CN106676765A - Synchronous feeding device and sewing machine - Google Patents

Abstract

The invention belongs to the technical field of sewing equipment, and particularly refers to a synchronous feeding device and a sewing machine; it includes a rear tug wheel arranged on the rear end of the presser foot, the rear tug wheel is arranged on a driving rod, and the rear tug wheel rotates in one direction around the driving rod to drive One end of the rod is connected to one end of the tugboat frame, and the other end is provided with a connecting pin eccentrically arranged with the driving rod. The other end is connected on the presser foot arm, the drive frame is fixed on the feed dog frame, and the eccentric radius of the drive rod is greater than the major axis radius of the ellipse motion track of the feed dog frame. The rear tug wheel of the present invention moves up and down together with the presser foot arm and the presser foot, which reduces the feeding steps of the operator and does not need to be additionally provided with an independent power source to drive the mop wheel, thereby reducing costs and improving efficiency.

Description

A kind of synchronous feeding device and sewing machine

technical field

The invention belongs to the technical field of sewing equipment, in particular to a synchronous feeding device and a sewing machine.

Background technique

Existing overlock sewing machine all is to finish the process of whole sewing cloth feeding by operator's hand pulling cloth. In the existing sewing operation process, due to the instability of the operator's manual pulling of the cloth, there is a deviation in the speed of the cloth. Therefore, the speed of the cloth pulling process will not match the speed of the teeth feeding of the sewing machine, and the pulling will be slow. The thread cutter on the sewing machine has the risk of cutting the cloth, which will cause deformation of the cloth and stitches, and affect the aesthetics of the stitches.

For above-mentioned phenomenon, my country's utility model patent (notification number CN 20341173U) discloses a kind of synchronous feeding device of sewing machine. The synchronous feeding device is arranged at the feeding teeth of the sewing machine, and includes a cloth feeding shaft, a connecting rod mechanism, a mopping shaft and a mopping wheel. Among them, the cloth feeding shaft and the mopping shaft are axially fixed on the sewing machine housing, and the cloth feeding shaft is used to connect with the power part, the cloth feeding shaft and the mopping shaft are connected by a connecting rod mechanism, and the cloth feeding shaft passes through the connecting rod The mechanism can drive the mop shaft to swing. The mop wheel is arranged on the mop wheel frame, and the mop wheel frame is provided with a transmission wheel one and a transmission wheel two. The transmission wheel one is driven to rotate by the mop shaft, and the transmission wheel two is connected with a mop wheel. Rotate and then drive the mop wheel to rotate. And the up and down movement of the mop wheel is driven by a specially set power part.

Although the above-mentioned structure solves the defects caused by the manual pulling of cloth by the existing operator, there are defects such as a complicated structure for driving the mop wheel to rotate, and an independent power source is required to drive the tug wheel.

Contents of the invention

The present invention aims at the above-mentioned problems existing in the existing technology, and provides a synchronous feeding device. The technical problem to be solved by the present invention is: how to realize the rotation of the rear tug wheel driven by the bracket, so that the feeding speed of the rear tug wheel is the same as that of the tooth Consistent, to ensure the aesthetics of the stitches of the sewing material after sewing.

The purpose of the present invention can be achieved through the following technical solutions:

A synchronous feeding device, including a rear tug wheel arranged on the rear end of the presser foot, the rear tug wheel is arranged on a driving rod, and the rear tug wheel rotates in one direction around the driving rod, one end of the driving rod is connected to one end of the tug wheel frame, and the other end There is a connecting pin eccentrically arranged with the driving rod, and the connecting pin is arranged in the strip groove of the driving frame to realize the intermittent one-way rotation of the rear tug wheel. The other end of the tug wheel frame is connected to the presser foot arm, and the driving frame Fixed on the feeding tooth frame, the eccentric radius of the driving rod is greater than the major axis radius of the elliptical motion track of the feeding tooth frame.

In the aforementioned synchronous feeding device, a one-way bearing is arranged between the rear tug wheel and the driving rod.

In the aforementioned synchronous feeding device, the rear tug wheel, the driving rod and the one-way bearing are arranged concentrically.

In the aforementioned synchronous feeding device, the other end of the driving rod is provided with a connecting plate, and a connecting pin is arranged on the connecting plate, and the connecting pin and the driving rod are arranged eccentrically.

In the aforementioned synchronous feeding device, the bar-shaped groove is located at the upper end of the driving frame and is an open groove, and the lower end of the driving frame is fixed on the feeding dog frame.

Another object of the present invention is to provide a sewing machine comprising a synchronous feeding device as described above.

Compared with the prior art, the present invention has the following advantages:

1. The rear tug wheel of the present invention moves up and down together with the presser arm and the presser foot, which reduces the feeding steps of the operator and does not need to be provided with an independent power source to drive the mop wheel, which reduces costs and improves efficiency.

2. Both the rear tug wheel and the feeding mechanism of the present invention are driven by the feeding rack, which realizes the synchronization of front and rear feeding, avoids the phenomenon of unsightly stitches in the prior art due to incorrect pulling and feeding of sewing workers, and realizes The complete synchronous cloth feeding with the main feeding rack ensures the aesthetics of the stitches after sewing.

Description of drawings

Fig. 1 is one of structural representations of the present invention.

Fig. 2 is the second structural diagram of the present invention.

Fig. 3 is a schematic diagram of the connection between the rear tugboat of the present invention and the tugboat frame and the driving frame.

Fig. 4 is an exploded schematic diagram of the connection between the rear tugboat, the tugboat frame and the drive frame of the present invention.

