Sewing machine stand and sewing machine

Abstract

The application provides a sewing machine base and a sewing machine. The sewing machine base comprises a machine cylinder extending along a feeding direction in a horizontal plane from a base body. A feeding mechanism and a hooking mechanism are arranged in the machine cylinder. In the base body, below the horizontal plane of the machine cylinder, a first transmission shaft and a second transmission shaft are arranged, both of which are parallel to the machine cylinder. One of the first transmission shaft and the second transmission shaft is used to drive the feeding mechanism to complete a feeding movement and the hooking mechanism to move along the feeding direction. The other of the first transmission shaft and the second transmission shaft is used to drive the hooking mechanism to swing around the feeding direction. The sewing machine base places the feeding mechanism and the hooking mechanism in the machine cylinder below the horizontal plane of the machine cylinder, avoids occupying the space above the horizontal plane of the machine cylinder, and thus widens the field of view above the machine cylinder and avoids the activity range being divided by the base body.

Description

Technical Field

[0001] This invention relates to the field of sewing equipment technology, specifically to a sewing machine base and a sewing machine. Background Technology

[0002] Industrial sewing machines are one of the key pieces of equipment in the garment industry. They typically have a suspended barrel to sew the edges of fabric as much as possible in different usage scenarios. In particular, when sewing opposite sides of fabric to form a tubular product, the barrel can extend into the interior of the finished tubular product, making it more practical.

[0003] In existing technologies, such as the Chinese invention patent CN206448032U entitled "Front-mounted manual adjustment device for a curved arm sewing machine" and the utility model patent CN101570922B entitled "Needle guard structure for a four-needle six-thread sewing machine," the machine head is positioned above the machine barrel, and the transmission mechanism is positioned above the tail of the machine barrel. This results in the tail of the machine barrel having an upward protrusion or a frame for connecting the drive mechanism or the machine head transmission system. These protrusions or frames positioned above the machine base affect the operator's field of vision when observing the sewing position and also limit the operator's range of motion in the upper limbs.

[0004] In Chinese Utility Model Application No. 2022226357104, the applicant of this case provided a sunken sewing machine, which places the housing connecting the machine head and the base, as well as the transmission mechanism in the housing, below the plane of the machine barrel, in order to avoid the problems of obstructed vision and limited range of motion of the operator's upper limbs in the prior art. However, the application did not disclose the specific structural form of the base part. Summary of the Invention

[0005] To address the technical problems of obstructed vision and limited upper limb movement caused by the transmission mechanism being located above the tail of the sewing machine in existing sewing machines, this invention provides a sewing machine base and a sewing machine.

[0006] The technical solution of the present invention provides a sewing machine base, including a machine barrel extending from the machine base body in a horizontal plane along the feeding direction. The machine barrel is provided with a feeding mechanism and a hooking mechanism. In the machine base body, a first transmission shaft and a second transmission shaft, both parallel to the machine barrel, are provided below the horizontal plane where the machine barrel is located. The transmission ratio between the first transmission shaft and the second transmission shaft is fixed.

[0007] One of the first drive shaft and the second drive shaft is used to drive the feeding mechanism to complete the feeding motion and the hook mechanism to move along the feeding direction, and the other is used to drive the hook mechanism to realize the swing around the feeding direction.

[0008] Specifically, the base body includes a hook line swing branch;

[0009] The hook line swing branch is provided with a transition crank with a rotating shaft along the feeding direction. The transition crank has a first transition handle and a second transition handle extending radially from its rotating shaft.

[0010] The first transition handle is pivotally connected to the end of the second transmission shaft via a first transition connecting rod, and the pivot is eccentrically positioned relative to the rotating shaft of the second transmission shaft.

[0011] The second transition handle is hinged to the end of the hook shaft of the hook mechanism via a second transition link.

[0012] Specifically, the eccentricity between the pivot and the rotating shaft of the second transmission shaft is adjustable.

[0013] Specifically, the machine base body includes a feeding swing branch with a swing linkage;

[0014] The feeding mechanism includes a front feeding swing arm and a rear feeding swing arm arranged along the feeding direction F;

[0015] The swing linkage includes a forward and reverse toothed linkage and a first eccentric bearing and a first joint bearing respectively disposed at both ends of the forward and reverse toothed linkage;

[0016] One end of the forward and reverse toothed connecting rod is sleeved on the first transmission shaft through the first eccentric bearing, and the other end is hinged to one end of the rear feeding swing arm and / or one end of the front feeding swing arm.

