Manual feed lifting adjusting structure of sewing machine head

Abstract

The utility model provides a manual feed lifting adjusting structure of a sewing machine head, and belongs to the technical field of sewing machines. The problem that the installation positions of an existing manual feed lifting adjusting structure and a differential adjusting assembly affect each other is solved. According to the manual feed lifting adjusting structure of the sewing machine head, a sewing machine comprises a machine shell and a feed dog frame arranged on the machine shell, a differential adjusting assembly is connected to the outer side of the feed dog frame, the manual feed lifting adjusting structure comprises a rotating shaft rotationally connected to the machine shell, a crank is vertically fixed to one end of the rotating shaft, and an ejector rod is hinged to the upper end of the crank; a transmission pin is eccentrically arranged on the end face of the other end of the rotating shaft, an inserting groove is formed in the end, close to the rotating shaft, of the feed dog frame, the transmission pin is embedded into the inserting groove and connected with the feed dog frame in a front-back sliding mode, the ejector rod is vertically arranged, and the upper end of the ejector rod penetrates out of the upper end of the machine shell. According to the manual feed lifting adjusting structure of the sewing machine head, the differential adjusting assembly and the manual feed lifting adjusting structure are convenient to install and stable in adjustment.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines, and relates to a manual tooth-lifting adjusting structure for a sewing machine head. Background Technique

[0002] Overlock sewing machines are mainly used for hemming and sewing textiles and are widely used in the sewing field. During the feeding process of an overlock sewing machine, the feeding dog cooperates with the presser foot to press the fabric tightly, and the feeding dog frame makes a reciprocating elliptical motion to achieve this. The overlock sewing machine continuously lifts and pulls the fabric on the needle plate through the feeding dog frame, and continuously transports the fabric to be processed to the head of the machine. This is the entire feeding process of the overlock sewing machine.

[0003] When processing relatively thick fabrics, insufficient dragging force of the feeding dog frame may cause fabric layering or overly dense stitch patterns. When processing relatively thin fabrics, excessive feeding may cause stitch wrinkles.

[0004] In response to the above problems, people have developed an adjusting mechanism for a feeding dog frame, such as disclosed in Chinese Patent Application [Authorization Publication No.: CN209722458U], which is used to adjust the feeding dog frame in an overlock sewing machine. The adjusting mechanism includes an adjusting component and a reduction motor that inputs a rotational motion to the adjusting component. The adjusting component includes an eccentric shaft and an adjusting slider disposed on the eccentric section of the eccentric shaft. The adjusting slider is slidably connected to the feeding dog frame. The concentric section of the eccentric shaft is connected to the output end of the reduction motor so that the eccentric shaft rotates with the reduction motor, and drives the adjusting slider on the eccentric section to slide in the sliding groove of the feeding dog frame and bias the feeding dog frame. The adjusting mechanism further includes a calibration component. The calibration component includes a limiting stop plate disposed on and rotating with the concentric section, and a mounting plate installed at a fixed position of the overlock sewing machine. One of the limiting stop plate and the mounting plate is provided with a magnet, and the other is provided with a Hall element. When the magnet and the Hall element face each other, the feeding dog frame is in the initial position. A differential amount adjusting mechanism is also provided in the overlock sewing machine. One end of the differential connecting piece of the differential amount adjusting mechanism is vertically disposed and is rotatably connected to the cover plate in the second transmission component.

[0005] The differential connecting piece of the differential amount adjusting mechanism with the above structure is connected to the feed dog support, and other components of the differential amount adjusting mechanism are arranged below the feed dog support without blocking one side of the feed dog support, reserving the space on one side of the feed dog support for the adjusting component. For some overlock sewing machines, the installation space under the machine shell is limited, and a differential amount adjusting mechanism needs to be arranged on one side of the feed dog support, resulting in the space on one side of the feed dog support being required to install both the adjusting component and the differential amount adjusting mechanism, which easily causes positional interference between the adjusting component and the differential amount adjusting mechanism, affecting the adjustment and installation of the adjusting machine component and the differential amount adjusting mechanism. Summary of the Invention

