crank is fixedly connected to the differential wrench shaft, the other end of the conversion crank is hinged to one end of the small connecting rod, and the other end of the small connecting rod is used for hinging a differential adjustment slider.

[0010] It can be understood that the conversion crank and the small connecting rod are used to realize the transmission between the differential wrench shaft and the differential adjustment slider. In this way, the transmission between the differential wrench shaft and the differential adjustment slider can be simplified, and the number of parts required for the transmission between the differential wrench shaft and the differential adjustment slider is reduced. On the one hand, this plays a role in reducing costs and facilitating installation. On the other hand, it can also reduce the clearance during the power transmission between the differential wrench shaft and the differential adjustment slider and improve the stability of power transmission.

[0011] In one embodiment, the connecting rod assembly further includes a connecting shaft, and the conversion crank and the small connecting rod can be rotatably connected through the connecting shaft;

[0012] Wherein, the connecting shaft is arranged above the differential wrench shaft.

[0013] It can be understood that the hinged part between the conversion crank and the small connecting rod is arranged above the differential wrench shaft, which can provide sufficient working space for the connection of the connecting shaft between the conversion crank and the small connecting rod, so as to facilitate the assembly connection between the conversion crank and the small connecting rod.

[0014] In one embodiment, the connecting rod assembly further includes a connecting piece, and a part of the connecting piece is inserted into the small connecting rod and rotatably connected to the small connecting rod;

[0015] Wherein, the connecting piece is used for fixedly connecting to the differential adjustment slider.

[0016] In one embodiment, a third arc-shaped hole is formed on the differential indicating plate;

[0017] Wherein, the differential adjustment mechanism further includes a differential wrench fastener, and the differential wrench fastener passes through the third arc-shaped hole and is screwed to the differential wrench, and is used to control the locking / unlocking of the differential wrench on the differential indicating plate.

[0018] It can be understood that through the threaded connection between the differential wrench fastener and the differential wrench, the differential wrench can be fixed on the differential indicating plate, and the conversion crank can be fixed, which can prevent the conversion crank from swinging. Thus, when adjusting the differential wrench fastener to a certain position in the third arc-shaped hole, the differential ratio of the multi-stage differential adjustment device with this differential adjustment mechanism can be ensured to be constant, and it is convenient to adjust the differential ratio.

[0019] This application also claims to protect a multi-stage differential adjustment device, including a differential mechanism and the differential adjustment mechanism described above;

[0020] Wherein, the differential mechanism includes a differential adjustment slider and a differential crank. The differential adjustment slider is installed on the differential crank and is hinged to the small connecting rod. Moreover, the small connecting rod can drive the differential adjustment slider to slide on the differential crank and adjust the installation position between the differential adjustment slider and the differential crank.

[0021] In one embodiment, the differential mechanism further includes a differential shaft, a feed shaft differential crank, and a differential connecting rod. The differential shaft is fixedly connected to the differential crank and is in transmission connection with the feed shaft differential crank; one end of the differential connecting rod is hinged to the feed shaft differential crank, and the other end of the differential connecting rod is hinged to the differential adjustment slider;

[0022] Wherein, the feed shaft differential crank is used for being fixedly connected to the feed shaft.

[0023] In one embodiment, the differential mechanism further includes a differential tooth, a differential tooth bracket, a differential swing rod, and a differential feed connecting rod. The differential swing rod is fixedly connected to the differential shaft and is hinged to one end of the differential feed connecting rod. The other end of the differential feed connecting rod is hinged to the differential tooth bracket, and the differential tooth is fixedly connected to the differential tooth bracket;

[0024] Wherein, the installation position of the differential feed connecting rod on the differential swing rod can be adjusted.

[0025] In one embodiment, the differential swing rod is provided with a first arc-shaped hole and a second arc-shaped hole. The aperture of the first arc-shaped hole is smaller than that of the second arc-shaped hole and is communicated with the second arc-shaped hole, so that a stepped surface is formed at the part where the first arc-shaped hole is communicated with the second arc-shaped hole on the differential swing rod;

[0026] Wherein, the differential adjustment mechanism further includes a fastening component. The fastening component can lock the differential feed connecting rod to the stepped surface. Moreover, the fastening component can make a position adjustment relative to the differential swing rod along the plane direction of the stepped surface and adjust the installation position of the differential feed connecting rod on the differential swing rod.

