Detection mechanism in sewing machine

Abstract

The utility model provides a detection mechanism in a sewing machine, and belongs to the technical field of sewing machines. The problem that the sewing material thickness detection accuracy is not high is solved. The detection mechanism in the sewing machine comprises a detection sensor and a detected piece, the detection sensor comprises a shell and a circuit board fixed in the shell, the detected piece is fixed on one side of a presser foot arm of the sewing machine, the detection mechanism further comprises a mounting bracket fixed on a machine body of the sewing machine and a fixed bracket connected to the mounting bracket, a shell of the detection sensor is connected to the fixing support, the detection sensor is located on one side of the detected piece in the transverse direction, the fixing support can move in the vertical direction relative to the mounting support and can be positioned after moving, and the shell of the detection sensor can move in the transverse direction relative to the fixing support and can be positioned after moving. The method has the advantages of high detection accuracy and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a detection mechanism in a sewing machine. Background Art

[0002] When using a sewing machine for sewing, the thickness of the sewing material may change. The ideal working state is that high speed is required when sewing thin materials and low speed is required when sewing thick materials. However, the speed of existing sewing machines during sewing is fixed, so it is easy to have problems such as reduced sewing machine performance, thread breakage, skipped stitches, and unsightly stitches. In response to this problem, China Patent Application No. 201810039672.1 proposed a sewing machine detection and control system, which includes an electronic control module, a main motor that drives the sewing machine to operate, and a sewing material thickness detection unit. The main motor and the sewing material thickness detection unit are both connected to the electronic control module. The electronic control module adjusts the speed of the main motor in real time according to the output signal of the sewing material thickness detection unit; the sewing material thickness detection unit includes a detection sensor and a test piece that can be sensed by the detection sensor, and the detection sensor is relative to the casing of the sewing machine. The device is fixed and connected with the electric control module, the tested piece is installed on the pressure rod in the sewing machine, the lower end of the pressure rod is installed with a presser foot arm, and the presser foot is installed on the presser foot arm; the detection sensor is a Hall sensor, the tested piece is a magnet, a recessed fixing groove is provided on the outer peripheral surface of the pressure rod, the tested piece is fixed in the fixing groove, the detection sensor is fixedly installed on a bracket, the bracket is fixed on the side cover plate fixed on the casing of the sewing machine, a receiving hole matching with the pressure rod is provided in the side cover plate, and the pressure rod is movably inserted into the receiving hole of the side cover plate along its length direction.

[0003] During the sewing process, the presser foot cooperates with the feed dog in the sewing machine to move the sewing material forward. In this process, the thickness of the sewing material pressed by the presser foot and the thickness of the sewing material passing through the stem can be accurately detected and identified through the cooperation of the Hall sensor and the magnet. When the thickness of the sewing material changes and when sewing through the stem, the sewing material will cause the presser foot to move up and down, and the presser foot drives the presser foot arm to swing up and down around the presser foot shaft. The presser foot arm drives the press rod and the magnet fixed on the press rod to move up and down in the receiving hole of the side cover plate, so that the Hall sensor outputs different voltage values. The electronic control module calculates the real-time thickness H of the sewing material according to the output signal of the Hall sensor and adjusts the speed of the main motor in real time according to the real-time thickness H of the sewing material, or the electronic control module directly adjusts the speed of the main motor in real time according to the output signal of the Hall sensor, thereby avoiding the phenomenon of uneven stitch length when the sewing material becomes thicker or sewing through the stem due to the constant sewing speed.

[0004] However, the above-mentioned sewing machine detection and control system also has shortcomings: during assembly, the detection sensor is fixed on the bracket, and the bracket is fixed on the side cover plate. The position of the detection sensor is fixed, but due to the influence of factors such as processing errors and assembly accuracy, the position of the detection sensor after assembly is inconsistent with the design, which will cause the actual detection accuracy to be low. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a detection mechanism in a sewing machine to solve the problem of low accuracy in detecting the thickness of sewing materials.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A detection mechanism in a sewing machine includes a detection sensor and a piece to be tested, wherein the detection sensor includes a shell and a circuit board fixed in the shell, and is characterized in that the piece to be tested is fixed to one side of a presser foot arm of the sewing machine, and the detection mechanism also includes a mounting bracket fixed to the body of the sewing machine and a fixing bracket connected to the mounting bracket, the shell of the detection sensor is connected to the fixing bracket and the detection sensor is located laterally on one side of the piece to be tested, the fixing bracket can move vertically relative to the mounting bracket and can be positioned after the movement, and the shell of the detection sensor can move laterally relative to the fixing bracket and can be positioned after the movement.