In the figure, 1, presser foot; 2, rear tug wheel; 3, drive rod; 4, tug wheel frame; 5, connecting pin; 6, drive frame; 7, strip groove; 8, presser foot arm; 9, feeding dog frame ; 10, step surface; 11, one-way bearing; 12, connecting plate.

detailed description

The following are specific embodiments of the present invention and in conjunction with accompanying drawings 1-4, further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

As shown in Figures 1, 2, and 3, a synchronous feeding device includes a rear tug wheel 2 arranged at the rear end of the presser foot 1, the rear tug wheel 2 is arranged on the drive rod 3, and the rear tug wheel 2 is unidirectional around the drive rod 3 Rotate, one end of driving rod 3 is connected on one end of tugboat frame 4, and the other end is provided with the connecting pin 5 that is arranged eccentrically with driving rod 3, and connecting pin 5 is arranged in the strip groove 7 of driving frame 6 and realizes rear tugboat 2 Intermittent one-way rotation, the other end of the tug wheel frame 4 is connected on the presser foot arm 8, and the driving frame 6 is fixed on the feeding dog frame 9. The specific connection method is: two threaded holes are provided on the presser foot arm 8, correspondingly, two mounting holes are provided at the other end of the tugboat frame 4, and the screws pass through the corresponding mounting holes and are screwed in the threaded holes to realize The connection between the tug wheel frame 4 and the presser foot arm 8.

In addition, the bar-shaped groove 7 is located at the upper end of the drive frame 6 and is an open groove. The lower end of the drive frame 6 inner wall is provided with a step surface 10, and the step surface 10 leans against the bottom plane of the feed dog frame 9, and the drive frame 6 is fixed on the feed dog frame 9 by screws.

The eccentric radius of the driving rod 3 according to the present invention is larger than the major axis radius of the elliptical motion track of the feeding carriage 9 , the purpose is to realize the swinging back and forth of the driving rod 3 .

As shown in Figure 4, the usual means to make the rear tug wheel 2 rotate in one direction is to set a one-way bearing. Therefore, a one-way bearing 11 is arranged between the rear tug wheel 2 and the driving rod 3 . Of course, one-way rotation can also be realized by setting a mechanical structure that restricts the rear tug wheel 2 to one direction. In comparison, the one-way bearing 11 has the advantages of simple structure and convenient implementation, and is preferred in this embodiment.

In addition, during installation, the rear tugwheel 2, the driving rod 3 and the one-way bearing 11 are arranged concentrically.

The implementation of the eccentric setting of the driving rod 3 and the connecting pin 5 in this embodiment is: a connecting plate 12 is arranged on the other end of the driving rod 3, a connecting pin 5 is arranged on the connecting plate 12, and the connecting pin 5 and the driving rod 3 eccentric settings.

Another object of the present invention is to provide a sewing machine comprising a synchronous feeding device as described above.

Working principle of the present invention:

When the sewing machine is working, the main shaft drives the feed rack 9 to move, the drive frame 6 installed on the feed rack 9 is driven by the feed rack 9, and the connecting pin 5 of the drive rod 3 is installed in the strip groove 7 of the drive frame 6 , because the motion trajectory of the feeding dog frame 9 is elliptical, and the eccentric distance between the drive rod 3 and the connecting pin 5 is greater than the major axis radius of the elliptical motion track of the feeding dog frame 9, so the drive rod 3 is made to swing back and forth, There is a one-way bearing 11 on the outside of the driving rod 3, and the outer ring of the one-way bearing 11 is equipped with the rear tugwheel 2, thereby realizing the intermittent one-way rotation of the rear tugwheel 2.

When the sewing material is placed under the presser foot 1, the presser foot 1 moves upward under the action of the presser foot lifting device, and the presser foot arm 8 is lifted up, and at the same time it is connected to the presser foot through the tug wheel frame 4. The rear tug wheel 2 on the arm 8 also moves upwards and when the presser foot 1 is pressing the sewing material, the rear tug wheel 2 also moves downwards thereupon and presses the sewing material. Because the main feeding tooth is driven by the feeding tooth frame 9, and the action of the rear tug wheel 2 is also driven by the feeding tooth frame 9, therefore, the rear tug wheel 2 moves synchronously with the main feeding tooth frame.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (6)

1. A synchronous feeding device, characterized in that: it includes a rear tug wheel arranged at the rear end of the presser foot, the rear tug wheel is arranged on the driving rod, and the rear tug wheel rotates in one direction around the driving rod, and one end of the driving rod is connected to the tug wheel frame One end and the other end are provided with a connecting pin eccentrically arranged with the driving rod, and the connecting pin is arranged in the bar-shaped groove of the driving frame to realize the intermittent one-way rotation of the rear tug wheel, and the other end of the tug wheel frame is connected to the presser arm Above, the drive frame is fixed on the feed rack, and the eccentric radius of the drive rod is larger than the major axis radius of the elliptical motion track of the feed rack. 2. A synchronous feeding device according to claim 1, characterized in that: a one-way bearing is arranged between the rear tug wheel and the driving rod. 3. A synchronous feeding device according to claim 2, characterized in that: the rear tug wheel, the driving rod and the one-way bearing are arranged concentrically. 4. A synchronous feeding device according to claim 1, characterized in that: the other end of the driving rod is provided with a connecting plate, a connecting pin is arranged on the connecting plate, and the connecting pin and the driving rod are arranged eccentrically. 5. A synchronous feeding device according to claim 1, characterized in that: the strip groove is located at the upper end of the driving frame, and the lower end of the driving frame is fixed on the feeding dog frame. 6. A sewing machine, characterized in that it comprises a synchronous feeding device as claimed in claims 1-5.