[0017] Specifically, the forward and reverse toothed connecting rod is connected to the front feeding swing arm through the first joint bearing, and the front feeding swing arm is provided with a toothed part along the feeding direction, and one end of the rear feeding swing arm is embedded in the toothed part.

[0018] Specifically, the machine base body includes a feeding movement branch;

[0019] The feeding moving branch is hinged to the feeding crank that is rotatably fixed above the first transmission shaft via a swing link. The feeding crank rotates in a vertical plane parallel to the feeding direction. The feeding crank has at least two handles that extend radially from its axis of rotation: a first handle and a second handle.

[0020] The first handle is hinged to the swing link, and the second handle is used to drive the rear feeding swing arm and the front feeding swing arm to reciprocate along the feeding direction via the feeding link.

[0021] Specifically, the feeding movement branch includes a second feeding crank that is rotatably fixed, a left adjusting handle connecting the second feeding crank to the left feeding link connecting the rear feeding arm, and a right adjusting handle connecting the second feeding crank to the right feeding link connecting the front feeding arm.

[0022] The left adjusting handle and / or the right adjusting handle are pivotally connected to one end of the feeding link, and the other end of the feeding link is pivotally connected to the second handle.

[0023] Specifically, a single feeding step adjustment mechanism is provided at both ends of the second feeding crank axial direction; the two sets of single feeding step adjustment mechanisms are arranged in a mirror image.

[0024] The single feed step adjustment mechanism at the left end includes a rotating adjustment crank and separate step adjustment knobs. The adjustment crank includes a first manual adjustment handle and a second manual adjustment handle that are fixedly connected to each other.

[0025] The first manual adjustment handle is pivotally connected to the third manual adjustment handle fixed to the discrete step adjustment knob;

[0026] The adjusting linkage is pivotally connected to the second manual adjusting handle and the front feeding swing arm, respectively.

[0027] Specifically, it also includes a total feeding step adjustment mechanism, which includes a rotatable step adjustment knob, and a fourth manual adjustment handle fixedly connected to the step adjustment knob is pivotally connected to the feeding connecting rod via a second adjustment connecting rod. The pivot of the feeding connecting rod is slidably set in the feeding adjustment groove of the second handle.

[0028] Specifically, the hook mechanism has a hook shaft inside the barrel along the feeding direction F, a guide block is fixed on the hook shaft, and a guide groove on the guide block slides in cooperation with a guide pin fixed in the machine base body along the feeding direction.

[0029] The feeding crank is equipped with a third crank section, and the displacement connecting rod is pivotally connected to the third crank section and the guide block respectively.

[0030] Specifically, two cam plates are spaced apart on the end of the first drive shaft facing the barrel; a wire threading seat is provided on the machine base body;

[0031] The threading seat includes two sets of threading rods respectively disposed on the outer side of the cam plate. The portion of the threading rod extending into the projection range of the cam plate along the first transmission shaft is provided with threading holes for threading the bottom thread.

[0032] The threading seat also includes a thread take-up lever that extends into the gap between the two cam plates, and the thread take-up lever is provided with at least one set of thread take-up slots extending from outside the projection range of the cam plates to inside the projection range of the cam plates.

[0033] Preferably, the first drive shaft and the second drive shaft are arranged in a vertical direction.

[0034] The present invention provides a sewing machine, which includes the sewing machine base described in any of the above claims.

[0035] Specifically, the power component of the sewing machine is output to the first or second drive shaft of the sewing machine base via the transmission system, and the sewing machine base and the machine body of the sewing machine base are at least partially recessed below the worktable of the sewing machine.

[0036] The sewing machine base of the present invention places the feeding mechanism and the hooking mechanism for driving the machine barrel below the horizontal plane of the machine barrel, thus eliminating the space occupied by the base body above the horizontal plane of the machine barrel, thereby making the field of view above the machine barrel open and the range of motion not divided by the base body. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of the sewing machine base of the present invention;

[0038] Figure 2 This is a partial schematic diagram of the internal structure at the sewing end of the present invention;

[0039] Figure 3 This is a schematic diagram of the overall internal structure of the sewing machine base of the present invention;

[0040] Figure 4 This is a schematic diagram of the first transmission shaft, feeding mechanism, and corresponding drive connection mechanism of the present invention;

[0041] Figure 5 This is a schematic diagram of the hinged end of the positive and negative tooth connecting rod of the present invention;

[0042] Figure 6 This is a schematic diagram of the single feeding step adjustment mechanism of the present invention;

[0043] Figure 7 This is a schematic diagram of the total feeding step pitch adjustment mechanism of the present invention;

[0044] Figure 8 This is a schematic diagram of the structure of the second transmission shaft, the hook shaft, and the hook swing branch connecting the two of the present invention.

