CN218842533U

CN218842533U - Sewing machine base and sewing machine

Info

Publication number: CN218842533U
Application number: CN202222888601.3U
Authority: CN
Inventors: 林小玲; 曾顺生
Original assignee: Anqing Fuling Machinery Technology Co ltd
Current assignee: Zhejiang Sewpower Automation Technology Co ltd
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2023-04-11
Anticipated expiration: 2032-10-31

Abstract

The utility model provides a sewing machine frame and sewing machine, wherein, the sewing machine frame includes from the frame body along the barrel that pay-off direction extends in the horizontal plane, be provided with feeding mechanism and crocheting mechanism in the barrel this internal, in be provided with all to be on a parallel with under the place horizontal plane of barrel first transmission shaft and the secondary drive axle of barrel, one of them is used for the drive feeding mechanism accomplishes the pay-off motion and crocheting mechanism follows the removal of pay-off direction, another is used for the drive crocheting mechanism realizes winding the swing of pay-off direction. The sewing machine base is used for driving the feeding mechanism and the thread hooking mechanism in the machine barrel to be arranged below the horizontal plane of the machine barrel, so that the machine base body is prevented from occupying the space above the horizontal plane of the machine barrel, the view above the machine barrel is wide, and the moving range is not divided by the machine base body.

Description

Sewing machine base and sewing machine

Technical Field

The utility model relates to a sewing machine technical field, concretely relates to sewing machine frame and sewing machine.

Background

The industrial sewing machine is one of key devices in the clothing industry, and generally has a suspended machine barrel so as to sew the edge of cloth under different use scenes as far as possible, and particularly when the opposite sides of the cloth are sewed to form a cylindrical product, the machine barrel can extend into the cylindrical finished product, so that the industrial sewing machine is more practical.

In the prior art, for example, chinese patent publication No. CN206448032U entitled "forward manual adjusting device for crank arm type sewing machine" and utility model patent publication No. CN101570922B entitled "needle protection structure for four-needle six-thread sewing machine", the machine head is disposed above the machine barrel, and the transmission mechanism is disposed above the tail portion of the machine barrel, so that the tail portion of the machine barrel has an upward protrusion or a frame for connecting a driving mechanism or a machine head transmission system. Maintaining these protrusions or frames above the base affects the operator's view of the sewing position and affects the range of movement of the operator's upper limbs.

The applicant of the present application provides a sinking type sewing machine in the application of the chinese utility model with application number "2022226357104", wherein the casing connecting the machine head and the machine base and the transmission mechanism in the casing are disposed below the plane of the machine barrel, so as to avoid the problems of the prior art that the visual field of the operator is blocked and the range of the upper limbs is limited, but the application does not disclose the specific structural form of the machine base part.

SUMMERY OF THE UTILITY MODEL

To current sewing machine because arrange the field of vision that drive mechanism leads to above the barrel tail and be obstructed with the technical problem that the upper limbs activity is limited, the utility model provides a sewing machine frame and sewing machine.

The technical scheme of the utility model provides a sewing machine base, include the barrel that extends along the pay-off direction in the horizontal plane from the frame body, be provided with feeding mechanism and crocheting mechanism in the barrel, in the frame body, be provided with first transmission shaft and the second transmission shaft that all is on a parallel with the barrel below the place horizontal plane of barrel, the drive ratio is fixed between first transmission shaft and the second transmission shaft;

one of the first transmission shaft and the second transmission shaft is used for driving the feeding mechanism to complete feeding movement and the thread hooking mechanism to move along the feeding direction, and the other one of the first transmission shaft and the second transmission shaft is used for driving the thread hooking mechanism to swing around the feeding direction.

Specifically, the machine base body comprises a hook line swinging branch;

the hook line swinging branch is provided with a transition crank with a rotating shaft along the feeding direction, and the transition crank is provided with a first transition handle and a second transition handle which respectively extend from the rotating shaft along the radial direction;

the first transition handle is pivoted with the end part of the second transmission shaft through a first transition connecting rod, and a pivot is eccentrically arranged with a rotating shaft of the second transmission shaft;

the second transition handle is hinged with the end part of a thread hooking shaft of the thread hooking mechanism through a second transition connecting rod.

