JP4747743B2 - Sewing presser and sewing machine - Google Patents

Description

  The present invention attaches a plate member to a feed base of a sewing machine so as to be detachable, and a presser arm is rotatably connected to the plate member, and the presser arm is driven by a presser drive mechanism equipped on the feed base, The present invention relates to a cloth presser device for a sewing machine that is adapted to raise and lower the sewing machine.

  Conventionally, a buttonhole sewing machine that forms a stitch at the edge of a buttonhole of a sewing object has been provided with a feed base that is driven to move in the horizontal direction, and a plate member equipped with a needle plate is attached to the feed base. The rear end portion of the presser arm is connected to the plate member so as to be rotatable about a left-right axis. At the front end of the presser arm, there is a presser part that presses the object to be sewn against the needle plate during sewing, and this presser arm and the presser drive mechanism equipped on the feed base are linked together. The arm is driven to raise and lower the presser part.

  By the way, the plate member is configured to be detachably attached to the feed base integrally with the presser arm. For this reason, when the plate member is attached to and detached from the feed base, the presser arm and the press drive mechanism are provided. It is necessary to configure it so that it can be automatically connected and disconnected.

  For example, in the hole sewing machine of Patent Document 1, a driven lever portion that extends forward from the rear end portion of the presser arm on the lower side of the plate member is provided, and a U-shape that is open rearward is formed at the front end portion of the driven lever portion. The engaging portion is provided. The presser drive mechanism is provided with an output pin that can engage and disengage the engaging portion of the driven lever portion, an air cylinder that drives the output pin downward, and a spring member that biases the output pin upward. When the engaging portion of the presser arm is engaged with the pin, the presser arm and the presser drive mechanism are interlocked and connected.

  Here, when the plate member to which the presser arm is connected is mounted on the feed base, the plate member is inserted between the feed base and the sewing machine arm portion from the front side and the obliquely upper side, while being attached to the predetermined mounting portion of the feed base. In this case, the engaging portion of the driven lever portion is engaged with the output pin of the presser driving mechanism.

  On the other hand, the applicant of the present application includes, in addition to the presser arm, an auxiliary presser part that presses the sewing object against the needle plate when cutting a thread extending from the sewing object at the front end part, and the rear end part that A boring machine with an auxiliary presser arm connected so as to be rotatable about a direction axis has been put into practical use. In this boring machine, the auxiliary presser arm moves to the side where the auxiliary presser part rises with respect to the plate member. A spring member that rotates and urges the stopper and a stopper that restricts the upper limit position of the auxiliary presser portion by contacting from the upper side near the portion of the auxiliary presser portion that is supported by the plate member are provided.

JP 2005-118244 A

  In the case where the plate member to which the presser arm is connected is detachably attached to the feed base, such as the above-described hole sewing machine, when the plate member is attached to the feed base, the plate member mounting operation or the output pin of the presser drive mechanism Depending on the position, the plate member may be mounted on the feed base without the engagement portion of the driven lever portion engaging the output pin of the presser drive mechanism. Here, since the plate member is in the same mounting state as when the engaging portion is engaged with the output pin, and it is difficult to visually check the connecting portion between the engaging portion and the output pin, the plate member It is difficult to confirm whether or not the engaging portion is engaged with the output pin when the is attached to the feed base.

  In order to check whether or not the engaging portion is engaged with the output pin in a state where the plate member is mounted on the feed base, it is only necessary to drive the presser drive mechanism and check whether the presser portion moves up and down. At that time, the presser arm and the presser drive mechanism may be damaged. Further, even if it can be confirmed that the engaging portion is not engaged with the output pin, if the plate member is attached to the feed base with screws, it is wasteful to include the fastening / unfastening operation of the screws. Thus, a heavy load is required and the work load increases.

  It is an object of the present invention to check whether the engaging portion of the driven lever portion is engaged with the output pin of the presser drive mechanism mounted on the feed base when the plate member to which the presser arm is connected is mounted on the feed base. It is an object of the present invention to provide a sewing machine presser device capable of easily confirming whether or not, and capable of easily and reliably performing an operation of properly mounting a plate member on a feed base.

