JPH07136363A - Feeding mechanism for sewing machine - Google Patents

Abstract

PURPOSE:To improve the product quality, continuously feed a sewing object, reduce the speed change of the sewing object, and satisfactorily sew it by supplementing the deficiency of the lift quantity by a lift foot with the differential feed by a presser foot. CONSTITUTION:This feeding mechanism for a sewing machine is provided with a mechanism 31 vertically moving a lift foot 35 and a presser foot 25 in nearly opposite phases after receiving the prescribed rocking motion, a needle bar 19 having a needle 51 and vertically moved synchronously with the lift foot 35, a needle bar rocking means 60 vertically movably supporting and rocking the needle bar 19 and the lift leg 35, and a presser foot rocking means 61 vertically movably supporting the presser foot 25 and rocking the lift foot 35 in nearly opposite phases.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine feed mechanism.

[0002]

2. Description of the Related Art Conventionally, when performing, for example, piping sewing, an integrated feed sewing machine is used to sew an upper cloth and a lower cloth together. This comprehensive feed sewing machine is provided with a bell crank as a mechanism for vertically moving the upper feed foot and the presser foot in substantially opposite phases in response to a swinging motion according to the rotation of the upper shaft, and a sewing needle. A needle bar that moves up and down in synchronism with the foot, and a needle bar and an upper feed foot that support the needle bar and the upper feed foot so that the needle bar and the upper feed foot swing in relation to the rotation of the lower shaft. The upper feed foot and the lower feed cloth are sandwiched between the upper feed foot and the feed dog on the sewing machine bed side from above and below, and the sewing needle is pierced into the upper cloth and the lower cloth, and the upper feed foot is provided. And the feed dog cooperate to feed the upper cloth and the lower cloth together in the feeding direction.When the cloth is fed by the bell crank, the presser foot floats from the upper cloth, and the presser foot when the cloth is stopped. It is to press the top cloth with.

[0003]

However, the above-mentioned conventional integrated feed sewing machine has the following problems. That is, since the upper feed force by the upper feed foot is inferior to the lower feed force by the feed dog, as shown in FIG. There is a problem that the cloth B is bent, resulting in a defective product.

Here, if the upper feed amount by the upper feed foot can be increased, the above problem can be solved, but since the sewing machine needle is stuck as described above at the time of cloth feed, the needle is stabbed. Will be broken.

In addition, the feed dog is not an ordinary elliptical feed,
It is possible to address the above problems by making horizontal feed and weakening the lower feed force, but for example, when sewing a soft sponge-like sewn product, the feed force decreases significantly, making sewing difficult. It is not desirable because it will end up.

Furthermore, not only the above-mentioned general feed sewing machine but also a general sewing machine feed mechanism is shown by a solid line P in FIG.
As shown in, the number of feeds per one needle (one rotation of the upper shaft) is one, and one needle includes a pause period that is almost the same as the feed period. The inclination of the solid line P in the feed period becomes steep, and therefore, there is a problem in that the operator cannot follow the sewn product at a large speed when performing curved sewing at a high speed or at a large pitch, for example.

Here, there is known a sewing machine feed mechanism in which two rollers are used in place of the feed dog, and these rollers are intermittently moved by a one-way clutch so as not to be synchronized with each other to continuously feed the sewn product. However, there is a drawback that the feed force of the roller is weaker than that of the lower feed dog, and therefore there is a problem that the usable process is limited, which is not preferable.

Therefore, a first object of the present invention is to provide a sewing machine feed mechanism capable of compensating for the shortage of the upper feed amount due to the upper feed foot by the differential feed by the presser foot, and improving the product quality. And

It is a second object of the present invention to provide a sewing machine feed mechanism which enables continuous feeding of a sewn product, minimizes a change in the speed of the sewn product, and enables good sewing.