[0045] Figure 9 This is a schematic diagram of the structure of the present invention that realizes shuttle movement through a feeding swing branch;

[0046] Figure 10 This is a schematic diagram of the thread-taking mechanism of the present invention;

[0047] Figure 11 This is a schematic diagram of a sewing machine using the sewing machine base of the present invention.

[0048] In the picture,

[0049] 1: Sewing machine base 2: Sewing machine 21: Sewing machine base 22: Worktable 11: Machine body 12: Machine barrel 12S: Sewing end 121: Feeding mechanism 1211: Front feed dog 1212: Rear feed dog 1215: Feeding swing shaft 1219: Front feed swing arm 1218: Rear feed swing arm 122: Thread hooking mechanism 1221: Shuttle 1222: Thread hooking shaft 131: First drive shaft 132: Second drive shaft 133: First transmission device 141: Feeding swing support 142: Feeding movement branch; 143: Hook line swing branch; 14S: Swinging connecting rod; 1411: Positive and negative tooth connecting rod; 1412: First eccentric bearing; 1413: First joint bearing; 1422: Feeding crank; 1423: First handle; 1424: Second handle; 1429: Third handle; 14G: Feeding adjustment groove; 1425: Feeding connecting rod; 1426: Second feeding crank; 261: Left adjusting handle; 262: Right adjusting handle; 263: Groove; 1427: Left feeding connecting rod; 14 28: Right feed connecting rod 1431: Transition crank 311: First transition handle 312: Second transition handle 313: First transition connecting rod 314: Second transition connecting rod 315: Adjusting screw 151: Single feed pitch adjustment mechanism 1511: Adjusting crank 15S1: First manual adjustment handle 15S2: Second manual adjustment handle 1512: Separate pitch adjustment knob 15S3: Third manual adjustment handle 1513: Adjusting connecting rod 152: Total feed pitch adjustment mechanism 1521: Step adjustment knob 1522: Fourth manual adjustment handle 1523: Second adjustment linkage 161: Hook shaft moving mechanism 1611: Displacement linkage 1612: Guide pin 1613: Guide block 1614: Guide groove 171: Thread take-up mechanism 1711: Cam plate 1712: Thread threading rod 1713: Thread take-up rod 1714: Thread take-up slot 1715: Thread threading seat 1716: Thread threading hole L: Bottom thread H: Horizontal direction V: Vertical direction F: Feeding direction g1: Outward stroke g2: Return stroke Detailed Implementation

[0050] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. In this specification, the dimensions of the drawings do not represent the actual dimensions. They are only used to illustrate the relative positional and connection relationships between the components. Components with the same name or the same reference numeral represent similar or identical structures and are limited to illustrative purposes.

[0051] Figure 1This is a schematic diagram of the overall structure of the sewing machine base 1 of the present invention. The diagram shows the sewing machine base 1 in its normal installation position, where the H direction is horizontal and the V direction is vertical. It includes a base body 11 and a barrel 12 extending from the base body 11 in the horizontal plane along the feeding direction F. Typically, a feeding mechanism 121 and a thread hooking mechanism 122 are provided in the sewing end 12S of the barrel 12, away from the base body 11. The feeding mechanism 121 is used to transport the fabric along the horizontal direction H on the barrel 12, and the thread hooking mechanism 122 is used to cooperate with the sewing needle of the sewing head to interweave the top and bottom threads. The structure of the feeding mechanism 121 and the thread hooking mechanism 122 is a mature technology in the prior art.

