JP2006167032A - Upper feeding device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an upper feeding device of sewing machine which does not require any replacing of connecting members and can be applied to a variety of objects to be sewn. <P>SOLUTION: The upper feeding device 1 of sewing machine is provided with an upper feeding leg 3 which moves in a specified direction and feeds the object to be sewn while being in contact with the object placed on a needle plate 2 from above, a holding leg 4 which holds form the above the object towards the needle plate 2, a first operation mechanism 5 which causes reciprocating movements in up and down directions of the upper feeding leg 3 and the holding leg 4 in opposite phases against each other, and a second operation mechanism 9 which causes reciprocating movements of the upper feeding leg 3 in a prescribed direction. The upper feeding device of sewing machine is equipped with a connecting member 6 with the first operation mechanism 5 connected to a shaking mechanism 8 which connected to an upper axis 18 at a first connecting position 11, connected to the upper feeding leg 3 at a second connecting position 12, and connected to the holding leg 4 at a third connecting position 13. The connecting member 6 is composed in a way that the first connecting position 11 is adjustable against the second connecting position 12 and the third connecting position 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a top feed device for a sewing machine.

Conventionally, a sewing machine that performs piping sewing or the like has been provided with an upper feed leg that feeds the sewing product in the feeding direction and a presser leg that presses the sewing product against the throat plate, and these are reciprocated in the vertical direction at opposite phases. It is connected to a vertical drive mechanism so as to move. Further, the needle bar to which the sewing needle is attached and the upper feed leg are connected to a swing mechanism that swings in the feed direction of the sewing product. Then, the work to be sewn is held between the feed dog and the upper feed leg provided on the sewing machine bed, and the needle bar and the upper feed leg are operated by the swing mechanism and the operation of the feed dog while the sewing needle is inserted into the work to be sewn. Are to be fed in the feed direction. In this feeding process, the presser foot is lifted from the sewing product when the sewing product is fed, and when the upper feed leg returns to the position before sending the sewing product after the sewing product has been fed, The workpiece is pressed (for example, see Patent Document 1).
Here, as shown in FIGS. 5 and 7, the vertical drive mechanisms 100, 200 have the upper shafts 105, 205 mounted on the upper shafts 105, 205 in order to move the upper feed legs 101, 201 and the holding legs 102, 202 up and down in opposite phases. There are provided connecting members 103 and 203 for transmitting the driving force transmitted from the connected swinging mechanisms 104 and 204 to the upper feed legs 101 and 201 and the holding legs 102 and 202.

  As shown in FIG. 5, the connecting member is formed in a substantially L shape, and the distance from the connecting portion 103 a to the swing mechanism 104 to the connecting portion 103 b to the holding leg 102 and the connection to the swing mechanism 104. Some of the distances from the portion 103a to the connecting portion 103c with the upper feed leg 101 are different. FIG. 6 is a diagram showing a trajectory with respect to each rising amount of the upper feed leg 101 when the substantially L-shaped connecting member 103 is used. While the trajectory is in contact with the X axis (the value of the Y axis is 0). Is the distance L1 at which the workpiece can be sent. As described above, when the connecting member 103 shown in FIG. 5 is used, the upper feed leg 101 can be rapidly raised as shown in FIG. 6, so that it can flexibly cope with the change in the thickness of the sewing product. On the other hand, the distance from the connecting portion 103a to the swing mechanism 104 to the connecting portion 103c to the upper feed leg 101 is larger than the distance from the connecting portion 103a to the swing mechanism 104 to the connecting portion 103b to the holding leg 102. Since it is long, the force transmitted to the upper feed leg 101 is weakened.

