CN217298208U

CN217298208U - Sewing machine lower supply adjusting device and sewing machine

Info

Publication number: CN217298208U
Application number: CN202221001276.8U
Authority: CN
Inventors: 李卫超; 杨聪聪; 张华辉; 赵林蔚
Original assignee: Jack Technology Co Ltd
Current assignee: Jack Technology Co Ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-08-26
Anticipated expiration: 2032-04-28

Abstract

The utility model relates to a supply adjusting device and sewing machine under sewing machine, supply adjusting device including drive assembly, gauge needle drive mechanism and supply drive mechanism down under the sewing machine, wherein: the driving assembly comprises a driving element, a first cam and a second cam; the needle pitch transmission mechanism comprises a first roller and a needle pitch transmission assembly; the lower supply transmission mechanism comprises a second roller and a lower supply transmission assembly; when the driving element is in a first rotating state, the first roller rolls on the needle pitch adjusting contour surface, and the second roller rolls on the second idle running surface; when the driving element is in a second rotating state, the first roller rolls on the first idle running surface, and the second roller rolls on the lower adjusting contour surface; the utility model provides a supply adjusting device under sewing machine drives feed dog frame and differential dog frame orientation through lifting teeth mechanism and keeps away from the inboard direction slope of faller, makes feed dog and differential tooth fall to the faller below the surface, is convenient for carry out the operation of adding of different thickness cloth on the faller.

Description

Sewing machine lower supply adjusting device and sewing machine

Technical Field

The utility model relates to a sewing machine technical field especially relates to a sewing machine supplies adjusting device and sewing machine down.

Background

In the existing sewing machine, a feed dog is fixedly connected to a feed dog frame, a differential dog is fixedly connected to the differential dog frame, a main shaft is connected with the feed dog frame and the differential dog frame through a dog lifting mechanism to drive the feed dog frame and the differential dog frame to reciprocate up and down in the vertical direction, the movement in the direction controls the height of the feed dog and the differential dog in the sewing machine, namely the height of the dog lifting is controlled, and the height of the dog lifting is also the distance from the upper surface of a needle plate when the feed dog and the differential dog move to the highest point in the up-down direction. The feeding action of the cloth can be realized by matching the feed dog with the feed dog frame to move and matching the differential dog with the differential dog frame to move.

In the prior art, when cloth is placed on the needle plate, the height of the presser foot needs to be adjusted manually, the distance between the presser foot and the needle plate is adjusted, and the feeding action of the cloth with different thicknesses is facilitated. In addition, because the cloth feeding teeth and the differential teeth are all protruded out of the surface of the needle plate, the cloth placed on the surface of the needle plate is easy to scratch, hook and the like, and the sewing quality of the sewn cloth is seriously influenced.

SUMMERY OF THE UTILITY MODEL

Therefore, the lower supply adjusting device of the sewing machine and the sewing machine are needed to solve the problems that the height of the presser foot needs to be adjusted manually in the material adding operation process of cloth with different thicknesses, the labor intensity is high, and the sewing efficiency and the sewing quality of the cloth are low in the conventional sewing machine.

A lower supply adjusting device of a sewing machine comprises a main shaft, a feed dog mechanism, a feed dog frame and a differential feed dog frame, wherein the feed dog frame is provided with feed dogs, the differential feed dog frame is provided with differential feed dogs, the main shaft is connected with the feed dog frame and the differential feed dog frame through the feed dog mechanism, and the lower supply adjusting device of the sewing machine further comprises:

the driving assembly comprises a driving element, a first cam and a second cam, wherein the first cam and the second cam are arranged on the driving element, the first cam is provided with a needle pitch adjusting contour surface and a first idle running surface, and the second cam is provided with a lower needle pitch adjusting contour surface and a second idle running surface;

the needle pitch transmission mechanism comprises a first roller and a needle pitch transmission assembly in transmission connection with the first roller, the first roller is in rolling contact with the first cam, and the needle pitch transmission assembly is connected with the main shaft;

the lower supply transmission mechanism comprises a second roller and a lower supply transmission assembly in transmission connection with the second roller, the second roller is in rolling contact with the second cam, and the lower supply transmission assembly is connected with the tooth lifting mechanism;

when the driving element is in a first rotating state, the first roller rolls on the needle gage adjusting contour surface, and the second roller rolls on the second idle running surface; when the driving element is in a second rotation state, the first roller rolls on the first idle running surface, and the second roller rolls on the lower supply adjustment contour surface.

