JP2011125688A - Attachment for sewing machine, sewing machine and sewing method - Google Patents

Abstract

An attachment for a sewing machine, a sewing machine, and a sewing method are provided that are advantageous in preventing sewing stitches in which upper and lower cloths are fed while being shifted during sewing.
A sewing machine attachment 10 used for a sewing machine capable of raising a work material presser from a lower end position by a rotation operation of a lever 6, comprising a main body 11 and a movable part 12 attached to the main body 11. The main body 11 is attached to the sewing machine so as to move integrally with the rotational movement of the knee-lifting lever 6, and the movable part 12 abuts the tip of the movable part 12 against the sewing machine. 6 is stationary, and the amount of extension of the movable part 12 from the main body part 11 can be adjusted.
[Selection] Figure 6

Description

  The present invention relates to a mechanism capable of holding a presser of a workpiece from a lower end position by rotating a lever and a mechanism capable of holding the presser in a position raised from the lower end position and a sewing method using the mechanism.

  In sewing using a sewing machine, sewing proceeds with a plurality of cloths sandwiched between the support surface and the presser. Some industrial sewing machines use a knee-lifting lever for lifting the presser to the upper side (see Patent Documents 1 and 2). The knee lift lever is connected to a presser bar integral with the presser via a link mechanism.

  By pressing the knee against the pad attached to the knee lift lever and rotating the knee lift lever, the presser is raised according to the rotation angle of the knee lift lever. When the knee lifter lever is fully rotated, the presser is raised to the upper end position. In this state, the cloth can be placed on the support surface.

  As the force of the knee holding the pad is released, the knee lift lever returns to the original position and the presser is lowered. When the knee is released from the pad, the presser presses the cloth by the repulsive force of the spring attached to the presser bar integrated with the presser. Sewing is started in this state.

Japanese Patent Laid-Open No. 11-19364 JP 2006-149440 A

  In the conventional sewing machine as described above, the presser presses the cloth during sewing. In this configuration, when the upper and lower cloths are stitched together, the lower cloth on the support surface side is fed by the feed dog, but the upper cloth on the presser side is pressed by the presser. For this reason, there has been a case where a phenomenon called “sewing” occurs in which the upper and lower cloths are fed while being shifted. Depending on the material of the fabric, it is difficult to adjust the stitching manually.

  The present invention solves the conventional problems as described above, and provides an attachment for a sewing machine, a sewing machine, and a sewing method that are advantageous in preventing sewn stitches in which upper and lower cloths are fed while being shifted during sewing. Objective.

  To achieve the above object, the attachment for a sewing machine according to the present invention is an attachment for a sewing machine used for a sewing machine capable of raising a work material presser from a lower end position by rotating a lever. A movable portion attached to the main body, and the main body is attached to the sewing machine so as to move integrally with the rotational movement of the lever. The lever is brought into contact with a sewing machine, and the amount of extension of the movable part from the main body can be adjusted.

  The sewing machine of the present invention is a sewing machine that can raise the work material presser from the lower end position by rotating the lever, and includes an adjustment mechanism that adjusts the stationary position of the lever. A main body part and a movable part attached to the main body part. The main body part moves integrally with the rotational movement of the lever, and the movable part makes its tip abut against the sewing machine. The lever is stationary, and the amount of extension of the movable part from the body part can be adjusted.

  A first sewing method of the present invention is a sewing method using a sewing machine to which the attachment for sewing machine of the present invention is attached, wherein the workpiece is placed under the presser, and the extension of the movable portion is performed. By adjusting the protruding amount, the stationary position of the lever is adjusted, the presser is held at a position raised from the lower end position, and the workpiece is sewn in the held state.

  A second sewing method of the present invention is a sewing method using the sewing machine of the present invention, wherein the workpiece is placed on the lower side of the presser, and the extension amount of the movable portion is adjusted to adjust the extension amount. The lever is adjusted in a stationary position, the presser is held at a position raised from the lower end position, and the workpiece is sewn in the held state.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes advantageous at the time of sewing, and prevention of the stitching | stitching which upper and lower cloth is sent while shifting.

