JP5845683B2 - sewing machine - Google Patents

Description

  The present invention relates to a sewing machine that drives a main shaft and a cloth feed mechanism with separate motors.

  There is a sewing machine that drives the main shaft and the cloth feed mechanism with different motors. Since the sewing machine can freely control the cloth feed amount, various patterns can be easily sewn. The sewing machine cloth feed control device disclosed in Patent Document 1 transmits the drive of a cloth feed motor, which is a stepping motor, to a feed base on which feed dogs are arranged via a link mechanism. When the drive shaft of the cloth feed motor reciprocates within a predetermined angle range, the feed base reciprocates in the cloth feed direction of the sewing machine by the link mechanism.

JP 54-92444 A

  In the conventional sewing machine, the reciprocating rotation of the drive shaft of the cloth feed motor and the reciprocating movement of the feed base have a one-to-one relationship. When the drive shaft of the cloth feed motor rotates in one direction or in the reverse direction, the feed base moves in one direction or in the reverse direction. Therefore, the conventional sewing machine has a problem that the rotation direction of the cloth feed motor has to be frequently switched and the load on the cloth feed motor becomes large.

  An object of the present invention is to provide a sewing machine that can reduce the switching frequency of the rotation direction of the cloth feed motor and reduce the load applied to the cloth feed motor.

  The sewing machine according to the first aspect of the present invention includes a first motor that rotates the first drive shaft within a range of a predetermined angle, a feed base that horizontally supports the feed dog, and one end that is first on the first drive shaft. The feed base is connected via a link mechanism, the other end is connected to the feed base via a first link member, and is rotated in conjunction with the rotation of the first drive shaft by the first motor. In the sewing machine provided with a horizontal feed shaft for giving a horizontal feed operation to the first link mechanism, the first link mechanism includes a horizontal working arm provided orthogonal to the one end side of the horizontal feed shaft, and the first drive shaft. The rotation in one direction and the opposite direction is converted into a swinging motion in which one end of the horizontal working arm is reciprocally swung around the horizontal feed shaft to transmit power to the horizontal feed shaft. 1 power transmission mechanism.

  In the sewing machine according to the first aspect, the first power transmission mechanism is configured to swing the one end of the horizontal working arm one reciprocatingly around the horizontal feed shaft by rotating the first drive shaft in one direction and the opposite direction. Converts to dynamic motion and transmits power to the horizontal feed shaft. When one end of the horizontal action arm swings one reciprocating motion, the horizontal feed shaft rotates one reciprocating motion. When the horizontal feed shaft is reciprocated once, the feed base is reciprocated once in the horizontal direction. Therefore, since the sewing machine according to the first aspect can convert the rotation of the first drive shaft in one direction and the opposite direction into one reciprocal horizontal movement of the feed base, the frequency of switching the rotation direction of the first motor is reduced. . The sewing machine of the first aspect can reduce the load applied to the first motor by reducing the switching frequency of the rotation direction of the first motor.

  In the sewing machine according to the first aspect, the first power transmission mechanism includes a first horizontal feed arm coupled perpendicularly to the first drive shaft, and a second horizontal coupled rotatably to the one end of the horizontal action arm. You may provide the 1st connection part which connects a feed arm, the said 1st horizontal feed arm, and the said 2nd horizontal feed arm so that rotation is possible. The first power transmission mechanism pivots the drive shaft of the first motor in one direction and in the opposite direction, and swings one end of the horizontal action arm one reciprocally through the first horizontal feed arm and the second horizontal feed arm. It is converted into a rocking motion. Therefore, the sewing machine can easily constitute the first power transmission mechanism by the two horizontal feed arms.

  In the sewing machine according to the first aspect, the position of the first connecting portion in which the first horizontal feed arm and the second horizontal feed arm are rotated and substantially collinear with each other by the rotation of the first drive shaft. May be configured to swing to both sides with the intermediate position at the center. In the sewing machine, the first connecting portion swings on both sides around an intermediate position where the first horizontal feed arm and the second horizontal feed arm are substantially collinear with each other. The sewing machine changes the swing direction of the horizontal action arm at an intermediate position. When the first drive shaft rotates, the moving direction of the feed base changes at an intermediate position. Therefore, the sewing machine can horizontally move the feed table one reciprocating motion with the intermediate position at the center by rotating the first drive shaft in one direction and in the opposite direction.

  In the sewing machine according to the first aspect, when the feed base is located at one end of the feed operation range in the horizontal direction, the first connecting portion may be located at the intermediate position. When the feed base starts to feed the cloth from one end of the feeding operation range, the load applied to the first motor becomes the largest at one end of the feeding operation range where the cloth starts to be fed. In the sewing machine, the first motor continues to rotate in one direction or in the opposite direction at an intermediate position. The sewing machine can start feeding the cloth while the first motor continues to rotate by setting the intermediate position to one end of the feed operation range of the feed base. Therefore, the sewing machine can reduce the load applied to the first motor when the feed base starts the cloth feed from one end of the feed operation range.

  In the sewing machine of the first aspect, the first power transmission mechanism is provided on the first drive shaft, and has at least one first convex portion on a curved surface corresponding to a rotation angle of the first drive shaft. A convex portion may include a first cam that acts on the one end of the horizontal action arm. The first power transmission mechanism reciprocally oscillates one end of the horizontal operating arm around the horizontal feed shaft by the first cam by rotating the drive shaft of the first motor in one direction and in the opposite direction. Therefore, the sewing machine can reduce the number of parts constituting the first power transmission mechanism.

  In the sewing machine according to the first aspect, the position at which the first cam is rotated by the rotation of the first drive shaft and the first convex portion is in contact with the one end of the horizontal action arm is within the predetermined angle range. When the intermediate position is set, the one end of the horizontal action arm may swing to both sides with the intermediate position as the center. The sewing machine swings on both sides with an intermediate position where the first convex portion contacts one end of the horizontal action arm as the center. The sewing machine changes the swing direction of the horizontal action arm at an intermediate position. When the first drive shaft rotates, the moving direction of the feed base changes at an intermediate position. Therefore, the sewing machine can horizontally move the feed table one reciprocating motion with the intermediate position at the center by rotating the first drive shaft in one direction and in the opposite direction.

  In the sewing machine according to the first aspect, when the feed base is located at one end of the horizontal feed operation range, the one end of the horizontal working arm may be located at the intermediate position. When the feed base starts to feed the cloth from one end of the feeding operation range, the load applied to the first motor becomes the largest at one end of the feeding operation range where the cloth starts to be fed. In the sewing machine, the first motor continues to rotate in one direction or in the opposite direction at an intermediate position. The sewing machine can start feeding the cloth while the first motor continues to rotate by setting the intermediate position to one end of the feed operation range of the feed base. Therefore, the sewing machine can reduce the load applied to the first motor when the feed base starts the cloth feed from one end of the feed operation range.