Above-mentioned supply adjusting device under sewing machine, including drive assembly, gauge needle drive mechanism and supply drive mechanism down, when drive element is in first rotating state, drive first cam and second cam and be rotary motion, at this moment, first gyro wheel rolls on gauge needle adjustment profile face, the second gyro wheel rolls on second idle running face, the position of first gyro wheel changes, first gyro wheel makes gauge needle drive assembly drive main shaft and be swing motion, drive feed dog frame and differential dog frame through lifting tooth mechanism and move in the horizontal direction, with the gauge needle between regulation feed dog and the differential tooth. When the driving element is in a second rotating state, the first cam and the second cam are driven to rotate, at the moment, the first roller rolls on the first idle running surface, the second roller rolls on the lower supply adjusting profile surface, the position of the second roller is changed, the second roller drives the lower supply transmission assembly to drive the tooth lifting mechanism to swing, the tooth lifting mechanism drives the cloth feeding tooth frame and the differential tooth frame to incline towards the direction far away from the inner side of the needle plate, so that the cloth feeding tooth and the differential tooth are lowered to the position below the surface of the needle plate, the feeding operation of cloth with different thicknesses, particularly the feeding operation of thick cloth, is facilitated, in the feeding operation process, the bad phenomena of scratching, hooking and the like cannot be caused to the cloth newly placed on the needle plate, and the sewing quality and the sewing efficiency of the sewn cloth are obviously improved.

In one embodiment, the feed dog mechanism comprises a swing seat, a first swing rod, a second swing rod, a third swing rod and a feed dog shaft, one end of the first swing rod is hinged to the main shaft, the other end of the first swing rod is hinged to the swing seat, one end of the second swing rod is hinged to the swing seat, the other end of the second swing rod is hinged to one end of the third swing rod, the other end of the third swing rod is hinged to the feed dog shaft, and the feed dog shaft is connected to the feed dog frame and the differential feed dog frame.

In one embodiment, the feed dog mechanism further includes a first feed dog slider and a second feed dog slider, a first groove and a second groove are formed at both ends of the feed dog frame and the differential feed dog frame, the first feed dog slider is slidably disposed in the first groove and eccentrically connected to the spindle, and the second feed dog slider is slidably disposed in the second groove and eccentrically connected to the feed dog shaft.

In one embodiment, the lower supply transmission assembly comprises a first rocker arm and a fourth rocker arm, one end of the first rocker arm is hinged to the second roller, the other end of the first rocker arm is hinged to one end of the fourth rocker arm, and the other end of the fourth rocker arm is hinged to the swing seat.

In one embodiment, the needle pitch transmission assembly comprises a second rocker arm, a needle pitch adjusting rod and a needle pitch crank, one end of the second rocker arm is hinged to the first roller, the other end of the second rocker arm is hinged to one end of the needle pitch adjusting rod, the other end of the needle pitch adjusting rod is hinged to one end of the needle pitch crank, and the other end of the needle pitch crank is hinged to the cloth feeding tooth frame and the differential tooth frame.

In one embodiment, the needle gauge adjusting mechanism further comprises a shell, a first resetting piece and a second resetting piece, one end of the first resetting piece is fixed to the shell, the other end of the first resetting piece is fixed to the swinging seat, one end of the second resetting piece is fixed to the shell, and the other end of the second resetting piece is fixed to the needle gauge adjusting rod.

In one embodiment, the cloth feeding device further comprises a cloth feeding adjusting rod and a differential adjusting rod, wherein one end of the cloth feeding adjusting rod is hinged to the needle pitch crank, the other end of the cloth feeding adjusting rod is hinged to the cloth feeding tooth frame, one end of the differential adjusting rod is hinged to the needle pitch crank, and the other end of the differential adjusting rod is hinged to the differential tooth frame.

In one embodiment, a feed lifting rock shaft is fixed on the feed lifting rock shaft, and the other end of the third swing rod is hinged to the feed lifting rock shaft.

In one embodiment, the driving element has an output shaft, and the first cam and the second cam are both sleeved on the output shaft.