[0052] Figure 2 This is a partial schematic diagram of the internal structure at the sewing end 12S. At the sewing end 12S, the feeding mechanism 121 includes a front feed tooth 1211 and a rear feed tooth 1212 arranged front and rear along the feeding direction F towards the machine base body 11. A front feed swing arm 1219 and a rear feed swing arm 1218 are arranged inside the machine barrel 12, parallel to the extension direction of the machine barrel 12. For ease of arrangement, the rear feed swing arm 1218 and the front feed swing arm 1219 are typically positioned as follows: Figure 2 As shown, the rear feeding swing arm 1218 and the front feeding swing arm 1219, arranged side by side along the feeding direction F, have grooves at the same position along the feeding direction F. The feeding swing shaft 1215 passes through the grooves of both arms and is rotatably fixed to the barrel 12. Therefore, the rear feeding swing arm 1218 and the front feeding swing arm 1219 can slide in a restricted manner along the feeding direction F under the constraint of the feeding swing shaft 1215, and can rotate around the feeding swing shaft 1215.

[0053] With a suitable design of the transmission mechanism driving the rear feeding swing arm 1218 and the front feeding swing arm 1219 in the machine base body 11, the front feeding tooth 1211 and the rear feeding tooth 1212 complete... Figure 2 The schematic diagram illustrates the complete cyclic working trajectory formed by the outgoing stroke g1 and the return stroke g2, where fabric feeding is completed in the outgoing stroke g1 and no-load reset is completed in the return stroke g2. A hook-and-loop mechanism 122 has a shuttle 1221 positioned below the rear feed arm 1218 and the front feed arm 1219. The shuttle 1221 is located at one end of the hook-and-loop shaft 1222 at the sewing end 12S. The hook-and-loop shaft 1222 can rotate around its central axis and move in a restricted manner along its central axis, thereby causing the shuttle 1221 to perform a combined motion of movement along the central axis of the hook-and-loop shaft 1222 and oscillation around the central axis within the space below the rear feed arm 1218 and the front feed arm 1219. This combined motion, in conjunction with the sewing needle of the sewing head, achieves the looping and interlacing of the top and bottom threads.

[0054] Figure 3This is a schematic diagram of the overall internal structure of the sewing machine base 1, where the dashed lines represent the outline of the sewing machine base 1 for reference to the installation position of the internal structure. Inside the sewing machine base 1, a first drive shaft 131 and a second drive shaft 132 are arranged parallel to the machine barrel 12 and below its horizontal plane. The first drive shaft 131 and the second drive shaft 132 rotate at a fixed transmission ratio via a first transmission device 133. Figure 3 In this embodiment, the first transmission device 133 is a synchronous belt connecting the first transmission shaft 131 and the second transmission shaft 132. The transmission ratio of the synchronous belt is 1, meaning that the first transmission shaft 131 and the second transmission shaft 132 rotate synchronously. The relative positions of the first transmission shaft 131 and the second transmission shaft 132 in the vertical plane are not particularly required in principle. Figure 3 The diagram shows the arrangement of the first drive shaft 131 and the second drive shaft 132 in the vertical direction V, generally from top to bottom. In this case, the height of the base body 11 below the barrel 12 is determined by the second drive shaft 132 located at the bottom, but the cross-sectional profile of the base body 11 along the horizontal plane can be reduced, which is beneficial for equipment miniaturization and optimizes the shape and housing design of the base body 11.

[0055] One of the first drive shaft 131 and the second drive shaft 132 is used to drive the feeding mechanism 121 to move along the aforementioned working trajectory and to realize the movement of the shuttle 1221 along the central axis of the hook shaft 1222. The other drive shaft is used to drive the hook mechanism 122 to realize the aforementioned swing. When a single drive shaft is used to realize the movement of the feeding mechanism 121 and the hook mechanism 122 simultaneously, multiple sets of linkage structures need to be arranged centrally on the drive shaft, which makes it difficult to solve the problem of interference between the mechanism movements in a limited space. At the same time, the installation and disassembly processes between the components will also affect each other, resulting in inconvenient maintenance. Moreover, in order to realize the coaxial arrangement of multiple sets of connecting drive mechanisms, the drive shaft must be extended, which not only reduces the rigidity of the drive shaft, but also makes the width of the machine base body 11 in the feeding direction F have to be extended, making the machine base body 11 bulky and occupying the space of the mounting table. However, when the drive function is reasonably distributed to the first drive shaft 131 and the second drive shaft 132, the installation and disassembly of the linkage drive mechanisms on different shafts do not affect each other. At the same time, sufficient adjustment and disassembly space is guaranteed between the linkage mechanisms on the same shaft, thus facilitating later maintenance. Furthermore, arranging the first drive shaft 131 and the second drive shaft 132 roughly vertically only increases the height of the base body 11 in the vertical direction, while having almost no impact on the cross-sectional area of ​​the base body 11 in the horizontal plane. The impact on height can be properly resolved during subsequent installation, i.e., by partially submerging the base body 11 below the worktable surface during installation.

