JP2018187162A - sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine capable of removing curls surely.SOLUTION: A sewing machine includes: a lower support part for supporting cloths Fi, Fo from below; a cloth presser for pressing the cloths Fi, Fo from above, at an upper part of the lower support part; and a curl removing mechanism 4 provided in front of the cloth presser, and for stretching a curl C generating at an end edge Fe of the cloths Fi, Fo on the lower support part. The curl removing mechanism 4 has an air jetting part 43 which generates an airflow heading in parallel or in a direction being separated with respect to a virtual plane which is a flat surface in which a portion which is not curled in the cloths Fi, Fo is extended further outward from the end edge Fe.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a sewing machine having a curl removing mechanism for extending curl generated at an edge of a cloth.

  The curl with rounded edges in the fabric was a hindrance when sewing with a sewing machine. In a conventional sewing machine, there is a mechanism for taking up the curl of the fabric by blowing air. As shown in Patent Document 1, this mechanism can remove curl by causing an air current to be ejected from a pipe and the air current to spread the dough.

Japanese Utility Model Publication No. 50-2561

  However, this mechanism can effectively remove curls bent toward the side facing the airflow, but for example, curls bent in the opposite direction to the airflow will be spread even if the curl is pushed by the airflow. It is difficult to remove curl.

  In view of the above problems, an object of the present invention is to provide a sewing machine that can reliably remove curl.

  The present invention provides a lower support portion that supports the fabric from below, a fabric presser that presses the fabric from above above the lower support portion, and a fabric on the lower support portion that is provided in front of the fabric presser. A curl removal mechanism for extending curl generated at the edge of the fabric, the curl removal mechanism with respect to a virtual surface that is a plane obtained by extending an uncurled portion of the fabric outward from the edge. And a sewing machine having an air ejection portion for generating an air flow in a parallel or away direction.

  According to this structure, the negative pressure which faces cloth | dough (curl) can be produced with the airflow which goes to the direction which is parallel or away from a virtual surface from an air ejection part. This negative pressure can be removed by pulling the curl.

  And the said air ejection part has the air ejection hole which forms the said airflow by ejecting air, and the said curl removal mechanism has left | separated from the said cloth | dough of the said air ejection part to the normal line direction of the said virtual surface And a slope closer to the imaginary plane as it goes in the downstream direction at a position downstream of the air jetting hole than the air ejection hole.

  According to this configuration, the airflow after exiting from the air ejection hole of the air ejection section is redirected by the slope so as to approach the virtual plane. For this reason, compared with the structure in which the slope is not formed, the negative pressure can be formed at a position close to the fabric (curl), so that effective curl removal can be achieved by the synergistic effect of the air ejection portion and the slope.

  And the said air ejection part shall be located below rather than the said dough.

  According to this configuration, since the air ejection portion is positioned below the fabric, a negative pressure can be generated in a closed region sandwiched between the fabric and the lower support portion. For this reason, a negative pressure can be made to act effectively for curl removal.

  And the said curl removal mechanism can further have an upper air ejection part which produces the airflow which goes to the direction which approaches the said virtual surface above the said cloth | dough.

  According to this configuration, the curl can be stretched by directly applying an air flow to the fabric in the upper part, and the curl can be stretched by pulling the fabric by negative pressure in the lower part. For this reason, it is particularly effective for removing curls that warp upward.

  And the edge guide part contact | abutted to the said edge in a cloth | dough is further provided, and it can have a clearance gap through which the said airflow passes between the said lower support part and the lower end edge of the said edge guide part.

  According to this configuration, the airflow from the air ejection part flows downstream through the gap. For this reason, it is difficult for adverse effects such as flapping of the fabric to occur due to disturbance of the airflow due to dead ends.

  According to the present invention, the generated negative pressure can be removed by pulling the curl. Therefore, it is possible to provide a sewing machine that can remove the curl more reliably.

