TWI826932B - Sensor-type foot press device for sewing machine - Google Patents

Abstract

A sensor-type foot press device for sewing machine includes a foot presser, an actuator, a control module and an elastic force application mechanism. The foot presser having a pressure rod and a presser foot. The actuator includes a rotating shaft and a rotating member. The control module having a sensor. The elastic force application mechanism include a slide. Wherein when the thickness of a cloth increases, the pressure rod will be lifted upwards, and the sensor will feed the signal of the pressure rod change to the control module, and the rotating shaft drive the rotating member to drive the slider upwards, thereby reducing the force exerted on the cloth by the presser foot; when the thickness of the cloth is reduced, the pressure bar will move downward, the sensor will feed the signal of the pressure rod change to the control module, the rotating shaft drive the rotating member to drive the slider down, thereby increasing the force exerted on the cloth by the presser foot.

Description

Sewing machine sensor-type presser foot device

The present invention relates to the technology of a sewing machine, and in particular, to a sensor-type presser foot device of a sewing machine.

Press, the presser foot device of the sewing machine mainly uses the elastic force of a compression spring to make the bottom surface of the presser foot press tightly against the fabric, and through the cloth feeding mechanism located under the presser foot, the transmission mechanism of the sewing machine and the needle bar mechanism. They cooperate with each other to sew and turn different pieces of cloth to complete finished products such as clothing or pants.

In the presser foot device of existing sewing machines, the thickness of the fabric changes randomly during the sewing process. When the thickness of the fabric increases, the force exerted by the compression spring on the fabric increases, thus causing friction between the presser foot and the fabric. The force and the friction between the feed teeth and the fabric change. After the friction changes, the sliding rate also changes. This will cause the thread pitch of the suture to be inconsistent, thus affecting the sewing quality and aesthetics of the finished product. .

In view of this, the inventor has devoted himself to research and applied academic theory to solve the above-mentioned problems in order to solve the above-mentioned deficiencies in the prior art, which has become the inventor's goal of improvement.

One object of the present invention is to provide a sensor-type presser foot device for a sewing machine that can automatically adjust accordingly through an actuating mechanism and a control module in response to changes in fabric thickness, thereby improving sewing quality.

In order to achieve the above object, the present invention provides a sensor-type presser foot device of a sewing machine, which is used for sewing a fabric. The sensor-type presser foot device includes a presser foot mechanism, an actuating mechanism, a control module and a An elastic force applying mechanism includes a presser foot and a presser foot connected to the presser bar. The presser bar is movably connected to the machine body; the actuating mechanism includes an actuator, a rotating shaft and a rotating shaft. The actuator is fixed on the machine body, the rotating shaft is pivotally connected to the machine body and driven by the actuator, and one end of the rotating member is sleeved on the rotating shaft; the control module is electrically connected to the actuating mechanism. , the control module includes a sensor, which is arranged corresponding to the pressure rod and used to sense changes in the displacement of the pressure rod; the elastic force applying mechanism includes a sleeve, a sliding member and a compression spring, The sleeve is fixed on the body, the sliding member is movably connected to the sleeve, the other end of the rotating component is connected to the sliding member, and the compression spring is configured between the sliding member and the pressing rod; When the thickness of the fabric increases, the pressing rod will be pushed upward. After the sensor feeds the signal of the pressing rod change to the control module, the rotating shaft will drive the rotating component to drive the sliding component upward. Move, thereby reducing the force exerted by the presser foot on the fabric; when the thickness of the fabric decreases, the pressure rod will move downward, and the sensor will feed the signal of the pressure rod change to the control module. , the rotating shaft will drive the rotating component to drive the sliding member to move downward, thereby increasing the force exerted by the presser foot on the cloth.

The invention also has the following effects: it has the advantages of simplified mechanical structure, compact size and easy installation.

