JP4270008B2 - Sewing machine with buttons - Google Patents

Description

  The present invention relates to a button sewing machine for sewing buttons to a fabric.

  Conventionally, the button-attached sewing machine that has been put into practical use by the applicant of the present application includes a presser arm whose base end side portion is pivotally supported by the bed portion of the sewing machine body, and a horizontal direction on the front end side portion of the presser arm. A pair of button gripping members that can be freely opened and closed and can grip a button in a closed state, a gripping member opening and closing mechanism that opens and closes the pair of button gripping members, and a button gripped by the pair of button gripping members are sewn. A pair of presser portions for pressing the vicinity of the button on the needle plate of the bed portion of the fabric is provided (for example, see Patent Document 1).

In this button-attached sewing machine, a pair of presser portions are integrally provided on the lower surface portion of the pair of button gripping members, and a pair of press grippers is provided in accordance with the size of the button gripped by the pair of button gripping members. When the distance between the button gripping members changes, the distance between the pair of presser portions also changes.
By the way, if the button sewed on the fabric is too close to the fabric, it is difficult to pass the button through the button hole, and there is a possibility that the button may be broken if the button is forced to pass. Therefore, in the button-attached sewing machine disclosed in Patent Document 1, an elongated groove communicating with the needle hole is formed in the needle plate, and an elongated slack forming member that crosses the needle hole is disposed in the groove.

  In this button sewing machine, in order to sew the button to the fabric, when the fabric is pressed onto the needle plate by the presser part (the lower surface of the button gripping member), the button is held in a state of floating on the fabric by the button gripping member, The slack forming member comes into contact with the lower surface of the fabric under the button. In this state, when the sewing of the button by the sewing machine is performed, the transition yarn on the lower side of the cloth crossing the button hole enters the state of crossing the lower side of the slack forming member. That is, after the button is sewn, the connecting thread is pulled out of the slack forming member, so that the seam for sewing the button to the fabric is made slack.

Japanese Utility Model Publication No. 61-7659

  In a button sewing machine in which a pair of presser portions are integrally provided on the bottom surface of a pair of button gripping members, the height position of the button gripping member relative to the presser portion cannot be adjusted. The desired slack cannot be given. In particular, since the buttons gripped by the pair of button gripping members are in a state of being very close to the fabric, a problem that the button sewn on the fabric is too close to the fabric is likely to occur. Therefore, it is conceivable to provide a plurality of types of button gripping members in which the vertical thickness of the gripping portion of the button gripping member, that is, the vertical distance between the button gripped by the button gripping member and the presser portion is changed, but the number of parts is large. There is a problem that there is a limit in freely adjusting the slack of the seam that stitches the button to the fabric.

In the button-attached sewing machine of Patent Document 1, a slack is formed on the seam that sews the button to the fabric by the slack-forming member, but in order to have the desired slack on the seam that sews the button to the fabric. In addition to the same problems as described above, after the button is sewn to the fabric, the operation of pulling the connecting thread from the slack forming member is complicated, and in that case, the connecting thread may be damaged or further broken. There are problems such as.
An object of the present invention is to provide a button-attached sewing machine that can surely have an appropriate slack in a seam for sewing a button to a fabric.

The sewing machine with a button according to claim 1 is a closed state in which a presser arm whose base end side portion is pivotally supported so as to be movable up and down on the bed portion of the main body of the sewing machine and which can be opened and closed horizontally is attached to the tip end side portion of the presser arm In a button sewing machine having a pair of button gripping members capable of gripping a button and a gripping member opening / closing mechanism for opening and closing the pair of button gripping members, the buttons gripped by the pair of button gripping members are sewn. pressing Ru the presser portion and the pressing member of the pair having respectively the relative with respect to the pressing portion of the pair of the pressing member is a pressing arm portion near to the needle plate of the bed portion of the button out of the fabric to give to a connecting means for movable connection for the pair of the pressing member to move by a predetermined amount in the pressing arm in the vertical direction, and urged against the pair of pressing members, 1 by the biasing force pressing the pair of presser members There characterized by comprising biasing means for causing to suppress the fabric on the needle plate, and a pressing arm driving means having an actuator for driving the presser arm vertically.

  The pair of button gripping members are opened and closed by the gripping member opening / closing mechanism, the pair of button gripping members are switched to the closed state, and the buttons are gripped by the pair of button gripping members in the closed state. Note that the interval between the pair of button gripping members in the closed state changes according to the size of the button to be gripped. The presser arm is raised by the arm driving means, and the fabric is set on the needle plate in a state where the presser portions of the pair of presser members are spaced upward from the needle plate. The presser portions of the pair of presser members connected to the presser arms by the connecting means can move by a predetermined amount in the vertical direction relative to the presser arms, and the pair of presser members are moved by the biasing means. The portion is urged toward the fabric presser side that presses the fabric onto the needle plate.

