JP6692152B2 - Sewing machine with cloth cutting knife - Google Patents

Description

  The present invention feeds the cloth to a needle drop position on the sewing machine bed in a state in which the cloth is folded back to the back side by a predetermined width, and one of the movable knife and the movable knife that emerges from the inside of the sewing machine bed to one side of the needle drop position front side. The present invention relates to a sewing machine with a cloth-cutting knife that cuts the edge of the cloth with a fixed knife that is in sliding contact with the surface of the cloth.

  For example, in the case of sewing a T-shirt or the like, when a tubular portion is provided around the waist or cuffs, the fabric is folded back to the back side by a predetermined width and fed to the needle drop position on the sewing machine bed so that the edge of the fabric is on the front surface of the fabric. Hem stitching to be sewn to the side is performed.

  In order to perform this hem sewing, the movable knife that moves up and down by the power transmitted from the sewing machine spindle to appear and disappear on the sewing machine bed, and the movable knife that contacts one surface of the movable knife and is slidable with respect to the movable knife. A fixed knife is provided on one side of the front portion of the needle drop position, and by these actions, the edge of the fabric that is folded back to the back side and fed to the needle drop position is cut leaving a predetermined folding width. A sewing machine with a cloth cutting knife is known (for example, see Patent Document 1).

  FIG. 7: is a figure which shows schematically the mode of hem sewing performed using such a sewing machine with a cloth cutting knife (three needles). In addition, in FIG. 7, the alternate long and short dash line indicates the needle drop positions of the three needles arranged side by side. The movable knife 42 is attached to a knife shaft (not shown) horizontally supported laterally inside the sewing machine bed. The movable knife 42 oscillates as shown by an arrow in FIG. 7 in response to repeated rotation of the knife shaft about its axis due to transmission from a sewing machine main shaft (not shown). The fixed knife 43 is fixedly supported by a knife table that also serves as a supporting member for the knife shaft. The fixed knife 43 is in contact with one surface of the movable knife 42, and the movable knife 42 slides with respect to the fixed knife 43 during the above swing. In this specification, such a contact state between the movable knife 42 and the fixed knife 43 is defined as "sliding contact".

  The movable knife 42 is provided with a hook-shaped curved tip portion, and the tip portion moves up and down during the above-mentioned swinging to project and retract on the sewing machine bed before the needle drop position. Then, as shown in FIG. 7, the edge E of the cloth W which is folded back to the back side and fed to the needle drop position is caught by the tip of the movable knife 42 which has moved upward, and the edge of the tip of the cloth moves downward. Be lowered. Then, the edge E of the cloth W is cut between the blade portion 42a of the movable knife 42 and the blade portion 43a of the fixed knife 43 that is in sliding contact with one surface of the blade portion 42a. Here, the cloth W folded back to the back side has a folded width determined by the position of sliding contact between the movable knife 42 and the fixed knife 43 (cutting position by the movable knife 42 and the fixed knife 43) in the direction orthogonal to the sewing direction. Cut at D.

Japanese Patent Laid-Open No. 2003-305287

  By the way, in the hem sewing by the sewing machine with a cloth cutting knife as described above, the folding width D of the cloth W is generally lowered to the needle drop position shown by the one-dot chain line as shown in FIG. 8A. The stitches by the needle are set so as to be formed within the folding width D. However, as shown in FIG. 8 (b), for the purpose of giving design characteristics to the seam with the diversification of the sewn products, or preventing the edge of the soft fabric from being broken. The hem stitching may be performed by setting the folding width D so that the outermost needle drop position (on the left side in FIG. 8B) is outside the folding width D.