[0027] It is understandable that the movement of the fastening component in the plane direction of the step surface is used to adjust the installation position of the differential feed link on the differential swing rod, so as to adjust the differential ratio of the multi-stage differential adjustment device.

[0028] In one embodiment, the fastening component includes an adjusting pin, a sleeve and a nut. The adjusting pin passes through the differential feed link, the first arc-shaped hole and the second arc-shaped hole and abuts against the differential feed link. The sleeve is arranged between the adjusting pin and the differential feed link and is rotatably connected to the differential feed link; the nut is arranged in the second arc-shaped hole and abuts against the step surface, and the nut is threadedly connected to the adjusting pin;

[0029] Wherein, the nut can move in the second arc-shaped hole.

[0030] It is understandable that by using the threaded connection between the nut and the adjusting pin, the fastening component can adjust the installation position of the differential feed link on the differential swing rod by screwing the adjusting pin, so as to facilitate the adjustment of the differential ratio of the multi-stage differential adjustment device.

[0031] This application also claims protection for a sewing machine, including the multi-stage differential adjustment device described above.

[0032] Due to the application of the above technical solutions, the present utility model has the following advantages compared with the prior art:

[0033] The differential adjustment mechanism, multi-stage differential adjustment device and sewing machine claimed in this application use a conversion crank and a small connecting rod to realize the transmission between the differential wrench shaft and the differential adjustment slider. In this way, the transmission between the differential wrench shaft and the differential adjustment slider can be simplified, and the number of parts required for the transmission between the differential wrench shaft and the differential adjustment slider can be reduced. On the one hand, this can reduce costs and facilitate installation, and on the other hand, it can also reduce the clearance during the power transmission between the differential wrench shaft and the differential adjustment slider and improve the stability of power transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 It is a schematic structural diagram of a multi-stage differential adjustment device provided by an embodiment of the present application.

[0036] Figure 2 This is a schematic structural diagram of another perspective of the multi-stage differential adjustment device provided by an embodiment of the present application.

[0037] Figure 3 This is a schematic partial structural diagram of the multi-stage differential adjustment device provided by an embodiment of the present application.

[0038] Figure 4 This is an exploded view of the fastening assembly, differential feed link, and differential swing rod during assembly in the present application.

[0039] Reference numerals: 100, multi-stage differential adjustment device; 101, connecting shaft; 102, connecting member; 1021, screw; 110, main shaft; 120, feeding mechanism; 121, feeding shaft; 122, feed dog carrier; 123, feed dog; 124, feed eccentric wheel; 125, feed link; 126, stitch pitch link; 127, feed crank; 128, feeding shaft crank; 129, feed linklet; 130, differential mechanism; 131, differential shaft; 132, differential dog carrier; 133, differential dog; 134, feeding shaft differential crank; 135, differential link; 136, differential crank; 137, differential adjustment slider; 138, differential swing rod; 1381, first arc-shaped hole; 1382, second arc-shaped hole; 1383, stepped surface; 139, differential feed link; 140, differential adjustment mechanism; 141, differential indicating plate; 1411, third arc-shaped hole; 142, differential wrench; 143, differential wrench shaft; 1145, link assembly; 144, conversion crank; 145, linklet; 146, differential wrench fastener; 147, fastening assembly; 1471, adjusting pin; 1472, adjusting gasket; 1473, sleeve; 1474, nut; 150, lifter mechanism; 151, lifter link; 152, lifter crank; 153, lifter shaft; 154, first lifter slider; 155, second lifter slider; 156, first groove; 157, second groove; 160, needle plate. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0041] It should be noted that when an element is referred to as "provided on" another element, it can be directly provided on the other element or there may be an intermediate element. When an element is considered to be "provided on" another element, it can be directly provided on the other element or there may be an intermediate element at the same time. When an element is considered to be "fixed to" another element, it can be directly fixed to the other element or there may be an intermediate element at the same time.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs. The terms used in the description of this utility model are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0043] As Figure 2 , Figure 3 As shown, a differential adjustment mechanism 140 provided in an embodiment of the present application includes a differential indicating plate 141, a differential wrench 142, a differential wrench shaft 143, and a link assembly 1145. The differential indicating plate 141 is used for fixedly connecting to a machine housing (not shown in the figure), and the differential wrench shaft 143 is used for rotatably connecting to the machine housing; the differential wrench 142 is fixedly connected to the differential wrench shaft 143 and is connected to the differential indicating plate 141. Moreover, the installation position of the differential wrench 142 on the differential indicating plate 141 can be adjusted and drives the differential wrench shaft 143 to rotate; the link assembly 1145 includes a conversion crank 144 and a small link 145. One end of the conversion crank 144 is fixedly connected to the differential wrench shaft 143, the other end of the conversion crank 144 is hinged to one end of the small link 145, and the other end of the small link 145 is used for hinging a differential adjustment slider 137. Here, the machine housing is the housing of a sewing machine to which the differential adjustment mechanism 140 is applied. It should be noted that when the differential adjustment mechanism 140 works, the principle of adjusting the differential ratio of the multi-stage differential adjustment device 100 to which the differential adjustment mechanism 140 is applied by adjusting the position of the differential adjustment slider 137 can adopt the conventional method of existing sewing machines and will not be elaborated herein.