FIG. 1 is a front view of a sewing machine according to an embodiment of the present invention. FIG. 2 is a view showing a main part in a state where the attachment 10 is removed from the sewing machine of FIG. FIG. 3 is a side view of the presser in the sewing machine according to the embodiment of the present invention. FIG. 4 is a perspective view of the attachment 10 according to the embodiment of the present invention. FIG. 5 is an enlarged view of the vicinity of the knee raising lever 6 in FIG. FIG. 6 is a main part perspective view showing a state in which the attachment 10 according to the embodiment of the present invention is attached to the sewing machine. FIG. 7A is a side view showing a state in which two cloths are interposed between the presser 5 and the feed dog 52, and FIG. 7B shows a state in which the height of the presser 5 is changed from the height h1 to h2. 7C is a side view showing a state in which three cloths are interposed between the presser 5 and the feed dog 52. FIG. FIG. 8 is a front view showing the knee-lifting lever 6 and the attachment 10 in the state of FIG. 7A in the embodiment of the present invention. FIG. 9 is a front view showing a state in which the tip of the contact portion 19 of the attachment 10 is in contact with the plate 22 in the embodiment of the present invention. FIG. 10 is a perspective view of an attachment 30 according to an embodiment of the present invention. FIG. 11 is a side view of the attachment 30 according to the embodiment of the present invention. FIG. 12 is a diagram showing a state in which the small piece 54 sandwiched between the hands 31 is carried to the position of the plate 22 by rotating the arm 32 in the embodiment of the present invention. FIG. 13 is a front view of the vicinity of the attachment 10 in the state of FIG. 12 in the embodiment of the present invention. 14A and 14B are views showing a state in which a thin piece is sandwiched between the cloth 53 and the presser 5 in one embodiment of the present invention, FIG. 14A is a side view, and FIG. 14B is a plan view. It is. FIG. 15 is a front view of the sewing machine 1 according to the embodiment of the present invention. FIG. 16 is a side view of the sewing machine 1 according to the embodiment of the present invention.

  According to the attachment for a sewing machine, the sewing machine, and the sewing method of the present invention, the position of the presser does not press the work material or the press force is sufficiently small while eliminating the gap between the presser and the work material. It can be held in advance in a restrained position. By starting the sewing in this state, it is advantageous for preventing sewn stitches in which the upper and lower cloths are fed while being shifted during sewing.

  The attachment for a sewing machine according to the present invention is for adjusting the stationary position of the lever by adjusting the extension amount of the movable portion and holding the presser in a position raised from the lower end position. It is preferable.

  In addition to the main body and the movable part, the arm further includes an arm including a hand that holds the small piece of the workpiece, and the arm holds the small piece held by the hand up to a tip position of the movable part. It is preferable to move it. According to this configuration, when the number of cloths to be sewn is increased, the height of the presser can be easily set.

  Moreover, when the movable part is attached to the main body part, the movable part is preferably screwed to the main body part, and the extension amount can be adjusted by rotating the movable part. . According to this configuration, the extension amount of the movable portion can be easily adjusted with a simple structure.

  In the sewing machine of the present invention, the adjustment mechanism adjusts the stationary position of the lever by adjusting the extension amount of the movable portion, and holds the presser in a position raised from the lower end position. It is preferable that.

  Moreover, it is preferable to further include an arm including a hand that holds a small piece of the workpiece, and the arm moves the small piece held by the hand to a tip position of the movable portion. According to this configuration, when the number of cloths to be sewn is increased, the height of the presser can be easily set.

  Moreover, it is preferable that the said movable part is screwed together with the said main-body part, and can rotate the said movable part and can adjust the said extension amount. According to this configuration, the extension amount of the movable portion can be easily adjusted with a simple structure.

  Further, the apparatus further includes a support base that supports the main body of the sewing machine, and the support base has a height that increases from the presser side toward the inside of the main body in a direction orthogonal to the feed direction of the workpiece. It is preferable to incline so that becomes low. According to this configuration, when the stitch ruler is attached to the inside of the main body of the sewing machine, the end surface of the workpiece is easily guided by the guide surface of the stitch ruler.

  In addition, it is preferable that the apparatus further includes a support base that supports the main body of the sewing machine, and the support base is inclined so as to decrease in height as it advances in the feed direction of the workpiece. According to this configuration, the workpiece can be easily fed.

  In the first and second sewing methods, a thin piece is sandwiched between the processed material and the presser, and the extension amount of the movable portion is set according to the degree of extraction force of the thin piece. Is preferred. According to this configuration, the height of the presser can be easily finely adjusted and accuracy can be improved as compared with the method of finely adjusting the workpiece while shifting the workpiece.