  That is, in a state where the pair of presser portions are spaced upward from the needle plate, the presser portions of the pair of presser members are lowered to the maximum with respect to the presser arm, and after the fabric is set on the needle plate, In order to press the cloth onto the needle plate with a pair of presser portions, the presser arm is lowered by the arm driving means. When the presser arm is lowered, first, the pair of presser portions come into contact with the needle plate through the fabric, and the fabric is pressed onto the needle plate by the pair of presser portions by the biasing force of the biasing means. When this state is maintained and the presser arm is further lowered against the urging force of the urging means, a pair of button gripping members mounted on the tip side portion of the presser arm with respect to the pair of presser portions Is lowered. The presser arm, that is, the pair of button gripping members, can be lowered by a predetermined amount with respect to the pair of presser parts when the pair of presser parts come into contact with the needle plate via the cloth, The height of the button gripping member can be adjusted with respect to the presser part by stopping the movement of the button.

The button sewing machine is preferably configured as follows.
The actuator is a pulse motor (claim 2).
The presser portions of the pair of presser members are spaced downward from the pair of button gripping members in a state where the cloth is not pressed on the needle plate by the pair of presser members (Claim 3).
The connecting means has a pivotal support portion pivotally supported by the presser arm so that the base end portions of the pair of presser members can rotate about the horizontal axis.

The urging means is composed of a compression coil spring that urges a pair of pressing members to rotate toward the cloth pressing side.
The coupling means regulates an engaging portion provided on the presser arm and a presser member that is formed on the presser member and engages with the engaging portion so as not to rotate the presser member in the rotational biasing direction of the compression coil spring. And a rotation restricting portion that performs (claim 6).
The compression coil spring is interposed between a vertical spring receiving portion formed on the presser arm and a vertical spring receiving portion formed on the presser member.

The presser arm is pivotally supported by a feed base provided on the sewing machine body so as to be movable in the horizontal direction, and even if the presser arm moves in the horizontal direction integrally with the feed base, the height position of the presser arm is changed. In addition, arm drive connecting means for connecting the presser arm and the presser arm driving means is provided so that the driving force of the presser arm driving means can be transmitted to the presser arm.
The presser arm driving means includes arm urging means for urging the presser arm in a direction in which the tip end portion of the presser arm descends, and the urging force by the urging means is more than the urging force by the arm urging means. It is set to be smaller (claim 9).

According to button sewing machine according to claim 1, in particular, the the pair of the pressing member as the pressing portion of the pair of pressing members are moved by a predetermined amount to the relative to the vertical direction relative to the pressing arm coupling means, a pair of urges against the pressing member, biasing means for causing the biasing force thereof as the pressing portion of the pair of pressing members press the fabric on the needle plate of the movable coupling for the pressing arm, Since the presser arm driving means having an actuator for driving the presser arm up and down is provided, the presser arm is raised and the presser part of the pair of presser members is spaced upward from the needle plate, When the presser arm is lowered after the fabric is set on the needle plate, the pair of presser portions first come into contact with the needle plate via the fabric. 1 by the biasing force of the biasing means It can suppress the fabric on the needle plate by the pressing portion.

  While maintaining this state, the height position of the button gripping member relative to the presser portion can be adjusted by further lowering the presser arm, that is, the pair of button button gripping members, against the biasing force of the biasing means. That is, by a series of movements of lowering the presser arm, the pair of presser parts can hold the cloth on the needle plate, and the height position of the button gripping member with respect to the presser part can be adjusted. A desired slack can be given to the seam sewn on the fabric. In other words, it is possible to surely have an appropriate slack in the seam where the button is sewn to the fabric.

According to the buttoned sewing machine of the second aspect, since the actuator is a pulse motor, the height position of the button gripping member with respect to the presser can be easily and reliably adjusted.
According to the buttoned sewing machine of the third aspect, the presser portions of the pair of presser members are separated downward from the pair of button gripping members in a state where the cloth is not pressed on the needle plate by the pair of presser members. Therefore, the presser arm is lowered and the presser arm, that is, the pair of button gripping members, is lowered with respect to the pair of presser parts when the pair of presser parts comes into contact with the needle plate through the cloth. Therefore, the height position of the button gripping member with respect to the presser can be reliably adjusted.