[0008] When the thickness of the sewing material changes and when the sewing is over-stemmed, the presser foot arm will swing, so that the height of the tested piece fixed on the presser foot arm in the vertical direction will change, so that the signal output by the detection sensor will change accordingly, and the electric control module of the sewing machine will adjust the speed of the main motor in real time according to the output signal of the detection sensor. In this detection mechanism, the shell of the detection sensor is connected to a fixed bracket and the fixed bracket is connected to a mounting bracket fixed on the body of the sewing machine, the fixed bracket can move vertically relative to the mounting bracket and can be positioned after moving, and the shell of the detection sensor can move horizontally relative to the fixed bracket and can be positioned after moving, thereby adjusting the position of the detection sensor in the vertical direction and the horizontal position during assembly. Among them, the adjustment of the position of the detection sensor in the vertical direction is to ensure the accuracy of the zero position, and the horizontal position of the detection sensor is to ensure that the tested piece can be better detected by the detection sensor, thereby improving the detection accuracy of the thickness of the sewing material after assembly.

[0009] In the detection mechanism of the sewing machine, the mounting bracket is provided with a waist-shaped adjustment hole 1 in the vertical direction, and the fixed bracket and the mounting bracket are fixed by an adjustment screw 1 which passes through the adjustment hole 1 and is threadedly connected in the fixed bracket.

[0010] Since the adjustment hole is waist-shaped and arranged in the vertical direction, after the adjustment screw is loosened, the fixed bracket can be moved relative to the mounting bracket in the vertical direction by the movement of the adjustment screw along the adjustment hole, and the detection sensor is fixed on the fixed bracket, so the position of the detection sensor in the vertical direction can be adjusted during assembly to ensure the accuracy of the detection of the thickness of the sewing material after leaving the factory. After the adjustment is in place, tightening the adjustment screw can ensure that the position of the detection sensor in the vertical direction remains fixed.

[0011] In the detection mechanism of the sewing machine, the fixed bracket is provided with a waist-shaped adjustment hole 2 in the transverse direction, and the housing of the detection sensor and the fixed bracket are fixed by two adjustment screws passing through the adjustment hole 2 and threadedly connected in the housing.

[0012] Since the second adjustment hole is set in a waist shape along the horizontal direction, after the second adjustment screw is loosened, the housing of the detection sensor can be moved along the second adjustment hole with the help of the second adjustment screw to move along the second adjustment hole, so that the horizontal position of the detection sensor can be adjusted during assembly to ensure the accuracy of the detection of the thickness of the sewing material after leaving the factory. After the adjustment is in place, tightening the second adjustment screw can ensure that the horizontal position of the detection sensor remains fixed.

[0013] In the detection mechanism of the above-mentioned sewing machine, the mounting bracket has a vertically arranged plate body, the fixed bracket has a sheet-shaped connecting portion arranged in the vertical direction, the connecting portion is parallel to and abuts against the plate body, an adjustment hole is arranged on the plate body, and the connecting portion has a connecting hole for threaded connection of the rod of an adjusting screw.

[0014] The connecting part is parallel to and abuts against the plate body, and the adjusting hole is provided on the plate body. Then, after the adjusting screw is loosened, the position of the detection sensor in the vertical direction can be adjusted by the connecting part moving against the plate body.

[0015] In the detection mechanism in the above-mentioned sewing machine, the upper end of the connecting part extends out of the upper edge of the plate body, the fixing bracket also has a positioning part fixedly connected to the upper end of the connecting part, and the second adjustment hole is provided on the positioning part.