  In the sewing machine of the first aspect, a second motor that rotates the second drive shaft within a range of a predetermined angle, one end is connected to the second drive shaft via a second link mechanism, and the other end is connected to the feed base. And a vertical feed shaft that is connected via a second link member and rotates in conjunction with the rotation of the second drive shaft by the second motor to give a vertical feed operation to the feed base. The second link mechanism includes a vertical working arm provided orthogonal to the one end side of the vertical feed shaft, and a rotation of the second drive shaft in one direction and the opposite direction, respectively. And a second power transmission mechanism for transmitting power to the vertical feed shaft by converting it into a swinging motion in which one end of the vertical working arm is swung back and forth once. The second power transmission mechanism converts the rotation of the second drive shaft in one direction and in the opposite direction into a swinging motion that swings one end of the vertical working arm one reciprocating motion about the vertical feed shaft. Transmits power to the feed shaft. When one end of the vertical working arm is reciprocated once, the vertical feed shaft is reciprocated once. When the vertical feed shaft is reciprocated once, the feed base is reciprocated once in the vertical direction. Therefore, since the sewing machine according to the first aspect can convert the rotation of the second drive shaft in one direction and the opposite direction into one reciprocating vertical movement of the feed base, the frequency of switching the rotation direction of the second motor is reduced. be able to. The sewing machine of the first aspect can reduce the load applied to the second motor by reducing the frequency of switching the rotation direction of the second motor.

  In the sewing machine according to the first aspect, the second power transmission mechanism includes a first vertical feed arm connected perpendicularly to the second drive shaft, and a second vertical movement connected to the one end of the vertical action arm so as to be rotatable. You may provide the feed arm and the 2nd connection part which connects the 1st up-and-down feed arm and the 2nd up-and-down feed arm so that rotation is possible. The second power transmission mechanism pivots the drive shaft of the second motor in one direction and in the opposite direction, and swings one end of the upper and lower working arms one reciprocally through the first vertical feed arm and the second vertical feed arm. It is converted into a rocking motion. Therefore, the sewing machine can easily constitute the second power transmission mechanism by the two vertical feed arms.

  In the sewing machine according to the first aspect, the position of the second connecting portion in which the first vertical feed arm and the second vertical feed arm are rotated and substantially collinear with each other by the rotation of the second drive shaft. May be configured to swing to both sides with the intermediate position at the center. The sewing machine swings on both sides with an intermediate position where the second connecting portion is substantially on the same straight line as the first vertical feeding arm and the second vertical feeding arm. The sewing machine changes the swinging direction of the upper and lower working arms at an intermediate position. When the second drive shaft rotates, the moving direction of the feed base changes at an intermediate position. Therefore, the sewing machine can move the feed base up and down one reciprocating motion with the second drive shaft turning in one direction and the opposite direction around the middle position.

  In the sewing machine according to the first aspect, when the feed base is located at the lower end of the feed operation range in the vertical direction, the second connecting portion may be located at the intermediate position. When the feed base starts moving from the lower end of the feed operation range, the load applied to the second motor is the largest at the position where the cloth located between the lower end and the upper end of the feed operation range starts to be fed. In the sewing machine, the second motor continues to rotate in one direction or the opposite direction at an intermediate position. When the second motor continues to rotate from the intermediate position in one direction or in the opposite direction, the sewing machine moves to a position where the feed base starts feeding the cloth. The sewing machine can start feeding the cloth while the second motor continues to rotate. Therefore, when the sewing machine starts moving from the lower end of the feeding operation range, the sewing machine can reduce the load applied to the second motor when starting to feed the cloth.

  The sewing machine according to the second aspect of the present invention includes a second motor that rotates the second drive shaft at a predetermined angle, a feed base that horizontally supports the feed dog, and a second link mechanism that has one end connected to the second drive shaft. And the other end is connected to the feed table via a second link member, and is rotated in conjunction with the rotation of the second drive shaft by the second motor. In the sewing machine including a vertical feed shaft that imparts a feed operation in the direction, the second link mechanism includes a vertical working arm provided orthogonal to the one end side of the vertical feed shaft, and the second drive shaft. A second power transmission mechanism that converts the reciprocating rotation of a predetermined angle into a swinging motion that swings one end of the up and down action arm twice so as to transmit power to the up and down feed shaft.

  In the sewing machine of the second aspect, the second power transmission mechanism converts the reciprocating rotation of the second drive shaft at a predetermined angle into a swinging motion that reciprocally swings one end of the upper and lower working arms to the vertical feed shaft. Transmit power. When one end of the vertical working arm swings twice, the vertical feed shaft rotates twice. When the vertical feed shaft rotates twice, the feed base moves twice in the vertical direction. Therefore, since the sewing machine according to the second aspect can convert the reciprocating rotation of the second drive shaft into two reciprocating vertical movements of the feed base, the frequency of switching the rotation direction of the second motor can be reduced. The sewing machine of the 2nd mode can reduce the load concerning the 2nd motor by reducing the change frequency of the rotation direction of the 2nd motor.

The perspective view of the sewing machine 1. FIG. FIG. 3 is an enlarged perspective view in the vicinity of a sewing needle 8 and a needle plate 15. The perspective view of the cloth feed mechanism 30. FIG. The perspective view which shows the 1st state of the cloth feed mechanism. The perspective view which shows the 2nd state of the cloth feed mechanism. The perspective view which shows the 3rd state of the cloth feeding mechanism. The perspective view which shows the 1st state of the cloth feeding mechanism. The perspective view which shows the 2nd state of the cloth feeding mechanism. The perspective view which shows the 3rd state of the cloth feeding mechanism. The perspective view of the cloth feed mechanism 90. FIG. The figure which shows the flow of operation | movement of the power transmission mechanism. The figure which shows the continuation of FIG.

  Hereinafter, a sewing machine 1 according to a first embodiment of the present invention will be described with reference to the drawings. The configuration of the sewing machine 1 will be described with reference to FIGS. The upper side, lower side, right side, left side, front side, and rear side of FIG. 1 are the upper side, lower side, right side, left side, front side, and rear side of the sewing machine 1, respectively.

  The sewing machine 1 includes a bed 2, a pedestal 3, and an arm 4. The bed part 2 is a base of the sewing machine 1. The bed 2 is mounted from above on a recess (not shown) on the upper surface of the table 20. The pedestal 3 extends vertically upward from the right end of the bed 2. The arm portion 4 extends leftward from the upper end of the pedestal column portion 3. The arm part 4 faces the upper surface of the bed part 2. The arm portion 4 is provided with a presser foot 17 below the left end portion. The arm portion 4 holds a needle bar 7 therein. The needle bar 7 has a sewing needle 8 (see FIG. 2) attached to the lower end. The needle bar 7 and the sewing needle 8 reciprocate up and down as the main motor 13 is driven. The arm portion 4 includes a balance 9 in front of the left end portion. The balance 9 moves up and down in conjunction with the needle bar 7. The arm unit 4 includes an operation unit 10 at the top. The operation unit 10 includes a liquid crystal panel 11 on the front surface. The operator operates the operation unit 10 while looking at the liquid crystal panel 11 and inputs various instructions to the sewing machine 1.