  The sewing machine presser device according to claim 1 includes a plate member provided with a needle plate detachably attached to the sewing machine feed base from the front side, and a presser portion that presses the sewing object against the needle plate at the front end portion. A sewing machine cloth having a presser arm whose end is connected to a plate member so as to be rotatable about a left-right axis, and a presser drive mechanism that is mounted on a feed base and drives the presser arm to raise and lower the presser part. In the presser device, a rear open engagement portion is provided at the front end portion of the driven lever portion extending forward from the rear end portion of the presser arm to the lower side of the plate member, and the presser drive mechanism feeds the plate member to the feed base. The engaging portion can be engaged / disengaged from the front side when attaching / detaching to and from the front side, and includes an output pin that drives the engaging portion up and down, protrudes to the lower surface side of the engaging portion, and attaches the plate member to the feed base When the engaging part is engaged with the output pin. Contact from above those in which characterized in that a projecting portion for floating the plate member from the feed base via a driven lever portion to the output pin when not.

  A driven lever that includes a rear end portion of a presser arm having a presser portion at a front end portion thereof and is connected to the plate member so as to be rotatable about a horizontal axis, and extends forward from the rear end portion of the presser arm to the lower side of the plate member. An engaging portion that is open to the rear is provided at the front end of the portion. The feed base is equipped with a presser drive mechanism equipped with an output pin. Normally, when the plate member is mounted on the feed base, the engaging portion of the driven lever portion is engaged with the output pin of the presser drive mechanism. The presser lever and the presser drive mechanism are interlocked and connected. When this presser drive mechanism is activated, the engaging part of the driven lever part is driven up and down by the output pin, and the presser lever is driven around the horizontal axis. It is rotated and the presser part moves up and down.

  By the way, when the plate member is mounted on the feed base from the front side, the engaging portion of the driven lever portion does not engage the output pin of the presser drive mechanism due to the mounting operation of the plate member, the position of the output pin of the presser drive mechanism, or the like. There is a case. In this case, the protruding portion protruding to the lower surface side of the engaging portion comes into contact with the output pin from above, so that the plate member floats from the feed base via the driven lever portion. It can be confirmed that the portion is not engaged with the output pin.

Here, the following configuration can be adopted in the invention of claim 1.
It said projection has a tapered portion to transition to the lower side as the transition from the rear end portion to the front (claim 2). A lower end taper portion is formed at the lower end portion of the taper portion so that the lower end taper portion moves upward as it moves toward the center in the length direction of the output pin. An auxiliary presser having an auxiliary presser portion at the front end that presses the sewing target against the needle plate when cutting a thread extending from the sewing target, and a rear end connected to the plate member so as to be rotatable about a horizontal axis. An arm is provided, and a rear end portion of the presser arm and the auxiliary presser arm is rotatably supported on the plate member via a common support shaft.

A spring member is provided for rotating and urging the auxiliary presser arm to the side where the auxiliary presser part rises with respect to the plate member, and the upper part of the auxiliary presser part is brought into contact with the center part of the auxiliary presser arm from the upper side in the front-rear direction. A stopper to be regulated is provided on the presser arm. The sewing machine is a buttonhole sewing machine that forms a stitch at the edge of the buttonhole of the sewing object.
According to a seventh aspect of the present invention, there is provided a sewing machine comprising the sewing machine presser device according to any one of the first to sixth aspects.

  According to the presser foot device for the sewing machine of the first aspect, in particular, the engagement portion protrudes to the lower surface side of the engagement portion that is open to the rear of the driven lever portion, and the engagement portion is driven to press when the plate member is mounted on the feed base. When the plate member is mounted on the feed base, a protrusion is provided that comes into contact with the output pin from above when the mechanism does not engage with the output pin of the mechanism and lifts the plate member from the feed base via the driven lever portion. It is possible to easily confirm whether or not the engaging portion is engaged with the output pin without visually observing the connecting portion between the engaging portion and the output pin. As a result, the plate member can be appropriately attached to the feed base. The mounting work can be easily and reliably performed.

According to the presser unit of the sewing machine according to claim 2, protrusions, because it has a tapered portion to transition from the rear end to the lower side as shifts forward, when mounting the plate member to the feed base, a driven Even if the engaging part of the part lever part comes into contact with the output pin of the presser drive mechanism from above, the plate member moves along the taper part provided in the engaging part by its own weight. Therefore, the plate member can be easily mounted on the feed base.
According to the presser unit of the sewing machine according to claim 3, since the formation of the lower tapered portion to transition upward enough to shift the output pin to the lower end of the tapered portion to the central longitudinal side, of the drive Dore bar unit Even if the engaging portion comes into contact with the output pin of the presser drive mechanism from above, the plate member moves along the lower end taper portion of the lower end portion of the taper portion due to the weight of the plate member, so that the plate member becomes the feed base. It can be easily attached.