  Further, when the work material is further overlapped with the work material and sewn, a small piece of the work material is sandwiched between the tip of the movable part and a part of the sewing machine to change the stationary position of the lever. Preferably, the presser is held at a position raised by the thickness of the small piece, and the workpiece is sewn in the holding state. According to this configuration, when the number of cloths to be sewn is increased, the height of the presser can be easily set.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a front view of a sewing machine 1 according to an embodiment of the present invention. The sewing machine body 2 is mounted on the support base 3 to which the leg portions 4 are fixed. A cloth, which is a processed material, is placed under the presser 5 and sewn.

  The sewing machine 1 includes a knee raising lever 6. By pushing the knee against the pad 7 attached to the knee raising lever 6, the knee raising lever 6 rotates in the direction of arrow a. In accordance with this rotation, the presser 5 rises in the direction of arrow b. With the presser 5 raised to the upper end position, the cloth can be taken out from the lower side of the presser 5 or the cloth can be placed on the lower side of the presser 5.

  The sewing machine 1 includes attachments 10 and 30 that are retrofitted to the sewing machine 1. The attachment 10 is for adjusting the holding position of the presser 5 by adjusting the stationary position of the knee-lifting lever 6. The attachment 10 will be described later with reference to FIGS. 4-6.

  The attachment 30 is for carrying a small piece of cloth to the position of the attachment 10. The attachment 30 will be described later with reference to FIGS. 10-11.

  Before describing the attachment 10, an operation of the sewing machine 1 in a state where the attachment 10 is not attached will be described.

  FIG. 2 shows a main part in a state where the attachment 10 is removed from the sewing machine 1 of FIG. The end of the knee-raising lever 6 is inserted through the fixing tool 8, whereby the knee-raising lever 6 is fixed to the fixing tool 8. A shaft 40 is further fixed to the fixture 8. The fixture 8 can rotate around the center 40 a of the shaft 40. Therefore, the knee-lifting lever 6 can rotate around the center 40 a of the shaft 40 via the fixture 8.

  As described above, the knee-lifting lever 6 can be rotated in the direction of the arrow a by pushing the pad 7 while placing the knee on it. Together with this rotation, the fixture 8 and the shaft 40 also rotate. The shaft 40 is bent in an L shape, and the end of the shaft 40 rises in the direction of the arrow c as the fixture 8 rotates.

  Along with this, the shaft 41 is lifted in the direction of the arrow d, the lever 42 rotates in the direction of the arrow e, and the shaft 43 and the lever 44 are pulled in the direction of the arrow f. As a result, the fixed piece 46 and the presser bar 45 fixed thereto are lifted in the direction of the arrow b, and the presser 5 integrated with the presser bar 45 is also lifted in the direction of the arrow b.

  A spring pressure by a spring 47 is applied to the presser bar 45 so as to press the presser 5 against the support surface 50 side. For this reason, the presser bar 45 moves upward in the direction of arrow b while compressing the spring 47. Therefore, when the force applied to the pad 7 is released, the presser bar 45 is lowered by the repulsive force of the spring 47. Accordingly, the lever 44, the shaft 43, the lever 42, the shaft 41, and the shaft 40 move in the opposite direction to when the presser bar 45 is raised, and the knee raising lever 6 returns to the original position.

  FIG. 3 shows a side view of the presser 5. The presser 5 is disposed at the position of the needle 51, and the lower surface of the presser 5 is in contact with the feed dog 52 protruding from the support surface 50. This state is a state when the knee-lifting lever 6 is at a non-rotating stationary position in FIG. Therefore, in the state of FIG. 3, the presser 5 presses the feed dog 52 by the repulsive force of the spring 47 (FIG. 2).

  As described above, in FIG. 2, when the knee-lifting lever 6 is rotated in the direction of arrow a, the presser 5 is raised in the direction of arrow b. The broken line in FIG. 3 shows a state where the knee-lifting lever 6 is fully rotated and the presser 5 is raised to the upper end position of the height h. Accordingly, by changing the rotation angle of the knee-lifting lever 6 while applying a force to the pad 7, the presser 5 is shown by a broken line in FIG. 3 from the lower end position where the presser 5 contacts the feed dog 52. It can be temporarily held at any position up to the upper end position.