According to the buttoned sewing machine of the fourth aspect, since the connecting means has the pivotal support portion pivotally supported by the presser arm so that the base end portions of the pair of presser members can rotate about the horizontal axis, The member can be pivotally supported by the presser arm, and the presser portions of the pair of presser members can be moved in the vertical direction relative to the presser arm.
According to the buttoned sewing machine of claim 5, since the urging means is composed of a compression coil spring that urges the pair of presser members to rotate toward the dough presser side, the pair of presser members is attached to the presser arm. It is possible to reliably urge the dough holding side.

According to the buttoned sewing machine of claim 6, the connecting means includes an engaging portion provided in the presser arm, and a presser member formed on the presser member and engaged with the engaging portion to rotate the presser coil spring. Since it has a rotation restricting portion that restricts it from rotating in the urging direction, the presser portion of the pair of presser members can be moved relative to the presser arm by a predetermined amount relative to the presser arm. The members can be connected.
According to the buttoned sewing machine of claim 7, the compression coil spring is interposed between the vertical spring receiving portion formed on the presser arm and the vertical spring receiving portion formed on the presser member. The biasing force of the coil spring can be reliably transmitted to the pair of pressing members.

  According to the buttoned sewing machine of the eighth aspect, even when the presser arm is pivotally supported by the feed base provided in the sewing machine body so as to be movable in the horizontal direction, and the presser arm moves in the horizontal direction integrally with the feed base. The arm drive connecting means that connects the presser arm and the presser arm driving means is provided so that the driving force by the presser arm driving means can be transmitted to the presser arm without changing the height position of the presser arm. Even when the presser arm is moved integrally with the base, the height position of the button gripping member can be kept constant.

  According to the buttoned sewing machine of claim 9, the presser arm driving means has the arm urging means for urging the presser arm in the direction in which the tip end portion of the presser arm is lowered, and the urging force by the urging means is Since it is set to be smaller than the urging force by the urging means, the urging force by the arm urging means causes the pair of pressers to contact the throat plate via the cloth, with respect to the pair of pressers. Thus, the presser arm, that is, the pair of button gripping members can be reliably lowered.

The sewing machine with a button according to the present embodiment is a closed state in which a presser arm whose base end side portion is pivotally supported so as to be movable up and down on the bed portion of the main body of the sewing machine, and a front end side portion of the presser arm that can be opened and closed horizontally. A pair of button gripping members capable of gripping the button, a gripping member opening / closing mechanism for opening and closing the pair of button gripping members, and the vicinity of the button of the fabric for sewing the buttons gripped by the pair of button gripping members moving presser Ru presser portion to the needle plate on the bed of the portion and the pressing member of the pair having respectively a predetermined amount to the relative to the vertical direction with respect to the pressing portion of the pair of the pressing member is the presser arm a coupling mechanism for movably connecting the pair of the pressing member against the presser arm to biases against the pair of pressing members, the pressing portion is a needle plate of the pair of pressing members by the biasing force urging that causes the press the dough on top And wood, in which a presser arm driving mechanism having a pulse motor for driving the presser arm up and down.

Hereinafter, Example 1 of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 to 10, the buttoned sewing machine 1 includes a sewing machine main body 2 and a presser arm 3 having a base end side portion (rear end side portion) pivotally supported by a bed portion 2 a of the sewing machine main body 2 so as to move up and down. The arm drive mechanism 4 having a pulse motor 35 that drives the presser arm 3 up and down, and the left and right sides that can be opened and closed horizontally in the front end side portion (front end side portion) of the presser arm 3 and can hold the button BU in the closed state A pair of button gripping members 5, a gripping member opening / closing mechanism 6 for opening / closing the pair of button gripping members 5, and a portion near the button BU of the fabric W for sewing the buttons BU gripped by the pair of button gripping members 5. pressing member 7 of the needle plate 14 pressing Ru presser unit 62 on the pair with each of the bed 2a, a pair of Tokoro relative pressing portion 62 pressing the arms 3 of the pressing member 7 to the relative to the vertical direction The pair so that only a fixed amount moves Coupling mechanism 8 for movably connected against the pressing member 7 to the presser arm 3, 1 urges against the pair of pressing members 7, the pressing portion 62 of the pressing member 7 of the pair by the biasing force on the needle plate 14 and a biasing member 9 a pair of cause the pressing dough W.