[0016] The fixed bracket is connected to the mounting bracket through the connecting part, and is connected to the housing of the detection sensor through the positioning part. The connecting part and the positioning part are two independent positions, thereby ensuring that the detection sensor can be adjusted in both the vertical direction and the horizontal direction. In addition, the positioning part is fixedly connected to the upper end of the connecting part and the upper end of the connecting part extends out of the upper edge of the plate body, thus ensuring that the detection sensor will not interfere with the plate body.

[0017] In the detection mechanism of the above-mentioned sewing machine, the positioning part includes a sheet body 1 perpendicular to the connecting part and a sheet body 2 fixedly connected to one side of the sheet body 1, the sheet body 2 is perpendicular to the sheet body 1 and the connecting part, the adjustment hole 2 is arranged on the sheet body 2, and the outer shell of the detection sensor is box-shaped and one side of it is against the sheet body 2.

[0018] Because the sheet body 1 is perpendicular to the connection part, if the shell of the detection sensor is directly connected to the sheet body 1, the adjustment screw 2 needs to be operated from the vertical direction. However, due to the presence of the sewing machine head and the workbench, it is difficult to operate the adjustment screw 2 from the vertical direction. In this detection mechanism, the shell of the detection sensor is connected to the sheet body 2, the sheet body 2 is fixed to one side of the sheet body 1, and the sheet body 2 is perpendicular to the sheet body 1 and the connection part at the same time, so the adjustment screw 2 can be adjusted from the horizontal direction, which is conducive to the convenience of adjustment by the staff during assembly.

[0019] Compared with the prior art, the detection mechanism in the sewing machine connects the shell of the detection sensor to a fixed bracket and the fixed bracket is connected to a mounting bracket fixed on the body of the sewing machine. The fixed bracket can move vertically relative to the mounting bracket and can be positioned after the movement. The shell of the detection sensor can move horizontally relative to the fixed bracket and can be positioned after the movement. Therefore, the vertical position and the horizontal position of the detection sensor can be adjusted during assembly, thereby improving the detection accuracy of the thickness of the sewing material after assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram showing the presser foot shaft, presser foot arm and presser foot assembly installed on the body of a sewing machine.

[0021] Figure 2 It is a schematic diagram of the detection mechanism in this sewing machine.

[0022] Figure 3 It is a schematic diagram of the connection between the detection sensor, the fixing bracket and the mounting bracket.

[0023] Figure 4 It is an exploded diagram between the fixing bracket and the mounting bracket.

[0024] Figure 5 It is an exploded diagram of the detection sensor and the fixing bracket.

[0025] In the figure, 1, presser foot shaft; 2, presser foot arm; 3, presser foot assembly; 4, measured piece; 5, detection sensor; 5a, shell; 6, mounting bracket; 6a, plate; 6a1, adjustment hole one; 7, fixing bracket; 7a, connecting part; 7a1, connecting hole; 7b, positioning part; 7b1, sheet body one; 7b2, sheet body two; 7b21, adjustment hole two; 8, adjustment screw one; 9, adjustment screw two. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0027] like Figure 1 and Figure 2 As shown, a detection mechanism in a sewing machine, the sewing machine comprises a body, a presser foot shaft 1 arranged in a transverse direction and having one end extending out of the body, and a presser foot arm 2 having one end fixedly connected to the other end of the presser foot shaft 1 extending out of the body, the presser foot shaft 1 being rotatably connected to the body and the presser foot shaft 1 being perpendicular to the presser foot arm 2, and the other end of the presser foot shaft 1 being connected to a presser foot assembly 3. The detection mechanism comprises a detection sensor 5 and a test piece 4, the detection sensor 5 comprising a housing and a circuit board fixed in the housing. The test piece 4 is fixed to one side of the presser foot arm 2, the detection mechanism further comprises a mounting bracket 6 fixed to the body of the sewing machine and a fixing bracket 7 connected to the mounting bracket 6, the housing of the detection sensor 5 is connected to the fixing bracket 7 and the detection sensor 5 is located in a transverse direction on one side of the test piece 4, and the transverse direction referred to in this application refers to the length direction along the body of the sewing machine, that is, the direction from the tail to the head of the machine. Similar to the prior art, the sewing machine in this embodiment also has an electronic control module and a main motor for driving the sewing machine, and the main motor and the detection sensor 5 are both connected to the electronic control module.