As another connecting member, as shown in FIG. 7, it is formed in a substantially isosceles triangle shape, and the distance from the connecting portion 203a to the swinging mechanism 204 to the connecting portion 203b to the holding leg 202, and the swinging In some cases, the distance from the connecting portion 203a to the mechanism 204 to the connecting portion 203c to the upper feed leg 201 is substantially equal. FIG. 8 is a diagram showing a trajectory with respect to each rising amount of the upper feed leg 201 when the connecting member 203 having a substantially isosceles triangle shape is used. While the trajectory is in contact with the X axis (the value of the Y axis is 0). Is the distance L2 at which the workpiece can be sent. Thus, when the connecting member 203 shown in FIG. 7 is used, as shown in FIG. 8, the distance from the connecting portion 203a to the swing mechanism 204 to the connecting portion 203c to the upper feed leg 201, and the swing mechanism 204 Since the distance from the connecting portion 203a to the connecting portion 203b with the holding leg 202 is substantially equal, the force transmitted to the connecting portion 203a with the upper feed leg 201 is substantially equal to the force applied to the connecting portion 203b with the holding leg 202. Thus, a sufficient force can be transmitted to the upper feed leg 201, but the upper feed leg 201 cannot be rapidly raised, and the change in the thickness of the sewing product cannot be sufficiently handled.
Therefore, conventionally, either an upper feed device having one connecting member is used, or the connecting member is appropriately replaced according to the sewing object.
JP-A-7-136363

  However, there is a problem that the type of the sewing product that can be applied to the upper feed device is limited only by using the upper feed device having one of the connecting members. Further, when the connecting member is appropriately replaced according to the sewing object, it is difficult to adjust the connecting position of the swing mechanism or the like at the time of the replacement work.

  Accordingly, the present invention has been made to solve the above-described problem, and an object thereof is to provide an upper feed device for a sewing machine that can be applied to a wide variety of sewing objects while eliminating the need to replace a connecting member. And

In order to solve the above-described problems, the invention according to claim 1 includes an upper feed leg that moves in a predetermined direction while being in contact with the workpiece on the needle plate from above, and sends the workpiece. A presser foot that presses the workpiece toward the needle plate from above; a first operating mechanism that causes the upper feed leg and the presser leg to reciprocate in the vertical direction opposite to each other; and the upper feed A second operating mechanism that reciprocates in a predetermined direction with respect to the leg, wherein the first operating mechanism is coupled to a swing mechanism coupled to the upper shaft at a first coupling position, A sewing machine having a connecting member connected to the upper feed leg at a connecting position and connected to the presser leg at a third connecting position, wherein the connecting member is connected to the second connecting position and the second connecting position. The first connection position with respect to the connection position of 3 is configured to be adjustable. And wherein the door.
Here, the upper shaft is a rotating shaft connected to the sewing machine motor, and drives the needle bar to which the sewing needle is attached in the vertical direction.
In addition, the predetermined direction refers to a direction in which the workpiece is sent during sewing.

According to the first aspect of the present invention, the first connecting position of the connecting member can be adjusted with respect to the second connecting position and the third connecting position. If the straight line connecting the connecting position, the second connecting position, and the third connecting position is formed into a substantially right triangle shape, the upper feed leg can be rapidly raised, so that the thickness of the sewing product can be flexibly changed. Can respond.
Further, by changing the position of the first connection position, the distance from the first connection position to the second connection position and the distance from the first connection position to the third connection position are substantially equal, When the straight line connecting the first connecting position, the second connecting position, and the third connecting position is formed into a substantially isosceles triangle shape, the force transmitted to the upper feed leg is substantially equal to the force transmitted to the holding leg. A sufficient force can be transmitted to the upper feed leg.
Therefore, since the connecting member has the advantages of the conventional connecting members only by adjusting the position of the first connecting position, there is no need to replace the connecting members as in the prior art, and a wide variety of sewing operations are performed. Can be applied to things.

  According to a second aspect of the present invention, in the upper feed apparatus of the sewing machine according to the first aspect, the connection member is a plurality of connection portions that are alternatively connected to the swing mechanism as the first connection position. It is characterized by having.