  On the other hand, when the force applied to the pad 7 is released, the presser 5 returns to the lower end position in contact with the feed dog 52 by the repulsive force of the spring 47 (FIG. 2).

  FIG. 4 shows a perspective view of the attachment 10 shown in FIG. The attachment 10 includes a main body part 11 and a movable part 12. The main body portion 11 includes an attachment portion 13 to the sewing machine 1 (FIG. 1) and a support portion 14 that supports the movable portion 12. The attachment portion 13 is attached to the fixture 8 with screws 15 and 16 with both ends of the fixture 8 (FIG. 2) sandwiched therebetween. The support portion 14 is attached to the attachment portion 13 with a screw 17.

  The movable portion 12 includes a shaft 18, and a contact portion 19 and a knob portion 20 are attached to the shaft 18. A male screw is formed on the shaft 18, and the male screw is formed in the hole 21 of the support portion 14, so that the screw is screwed. Therefore, by rotating the knob part 20, the movable part 12 can be moved in the vertical direction (arrow g direction). Thereby, the extension amount d of the movable part 12 from the main body part 11 can be adjusted, and the distance from the main body part 11 at the tip of the contact part 19 changes.

  Note that the attachment 10 shown in FIG. 4 is an example, and can be attached so as to move integrally with the rotational movement of the knee-lifting lever 6. The attachment 10 includes a movable part, and the amount of extension of the movable part from the main body part Other configurations may be used as long as is adjustable.

  FIG. 5 shows an enlarged view of the vicinity of the knee raising lever 6 in FIG. In the state of this figure, the attachment 10 shown in FIG. 4 is not yet attached to the fixture 8. A plate 22 is attached to the back side of the support 3 (FIG. 1) with screws 23. The plate 22 is a portion where the tip of the contact portion 19 of the attachment 10 shown in FIG. 4 contacts directly or via a small piece of cloth.

  FIG. 6 is a main part perspective view showing a state in which the attachment 10 is attached to the sewing machine 1. This figure has shown the state which attached the attachment 10 shown in FIG. 4 to the fixing tool 8 of the state of FIG.

  In FIG. 5, the screw 24 of the fixture 8 is removed, and the screws 15 and 16 (FIG. 4) are tightened in a state where both ends of the fixture 8 are sandwiched between the attachment portions 13 of the attachment 10 of FIG. As a result, the attachment 10 is fixed to the fixture 8 as shown in FIG. Hereinafter, a sewing method using the attachment 10 will be described.

  FIG. 7A shows a state in which two cloths 53 are interposed between the presser 5 and the feed dog 52. The height of the presser 5 from the support surface 50 is a height h1. The state shown in this figure is a state in which the presser 5 is lowered from the upper end position of the height h, and the presser 5 is held at a position where the presser 5 starts to contact the cloth 53.

  Therefore, in the state of FIG. 7A, the presser 5 is held at a position where the cloth 53 is not pressed. That is, even if the cloth 53 is removed from the state of FIG. 7A, the presser 5 maintains the height h1. Hereinafter, the process up to the state shown in FIG. 7A will be described with reference to FIGS.

  FIG. 8 is a front view showing the knee-raising lever 6 and the attachment 10 in the state of FIG. 7A. When the force F applied to the pad 7 integrated with the knee raising lever 6 is increased, the knee raising lever 6 rotates in the direction of arrow a about the center 40 a of the shaft 40.

  The knee raising lever 6 shown by the broken line in FIG. 8 shows a state in which the knee raising lever 6 is fully rotated. In this state, like the presser 5 shown by the broken line in FIG. In this state, the cloth 53 can be placed on the support surface 50.

  When the force F applied to the pad 7 is loosened from the state of the knee lift lever 6 shown by the broken line, the knee lift lever 6 rotates in the direction opposite to the arrow a and moves toward the original position. This movement is due to the repulsive force of the spring 47 (FIG. 2). Along with this movement, the presser 5 shown by the broken line in FIG. 7A descends toward the support surface 50 side.

  The position of the knee-lifting lever 6 shown by the solid line in FIG. 8 is a position where the height of the presser 5 in FIG. 7A becomes the height h1. A force F is applied to the pad 7, and the knee-lifting lever 6 is temporarily held at the position indicated by the solid line. As described above, the height h <b> 1 in FIG. 7A is a position where the presser 5 starts to contact the cloth 53.