It is a perspective view which shows the sewing machine of this embodiment. It is a principal part expansion perspective view at the time of seeing the sewing machine of this embodiment from the left front side. It is a principal part expansion perspective view at the time of seeing the sewing machine of this embodiment from the right front side. It is a perspective schematic diagram showing a state where a curl removal mechanism and an edge guide part in the sewing machine of the present embodiment are extracted and the curl is extended by a cloth pinching part. It is explanatory drawing which shows the airflow from a lower air ejection part among the curl removal mechanisms in the sewing machine of this embodiment.

  Next, the present invention will be described by taking an embodiment. Regarding the expression in the front-rear direction, the side closer to the operator who performs sewing is referred to as “front side” and the side farther from is referred to as “rear side (rear side)”. In addition, the vertical and horizontal expressions are expressed in the direction when the sewing machine 1 is viewed from the operator.

  The sewing machine 1 of the present embodiment can be used as a “sleeve sewing machine”. For example, an operation of sewing a cylindrical sleeve portion on an arm through hole in a cylindrical body (for example, a T-shirt) This is an overlock sewing machine used for joining cylindrical fabrics, such as a sleeve attaching operation. Note that the T-shirt sleeve attaching operation is merely an example, and the sewing machine 1 of the present embodiment can be widely used in an operation of sewing the ring-shaped end edges of two fabrics. Further, as the tubular fabric, a fabric formed by circular knitting so that there is no circumferential seam (side seam) can be used. However, the sewing machine 1 of the present embodiment can also be used for flat fabrics that are not cylindrical. Moreover, it can be used for one piece of fabric or two or more stacked fabrics.

  As shown in FIG. 1, this sewing machine 1 is a state in which two fabrics Fi and Fo (shown by broken lines) having ring-shaped edges are overlapped on the inside and outside so that one is on the inner ring side and the other is on the outer ring side. Sewing with. The two fabrics Fi and Fo in the present embodiment are, for example, a body fabric and a sleeve fabric in a T-shirt, and are separate and independent (not connected) fabrics.

  The sewing machine 1 of the present embodiment includes a sewing machine body 2, a cylinder part 3 protruding from the sewing machine body 2 to one side (specifically, the left side), a curl removal mechanism 4, an edge guide part 5, and a cloth cutting mechanism 6. Yes. Note that a mechanism common to a general sewing machine will not be described in detail unless particularly required.

  The cylinder portion 3 is a portion that is inserted through the two fabrics Fi and Fo on the inner ring side and the outer ring side in an overlapped state, and is supported from below. Since the cylinder portion 3 can insert the two fabrics Fi and Fo, unlike the conventional sewing machine, the ring-shaped end edges of the fabrics Fi and Fo can be sewed with the needle plate 12 as a reference.

  As shown in FIG. 2, the cylinder portion 3 of the present embodiment is free to rotate with respect to a cylinder main body 31 protruding leftward from the sewing machine main body 2 and a rotation shaft protruding leftward from the cylinder main body 31 and extending in the left-right direction. The roller part 32 made possible is provided. The needle plate 12 is provided on the upper surface of the cylinder body 31. The roller 32 rotates as the two fabrics Fi and Fo are fed backward in the feeding direction M (see FIG. 1). For this reason, the two fabrics Fi and Fo can be smoothly fed rearward from the front side above the cylinder portion 3.

  As shown in FIG. 2, the sewing machine 1 of the present embodiment includes a needle 11 that reciprocates during sewing, a needle plate 12 that receives the reciprocating needle 11, a fabric presser 13, and each unit that is not shown. A drive mechanism, a conduction mechanism, and the like are provided. The needle plate 12 is provided on the upper surface of the cylinder body 31 of the cylinder portion 3 and has a needle hole (not shown) that can receive the reciprocating needle 11. The throat plate 12 abuts on the inner ring side fabric Fi that is supported by the cylinder portion 3 and supports it from below. Although not clearly shown in the drawing, the needle plate 12 has a feed mechanism 121 for feeding the fabric Fi on the inner ring side backward. The fabric presser 13 presses the fabric Fo on the outer ring side that is supported by the cylinder portion 3 above the needle plate 12. Since the two fabrics Fi and Fo on the inner ring side and the outer ring side are sandwiched between the needle plate 12 and the fabric presser 13, both are fed backward by the feed mechanism 121 during sewing.