A sewing machine comprises the sewing machine lower supply adjusting device according to any one of the technical schemes.

According to the sewing machine, the feed dog frame and the differential dog frame are driven by the feed dog mechanism to face towards the direction inclined away from the inner side of the needle plate, so that the feed dogs and the differential dogs are lowered to the position below the surface of the needle plate, the feeding operation of cloth with different thicknesses, particularly the feeding operation of thick cloth, is convenient to perform on the needle plate, and in the feeding operation process, the bad phenomena of scratching, hooking and the like on the cloth newly placed on the needle plate can be avoided, so that the sewing quality and the sewing efficiency of the sewn cloth are remarkably improved.

Drawings

FIG. 1 is a schematic structural view of a lower supply adjusting device of a sewing machine according to the present invention;

FIG. 2 is a schematic view of another view angle of the lower supply adjustment device of the sewing machine according to the present invention;

FIG. 3 is a front view of the lower supply adjusting device of the sewing machine according to the present invention;

fig. 4 is a schematic structural diagram of a module formed by the first cam, the first roller, the second cam and the second roller.

Reference numerals:

100. a lower supply adjusting device of the sewing machine;

110. a main shaft;

120. a tooth lifting mechanism; 121. a swing seat; 122. a first swing link; 123. a second swing link; 124. a third swing link; 125. a feed lifting shaft; 126. a first tooth lifting slide block; 127. a second tooth lifting slide block; 128. a feed lifting crank; 129. a needle plate;

130. a feed dog frame; 131. a feed dog; 132. a first groove; 133. a cloth feeding adjusting rod;

140. a differential dental articulator; 141. differential teeth; 142. a second groove; 143. a differential adjusting rod;

150. a drive assembly; 151. a drive element; 1511. an output shaft; 152. a first cam; 1521. a stitch length adjusting contour surface; 1522. a first idle running surface; 153. a second cam; 1531. a lower supply adjusting contour surface; 1532. a second idle running surface;

160. a needle pitch drive mechanism; 161. a first roller; 162. a needle pitch drive assembly; 1621. a second rocker arm; 1622. a needle pitch adjusting rod; 1623. a needle pitch crank;

170. a lower supply transmission mechanism; 171. a second roller; 172. a lower supply transmission assembly; 1721. a first rocker arm; 1722. a fourth swing link;

180. a first reset member; 181. a second reset member.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical solution provided by the embodiments of the present invention is described below with reference to the accompanying drawings.

As shown in fig. 1, 2, 3 and 4, the present invention provides a sewing machine lower supply adjusting device 100, wherein the sewing machine lower supply adjusting device 100 includes a main shaft 110, a feed lifting mechanism 120, a feed dog holder 130 and a differential dog holder 140. The feed dog frame 130 is provided with feed dogs 131, the differential dog frame 140 is provided with differential dogs 141, the spindle 110 is connected with the feed dog frame 130 and the differential dog frame 140 through the feed lifting mechanism 120 to drive the feed dog frame 130 and the differential dog frame 140 to reciprocate up and down in the vertical direction, and the feed dogs 131 are matched with the feed dog frame 130 to move, and the differential dogs 141 are matched with the differential dog frame 140 to move, so that the feeding action of cloth can be realized. In addition, the sewing machine lower feed adjusting apparatus 100 further includes a driving assembly 150, a pitch driving mechanism 160, and a lower feed driving mechanism 170.

The driving assembly 150 includes a driving element 151, a first cam 152 and a second cam 153, and the first cam 152 and the second cam 153 are disposed on the driving element 151. The first cam 152 has a needle pitch adjusting contour surface 1521 and a first idle running surface 1522, in other words, the outer circumferential surface of the first cam 152 is composed of the needle pitch adjusting contour surface 1521 and the first idle running surface 1522; the second cam 153 has a lower supply adjustment contour surface 1531 and a second idle surface 1532, i.e., the outer circumferential surface of the second cam 153 is composed of the lower supply adjustment contour surface 1531 and the second idle surface 1532. In this embodiment, the driving element 151 is a motor, the driving element 151 has an output shaft 1511, the first cam 152 and the second cam 153 are both sleeved on the output shaft 1511, and when the driving element 151 outputs power to the output shaft 1511, the output shaft 1511 can drive the first cam 152 and the second cam 153 to rotate. Of course, in other embodiments, the driving element 151 is not limited to the motor provided above, and may also be a cylinder or other components capable of outputting power, and the invention is not limited to the specific type of the driving element 151.

