CN1134562C - Cloth feeding device of sewing machine - Google Patents

Abstract

To provide a cloth feeding device for a sewing machine with a simple structure, easy manufacture, low cost, and miniaturized drive motors, characterized in that it has an eccentric eccentric with respect to the rotating shafts that rotate in conjunction with the rotation of the two drive motors 4a, 4b, respectively. A pair of eccentric parts 13 of the shaft 14; one end is freely swingably connected to the eccentric shaft 14 of the aforementioned pair of eccentric parts 13 and the other end is arranged on a straight line perpendicular to the length direction of the cloth feeding table 6, and can be A pair of connecting arms 15 are freely swingably connected to the cloth feeding table 6 .

Description

Cloth feeding device for sewing machine

The present invention relates to a cloth feeding device for a sewing machine, in particular to a cloth feeding device for a sewing machine which sews an object to be sewn while moving in an X-Y plane.

Conventionally, for example, in a cycle sewing machine that sews buttons or the like, a sewing machine cloth feeder that sews a to-be-sewn object while moving the to-be-sewn object in the X direction and the Y direction is often used.

For example, in FIG. 16 , the cloth feeding table 40 that holds the sewn object and moves the sewn object is arranged on the sewing machine frame, and a guide extending along the length direction of the cloth feeding table 40 is formed on the cloth feeding table 40 The hole 41 and the engaging hole 42 are provided below the cloth feeding table 40 with a first drive motor 43 and a second drive motor 49 .

Near the first drive motor 43 is provided a swing lever 46 that can freely swing around the rotation axis M. As shown in FIG. The output gear 45 fixed to the output shaft 44 of the first driving motor 43 is engaged with a gear portion 47 formed at one end of the swing lever 46 . The other end portion of the swing lever 46 is rotatably attached to a support stopper 48 engaged with the guide hole 41 of the aforementioned cloth feeding table 40 .

Near the second drive motor 49, a rack member 52 is disposed so as to be movable in the longitudinal direction. The pinion 51 fixed to the output shaft 50 of the second driving motor 49 is engaged with rack teeth 52 a formed on the side surface along the longitudinal direction of the rack member 52 . In addition, the front end of the rack member 52 is fixed with a support arm 53 extending perpendicularly to the longitudinal direction of the rack member 52, and the front end of the support arm 53 is fitted with an arm that engages in the engaging hole 42 of the aforementioned cloth feeding table 40. The engaging pin 54 of.

In the above-mentioned conventional sewing machine cloth feeding device, under the rotational drive of the first driving motor 43, the swing lever 46 is swung by the output gear 45 and the gear part 47, thereby, by means of the support stopper 48, the cloth feeding table 40 moves in the arrow X direction.

In addition, when the pinion 51 is rotated by the rotation drive of the second drive motor 49, the rack member 52 moves along its longitudinal direction through the rack teeth 52a, thereby, the cloth is fed by the engaging pin 54 of the supporting arm 53. The stage 40 moves in the arrow Y direction.

The cloth feed table 40 can be moved to an arbitrary position in the X direction and the Y direction only by rotating the first drive motor 43 and the second drive motor 49 by an arbitrary amount of rotation.

However, in the aforementioned conventional sewing machine cloth feeding device, when the cloth feeding table 40 moves toward the X direction and the Y direction, since separate moving mechanisms are provided, the structure is very complicated, the mechanism is huge, and at the same time, the number of parts is large. There are problems of difficulty in manufacturing and high manufacturing cost. Moreover, since the movement of the cloth feed table 40 towards the X direction and the Y direction is carried out by the drive motors 43, 49 respectively, the burden on the drive motors 43, 49 is increased. 43, 49 The problem of miniaturization.

SUMMARY OF THE INVENTION The object of the present invention is to provide a cloth feeding device for a sewing machine which is simple in structure, easy to manufacture and low in cost, and capable of miniaturizing a driving motor.

In order to achieve the aforementioned object, the cloth feeding device of the sewing machine according to the technical solution 1 of the present invention is a cloth feeding device of the sewing machine in which the cloth feeding table holding the object to be sewn is moved in a plane by two driving motors, and is characterized in that, Comprising: a pair of eccentric parts having eccentric shafts that are eccentric to the rotating shafts that rotate in conjunction with the rotation of the respective drive motors; A pair of connecting members (connecting arm 15, ball joint 31) are arranged on a straight line perpendicular to the longitudinal direction of the cloth feeding table and are freely swingably connected to the cloth feeding table.

