Electronic handwheel and sewing machine

Abstract

The present application relates to the sewing machine technical field, especially electronic hand wheel and a kind of sewing machine comprising the electronic hand wheel.The electronic hand wheel includes shaft, the knob rotatably sleeved in one end of shaft and the support fixed to the other end of shaft, knob is provided with annular magnetic conductive structure, magnetic conductive structure includes multiple soft iron magnets arranged along the circumferential spacing of shaft, support is provided with permanent magnet and sensor for detecting the magnetic field change of permanent magnet, which is arranged opposite to magnetic conductive structure, sensor is connected with controller.Utilize the magnetic conductive characteristics of magnet, generate pulse signal by non-contact mode, due to the attraction between soft iron magnet and permanent magnet, comfortable and abrupt feeling can be produced in the process of knob rotation, and electronic hand wheel can be kept in stable position in static state, and pulse signal will not be generated due to vibration, so that pulse signal output is stable, and there is no "tremor" problem, contact wear is avoided simultaneously, and service life is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of sewing machine technology, and more particularly to an electronic handwheel and a sewing machine including the electronic handwheel. Background Technology

[0002] During the adjustment process of a sewing machine, it is usually necessary to rotate the handwheel to adjust the position of the needle and shuttle, as well as the relative height between the needle and presser foot. For some models, such as heavy-duty sewing machines, rotating the handwheel is too heavy and difficult to adjust. At the same time, for some large sewing machines, due to the excessive length of the machine body, it is impossible to observe the movement of the needle simultaneously while rotating the handwheel.

[0003] To address these issues, electronic handwheel solutions have emerged in the market. However, existing electronic handwheels all employ contact-based rotary switch technology, fixing a spring plate to a knob. Rotation of the knob causes the spring plate to contact and disconnect with surrounding metal protrusions, generating pulse signals. The sewing machine controller then controls the needle position based on these pulse signals. Because these electronic handwheels use a contact method, they are prone to wear and tear, resulting in a generally short lifespan. Furthermore, the switching signals generated by this contact method are always accompanied by "jumping," requiring specialized circuitry to eliminate this vibration, thus increasing cost and complexity. Non-contact handwheels using other technologies are also very expensive. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a non-contact electronic handwheel to overcome the above-mentioned defects of the prior art.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] The present invention provides an electronic handwheel, including a shaft, a knob rotatably sleeved on one end of the shaft, and a bracket fixed on the other end of the shaft. The knob is provided with an annular magnetic guiding structure, which includes a plurality of soft ferromagnets arranged circumferentially along the shaft. The bracket is provided with a permanent magnet disposed opposite to the magnetic guiding structure and a sensor for detecting changes in the magnetic field of the permanent magnet. The sensor is connected to a controller.

[0007] Preferably, there are two permanent magnets and two sensors; the two permanent magnets are arranged circumferentially along the magnetically conductive structure, and when one permanent magnet is opposite to a soft ferromagnet, the other permanent magnet is located between two adjacent soft ferromagnets; the two sensors are used to detect the magnetic field changes of the two permanent magnets respectively.

[0008] Preferably, the soft ferromagnet penetrates the inner and outer peripheral surfaces of the magnetically conductive structure, and the sensor and the permanent magnet are respectively located on the inner and outer peripheral sides of the magnetically conductive structure.

[0009] Preferably, the permanent magnet, the soft ferromagnet, and the sensor are arranged in sequence along the radial direction of the axis.

[0010] Preferably, the bracket is provided with a circuit board, and the circuit board is connected to the sensor.

[0011] Preferably, the knob includes a hollow outer shell forming a concave cavity and an annular non-magnetic bracket extending from the bottom surface of the concave cavity. The non-magnetic bracket is sleeved on the shaft, and a magnetic conductive structure is located at the end of the non-magnetic bracket.

[0012] Preferably, the soft ferromagnet is embedded in a non-magnetic support.

[0013] Preferably, the non-magnetic bracket is mounted on the shaft via a bearing.

[0014] The present invention also provides a sewing machine including an electronic handwheel as described above.