  The sewing machine 1 includes a control device 25 on the lower surface of the table 20. The control device 25 is connected to the stepping pedal 22 via the rod 21. The operator operates the pedal 22 to the toe side or the heel side. The control device 25 controls the operation of the sewing machine 1 according to the operation direction and operation amount of the pedal 22.

  The pedestal 3 has a main motor 13 at the upper right side. The arm portion 4 includes a main shaft 14 inside. The main shaft 14 extends in the left-right direction inside the arm portion 4 in a rotatable state. The right end of the main shaft 14 is connected to the main motor 13. The left end of the main shaft 14 is connected to a needle bar vertical movement mechanism (not shown). The main motor 13 drives the main shaft 14 to move the needle bar 7 and the balance 9 up and down.

  As shown in FIG. 2, the bed portion 2 includes a needle plate 15 at the upper left end. The needle plate 15 has a needle hole 18 in a substantially central portion. The lower end of the sewing needle 8 passes through the needle hole 18 when lowered. The needle plate 15 is provided with a feed dog hole 19 on each of the left, rear and right sides of the needle hole 18. The feed dog hole 19 has a rectangular shape that is long in the front-rear direction. The bed portion 2 includes a shuttle mechanism (not shown) and a cloth feed mechanism 30 (see FIG. 3) below the needle plate 15.

  The configuration of the cloth feed mechanism 30 will be described with reference to FIG. The upper side, the lower side, the left rear side, the right front side, the right rear side, and the left front side of FIG. 3 are the upper side, the lower side, the right side, the left side, the front side, and the rear side of the sewing machine 1, respectively. As shown in FIG. 3, the cloth feed mechanism 30 includes a feed base 33, a feed dog 34, a cloth feed motor 35, a link mechanism 37, a horizontal feed shaft 28, a vertical feed shaft 27, an eccentric portion 39, a link member 50, and a link member. 51 is provided. The feed base 33 is located below the needle plate 15 (see FIG. 2) and is parallel to the needle plate 15. The feed base 33 supports three feed dogs 34 (see FIG. 4) near the center of the upper surface. Each of the feed dogs 34 corresponds to the position of the feed dog hole 19. Each of the feed dogs 34 is long in the front-rear direction. The length of the feed dog 34 in the front-rear direction is smaller than the length of the feed dog hole 19. The feed dog 34 is provided with irregularities for sandwiching the cloth with the presser foot 17 in the upper part.

  The cloth feed motor 35 is arranged on the right side of the feed base 33. The cloth feed motor 35 is a stepping motor. The cloth feed motor 35 moves the feed base 33 in the front-rear direction. The drive shaft 36 of the cloth feed motor 35 extends leftward. The drive shaft 36 rotates within a range of a predetermined angle.

  The link mechanism 37 includes a power transmission mechanism 40 and an intermediate action arm 38. The power transmission mechanism 40 includes a feed arm 41, a feed arm 42, and a connecting portion 45. One end of the feed arm 41 is attached perpendicular to the tip of the drive shaft 36 of the cloth feed motor 35. The other end of the feed arm 41 is rotatably connected to one end of the feed arm 42. The other end of the feed arm 42 is rotatably connected to the front end of the intermediate action arm 38 in the extending direction. A portion where the other end of the feed arm 41 and one end of the feed arm 42 are connected is a connecting portion 45. A portion where the other end of the feed arm 42 and the tip of the intermediate working arm 38 are connected is a connecting portion 46. When the drive shaft 36 reciprocally rotates, the connecting portion 45 reciprocates horizontally in the front-rear direction, and the connecting portion 46 reciprocates vertically. The intermediate working arm 38 is attached to the right end of the horizontal feed shaft 28 at the end opposite to the portion connected to the connecting portion 46. The intermediate working arm 38 is orthogonal to the longitudinal direction of the horizontal feed shaft 28 and extends rearward. The horizontal feed shaft 28 is rotatably provided on the upper left side of the cloth feed motor 35. The horizontal feed shaft 28 extends in the left-right direction. The lower end of the link member 50 is attached perpendicular to the left end portion of the horizontal feed shaft 28. The upper end of the link member 50 is rotatably connected to the front end portion of the feed base 33.

  The vertical feed shaft 27 is positioned parallel to the horizontal feed shaft 28. The vertical feed shaft 27 includes a pulley 24 at the right end. The pulley 24 is connected to the main shaft 14 by a timing belt (not shown). The vertical feed shaft 27 is rotated by driving the main motor 13 through a timing belt connected to the main shaft 14. Therefore, the vertical feed shaft 27 rotates in synchronization with the main shaft 14 of the sewing machine 1. The eccentric portion 39 is provided at the left end of the vertical feed shaft 27. The eccentric portion 39 is eccentric with respect to the axis of the vertical feed shaft 27. The link member 51 is rotatably provided at the rear end of the feed base 33. The link member 51 holds the eccentric part 39 rotatably. The eccentric portion 39 moves the feed base 33 up and down via the link member 51 by the rotation of the vertical feed shaft 27.

  Next, the operation | movement of the front-back direction of the cloth feed mechanism 30 is demonstrated with reference to FIGS. The operation of the cloth feed mechanism 30 in the front-rear direction has first to third states. The following description is about the positional relationship of each member when the cloth feed mechanism 30 is viewed from the left. Each of W <b> 1 to W <b> 3 in FIGS. 4 to 6 indicates the vicinity of the feed base 33.

[First state]
As shown in FIG. 4, in the power transmission mechanism 40, the feed arm 41 and the feed arm 42 are positioned on a straight line in the vertical direction. The connecting portion 46 is located at the top and above the connecting portion 45. The intermediate working arm 38 is substantially horizontal. The feed base 33 is located in the forefront. The feed dog 34 is located in the forefront of the feed dog hole 19. The cloth feed mechanism 30 is in the first state. In the present embodiment, the position of the connecting portion 45 when the feed arm 41 and the feed arm 42 are aligned in the vertical direction is the intermediate position.

[Second state]
As shown in FIG. 5, when the cloth feed motor 35 is driven from the first state, the drive shaft 36 rotates clockwise as viewed from the left side. The feed arm 41 rotates clockwise as the drive shaft 36 rotates. The connecting portion 45 moves from the intermediate position to the front position. The feed arm 41 and the feed arm 42 are bent in an approximately L shape forward from the connecting portion 45 as a base point. The feed arm 42 rotates counterclockwise as viewed from the left side with the connecting portion 45 as the center. As the feed arm 42 rotates, the connecting portion 46 moves downward. The connecting portion 46 pulls the tip of the intermediate working arm 38 downward. The intermediate working arm 38 rotates counterclockwise about the horizontal feed shaft 28 and the tip thereof is inclined obliquely downward. In conjunction with the rotation of the intermediate action arm 38, the horizontal feed shaft 28 rotates counterclockwise. The link member 50 rotates counterclockwise in conjunction with the horizontal feed shaft 28. The feed base 33 moves backward. When the drive shaft 36 is rotated to one end of the rotatable range, the feed dog 34 is positioned at the rear end of the feed dog hole 19. The cloth feed mechanism 30 is in the second state.