  In order to temporarily hold the knee-raising lever 6 so as to be in this position, fine adjustment may be necessary. In this case, for example, fine adjustment can be performed while shifting the cloth 53 back and forth. Such fine adjustment can be performed using both hands if the knee is applied to the pad 7 and a force F is applied. A method for facilitating fine adjustment will be described later with reference to FIG.

  In FIG. 8, a line 55 indicates the central axis of the shaft 18. A line 54 indicates the central axis of the shaft 18 at the initial position of the knee raising lever 6. In the example of this figure, the line 54 is a line orthogonal to the support base 3. In the state of FIG. 8, the central axis of the shaft 18 is displaced from the line 54 to the position of the line 55 as compared with the initial position of the knee lifter lever 6, and the shaft 18 is inclined by an angle θ1 as compared with the initial position. Yes. In addition, a gap s is formed between the tip of the contact portion 19 and the plate 22.

  When the force F is released from this state, in FIG. 7A, the presser 5 tries to further descend from the position of the height h1 by the repulsive force of the spring 47 (FIG. 2), and presses the cloth 53.

  In the present embodiment, since the attachment 10 is provided, even when the force F is released, the state where the presser 5 is at the height h1 can be maintained as shown in FIG. 7A. This will be described below with reference to FIGS.

  In FIG. 8, the shaft 18 is screwed into the hole 21 of the support portion 14. For this reason, the extension amount d of the movable portion 12 from the support portion 14 can be adjusted by rotating the knob portion 20. In FIG. 8, the extension amount d is d1. From this state, when the knob portion 20 continues to rotate in the direction of increasing the extension amount d, the gap s disappears and the tip of the contact portion 19 contacts the plate 22.

FIG. 9 is a front view showing a state in which the tip of the contact portion 19 is in contact with the plate 22. The extension amount d of the movable part 12 from the support part 14 changes to d2 larger than d1 in FIG. 8, and the gap s is eliminated. In this case, the shaft 18 is moved from the state shown in FIG.
8, the angle θ1 in FIG. 8 is maintained in FIG. 9 as well.

  Further, since the tip of the contact portion 19 is in contact with the plate 22, there is no room for the attachment 10 to move, and the shaft 18 is inclined by the angle θ1 even when the force F applied to the pad 7 is released. Is maintained. In this case, also with respect to the presser 5, the height h1 of FIG. 7A is maintained, and the state where the presser 5 does not press the cloth 53 is also maintained.

  On the other hand, in the conventional sewing machine, when sewing is started, the presser 5 toward the support surface 50 side is lifted to the position of the height h1 by the repulsive force of the spring 47 (FIG. 2). ing. In this state, the presser 5 presses the cloth 53. In this case, the lower cloth on the support surface 50 side is fed by the feed dog, but the upper cloth on the presser 5 side is pressed by the presser 5. For this reason, it is easy to produce the phenomenon of sewing that the upper and lower cloths are fed while being shifted.

  In the present embodiment, as described above, the gap between the presser 5 and the cloth 53 is eliminated, and the position of the presser 5 can be suppressed to a position where the presser 5 does not press the cloth 53 or the pressing force is sufficiently small. Can be held in advance. If sewing is started in this state, the upper cloth on the presser 5 side easily moves together with the lower cloth on the support surface 50 side at the time of sewing, and the upper and lower cloths are prevented from being displaced by hand. It is also easy.

  That is, according to the sewing method according to the present embodiment, compared to the conventional sewing method in which the sewing proceeds while pressing the cloth 53 with a strong pressing force by the presser 5, it is advantageous in preventing sewing.

  The case where two cloths are stitched together has been described above, but the case where three cloths are stitched together will be described below. In the state shown in FIG. 7A, after the two cloths are stitched together, the cloths may be folded back and the three cloths may be stitched together. This example will be described.

  The state of FIG. 7A is a state where the presser 5 does not press the cloth 53 as described above. In this state, when the cloth 53 on the lower side of the presser 5 is set to three, the presser 5 is lifted and the presser 5 presses the cloth 53 by the repulsive force of the spring 47 (FIG. 2).

  In order to prevent the presser 5 from pressing the cloth 53, as described with reference to FIGS. 8 and 9, the extension of the movable part 12 from the support part 14 is performed in the same manner as the adjustment procedure in the case of two cloths. The output d may be readjusted.