1: Sensing presser foot device

10: Presser foot mechanism

11:pressure stick

111: Center hole

12: Presser foot

13: Tested part

20: Actuating mechanism

21: Actuator

22:Rotating axis

23: Rotating parts

24: Shaft sleeve

25:Gear assembly

251: Spur gear

252: Sector gear

26: Torsion spring

30:Control module

31: Sensor

40: Elastic force applying mechanism

41:Sleeve

42:Sliding parts

43:Compression spring

44: Pressure adjustment component

441: Set of firmware

442: Knob

443:Guide rod

45: Auxiliary compression spring

50: Presser foot lifting mechanism

51: Swing arm

52:Tie rod

53:Tightening member

531: Guide block

7: Sewing machine

70: Body

71:Arm

Figure 1 is an appearance view of the sensor-type presser foot device of the present invention combined with a sewing machine.

Figure 2 is an appearance view of the sensor-type presser foot device assembly of the present invention.

Figure 3 is a front view of the sensor-type presser foot device assembly of the present invention.

Figure 4 is a schematic diagram of the combination of the presser foot mechanism and the elastic force applying mechanism of the present invention.

Figure 5 is a cross-sectional view of the combination of the presser foot mechanism and the elastic force applying mechanism of the present invention.

Figure 6 is a diagram (1) of the use state of the sensor-type presser foot device of the present invention.

Figure 7 is a usage state diagram (2) of the sensor-type presser foot device of the present invention.

The detailed description and technical content of the present invention are described below with reference to the drawings. However, the attached drawings are only for reference and illustration and are not intended to limit the present invention.

Referring to Figures 1 to 5, the present invention provides a sensor-type presser foot device for a sewing machine. The sewing machine 7 includes a body 70. The body 70 includes a machine arm 71 and a base ( (not shown in the figure), various transmission mechanisms or devices (not shown in the figure) connected to each other are respectively provided inside the machine arm 71 and the base, and a sensor-type presser foot device 1 and a needle bar mechanism are provided on the front side of the machine arm 71 (not shown) and other related components.

The sensor-type presser foot device 1 of this embodiment mainly includes a presser foot mechanism 10, an actuating mechanism 20, a control module 30 and an elastic force applying mechanism 40.

The presser foot mechanism 10 mainly includes a presser bar 11 and a presser foot 12. The presser bar 11 is movably connected to the aforementioned machine arm 71, and the presser foot 12 is fixed at the end of the presser bar 11 exposed from the machine arm 71. Great When driven, the presser foot 11 can move up and down relative to the machine arm 71. The presser foot 12 operates in cooperation with the needle bar mechanism and the cloth feeding mechanism. There is a central hole 111 inside the presser bar 11.

In one embodiment, the presser foot mechanism 10 further includes a test piece 13 , which is sleeved on the end of the presser rod 11 away from the presser foot 12 and formed inside the aforementioned machine arm 71 .

The actuating mechanism 20 mainly includes an actuator 21, a rotating shaft 22 and a rotating component 23. The actuator 21 in this embodiment is a stepper motor, which is fixed on the aforementioned machine arm 71. The rotating shaft 22 pivots through a sleeve 24. Connected to the machine arm 71 , one end of the rotating component 23 is sleeved on the rotating shaft 22 .

In one embodiment, the actuating mechanism 20 further includes a gear assembly 25 and a torsion spring 26. The gear assembly 25 mainly includes a spur gear 251 and a sector gear 252. The spur gear 251 is connected to the actuator 21 and the sector gear 252 Then the rotating shaft 22 is connected, and the spur gear 251 and the sector gear 252 are meshed and driven with each other, so that the actuator 21 drives the rotating shaft 22 to rotate and drives the rotating component 23 to swing. The torsion spring 26 is sleeved on the rotating shaft 22 and formed on one side of the sleeve 24. The two extending arms of the torsion spring 26 are respectively abutted against the sector gear 252 and the machine arm 71, thereby keeping the spur gear 251 and the sector gear 252 in a meshed state. .

The control module 30 is electrically connected to the actuating mechanism 20, and mainly includes a sensor 31. The sensor 31 in this embodiment is fixed on the aforementioned machine arm 71 and is correspondingly formed directly above the aforementioned measured object 13. And used to sense the displacement change of the aforementioned pressure rod 11. In addition, the control module 30 also includes a control unit, a processing unit, a setting/operation unit and other related components (not shown) that are electrically connected to the aforementioned sensor 31 .