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

Specifically, the machine base body comprises a feeding swing branch provided with a swing connecting rod;

the feeding mechanism 121 comprises a front feeding swing arm 1219 and a rear feeding swing arm 1218 which are arranged along the feeding direction F;

the swing connecting rod comprises a positive and negative tooth connecting rod, and a first eccentric bearing and a first joint bearing which are respectively arranged at two ends of the positive and negative tooth connecting rod;

one end of the positive and negative tooth connecting rod is sleeved on the first transmission shaft through a first eccentric bearing, and the other end of the positive and negative tooth connecting rod is hinged to one end of the rear feeding swing arm and/or one end of the front feeding swing arm.

Specifically, the positive and negative tooth connecting rod is connected to the front feeding swing arm through the first joint bearing, the front feeding swing arm is provided with an edge in the feeding direction, and one end of the rear feeding swing arm is embedded into the front feeding swing arm.

Specifically, the machine base body comprises a feeding moving branch;

the feeding moving branch is hinged with a feeding crank which is rotationally fixed above the first transmission shaft through a swinging connecting rod, the feeding crank rotates in a vertical plane parallel to the feeding direction, and the feeding crank at least has two handle parts which radially extend from a rotating shaft of the feeding crank: a first handle portion, a second handle portion;

the first handle portion is hinged to the swing connecting rod, and the second handle portion is used for driving the rear feeding swing arm and the front feeding swing arm to move in a reciprocating mode in the feeding direction through the feeding connecting rod.

Specifically, the feeding moving branch comprises a second feeding crank which is rotationally fixed, a left feeding connecting rod which is connected with a left adjusting handle of the second feeding crank and the rear feeding swing arm, and a right feeding connecting rod which is connected with a right adjusting handle of the second feeding crank and the front feeding swing arm;

the left adjusting handle and/or the right adjusting handle is/are pivoted with one end of the feeding connecting rod 1425, and the other end of the feeding connecting rod 1425 is pivoted with the second handle.

Specifically, single-feeding step pitch adjusting mechanisms are arranged at two axial ends of the second feeding crank; the two groups of single feeding step pitch adjusting mechanisms are arranged in a mirror image manner;

the single-feeding step pitch adjusting mechanism at the left end comprises an adjusting crank and a discrete step pitch adjusting knob 1512, wherein the adjusting crank comprises a first manual adjusting handle and a second manual adjusting handle which are fixedly connected with each other;

the first manual adjusting handle is pivoted with a third manual adjusting handle fixedly connected with the discrete step pitch adjusting knob;

the adjusting connecting rod 1513 is respectively pivoted with the second manual adjusting handle and the front feeding swing arm.

The feeding device comprises a first handle part, a second handle part, a first manual adjusting handle, a second manual adjusting handle, a total feeding step distance adjusting mechanism and a second manual adjusting handle, wherein the first handle part is fixedly connected with the first handle part, the second handle part is fixedly connected with the second handle part, the first manual adjusting handle is pivoted with the first handle part through a first adjusting connecting rod, the second manual adjusting handle is fixedly connected with the second handle part through a second adjusting connecting rod, and a pivot of the first handle part is arranged in a feeding adjusting chute of the second handle part in a sliding mode.

Specifically, the thread hooking mechanism is provided with a thread hooking shaft in the machine barrel 12 along the feeding direction F, a guide block is fixed on the thread hooking shaft 1222, and a guide groove formed on the guide block is in sliding fit with a guide pin fixed in the machine base body along the feeding direction;

the feeding crank is provided with a third handle part, and the displacement connecting rod is respectively pivoted with the third handle part and the guide block.

Specifically, two cam pieces are arranged at intervals at one end, facing the machine barrel, of the first transmission shaft; the machine seat body is provided with a threading seat;

the threading seat comprises two groups of threading rods which are respectively arranged at the outer sides of the cam pieces, and threading holes for threading bottom threads are formed in the parts of the threading rods, which extend into the projection range of the cam pieces along the first transmission shaft;

the threading seat further comprises a thread take-up lever extending into a gap between the two cam pieces, and at least one group of thread take-up seams extending from the outside of the projection range of the cam pieces to the inside of the projection range of the cam pieces are arranged on the thread take-up lever.

Preferably, the first transmission shaft and the second transmission shaft are arranged in a vertical direction.