  In order to deal with such hem sewing with various folding widths D, the cutting positions of the movable knife 42 and the fixed knife 43 are orthogonal to the sewing direction (see FIGS. 8A and 8B). It is necessary to move it to the left / right direction to change the position. Conventionally, this change is performed by releasing the fixation of the knife base of the fixed knife 43 which also serves as a support member of the movable knife 42 and manually changing the position of the knife base in the left and right directions of FIGS. 8A and 8B. Then I fixed it again. However, in this method, it is difficult to accurately position the cutting position by the movable knife 42 and the fixed knife 43, and the trial sewing is performed after changing the position of the knife table, and the cutting position is different from the target position. Repeats the work of changing the position of the knife table again until the desired folding width D is obtained.

  The present invention is a sewing machine with a cloth cutting knife that can solve the above-mentioned problems, and a sewing machine bed, a female shaft horizontally supported laterally inside the sewing machine bed, and rotating around an axis, A base fixed to the sewing machine bed, a pair of left side support brackets and right side support brackets provided in the base and having a through hole through which the female shaft is inserted, and a pair of left side support brackets attached to the left end of the female shaft. A movable knife that swings in response to repeated rotation of the knife shaft, a knife table that is supported by the left support bracket and that movably supports the knife shaft in its axial direction, and the knife table. Fixed knife which is attached to the right side of the movable knife and cuts the edge of the cloth fed onto the sewing machine bed, one end of the left supporting bracket and the right supporting bracket A transmission lever that is connected to the female shaft between and has the other end connected to the sewing machine spindle, reciprocally rotates at a predetermined angle about the axis according to the rotation of the sewing machine spindle, and swings the female shaft. In the sewing machine with a cloth cutting knife provided with, between the left side support bracket and the transmission lever, a coil spring which inserts the female shaft, and which is installed on the right side of the female shaft, is provided at the center of the female shaft. An adjusting mechanism for moving the knife shaft in the axial direction by changing the cutting position of the end edge by the fixed knife and the movable knife by applying a pressing force to the knife.

  Further, the sewing machine with a cloth cutting knife according to the present invention may further include a spring bearing ring mounted on the female shaft between the transmission lever and the coil spring.

  Further, in the sewing machine with a cloth cutting knife according to the present invention, the adjusting mechanism includes a screw hole provided in the female shaft, a screw with an operation dial screwed into the screw hole, and the female shaft of the screw with the operation dial. And a restricting portion that restricts the movement in the axial direction, and the female shaft may be moved in the axial direction by rotating the screw with the operation dial around the axis of the female shaft.

  Further, in the sewing machine with a cloth cutting knife according to the present invention, the adjusting mechanism is attached to the support bracket on the right side, and a support plate provided with a screw hole penetrating in the axial direction of the female shaft and the screw hole are provided. A screw with an operation dial that is screwed together and an end surface of which is in contact with the shaft center of the female shaft; and by rotating the screw with the operation dial around the shaft of the female shaft, the female shaft is axially moved. You may move it.

  Further, in the above configuration, a biasing member that biases the female shaft toward the screw with the operation dial with respect to the right side support bracket may be further provided.

  Further, in the above-mentioned configuration, in the vicinity of the right end surface of the female shaft, a protruding portion that protrudes outward from the side surface of the female shaft is provided, and the biasing member includes the protruding portion and the right side support bracket. The coil spring may be disposed between the coil spring and the coil spring, and the coil spring may bias the female shaft to the screw side with the operation dial via the protrusion.

  According to such a sewing machine with a cloth cutting knife, the cutting position by the fixed knife and the movable knife on the edge of the sewing material can be easily changed by the adjusting mechanism.

