JP6508535B2 - sewing machine - Google Patents

Description

  The present invention relates to a sewing machine provided with a cutting unit that cuts a cloth prior to sewing.

  The presser foot is provided with a cutting portion, which cuts the sequentially fed dough by means of this cutting portion to form an edge on the dough, one of the two end edges being located above and the other being located below. Thus, for example, a sewing machine capable of forming a sewn product having a tubular portion by superposing the ends of the fabric and feeding the overlapped portion below the needle drop hole provided in the fabric press and stitching together Exists. For example, it is a sewing machine described in Patent Document 1.

  The cutting unit includes a fixed knife fixed to the main body of the fabric presser, and a movable knife provided so as to be able to approach and move away from the fixed knife. Each knife has a cutting edge at its tip. When the movable knife approaches the fixed knife, the dough can be cut by overlapping the cutting edges of the knife like a scissors.

  However, as shown in FIG. 9, the defective edge X is formed due to partial shifting of the edge KUe of the fabric after cutting (in particular, the upper fabric KU located at the upper side during sewing) and the stitch S of the stitching. Problems may occur. The illustrated state shows a defect X in a state in which the edge KUe of the upper cloth KU partially protrudes from the stitch S. On the other hand, the edge KUe of the upper fabric KU may be partially recessed with respect to the stitch S. When these conditions occur, there is a problem that the appearance of the sewn product becomes worse. To cope with this problem, adjustment was made by shifting the cutting position in the horizontal direction (left and right direction) of the cloth (upper cloth KU and lower cloth KL) by changing the position of each knife relative to the main body of the cloth presser. (Non-Patent Document 1).

  However, this adjustment is troublesome because the positions of the cutting edges of the fixed knife and the movable knife have to be adjusted individually, and further, because the material after cutting expands and contracts, etc., the lower part of the needle drop hole Since the position of the edge of the fabric may be shifted when reaching the point, the above-mentioned failure could not be surely suppressed.

Japanese Utility Model Publication No. 59-34457

"FD-62 DRY Instruction Manual", 3rd edition, Yamato Sewing Machine Co., Ltd., September 2009, p. 28

  Therefore, in view of the above problems, the present invention has an object to provide a sewing machine capable of suppressing a problem in which an end edge of a fabric after cutting and a stitch are partially shifted, more easily and reliably than in the prior art.

The present invention has a fabric presser for pressing the fabric before sewing from above, and the fabric presser vertically penetrates the fabric presser body located above the fabric feed path and the fabric presser body to perform sewing And the needle drop hole through which the vertically moving needle passes, and the feed side of the needle drop hole in the cloth feed direction, and the cloth fed to the cloth presser is cut to cut the edge along the cloth feed direction An end edge of the fabric which is fixed to the fabric presser main body between the cutting portion to be formed, the needle drop hole and the cutting portion, and which is the upper side in the overlapping state during sewing among the fabrics after cutting by the cutting portion And a dough guide having a guiding surface for guiding the dough to the lower side of the needle drop hole by bringing the dough into contact , the dough guide being in a direction intersecting the guiding face with respect to the dough pressing main body Moveable A sewing machine, which is a.

  According to this configuration, the dough after being cut by the cutting portion can be sent below the needle drop hole in the dough presser while being guided by the dough guide. Then, by moving the dough guide with respect to the dough pressing main body, the guiding position of the dough can be changed in the direction intersecting the guiding surface. For this reason, the adjustment is easy because the edge of the cut fabric and the sewn position can be matched simply by moving the fabric guide.

  And the said induction | guidance | derivation surface can be made into the flat surface in alignment with the cloth feeding direction.

  According to this configuration, it is possible to reliably guide the dough by placing the dough to be sent below the needle hole on the flat guiding surface.

  The dough guide may be fixed to the dough pressing main body by a coupling means, and the coupling means may be operable for fixing and releasing from above.

  According to this configuration, since the operator (the operator of the sewing machine, etc.) can operate the coupling means from above, the position adjustment of the cloth guide with respect to the cloth presser main body can be easily performed at any time.

  The present invention is easy to adjust, since the sewed position and the edge of the fabric can be matched by only moving the fabric guide. For this reason, the problem that the edge of the material after cutting and the stitch are partially shifted can be suppressed more easily and surely than in the past.