The technical scheme of the utility model a sewing machine is provided, this sewing machine includes above-mentioned arbitrary one the sewing frame.

Specifically, the power part of the sewing machine is output to the first transmission shaft or the second transmission shaft of the sewing machine base through the transmission system, and the sewing machine base of the sewing machine and the machine base body of the sewing machine base are at least partially immersed in the lower portion of the workbench of the sewing machine.

The utility model discloses a sewing frame will be arranged in below the barrel place horizontal plane of arranging of feeding mechanism and crochet hook mechanism in the drive barrel, consequently cancelled to the frame body occupy in the space of barrel place horizontal plane top to make the barrel top field of vision open, home range is not cut apart by the frame body.

Drawings

FIG. 1 is a general view of a sewing machine frame according to the present invention;

FIG. 2 is a partial schematic view of the internal structure of the sewing end of the present invention;

FIG. 3 is a schematic view of the internal structure of the sewing machine frame of the present invention;

fig. 4 is a schematic view of the first transmission shaft, the feeding mechanism and the corresponding driving connection mechanism of the present invention;

fig. 5 is a schematic view of the hinge end of the positive and negative teeth connecting rod of the present invention;

fig. 6 is a schematic structural view of a single feeding step adjusting mechanism of the present invention;

fig. 7 is a schematic structural view of the total feeding step adjusting mechanism of the present invention;

fig. 8 is a schematic structural view of the second transmission shaft, the hook shaft and the hook swinging branch connecting the two of the present invention;

fig. 9 is a schematic structural view of the present invention for realizing the movement of the shuttle via the feeding swing branch;

FIG. 10 is a schematic view of the thread take-up mechanism of the present invention;

fig. 11 is a schematic view of a sewing machine using the sewing machine base of the present invention.

In the figure, the position of the upper end of the main shaft,

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, wherein the dimensional ratios in the drawings do not represent actual dimensional ratios, and are only used for representing relative positional relationships and connection relationships between components, and the components with the same names or the same reference numbers represent similar or identical structures and are only used for illustrative purposes.

Fig. 1 is an overall schematic view of the sewing machine base 1 according to the present invention, which illustrates the posture of the sewing machine base 1 at the normal installation position, and at this time, the H direction in the figure is the horizontal direction, and the V direction is the vertical direction. It comprises a stand body 11 and a barrel 12 extending in a feeding direction F in a horizontal plane from the stand body 11. Typically, the sewing end 12S of the barrel 12 remote from the frame body 11 is provided with a feeding mechanism 121 and a thread hooking mechanism 122. The feeding mechanism 121 is used for conveying the cloth on the machine barrel 12 along the horizontal direction H, and the thread hooking mechanism 122 is used for being matched with a sewing needle of the machine head to interweave the upper thread and the bottom thread. The structural realization of the feeding mechanism 121 and the thread hooking mechanism 122 is a mature technology in the prior art.

Fig. 2 is a partial schematic view of the internal structure at the sewing end 12S. In the sewing end 12S, the feeding mechanism 121 includes a front feeding dog 1211 and a rear feeding dog 1212 which are provided forward and backward in the feeding direction F toward the bed body 11, and a front feeding swing arm 1219 and a rear feeding swing arm 1218 which are provided in the barrel 12 in parallel to the extending direction of the barrel 12. For convenience of arrangement, the rear feeding swing arm 1218 and the front feeding swing arm 1219 are generally arranged side by side along the feeding direction F as shown in fig. 2, the rear feeding swing arm 1218 and the front feeding swing arm 1219 are provided with chutes along the feeding direction F at the same position in the feeding direction F, and the feeding swing shaft 1215 is rotatably fixed to the barrel 12 through the chutes of the rear feeding swing arm 1218 and the front feeding swing arm 1219. The rear feeder swing arm 1218 and the front feeder swing arm 1219 are therefore constrained to slide in the feeding direction F under the constraint of the feeder swing axis 1215 and are rotatable about the feeder swing axis 1215.