  The cloth feed motor 35 reverses the rotation direction of the drive shaft 36. The drive shaft 36 rotates counterclockwise. The feed arm 41 rotates counterclockwise as the drive shaft 36 rotates. The connecting portion 45 moves from the front position to the intermediate position. The feed arm 41 and the feed arm 42 are in a straight line in the vertical direction. The intermediate working arm 38 rotates clockwise about the horizontal feed shaft 28 and returns to substantially horizontal. In conjunction with the rotation of the intermediate working arm 38, the horizontal feed shaft 28 rotates clockwise. The link member 50 rotates clockwise in conjunction with the horizontal feed shaft 28. The feed base 33 moves forward. The feed dog 34 is located in the forefront of the feed dog hole 19. The cloth feed mechanism 30 returns to the first state (see FIG. 4).

[Third state]
The drive shaft 36 continues to rotate counterclockwise from the first state. The feed arm 41 continues to rotate counterclockwise as the drive shaft 36 rotates. As shown in FIG. 6, the connecting portion 45 moves from the intermediate position to the rear position. The feed arm 41 and the feed arm 42 are bent in a substantially L shape toward the rear, which is the opposite side to the second state, with the connecting portion 45 as a base point. The feed arm 42 rotates clockwise around the connecting portion 45. As the feed arm 42 rotates, the connecting portion 46 moves downward. The connecting portion 46 pulls the tip of the intermediate working arm 38 downward. The intermediate working arm 38 rotates counterclockwise about the horizontal feed shaft 28 and the tip thereof is inclined obliquely downward. In conjunction with the rotation of the intermediate action arm 38, the horizontal feed shaft 28 rotates counterclockwise. The link member 50 rotates counterclockwise in conjunction with the horizontal feed shaft 28. The feed base 33 moves backward. When the drive shaft 36 is rotated to the other end of the rotatable range, the feed dog 34 is positioned at the rear end of the feed dog hole 19. The cloth feed mechanism 30 is in the third state.

  The cloth feed motor 35 reverses the rotation direction of the drive shaft 36. The drive shaft 36 rotates clockwise. The feed arm 41 rotates clockwise as the drive shaft 36 rotates. The connecting part 45 moves from the rear position to the intermediate position. The feed arm 41 and the feed arm 42 are in a straight line in the vertical direction. The intermediate working arm 38 rotates clockwise about the horizontal feed shaft 28 and returns to substantially horizontal. In conjunction with the rotation of the intermediate working arm 38, the horizontal feed shaft 28 rotates clockwise. The link member 51 rotates clockwise in conjunction with the horizontal feed shaft 28. The feed base 33 moves forward. The feed dog 34 is located in the forefront of the feed dog hole 19. The cloth feed mechanism 30 returns to the first state.

  The cloth feed mechanism 30 moves the feed base 33 in the front-rear direction by repeating the first to third states described above by driving the cloth feed motor 35. The power transmission mechanism 40 converts the rotation of the drive shaft 36 in one direction and in the opposite direction into a swinging motion in which the tip of the intermediate working arm 38 is swung back and forth once around the horizontal feed shaft 28. it can. When the intermediate working arm 38 swings one reciprocating motion in the vertical direction, the horizontal feed shaft 28 rotates one reciprocating motion, and the feed base 33 moves one reciprocating motion in the front-rear direction. That is, when the drive shaft 36 rotates in one direction or the reverse direction, the feed base 33 can reciprocate once in the front-rear direction. The power transmission mechanism 40 can reduce the switching frequency of the rotation direction of the cloth feed motor 35. Therefore, the sewing machine 1 can reduce the load applied to the cloth feed motor 35.

  An operation in which the cloth feeding mechanism 30 feeds the cloth backward will be described. The cloth feeding mechanism 30 feeds the cloth by the repetition of the first to third states by driving the cloth feeding motor 35 and the vertical movement of the feeding base 33 by driving the main motor 13 described above. When the cloth feed mechanism 30 is in the first state, the feed base 33 is in a position where the feed dog 34 substantially coincides with the upper surface of the needle plate 15 by the eccentric portion 39 and the link member 51.

  When the main motor 13 is driven, the feed base 33 is pushed upward by the eccentric portion 39 and the link member 51, and the feed dog 34 protrudes upward from the upper surface of the needle plate 15. The cloth feed motor 35 rotates the drive shaft 36 clockwise. The feed base 33 is moved backward by the power transmission mechanism 40. Therefore, the cloth feed mechanism 30 feeds the cloth backward.

  When the main motor 13 continues to drive, the feed base 33 returns to the position where the feed dog 34 substantially coincides with the upper surface of the needle plate 15 by the eccentric portion 39 and the link member 51. In the cloth feed mechanism 30, the drive shaft 36 of the cloth feed motor 35 is rotated clockwise to one end of the rotation range to be in the second state. The cloth feed mechanism 30 stops feeding the cloth.

  After the second state, the feed base 33 is lowered downward by the eccentric portion 39 and the link member 51, and the feed dog 34 is lowered downward from the upper surface of the needle plate 15. The cloth feed motor 35 rotates counterclockwise by reversing the rotation direction of the drive shaft 36. The feed base 33 is moved forward by the power transmission mechanism 40. Since the feed dog 34 is lowered from the upper surface of the needle plate 15, the cloth feed mechanism 30 does not feed the cloth.

  When the main motor 13 continues to drive, the feed base 33 returns to the position where the feed dog 34 substantially coincides with the upper surface of the needle plate 15 by the eccentric portion 39 and the link member 51. The cloth feed mechanism 30 returns to the first state by the counterclockwise rotation of the drive shaft 36 of the cloth feed motor 35.

  After the first state, the feed base 33 is pushed up again by the eccentric portion 39 and the link member 51, and the feed dog 34 protrudes upward from the upper surface of the needle plate 15. The cloth feed motor 35 continues to rotate the drive shaft 36 counterclockwise. The moving direction of the feed base 33 is switched from the front to the rear. The cloth feed mechanism 30 feeds the cloth backward again.

  When the main motor 13 continues to drive, the feed base 33 returns to the position where the feed dog 34 substantially coincides with the upper surface of the needle plate 15 by the eccentric portion 39 and the link member 51. In the cloth feed mechanism 30, the drive shaft 36 of the cloth feed motor 35 rotates counterclockwise to the other end of the rotation range to be in the third state. The cloth feed mechanism 30 stops feeding the cloth.

  After the third state, the feed base 33 is lowered downward by the eccentric portion 39 and the link member 51, and the feed dog 34 is lowered downward from the upper surface of the needle plate 15. The cloth feed motor 35 rotates clockwise by reversing the rotation direction of the drive shaft 36. The feed base 33 is moved forward by the power transmission mechanism 40. Since the feed dog 34 is lowered from the upper surface of the needle plate 15, the cloth feed mechanism 30 does not feed the cloth.