The pitch drive mechanism 160 includes a first roller 161 and a pitch drive assembly 162, the first roller 161 is drivingly connected to the pitch drive assembly 162, the first roller 161 is in rolling contact with the first cam 152, and the pitch drive assembly 162 is connected to the main shaft 110. When the first roller 161 rolls on the first cam 152 and the position of the first roller 161 changes, the first roller 161 drives the pitch transmission assembly 162 to move, thereby controlling the movement of the main shaft 110.

The lower supply transmission mechanism 170 includes a second roller 171 and a lower supply transmission assembly 172, the second roller 171 is in transmission connection with the lower supply transmission assembly 172, the second roller 171 is in rolling contact with the second cam 153, and the lower supply transmission assembly 172 is connected with the feed lifting mechanism 120. When the second roller 171 rolls on the second cam 153 and the position of the second roller 171 changes, the second roller 171 can be driven by the transmission assembly 172 to move, so as to control the movement of the feed lifting mechanism 120.

When the driving element 151 is in the first rotating state, the first cam 152 and the second cam 153 are driven to rotate, at this time, the first roller 161 rolls on the needle pitch adjustment contour surface 1521, the second roller 171 rolls on the second idle surface 1532, the position of the first roller 161 is changed, the first roller 161 enables the needle pitch transmission assembly 162 to drive the spindle 110 to perform a swinging motion, and the feed dog frame 130 and the differential dog frame 140 are driven to move in the horizontal direction by the feed dog mechanism 120 to adjust the needle pitch between the feed dog 131 and the differential dog 141. When the driving element 151 is in the second rotation state, the first cam 152 and the second cam 153 are driven to rotate, at this time, the first roller 161 rolls on the first idle surface 1522, the second roller 171 rolls on the lower supply adjustment contour surface 1531, the position of the second roller 171 changes, the second roller 171 makes the lower supply transmission assembly 172 drive the tooth lifting mechanism 120 to perform a swinging motion, the feed dog frame 130 and the differential dog frame 140 are driven by the feed dog mechanism 120 to incline towards the direction far away from the inner side of the needle plate 129, so that the feed dog 131 and the differential dog 141 are lowered to the position below the surface of the needle plate 129, the feeding operation of the cloth with different thicknesses, particularly the feeding operation of the thick cloth, is convenient to carry out on the needle plate 129, in addition, in the process of material adding operation, the bad phenomena of scratching, hooking and the like on the cloth newly placed on the needle plate 129 can not be caused, and the sewing quality and the sewing efficiency of the sewn cloth can be obviously improved.

In order to realize the feeding action of the cloth, as shown in fig. 1, 2 and 3, a preferred embodiment of the feed lifting mechanism 120 includes a swing base 121, a first swing link 122, a second swing link 123, a third swing link 124 and a feed lifting shaft 125. One end of the first swing link 122 is hinged to the main shaft 110, the other end of the first swing link 122 is hinged to the swing seat 121, one end of the second swing link 123 is hinged to the swing seat 121, the other end of the second swing link 123 is hinged to one end of the third swing link 124, the other end of the third swing link 124 is hinged to the feed dog shaft 125, and the feed dog shaft 125 is connected to the feed dog frame 130 and the differential dog frame 140. When the main shaft 110 rotates, the motion is transmitted to the first swing link 122, the motion is transmitted to the feed lifting tooth shaft 125 through the first swing link 122, the second swing link 123 and the third swing link 124, so that the feed lifting tooth shaft 125 executes swinging motion, and the feed lifting tooth shaft 125 is connected with the feed lifting tooth frame 130 and the differential tooth frame 140, so that the feed lifting tooth frame 130 and the differential tooth frame 140 are driven to reciprocate up and down in the vertical direction, and the feed lifting tooth shaft can realize the feeding motion of cloth by matching the feed lifting tooth 131 with the feed lifting tooth frame 130 and matching the differential tooth 141 with the differential tooth frame 140.