[0010]

In order to achieve the above object, the feed mechanism of the sewing machine of the present invention undergoes a predetermined swing motion to move the upper feed foot and the presser foot up and down substantially in opposite phases. A needle bar that includes a mechanism and a sewing needle and that moves up and down in synchronization with the upper feed foot; and a needle bar swinging unit that supports the needle bar and the upper feed foot so as to swing up and down, and Presser foot,
And a presser foot oscillating means for oscillating up and down and oscillating in an approximately opposite phase with respect to the upper feed foot.

[0011]

According to the feed mechanism of the sewing machine in such means, when two sewn products are piled up, for example, the upper feed foot and the feed dog are synchronized, the sewing machine needle descends and the upper cloth and the lower cloth are sewn. When the cloth is pierced, the upper cloth and the lower cloth are clamped from above and below by the upper feed foot and the feed teeth in synchronization with this, and the upper feed foot and the feed teeth cooperate to feed them together in the feeding direction. The presser foot is oscillated in an opposite phase with respect to the upper feed foot by the mechanism for vertically moving the upper feed foot and the presser foot in a substantially opposite phase while floating from the upper cloth. When the sewing machine needle rises and is pulled out from the upper cloth and lower cloth, the upper feed foot and feed dog oscillate while returning from the upper cloth and lower cloth to return to their original positions in synchronization with this. The foot descends by the above mechanism to press the upper cloth, and at the same time, the pressing foot swinging means swings in an opposite phase to the upper feed foot, so that only the upper cloth is fed in the feeding direction.

Further, if one sewing product is used and the upper feed foot and the feed dog are synchronized with each other, the feed by the cooperation of the sewing machine needle, the upper feed foot and the feed tooth and the feed by the presser foot are repeated. As a result, the sewn product is continuously fed, and the speed change of the sewn product is reduced.

Further, for example, if the presser foot and the feed dog are synchronized, the sewing machine needle and the upper feed foot are repeatedly fed, and the feed by the cooperation of the presser foot and the feed tooth is repeated, so that the sewn product is continuously formed. The change in speed of the sewn product is reduced.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an integrated feeding sewing machine to which a sewing machine feeding mechanism according to a first embodiment of the present invention is applied.

In the figure, reference numeral 1 indicates an upper shaft rotatably supported by a bearing (not shown).
An upper feed cam 26, which is an eccentric cam, is fixedly installed in the. One end of an upper feed swing lot 27 is slidably engaged with the upper feed cam 26, and the upper end of an upper feed swing arm (rear) 28 is attached to the other end of the upper feed swing lot 27. Is pivotally attached. A shaft 50 is connected to the lower end of the upper feed swing arm (rear) 28, and the shaft 50 is rotatably supported.

The upper end of an upper feed swing arm (front) 29 is connected to this side of the shaft 50 in the drawing, and an upper feed swing link is connected to the lower end of the upper feed swing arm (front) 29. One end of 30 is pivotally attached. One end of a bell crank 31, which is a triangular bar, is pivotally attached to the other end of the upper feed swing link 30. One end of a bell crank support link 36 is pivotally attached to the crotch portion of the bell crank 31, and the other end of the bell crank support link 36 is pivotally attached to the sewing machine head 54 side. An upper feed spring 37 is arranged between the bell crank support link 36 and the upper portion of the sewing machine head. The upper feed spring 37 presses the bell crank support link 36 downward with the other end as a fulcrum. It is in a state. An upper end of a connecting link 32 is pivotally attached to the other end of the bell crank 31, and an upper end of an upper feed rod 34 is pivotally attached to a lower end of the connecting link 32. An upper feed leg 35 is fixed to the lower end of the upper feed rod 34.

By the way, the upper end of the connecting link 33 is also pivotally attached to the crotch portion of the bell crank 31, and the upper end of the presser bar 24 is pivotally attached to the lower end of the connecting link 33. The presser foot 25 is fixed to the lower end of the presser bar 24.