  According to the cloth presser device for a sewing machine of claim 4, the front end portion is provided with an auxiliary presser portion that presses the sewing object against the needle plate when the thread extending from the sewing object is cut, and the rear end portion is formed in the left-right direction with respect to the plate member. Since the auxiliary presser arm that is pivotally connected around the axis of the arm is provided, the presser part is retracted so that the presser part does not interfere with the thread cutting cutter, and the auxiliary presser part holds the sewing object against the needle plate. Thus, the thread extending from the sewing object can be reliably cut, and the rear ends of the presser arm and the auxiliary presser arm are rotatably supported on the plate member via a common support shaft. A structure in which the arm and the auxiliary presser arm are rotatably connected to the plate member can be simplified.

  According to the sewing presser device of the fifth aspect of the invention, the spring member for rotating and urging the auxiliary presser arm to the side where the auxiliary presser part ascends with respect to the plate member is provided, and the upper part is provided at the center in the front-rear direction of the auxiliary presser arm. Since the stopper arm is provided with a stopper that regulates the upper limit position of the auxiliary presser part from the upper side, it can be securely held at an appropriate upper limit position when the auxiliary presser part is not used. When attaching to and detaching from the feed base, the auxiliary drive lever portion extending from the rear end portion of the auxiliary presser arm to the lower side of the plate member is held in an appropriate positional relationship with respect to the plate member. The plate member can be attached and detached reliably without interfering with the auxiliary presser drive mechanism mounted on the feed base for driving the plate.

According to the presser foot device for the sewing machine of the sixth aspect, since the sewing machine is a buttonhole sewing machine that forms a stitch at the edge of the buttonhole of the sewing object, the plate member in the buttonhole sewing machine is used as a feed base. Thus, it is possible to easily and surely perform the work of properly attaching to the camera.
According to the sewing machine of the seventh aspect, since the cloth presser device for a sewing machine according to any one of the first to sixth aspects is provided, the same effects as those of the first to sixth aspects are obtained.

  The presser foot device of the present embodiment is applied to a buttonhole sewing machine that forms a seam at the edge of a buttonhole of a sewing object, and the rear end portion of the presser arm is attached to a plate member that can be attached to and detached from a feed base in the horizontal direction. An engagement portion that is open to the rear is provided at the front end portion of the driven lever portion that extends forward from the rear end portion of the presser arm to the lower side of the plate member. When the plate member is mounted on the feed base, and the engaging part does not engage the output pin of the presser drive mechanism equipped on the feed base, the projecting part becomes the output pin. The plate member is configured to be lifted from the feed base through contact with the driven lever portion from above.

  As shown in FIG. 1, the eyelet sewing machine 1 is configured by integrally including a bed portion 2 having a substantially rectangular box shape and an arm portion 3 extending forward from the upper side. The eyelet sewing machine 1 is mounted on a sewing machine table. The sewing machine table is provided with a sewing machine motor, an operation panel for various operations, a stepping start / stop switch, and the like, and controls the operation of various mechanisms. A control device including a microcomputer is provided.

  A needle bar 5 (see FIG. 3) with a sewing needle 4 attached to the lower end portion is provided at the front end portion of the arm portion 3, and the main shaft provided on the arm portion 3 is rotated by a sewing machine motor, and the rotational force of the main shaft is reduced. It is transmitted to the needle bar 5 via a cam mechanism or the like, and the needle bar 5 is driven up and down while swinging in the horizontal direction. The bed portion 2 is provided with a looper base having two loopers, and these loopers are driven by adjusting the vertical movement of the needle bar 5 by the rotational force of the main shaft transmitted through a cam mechanism or the like. . Further, the needle bar 5 and the looper base are integrally rotated around the vertical axis by a rotation mechanism having a stepping motor provided in the bed portion 2.

  In order to form a button hole in the sewing object, a punch is attached to the bed 2 on the rear side of the looper base so as to be detachably attached to the mounting base by a bolt. The main body is swingably provided, and a hammer is detachably attached to the tip of the hammer main body.