  On the other hand, the sewing machine 1 according to the present embodiment has an attachment 30 (FIG. 1) attached separately from the attachment 10. By using this attachment 30, it is easy to set the height of the presser 5 when adding the number of stitches.

  FIG. 10 is a perspective view of the attachment 30. FIG. 11 shows a side view of the attachment 30. The attachment 30 includes an arm 32 in which a hand 31 is integrated. The hand 31 forms a gap 31a (FIG. 11), and a small piece 54 of cloth can be sandwiched in the gap 31a. This small piece 54 is the same as the cloth to be sewn.

  In FIG. 11, the support plate 33 is fixed to the back surface of the support base 3 (FIG. 1) by screws 34. The arm 32 and the connecting member 35 are fixed by screws 36, and the connecting member 35 is rotatably attached to the support plate 33 by bolts 37. Thus, in FIG. 10, the arm 32 can rotate in the direction of the arrow k around the bolt 37. By this rotation, the small piece 54 sandwiched between the hands 31 can be carried to the plate 22 side.

  Note that the attachment 30 shown in FIGS. 10 and 11 is an example, and other mechanisms may be used as long as the small piece 54 held by the hand can be moved to the tip position of the movable portion 12.

  Hereinafter, the usage method of the attachment 30 is demonstrated. As described above, when the height from the support surface 50 of the presser 5 is the height h1 as shown in FIG. 7A, the inclination angle of the shaft 18 of the attachment 10 is θ1, as shown in FIG. Yes.

  When the knee-lifting lever 6 is rotated in the arrow a direction from the state where the contact portion 19 is in contact with the plate 22 as shown in FIG. 9, a gap is formed between the contact portion 19 and the plate 22. In a state where this gap is formed, the arm 54 of the attachment 30 in FIG. 10 can be rotated to carry the cloth 54 sandwiched between the hands 31 to the lower gap of the plate 22.

  FIG. 12 shows a state where the small piece 54 sandwiched between the hands 31 is carried to the position of the plate 22 by rotating the arm 32. In the state of this figure, the force which rotated the knee raising lever 6 is cancelled | released, and the front-end | tip of the contact part 19 is contact | abutted to cloth.

  FIG. 13 shows a front view of the vicinity of the attachment 10 in the state of FIG. A small piece 54 is sandwiched between the contact portion 19 and the plate 22. Therefore, as compared with FIG. 9 before the small piece 54 is sandwiched, the attachment 10 and the knee-lifting lever 6 are rotated in the direction of the arrow a about the center 40 a of the shaft 40.

  That is, the inclination angle θ1 in FIG. 9 changes to an angle θ2 larger than the angle θ1 in FIG. Accordingly, the height of the presser 5 in FIG. 7A is increased by the height corresponding to the angle difference between the angle θ2 and the angle θ1, that is, the thickness of the small piece 54.

  FIG. 7B is a side view showing a state in which the height of the presser 5 has changed from the height h1 to h2. The position of the presser 5 in this figure is the position when the contact portion 19 contacts the small piece 54 as shown in FIG. The height of the presser 5 is the height h1 in FIG. 7A, whereas in FIG. 7B, a gap t is added to the height h2 in FIG. 7B. The gap t corresponds to the thickness of the small piece 54.

  In FIG. 13, the presser 5 can be lifted to the upper end position of the height h in FIG. 7B by rotating the knee-lifting lever 6 in the direction of arrow a and moving it to the position of the broken broken line in FIG. 7B. . In this state, three cloths 53 stacked on the support surface 50 can be placed. Next, in FIG. 13, when the force applied to the pad 7 is released, the knee-lifting lever 6 returns to the position shown by the solid line in FIG. Accordingly, the height of the presser 5 returns again to the position of the height h2 in FIG. 7B.

  FIG. 7C is a side view showing a state in which three cloths 53 are placed on the lower side of the presser 5. The state shown in this figure is not a state in which the cloth 53 lifts the presser 5 but a state in which three cloths are placed under the presser 5 held at the position of the height h2. Therefore, the state of FIG. 7C is a state in which the pressing force by the presser 5 is not applied to the cloth 53 or a state in which the pressing force is sufficiently suppressed. Therefore, if sewing is started in the state of FIG. 7C, it is advantageous for preventing any sewing as in the case of sewing two cloths.

  As described above, by using the attachment 30, the height of the presser 5 can be easily set when the number of cloths to be sewn is increased.