  When the main motor 13 continues to drive, the feed base 33 returns to the position where the feed dog 34 substantially coincides with the upper surface of the needle plate 15 by the eccentric portion 39 and the link member 51. By the clockwise rotation of the drive shaft 36 of the cloth feed motor 35, the cloth feed mechanism 30 returns to the first state and repeats the above-described operation.

  The cloth feed load on the feed base 33 is the largest when the feed dog 34 starts to protrude upward from a position substantially coincident with the upper surface of the needle plate 15 when the cloth starts to be fed. The cloth feed load affects the drive shaft 36 of the cloth feed motor 35. In the first state, the feed arm 41 and the feed arm 42 are positioned on a straight line in the vertical direction. In the first state, the cloth feed motor 35 does not reverse the rotation direction of the drive shaft 36. Therefore, since the first state transmits the driving force of the cloth feed motor 35 to the horizontal feed shaft 28, the load applied to the cloth feed motor 35 is small and the optimum state. When the feed dog 34 is at a position substantially coincident with the upper surface of the needle plate 15, the cloth feed mechanism 30 is in the first state. Therefore, the sewing machine 1 can reduce the load applied to the cloth feed motor 35 at the start of the cloth feed.

  In the above description, the cloth feed motor 35 shown in FIG. 3 is an example of the “first motor” in the present invention. The drive shaft 36 is an example of the “first drive shaft” in the present invention. The link mechanism 37 is an example of the “first link mechanism” in the present invention. The link member 50 is an example of the “first link member” in the present invention. The intermediate working arm 38 is an example of the “horizontal working arm” in the present invention. The power transmission mechanism 40 is an example of the “first power transmission mechanism” in the present invention. The feed arm 41 is an example of the “first horizontal feed arm” in the present invention. The feed arm 42 is an example of the “second horizontal feed arm” in the present invention. The connecting portion 45 is an example of the “first connecting portion” in the present invention.

  As described above, the sewing machine 1 according to the first embodiment includes the cloth feeding mechanism 30. The cloth feed mechanism 30 includes a feed base 33, a cloth feed motor 35, a link mechanism 37, and a horizontal feed shaft 28. The link mechanism 37 includes an intermediate action arm 38 and a power transmission mechanism 40. The drive shaft 36 of the cloth feed motor 35 reciprocates at an angle within a predetermined range. The intermediate working arm 38 is attached to the right end side of the horizontal feed shaft 28. The power transmission mechanism 40 includes a feed arm 41, a feed arm 42, and a connecting portion 45. One end of the feed arm 41 is attached perpendicular to the tip of the drive shaft 36 of the cloth feed motor 35. The other end of the feed arm 41 is rotatably connected to one end of the feed arm 42 at a connecting portion 45. The other end of the feed arm 42 is rotatably connected to the front end of the intermediate action arm 38 in the extending direction. The position of the connecting portion 45 when the feed arm 41 and the feed arm 42 are positioned in a straight line in the vertical direction is an intermediate position. When the drive shaft 36 of the cloth feed motor 35 reciprocates at an angle within a predetermined range, the connecting portion 45 reciprocates in the front-rear direction of the intermediate position. Therefore, the power transmission mechanism 40 performs a swinging motion in which the rotation of the drive shaft 36 in one direction and in the opposite direction is performed by reciprocally swinging the tip of the intermediate working arm 38 up and down around the horizontal feed shaft 28. Can be converted. When the intermediate working arm 38 swings one reciprocating motion in the vertical direction, the horizontal feed shaft 28 rotates one reciprocating motion, and the feed base 33 moves one reciprocating motion in the front-rear direction. That is, when the drive shaft 36 rotates in one direction or the reverse direction, the feed base 33 reciprocates once in the front-rear direction. The power transmission mechanism 40 can reduce the switching frequency of the rotation direction of the cloth feed motor 35. The sewing machine 1 can reduce the load applied to the cloth feed motor 35 by reducing the switching frequency of the rotation direction of the cloth feed motor 35.

  Next, a sewing machine according to a second embodiment of the present invention will be described with reference to FIGS. The upper side, the lower side, the left rear side, the right front side, the right rear side, and the left front side in FIG. 7 are the upper side, the lower side, the right side, the left side, the front side, and the rear side of the sewing machine, respectively. As shown in FIG. 7, the sewing machine according to the second embodiment includes a cloth feed mechanism 70. The cloth feed mechanism 70 includes a power transmission mechanism 60. The power transmission mechanism 60 is a modified form of the power transmission mechanism 40 (see FIG. 4) of the first embodiment. Structures other than the power transmission mechanism 60 are the same as those in the first embodiment. Therefore, the structure and operation of the power transmission mechanism 60 will be mainly described.

  The structure of the power transmission mechanism 60 will be described. As shown in FIG. 7, the power transmission mechanism 60 includes a groove cam 65. The groove cam 65 is attached to the drive shaft 36 of the cloth feed motor 35. The groove cam 65 includes a cam plate 61, a bottom plate 66, and a side plate 67. The cam plate 61 has a disk shape. The cam plate 61 has a curved surface corresponding to the rotation angle of the drive shaft 36. The cam plate 61 has a convex portion 62 on a curved surface. The convex part 62 contacts the contact part 56 mentioned later. The bottom plate 66 is fixed to the bottom surface of the cam plate 61. The bottom plate 66 has the same shape as the bottom surface of the cam plate 61 and is larger than the bottom surface of the cam plate 61. The bottom plate 66 is provided with a side plate 67 at the peripheral end. The contact portion 56 is inserted into a groove formed between the cam plate 61 and the side plate 67.

  The contact portion 56 is provided at the rear end of the intermediate working arm 55. The contact portion 56 is orthogonal to the longitudinal direction of the intermediate working arm 55 and protrudes to the right. The intermediate working arm 55 is attached to the right end side of the horizontal feed shaft 28. The intermediate action arm 55 is orthogonal to the longitudinal direction of the horizontal feed shaft 28 and extends rearward.

  When the drive shaft 36 of the cloth feed motor 35 reciprocates at an angle within a predetermined range, the cam plate 61 reciprocates. The contact portion 56 of the intermediate action arm 55 moves in the vertical direction along the convex portion 62 as the cam plate 61 reciprocates. As the contact portion 56 moves, the intermediate working arm 55 rotates around the horizontal feed shaft 28. The horizontal feed shaft 28 rotates in conjunction with the rotation of the intermediate working arm 55. The feed table 33 moves in the front-rear direction by the rotation of the horizontal feed shaft 28.

  Next, the operation of the cloth feed mechanism 70 will be described with reference to FIGS. The cloth feed mechanism 70 feeds the cloth on the bed unit 2 by repeating the first to third states as in the first embodiment. The second embodiment is different from the first embodiment only in the power transmission mechanism 60. Therefore, the operation of the power transmission mechanism 60 will be mainly described.