Specifically, as shown in fig. 1, fig. 2 and fig. 3, the feed lifting mechanism 120 further includes a first feed lifting slide block 126 and a second feed lifting slide block 127, and both ends of the feed dog 130 and the differential dog 140 are respectively provided with a first groove 132 and a second groove 142. In other words, the feed dog 130 has a first end and a second end, the differential dog 140 also has a first end and a second end, after the feed dog 130 and the differential dog 140 are assembled, the first end of the feed dog 130 coincides with the first end of the differential dog 140, the second end of the feed dog 130 coincides with the second end of the differential dog 140, the first groove 132 is located at the end where the feed dog 130 coincides with the differential dog 140, and the second groove 142 is located at the other end where the feed dog 130 coincides with the differential dog 140.

The first tooth lifting slider 126 is slidably disposed in the first groove 132, and the first tooth lifting slider 126 is eccentrically connected to the main shaft 110. The second lift tooth slider 127 is slidably disposed in the second groove 142, and the second lift tooth slider 127 is eccentrically coupled to the lift tooth shaft 125. When the main shaft 110 and the feed lifting shaft 125 move, the first feed lifting slide block 126 and the second feed lifting slide block 127 can be driven to reciprocate up and down in the vertical direction, so that the distance between the feed dog 131 and the upper surface of the needle plate 129 and the distance between the differential dog 141 and the upper surface of the needle plate 129 are controlled, and the sewing operation of the cloth is completed.

In order to complete the feeding action of the sewing machine feeding adjustment device 100, in a preferred embodiment, as shown in fig. 1, 2, 3 and 4, the feeding transmission assembly 172 includes a first swing arm 1721 and a fourth swing arm 1722. One end of the first swing arm 1721 is hinged to the second roller 171, and the other end of the first swing arm 1721 is hinged to one end of the fourth swing link 1722, and the other end of the fourth swing link 1722 is hinged to the swing seat 121. When the second roller 171 rolls on the lower supply adjustment contour surface 1531, due to the change of the position of the second roller 171, the second roller 171 drives the first rocker arm 1721 to rotate, the swing base 121 and the first swing link 122 drive the main shaft 110 to change the position, and the swing base 121, the second swing link 123 and the third swing link 124 drive the feed dog shaft 125 to change the position, the main shaft 110 drives the first feed dog sliding block 126 to slide in the first groove 132, and the feed dog shaft 125 drives the second feed dog sliding block 127 to slide in the second groove 142, so that the feed dog carrier 130 and the differential dog carrier 140 incline in the direction away from the inner side of the needle plate 129, and the needle pitch gradually decreases until the feed dog 131 and the differential dog 141 descend below the surface of the needle plate 129. On the one hand, the adding operation of the cloth with different thicknesses, especially the adding operation of the thick cloth, is convenient to be carried out on the needle plate 129, and in the adding operation process, the bad phenomena of scratching, hooking and the like on the cloth newly placed on the needle plate 129 can not be caused, and the sewing quality and the sewing efficiency of the sewn cloth are obviously improved. On the other hand, in the lower supply process, the needle pitch can be reduced, so that the function of encrypting the needle pitch is favorably realized when the sewing operation of the cloth is started and finished, the bad phenomena of thread falling and the like of the sewn cloth are prevented, and the sewing quality of the cloth is further improved.

In order to accomplish the stitch length adjusting operation of the lower supply adjusting apparatus 100 of the sewing machine, in a preferred embodiment, as shown in fig. 1, 2, 3 and 4, the stitch length driving assembly 162 includes a second swing arm 1621, a stitch length adjusting lever 1622 and a stitch length crank 1623. One end of the second swing arm 1621 is hinged to the first roller 161, and the other end of the second swing arm 1621 is hinged to one end of the needle pitch adjustment lever 1622, the other end of the needle pitch adjustment lever 1622 is hinged to one end of the needle pitch crank 1623, and the other end of the needle pitch crank 1623 is hinged to the feed dog 130 and the differential dog 140. When the first roller 161 rolls on the needle pitch adjusting contour surface 1521, the first roller 161 drives the second rocker arm 1621 to rotate due to the change of the position of the first roller 161, so that the needle pitch crank 1623 changes the position through the needle pitch adjusting rod 1622, and the needle pitch crank 1623 is hinged to the feed dog frame 130 and the differential dog frame 140 to drive the change of the positions of the feed dog frame 130 and the differential dog frame 140 in the horizontal direction and adjust the needle pitch between the feed dog 131 and the differential dog 141, thereby meeting various different sewing requirements of cloth and improving the applicability of the adjusting device 100 under the sewing machine.