[0044] As can be seen from the above, when the differential adjustment mechanism 140 of the present application works, the transmission between the differential wrench shaft 143 and the differential adjustment slider 137 is realized through the conversion crank 144 and the small link 145. In this way, the transmission between the differential wrench shaft 143 and the differential adjustment slider 137 can be simplified, and the number of parts required for the transmission between the differential wrench shaft 143 and the differential adjustment slider 137 is reduced. On the one hand, this plays a role in reducing costs and facilitating installation. On the other hand, it can also reduce the clearance during the power transmission between the differential wrench shaft 143 and the differential adjustment slider 137 and improve the stability of power transmission.

[0045] As Figure 2 shown, a third arc-shaped hole 1411 is formed in the differential indicating plate 141; wherein, the differential adjusting mechanism 140 further includes a differential wrench fastener 146, the differential wrench fastener 146 is disposed through the third arc-shaped hole 1411 and is screwed to the differential wrench 142 for controlling the locking / unlocking of the differential wrench 142 on the differential indicating plate 141. That is to say, when the differential adjusting mechanism 140 works, the differential wrench fastener 146 can be first screwed, and the locking of the differential wrench 142 on the differential indicating plate 141 is released, and then, guided by the differential indicating plate 141, the installation position of the differential wrench 142 on the differential indicating plate 141 is adjusted. During this process, the differential wrench 142 can, through the transmission of the differential wrench shaft 143, the conversion crank 144 and the small connecting rod 145, realize the position adjustment of the differential adjusting slider 137, and finally, the differential wrench fastener 146 is used to lock the differential wrench 142 to the differential indicating plate 141 again.

[0046] It can be understood that through the threaded connection between the differential wrench fastener 146 and the differential wrench 142, the differential wrench 142 can be fixed on the differential indicating plate 141, and the fixing of the conversion crank 144 can be realized, so that the conversion crank 144 can be prevented from swinging, thereby ensuring that when the differential wrench fastener 146 is adjusted to a certain position in the third arc-shaped hole 1411, the differential ratio of the multi-stage differential adjusting device 100 applying the differential adjusting mechanism 140 is constant, and the adjustment of the differential ratio is facilitated.

[0047] As Figure 2 、 Figure 3 shown, the connecting rod assembly 1145 further includes a connecting shaft 101, and the connecting shaft 101 is disposed above the differential wrench shaft 143; and, the conversion crank 144 and the small connecting rod 145 can be rotatably connected through the connecting shaft 101, and the hinged connection between the conversion crank 144 and the small connecting rod 145 is realized. Here, since the hinged part between the conversion crank 144 and the small connecting rod 145 is disposed above the differential wrench shaft 143, sufficient working space can be provided for the connection between the connecting shaft 101 and the conversion crank 144 and the small connecting rod 145, so as to facilitate the assembly connection between the conversion crank 144 and the small connecting rod 145. Of course, in other embodiments, the connecting shaft 101 for hinging the conversion crank 144 and the small connecting rod 145 can also be arranged at other positions of the differential wrench shaft 143, which will not be elaborated here.

