阅读说明：本技术 一种缝纫机送料牙高度调节机构 (Feeding tooth height adjusting mechanism of sewing machine ) 是由 沈剑青 管建平 洪志敏 林晓晓 于 2019-02-26 设计创作，主要内容包括：本发明提供了一种缝纫机送料牙高度调节机构,包括抬牙轴、抬牙叉形曲柄、牙架和固定在牙架上的送料牙,所述牙架的一端设有抬牙滑块,所述抬牙滑块与抬牙叉形曲柄的叉槽滑动连接,所述牙架的一端与抬牙滑块之间通过偏心轴相连接；所述牙架上安装有驱动装置,所述驱动装置与偏心轴传动连接并可带动所述偏心轴转动。综上所述,本发明的有益之处在于,通过偏心轴与牙架和抬牙滑块的设置,使得送料牙高度灵活可调,只使用一台机器就可以缝纫厚料和薄料,避免了反复更换不同机型的麻烦,可以为用户提供更好的操作体验。(The invention provides a feeding tooth height adjusting mechanism of a sewing machine, which comprises a lifting tooth shaft, a lifting tooth fork-shaped crank, a tooth frame and feeding teeth fixed on the tooth frame, wherein a lifting tooth sliding block is arranged at one end of the tooth frame, the lifting tooth sliding block is in sliding connection with a fork groove of the lifting tooth fork-shaped crank, and one end of the tooth frame is connected with the lifting tooth sliding block through an eccentric shaft; the tooth rack is provided with a driving device, and the driving device is in transmission connection with the eccentric shaft and can drive the eccentric shaft to rotate. In conclusion, the feed dog has the advantages that the eccentric shaft, the tooth rack and the tooth lifting slide block are arranged, so that the height of the feed dog is flexible and adjustable, thick materials and thin materials can be sewn by using one machine, the trouble of repeatedly replacing different machine types is avoided, and better operation experience can be provided for users.)

1. A feeding tooth height adjusting mechanism of a sewing machine comprises a feeding tooth shaft (9), a feeding tooth fork-shaped crank (10), a tooth rack (5) and feeding teeth (6) fixed on the tooth rack (5), wherein one end of the tooth rack (5) is provided with a feeding tooth slider (51), the feeding tooth slider (51) is in sliding connection with a fork groove of the feeding tooth fork-shaped crank (10), and the feeding tooth height adjusting mechanism is characterized in that one end of the tooth rack (5) is connected with the feeding tooth slider (51) through an eccentric shaft (55); the tooth rack (5) is provided with a driving device (7), and the driving device (7) is in transmission connection with the eccentric shaft (55) and can drive the eccentric shaft (55) to rotate.

2. The feed dog height adjustment mechanism according to claim 1, characterized in that the eccentric shaft (55) comprises a first shaft section (551) and a second shaft section (552) connected eccentrically, the first shaft section (551) being arranged in a shaft hole of the tooth rack (5) and the second shaft section (552) being arranged in a shaft hole of the feed dog slider (51).

3. Feed dog height adjustment mechanism according to claim 1, characterized in that the drive means (7) is connected to the eccentric shaft (55) via a transmission (4).

4. Feed dog height adjustment mechanism according to claim 3, characterized in that the drive means (7) is a rotary drive.

5. The feed dog height adjustment mechanism according to claim 4, characterised in that the drive means (7) is a rotary cylinder or a stepper motor.

6. The feed dog height adjustment mechanism according to claim 4, characterized in that the transmission mechanism (4) comprises a first connecting plate (41), a second connecting plate (42) and an eccentric shaft connecting handle (43), one end of the first connecting plate (41) is fixedly connected with an output shaft (72) of a rotary driving device, the other end is hinged with one end of the second connecting plate (42), and the other end of the second connecting plate (42) is hinged with one end of the eccentric shaft connecting handle (43); the other end of the eccentric shaft connecting handle (43) is fixedly connected with the eccentric shaft (55).

7. The feed dog height adjustment mechanism according to claim 1, further comprising a bracket (71) mounted on the dental articulator (5), the drive means (7) being mounted on the bracket (71).

8. Feed dog height adjustment mechanism according to claim 3, characterized in that the drive means (7) is a linear drive.

9. Feed dog height adjustment mechanism according to claim 8, characterized in that the transmission mechanism (4) comprises a first connecting plate (41) and an eccentric shaft connection handle (43), the first connecting plate (41) being rotatably connected at one end to an output shaft (72) of a linear drive and at the other end to the eccentric shaft connection handle (43); the eccentric shaft connecting handle (43) is fixedly connected with the eccentric shaft (55).