On the other hand, FIG. 2 shows a configuration diagram of a needle bar swinging means 60 for swinging a needle bar and an upper feed foot, which will be described later, and a swing drive mechanism 62 of a presser foot swinging means 61 for swinging the presser foot. It is shown. In the figure, reference numeral 5 indicates a lower shaft rotatably supported by a bearing (not shown), and a horizontal feed cam 6 as an eccentric cam is fixedly mounted on the lower shaft 5. One end of a horizontal feed lot 7 is slidably engaged with the horizontal feed cam 6, and the lower end of a horizontal feed arm 8 is pivotally attached to the other end of the horizontal feed lot 7. A horizontal feed shaft 9 is connected to the upper end of the horizontal feed arm 8, and the horizontal feed shaft 9 is rotatably supported by a bearing (not shown).

One end of an upper feed arm (lower) 10 is connected to the other side of the horizontal feed shaft 9 in the figure, and the lower end of the upper feed lot 11 is connected to the other end of this upper feed arm (lower) 10. It is pivotally attached. One end of an upper feed arm (upper) 12 is pivotally attached to the upper end of the upper feed lot 11, and an upper feed shaft 20 is connected to the other end of the upper feed arm (upper) 12.
The upper feed shaft 20 is rotatably supported by a bearing (not shown), and a needle feed cam 13 as an eccentric cam is fixed to the upper feed shaft 20. An upper end of a needle feed lot 14 is slidably engaged with the needle feed cam 13, and one end of a needle feed arm 15 is pivotally attached to a lower end of the needle feed lot 14. A needle feed shaft 16 is connected to the other end of the needle feed arm 15, and the needle feed shaft 16 is rotatably supported by a bearing (not shown).

As shown in FIG. 1, an upper end portion of a needle bar rocking base 17 is connected to this side of the needle feed shaft 16 in the drawing, as shown in FIG. In the lower part of the needle bar rocking base 17, two slide holes (not shown) penetrating the lower part 17a in the vertical direction are formed.
The needle bar 19 including the upper feed bar 34 and the sewing machine needle 51 is in a loosely fitted state.

Further, as shown in FIG. 1, an upper end portion of an upper feed arm (front) 21 is connected to this side of the upper feed shaft 20 shown in FIG. 2 in the drawing. The upper feed arm (front) 21 has a channel shape having a slide groove, and one end of the upper feed swing link 22 is provided in the middle of the slide groove by a step screw 55 in the longitudinal direction of the slide groove (see FIG. 1). In the up and down direction) the position is adjustable.

At the other end of the upper feed swing link 22, one end of an L-shaped presser bar swing base 23 is pivotally attached, and the crotch portion of the presser bar swing base 23 is a sewing head 54. It is rotatably supported on the side. The other end portion 23a of the presser bar rocking base 23 is provided with one slide hole (not shown) penetrating the other end portion 23a in the vertical direction, and the presser bar 24 is loosely fitted in the slide hole. It is in the state of being

The reference numeral 52 in FIG.
Reference numerals 3 denote feed dogs that perform an elliptic motion, and in FIGS. 1 and 2, the hatched shafts indicate rotatably supported shafts.

Next, the operation of the integrated feed sewing machine thus configured will be described below. First, a description will be given with reference to FIG. When the upper shaft 1 rotates, this rotary motion is converted into a reciprocating linear motion by the upper feed cam 26 and the upper feed swing lot 27, and the upper feed swing arm (rear) 28 swings. The shaft 50 connected to the feed swing arm (rear) 28 also swings. The swing motion of the shaft 50 is converted into a reciprocating linear motion by the upper feed swing arm (front) 29 and the upper feed swing link 30.

If the upper feed swing link 30 is pushed rightward in the figure, for example, the presser bar 24 and the presser foot 25 descend and the presser foot 25 lands and is in the state shown in FIG. Becomes

From this state, when the upper feed swing link 30 is pushed further to the right, the presser foot 25 has landed and cannot descend any further, so the bell crank 3
1 rotates clockwise around the crotch portion of the bell crank 31 as a fulcrum, the upper feed rod 34 and the upper feed foot 35 descend, and this time the upper feed foot 35 lands.

