JP4284610B2 - Sewing machine presser foot - Google Patents

Description

  The present invention relates to a cloth presser device for a sewing machine.

  Conventionally, in the bar-tacking sewing machine, the base end of the presser arm on the pedestal side is supported by the bed so as to be movable in the horizontal direction, and the presser lever is supported by the presser arm so as to be rotatable about the horizontal axis. Has been. The presser foot is connected to the tip of the presser lever, and in this state, the presser lever is rotated to move the presser foot between the presser position where the work cloth is pressed against the bed and the retracted position where the presser foot is lifted from the presser position. Is lifted up and down. Regarding the presser foot, a plurality of types of presser foot are prepared and can be exchanged according to the size and shape of the tacking seam to be sewn.

  For this purpose, the mounting member is fixed to the distal end portion of the presser arm, and the upper vertical piece of the presser foot is engaged with the vertical engaging portion formed on the mounting member. The presser plate is attached to the mounting member with screws so that the tip of the presser lever is engaged with the upper vertical piece and the upper vertical piece is not detached from the engaging part. When replacing the presser foot, loosen the screw from the mounting member and remove the presser plate, then remove the presser foot, then engage the upper vertical piece of the presser foot to be used with the engaging part of the mounting member, Attach the presser plate to the mounting member and tighten the screw to complete.

  By the way, in Patent Document 1, without removing the presser plate from the mounting member, the connection between the presser foot and the presser lever is released, the presser foot is removed so as to be pulled upward from the mounting member, and the presser foot is attached to the mounting member. A technique for mounting so as to be inserted from above is disclosed. Further, in Patent Document 2, a guide member is fixed to the distal end portion of the presser arm, and the presser foot is engaged with a vertical engagement portion formed on the guide member so as to be raised and lowered. On the other hand, a technique is disclosed in which the presser foot can be replaced by a locking pin or the like.

JP-A-9-285667 Japanese Patent No. 2844443

  When replacing the presser foot in a conventional bar clamp sewing machine, loosen the screw from the mounting member, remove the presser plate, remove the presser foot, and then attach the upper vertical piece of the presser foot to be used to the mounting member. In the case where the presser plate is attached to the mounting member and the screw is tightened by engaging with the engaging portion, the work of replacing the presser foot is very troublesome. Therefore, as in Patent Document 1, if the presser foot and the presser lever are disconnected from each other without removing the presser plate from the mounting member, and the presser foot can be attached to and detached from the mounting member, the work for replacing the presser foot is simplified. .

  However, the jaw portion provided at the distal end portion of the arm portion of the sewing machine projects downward, and the mounting member is located below the jaw portion. When replacing the presser foot, the presser foot is removed so as to be pulled out from the mounting member, and the presser foot is attached to the mounting member so as to be inserted from the upper side. There is also a possibility that the jaw and the presser foot interfere with each other. Patent Document 2 is not a technique for attaching / detaching the presser foot to / from the guide member, but a technique for attaching / detaching the presser foot to / from the presser foot that is mounted on the guide member so as to be movable up and down.

  An object of the present invention is to allow the presser foot to be easily attached to and detached from the recessed member without obstructing the jaw portion of the sewing machine, so that the work of replacing the presser foot can be performed easily and reliably. Is to provide a device.

  According to a first aspect of the present invention, a sewing machine cloth presser device includes a bed portion provided with a thread loop catching mechanism, a leg column portion standing on the bed portion, and protruding above the bed portion from the upper portion of the leg column portion. A presser foot device used in a sewing machine having an arm portion and a jaw portion that protrudes downward at a tip portion of the arm portion and is provided with a needle bar that cooperates with the thread catching mechanism, The presser foot that presses the work cloth to the bed part below, and one end part on the pedestal side is supported by the bed part so as to be movable in the horizontal direction, and the presser foot is attached to and detached from the other end part on the jaw part side In a presser foot device having a presser arm provided with a mounting mechanism for free mounting, the mounting mechanism includes a recess member in which a recess into which a part of the presser foot is inserted is formed, and a recess of the recess member. A closing member that closes the opening, and the closing member closes the opening A support member that movably supports the closing member over a closed position and a spaced position that is separated from the opening, and a fixing mechanism that releasably fixes the closing member supported by the support member to the closed position. It is characterized by comprising.

  The presser arm has one end on the pedestal side that is supported by the bed so as to be movable in the horizontal direction, and a mounting mechanism is provided on the other end on the jaw side, and the presser foot is detachably mounted on the mounting mechanism. The The mounting mechanism includes a dent member, a blocking member, a support member, and a fixing mechanism. When a part of the presser foot is inserted into the dent formed in the dent member and the blocking member supported by the support member is positioned at the closed position. The opening of the recess of the recess member is closed by the closing member, and the closing member is fixed to the closing position by the fixing mechanism, and the presser foot is detachably mounted on the mounting mechanism.

  Here, multiple types of presser foot are prepared according to the size and shape of the seam to be sewn, and when the presser foot is replaced, the closure member is released from the fixing mechanism and supported by the support member. The closing member is moved from the closing position to the separated position. Then, a part of the presser foot can be attached to and detached from the recess of the dent member. First, a part of the presser foot is removed from the dent, and then a part of the presser foot to be used is inserted into the dent, and then the support member. The closing member supported by the movement member is moved from the separated position to the closing position, and the closing member is fixed at the closing position by the fixing mechanism.