[0015] Compared with the prior art, the present invention has significant progress:

[0016] Utilizing the magnetic properties of magnets, pulse signals are generated in a non-contact manner. Due to the attraction between the soft ferromagnet and the permanent magnet, a comfortable tactile feedback is produced during the rotation of the knob. When static, the electronic handwheel can be kept in a stable position without generating pulse signals due to vibration. Therefore, the pulse signal output is stable and there is no "jumping" problem. At the same time, contact wear is avoided, which greatly improves the service life. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the electronic handwheel according to an embodiment of the present invention.

[0018] Figure 2 This is a front view schematic diagram of the electronic handwheel according to an embodiment of the present invention.

[0019] Figure 3 yes Figure 2 A cross-sectional view along the AA direction.

[0020] Figure 4 This is a schematic diagram of the knob structure in the electronic handwheel of this invention.

[0021] Figure 5 This is a schematic diagram illustrating the working principle of the electronic handwheel in an embodiment of the present invention.

[0022] The reference numerals in the attached figures are explained as follows:

[0023] 1 axis

[0024] 2 knobs

[0025] 21. Outer shell

[0026] 210 Cavity

[0027] 22 Non-magnetic support

[0028] 3 supports

[0029] 4. Magnetic structure

[0030] 41 Soft ferromagnets

[0031] 5 permanent magnets

[0032] 6 sensors

[0033] 7 Circuit Boards

[0034] 8 bearings Detailed Implementation

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0039] like Figures 1 to 5 As shown, this is one embodiment of the electronic handwheel of the present invention.

[0040] See Figures 1 to 3The electronic handwheel in this embodiment includes a shaft 1, a knob 2, and a bracket 3. The knob 2 is rotatably mounted on one end of the shaft 1, and the bracket 3 is fixed to the other end of the shaft 1. The other end of the shaft 1 and the bracket 3 can be fixedly connected by screws. The bracket 3 and the knob 2 are arranged opposite each other along the axial direction of the shaft 1. See also Figure 3 and Figure 4 The knob 2 is provided with a ring-shaped magnetic conductive structure 4. The magnetic conductive structure 4 is coaxially arranged with the shaft 1 and has a gap between it and the outer circumferential surface of the shaft 1. The magnetic conductive structure 4 includes a plurality of soft ferromagnets 41 arranged circumferentially along the shaft 1. The bracket 3 is provided with a permanent magnet 5 and a sensor 6. The permanent magnet 5 is arranged opposite to the magnetic conductive structure 4. The soft ferromagnets 41 on the magnetic conductive structure 4 can interfere with the magnetic field of the permanent magnet 5. The sensor 6 is used to detect the change in the magnetic field of the permanent magnet 5. The sensor 6 is connected to the controller. The sensor 6 converts the detected magnetic induction signal into an electrical signal and outputs it to the controller. The controller receives the signal output by the sensor 6.

[0041] When using the electronic handwheel in this embodiment, please refer to... Figure 5 Rotating knob 2 causes the magnetic conductive structure 4 to rotate accordingly. Multiple soft ferromagnets 41 pass sequentially over permanent magnet 5. Since the soft ferromagnets 41 are magnetically conductive, when a soft ferromagnet 41 passes directly over permanent magnet 5 and is directly opposite it, the sensor 6 detects that the received magnetic induction intensity will increase. At this time, the sensor 6 is activated and outputs a corresponding signal to the controller. When the soft ferromagnet 41 passes over and deviates from permanent magnet 5, permanent magnet 5 is located between two adjacent soft ferromagnets 41, and the received magnetic induction intensity detected by the sensor 6 will decrease. At this time, the sensor 6 stops outputting a signal. Thus, during one rotation of knob 2, the sensor 6 can generate and output a pulse signal. The controller receives this pulse signal and can determine the rotation angle of knob 2 based on the received pulse signal. Based on this rotation angle, the controller sends a corresponding action command to the sewing machine body to control the needle position. In this embodiment, the electronic handwheel utilizes the magnetic properties of a magnet to generate pulse signals in a non-contact manner. Due to the attraction between the soft ferromagnet 41 and the permanent magnet 5, a comfortable tactile feedback is generated during the rotation of the knob 2. When static, the electronic handwheel can be kept in a stable position and will not generate pulse signals due to vibration. Therefore, the pulse signal output is stable and there is no "vibration" problem. At the same time, contact wear is avoided, which greatly improves the service life.