[0028] Further, such as Figure 2-Figure 5As shown, the fixing bracket 7 can move vertically relative to the mounting bracket 6 and can be positioned after the movement, and the housing of the detection sensor 5 can move horizontally relative to the fixing bracket 7 and can be positioned after the movement. Specifically, the mounting bracket 6 is provided with a waist-shaped adjustment hole 16a1 in the vertical direction, and the fixing bracket 7 is fixed to the mounting bracket 6 by an adjustment screw 18 whose rod passes through the adjustment hole 16a1 and is threadedly connected in the fixing bracket 7. The fixing bracket 7 is provided with a waist-shaped adjustment hole 27b21 in the horizontal direction, and the housing of the detection sensor 5 is fixed to the fixing bracket 7 by an adjustment screw 29 that passes through the adjustment hole 27b21 and is threadedly connected in the housing. In this embodiment, the mounting bracket 6 has a plate body 6a arranged vertically, and the fixing bracket 7 has a sheet-shaped connection part 7a arranged in the vertical direction, the connection part 7a is parallel to and abuts against the plate body 6a, the adjustment hole 16a1 is provided on the plate body 6a, and the connection part 7a has a connection hole 7a1 for the rod of the adjustment screw 18 to be threadedly connected. The upper end of the connecting portion 7a extends out of the upper edge of the plate body 6a, and the fixing bracket 7 also has a positioning portion 7b fixedly connected to the upper end of the connecting portion 7a, and the second adjustment hole 7b21 is arranged on the positioning portion 7b. The positioning portion 7b includes a sheet 1 7b1 perpendicular to the connecting portion 7a and a sheet 2 7b2 fixedly connected to one side of the sheet 1 7b1. The sheet 2 7b2 is perpendicular to the sheet 1 7b1 and the connecting portion 7a at the same time. The second adjustment hole 7b21 is arranged on the sheet 2 7b2. The outer shell of the detection sensor 5 is box-shaped and one side thereof abuts against the sheet 2 7b2. In practice, the mounting bracket 6 is a mop wheel scissors fixing bracket provided by an existing sewing machine, and the fixing bracket 7 is a sheet metal part.

[0029] When the thickness of the sewing material changes or when sewing through the sewing stem, the sewing material will cause the presser foot assembly 3 to move up and down and cause the presser foot arm 2 to swing with the presser foot shaft 1 as the fulcrum. The swing of the presser foot arm 2 will cause the height of the test piece 4 fixed on the presser foot arm 2 to change in the vertical direction, so the signal output by the detection sensor 5 will change accordingly (in this embodiment, the test piece 4 is a magnet, and the detection sensor 5 is a Hall sensor, so the signal output by the detection sensor 5 when it is actually used is a voltage value), and the electronic control module of the sewing machine will adjust the speed of the main motor in real time according to the output signal of the detection sensor 5.

[0030] In the present detection mechanism, the shell of the detection sensor 5 is connected to a fixed bracket 7 and the fixed bracket 7 is connected to a mounting bracket 6 fixed to the body of the sewing machine. The fixed bracket 7 can move vertically relative to the mounting bracket 6 and can be positioned after the movement. The shell of the detection sensor 5 can move horizontally relative to the fixed bracket 7 and can be positioned after the movement. Thus, the position of the detection sensor 5 in the vertical direction and the horizontal direction can be adjusted during assembly. The adjustment of the position of the detection sensor 5 in the vertical direction is to ensure the accuracy of the zero point position, while the horizontal position of the detection sensor 5 is to ensure that the detected piece 4 can be better detected by the detection sensor 5, thereby improving the accuracy of the detection of the thickness of the sewing material after assembly.