  A cloth presser device for a sewing machine according to a second aspect of the present invention is the sewing machine according to the first aspect, wherein the concave portion of the concave member is engaged with a part of the presser foot so as to be detachably engaged to the opposite side of the leg post. It is formed in the engaging part of direction. In a state where the blocking member is located at the separated position, a part of the presser foot is attached to and detached from the engaging part of the recessed member from the opposite side to the leg column part, and a part of the presser foot is engaged with the engaging part, In the state where the closing member is located at the closing position, the presser foot is guided so as to be movable up and down.

  The cloth presser device for a sewing machine according to claim 3 is the invention according to claim 1, wherein the recess of the recess member is detachably engaged in a direction in which a part of the presser foot intersects the length direction of the bed portion. It is characterized in that it is formed in the vertical engaging portion. In a state where the closing member is located at the separated position, a part of the presser foot is attached to and detached from the engaging part of the recessed member from the side crossing the length direction of the bed part, and a part of the presser foot is engaged with the engaging part. The presser foot is guided to be raised and lowered in a state where the closing member is positioned at the closing position.

  The cloth presser device for a sewing machine according to a fourth aspect of the present invention is the sewing machine according to any one of the first to third aspects, wherein the support member rotates the end of the closing member around the horizontal axis or the vertical axis about the recessed member. It is characterized by being freely pivoted. The closing member supported by the support member is rotated about the horizontal axis or the vertical axis, and moves between the closed position and the separated position.

  The cloth presser device for a sewing machine according to claim 5 is the sewing machine according to any one of claims 1 to 4, wherein the fixing mechanism is capable of engaging with a locking member movably mounted on the recess member and the locking member. A locking hole formed in the blocking member; a biasing member that biases the locking member in a direction to engage the locking hole; and a biasing member that is provided on the locking member and resists the biasing force of the biasing member. And an operating portion for operating the locking member from the locking hole in the direction of releasing the engagement. In a state where the closing member is located at the closing position, the locking member movably attached to the dent member is urged by the biasing member and engages with a locking hole formed in the closing member, and the blocking member Is fixed at the closed position, and when the operating portion provided on the locking member is operated to disengage the locking member from the locking hole against the biasing force of the biasing member, the presser foot is moved from the closed position. Unpinned.

  A cloth presser device for a sewing machine according to a sixth aspect of the present invention is the sewing machine according to any one of the first to fourth aspects, wherein the fixing mechanism is closed so as to be engageable with a fastening member mounted on the recessed member and a shaft portion of the fastening member. It has the notch hole formed in the member, It is characterized by the above-mentioned. When the notch hole formed in the closing member engages with the shaft portion of the fastening member mounted on the recess member, the fastening member is tightened in this state, the closing member is fixed at the closing position, and the fastening member is loosened. The presser foot is released from the closed position.

  According to the presser foot device of the sewing machine according to claim 1, in particular, one end portion of the presser arm on the side of the pedestal is supported by the bed portion so as to be movable in the horizontal direction, and is attached to the other end portion of the presser arm on the jaw portion side. A mechanism is provided, and the mounting mechanism has a dent member, a blocking member, a support member, and a fixing mechanism, so that the fixing of the blocking member by the fixing mechanism is released, and the blocking member supported by the support member is separated from the closed position. In this state, it is possible to attach and detach a part of the presser foot to the recess of the recess member, and switch between the closing position and the separation position of the closing member, and fixing and releasing the locking member at the closing position. It can be done easily. In other words, the presser foot can be easily attached to and detached from the mounting mechanism, and the work to replace the presser foot can be performed easily and reliably, with the jaw part protruding downward at the tip of the arm part of the sewing machine being almost unobstructed. Become.

  According to the cloth presser device for a sewing machine according to claim 2, the recess of the recess member is a vertical engagement portion in which a part of the presser foot is detachably engaged with the pedestal portion in the opposite direction. Therefore, a part of the presser foot can be attached to and detached from the engaging part of the dent member from the opposite side to the pedestal part with the closing member positioned at the separated position. Since the presser foot is guided so as to be able to move up and down in a state where the portion is engaged with the engaging portion and the closing member is positioned at the closed position, the presser foot can be surely raised and lowered.

  According to the presser foot device for a sewing machine according to claim 3, the dent of the dent member has a longitudinal direction in which a part of the presser foot is detachably engaged in a direction crossing the length direction of the bed portion. Since it is formed in the engaging portion, a part of the presser foot can be attached to and detached from the engaging portion of the recessed member from the direction crossing the length direction of the bed portion in a state where the closing member is located at the separation position. The presser foot can be lifted and lowered with the part of the presser foot engaged with the engaging part and the closing member is positioned at the closed position. become.

  According to the presser device for a sewing machine according to a fourth aspect of the present invention, the support member pivotally supports the end of the closing member so as to be rotatable about the horizontal axis or the vertical axis on the recessed member. By rotating the supported closing member around the horizontal axis or around the vertical axis, the closing member can be moved reliably between the closed position and the separated position, and the structure for the pivot is also provided. Therefore, the manufacturing cost is advantageous.

