TWI493083B - Sewing machine direct drive feed mechanism - Google Patents

Description

Direct drive feeding mechanism of sewing machine

The invention relates to a feeding mechanism of a sewing machine, in particular to a direct drive feeding mechanism of a sewing machine.

Conventional sewing machines, because of the need of sewing, often require the sewing process of forward sewing or reverse sewing, which is commonly known as the work of the seam and the reverse seam in the industry, and the sewing machine mostly uses a single power source to cooperate with the control structure to turn. In order to achieve the needs of the seam and the reverse seam. The conventional reverse stitch transmission mechanism is to move the transmission member by hand to move a lever, and then use the rotation of the transmission shaft to drive the movement of the feed tooth, and the rough surface on the feed tooth drives the fabric back to the position. The purpose of re-sewing the fabric back, but such operation is very time consuming, and the hand must be pressed all the time, causing the burden on the operator to be aggravated, resulting in a significant reduction in the efficiency of the operator, which is not economical.

In view of this, some people have modified the electromagnet to cooperate with the connecting rod to drive the reverse stitching mechanism. However, although the electromagnet is used to control the connecting rod to achieve the automatic reverse stitching effect, the conventional electromagnet connects and drives the plurality of connecting rods. Then, the connecting rod is controlled by the connecting rod, so that the control mode of the feeding teeth to generate the positive and reverse stitches is complicated, and the connecting rod connected between the electromagnet and the transmitting member is loose or improperly assembled, which is incorrect. The power transmission and the indirect driving of the connecting rod and the electromagnet do not accurately control the angle of rotation of the linking member, and the movement of the feeding tooth cannot be further accurately controlled.

The main object of the present invention is to solve the problem of insufficient transmission accuracy of the reverse stitch structure of the conventional sewing machine.

In order to achieve the above object, the present invention provides a direct drive feed mechanism for a sewing machine, comprising a feed structure, a vertical drive structure, and a direction adjustment structure. The feed structure includes a swinging shaft, and a feed tooth pivotally disposed on the swinging shaft and interlocked by the swinging shaft to perform a horizontal reciprocating displacement. The vertical driving structure includes an eccentric rod connected to the feed dog and driven by a driving motor to perform a vertical reciprocating displacement of the feeding tooth, and an eccentric cam disposed on the eccentric rod and rotated by the eccentric rod . The directional adjustment structure includes a stepping motor, and an adjusting portion that is driven by the stepping motor to rotate to switch between a first position and a second position, the adjusting portion includes a rotating shaft pivotally connected to the stepping motor. a rail portion disposed in the rotating shaft, a linkage rod pivotally connected to the swinging shaft, the eccentric cam and having one end disposed in the rail portion and oscillated by the eccentric cam, and a connecting rod and the connecting rod The linkage rod is slidably moved back and forth in the rail portion, and when the adjusting portion is located at the first position and the second position, the linkage rod performs a first swinging stroke and a second swinging stroke, respectively. The cloth tooth performs a forward feeding stroke when the linkage lever performs the first swinging stroke, and performs a reverse feeding stroke when the linkage lever performs the second swinging stroke.

In one embodiment, the eccentric rod includes a main rod that is driven by the eccentric cam and driven to rotate by the driving motor, a connecting portion pivotally connected to the feeding tooth, and an eccentricity disposed at one end of the main rod The connecting portion is connected to and coupled to the auxiliary rod to cause the feeding tooth to perform the vertical reciprocating displacement of the auxiliary rod.

The beneficial effects of the invention are:

According to the present invention, the stepping motor directly interlocks the rotating shaft of the adjusting portion, and the rotating shaft is rotationally switched to the first position and the second position, and the running track of the linking rod is changed to perform the first swinging stroke and the second swinging stroke. And the linkage rod changes the position of the feeding tooth to perform the horizontal reciprocating displacement by different running track, and cooperates with the driving force of the vertical reciprocating displacement provided by the eccentric rod to make the feeding tooth forward and reverse. The two delivery strokes. Therefore, the feeding mechanism of the sewing machine is not connected to the plurality of connecting rods to control the rotating shaft. The present invention directly drives the rotating shaft with the stepping motor, so as to accurately control the rotation angle of the rotating shaft, thereby increasing the precision during adjustment. , and the sewing machine sewing quality is more detailed.