It is a perspective view showing a sewing machine of this embodiment. It is the perspective view seen from the front upper direction which shows a cloth | dough presser among sewing machines of this embodiment. FIG. 3 is a perspective view from the front upper side showing the fabric presser of the sewing machine of the present embodiment together with another part (lower guide) located in front of the fabric presser. It is the perspective view seen from the front lower part which shows a material | dough presser among sewing machines of this embodiment. It is the perspective view seen from the front lower part which shows the state which removed the press board in the cloth presser among sewing machines of this embodiment. (A) to (e) are all schematic views of a longitudinal sectional view showing how the dough is cut and fallen down from the front to the rear (from the feed source side to the destination side in the material feeding direction). (A) is a front view (a front view) showing a modified example of the dough guide (upper dough guide), (b) is a bottom view of the same, and (c) is another modified example of the dough guide (upper dough guide) The front view which shows, (d) is the bottom view. (A)-(c) is a front view showing a modification of a dough guide (upper dough guide) with a part of dough press. It is the schematic of the planar view which shows the state which the defect which the edge of the upper fabric and the stitch of a stitching | matching stitch produced shifted, showing the sewing start side upwards and the sewing end side downwards.

  Next, one embodiment of the present invention will be described. In the following, regarding the expression in the front-rear direction, the direction toward the operator (operator) who performs sewing is referred to as the front, and the direction away from the operator is the back. In addition, regarding the expression of upper, lower, left and right, it is expressed in the direction when the operator looks at the sewing machine. Moreover, regarding the expression inside and outside, the center side in the left-right direction is inside, and the opposite side is outside. In addition, there is a place where the material feeding direction is also used as the reference of the direction. The feed source side in the material feed direction is the front side, and the destination side is the rear side.

  The sewing machine 1 of the present embodiment is a delivery arm type flat-stitch sewing machine. The sewing machine 1 is used, for example, to sew a sleeve and a body in sportswear and a crotch in underwear. This sewing machine 1 comprises an arm 2 extending in one direction at the top of the frame as shown in FIG. The lower part of the frame is provided with a cylindrical bed 3 extending in the front-rear direction and different from the arm 2. The tip of the arm 2 is bent substantially at a right angle, and is opposed to the top surface of the tip of the bed 3. The arm 2 supports a downwardly extending presser bar 4. The presser bar 4 is configured to be able to move up and down. The cloth presser 5 is attached by passing the support part 511 (see FIG. 2) of the cloth presser through the lower end portion of the presser bar 4.

  The fabric presser 5 is a member for pressing each fabric KL, KU (see FIGS. 6A to 6E) before sewing from above. The presser foot 5 abuts on the needle plate 6 positioned on the upper surface of the bed 3 as the presser bar 4 descends. The respective fabrics KL, KU are sandwiched between the lowered fabric presser 5 and the needle plate 6. In this state, each of the fabrics KL and KU is fed from the front to the rear by a feed mechanism (not shown) moving back and forth with respect to the needle plate 6 and moves up and down so as to pass through the needle drop hole 53 The needle is sewn by a needle (not shown, and the locus NL of the needle moving up and down in FIG. 6E is indicated by a two-dot chain line).

  The fabric presser 5 mainly includes a fabric presser main body 51, a needle hole 53, a cutting unit 7, and a fabric guide (upper fabric guide) 8.

  The dough pressing main body 51 is located above the dough feeding path from the front to the rear on the needle plate 6. The front side portion of the fabric presser main body 51 is bifurcated into right and left, and two presser feet (left presser foot 52L and right presser foot 52R) parallel to each other and extending forward are formed.

  An oblong needle drop hole 53 which penetrates the presser body 51 in the vertical direction and extends in the left-right direction in a plan view is formed at a position corresponding to the lower side of the needle in the presser body 51.

  Fabrics as sewing objects (in the present embodiment, two sheets of lower fabric KL and upper fabric KU, for example, when sewing in a tubular shape, using one sheet of fabric, two edges in the fabric 6) can be sewn with respect to a portion including the end edges of the respective fabrics KL and KU while being held between the left and right presser feet 52L and 52R and the needle plate 6, as shown in FIG. Be done. Then, it is fed below the needle drop hole 53 by the feeding mechanism and sewn by a plurality of needles arranged in parallel in the left-right direction.