[0006] The purpose of the present invention is to address the above problems existing in the prior art and propose a manual lifting tooth adjusting structure for a sewing machine head. The technical problem to be solved by the present invention is: how to solve the problem that the installation positions of the existing manual lifting tooth adjusting structure and the differential adjusting component affect each other.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A manual lifting tooth adjusting structure for a sewing machine head, the sewing machine includes a machine shell and a feed dog support arranged on the machine shell. A differential adjusting component is connected to the outside of the feed dog support. It is characterized in that the manual lifting tooth adjusting structure includes a rotating shaft rotatably connected to the machine shell. One end of the rotating shaft is vertically fixed with a crank. The upper end of the crank is hinged with a push rod. A transmission pin is arranged eccentrically on the end face of the other end of the rotating shaft. A plugging groove is opened at one end of the feed dog support close to the rotating shaft. The transmission pin is embedded in the plugging groove and is slidably connected with the feed dog support back and forth. The push rod is arranged vertically and the upper end of the push rod passes through the upper end of the machine shell. The push rod can move up and down and drive the rotating shaft to rotate through the crank.

[0009] Working principle: The differential adjustment component is arranged on the outside of the feed tooth frame. The rotating shaft is arranged on the inside of the feed tooth frame, and a crank is vertically connected to the rotating shaft. A push rod is hinged on the upper end of the crank. The upper end of the push rod is located outside the casing. The rotating shaft is rotatably connected to the casing. When adjusting the height of the feed tooth frame, the push rod can be directly pushed up and down manually. The push rod drives the rotating shaft to rotate through the crank. The transmission pin is eccentrically arranged relative to the rotating shaft. The rotation of the rotating shaft drives the transmission pin to swing. A plug-in slot is provided on the feed tooth frame. The transmission pin is embedded in the plug-in slot and is connected with the housing. The feed tooth frame is connected by sliding forward and backward so that the swing of the transmission pin only drives the feed tooth frame to swing up and down, thereby realizing the adjustment of the feed tooth frame, and by arranging the manual tooth lifting adjustment structure on the inner side of the feed tooth frame and arranging the push rod vertically, with the upper end of the push rod located outside the casing, there is enough space for the arrangement and adjustment of the differential adjustment assembly or other components outside the feed tooth frame, avoiding the mutual influence between the differential adjustment assembly and the manual tooth lifting adjustment structure, making the differential adjustment assembly and the manual tooth lifting adjustment structure easy to install and stable to adjust.

[0010] In the above-mentioned manual tooth lifting adjustment structure of the sewing machine head, a guide sleeve is provided on the upper end of the casing, a pressing sleeve is sleeved on the upper end of the push rod, the upper end of the push rod is abutted against the pressing sleeve, and the pressing sleeve is threadedly connected to the guide sleeve and moves up and down.

[0011] When in use, the pressing sleeve can be rotated so that the pressing sleeve moves downward along the guide sleeve, making the user's adjustment easier and more convenient, and the guide sleeve can limit the push rod when it moves up and down, further improving the stability of the push rod movement.

[0012] In the above-mentioned manual tooth lifting adjustment structure of the sewing machine head, the housing includes a feed tooth arranged at one end of the feed tooth frame, the differential adjustment assembly includes a connecting rod connected to the middle part of the feed tooth frame, and the transmission pin is connected to the other end of the feed tooth frame.

[0013] By connecting the transmission pin to the other end of the feed tooth frame, the connecting rod of the differential adjustment assembly is connected to the middle of the feed tooth frame, so that the transmission pin and the connecting rod do not affect each other, making the distribution more reasonable.

[0014] In the above-mentioned manual tooth lifting adjustment structure of the sewing machine head, the end of the transmission pin has a transmission block, the transmission block is in a square block shape, and the upper and lower groove walls of the plug-in groove are in contact with the transmission block.

[0015] The setting of the transmission block increases the connection stability between the transmission pin and the feed tooth frame and improves the force-bearing area after the transmission pin rotates eccentrically. The transmission block can eccentrically rotate with the transmission pin and stably push up or press down one end of the feed tooth frame through the square block structure, thereby improving the stability of adjustment.

[0016] In the above-mentioned manual lifting tooth adjusting structure of the sewing machine head, a limiting plate is connected to the transmission block and abuts against one side of the feed dog support. A limiting sleeve is sleeved on the rotating shaft. The limiting sleeve is rotatably connected to the machine housing and is fixedly connected to the rotating shaft through a fastening member. One end of the limiting sleeve abuts against the other side of the feed dog support, and the other end abuts against the side of the crank.

[0017] The arrangements of the limiting plate and the limiting sleeve achieve the axial limitation of the rotating shaft and improve the stability of the rotational connection of the rotating shaft.

[0018] In the above-mentioned manual lifting tooth adjusting structure of the sewing machine head, a reset tension spring arranged vertically is connected inside the machine housing, and one end of the reset tension spring is connected to the middle of the ejector rod.