[0056] Figure 4This is a schematic diagram of the first drive shaft 131, the feeding mechanism 121, and the corresponding drive connection mechanism. The drive connection mechanism is divided into a feeding swing branch 141 and a feeding movement branch 142. The feeding swing branch 141 includes a swing connecting rod 14S, which includes a positive and negative thread connecting rod 1411, a first eccentric bearing 1412, and a first joint bearing 1413. One end of the positive and negative thread connecting rod 1411 is hinged to the end of the rear feeding swing arm 1218 away from the sewing end 12S and / or the end of the front feeding swing arm 1219 away from the sewing end 12S. The other end of the feeding movement branch 142 is sleeved on the first drive shaft 131 through the first eccentric bearing 1412. The contact surface between the inner and outer rings of the first eccentric bearing 1412 is spherical, so that the inner and outer rings can swing within a certain range while rotating relative to each other. Therefore, as the first drive shaft 131 rotates, the first eccentric bearing 1412 drives the positive and negative thread connecting rod 1411 to undulate in the vertical plane, which in turn drives the rear feeding swing arm 1218 and the front feeding swing arm 1219 to swing around the feeding swing shaft 1215 in the vertical plane. The length of the positive and negative thread connecting rod 1411 is adjusted by the positive and negative thread at both ends.

[0057] Figure 5 This is a schematic diagram of the hinged end of the forward and reverse thread connecting rod 1411 according to a specific embodiment of the present invention. The forward and reverse thread connecting rod 1411 is connected to the front feeding swing arm 1219 via a first joint bearing 1413. The front feeding swing arm 1219 is provided with a rear feeding swing arm 1218 embedded in it along the feeding direction F, so that the rear feeding swing arm 1218 and the front feeding swing arm 1219 can move synchronously in the vertical direction at the end away from the sewing end 12S, thereby achieving synchronous swinging. In other embodiments, the rear feeding swing arm 1218 and the front feeding swing arm 1219 can be hinged to the forward and reverse thread connecting rod 1411 respectively, or hinged to the forward and reverse thread connecting rod 1411 via additional connecting components.

[0058] The feeding movement branch 142 is hinged to the feeding crank 1422, which is rotatably fixed above the first transmission shaft 131, via the swing link 14S. The feeding crank 1422 rotates in a vertical plane parallel to the feeding direction F. The feeding crank 1422 has at least two handles. The first handle 1423 is connected to the swing link 14S to drive the feeding crank 1422 to swing. The second handle 1424 is directly connected to the rear feeding swing arm 1218 and the front feeding swing arm 1219 via the feeding link 1425 to form a crank-slider motion mechanism, or to drive the rear feeding swing arm 1218 and the front feeding swing arm 1219 through an intermediate transmission mechanism. This enables the rear feeding swing arm 1218 and the front feeding swing arm 1219 to reciprocate along the feeding direction F, guided by the feeding swing shaft 1215.

[0059] In this embodiment, the latter connection method is adopted. The feeding movement branch 142 includes a rotatably fixed second feeding crank 1426, a left feeding connecting rod 1427 connecting the second feeding crank 1426 to the rear feeding swing arm 1218, and a right feeding connecting rod 1428 connecting the second feeding crank 1426 to the front feeding swing arm 1219. That is, the second feeding crank 1426, the front feeding swing arm 1219, and the rear feeding swing arm 1218 respectively form a crank-slider mechanism. The rotation axis of the second feeding crank 1426 is parallel to the rotation axis of the feeding crank 1422, and the second feeding crank 1426 and the feeding crank 1422 are connected by the feeding connecting rod 1425 to form a double crank mechanism. Therefore, the up-and-down swing of the swing link 14S is converted by the feeding crank 1422 into the back-and-forth swing of the second handle 1424 along the feeding direction F. First, the second feeding crank 1426 is driven to swing back and forth through the double crank mechanism. Then, the rear feeding swing arm 1218 and the front feeding swing arm 1219 are driven to reciprocate back and forth along the feeding direction F through the crank-slider mechanism.