According to the cloth feeding device of the sewing machine according to claim 1 of the present invention, by rotating each driving motor in an arbitrary direction to rotate each eccentric member, each connecting member can be swung and the cloth feeding table connected to the connecting member can be swung. Move in the X-Y plane.

Furthermore, since the movement of the cloth feeding table in the X direction and the Y direction is generally realized by driving two driving motors, the load on each driving motor is small, and the driving motors can be miniaturized. In addition, since the rotational force of each drive motor is transmitted by a mechanism with a simple structure to move the cloth feeding table, the structure is simple, the number of parts is small, and the manufacture is easy and low in cost.

The invention according to claim 2 of the present invention is characterized in that, in claim 1, each of the drive motors, the pair of eccentric members, and the pair of connecting members are arranged in symmetrical positions with respect to the center line of the cloth feeding table. position.

According to the invention described in claim 2 of the present invention, the movement control of the cloth feed table due to the rotation of the driving motor is very easy, and the balance performance is also good.

As mentioned above, in the cloth feeding device of the sewing machine of the present invention described in claim 1, since the cloth feeding table is usually moved in the X direction and the Y direction by driving each driving motor, the load applied to each driving motor Small, enabling miniaturization of the drive motor. In addition, since the rotational force of each drive motor is transmitted by a mechanism with a simple structure to move the cloth feeding table, the structure is simple, the number of parts is small, the manufacture is easy, and the cost is low.

In addition, in the invention described in claim 2, since the driving motor, the eccentric member, and the connecting member are arranged at symmetrical positions with respect to the central axis of the cloth feeding table, there is movement of the cloth feeding table due to the rotation of the driving motor. Controls are very easy and other effects.

Fig. 1 shows a perspective view of an embodiment of a cloth feeding device in a sewing machine according to the present invention.

Fig. 2 is an exploded perspective view of the cloth feeding device in the sewing machine shown in Fig. 1 .

Fig. 3 is a view for explaining the operation of the cloth feeding table in the cloth feeding device of the present invention.

Fig. 4 is a perspective view of another embodiment when the installation position of the driving motor in the cloth feeding device of the sewing machine of the present invention is changed.

Fig. 5 is a perspective view of still another embodiment when the installation position of the driving motor in the cloth feeding device of the sewing machine of the present invention is changed.

Fig. 6 is a perspective view of still another embodiment when the installation position of the driving motor in the cloth feeding device of the sewing machine of the present invention is changed.

Fig. 7 is a perspective view of still another embodiment when the installation position of the driving motor in the cloth feeding device of the sewing machine of the present invention is changed.

Fig. 8 is a perspective view of still another embodiment when the installation position of the driving motor in the cloth feeding device of the sewing machine of the present invention is changed.

Fig. 9 is an exploded perspective view of an embodiment of the drive transmission mechanism according to the installation position of the drive motor.

Fig. 10 is an exploded perspective view of another embodiment of the drive transmission mechanism according to the installation position of the drive motor.

Fig. 11 is an exploded perspective view of another embodiment of the drive transmission mechanism according to the installation position of the drive motor.

Fig. 12 is an exploded perspective view of another embodiment of the drive transmission mechanism according to the installation position of the drive motor.

Fig. 13 is an exploded perspective view of another embodiment of the drive transmission mechanism according to the installation position of the drive motor.

Fig. 14 is an exploded perspective view of another embodiment of the drive transmission mechanism according to the installation position of the drive motor.

Fig. 15 is an exploded perspective view of another embodiment of the drive transmission mechanism according to the installation position of the drive motor.

Fig. 16 is an exploded perspective view of a cloth feeding device in a conventional sewing machine.

Fig. 1 and Fig. 2 show an embodiment of the cloth feeding device in the sewing machine of the present invention, and the frame body 1 is accommodated inside the sewing machine body cover which is not shown in the figure. The frame body 1 is composed of a box-shaped base 2 and a cylindrical frame 3 integrally formed with one side of the base 2. The box-shaped base 2 accommodates, not shown in the figure, the sewing mechanism of the sewing machine, etc. to operate. drive shaft, etc. A vertical fuselage part not shown in the figure and an arm part extending from the vertical fuselage part and facing above the frame part 3 are also formed upward from the base part 2 .

In this embodiment, in the rear half of the base portion 2 opposite to the frame portion 3, the first drive motor 4a and the second drive motor 4b made of pulse motors are arranged side by side. The output shafts 5, 5 of the second drive motors 4a, 4b protrude upward from the upper surface of the base 2. As shown in FIG.