When the upper feed swing link 30 is pushed further to the right from this state, the upper feed foot 35 has landed and cannot descend further, so the bell crank 31 is the other end of the bell crank 31. It rotates clockwise around the fulcrum, and the presser bar 24 and the presser foot 25 rise.

Next, when the swinging direction of the shaft 50 is reversed and the upper feed swinging link 30 is pulled back to the left in the figure from the above state, the bell crank 31 is reversed with the other end of the bell crank 31 as a fulcrum. As it rotates in the clockwise direction, the presser bar 24 and the presser foot 25 descend, and this time the presser foot 25 lands.

From this state, when the upper feed swing link 30 is further pulled back to the left, the presser foot 25 has landed and cannot descend further, so the bell crank 3
1 rotates counterclockwise with the crotch portion of the bell crank 31 as a fulcrum, and the upper feed rod 34 and the upper feed foot 35
Rises.

Then, from this state, the upper feed swing link 3
When 0 is further pulled back to the left, it returns to the original state, and these operations are repeated. That is, the upper feed foot 35
The presser foot 25 and the presser foot 25 are moved up and down in a substantially opposite phase by the bell crank 31, and are alternately landed so that the sewing material can be pressed down. The needle bar 19 moves up and down substantially in synchronization with the upper feed foot 35.

Next, the operation of the needle bar rocking means 60 and the presser foot rocking means 61 will be described. First, a description will be given with reference to FIG. When the lower shaft 5 rotates, this rotary motion is converted into a reciprocating linear motion by the horizontal feed cam 6 and the horizontal feed lot 7, and the horizontal feed arm 8 swings and is connected to this horizontal feed arm 8. The horizontal feed shaft 9 also swings. The swing motion of the horizontal feed shaft 9 is caused by the upper feed arm (lower) 10
And converted to reciprocating linear motion by the upper feed lot 11,
The upper feed arm (upper) 12 swings, and the upper feed shaft 20 connected to this upper feed arm (upper) 12 also swings. That is, the horizontal feed shaft 9 and the upper feed shaft 20 interlock with each other to perform a swinging motion.

The swing motion of the upper feed shaft 20 is caused by the needle feed cam 13
And converted to reciprocating linear motion by needle feed lot 14,
The needle feed arm 15 swings, and the needle feed shaft 16 connected to the needle feed arm 15 also swings.

Next, referring to FIG. 1, when the needle feed shaft 16 swings, the needle bar swing base 17 swings around the needle feed shaft 16 as a fulcrum, and thus the upper feed rod 34 and the needle. The rod 19 also swings. This swing motion is synchronized with the elliptical feed motion of the feed dog 53.

On the other hand, when the upper feed shaft 20 swings, this swinging motion causes an upper feed arm (front) 21 and an upper feed swing link 22.
Is converted into a reciprocating linear motion, and the presser bar swing base 23 swings around the crotch portion as a fulcrum. If the needle feed shaft 16 and the upper feed shaft 20 are oscillating clockwise, for example, the needle bar oscillating base 17 oscillates clockwise and the presser bar oscillating base 23 oscillates counterclockwise. Move dynamically.
Therefore, the rocking motions of the needle bar rocking base 17 and the presser bar rocking base 23 are in opposite phases.

As described above, the needle bar 19 and the upper feed foot 3 are provided.
5 (upper feed rod 34) and presser foot 25 (presser rod 24)
Performs a vertical motion and a rocking motion, so that in reality, the vertical motion and the rocking motion are combined.

Hereinafter, the actual movements synthesized as described above will be described with reference to FIG. First, as shown in FIG. 3 (a), the upper cloth A and the lower cloth B on which the sewing machine needle 51 is lowered and overlapped.
And the upper feed foot 35 descends at the same time. At this time, the upper cloths A and B are clamped between the upper feed foot 35 and the feed dog 53 that has been oscillated and moved upward.

