WO2016106985A1 - Upper feed apparatus for sewing machine - Google Patents

Abstract

An upper feed apparatus for a sewing machine, comprising a stepper motor (1), a transmission mechanism (2) connected to an output shaft of the stepper motor, a transmission shaft assembly (5) connected to the transmission mechanism by means of a universal joint (4), and a roller press assembly (3) detachably connected to the transmission shaft assembly, the output shaft of the stepper motor (1) being connected to the transmission shaft assembly (5) by means of the universal joint (4). Compared to the prior art, during the replacement of a roller press assembly, the present upper feed apparatus for a sewing machine does not require the removal of the motor and the transmission mechanism. Only a press roller needs to be pulled to remove the roller press assembly. Additionally, the roller press assembly and the transmission shaft assembly are snapped together, thereby facilitating more convenient installation and removal.

Description

 Sewing machine feeding device

Technical field

The invention relates to a feeding device for a sewing machine, in particular to a feeding device with a pressing wheel.

Background technique

The existing sewing machine feeding device is mounted on the sewing machine head. The upper feeding device comprises a stepping motor, a transmission mechanism connected to the output shaft of the stepping motor, and a roller presser foot assembly directly connected to the transmission mechanism. The stepping motor drives the pressing wheel to rotate by the transmission mechanism and the bevel gears in the roller presser foot assembly and the bevel gear mechanism on the pressing wheel. In normal production, due to the different products processed by the sewing machine, it is necessary to use different sizes of the pressure roller, so the roller presser foot assembly needs to be replaced frequently, and the connection structure of the presser foot assembly in the prior art makes the roller presser foot assembly When replacing, the entire presser foot assembly including the stepping motor and the transmission mechanism needs to be removed to be replaced, which is very inconvenient and affects production efficiency.

Summary of the invention

In order to solve the above problems, an object of the present invention is to provide a feeding device for a sewing machine which is convenient for replacing a press wheel.

In order to achieve the above object, the technical solution adopted by the present invention is: a sewing machine feeding device comprising a presser foot assembly mounted on a sewing machine head, the presser foot assembly comprising a stepping motor connected to an output shaft of the stepping motor The transmission mechanism, the transmission shaft group connected to the transmission mechanism through the universal joint, and the roller presser foot assembly connected to the transmission shaft group detachably, the output shaft of the stepping motor and the transmission shaft group are connected by a universal joint. The feeding device of the sewing machine of the invention is improved on the basis of the feeding device of the existing sewing machine, so that it has at least two working states, and when it is in the first working state, the other end of the transmission shaft set is close to the sewing machine The head, when the feeding device of the sewing machine is in the second working state, the other end of the transmission shaft set is away from the sewing machine head. The feeding device on the sewing machine is in the first working state during normal production. When the roller presser foot assembly needs to be replaced, the drive shaft group is pulled, and the transmission shaft group is rotated by the universal joint, so that the roller presser foot assembly is away from the sewing machine head, and the roller foot assembly can be disassembled. Replace the lower roller presser foot assembly.

In a more preferred embodiment, the transmission mechanism includes a driving gear coaxially coupled to the output shaft of the stepping motor, a driven gear meshing with the driving gear, a rotating shaft of the driven gear, and a transmission shaft set passing through the universal joint Connected. By adopting this scheme, the gear ratio can be changed to lower the output speed.

In a more preferred embodiment, both the drive gear and the driven gear are helical gears. By adopting the scheme, the transmission direction is changed, the space occupied by the presser foot assembly in a single direction can be reduced, and the installation of the presser foot assembly on the sewing machine head can be facilitated.

In a more preferred embodiment, the output shaft of the stepper motor is disposed in a horizontal direction, and the axis of the drive shaft set is disposed in a vertical direction. The solution can adopt the gear mechanism of the above transmission mechanism and the helical gear of the driving gear and the driven gear, or the worm gear mechanism can be realized by the transmission mechanism, and the space occupied by the presser foot assembly in the vertical direction is reduced. It facilitates the installation of the presser foot assembly on the sewing machine head.

In a more preferred embodiment, the roller presser foot assembly includes a worm that is releasably coupled to the drive shaft set, a worm gear that meshes with the worm, and a nip wheel that is coaxially coupled to the worm gear.