It is a perspective view of a sewing machine with a cloth cutting knife according to an embodiment of the present invention. It is a perspective view which shows the structure of a needle plate, a knife mechanism, and an adjustment mechanism. It is an exploded perspective view of a knife mechanism and an adjustment mechanism. It is a fragmentary sectional view showing a part of composition of a knife mechanism and an adjustment mechanism in a section. It is an exploded perspective view of other examples of a knife mechanism and an adjustment mechanism. It is a fragmentary sectional view showing a part of composition of other examples of a knife mechanism and an adjustment mechanism in a section. It is a figure which shows roughly the mode of hem sewing performed using the sewing machine with a cloth cutting knife. It is explanatory drawing of the folding back width in hem sewing.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a sewing machine 100 with a cloth cutting knife according to an embodiment of the present invention. As shown in FIG. 1, the sewing machine 100 with a cloth cutting knife includes a sewing machine arm A, a sewing machine bed B, and a standing body C. The standing body C is erected vertically upward on the upper surface of the sewing machine bed B, and the sewing machine arm A extends horizontally from the upper end of the standing body C. A needle bar extends vertically downward from the tip of the sewing machine arm A, and a plurality of needles 1 are attached to the lower end of the needle bar. A presser bar extends vertically downward from the tip of the sewing machine arm A, and a presser foot 2 is attached to the lower end of the presser bar. A needle plate 3 is installed on a portion of the sewing machine bed B facing the needle 1, and a lower portion of the needle plate 3 is provided with a looper and a feeding mechanism (not shown).

  The plurality of needles 1 move up and down with a predetermined stroke together with the needle bar by transmission from an unillustrated upper shaft built in the sewing machine arm A. Further, the presser foot 2 descends onto the needle plate 3 by a predetermined operation, and holds the material placed on the sewing machine bed B between the presser foot 2 and the needle plate 3.

  As shown in FIG. 1, a knife mechanism 4 is provided near the needle plate of the sewing machine bed B. Further, an adjusting mechanism 5 is provided closer to the vertical body portion side (right side) of the sewing machine bed B than the knife mechanism 4. The knife mechanism 4 and the adjusting mechanism 5 are covered with a front cover (not shown) when the sewing machine 100 with a cloth cutting knife is in use, and are not visible from the outside. FIG. 2 is a perspective view showing the configuration of the knife mechanism 4 together with the needle plate 3. Further, FIG. 3 is an exploded perspective view of the knife mechanism 4. FIG. 4 is a partial cross-sectional view showing a part of the configuration of the knife mechanism 4 and the adjusting mechanism 5 in cross section.

  As described above, the needle plate 3 is laid across the portion of the sewing machine bed B that faces the plurality of needles 1. The needle plate 3 has a plurality of needles that move up and down as described above in the approximate center. Plural (three in the figure) needle drop holes 30 for passing 1 when descending are provided side by side in the width direction. Further, a plurality of rectangular feed dog holes 31 for projecting feed dogs (not shown) are formed in front, rear, left and right of these needle drop holes 30. Further, a rectangular cutout 32 is formed on the front end side of the sewing machine bed B in the front part of the needle plate 3 (for example, on the left front side in FIG. 2). In this specification, the directions indicated by the words "front and rear" and "right and left" are the directions indicated by the double-headed arrow with the characters "front and rear" or "right and left" in FIG.

  When the sewing machine 100 with a cloth cutting knife is in use, the cloth is fed backward on the needle plate 3 (direction shown by arrow Y in FIG. 2). This cloth (not shown) is clamped between the needle plate 3 and the presser foot 2 (see FIG. 1), and a predetermined feed is performed by the operation of the feed dog (not shown) protruding from the feed dog hole 31 onto the needle plate 3. The quantity is sent in the direction indicated by arrow Y in FIG. Then, the fed material is sewn by the needle 1 descending into the needle drop hole 30 and the operation of a looper (not shown) arranged at the above position under the needle plate 3.

  As described above, the knife mechanism 4 is provided inside the front side of the sewing machine bed B, and includes the base 40, the knife shaft 41, the movable knife 42, and the fixed knife 43 slidably contacting the movable knife 42. Equipped with. The movable knife 42 is moved in the vertical direction by transmission from a sewing machine main shaft (not shown) and brought into sliding contact with the fixed knife 43 to cut the edge E of the cloth fed onto the needle plate 3.

