Sewing machine and its feeding mechanism

Abstract

The present application relates to the sewing machine technical field, especially to a sewing machine feeding mechanism and a sewing machine comprising the feeding mechanism. The feeding mechanism comprises a lifting tooth assembly connected with the lifting tooth end of the tooth frame and driving the tooth frame to make up-and-down reciprocating motion, a feeding assembly connected with the feeding end of the tooth frame and driving the tooth frame to make forward-and-backward reciprocating motion, and a horizontal compensation assembly connected with the feeding end of the tooth frame and driving the tooth frame to make up-and-down reciprocating motion. When the lifting tooth assembly drives the lifting tooth end of the tooth frame to lift, the horizontal compensation assembly drives the feeding end of the tooth frame to lift synchronously, so that the feeding end and the lifting tooth end of the tooth frame lift synchronously and keep horizontal. Through the coordinated motion of the two sets of five-bar mechanisms of the lifting tooth assembly, the horizontal compensation assembly and the feeding assembly, the feeding tooth end points can always keep horizontal in the up, down, forward and backward four motion processes during the operation of the sewing machine, so as to realize the horizontal feeding motion track of the feeding tooth.

Description

Technical Field

[0001] This invention relates to the field of sewing machine technology, and more particularly to a feeding mechanism for a sewing machine and a sewing machine including the feeding mechanism. Background Technology

[0002] In existing technologies, such as Figure 1 As shown, the feeding mechanism of the sewing machine includes a feed dog shaft 1 and a feed shaft 2 driven by a drive source (a main shaft and cam linkage mechanism driven by a power source, or an independent power source). A feed dog fork 3, which rotates synchronously with the feed dog shaft 1, is mounted on the feed dog shaft 1. The feed dog fork 3 has a feed dog groove 31. A feed dog slider, which slides in cooperation with the feed dog groove 31, is hinged to one end (usually the rear end, referred to as the feed dog end in this text) of the feed dog holder 5 via a feed dog slider pin 4. A feed dog holder seat 6, which rotates synchronously with the feed shaft 2, is mounted on the feed shaft 2. The feed dog holder 6 is hinged to the other end (usually the front end, referred to as the feed end in this text) of the feed dog holder 5, thus forming a five-bar linkage mechanism with two shafts. The feed dog 7 is mounted on the feed dog holder 5, which is located below the needle plate 8. The lifting tooth shaft 1 rotates back and forth, driving the lifting tooth fork 3 to swing up and down, causing the tooth holder 5 and the feed tooth 7 to reciprocate up and down. The feed shaft 2 rotates back and forth, driving the tooth holder seat 6 to swing back and forth, causing the tooth holder 5 and the feed tooth 7 to reciprocate back and forth. The feed tooth 7, under the coordinated reciprocating motion of the lifting tooth shaft 1 and the feed shaft 2, performs a compound motion of up-and-down reciprocating motion and back-and-forth reciprocating motion, completing the fabric feeding action. The movement trajectory of the feed tooth 7 is roughly elliptical and is located on the upper and lower sides of the needle plate 8. When the feed tooth 7 is above the needle plate 8, the feed tooth 7 pushes the fabric; when the feed tooth 7 is below the needle plate 8, the feed tooth 7 retracts, and the cycle repeats to feed the fabric. This feeding mechanism is disclosed in utility model patent publication number CN216040125U.

[0003] The tip of the feed tooth 7 is called the feed tooth front point E1, and the rear point of the feed tooth 7 is called the feed tooth rear point E2. In the above feeding mechanism, since the lifting shaft 1 and the feeding shaft 2 are respectively connected to the lifting end and the feeding end of the feed frame 5, and respectively drive the feed frame 5 and the feed tooth 7 to perform up-and-down reciprocating motion and back-and-forth reciprocating motion, the up-and-down movement amplitude of the feed tooth rear point E2 is much greater than that of the feed tooth front point E1 during the combined motion of the feed tooth 7. As the sewing machine runs, the relative height position of the feed tooth front point E1 and the feed tooth rear point E2 changes continuously. During the operation of the sewing machine, if... Figure 1 As shown in Figure 1a, when the feed tooth 7 rises and begins to feed, the feed tooth front point E1 is slightly higher than the feed tooth rear point E2; Figure 1 As shown in Figure 1b, when the feed tooth 7 is in the highest feeding state, the feed tooth front point E1 is slightly lower than the feed tooth rear point E2; Figure 1As shown in Figure 1c, when the feed tooth 7 descends and enters the retraction state, the front point E1 of the feed tooth is much higher than the rear point E2 of the feed tooth. Therefore, in the feeding process of the existing feeding mechanism, the feed tooth 7 does not move horizontally; its height positions at both ends constantly change relative to each other and tilt, resulting in unstable feeding motion and inability to fully utilize feeding performance. Summary of the Invention