The elastic force applying mechanism 40 mainly includes a sleeve 41, a sliding member 42 and a compression spring 43. The sleeve 41 is fixed on the aforementioned machine arm 71, and the sliding member 42 is movably connected to the sleeve 41. The other end of the moving part 23 is connected to the sliding member 42 , and the compression spring 43 is arranged between the sliding member 42 and the pressing rod 11 .

In one embodiment, the elastic force applying mechanism 40 also includes a pressure adjustment component 44, which mainly includes a set of fasteners 441, a knob 442 and a guide rod 443. The set of fasteners 441 is sleeved above the sleeve 41, and the knob 442 and The sets of components 441 are screwed to each other, one end of the guide rod 443 passes through the knob 442, and the other end of the guide rod 443 passes through the compression spring 43 and then enters the central hole 111 of the pressure rod 11.

In one embodiment, the elastic force applying mechanism 40 further includes an auxiliary compression spring 45. The auxiliary compression spring 45 is accommodated in the central hole 111 of the pressure rod 11, and its two ends are respectively abutted against the guide rod 443 and the guide rod 443. on the bottom of the central hole 111.

The sensor-type presser foot device 1 of the present invention also includes a presser foot lifting mechanism 50, which mainly includes a swing arm 51, a pull rod 52 and a tightening member 53. One end of the swing arm 51 is sleeved on the aforementioned rotating shaft 22 and tightened. The tightening member 53 has a guide block 531. The tightening member 53 is sleeved with the pressure rod 11, and its guide block 531 is embedded in the guide groove (not shown) of the aforementioned machine arm 71, thereby limiting the pressure rod 11 to only be able to To perform linear movement in the up and down direction, the two ends of the pull rod 52 are connected to the other end of the swing arm 51 and the tightening member 53 respectively. During operation, the actuator 21 is used to drive the rotating shaft 22 to rotate, which will drive the swing arm 51 to produce a swing, and the tightening member 53 and the pressure rod 11 are pulled upward together through the pull rod 52 .

Please refer to Figure 5, Figure 6 and Figure 7 together. The sensor-type presser foot device of the present invention is applied to a piece of fabric. When the thickness of the fabric increases, the pressure rod 11 will be pushed upward. At this time, the compression spring 43 Being compressed causes its elastic force to increase. After the sensor 31 feeds the signal of the change in displacement of the upward lifting rod 11 to the control module 30, through the processing unit calculation and control unit operation of the control module 30, The actuator 21 will drive the spur gear 251 to drive the sector gear 252 to act. The rotating shaft 22 will be driven by the sector gear 252 to drive the rotating component 23 to drive the sliding member 42 to move upward. At this time, the compression spring 43 is released. The elastic force is reduced, thereby reducing the force exerted by the presser foot 12 on the fabric. On the contrary, when the thickness of the fabric decreases, the pressure rod 11 will move downward. At this time, the compression spring 43 is released and its elastic force decreases. The sensor 31 feeds back a signal of the change in the displacement of the downward movement of the pressure rod 11. After being given to the control module 30, the actuator 21 will drive the spur gear 251 to drive the sector gear 252 to produce reverse movement. The rotating shaft will be driven by the sector gear 252 to drive the rotating component 23 to drive the sliding member 42 to move downward. At this time, the spring 43 is compressed. Being compressed causes its elastic force to increase, thereby increasing the force exerted by the presser foot on the fabric.

To sum up, the sensor-type presser foot device of the sewing machine of the present invention can indeed achieve the expected purpose of use and solve the deficiencies of the conventional knowledge. Moreover, because it is extremely novel and progressive, it fully meets the requirements for application for an invention patent. According to the patent, If you file an application under the law, please review it carefully and grant the patent in this case to protect the rights of the inventor.