  According to the presser device for a sewing machine of the fifth aspect, since the fixing mechanism includes the locking member, the locking hole, the urging member, and the operation portion, the dent member is in a state where the closing member is located at the closing position. The locking member movably mounted on the locking member is urged by the urging member to engage with the locking hole formed in the closing member, so that the closing member is securely fixed at the closing position, and is provided on the locking member. By operating the operated portion, the engagement member can be released from the engagement hole against the urging force of the urging member, and the presser foot can be easily released from the closed position. Together with this fixing release operation, the closing member can be switched from the closing position to the separation position.

  According to the cloth presser device for a sewing machine of the sixth aspect, since the fixing mechanism has the fastening member and the notch hole, the notch hole formed in the closing member in the state where the closing member is located at the closing position. It is possible to engage the shaft portion of the fastening member mounted on the recess member and tighten the fastening member in this state to securely fix the closing member at the closing position. When the fastening member is loosened, It can be easily released from the closed position. The fixing mechanism has a simple structure having a fastening member attached to the recess member and a notch hole formed in the closing member, which is advantageous in terms of manufacturing cost.

  The sewing machine presser device of the present embodiment is applied to a tacking sewing machine that forms a tacking seam on a work cloth, and a presser foot that presses the work cloth onto a bed part below the jaw part of the sewing machine. The presser arm has a presser arm provided with a mounting mechanism that is movably supported in the horizontal direction on the bed and is provided with a mounting mechanism for detachably attaching the presser foot to the other end of the sewing machine jaw. The mechanism includes a dent member in which a dent into which a part of the presser foot is inserted is formed, a closing member that closes the opening of the dent of the dent member, a closing position where the closing member closes the opening, and a separation that separates from the opening. And a fixing mechanism for releasably fixing the closing member supported by the supporting member to the closing position.

Hereinafter, Example 1 of the present invention will be described with reference to FIGS. In the following description, the arrow a in FIG.
As shown in FIGS. 1 to 3, the tacking sewing machine 1 includes a bed part 2, a leg pillar part 3 standing on the rear part of the bed part 2, and a bed part extending forward from the upper part of the leg pillar part 3. 2 has an arm portion 4 projecting upward, and a jaw portion 5 projecting downward at the tip portion of the arm portion. In addition, the front part of the bed part 2 is a free arm, and a cylinder can be sewn.

  A needle bar 6 is provided on the jaw 5 so as to be movable up and down, a sewing needle 7 is attached to the lower end of the needle bar 6, and an upper thread extending from a thread spool as a predetermined upper thread supply source is provided with a predetermined thread hook. It is supplied to the sewing needle 7 via the section and the balance. A rotary hook 8 corresponding to a thread loop catching mechanism is provided inside the bed portion 2, and the lower thread extends from a bobbin that is a lower thread supply source inside the rotary hook 8, and the needle bar 6 and the rotary hook 8 are connected to each other. In cooperation, a stitch is formed on the work cloth by the upper thread and the lower thread.

  As shown in FIGS. 1 to 3, the presser foot device 10 of the barbed sewing machine 1 includes a feed plate 11 provided on the upper surface of the bed 2 so as to be movable in the horizontal direction, and a lower part of the jaw 5. The presser foot 12 for pressing the work cloth to the feed plate 11 of the bed portion 2 on the side, the presser arm 13 whose rear base end portion on the side of the pedestal column portion 3 is supported by the bed portion 2 so as to be movable in the horizontal direction, and the presser foot A mounting mechanism 14 provided at the front end of the arm 13 on the jaw 5 side and on which the presser foot 12 is detachably mounted, and a presser foot lifting mechanism 15 for moving the presser foot 12 up and down; A connection release mechanism 16 for releasing the connection of the presser foot lifting mechanism 15 and a cloth feed mechanism (not shown) for feeding the work cloth are provided.

  4 to 8, the presser foot 12 includes a pair of left and right upper vertical pieces 12a, a pair of left and right connecting pieces 12b extending from the lower ends of the upper vertical pieces 12a, and the connecting pieces. A pair of upper vertical pieces 12a, and a pair of connecting holes 41 is formed. The presser foot 12 includes a left presser foot 12L and a right presser foot 12R which are divided into left and right, and a plurality of types of presser feet 12 are prepared according to the size and shape of the tacking seam to be sewn. , Can be exchanged.

  The presser arm 13 includes a vertical portion 13a that extends upward from the lower end portion, a horizontal portion 13b that extends forward from the upper end portion of the vertical portion 13a, and an inclined portion 13c that extends downward from the front end portion of the horizontal portion 13b. A mounting mechanism 14 is provided at the front end of the inclined portion 13c. On the horizontal portion 13b of the presser arm 13, a pair of left and right presser levers 31 of the presser foot raising / lowering mechanism 15 is rotatably supported via a support shaft 30 extending in the left-right direction that penetrates the presser arm 13. The engagement end portion 42 formed at the front end portion of the presser lever 31 engages with the pair of connecting holes 41 of the presser foot 12 mounted on the mounting mechanism 14 from the rear side, and the presser foot 12 and the presser foot. The lifting mechanism 15 is connected.