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to ensure that the feed dog remains parallel to the upper surface of the needle plate during its movement, thereby providing a feeding mechanism for a sewing machine capable of horizontal feeding by the feed dog. To solve the above-mentioned technical problem, the present invention adopts the following technical solution:

[0005] This invention provides a feeding mechanism for a sewing machine, including a lifting assembly connected to the lifting end of a sewing machine and driving the sewing machine to reciprocate up and down, and a feeding assembly connected to the feeding end of the sewing machine and driving the sewing machine to reciprocate back and forth. It also includes a horizontal compensation assembly connected to the feeding end of the sewing machine and driving the sewing machine to reciprocate up and down. When the lifting assembly drives the lifting end of the sewing machine to rise and fall, the horizontal compensation assembly drives the feeding end of the sewing machine to rise and fall synchronously, so that the feeding end and the lifting end of the sewing machine rise and fall synchronously and remain horizontal.

[0006] Preferably, the driving power of the horizontal compensation component comes from the tooth lifting shaft of the tooth lifting component, or from an independently configured power source.

[0007] Preferably, the horizontal compensation assembly includes a compensation drive crank and a compensation drive connecting rod. One end of the compensation drive crank is fixedly mounted on the tooth lifting shaft or the output shaft of the power source, and both ends of the compensation drive connecting rod are respectively hinged to the other end of the compensation drive crank and the feeding end of the tooth holder.

[0008] Preferably, the horizontal compensation assembly further includes a horizontal compensation crank and a horizontal compensation connecting rod. The horizontal compensation crank is fixed axially and rotatably mounted on the feeding shaft of the feeding assembly. The end of the compensation driving connecting rod away from the compensation driving crank is hinged to one end of the horizontal compensation crank. The two ends of the horizontal compensation connecting rod are respectively hinged to the other end of the horizontal compensation crank and the feeding end of the gear frame.

[0009] Preferably, the feeding assembly includes a tooth holder seat fixedly mounted on the feeding shaft and hinged to the feeding end of the tooth holder, a retaining ring provided between the tooth holder seat and the feeding shaft, and a horizontal compensation crank abutting against the retaining ring along the axial direction of the feeding shaft.

[0010] Preferably, the feeding assembly includes a tooth holder seat fixedly mounted on the feeding shaft and hinged to the feeding end of the tooth holder. The tooth holder seat has a main body fixedly sleeved on the feeding shaft and a connecting part extending radially from the outer peripheral surface of the main body. A feeding groove extending radially along the main body is provided on the connecting part. A feeding slider is provided in the feeding groove, which slides in cooperation with the feeding groove and is hinged to the feeding end of the tooth holder through a feeding pin.

[0011] Preferably, the main body has a long groove section that forms a clearance area with the feed shaft, the clearance area accommodating the horizontal compensation crank and providing space for the horizontal compensation crank to move.

[0012] Preferably, the end of the horizontal compensating link away from the horizontal compensating crank is rotatably sleeved on the feeding pin. The feeding pin has an axial through hole, and a radial oil hole is provided on the wall of the through hole. The end of the horizontal compensating link sleeved on the feeding pin has a radial through oil hole.

[0013] The present invention also provides a sewing machine, including the feeding mechanism of the sewing machine as described above.

[0014] Compared with the prior art, the present invention has significant progress:

[0015] The feeding mechanism of the sewing machine of the present invention compensates for the up-and-down reciprocating motion of the feeding end of the feed dog by setting a horizontal compensation component. When the lifting component drives the lifting end of the feed dog to rise and fall, the horizontal compensation component drives the feeding end of the feed dog to rise and fall synchronously, so that the feeding end and the lifting end of the feed dog rise and fall synchronously and remain in a horizontal state. Thus, through the coordinated movement of the two sets of five-bar linkages—the lifting component, the horizontal compensation component, and the feeding component—the front and rear ends of the feed dog can remain horizontal throughout the four movements of up, down, forward, and backward during the operation of the sewing machine, thereby realizing the horizontal feeding trajectory of the feed dog. Attached Figure Description

[0016] Figure 1 Figures 1a-1c are schematic diagrams of the feeding mechanism of a sewing machine in the prior art under different states. In figure 1a, the feed tooth rises and enters the feeding state; in figure 1b, the feed tooth reaches its highest point and enters the feeding state; and in figure 1c, the feed tooth descends and enters the retraction state.