On the upper surface of the frame portion 3 is provided a cloth feeding table 6 extending along the longitudinal direction of the frame portion 3 , and a cloth pressing plate 7 for supporting the sewing object is fixed to the front end of the cloth feeding table 6 . The front end of the cloth clamping plate 7 is provided with a common square pinhole 8 for needle penetration. A predetermined cloth is sandwiched and held between the buttons supported by the button support plate mounted on the cloth feeding table 6 not shown in the figure and the front end portion of the cloth pressing plate 7 forming the pinhole 8 .

A support stopper 10 having a rectangular plane is rotatably attached to the frame portion 3 via a pin 10A. A guide hole 9 extending in the longitudinal direction is formed at the center of the cloth feeding table 6, and the support stopper 10 is fitted in the guide hole 9 so as to be slidable in the longitudinal direction. In this way, the cloth feed table 6 can freely rotate around the pin 10A and can move freely in the longitudinal direction of the guide hole 9 . By such action of the cloth feeding table 6, the cloth clamping plate 7 mounted on the front end of the cloth feeding table 6 can move in the plane along the Y direction along the length direction of the frame portion 3 and the X direction perpendicular to the Y direction.

The drive motors 4a, 4b are arranged symmetrically across a straight line along the Y direction, that is, the center line of the cloth feed table 6, wherein the Y direction is the frame portion 3 passing the axis of the pin 10A supporting the support stopper 10. the length direction.

A substantially T-shaped connecting plate 11 is fixed to the base end of the aforementioned cloth feeding table 6, and on the connecting plate 11, a pair of support pins are protruded side by side along a straight line perpendicular to the length direction of the cloth feeding table 6. 12.

Eccentric members 13, 13 having the same shape are fixed to the output shaft 5 of the first drive motor 4a and the output shaft 5 of the second drive motor 4b, respectively. The eccentric member 13 is provided with eccentric shafts 14 , 14 that are eccentric with respect to the respective output shafts 5 . In addition, the engaging holes 16 of the connecting arms 15, 15 as connecting members are rotatably fitted in the aforementioned pair of supporting pins 12, and at the same time, the engaging holes 17 formed at the other ends of the connecting arms 15 are rotatably fitted in the respective pins. On the eccentric shaft 14 of the eccentric part 13. Each support pin 12 and the eccentric shaft 14 are connected by respective connecting arms 15 . A pair of connection arms 15, 15 are formed in the same shape. Thus, each pair of eccentric members 13, connecting arms 15, etc. are arranged symmetrically sandwiching a straight line along the Y direction, which is the lengthwise direction of the frame portion 3 passing the axis of the pin 10A supporting the support stopper 10.

Next, the action of this embodiment will be described.

First, the reference position of the present embodiment is the state shown in Fig. 3(c). In Fig. 3(c), the pinhole 8 of the cloth clamping plate 7 is located at the center of the sewing range. In this state, the support block 10 It is located approximately in the center of the guide hole 9 in the longitudinal direction of the cloth feeding table 6, and at the same time, each connecting arm 15 and each eccentric member 13 are arranged bilaterally symmetrically. In this reference position, the connecting arm 15 is arranged at 45° relative to the line connecting the two support pins 12 . And the eccentric direction of the eccentric parts 13, 13 is also set to be 45° relative to the aforementioned straight line. That is, the angle formed by the pair of connecting arms 15 is a right angle, and the angle formed by the connecting arm 15 and the eccentric member 13 is also a right angle.

From this state, the first drive motor 4a is made to rotate clockwise in Fig. 3 and the second drive motor 4b is rotated by the same amount in the counterclockwise direction in Fig. 3 respectively, and the two eccentric parts 13 are also rotated in the same amount. 14. Each connecting arm 15 pushes up the connecting plate 11 above FIG. 3 . As a result, the cloth feeding table 6 moves to the front end side in the longitudinal direction of the frame portion 3 while being guided by the support stopper 10 and the guide hole 9 . Then, the above-mentioned pinhole 8 part moves to the upper side of FIG. 3 along the Y direction, and becomes the state shown in FIG. 3( d ).