  The base 40 is fixed to the front side of the sewing machine bed B with a plurality of screws. The base 40 is provided with a pair of support brackets 40a and 40b, and through holes through which the female shaft 41 is inserted are formed in the support brackets 40a and 40b, respectively. The female shaft 41 is inserted through the through holes formed in each of the pair of support brackets 40a and 40b through the support cylinder 44a and the support cylinder 40c, which will be described later, so that the female shaft 41 is positioned at the front side of the needle plate 3 and is It is bridged in a direction substantially orthogonal to the feeding direction of W.

  The movable knife 42 is attached to the knife shaft 41, and a blade portion 42a that is curved in a hook shape is provided at a tip end portion thereof. More specifically, of the pair of support brackets 40a, 40b provided on the base 40, the base of the movable knife 42 is fitted to the end of the female shaft 41 that protrudes further leftward from the left support bracket 40a. Therefore, the movable knife 42 is fixed to the knife shaft 41. Then, the movable knife 42 swings so that the blade portion 42a moves up and down in response to the repeated rotation of the knife shaft 41. The blade portion 42a at the tip of the oscillating movable knife 42 protrudes above the needle plate 3 from the cutout portion 32 of the needle plate 3 as shown in FIG.

  As shown in FIG. 3, the fixed knife 43 is a plate-shaped member in which a blade portion 43a is formed at one end in the longitudinal direction thereof, and as shown in FIG. 2, a knife supported by a base 40. It is attached to the base 44. The blade portion 43a of the fixed knife 43 is arranged along the edge of the cutout portion 32 of the needle plate 3 on the side of the vertical trunk portion (right side). Then, the blade portion 42a of the movable knife 42 swings up and down, and the blade portion 43a of the fixed knife 43 and the blade portion 42a of the movable knife 42 make sliding contact with each other, whereby the edge E of the cloth W is cut.

  As shown in FIG. 3, the knife base 44 is provided with a cylindrical support cylinder 44a formed so as to be rotatable around the knife shaft 41 when the knife shaft 41 is inserted therein. .. The support cylinder 44a is inserted into the through hole formed in the support bracket 40a of the base 40, and the bolt 48 is tightened to fix the female base 44 to the base 40. Further, as shown in FIG. 3, the through hole formed in the support bracket 40b of the base 40 is formed so as to be rotatable about the shaft when the female shaft 41 is inserted inside. A cylindrical support cylinder 40c is fitted. The female shaft 41 is rotatably laterally supported by the support brackets 40a and 40b of the base 40 via the support cylinder 44a and the support cylinder 40c.

  As shown in FIGS. 2 and 4, between the support brackets 40a and 40b, the transmission lever 6, the spring receiving ring 45, and the coil spring 46 are arranged in this order from the right side support bracket 40b side to the left side support bracket 40a side. Is attached to the female shaft 41. As shown in FIGS. 2 and 3, a long hole 60 is formed at the other end of the transmission lever 6 opposite to the one end attached to the female shaft 41. As shown in FIG. 2, the transmission lever 6 is connected to the link member 7 via a fixing bolt 61 inserted in the elongated hole 60. The transmission lever 6 is connected to a rotating shaft (not shown) via the link member 7. This rotating shaft is connected to a sewing machine main shaft (not shown) installed in the sewing machine bed B via a known eccentric drive mechanism, and repeatedly rotates at a predetermined angle around the shaft according to the rotation of the sewing machine main shaft ( Reciprocating rotation).

  With the above configuration, the rotation of the sewing machine main shaft in the sewing machine 100 with a cloth cutting knife is transmitted to the transmission lever 6 via the rotary shaft and the link member 7, and the transmission lever 6 swings. It is transmitted to the female shaft 41 to which the lever 6 is attached. Then, the movable knife 42 attached to the tip of the knife shaft 41 is swung. The swing amount of the movable knife 42 at this time can be adjusted by changing the fixing position of the fixing bolt 61 within the range of the length of the long hole 60 provided in the transmission lever 6.