Specifically, as shown in fig. 1, 2, 3 and 4, the lower feed adjusting device 100 further includes a cloth feed adjusting lever 133 and a differential adjusting lever 143. One end of the cloth feeding adjusting rod 133 is hinged to the needle pitch crank 1623, and the other end of the cloth feeding adjusting rod 133 is hinged to the cloth feeding dental bracket 130, so that the needle pitch crank 1623 is indirectly hinged to the cloth feeding dental bracket 130; one end of the differential adjustment lever 143 is hinged to the gauge crank 1623, and the other end of the differential adjustment lever 143 is hinged to the differential carrier 140, so that the gauge crank 1623 is indirectly hinged to the differential carrier 140. When the position of the needle pitch crank 1623 changes, the needle pitch crank 1623 drives the cloth feeding adjusting rod 133 and the differential adjusting rod 143 to rotate, so as to drive the cloth feeding tooth rack 130 and the differential tooth rack 140 to change the position in the horizontal direction, and adjust the needle pitch between the cloth feeding tooth 131 and the differential tooth 141, thereby satisfying different sewing requirements of cloth and improving the applicability of the lower supply adjusting device 100 of the sewing machine.

In order to maintain the reliable contact between the first roller 161 and the first cam 152, and between the second roller 171 and the second cam 153, in a preferred embodiment, as shown in fig. 1, 2 and 3, the lower supply adjusting device 100 of the sewing machine further includes a housing (not shown), a first reset member 180 and a second reset member 181. One end of the first resetting member 180 is fixed on the housing, the other end of the first resetting member 180 is fixed on the swing seat 121, and an acting force applied to the swing seat 121 through the first resetting member 180 is transmitted to the second roller 171, so that the second roller 171 is reliably contacted with the second cam 153, and the second roller 171 can always be attached to the surface of the second cam 153 to roll. One end of the second reset element 181 is fixed to the housing, the other end of the second reset element 181 is fixed to the needle pitch adjusting lever 1622, and an acting force applied to the needle pitch adjusting lever 1622 by the second reset element 181 is transmitted to the first roller 161, so that reliable contact between the first roller 161 and the first cam 152 is ensured, and the first roller 161 can always be attached to the surface of the first cam 152 to roll.

In this embodiment, the first and second reset pieces 180 and 181 are both one of a tension spring and a torsion spring, one end of the first reset piece 180 is hooked on the housing, the other end of the first reset piece 180 is hooked on the swing seat 121, similarly, one end of the second reset piece 181 is hooked on the housing, and the other end of the second reset piece 181 is hooked on the needle pitch adjusting rod 1622, and during the movement of the first and second rollers 161 and 171, the first and second reset pieces 180 and 181 can always apply an acting force to the first and second rollers 161 and 171 to keep the first and second rollers 161 and 152 and the second and second rollers 171 and 153 in reliable contact. Of course, the first restoring member 180 and the second restoring member 181 may also be other structural members having elastic force, and the present invention is not limited to the specific types of the first restoring member 180 and the second restoring member 181.

In order to make the main shaft 110 drive the feed lifting rock shaft 125 to move, in a preferred embodiment, as shown in fig. 1 and 2, a feed lifting rock crank 128 is fixed on the feed lifting rock shaft 125, and the other end of the third swing link 124 is hinged to the feed lifting rock crank 128. When the main shaft 110 rotates, the motion is transmitted to the first swing link 122, the motion is transmitted to the feed lifting crank 128 through the first swing link 122, the second swing link 123 and the third swing link 124, the feed lifting shaft 125 performs swing motion through the feed lifting crank 128, the feed lifting shaft 125 is connected with the feed dog frame 130 and the differential dog frame 140, the feed dog frame 130 and the differential dog frame 140 are driven to reciprocate up and down in the vertical direction, the feed dog 131 is matched with the feed dog frame 130 to move, and the differential dog 141 is matched with the differential dog frame 140 to move, so that the feeding motion of cloth can be realized.

In addition, as shown in fig. 1, the utility model also provides a sewing machine, which comprises the sewing machine lower supply adjusting device 100 of any one of the above technical schemes.