[First state]
As shown in FIG. 7, in the power transmission mechanism 60, the convex portion 62 of the cam plate 61 contacts the contact portion 56 of the intermediate action arm 55. The contact part 56 is located in the uppermost part. The feed base 33 is located in the forefront. In the present embodiment, the position of the convex portion 62 when the convex portion 62 of the cam plate 61 contacts the contact portion 56 of the intermediate working arm 55 is the intermediate position.
[Second state]
As shown in FIG. 8, when the cloth feed motor 35 is driven from the first state, the drive shaft 36 rotates clockwise as viewed from the left side. The convex portion 62 of the cam plate 61 rotates clockwise as the drive shaft 36 rotates. The convex part 62 moves from the intermediate position to the front position. The contact portion 56 of the intermediate working arm 55 moves downward along the curved surface of the cam plate 61. The intermediate working arm 38 rotates about the horizontal feed shaft 28 counterclockwise when viewed from the left side. The horizontal feed shaft 28 rotates counterclockwise in conjunction with the rotation of the intermediate action arm 38. The link member 50 rotates counterclockwise in conjunction with the horizontal feed shaft 28. The feed base 33 moves backward. When the drive shaft 36 rotates to one end of the rotatable range, the cloth feed mechanism 70 enters the second state.

  The cloth feed motor 35 reverses the rotation direction of the drive shaft 36. The drive shaft 36 rotates counterclockwise. The cam plate 61 rotates counterclockwise as the drive shaft 36 rotates. The convex part 62 moves from the front position to the intermediate position. The convex part 62 pushes up the contact part 56 of the intermediate action arm 55. The intermediate working arm 38 rotates clockwise about the horizontal feed shaft 28. The horizontal feed shaft 28 rotates clockwise in conjunction with the rotation of the intermediate action arm 38. The link member 50 rotates clockwise in conjunction with the horizontal feed shaft 28. The feed base 33 moves forward. The cloth feed mechanism 70 returns to the first state (see FIG. 7).

[Third state]
The drive shaft 36 continues to rotate counterclockwise from the first state. The cam plate 61 continues to rotate counterclockwise as the drive shaft 36 rotates. As shown in FIG. 9, the convex part 62 moves from the intermediate position to the rear position. The contact portion 56 of the intermediate working arm 55 moves downward along the curved surface of the cam plate 61. The intermediate working arm 38 rotates counterclockwise about the horizontal feed shaft 28. The horizontal feed shaft 28 rotates counterclockwise in conjunction with the rotation of the intermediate action arm 38. The link member 50 rotates counterclockwise in conjunction with the horizontal feed shaft 28. The feed base 33 moves backward. When the drive shaft 36 is rotated to the other end of the rotatable range, the cloth feeding mechanism 70 is in the third state.

  The cloth feed motor 35 reverses the rotation direction of the drive shaft 36. The drive shaft 36 rotates clockwise. The cam plate 61 rotates clockwise as the drive shaft 36 rotates. As shown in FIG. 7, the convex part 62 moves from the rear position to the intermediate position. The intermediate working arm 38 rotates clockwise about the horizontal feed shaft 28. The horizontal feed shaft 28 rotates clockwise in conjunction with the rotation of the intermediate action arm 38. The link member 50 rotates clockwise in conjunction with the horizontal feed shaft 28. The feed base 33 moves to the forefront. The cloth feed mechanism 70 returns to the first state.

  In the above description, the power transmission mechanism 60 shown in FIG. 7 is an example of the “first power transmission mechanism” in the present invention. The groove cam 65 is an example of the “first cam” in the present invention. The convex portion 62 is an example of the “first convex portion” in the present invention.

  As described above, the sewing machine according to the second embodiment includes the cloth feeding mechanism 70. The cloth feed mechanism 70 includes a power transmission mechanism 60. The power transmission mechanism 60 transmits the power of the cloth feed motor 35 to the horizontal feed shaft 28 using a cam mechanism. The power transmission mechanism 60 includes a groove cam 65. The groove cam 65 is attached to the tip of the drive shaft 36 of the cloth feed motor 35. The cam plate 61 of the groove cam 65 has a convex portion 62 on the curved surface. The convex part 62 contacts the contact part 56 provided at the tip of the intermediate action arm 55 by the rotation of the cam plate 61. The position of the convex portion 62 when the convex portion 62 contacts the contact portion 56 of the intermediate working arm 55 is an intermediate position. The drive shaft 36 of the cloth feed motor 35 reciprocates at an angle within a predetermined range. The convex portion 62 of the cam plate 61 reciprocates around the intermediate position.

  As in the first embodiment, the power transmission mechanism 60 rotates the drive shaft 36 in one direction and in the opposite direction, and makes the tip of the intermediate working arm 55 reciprocate up and down about the horizontal feed shaft 28. It can be converted into a swing motion that swings. When the tip of the intermediate working arm 55 swings one reciprocating motion in the vertical direction, the horizontal feed shaft 28 rotates one reciprocating motion, and the feed base 33 moves one reciprocating motion in the front-rear direction. When the drive shaft 36 rotates in one direction or in the opposite direction, the feed base 33 can reciprocate once in the front-rear direction. The power transmission mechanism 60 can reduce the switching frequency of the rotation direction of the cloth feed motor 35. The sewing machine of the second embodiment can reduce the load applied to the cloth feed motor 35 by reducing the switching frequency of the rotation direction of the cloth feed motor 35.

  Next, a sewing machine according to a third embodiment of the present invention will be described with reference to FIGS. The upper side, the lower side, the left rear side, the right front side, the right rear side, and the left front side in FIG. 10 are the upper side, lower side, right side, left side, front side, and rear side of the sewing machine, respectively. As shown in FIG. 10, the sewing machine according to the third embodiment includes a cloth feed mechanism 90. The cloth feed mechanism 90 moves the feed base 33 up and down using the power transmission mechanism 80. The power transmission mechanism 80 has the same structure as the power transmission mechanism 40 of the first embodiment. The cloth feed mechanism 90 includes the power transmission mechanism 40 of the first embodiment as a mechanism for moving the feed base 33 horizontally. The structure other than the power transmission mechanism 80 is the same as that of the first embodiment. Therefore, the structure and operation of the power transmission mechanism 80 will be mainly described.

  As shown in FIG. 10, the cloth feed mechanism 90 includes a vertical feed motor 75 in addition to the feed base 33, the feed dog 34, the cloth feed motor 35, the link mechanism 37, the horizontal feed shaft 28, and the link member 50 of the first embodiment. A link mechanism 77, a vertical feed shaft 91, a link member 93, and a link member 94.

  The vertical feed motor 75 is disposed between the feed base 33 and the cloth feed motor 35. The vertical feed motor 75 is a stepping motor. The vertical feed motor 75 moves the feed base 33 in the vertical direction. The drive shaft 76 of the vertical feed motor 75 extends to the left. The drive shaft 76 rotates within a predetermined angle range.

