阅读说明：本技术 一种用于差动平缝机的拖布轮机构 (Mop wheel mechanism for differential lockstitch sewing machine ) 是由 王忠军 于 2020-06-07 设计创作，主要内容包括：本发明公开了一种用于差动平缝机的拖布轮机构,包括依次相连的叉形曲柄、第一转换曲柄、转换轴、第二转换曲柄、连杆、调节滑块杆、传动曲柄和拖布轮,拖布轮包括橡胶轮和中心轴,传动曲柄安装在中心轴上,转换轴与中心轴的平行设置,第一转换曲柄与第二转换曲柄分置在转换轴的两端,叉形曲柄与传动曲柄平行设置,叉形曲柄上设置有圆形夹口,圆形夹口上卡夹有提供动力的缝纫机动力轴；其优点在于：1叉形曲柄上设置有圆形夹口和叉口槽,圆形夹口上卡夹有提供动力的缝纫机动力轴,省去了皮带、齿轮、链条等转动结构,使得体积小巧,方便缝制布匹；叉口槽与缝纫机的压脚上牙相连,同步性好。(The invention discloses a cloth dragging wheel mechanism for a differential lockstitch sewing machine, which comprises a forked crank, a first conversion crank, a conversion shaft, a second conversion crank, a connecting rod, an adjusting slider rod, a transmission crank and a cloth dragging wheel which are sequentially connected, wherein the cloth dragging wheel comprises a rubber wheel and a central shaft; the advantages are that: 1, a circular clamping opening and a fork opening groove are arranged on the fork-shaped crank, and a sewing machine power shaft for providing power is clamped on the circular clamping opening, so that rotating structures such as a belt, a gear, a chain and the like are omitted, the size is small, and cloth sewing is convenient; the fork groove is connected with the upper teeth of the presser foot of the sewing machine, and the synchronism is good.)

1. A mop wheel mechanism for a differential lockstitch sewing machine is characterized in that: the cloth dragging wheel comprises a fork crank (01), a first conversion crank (02), a conversion shaft (03), a second conversion crank (04), a connecting rod (05), an adjusting slider rod (06), a transmission crank (07) and a cloth dragging wheel (08) which are sequentially connected, wherein the cloth dragging wheel comprises a rubber wheel (8 a) and a central shaft (8 b), the transmission crank is installed on the central shaft, the conversion shaft and the central shaft are arranged in parallel, the first conversion crank and the second conversion crank are respectively arranged at two ends of the conversion shaft, the fork crank and the transmission crank are arranged in parallel, and a circular clamping opening (1 a) for a sewing machine power shaft (09) is arranged on the fork crank; the center shaft is provided with a dragging wheel frame (10), the dragging wheel frame is fixed on a shell of the sewing machine through a sliding rail structure (11), an arched lifting frame (12) is arranged on the dragging wheel frame, an air cylinder (13) is installed above the lifting frame, an air cylinder shaft (14) of the air cylinder penetrates through the lifting frame, a pressure spring (15) is sleeved on the air cylinder shaft, the pressure spring is arranged between the lifting frame and the dragging wheel frame, and lifting force is transmitted between the pressure spring and the air cylinder shaft through an adjusting nut (16).

2. A mop wheel mechanism for a differential lockstitch machine according to claim 1, characterized in that: the fork-shaped crank is further provided with a fork opening groove (1 b), the circular clamping opening faces upwards, the fork opening groove faces downwards, and the fork opening groove is connected with the upper teeth of the presser foot of the sewing machine.

3. A mop wheel mechanism for a differential lockstitch machine according to claim 2, characterized in that: be provided with round hole (7 a), rectangular hole (7 b) and screw hole (7 c) on the transmission crank, be provided with one-way bearing (17) on the round hole, one-way bearing cover is established on the center pin, the one end of adjusting the slider pole is provided with slider (6 a), the slider sets up on the rectangular hole, be provided with adjusting screw (18) on the screw hole, adjusting screw's one end is provided with knob (19), and the other end is installed on the slider.

Technical Field

The invention relates to an auxiliary mechanism of a differential lockstitch sewing machine; in particular to a mop wheel mechanism for a differential lockstitch sewing machine.

Background

Sewing common clothes only by matching the upper teeth of the presser foot with the lower teeth of the presser foot; however, when longer or heavier cloth such as curtain cloth is sewed, a cloth dragging wheel structure is needed to help drag the cloth.

The mop wheel is a common structure, and the common mop wheel is driven by elements such as a transmission belt, a gear, pneumatic elements and the like; the developed mop wheel has the advantages of complex structure shape, large volume and poor synchronism.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a mop wheel mechanism for a differential lockstitch sewing machine, which has small volume and synchronism.

In order to solve the technical problem, the invention is solved by the following technical scheme: a cloth dragging wheel mechanism for a differential lockstitch sewing machine comprises a forked crank, a first conversion crank, a conversion shaft, a second conversion crank, a connecting rod, an adjusting slider rod, a transmission crank and a cloth dragging wheel which are sequentially connected, wherein the cloth dragging wheel comprises a rubber wheel and a central shaft, the transmission crank is installed on the central shaft, the conversion shaft and the central shaft are arranged in parallel, the first conversion crank and the second conversion crank are respectively arranged at two ends of the conversion shaft, the forked crank and the transmission crank are arranged in parallel, a circular clamping opening is formed in the forked crank, and a sewing machine power shaft for providing power is clamped on the circular clamping opening; the center shaft is provided with a dragging wheel frame, the dragging wheel frame is fixed on a shell of the sewing machine through a sliding rail structure, an arched lifting frame is arranged on the dragging wheel frame, a cylinder is installed above the lifting frame, a cylinder shaft of the cylinder penetrates through the lifting frame, a pressure spring is sleeved on the cylinder shaft and arranged between the lifting frame and the dragging wheel frame, and lifting force is transmitted between the pressure spring and the cylinder shaft through an adjusting nut.