  The curl removal mechanism 4 is a mechanism that is provided in front of the fabric presser 13 and extends the curl C generated at the edge Fe on the side where the sewing is performed in the two fabrics Fi and Fo on the inner ring side and the outer ring side. The curl C that can be extended by the curl removing mechanism 4 is a portion in which the vicinity of the edge Fe on the side where the sewing is performed is rounded along the edge of each of the fabrics Fi and Fo (see FIG. 4, FIG. 4). In the figure, each of the fabrics Fi and Fo shows a curl C that is rounded upward). In particular, curls C tend to occur when the fabrics Fi and Fo are stretched in the front-rear direction.

  As shown in FIG. 3, the curl removal mechanism 4 of the present embodiment includes a dough pinching portion 41, an upper air ejection portion 42, and a lower air ejection portion 43. The upper air ejection part 42 is located above the fabrics Fi and Fo, and the lower air ejection part 43 is located below the fabrics Fi and Fo. The cloth pinching portion 41 is provided in front of the needle plate 12 and the cloth presser 13. The fabric sandwiching portion 41 sandwiches the two fabrics Fi and Fo from above and below, with the fabrics on the inner ring side facing down and the fabrics Fo on the outer ring side facing up. For this reason, the cloth pinching portion 41 includes an upper cloth pinching portion 411 located above and a lower cloth pinching portion 412 located below. The upper dough sandwiching portion 411 is in a block shape and is provided with an upper air ejection portion 42 to be described later. Further, the dough sandwiching portion 41 includes a moving fulcrum portion 413, an urging portion 414, and an interval regulating portion 415. The portions facing the fabrics Fi and Fo in each of the upper fabric sandwiching portion 411 and the lower fabric sandwiching portion 412 are flat.

  A lower support portion that supports each of the fabrics Fi and Fo from below is constituted by the upper surface portion 4121 having the surface facing upward in the lower fabric sandwiching portion 412 and the needle plate 12. The lower support portion is a concept that includes the needle plate 12 and its peripheral portion. The fabric presser 13 presses the fabrics Fi and Fo above the lower support portion. The curl removing mechanism 4 is a mechanism for extending the curl C generated at the edge Fe of each of the fabrics Fi and Fo on the lower support portion.

  The lower fabric pinching portion 412 is an immovable member fixed to the front side of the needle plate 12. The lower fabric sandwiching portion 412 includes an upper surface portion 4121 and a groove portion 4122 on the upper side. The lower air ejection part 43 made of a pipe-like body is disposed in the groove part 4122. The lower fabric sandwiching portion 412 has a shape curved from the front side edge of the upper surface portion 4121 and directed downward. The upper surface portion 4121 has a flat portion at least facing the upper fabric clamping portion 411. The groove portion 4122 is formed so as to extend in the front-rear direction so that the lower air ejection portion 43 fits in the internal space. In the present embodiment, the upper surface portion 4121 and the upper end of the lower air ejection portion 43 are located at the same height (see FIG. 5). For this reason, compared with the case where the lower air ejection part 43 protrudes or is recessed from the upper surface part 4121, the fabrics Fi and Fo are less likely to be caught on the lower air ejection part 43. The bottom surface of the groove 4122 is a slope 4123 that rises to the right. The operation of the slope 4123 will be described later.

  The distance in the vertical direction between the upper fabric sandwiching portion 411 and the lower fabric sandwiching portion 412 is variable by the moving mechanism. In this embodiment, the moving mechanism is a mechanism that allows the upper fabric pinching portion 411 to rotate within a predetermined range around the moving fulcrum portion 413 with respect to the lower fabric pinching portion 412 that is stationary. For this reason, the upper side cloth pinching portion 411 can move up and down. In this embodiment, a screw is used as the movement fulcrum part 413, but the configuration is not limited as long as it can support the movement with respect to the lower cloth pinching part 412 of the upper cloth pinching part 411. This moving mechanism includes an operation unit (not shown). When the two fabrics Fi and Fo are to be sandwiched between both fabric sandwiching portions 411 and 412, the operator operates the operation unit to sandwich both fabrics. The portions 411 and 412 can be moved up and down. In the present embodiment, the upper fabric sandwiching portion 411 is configured to rotate with respect to the lower fabric sandwiching portion 412. For example, the upper fabric sandwiching portion 411 and the lower fabric sandwiching portion 412 are kept parallel. It may be configured to move in the vertical direction in the above state. Further, only the lower fabric pinching portion 412 may be moved, or both the upper fabric pinching portion 411 and the lower fabric pinching portion 412 may be moved.