In addition, from the state of the aforementioned reference position, the first drive motor 4a is rotated counterclockwise in FIG. 3 and the second drive motor 4b is rotated by the same amount in the clockwise direction in FIG. , through the eccentric shaft 14, each connecting arm 15 pulls the connecting plate 11 to the bottom of FIG. 3 . As a result, the cloth feeding table 6 moves to the proximal end side in the longitudinal direction of the frame portion 3 while being guided by the guide hole 9 and the support stopper 10 . Then, the above-mentioned pinhole 8 part moves to the bottom of FIG. 3 along the Y direction, and becomes the state shown in FIG. 3(e).

And then, from the state of the reference position of Fig. 3 (c), only make the 1st drive motor 4a and the 2nd drive motor 4b rotate counterclockwise in Fig. 3 with the prescribed amount of rotation respectively set, two eccentric parts 13 rotate , through the eccentric shaft 14, each connecting arm 15 moves the connecting plate 11 to the left in FIG. 3 . Thereby, the cloth feed table 6 rotates clockwise about the pin 10A which supports the support stopper 10 as a center. Then, the part of the aforementioned pinhole 8 moves up to the right in FIG. 3 along the X direction, and becomes the state shown in FIG. 3( a ).

In addition, from the state of the reference position, only the first driving motor 4a and the second driving motor 4b are rotated clockwise in FIG. Each connecting arm 15 swings, and the connecting plate 11 moves to the right in FIG. 3 . As a result, the cloth feeding table 6 rotates counterclockwise around the aforementioned pin 10A. Then, the part of the aforementioned pinhole 8 moves up to the left in FIG. 3 along the X direction, and becomes the state shown in FIG. 3( b ).

When the above-mentioned first and second drive motors 4a, 4b rotate clockwise or counterclockwise in Fig. 3, the cloth feeding table 6 can be moved in the front-rear direction and the left-right direction by specifying the rotation amounts of the two drive motors 4a, 4b. Composite direction of , that is, oblique movement.

In this embodiment, by controlling the rotation direction and rotation amount, that is, the rotation position, of the first drive motor 4a and the second drive motor 4b from the state of the reference position, the aforementioned actions can be performed or combined, so that the aforementioned needle The hole 8 moves to any position in the X-Y plane.

Therefore, in the present embodiment, since the cloth feeding table 6 is generally moved in the X direction and the Y direction by driving both the first drive motor 4a and the second drive motor 4b, the load on the respective drive motors 4a, 4b is small. , can make the drive motors 4a, 4b miniaturized. In addition, since the cloth feeding table 6 is moved by transmitting the rotational force of the drive motors 4a, 4b through a simple link mechanism, the structure is simple, the number of parts is small, the manufacture is easy, and the cost is low.

4-15 show other embodiments of the cloth feeding device in the sewing machine of the present invention.

In the embodiment shown in Fig. 4, the first drive motor 4a and the second drive motor 4b are disposed bilaterally symmetrically across the straight line passing through the aforementioned pin 10A, and their output shafts 5, 5 are obliquely installed mutually pointing inward. And, as shown in Figure 9, the output shaft 5 of each driving motor 4a, 4b is fixed with the eccentric member 13 of the eccentric shaft 14, and the ball joint 31 formed by twisting the two ends perpendicularly, to change each driving motor 4a , 4b in the direction of rotation, connect the eccentric shaft 14 and the support pin 12 on the connecting plate 11 .

In the embodiment shown in FIG. 5, the first drive motor 4a and the second drive motor 4b are symmetrically arranged across a straight line passing through the pin 10A, and their output shafts 5, 5 are arranged side by side extending parallel to the Y direction. And as shown in Figure 10, bevel gear 20 is installed on the output shaft 5 of aforementioned driving motor 4a, 4b, meanwhile, disposes eccentric part 13, and eccentric part 13 has the pivot that can rotate freely centering on vertical axis through bearing 18. The rotating shaft 19 supported by the shaft and the eccentric shaft 14 eccentric relative to the rotating shaft 19, the bevel gear 21 fixed on the lower end of the aforementioned rotating shaft 19 meshes with the aforementioned bevel gear 20 to change the rotation direction of each driving motor 4a, 4b. One end of the connecting plate 15 is freely swingably mounted on the eccentric shaft 14 of the aforementioned eccentric component 13 .

In the embodiment shown in FIG. 6, the first drive motor 4a and the second drive motor 4b are symmetrically arranged on both sides of the end of the base 2 of the frame body 1, sandwiching a straight line passing through the aforementioned pin 10A. , The output shafts 5, 5 are arranged opposite to each other extending along the X direction. The connection between the output shafts 5, 5 of the two motors 4a, 4b and the connecting plates 15, 15 may be the structure of the aforementioned Fig. 10 .