[0019] The arrangement of the reset tension spring enables the ejector rod to quickly return to the initial position and improves the practical stability of the manual lifting tooth adjusting structure.

[0020] Compared with the prior art, the manual lifting tooth adjusting structure of the present sewing machine head has the following advantages: By arranging the manual lifting tooth adjusting structure inside the feed dog support and arranging the ejector rod vertically with its upper end outside the machine housing, there is sufficient space for the setting and adjustment of the differential adjusting assembly or other components on the outside of the feed dog support, avoiding the mutual influence between the differential adjusting assembly and the manual lifting tooth adjusting structure, and improving the installation and adjustment stability of the differential adjusting assembly and the manual lifting tooth adjusting structure. Brief Description of the Drawings

[0021] Figure 1 is the schematic structural diagram after the assembly of the present utility model.

[0022] Figure 2 is the partial structural diagram of the present utility model.

[0023] Figure 3 is the partial exploded view of the present utility model.

[0024] In the figure, 1. Machine housing; 11. Guide sleeve; 12. Feed dog; 2. Feed dog support; 21. Insertion slot; 3. Differential adjusting assembly; 31. Connecting rod; 4. Rotating shaft; 41. Transmission pin; 42. Limiting plate; 43. Limiting sleeve; 44. Transmission block; 5. Crank; 6. Ejector rod; 61. Pressing sleeve; 7. Reset tension spring. Detailed Description of the Preferred Embodiments

[0025] The following are specific embodiments of the present utility model in combination with the drawings to further describe the technical solutions of the present utility model, but the present utility model is not limited to these embodiments.

[0026] Such as Figure 1As shown in the figure, the manual tooth-lifting adjustment structure of the sewing machine head. The sewing machine includes a machine shell 1 and a feed dog support 2 provided on the machine shell 1. A differential adjustment assembly 3 is connected to the outside of the feed dog support 2.

[0027] Specifically, as Figures 1 - 3 shown, this manual tooth-lifting adjustment structure includes a rotating shaft 4 rotatably connected to the machine shell 1. One end of the rotating shaft 4 is vertically fixed with a crank 5. The upper end of the crank 5 is hinged with a push rod 6. On the end face of the other end of the rotating shaft 4, there is a transmission pin 41 arranged eccentrically. The end of the transmission pin 41 has a transmission block 44. One end of the feed dog support 2 close to the rotating shaft 4 is provided with a plug-in slot 21. The transmission block 44 of the transmission pin 41 is embedded in the plug-in slot 21 and is slidably connected to the feed dog support 2 in the front and back directions. The push rod 6 is arranged vertically and the upper end of the push rod 6 passes through the upper end of the machine shell 1. The push rod 6 can move up and down and drive the rotating shaft 4 to rotate through the crank 5, causing the transmission pin 41 to rotate eccentrically.

[0028] Working principle: The differential adjustment assembly 3 is arranged on the outside of the feed dog support 2. By arranging the rotating shaft 4 on the inside of the feed dog support 2, a crank 5 is vertically connected to the rotating shaft 4. The upper end of the crank 5 is hinged with a push rod 6. The upper end of the push rod 6 is located outside the machine shell 1. The rotating shaft 4 is rotatably connected to the machine shell 1. When adjusting the height of the feed dog support 2, the push rod 6 can be directly manually pushed up and down. The push rod 6 drives the rotating shaft 4 to rotate through the crank 5. The transmission pin 41 is arranged eccentrically relative to the rotating shaft 4. The rotation of the rotating shaft 4 drives the transmission pin 41 to swing. The feed dog support 2 is provided with a plug-in slot 21. The transmission block 44 of the transmission pin 41 is embedded in the plug-in slot 21 and is slidably connected to the feed dog support 2 in the front and back directions, so that the swing of the transmission pin 41 only drives the feed dog support 2 to swing up and down, thus realizing the adjustment of the feed dog support 2. And by arranging the manual tooth-lifting adjustment structure on the inside of the feed dog support 2 and arranging the push rod 6 vertically with its upper end located outside the machine shell 1, there is enough space for the setting and adjustment of the differential adjustment assembly 3 or other components on the outside of the feed dog support 2, avoiding the mutual influence between the differential adjustment assembly 3 and the manual tooth-lifting adjustment structure, making the installation of the differential adjustment assembly 3 and the manual tooth-lifting adjustment structure convenient and the adjustment stable.