  According to the second aspect of the present invention, since the connecting member has a plurality of connecting portions, the connecting position with the swinging mechanism can be changed according to the type of the sewing product. It can be applied to a wide variety of workpieces without requiring member replacement.

  According to a third aspect of the present invention, in the upper feed device of the sewing machine according to the second aspect, the first connecting portion of the plurality of connecting portions is moved from the first connecting portion to the second connecting position. And a distance from the first connecting portion to the third connecting position are substantially equal, and the second connecting portion is connected to the second connecting portion and the second connecting position. And a straight line connecting the second connecting position and the third connecting position is provided at a substantially right angle.

According to the invention described in claim 3, the first connecting portion includes the distance from the first connecting portion to the second connecting position, and the distance from the first connecting portion to the third connecting position. Since the force transmitted to the upper feed leg is substantially equal to the force transmitted to the holding leg, a sufficient force can be transmitted to the upper feed leg.
Further, the second connecting portion is provided at a position where a straight line connecting the second connecting portion and the second connecting position and a straight line connecting the second connecting position and the third connecting position form a substantially right angle. Thus, the upper feed leg can be rapidly raised, so that it is possible to flexibly cope with a change in the thickness of the sewing product.

  According to a fourth aspect of the present invention, in the upper feed device of the sewing machine according to the third aspect, the swing mechanism includes a first connection hole connectable to the first connection portion, and the second connection. And a second connecting hole that can be connected to the portion, and the upper feed leg and the presser leg are on the same plane in a state where the swinging member and the connecting member are connected. When grounded, the first connecting hole and the first connecting portion coincide with each other, and the second connecting hole and the second connecting portion coincide with each other.

  According to the fourth aspect of the present invention, when the upper feed leg and the holding leg are grounded on the same plane in a state where the swing member and the connection member are connected, the first connection hole of the swing member and Since the first connecting portion of the connecting member matches and the second connecting hole of the swinging member matches the second connecting portion of the connecting member, the upper feed leg and the holding leg are There is no phase shift of movement. Thereby, it is not necessary to adjust the phase even if the connection position is changed, and the adjustment work of the connection position can be facilitated.

  According to the first aspect of the present invention, since the connecting member has the advantages of the conventional connecting member only by adjusting the position of the first connecting position, the connecting member can be replaced as in the prior art. It is not necessary and can be applied to a wide variety of sewing products.

  According to the second aspect of the present invention, it is not necessary to replace the connecting member as in the prior art, and it can be applied to a wide variety of sewing products.

  According to the third aspect of the present invention, the upper feed leg, the presser leg, and the swing mechanism can be coupled so as to flexibly cope with a change in the thickness of the sewing product. Further, the upper feed leg, the pressing leg, and the swing mechanism can be coupled so that a sufficient force can be transmitted to the upper feed leg.

  According to the fourth aspect of the invention, it is not necessary to adjust the phase even if the connection position is changed, and the adjustment work of the connection position can be facilitated.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode of a sewing machine top feed apparatus according to the present invention will be described below in detail with reference to the drawings.
<Configuration of top feed device of sewing machine>
As shown in FIGS. 1 to 3, the upper feed device 1 (hereinafter referred to as the upper feed device 1) of the sewing machine is in a predetermined direction, that is, in a state in which it is in contact with the workpiece on the needle plate 2 from above. With respect to the upper feed leg 3 that moves in the feed direction of the sewing product and feeds the sewing product, the presser leg 4 that presses the sewing product toward the needle plate 2 from above, and the upper feed leg 3 and the presser leg 4 A first operation mechanism 5 for reciprocating in the vertical direction opposite to each other, and a second operation mechanism 9 for reciprocating in the feed direction of the sewing product with respect to the upper feed leg 3 (see FIG. 3). , Is provided.