[0060] It should be noted that in this embodiment, the reason for using a combination of a series-connected double-crank mechanism and a crank-slider mechanism to achieve the forward and backward movement of the rear feeding swing arm 1218 and the front feeding swing arm 1219 is mainly for the convenience of separately controlling and adjusting the movement of the rear feeding swing arm 1218 and the front feeding swing arm 1219. Specifically, the second feeding crank 1426 includes a left adjusting handle 261 and a right adjusting handle 262 respectively disposed at both ends of its rotating shaft, both of which are provided with a sliding groove 263 pointing in the same direction from their ends toward the rotating shaft. The pivot connecting the left feeding connecting rod 1427 and the left adjusting handle 261 is slidably disposed in the sliding groove 263 on the left adjusting handle 261; the pivot connecting the right feeding connecting rod 1428 and the right adjusting handle 262 is slidably disposed in the sliding groove 263 on the right adjusting handle 262. The left adjusting handle 261 is connected to the second handle 1424 of the feeding crank 1422 via the feeding connecting rod 1425. Therefore, by adjusting the positions of the pivots of the left feeding link 1427 and the right feeding link 1428 in the slide 263, the displacement lengths of the rear feeding arm 1218 and the front feeding arm 1219 along the feeding direction F can be adjusted respectively.

[0061] Figure 6This is a schematic diagram of the single feed step adjustment mechanism 151. The single feed step adjustment mechanism 151 is set at both ends of the second feed crank 1426. The left single feed step adjustment mechanism 151 controls the position of the front feed swing arm 1219 in the groove 263 of the left adjustment handle 261; the right single feed step adjustment mechanism 151 controls the position of the front feed swing arm 1219 in the groove 263 of the left adjustment handle 261. The two single feed step adjustment mechanisms 151 have the same structure and are arranged in a mirror image. Taking the left-end single-feeding step adjustment mechanism 151 as an example, it includes an adjustment crank 1511 rotatably mounted on the shaft of the second feeding crank 1426. The adjustment crank 1511 includes a first manual adjustment handle 15S1 and a second manual adjustment handle 15S2 fixedly connected to each other. The first manual adjustment handle 15S1 is pivotally connected to a third manual adjustment handle 15S3 fixedly connected to the discrete step adjustment knob 1512. The second manual adjustment handle 15S2 is pivotally connected to the front feeding swing arm 1219 via an adjustment connecting rod 1513. When the discrete step adjustment knob 1512 is rotated, the third manual adjustment handle 15S3 drives the adjustment crank 1511 to rotate. The adjustment crank 1511 drives the front feeding swing arm 1219 to move around the feeding swing shaft 1215 in the groove 263 of the left adjustment handle 261 via the adjustment connecting rod 1513, thereby realizing step control.

[0062] Figure 7 This is a schematic diagram of the overall feeding step distance adjustment mechanism 152. Its motion mechanism design is the same as that of the single feeding step distance adjustment mechanism 151, including a rotatable step distance adjustment knob 1521. The step distance adjustment knob 1521 is fixedly connected to the fourth manual adjustment handle 1522, and preferably, the step distance adjustment knob 1521 is coaxial with the rotation axis of the feeding crank 1422 to simplify arrangement and installation. The fourth manual adjustment handle 1522 is pivotally connected to the feeding connecting rod 1425 via the second adjustment connecting rod 1523. The second handle portion 1424 is also provided with a feeding adjustment groove 14G, within which the pivot of the feeding connecting rod 1425 can slide. Thus, when the step adjustment knob 1521 is rotated, the pivot position of the feeding link 1425 is moved within the feeding adjustment groove 14G, thereby controlling the step distance of the feeding link 1425. Since the feeding link 1425 is uniformly connected to the rear feeding swing arm 1218 and the front feeding swing arm 1219, the synchronous adjustment of the rear feeding swing arm 1218 and the front feeding swing arm 1219 is achieved.