  As shown in FIG. 1 to FIG. 3, the sewing machine body 2 includes a bed portion 2 a, a leg column portion 2 b erected on the rear portion of the bed portion 2 a, an arm portion 2 c extending forward from the upper portion of the leg column portion 2 b, and an arm portion. It has a head 2d provided at the front of 2c. A needle bar 10 is supported on the head 2 d so as to be movable up and down, and a sewing needle 11 is attached to the lower end of the needle bar 10. A rotary hook 13 is mounted inside the bed portion 2a, and the sewing needle 11 that moves up and down cooperates with the rotating rotary hook 13 to form a seam on the fabric W on the needle plate 14. The bed portion 2a is provided with a feed base 15 so as to be movable back and forth, and a rear end portion of the presser arm 3 is pivotally supported by a rear end portion of the feed base 15 via a shaft 15a oriented in the left-right direction. . A feed plate 16 slidably contacting the upper surface of the bed portion 2 a is fixed to the feed table 15, and a rectangular sewing hole 16 a is formed in the front portion of the feed plate 16. By a feed drive mechanism (not shown), the presser arm 3 and the feed plate 16 are integrally moved in the front, rear, left and right directions together with the feed base 15.

  As shown in FIGS. 1 and 4 to 10, the presser arm 3 includes an arm main body 20 having a rear end connected to a feed base 15, and a grip connected to a front end of the arm main body 20 by a pair of bolts 21. A pair of button gripping members 5 and a gripping member opening / closing mechanism 6 are attached to the gripping mounting base 22, and a rear end portion of the pair of presser members 7 is disposed at the lower front end of the arm body 20. They are connected via a connecting mechanism 8. An L-shaped member 26 that extends upward is attached to the front end of the arm body 20, and a hole 20 a that engages the lower end of the spring mounting rod 32 is formed on the rear side thereof.

  The arm portion 2c is provided with a spring mounting portion 32b. When the presser arm 3 moves in the front-rear direction, the spring mounting rod 32 is connected to the spring mounting portion 32b so that it can tilt, and is externally mounted on the spring mounting rod 32. A compression coil spring 33 interposed between the spring mounting portion 32 b and the flange portion 32 a below the spring mounting rod 32 is provided. This compression coil spring 33 corresponds to an arm urging means for urging the presser arm 3 in the direction in which the tip end portion of the presser arm 3 descends.

  As shown in FIGS. 1 to 10, the arm drive mechanism 4 is fixed to the compression coil spring 33, the pulse motor 35 provided in the rear cover 2e of the leg post 2b, and the output shaft 35a of the pulse motor 35. Drive gear 36, driven gear 37 meshed with drive gear 36, shaft 38 to which driven gear 37 is fixed and pivotally supported on the sewing machine frame, cam 39 fixed to shaft 38, cam 39 on the lower end supported by the sewing machine frame A first link member 41 having a square shape with a roller 40 engaged therewith, a linkage 42 having a rear end portion connected to the upper end portion of the first link member 41, and a lower end portion pivotally supported by a sewing machine frame of the arm portion 2c. The L-shaped second link member 43 to which the front end portion of the linkage 42 is connected, the square piece 44 connected to the front end portion of the second link member 43, and the square piece 44 are relatively movable in the front-rear direction. Of the arm portion 2c Vertically long operating member 45 that protrudes to the side, having an engaging engagement member 46 from the lower side horizontal portion of the lower end portion is connected to the L-shaped member 26 of the drive member 45. Note that a spring 47 that biases the first link member 41 in a direction in which the roller 40 engages with the cam 39 is also provided.

  When the pulse motor 35 is driven, the driving force is transmitted to the driving member 45 through the members 36 to 44, and the driving member 45 moves up and down. In a state where the presser portions 62 of the pair of presser members 7 are spaced upward from the needle plate 14, the fabric W is set and set off on the feed plate 16. When the drive member 45 is lowered from this state, the presser arm 3 is also lowered, and the presser portions 62 of the pair of presser members 7 are pressed onto the needle plate 14. For the arm drive mechanism 4, another actuator such as an air cylinder may be applied instead of the pulse motor 35.

Here, the engagement member 46 connected to the lower end portion of the L-shaped member 26 and the drive member 45 provided on the presser arm 3 corresponds to an arm drive connecting means for connecting the presser arm 3 and the arm drive mechanism 4. the case, the engagement member 46 is made of a relatively long roller in the longitudinal direction and is rotatably supported about an axis oriented in the longitudinal direction to the drive member 45. Accordingly, even if the presser arm 3 moves integrally with the feed base 15 in the front-rear direction and further in the left-right direction with the engaging member 46 engaged from the lower side with the horizontal portion of the L-shaped member 26, the presser The height position of the arm 3 is not changed, and the driving force by the arm driving mechanism 4 (the urging force of the compression coil spring 33) can be transmitted to the presser arm 3.