  Next, another example of the height setting of the presser 5 will be described. As described above, the position of the height h1 of the presser 5 in FIG. 7A is a position where the pressing force by the presser 5 is not applied to the cloth 53 or a position where the pressing force is sufficiently suppressed. Such a position setting may require fine adjustment. Hereinafter, a method for facilitating fine adjustment of the height of the presser 5 will be described with reference to FIG.

  14A and 14B show a state in which the thin piece 55 is sandwiched between the cloth 53 and the presser 5, FIG. 14A is a side view, and FIG. 14B is a plan view. The thin piece 55 is, for example, a piece of paper. 14A and 14B, the thin piece 55 is extracted in the directions of the arrows m and n.

  Whether or not the height of the presser 5 is at the target position is determined based on the level of the pulling force when pulling. For example, when it is determined that the extraction force of the thin piece 55 is smaller than the reference size, the presser 5 is lowered. The thin piece 55 is repeatedly inserted and removed until it can be determined that the extraction force is the reference magnitude.

  In order to lower the presser 5, the extension distance d from the support 14 of the movable portion 12 may be reduced by rotating the knob 20 in FIG. 9. As the extension distance d becomes smaller, the knee-lifting lever 6 is displaced in a direction opposite to the arrow a direction, and the presser 5 is lowered. Since the contact portion 19 contacts the plate 22 in the state where the extension distance d is reduced, the position where the presser 5 is held is lowered. The fine adjustment of the presser 5 can be performed in the same manner as described above. Such fine adjustment using the thin piece 55 facilitates fine adjustment and can improve accuracy as compared with the method of fine adjustment while shifting the cloth 53.

  Next, an embodiment relating to the support base 3 of the sewing machine body 2 will be described. FIG. 15 is a front view of the sewing machine 1, and FIG. 16 is a side view of the sewing machine 1.

  As described above, according to the sewing method using the attachment 10, it is advantageous for preventing stitching. The embodiment shown in FIG. 15 is an embodiment for making the prevention of stitching more advantageous.

  In FIG. 16, the direction of arrow p is the cloth feeding direction. Therefore, in the front view of FIG. 15, the arrow q direction is a direction orthogonal to the cloth feeding direction.

  As shown in FIG. 15, a stitch ruler 60 is attached to the sewing machine body 2 adjacent to the presser 5. The stitch ruler 60 includes a guide surface 61 and can guide the end surface of the cloth along the guide surface 61.

  In FIG. 15, the support base 2 is inclined so that its height decreases in the direction of the arrow q, that is, the direction orthogonal to the cloth feeding direction, as it proceeds from the presser 5 side to the inside of the sewing machine body 2. That is, the left end portion of the support base 2 is higher than the right end portion by the height h3. Therefore, in the support base 2, the position of the guide surface 61 of the stitch ruler 60 is lower than the position of the presser 5. Thus, the end surface of the cloth is easily guided by the guide surface 61.

  As shown in FIG. 16, the support base 2 is inclined so that its height decreases as it proceeds in the direction of the arrow p, that is, the cloth feeding direction. That is, the front end (right side) of the support base 2 is higher by the height h4 than the back end (left side). This facilitates the feeding of the cloth.

  Therefore, according to the embodiment shown in FIGS. 15 and 16, since the cloth can be fed easily, the upper and lower cloths can be moved together and the upper and lower cloths can be moved by hand when the stacked cloths are fed. It becomes easier to prevent the shift, which is more advantageous for preventing the sewing.

  In the above-described embodiment, the example in which the attachment 10 is attached to the knee lift lever 6 has been described. However, the attachment target of the attachment 10 is not limited to the knee lift lever. The attachment target of the attachment 10 may be a lever for raising the presser from the lower end position by a rotation operation. For example, there is a configuration in which the lever is rotated and the presser is raised as the pedal is stepped on and off. With this configuration, the attachment 10 can be attached to a lever that is rotated by a pedal.

  In the above embodiment, the example in which the attachment 10 is retrofitted to the sewing machine 1 has been described. However, an adjustment mechanism corresponding to the attachment 10 may be provided as an original component of the sewing machine itself. In the adjustment mechanism in this case, the attachment portion 13 shown in FIG. 4 is not necessarily required, and the attachment portion 13 and the support portion 14 shown in FIG. 4 may be formed integrally with the fixture 8 shown in FIG.