Under the proper design of a transmission mechanism for driving the rear feeding swing arm 1218 and the front feeding swing arm 1219 in the base body 11, the front feeding tooth 1211 and the rear feeding tooth 1212 complete a complete circular working trajectory formed by a forward stroke g1 and a backward stroke g2 illustrated in fig. 2, wherein the forward stroke g1 completes cloth conveying, and the backward stroke g2 completes idle-load resetting. The hook thread mechanism 122 is provided with a shuttle 1221 below the rear feeding swing arm 1218 and the front feeding swing arm 1219, the shuttle 1221 being provided at an end of the hook thread shaft 1222 at the sewing end 12S. The hook thread shaft 1222 can rotate around the central axis thereof and move limitedly along the central axis thereof, so that the shuttle 1221 performs a composite motion of the movement along the central axis of the hook thread shaft 1222 and the swing around the central axis of the hook thread shaft 1222 in the space below the rear feeding swing arm 1218 and the front feeding swing arm 1219, and cooperates with the sewing needle of the machine head to realize the loop interweaving of the upper thread and the bottom thread.

Fig. 3 is a schematic view of the overall structure of the inside of the sewing machine bed 1, in which a dotted line part is a contour of the sewing machine bed 1 shown in comparison with the mounting position of the internal structure. In the sewing machine base 1, a first transmission shaft 131 and a second transmission shaft 132 are arranged below the horizontal plane of the cylinder 12 and parallel to the cylinder 12, the first transmission shaft 131 and the second transmission shaft 132 realize fixed transmission ratio rotation through a first transmission device 133, in the embodiment of fig. 3, the first transmission device 133 is a synchronous belt connecting the first transmission shaft 131 and the second transmission shaft 132, and the transmission ratio of the synchronous belt is 1, that is, the first transmission shaft 131 and the second transmission shaft 132 rotate synchronously. The relative position in the vertical plane between the first transmission shaft 131 and the second transmission shaft 132 is in principle not particularly required, and fig. 3 shows the first transmission shaft 131 and the second transmission shaft 132 arranged substantially from top to bottom in the vertical direction V. At this time, the height of the housing body 11 below the cylinder 12 is determined by the second transmission shaft 132 at the bottom, but the sectional profile of the housing body 11 along the horizontal plane can be reduced, which is advantageous for the miniaturization of the apparatus and the optimization of the outer shape and the casing design of the housing body 11.

One of the first transmission shaft 131 and the second transmission shaft 132 is used for driving the feeding mechanism 121 to move along the working track and realizing the movement of the shuttle hook 1221 along the central axis of the hook line shaft 1222, and the other is used for driving the hook line mechanism 122 to realize the swing. When the movement of the feeding mechanism 121 and the thread hooking mechanism 122 is simultaneously realized by using a single driving shaft, a plurality of groups of connecting rod structures need to be intensively arranged on the driving shaft, so that the problem of mechanism movement interference in a limited space is difficult to solve, and meanwhile, the installation and disassembly processes of parts can also influence each other, so that the maintenance is inconvenient; in addition, in order to realize the coaxial arrangement of a plurality of groups of connecting driving mechanisms, the driving shafts cannot be prolonged, so that the rigidity of the driving shafts is reduced, the width of the machine base body 11 in the feeding direction F cannot be prolonged, the whole machine base body 11 is overstaffed, and the space of a mounting table is occupied. And after the driving function is reasonably distributed to the first transmission shaft 131 and the second transmission shaft 132, the mounting and dismounting of the connecting rod driving mechanisms on different shafts are not influenced mutually, and meanwhile, enough adjusting and dismounting space is ensured between the connecting rod mechanisms on the same shaft, so that the later maintenance is facilitated. Further, arranging the first transmission shaft 131 and the second transmission shaft 132 substantially vertically up and down extends only the height of the housing body 11 in the vertical direction, and has little influence on the sectional profile area of the housing body 11 in the horizontal plane. The influence on the height can be properly solved when the machine base is installed later, namely, the machine base body 11 is partially sunk below the working table surface when the machine base is installed.

