CN114775177B - Position detection method and related device for presser foot assembly of sewing machine - Google Patents
Position detection method and related device for presser foot assembly of sewing machine Download PDFInfo
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- CN114775177B CN114775177B CN202210366978.4A CN202210366978A CN114775177B CN 114775177 B CN114775177 B CN 114775177B CN 202210366978 A CN202210366978 A CN 202210366978A CN 114775177 B CN114775177 B CN 114775177B
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
- D05B29/12—Presser-foot attachment
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
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Abstract
The application discloses a position detection method of a presser foot assembly of a sewing machine, which relates to the field of sewing machines and comprises the following steps: detecting the inductance of a spring coil on the presser foot assembly; judging whether the detected inductance value and a preset inductance value of the spring coil meet preset conditions, wherein the preset inductance value is the inductance value of the spring coil when the presser foot assembly is placed at a target position; if the detected inductance value and the preset inductance value of the spring coil meet the preset conditions, the presser foot assembly is placed at the target position; if the detected inductance of the spring coil and the preset inductance do not meet the preset condition, the presser foot assembly is not placed at the target position. The method can accurately and reliably detect whether the presser foot assembly is placed in place or not, and has strong applicability. The application also discloses a position detection device and equipment of the presser foot assembly of the sewing machine and a computer readable storage medium, which have the technical effects.
Description
Technical Field
The application relates to the technical field of sewing machines, in particular to a position detection method of a presser foot assembly of a sewing machine; also relates to a position detection device, equipment and computer readable storage medium of the sewing machine presser foot assembly.
Background
Currently, the detection device of the presser foot assembly in the overseam sewing machine generally adopts a hall sensor, and detects whether the presser foot is put in place or not by utilizing the principle of hall effect. The hall sensor is fixed on the presser foot structure, and when the presser foot is placed in place, the hall sensor is close to magnetic steel on another mechanism, and the hall sensor outputs a low level to indicate that the presser foot assembly is placed in place. When the presser foot assembly is not placed in place, the Hall sensor leaves the magnetic steel on the other mechanism, and the Hall sensor outputs a high level to indicate that the presser foot assembly is not placed in place. However, the detection scheme adopting the Hall sensor has the defects of complex installation and debugging, low induction precision, easiness in electrostatic damage of the Hall sensor and the like, so that certain hidden danger exists for the safety of sewing.
In view of this, providing a detection scheme with high accuracy, reliability and higher applicability has become a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The application aims to provide a position detection method for a presser foot assembly of a sewing machine, which can accurately and reliably detect whether the presser foot assembly is placed in place or not and has strong applicability. Another object of the present application is to provide a position detecting device, apparatus and computer readable storage medium of a presser foot assembly of a sewing machine, which have the above technical effects.
In order to solve the technical problems, the application provides a position detection method of a presser foot assembly of a sewing machine, comprising the following steps:
detecting the inductance of a spring coil on the presser foot assembly;
judging whether the detected inductance value and a preset inductance value of the spring coil meet preset conditions, wherein the preset inductance value is the inductance value of the spring coil when the presser foot assembly is placed at a target position;
if the detected inductance value of the spring coil and the detected preset inductance value meet the preset condition, the presser foot assembly is placed at the target position;
and if the detected inductance of the spring coil and the preset inductance do not meet the preset condition, the presser foot assembly is not placed at the target position.
Optionally, the determining whether the detected inductance value and the preset inductance value of the spring coil meet the preset condition includes:
judging whether the detected inductance value of the spring coil is equal to a preset inductance value or not;
if the inductance value of the spring coil is equal to the preset inductance value, the detected inductance value of the spring coil and the detected inductance value meet the preset condition;
if the inductance value of the spring coil is not equal to the preset inductance value, the detected inductance value of the spring coil and the detected inductance value of the spring coil do not meet the preset condition.
Optionally, the method further comprises:
and when the presser foot assembly is detected to be placed at the target position, performing in-place indication.
Optionally, the method further comprises:
and when the presser foot assembly is detected not to be placed at the target position, alarming and reminding are carried out.
In order to solve the technical problem, the application also provides a position detection device of the presser foot assembly of the sewing machine, which comprises:
the inductance detection module is used for detecting the inductance of the spring coil on the presser foot assembly;
the judging module is used for judging whether the detected inductance value and a preset inductance value of the spring coil meet preset conditions or not, wherein the preset inductance value is the inductance value of the spring coil when the presser foot assembly is placed at a target position;
the presser foot assembly position determining module is used for placing the presser foot assembly at the target position if the detected inductance value of the spring coil and the detected preset inductance value meet the preset condition; and if the detected inductance of the spring coil and the preset inductance do not meet the preset condition, the presser foot assembly is not placed at the target position.