  As described above, the present invention can be used for sewing with a sewing machine, and is advantageous in preventing stitching.

DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Sewing machine main body 3 Support stand 5 Presser 6 Knee raising lever 10, 30 Attachment 11 Main body part 12 Movable part 13 Attachment part 14 Support part 31 Hand 32 Arm 53 Cloth 54 Small piece 55 Thin piece

Claims (16)

An attachment for a sewing machine used for a sewing machine capable of raising the work material presser from the lower end position by rotating the lever,
A main body, and a movable portion attached to the main body,
The main body is attached to the sewing machine so as to move integrally with the rotational movement of the lever.
The movable part is configured to bring the tip into contact with the sewing machine and stop the lever.
An attachment for a sewing machine, wherein the amount of extension of the movable part from the main body part is adjustable.   2. The attachment for a sewing machine is for adjusting the stationary position of the lever by adjusting the extension amount of the movable part and holding the presser in a position raised from the lower end position. Attachment for sewing machine described in 1.   In addition to the main body and the movable portion, the arm further includes an arm including a hand that holds a small piece of the processed material, and the arm moves the small piece held by the hand to a tip position of the movable portion. The attachment for sewing machines according to claim 1 or 2, wherein the attachment is for sewing machines.   The movable part is screwed into the main body when the movable part is attached to the main body, and the extension amount can be adjusted by rotating the movable part. The attachment for sewing machines as described in any of the above. A sewing machine capable of raising the work material presser from the lower end position by rotating the lever,
An adjustment mechanism for adjusting the stationary position of the lever;
The adjustment mechanism includes a main body part and a movable part attached to the main body part,
The main body moves integrally with the rotational movement of the lever,
The movable part is configured to bring the tip into contact with the sewing machine and stop the lever.
A sewing machine characterized in that the amount of extension of the movable part from the body part can be adjusted.   The adjustment mechanism is for adjusting the stationary position of the lever by adjusting the extension amount of the movable part and holding the presser in a position raised from the lower end position. The described sewing machine.   The arm according to claim 5 or 6, further comprising an arm including a hand that holds the small piece of the workpiece, wherein the arm moves the small piece held by the hand to a tip position of the movable portion. sewing machine.   The sewing machine according to claim 5, wherein the movable part is screwed to the main body part, and the movable part can be rotated to adjust the extension amount.   The apparatus further includes a support base that supports the main body of the sewing machine, and the height of the support base decreases in the direction orthogonal to the feed direction of the workpiece as it advances from the presser to the inside of the main body. The sewing machine according to any one of claims 5 to 8, which is inclined so as to become.   The support base which supports the main-body part of the said sewing machine is further provided, and the said support base inclines so that height may become low as it advances in the feed direction of the said workpiece. The described sewing machine. A sewing method using a sewing machine to which the attachment for sewing machine according to any one of claims 1 to 4 is attached,
Place the workpiece under the presser,
By adjusting the extension amount of the movable part, the stationary position of the lever is adjusted, the presser is held at a position raised from the lower end position, and the workpiece is sewn in the held state. Sewing method.   The sewing method according to claim 11, wherein a thin piece is sandwiched between the workpiece and the presser, and the extension amount of the movable portion is set according to a degree of extraction force of the thin piece.   When the work material is further overlapped and sewn on the work material, a small piece of the work material is sandwiched between the tip of the movable part and a part of the sewing machine, and the rest position of the lever is changed, The sewing method according to claim 11, wherein the presser is held at a position raised by the thickness of the small piece, and the workpiece is sewn in the holding state. A sewing method using the sewing machine according to any one of claims 5 to 10,
Place the workpiece under the presser,
By adjusting the extension amount of the movable part, the stationary position of the lever is adjusted, the presser is held at a position raised from the lower end position, and the workpiece is sewn in the held state. Sewing method.   The sewing method according to claim 14, wherein a thin piece is sandwiched between the workpiece and the presser, and the extension amount of the movable portion is set according to a degree of extraction force of the thin piece.   When the work material is further overlapped and sewn on the work material, a small piece of the work material is sandwiched between the tip of the movable part and a part of the sewing machine, and the rest position of the lever is changed, The sewing method according to claim 14, wherein the presser is held at a position raised by the thickness of the small piece, and the workpiece is sewn in the holding state.

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