Fig. 4 is a schematic diagram of the first transmission shaft 131, the feeding mechanism 121 and the corresponding drive connection mechanism. The driving connection mechanism is divided into a feeding swing branch 141 and a feeding moving branch 142. The feeding swing branch 141 includes a swing link 14S including a positive and negative tooth link 1411, a first eccentric bearing 1412, and a first knuckle bearing 1413. One end of the positive and negative tooth connecting rod 1411 is hinged to one end of the rear feeding swing arm 1218 far away from the sewing end 12S and/or one end of the front feeding swing arm 1219 far away from the sewing end 12S, the other end of the feeding moving branch 142 is sleeved on the first transmission shaft 131 through a first eccentric bearing 1412, and a contact surface between an inner ring and an outer ring of the first eccentric bearing 1412 is a spherical surface, so that the inner ring and the outer ring can be allowed to swing within a certain range while rotating relatively. Therefore, as the first transmission shaft 131 rotates, the first eccentric bearing 1412 drives the front and back tooth connecting rod 1411 to move up and down in the vertical plane, and further 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 tooth connecting rod 1411 is adjusted through positive and negative tooth threads at two ends.

Fig. 5 is the utility model discloses a positive and negative tooth connecting rod 1411 hinged end ' S schematic diagram, positive and negative tooth connecting rod 1411 is connected to preceding pay-off swing arm 1219 through first joint bearing 1413, be provided with on the preceding pay-off swing arm 1219 along pay-off direction F direction, during sewing end 12S ' S one end embedding is kept away from to back pay-off swing arm 1218 to make back pay-off swing arm 1218 and preceding pay-off swing arm 1219 two can be in vertical direction synchronous motion keeping away from sewing end 12S ' S one end, realize the synchronous oscillation. In other embodiments, the rear feeding swing arm 1218 and the front feeding swing arm 1219 may be hinged to the front and back teeth link 1411, respectively, or hinged to the front and back teeth link 1411 via an additional connecting member.

The feeding moving branch 142 is hinged to a feeding crank 1422 rotatably fixed above the first transmission shaft 131 through a 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 handle portions, wherein the first handle portion 1423 is connected to the swing link 14S to drive the feeding crank 1422 to swing, the second handle portion 1424 is directly connected to the rear feeding swing arm 1218 and the front feeding swing arm 1219 through a feeding link 1425 to form a crank-slider motion mechanism or is transitionally driven by an intermediate transmission mechanism to drive the rear feeding swing arm 1218 and the front feeding swing arm 1219, so as to drive the rear feeding swing arm 1218 and the front feeding swing 1219 to reciprocate along the feeding direction F guided by the feeding swing shaft 1215.

In this embodiment, the feeding moving branch 142 includes a second feeding crank 1426 fixed to rotate, a left feeding link 1427 connecting the second feeding crank 1426 and the rear feeding swing arm 1218, and a right feeding link 1428 connecting the second feeding crank 1426 and the front feeding swing arm 1219. That is, the second feeder crank 1426 forms a slider-crank mechanism with the front feeder swing arm 1219 and the rear feeder swing arm 1218, respectively. 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 a feeding connecting rod 1425 to form a double crank mechanism. Therefore, the vertical swing of the swing link 14S is converted into the vertical swing of the second handle 1424 along the feeding direction F by the feeding crank 1422, and then the second feeding crank 1426 is driven to swing back and forth by the double crank mechanism, and then the back feeding swing arm 1218 and the front feeding swing arm 1219 are driven to reciprocate back and forth along the feeding direction F by the crank-slider mechanism.

It should be noted that in this embodiment, the back-and-forth movement of the back feeding swing arm 1218 and the front feeding swing arm 1219 is realized by the combination of the serial double crank mechanism and the slider-crank mechanism, mainly for the consideration of conveniently controlling and adjusting the movement of the back feeding swing arm 1218 and the front feeding swing arm 1219 respectively. That is, the second feeding crank 1426 includes a left adjustment handle 261 and a right adjustment handle 262 respectively provided at both ends of the rotation shaft thereof, and both are provided with the sliding grooves 263 directed in the same direction of the rotation shaft from the ends thereof. Wherein, the pivot of the left feeding connecting rod 1427 connected with the left adjusting handle 261 can be arranged in the sliding groove 263 on the left adjusting handle 261 in a sliding way; the pivot of the right feed link 1428 connected to the right adjustment lever 262 is slidably disposed in the slide groove 263 on the right adjustment lever 262. The left adjustment handle 261 is connected to a second handle 1424 of the feed crank 1422 via a feed link 1425. Therefore, by adjusting the positions of the pivot of the left feeding link 1427 and the pivot of the right feeding link 1428 in the chute 263, the displacement lengths of the rear feeding swing arm 1218 and the front feeding swing arm 1219 in the feeding direction F can be adjusted.