[0017] Figure 2 This is a schematic diagram of the feeding mechanism of the sewing machine according to Embodiment 1 of the present invention.

[0018] Figure 3 yes Figure 2 A schematic diagram of the feeding mechanism from another perspective is shown.

[0019] Figure 4 yes Figure 2The diagram shows the connection structure between the compensation drive linkage and the feeding end of the toother in the feeding mechanism.

[0020] Figure 5 yes Figure 2 The diagram shows the feeding mechanism in different states, where 5a represents the feeding state with the feeding tooth at its highest point and 5b represents the feeding state with the feeding tooth in its retraction state.

[0021] Figure 6 This is a schematic diagram of the feeding mechanism of the sewing machine according to Embodiment 2 of the present invention.

[0022] Figure 7 yes Figure 6 A schematic diagram of the feeding mechanism from another perspective is shown.

[0023] Figure 8 yes Figure 6 The diagram shows the feeding mechanism in different states, where 8a represents the feeding state with the feeding tooth at its highest point and 8b represents the feeding state with the feeding tooth in its retraction state.

[0024] The reference numerals in the attached figures are explained as follows:

[0025] 1. Tooth lifting shaft

[0026] 2 Feeding shaft

[0027] 3. Lifting the tooth fork

[0028] 31 Tooth lifting groove

[0029] 4. Lifting tooth slider pin

[0030] 5 dental frame

[0031] 6 Dental bracket

[0032] 61 Main body

[0033] 611 Long Trough Section

[0034] 612 Fixed Section

[0035] 62 Connecting part

[0036] 63 Feed chute

[0037] 64 feed pin

[0038] 641 Through Hole

[0039] 65 Feed slider

[0040] 7 Feed dog

[0041] 8 needle plate

[0042] E1 feed dog front point

[0043] E2 Feeder back point

[0044] 9. Tooth-lifting slider

[0045] 10 Compensation drive crank

[0046] 11 Compensation drive linkage

[0047] 12 Horizontal Compensation Crank

[0048] 13 Horizontal Compensation Link

[0049] 131 Oil passage hole

[0050] 14 First Set Screw

[0051] 15 Connecting pins

[0052] 16-inch bezel

[0053] 17 Second Set Screw

[0054] 18 First linkage shaft

[0055] 19 Positioning sleeves

[0056] 20 Second linkage shaft

[0057] 21 Power Source

[0058] 22 Motor Shaft

[0059] 23 Connecting pin

[0060] 24 bearings Detailed Implementation

[0061] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0062] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0063] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0065] Example 1

[0066] like Figures 2 to 5 The image shows a first embodiment of the feeding mechanism for a sewing machine provided by the present invention.

[0067] The feeding mechanism of the sewing machine in this embodiment includes a lifting assembly connected to the lifting end of the feed dog 5 and driving the feed dog 5 to reciprocate up and down, and a feeding assembly connected to the feeding end of the feed dog 5 and driving the feed dog 5 to reciprocate back and forth. The feeding dog 7 is mounted on the feed dog 5, which is located below the needle plate 8. The lifting assembly includes a lifting shaft 1 that is driven to rotate and a lifting fork 3 fixedly mounted on the lifting shaft 1. The lifting fork 3 has a lifting groove 31, and a lifting slider 9 that slides in cooperation with the lifting groove 31 of the lifting fork 3 is hinged to the lifting end (rear end) of the feed dog 5 through a lifting slider pin 4. The reciprocating rotation of the lifting shaft 1 drives the lifting fork 3 to swing up and down, and causes the feed dog 5 and the feeding dog 7 to reciprocate up and down. The feeding assembly includes a feed shaft 2 driven to rotate and a feed dog seat 6 fixedly mounted on the feed shaft 2. The feed dog seat 6 is hinged to the feed end (front end) of the feed dog 5. The feed shaft 2 rotates back and forth, causing the feed dog seat 6 to swing back and forth, and causing the feed dog 5 and the feed dog 7 to reciprocate back and forth. The feed dog 7 performs a compound motion of up-and-down reciprocating motion and back-and-forth reciprocating motion under the coordinated reciprocating motion of the feed dog lifting shaft 1 and the feed shaft 2, thus completing the fabric feeding action. In this embodiment, the drive source for the feed dog lifting shaft 1 and the feed shaft 2 can be from the main shaft of the sewing machine or from an independent power source, which is prior art and will not be described in detail here.