Optionally, the judging module is specifically configured to: judging whether the detected inductance value of the spring coil is equal to a preset inductance value or not; if the inductance value of the spring coil is equal to the preset inductance value, the detected inductance value of the spring coil and the detected inductance value meet the preset condition; if the inductance value of the spring coil is not equal to the preset inductance value, the detected inductance value of the spring coil and the detected inductance value of the spring coil do not meet the preset condition.
Optionally, the method further comprises:
and the indicating module is used for indicating in-place when the presser foot assembly is detected to be placed at the target position.
Optionally, the method further comprises:
and the alarm module is used for carrying out alarm reminding when the presser foot assembly is detected not to be placed at the target position.
In order to solve the technical problem, the application also provides a position detection device of the presser foot assembly of the sewing machine, comprising:
a memory for storing a computer program;
a processor for performing the steps of the method for detecting the position of the presser foot assembly of a sewing machine as described in any one of the above, when executing the computer program.
To solve the above technical problem, the present application further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the position detection method of the presser foot assembly of a sewing machine as described in any one of the above.
The application provides a position detection method of a presser foot assembly of a sewing machine, which comprises the following steps: detecting the inductance of a spring coil on the presser foot assembly; judging whether the detected inductance value and a preset inductance value of the spring coil meet preset conditions, wherein the preset inductance value is the inductance value of the spring coil when the presser foot assembly is placed at a target position; if the detected inductance value of the spring coil and the detected preset inductance value meet the preset condition, the presser foot assembly is placed at the target position; and if the detected inductance of the spring coil and the preset inductance do not meet the preset condition, the presser foot assembly is not placed at the target position.
Therefore, the position detection method of the presser foot assembly of the sewing machine provided by the application takes the spring coil on the presser foot mechanism as the inductance coil, and when the presser foot assembly is placed in place and not in place, the inductance value of the spring coil is different, so that whether the presser foot assembly is placed in place can be accurately and reliably detected by detecting and analyzing the inductance value of the spring coil. The detection method does not need a Hall sensor, has no problem of electrostatic breakdown Hall, has lower environmental requirements, and has simple structure, low cost and stronger applicability.
The position detection device, the device and the computer readable storage medium of the presser foot assembly of the sewing machine have the technical effects.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for detecting the position of a presser foot assembly of a sewing machine according to an embodiment of the application;
FIG. 2 is a schematic view of a presser foot mechanism according to an embodiment of the application;
FIG. 3 is a schematic view of a position detecting device of a presser foot assembly of a sewing machine according to an embodiment of the application;
fig. 4 is a schematic view of a position detecting apparatus of a presser foot assembly of a sewing machine according to an embodiment of the application.
Detailed Description
The core of the application is to provide a position detection method of a presser foot assembly of a sewing machine, which can accurately and reliably detect whether the presser foot assembly is placed in place or not and has stronger applicability. Another core of the present application is to provide a position detecting device, apparatus and computer readable storage medium for a presser foot assembly of a sewing machine, which have the above technical effects.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, fig. 1 is a flowchart of a method for detecting a position of a presser foot assembly of a sewing machine according to an embodiment of the application, and referring to fig. 1, the method mainly includes:
s101: detecting the inductance of a spring coil on the presser foot assembly;
referring to fig. 2, the presser foot mechanism of the sewing machine mainly includes a spring coil 1, a presser foot link 2, a presser foot assembly 3, and a feed dog plate 4. The spring coil 1 is arranged in the presser foot connecting rod 2, and the presser foot connecting rod 2 presses the presser foot assembly 3 and the feed dog needle plate 4 by utilizing the elasticity of the spring coil 1. The compression length of the spring coil is different when the presser foot assembly is placed in place than when the presser foot assembly is not placed in place. When the lengths of the spring coils are different, the inductance values thereof are different.
The relationship between the inductance of the spring coil and the length of the spring coil is shown as follows:
L＝(k*μ 0 *μ s *N 2 *S)/l；
in the above formula, L is the inductance of the spring coil, and k=2r/L; r is the radius of the spring coil, l is the length of the spring coil, μ 0 Is vacuum permeability, and mu 0 ＝4π*10 -7 ，μ s For the relative permeability of the core inside the spring coil, N 2 The square of the number of turns of the spring coil, S is the cross-sectional area of the spring coil.