  As shown in FIGS. 4 to 10, the pair of button gripping members 5 is connected to a pair of vertical vertical pieces 50 a at the front end portions of the pair of mounting members 50 provided on the gripping mounting base 22 by screws 5 b. Each is attached. Each button gripping member 5 is formed in an L shape in a side view, and is integrally formed with a button receiver 5a protruding to the button gripping member 5 side (inside) facing the lower end portion of the front end portion of the horizontal portion. The button BU is gripped from the left and right sides at the front end portion of the button gripping member 5, and in this state, the button BU is received by the pair of button receivers 5a. In addition, a button presser member 27 composed of a pair of leaf spring members that press the button BU held by the pair of button gripping members 5 from above to the pair of button receivers 5a is provided. The members 27 are attached to the pair of button gripping members 5 by screws 27a so that their heights can be adjusted.

  As shown in FIGS. 4 to 7, 9, the gripping member opening / closing mechanism 6 includes a pair of mounting members 50 and a rear end portion of the pair of mounting members 50 disposed below the gripping mounting base 22. Are arranged below the pair of pivot shafts 51 and the pair of mounting members 50 so as to be slidable in the front-rear direction on the grip mounting base 22. A grip opening / closing operation plate 52 in which a pair of C-shaped cam grooves 52a are formed and a pair of mounting members 50 are provided in a projecting downward direction in the middle in the length direction of the pair of mounting members 50, respectively. A pair of guided cam followers 53 and a spring member 54 for urging the grip opening / closing operation plate 52 forward are provided.

  A guide hole 22a that is long in the front-rear direction is formed in the grip mounting base 22, and a stepped bolt member 55 is inserted into the grip opening / closing operation plate 52 through the guide hole 22a from the upper side. A grip opening / closing operation plate 52 is guided and supported by the base 22 so as to be movable in the front-rear direction. A stopper member 58 is fixed to the upper surface of the grip mounting base 22 by a bolt 56 and a stepped bolt 57 so that the position of the stopper member 58 is variable, and the button BU is not gripped by the pair of button gripping members 5 (non-gripping state). The head portion of the stepped bolt member 55 is engaged with the stopper member 58 from the rear side. By loosening the stepped bolt 57 and changing the position of the stopper member 58, the distance between the pair of button gripping members 5 in the non-gripping state can be adjusted.

  The distance between the pair of button gripping members 5 in the non-gripping state is adjusted to be slightly smaller than the diameter of the button BU to be gripped, and the button BU is paired with a button supply device (not shown). It is supplied so as to be press-fitted between the button gripping members 5. A pair of left and right operation portions 52b are formed at the front end of the grip opening / closing operation plate 52. The operator moves the grip opening / closing operation plate 52 backward to open the pair of button gripping members 5. Has been.

  Here, a positioning member 59 that contacts the button BU gripped by the pair of button gripping members 5 from the rear side and positions the position of the button BU in the front-rear direction is fixed to the grip opening / closing operation plate 52. The positioning member 59 moves back and forth in conjunction with opening and closing of the pair of button gripping members 5, but is gripped by the pair of button gripping members 5 and positioned by the positioning member 59 regardless of the size of the button BU. The center of the button BU is always set at a fixed position. The positioning member 59 can be omitted.

  As shown in FIGS. 4 to 10, the pair of presser members 7 are disposed on the lower side of the gripping mount 22, are long in the front-rear direction, and have a pair of presser bases 60 whose front end portion is inclined forwardly downward. And a pair of presser portions 62 integrally formed at the front end portions of the pair of presser base portions 60, and the rear end portions of the pair of presser base portions 60 are connected to the presser arm 3 via the connecting mechanism 8. Has been. The front portions of the pair of presser portions 62 are formed in a stepped thin plate shape, and the pair of button gripping members 5 are close to the thin plate portion from above so as to be openable and closable.

  As shown in FIGS. 1, 4 to 7, and 9, the coupling mechanism 8 pivots on the presser arm 3 so that the rear end portions of the pair of presser members 7 can rotate around a horizontal axis that faces in the left-right direction. A pivot shaft 70 to be supported, an engagement portion 3c provided in the presser arm 3 near the pivot shaft 70, and a rear end portion of each presser member 7 are engaged with the engagement portions 3c to press the presser member 7 Is provided with a rotation restricting portion 71 that restricts the biasing member 9 from being rotated in the rotation biasing direction.