[0048] As Figure 2 、 Figure 3As shown, the connecting rod assembly 1145 further includes a connecting member 102. The connecting member 102 is partially inserted into the small connecting rod 145 and rotatably connected to the small connecting rod 145. The connecting member 102 is used to fixedly connect to the differential adjustment slider 137. That is to say, the small connecting rod 145 and the differential adjustment slider 137 can be hinged through the connecting member 102. Here, the connecting member 102 can specifically be abutted against the differential adjustment slider 137, and then the connecting member 102 is fixed to the differential adjustment slider 137 with a screw 1021.

[0049] As Figure 1 、 Figure 2 shown, a multi-stage differential adjustment device 100 provided by an embodiment of the present application includes a differential mechanism 130 and the above-mentioned differential adjustment mechanism 140.

[0050] As Figure 1 shown, the differential mechanism 130 includes a differential shaft 131, a differential tooth holder 132, a differential tooth 133, a feed shaft differential crank 134, a differential connecting rod 135, a differential crank 136, a differential adjustment slider 137, a differential swing rod 138, and a differential feed connecting rod 139. One end of the differential connecting rod 135 is hinged to the feed shaft differential crank 134, and the other end of the differential connecting rod 135 is hinged to the differential adjustment slider 137. The differential adjustment slider 137 is mounted on the differential crank 136, and the differential crank 136 is fixedly connected to the differential shaft 131. The differential swing rod 138 is fixedly connected to the differential shaft 131. The other end of the differential feed connecting rod 139 is hinged to the differential tooth holder 132, and the differential tooth 133 is fixed on the differential tooth holder 132. Here, the feed shaft differential crank 134 is used to fixedly connect to the feed shaft 121 of the feed mechanism 120 in the multi-stage differential adjustment device 100.

[0051] It should be noted that, as Figure 1 shown, the feed mechanism 120 of the present application further includes a feed tooth holder 122, a feed tooth 123, a feed eccentric wheel 124, a feed connecting rod 125, a stitch pitch connecting rod 126, a feed crank 127, a feed shaft crank 128, and a feed small connecting rod 129. The feed eccentric wheel 124 is sleeved on the main shaft 110 of the multi-stage differential adjustment device 100, and one end of the feed connecting rod 125 is hinged to the feed eccentric wheel 124. And, the other end of the feed connecting rod 125 is hinged to one end of the stitch pitch connecting rod 126, and the other end of the stitch pitch connecting rod 126 is hinged to the feed crank 127. The feed crank 127 is fixedly connected to the feed shaft 121, and the feed shaft crank 128 is fixedly connected to the feed shaft 121. One end of the feed small connecting rod 129 is hinged to the feed shaft crank 128, and the other end of the feed small connecting rod 129 is hinged to the feed tooth holder 122. The feed tooth 123 is fixedly connected to the feed tooth holder 122.

[0052] As Figure 1 、 Figure 4As shown, the installation position of the differential feed link 139 on the differential swing link 138 can be adjusted. That is to say, when the multi-stage differential adjustment device 100 of the present application is working, the differential ratio of the multi-stage differential adjustment device 100 can also be adjusted by adjusting the installation position between the differential feed link 139 and the differential swing link 138. It should be noted that after the installation position of the differential feed link 139 on the differential swing link 138 is adjusted, the working principle of how to correspondingly adjust the differential ratio in the multi-stage differential adjustment device 100 can adopt the existing conventional method, and will not be elaborated here.

