A sewing machine that can automatically switch sewing conditions

Abstract

To provide a sewing machine capable of automatically switching sewing states. [Solution] A sewing machine (100) capable of automatically switching sewing states includes a sewing platform (10), an arm (20), a detection device (30), and a control device. The sewing platform has a housing and a cloth feed unit. A sewing area is defined on the top surface of the housing. The arm is provided above the sewing platform and carries a sewing needle group (22) and moves it back and forth in the sewing area. The detection device includes a light emitting / receiving unit (31) and a light reflecting unit (32). The light emitting / receiving unit is provided on the arm, and the light reflecting unit is provided on the side wall of the housing. When the fabric shields the light reflecting unit, the light emitting / receiving unit does not receive a reflected light signal, and the cloth feed unit pushes the fabric at a first speed. In the opposite case, the light emitting / receiving unit receives a reflected light signal, and the cloth feed unit pushes the fabric at a second speed slower than the first speed.

Description

[Technical Field]

[0001] The present invention relates to a sewing machine, and in particular to a sewing machine that can detect whether the edge of the fabric has been sewn and automatically switch the sewing state. [Background technology]

[0002] In typical sewing operations, it is generally necessary to reinforce the edges of the fabric by, for example, using multiple backstitches or tightly stitching the stitches to prevent the ends of the sewing thread from fraying as the stitching of the fabric is about to be completed.

[0003] However, in conventional sewing operations, the operator manually controls the sewing machine to perform tight stitching or backstitching at the ends, which not only impairs the smoothness of the stitching and reduces production efficiency, but also results in varying stitching quality depending on the operator. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] none Summary of the Invention [Problem to be solved by the invention]

[0005] In order to solve the above problems, the present invention provides a sewing machine that can automatically switch sewing states, thereby solving the problems of the prior art, where the dense sewing work at the edge of the fabric is done manually, resulting in reduced efficiency and inconsistent quality. [Means for solving the problem]

[0006] To achieve the above object, the present invention provides a sewing machine including a sewing platform, an arm, a detection device, and a control device. The sewing platform includes a housing, a storage space located within the housing, and a cloth feed unit located within the storage space. The housing includes a top surface and two opposing side walls extending downward on either side of the top surface. A sewing area is defined on the top surface, and the cloth feed unit is exposed from the sewing area. The arm is located above the sewing platform and includes a group of sewing needles that move vertically back and forth toward the sewing area. The detection device includes a light reflecting unit and a light emitting / receiving unit. The light reflecting unit is located on one side wall of the housing and adjacent to the sewing area. The light emitting / receiving unit is located on the arm and faces the light reflecting unit. The light emitting / receiving unit emits an optical signal to the light reflecting unit and receives a reflected optical signal reflected by the light reflecting unit. The control device is connected to the light emitting / receiving unit and the cloth feed unit. When the light reflecting unit is blocked by the fabric, the light emitting and receiving unit does not receive the reflected light signal and generates and sends a first signal to the control device, which controls the fabric feed unit to push the fabric at a first speed, putting the sewing machine in a first sewing state. When the edge of the fabric enters the sewing area and exposes the light reflecting unit, the light emitting and receiving unit receives the reflected light signal and generates a second signal to the control device, which controls the fabric feed unit to push the fabric at a second speed slower than the first speed, putting the sewing machine in a second sewing state.

[0007] In one embodiment, the sewing area has a fabric supply edge and a fabric discharge edge, the fabric feed unit pushes the fabric from the fabric supply edge to the fabric discharge edge, and the light reflecting unit is adjacent to the fabric supply edge of the sewing area.

[0008] In one embodiment, the stitch pitch occurring in the second sewing state is smaller than the stitch pitch occurring in the first sewing state.

[0009] In one embodiment, the thread density formed in the second stitching state is greater than the thread density formed in the first stitching state.