  Now, as shown in FIGS. 2 to 8, on the upper surface side of the bed portion 2, a feed base 6 for setting a sewing object to be used for sewing and button hole drilling is provided. Two sets of moving mechanisms each having a stepping motor are provided inside the bed portion 2, and the feed base 6 is independently driven in the X direction (left-right direction) and the Y direction (front-back direction) by these moving mechanisms. .

  The feed base 6 has a thin rectangular box shape as a whole, and a pair of metal rectangular plate-like fixing plates 10 are fixedly provided on the left and right sides of the top surface of the feed base 6. A pair of left and right metal rectangular plate-like cross plates 11 (corresponding to plate members) are detachably mounted between the fixed plates 10 from the front side. The pair of cross plates 11 are mounted in a state where they are positioned on the feed base 6 with a slight gap left and right, and positioning pins 7a project upward from the feed base 6 for positioning. A pin hole 7 b into which the positioning pin 7 a is inserted is formed in the cross plate 11.

A pair of throat plates 13 are respectively attached to the opposed inner end side portions of the pair of cross plates 11 and at the center in the front-rear direction, and the inner end edges of the pair of throat plates 13 are formed in the eyelet sewing machine. 1 is formed in a shape along the shape of the eyelet stitched seam to be sewn. In a state in which the sewing object in the feed table 6 is set, when performing sewing on the sewing object, when forming the button sewing object, when cutting the thread extending from the sewing object after sewing, the presser foot The sewing object is pressed against the needle plate 13 by the device 7.

Next, the presser foot device 7 will be described.
As shown in FIGS. 2 to 8, the presser foot device 7 presses the sewing object against the needle plate 13 when the sewing is performed on the pair of cross plates 11 and the sewing object and when the button hole is formed. A pair of left and right main presser arms 15 each having a main presser portion 14 at the front end portion and a rear end portion connected to a pair of cross plates 11 so as to be rotatable about a left and right axis are provided on the feed base 6. In addition, a pair of main presser drive mechanisms 16 that respectively drive the pair of main presser arms 15 to raise and lower the pair of main presser portions 14 are provided. The main presser portion 14, the main presser arm 15, and the main presser drive mechanism 16 correspond to the presser portion, the presser arm, and the presser drive mechanism in the claims.

  Further, the cloth presser device 7 is provided on the right side of the main presser arm 15 on the right side, and has an auxiliary presser portion 17 that presses the sewing object against the needle plate 13 when cutting the thread extending from the sewing object at the front end. And an auxiliary presser arm 18 whose rear end is connected to the right plate member 11 so as to be rotatable about a left-right axis, and the feed base 6 is mostly equipped and drives the auxiliary presser arm 18 to assist. An auxiliary presser drive mechanism 19 for raising and lowering the presser unit 17 is provided.

  The pair of main presser portions 14 have front and rear lengths slightly shorter than the needle plate 13, and their opposing inner end edges are formed in the same shape as the inner end edges of the pair of needle plates 13. The sewing object is pressed against the inner part of the needle plate 13. The auxiliary presser portion 17 is formed in a pin shape, and presses the sewing target in a spot manner to the front right portion of the right throat plate 13 (a portion different from the portion where the main presser portion 14 presses the sewing target).

  A support block 20 is fixed to the rear end portion of the left cross plate 11, and the rear end portion of the left main presser arm 15 is rotatably supported by a support shaft 21 that is fixed to the support block 20 in the horizontal direction. Has been. Further, a support block 22 is fixed to the rear end portion of the right cross plate 11, and the rear end portion of the right main presser arm 15 can be rotated around a support shaft 23 fixed in the left-right direction fixed to the support block 22. The rear end of the auxiliary presser arm 18 is rotatably supported on the support shaft 23 on the right side of the main presser arm 15. As described above, the rear end portions of the main presser arm 15 and the auxiliary presser arm 18 are rotatably supported by the cross plate 11 via the common support shaft 23.

  Each main presser arm 15 is integrally provided with a main drive lever portion 25 that extends forward from the rear end portion under the cross plate 11. The main drive lever portion 25 has a longitudinal length that is approximately half that of the main presser arm 15, and a U-shaped engagement portion that is open rearward at the lower side of the front end portion of the main drive lever portion 25. 26 is provided. The auxiliary presser arm 18 is provided with an auxiliary drive lever portion 29 that extends downward and forward from the rear end portion thereof in an inclined manner.