100‧‧‧ sewing machine

1‧‧‧Feed structure

11‧‧‧Swing shaft

12‧‧‧ delivery teeth

2‧‧‧Vertical drive structure

21‧‧‧Eccentric rod

211‧‧‧ main pole

212‧‧‧Connecting Department

213‧‧‧Auxiliary

22‧‧‧Eccentric cam

3‧‧‧ Directional adjustment structure

31‧‧‧Stepper motor

32‧‧‧Regulatory Department

321‧‧‧ shaft

322‧‧‧Track Department

323‧‧‧ linkage rod

324‧‧‧ slider section

A1‧‧‧ first position

A2‧‧‧ second position

A3‧‧‧ third position

Figure 1 is a schematic view of the assembled position of a preferred embodiment of the present invention.

Figure 2 is a schematic view of the appearance of a preferred embodiment of the present invention.

Figure 3 is a schematic exploded view of a preferred embodiment of the present invention.

Fig. 4 is a schematic view showing the operation of the forward feed stroke according to a preferred embodiment of the present invention.

Figure 5 is a schematic view of the reverse feed stroke of a preferred embodiment of the present invention.

The detailed description and technical contents of the present invention will now be described as follows:

Referring to FIG. 1 , FIG. 2 and FIG. 3 , FIG. 1 , FIG. 2 and FIG. 3 are schematic diagrams showing an assembly position, an external view and a structural exploded view of a preferred embodiment of the present invention. As shown in the figure, the present invention provides a direct drive feeding mechanism for a sewing machine. In a sewing machine 100, the direct drive feed mechanism of the sewing machine includes a feed structure 1, a vertical drive structure 2, and a direction adjustment structure 3. The feed structure 1 includes a swinging shaft 11 and a feed dog 12 pivotally coupled to the swing shaft 11 and coupled by the swing shaft 11. The vertical driving structure 2 includes an eccentric rod 21 connected to the feed dog 12 and driven by a driving motor (not shown), and an eccentric cam 22 disposed on the eccentric rod 21 and rotated by the eccentric rod 21. The driving motor is disposed above the eccentric rod 21 and transmitted through the belt to drive the eccentric rod 21 to pivot. The directional adjustment structure 3 includes a stepping motor 31, and an adjustment portion 32 that is rotated by the stepping motor 31 to switch between a first position A1 and a second position A2. The adjusting portion 32 includes a rotating shaft 321 pivotally connected to the stepping motor 31, a rail portion 322 disposed in the rotating shaft 321 , a pivoting shaft 11 and an eccentric cam 22 disposed at one end of the rail The interlocking rod 323 in the portion 322 and oscillated by the eccentric cam 22, and a slider portion 324 connected to the interlocking rod 323 and sliding back and forth in the rail portion 322 by the interlocking rod 323, the present invention transmits The stepping motor 31 directly drives the rotating shaft 321 to pivot the rotating shaft 321 at different angles to drive the feeding structure 1 to perform a forward or reverse feeding stroke. The specific instructions are as follows:

The forward feed stroke of the present invention is as shown in FIG. 4. The eccentric rod 21 includes a main rod 211 that is rotated by the eccentric cam 22 and driven by the drive motor, and is pivotally connected to the feed dog 12. The connecting portion 212 and a sub-rod 213 that is eccentrically disposed on one end of the main rod 211 and connected to the connecting portion 212 and interlocked by the main rod 211. The main rod 211 is normally driven by the driving motor to maintain a clockwise/counterclockwise rotation. The eccentrically disposed auxiliary rod 213 is also rotated by the main rod 211, and the feeding teeth are linked through the connecting portion 212. 12, providing a driving force of the feed dog 12 in a vertical direction, and further performing a vertical reciprocating displacement, wherein the vertical direction is coaxial with a circular center line of the longitudinal section of the main rod 211. When the stepping motor 31 drives the rotating shaft 321 to be in the first position A1, the rail portion 322 has an inclination angle, and the eccentric cam 22 is rotated by the main rod 211, and the linkage rod 323 is driven to pull the slider. The portion 324 slides back and forth within the rail portion 322 to perform a first swinging stroke. Since the linkage rod 323 is pivotally connected to the swinging shaft 11, when the linkage rod 323 performs the first swinging stroke, the swinging shaft 11 is oscillated back and forth by the linkage rod 323, thereby interlocking the feeding. The teeth 12 undergo a horizontal reciprocating displacement. Therefore, the feed dog 12 swings back and forth on the side of the center line to perform the horizontal reciprocating displacement when the interlocking lever 323 performs the first swinging stroke, and forms a forward feeding stroke in conjunction with the vertical reciprocating displacement.

In addition, the reverse feed stroke of the present invention is shown in FIG. 5. The stepping motor 31 can be connected to a control unit (not shown). The control unit can be a switch, a control interface or a remote control. The device transmits a control signal to the stepping motor 31 through the control unit, so that the stepping motor 31 directly drives the rotating shaft 321 of the adjusting portion 32 to rotate an angle to the second position A2, and the control unit can have an automatic The mode and a manual mode drive the stepping motor 321 to rotate when the preset condition (such as the sewing time, the number of stitches, etc.) is satisfied in the automatic mode. In the manual mode, the user can decide at a time when to drive the stepping motor 31 depending on the sewing condition. When the rotating shaft 321 is driven to rotate by the stepping motor 31 to the second position A2, the inclination angle of the rail portion 322 is also changed, thereby changing the angle at which the slider portion 324 slides back and forth, and interlocking the The interlocking lever 323 performs a second swinging stroke. When the swinging manner of the interlocking lever 323 is changed from the first swinging stroke to the second swinging stroke, the swinging axle 11 is also interlocked by the interlocking lever 323 to change the swinging angle, thereby interlocking the feeding tooth 12 and changing the The feed dog 12 performs the horizontal reciprocating displacement position. Further, when the linkage lever 323 performs the second swinging stroke, the feed dog 12 swings back and forth on the other side of the center line to perform the horizontal reciprocating displacement, and at this time, the main lever 211 is still driven by the driving motor. While maintaining the rotation in the same direction, the eccentrically disposed sub-rod 213 is continuously rotated by the main rod 211, and the feed dog 12 is interlocked through the connecting portion 212 to provide the driving force of the feed tooth 12 in the vertical direction. The vertical reciprocating displacement is performed, and the horizontal reciprocating displacement on the other side of the center line plus the vertical reciprocating displacement forms a reverse feed stroke.

In addition, since the stepping motor 31 of the present invention can accurately control the rotation angle of the rotating shaft 321 , by adjusting the rotation angle of the rotating shaft 321 , the stroke of the slider portion 324 to slide back and forth in the rail portion 322 can be further adjusted. The angle at which the rotation shaft 321 rotates is larger, that is, the more the rail portion 322 is inclined, the shorter the stroke of the slider portion 324 sliding back and forth in the rail portion 322, thereby increasing the speed at which the feed dog 12 pushes the cloth. At the same sewing speed, the stitch length of the sewing needle (not shown) of the sewing machine 100 on the cloth will be smaller, and the smaller the angle of rotation of the rotating shaft 321 is, the slider portion 324 is The longer the stroke of the rail portion 322 to slide back and forth, the lower the speed at which the feed dog 12 pushes the fabric. Therefore, at the same sewing speed, the stitch length of the sewing needle of the sewing machine 100 on the cloth will be Therefore, the present invention can control the thick needle and the fine needle of the sewing machine 100 through the stepping motor 31, and the switch of the thick needle and the fine needle is controlled by a knob according to the conventional sewing machine. It simplifies the way you use it.