[0053] Preferably, as Figure 4 shown, a first arc-shaped hole 1381 and a second arc-shaped hole 1382 are formed on the differential swing link 138. The aperture of the first arc-shaped hole 1381 is smaller than that of the second arc-shaped hole 1382 and is communicated with the second arc-shaped hole 1382, so that a stepped surface 1383 is formed at the part where the first arc-shaped hole 1381 is communicated with the second arc-shaped hole 1382 on the differential swing link 138. The differential adjustment mechanism 140 further includes a fastening assembly 147. The fastening assembly 147 can lock the differential feed link 139 to the stepped surface 1383, and the fastening assembly 147 can make a position adjustment relative to the differential swing link 138 along the plane direction of the stepped surface 1383 and adjust the installation position of the differential feed link 139 on the differential swing link 138. That is to say, the multi-stage differential adjustment device 100 can use the movement of the fastening assembly 147 in the plane direction of the stepped surface 1383 to adjust the installation position of the differential feed link 139 on the differential swing link 138, so as to realize the adjustment of the differential ratio of the multi-stage differential adjustment device 100.

[0054] As Figure 4As shown, the fastening assembly 147 includes an adjusting pin 1471, a sleeve 1473, and a nut 1474. The adjusting pin 1471 passes through the differential feed connecting rod 139, the first arcuate hole 1381, and the second arcuate hole 1382 and abuts against the differential feed connecting rod 139. The sleeve 1473 is disposed between the adjusting pin 1471 and the differential feed connecting rod 139 and is rotatably connected to the differential feed connecting rod 139. The nut 1474 is disposed in the second arcuate hole 1382 and abuts against the step surface 1383, and the nut 1474 is threadedly connected to the adjusting pin 1471. That is to say, the fastening assembly 147 can lock / unlock the installation position of the differential feed connecting rod 139 on the differential swing rod 138 by controlling the threaded engagement structure between the nut 1474 and the adjusting pin 1471, so that the fastening assembly 147 can adjust the installation position of the differential feed connecting rod 139 on the differential swing rod 138 by screwing the adjusting pin 1471, which is convenient for adjusting the installation position between the differential feed connecting rod 139 and the differential swing rod 138 and for adjusting the differential ratio of the multi-stage differential adjusting device 100. Here, the fastening assembly 147 further includes an adjusting gasket 1472, and the adjusting pin 1471 can be pressed against the sleeve 1473 and the differential feed connecting rod 139 through the adjusting gasket 1472.

[0055] As Figure 1 , Figure 2 shown, the multi-stage differential adjusting device 100 of the present application further includes a tooth-lifting mechanism 150 and a needle plate 160. Among them, the tooth-lifting mechanism 150 includes a tooth-lifting connecting rod 151, a tooth-lifting crank 152, a tooth-lifting shaft 153, a first tooth-lifting slider 154, a second tooth-lifting slider 155, a first groove 156, and a second groove 157. One end of the tooth-lifting connecting rod 151 is hinged to the feed eccentric wheel 124, and the other end of the tooth-lifting connecting rod 151 is hinged to the tooth-lifting crank 152. The tooth-lifting crank 152 is fixedly connected to the tooth-lifting shaft 153.

[0056] As can be seen from the above, when the multi-stage differential adjusting device 100 of the present application works, the rotational movement of the main shaft 110 is converted into the swinging movement of the feed shaft 121 through the feed eccentric wheel 124, the feed connecting rod 125, the stitch pitch connecting rod 126, and the feed crank 127. And the swinging movement of the feed shaft 121 is converted into the horizontal movement of the feed dog frame 122 through the feed shaft crank 128 and the feed link 129, thereby driving the horizontal movement of the feed dog 123. The swinging movement of the feed shaft 121 is converted into the swinging movement of the differential shaft 131 through the feed shaft differential crank 134, the differential link 135, the differential crank 136, and the differential adjusting slider 137. And the swinging movement of the differential shaft 131 is converted into the horizontal movement of the differential dog frame 132 through the differential swing rod 138 and the differential feed connecting rod 139, thereby driving the horizontal movement of the differential dog 133.