  The upper feed leg 3 includes a support bar 31 formed so as to extend in the vertical direction along the longitudinal direction of the needle bar 17 provided at the lower end of the sewing needle 16. The workpiece to be sewn placed on the throat plate 2 is pressed from above, and the sewed product is clamped by the feed dog 70 (see FIG. 4) protruding from the lower portion of the throat plate 2 at a predetermined timing. And the clamping member 32 which sends a to-be-sewn material in a feed direction is attached. The tip of the holding member 32, that is, the lower end of the upper feed leg 3 is curved so as to extend in the surface direction of the needle plate 2 from the vertical direction, and the lower surface of the portion that holds the sewing product against the needle plate 2 is It is formed in a sawtooth shape so as to sandwich the workpiece with the teeth. Further, the holding member 32 is formed with an insertion hole 32a for allowing the sewing needle 16 to pass therethrough.

  Here, the sewing needle 16 and the needle bar 17 will be described. The needle bar 17 is connected to an eccentric cam 19 provided at the tip of the upper shaft 18 via a link 20 so that the upper shaft 18 rotates around the axis. Accordingly, it operates in the vertical direction. The needle bar 17 is attached such that its longitudinal direction is along the vertical direction, and is disposed substantially parallel to the upper feed leg 3. A sewing needle 16 through which a thread is passed is attached to the lower end of the needle bar 17, and the needle bar 17 moves in the vertical direction, whereby the tip of the sewing needle 16 is formed in an insertion hole 32 a formed in the holding member 32. It is designed to pierce the workpiece through the sewing machine.

  The presser leg 4 is provided side by side with the upper feed leg 3 in the feed direction of the workpiece, and includes a support bar 41 formed to extend in the vertical direction along the longitudinal direction of the upper feed leg 3. A pressing member 42 is attached to the lower end of the support bar 41 for pressing the workpiece placed on the needle plate 2 from above. The front end of the pressing member 42, that is, the lower end portion of the pressing leg 4 is curved so as to extend from the vertical direction to the surface direction of the needle plate 2, and the portion that holds the sewing product against the needle plate 2 is divided into two forks. Has been.

The first operating mechanism 5 includes a connecting member 6 connected to the swing mechanism 8. As shown in FIG. 2, the connecting member 6 is formed in a quadrangular shape, and is rotatably connected to the swing mechanism 8 at a first connecting position 11 including two vertices. The connecting member 6 is rotatably connected to the upper feed leg 3 at a second connecting position 12 including one of the other two apexes. The connecting member 6 is rotatably connected to the presser leg 4 at a third connecting position 13 including the other apex of the other two apexes. Further, the connecting member 6 is urged downward directly or indirectly by an urging member (not shown) such as a spring.
The first connection position 11 includes two connections including a first connection portion 21 connected at one of the two vertices and a second connection portion 22 connected at the other of the two vertices. And is selectively connected to the swing mechanism 8. Thereby, the connection member 6 can adjust the first connection position 11 with respect to the second connection position 12 and the third connection position 13.

The first connecting portion 21 is at a position where the distance from the first connecting portion 21 to the second connecting position 12 and the distance from the first connecting portion 21 to the third connecting position 13 are substantially equal. Is provided. As a result, when the connecting member 6 is connected to the swing mechanism 8 by the first connecting portion 21, the connecting member 6 functions as an isosceles triangular link member.
The second connecting portion 22 is a position where a straight line connecting the second connecting portion 22 and the second connecting position 12 and a straight line connecting the second connecting position 12 and the third connecting position 13 form a substantially right angle. Is provided. As a result, when the connecting member 6 is connected to the swing mechanism 8 by the second connecting portion 22, the connecting member 6 functions as a right triangle link member.