The stepping motor 31 of the present invention further drives the rotating shaft 321 to rotate to a third position A3 between the first position A1 and the second position A2. Specifically, the third position A3 is an origin. When the rotating shaft 321 is located at the third position A3, the eccentric cam 22 interlocks the movement track of the linkage rod 323 with the slider portion 324 on the track. In the portion 322, the movement trajectory of the linkage rod 323 is offset, so that the linkage rod 323 does not interlock the rotation of the swing shaft 11, and the feed dog 12 is in a stationary state. The stepping motor 31 can freely control the rotation shaft 321 to switch to the first position A1, the second position A2, and the third position A3, and control the feed dog 12 to perform the forward, reverse, and stationary transmission. Cloth trip.

According to the present invention, the stepping motor 31 directly interlocks the rotating shaft 321 of the adjusting portion 32, and the rotating shaft 321 is rotationally switched to the first position A1 and the second position A2, and the running track of the interlocking rod 323 is changed to perform the first a swinging stroke and the second swinging stroke. The linkage rod 323 can change the position of the feeding tooth 12 to perform the horizontal reciprocating displacement by different running track, and the driving force of the vertical reciprocating displacement provided by the eccentric rod 21 can be used to make the feeding tooth 12 Two feeding strokes in the forward and reverse directions. Therefore, the feeding mechanism of the conventional sewing machine is not required to be connected to the rotating shaft through the electromagnet, and the rotating shaft 321 is directly driven by the stepping motor 31, so that the angle of rotation of the rotating shaft can be accurately controlled, thereby increasing The accuracy of the adjustment can be directly controlled by the stepping motor 31 to directly control the coarse/fine needle of the sewing machine 100, so that the sewing quality of the sewing machine is more detailed.

The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Variations and modifications are still within the scope of the patents of the present invention.

1‧‧‧Feed structure

11‧‧‧Swing shaft

12‧‧‧ delivery teeth

2‧‧‧Vertical drive structure

21‧‧‧Eccentric rod

22‧‧‧Eccentric cam

3‧‧‧ Directional adjustment structure

31‧‧‧Stepper motor

32‧‧‧Regulatory Department

321‧‧‧ shaft

322‧‧‧Track Department

323‧‧‧ linkage rod

324‧‧‧ slider section

Claims (1)

A direct drive feeding mechanism for a sewing machine, comprising: a feeding structure, comprising a swinging shaft, and a feeding tooth pivotally disposed on the swinging shaft and being horizontally reciprocally displaced by the swinging shaft; The vertical driving structure comprises an eccentric rod connected to the feeding tooth and driven by a driving motor to perform a vertical reciprocating displacement of the feeding tooth, and an eccentric cam disposed on the eccentric rod and rotated by the eccentric rod The eccentric rod includes a main rod that is driven by the eccentric cam and driven to rotate by the driving motor, a connecting portion pivotally connected to the feeding tooth, and an eccentrically disposed end of the main rod connected to the connecting portion a secondary rod that is coupled to the feed dog to perform the vertical reciprocating displacement; and a direction adjustment structure including a stepping motor, and a rotation of the stepping motor to switch between a first position and a second a adjusting portion of the position, the adjusting portion includes a rotating shaft pivotally connected to the stepping motor, a rail portion disposed in the rotating shaft, a pivoting shaft, the eccentric cam and one end disposed on the rail portion And the linkage rod that is oscillated by the eccentric cam and the linkage rod is connected to the linkage rod and is slid back and forth in the rail portion by the linkage rod, and when the adjustment portion is located at the first position and the second position, respectively The linkage rod performs a first swinging stroke and a second swinging stroke of the slider portion, and the feeding tooth performs a forward feeding stroke when the linkage lever performs the first swinging stroke, and performs the forward feeding stroke on the linkage rod A reverse feed stroke is performed during the second swinging stroke.