[0063] Figure 8This is a schematic diagram of the second drive shaft 132, the hook shaft 1222, and the hook swing branch 143 connecting the two. Since the first drive shaft 131 and the second drive shaft 132 are roughly vertically positioned in a vertical plane, to avoid interference between the movement of the hook swing branch 143 and the first drive shaft 131, the hook swing branch 143 is provided with a transition crank 1431. The shaft of the transition crank 1431 rotates along the feeding direction F, that is, it rotates in a vertical plane perpendicular to the feeding direction F. It has a first transition handle 311 and a second transition handle 312 extending radially from its shaft. The first transition handle 311 is pivotally connected to the end of the second transmission shaft 132 via a first transition link 313. The pivot of the first transition link 313 at the end of the second transmission shaft 132 is eccentric to the rotation axis of the second transmission shaft 132, and this eccentricity can be adjusted by an adjusting screw 315. The second transition handle 312 is hinged to the end of the hook shaft 1222 via a second transition link 314. Specifically, the hinge could be a spherical bearing as described in this embodiment. This mechanism converts the rotation of the second transmission shaft 132 into rotation of the hook shaft 1222 within a certain range in the same plane, thereby achieving the oscillation of the shuttle 1221 at the sewing end 12S. In other arrangements of the first and second transmission shafts 131, there is no interference problem, so the transition crank 1431 can be omitted. Motion transmission can be achieved directly through the hinge of the second transition link 314 to the eccentric connection point of the hook shaft 1222 and the end of the second transmission shaft 132.

[0064] The shuttle 1221 also needs to move within a certain range along the feeding direction F. Figure 9 This is a schematic diagram illustrating the structure by which the shuttle 1221 moves via the feeding swing branch 141. A guide block 1613 is fixedly mounted on the hook shaft 1222. The guide block 1613 has a guide groove 1614, which slides with a guide pin 1612 fixed within the machine base 11 along the feeding direction F, guiding the hook shaft 1222 to move along the intended feeding direction F. The feeding crank 1422 also has a third handle 1429. Since the feeding crank 1422 is located above the hook shaft 1222, the third handle 1429 is preferably positioned downwards. The displacement connecting rod 1611 is pivotally connected to both the third handle 1429 and the guide block 1613. Therefore, when the feeding crank 1422 swings, the hook shaft 1222 will be driven to move in the feeding direction F.

[0065] Figure 10This is a schematic diagram of the thread take-up mechanism 171 of the present invention, which includes cam plates 1711 spaced apart on the first drive shaft 131 facing the sewing end 12S, and a thread-passing seat 1715 disposed on the machine base body 11. The thread-passing seat 1715 is preferably rotatably fixed on the machine base body 11. The thread-passing seat 1715 includes two sets of thread-passing rods 1712 respectively disposed outside the cam plates 1711. The thread-passing rods 1712 extend into the projection range of the cam plates 1711 along the first drive shaft 131 and are provided with thread-passing holes 1716 for passing through the bottom thread. The thread-passing seat 1715 also includes a thread take-up rod 1713 extending into the gap between the two cam plates 1711. The thread take-up rod 1713 is provided with at least one set of thread take-up seams 1714 extending from outside the projection range of the cam plates 1711 to inside the projection range of the cam plates 1711. The bottom thread L passes through the thread hole 1716 on one side, through the thread take-up slit 1714, and then out through the thread hole 1716 on the other side. When the cam plate 1711 is driven to rotate by the first drive shaft 131, its periphery pushes the bottom thread L within the thread take-up slit 1714, thereby changing the length of the bottom thread L between the two thread rods 1712, realizing the tightening and releasing operation of the bottom thread.

[0066] Figure 11 This is a schematic diagram of a sewing machine using the sewing machine base of the present invention. Either the first drive shaft 131 or the second drive shaft 132 can serve as the active drive component of the sewing machine base 1. Therefore, the power component of the sewing machine can be output to either the first drive shaft 131 or the second drive shaft 132 via a transmission system. The figure shows the case where the power is transmitted to the second drive shaft 132 via a synchronous belt. The power component is located within the sewing machine base 21, which, along with the machine body 11, is recessed below the worktable 22, thus avoiding the occupation of operating space.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A sewing machine bed comprising a machine cylinder (12) extending from a machine bed body (11) in a horizontal plane in a feeding direction (F), a feeding mechanism (121) and a thread hooking mechanism (122) being provided in the machine cylinder (12), characterized in that, In the machine base body (11), below the level of the machine cylinder (12), a first transmission shaft (131) and a second transmission shaft (132) are arranged parallel to the machine cylinder (12), and the transmission ratio between the first transmission shaft (131) and the second transmission shaft (132) is fixed. The first transmission shaft (131) and the second transmission shaft (132) are arranged in a vertical direction. One of the first transmission shaft (131) and the second transmission shaft (132) is used to drive the feeding mechanism (121) to complete the feeding movement and the movement of the hook and thread mechanism (122) along the feeding direction (F), and the other is used to drive the hook and thread mechanism (122) to swing around the feeding direction (F). The machine base body (11) comprises a hook and thread swing branch (143), and the hook and thread swing branch (143) is provided with a transition crank (1431) with a rotating shaft along the feeding direction (F). The machine base body (11) comprises a feeding swing branch (141) provided with a swing link (14S).