The swing mechanism 8 is connected to an upper shaft 18 that outputs the drive of the sewing motor, and transmits the drive of the sewing motor from the upper shaft 18 to the first operating mechanism 5.
The swing mechanism 8 includes a swing shaft 81 connected to the upper shaft 18 via an eccentric cam (not shown), a transmission link 82 connected to one end of the swing shaft 81, and one end of the transmission link 82. And a swing link 83 as a swing member connected to one end and the other end connected to either the first connecting portion 21 or the second connecting portion 22.
The transmission link 82 is connected so that its longitudinal direction is along the vertical direction of the upper feed leg 3, and the swing link 83 is connected so that its longitudinal direction is substantially perpendicular to the transmission link 82.
A first connection hole 85 that can be connected to the first connection portion 21 of the connection member 6 is formed at the other end of the swing link 83 and is connected to the second connection portion 22 of the connection member 6. A possible second coupling hole 86 is formed. Further, when the upper feed leg 3 and the presser leg 4 are grounded on the same plane as the needle plate 2 while being connected to the connecting member 6, the swing link 83 is connected to the first connecting hole 85. While the 1st connection part 21 corresponds, it is connected so that the 2nd connection hole 86 and the 2nd connection part 22 may correspond.

As shown in FIG. 3, the second operation mechanism 9 causes the upper feed leg 3 and the needle bar 17 to reciprocate in the feed direction of the sewing product. ), A first lever 92 rotatably connected to the transmission member 91, and a second lever 93 rotatably connected to the first lever 92. And a tension member 94 rotatably connected to the second lever 93, and a swing frame 95 rotatably connected to the tension member 94.
The swing frame 95 is provided with a support portion 95a for supporting the upper feed leg 3 and the needle bar 17 in the vicinity of the connecting portion with the tension member 94, and the other end portion is rotatably attached to the head of the sewing machine or the like. It has been.

<Up / down movement of upper feed leg, presser leg and needle bar>
Next, the vertical movement of the upper feed leg 3, the presser leg 4, and the needle bar 17 will be described.
When the sewing machine motor is driven and the upper shaft 18 is rotated about the axis, the swing shaft 81 connected to the upper shaft 18 via an eccentric cam swings about the shaft. When the swing shaft 81 swings, one end of the transmission link 82 swings. As the transmission link 82 swings, the swing link 83 swings along the feed direction of the sewing product.

Here, if the swing link 83 is pushed rightward in FIG. 3, the presser leg 4 is lowered and landed on the workpiece.
If the swing link 83 is further pushed to the right from this state, the holding leg 4 is landed and cannot be lowered any further, so that the connecting member 6 rotates clockwise with the third connecting position 13 as a fulcrum. The upper feed leg 3 is lowered, and this time, the upper feed leg 3 is landed on the workpiece.
If the swing link 83 is pushed further to the right from this state, the upper feed leg 3 is landed and cannot be lowered any further, so that the connecting member 6 is watched with the second connecting position 12 as a fulcrum. It will turn around and the holding leg 4 will rise.

Next, when the swinging direction of the swinging shaft 81 is reversed and the swinging link 83 is pulled back to the left in FIG. 3, the connecting member 6 rotates counterclockwise with the second connecting position 12 as a fulcrum. As a result, the presser foot 4 is lowered and the presser foot 4 is landed on the workpiece.
If the swing link 83 is further pulled back to the left from this state, the presser leg 4 has landed and cannot be lowered any further, so that the connecting member 6 counterclockwise with the third connecting position 13 as a fulcrum. As a result, the upper feed leg 3 rises.
When the swing link 83 is further pulled back to the left from this state, the original state is restored and these operations are repeated. That is, the upper feed leg 3 and the presser leg 4 move up and down substantially in opposite phases, and are alternately landed to press the work to be sewn. The needle bar 17 moves up and down almost in synchronization with the upper feed leg 3.

<Oscillation of upper feed leg and needle bar>
Next, the swinging operation of the upper feed leg 3 and the needle bar 17 in the feed direction of the sewing product will be described.
When the upper shaft 18 rotates, the driving force is transmitted in the order of the transmission member 91, the first lever 92, and the second lever 93, and the tension member 94 is fed in the sewing product feed direction (left-right direction in FIG. 3). Rocks. As the tension member 94 swings, the swing frame 95 swings around the other end as a fulcrum, so that the upper feed leg 3 and the needle bar 17 supported by the support portion 95a are also synchronized with the swing of the swing frame 95. Rocks. The upper feed leg 3 and the needle bar 17 are swung in a predetermined timing with the vertical movement of the upper feed leg 3, the presser leg 4 and the needle bar 17, and the sewing is performed while feeding the workpiece in the feed direction. Can be done.