In addition, as shown in Figure 5 or Figure 6, when the drive motors 4a, 4b are installed, the connection mechanism between the output shaft 5 and the connecting plate 15 as the drive motors 4a, 4b can be the structure shown in Figure 11, that is, the drive motor A helical gear 22 is installed on the output shaft 5 of 4a, 4b, and a helical gear 23 is installed at the lower end of the rotating shaft 19 of the eccentric member 13 to replace the bevel gears 20, 21 described in FIG. 10 .

Furthermore, as shown in Figure 12, belt pulleys 24,25 are respectively housed on the output shafts 5 of the drive motors 4a, 4b and the rotating shaft 19 of the eccentric part 13, by straddling the synchronous belt 26 between each belt pulleys 24,25, The direction of rotation of the drive motors 4a, 4b can be changed.

In the embodiment shown in FIG. 7 , the first drive motor 4 a and the second drive motor 4 b are symmetrically arranged on both sides of the end of the base 2 of the frame body 1 with a straight line passing through the aforementioned pin 10A sandwiched between them. Its output shafts 5, 5 extend vertically upwards and are arranged side by side with each other.

In the embodiment shown in FIG. 8, the first drive motor 4a and the second drive motor 4b are symmetrically arranged on the rear side of the end of the base 2 of the frame body 1, sandwiching a straight line passing through the aforementioned pin 10A, Its output shafts 5 extend vertically upwards and are arranged opposite to each other.

In the embodiment shown in FIG. 7 and FIG. 8 , the mechanism for connecting the drive motors 4a, 4b and the connecting plate 11 may be a structure in which the output shaft 5 is directly connected to the eccentric member 13 shown in FIG. 2 .

In addition, in the structure shown in Figure 7 and Figure 8, as shown in Figure 13, the output shaft 5 of drive motor 4a, 4b is equipped with the rotating plate 28 that a part forms gear part 27, and at the same time, the rotating shaft 19 of eccentric member 13 Mounted thereon is a rotating shaft 30 forming a gear portion 29 meshing with the gear portion 27 of the aforementioned rotating plate 28 .

Alternatively, as shown in FIG. 14 , the rotating shaft 19 and the eccentric shaft 14 may be formed on the rotating plate 30 itself, and the rotating plate 30 may function as an eccentric component.

At this time, one end of the connecting arm 15 is freely swingably mounted on the eccentric shaft 14 of the aforementioned eccentric member 13, and the eccentric member 13 is rotated through each rotating plate 28, 30 by driving each drive motor 4a, 4b, thereby, The connecting plate 11 can be moved in the X-direction and the Y-direction by means of the connecting arm 15 .

Furthermore, as shown in Figure 15, belt pulleys 24, 25 are respectively installed on the output shafts 5 of the driving motors 4a, 4b and the rotating shaft 19 of the eccentric part 13, and the belt pulleys 24, 25 are straddled between each belt pulleys 24, 25 belt26.

The shown cloth feeding table 6 and the connecting plate 11 are separately provided, but they can also be provided integrally.

In addition, even in the above-mentioned embodiments, the connecting structures of the drive motors 4a, 4b and the eccentric member 13 are arranged symmetrically with a straight line along the Y direction, wherein the Y direction is provided by supporting the aforementioned support stopper 10. The axis of the pin 10A is not necessarily arranged symmetrically to the left and right in the longitudinal direction of the frame portion 3 .

Claims (2)

1. A cloth feeding device for a sewing machine, characterized in that it has a cloth feeding table that is rotatably supported on a sewing machine frame portion around a fixed axis and that is formed with a guide hole movable in a longitudinal direction relative to the axis of rotation ; at one end of the length direction of the cloth feeding table, on a straight line perpendicular to the length direction, a pair of connecting parts that can be rotatably supported on the cloth feeding table with their respective fixed axes as the center; and the respective connecting parts A pair of eccentric parts connected; in order to displace the respective displacement parts, a pair of driving motors connected to the output shaft and the eccentric parts; the eccentric parts are respectively displaced by the two driving motors, and the two connecting parts make The cloth feeding table moves in the length direction of the guide hole or rotates around the rotation axis. 2. The cloth feeding device of the sewing machine according to claim 1, wherein each of the drive motors, a pair of eccentric parts and a pair of connecting parts are arranged symmetrically with respect to the center line of the cloth feeding table. position.

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