Then, as shown in FIG. 3B, the upper feed foot 35 presses the upper and lower cloths A and B, and at the same time, the presser foot 25 starts to separate from the upper cloth A. At this time, the needle bar rocking base 17
Is started, and the sewing machine needle 51 and the upper feed foot 35 are rocked to the left in the figure. Therefore, the upper and lower cloths A and B are fed to the left side in the figure by the cooperation of the upper feed foot 35 and the feed dog 53 while being pierced by the sewing machine needle 51. At this time, the presser bar swing base 23 also starts to swing, and the presser foot 25 swings in the direction opposite to the upper feed foot 35, that is, in the right direction in the figure, while being separated from the upper cloth A.

Then, as shown in FIG. 3 (c), the upper and lower cloths A and B are formed by the cooperation of the upper feed foot 35 and the feed dog 53.
When the feeding movement of the sewing machine is completed, the sewing machine needle 51
Start to get out of B. At this time, the presser foot 25 descends and presses the upper cloth A.

Next, as shown in FIG. 3 (d), at the same time when the presser foot 25 presses the upper cloth A, the upper feed foot 35 and the feed dog 53 start to separate from the upper and lower cloths A and B, and At the same time, the swing of the presser bar swing base 23 and the needle bar swing base 17 is reversed. Therefore, by swinging the presser foot 25 to the left in the figure, only the upper cloth A is fed to the left side in the figure, and during this time, the sewing machine needle 51, the upper feed foot 35, and the feed dog 53 move upward and downward. The cloths A and B swing while separating from each other, and return to the initial position shown in FIG. Then, these operations are continuously repeated.

As described above, in the first embodiment, the bell crank 31 for vertically moving the upper feed foot 35 and the presser foot 25 in a substantially opposite phase by receiving a predetermined swing motion and the sewing machine needle 51 are provided. , A needle bar 1 that moves up and down in synchronization with the upper feed foot 35
9, a needle bar swinging means 60 for vertically swingably supporting and swinging the needle bar 19 and the upper feed foot 35, and a presser foot 25.
And a presser foot oscillating means 61 for oscillating up and down and oscillating in an almost opposite phase with respect to the upper feed foot 35,
Further, since the upper feed foot 35 and the feed dog 53 are synchronized with each other, for example, when two upper and lower cloths A and B are used, the shortage of the upper feed amount due to the upper feed foot 35 is reduced. This can be compensated by the differential feed by the presser foot 25. Therefore, the bending of the lower cloth B, which has occurred conventionally, does not occur, and the product quality can be improved.

Further, as described above, the feeding by the cooperation of the sewing machine needle 51, the upper feed foot 35, and the feed dog 53, and the presser foot 25.
Since the feeding by means is alternately repeated, when one sewn product is used, the sewn product is continuously fed. Therefore, as shown by the dotted line Q in FIG. 6, the inclination of the feed can be made gentler than in the conventional case. Therefore, the change in speed of the sewn product becomes as small as possible, and good sewing can be performed, for example, when performing curve sewing at high speed or at a large pitch.

If it is desired to adjust the feed amount by the presser foot 25, one end of the upper feed swing link 22 may be moved within the slide groove of the upper feed arm (front) 21. If one end of the upper feed swing link 22 is slid and fixed, the feed amount can be reduced, and if it is slid down and fixed, the feed amount can be increased.

FIG. 4 is a block diagram of the swing drive mechanism of the needle bar swinging means and the presser foot swinging means of the feed mechanism of the sewing machine showing the second embodiment of the present invention.