  The urging portion 414 is a coil spring provided around a screw that is the movement fulcrum portion 413 in the present embodiment, and the upper fabric clamping portion 411 and the lower fabric clamping portion 412 are attached to the urging portion 414. The interval is maintained by the force. For this reason, when a portion having a large thickness due to, for example, a tape being attached to each fabric Fi, Fo, such as a sleeve portion of a T-shirt, passes through the fabric sandwiching portion 41, the upper fabric When the clip portion 411 moves upward, the distance between the upper fabric clip portion 411 and the lower fabric clip portion 412 increases, and after passing through the portion, the biased portion 414 automatically urges the original interval. Return. For this reason, even if there is a portion where the thickness is large in each of the fabrics Fi and Fo, the change in thickness can be satisfactorily followed, so that there is no problem in sewing. The interval between the upper fabric clamping portion 411 and the lower fabric clamping portion 412 can be adjusted by a bolt provided in the interval regulating unit 415.

  The cloth pinching portion 41 can feed the cloth between the needle plate 12 and the cloth presser 13 with the two cloth Fi and Fo sandwiched therebetween. For this reason, stable sewing is possible.

  In addition, a space for sandwiching the two fabrics Fi and Fo is only provided between the upper fabric sandwiching portion 411 and the lower fabric sandwiching portion 412, for example, for separating the two fabrics Fi and Fo. No plate-like separator is present. For this reason, it is not necessary to retract the separator or the like until the fabrics Fi and Fo fed rearward reach the needle holes in the needle plate 12, so that it is not necessary to reduce the sewing speed or temporarily stop the sewing work. It is advantageous for mass production of goods.

  As shown in FIG. 3, the upper fabric pinching portion 411 further has an edge from the edge Fe at the position where the end edge (the right end edge in this embodiment) Fe on the side where sewing is performed on the two fabrics Fi and Fo. Further, it has an inclined portion 4111 that recedes from the far side (left side in the present embodiment) toward the edge Fe side (right side in the present embodiment).

  The inclined portion 4111 of the present embodiment is from the body side (the left side in the present embodiment) at the position where the end edge (the right end edge in the present embodiment) Fe on the side where sewing is performed on the two fabrics Fi and Fo. The shape retreats toward the sleeve tip side (right side in the present embodiment). The “retracting shape” is a shape in which the edge 4111a of the inclined portion 4111 appears as a “upward line” when the dough sandwiching portion 41 is viewed from above. The edge 4111a has a linear shape. However, the present invention is not limited to this. For example, the shape of the edge 4111a can be a curved line.

  The upper air ejection part 42 is provided to open to the inclined part 4111 of the upper fabric clamping part 411, and a plurality of air ejection holes (in the present embodiment, there are five round holes, but the shape and quantity are not particularly limited). 421. In the present embodiment, the upper air ejection part 42 is provided at a position one step deeper from the inclined part 4111, but it can also be provided on the same plane as the inclined part 4111. By supplying the compressed air from the air pipe 44 connected to the upper fabric pinching portion 411, an air flow can be ejected from the air ejection hole 421. The jet direction of the airflow from the air jet hole 421 is obliquely downward. For this reason, an air current can be directly applied to the cloth Fo on the outer ring side.