  Each main presser drive mechanism 16 includes a rearward-facing air cylinder 30 whose base end is rotatably connected to a feed base body 6a of the feed base 6 via a support shaft 30a, and an output rod 31 of the air cylinder 30. And a fixed drive member 32. Further, each main presser drive mechanism 16 is connected to a rotation shaft member 33 in the left-right direction supported rotatably on the feed base body 6a, and a lower end portion thereof rotatably connected to the drive member 32 via a pin 34a. And a link member 34 having an upper end fixed to the outer end portion of the rotation shaft member 33. Further, each main presser drive mechanism 16 includes an output lever 35 that is fixed to the inner end portion of the rotation shaft member 33 and extends forward, an output pin 36 that is provided on the front end portion of the output lever 35 in the left-right direction, A return spring member 37 that biases the drive member 32 forward is provided.

  When the cross plate 11 is attached to and detached from the feed base 6, the engaging portion 26 can be engaged with and disengaged from the output pin 36 from the front side. Note that the driven lever unit 25 and the output lever 35 are in a position where they are wrapped in the left-right direction and do not interfere with each other.

  When the air cylinder 30 is driven and the output rod 31 is protruded in a state where the engaging portion 26 is engaged with the output pin 36 (see FIG. 6), the driving member 32, the link member 34, the rotating shaft member 33, and the output The output pin 36 moves downward through the lever 35 to drive the engaging portion 26 downward, and the main presser arm 15 is rotated clockwise around the support shaft 23 in FIG. 14 descends and is pressed against the needle plate 13. When the air cylinder 30 is stopped from this state, the main presser arm 15 is rotated counterclockwise about the support shaft 23 in FIG. 6 by the urging force of the return spring member 37, and the presser portion 14 is raised. To do.

  The auxiliary presser drive mechanism 19 includes a rearwardly facing air cylinder 40 whose base end is rotatably connected to the feed base body 6a via a support shaft 40a, and a drive member fixed to the output rod 41 of the air cylinder 40. 42, a substantially vertical output lever 43 whose upper end is rotatably supported by the feed base body 6a via a support shaft 43a and whose lower end is rotatably connected to a drive member 42 via a pin 43b. , And an output pin 44 in the left-right direction fixed to the central portion in the length direction of the output lever 43. These are disposed at positions where they do not interfere with the main presser drive mechanism 16, and return spring members (not shown) that urge the auxiliary presser arm 18 to rotate toward the side on which the auxiliary presser part 17 is raised with respect to the cross plate 11. ).

  The output lever 43 and the auxiliary drive lever portion 29 wrap in the front-rear direction, and when the cross plate 11 is completely attached to the feed base 6, the auxiliary drive lever portion 29 is positioned behind the output pin 44. It will be in the state. When the air cylinder 40 is driven and the output rod 41 is protruded, the output pin 44 moves rearward through the drive member 42 and the output lever 43 to drive the auxiliary drive lever portion 29 to the rear side. The auxiliary presser arm 18 is rotated clockwise around the support shaft 23 in FIG. 6, and the auxiliary presser portion 17 is lowered and pressed against the needle plate 13. In this state, when the air cylinder 40 is stopped driving, the auxiliary presser arm 18 is rotated counterclockwise around the support shaft 23 in FIG. To rise.

Here, in the front-rear direction central portion of the right side of the main presser arm 15, a stopper 15a for restricting an upper limit position location of the auxiliary presser portion abuts from above in the front-rear direction central portion of the auxiliary presser arm 18 is provided.

Now, as shown in FIGS. 6 to 8, the engaging portion 26 of the driven lever portion 25 protrudes to the lower surface side of the engaging portion 26 and the cross plate 11 is mounted on the feed base 6. When the engaging portion 26 does not engage with the output pin 36, a protruding portion 27 is provided that contacts the output pin 36 from above and floats the cross plate 11 from the feed base 6 via the driven lever portion 25. . The protruding portion 27 has a tapered portion 27a to move to the lower side as the transition from the rear end portion to the front, FIG. 9, as shown in FIG. 10, the lower end of the tapered portion 27a, the output pin 36 A taper portion 27b that moves upward as it moves toward the center in the length direction is formed. For example, the lateral width of the projecting portion 27 is relatively narrower than the lateral width of the driven lever portion 25 and the engaging portion 26, and the projecting portion 27 may be the outer end portion (the inner end portion) of the engaging portion 26. ) On the lower surface side.