The difference of the sewing machine feed mechanism of the second embodiment from that of the first embodiment is that one end of the upper feed arm (lower) 10 is rotated 180 ° with respect to the first embodiment so that it is horizontal. This is the point connected to the feed shaft 9. That is, the phases of the presser foot 25, the sewing machine needle 51, and the upper feed foot 35 with respect to the feed dog 53 are shifted by 180 ° with respect to those of the first embodiment. The presser foot 25 is adapted to be synchronized. The sewing machine needle 51 is adapted to move up and down in synchronization with the upper feed foot 35, and the position of the feed dog 53 is set in the same manner as in the first embodiment in order to avoid interference with the sewing machine needle 51. It is provided on the side of the needle 51, not directly below it.

The operation will be described below with reference to FIG. First, as shown in FIG. 5A, the sewing machine needle 51 descends to pierce the overlapped upper cloth A and lower cloth B, and at the same time, the upper feed foot 35 descends. At this time, the feeding with the upper and lower cloths A and B sandwiched between the presser foot 25 and the feed dog 53 is completed.

Then, as shown in FIG. 5B, the upper feed foot 35 presses the upper and lower cloths A and B, and at the same time, the presser foot 25 separates from the upper cloth A and the feed dog 53 moves the lower cloth B. Start to leave. At this time, the swing of the needle bar swing base 17 is started, and the sewing machine needle 51 and the upper feed foot 35 swing to the left in the drawing. Therefore, the upper and lower cloths A and B are stabbed by the sewing machine needle 51 and are sent to the left side in the drawing by the upper feed foot 35 and the sewing machine needle 51. At this time, the presser bar swing base 23
Swinging of the presser foot 25 and the feed dog 53 is
While moving away from B, it swings in the direction opposite to the upper feed foot 35, that is, in the right direction in the drawing.

Next, as shown in FIG. 5 (c), when the feeding movement of the upper and lower cloths A and B by the upper feed foot 35 and the sewing machine needle 51 is completed, the sewing machine needle 51 is moved to the upper and lower cloths A and B. Begins to break out. At this time, the presser foot 25 descends and the upper cloth A
Hold down. Further, the feed dog 53 rises, and the feed dog 53
And the presser foot 25, the upper and lower cloths A and B are clamped.

Next, as shown in FIG. 5 (d), the presser foot 25 presses the upper cloth A, and at the same time, the upper feed foot 35 starts to separate from the upper and lower cloths A and B, and at the same time, the presser bar swings. The swings of the moving table 23 and the needle bar swinging table 17 are reversed.
Therefore, when the presser foot 25 and the feed dog 53 swing to the left in the figure and cooperate with each other, the upper and lower cloths A and B are fed to the left side in the figure, and the sewing machine needle 51 and The upper feed foot 35 swings while separating from the upper and lower cloths A and B, and returns to the initial position shown in FIG. Then, these operations are continuously repeated.

As described above, in the second embodiment, the presser foot 25 is synchronized with the feed dog 53 (in the first embodiment, the sewing machine needle 51 and the upper feed foot 3).
5 are synchronized), the feed by the sewing machine needle 51 and the upper feed foot 35, and the feed by the cooperation of the presser foot 25 and the feed dog 53 are repeated, and the upper and lower cloths A and B are continuously fed. It is designed to be used. Therefore, as shown by the dotted line Q in FIG. 6, the inclination of the feed can be made gentler than in the conventional case. Therefore, the change in speed of the sewn product becomes as small as possible, For example, it is possible to perform good sewing when performing curved sewing at high speed or at a large pitch.

In the second embodiment, an example is described in which two sheets are stacked and the lower cloths A and B are used, but the same effect can be obtained even with a single sheet.

Although the invention made by the present inventor has been specifically described based on the embodiments, the invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say, for example, in the above embodiment, the V-shaped bell crank 31
However, a triangular bell crank may be used, and any mechanism that vertically moves the upper feed foot and the presser foot in substantially opposite phases may be used.

It is also possible to use a feed roller instead of the feed dog 53.