[0042] In this embodiment, sensor 6 can be a Hall sensor or a magnetoresistive sensor. Preferably, see [link to relevant documentation]. Figure 3The bracket 3 is equipped with a circuit board 7, which is connected to the sensor 6. Preferably, a slot can be formed on the bracket 3 to embed the circuit board 7. In this embodiment, the controller can be the controller of the sewing machine body, and the form of the controller is not limited, such as a PLC controller or a microcontroller. In this embodiment, the soft ferromagnet 41 can be a soft iron rod.

[0043] See Figure 5 In this embodiment, to identify the rotation direction of the electronic handwheel, i.e., the rotation direction of the knob 2, preferably, two sets of permanent magnets 5 and sensors 6 are provided on the bracket 3, i.e., two permanent magnets 5 and two sensors 6 are provided. The two permanent magnets 5 are arranged circumferentially at intervals along the magnetically conductive structure 4, and the interval angle between the two permanent magnets 5 satisfies the following condition: when one permanent magnet 5 is opposite to the soft ferromagnet 41, the other permanent magnet 5 is offset from the soft ferromagnet 41 and located between the two adjacent soft ferromagnets 41. The two sensors 6 are used to detect the magnetic field changes of the two permanent magnets 5 respectively. Thus, the pulse signals output by the two sensors 6 have a phase difference, so the rotation direction of the knob 2 can be determined based on the pulse signals output by the two sensors 6. In this embodiment, multiple soft ferromagnets 41 are evenly spaced along the circumference of axis 1. Furthermore, in the circumference of axis 1, the spacing between two adjacent soft ferromagnets 41 is equal to the size of a single soft ferromagnet 41. Assuming the number of soft ferromagnets 41 is N, when the knob 2 rotates one revolution, the number of pulses output by a single sensor 6 is equal to the number of soft ferromagnets 41, N. The angular period of the soft ferromagnets 41 is T = 360° / N. Therefore, the angle between two sensors 6 is an integer multiple of T + T / 4. When one permanent magnet 5 is directly opposite one soft ferromagnet 41, the edge of another permanent magnet 5 is directly opposite the edge of another soft ferromagnet 41.

[0044] See Figure 3 and Figure 5 In this embodiment, preferably, the soft ferromagnet 41 penetrates the inner and outer peripheral surfaces of the magnetically conductive structure 4, and the sensor 6 and the permanent magnet 5 are respectively disposed on the inner and outer peripheral sides of the magnetically conductive structure 4, such that each soft ferromagnet 41 of the magnetically conductive structure 4 passes sequentially between the soft ferromagnet 41 and the sensor 6. More preferably, the permanent magnet 5, the soft ferromagnet 41, and the sensor 6 are arranged sequentially along the radial direction of the axis 1, such that the centers of the permanent magnet 5, the soft ferromagnet 41, and the sensor 6 are located in the same radial plane of the axis 1. In this embodiment, the two sensors 6 are respectively directly opposite the two permanent magnets 5.

[0045] See Figure 3 and Figure 4In this embodiment, preferably, the knob 2 includes a housing 21 and a non-magnetic support 22. The housing 21 has a hollow interior forming a cavity 210. An annular non-magnetic support 22 extends from the bottom surface of the cavity 210 and is sleeved on the shaft 1. The non-magnetic support 22 is coaxially arranged with the shaft 1, and a magnetically conductive structure 4 is disposed at the end of the non-magnetic support 22. In this embodiment, there are gaps between the non-magnetic support 22 and the shaft 1, and between the non-magnetic support 22 and the housing 21, respectively, for accommodating the sensor 6 and the permanent magnet 5, so that the sensor 6 and the permanent magnet 5 can be respectively disposed on the inner and outer peripheries of the magnetically conductive structure 4 at the end of the non-magnetic support 22.