[0010] In one embodiment, the light emitting / receiving unit is provided on the underside of the arm. [Effects of the Invention]

[0011] By implementing the invention as described above, it has the following advantages over the prior art: The light-emitting / receiving unit detects whether there is a reflected signal from the light-reflecting unit, and determines whether the edge of the fabric has been sewn, and automatically switches the sewing state, allowing the sewing machine to switch directly from the normal sewing state to the dense sewing state, completing the stitching reinforcement work without manual labor, which not only greatly improves production efficiency but also ensures consistent quality of the dense sewing at the edge of the fabric. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a schematic diagram of the three-dimensional structure of the present invention. [Figure 2] FIG. 2 is a schematic diagram of the three-dimensional structure of the present invention from another angle. [Figure 3] 2 is a partially enlarged schematic view of the sewing platform of the present invention; [Figure 4] FIG. 2 is a block diagram showing the control device of the present invention connected to the light emitting / receiving unit and the cloth feeding unit. DETAILED DESCRIPTION OF THE INVENTION

[0013] The technical contents of the present invention will be described in detail below with reference to the drawings. 1 to 4, the present invention provides a sewing machine 100 that automatically switches sewing states, which includes a sewing platform 10, an arm 20, a detection device 30, and a control device 40. As shown in FIGS. 1 and 2, the main body of the sewing machine 100 (shown by dashed lines in the figures) includes a base 1, the sewing platform 10 extending outward from the side of the base 1, and an arm 20 fixed to the base 1, the arm 20 being disposed above the sewing platform 10 and spaced apart from it. The detection device 30 is disposed in the housing of the main body of the sewing machine 100, and the control device 40 is disposed inside the main body of the sewing machine 100 (not shown), and details thereof will be described later.

[0014] 1 and 3, sewing platform 10 includes a housing 11, an accommodation space 12 located within housing 11, and a cloth feed unit 13 provided within accommodation space 12. Housing 11 includes a top surface 111 and two side walls 112 provided opposite each other on either side of top surface 111. In one embodiment, sewing platform 10 has a long, cylindrical structure, top surface 111 is a flat rectangular surface, and two side walls 112 extend downward from two opposing long sides of top surface 111, respectively. Top surface 111 defines a sewing area 113 at an end remote from base 111, where fabric (not shown) is sewn.

[0015] The cloth feed unit 13 is composed of a plurality of cloth feed teeth, and is exposed from the sewing area 113 on the top surface 111 of the housing 11, and pushes out the fabric. In one embodiment, the sewing area 113 is defined with a cloth feeding end 113a and a cloth discharging end 113b, the cloth feeding end 113a being the end of the sewing area 113 that is close to the base 1, and the cloth discharging end 113b being the end of the sewing area 113 that is far from the base 1. The cloth feed unit 13 pushes out the fabric from the cloth feeding end 113a to the cloth discharging end 113b.

[0016] Arm 20 is mounted above sewing platform 10 and includes a sewing assembly 21 that extends downward toward sewing area 113, with the distal end of sewing assembly 21 having a group of sewing needles 22 that reciprocate vertically toward sewing area 113. Sewing needles 22 perform a sewing operation in sewing area 113.

[0017] 1 to 3, the detection device 30 includes a light-emitting / light-receiving unit 31 and a light-reflecting unit 32. The light-reflecting unit 32 is provided on one side wall 112 of the housing 11 of the sewing platform 10. That is, the light-reflecting unit 32 is not provided on the top surface 111 of the housing 11, but is located on a different plane from the sewing area 113. Furthermore, the light-reflecting unit 32 is adjacent to the sewing area 113, and in one embodiment, as shown in FIG. 3, the light-reflecting unit 32 is close to the fabric feeding end 113a of the sewing area 113. In one embodiment, the light-reflecting unit 32 may be, but is not limited to, a reflective sticker, a metal plate, a substrate coated with a reflective material, or the like.

[0018] The light-emitting and light-receiving unit 31 is provided on the arm 20 and faces the light-reflecting unit 32. The light-emitting and light-receiving unit 31 includes a light-emitting portion 311 and a light-receiving portion 312. The light-emitting portion 311 is configured to continuously emit an optical signal to the light-reflecting unit 32 while the sewing machine 100 is operating, and the light-receiving portion 312 is configured to receive a reflected optical signal generated by the light-reflecting unit 32 when the sewing machine 100 is operating. The light-emitting and light-receiving unit 31 generates a different corresponding operating signal depending on whether it receives the reflected optical signal. In one embodiment, the detection device 30 further includes a fixed frame 33. The fixed frame 33 is attached to the arm 20 and supports and fixes the light-emitting and light-receiving unit 31, with the light-emitting and light-receiving unit 31 being provided on the underside of the arm 20.

[0019] Referring to FIG. 4, the control device 40 is connected to the light emitting / receiving unit 31 and the cloth feeding unit 13, receives an operation signal generated by the light emitting / receiving unit 31, and controls the operation of the cloth feeding unit 13 based on the operation signal.