[0031] Specifically, when adjusting the position of the detection sensor 5 in the vertical direction, the adjusting screw 8 is loosened. Since the adjusting hole 6a1 is set in the vertical direction and is waist-shaped, the connecting portion 7a can be moved along the adjusting hole 6a1 by the adjusting screw 8, and the detection sensor 5 is fixed on the fixing bracket 7. Therefore, the position of the detection sensor 5 in the vertical direction can be adjusted during assembly by moving the fixing bracket 7 up and down relative to the mounting bracket 6. After the adjustment is in place, tightening the adjusting screw 8 can ensure that the position of the detection sensor 5 in the vertical direction remains fixed. When adjusting the position of the detection sensor 5 in the horizontal direction, the adjusting screw 29 is loosened. Since the adjusting hole 2 7b21 is set in the horizontal direction and is waist-shaped, the adjusting screw 29 can be moved along the adjusting hole 2 7b21 to adjust the position of the detection sensor 5 in the horizontal direction during assembly. After the adjustment is in place, tightening the adjusting screw 29 can ensure that the position of the detection sensor 5 in the horizontal direction remains fixed.

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

Claims

1. A detection mechanism in a sewing machine, comprising a detection sensor (5) and a detected object (4), wherein the detection sensor (5) comprises a housing (5a) and a circuit board fixed in the housing (5a), characterized in that: The detected object (4) is fixed to one side of the presser foot arm (2) of the sewing machine. The detection mechanism further comprises a mounting bracket (6) fixed to the body of the sewing machine and a fixing bracket (7) connected to the mounting bracket (6). The housing (5a) of the detection sensor (5) is connected to the fixing bracket (7) and the detection sensor (5) is located on one side of the detected object (4) in the horizontal direction. The fixing bracket (7) can move vertically relative to the mounting bracket (6) and can be positioned after the movement. The housing (5a) of the detection sensor (5) can move horizontally relative to the fixing bracket (7) and can be positioned after the movement.

2. The detection mechanism in a sewing machine according to claim 1, characterized in that: The mounting bracket (6) is provided with a waist-shaped adjustment hole (6a1) along the vertical direction, and the fixing bracket (7) and the mounting bracket (6) are fixed by an adjustment screw (8) whose rod passes through the adjustment hole (6a1) and is threadedly connected to the fixing bracket (7).

3. The detection mechanism in a sewing machine according to claim 2, characterized in that: The fixing bracket (7) is provided with a waist-shaped adjustment hole (7b21) in the transverse direction, and the housing (5a) of the detection sensor (5) and the fixing bracket (7) are fixed by means of an adjustment screw (9) passing through the adjustment hole (7b21) and being threadedly connected in the housing (5a).

4. The detection mechanism in a sewing machine according to claim 3, characterized in that: The mounting bracket (6) has a plate body (6a) arranged vertically, and the fixing bracket (7) has a sheet-shaped connecting portion (7a) arranged in the vertical direction, the connecting portion (7a) is parallel to and abuts against the plate body (6a), and an adjustment hole (6a1) is arranged on the plate body (6a), and the connecting portion (7a) has a connecting hole (7a1) for threaded connection of the rod portion of an adjustment screw (8).

5. The detection mechanism in a sewing machine according to claim 4, characterized in that: The upper end of the connecting portion (7a) extends out of the upper edge of the plate body (6a), and the fixed bracket (7) also has a positioning portion (7b) fixedly connected to the upper end of the connecting portion (7a), and the second adjustment hole (7b21) is provided on the positioning portion (7b).

6. The detection mechanism in a sewing machine according to claim 5, characterized in that: The positioning portion (7b) comprises a sheet body 1 (7b1) perpendicular to the connecting portion (7a) and a sheet body 2 (7b2) fixedly connected to one side of the sheet body 1 (7b1), the sheet body 2 (7b2) is perpendicular to both the sheet body 1 (7b1) and the connecting portion (7a), the adjustment hole 2 (7b21) is arranged on the sheet body 2 (7b2), and the housing (5a) of the detection sensor (5) is box-shaped and one side thereof abuts against the sheet body 2 (7b2).

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