In a more preferred embodiment, the roller presser foot assembly is detachably engaged with the drive shaft set. By adopting this scheme, the removal and installation of the roller presser foot assembly is more convenient.

In a more preferred embodiment, the transmission shaft set includes a first transmission shaft connected to the transmission mechanism through the universal joint, one end and the first transmission shaft are axially slidably coupled to the other end and the roller presser foot. The assembly can be disconnected from the grounded second drive shaft. By adopting this scheme, the transmission shaft set is retractable in the axial direction, so that the height of the transmission shaft group can be adjusted to adapt to different products or different parts of the same product.

In a more preferred embodiment, the other end of the second drive shaft has a bayonet that is releasably engaged with the roller presser foot assembly. By adopting this scheme, the removal and installation of the roller presser foot assembly is more convenient.

Due to the above technical solution, the feeding device of the sewing machine of the present invention does not need to be disassembled together with the motor and the transmission mechanism when replacing the roller presser foot assembly, and only needs to pull the transmission shaft set and remove the roller presser foot assembly. That is, the roller presser foot assembly and the drive shaft set are connected by means of a snap connection, which makes the disassembly and assembly more convenient.

DRAWINGS

1 is a schematic structural view of a presser foot assembly in a feeding device of a sewing machine according to the present invention;

Figure 2 is a cross-sectional structural view showing the presser foot assembly of the feeding device on the sewing machine of the present invention;

Figure 3 is a side elevational view showing the presser foot assembly of the feeding device of the sewing machine of the present invention.

The figures are:

1, stepper motor; 2, transmission mechanism; 21, gear box; 22, passive gear; 3, roller presser foot assembly; 31, press wheel; 4, universal joint; 5, drive shaft set; Drive shaft; 52, second drive shaft; 53, bayonet.

detailed description

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, in which the advantages and features of the invention can be more readily understood by those skilled in the art.

As can be seen from the structural diagrams of Figures 1 through 3, the present embodiment provides a sewing machine feed device that includes a presser foot assembly mounted on a sewing machine head (not shown in the drawings).

The presser foot assembly includes a stepping motor 1, a transmission mechanism 2 connected to the output shaft of the stepping motor 1, a transmission shaft group 5 whose one end portion is connected to the transmission mechanism 2 through the universal joint 4, and another with the transmission shaft group 5 The roller presser foot assembly 3, which is detachably connected to one end, and the output shaft of the stepping motor 1 are connected to the drive shaft group 5 via a universal joint 4. The feeding device on the sewing machine has at least two working states. When in the first working state, the other end of the driving shaft set 5 is close to the sewing machine head, and when the feeding device on the sewing machine is in the second working state, the other of the driving shaft group 5 One end is away from the sewing machine head. The feeding device on the sewing machine is in the first working state during normal production, and the stepping motor 1 drives the transmission shaft group 5 to rotate axially around the transmission shaft group 5 through the transmission mechanism 2, and when the roller pressing foot assembly 3 needs to be replaced, the driving is performed. The drive shaft set 5, the drive shaft set 5 is rotated by the universal joint 4, and the roller presser foot assembly 3 is moved away from the sewing machine head, and the roller presser foot assembly 3 can be removed for replacement.

In a more preferred embodiment, the output shaft of the stepping motor 1 is disposed in the horizontal direction, and the axis line of the transmission shaft group 5 is disposed in the vertical direction. This reduces the space occupied by the presser foot assembly in the vertical direction and facilitates the mounting of the presser foot assembly on the sewing machine head. The preferred embodiment is implemented by the transmission mechanism 2. In the embodiment shown in FIG. 2, the transmission mechanism 2 includes a driving gear (not shown in the drawing) coaxially connected to the output shaft of the stepping motor 1, The driven gear 22 meshed with the driving gear, the rotating shaft of the driven gear 22 and the transmission shaft group 5 are connected by a universal joint 4, and the driving gear and the driven gear 22 are both helical gears. The drive gear and the driven gear 22 are disposed within the gear case 21. As shown in FIG. 3, the stepping motor 1 is fixedly coupled to the gear case 21. This solution can change the transmission ratio, reduce the output speed, and change the transmission direction. The solution can also be realized by the transmission mechanism 2 using a worm gear mechanism.