[0046] Preferably, the soft ferromagnet 41 is embedded within the non-magnetic support 22, serving as the magnetic part of the magnetically conductive structure 4. The non-magnetic support 22 between adjacent soft ferromagnets 41 serves as the non-magnetic part of the magnetically conductive structure 4, thereby forming a code disk-type magnetically conductive structure 4. More preferably, the soft ferromagnet 41 can be embedded on the end face of the end of the non-magnetic support 22, and the soft ferromagnet 41 penetrates the inner and outer peripheral surfaces of the end of the non-magnetic support 22.

[0047] See Figure 3 In this embodiment, preferably, the non-magnetic bracket 22 on the knob 2 is mounted on the shaft 1 via the bearing 8, thereby enabling the knob 2 to be rotatably sleeved on one end of the shaft 1.

[0048] See Figure 3 and Figure 5 In this embodiment, preferably, the bracket 3 is a circular plate. One side surface of the circular plate is provided with a slot for mounting the circuit board 7 and a mounting portion for mounting the permanent magnet 5. The mounting portion has mounting holes. The circular plate is preferably an integrally molded injection-molded part. During assembly, the shaft 1 is fixedly connected to the center of the circular plate, the circuit board 7 is embedded in the slot on the circular plate, the sensor 6 is connected to the circuit board 7, and the permanent magnet 5 is embedded in the mounting hole of the mounting portion on the circular plate.

[0049] Based on the above-described electronic handwheel, this embodiment also provides a sewing machine, which includes the above-described electronic handwheel.

[0050] 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. An electronic handwheel, characterized in that, The device includes a shaft (1), a knob (2) rotatably fitted onto one end of the shaft (1), and a bracket (3) fixed to the other end of the shaft (1). The knob (2) has an annular magnetic conductive structure (4), which includes a plurality of soft ferromagnets (41) arranged circumferentially along the shaft (1). The bracket (3) has a permanent magnet (5) opposite to the magnetic conductive structure (4) and a sensor (6) for detecting changes in the magnetic field of the permanent magnet (5). The sensor (6) is connected to the controller. The knob (2) includes an internal... The shell (21) forms a concave cavity (210) and an annular non-magnetic support (22) extends from the bottom surface of the concave cavity (210). The non-magnetic support (22) is sleeved on the shaft (1). The magnetic structure (4) is located at the end of the non-magnetic support (22). The soft ferromagnet (41) is embedded in the non-magnetic support (22). The soft ferromagnet (41) serves as the magnetic part of the magnetic structure (4). The non-magnetic support (22) between adjacent soft ferromagnets (41) serves as the non-magnetic part of the magnetic structure (4).

2. The electronic handwheel according to claim 1, characterized in that, Two permanent magnets (5) and two sensors (6) are provided; the two permanent magnets (5) are arranged circumferentially at intervals along the magnetic conductive structure (4), and when one permanent magnet (5) is opposite to the soft ferromagnet (41), the other permanent magnet (5) is located between two adjacent soft ferromagnets (41); the two sensors (6) are used to detect the magnetic field changes of the two permanent magnets (5).

3. The electronic handwheel according to claim 1, characterized in that, The soft ferromagnet (41) penetrates the inner and outer peripheral surfaces of the magnetically conductive structure (4), and the sensor (6) and the permanent magnet (5) are respectively located on the inner and outer peripheral sides of the magnetically conductive structure (4).

4. The electronic handwheel according to claim 3, characterized in that, The permanent magnet (5), the soft ferromagnet (41) and the sensor (6) are arranged in sequence along the radial direction of the axis (1).

5. The electronic handwheel according to claim 1, characterized in that, The bracket (3) is provided with a circuit board (7), and the circuit board (7) is connected to the sensor (6).

6. The electronic handwheel according to claim 1, characterized in that, The non-magnetic bracket (22) is mounted on the shaft (1) via a bearing (8).

7. A sewing machine, characterized in that, Includes the electronic handwheel as described in any one of claims 1 to 6.

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