Substituting k=2r/L into l= (k×μ) 0 *μ s *N 2 * S)/l, obtainable: l= (2 r μ) 0 *μ s *N 2 *S)/l 2 。
It can be seen that the inductance of a spring coil is linearly related to the square of the length of the spring coil when the number of turns, the radius, of the spring coil is fixed.
Based on the above, the application uses the spring coil on the presser foot assembly as an inductance coil, uses the inductance of the spring coil as a judgment basis, and judges whether the presser foot assembly is in place by detecting the inductance of the spring coil. The method for detecting the inductance of the spring coil on the presser foot assembly is not repeated, and can refer to any existing scheme for detecting the inductance, and any existing inductance detection equipment can be used.
S102: judging whether the detected inductance value and a preset inductance value of the spring coil meet preset conditions, wherein the preset inductance value is the inductance value of the spring coil when the presser foot assembly is placed at a target position;
s103: if the detected inductance value of the spring coil and the detected preset inductance value meet the preset condition, the presser foot assembly is placed at the target position;
s104: and if the detected inductance of the spring coil and the preset inductance do not meet the preset condition, the presser foot assembly is not placed at the target position.
The target position refers to the position of the presser foot assembly when the presser foot assembly is in place. The preset inductance value refers to the inductance of the spring coil when the presser foot assembly is in place. The presser foot assembly is placed in place, namely the presser foot connecting rod presses the presser foot assembly, and the presser foot assembly and the feed dog needle plate are interacted. Conversely, the lack of placement of the presser foot assembly means that the presser foot link does not press the presser foot assembly, and there is no interaction between the presser foot assembly and the feed dog plate.
Assuming the presser foot assembly is in place, the spring coil has a length of l 0 Then the presser foot assembly is in place, the inductance L of the spring coil 0 The (i.e. preset inductance) is:after the inductance value of the spring coil is detected, the sewing machine controller analyzes the detected inductance value and a preset inductance value and judges whether the detected inductance value and the preset inductance value of the spring coil meet preset conditions. If the detected inductance value of the spring coil and the detected preset inductance value meet the preset condition, the presser foot assembly is placed at the target position; and if the detected inductance of the spring coil and the preset inductance do not meet the preset condition, the presser foot assembly is not placed at the target position.
In some embodiments, the method for determining whether the detected inductance value and the preset inductance value of the spring coil meet the preset condition is as follows: judging whether the detected inductance value of the spring coil is equal to a preset inductance value or not; if the inductance value of the spring coil is equal to the preset inductance value, the detected inductance value of the spring coil and the detected inductance value meet the preset condition; if the inductance value of the spring coil is not equal to the preset inductance value, the detected inductance value of the spring coil and the detected inductance value of the spring coil do not meet the preset condition.
In this embodiment, the preset condition is that the detected inductance value of the spring coil is equal to the preset inductance value. Such asIf the detected inductance of the spring coil is equal to L 0 And the detected inductance value of the spring coil and the preset inductance value meet the preset condition, so that the presser foot assembly is placed in place. Conversely, if the detected inductance of the spring coil is not equal to L 0 And if the detected inductance value of the spring coil and the preset inductance value do not meet the preset condition, indicating that the presser foot assembly is not placed in place.
In order to avoid the influence of the micro deformation of the radius of the spring coil and the like and the judgment of whether the presser foot assembly is placed in place by external interference factors, in some embodiments, the mode of judging whether the detected inductance value and the preset inductance value of the spring coil meet the preset condition may be as follows: judging whether the detected difference value between the inductance value of the spring coil and the preset inductance value is located in a preset interval; if yes, the detected inductance value of the spring coil and the preset inductance value meet the preset condition; if not, the detected inductance value of the spring coil and the preset inductance value do not meet the preset condition.
In this embodiment, the preset condition is that the difference between the detected inductance value of the spring coil and the preset inductance value is located in a preset interval. According to the embodiment, the preset interval is set, so that the inductance value of the spring coil detected when the presser foot assembly is placed in place is allowed to deviate slightly from the inductance value of the spring coil, namely the preset inductance value, when the presser foot assembly is placed in place in theory, and therefore judgment accuracy and reliability are ensured.