  Here, the output pin 36 moves up and down within a predetermined range, and FIG. 7 shows a state where the output pin 36 is located at the lower limit position. Further, the main presser arm 15 is configured to rotate within a predetermined range, and FIG. 7 shows a state where the main presser arm 15 is located at a limit position rotated counterclockwise around the support shaft 23. In this state, when the projecting portion 27 comes into contact with the output pin 36 from above, the lower projecting amount of the projecting portion 27 so that the cross plate 11 floats from the feed base 6 by a predetermined amount (for example, about 5 mm). Is set.

The operation and effect of the presser foot device 7 will be described.
Normally, in a state in which the cross plate 11 is mounted on the feed base 6, the engaging portion 26 of the driven lever portion 25 is engaged with the output pin 36 of the main press driving mechanism 16, and the main press lever 15 and the main presser are engaged. When the main presser drive mechanism 16 is operated in conjunction with the drive mechanism 16 via the main drive lever portion 25, the engaging portion 26 of the main drive lever portion 25 is driven up and down by the output pin 36. The main presser lever 15 is driven and rotated around the support shaft 23 to raise and lower the presser portion 14.

  By the way, when the cross plate 11 is mounted on the feed base 6 from the front side, the engagement portion 26 of the driven lever portion 25 outputs depending on the mounting operation of the cross plate 11 and the position of the output pin 36 of the main press drive mechanism 16. The pin 36 may not be engaged. Conventionally, even in this case, the cross plate 11 is in the same mounting state as the case where the engaging portion 26 is engaged with the output pin 36, and when the cross plate 11 is mounted on the feed base 6, Since it is difficult to visually check the connection portion between the engaging portion 26 and the output pin 36, it is difficult to check whether the engaging portion 26 is engaged with the output pin 36 or not.

  Therefore, in the presser foot device 7 of the present proposal, as shown in FIG. 7, the engaging portion 26 is engaged with the output pin 36 when protruding to the lower surface side of the engaging portion 26 and the cross plate 11 is attached to the feed base 6. In the case where they do not match, the projecting portion 27 that abuts the output pin 36 from above and floats the cross plate 11 from the feed base 6 via the main drive lever portion 25 is provided, so that the cross plate 11 is attached to the feed base 6. In this case, it is possible to easily confirm whether or not the engaging portion 26 is engaged with the output pin 36 without visually observing the connection portion between the engaging portion 26 and the output pin 36. It is possible to easily and reliably perform the operation of properly mounting the plate 11 on the feed base 6.

Protrusions 27, upper higher because it has a tapered portion 27a to move to the lower side as the transition from the rear end portion to the front, also moves to the lower end of the tapered portion 27a to the central longitudinal side of the output pins 36 When the cross plate 11 is mounted on the feed base 6, the engaging portion 26 of the driven lever portion 25 does not engage with the output pin 36 of the presser driving mechanism 16. The cross plate 11 moves along the taper portion 27a and the lower end taper portion 27b provided in the engaging portion 26 by the own weight of the cross plate 11. Accordingly, the contact between the engaging portion 26 and the output pin 36 can be released, and the work of properly mounting the cross plate 11 on the feed base 6 can be easily and reliably performed.

  When the thread extending from the sewing object is cut, an auxiliary presser portion 17 that holds the sewing object against the needle plate 13 is provided at the front end portion, and the rear end portion is rotatable about the left and right support shafts 23 on the cross plate 11. Since the connected auxiliary presser arm 18 is provided, the main presser part 14 is lifted and retracted so that the main presser part 14 does not interfere with the thread cutting cutter, and the auxiliary presser part 17 presses the sewing object onto the needle plate 13. Thus, the thread extending from the sewing object can be reliably cut, and the rear end portions of the main presser arm 15 and the auxiliary presser arm 18 are pivotally supported on the cross plate 11 via the common support shaft 23. A structure in which the main presser arm 15 and the auxiliary presser arm 18 are rotatably connected to the cross plate 11 can be simplified.