The mounting mechanism 14 will be described in detail.
As shown in FIGS. 4 to 8, the mounting mechanism 14 is fixedly provided at the front end portion of the presser arm 13 and a pair of upper vertical pieces 12 a that are a part of the presser foot 12 are inserted (engaged). A mounting member 20 (corresponding to a dent member) formed with a pair of left and right engaging portions 20a, which is a recess, a closing member 21 for closing the opening of the engaging portion 20a of the mounting member 20, and a closing member 21 A pair of left and right supports for movably supporting the closing member 21 over the closed position shown in FIG. 8 where the opening of the engaging portion 20a is closed and the spaced position shown in FIG. 5 which is separated from the opening of the engaging portion 20a. A pivot screw member 22 that is a member, and a fixing mechanism 23 that releasably fixes the closing member 21 supported by the pivot screw member 22 to the closing position shown in FIG. 4 are provided.

  The pair of engaging portions 20a of the mounting member 20 is formed in a vertical direction in which the pair of upper vertical pieces 12a of the presser foot 12 are detachably engaged with the leg column portion 3 on the opposite side (front side). ing. These engaging portions 20a are formed over the upper and lower ends of the mounting member 20, and the left and right widths and depths thereof are substantially the same as the left and right widths and the thickness in the front-rear direction of the upper vertical piece 12a of the presser foot 12. In addition, a vertically long notch hole is formed in the rear portion of each engaging portion 20a of the mounting member 20, and the engaging end portion 42 passes through the notch hole so that the front end portion of the presser lever 31 can move up and down. Is engaged with the connecting hole 41 of the presser foot 12 from the rear side.

  The closing member 21 includes a plate-like portion 21a covering the front surface of the mounting member 20 at the closing position, a pair of left and right pivot pieces 21b extending rearward from both left and right ends of the upper end portion of the plate-like portion 21a, and a plate-like portion 21a. It has a pair of left and right engaging pieces 21c extending rearward from the left and right ends of the lower end. A pair of pivot pieces 21b are in contact with the side surface of the upper end portion of the mounting member 20 from both left and right sides, and a pair of pivot screws in which these pivot support pieces 21b are screwed to the upper end portion of the mounting member 20 in the left-right direction. The member 22 is pivotally supported so as to be rotatable around a horizontal axis. In addition, the resistance at the time of rotating the obstruction | occlusion member 21 can also be adjusted by turning the pivot screw member 22 with a screwdriver.

  The pair of engaging pieces 21c are in contact with the side surface of the lower end portion of the mounting member 20 from the left and right sides in a state where the closing member 21 is located at the closed position, and these engaging pieces 21c are mounted by the fixing mechanism 23. The closing member 21 is fixed to the closing position by being fixed to the member 20. The plate-like portion 21a of the closing member 21 is formed with a pair of left and right longitudinal elongated holes 21d. When the closing member 21 is located at the closing position, it protrudes forward when the presser foot 12 is raised. The engaging end portion 42 of the presser lever 31 is inserted into the elongated hole 21d so as not to interfere with the plate-like portion 21a.

  The fixing mechanism 23 includes a locking pin 25 corresponding to a pair of left and right locking members movably mounted on the mounting member 20 and a pair of engagements of the closing member 21 so that the locking pins 25 can be engaged with each other. A pair of locking holes 26 formed in the piece 21c, a compression coil spring 27 that is a biasing member that biases the pair of locking pins 25 in a direction to engage with the pair of locking holes 26, and 1 A pair of operations for operating the pair of locking pins 25 in the direction of releasing the engagement from the pair of locking holes 26 against the biasing force of the compression coil spring 27 provided on the pair of locking pins 25 Part 25a.

  At the lower end portion of the mounting member 20, there are formed a through hole 20e that is long in the left-right direction and an opening 20f that communicates with the through hole 20e and opens downward. The left and right length of the opening 20f is approximately the same as the left and right length of the mounting member 20. 1/2 length. A base end portion of each locking pin 25 is formed in an operation portion 25a that protrudes downward. The pair of locking pins 25 are engaged with the through holes 20e with the operation portions 25a facing each other, and the operation portions 25a are disposed so as to protrude downward from the openings 20f. A compression coil spring 27 is housed in the through hole 20e.

  The pair of locking pins 25 are urged by the compression coil spring 27, and the operation portions 25a are locked to the edge of the opening 20f of the mounting member 20. In this state, When the end portion protrudes to the outside of the mounting member 20 and the closing member 21 is located at the closing position as shown in FIG. 4, the outer end portions of the locking pins 25 are connected to the pair of closing members 21. The closing member 21 is fixed at the closing position by engaging with the locking hole 26 of the joining piece 21c. From this state, when the operating portions 25a of the pair of locking pins 25 are operated and moved so as to approach each other against the biasing force of the compression coil spring 27, the outer end portions of the pair of locking pins 25 are moved. Retreating into the mounting member 20 and releasing the engagement from the pair of locking holes 26, the closing member 21 is released from the closing position.

  As shown in FIGS. 1 to 8, the presser foot raising / lowering mechanism 15 is a pair of left and right pressers supported on a midway in the length direction of the presser arm 13 via a support shaft 30 so as to be rotatable about a horizontal axis. A lever 31, a pair of left and right urging members 32 for urging the presser foot 12 toward the presser position shown in FIG. 2, and a retraction shown in FIG. 3 against the urging force of the urging member 32. And an ascending drive unit 33 for raising the position. In the presser lever 31, the presser lever front part 31 a on the front side of the support shaft 30 extends along the presser arm 13, and the rear ends of a pair of presser lever rear parts 31 b extending substantially rearward from the support shaft 30 have left and right 1 parts. The upper end portions of the pair of guide shafts 34 are rotatably connected to each other.