<Operation of top feed device>
Next, with reference to FIG. 4, the operation of the upper feed device 1 that combines the above operations will be described.
As shown in FIG. 4A, the sewing needle 16 is lowered to pierce the workpiece C, and at the same time, the upper feed leg 3 is lowered. At this time, the sewing product C is clamped between the clamping member 32 of the upper feed leg 3 and the feed dog 70 that has risen in an elliptical manner.
Next, as shown in FIG. 4B, the pressing member 42 of the pressing leg 4 starts to be separated from the sewing product C at the same time as the clamping member 32 presses the sewing product C. At this time, the swing of the needle bar 17 is started by the swing mechanism 8, and the sewing needle 16 and the clamping member 32 swing leftward in FIG. Accordingly, the workpiece C is fed to the left side in FIG. 4 in cooperation with the holding member 32 and the feed dog 70 while being stabbed into the sewing needle 16. Further, the swinging mechanism 8 starts swinging of the pressing member 42, and the pressing member 42 swings in the opposite direction to the clamping member 32, that is, in the right direction in FIG.

Next, as shown in FIG. 4C, when the feed movement of the sewing product C by the cooperation of the clamping member 32 and the feed dog 70 is finished, the sewing needle 16 starts to come off from the sewing product C. At this time, the pressing member 42 descends and presses the workpiece C.
Next, as shown in FIG. 4D, simultaneously with the pressing member 42 pressing the workpiece C, the holding member 32 and the feed dog 70 start to move away from the workpiece C, and at the same time, the pressing member 42 and the needle bar. The swings of 17 are reversed. Therefore, by swinging the presser member 42 in the left direction in FIG. 4, only the workpiece C is sent to the left side in FIG. 4, and during this time, the sewing needle 16, the clamping member 32, and the feed dog 70 are moved. It swings away from the sewn product C and returns to the initial position shown in FIG. These operations are then repeated.

<Effects of Embodiment>
According to the upper feed device 1 in the embodiment, since the connecting member 6 can adjust the position of the first connecting position 11 with respect to the second connecting position 12 and the third connecting position 13, the first connecting position. 11 and changing the position of the first connecting position 11 (second connecting portion 22), the second connecting position 12 and the third connecting position 13 into a substantially right triangle shape, the upper feed leg 3 Can be raised rapidly, so that it is possible to flexibly cope with changes in the thickness of the sewing object.
Further, by changing the position of the first connection position 11, the distance from the first connection position 11 (first connection portion 21) to the second connection position 12, and the first connection position 11 to the third connection. If the straight line connecting the first connecting position 11, the second connecting position 12, and the third connecting position 13 is made into a substantially isosceles triangle shape with the distance to the position 13 being substantially equal, the distance is transmitted to the upper feed leg 3. Since the applied force is substantially equal to the force transmitted to the presser leg 4, a sufficient force can be transmitted to the upper feed leg 3.
Therefore, since the connecting member 6 has the advantages of the conventional connecting member only by adjusting the position of the first connecting position 11, the connecting member 6 does not need to be replaced as in the prior art, and there are various types. It can be applied to the workpiece.

  Moreover, according to the upper feed device 1 in the embodiment, the first connecting position 11 includes the first connecting portion 21 and the second connecting portion 22, so that the connecting position with the swing mechanism 8 is set as the sewing object. Therefore, it is not necessary to replace the connecting member as in the prior art, and it can be applied to a wide variety of sewing products.