[0029] As Figure 2 shown, a guide sleeve 11 is connected to the upper end of the machine shell 1. The upper end of the push rod 6 is sleeved with a pressing sleeve 61. The upper end of the push rod 6 is in abutting connection with the pressing sleeve 61. The pressing sleeve 61 is threadedly connected to the guide sleeve 11 and moves up and down. The machine shell 1 includes a feed dog 12 provided at one end of the feed dog support 2. The differential adjustment assembly 3 includes a connecting rod 31 connected to the middle of the feed dog support 2. The transmission pin 41 is connected to the other end of the feed dog support 2.

[0030] As Figure 3As shown, the transmission block 44 is in the shape of a square block. The upper and lower groove walls of the insertion slot 21 are in contact with the transmission block 44. The transmission pin 41 is in the shape of a long strip cylinder, and the length direction of the transmission pin 41 is arranged along the axial direction of the rotating shaft 4.

[0031] As Figure 1 and Figure 3 As shown, a limiting plate 42 that abuts against the outer side of the feed dog support 2 is connected to the transmission block 44. A limiting sleeve 43 is sleeved on the rotating shaft 4. The limiting sleeve 43 is rotatably connected to the machine housing 1. The limiting sleeve 43 is fixedly connected to the rotating shaft 4 through a fastener. One end of the limiting sleeve 43 abuts against the inner side of the feed dog support 2, and the other end abuts against the side of the crank 5. A reset tension spring 7 arranged vertically is connected inside the machine housing 1. One end of the reset tension spring 7 is connected to the middle of the ejector rod 6.

[0032] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A manual tooth lifting adjustment structure for a sewing machine head, the sewing machine comprising a housing (1) and a feed tooth frame (2) arranged on the housing (1), the outer side of the feed tooth frame (2) being connected to a differential adjustment component (3), characterized in that: The manual tooth lifting adjustment structure comprises a rotating shaft (4) rotatably connected to a casing (1), a crank (5) being vertically fixed at one end of the rotating shaft (4), a push rod (6) being hinged at the upper end of the crank (5), a transmission pin (41) being eccentrically arranged on the end surface of the other end of the rotating shaft (4), a plug-in slot (21) being provided at one end of the cloth feeding tooth frame (2) close to the rotating shaft (4), the transmission pin (41) being embedded in the plug-in slot (21) and being slidably connected to the cloth feeding tooth frame (2) in a forward and backward direction, the push rod (6) being vertically arranged and the upper end of the push rod (6) passing through the upper end of the casing (1), the push rod (6) being movable up and down and driving the rotating shaft (4) to rotate through the crank (5).

2. The manual tooth lifting adjustment structure of the sewing machine head according to claim 1, characterized in that: The upper end of the casing (1) is connected to a guide sleeve (11), the upper end of the push rod (6) is sleeved with a pressing sleeve (61), the upper end of the push rod (6) is abutted against the pressing sleeve (61), and the pressing sleeve (61) is threadedly connected to the guide sleeve (11) and moves up and down.

3. The manual tooth lifting adjustment structure of the sewing machine head according to claim 1 or 2, characterized in that: The housing (1) comprises a feed tooth (12) arranged at one end of a feed tooth frame (2), the differential adjustment assembly (3) comprises a connecting rod (31) connected to the middle part of the feed tooth frame (2), and the transmission pin (41) is connected to the other end of the feed tooth frame (2).

4. The manual tooth lifting adjustment structure of the sewing machine head according to claim 1 or 2, characterized in that: The end of the transmission pin (41) is provided with a transmission block (44), the transmission block (44) is in a square block shape, and the upper and lower groove walls of the insertion groove (21) are in close contact with the transmission block (44).

5. The manual tooth lifting adjustment structure of the sewing machine head according to claim 4, characterized in that: The transmission block (44) is connected with a limit plate (42) which abuts against the outer side of the feed tooth frame (2); the rotating shaft (4) is sleeved with a limit sleeve (43); the limit sleeve (43) is rotatably connected to the housing (1); the limit sleeve (43) is fixedly connected to the rotating shaft (4) via a fastener; one end of the limit sleeve (43) abuts against the inner side of the feed tooth frame (2), and the other end abuts against the side of the crank (5).

6. The manual tooth lifting adjustment structure of the sewing machine head according to claim 1 or 2, characterized in that: A return tension spring (7) arranged vertically is connected inside the housing (1), and one end of the return tension spring (7) is connected to the middle part of the push rod (6).

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