1: Sensing presser foot device

10: Presser foot mechanism

11:pressure stick

12: Presser foot

13: Tested part

20: Actuating mechanism

21: Actuator

22:Rotating axis

23: Rotating parts

24: Shaft sleeve

25:Gear assembly

251: Spur gear

252: Sector gear

26: Torsion spring

30:Control module

31: Sensor

40: Elastic force applying mechanism

41:Sleeve

42:Sliding parts

43:Compression spring

44: Pressure adjustment component

50: Presser foot lifting mechanism

51: Swing arm

52:Tie rod

53:Tightening member

Claims (10)

A sensor-type presser foot device of a sewing machine is used for sewing a piece of fabric. The sewing machine includes a machine body. The sensor-type presser foot device includes: a presser foot mechanism, including a pressure rod and a pressure rod connected to the pressure rod. A presser foot, the presser rod is movably connected to the machine body; an actuating mechanism includes an actuator, a rotating shaft and a rotating component, the actuator is fixed on the machine body, and the rotating shaft is pivotally connected to the machine body. The body is driven by the actuator, and one end of the rotating component is sleeved on the rotating shaft; a control module is electrically connected to the actuating mechanism, and the control module includes a sensor corresponding to the The pressure rod is arranged and used to sense changes in the displacement of the pressure rod; and an elastic force applying mechanism includes a sleeve, a sliding member and a compression spring. The sleeve is fixed on the body, and the sliding member is movable. The sleeve is connected to the sleeve, the other end of the rotating component is connected to the sliding member, and the compression spring is disposed between the sliding member and the pressing rod; when the thickness of the cloth increases, the pressing rod will be pushed upward. After the sensor feeds the signal of the pressure rod change to the control module, the rotating shaft will drive the rotating component to drive the sliding member to move upward, thereby reducing the force exerted by the presser foot on the fabric; When the thickness of the fabric decreases, the pressing rod will move downward. After the sensor feeds the signal of the pressing rod change to the control module, the rotating shaft will drive the rotating component to drive the sliding member to move downward. , thereby increasing the force exerted by the presser foot on the fabric. The sensor-type presser foot device of a sewing machine as described in claim 1, wherein the presser foot mechanism further includes a test piece, and the test piece is sleeved on an end of the pressure rod away from the presser foot, and the sensor located above the device under test. The sensor-type presser foot device of a sewing machine as claimed in claim 1, wherein the elastic force applying mechanism further includes a pressure adjustment component, and the pressure adjustment component is provided on the sleeve and the sliding member. The sensor-type presser foot device of a sewing machine as described in claim 3, wherein the pressure adjustment component includes a set of fasteners, a knob and a guide rod. The set of fasteners is sleeved on the sleeve, and the knob and the set of fasteners are They are screwed to each other, one end of the guide rod passes through the knob, and the other end of the guide rod passes through the compression spring and then passes through the pressure rod. The sensor-type presser foot device of a sewing machine as described in claim 4, wherein the elastic force applying mechanism further includes an auxiliary compression spring, the pressure rod has a center hole, and the auxiliary compression spring is accommodated in the center hole, and Both ends of the auxiliary compression spring are respectively abutted against the guide rod and the bottom surface of the central hole. The sensor-type presser foot device of a sewing machine as claimed in claim 1 further includes a presser foot lifting mechanism connected between the rotating shaft and the pressure rod. The sensor-type presser foot device of a sewing machine according to claim 6, wherein the presser foot lifting mechanism includes a swing arm, a pull rod and a tightening member. One end of the swing arm is sleeved on the rotating shaft, and the tightening member The pressure rod is sleeved, and the two ends of the pull rod are respectively connected to the other end of the swing arm and the tightening member. The sensor-type presser foot device of a sewing machine as claimed in claim 7, wherein the tightening member has a guide block, which is embedded in the body to limit the pressure rod to only linear movement in the up and down direction. . The sensor-type presser foot device of the sewing machine according to claim 1, wherein the actuating mechanism further includes a gear assembly, the gear assembly includes a spur gear and a sector gear meshed with the spur gear, and the spur gear system The actuator is connected, and the sector gear is connected to the rotating shaft. The sensor-type presser foot device of the sewing machine according to claim 9, wherein the actuating mechanism further includes a torsion spring, the torsion spring is sleeved on the rotating shaft, and the two ends of the torsion spring are respectively abutted against the sector gear and the body.

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