[0057] By adjusting the position of the differential wrench fastener 146 within the third arc-shaped hole 1411, the differential wrench 142, differential wrench shaft 143, and conversion crank 144 are driven to swing, thereby adjusting the position of the articulated joint between the conversion crank 144 and the small connecting rod 145, changing the movement stroke of the differential tooth 133 along with the swing of the differential shaft 131, and further adjusting the differential ratio. Through the threaded connection between the differential wrench fastener 146 and the differential wrench 142, the differential wrench 142 can be fixed on the differential indicating plate 141, and at the same time, the conversion crank 144 is also fixed, preventing the conversion crank 144 from swinging during the swing of the differential shaft 131, ensuring that when the differential wrench fastener 146 is adjusted to a certain position within the third arc-shaped hole 1411, the differential ratio is constant.

[0058] By adjusting the position of the adjusting pin 1471 within the first arc-shaped hole 1381, the movement stroke of the differential tooth 133 along with the swing of the differential shaft 131 can be adjusted, and further the differential ratio can be adjusted. Through the cooperation of the external thread of the adjusting pin 1471 and the internal thread of the nut 1474, the adjusting pin 1471 can be fixed within the first arc-shaped hole 1381, preventing the position of the adjusting pin 1471 from changing within the first arc-shaped hole 1381 along with the swing of the differential shaft 131 during the swing of the differential shaft 131, ensuring that when the adjusting pin 1471 is adjusted to a certain position within the first arc-shaped hole 1381, the differential ratio is constant.

[0059] The rotational motion of the main shaft 110 is converted into the swinging motion of the lifting tooth shaft 153 through the feed eccentric wheel 124, lifting tooth connecting rod 151, and lifting tooth crank 152. First grooves 156 and second grooves 157 are provided at both ends of the feed dog carrier 122 and the differential tooth carrier 132. After the feed dog carrier 122 and the differential tooth carrier 132 are assembled, the first groove of the feed dog carrier 122 coincides with the first groove of the differential tooth carrier 132. The second groove of the feed dog carrier 122 coincides with the second groove of the differential tooth carrier 132. The first lifting tooth slider 154 is slidably disposed within the first groove 156 and is eccentrically connected to the main shaft 110. The second lifting tooth slider 155 is slidably disposed within the second groove 157 and is eccentrically connected to the lifting tooth shaft 153. When the main shaft 110 and the lifting tooth shaft 153 move, the first lifting tooth slider 154 and the second lifting tooth slider 155 can be driven to reciprocate up and down in the vertical direction, thereby controlling the distance between the feed dog 123 and the upper surface of the needle plate 160, as well as the distance between the differential tooth 133 and the upper surface of the needle plate 160, and completing the fabric feeding operation and sewing operation.

[0060] In addition, the present invention also provides a sewing machine including the multi-stage differential adjustment device 100 described above.

[0061] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above 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.

[0062] Those of ordinary skill in the art of this technology should recognize that the above embodiments are only used to illustrate the present utility model, rather than to limit the present utility model. As long as it is within the scope of the essential spirit of the present utility model, appropriate changes and variations made to the above embodiments fall within the scope of protection required by the present utility model.

Claims

1. A differential adjustment mechanism is applied to a sewing machine, characterized in that, The differential adjustment mechanism (140) includes: A differential indicating plate (141) for fixedly connecting to the machine housing; A differential wrench shaft (143) for rotatably connecting to the machine housing; A differential wrench (142) fixedly connected to the differential wrench shaft (143) and connected to the differential indicating plate (141), and the mounting position of the differential wrench (142) on the differential indicating plate (141) can be adjusted and drives the differential wrench shaft (143) to rotate; A connecting rod assembly (1145) including a conversion crank (144) and a small connecting rod (145), one end of the conversion crank (144) is fixedly connected to the differential wrench shaft (143), the other end of the conversion crank (144) is hinged to one end of the small connecting rod (145), and the other end of the small connecting rod (145) is used for hinging a differential adjustment slider (137).

2. The differential adjustment mechanism according to claim 1, characterized in that The connecting rod assembly (1145) further includes a connecting shaft (101), and the conversion crank (144) and the small connecting rod (145) can be rotatably connected through the connecting shaft (101); Wherein, the connecting shaft (101) is arranged above the differential wrench shaft (143).