  The link mechanism 77 includes a power transmission mechanism 80 and an intermediate action arm 78. The power transmission mechanism 80 includes a feed arm 81, a feed arm 82, and a connecting portion 85. One end of the feed arm 81 is attached perpendicular to the tip of the drive shaft 76 of the vertical feed motor 75. The other end of the feed arm 81 is rotatably connected to one end of the feed arm 82. The other end of the feed arm 82 is rotatably connected to the end of the intermediate action arm 78 in the extending direction. A portion where the other end of the feed arm 81 and one end of the feed arm 82 are connected is a connecting portion 85. A portion where the other end of the feed arm 82 and the tip of the intermediate working arm 78 are connected is a connecting portion 86. When the drive shaft 76 reciprocates, the connecting portion 85 reciprocates in the vertical direction, and the connecting portion 86 reciprocates in the front-rear direction. The intermediate working arm 78 is attached to the right end side of the vertical feed shaft 91 at the end opposite to the portion connected to the connecting portion 86. The intermediate working arm 78 is orthogonal to the longitudinal direction of the vertical feed shaft 91 and extends downward. The vertical feed shaft 91 is rotatably provided at the upper left of the vertical feed motor 75. The vertical feed shaft 91 extends in the left-right direction.

  The rear end of the link member 94 is attached perpendicular to the left end portion of the vertical feed shaft 91. The front end of the link member 94 is rotatably connected to the lower end portion of the link member 93. The upper end of the link member 93 is rotatably connected to the rear end portion of the feed base 33.

  With reference to FIG. 11 and FIG. 12, the operation | movement of the up-down direction of the cloth feeding mechanism 90 is demonstrated. The cloth feed mechanism 90 moves the feed base 33 up and down by repeating Step A to Step F. Since the third embodiment is different from the first embodiment only in the power transmission mechanism 80, the operation of the power transmission mechanism 80 will be mainly described.

  As shown in FIG. 11, in step A, the power transmission mechanism 80 has the feeding arm 81 and the feeding arm 82 positioned on a straight line. The connecting portion 86 is located behind the connecting portion 85. The intermediate working arm 78 is substantially vertical. The feed base 33 is located at the lowest position. In the third embodiment, the position of the connecting portion 85 when the feed arm 81 and the feed arm 82 are in a straight line is the intermediate position.

  The vertical feed motor 75 is driven. In step B, the drive shaft 76 rotates clockwise as viewed from the left side. The feed arm 81 rotates clockwise as the drive shaft 76 rotates. The connecting portion 85 moves upward from the intermediate position. The feed arm 81 and the feed arm 82 are bent in an approximately L shape upward from the connecting portion 85 as a base point. The feed arm 82 rotates counterclockwise as viewed from the left side about the connecting portion 85. The connecting portion 86 moves forward by the rotation of the feed arm 82. The connecting portion 86 pulls the tip of the intermediate working arm 78 forward. The intermediate working arm 78 rotates counterclockwise about the vertical feed shaft 91. In conjunction with the rotation of the intermediate working arm 78, the vertical feed shaft 91 rotates counterclockwise. The link member 94 rotates counterclockwise in conjunction with the vertical feed shaft 91. The link member 93 pushes up the feed base 33. In the feed base 33, the feed dog 34 substantially coincides with the upper surface of the needle plate 15. In step C, the drive shaft 76 rotates to one end of the rotatable range. The feed base 33 moves to the upper position. The feed dog 34 rises from the upper surface of the needle plate 15 through the feed dog hole 19.

  As shown in FIG. 12, in step D, the vertical feed motor 75 reverses the rotation direction of the drive shaft 76. The drive shaft 76 rotates counterclockwise. The feed arm 81 rotates counterclockwise as the drive shaft 76 rotates. The connecting portion 85 moves downward from the upper position. The intermediate working arm 78 rotates around the vertical feed shaft 91. In conjunction with the rotation of the intermediate action arm 78, the vertical feed shaft 91 rotates clockwise. The link member 94 rotates clockwise in conjunction with the vertical feed shaft 91. The link member 93 pulls the feed base 33 downward. In the feed base 33, the feed dog 34 substantially coincides with the upper surface of the needle plate 15. In step E, the feed arm 81 and the feed arm 82 are positioned on a straight line. The intermediate working arm 78 returns substantially vertically. The feed base 33 moves to the lowest position. The feed dog 34 is lowered from the upper surface of the needle plate 15.

  The drive shaft 76 continues to rotate counterclockwise via step E. The feed arm 81 continues to rotate counterclockwise as the drive shaft 76 rotates. In step F, the connecting portion 85 moves from the intermediate position to the lower position. The feed arm 81 and the feed arm 82 are bent in a substantially L shape downward from the connecting portion 85 on the opposite side to the step C. The feed arm 82 rotates clockwise around the connecting portion 85. The connecting portion 86 moves forward by the rotation of the feed arm 82. The connecting portion 86 pulls the tip of the intermediate working arm 78 forward. The intermediate working arm 78 rotates counterclockwise about the vertical feed shaft 91. The vertical feed shaft 91 rotates counterclockwise in conjunction with the rotation of the intermediate action arm 78. The link member 94 rotates counterclockwise in conjunction with the vertical feed shaft 91. The link member 93 pushes up the feed base 33. The feed base 33 moves to the upper position. The feed dog 34 rises from the upper surface of the needle plate 15 through the feed dog hole 19. The cloth feed mechanism 90 is in the third state. The link member 94 rotates clockwise in conjunction with the vertical feed shaft 91. The link member 93 pulls the feed base 33 downward. The feed base 33 moves to the lowest position. The feed dog 34 is lowered from the upper surface of the needle plate 15. The cloth feed mechanism 90 returns to Step A.

  The cloth feed mechanism 90 repeats Step A to Step F described above. The power transmission mechanism 80 converts the rotation of the drive shaft 76 in one direction and the opposite direction into a swinging motion in which the tip of the intermediate working arm 78 is reciprocally swung back and forth around the vertical feed shaft 91. it can. When the intermediate action arm 78 swings one reciprocating motion in the front-rear direction, the vertical feed shaft 91 rotates one reciprocating motion, and the feed base 33 moves one reciprocating motion in the vertical direction. That is, when the drive shaft 76 rotates in one direction or the opposite direction, the feed base 33 reciprocates once in the vertical direction. The power transmission mechanism 80 can reduce the switching frequency of the rotation direction of the vertical feed motor 75. Therefore, the sewing machine can reduce the load applied to the vertical feed motor 75 by reducing the switching frequency of the rotation direction of the vertical feed motor 75.

  In the above description, the vertical feed motor 75 shown in FIG. 10 is an example of the “second motor” in the present invention. The drive shaft 76 is an example of the “second drive shaft” in the present invention. The link mechanism 77 is an example of the “second link mechanism” in the present invention. The link members 93 and 94 are examples of the “second link member” in the present invention. The intermediate working arm 78 is an example of the “upper and lower working arms” of the present invention. The power transmission mechanism 80 is an example of the “second power transmission mechanism” in the present invention. The feed arm 81 is an example of the “first vertical feed arm” in the present invention. The feed arm 82 is an example of the “second vertical feed arm” in the present invention. The connecting portion 85 is an example of the “second connecting portion” in the present invention.