Fig. 6 is a schematic structural view of the single feeding pitch adjusting mechanism 151. The single feeding step adjusting mechanisms 151 are arranged at two axial ends of the second feeding crank 1426, and the left-end single feeding step adjusting mechanism 151 controls the position of the front feeding swing arm 1219 in the chute 263 of the left adjusting handle 261; the right-end single feeding step distance adjusting mechanism 151 controls the position of the front feeding swing arm 1219 in the chute 263 of the left adjusting handle 261, and the two single feeding step distance adjusting mechanisms 151 have the same structure and are arranged in a mirror image manner. Taking the single feeding step pitch adjusting mechanism 151 at the left end as an example, the single feeding step pitch adjusting mechanism includes an adjusting crank 1511 rotatably disposed on the rotating shaft of the second feeding crank 1426, the adjusting crank 1511 includes a first manual adjusting handle 15S1 and a second manual adjusting handle 15S2 fixedly connected with each other, wherein the first manual adjusting handle 15S1 is pivotally connected to a third manual adjusting handle 15S3 fixedly connected to the discrete step pitch adjusting knob 1512, and the second manual adjusting handle 15S2 is pivotally connected to the front feeding swing arm 1219 through an adjusting link 1513. When the discrete step adjustment knob 1512 is rotated, the third manual adjustment handle 15S3 drives the adjustment crank 1511 to rotate, and the adjustment crank 1511 drives the front feeding swing arm 1219 to move around the feeding swing shaft 1215 in the chute 263 of the left adjustment handle 261 through the adjustment link 1513, so as to realize step control.

Fig. 7 is a schematic structural view of the total feeding pitch adjusting mechanism 152. The motion mechanism is designed to be partially the same as the single feeding step distance adjusting mechanism 151, and comprises a step distance adjusting knob 1521 which is rotatably arranged, wherein the step distance adjusting knob 1521 is fixedly connected with a fourth manual adjusting handle 1522, and the optimal step distance adjusting knob 1521 is coaxial with the rotating shaft of the feeding crank 1422 so as to simplify the arrangement and installation. The fourth manual adjustment handle 1522 is pivotally connected to the feeding link 1425 via a second adjustment link 1523, and the second handle 1424 is also provided with a feeding adjustment chute 14G, and the pivot of the feeding link 1425 is slidably disposed in the feeding adjustment chute 14G. Therefore, when the pitch adjustment knob 1521 is rotated, the pivot position of the feeding connecting rod 1425 is driven to move in the feeding adjustment chute 14G, so as to control the moving pitch of the feeding connecting rod 1425, and since the feeding connecting rod 1425 is uniformly connected to the rear feeding swing arm 1218 and the front feeding swing arm 1219, the rear feeding swing arm 1218 and the front feeding swing arm 1219 are synchronously adjusted.

Fig. 8 is a structural diagram of the second transmission shaft 132, the hook shaft 1222, and the hook swing branch 143 connecting the two. Since the first transmission shaft 131 and the second transmission shaft 132 are disposed substantially up and down in a vertical plane, in order to avoid the interference between the movement of the hook line swing branch 143 and the first transmission shaft 131, the hook line swing branch 143 is provided with a transition crank 1431, a rotation shaft of the transition crank 1431 is along the feeding direction F, that is, it rotates in a vertical plane perpendicular to the feeding direction F, and it has a first transition handle 311 and a second transition handle 312 extending radially from the rotation shaft thereof. Wherein the first transition handle 311 is pivotally connected to the end of the second transmission shaft 132 through a first transition link 313, and the first transition link 313 is eccentric between the pivot of the end of the second transmission shaft 132 and the rotation shaft of the second transmission shaft 132, and the eccentricity can be adjusted by an adjusting screw 315; the second transition handle 312 is hinged to the end of the hook line shaft 1222 through the second transition link 314, and the specific hinge manner may be a joint bearing in this embodiment. The above mechanism can convert the rotation of the second transmission shaft 132 into the rotation of the in-plane hook bobbin 1222 within a certain amplitude of the axis, thereby realizing the swing of the shuttle 1221 at the sewing end 12S thereof. In other arrangements of the first transmission shaft 131 and the second transmission shaft 132, there is no interference problem, and the transition crank 1431 can be omitted, i.e. the motion transmission is realized directly by hinging the second transition connecting rod 314 with the hook wire shaft 1222 and the eccentric connecting point of the end of the second transmission shaft 132.