  Further, according to the upper feed device 1 in the embodiment, when the upper feed leg 3 and the pressing leg 4 are grounded on the same plane as the needle plate 2, the first connection hole 85 of the swing link 83. And the first connecting portion 21 of the connecting member 6 coincide with each other, and the second connecting hole 86 of the swing link 83 and the second connecting portion 22 of the connecting member 6 coincide with each other. The phase of the vertical movement of the feed leg 3 and the holding leg 4 is not shifted. Thereby, it is not necessary to adjust the phase even if the connection position is changed, and the adjustment work of the connection position can be facilitated.

  The present invention is not limited to the above embodiment. For example, the connecting member is not limited to having two connecting portions as the first connecting position, but may have three or more connecting portions. In the embodiment, the upper feed leg is disposed on the inner side and the presser leg is disposed on the outer side. However, the upper feed leg may be disposed on the outer side and the presser leg may be disposed on the inner side. Further, the upper feed leg and the needle bar are not necessarily driven in synchronism, and may be driven separately. In addition, the upper feed leg and the presser leg are not limited to be swingable, and the presser leg may only move up and down and not swing in the feed direction.

It is a perspective view of the upper feed apparatus of the sewing machine concerning the present invention. It is a disassembled perspective view of the upper feed apparatus of the sewing machine according to the present invention. It is a front view of the upper feed apparatus of the sewing machine concerning the present invention. It is a principal part enlarged view which shows operation | movement of the upper feed apparatus of the sewing machine which concerns on this invention. It is a perspective view of the upper feed apparatus of the sewing machine using the substantially L-shaped connection member in a prior art. It is a figure which shows the locus | trajectory of the upper feed leg in FIG. It is a perspective view of the upper feed apparatus of the sewing machine using the connection member of the substantially isosceles triangle shape in a prior art. It is a figure which shows the locus | trajectory of the upper feed leg in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper feed device 2 Needle plate 3 Upper feed leg 4 Holding leg 5 1st operation mechanism 6 Connection member 8 Swing mechanism 9 2nd operation mechanism 11 1st connection position 12 2nd connection position 13 3rd connection Position 21 First connecting portion 22 Second connecting portion 83 Oscillating link (oscillating member)
85 First connection hole 86 Second connection hole

Claims (4)

An upper feed leg that moves in a predetermined direction while in contact with the workpiece on the needle plate from above, and feeds the workpiece;
A presser foot that presses the sewing product toward the needle plate from above;
A first operating mechanism for causing the upper feed leg and the presser leg to reciprocate in the vertical direction opposite to each other;
A second operation mechanism that reciprocates in a predetermined direction with respect to the upper feed leg,
The first operating mechanism comprises:
It has a connecting member connected to the swing mechanism connected to the upper shaft at the first connecting position, connected to the upper feed leg at the second connecting position, and connected to the holding leg at the third connecting position. In the top feed device of the sewing machine,
An upper feed device for a sewing machine, wherein the connecting member is configured to be capable of adjusting the first connecting position with respect to the second connecting position and the third connecting position. The connecting member is
The upper feed device of the sewing machine according to claim 1, further comprising a plurality of connecting portions that are alternatively connected to the swing mechanism as the first connecting position. Among the plurality of connecting portions,
Providing the first connecting portion at a position where the distance from the first connecting portion to the second connecting position and the distance from the first connecting portion to the third connecting position are substantially equal;
The second connecting portion is provided at a position where a straight line connecting the second connecting portion and the second connecting position and a straight line connecting the second connecting position and the third connecting position form a substantially right angle. The upper feed device of the sewing machine according to claim 2, wherein the upper feed device is a sewing machine. The swing mechanism is
A swing member formed with a first connecting hole connectable to the first connecting portion and a second connecting hole connectable to the second connecting portion;
When the upper feed leg and the presser leg are grounded on the same plane in a state where the swing member and the connection member are connected, the first connection hole and the first connection portion coincide with each other. The upper feed device of the sewing machine according to claim 3, wherein the second connecting hole and the second connecting portion coincide with each other.

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