3. The differential adjustment mechanism according to claim 1, characterized in that, The connecting rod assembly (1145) further includes a connecting piece (102), and the connecting piece (102) is partially inserted into the small connecting rod (145) and rotatably connected to the small connecting rod (145); Wherein, the connecting piece (102) is used for fixedly connecting to the differential adjustment slider (137).

4. The differential adjustment mechanism according to claim 1, wherein A third arc-shaped hole (1411) is formed on the differential indicating plate (141); Wherein, the differential adjustment mechanism (140) further includes a differential wrench fastener (146), the differential wrench fastener (146) is arranged through the third arc-shaped hole (1411) and is screwed to the differential wrench (142) for controlling the locking / unlocking of the differential wrench (142) on the differential indicating plate (141).

5. A multi-stage differential adjustment device, characterized in that, Including a differential mechanism (130) and the differential adjustment mechanism (140) according to any one of claims 1 to 4; Wherein, the differential mechanism (130) includes a differential adjustment slider (137) and a differential crank (136), the differential adjustment slider (137) is mounted on the differential crank (136) and is hinged to the small connecting rod (145), and the small connecting rod (145) can drive the differential adjustment slider (137) to slide on the differential crank (136) and adjust the mounting position between the differential adjustment slider (137) and the differential crank (136).

6. The multi-stage differential adjustment device according to claim 5, characterized in that, The differential mechanism (130) further includes a differential shaft (131), a feed shaft differential crank (134), and a differential link (135). The differential shaft (131) is fixedly connected to the differential crank (136) and is in driving connection with the feed shaft differential crank (134); one end of the differential link (135) is hinged to the feed shaft differential crank (134), and the other end of the differential link (135) is hinged to the differential adjustment slider (137); wherein, the feed shaft differential crank (134) is used for being fixedly connected to the feed shaft (121).

7. The multi-stage differential adjustment device according to claim 6, characterized in that, The differential mechanism further includes a differential tooth (133), a differential tooth bracket (132), a differential swing rod (138), and a differential feed link (139). The differential swing rod (138) is fixedly connected to the differential shaft (131) and is hinged to one end of the differential feed link (139). The other end of the differential feed link (139) is hinged to the differential tooth bracket (132), and the differential tooth (133) is fixedly connected to the differential tooth bracket (132); wherein, the mounting position of the differential feed link (139) on the differential swing rod (138) can be adjusted.

8. The multi-stage differential adjustment device according to claim 7, characterized in that The differential swing rod (138) is provided with a first arc-shaped hole (1381) and a second arc-shaped hole (1382). The aperture of the first arc-shaped hole (1381) is smaller than that of the second arc-shaped hole (1382) and is communicated with the second arc-shaped hole (1382). Moreover, the differential swing rod (138) forms a stepped surface (1383) at the part where the first arc-shaped hole (1381) is communicated with the second arc-shaped hole (1382); wherein, the differential adjustment mechanism (140) further includes a fastening assembly (147). The fastening assembly (147) can lock the differential feed link (139) to the stepped surface (1383), and the fastening assembly (147) can make a position adjustment relative to the differential swing rod (138) along the plane direction of the stepped surface (1383) and adjust the mounting position of the differential feed link (139) on the differential swing rod (138).

9. The multi-stage differential adjustment device according to claim 8, characterized in that, The fastening assembly (147) includes an adjusting pin (1471), a sleeve (1473), and a nut (1474). The adjusting pin (1471) passes through the differential feed link (139), the first arc-shaped hole (1381), and the second arc-shaped hole (1382) and abuts against the differential feed link (139). The sleeve (1473) is arranged between the adjusting pin (1471) and the differential feed link (139) and is rotatably connected to the differential feed link (139); the nut (1474) is arranged in the second arc-shaped hole (1382) and abuts against the stepped surface (1383), and the nut (1474) is threadedly connected to the adjusting pin (1471); wherein, the nut (1474) can move in the second arc-shaped hole (1382).

10. A sewing machine, characterized in that, Comprising the multi-stage differential adjustment device (100) according to any one of claims 5 to 9.

Images