The fork-shaped crank is further provided with a fork opening groove, the circular clamping opening faces upwards, the fork opening groove faces downwards, and the fork opening groove is connected with the upper teeth of the presser foot of the sewing machine.

The transmission crank is provided with a round hole, a rectangular hole and a threaded hole, the round hole is provided with an one-way bearing, the one-way bearing sleeve is arranged on the central shaft, one end of the adjusting slider rod is provided with a slider, the slider is arranged on the rectangular hole, the threaded hole is provided with an adjusting screw rod, one end of the adjusting screw rod is provided with a knob, and the other end of the adjusting screw rod is arranged on the slider.

Compared with the prior art, the invention has the following beneficial effects: 1, a circular clamping opening and a fork opening groove are arranged on the fork-shaped crank, and a sewing machine power shaft for providing power is clamped on the circular clamping opening, so that rotating structures such as a belt, a gear, a chain and the like are omitted, the size is small, and cloth sewing is convenient; the fork groove is connected with the upper teeth of the presser foot of the sewing machine, so that the synchronism is good; 2, a plurality of crank connecting rod structures are adopted, so that the whole structure is compact; the rubber wheel can rotate through the transmission crank, the rubber wheel can be lifted through the air cylinder shaft and the pressure spring, the vertical lifting direction is restrained through the sliding rail structure, and the front position and the rear position of the rubber wheel are adjusted through the knob, the adjusting screw and the sliding block.

Drawings

Fig. 1 is a front perspective view of the first embodiment of the present invention.

Fig. 2 is a front perspective view of the second embodiment of the present invention.

Fig. 3 is a front view of the present invention.

Fig. 4 is a left side view of the present invention.

Fig. 5 is an inverted perspective view of the present invention.

Fig. 6 is an exploded view of a part of the present invention.

Fig. 7 is a schematic view of the installation of the present invention.

Detailed Description

The invention is described in further detail below with reference to the following detailed description and accompanying drawings: as shown in fig. 1-7, the icons are noted as follows:

the device comprises a fork crank 01, a circular clamping opening 1a, a fork opening groove 1b, a first conversion crank 02, a conversion shaft 03, a second conversion crank 04, a connecting rod 05, an adjusting slider rod 06, a slider 6a, a transmission crank 07, a round hole 7a, a rectangular hole 7b, a threaded hole 7c, a cloth dragging wheel 08, a rubber wheel 8a, a central shaft 8b, a sewing machine power shaft 09, a dragging wheel frame 10, a sliding rail structure 11, a lifting frame 12, a sliding rail mounting part 12a, an air cylinder 13, an air cylinder shaft 14, a pressure spring 15, an adjusting nut 16, a one-way bearing 17, an adjusting screw 18, a knob 19, a sewing machine 20, an air cylinder mounting plate 21 and a housing 22.

A cloth dragging wheel mechanism for a differential lockstitch sewing machine comprises a fork-shaped crank 01, a first conversion crank 02, a conversion shaft 03, a second conversion crank 04, a connecting rod 05, an adjusting slider rod 06, a transmission crank 07 and a cloth dragging wheel 08 which are connected in sequence, wherein the cloth dragging wheel comprises a rubber wheel 8a and a central shaft 8b, the transmission crank is arranged on the central shaft, the conversion shaft and the central shaft are arranged in parallel, the first conversion crank and the second conversion crank are respectively arranged at two ends of the conversion shaft, the fork-shaped crank and the transmission crank are arranged in parallel, a circular clamping opening 1a is formed in the fork-shaped crank, and a sewing machine power shaft 09 for providing power is clamped on the circular clamping opening; be provided with on the center pin and drag wheel carrier 10, the tow wheel carrier passes through sliding rail structure 11 to be fixed on sewing machine 20's casing, be provided with arcuate hoisting frame 12 on the tow wheel carrier, cylinder 13 is installed to the top of hoisting frame, cylinder shaft 14 of cylinder passes the hoisting frame, the epaxial cover of cylinder is equipped with pressure spring 15, the pressure spring setting is between hoisting frame and tow wheel carrier, it is fixed through adjusting nut 16 between pressure spring and the cylinder shaft, the pressure spring provides the holding down force of rubber tyer, the cylinder shaft makes the hoisting frame, tow wheel carrier and the whole rising of mop tyer, adjusting nut is the moment connecting piece.

The fork crank is also provided with a fork opening groove 1b, the circular clamping opening faces upwards, the fork opening groove faces downwards, and the fork opening groove is connected with the upper teeth of the presser foot of the sewing machine.

The transmission crank is provided with a round hole 7a, a rectangular hole 7b and a threaded hole 7c, the round hole is provided with a one-way bearing 17, the one-way bearing sleeve is arranged on the central shaft, one end of an adjusting slider rod is provided with a slider 6a, the slider is arranged on the rectangular hole, the threaded hole is provided with an adjusting screw 18, one end of the adjusting screw is provided with a knob 19, and the other end of the adjusting screw is arranged on the slider.

In order to facilitate installation and clean structure, the lifting frame is made of sheet metal and is provided with a bent sliding rail installation part 12 a; a cylinder mounting plate 21 for fixing the cylinder; and a cover 22 for covering the first and second switching cranks, one end of the switching shaft extending out of the cover, the cover being mounted on the cylinder mounting plate.

Minor modifications based on equivalent design principles are within the scope of protection of the present application.