[0068] To achieve horizontal movement of the feed dog 7, the feeding mechanism of the sewing machine in this embodiment is equipped with a horizontal compensation component. The horizontal compensation component is connected to the feeding end of the feed dog 5 and drives the feed dog 5 to reciprocate up and down. When the lifting component drives the lifting end of the feed dog 5 to rise and fall, the horizontal compensation component drives the feeding end of the feed dog 5 to rise and fall synchronously, so that the feeding end and the lifting end of the feed dog 5 rise and fall synchronously and remain horizontal. Thus, through the coordinated movement of the lifting component, the horizontal compensation component, and the feeding component, the two sets of five-bar linkages can be used to ensure that the front and rear ends of the feed dog 7 remain horizontal during the four movements of up, down, forward, and backward during the operation of the sewing machine, thereby realizing the horizontal feeding trajectory of the feed dog 7.

[0069] In this first embodiment, the driving power of the horizontal compensation component comes from the tooth lifting shaft 1 of the tooth lifting component. That is, when the tooth lifting shaft 1 drives the tooth lifting fork 3 to move the tooth lifting end of the tooth frame 5 up and down, it also drives the horizontal compensation component to move and drives the feeding end of the tooth frame 5 to rise and fall synchronously.

[0070] See Figure 2 and Figure 3 In this first embodiment, preferably, the horizontal compensation component includes a compensation drive crank 10 and a compensation drive connecting rod 11. One end of the compensation drive crank 10 is fixedly mounted on the tooth lifting shaft 1, and both ends of the compensation drive connecting rod 11 are hinged to the other end of the compensation drive crank 10 and the feeding end of the tooth holder 5, respectively. When the tooth lifting shaft 1 rotates, it drives the compensation drive crank 10 to swing, which in turn drives the compensation drive connecting rod 11 to move and raise or lower the feeding end of the tooth holder 5. The installation angle of the compensation drive crank 10 and the tooth lifting fork 3 on the tooth lifting shaft 1 is such that when the tooth lifting shaft 1 drives the tooth lifting fork 3 to raise or lower the tooth lifting end of the tooth holder 5, the compensation drive crank 10 moves with the tooth lifting shaft 1 and, through the compensation drive connecting rod 11, drives the feeding end of the tooth holder 5 to rise or fall synchronously.

[0071] In this embodiment, the compensation drive crank 10 is fixedly mounted on the tooth-lifting shaft 1 by a first set screw 14. The compensation drive connecting rod 11 is hinged to the compensation drive crank 10 by a connecting pin 15, which is horizontal to the tooth-lifting shaft 1. The compensation drive crank 10 has two sleeve holes, one of which is fitted onto the tooth-lifting shaft 1, and the other is fitted onto the connecting pin 15. The compensation drive crank 10 has a through-hole between the two sleeve holes, and the two sides of the through-hole have opposing threaded holes. The first set screw 14 connects to the threaded holes on the two sides of the through-hole. By tightening the first set screw 14, the through-hole of the compensation drive crank 10 can be tightened, so that the compensation drive crank 10 simultaneously grips the tooth-lifting shaft 1 and the connecting pin 15. The threaded holes on the two sides of the through-hole of the compensation drive crank 10 are preferably positioned so that a suitable locking torque can be applied to the tooth-lifting shaft 1 and the connecting pin 15 simultaneously. The compensation drive link 11 is rotatably connected to the connecting pin 15.