  As shown in FIGS. 2 and 3, an annular spring bearing ring 45 is mounted on the female shaft 41 between the transmission lever 6 and the coil spring 46. The mounting position of the spring bearing ring 45 on the female shaft 41 is such that the distance between the end face of the support cylinder 44a inserted into the opposing left side support bracket 40a and the end face of the spring bearing ring 45 is the steady state of the coil spring 46. It is adjusted to a position shorter than the axial length.

  The coil spring 46 is inserted on the female shaft 41 between the left support bracket 40 a and the spring bearing ring 45. As shown in FIG. 4, the coil spring 46 is sandwiched between the support cylinder 44 a and the spring receiving ring 45. Since the distance between the support cylinder 44a and the spring receiving ring 45 is shorter than the axial length of the coil spring 46 in the steady state, the coil spring 46 is compressed more than in the steady state. Therefore, the coil spring 46 gives an elastic force to the female shaft 41 via the spring receiving ring 45. Due to this elastic force, the female shaft 41 is urged toward the vertical body portion side (rightward in FIG. 4). Therefore, the blade portion 42a of the movable knife 42 attached to the distal end portion of the knife shaft 41 is pressed against the blade portion 43a of the fixed knife 43, and in this state, slides against the blade portion 43a of the fixed knife 43. Move up and down. The fixed position of the spring bearing ring 45 can be adjusted in the axial direction of the female shaft 41 to adjust the elastic force of the coil spring 46.

  The adjusting mechanism 5A changes the cutting position of the edge (folding width D) of the cloth W by the fixed knife 43 and the movable knife 42 by applying a pressing force to the center of the knife shaft 41 along the axial direction thereof. 2 to 4, it has a screw 50 with an operation dial and a stopper 54.

  The screw 50 with an operation dial is provided on the right side of the female shaft, and has a screw portion 50a that is inserted into a screw hole 41a provided along the female shaft center line on the right end surface of the female shaft 41 and one end of the screw portion 50a. It is composed of a substantially disk-shaped operation dial portion 50b provided. The stopper 54 is a substantially L-shaped metal plate, and as shown in FIG. 4, is fixed to the support bracket 40b of the base 40 with bolts 49 and is in contact with the operation dial portion 50b from the right side. ..

  As shown in FIG. 4, the operation dial portion 50b is sandwiched between the support cylinder 40c fitted to the support bracket 40b of the base 40 and the stopper 54. As a result, the movement of the screw 50 with the operation dial in the axial direction of the female shaft 41 is restricted. Therefore, when the operation dial portion 50b of the operation dial-equipped screw 50 is turned, not the operation dial-equipped screw 50 but the female shaft 41 is moved in the axial direction, and accordingly, the fixed knife 43 and the movable knife 42 also move to the female shaft 41. Move in the axial direction. Thereby, the cutting position by the fixed knife 43 and the movable knife 42 can be changed. The support cylinder 40c and the stopper 54 of the base 40 are an example of a restriction portion that restricts the movement of the operation dial screw 50 in the axial direction of the female shaft 41.

  By the way, for example, when the force point of the force for moving the female shaft 41 exists at a position not on the axis of the female shaft 41, the resistance with other members sliding on the female shaft 41 is increased. There is a possibility that a moving moment may act. However, in the adjusting mechanism 5A included in the sewing machine 100 with a cloth cutting knife according to the present embodiment, the knife shaft 41 to be moved and the operation dial screw 50 that applies a force for moving the knife shaft 41 are coaxial with each other. Since they are arranged, not only the direction of the force and the axial direction of the female shaft 41 completely coincide, but also the force point and the action point of the force exist on the axis of the female shaft 41. Therefore, the cutting position can be changed by smoothly moving the female shaft 41 without generating a moment or the like that increases resistance with other members sliding on the female shaft 41.