The shuttle 1221 needs to move in a certain amplitude along the feeding direction F at the same time, and fig. 9 is a schematic structural diagram of the shuttle 1221 moving through the feeding swing branch 141. The hooking shaft 1222 is fixedly provided with a guide block 1613, the guide block 1613 is provided with a guide slot 1614, and the guide slot 1614 is slidably engaged with a guide pin 1612 fixed in the housing body 11 along the feeding direction F to guide the hooking shaft 1222 to move along the expected feeding direction F. The feed crank 1422 also has a third shank portion 1429. Since the feed crank 1422 is located above the hook wire shaft 1222, the third shank portion 1429 is preferably disposed downwardly, and the displacement link 1611 is pivotally connected to the third shank portion 1429 and the guide block 1613, respectively. The hook bobbin 1222 will be carried along in the feeding direction F when the feeding crank 1422 swings.

Fig. 10 is a schematic view of the thread take-up mechanism 171 of the present invention, which includes a cam piece 1711 disposed at an interval facing one end of the sewing end 12S of the first transmission shaft 131, and a thread seat 1715 disposed on the base body 11, wherein the thread seat 1715 is preferably fixed to the base body 11 in a rotating manner. The thread passing base 1715 comprises two groups of thread passing rods 1712 which are respectively arranged at the outer sides of the cam pieces 1711, thread passing holes 1716 which are used for passing bottom threads are arranged in the projection range of the thread passing rods 1712 which extend into the cam pieces 1711 along the first transmission shaft 131, the thread passing base 1715 further comprises a thread taking-up rod 1713 which extends into the gap between the two cam pieces 1711, and at least one group of thread taking-up slits 1714 which extend into the projection range of the cam pieces 1711 from the outer side of the projection range of the cam pieces 1711 are arranged on the thread taking-up rod 1713. The bottom thread L passes through the thread-taking-up slit 1714 through the thread-passing hole 1716 on one side and then passes out through the thread-passing hole 1716 on the other side. When the cam 1711 is driven to rotate by the first transmission shaft 131, the periphery thereof pushes and moves the bobbin thread L in the thread take-up slit 1714, thereby changing the length of the bobbin thread L between the two thread take-up levers 1712 and realizing the operation of tightening and releasing the bobbin thread.

Fig. 11 is a schematic view of a sewing machine using the sewing machine base of the present invention. One of the first transmission shaft 131 and the second transmission shaft 132 can be used as an active driving part of the sewing machine base 1, so that the power part of the sewing machine can be output to the first transmission shaft 131 or the second transmission shaft 132 through a transmission system, the figure shows the condition of transmitting to the second transmission shaft 132 through a synchronous belt, the power part is arranged in the sewing machine base 21, and the sewing machine base 21 and the machine base body 11 are arranged under the workbench 22 in a sinking way, thereby avoiding the occupation of the operation space.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art 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 cylinder (12) extending in a feeding direction (F) in a horizontal plane from a bed body (11), a feeding mechanism (121) and a thread hooking mechanism (122) being provided in said cylinder (12), characterized in that a first transmission shaft (131) and a second transmission shaft (132) both parallel to said cylinder (12) are provided in said bed body (11) below the horizontal plane of said cylinder (12), the transmission ratio between said first transmission shaft (131) and said second transmission shaft (132) being fixed;

one of the first transmission shaft (131) and the second transmission shaft (132) is used for driving the feeding mechanism (121) to complete feeding movement and the thread hooking mechanism (122) to move along the feeding direction (F), and the other one of the first transmission shaft and the second transmission shaft is used for driving the thread hooking mechanism (122) to swing around the feeding direction (F).

2. Sewing machine base as in claim 1, characterized in that said base body (11) comprises a crochet swing branch (143);

the hook line swinging branch (143) is provided with a transition crank (1431) with a rotating shaft along the feeding direction (F), and the transition crank (1431) is provided with a first transition handle (311) and a second transition handle (312) which respectively extend out from the rotating shaft along the radial direction;

the first transition handle (311) is pivoted with the end part of the second transmission shaft (132) through a first transition connecting rod (313), and a pivot is eccentrically arranged with a rotating shaft of the second transmission shaft (132);

the second transition handle (312) is hinged with the end part of a hook wire shaft (1222) of the hook wire mechanism (122) through a second transition connecting rod (314).