[0072] Combination Figure 4 Preferably, the horizontal compensation assembly further includes a horizontal compensation crank 12 and a horizontal compensation connecting rod 13. The horizontal compensation crank 12 is fixed axially and rotatably mounted on the feed shaft 2 of the feeding assembly, so that the rotation of the feed shaft 2 and the rotation of the horizontal compensation crank 12 do not interfere with each other. The horizontal compensation crank 12 and the feed shaft 2 are fitted with a clearance to allow relative rotation. The end of the compensation drive connecting rod 11 away from the compensation drive crank 10 is hinged to one end of the horizontal compensation crank 12, and the two ends of the horizontal compensation connecting rod 13 are respectively hinged to the other end of the horizontal compensation crank 12 and the feed end of the toothed frame 5. When the lifting shaft 1 rotates, it drives the lifting fork 3 to swing up and down, thereby raising and lowering the lifting end of the tooth frame 5. At the same time, the compensation drive crank 10 swings back and forth under the rotation of the lifting shaft 1, which drives the compensation drive connecting rod 11 to move back and forth. The compensation drive connecting rod 11 drives the horizontal compensation crank 12 to swing back and forth, and the swing direction of the horizontal compensation crank 12 is the same as the swing direction of the compensation drive crank 10. The back and forth swing of the compensation drive crank 10 pulls the horizontal compensation connecting rod 13, which pushes the feeding end of the tooth frame 5 to rise and fall. The up and down movement direction of the feeding end of the tooth frame 5 is the same as the up and down movement direction of the lifting end of the tooth frame 5, thereby realizing the horizontal raising and lowering of the lifting end and the feeding end of the tooth frame 5, that is, realizing the horizontal raising and lowering of the front and rear ends of the feeding tooth 7.

[0073] In this first embodiment, the feed assembly's tooth holder 6 is sleeved on the feed shaft 2. Preferably, a retaining ring 16 is provided between the tooth holder 6 and the feed shaft 2. The horizontal compensating crank 12 abuts against the retaining ring 16 along the axial direction of the feed shaft 2, thereby axially positioning the horizontal compensating crank 12. Using the retaining ring 16 to contact the horizontal compensating crank 12 facilitates a higher surface finish and makes it easier to machine a smooth surface compared to the tooth holder 6, thereby reducing wear and increasing service life.

[0074] In this embodiment, the dental arch support 6 has a main body 61 fixedly sleeved on the feed shaft 2 and a connecting part 62 extending radially from the outer circumferential surface of the main body 61. The connecting part 62 has a feed groove 63 extending radially along the main body 61. A feed slider 65 is provided within the feed groove 63, slidingly engaging with it and hinged to the feed end of the dental arch 5 via a feed pin 64. During assembly, the main body 61 of the dental arch support 6 is sleeved on the feed shaft 2 and secured by a tightened second set screw 17. The connecting part 62 is positioned above the feed shaft 2, causing the feed groove 63 to extend vertically, allowing the feed slider 65 to slide vertically within it. When the horizontal compensation linkage 13 of the horizontal compensation assembly pushes the feed end of the dental arch 5 up and down, the feed slider 65 slides vertically within the feed groove 63. When the feed shaft 2 rotates, it causes the connecting part 62 of the dental arch support 6 to swing back and forth, thereby pushing the dental arch 5 to move back and forth.

[0075] In this first embodiment, the main body 61 of the tooth frame seat 6 has a long groove section 611 that forms a clearance area with the feed shaft 2. The clearance area accommodates the horizontal compensation crank 12 and provides movement space for the horizontal compensation crank 12. Thus, by accommodating the horizontal compensation crank 12 inside the tooth frame seat 6, the structure can be made more compact. At the same time, by providing a long groove in the main body 61 of the tooth frame seat 6, both movement space for the horizontal compensation crank 12 and the strength of the tooth frame seat 6 can be guaranteed.

[0076] Preferably, the long groove section 611 is located in the middle of the main body 61 of the dental arch support 6. The main body 61 of the dental arch support 6 also includes fixed sections 612 located at both ends of the long groove section 611. A retaining ring 16 is provided between each of the two fixed sections 612 and the feeding shaft 2. The two fixed sections 612 are locked by a second set screw 17 to hold the corresponding retaining ring 16 tightly on the feeding shaft 2. Preferably, the bottom of the retaining ring 16 is grooved and is held and tightened by the fixed section 612 when the second set screw 17 is tightened. A horizontal compensation crank 12 is provided between the two fixed sections 612. A connecting part 62 is formed radially on the outer peripheral surface of each of the two fixed sections 612. The feeding sliders 65 in the feeding grooves 63 on the two connecting parts 62 are respectively hinged to both ends of the feeding pin 64. The feeding end of the dental arch 5 is sleeved on the feeding pin 64 and located between the two connecting parts 62. The horizontal compensating link 13 is also located between the two connecting parts 62.