  The pivot shaft 70 is formed of a stepped screw, and the pivot shaft 70 is inserted through the arm body 20 and the rear end portions of the pair of presser members 7 positioned so as to sandwich the front lower end portion of the arm body 20. Yes. The rotation restricting portion 71 of each presser member 7 is formed so as to extend substantially rearward from the portion of the presser member 7 that is pivotally supported by the pivot shaft 70 so that the turn restricting portion 71 is engaged from below. In addition, an engagement portion 3 c is formed in the arm body 20. The engaging portion 3 c is a bottom surface portion of the front end portion of the arm body 20. When the rotation restricting portion 71 is engaged with the engaging portion 3c, the height of the button gripping member 5 with respect to the pressing member 7 is maximized.

The pair of urging members 9 is composed of a pair of compression coil springs 9 for urging and urging the pair of presser members 7 to the fabric presser side (counterclockwise in the right side view). In order to attach these urging members 9, a vertical spring receiving portion 3a is formed at the rear portion of the arm body 20 of the presser arm 3, and the spring receiving portion 3a is provided with a pair of left and right shaft-like portions 3b extending forward. In addition, a vertical spring receiving portion 7a is formed at the rear end portion of each pressing member, and the spring receiving portion 7a is provided with a shaft-like portion 7b extending rearward. The pair of compression coil springs 9 are interposed between the spring receiving portions 3a and the pair of spring receiving portions 7a, and shaft-like portions 3b and 7b are inserted into the respective compression coil springs 9 from both sides.

  In a state where the fabric W is not pressed on the needle plate 14 by the pair of pressing members 7 due to the biasing force of the compression coil springs 9, the pair of rotation restricting portions 71 engage with the engaging portions 3c from below. Thus, the presser portions 62 of the pair of presser members 7 are separated downward from the pair of button gripping members 5, and the height of the button gripping member 5 with respect to the presser member 7 is maximized. Here, the urging force by the pair of compression coil springs 9 is set to be smaller than the urging force by the compression coil spring 33 that urges the presser arm 3 downward. Therefore, when the pair of presser portions 62 come into contact with the needle plate 14 via the fabric W by the urging force of the compression coil spring 33, the presser arm 3, that is, the pair of button gripping members with respect to the pair of presser portions 62. 5 will surely descend.

The operation and effect of the buttoned sewing machine 1 described above will be described.
The pair of button gripping members 5 is opened and closed by the gripping member opening / closing mechanism 6, the pair of button gripping members 5 are switched to the closed state, and the button BU is gripped by the pair of button gripping members 5 in the closed state. The interval between the pair of button gripping members 5 in the closed state varies depending on the size of the button BU to be gripped. The fabric W is set on the feed plate 16 with the presser arm 3 raised, and then when the presser arm 3 is lowered, the presser 62 of the pair of presser members 7 causes the pair of button gripping members 5 to move. A portion near the button BU of the fabric W to be sewn on the held button BU is pressed onto the needle plate 14, and the button BU is sewn to the fabric W by the sewing machine body 2.

  Now, the presser portions 62 of the pair of presser members 7 connected to the presser arm 3 by the connecting mechanism 8 are movable relative to the presser arm 3 in the vertical direction by a predetermined amount, and a pair of compression coil springs. 9, the pair of presser members 7 is urged by the presser portions 62 toward the fabric presser side that presses the fabric W onto the needle plate 14. That is, in a state where the pair of presser portions 62 are spaced apart from the needle plate 14, the presser portions 62 of the pair of presser members 7 are moved down to the maximum with respect to the presser arm 3, and the fabric is placed on the needle plate 14. After W is set, the presser arm 3 is lowered by the arm drive mechanism 4 in order to press the fabric W onto the needle plate 14 by the pair of pressers 62. Then, first, the pair of presser portions 62 come into contact with the needle plate 14 via the fabric W, and the fabric W is pressed onto the needle plate 14 by the pair of presser portions 62 by the urging force of the pair of compression coil springs 33. It is done.