Further, an in-place indication may be made when placement of the presser foot assembly to the target location is detected. For example, the in-place indication is performed by means of lighting an indicator lamp, voice broadcasting and the like, so that an operator is informed of the in-place placement of the presser foot assembly.
Further, when the presser foot assembly is detected not to be placed at the target position, an alarm prompt can be carried out, and the problem of broken needle wire caused when the presser foot assembly is not placed in place is avoided. For example, the alarm can be given by extinguishing the indicator lamp, flashing the indicator lamp, broadcasting by voice, etc., so as to inform the operator that the presser foot assembly is not in place.
According to the embodiment of the application, whether the presser foot assembly is placed in place or not is judged based on the difference of inductance of the spring coil when the presser foot assembly is placed in place and the difference of results such as mutual inductance and eddy current of the spring coil when the presser foot assembly is placed in place or not can be judged based on the idea of the embodiment of the application.
In summary, according to the position detection method for the presser foot assembly of the sewing machine provided by the application, the spring coil on the presser foot mechanism is used as the inductance coil, and when the presser foot assembly is placed in place and not in place, the inductance of the spring coil is different, so that whether the presser foot assembly is placed in place can be accurately and reliably detected by detecting and analyzing the inductance of the spring coil. The detection method does not need a Hall sensor, has no problem of electrostatic breakdown Hall, has lower environmental requirements, and has simple structure, low cost and stronger applicability.
The application also provides a position detection device of the presser foot assembly of the sewing machine, and the device can be correspondingly referred to the method. Referring to fig. 3, fig. 3 is a schematic diagram of a position detecting device of a presser foot assembly of a sewing machine according to an embodiment of the application, and in combination with fig. 3, the device includes:
the inductance value detection module 1 is used for detecting the inductance value of the spring coil on the presser foot assembly;
the judging module 20 is configured to judge whether the detected inductance value and a preset inductance value of the spring coil meet a preset condition, where the preset inductance value is the inductance value of the spring coil when the presser foot assembly is placed at the target position;
a presser foot assembly position determining module 30, configured to, if the detected inductance value of the spring coil and the preset inductance value meet the preset condition, place the presser foot assembly at the target position; and if the detected inductance of the spring coil and the preset inductance do not meet the preset condition, the presser foot assembly is not placed at the target position.
On the basis of the foregoing embodiment, as a specific implementation manner, the judging module 20 is specifically configured to: judging whether the detected inductance value of the spring coil is equal to a preset inductance value or not; if the inductance value of the spring coil is equal to the preset inductance value, the detected inductance value of the spring coil and the detected inductance value meet the preset condition; if the inductance value of the spring coil is not equal to the preset inductance value, the detected inductance value of the spring coil and the detected inductance value of the spring coil do not meet the preset condition.
On the basis of the above embodiment, as a specific implementation manner, the method further includes:
and the indicating module is used for indicating in-place when the presser foot assembly is detected to be placed at the target position.
On the basis of the above embodiment, as a specific implementation manner, the method further includes:
and the alarm module is used for carrying out alarm reminding when the presser foot assembly is detected not to be placed at the target position.
According to the position detection device for the presser foot assembly of the sewing machine, the spring coil on the presser foot mechanism is used as the inductance coil, and when the presser foot assembly is placed in place and not in place, the inductance value of the spring coil is different, so that whether the presser foot assembly is placed in place can be accurately and reliably detected by detecting and analyzing the inductance value of the spring coil. The detection method does not need a Hall sensor, has no problem of electrostatic breakdown Hall, has lower environmental requirements, and has simple structure, low cost and stronger applicability.
The present application also provides a position detecting apparatus for a presser foot assembly of a sewing machine, which includes a memory 11 and a processor 12, as shown with reference to fig. 4.
A memory 11 for storing a computer program;
a processor 12 for executing a computer program to perform the steps of:
detecting the inductance of a spring coil on the presser foot assembly; judging whether the detected inductance value and a preset inductance value of the spring coil meet preset conditions, wherein the preset inductance value is the inductance value of the spring coil when the presser foot assembly is placed at a target position; if the detected inductance value of the spring coil and the detected preset inductance value meet the preset condition, the presser foot assembly is placed at the target position; and if the detected inductance of the spring coil and the preset inductance do not meet the preset condition, the presser foot assembly is not placed at the target position.
For the description of the apparatus provided by the present application, refer to the above method embodiment, and the description of the present application is omitted herein.