3. Sewing machine base as claimed in claim 2, characterized in that the eccentricity between said pivot and the axis of rotation of said second transmission shaft (132) is adjustable.

4. Sewing machine base as in claim 1, characterized in that said base body (11) comprises a feed oscillating branch (141) provided with an oscillating link (14S);

the feeding mechanism (121) comprises a front feeding swing arm (1219) and a rear feeding swing arm (1218) which are arranged along the feeding direction (F);

the swing connecting rod (14S) comprises a positive and negative tooth connecting rod (1411), a first eccentric bearing (1412) and a first joint bearing (1413), wherein the first eccentric bearing (1412) and the first joint bearing are respectively arranged at two ends of the positive and negative tooth connecting rod (1411);

one end of the positive and negative tooth connecting rod (1411) is sleeved on the first transmission shaft (131) through a first eccentric bearing (1412), and the other end of the positive and negative tooth connecting rod is hinged to one end of the rear feeding swing arm (1218) and/or one end of the front feeding swing arm (1219).

5. Sewing machine base according to claim 4, characterized in that said counter-toothed connecting rod (1411) is connected to said front feed oscillating arm (1219) by means of said first articulated bearing (1413), said front feed oscillating arm (1219) being provided with a bearing in the feed direction (F), said rear feed oscillating arm (1218) being embedded at one end in said bearing.

6. Sewing machine base as in claim 4, characterized in that said base body (11) comprises a feed movement branch (142);

the feeding movement branch (142) is hinged by means of a swinging connecting rod (14S) to a feeding crank (1422) rotationally fixed above the first transmission shaft (131), the feeding crank (1422) rotates in a vertical plane parallel to the feeding direction (F), the feeding crank (1422) has at least two shanks radially extending from its rotation axis: a first handle portion (1423), a second handle portion (1424);

the first handle part (1423) is hinged with the swing connecting rod (14S), and the second handle part (1424) is used for driving the rear feeding swing arm (1218) and the front feeding swing arm (1219) to reciprocate along the feeding direction (F) through a feeding connecting rod (1425).

7. The sewing machine bed according to claim 6, characterized in that the feed movement branch (142) comprises a second feed crank (1426) rotationally fixed, a left feed link (1427) connecting a left adjustment handle (261) of the second feed crank (1426) with the rear feed swing arm (1218), a right feed link (1428) connecting a right adjustment handle (262) of the second feed crank (1426) with the front feed swing arm (1219);

the left adjusting handle (261) and/or the right adjusting handle (262) are/is pivoted with one end of the feeding connecting rod (1425), and the other end of the feeding connecting rod (1425) is pivoted with the second handle part (1424).

8. Sewing machine base as claimed in claim 7, characterized in that at both axial ends of said second feed crank (1426) there are provided single feed step adjustment mechanisms (151); the two groups of single feeding step adjusting mechanisms (151) are arranged in a mirror image manner;

the single-feeding step distance adjusting mechanism (151) at the left end comprises an adjusting crank (1511) and a discrete step distance adjusting knob (1512), wherein the adjusting crank (1511) comprises a first manual adjusting handle (15S 1) and a second manual adjusting handle (15S 2) which are fixedly connected with each other;

the first manual adjusting handle (15S 1) is pivoted with a third manual adjusting handle (15S 3) fixedly connected with the discrete step pitch adjusting knob (1512);

the adjusting connecting rod (1513) is respectively pivoted with the second manual adjusting handle (15S 2) and the front feeding swing arm (1219).

9. Sewing machine base according to any of the claims 1 to 8, characterised in that said first transmission shaft (131) and said second transmission shaft (132) are arranged in a vertical direction.

10. A sewing machine comprising a sewing machine bed according to any of claims 1 to 9, wherein the power unit of the sewing machine is output to the first drive shaft (131) or the second drive shaft (132) of the sewing machine bed via a drive train, and wherein the sewing machine bed (21) and the bed body (11) of the sewing machine bed are at least partially disposed so as to sink below the table (22) of the sewing machine.