  The lower air ejection portion 43 is a pipe-like body provided in the groove portion 4122 of the lower fabric sandwiching portion 412. In the present embodiment, as shown in FIG. 5, the lower air ejection portion 43 is in contact with the slope 4123 and the left side surface 4124 of the groove 4122. The lower air ejection part 43 is closed at the front end (rear end) and has a plurality of air ejection holes 431 on the side. In the embodiment, four air ejection holes 431 are formed on the right side. However, the shape and quantity of the air ejection holes 431 are not particularly limited. When compressed air is supplied from an air pipe (not shown) connected to the lower fabric pinching portion 412, the air is blown out from the air blowing holes 431, thereby causing an air flow F <b> 43 toward the side of the lower air blowing portion 43. Can be formed. In FIG. 5, for the sake of explanation, only the air flow F43 of the lower air ejection part 43 is indicated by an arrow. However, when the curl removal mechanism 4 is actually used, the air ejection hole 421 of the upper air ejection part 42 is used. The airflow is also formed from above and passes above the fabrics Fi and Fo.

  Here, the imaginary plane X (FIG. 5) is a plane in which the lower surface of the uncurled portion of each fabric Fi, Fo is extended outward from the edge Fe on the side where sewing is performed on each fabric Fi, Fo. Figure 2 shows the two-dot chain line). The lower air ejection part 43 is parallel to or away from the virtual plane X immediately after ejecting from the air ejection hole 431 (disposed downward in the lower air ejection part 43 as in the present embodiment). It is comprised so that the airflow F43 which goes to may be generated. The air flow F43 in the present embodiment is an air flow parallel to the upper surface portion 4121 (the upper surface coincides with the virtual surface X) of the lower fabric pinching portion 412.

  Thus, the airflow F43 heading in a direction parallel to or away from the virtual plane X from the lower air ejection portion 43 makes it difficult for the airflow to directly hit the fabrics Fi and Fo. On the other hand, a negative pressure facing each of the fabrics Fi and Fo (specifically, the curl C generated in each of the fabrics Fi and Fo), that is, a region where the pressure is lower than the surrounding region surrounding the air flow F43 is generated. Can do. Although the mechanism of the negative pressure generation in this embodiment is not completely clear, it is assumed that the high-speed airflow F43 ejected from the air ejection hole 431 generates a negative pressure. The negative pressure generated in this way pulls (or pulls) the curl C, so that each fabric Fi, Fo, particularly the lower air ejection portion 43 of the inner ring side that contacts the lower fabric sandwiching portion 412 is contacted. The curl C in the fabric Fi is extended so that the curl C is removed.

  As described above, the lower air ejection portion 43 is in contact with the slope 4123 and the left side surface 4124 of the groove portion 4122. In other words, the decurling mechanism 4 is a position (in the present embodiment, a lower position) that is away from the fabrics Fi and Fo of the lower air ejection portion 43 in the normal direction of the virtual plane X, and more than the air ejection hole 431. In the downstream position (right position in this embodiment) of the air flow F43, there is an inclined surface 4123 that approaches the virtual plane X in the downstream direction. For this reason, as shown in FIG. 5, the direction of the airflow F <b> 43 after exiting from the air ejection hole 431 is changed so as to approach the virtual plane X by the slope 4123. For this reason, compared with the configuration in which the slope 4123 is not formed, a negative pressure can be formed at a position close to each of the fabrics Fi and Fo (curl C), so that a synergistic effect between the lower air ejection portion 43 and the slope 4123 is achieved. Effective curl removal is possible.

  Moreover, the lower air ejection part 43 is located below the fabrics Fi and Fo. Thereby, a negative pressure is generated in a closed region (or space) sandwiched between the fabric Fi on the inner ring side and the lower fabric sandwiching portion 412 which is a part of the lower support portion. For this reason, the generated negative pressure can be effectively removed for curling.