As shown in FIG. 2, the transmission shaft set 5 includes a first transmission shaft 51 connected to the transmission mechanism 2 through the universal joint 4, one end and the first transmission shaft 51 are slidably coupled along the axial direction thereof, and the other end is coupled to the roller. The foot assembly 3 can be disengaged from the second drive shaft 52 that is coupled to the ground. Thus, the drive shaft set 5 is telescopic in the axial direction so that the height of the drive shaft set 5 can be adjusted to accommodate different products or different parts of the same product. The first transmission shaft 51 and the second transmission shaft 52 in this embodiment are splined.

The roller presser foot assembly 3 and the drive shaft set 5 are detachably engaged, so that the roller presser foot assembly is more convenient to be disassembled and installed. In the present embodiment, the other end of the second transmission shaft 52 has a bayonet 53 that is detachably engaged with the roller presser foot assembly 3.

The roller presser foot assembly 3 includes a worm (not shown in the drawings) detachably coupled to the drive shaft set 5, a worm gear (not shown in the drawing) that meshes with the worm, and a press material coaxially coupled to the worm wheel. Wheel 31. One end of the worm has a catching portion that is detachably engaged with the above-described bayonet 53. The worm gear assembly in the roller presser foot assembly 3 in this embodiment can also be replaced with a helical gear set.

The feeding device of the sewing machine of the invention does not need to be disassembled together with the motor and the transmission mechanism when replacing the roller presser foot assembly, only need to pull the transmission shaft group 5, remove the roller presser foot assembly, and the roller presser foot assembly and the drive shaft Group 5 adopts the connection mode of the card connection, which makes the disassembly and assembly more convenient.

The above embodiments are merely illustrative of the technical concept and the features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the present invention and to implement the present invention, and the scope of the present invention is not limited thereto. Equivalent variations or modifications made in accordance with the spirit of the invention are intended to be included within the scope of the invention.

Claims (9)

 1. A sewing machine feeding device comprising a presser foot assembly mounted on a sewing machine head, characterized in that: the presser foot assembly comprises a stepping motor (1), and an output shaft of the stepping motor (1) a connected transmission mechanism (2), a transmission shaft group (5) whose one end is connected to the transmission mechanism (2) through the universal joint (4), and the other end portion of the transmission shaft group (5) The output shaft of the stepping motor (1) and the transmission shaft group (5) are connected by a universal joint (4), away from the ground roller foot press assembly (3). 2. A sewing machine feeding device according to claim 1, characterized in that it has at least two operating states, and when it is in the first working state, the other end of said transmission shaft set (5) is close to said The sewing machine head, when the feeding device of the sewing machine is in the second working state, the other end of the transmission shaft set (5) is away from the sewing machine head. 3. The sewing machine upper feeding device according to claim 1, wherein said transmission mechanism (2) comprises a driving gear coaxially coupled with an output shaft of the stepping motor (1), and meshing with said driving gear A driven gear (22), the rotating shaft of the driven gear (22) is connected to the transmission shaft set (5) through the universal joint (4). 4. The sewing machine upper feeding device according to claim 3, wherein said driving gear and said driven gear (22) are both helical gears. 5. The upper feeding device for sewing machine according to claim 1 or 4, characterized in that the output shaft of the stepping motor (1) is arranged in a horizontal direction, and the axis of the transmission shaft group (5) is vertical Set in the straight direction. 6. The sewing machine upper feeding device according to claim 1, wherein said roller presser foot assembly (3) includes a worm that is detachably coupled to said transmission shaft set (5), and meshes with said worm a worm wheel, a pressure wheel (31) coaxially connected to the worm wheel. 7. The sewing machine upper feeding device according to claim 1, characterized in that the roller presser foot assembly (3) is detachably engaged with the drive shaft set (5). 8. The sewing machine upper feeding device according to claim 1, wherein said transmission shaft set (5) comprises a first transmission shaft (51) connected to the transmission mechanism (2) via a universal joint (4). One end is slidably coupled to the first transmission shaft (51) along its axial direction and the second transmission shaft (6) is detachably connected to the roller presser foot assembly (3) at the other end. 9. The sewing machine upper feeding device according to claim 8, wherein the other end of the second transmission shaft (6) has a bayonet that is detachably engaged with the roller presser foot assembly (3) ( 53).