  As described above, the sewing machine according to the third embodiment includes the cloth feeding mechanism 90. The cloth feed mechanism 90 includes a power transmission mechanism 80. The power transmission mechanism 80 is a mechanism that moves the feed base 33 up and down. The power transmission mechanism 80 has the same structure as the power transmission mechanism 40 of the first embodiment. The power transmission mechanism 80 can reduce the switching frequency of the rotation direction of the vertical feed motor 75. The sewing machine according to the third embodiment can reduce the load on the vertical feed motor 75 by reducing the switching frequency of the rotation direction of the vertical feed motor 75.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. In the first embodiment, when the feed base 33 moves from the foremost position in the movement range, the cloth feed mechanism 30 starts from the first state in which the feed arm 41 and the feed arm 42 are positioned on a straight line. . For example, the cloth feed mechanism 30 may start from the first state when the feed base 33 moves from the last position in the movement range. The same applies to the cloth feed mechanism 70 of the second embodiment.

  In the third embodiment, the cloth feed mechanism 90 includes a power transmission mechanism 40 for moving the feed base 33 horizontally and a power transmission mechanism 80 for moving the feed base 33 up and down. For example, a well-known feed mechanism may be adopted as a mechanism that includes only the power transmission mechanism 80 and moves the feed base 33 horizontally.

  In the third embodiment, the power transmission mechanism 80 is a link mechanism that transmits the driving force of the vertical feed motor 75 to the vertical feed shaft 91. However, like the power transmission mechanism 60 of the second embodiment, it is transmitted by a cam mechanism. You may do it.

DESCRIPTION OF SYMBOLS 1 Sewing machine 27 Lower shaft 28 Horizontal feed shaft 30 Cloth feed mechanism 33 Feed stand 34 Feed dog 35 Cloth feed motor 36 Drive shaft 38 Intermediate action arm 40 Power transmission mechanism 41 Feed arm 42 Feed arm 45 Connection part 50 Link member 55 Intermediate action arm DESCRIPTION OF SYMBOLS 60 Power transmission mechanism 61 Cam board 62 Convex part 65 Groove cam 70 Cloth feed mechanism 75 Vertical feed motor 76 Drive shaft 78 Intermediate action arm 80 Power transmission mechanism 81 Feed arm 82 Feed arm 85 Connection part 90 Cloth feed mechanism 91 Vertical feed shaft 93 Link member 94 Link member

Claims (12)

A first motor for rotating the first drive shaft within a predetermined angle range;
A feed base for horizontally supporting the feed dog;
One end is connected to the first drive shaft via a first link mechanism, the other end is connected to the feed base via a first link member, and interlocked with the rotation of the first drive shaft by the first motor. In a sewing machine provided with a horizontal feed shaft that imparts a feed operation in the horizontal direction to the feed base by rotating
The first link mechanism includes:
A horizontal working arm provided orthogonal to the one end side of the horizontal feed shaft;
The rotation of the first drive shaft in one direction and in the opposite direction is converted into a swinging motion in which one end of the horizontal working arm is reciprocally swung around the horizontal feed shaft to be converted into the horizontal feed shaft. A sewing machine comprising: a first power transmission mechanism for transmitting power. The first power transmission mechanism includes:
A first horizontal feed arm connected orthogonally to the first drive shaft;
A second horizontal feed arm pivotably connected to the one end of the horizontal action arm; and a first connection portion pivotably connecting the first horizontal feed arm and the second horizontal feed arm. The sewing machine according to claim 1.   When the first drive shaft is rotated, the first horizontal feed arm and the second horizontal feed arm are rotated so that the position of the first connecting portion that is substantially on the same straight line is within the predetermined angle range. The sewing machine according to claim 2, wherein when the intermediate position is set, the first connecting portion swings on both sides with the intermediate position as a center.   The sewing machine according to claim 3, wherein when the feed base is located at one end of a feed operation range in the horizontal direction, the first connecting portion is located at the intermediate position. The first power transmission mechanism includes:
The first drive shaft is provided with at least one first convex portion on a curved surface corresponding to the rotation angle of the first drive shaft, and the first convex portion acts on the one end of the horizontal action arm. The sewing machine according to claim 1, further comprising a cam.   When the position where the first cam is rotated by the rotation of the first drive shaft and the first convex portion is in contact with the one end of the horizontal working arm is set as an intermediate position in the predetermined angle range, The sewing machine according to claim 5, wherein the first convex portion swings to both sides with the intermediate position as a center.   The sewing machine according to claim 6, wherein when the feed base is positioned at one end of a horizontal feed operation range, the first convex portion is positioned at the intermediate position. A second motor for rotating the second drive shaft within a predetermined angle range;
One end is connected to the second drive shaft via a second link mechanism, the other end is connected to the feed base via a second link member, and interlocked with the rotation of the second drive shaft by the second motor. And a vertical feed shaft that imparts a vertical feed operation to the feed base by rotating,
The second link mechanism is
A vertical working arm provided orthogonal to the one end side of the vertical feed shaft;
The rotation of the second drive shaft in one direction and in the opposite direction is converted into a swinging motion in which one end of the vertical working arm is reciprocally swung around the vertical feed shaft to be converted into the vertical feed shaft. The sewing machine according to claim 1, further comprising a second power transmission mechanism that transmits power. The second power transmission mechanism is
A first vertical feed arm connected orthogonally to the second drive shaft;
A second vertical feed arm pivotably connected to the one end of the vertical working arm;
The sewing machine according to claim 8, further comprising a second connecting portion that rotatably connects the first vertical feed arm and the second vertical feed arm.   When the second drive shaft is rotated, the first vertical feed arm and the second vertical feed arm are rotated so that the position of the second connecting portion that is substantially on the same straight line is within the predetermined angle range. The sewing machine according to claim 9, wherein when the intermediate position is set, the second connecting portion swings on both sides with the intermediate position as a center.   The sewing machine according to claim 10, wherein when the feed base is located at a lower end of a feed operation range in the vertical direction, the second connecting portion is located at the intermediate position. A second motor for rotating the second drive shaft at a predetermined angle;
A feed base for horizontally supporting the feed dog;
One end is connected to the second drive shaft via a second link mechanism, the other end is connected to the feed base via a second link member, and interlocked with the rotation of the second drive shaft by the second motor. In a sewing machine provided with a vertical feed shaft that imparts a vertical feed operation to the feed base by rotating
The second link mechanism is
A vertical working arm provided orthogonal to the one end side of the vertical feed shaft;
A second power transmission mechanism that converts the reciprocating rotation of the second drive shaft at a predetermined angle into a swinging motion that reciprocally swings one end of the vertical working arm to transmit power to the vertical feed shaft; A sewing machine characterized by comprising.

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