  Then, the upper air ejection part 42 generates an airflow that is directed obliquely downward, that is, in a direction approaching the virtual plane X, above each of the fabrics Fi and Fo. For this reason, with respect to each of the fabrics Fi and Fo located on the upper surface portion 4121 of the lower fabric sandwiching portion 412, the upper side is curled by directly applying an air current to the fabric Fo on the outer ring side positioned on the upper side in an overlapped state. C can be extended. On the other hand, at the lower side, the curl C can be extended by pulling (or pulling) the fabric Fi on the inner ring side positioned below in an overlapped state with a negative pressure. In this way, different forces can be exerted on the curl C above and below each of the fabrics Fi and Fo, such as “pushing” directly by the airflow at the top and “pull” by the negative pressure at the bottom. Therefore, the curl removing mechanism 4 of the present embodiment is particularly effective for removing the curl C that has warped upward.

  The two fabrics Fi and Fo are moved backward in the feeding direction M while being sandwiched between the upper fabric sandwiching portion 411 and the lower fabric sandwiching portion 412. Therefore, as shown in FIG. 4, the curl C generated on the edge (right end edge) Fe on the side where the sewing is performed on the two fabrics Fi and Fo is sandwiched between the inclined portion 4111 and the lower fabric sandwiching portion 411. By being sandwiched between the upper surface portion 4121 of the portion 412, it is pushed rightward and is in a flat state that is opposed in accordance with the distance between the upper fabric sandwiching portion 411 and the lower fabric sandwiching portion 412. In this way, the curl C is effectively removed.

  Furthermore, since the portion of the fabrics Fi and Fo where the curl C is generated can be moved to the right by the pressure of the airflow ejected from the upper air ejection portion 42, the curl C can be extended. As described above, in this embodiment, the curl C can be extended by both the inclined portion 4111 and the air flow ejected from the upper air ejection portion 42. For this reason, the curl C is effectively removed.

  In addition, unlike the upper air ejection portion 42, the lower air ejection portion 43 can remove the curl C by the negative pressure generated by the air flow formed by the air ejected from the air ejection hole 431. In this way, the curl C is removed more effectively by the combination of the upper air ejection part 42 and the lower air ejection part 43, which have different actions of the airflow.

  As shown in FIGS. 1 and 2, the edge guide portion 5 is located in front of the curl removal mechanism 4. The edge guide portion 5 has a flat plate portion 51 and a fixed piece 52. The flat plate portion 51 is disposed along the front-rear direction so as to protrude from the surface of the lower fabric sandwiching portion 412 and abuts against the edges of the two fabrics Fi and Fo on the inner ring side and the outer ring side. Thereby, positioning of the two fabrics Fi and Fo before sewing can be performed. In the present embodiment, since the edge of the lower fabric sandwiching portion 412 in the flat plate portion 51 is open, for example, a tape is affixed to each fabric Fi, Fo, such as a sleeve portion of a T-shirt, etc. Even if there is a portion having a greater thickness, the feeding of the fabrics Fi and Fo will not be delayed because the portion runs above the flat plate portion 51. The fixed piece 52 is fixed to the lower fabric pinching portion 412 with screws 53. The edge guide portion 5 can be moved in the left-right direction with respect to the lower fabric clamping portion 412 by loosening the screws 53. However, it is not limited to this, The edge guide part 5 can also be made into a fixed type.

  In particular, in the present embodiment, the flat plate portion 51 is positioned along the upper side and the near side of the groove portion 4122 formed in the lower fabric pinching portion 412. Therefore, the upper region of the groove 4122 is divided into left and right by the flat plate portion 51 in plan view. For this reason, the airflow ejected from the lower air ejection part 43 flows from the left side to the right side of the flat plate part 51 as viewed from the front side, and is released into the atmosphere from the right side of the flat plate part 51.

  There is a gap S through which the airflow passes between the lower cloth pinching portion 412 and the lower edge 511 of the flat plate portion 51 in the edge guide portion 5. Specifically, in the present embodiment, a gap S is formed between the slope 4123 in the lower fabric sandwiching portion 412 and the lower end edge of the edge guide portion 5. The airflow from the lower air ejection part 43 flows through the gap S and flows downstream. For this reason, it is hard to produce bad influences, such as fluttering of the fabrics Fi and Fo caused by the turbulence of the airflow, which occurs when the edge guide portion 5 blocks the airflow and the flow path becomes dead end. Although not shown, since the fabrics Fi and Fo are flexible, part of the airflow from the air ejection holes 421 of the upper air ejection part 42 also flows from the left to the right through the gap S. It is possible.