[0077] Preferably, two horizontal compensating cranks 12 and two horizontal compensating connecting rods 13 are provided. The two horizontal compensating cranks 12 are horizontally spaced between the two fixed sections 612 of the main body 61 of the gear carrier seat 6, and respectively abut against the two retaining rings 16 along the axial direction of the feed shaft 2. The lower ends of the two horizontal compensating cranks 12 are respectively hinged to the two ends of the first linkage shaft 18, which is horizontal with the feed shaft 2 and located below the feed shaft 2. The end of the compensating drive connecting rod 11 away from the compensating drive crank 10 is rotatably sleeved on the first linkage shaft 18 and located between the lower ends of the two horizontal compensating cranks 12. A positioning sleeve 19 is provided between the end of the compensating drive connecting rod 11 sleeved on the first linkage shaft 18 and the lower end of at least one horizontal compensating crank 12 to achieve axial positioning of the two horizontal compensating cranks 12 and the compensating drive connecting rod 11 on the first linkage shaft 18. The upper ends of the two horizontal compensating cranks 12 are respectively hinged to the two ends of the second linkage shaft 20, which is horizontal with and above the feeding shaft 2. The lower ends of the two horizontal compensating connecting rods 13 are respectively connected to the two ends of the second linkage shaft 20. The horizontal compensating connecting rods 13 and the second linkage shaft 20 can be connected by hinge or by screw fixing. The upper ends of the two horizontal compensating connecting rods 13 are respectively hinged to the two ends of the feeding pin 64 and located between the feeding end of the toothed bracket 5 and the two feeding sliders 65. The locking structure (such as a snap ring) at both ends of the feeding pin 64 can realize the axial positioning of the two feeding sliders 65, the two horizontal compensating connecting rods 13 and the feeding end of the toothed bracket 5 on the feeding pin 64.

[0078] In this first embodiment, preferably, the end of the horizontal compensating connecting rod 13 away from the horizontal compensating crank 12 is rotatably sleeved on the feed pin 64. The feed pin 64 has an axially extending through hole 641 inside, and radial oil holes are formed on the wall of the through hole 641. At least two radial oil holes can be provided. The end of the horizontal compensating connecting rod 13 sleeved on the feed pin 64 has a radially extending oil hole 131. This provides a path for lubricating oil, facilitating lubrication.

[0079] See Figure 5 In this embodiment, the feeding mechanism of the sewing machine keeps the feed tooth 7 horizontal under different states, and the height positions of the feed tooth front point E1 and the feed tooth rear point E2 are kept at the same height.

[0080] Example 2

[0081] like Figures 6 to 8 The image shows a second embodiment of the feeding mechanism for a sewing machine provided by the present invention. Embodiment two is basically the same as embodiment one, and the similarities will not be repeated. The difference lies in that, in this embodiment two, see... Figure 6 and Figure 7The horizontal compensation component is driven by an independently configured power source 21. That is, the horizontal compensation component is independently driven by a separate power source 21. When the lifting shaft 1 of the lifting component drives the lifting fork 3 to move the lifting end of the tooth holder 5 up and down, the power source 21 drives the horizontal compensation component to move and synchronously raises and lowers the feeding end of the tooth holder 5. Therefore, through the separate control of the lifting shaft 1 and the power source 21, in addition to achieving synchronous movement between the horizontal compensation component and the lifting component, asynchronous movement can also be achieved, resulting in superior feeding capabilities that far surpass existing sewing machines.

[0082] In this second embodiment, one end of the compensation drive crank 10 of the horizontal compensation component is fixedly mounted on the output shaft of the power source 21, and the two ends of the compensation drive connecting rod 11 are respectively hinged to the other end of the compensation drive crank 10 and the feeding end of the tooth frame 5.