10. The feed dog height adjusting mechanism according to claim 1, further comprising a thickness detection device for detecting the thickness of the cloth, and a controller respectively connected to the thickness detection device and the driving device (7), wherein the controller controls the driving device (7) to operate according to the thickness of the cloth detected by the thickness detection device.

Technical Field

The invention relates to the technical field of sewing machines, in particular to a feeding structure of a sewing machine.

Background

The sewing machine is at the sewing cloth in-process, because the cloth kind is different, and thickness is also different, and need set up different pay-off tooth height at the in-process of transporting different thickness cloth, and the pay-off tooth that transports the thick material surpasss the pay-off tooth that transports the thin material that highly needs be higher than, thereby can provide stronger pay-off ability. For example, a flat sewing machine is divided into two types for thin materials and thick materials, and one of the main differences of the two types is that the heights of exposed needle plates of feeding teeth are different.

Because the height of the feeding teeth of the existing machine is fixed and can not be adjusted by self according to the thickness of cloth, two or more sewing machines are usually needed to operate in the common sewing process, and the use is very inconvenient.

Disclosure of Invention

In order to overcome the defects, the invention provides a feeding tooth height adjusting mechanism of a sewing machine, which enables the height of the feeding tooth to be self-adjusted according to the thickness of cloth.

The invention provides a feeding tooth height adjusting mechanism of a sewing machine, which comprises a lifting tooth shaft, a lifting tooth fork-shaped crank, a tooth frame and feeding teeth fixed on the tooth frame, wherein a lifting tooth sliding block is arranged at one end of the tooth frame, the lifting tooth sliding block is in sliding connection with a fork groove of the lifting tooth fork-shaped crank, and one end of the tooth frame is connected with the lifting tooth sliding block through an eccentric shaft; the tooth rack is provided with a driving device, and the driving device is in transmission connection with the eccentric shaft and can drive the eccentric shaft to rotate.

Preferably, the eccentric shaft comprises a first shaft section and a second shaft section which are eccentrically connected, the first shaft section is arranged in a shaft hole of the tooth rack, and the second shaft section is arranged in a shaft hole of the tooth lifting slide block.

Preferably, the drive device is connected to the eccentric shaft by a transmission mechanism.

Preferably, the drive means is a rotary drive means.

Preferably, the driving device is a rotary cylinder or a stepping motor.

Preferably, the transmission mechanism comprises a first connecting plate, a second connecting plate and an eccentric shaft connecting handle, one end of the first connecting plate is fixedly connected with an output shaft of the rotary driving device, and the other end of the first connecting plate is rotatably connected with the eccentric shaft connecting handle through the second connecting plate; the eccentric shaft connecting handle is fixedly connected with the eccentric shaft.

Preferably, the tooth rack further comprises a bracket mounted on the tooth rack, and the driving device is mounted on the bracket.

Preferably, the drive means is a linear drive means.

Preferably, the transmission mechanism comprises a first connecting plate and an eccentric shaft connecting handle, one end of the first connecting plate is rotatably connected with an output shaft of the linear driving device, and the other end of the first connecting plate is rotatably connected with the eccentric shaft connecting handle; the eccentric shaft connecting handle is fixedly connected with the eccentric shaft.

Preferably, the cloth thickness detection device is used for detecting the thickness of the cloth, and the controller is respectively connected with the thickness detection device and the driving device, and the controller controls the driving device to act according to the cloth thickness detected by the thickness detection device.

The feed dog mechanism has the beneficial effects that the eccentric shaft, the tooth rack and the tooth lifting slide block are arranged, so that the height of the feed dog is flexible and adjustable, thick materials and thin materials can be sewn by using one machine, the trouble of repeatedly replacing different machine types is avoided, and better operation experience can be provided for users.

Drawings

FIG. 1 is a schematic view of a feed dog height adjustment mechanism of a sewing machine according to the present invention;

FIG. 2 is an enlarged view of circle A of FIG. 1;

FIG. 3 is a schematic connection diagram of the eccentric shaft, the tooth rack and the tooth lifting slide block;

FIG. 4 is a schematic view showing the connection of the rotary drive unit, the transmission mechanism and the dental articulator in accordance with one embodiment;

FIG. 5 is a schematic view showing the connection of the linear driving device, the transmission mechanism and the dental articulator in the second embodiment;

FIG. 6 is a perspective view of the eccentric shaft;

fig. 7 is a schematic diagram of the eccentric shaft driving the tooth rack and the tooth lifting slide block to move.