In the sewing machine, the feed dog rack 130 and the differential dog rack 140 are driven by the feed dog mechanism 120 to incline towards the direction far away from the inner side of the needle plate 129, so that the feed dog 131 and the differential dog 141 are lowered below the surface of the needle plate 129, the feeding operation of the cloth with different thicknesses, particularly the feeding operation of the thick cloth, is convenient to perform on the needle plate 129, in addition, in the feeding operation process, the bad phenomena of scratching, hooking and the like on the cloth newly placed on the needle plate 129 can not be caused, and the sewing quality and the sewing efficiency of the sewn cloth are obviously improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A lower supply adjusting device of a sewing machine comprises a main shaft, a feed dog mechanism, a feed dog frame and a differential feed dog frame, wherein the feed dog frame is provided with feed dogs, the differential feed dog frame is provided with differential feed dogs, the main shaft is connected with the feed dog frame and the differential feed dog frame through the feed dog mechanism, and the lower supply adjusting device of the sewing machine is characterized by further comprising:

when the driving element is in a first rotating state, the first roller rolls on the gauge adjustment profile surface, and the second roller rolls on the second idle running surface; when the driving element is in a second rotation state, the first roller rolls on the first idle running surface, and the second roller rolls on the lower supply adjustment contour surface.

2. The sewing machine lower supply adjusting device according to claim 1, wherein the feed lifting mechanism comprises a swing seat, a first swing link, a second swing link, a third swing link and a feed lifting shaft, one end of the first swing link is hinged to the main shaft, the other end of the first swing link is hinged to the swing seat, one end of the second swing link is hinged to the swing seat, the other end of the second swing link is hinged to one end of the third swing link, the other end of the third swing link is hinged to the feed lifting shaft, and the feed lifting shaft is connected to the feed dog carrier and the differential dog carrier.

3. The sewing machine lower feed adjusting device according to claim 2, wherein the feed dog mechanism further comprises a first feed dog slider and a second feed dog slider, both ends of the feed dog frame and the differential dog frame are provided with a first groove and a second groove, the first feed dog slider is slidably disposed in the first groove and eccentrically connected to the main shaft, and the second feed dog slider is slidably disposed in the second groove and eccentrically connected to the feed dog shaft.

4. The sewing machine lower supply adjusting device according to claim 3, wherein the lower supply transmission assembly comprises a first rocker arm and a fourth rocker arm, one end of the first rocker arm is hinged to the second roller, the other end of the first rocker arm is hinged to one end of the fourth rocker arm, and the other end of the fourth rocker arm is hinged to the swing seat.

5. The lower feed adjusting device of the sewing machine according to claim 4, wherein the needle pitch transmission assembly comprises a second rocker arm, a needle pitch adjusting rod and a needle pitch crank, one end of the second rocker arm is hinged to the first roller, the other end of the second rocker arm is hinged to one end of the needle pitch adjusting rod, the other end of the needle pitch adjusting rod is hinged to one end of the needle pitch crank, and the other end of the needle pitch crank is hinged to the cloth feeding tooth frame and the differential tooth frame.

6. The sewing machine lower supply adjusting device according to claim 5, further comprising a housing, a first reset member and a second reset member, wherein one end of the first reset member is fixed to the housing, and the other end thereof is fixed to the swing seat, one end of the second reset member is fixed to the housing, and the other end thereof is fixed to the needle pitch adjusting lever.

7. The sewing machine lower feed adjusting device according to claim 5, further comprising a cloth feeding adjusting lever and a differential adjusting lever, wherein one end of the cloth feeding adjusting lever is hinged to the needle pitch crank, the other end of the cloth feeding adjusting lever is hinged to the cloth feeding tooth frame, one end of the differential adjusting lever is hinged to the needle pitch crank, and the other end of the differential adjusting lever is hinged to the differential tooth frame.

8. The sewing machine lower feed adjusting device according to claim 2, wherein a feed lifting crank is fixed on the feed lifting rock shaft, and the other end of the third swing link is hinged to the feed lifting crank.

9. The sewing machine lower feed adjusting device according to claim 1, wherein the driving element has an output shaft, and the first cam and the second cam are both sleeved on the output shaft.

10. A sewing machine comprising a sewing machine lower supply adjustment device according to any of claims 1-9.