  Next, another adjusting mechanism 5B, which replaces the above-described adjusting mechanism 5A, included in the sewing machine with a cloth cutting knife 100 according to the present embodiment will be described. FIG. 5 is an exploded perspective view showing a part of the adjusting mechanism 5B and the female mechanism 4 which are examples of another adjusting mechanism in a cross section. Further, FIG. 6 is a partial cross-sectional view showing a part of the configuration of another example of the knife mechanism 4 and the adjusting mechanism 5B in cross section. Note that, in the following description, the description of the knife mechanism 4 that is the same as that of the knife mechanism 4 described with reference to FIGS. 1 to 4 will be omitted.

  Like the adjusting mechanism 5A, the adjusting mechanism 5B applies a pressing force to the center of the knife shaft 41 in a direction along the axial direction of the knife shaft 41 so that the fixed knife 43 and the movable knife 42 form an edge of the cloth W (folding width D ) Is provided for changing the cutting position, and as shown in FIGS. 5 and 6, it has an operation dial screw 51 and support plates 55 and 56.

  The screw 51 with an operation dial is provided on the right side of the female shaft, and has a threaded portion 51a whose one end surface is in contact with a positioning recess 41b provided on the female shaft center line at the right end surface of the female shaft 41, and a threaded portion 51a. And a substantially disk-shaped operation dial portion 51b provided at the other end of the. The support plate 55 is a substantially L-shaped metal plate, and is fixed to the support bracket 40b of the base 40 with bolts 49, as shown in FIG. Further, the support plate 55 is provided with a threaded hole so that the center line of the female shaft coincides with the axis of the hole, and the threaded portion 51a of the screw 51 with the operation dial is inserted into the threaded hole.

  Further, as shown in FIGS. 5 and 6, a C ring 58 is attached to the right end of the female shaft 41 so as to project radially from the side surface of the female shaft 41. The C-ring 58 is an example of a protruding portion in the present invention, but when one end of a coil spring 59 described later is brought into contact with the C-ring 58, the urging force (elastic force) from the coil spring 59 is transmitted to the female shaft 41 as it is. The configuration is not limited to this as long as the configuration can be performed.

  The coil spring 59, which is a biasing member, is arranged on the outer circumference of the female shaft 41 between the C ring 58 and the support bracket 40b of the base 40. Then, as shown in FIG. 6, one end of the coil spring 59 is in contact with the right end surface of the support cylinder 40c fitted in the support bracket 40b, and the other end is in contact with the left end surface of the C ring 58. ing. The mounting position of the C ring 58 in the female axial direction is set so that the distance between the right end surface of the support cylinder 40c and the C ring 58 is always shorter than the steady-state axial length of the coil spring 59.

  That is, even when the operation dial screw 51 and the female shaft 41 are moved to the rightmost side by the operation of the operation dial portion 51b, the distance between the right end surface of the support cylinder 40c and the C ring 58 is the axial direction of the coil spring 59 in the steady state. Less than length. Therefore, the coil spring 59 is always compressed regardless of the position of the female shaft 41, and applies the elastic force to the right of the sewing machine bed B to the female shaft 41 via the C ring 58. The elastic force urges the female shaft 41 toward the right side of the sewing machine bed B, that is, toward the operation dial screw 51 side. Therefore, regardless of the position of the screw 51 with the operation dial, the positioning recess 41b of the female shaft 41 is always kept in contact with the left end surface of the screw portion 51a.

  With the above configuration, the adjusting mechanism 5B can move the female shaft 41 as follows by operating the operation dial portion 51b of the operation dial-attached screw 51. That is, when the operation dial portion 51b is rotated to move the operation dial screw 51 to the left, the female shaft 41 is pushed by the screw portion 51a of the operation dial screw 51 and resists the elastic force of the coil spring 59. Move to the left. When the operation dial portion 51b is turned to move the operation dial-equipped screw 51 to the right, the female shaft 41 moves to the right following the operation dial-equipped screw 51 by the elastic force of the coil spring 59.