[0083] Preferably, the power source 21 is an electric motor, with the motor shaft 22 horizontal to the feeding shaft 2, and the motor shaft 22 outputting rotational power. One end of the compensating drive crank 10 is fixedly mounted on the motor shaft 22, and the other end of the compensating drive crank 10 is provided with a connecting rod pin 23 horizontal to the motor shaft 22. One end of the compensating drive connecting rod 11 is rotatably mounted on the connecting rod pin 23 via a bearing 24, and the other end of the compensating drive connecting rod 11 is hinged to the feeding end of the toothed frame 5. The connection structure between the other end of the compensating drive connecting rod 11 and the feeding end of the toothed frame 5 is the same as in Embodiment 1.

[0084] See Figure 8 In this second embodiment of the sewing machine, the feeding mechanism of the feeding tooth 7 always remains horizontal under different states, and the height positions of the feeding tooth front point E1 and the feeding tooth rear point E2 remain at the same height.

[0085] Based on the feeding mechanism of the sewing machine of the present invention, embodiments of the present invention also provide a sewing machine. The sewing machine of the present invention includes the feeding mechanism of any one of the sewing machines described in Embodiment 1 or Embodiment 2 above.

[0086] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A feeding mechanism for a sewing machine, comprising a lifting assembly connected to the lifting end of a toothed threader (5) and driving the toothed threader (5) to reciprocate up and down, and a feeding assembly connected to the feeding end of the toothed threader (5) and driving the toothed threader (5) to reciprocate back and forth, characterized in that, It also includes a horizontal compensation component, which is connected to the feeding end of the dental frame (5) and drives the dental frame (5) to move up and down reciprocally. When the tooth lifting component drives the tooth lifting end of the dental frame (5) to rise and fall, the horizontal compensation component drives the feeding end of the dental frame (5) to rise and fall synchronously, so that the feeding end and the tooth lifting end of the dental frame (5) rise and fall synchronously and remain horizontal. The driving force of the horizontal compensation component comes from the tooth lifting shaft (1) of the tooth lifting component, or from an independently configured power source (21). The horizontal compensation component includes a compensation drive crank (10) and a compensation drive connecting rod (11). One end of the compensation drive crank (10) is fixedly installed on the tooth lifting shaft (1) or on the output shaft of the power source (21). The two ends of the compensation drive connecting rod (11) are respectively hinged to the other end of the compensation drive crank (10) and the feeding end of the tooth frame (5). The horizontal compensation assembly further includes a horizontal compensation crank (12) and a horizontal compensation connecting rod (13). The horizontal compensation crank (12) is fixed axially and rotatably mounted on the feeding shaft (2) of the feeding assembly. The end of the compensation driving connecting rod (11) away from the compensation driving crank (10) is hinged to one end of the horizontal compensation crank (12). The two ends of the horizontal compensation connecting rod (13) are respectively hinged to the other end of the horizontal compensation crank (12) and the feeding end of the tooth frame (5). The feeding assembly includes a tooth holder seat (6) fixedly mounted on the feeding shaft (2) and hinged to the feeding end of the tooth holder (5). The tooth holder seat (6) has a main body (61) fixedly sleeved on the feeding shaft (2) and a connecting part (62) extending radially from the outer peripheral surface of the main body (61). A feeding groove (63) extending radially along the main body (61) is provided on the connecting part (62). A feeding slider (65) is provided in the feeding groove (63) and slides with the feeding groove (63) and is hinged to the feeding end of the tooth holder (5) through a feeding pin (64). The end of the horizontal compensation link (13) away from the horizontal compensation crank (12) is rotatably mounted on the feed pin (64).

2. The feeding mechanism of the sewing machine according to claim 1, characterized in that, A retaining ring (16) is provided between the tooth holder (6) and the feed shaft (2), and the horizontal compensation crank (12) abuts against the retaining ring (16) along the axial direction of the feed shaft (2).

3. The feed mechanism of a sewing machine according to claim 1, wherein The main body (61) has a long groove section (611) that forms an interval clearance area with the feed shaft (2), the interval clearance area accommodating the horizontal compensation crank (12) and providing the horizontal compensation crank (12) with a space for movement.

4. The feed mechanism of a sewing machine according to claim 1, wherein The feed pin (64) has an axial through hole (641) inside, and a radial oil hole is provided on the hole wall of the through hole (641). The horizontal compensation connecting rod (13) is sleeved on the feed pin (64) and has a radial through oil hole (131) at one end.

5. A sewing machine characterized by comprising: Includes the feeding mechanism of a sewing machine as described in any one of claims 1 to 4.

Images