[0053]

As described above, according to the feed mechanism of the sewing machine of the present invention, the mechanism for vertically moving the upper feed foot and the presser foot in substantially opposite phases upon receiving a predetermined swing motion, and the sewing machine. A needle bar that moves up and down in synchronism with the upper feed foot, a needle bar swinging unit that swings the needle bar and the upper feed foot so as to move up and down, and the presser foot. Since the presser foot oscillating means for vertically movably supporting and oscillating in a substantially opposite phase with respect to the upper feed foot is used, two stitched products are used, for example, the upper feed foot and the feed dog. If the sewing machine needle descends and penetrates the upper cloth and the lower cloth, the upper cloth and the lower cloth are clamped from above and below by the upper feed foot and the feed dog, and It is fed together in the feeding direction by cooperation with the feed dog, but at this time, the presser foot is almost inverted with the upper feed foot and the presser foot In the mechanism for vertically moving in a state of being floated from the upper cloth, and swing in opposite phase to the top feed foot by pressing AshiYurado means. When the sewing machine needle rises and is pulled out from the upper cloth and the lower cloth, the upper feed foot and the feed dog oscillate while returning from the upper cloth and the lower cloth to return to their original positions in synchronization with this.
At this time, the presser foot descends by the above mechanism to press the upper cloth, and at the same time, the presser foot swinging means swings in an opposite phase to the upper feed foot, so that only the upper cloth is fed in the feeding direction. Therefore, the shortage of the upper feed amount due to the upper feed foot can be compensated by the differential feed due to the presser foot, and, for example, the bending of the lower cloth that has conventionally occurred is eliminated, and the product quality can be improved.

Further, if one sewing piece is used and the upper feed foot and the feed dog are synchronized with each other, the feed by the cooperation of the sewing machine needle, the upper feed foot and the feed tooth and the feed by the presser foot are repeated. As a result, the sewn product is continuously fed, and thus the speed change of the sewn product is reduced, and good sewing can be performed.

Furthermore, if, for example, the presser foot and the feed dog are synchronized with each other, the feed by the sewing machine needle and the upper feed foot and the feed by the cooperation of the presser foot and the feed tooth are repeated, so that the sewn product is continuous. Therefore, the change in speed of the sewn product is reduced, and good sewing can be performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an integrated feed sewing machine to which a sewing machine feed mechanism according to a first embodiment of the present invention is applied.

FIG. 2 is a configuration diagram of a swing drive mechanism of the needle bar swinging means and the presser foot swinging means of the first embodiment.

FIG. 3 is an enlarged view of a main part of the feed mechanism of the sewing machine, which illustrates the operation of the first embodiment.

FIG. 4 is a configuration diagram of a rocking drive mechanism of a needle bar rocking means and a presser foot rocking means of a feed mechanism of a sewing machine showing a second embodiment of the present invention.

FIG. 5 is an enlarged view of the essential parts of the feed mechanism of the sewing machine, showing the operation of the second embodiment.

FIG. 6 is a diagram showing the relationship between the rotational speed of the upper shaft and the feed pitch in comparison with the related art.

FIG. 7 is a perspective view of a sewn product showing a problem of the conventional technique.

[Explanation of symbols]

19 Needle bar 25 Presser foot 31 Mechanism for vertically moving the upper feed foot and the presser foot in opposite phases (bell crank) 35 Upper feed foot 51 Sewing needle 60 Needle bar swinging means 61 Presser foot swinging means

Claims (1)

[Claims] 1. A needle bar which is provided with a mechanism for vertically moving an upper feed foot and a presser foot in substantially opposite phases in response to a predetermined swing motion and a sewing machine needle, and which moves up and down in synchronization with the upper feed foot. A needle bar oscillating means for vertically movably supporting and oscillating the needle bar and the upper feed foot; and vertically supporting the presser foot and having an approximately opposite phase to the upper feed foot. Presser foot swinging means to swing with
A sewing machine feed mechanism equipped with.