The present application also provides a computer readable storage medium having a computer program stored thereon, which when executed by a processor, performs the steps of:
detecting the inductance of a spring coil on the presser foot assembly; judging whether the detected inductance value and a preset inductance value of the spring coil meet preset conditions, wherein the preset inductance value is the inductance value of the spring coil when the presser foot assembly is placed at a target position; if the detected inductance value of the spring coil and the detected preset inductance value meet the preset condition, the presser foot assembly is placed at the target position; and if the detected inductance of the spring coil and the preset inductance do not meet the preset condition, the presser foot assembly is not placed at the target position.
The computer readable storage medium may include: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
For the description of the computer-readable storage medium provided by the present application, refer to the above method embodiments, and the disclosure is not repeated here.
In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the apparatus, device and computer readable storage medium of the embodiment disclosure, since it corresponds to the method of the embodiment disclosure, the description is relatively simple, and the relevant points refer to the description of the method section.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The method, the device, the equipment and the computer readable storage medium for detecting the position of the presser foot assembly of the sewing machine provided by the application are described in detail above. The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present application and its core ideas. It should be noted that it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the principles of the application, which are also intended to fall within the scope of the appended claims.
Claims (6)
1. A method of detecting the position of a presser foot assembly of a sewing machine, comprising:
detecting the inductance of a spring coil on the presser foot assembly;
judging whether the detected inductance value and a preset inductance value of the spring coil meet preset conditions, wherein the preset inductance value is the inductance value of the spring coil when the presser foot assembly is placed at a target position;
if the detected inductance value of the spring coil and the detected preset inductance value meet the preset condition, the presser foot assembly is placed at the target position;
if the detected inductance of the spring coil and the preset inductance do not meet the preset condition, the presser foot assembly is not placed at the target position;
further comprises:
when the presser foot assembly is detected to be placed at the target position, an in-place indication is carried out;
and when the presser foot assembly is detected not to be placed at the target position, alarming and reminding are carried out.
2. The position detecting method according to claim 1, wherein the determining whether the detected inductance value and the preset inductance value of the spring coil satisfy a preset condition includes:
judging whether the detected inductance value of the spring coil is equal to a preset inductance value or not;
if the inductance value of the spring coil is equal to the preset inductance value, the detected inductance value of the spring coil and the detected inductance value meet the preset condition;
if the inductance value of the spring coil is not equal to the preset inductance value, the detected inductance value of the spring coil and the detected inductance value of the spring coil do not meet the preset condition.
3. A position detection device for a presser foot assembly of a sewing machine, comprising:
the inductance detection module is used for detecting the inductance of the spring coil on the presser foot assembly;
the judging module is used for judging whether the detected inductance value and a preset inductance value of the spring coil meet preset conditions or not, wherein the preset inductance value is the inductance value of the spring coil when the presser foot assembly is placed at a target position;
the presser foot assembly position determining module is used for placing the presser foot assembly at the target position if the detected inductance value of the spring coil and the detected preset inductance value meet the preset condition; if the detected inductance of the spring coil and the preset inductance do not meet the preset condition, the presser foot assembly is not placed at the target position;
further comprises:
the indicating module is used for indicating in-place when the presser foot assembly is detected to be placed at the target position;
and the alarm module is used for carrying out alarm reminding when the presser foot assembly is detected not to be placed at the target position.
4. The position detection apparatus according to claim 3, wherein the judging module is specifically configured to: judging whether the detected inductance value of the spring coil is equal to a preset inductance value or not; if the inductance value of the spring coil is equal to the preset inductance value, the detected inductance value of the spring coil and the detected inductance value meet the preset condition; if the inductance value of the spring coil is not equal to the preset inductance value, the detected inductance value of the spring coil and the detected inductance value of the spring coil do not meet the preset condition.
5. A position detection apparatus for a presser foot assembly of a sewing machine, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method for detecting the position of a presser foot assembly of a sewing machine according to claim 1 or 2 when executing said computer program.
6. A computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, which when executed by a processor, implements the steps of the method for detecting the position of a sewing machine presser foot assembly according to claim 1 or 2.
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| CN202210366978.4A CN114775177B (en) | 2022-04-08 | 2022-04-08 | Position detection method and related device for presser foot assembly of sewing machine |
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| CN202210366978.4A CN114775177B (en) | 2022-04-08 | 2022-04-08 | Position detection method and related device for presser foot assembly of sewing machine |
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