  When this state is maintained and the presser arm 3 is further lowered against the urging force of the compression coil spring 9, a pair of presser portions 62 attached to the tip side portion of the presser arm 3 with respect to the pair of presser portions 62. The button gripping member 5 is lowered. When the pair of presser portions 62 come into contact with the needle plate 14 via the fabric W, the presser arm 3, that is, the pair of button gripping members 5 can be lowered by a predetermined amount with respect to the pair of presser portions 62. In the meantime, it is possible to adjust the height position of the button gripping member 5 with respect to the presser portion 62 by stopping the movement of the presser arm 3. In other words, the cloth W is pressed onto the needle plate 14 by the pair of press portions 62 and the height position of the button gripping member 5 with respect to the press portion 62 can be adjusted by a series of movements of lowering the presser arm 3. By the adjustment, a desired slack can be given to the seam that sews the button BU to the fabric W. In other words, it is possible to surely have an appropriate slack in the seam where the button BU is sewn to the fabric W.

  Here, an operation unit (for example, an operation panel or an operation button) that is operated to raise and lower the presser arm 3 is provided. By operating this operation unit, for example, the height of the button gripping member 5 can be adjusted step by step to adjust to any of a plurality of preset heights, Or it can comprise so that it can adjust steplessly.

  Since the presser portions 62 of the pair of presser members 7 are spaced downward from the pair of button gripping members 5 in a state where the cloth W is not pressed on the needle plate 14 by the pair of presser members 7, the presser The arm 3 is lowered, and the presser arm 3, that is, the pair of button gripping members 5 is lowered with respect to the pair of presser portions 62 from when the pair of presser portions 62 come into contact with the needle plate 14 via the fabric W. Therefore, the height position of the button gripping member 5 with respect to the presser portion 62 can be reliably adjusted.

  Since the coupling mechanism 8 has the pivot shaft 70 that pivotally supports the presser arm 3 so that the rear end portions of the pair of presser members 7 can rotate about the horizontal axis, the pair of presser members 7 is held by the presser arm 3. The presser portions 62 of the pair of presser members 7 can be moved relative to the presser arm 3 in the vertical direction. Since the urging member 9 includes a compression coil spring 9 that urges the pair of presser members 7 to rotate toward the cloth presser side, the pair of presser members 7 can be reliably moved toward the presser foot side with respect to the presser arm 3. Can be energized.

  The coupling mechanism 8 is engaged with the engaging portion 3 c provided on the presser arm 3 and the engaging portion 3 c formed on the presser member 7 so as not to rotate the presser member 7 in the rotational biasing direction of the compression coil spring 9. And the rotation restricting portion 71 that restricts the presser arm 7 so that the presser portion 62 of the pair of presser members 7 can be moved relative to the presser arm 3 by a predetermined amount relative to the presser arm 3. Can be connected. Since the compression coil spring 9 is interposed between the vertical spring receiving portion 3a formed on the presser arm 3 and the vertical spring receiving portion 7a formed on the presser member 7, the urging force of the compression coil spring 9 is applied. Transmission to the pair of presser members 7 can be ensured.

  Even if the presser arm 3 is pivotally supported by a feed base 14 provided on the sewing machine body 2 so as to be movable in the horizontal direction, and the presser arm 3 moves in the horizontal direction integrally with the feed base 14, the height of the presser arm 3 is increased. Since the presser arm 3 and the arm drive mechanism 4 are connected so that the position is not changed and the driving force by the arm drive mechanism 4 can be transmitted to the presser arm 3, the presser is integrated with the feed base 14. Even when the arm 3 is moved, the height position of the button gripping member 5 can be kept constant.

  The arm drive mechanism 4 includes a compression coil spring 33 that urges the presser arm 3 in a direction in which the tip end portion of the presser arm 3 descends, and the urging force of the pair of compression coil springs 9 is greater than the urging force of the compression coil spring 33. Since the setting is made to be small, when the pair of pressers 62 come into contact with the needle plate 14 via the fabric W by the urging force of the compression coil spring 33, the presser arm 3, The pair of button gripping members 5 can be reliably lowered. 8 and 10 show a state where the gripping height for gripping the button BU is minimum, and FIGS. 7 and 9 show a state where the gripping height is maximum.

Next, a modified example in which the above embodiment is partially modified will be described.
1] Instead of the engaging member 46, as shown in FIG. 11, a pair of upper and lower engaging members 46A that engage with the horizontal portion of the L-shaped member 26 may be provided. Each engaging member 46A is composed of a roller that is relatively long in the front-rear direction and is supported by the drive member 45 so as to be rotatable about an axial center that faces in the front-rear direction. Therefore, even when the presser arm 3 moves in the front-rear direction and further in the left-right direction integrally with the feed base 15, the height position of the presser arm 3 is not changed, and the driving force by the arm drive mechanism 4 is not changed. 3, the presser arm 3 and the arm drive mechanism 4 can be connected to each other so as to be able to transmit them. In this case, the presser arm 3 can be driven up and down by the driving force of the arm driving mechanism 4. Therefore, since the spring mounting rod 32, the spring mounting portion 32b, and the compression coil spring 33 can be omitted, the structure can be simplified and the manufacturing cost can be reduced.