  A spring member is provided for turning and biasing the auxiliary presser arm 18 to the side where the auxiliary presser part 17 is raised with respect to the cross plate 11, and abuts against the center part of the auxiliary presser arm 18 in the front-rear direction from above. Since the stopper 15a for restricting the upper limit position is provided on the presser arm 15, the auxiliary presser portion 17 can be securely held at an appropriate upper limit position when not used, and the cross plate 11 is attached to the feed base 6. When attaching and detaching, the auxiliary drive lever portion 29 extending from the rear end portion of the auxiliary presser arm 18 to the lower side of the cross plate 11 is held in an appropriate positional relationship with respect to the cross plate 11. Can be reliably attached / detached without interfering with the output pin 44 of the auxiliary presser drive mechanism 19 provided in the feed base 6 for driving it. That. Further, when the auxiliary presser portion 17 is used, when the stopper 15a is provided as compared with the case where the stopper 15a is not provided, the rotation amount for pressing the sewing object against the needle plate 13 can be reduced, and the next operation can be started. You can expedite.

  In addition, although the case where the present invention was applied to the eyelet sewing machine 1 was described, the present invention can be applied to various industrial sewing machines such as a lockstitch sewing machine equipped with a presser foot device, and the present invention has been described above. The present invention is not limited to the embodiments, and those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention. It includes forms.

It is a perspective view of an eyelet hole sewing machine. It is a perspective view of a feed stand and a cloth presser. It is a front view of a feed stand and a presser foot device. It is a top view of a feed stand and a cloth presser. It is a bottom view of a feed stand and a cloth presser. It is a longitudinal cross-sectional view of a feed stand and a presser foot device (state normally connected). It is a longitudinal cross-sectional view of a feed stand and a presser foot device (state which is not normally connected). It is a perspective view from the bottom face side of a feed stand and a presser foot device (state which is not normally connected). It is a front view of the engaging part of a main presser arm, and the principal part of an output pin. It is a front view of the engaging part of a main presser arm, and the principal part of an output pin.

1 Eyelet-drilling sewing machine
6 feeding table 11 cross plate 13 needle plate 14 main holding portion 15 Shuosae arm 15a stopper Pas
1 6 Main presser drive mechanism 17 Auxiliary presser portion 18 Auxiliary presser arm 19 Auxiliary presser drive mechanism 23 Support shaft 26 Engagement portion 36 Output pin 27 Projection portion 27a Taper portion 27b Lower end taper portion

Claims (7)

A plate member provided with a needle plate that is detachably mounted on the sewing machine feed base from the front side, and a presser part that presses the sewing object against the needle plate are provided at the front end portion, and the rear end portion is pivoted to the plate member around the horizontal axis. A presser arm for a sewing machine, comprising: a presser arm that is rotatably connected to the presser base; and a presser drive mechanism that is provided on the feed base and that drives the presser arm to raise and lower the presser part.
A rear open engagement portion is provided at the front end portion of the driven lever portion extending forward from the rear end portion of the presser arm on the lower side of the plate member,
The presser drive mechanism includes an output pin that allows the engaging portion to be engaged and disengaged from the front side when the plate member is attached to and detached from the feed base, and drives the engaging portion up and down.
The plate protrudes to the lower surface side of the engaging portion and comes into contact with the output pin from above when the engaging portion does not engage the output pin when the plate member is mounted on the feed base via the driven lever portion. A cloth presser device for a sewing machine, comprising a protrusion for floating a member from a feed base. The protrusion sewing machine presser foot according to claim 1, characterized in that it comprises a tapered portion to transition from the rear end to the lower side as shifts forward.   3. The sewing machine presser device according to claim 2, wherein a lower end taper portion that moves upward as it moves toward the lengthwise center of the output pin is formed at the lower end portion of the taper portion.   An auxiliary presser having an auxiliary presser portion at the front end for pressing the sewing target against the needle plate when cutting a thread extending from the sewing target, and a rear end connected to the plate member so as to be rotatable about a left-right axis. The sewing machine according to any one of claims 1 to 3, wherein an arm is provided, and a rear end portion of the presser arm and the auxiliary presser arm is rotatably supported by a plate member via a common support shaft. Presser foot device.   A spring member is provided for rotating and urging the auxiliary presser arm to the side where the auxiliary presser part rises with respect to the plate member, and the upper part of the auxiliary presser part is brought into contact with the center part of the auxiliary presser arm in the front-rear direction from above. 5. The sewing machine presser device according to claim 4, wherein a stopper for regulating is provided on the presser arm.   The sewing machine cloth presser according to any one of claims 1 to 5, wherein the sewing machine is a buttonhole sewing machine that forms a stitch at an edge portion of a buttonhole of a sewing object.   A sewing machine comprising the cloth presser device for a sewing machine according to any one of claims 1 to 6.