JP7354882B2 - Presser foot mounting structure - Google Patents

Description

The present invention relates to a mounting structure for a presser foot in a sewing machine in which the presser foot is configured to be removably attached to a presser bar.

Generally, in a sewing machine, a presser foot for pressing a workpiece such as cloth is attached to a presser bar provided on the sewing machine main body side. The presser foot has an appropriate shape depending on the type of sewing process such as regular sewing or embroidery sewing, the type and thickness of the workpiece, etc., and these multiple types of presser feet can be used against the presser foot. There are sewing machines with interchangeable configurations. Conventionally, a configuration in which the presser bar and the presser foot are fastened together using screws or the like has often been used, but there has been a problem in that it takes time and effort to replace them. Therefore, a structure for attaching a presser foot to a presser bar with the aim of facilitating the work of replacing the presser foot is described in the following patent document.

Patent No. 4932102 Utility Model Publication No. 3-103081

The presser foot mounting structure described in Patent Document 1 can be attached by simply pulling the presser foot up against the presser bar, and can be removed by pulling the presser foot down while pressing the button. It is configured as follows. However, each component of the mounting structure has a complicated and special shape, and in particular, the mounting part of the presser foot has a special shape, making it difficult to apply it to existing sewing machines. is difficult. Further, since the presser foot has only a small claw engaged with the presser bar, it cannot be said that the presser foot is sufficiently attached to the presser bar. Furthermore, in the presser foot mounting structure described in Patent Document 2, only a small claw provided on the presser bar side engages with the presser foot, so this mounting structure also prevents the presser foot from attaching to the presser bar. It is hard to say that the installation is sufficient. Furthermore, since the mounting structures described in Patent Documents 1 and 2 use an elastic material to engage the claws, there is a possibility that the engagement due to the elastic force may loosen due to vibrations caused by the operation of the sewing machine.

The present invention has been made in view of such circumstances, and has a simple configuration that allows the presser foot to be easily attached and detached, and also ensures that the presser foot is securely attached to the presser bar when the presser foot is attached to the presser bar. An object of the present invention is to provide a mounting structure for a presser foot that can be supported.

In order to solve the above problems, the presser foot mounting structure of the present invention is as follows:
A presser foot mounting structure for a sewing machine in which the presser foot is removably attached to a presser bar,
One of the presser bar and the presser foot has a shaft portion extending in the vertical direction, and a convex portion protruding outward from the outer peripheral surface of the shaft portion,
The other of the presser bar and the presser foot includes a cylindrical portion opening on the one side in the vertical direction, a guide groove formed on the outer peripheral surface of the cylindrical portion and opening on the one side in the vertical direction, and the cylinder. a movable member disposed on the outside of the part so as to be movable between a first state and a second state; By inserting the part, it is possible to insert and remove the one,
By bringing the movable member into the first state with the convex portion inserted into the innermost end of the guide groove, the movable member locks the convex portion and the guide groove of the convex portion the presser foot is attached to the presser bar;
By bringing the movable member into the second state, the convex portion is unlocked by the movable member, allowing the convex portion to move along the guide groove, and the presser foot is moved to the presser bar. It is characterized by being removable from the .

A sewing machine that employs this presser foot attachment structure can attach the presser foot to the presser bar by simply inserting the presser foot into the presser bar and moving the movable member from the second state to the first state. Furthermore, the presser foot can be removed from the presser bar simply by moving the movable member from the first state to the second state and pulling out the presser foot. In other words, the presser foot mounting structure having this configuration allows the presser foot to be easily attached to and removed from the presser bar. In addition, with this mounting structure, when the presser foot is attached to the presser bar, the convex portion is restrained from moving in any direction by the inner peripheral surface at the innermost end of the guide groove and the movable member. Therefore, a situation in which the presser foot falls off the presser bar can be avoided, and the presser foot can be reliably supported on the presser bar.

In the mounting structure having this configuration, the shapes of the shaft portion and the cylindrical portion are not limited, and may be circular or polygonal in cross section. Furthermore, in the mounting structure having this configuration, the guide groove is not limited to a linear one. For example, if the shaft part is formed in a cylindrical shape and the cylinder part is formed in a cylindrical shape, so that they can rotate relative to each other around the axis, the guide groove may have a curved or bent shape. can. In that case, the presser foot can be inserted and removed while being rotated relative to each other, or the presser foot can be installed by inserting the presser foot linearly in the vertical direction and then rotating relatively, and then the presser foot can be installed by linearly inserting the presser foot in the vertical direction and then rotating it relatively. It is also possible to have a configuration that allows it to be pulled out.

In the mounting structure having this configuration, the movable member is configured to restrain the convex portion from moving in the opening direction of the guide groove in the first state, and for example, the movable member is in contact with the opening side of the convex portion in the first state. configuration can be adopted. The movable member may be provided so as to be linearly movable between a first position (first state) and a second position (second state), and may be provided so as to be linearly movable between a first rotational position (first state) and a second position (first state). It may be provided so as to be rotatable between two rotational positions (second state). Alternatively, the structure may be such that it can move on the outer circumferential surface of the cylindrical portion and come into contact with a convex portion that protrudes from the outer circumferential surface of the cylindrical portion, or it may have a structure that can enter into a guide groove and come into contact with the convex portion. There may be. Furthermore, the movable member is not limited to one that can be operated by the user. For example, the movable member can be configured to be biased from the second state toward the first state by a biasing member or the like, and with such a configuration, the movement of the convex portion is restrained. This is a configuration that can maintain the following.

In the above configuration, the shaft portion has a cylindrical shape, the cylindrical portion has a cylindrical shape, and the innermost end of the guide groove extends in the circumferential direction on the outer peripheral surface of the cylindrical portion. The movable member may be configured to have an extending circumferential groove, and the movable member may be configured to restrict movement of the convex portion in the circumferential direction in the first state.

In this mounting structure, the convex part is inserted into the innermost part of the circumferential groove, so that the convex part is restrained from moving in the vertical direction, and the presser foot is prevented from moving in the axial direction (vertical direction) with respect to the presser bar. is prohibited. In other words, it is possible to avoid a situation where the presser foot falls off from the presser bar. In addition, the movable member restricts movement of the convex portion within the circumferential groove, and therefore can restrict relative rotation between the shaft portion and the cylinder portion, that is, rotation of the presser foot around the axis with respect to the presser bar. Therefore, with this mounting structure, the presser foot can be more reliably supported with respect to the presser bar.

Furthermore, in the above configuration, the other member may include a biasing member that biases the movable member in a direction in which it moves from the second state toward the first state.

With this mounting structure, the movable member can be maintained in the first state by the biasing force of the biasing member, so the movable member can reliably lock the convex portion, and the presser foot can be attached to the presser bar. can be supported more reliably. Note that the type and shape of the biasing member are not particularly limited, and an appropriate biasing member can be adopted depending on the shape of the movable member and the movable method.

In the above configuration, when the presser foot is attached to the presser bar, as the convex portion enters the guide groove, the convex portion abuts the movable member and moves the movable member to the The movable member is moved from the first state to the second state against the biasing force of the biasing member, and when the convex portion reaches the innermost end of the guide groove, the movable member resists the biasing force of the biasing member. The configuration may be such that the device operates from the second state to the first state.

With this mounting structure, when attaching the presser foot to the presser bar, the movable member can be moved from the first state to the second state by simply aligning the protrusion with the guide groove and inserting the presser foot into the presser bar. By retracting the movable member and inserting the protrusion to the innermost part of the guide groove, locking of the protrusion by the movable member is completed. Therefore, with this mounting structure, the presser foot can be more easily attached to the presser bar.

In the above configuration, the convex portion is configured such that its tip protrudes outward from the outer circumferential surface of the cylindrical portion when inserted into the guide groove, and the movable member is arranged along the axis of the cylindrical portion. It can be configured to be a plate-shaped member disposed on the cylindrical portion so as to extend on a plane that is parallel and intersects the tip of the convex portion, and to be movable on the plane.

In the mounting structure of this configuration, even if the movable member is arranged outside the cylindrical part, the dimension that protrudes outward from the cylindrical part in the direction orthogonal to the above plane is only the thickness of the plate-shaped movable member. It is. Therefore, this mounting structure is suitable for a sewing machine in which other parts are located close to the presser bar and presser foot.

In the above configuration, the sewing machine includes an intermediate presser that presses the periphery of the sewing machine needle on the workpiece, and an outer presser that presses the outside of the intermediate presser, and the presser bar and the presser foot are connected to the intermediate presser. The movable member may constitute a presser foot, and the movable member may be disposed between the cylindrical portion and the outer presser foot.

A sewing machine that adopts this mounting structure has an intermediate presser foot and an outer presser foot that presses the outside of the intermediate presser in a direction intersecting the conveying direction of the workpiece. Specifically, the sewing machine needle, the intermediate presser foot, and the outer presser foot are arranged in close proximity to each other in the conveying direction. In other words, in a sewing machine with this configuration, the sewing machine needle and the outer presser foot are present on both sides of the intermediate presser in the conveying direction, so the space between them is narrow, and the mounting structure of the presser foot that constitutes the intermediate presser is A mounting structure having this configuration is particularly suitable.

In the above configuration, the movable member may be configured such that a portion on one end side protrudes outward from the outer presser in a direction intersecting a direction in which the intermediate presser and the outer presser are lined up.

In this mounting structure, one end of the movable member protrudes in the direction intersecting the direction in which the intermediate presser and the outer presser are lined up (the direction of conveyance of the workpiece), so the user cannot operate the movable member. It's getting easier. Therefore, with this mounting structure, even in a sewing machine in which the sewing machine needle and the outer presser foot are close to each other, the presser foot of the intermediate presser can be easily attached to and detached from the presser bar.

In the above configuration, the shaft portion has a cylindrical shape, and the cylindrical portion has a cylindrical shape,
The convex portion is configured such that its tip protrudes outward from the outer peripheral surface of the cylindrical portion when inserted into the guide groove,
The guide groove includes a circumferential groove portion formed at the innermost end side and extending in the circumferential direction on the outer peripheral surface of the cylindrical portion, and a circumferential groove portion extending in the vertical direction with one end opening in the one side and the other end opening in the circumferential direction. consisting of a vertical groove connected to the groove,
The movable member is configured such that a locking portion that locks the convex portion moves generally in a direction in which the vertical groove extends by its own movement, and the locking portion is at a position overlapping the outside of the vertical groove. It is operable between a first state and a second state in which the locking portion is removed from the longitudinal groove toward the other end,
The other has a biasing member that biases the movable member in a direction to move from the second state toward the first state,
When the presser foot is attached to the presser bar, as the protrusion enters the guide groove, the tip of the protrusion comes into contact with the locking part of the movable member, and When the stop portion is moved to the other end side of the longitudinal groove portion against the urging force of the urging member and the convex portion is inserted into the circumferential groove portion, the lock portion is moved against the urging force of the urging member. It can be configured to be moved to a position overlapping the outside of the longitudinal groove portion by a biasing force.

The mounting structure of this configuration embodies the above-described configuration in which the movable member is retracted from the first state to the second state as the convex portion is inserted into the guide groove. In this mounting structure, the presser foot is inserted upward into the presser bar with the protrusion and the vertical groove of the guide groove aligned, and the axis of the presser foot is aligned with the presser bar. Simply rotate the presser foot around to complete the attachment of the presser foot to the presser bar. Note that when removing the presser foot from the presser bar, the user operates the movable member from the first state to the second state, rotates the presser foot around the axis relative to the presser bar, and then Just pull it downwards. Therefore, with this mounting structure, the presser foot can be more easily attached to and detached from the presser bar.

According to the present invention, the presser foot mounting structure allows the presser foot to be easily attached and detached with a simple configuration, and also allows the presser foot to be reliably supported when the presser foot is attached to the presser bar. can be provided.

A perspective view of a sewing machine according to a first embodiment in which the mounting structure of the present invention is adopted Side view showing the sewing machine needle, intermediate presser foot, and outer presser foot shown in Figure 1 Exploded perspective view of the presser foot A perspective view from the front of an intermediate presser employing the mounting structure of the present invention Perspective view from the rear of the intermediate presser Rear view of intermediate presser foot A perspective view of the intermediate presser shown from the rear with the intermediate presser removed. Rear view of the intermediate presser with the intermediate presser removed Exploded perspective view of intermediate presser foot Rear view showing the intermediate presser foot with the lever member removed Perspective view of lever member This is a diagram for explaining the intermediate attachment work of the intermediate presser foot, and shows a state in which the positioning pin has started to be inserted into the guide groove. FIG. 3 is a diagram for explaining the attachment work of the intermediate presser foot, and is a diagram showing a state in which the lever member is in the second state. Diagram showing a state in which the installation of the intermediate presser foot is completed (the lever member is in the first state) FIG. 3 is a diagram for explaining the removal work of the intermediate presser foot, and is a diagram showing a state in which the lever member is in the second state by the user. Front view showing the sewing machine needle, intermediate presser foot, and outer presser foot shown in Figure 1 Rear view showing the mounting structure of the presser foot according to the second embodiment Rear view showing the mounting structure of the presser foot according to the third embodiment

<First embodiment>
i) Configuration of sewing machine A sewing machine 10 according to a first embodiment in which a presser foot mounting structure (hereinafter sometimes simply referred to as "mounting structure") of the present invention is adopted will be described with reference to FIGS. 1 to 16. do. The present sewing machine 10 includes a sewing machine main body 11, a sewing machine needle 12, an intermediate presser 13, and an outer presser 14, which are held in a state hanging from the sewing machine main body 11. As shown in FIG. 2, the sewing machine needle 12, the intermediate presser 13, and the outer presser 14 are arranged side by side in the direction in which the object to be sewn, such as cloth, is conveyed. In the following description, the side into which the workpiece is inserted is referred to as the front side (front side), and the side to which the workpiece is fed is referred to as the rear side (back side). In addition, in some of the drawings, the front and rear are indicated by arrows F and B, the upper and lower directions are indicated by arrows U and D, respectively, and the left and right sides in front view are indicated by arrows L and R. Each is shown below.

The intermediate presser foot 13 has an insertion hole 13A through which the sewing machine needle 12 can be inserted in the vertical direction, and is used to press the periphery of the sewing machine needle 12 when it is inserted into the workpiece. Further, the outer presser foot 14 is capable of pressing the outside of the intermediate presser 13 on the workpiece to feed the workpiece in the conveyance direction, more specifically, the outer presser foot 14 can press both sides of the intermediate presser foot 13 in a direction intersecting the conveyance direction. It is something. For both the intermediate presser foot 13 and the outer presser foot 14, multiple types of presser feet are prepared depending on the type of sewing process such as normal sewing or embroidery sewing, the type and thickness of the workpiece to be sewn, etc. The presser foot is said to be replaceable. That is, the intermediate presser foot 13 includes an intermediate presser bar 20 provided on the side of the sewing machine main body 11 and an intermediate presser foot 21 that is detachable from the intermediate presser bar 20, and the outer presser foot 14 includes: The sewing machine includes an outer presser foot 30 provided on the side of the sewing machine main body 11 and an outer presser foot 31 that is detachable from the outer presser foot 30. The attachment structure for the presser foot of the present invention is adopted for the intermediate presser foot 13, and is a structure for attaching the intermediate presser foot 21 to the intermediate presser bar 20.

ii) Structure of the outer presser foot Before explaining the intermediate presser foot 13 in which the mounting structure of the present invention is adopted, the structure of the outer presser foot 14 will first be briefly explained with reference to FIGS. 2 and 3. . As shown in FIG. 3, the outer presser foot 14 includes not only an outer presser foot 31 but also a guard member 32 for preventing the operator's fingers or the like from coming into contact with the sewing machine needle 12 with respect to the outer presser bar 30. It has a removable structure. First, the presser foot bar 30 is constructed in a manner that improves the conventional mounting structure in which the presser foot is fastened to the presser rod using screws 33. Therefore, the shaft body 34 of the presser bar 30 in the presser foot 14 is fixed to the sewing machine side shaft body 35 which functions as a presser bar in the conventional mounting structure, and the sewing machine side shaft body 35 is fixed to the lower end of the sewing machine side shaft body 35. and a stretching member 36 that extends downward. Note that the extension member 36 is fixed to the sewing machine side shaft body 35 using a screw 33 that is used for fastening a presser foot in a conventional mounting structure. Further, the external presser rod 30 includes a rotating body 37 and a locking member 38, which are two annular members that are inserted into the shaft body 34 so as to be rotatable around the axis and movable in the axial direction. be done. A radially extending flange portion 39 is formed at the lower end of the shaft body 34, more specifically, at the lower end of the extending member 36, and is capable of holding the rotating body 37 and the locking member 38. There is. Furthermore, a notch 36A is formed at the lower end of the extending member 36 to divide it into left and right halves.

On the other hand, the outer presser foot 31 has a lower end serving as a presser foot 40 that presses the object to be sewn, and an upper end that serves as a supported portion 41 that is supported by the outer presser foot 30 . As mentioned earlier, the outer presser foot can be replaced with a plurality of types having different body shapes, but in this embodiment, the presser foot 40 of the outer presser foot 31 has a width It is relatively small in size (in the left-right direction), and has a shape in which the tip side (front side) is split into two, with each tip curved upward. Note that, as shown in FIG. 1, the presser part of the intermediate presser foot 21 of the intermediate presser foot 13 is arranged inside the bifurcated portion of the presser part 40 of the outer presser foot 31.

Furthermore, the supported portions of the plurality of types of presser feet have the same shape. The supported portion 41 has a generally rectangular plate shape with plate surfaces on each of the left and right sides, and can be fitted into the notch 36A from the lower end of the external presser rod 30 described above. With such a configuration, the outer presser foot 31 engages with the outer presser rod 30 in a manner that prevents relative rotation. Further, in a state where the supported part 41 is fitted into the notch 36A, the upper end of the supported part 41 is a protruding part 41A that projects outward from the outer peripheral surface of the shaft body 34.

The rotating body 37 can pass through the protrusion 41A of the supported part 41 at a specific rotational position. In other words, the rotating body 37 can pass through the protruding part 41A of the supported part 41. , can be located below the protrusion 41A. When the rotating body 37 is rotated at that position, the protrusion 41A comes into contact with the upper surface of the rotating body 37, and the presser foot 31 is supported by the presser foot 30. In other words, the outer presser foot 31 is attached to the outer presser bar 30, but in this state, the rotating body 37 exists under the protrusion 41A, so the outer presser foot 30 reliably supports the outer presser foot 31. can do. Note that, as shown in FIG. 2, the locking member 37 engages with both the rotating body 37 and the protruding portion 41A of the outer presser foot 31 when the rotating body 37 supports the outer presser foot 31. As a result, rotation of the rotating body 37 is prohibited, and the outer presser foot 31 can be locked in a state attached to the outer presser bar 30. Incidentally, the guard member 32 has a recess 39A formed in the flange portion 39 of the shaft body 34, and is configured to be held between the flange portion 39 and the rotating body 37 using the recess 39A. .

iii) Structure of intermediate presser Next, the intermediate presser 13 in which the mounting structure of the present invention is adopted will be described in detail. As described above, the intermediate presser foot 13 is configured such that the intermediate presser foot 21 can be attached to and detached from the intermediate presser bar 20. The intermediate presser bar 20 has a shaft portion 50 that extends in the vertical direction, and a positioning pin 51 as a convex portion that projects radially outward from the outer peripheral surface of the shaft portion 50. The shaft portion 50 has a small diameter portion 50B whose outer diameter is slightly smaller than the upper portion 50A on the lower end side, and the positioning pin 51 protrudes forward in the middle of the small diameter portion 50B in the vertical direction. It is formed by

On the other hand, as shown in FIG. 9, the intermediate presser foot 21 includes a main body member 60 that is the main body of the presser foot, a lever member 61 as a movable member that is rotatably held with respect to the main body member 60, and a main body. It is configured to include a torsion spring 62 as a biasing member disposed between a member 60 and a lever member 61. Note that the intermediate presser foot 13 is constructed in a manner that improves the conventional mounting structure. In the conventional mounting structure adopted for the intermediate presser, the shaft portion 50 (more specifically, the small diameter portion 50B) of the intermediate presser rod 20 is inserted into the cylindrical portion in which a slit extending in the axial direction is formed, and the cylindrical portion is inserted into the cylindrical portion. By reducing the diameter and fixing it, the intermediate presser foot was attached to the intermediate presser rod. Therefore, as shown in FIGS. 9 and 10, the main body member 60 includes a cylindrical portion (cylindrical portion) 65 in which a slit 65A extending in the axial direction (vertical direction) is formed, and a cylindrical portion 65 on both sides of the slit 65A in the cylindrical portion 65. A pair of protruding parts 66 and 67 protrude outward from the portion (direction perpendicular to the conveying direction, specifically, the right side, left side in FIG. It consists of a presser part 68 for pressing a generally L-shaped workpiece. In other words, to explain the conventional mounting structure in detail, in the conventional mounting structure, the pair of overhanging parts 66 and 67 are tightened with screws, and the interval between the pair of overhanging parts 66 and 67 is narrowed to compress the cylindrical part 65. The structure was such that the intermediate presser foot was attached to the intermediate presser bar by making the diameter of the intermediate presser rod. In the following description, when the intermediate presser foot 21 is attached to the intermediate presser bar 20, the one located relatively on the front side of the pair of overhangs 66 and 67 will be referred to as the front side overhang 66. Those located on the rear side may be referred to as rear side projecting portions 67, respectively.

In this embodiment, the intermediate presser foot 21 does not have a structure that reduces the diameter of the cylindrical portion 65, but inserts the small diameter portion 50B of the intermediate presser rod 20 into the cylindrical portion 65, and inserts the positioning pin 51 of the intermediate presser rod 20 into the cylindrical portion 65. By inserting it into a guide groove 69 formed on the outer peripheral surface of the cylindrical portion 65, it can be inserted into and removed from the intermediate presser rod 20. The guide groove 69 is formed to penetrate the cylindrical portion 65 in the thickness direction, generally extends in the axial direction, and has a slit shape with one end opening upward (on the intermediate presser rod 20 side). Specifically, the guide groove 69 includes a vertical groove portion 70 extending downward from the opening 69A along the axis, and a circumferential groove portion 71 extending from the lower end of the vertical groove portion 70 in the circumferential direction of the cylindrical portion 65. As shown in FIG. 10, the vertical groove portion 70 is formed at a position shifted to the left side (right side in FIG. 10) from the rear of the axis of the cylindrical portion 65, and the circumferential groove portion 71 is formed to the right from the lower end of the vertical groove portion 70. (leftward in FIG. 10). The right end of the circumferential groove portion 71, that is, the innermost end 69B of the guide groove 69 is located at the rear of the cylindrical portion 65 when the positioning pin 51 is in contact with the inner peripheral surface. It is formed like this. Incidentally, when the positioning pin 51 is inserted into the guide groove 69, the positioning pin 51 has a height such that it projects outward from the guide groove 69, in other words, beyond the outer peripheral surface of the cylindrical portion 65. It has become a thing.

Further, in this embodiment, the lever member 61 is assembled to the intermediate presser foot 21 by utilizing the shape of the main body member 60. Specifically, although fastening holes for fastening screws were formed in the pair of projecting parts 66 and 67 of the main body member 60, through holes 66A and 67A are formed in these parts. That is, the through holes 66A and 67A penetrate in directions opposite to each other, in other words, in the front-rear direction (conveyance direction). Then, the shaft member 80 is inserted from the front side overhang part 66 side by passing through the through holes 66A, 67A of the pair of overhang parts 66, 67, and the tip of the shaft member 80 is placed on the rear side overhang part 67 side. It is fitted into the fitting part 81 (see FIG. 11) of the lever member 61 arranged at the. With such a configuration, the lever member 61 is rotatable about the shaft member 80 as a rotation axis.

The lever member 61 is a plate-shaped member, as shown in FIG. As shown in FIGS. 4 to 6, when the lever member 61 is assembled to the main body member 60, the lever member 61 is held with its plate surface expanding vertically and horizontally. That is, the above-mentioned fitting portion 81 is provided in a shape that projects forward from the front plate surface 61A of the lever member 61. Further, as shown in FIGS. 6 and 9, when the lever member 61 is assembled to the main body member 60, the left side (right side in FIG. 6) has a shape in which the height becomes smaller toward the left end, and A recess 82 recessed downward is formed near the left end. The recess 82 has a width slightly larger than the outer diameter of the positioning pin 51 of the intermediate presser bar 20, and has an arcuate lower edge. In other words, the lever member 61 can be considered to have a hook shape with the left end side having the protrusion 83 extending upward. In the following description, a portion of the lever member 61 to the left of the shaft member 80 will be referred to as an actuating portion 61B, and a portion to the right of the shaft member 80 will be referred to as an operating portion 61C.

A torsion spring 62 is disposed between the lever member 61 and the main body member 60. Specifically, as shown in FIG. 10, on the rear-facing surface of the rear overhang 67 of the main body member 60, a spring attachment is provided in which one end of the torsion spring 62 is fitted, with the through hole 67A widened. A groove 85 is formed. The spring mounting groove 85 includes a circular groove portion 85A that is larger than the inner diameter of the through hole 67A and into which the coil portion 62A of the torsion spring 62 is fitted, and an extension groove portion 85B into which the upwardly extending end 62B of the torsion spring 62 is fitted. , consists of. On the other hand, as shown in FIG. 11, the lever member 61 has a spring mounting groove 86 formed around the fitting portion 81 on the front surface 61A, into which the other end of the torsion spring 62 is fitted. The spring mounting groove 86 includes a circular groove portion 86A into which the coil portion 62A of the torsion spring 62 is fitted, and an extension groove portion 86B into which the other end 62C extending downwardly of the torsion spring 62 is fitted.

By fitting the torsion spring 62 into the spring mounting groove 85 of the main body member 60 and the spring mounting groove 86 of the lever member 61, the lever member 61 is brought into the state shown in FIG. ). The lever member 61 is biased by the torsion spring 62 in the direction of rotation counterclockwise (in the direction of the white arrow in FIG. 10, counterclockwise) when viewed from the rear. In this state, the tip of the actuating portion 61B of the lever member 61, more specifically, the upper end of the protruding portion 83, is located at the middle of the vertical groove portion 70 of the guide groove 69 on the outside (backward) in the vertical direction. become. The user can move the lever member 61 clockwise (rightward in FIG. 10) against the biasing force of the torsion spring 62 by lifting the operating portion 61C of the lever member 61 upward. rotation) to move the protrusion 83 downward (see FIG. 15). Further, when the user releases the lever member 61, the lever member 61 is returned to the state shown in FIG. 10 by the biasing force of the torsion spring 62.

iv) Attachment/detaching operation of intermediate presser foot Next, attachment/detachment operation of the intermediate presser foot 21 to/from the intermediate presser bar 20 will be described in detail with reference to FIGS. 8, 12 to 14. In this sewing machine 10, the intermediate presser foot 21 and the outer presser foot 31 basically form a pair, and both the intermediate presser foot 21 and the outer presser foot 31 must be replaced at the same time. . Therefore, when attaching them, after attaching the outer presser foot 31, the work of attaching the intermediate presser foot 21 is performed. Conversely, when removing both, the work of removing the outer presser foot 31 is performed after removing the intermediate presser foot 21. In other words, the work of attaching and detaching the outer presser foot 31 is performed with the intermediate presser foot 21 not attached, so there is relatively sufficient space. As shown in FIGS. 1 and 2, the work space is limited.

First, when attaching the intermediate presser foot 21 to the intermediate presser bar 20, as shown in FIG. 8, the guide groove 69 of the intermediate presser foot 21 is aligned with the positioning pin 51 of the intermediate presser bar 20. Then, the intermediate presser foot 21 is raised, the small diameter portion 50B of the intermediate presser bar 20 is inserted into the cylindrical portion 65, and the positioning pin 51 is inserted into the vertical groove portion 70 of the guide groove 69. When the positioning pin 51 is inserted into the vertical groove 70 of the guide groove 69, the positioning pin 51 comes into contact with the protrusion 83 of the lever member 61, as shown in FIG. Furthermore, when the intermediate presser foot 21 is raised, the positioning pin 51 pushes the protrusion 83 downward with respect to the main body member 60, that is, the lever member 61 is pushed against the biasing force of the torsion spring 62 (as shown in FIG. (in the direction of the white arrow shown).

As shown in FIG. 13, when the positioning pin 51 reaches the lower end of the vertical groove portion 70, the protrusion portion 83 is moved to a position downwardly removed from the guide groove 69. In this state, the lever member 61 is biased by the torsion spring 62 in the direction of returning to the state shown in FIG. 12 (in the direction of the white arrow shown in FIG. 13), in other words, the protrusion 83 is raised. A biasing force in the direction is acting. Next, the intermediate presser foot 21 is rotated relative to the intermediate presser bar 20 (in the direction of the black arrow shown in FIG. 13), and the positioning pin 51 is inserted into the circumferential groove 71.

When the positioning pin 51 reaches the innermost end 69B of the guide groove 69, the positioning pin 51 comes off from above the protrusion 83 of the lever member 61. As explained above, a biasing force in the direction of raising the protruding part 83 acts on the lever member 61, and when the positioning pin 51 is removed from above the protruding part 83, the protruding part 83 is raised by the biasing force. The lever member 61 rotates as shown in FIG. 14, and the positioning pin 51 fits into the recess 82 of the lever member 61 as shown in FIG. In this state, the positioning pin 51 is sandwiched between the inner peripheral surface of the guide groove 69 and the inner peripheral surface of the recess 82 of the lever member 61, and the positioning pin 51 has a protrusion on the opening 69A side of the guide groove 69. 83 is in contact. Therefore, the movement of the positioning pin 51 in the direction of exiting the guide groove 69, that is, the rotation of the intermediate presser foot 21 with respect to the intermediate presser bar 20 is restricted. Therefore, the intermediate presser foot 21 is attached to the intermediate presser bar 20.

Next, the operation of removing the intermediate presser foot 21 from the intermediate presser bar 20 will be explained. First, when removing the intermediate presser foot 21 from the intermediate presser bar 20, as shown in FIG. 15, the user raises the operating portion 61C of the lever member 61 and moves the protruding portion 83 downward. Thereby, the locking of the positioning pin 51 by the protruding portion 83 of the lever member 61 is released. Then, the user rotates the intermediate presser foot 21 with respect to the intermediate presser bar 20, aligns the positioning pin 51 with the vertical groove portion 70 of the guide groove 69, and pulls the intermediate presser foot 21 downward from the intermediate presser bar 20. This allows the intermediate presser foot 21 to be removed from the intermediate presser bar 20.

v) Effects of the present mounting structure As described above, in the mounting structure according to the present embodiment, the intermediate presser bar (one of the presser bar and the presser foot) 20 has a shaft portion 50 extending in the vertical direction, and a shaft portion 50 extending in the vertical direction. It has a positioning pin (protrusion) 51 that protrudes outward from the outer peripheral surface. The intermediate presser foot (the other of the presser foot and the presser foot) 21 includes a cylindrical portion (cylindrical portion) 65 that opens toward the intermediate presser rod 20 side in the vertical direction, and a cylindrical portion 65 that is formed on the outer circumferential surface of the cylindrical portion 65 in the vertical direction. A guide groove 69 opening toward the intermediate presser bar 20 side, and a lever member (movable member) 61 disposed outside the cylindrical portion 65 and movable between the first state and the second state. By inserting the shaft portion 50 into the cylindrical portion 65 and inserting the positioning pin 51 into the guide groove 69, the intermediate presser rod 20 can be inserted and removed. In the mounting structure according to the present embodiment, the lever member 61 is in the first state (the state shown in FIG. 14) with the positioning pin 51 inserted into the innermost end 69B of the guide groove 69. The member 61 locks the positioning pin 51 to restrain movement of the positioning pin 51 in the guide groove 69, the intermediate presser foot 21 is attached to the intermediate presser bar 20, and the lever member 61 is in the second state ( 15), the locking of the positioning pin 51 by the lever member 61 is released, the positioning pin 51 is allowed to move along the guide groove 69, and the intermediate presser foot 21 is moved to the intermediate presser bar 20. It is said that it can be attached and detached from the

The sewing machine 10 of this embodiment, which employs the presser foot mounting structure having this configuration, can be operated by simply inserting the intermediate presser foot 21 into the intermediate presser bar 20 and operating the lever member 61 from the second state to the first state. The presser foot 21 can be attached to the intermediate presser bar 20, and the intermediate presser can be attached by simply moving the lever member 61 from the first state to the second state and pulling out the intermediate presser foot 21 from the intermediate presser bar 20. The metal 21 can be removed from the intermediate presser bar 20. In other words, with this attachment structure, the intermediate presser foot 21 can be easily attached to and detached from the intermediate presser bar 20. Further, in this mounting structure, when the intermediate presser foot 21 is attached to the intermediate presser bar 20, the positioning pin 51 can be moved in either direction by the inner peripheral surface of the innermost end 69B of the guide groove 69 and the lever member 61. Since movement to is also restricted, it is possible to avoid a situation in which the intermediate presser foot 21 falls off from the intermediate presser bar 20, and it is possible to reliably support the intermediate presser foot 21 with respect to the intermediate presser bar 20.

In addition, in the mounting structure according to the present embodiment, the shaft portion 50 has a cylindrical shape, and the cylindrical portion 65 has a cylindrical shape, and the guide groove 69 has the innermost end 69B side at the outer periphery of the cylindrical portion 65. A circumferential groove portion 71 extends in the circumferential direction on the surface, and the lever member 61 is configured to restrict movement of the positioning pin 51 in the circumferential direction in the first state. With this configuration, in this mounting structure, the positioning pin 51 is inserted into the innermost part of the circumferential groove 71, so that the positioning pin 51 is restrained from moving in the vertical direction, and the intermediate presser foot 21 is moved relative to the intermediate presser bar 20. movement in the axial direction (vertical direction) is prohibited. In other words, a situation in which the intermediate presser foot 21 falls off from the intermediate presser bar 20 can be avoided. In addition, the lever member 61 restricts the movement of the positioning pin 51 within the circumferential groove portion 71, so that the relative rotation between the shaft portion 50 and the cylindrical portion 65, that is, the rotation of the intermediate presser foot 21 around the axis with respect to the intermediate presser rod 20, is controlled. Rotation can be restricted. Therefore, according to this mounting structure, the intermediate presser foot 21 can be more reliably supported with respect to the intermediate presser bar 20. Furthermore, in this mounting structure, by inserting the positioning pin 51 into the innermost part of the guide groove 69, the rotational position of the intermediate presser foot 21 with respect to the intermediate presser bar 20 is determined, and the sewing machine needle 12 and the outer presser foot 31 are The relative position of the intermediate presser foot 21 is also determined. Therefore, unlike the conventional mounting structure, there is no need to adjust the position of the intermediate presser foot 21 in the rotational direction with respect to the sewing machine needle 12 and the outer presser foot 14, making it easier to replace the presser feet 21 and 31. At the same time, the time required for replacement work can be shortened.

Furthermore, in the mounting structure according to the present embodiment, the intermediate presser foot 21 includes a torsion spring (biasing member) 62 that biases the lever member 61 from the second state toward the first state. According to this configuration, since the lever member 61 can be maintained in the first state by the biasing force of the torsion spring 62, the positioning pin 51 can be reliably locked by the lever member 61, and the intermediate presser foot 21 can be reliably locked. can be more reliably supported by the intermediate presser bar 20.

Further, in the mounting structure according to the present embodiment, when the intermediate presser foot 21 is attached to the intermediate presser bar 20, as the positioning pin 51 enters the guide groove 69, the positioning pin 51 is attached to the lever member 61. , the lever member 61 is moved from the first state to the second state against the urging force of the torsion spring 62, and when the positioning pin 51 reaches the innermost end 69B of the guide groove 69, the lever member 61 is moved. It is configured to move from the second state to the first state by the biasing force of the torsion spring 62. With this structure, when attaching the intermediate presser foot 21 to the intermediate presser bar 20, the positioning pin 51 is aligned with the guide groove 69, and the intermediate presser foot 21 is raised relative to the intermediate presser bar 20. By simply retracting the lever member 61 from the first state to the second state, and inserting the positioning pin 51 to the innermost part of the guide groove 69, the locking of the positioning pin 51 by the lever member 61 is completed. . According to this mounting structure, as shown in FIG. 14, since the positioning pin 51 is held between the inner circumferential surface of the circumferential groove 71 by the lever member 61 that is biased upward, Shaking within the circumferential groove portion 71 can also be suppressed. Further, since the positioning pin 51 fits into the recess 82, movement in the circumferential direction relative to the lever member 61 is restricted, and rattling of the intermediate presser foot 21 in the rotational direction relative to the intermediate presser bar 20 can also be suppressed. can. As described above, according to the present attachment structure, the intermediate presser foot 21 can be easily attached to the intermediate presser bar 20, and can be reliably supported while suppressing rattling.

To put the above configuration more specifically, in the mounting structure according to the present embodiment, the guide groove 69 extends in the vertical direction with the circumferential groove portion 71, and has one end open to the intermediate presser bar 20 side and the other end. The lever member 61 has a longitudinal groove portion 70 connected to the circumferential groove portion 71, and the lever member 61 has a protruding portion 83 that functions as a locking portion that locks the positioning pin 51 by its own operation. It is configured to move in the extending direction, and has a first state in which the protruding portion 83 is in a position overlapping the outside of the vertical groove portion 70, and a second state in which the protruding portion 83 is in a position downward from the vertical groove portion 70. It is said to be possible to operate between. In this mounting structure, when the intermediate presser foot 21 is attached to the intermediate presser bar 20, as the positioning pin 51 enters the guide groove 69, the positioning pin 51 is attached to the protrusion 83 of the lever member 61. When the positioning pin 51 is inserted into the circumferential groove 71, the protrusion 83 moves downward against the biasing force of the torsion spring 62, and when the positioning pin 51 is inserted into the circumferential groove 71, the protrusion 83 It is configured to move to a position overlapping the outside of the vertical groove portion 70 by force. Therefore, as described above, in this mounting structure, the intermediate presser foot 21 is raised relative to the intermediate presser bar 20 while the positioning pin 51 and the vertical groove portion 70 of the guide groove 69 are aligned. By simply inserting the intermediate presser bar 20 into the intermediate presser foot 21 and rotating the intermediate presser foot 21 around the axis relative to the intermediate presser bar 20, the attachment of the intermediate presser foot 21 to the intermediate presser bar 20 is completed. It has become. In addition, when removing the intermediate presser foot 21 from the intermediate presser bar 20, the lever member 61 is moved from the first state to the second state by the user's operation, and the intermediate presser foot 21 is moved against the intermediate presser bar 20. Simply rotate it around its axis, then pull it downwards. Therefore, according to this mounting structure, the intermediate presser foot 21 can be easily attached to and detached from the intermediate presser bar 20.

Furthermore, in the mounting structure according to the present embodiment, as shown in FIG. The lever member 61 is a plate-shaped member that extends on a plane that is parallel to the axis of the cylindrical part 65 and intersects the tip of the positioning pin 51, and is disposed on the cylindrical part 65 so as to be movable on the plane. There is. With this configuration, in this mounting structure, even if the lever member 61 is disposed outside the cylindrical portion 65, as shown in FIG. The thickness is only 61 mm. Therefore, in this mounting structure, although the outer presser foot 14 is located close to the intermediate presser foot 13, it is possible to arrange the lever member 61 on the outer presser foot 14 side of the main body member 60 (cylindrical portion 65). -ing

In addition, in the mounting structure according to the present embodiment, as shown in FIG. It is held in a state where it protrudes further to the right. With this configuration, even if the sewing machine 10 of the present embodiment has a configuration in which the intermediate presser 13 employing this attachment structure is close to the outer presser 14, the operating portion 61C of the lever member 61 protrudes outward. It is easy for the user to operate the lever member 61, and it is easy to attach and detach the intermediate presser foot 21 from the intermediate presser bar 20 in the intermediate presser foot 13 (in this embodiment, there is no need to operate the lever member 61 during attachment). can be done.

<Second embodiment>
In the mounting structure according to the first embodiment, the guide groove 69 was composed of the circumferential groove part 71 and the vertical groove part 70, but the shape of the guide groove is not limited thereto. The sewing machine of the second embodiment has almost the same configuration as the sewing machine 10 of the first embodiment, and only the shape of the intermediate presser foot 101 of the intermediate presser foot 100 is different from the intermediate presser foot 21 of the sewing machine 10 of the first embodiment. differ. Therefore, the same components as those of the sewing machine 10 of the first embodiment are given the same reference numerals, and the explanation thereof will be omitted. Regarding the sewing machine of the second embodiment, only the mounting structure of the intermediate presser foot 101 to the intermediate presser bar 20, which is the mounting structure of the present invention, is shown in FIG. 17, and will be described with reference to FIG.

The intermediate presser foot 100 according to the second embodiment is configured such that the intermediate presser foot 101 can be attached to and detached from the intermediate presser bar 20 according to the first embodiment. Like the intermediate presser foot 21 according to the first embodiment, the intermediate presser foot 101 includes a main body member 110 that is the main body of the presser foot, and a lever that is a movable member that is rotatably held with respect to the main body member 110. It is configured to include a member 111 and a torsion spring 112 as a biasing member disposed between the main body member 110 and the lever member 111. Further, like the main body member 60 according to the first embodiment, the main body member 110 includes a cylindrical portion (cylindrical portion) 115 in which a slit extending in the axial direction (vertical direction) is formed, and both sides of the slit in the cylindrical portion 115. A pair of projecting portions 116 projecting outward from the side portions (direction perpendicular to the conveying direction, left side in FIG. 17), and a sewing material extending from the lower end of the cylindrical portion 115 and having a generally L-shape when viewed from the side. It consists of a presser part 117 for holding an object.

Further, although the guide groove 118 is formed in the cylindrical portion 115 of the main body member 110, its shape is different from the bent shape like the guide groove 69 according to the first embodiment, and is a curved shape. ing. More specifically, the guide groove 118 has a downwardly convex curve, and the innermost end 118A of the guide groove 118 is shaped to face approximately in the circumferential direction. Note that the innermost end 118A of the guide groove 118 is at the same position as the innermost end 69B of the guide groove 69 according to the first embodiment. That is, when the positioning pin 51 of the intermediate presser bar 20 is inserted to the innermost part of the guide groove 118, the rotational position of the intermediate presser foot 101 with respect to the intermediate presser bar 20 is determined.

Due to such a configuration, in this embodiment, when attaching the intermediate presser foot 101 to the intermediate presser bar 20, the intermediate presser foot 101 is rotated around the axis of the cylindrical portion 115 with respect to the intermediate presser bar 20. By simultaneously raising the positioning pin 51, the positioning pin 51 can be inserted to the innermost part of the guide groove 118.

Note that, like the lever member 61 according to the first embodiment, the lever member 111 according to the present embodiment is rotatably held on the outside of the main body member 110, and is rotated counterclockwise in rear view by the torsion spring 112. In other words, the actuating portion 120 (the left side portion of the lever member 111, the right side portion in FIG. 17) is biased in the direction of being raised. Further, although the lever member 111 has a slightly different shape from the lever member 61 according to the first embodiment, similarly to the lever member 61, when the lever member 111 is held by the main body member 110, the actuating portion 120 is disposed at the tip (FIG. 17). The height becomes smaller toward the right end (in the right side), and a recess 121 that is recessed downward is formed near the tip. From such a shape, it can be considered that a protrusion 122 that protrudes upward is formed at the tip of the actuating portion 120.

Before the intermediate presser foot 101 is attached to the intermediate presser bar 20, the protruding portion 122 of the actuating portion 120 of the lever member 111 is located at a position overlapping the outside of the guide groove 118. When the intermediate presser foot 101 is attached to the intermediate presser bar 20, as the positioning pin 51 enters the guide groove 118, the positioning pin 51 comes into contact with the protrusion 122 of the lever member 111, and the lever member 111 is rotated against the biasing force of the torsion spring 112, and the protrusion 122 is moved to a position below the guide groove 118 (second state). Furthermore, when the positioning pin 51 enters the guide groove 118 and reaches the innermost end 118A of the guide groove 118, the lever member 111 is rotated by the biasing force of the torsion spring 112, and the lever member 111 is rotated to the state shown in FIG. ). In this state, the positioning pin 51 is in contact with the protrusion 122 of the lever member 111 on the opening side of the guide groove 118, and movement of the positioning pin 51 toward the opening side of the guide groove 118 is prohibited. Further, when removing the intermediate presser foot 101 from the intermediate presser bar 20, the intermediate presser foot 101 is moved against the intermediate presser bar 20 while the lever member 111 is moved from the first state to the second state by the user's operation. Simply rotate it around the axis and pull it out downwards.

As described above, in the mounting structure according to the present embodiment, the intermediate presser foot 101 can be easily attached to and detached from the intermediate presser bar 20, similarly to the attachment structure according to the first embodiment. .

<Third embodiment>
In the mounting structure according to the above two embodiments, the intermediate presser bar 20 includes a shaft portion 50 extending in the vertical direction and a positioning pin (convex portion) 51 that projects outward from the outer peripheral surface of the shaft portion 50. The intermediate presser foot 21, 101 has a cylindrical portion (cylindrical portion) 65, 115 that opens toward the intermediate presser bar 20 side in the vertical direction, and a cylindrical portion (cylindrical portion) 65, 115 that is formed on the outer peripheral surface of the cylindrical portion 65, 115 and Guide grooves 69, 118 open to the intermediate presser bar 20 side, and a lever member (movable member) 61 disposed on the outside of the cylindrical portions 65, 115 so as to be movable between the first state and the second state. , 111. On the other hand, the mounting structure according to the third embodiment is applied to the intermediate presser foot 150 similarly to the mounting structure according to the above two embodiments, but as shown in FIG. 18, the mounting structure is upside down. In other words, the structure of the attachment part of the intermediate presser bar 151 and the structure of the attachment part of the intermediate presser foot 152 are the same as the structure of the attachment part of the intermediate presser bar in the attachment structures according to the above two embodiments. The structure is similar to that of the presser foot attachment part.

Specifically, first, the intermediate presser foot (one of the presser bar and the presser foot) 152 includes a shaft portion 160 that extends in the vertical direction, and a positioning pin (convex) that protrudes outward from the outer peripheral surface of the shaft portion 160. part) 161. Further, an intermediate presser bar (the other of the presser bar and the presser foot) 151 is formed on a cylindrical portion (cylindrical portion) 165 that opens toward the intermediate presser foot 152 side (lower side) in the vertical direction, and on the outer peripheral surface of the cylindrical portion 165. a guide groove 166 that opens toward the intermediate presser foot 152 in the vertical direction, and a lever member (movable member) that is disposed outside the cylindrical portion 165 and is movable between a first state and a second state. 167. Note that the lever member 167 is biased clockwise in FIG. 18 by a biasing member, and a protrusion 168A formed on the distal end side of the actuating portion 168 is biased downward.

Therefore, in the mounting structure according to the third embodiment, when the positioning pin 161 of the intermediate presser foot 152 is aligned with the rotational position of the vertical groove portion 166A of the guide groove 166 of the intermediate presser bar 151, and the intermediate presser foot 152 is raised, The protruding portion 168A of the lever member 167 can be brought into contact with the protruding portion 168A, and the protruding portion 168A can be retracted to the upper side of the guide groove 166. Then, by rotating the intermediate presser foot 152 with respect to the intermediate presser bar 151 and inserting the positioning pin 161 into the circumferential groove portion 166B of the guide groove 166, the protruding portion 168A of the lever member 167 is It is moved downward by the force and can lock the positioning pin 161. As described above, in the mounting structure according to the third embodiment, the intermediate presser foot 152 is raised relative to the intermediate presser bar 151, and the intermediate presser foot 152 is moved to the intermediate presser bar, similarly to the mounting structure according to the first embodiment. 151 and rotate the intermediate presser foot 152 around the axis relative to the intermediate presser rod 151, attachment of the intermediate presser foot 152 to the intermediate presser rod 151 is completed. In addition, when removing the intermediate presser foot 152 from the intermediate presser bar 151, the user moves the operating portion 169 of the lever member 167 downward to retract the protruding portion 168A upward from the guide groove 166, and then presses the intermediate presser Simply rotate the metal 152 relative to the intermediate presser bar 151, and then pull out the intermediate presser foot 152 downward.

As described above, the mounting structure according to the third embodiment, like the mounting structures according to the above two embodiments, allows the intermediate presser foot 152 to be easily attached and detached from the intermediate presser bar 151. There is. Note that the mounting structures according to the above two embodiments were configured as improvements to the conventional mounting structures, so it was necessary to attach movable members to multiple types of presser feet. In such a mounting structure, the lever member 167 is provided on the intermediate presser bar 151, and the shape of the presser foot becomes simple, so that the manufacturing time and cost of the presser foot can be reduced.

<Other embodiments>
The present invention is not limited to the above three embodiments, but can be implemented in various forms with various changes and improvements based on the knowledge of those skilled in the art. For example, the following embodiments are also included within the technical scope of the present invention.

(1) In the three embodiments described above, the structure is such that the cylindrical shaft portion is inserted into the cylindrical tube portion, but the present invention is not limited thereto. For example, the shaft portion and the cylindrical portion may have polygonal cross-sections and may be configured to fit together so that they cannot rotate relative to each other. In the case of this configuration, the guide groove is linear, but it is sufficient that the movable member restricts the movement of the convex portion toward the opening side of the guide groove.

(2) In the three embodiments described above, the movable member was rotatably provided with respect to the main body member (cylindrical portion), but the movable member is not limited thereto. For example, the movable member may be provided so as to be linearly movable between a first position (first state) and a second position (second state). When the guide groove is linear as described above, this movable member is movable in a direction perpendicular to the guide groove, and is in contact with the opening side of the guide groove of the convex portion in the first position. With this configuration, movement of the convex portion toward the opening side can be reliably restrained.

(3) In the above three embodiments, the tip of the protrusion protrudes outward from the outer peripheral surface of the cylindrical portion, and the movable member moves within the guide groove of the protrusion by abutting the tip of the protrusion. It was supposed to be binding, but it is not limited to that. For example, in the first state, the movable member may be configured to enter into the guide groove and come into contact with the convex portion, thereby restraining the movement of the convex portion within the guide groove.

(4) In the above three embodiments, the movable member is provided with a biasing member that biases the movable member from the second state toward the first state, but the movable member is not provided with a biasing member and is not used. The configuration may be such that the second state can be switched to the first state by an operator's operation.

(5) The mounting structures according to the three embodiments described above have been adopted as the mounting structure of the intermediate presser foot in the intermediate presser in sewing machines equipped with the outer presser foot and the intermediate presser foot. It can also be adopted. Further, if the sewing machine is equipped with a single presser foot, the present invention can also be adopted as a presser foot mounting structure for the single presser foot.

10... Sewing machine, 11... Sewing machine body, 12... Sewing machine needle, 13... Intermediate presser foot, 14... Outer presser foot, 20... Intermediate presser bar [presser bar], 21... Intermediate presser foot [presser foot], 50... Shaft portion, 51 ...Positioning pin [convex part], 60...Body member, 61...Lever member [movable member], 62...Torsion spring [biasing member], 65...Cylindrical part [cylindrical part], 69...Guide groove, 69A...Opening, 69B... Innermost end, 70... Vertical groove, 71... Circumferential groove, 83... Projection [locking part], 100... Intermediate presser foot, 101... Intermediate presser foot [presser foot], 110... Main body member, 111... Lever Member [movable member], 112... Torsion spring [biasing member], 115... Cylindrical part [cylindrical part], 118... Guide groove, 118A... Innermost end, 122... Projection part [locking part], 150... Intermediate presser , 151... Intermediate presser bar [presser bar], 152... Intermediate presser foot [presser foot], 160... Shaft part, 161... Positioning pin [convex part], 165... Cylindrical part [cylindrical part], 166... Guide groove, 166A ...Vertical groove part, 166B...Circumferential groove part, 167...Lever member [movable member], 168A...Protrusion part [locking part]

Claims (6)

A presser foot mounting structure for a sewing machine in which the presser foot is removably attached to a presser bar,
One of the presser bar and the presser foot has a shaft portion extending in the vertical direction, and a convex portion protruding outward from the outer peripheral surface of the shaft portion,
The other of the presser bar and the presser foot includes a cylindrical portion opening on the one side in the vertical direction, a guide groove formed on the outer peripheral surface of the cylindrical portion and opening on the one side in the vertical direction, and the cylinder. a movable member disposed on the outside of the part so as to be movable between a first state and a second state; By inserting the part, it is possible to insert and remove the one,
By bringing the movable member into the first state with the convex portion inserted into the innermost end of the guide groove, the movable member locks the convex portion and the guide groove of the convex portion the presser foot is attached to the presser bar;
By bringing the movable member into the second state, the convex portion is unlocked by the movable member, allowing the convex portion to move along the guide groove, and the presser foot is moved to the presser bar. It is said to be detachable from the
The convex portion is configured such that its tip protrudes outward from the outer peripheral surface of the cylindrical portion when inserted into the guide groove,
The movable member is a plate-shaped member that extends on a plane that is parallel to the axis of the cylindrical portion and intersects the tip of the convex portion, and is disposed on the cylindrical portion so as to be movable on the plane;
The sewing machine includes an intermediate presser that presses the periphery of the sewing machine needle on the workpiece, and an outer presser that presses the outside of the intermediate presser,
The presser foot and the presser foot constitute the intermediate presser foot,
The movable member is a mounting structure for a presser foot disposed between the cylindrical portion and the outer presser foot . 2. The presser foot mounting structure according to claim 1 , wherein the movable member has a portion on one end side protruding outward from the outer presser in a direction intersecting a direction in which the intermediate presser and the outer presser are lined up. The shaft portion has a cylindrical shape, and the cylindrical portion has a cylindrical shape,
The innermost end of the guide groove is a circumferential groove extending in the circumferential direction on the outer circumferential surface of the cylindrical portion,
3. The presser foot mounting structure according to claim 1, wherein the movable member is configured to restrict movement of the convex portion in the circumferential direction in the first state. The presser foot according to any one of claims 1 to 3, wherein the other member includes a biasing member that biases the movable member in a direction to move from the second state toward the first state. Mounting structure. When the presser foot is attached to the presser bar, as the protrusion enters the guide groove, the protrusion comes into contact with the movable member, causing the movable member to move toward the biasing member. When the movable member is moved from the first state to the second state against the biasing force and the convex portion reaches the innermost end of the guide groove, the movable member is moved to the second state by the biasing force of the biasing member. The presser foot mounting structure according to claim 4, wherein the presser foot mounting structure is configured to operate from the first state to the first state. The shaft portion has a cylindrical shape, and the cylindrical portion has a cylindrical shape,
The convex portion is configured such that its tip protrudes outward from the outer peripheral surface of the cylindrical portion when inserted into the guide groove,
The guide groove includes a circumferential groove portion formed at the innermost end side and extending in the circumferential direction on the outer peripheral surface of the cylindrical portion, and a circumferential groove portion extending in the vertical direction with one end opening in the one side and the other end opening in the circumferential direction. consisting of a vertical groove connected to the groove,
The movable member is configured such that a locking portion that locks the convex portion moves generally in a direction in which the vertical groove extends by its own movement, and the locking portion is at a position overlapping the outside of the vertical groove. It is operable between a first state and a second state in which the locking portion is removed from the longitudinal groove toward the other end,
The other has a biasing member that biases the movable member in a direction to move from the second state toward the first state,
When the presser foot is attached to the presser bar, as the protrusion enters the guide groove, the tip of the protrusion comes into contact with the locking part of the movable member, and When the stop portion is moved to the other end side of the longitudinal groove portion against the urging force of the urging member and the convex portion is inserted into the circumferential groove portion, the lock portion is moved against the urging force of the urging member. 6. The presser foot mounting structure according to claim 1, wherein the presser foot is moved by an urging force to a position overlapping the longitudinal groove.

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