  As shown in FIG. 2, the dough cutting mechanism 6 includes a knife part 61. The knife 61 is a known mechanism, and is configured to cut a predetermined range from the edges of the two fabrics Fi and Fo by reciprocating the blade at the tip, and from the edge guide 5 Is also located behind. The knife 61 cuts the two fabrics Fi and Fo at a position away from the end edge guide 5 by a predetermined distance in the rear in the feed direction M.

  As described above, the edge guide portion 5 of the present embodiment can be moved in the left-right direction by loosening the screw 53 that fixes the fixing piece 52 to the lower fabric clamping portion 412. Thereby, the edge guide part 5 and the knife part 61 of the cloth cutting mechanism 6 can be adjusted to each other so that the predetermined distance can be changed. By adjusting the position of the edge guide part 5 and the knife part 61 with respect to each other, the amount of cut width of the two fabrics Fi and Fo on the inner ring side and the outer ring side by the knife part 61 can be arbitrarily set. For this reason, since the two fabrics Fi and Fo cut at a constant width can be sewn, a desired sewing product can be produced stably and efficiently.

  The edge guide portion 5 and the cloth cutting mechanism 6 automatically cut the predetermined range from the edge after aligning the edges of the two sheets of cloth Fi and Fo after the curl C is extended. To be made. For this reason, the processing for the edges of the two fabrics Fi and Fo is performed with high accuracy and uniformity. Therefore, a high quality sewing product can be produced efficiently.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the summary of this invention.

  Further, in the above embodiment, the lower air ejection part 43 is in contact with the inclined surface 4123 of the groove part 4122, but the positional relationship between the lower air ejection part 43 and the groove part 4122 is not limited to this.

  Moreover, although the lower air ejection part 43 in the said embodiment consisted of the pipe-shaped body, for example, it can also be made into a block shape like the upper fabric clamping part 411 provided with the upper air ejection part 42, and the shape is It is not limited.

DESCRIPTION OF SYMBOLS 1 Sewing machine 11 Needle 12 A part of lower support part, Needle plate 13 Material presser 2 Sewing machine main body 3 Cylinder part 4 Curl removal mechanism 41 Material pinching part 411 Upper cloth pinching part 4111 Inclined part (upper cloth pinching part)
412 Lower cloth pinching portion 4121 Part of the lower support portion, upper surface portion (lower cloth pinching portion)
4122 Groove part 42 Upper air ejection part 43 Air ejection part, lower air ejection part 431 Air ejection hole 5 Edge guide part 6 Fabric cutting mechanism 61 Female part Fi Inner ring side fabric Fo Outer ring side fabric C Curl X Virtual surface S Gap

Claims (5)

A lower support for supporting the fabric from below;
Above the lower support portion, a fabric presser that presses the fabric from above,
A curl removing mechanism that is provided in front of the cloth presser and extends a curl generated at an edge of the cloth on the lower support part,
The decurling mechanism includes a sewing machine having an air ejection portion that generates an air flow in a direction parallel to or away from a virtual plane that is a plane extending outwardly from the edge of a portion that is not curled in the fabric. . The air ejection part has an air ejection hole that forms the air flow by ejecting air,
The decurling mechanism is a position away from the fabric of the air ejection portion in the normal direction of the virtual plane, and further toward the downstream position of the airflow than the air ejection hole, as the downstream direction. The sewing machine according to claim 1, wherein the sewing machine has a slope approaching a virtual plane.   The sewing machine according to claim 1, wherein the air ejection portion is positioned below the fabric.   The sewing machine according to claim 3, wherein the curl removal mechanism further includes an upper air ejection portion that generates an airflow that is directed above the fabric and in a direction approaching the virtual surface. An edge guide portion that contacts the edge of the fabric;
The sewing machine according to claim 3 or 4, wherein a gap through which the airflow passes is provided between the lower support portion and a lower end edge of the edge guide portion.

Images