  The pair of guide shafts 34 are vertically arranged on the rear side of the vertical portion 13 a of the presser arm 13, and the lower shaft portions thereof are connected to a pair of left and right mounting portions 35 formed at the rear end portion of the presser arm 13. Each is slidably inserted. Each guide shaft 34 is provided with an urging member 32 made of a compression coil spring, and the urging member 32 urges the presser lever rear portion 31b upward. The ascending drive unit 33 is provided on the arm unit 4, and the ascending drive unit 33 drives the pushing portion 33 a downward to push the protruding portion 31 c provided on the presser lever rear portion 31 b downward. It should be noted that the height position of the protrusion 31c can be adjusted.

  As shown in FIGS. 4 to 11, the connection release mechanism 16 includes a slide mechanism 40 that slides the pair of presser levers 31 in the front-rear direction with respect to the presser arm 13 and a pair of connections formed on the presser foot 12. A pair of engagement end portions 42 formed at the front end portions of the pair of presser levers 31 so as to engage with the connection holes 41 so as to be disengageable; A set screw 43 that can be held in a state of being engaged with the pair of connecting holes 41 and in a state of being disengaged is provided. The set screw 43 can be rotated by a hexagon wrench.

  The slide mechanism 40 includes a support shaft 30, a pair of left and right fulcrum changing plates 44 that are in contact with the outer surfaces of the pair of presser levers 31, and a pair of set screws 43. Each presser lever 31 and fulcrum changing plate 44 are formed with a long hole 46a and a round hole 46b facing each other, a tap hole 47a and a long hole 47b are formed facing each other, and the support shaft 30 is formed with a long hole 46a. And the shaft portion 45 of the set screw 43 is engaged with the elongated hole 47b, and the base end screw portion is screwed into the tap hole 47a. With the set screw 43 loosened, the presser lever 31 is slid back and forth with respect to the presser arm 13 to change the position of the support shaft 30 (fulcrum) with respect to the presser lever 31, and the engagement end 42 is connected. 4 can be switched to the position of FIG. 5 engaged with the hole 41, and the set screw 43 can be tightened and held at the positions of FIG. 4 and FIG. 5, respectively.

The operation and effect of the presser foot device 10 will be described.
With the pair of upper vertical pieces 12a of the presser foot 12 engaged with the vertical engaging portion 20a of the mounting member 20, the presser foot 12 is in a state where the closing member 21 is fixed to the closed position by the fixing mechanism 23. The sliding mechanism 40 slides the pair of presser levers 31 forward and engages the engagement end 42 at the front end of the pair of presser levers 31. However, the presser foot 12 and the presser foot lifting mechanism 15 are connected in a state where the presser foot 12 is engaged with the pair of connecting holes 41, and the presser foot 12 is lifted and lowered by the presser foot lifting mechanism 15 in this state.

  In the presser lifting / lowering mechanism 12, the pair of presser levers 31 is pivotally biased about the support shaft 30 by the pair of biasing members 32, and the presser foot 12 is applied to the feed plate 11 as shown in FIG. 2. The presser foot 12 is pressed, and the work cloth is pressed against the feed plate 11 by the presser foot 12. When performing sewing, in this state, the presser foot 12, the presser arm 13, the presser lever 31 and the like are integrally driven by the cloth feed mechanism to feed the work cloth.

  When removing the work cloth pressed by the presser foot 12 or newly pressing the work cloth with the presser foot 12, the presser lifting mechanism 33 drives the presser portion 33a downward in the presser lifting mechanism 12, and the presser motion The protrusions 31c of the pair of presser levers 31 are pushed downward by the portion 33a. As a result, the pair of presser levers 31 are rotated about the support shaft 30 against the biasing force of the biasing member 32, and the presser foot 12 is lifted from the presser position as shown in FIG. become.

  When the presser foot 12 is replaced, the operation portion 25a of the pair of locking pins 25 is operated, and the pair of locking pins 25 are moved so as to approach each other against the biasing force of the compression coil spring 27. . Then, the outer end portions of the pair of locking pins 25 retreat into the mounting member 20 to disengage from the locking holes 26 of the pair of engaging pieces 21c of the closing member 21, and the closing member 21 is closed. Unfixed from position. In this state, the closing member 21 is rotated around the pivotal screw member 22 to switch to the separated position spaced forward upward as shown in FIG.

  When the closing member 21 is set to the separated position, the front side of the pair of engaging portions 20a of the mounting member 20 is opened, and in this state, the pair of upper vertical pieces 12a of the presser foot 12 are removed from the pair of engaging portions 20a. Remove to the front side. Here, before the presser foot 12 is removed, the pair of set screws 43 are loosened in the connection release mechanism 16, and the pair of presser levers 31 are slid rearward by the slide mechanism 40. The engagement end portion 42 of the presser foot 12 is disengaged from the pair of connection holes 41 of the presser foot 12 to release the connection between the presser foot 12 and the presser foot lifting mechanism 15.

  In order to remove the presser foot 12, it is not essential to release the connection between the presser foot 12 and the presser foot lifting mechanism 15 by the connection release mechanism 16. That is, the connection release mechanism 16 is not essential and can be omitted. Next, the pair of upper vertical pieces 12a of the presser foot 12 to be used is attached to the pair of engaging portions 20a from the front side. Next, after engaging the engagement end portion 42 with the connection hole 41, the operation portion 25 a of the pair of locking pins 25 is operated, and the outer end portions of the pair of locking pins 25 are moved into the mounting member 20. When the closing member 21 is switched from the separated position to the closing position and the operation portion 25a is released in the state where the closing member 21 is retracted, the pair of locking pins 25 are paired with the closing member 21 by the urging force of the compression coil spring 27. The closing member is fixed at the closing position by engaging with the locking hole 26 of the engaging piece 21c.

  According to this presser foot device 10, in particular, the rear base end portion of the presser arm 13 is supported by the bed portion 2 so as to be movable in the horizontal direction, and the mounting mechanism 14 is provided at the front end portion of the presser arm 13. 14 includes the mounting member 20, the closing member 21, the pivotal screw member 22, and the fixing mechanism 23, so that the closure of the blocking member 21 by the fixing mechanism 23 is released, and the blocking member 21 supported by the pivotal screw member 22 is removed. The pair of upper vertical pieces 12a of the presser foot 12 can be attached to and detached from the pair of engaging portions 20a of the mounting member 20 while being moved from the closed position to the separated position. Switching between the position and the separated position, and fixing and releasing of the closing member 21 at the closing position can be easily performed. That is, the presser foot 12 can be easily attached to and detached from the mounting mechanism 14 and the replacement work of the presser foot 12 can be easily and reliably performed without causing the jaw portion 5 to become an obstacle.

  Since the pair of engaging portions 20a are formed in a vertical direction in which the pair of upper vertical pieces 12a of the presser foot 12 are detachably engaged to the front side, the closing member 21 is positioned at the separated position. Thus, the pair of upper vertical pieces 12a of the presser foot 12 can be attached and detached from the front side of the pair of engaging portions 20a, and the pair of upper vertical pieces 12a of the presser foot 12 can be attached to the pair of engaging portions 20a. Since the upper vertical piece 12a of the presser foot 12 is guided so as to be able to move up and down with the closing member 21 being in the closed position, the presser foot 12 can be reliably lifted and lowered.

  Since the pivotal screw member 22 pivotally supports the upper end of the closing member 21 on the mounting member 20 so as to be rotatable around the horizontal axis, the pivotal member 21 supported by the pivotal screw member 22 is rotated around the horizontal axis. By rotating, it can be moved reliably between the closed position and the separated position, and the structure for the pivot can be simplified, which is advantageous in terms of production cost.

  Since the fixing mechanism 23 includes the locking pin 25, the locking hole 26, the compression coil spring 27, and the operation portion 25a, the engagement mechanism 21 is movably mounted on the mounting member 20 in a state where the closing member 21 is located at the closed position. The locking pin 25 is urged by the compression coil spring 27 to engage with the locking hole 26 formed in the closing member 21, so that the closing member 21 is securely fixed at the closed position and is provided on the locking pin 25. By operating the operating portion 25a, the locking pin 25 can be released from the locking hole 26 against the biasing force of the compression coil spring 27, and the presser foot 12 can be easily released from the closed position. In particular, the closing member 21 can be switched from the closed position to the separated position together with the fixing release operation.

In addition, you may change the cloth presser apparatus 10 of Example 1 partially as follows.
1] Instead of the pivot support screw member 22, the closure member 21 may be pivotally supported by the pivot shaft so as to be rotatable between the closed position and the separated position.
2] The support member may be configured to pivotally support the left end portion or the right end portion of the closing member about the vertical axis about the mounting member 20.

3] The closing member 21 may be configured to be linearly movable in the vertical direction or the front-rear direction across the closed position and the separated position. For example, as shown in FIGS. 12A and 12B, 20 that closes the engaging portion 20a of the mounting member 20 is mounted on the mounting member 20 by a guide pin 21e that is a support member, and is supported by the guide pin 21e. The closing member 20 may be configured to be movable in the front-rear direction over the closing position shown in FIG. 12A and the separation position shown in FIG.

3] In the fixing mechanism 23, as in Example 2 described below, a fastening member attached to the attachment member, and a notch hole formed in the closing member so as to be engageable with a shaft portion of the fastening member You may comprise in what has. In this case, when the closing member is in the closing position, the notch hole is engaged with the shaft portion, and in this state, the fastening member can be tightened to fix the closing member in the closing position, and the fastening member is loosened. The closure member 21 can be released from the closed position.

Next, a second embodiment of the present invention will be described with reference to FIGS. However, basically the same components as those in the first embodiment are denoted by the same reference numerals and will be briefly described.
This cloth presser device 10A includes a feed plate 11, a presser foot 12, a presser arm 13, a mounting mechanism 14A, a presser foot lifting mechanism 15, a connection release mechanism 16, and a cloth feed mechanism 17, and the mounting mechanism 14A is mounted according to the first embodiment. The structure is different from that of the mechanism 14.

The mounting mechanism 14A will be described in detail.
The mounting mechanism 14A is a pair of left and right engagements that are fixedly provided at the front end of the presser arm 13 and are recesses into which a pair of upper vertical pieces 12a that are a part of the presser foot 12 are inserted (engaged). The mounting member 50 (corresponding to a dent member) in which the portion 50a is formed, the pair of left and right blocking members 51 that respectively close the openings of the pair of engaging portions 50a of the mounting member 50, and the closing member 51 are engaged. A pair of left and right sides movably supports the pair of closing members 51 over the closed position shown in FIG. 13 where the opening of the portion 50a is closed and the spaced position shown in FIG. 14 which is separated from the opening of the engaging portion 50a. And a fixing mechanism 53 for releasably fixing the pair of closing members 51 supported by the pair of pivoting screw members 52 to the closing position shown in FIG. ing.

  The pair of engaging portions 50a of the mounting member 50 are detachably engaged with the pair of upper vertical pieces 12a of the presser foot 12 in the direction (the left and right sides) intersecting the length direction (front and rear direction) of the bed portion 3. It is formed in the vertical engaging portion 50a to be joined. These engaging portions 50a are formed over the upper and lower ends of the mounting member 50, and the left and right widths and depths thereof are substantially the same as the left and right widths of the upper vertical piece 12a of the presser foot 12 and the thickness in the front-rear direction. A vertically long notch hole is formed in the rear portion of each engagement portion 50a of the mounting member 50, and the engagement end portion 42 passes through the notch hole so that the front end portion of the presser lever 31 can move up and down. Is engaged with the connecting hole 41 of the presser foot 12 from the rear side.

  The mounting member 50 has a vertically long convex portion 50b that protrudes forward in the center in the left-right direction, and a pair of engaging portions 50a are formed on the left and right ends of the convex portion 50b. A vertically long presser plate 54 is fixed to the front end surface of the convex portion 50b. The vertically long presser plate 54 protrudes slightly to the front side of the pair of engaging portions 50a. The closing member 51 has the same vertical length as the mounting member 20, and each closing member 51 has a pressing portion 51 a that slightly protrudes to the front side of the engaging portion 50 a in a state where the closing member 51 is located at the closing position. Is formed. That is, the upper vertical piece 12a of the presser foot 12 engaged with the engaging portion 50a in a state where the closing member 51 is located at the closing position is moved forward or left or right by the holding plate 54 and the closing member 51. It will not come off.

  The upper end portions of the pair of closing members 51 are disposed on the left and right sides of the mounting member 20, and the horizontal shaft centers are provided by pivotal screw members 52 in which each closing member 51 is screwed to the upper end portion of the mounting member 50 in the left-right direction. It is pivotally supported so that it can rotate freely. In addition, the resistance at the time of rotating the closing member 51 can be adjusted by turning the pivotal screw member 52 with a screwdriver.

  Each fixing mechanism 53 includes a fastening member 55 attached to the lower end portion of the side portion of the attachment member 50, and a notch hole formed in the lower end portion of the closing member 51 so as to be engageable with the shaft portion 55a of the fastening member 55. 56. The notch hole 56 is notched from the fastening member 55 side, and when the notch hole 56 engages with the shaft portion 55a of the fastening member 55, the closing member 51 becomes the closing position. When the fastening member 55 is tightened with the notch hole 56 engaged with the shaft portion 55a of the fastening member 55, the closing member 51 is fixed at the closing position, and when the fastening member 55 is loosened, the closing member 51 is moved from the closing position. Unpinned.

The operation and effect of the presser foot device 10A will be described.
When replacing the presser foot 12, for each closing member 51, loosen the fastening member 55, release the closing member 51 from the closing position, rotate the closing member 51 around the pivotal screw member 52, As shown in FIG. 14, the position is switched to a separated position spaced upward in the forward direction. When the closing member 51 is set to the separated position, the side surface side of the engaging portion 50a is opened, and in this state, the left presser foot 12L of the presser foot 12 or the upper vertical piece 12a of the right presser foot 12R is left or right from the engaging portion 50a. Remove to.

  Here, before removing the upper vertical piece 12a, in the connection release mechanism 16, the pair of set screws 43 are loosened, and the pair of presser levers 31 are slid rearward by the slide mechanism 40. The engagement end portion 42 of the presser 31 is disengaged from the pair of engagement end portions 42 of the presser lever 31 to release the connection between the presser foot 12 and the presser foot lifting mechanism 15. At this time, the set screw 43 may be tightened to hold the presser lever 31 in this disengagement position.

  Next, the upper vertical piece 12a of the left presser foot 12L or the right presser foot 12R of the presser foot 12 to be used is attached to the engaging portion 50a from the left side or the right side. Thereafter, when the closing member 51 is switched from the separated position to the closing position, the notch hole 56 of the closing member 51 is engaged with the shaft portion 55a of the fastening member 55, and when the fastening member 55 is tightened in this state, the closing member 51 is engaged. Is fixed in the closed position.

  According to the presser foot device 10A, the pair of engaging portions 50a of the mounting member 50 is a pair of vertically oriented portions in which the pair of upper vertical pieces 12a of the presser foot 12 are detachably engaged to the left and right sides. Since it is formed in the engaging portion 50a, the upper vertical piece 12a of the presser foot 12 can be attached to and detached from the engaging portion 50a of the mounting member 50 from the left side or the right side in a state where the closing member 51 is located at the separated position. The upper vertical piece 12a of the presser foot 12 can be moved up and down with the pair of upper vertical pieces 12a of the presser foot 12 engaged with the pair of engaging portions 50a and the closing member 51 positioned at the closed position. Therefore, the presser foot 12 can be surely raised and lowered.

  Since the fixing mechanism 53 includes the fastening member 55 and the notch hole 56, the notch hole 56 formed in the closing member 51 is attached to the attachment member 50 in a state where the closing member 51 is located at the closing position. The fastening member 55 is engaged with the shaft portion 55a of the fastening member 55, and the fastening member 55 is fastened in this state, so that the closing member 51 can be securely fixed at the closing position 51. When the fastening member 55 is loosened, the closing member 51 is It can be easily released from the closed position. The fixing mechanism 53 has a simple structure including a fastening member 55 attached to the attachment member 50 and a notch hole 56 formed in the closing member 51, which is advantageous in terms of manufacturing cost. In addition, the same effects as those of the first embodiment are obtained.

In addition, you may change the cloth presser apparatus 10A of Example 2 partially as follows.
1] Instead of the pivot support screw member 52, the closure member 51 may be pivotally supported by a pivot shaft so as to be rotatable between a closed position and a separated position.
2] The closing member 51 may be configured to be linearly movable in the up-down direction, the front-rear direction, or the left-right direction over the closed position and the separated position.

3] In the fixing mechanism 53, as in the first embodiment, a pair of left and right locking members that are movably mounted on the mounting member 50, and these locking members are formed on the closing member 51 so as to be engageable with each other. A pair of locking holes, a biasing member that biases the pair of locking members in a direction to engage the pair of locking holes, and a biasing force of the biasing member provided in the pair of locking members In contrast to this, the pair of locking members may be configured to have a pair of operation portions for operating the pair of locking members in a direction of releasing the engagement from the pair of locking holes.

  In addition, the presser foot device 10 according to the first embodiment and the presser foot device 10A according to the second embodiment can be implemented by adding various structures without departing from the spirit of the present invention. The cloth presser device can be applied to various bar-tacking sewing machines or various sewing machines other than bar-tacking sewing machines.

1 is a perspective view of a tacking sewing machine according to a first embodiment of the present invention. FIG. 6 is a side view of the tacking sewing machine (when the presser foot is lowered). FIG. 6 is a side view of the tacking sewing machine (when the presser foot is raised). It is a side view of a presser foot device (presser foot connected state). It is a side view of a presser foot device (presser foot connection release state). It is a front view of a presser foot device. It is a bottom view of the presser foot device. It is a side view of a cloth presser device (state where a closure member is a separation position). It is a side view of a presser lever and a slide mechanism. It is a side view of a presser lever. It is a side view of a fulcrum change board. It is a perspective view of a mounting member (closed state). It is a perspective view of a mounting member (open state). It is a side view of the presser foot device concerning Example 2 of the present invention. It is a side view of a cloth presser device (state where a closure member is a separation position). It is a front view of a presser foot device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Retaining sewing machine 8 Rotating shuttle 2 Bed part 3 Leg column part 4 Arm part 5 Jaw part 6 Needle bar 10, 10A Work clamp device 12 Presser foot 12a Upper vertical piece 13 Presser arm 14, 14A Mounting mechanism 20, 50 Mounting member 20a , 50a Engaging portion 21, 51 Closure member 22, 52 Pivoting screw member 23, 53 Fixing mechanism 25 Locking pin 25a Operation portion 26 Locking hole 27 Compression coil spring 55 Fastening member 55a Shaft portion 56 Notch hole

Claims (6)

A bed portion provided with a thread catching mechanism, a pedestal portion standing on the bed portion, an arm portion projecting upward from the upper portion of the pedestal portion, and a tip portion of the arm portion A presser foot device used in a sewing machine having a jaw portion protruding downward and provided with a needle bar that cooperates with the thread loop capturing mechanism,
A presser foot that presses the work cloth to the bed part below the jaw part, and one end part on the pedestal part side is supported by the bed part so as to be movable in the horizontal direction, and the presser foot is supported on the other end part on the jaw part side. In a presser foot device having a presser arm provided with a mounting mechanism for detachably mounting a foot,
The mounting mechanism is
A dent member in which a dent into which a part of the presser foot is inserted is formed;
A closing member for closing the opening of the recess of the recess member;
A support member that movably supports the closing member over a closing position where the closing member closes the opening and a spaced position apart from the opening;
A fixing mechanism for releasably fixing the closing member supported by the support member to the closing position;
A presser device for a sewing machine, comprising:   2. The dent of the dent member is formed in a vertical engagement portion in which a part of the presser foot is detachably engaged to the opposite side to the pedestal portion. The sewing machine presser device according to the description.   The dent of the dent member is formed in a vertical engagement portion in which a part of the presser foot is detachably engaged in a direction side intersecting the length direction of the bed portion. Item 2. A sewing machine presser device according to Item 1.   The sewing machine according to any one of claims 1 to 3, wherein the support member pivotally supports an end of the closing member so as to be rotatable about a horizontal axis or a vertical axis about the recessed member. Presser foot device.   The fixing mechanism includes a locking member that is movably mounted on the recess member, a locking hole formed in the closing member so that the locking member can be engaged, and a locking member that engages the locking hole. A biasing member that biases in the direction, and an operating portion that is provided on the locking member and operates in a direction to release the engagement of the locking member from the locking hole against the biasing force of the biasing member. The sewing machine cloth presser device according to any one of claims 1 to 4, wherein: The said fixing mechanism has the fastening member with which the dent member was mounted | worn, and the notch hole formed in the obstruction | occlusion member so that engagement with the axial part of this fastening member was carried out, The any one of Claims 1-4 characterized by the above-mentioned. The cloth presser device for a sewing machine according to claim 1.