Element number description:

1 dental articulator pin

2 dental articulator base

3 screw

4 transmission mechanism

41 first connection plate

42 second connecting plate

43 eccentric shaft connecting handle

431 connecting part

5 dental articulator

51 lifting tooth slider

52 shim

53 gasket

54 circlip

55 eccentric shaft

551 first shaft segment

552 second shaft section

553 clamping grooves

6 feeding tooth

7 drive device

71 support

72 output shaft

8 feeding shaft

9 lifting tooth shaft

10 lifting teeth fork shaped crank

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1 and 2, the existing sewing machine includes a feeding shaft 8, a feed lifting shaft 9, a feed lifting fork-shaped crank 10, a feed rack 5, and a feeding tooth 6 fixed on the feed rack 5, wherein a rack base 2 is fixed on the feeding shaft 8 through a screw 3, a rack pin 1 is fixed on the rack base 2, one end of the rack 5 is hinged with the rack base 2 through the rack pin 1, the other end is provided with a feed lifting slider 51, and the feed lifting slider 51 is connected with a fork slot of the feed lifting fork-shaped crank 10 in a sliding manner. In order to realize that thick materials and thin materials can be sewn on one sewing machine, the invention provides a feeding tooth height adjusting mechanism of the sewing machine, as shown in figures 2 and 3, wherein a tooth rack 5 is connected with a tooth lifting slider 51 through an eccentric shaft 55, a driving device 7 is also arranged on the tooth rack 5, and the driving device 7 is in transmission connection with the eccentric shaft 55 and can drive the eccentric shaft 55 to rotate. When the cloth with different thicknesses needs to be sewn, the height of the feeding tooth can be adjusted according to the thickness of the cloth. The height of the feeding tooth can be adjusted through setting of a human-computer interface, and the height of the feeding tooth can be adaptively adjusted through automatic detection of cloth thickness. When the height of the feeding tooth is adjusted, the feeding mechanism stops working, the feed lifting tooth shaft 9 and the feed lifting tooth fork-shaped crank 10 fixed on the feed lifting tooth shaft 9 keep still, and when the driving device 7 drives the eccentric shaft 55 to rotate, the drive tooth rack 5 is driven to move up and down.

Specifically, as shown in fig. 2, 6 and 7, the eccentric shaft 55 includes a first shaft segment 551 and a second shaft segment 552 which are eccentrically connected, the first shaft segment 551 is disposed in the shaft hole of the dental articulator 5, the second shaft segment 552 is disposed in the shaft hole of the tooth lifting slider 51, and the first shaft segment 551 has a larger diameter than the second shaft segment 552. The end of the second shaft section 552 is provided with a slot 553, and the clamp spring 54 can be clamped in the slot 553. During installation, the second shaft section 552 sequentially penetrates through the gasket 52, the tooth lifting slide block 51 and the gasket 53, the end parts of the second shaft section are fixed by the clamp spring 54, and the gasket 52, the gasket 53 and the clamp spring 54 tightly clamp the tooth lifting slide block 51 and prevent the eccentric shaft 55 from shifting left and right in the shaft hole of the tooth lifting slide block 51.

As shown in fig. 2 and 3, when the eccentric shaft 55 rotates, the feed dog slider 51 is driven to slide a small distance along the fork slot of the feed dog fork 10, but since the feed dog fork 10 is stationary, the feed dog slider 51 is restrained by the feed dog fork 10 from moving in the height direction. As shown in fig. 7, when the eccentric shaft rotates, the center of the second shaft segment 552 engaged with the feed block is constrained in the fork groove of the feed fork crank 10, and changes to 552' after rotating, which can be seen as basically not moving up and down; the center of the first shaft segment 551 matched with the tooth frame 5 moves up and down and changes into 551' after rotating, so that the feeding tooth 6 is driven to move up and down, and the height adjustment of the feeding tooth 6 is realized.

In a preferred embodiment of the present invention, the present invention further comprises a thickness detection device for detecting the thickness of the fabric, and a controller respectively connected to the thickness detection device and the driving device 7, wherein the controller controls the driving device 7 to operate according to the thickness of the fabric detected by the thickness detection device, so as to realize the adaptive adjustment of the feeding teeth 6 relative to the thickness of the fabric. The thickness detection device may be an infrared sensor, an ultrasonic sensor, a hall sensor, a magnet, or other known detection devices. For example, CN201610362993.6 discloses a cloth thickness detecting device for sewing machine.

As shown in fig. 2, 4 and 5, the drive means 7 is preferably mounted on a bracket 71, the bracket 71 being fixedly mounted on the dental articulator 5. The drive device 7 may be a linear drive device or a rotary drive device. Specifically, the driving device 7 is connected to the eccentric shaft 55 through the transmission mechanism 4 and drives the eccentric shaft 55 to rotate. Two specific examples of the invention are provided below: