JP7363422B2 - 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 a 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,
The presser bar includes a shaft body extending in the vertical direction, and a rotating body inserted into the shaft body so as to be rotatable around the axis of the shaft body,
A recess is formed at the lower end of the shaft, and a protrusion that is fitted into the recess is formed at the upper end of the presser foot. It is configured so that it engages with the
A vertical groove extending along the axial direction of the shaft body is formed on the inner peripheral side of the rotating body,
The presser foot includes a protrusion that protrudes outward from the outer circumferential surface of the shaft when the protrusion is fitted into the recess,
By positioning the rotating body at a first position where the position of the longitudinal groove in the circumferential direction coincides with the protrusion, the protrusion can be inserted into and removed from the longitudinal groove, and the presser foot Relative movement of the gold and the presser bar in the axial direction is allowed,
In a state in which the protrusion is fitted into the recess and the protrusion is inserted through the longitudinal groove and above the rotating body, the rotating body rotates from the first position to the second position. By being positioned at this position, the protrusion comes into contact with the upper surface of the rotating body, restraining movement of the presser foot in the axial direction with respect to the rotating body, and the presser foot is attached to the presser bar. It is characterized by being configured as follows.

A sewing machine that uses 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 rotating the rotating body from the first position to the second position. Moreover, the presser foot can be removed simply by rotating the rotating body from the second position to the first position 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, there is a rotating body under the protrusion of the presser foot, so there is no possibility of the presser foot falling off the presser bar. This can be avoided and the presser foot can be reliably supported.

In the above configuration, the rotating body has a guide groove on its upper surface that guides relative movement of the protrusion with respect to itself, and the guide groove has a flat surface that the lower surface of the protrusion abuts in the second position. and an inclined surface portion that extends in the circumferential direction from the flat portion to the vertical groove and descends from the flat portion toward the vertical groove.

In the mounting structure having this configuration, when the rotating body is rotated from the first position to the second position, the protrusion is moved upward by the inclined surface portion of the guide groove. In other words, by lifting the presser foot toward the shaft and almost eliminating the gap between it and the shaft, in other words, with this mounting structure, it is possible to almost eliminate looseness between the presser foot and the shaft. becomes.

Further, in the above configuration, the rotating body is a biased member that is biased upward toward the inclined surface portion of the flat portion and is held in a state in which a portion thereof protrudes from the upper surface of the flat portion. The rotating body may be rotated and a position where the biased member passes through the protrusion is the second position.

In the mounting structure having this configuration, the rotation of the rotating body in the direction in which it returns from the second position to the first position is restricted by the presence of the biased member. In other words, with this mounting structure, the rotating body is held in the second position by the biased member, and the rotating body returns to the first position during operation of the sewing machine, preventing the presser foot from coming off the presser bar. situations can be avoided.

Further, in the above configuration, the recess extends in a predetermined width in the radial direction at the lower end of the shaft body, and has a shape that opens on the lower surface side and both sides in the radial direction, and the protrusion has a shape that is wider than the predetermined width. By having a plate shape with a slightly small thickness, the shaft body and the presser foot can be configured to engage with each other in a manner that they cannot rotate relative to each other.

The mounting structure with this configuration has a limited configuration to prevent the presser foot from rotating around the axis with respect to the shaft.According to the mounting structure with this configuration, it is a relatively simple structure, and rotation can be prohibited.

Further, in the above structure, the width of the upper end of the convex portion is larger than the width of the lower part of the upper end, and the width of the upper end is larger than the diameter of the shaft, and the lower By setting the width of the side portion to be less than or equal to the diameter of the shaft body, both ends of the upper end portion in the width direction can function as the protruding portion.

The mounting structure of this configuration is embodied in a configuration in which a protrusion is provided in the above-described configuration in which the protrusion is plate-shaped. Although the convex portion of the presser foot in this mounting structure includes a protrusion, it has a relatively simple shape and can be formed relatively easily.

Further, in the above configuration, the convex portion may have a shape in which both ends of the upper end portion in the width direction protrude upward from an intermediate portion thereof.

In the mounting structure of this configuration, the convex part is shaped like a cutout (concave) in the middle part of the upper end, and when the presser foot is inserted into the shaft, the lower end of the shaft is It has a structure that fits into the middle part of the presser foot. Specifically, the middle portion of the upper end of the convex portion enters into the recess of the shaft, and the upwardly protruding portions at both ends overlap on the radially outer side of the shaft. In other words, in this mounting structure, when the presser foot is inserted into the shaft, movement of the presser foot in the radial direction (movement of the presser foot in the width direction) with respect to the shaft is restricted. Therefore, with this mounting structure, the presser foot can be easily inserted into the presser bar.

Further, in the above configuration, the presser bar includes a locking member that fixes the rotating body at the second position, and the locking member is provided above the rotating body with respect to the shaft body in the axial direction. and when the rotating body is in the second position, the locking member fits the protrusion of the presser foot into the insertion hole formed on the lower surface, and protrudes downward from the lower surface. The formed fitting protrusion can be configured to fit into the vertical groove of the rotating body.

In this mounting structure, the locking member engages with the longitudinal groove of the rotating body located in the second position and also engages with the protrusion of the presser foot, so that the rotating body is moved relative to the presser foot. Rotation can be prohibited. In other words, the mounting structure having this configuration can reliably avoid a situation where the rotating body returns to the first position during operation of the sewing machine and the presser foot comes off from the presser foot bar.

Further, in the above configuration, the rotating body may be configured to be movable in the axial direction with respect to the shaft body.

When inserting the protrusion of the presser foot into the recess of the shaft and the protrusion of the presser foot into the vertical groove of the rotating body at the same time, first place the rotating body in the first position relative to the shaft. It needs to be located. In this mounting structure, for example, with the rotating body shifted upward, the convex part of the presser foot is first inserted into the recess of the shaft, and then the protrusion of the presser foot is inserted into the vertical groove. By lowering the rotating body at the same time, it is possible to easily achieve a state in which the presser foot is inserted into the presser bar.

In the above configuration, the shaft body has a radially extending flange portion at the lower end, and a guard member is provided between the rotating body and the flange portion to prevent contact with the sewing machine needle. It can be configured to be pinchable.

Conventionally, a configuration in which a presser bar, a presser foot, and a guard member are fastened together with screws or the like has often been used. However, it is difficult to align the fastening holes of each of the three members, and even if only the presser foot is replaced, the guard member must also be removed, making replacing the presser foot a very complicated task. It became. In contrast, with this mounting structure, the guard member is removable from the presser bar, so there is no need to remove the guard member when replacing only the presser foot, making it easier to replace the presser foot. can be done. Further, since the guard member can be attached by simply raising the rotating body and sandwiching it between the rotating body and the flange portion, the guard member can be easily replaced.

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 showing the mounting structure of the presser foot according to the first embodiment of the present invention (with the presser foot attached to the presser bar) Exploded perspective view of the presser foot mounting structure of the first embodiment Exploded front view of the presser foot mounting structure of the first embodiment Exploded side view of the presser foot mounting structure of the first embodiment A perspective view of the rotating body shown in Figure 1 A plan view of the rotating body shown in FIG. Side sectional view of the rotating body shown in Figure 5 (A-A cross section in Figure 5) FIG. 3 is a diagram showing how to attach the guard member, and is a perspective view showing a state in which the rotating body is raised. An enlarged perspective view showing a state in which the rotating body is located at the first position. A plan view showing a state in which the rotating body is located at the first position. A view from below showing a state in which the rotating body is located in the first position. An enlarged perspective view showing a state in which the rotating body is located at the second position. A plan view showing a state in which the rotating body is located at the second position. Side sectional view showing a state in which the rotating body is located at the second position (BB cross section in FIG. 13) A perspective view showing the mounting structure of the presser foot of the second embodiment (with the presser foot attached to the presser bar) A perspective view showing a state in which the cover member shown in FIG. 15 is raised. Side view of the cover member shown in FIG. 15 Bottom view of the cover member shown in FIG. 15 A plan view of the presser foot mounting structure of the second embodiment Side sectional view of the presser foot mounting structure of the second embodiment (CC cross section in Fig. 19)

DESCRIPTION OF THE PREFERRED EMBODIMENTS Several embodiments of the present invention will be described below in detail as modes for carrying out the present invention, with reference to the drawings. Note that the present invention is not limited to the following examples, but can be implemented in various forms with various modifications and improvements based on the knowledge of those skilled in the art.

The presser foot mounting structure (hereinafter sometimes simply referred to as "mounting structure") of the first embodiment of the present invention is such that a workpiece such as cloth is attached to a presser foot bar 10 provided on the main body side of the sewing machine. This is a structure for attaching a presser foot 11 that presses down. The mounting structure of the first embodiment will be described with reference to FIGS. 1 to 14. 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.

In the mounting structure of this embodiment, as shown in FIGS. 2 to 4, a presser foot 11 and a guard member 12 for preventing the worker's fingers etc. from coming into contact with the sewing machine needle are attached to the presser foot bar 10. It has a removable structure. The mounting structure of this embodiment is an improvement on the conventional mounting structure, more specifically, the structure in which the presser foot is fastened to the presser bar with the screw 13. Therefore, the presser bar 10 in the mounting structure of this embodiment is fixed to the sewing machine-side shaft 14 that functions as a presser bar in the conventional mounting structure, and to the lower end of the sewing machine-side shaft 14 so that the sewing machine-side shaft 14 is moved downward. It is rotatable around the axis of the shaft 16 and movable in the axial direction with respect to the shaft 16 of the presser bar 10, which is constituted by the sewing machine side shaft 14 and the stretching member 15. The rotating body 17 is inserted therethrough. Further, the extension member 15 is fixed to the sewing machine side shaft body 14 using a screw 13 that is used for fastening a presser foot in a conventional mounting structure.

At the lower end of the shaft body 16, more specifically, at the lower end of the extending member 15, a flange portion 21 is formed that extends in the radial direction with respect to the shaft portion 20, and the lower end of the shaft body 16 is divided into left and right halves. A notch 22 is formed. That is, the notch 22 functions as a recess in the shaft 16, extends through the axis of the shaft 16 with a predetermined width in the front-rear direction (radial direction), and opens on the lower surface side, the front side, and the rear side. It is said to be the shape.

As shown in FIGS. 5 to 7, the rotating body 17 is an annular member having an insertion hole 30 that is smaller in diameter than the flange portion 21 and slightly larger than the diameter of the shaft portion 20 of the shaft body 16. With such a shape, as shown in FIG. 1, the rotating body 17 is rotatably supported by the flange portion 21 with respect to the shaft body 16. Further, as shown in FIG. 6, the rotating body 17 has a pair of vertical grooves 31 extending along the axial direction on the inner circumferential surface of the rotating body 17, which are opposed to each other with the axis of the body in between. A circumferential groove 32 is formed that communicates with the upper end of each of the vertical grooves 31 and extends in the circumferential direction (clockwise) on the upper surface of the rotating body 17 . As shown in FIGS. 5 and 7, the depth of the circumferential groove 32 becomes shallower as the distance from the vertical groove 31 increases, and the depth of the groove decreases at the end of the groove (the side opposite to the vertical groove 31). It is said to have a constant flat shape. That is, the circumferential groove 32 has a shape including a flat portion 32A and an inclined surface portion 32B that descends from the flat portion 32A toward the vertical groove 31. Furthermore, a through hole 33 penetrating in the axial direction is formed on the inclined surface portion 32B side of the flat portion 32A of each circumferential groove 32, and a ball plunger 34 is provided inside the through hole 33.

The presser foot 11 has a main body portion 40 at its lower end that presses the object to be sewn, and a supported portion 41 at its upper end that is supported by the presser foot bar 10. In addition, in the sewing machine in which the mounting structure of this embodiment is adopted, multiple types of presser feet are available depending on the type of sewing process such as regular stitching or embroidery stitching, and the type and thickness of the workpiece to be sewn. , these multiple types of presser feet are said to be interchangeable. These plural types of presser feet have different body shapes, and the body portion 40 of the presser foot 11 described in this embodiment has a relatively small width (horizontal dimension) and a tip side ( The front side) is split into two parts, with each tip curved upwards.

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. As shown in FIG. 3, the thickness (horizontal dimension) of the supported portion 41 is slightly smaller than the width of the notch 22 of the shaft body 16 (extended member 15). Further, as shown in FIG. 4, the supported portion 41 has an upper surface side notch 42 formed at the center in the front-rear direction on the upper surface side, and side surface side notches 43 on each of the front side surface and the rear side surface. is formed. The supported portion 41 has a width (dimension in the front-rear direction) between the two side notches 43 that is approximately equal to the diameter of the shaft portion 20 of the shaft body 16 . In other words, the width of the portion of the supported portion 41 above the side notch 43 is larger than the diameter of the shaft portion 20 . Furthermore, the dimension of the upper surface side notch 42 in the front-rear direction is slightly larger than the diameter of the shaft portion 20.

The supported portion 41 having the above shape has a portion between the two side notches 43 and below the top notch 42 inside the notch 22 that functions as a recess of the shaft body 16. This part functions as a protrusion that is inserted into the notch 22. In other words, in the mounting structure of this embodiment, the presser foot 11 is fixed by engaging the notch 22 extending with a predetermined width with the supported portion 41 which is plate-shaped and has a thickness slightly smaller than the predetermined width. It is adapted to be engaged with the rod 10 in a relatively non-rotatable manner. Further, a portion of the supported portion 41 above the side notch 43 and outside the top side notch 42 is located outside from the outer peripheral surface of the shaft body 16 when the supported portion 41 is fitted into the notch 22. This is a portion that functions as a protruding portion 41A that protrudes to the side.

As shown in FIG. 1, the guard member 12 is held on the presser bar 10 in such a manner that the annular guard body 50 opens forward above the body 40 of the presser foot 11. The guard main body part 50 is formed with an extension part 51 extending rearward from the left end thereof, and the tip side (rear end side) of the extension part 51 is supported by the presser bar 10. This will be the part that will be used. To be more specific, as shown in FIGS. 2 to 4, a notch 52 is formed on the lower surface side at the tip (rear end) of the extending portion 51, and a notch 52 is formed in the flange portion 21 of the presser bar 10. More specifically, on the left side of the notch 22 of the flange portion 21, a groove 21A extending in the front-rear direction is formed on the upper surface side. As shown in FIG. 8, it is possible to engage the tip of the extending portion 51 with the groove 21A of the flange portion 21 by aligning the notch 52 with the groove 21A. In this state, the upper surface of the extending portion 51 and the upper surface of the flange portion 21 are flush with each other. In this state, the rotating body 17 descends and comes into contact with the flange portion 21, so that the guard member 12 is sandwiched between the rotating body 17 and the flange portion 21, as shown in FIG. ing.

Conventionally, the guard member has often been fastened to the presser bar together with the presser foot using screws or the like. However, it is difficult to match the fastening holes of each of the three members, making replacing the presser foot a very complicated task. In contrast, in the mounting structure of this embodiment, the guard member 12 can be mounted by simply moving the rotating body 17 up and down and sandwiching it between the rotating body 17 and the flange portion 21, so that the guard member 12 can be replaced easily. can be easily done.

Next, the work of attaching the presser foot 11 will be described in detail with reference to FIGS. 9 to 14. Note that the guard member 12 is omitted in these drawings. When attaching the presser foot 11 to the presser bar 10, first, as shown in FIGS. 9 to 11, the position of the rotating body 17 with respect to the shaft 16 on the presser bar 10 is adjusted. Specifically, the rotating body 17 is positioned at a first position where the direction connecting the two longitudinal grooves 31 matches the direction in which the notch 22 of the shaft body 16 extends (front-back direction). By positioning the rotating body 17 at the first position, the notches 22 and the vertical grooves 31 communicate with each other in the vertical direction, and the supported portion of the presser foot 11 is placed in the space formed by the notches 22 and the vertical grooves 31. 41 can be inserted.

When the presser foot 11 is inserted into the space on the presser bar 10 side, the presser foot 11 can be inserted to a position where the upper surface side notch 42 of the supported part 41 contacts the top surface inside the notch 22. In this state, the upper surface side notch 42 and the notch 22 fit into each other. To be more specific, the supported portion 41 is in a state in which the outer portion (the upper end portion 41A1 of the protruding portion 41A) of the upper surface side notch 42 in the width direction (front-back direction) overlaps the outer side of the shaft portion 20, in other words, the protruding portion The shaft portion 20 is sandwiched between the upper end portions 41A1 of each of the presser feet 41A, and the position of the presser foot 11 in the front-rear direction relative to the presser bar 10 is determined. In other words, the presser foot 11 is allowed to move only in the axial direction with respect to the presser bar 10.

Furthermore, when the supported part 41 is inserted to a position where the upper surface side notch 42 contacts the top surface inside the notch 22, the protruding part 41A passes through the vertical groove 31 of the rotating body 17 and is positioned above the rotating body 17. It is now possible to do so.

Next, the rotating body 17 is rotated from the first position in the direction shown by the arrow in FIGS. 9 and 10. The pair of circumferential grooves 32 described above are formed in the rotating body 17, and when the rotating body 17 is rotated, the pair of protrusions 41A are guided along the pair of circumferential grooves 32. Then, it rotates relative to the rotating body 17. In other words, the pair of circumferential grooves 32 function as guide grooves. Note that when the rotating body 17 is rotated from the first position, the lower surface of the protrusion 41A comes into contact with the bottom surface of the circumferential groove 32 (the upper surface of the rotating body 17), so the presser foot 11 is Movement in the axial direction is restricted.

As described above (see FIGS. 5 to 7), the pair of circumferential grooves 32 have an inclined surface portion 32B on the vertical groove 31 side, and the bottom surface of the groove (the upper surface of the rotating body 17) is the vertical groove. The further away from 31, the higher it rises. That is, when the rotating body 17 is rotated and the protrusion 41A moves relatively along the inclined surface portion 32B, the protrusion 41A is lifted by the rotating body 17 and pulled upward.

When the rotating body 17 is further rotated, the protruding portion 41A reaches the flat portion 32A, more specifically, the ball plunger 34. As shown in FIG. 14, the ball plunger 34 includes a bottomed cylindrical housing 34A, a ball 34B disposed within the housing 34A so as to be movable in the axial direction of the housing 34A, and an interior of the ball 34B and the housing 34A. The ball 34B is biased by the spring 34C in the opening direction of the housing 34A, and a part of the ball 34B is held in a state protruding from the housing 34A. It is something. That is, when the rotating body 17 is rotated, the protrusion 41A passes through the ball 34B while pushing the ball 34B into the housing 34A against the elastic force of the spring 34C. Then, when the protrusion 41A passes the ball 34B, the ball 34B is returned upward, as shown in FIG. Therefore, in the mounting structure of this embodiment, the ball 34B functioning as a biased member prevents the protrusion 41A from returning to the vertical groove 31 side, that is, the direction of returning the rotating body 17 to the first position. Rotation can be regulated.

The position where the protrusion 41A passes the ball 34B is the second position of the rotating body 17, and when the rotating body 17 is located at this second position, the protrusion 41A passes through the ball 34B. The portion 41A is sandwiched between the inner wall portion 32C on the terminal end side of the circumferential groove 32 and the ball 34B. In other words, in the mounting structure of this embodiment, the rotating body 17 engages with the presser foot 11 without wobbling in the rotational direction.

Incidentally, the ball plunger 34 is screwed together using a male thread formed on the outer peripheral surface of the housing 34A and a female thread formed on the inner peripheral surface of the through hole 33, and is screwed into the rotating body 17 using a driver. It is possible to adjust the axial position of the ball plunger 34 with respect to the ball plunger 34, that is, the amount of upward protrusion of the ball 34B. The mounting structure of this embodiment makes it possible to adjust the force required when the protrusion 41A passes the ball 34B, or the force that restricts the rotation of the rotating body 17 in the direction of returning to the first position. There is.

As described above, by positioning the rotating body 17 in the second position shown in FIGS. 12 to 14, the presser foot 11 is attached to the presser bar 10, but in this state, the lower part of the protrusion 41A is Since the rotating body 17 is present in the presser bar 10, it is possible to reliably prevent the presser foot 11 from falling off from the presser bar 10. Further, due to the existence of the circumferential groove 32 having the inclined surface portion 32B formed on the rotating body 17, it is possible to pull up the presser foot 11 and bring it into contact with the shaft body 16. The upper surface side notch 42 can be brought into contact with the inner top surface of the notch 22 in the shaft body 16, eliminating the gap between the presser foot 11 and the shaft body 16, and allowing the presser foot 11 to be attached to the presser bar 10 without wobbling in the axial direction. It can be supported.

Therefore, in the mounting structure of this embodiment, with the rotating body 17 positioned at the first position, the presser foot 11 is inserted from below the presser bar 10, and the rotating body 17 is rotated to the second position. , the attachment of the presser foot 11 to the presser bar 10 is completed. Further, since the rotating body 17 can be moved in the axial direction with respect to the shaft body 16, the presser foot 11 can be moved while the rotating body 17 is moved upward as shown in FIGS. 2 to 4. After inserting the rotating body 17 into the notch 22 of the shaft body 16, the rotating body 17 is lowered to a position where it contacts the flange portion 21 of the shaft body 16, and by rotating the rotating body 17 to the second position, the presser bar of the presser foot 11 is removed. 10 can also be installed. On the other hand, when removing the presser foot 11 from the presser bar 10, the presser foot 11 can be pulled out from the presser bar 10 by simply rotating the rotating body 17 to the first position. As described above, the mounting structure of the present embodiment has a relatively simple structure, yet allows the presser foot 11 to be easily attached to and removed from the presser bar 10, and allows the presser foot 11 to be attached to the presser bar 10. In this state, the presser foot 11 can be firmly supported with respect to the presser bar 10 without wobbling.

The attachment structure of the presser foot according to the second embodiment will be described with reference to FIGS. 15 to 20. The mounting structure of the second embodiment has a configuration in which one member is added to the mounting structure of the first embodiment. That is, since the parts other than the added members are the same as the mounting structure of the first embodiment, the same reference numerals are given and the explanation will be omitted.

The mounting structure of the second embodiment includes a cover member 70 that covers the upper part of the rotating body 17, as shown in FIG. The cover member 70 is inserted through the shaft body 16 and disposed above the rotating body 17, and is movable along the shaft body 16, as shown in FIG. To explain the cover member 70 in detail, the cover member 70 is an annular member having an insertion hole 71 slightly larger than the diameter of the shaft portion 20 of the shaft body 16 and having the same diameter as the rotating body 17. . Further, as shown in FIGS. 17 and 18, the cover member 70 has a pair of fitting holes 72 formed on the lower surface side at positions facing each other across the axis, and between the pair of fitting holes 72, Specifically, a fitting protrusion 73 that projects downward from the lower surface is formed at the center of the pair of fitting holes 72 in the circumferential direction.

The cover member 70 can be lowered to a position where it abuts the upper end of the rotating body 17 when the rotating body 17 is in the second position and the presser foot 11 is supported by the shaft 16 and the rotating body 17. I can do it. Specifically, when the rotating body 17 is located in the second position, as shown in FIGS. 12 and 13, a pair of protrusions 41 are located in front and behind the shaft portion 20 of the shaft body 16, and A pair of vertical grooves 31 of the rotating body 17 are located on the right and left sides of the shaft portion 20. That is, the vertical groove 31 is located at the center of the pair of protrusions 41 in the circumferential direction. Therefore, as shown in FIG. 19, by aligning with the pair of protrusions 41 at a rotational position such that the pair of fitting holes 72 are lined up in the front-rear direction, the fitting protrusion 73 is aligned with one of the pair of vertical grooves 31 ( In FIG. 19, this corresponds to the position of the vertical groove 31) on the right side. When the cover member 70 is lowered in that position, the protrusion 41 of the presser foot 11 is fitted into the fitting hole 72, and the fitting protrusion 73 is fitted into the vertical groove 31 of the rotating body 17, as shown in FIG. That's what happens.

The cover member 70 is prevented from rotating relative to the presser foot 11 by engaging with the protrusion 41 of the presser foot 11, and is prevented from rotating relative to the rotating body 17 by engaging with the vertical groove 31 of the rotating body 17. It is forbidden. That is, the cover member 70 functions as a locking member that prohibits rotation of the rotating body 17 with respect to the presser foot 11, and can reliably prohibit the rotating body 17 from returning from the second position to the first position. . Therefore, the mounting structure of the second embodiment can reliably avoid a situation where the rotating body 17 returns to the first position and the presser foot 11 comes off from the presser foot bar 10 due to vibrations caused by the operation of the sewing machine. .

Incidentally, the cover member 70 has a vertical groove 74 formed on the inner circumferential side that communicates with the insertion hole 71 and extends in the axial direction. When moving the cover member 70 upward, although the screw 13 is present on the shaft body 16, the vertical groove 74 allows the cover member 70 to pass through the screw 13 and be moved above the screw 13. Then, by rotating the cover member 70 above the screw 13 and shifting the vertical groove 74 from the screw 13, the cover member 70 is engaged with the screw 13 (the downward movement of the cover member 70 with respect to the shaft body 16 is prevented). prohibited). By setting it in such a state, the cover member 70 does not interfere with the work of attaching and detaching the presser foot 11, and in the work of attaching and detaching the presser foot 11, it is possible to suppress a decrease in workability with respect to the mounting structure of the first embodiment. .

<Other embodiments>
Since the mounting structure of the two embodiments described above is an improvement on the conventional sewing machine, the shaft body 16 is divided into two parts, but it may be formed integrally. Furthermore, in the mounting structures of the two embodiments described above, the rotating body 17 is movable in the axial direction with respect to the shaft 16, but the rotating body 17 may be configured to be rotatable around the axis of the shaft 16. Bye. Furthermore, in the mounting structures of the two embodiments described above, the shapes of the convex part (supported part 41) of the presser foot 11 and the concave part (notch 22) of the shaft body 16 are not limited to the shapes of the above embodiments, but are relative to each other. Any shape is sufficient as long as it is non-rotatably engaged.

DESCRIPTION OF SYMBOLS 10... Presser bar, 11... Presser foot, 12... Guard member, 14... Sewing machine side shaft body, 15... Extension member, 16... Shaft body, 17... Rotating body, 20... Shaft part, 21... Flange part, 22... Notch [Recess], 31... Vertical groove, 32... Circumferential groove [guide groove], 32A... Plane part, 32B... Inclined surface part, 34... Ball plunger, 34B... Ball [forced member], 41... Supported part [Protrusion], 41A...Protrusion, 42...Top side notch, 43...Side side notch, 70...Cover member [lock member], 72... Fitting hole, 73... Fitting protrusion

Claims (9)

A presser foot mounting structure for a sewing machine in which the presser foot is removably attached to a presser bar,
The presser bar includes a shaft body extending in the vertical direction, and a rotating body inserted into the shaft body so as to be rotatable around the axis of the shaft body,
A recess is formed at the lower end of the shaft, and a protrusion that is fitted into the recess is formed at the upper end of the presser foot. It is configured so that it engages with the
A vertical groove extending along the axial direction of the shaft body is formed on the inner peripheral side of the rotating body,
The presser foot includes a protrusion that protrudes outward from the outer circumferential surface of the shaft when the protrusion is fitted into the recess;
By positioning the rotating body at a first position where the position of the longitudinal groove in the circumferential direction coincides with the protrusion, the protrusion can be inserted into and removed from the longitudinal groove, and the presser foot Relative movement of the gold and the presser bar in the axial direction is allowed,
In a state in which the protrusion is fitted into the recess and the protrusion is inserted through the vertical groove and above the rotating body, the rotating body rotates from the first position to the second position. By being positioned at this position, the protrusion comes into contact with the upper surface of the rotating body, restraining movement of the presser foot in the axial direction with respect to the rotating body, and the presser foot is attached to the presser bar. The mounting structure of the presser foot is configured as follows. The rotating body has a guide groove on its upper surface that guides relative movement of the protrusion with respect to itself,
The guide groove includes a flat part that the lower surface of the protrusion comes into contact with at the second position, and a sloped part that extends in the circumferential direction from the flat part to the vertical groove and descends from the flat part toward the vertical groove. The presser foot mounting structure according to claim 1, comprising: The rotating body includes a biased member on the inclined surface side of the flat portion that is biased upward and held in a state where a portion thereof protrudes from the upper surface of the flat portion;
3. The presser foot mounting structure according to claim 2, wherein a position where the rotating body is rotated and the biased member passes through the protrusion is the second position. The recess has a shape that extends with a predetermined width in the radial direction at the lower end of the shaft body and is open on the lower surface side and both sides in the radial direction, and the protrusion has a thickness smaller than the predetermined width. 4. The presser foot mounting structure according to claim 1 , wherein the presser foot is plate-shaped, and the shaft body and the presser foot are configured to engage with each other so as not to rotate relative to each other. The width of the protrusion is larger than the width of the lower part of the upper end, the width of the upper end is larger than the diameter of the shaft, and the width of the lower part is larger than the width of the lower part of the protrusion. The presser foot mounting structure according to claim 4, wherein both ends of the upper end portion in the width direction function as the protruding portions by making the diameter smaller than or equal to the diameter of the shaft body. 6. The presser foot mounting structure according to claim 5, wherein the convex portion has a shape in which both ends in the width direction of the upper end portion protrude upwardly from an intermediate portion thereof. The presser bar includes a locking member that fixes the rotating body at the second position,
The locking member is provided above the rotating body with respect to the shaft body and is movable in the axial direction,
When the rotating body is in the second position, the locking member fits the protrusion of the presser foot into the insertion hole formed on the lower surface, and the insertion projection formed to protrude downward from the lower surface of the locking member. 7. The presser foot mounting structure according to claim 1, wherein the presser foot is configured to fit into the vertical groove of the rotating body. The presser foot mounting structure according to any one of claims 1 to 7, wherein the rotating body is movable in the axial direction with respect to the shaft body. The shaft body has a flange portion extending in a radial direction at a lower end,
9. The presser foot mounting structure according to claim 8, wherein a guard member for preventing contact with a sewing machine needle can be held between the rotating body and the flange portion.

Images