  In this manner, the adjusting mechanism 5B, like the adjusting mechanism 5A, applies a pressing force in the direction along the axial direction to the center of the female shaft 41 so that the dough W is formed by the fixed knife 43 and the movable knife 42. Since the cutting position of the edge (folding width D) of the female shaft 41 is changed, the female shaft 41 can be smoothly moved without generating a moment or the like that increases resistance with other members on which the female shaft 41 is sliding. The cutting position can be changed by moving the cutting position.

1 ... Needle 2 ... Presser foot 3 ... Needle plate 4 ... Knife mechanism 5 ... Adjusting mechanism 6 ... Transmission lever 7 ... Link member 40 ... Base 40a ... Left support bracket 40b ... Right support bracket 41 ... Female shaft 41a ... Screw Hole 44 ... Female base 45 ... Spring receiving ring 50 ... Operation dial screw 54 ... Stopper (restriction part)
55 ... Support plate 58 ... Projection (C ring)
59 ... Coil spring A ... Sewing machine arm B ... Sewing machine bed C ... Standing body

Claims (6)

Sewing machine bed,
A female shaft that is laterally supported in the left-right direction inside the sewing machine bed and that rotates around an axis,
A base fixed to the sewing machine bed,
A pair of left side support brackets and right side support brackets provided on the base, and having a through hole through which the female shaft is inserted,
A movable knife attached to the left end of the female shaft and swingable in response to repeated rotation of the female shaft,
A knife base that is supported between the left side support bracket and the movable knife, and supports the knife shaft so as to be movable in its axial direction,
A fixed knife that is attached to the knife table, is in sliding contact with the right surface of the movable knife, and cuts the edge of the cloth fed onto the sewing machine bed,
One end is connected to the female shaft between the left side support bracket and the right side support bracket, the other end is connected to the sewing machine spindle, and reciprocates at a predetermined angle around the axis according to the rotation of the sewing machine spindle. In a sewing machine with a cloth-cutting knife, which is provided with a transmission lever that rotates and swings the knife shaft,
Between the left side support bracket and the transmission lever, a coil spring that inserts the female shaft,
It is installed on the right side of the knife shaft and moves the knife shaft in the axial direction by applying a pressing force to the shaft center of the knife shaft, and the cutting position of the edge by the fixed knife and the movable knife. Adjustment mechanism to change the
A sewing machine with a cloth-cutting knife, characterized in that   The sewing machine with a cloth cutting knife according to claim 1, further comprising a spring receiving ring mounted on the female shaft between the transmission lever and the coil spring. The adjustment mechanism is
A screw hole provided on the female shaft, and a screw with an operation dial screwed into the screw hole;
A restricting portion that restricts movement of the screw with the operation dial in the axial direction of the female shaft,
The sewing machine with a cloth cutting knife according to claim 1 or 2, wherein the knife shaft is moved in the axial direction by rotating the screw with the operation dial around the knife shaft. The adjustment mechanism is
A support plate attached to the support bracket on the right side, provided with a screw hole penetrating in the axial direction of the female shaft;
A screw with an operation dial, which is screwed into the screw hole and whose end face abuts the shaft center of the female shaft,
Equipped with
The sewing machine with a cloth cutting knife according to claim 1 or 2, wherein the knife shaft is moved in the axial direction by rotating the screw with the operation dial around the knife shaft.   The sewing machine with a cloth cutting knife according to claim 4, further comprising a biasing member that biases the female shaft toward the operation dial-equipped screw side with respect to the right side support bracket. In the vicinity of the right end surface of the female shaft, a protruding portion that protrudes outward from the side surface of the female shaft is provided.
The biasing member is a coil spring arranged between the projecting portion and the right side support bracket, and the coil spring biases the female shaft toward the operation dial screw side via the projecting portion. The sewing machine with a cloth cutting knife according to claim 5.

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