2. The sewing machine bed of claim 1, wherein The transition crank (1431) has a first transition handle (311) and a second transition handle (312) extending radially from the rotating shaft thereof; The first transition handle (311) is pivoted to the end of the second transmission shaft (132) through a first transition connecting rod (313), and the pivot is eccentrically arranged between the rotating shaft of the second transmission shaft (132); The second transition handle (312) is hingedly connected to the end of the hook and thread shaft (1222) of the hook and thread mechanism (122) through a second transition connecting rod (314).

3. The sewing machine bed of claim 2, wherein The eccentricity between the pivot and the rotating shaft of the second transmission shaft (132) is adjustable.

4. The sewing machine bed of claim 1, wherein The feeding mechanism (121) comprises a front feeding swing arm (1219) and a rear feeding swing arm (1218) arranged along the feeding direction (F); The swing link (14S) comprises a positive and negative tooth connecting rod (1411), a first eccentric bearing (1412), and a first joint bearing (1413) arranged at both ends of the positive and negative tooth connecting rod (1411), respectively; One end of the positive and negative tooth connecting rod (1411) is sleeved on the first transmission shaft (131) through the first eccentric bearing (1412), and the other end is hingedly connected to one end of the rear feeding swing arm (1218) and / or one end of the front feeding swing arm (1219).

5. The sewing machine bed of claim 4, wherein The positive and negative tooth connecting rod (1411) is connected to the front feeding swing arm (1219) through the first joint bearing (1413), and the front feeding swing arm (1219) is provided with a groove along the feeding direction (F) for embedding one end of the rear feeding swing arm (1218).

6. The sewing machine bed of claim 4, wherein The machine base body (11) comprises a feeding movement branch (142); The feeding movement branch (142) is hingedly connected to a feeding crank (1422) which is rotationally fixed above the first transmission shaft (131) through the swing link (14S), and the feeding crank (1422) rotates in a vertical plane parallel to the feeding direction (F), The feeding crank (1422) has at least two handle portions extending radially from the rotation axis thereof: a first handle portion (1423) and a second handle portion (1424); The first handle portion (1423) is hinged to the swing link (14S), and the second handle portion (1424) is used to drive the rear feeding swing arm (1218) and the front feeding swing arm (1219) to reciprocate along the feeding direction (F) through a feeding link (1425).

7. The sewing machine bed of claim 6, wherein The feeding moving branch (142) comprises a rotation-fixed second feeding crank (1426), a left adjusting handle (261) connected to the second feeding crank (1426) and a left feeding link (1427) connected to the rear feeding swing arm (1218), and a right adjusting handle (262) connected to the second feeding crank (1426) and a right feeding link (1428) connected to the front feeding swing arm (1219); The left adjusting handle (261) and / or the right adjusting handle (262) are pivoted to one end of the feeding link (1425), and the other end of the feeding link (1425) is pivoted to the second handle portion (1424).

8. The sewing machine bed of claim 7, wherein Single feeding step adjusting mechanisms (151) are arranged at both axial ends of the second feeding crank (1426); two groups of the single feeding step adjusting mechanisms (151) are mirror arranged; The single feeding step adjusting mechanism (151) at the left end comprises a rotationally arranged adjusting crank (1511) and a discrete step adjusting knob (1512), and the adjusting crank (1511) comprises a first manual adjusting handle (15S1) and a second manual adjusting handle (15S2) fixed to each other; The first manual adjusting handle (15S1) is pivoted to a third manual adjusting handle (15S3) fixed to the discrete step adjusting knob (1512); Adjusting links (1513) are respectively pivoted to the second manual adjusting handle (15S2) and the front feeding swing arm (1219).

9. A sewing machine characterized by comprising: The sewing machine base comprises the sewing machine base (21) and the machine base body (11), and the machine base body (11) is at least partially sunk below the worktable of the sewing machine.

Images