2] Instead of the compression coil spring 9, a vertical compression coil spring interposed between the holding base 22 for gripping provided on the presser arm 3 and the presser member may be provided.
3] In the connecting mechanism for connecting the presser member 7 to the presser arm 3 so that the presser portions 62 of the pair of presser members 7 can move relative to the presser arm 3 by a predetermined amount relative to the presser arm 3, The holding member 22 or the button holding member 5 provided may be configured to guide and support the pressing member up and down by a predetermined amount, and an urging member for urging the pressing member 7 downward may be provided.

It is a side view of the sewing machine with a button concerning an example. It is a perspective view of the sewing machine main body of a sewing machine with a button. It is a front view of the arm drive mechanism of a sewing machine with a button. It is a perspective view of the principal part of a sewing machine with a button. It is a disassembled perspective view of the principal part of the sewing machine with a button of FIG. It is a top view of a sewing machine with a button. It is a side view of a sewing machine with a button. It is a front view of the sewing machine with a button of FIG. It is a side view of a sewing machine with a button. FIG. 10 is a front view of the buttoned sewing machine of FIG. 9. It is a side view of the principal part of the sewing machine with a button concerning the example of a change.

Explanation of symbols

BU Button W Fabric 1 Button sewing machine 2 Sewing machine body 2a Bed portion 3 Presser arm 3a Spring receiving portion 3c Engaging portion 4 Arm drive mechanism 5 Button holding member 6 Holding member opening / closing mechanism 7 Pressing member 7a Spring receiving portion 8 Connecting mechanism 9 Force member 33 Compression coil spring 35 Pulse motor 62 Presser portion 70 Pivot shaft 71 Rotation restricting portion

Claims (9)

A presser arm whose base end side portion is pivotally supported so that it can move up and down on the bed part of the sewing machine body, and a pair of presser arms that can be opened and closed in the horizontal direction and can be held in the closed state. In a button sewing machine including a button gripping member and a gripping member opening and closing mechanism for opening and closing a pair of button gripping members,
A pair of pressing members having respective presser Ru presser portion near portion on the needle plate of the bed portion of the button out of the fabric sewing gripped button buttons gripping member of said pair,
And connecting means for movable coupling the pair of the pressing member as the pressing portion of the pair of the pressing member is moved by a predetermined amount to the relative to the vertical direction relative to the pressing arm against the presser arm,
It urges against the pair of the pressing member, and biasing means causes the press the dough pressing portion of the pair of pressing members by the biasing force on the needle plate,
A presser arm driving means having an actuator for driving the presser arm up and down;
A sewing machine with a button, characterized by comprising   The button-attached sewing machine according to claim 1, wherein the actuator is a pulse motor.   The presser portions of the pair of presser members are spaced apart from the pair of button gripping members in a state where the cloth is not pressed on the needle plate by the pair of presser members. Or the sewing machine with a button as described in 2.   The said connection means has a pivot part which pivotally supports to the presser arm so that the base end part of a pair of presser member can be rotated to a periphery of a horizontal axis. Sewing machine with buttons.   5. The button-attached sewing machine according to claim 1, wherein the urging unit includes a compression coil spring that urges a pair of presser members to rotate toward the cloth presser side.   The coupling means regulates an engaging portion provided on the presser arm and a presser member that is formed on the presser member and engages with the engaging portion so as not to rotate the presser member in the rotational biasing direction of the compression coil spring. The button-attached sewing machine according to claim 5, further comprising: a rotation restricting portion.   7. The button attachment according to claim 6, wherein the compression coil spring is interposed between a vertical spring receiving portion formed on the presser arm and a vertical spring receiving portion formed on the presser member. sewing machine. The presser arm is pivotally supported by a feed base provided in the sewing machine body so as to be movable in the horizontal direction,
Even if the presser arm moves in the horizontal direction integrally with the feed base, the presser arm and presser foot can be transmitted to the presser arm without changing the height position of the presser arm and the driving force of the presser arm drive means. The button-attached sewing machine according to any one of claims 1 to 7, further comprising arm drive connection means for connecting the arm drive means. The presser arm driving means has an arm urging means for urging the presser arm in a direction in which the tip end portion of the presser arm descends,
9. The button-attached sewing machine according to claim 1, wherein an urging force by the urging means is set to be smaller than an urging force by the arm urging means.