[0020] In detail, during the sewing process, when the end of the fabric has not yet been sewn, the unsewn fabric blocks the light reflecting unit 32 adjacent to the sewing area 113. When the light reflecting unit 32 is blocked by the fabric, the light reflecting unit 32 cannot reflect the optical signal emitted by the light emitting unit 311, and at this time, the light receiving unit 312 does not receive the reflected optical signal, and the light emitting and receiving unit 31 accordingly generates a first signal and sends it to the control device 40. Based on the first signal, the control device 40 controls the fabric feeding unit 13 to push out the fabric at a first speed, and at this time, the sewing machine 100 is in a first sewing state and performs a general normal sewing operation.

[0021] However, when sewing is performed up to the end of the fabric, there is no fabric blocking the light reflecting unit 32, and the end of the fabric enters the sewing area 113, exposing the light reflecting unit 32. The light reflecting unit 32 reflects the optical signal emitted by the light emitting unit 311 to generate a reflected light signal. At this time, the light receiving unit 312 receives the reflected light signal, and the light emitting and receiving unit 31 generates a second signal in response and sends it to the control device 40. Based on the second signal, the control device 40 controls the fabric feeding unit 13 to push out the fabric at a second speed, and because the second speed is lower than the first speed, the sewing machine 100 is in a second sewing state. The second speed is lower than the first speed, i.e., the speed at which the fabric feed unit 13 pushes and moves the fabric is slower. Therefore, when the sewing speed of the sewing needle group 22 is the same, the number of times the needles move down per unit distance increases, thereby enabling denser sewing and a reinforcing effect on the end of the fabric. In one embodiment, the stitch pitch generated in the second sewing state of the sewing machine 100 is smaller than the stitch pitch generated in the first sewing state. In another embodiment, the stitch density formed in the second sewing state of the sewing machine 100 is higher than the stitch density formed in the first sewing state. [Explanation of symbols]

[0022] 100 sewing machines 1 base 10 Sewing Platform 11. Housing 111 Top 112 Side wall 113 Sewing area 113a Material feeding end 113b Discharge cloth end 12 Containment Space 13 Cloth feed unit 20 Arm 21 Sewing Assembly 22 Sewing needles 30 Detection Device 31 Light-emitting / receiving unit 311 Light-emitting part 312 Light receiving part 32 Light Reflection Unit 33 Fixed Frame 40 Control device

Claims

1. A sewing machine that can automatically switch sewing states, a sewing platform including a housing, an accommodation space located within the housing, and a cloth feed unit provided in the accommodation space, the housing including a top surface and two opposing side walls extending downward on both sides of the top surface, a sewing area defined on the top surface, the cloth feed unit exposed from the sewing area; an arm disposed above the sewing platform and including a group of sewing needles that reciprocate vertically toward the sewing area; a detection device including a light reflecting unit and a light emitting / receiving unit, the light reflecting unit being provided on one side wall of the housing and adjacent to the sewing area, the light emitting / receiving unit being provided on the arm and facing the light reflecting unit, the light emitting / receiving unit emitting an optical signal to the light reflecting unit and receiving a reflected optical signal reflected by the light reflecting unit; a control device connected to the light emitting / receiving unit and the cloth feeding unit, When the light reflecting unit is blocked by the fabric, the light emitting / receiving unit does not receive the reflected light signal, and generates and sends a first signal to the control device, which controls the fabric feeding unit to push out the fabric at a first speed, and puts the sewing machine into a first sewing state; When the edge of the fabric enters the sewing area and exposes the light reflecting unit, the light emitting / receiving unit receives the reflected light signal and generates a second signal to the control device, and the control device controls the fabric feeding unit to push out the fabric at a second speed lower than the first speed, thereby putting the sewing machine into a second sewing state. A sewing machine characterized by:

2. 2. The sewing machine according to claim 1, wherein the sewing area has a fabric supply end and a fabric discharge end, the fabric feed unit pushes the fabric from the fabric supply end to the fabric discharge end, and the light reflecting unit is adjacent to the fabric supply end of the sewing area.

3. 2. The sewing machine according to claim 1, wherein the stitch pitch generated in the second sewing state is smaller than the stitch pitch generated in the first sewing state.

4. 2. The sewing machine according to claim 1, wherein the density of the stitches formed in the second sewing state is greater than the density of the stitches formed in the first sewing state.

5. 2. The sewing machine according to claim 1, wherein the light emitting / receiving unit is provided on the underside of the arm.

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