  The cutting unit 7 is positioned on the front side (the feed source side in the material feeding direction) than the needle drop hole 53 in the material pressing main body 51, and cuts the material KL, KU fed to the material pressing 5 and ends along the material feeding direction. Form a new edge. The cutting unit 7 includes a fixed knife 71 and a movable knife 72. As shown in FIGS. 2 and 4, a fixed knife 71 is fixed to the left presser foot 52L. The movable knife 72 is held on the outside of the right presser foot 52R. The movable knife 72 receives the driving force from the knife drive arm 73 (see FIG. 1) and reciprocates in the left-right direction 7M. Between the left and right presser feet 52L and 52R is a guide space portion 54 opened forward, so that the fixed knife 71 and the movable knife 72 face the blade tip in the front-rear direction middle part of the guide space 54. To position. As shown in FIG. 6 (a), the respective fabrics KL and KU are introduced into the guide space 54 in a state where the portions close to the edge stand and are combined on the needle plate 6. As shown in FIG. 6 (b), when the respective fabrics KL and KU are moved to a position sandwiched between the fixed knife 71 and the movable knife 72, the cutting edges of the fixed knife 71 and the movable knife 72 overlap. The part which has come out above each knife 71 and 72 is cut. And the part which remains below each knife 71 and 72 is provided to sewing.

  As shown in FIG. 4, the front side portion of the portion of the fabric pressing main body 51 located behind the fixed knife 71 and the movable knife 72 is a guide which is closed at the top and opened downward and forward and backward, as shown in FIG. The groove 55 is used. The inner surface of the guide groove 55 is curved and, as shown in FIG. 5, is connected to the needle drop hole 53 while the width dimension (dimension in the left-right direction) decreases toward the rear. As shown in FIGS. 6 (c) to 6 (e), the respective fabrics KL and KU which are cut along the edges by the cutting unit 7 move so that the respective fabrics KL and KU fall over, and the lower fabrics A portion including the edge of KL and a portion including the edge of the upper fabric KU overlap in a band shape. In this state, each material KL, KU is fed below the needle drop hole 53.

  Two pressing plates 56L and 56R are separately attached to the left and right of the left and right pressing feet 52L and 52R from the front end to the rear, as shown in FIG. As shown in FIGS. 6A to 6E, the lower surface of the left pressure plate 56L abuts on the lower fabric KL, and the lower surface of the right pressure plate 56R abuts on the upper fabric KU. A part of each pressing plate 56L, 56R protrudes below the guide space 54 and the guide groove 55. For example, the left pressing plate 56L is provided with a protrusion 56La as shown in FIG. As shown in FIGS. 6 (b) to 6 (d), the projection 56La is positioned above the lower cloth KL passing the cloth presser 5, thereby turning the lower cloth KL closer to the needle plate 6. You can go there. Thus, according to the protruding shape of the pressing plates 56L and 56R, the respective fabrics KL and KU are shown in FIGS. 6 (c) to 6 (e) from the combined palm state shown in FIGS. 6 (a) and 6 (b). The lower dough KL is located at the lower side, and the upper dough KU can be located at the upper side.

  Further, the dough guiding portion 9 before cutting is located in front of the cutting portion 7 in the dough presser 5. As shown in FIG. 3, the dough guiding section 9 before cutting is provided with a lower guide 91, a left guide 92 and a right guide 93. The lower portion of the lower guide 91 is fixed to the bed 3 at its front portion, and has a flat shape whose rear portion extends in the front-rear direction. A front end side portion of the front portion of the lower guide 91 is located in the guide space portion 54. The left guide 92 is fixed to the left presser foot 52 L and protrudes into the guide space 54. The right guide 93 is fixed to the right presser foot 52 R and protrudes into the guide space 54. As shown in FIG. 6A, the lower fabric KL and the upper fabric KU are placed along the left and right sides of the lower guide 91 by the pre-cutting fabric guiding portion 9 configured as described above, so that the respective fabrics KL and KU can be It can introduce | transduce into the guidance space part 54 as a total palm state, and can cut | disconnect each raw material KL and KU by the cutting part 7 smoothly.

  The upper dough guide 8 as the dough guide in the present invention is fixed to the dough pressing main body 51 (in the present embodiment, the left pressing foot 52L which is a part of the dough pressing main body 51) between the needle drop hole 53 and the cutting portion 7. And the guiding surface 821 for guiding the respective fabrics KL and KU after cutting by the cutting section 7 downward to the needle drop hole 53.

  As shown in FIG. 5, the upper fabric guide 8 is L-shaped in a bottom view, and a plate-like support 81 extending in the left-right direction and a plate-like guide extending rearward from the inward end of the support 81 A groove protrusion 82 is provided. As shown in FIGS. 6 (c) and 6 (d), the upper fabric guide 8 of the present embodiment is an L-shape in which the support portion 81 and the guide groove projecting portion 82 are orthogonal also in the forward and backward views. ing. The support portion 81 is embedded in a groove formed in the left presser foot 52L so that the lower surface is flush with the lower surface of the left presser foot 52L. The lower surface of the support portion 81 is not limited to the same surface, and the lower surface of the support portion 81 is located above the lower surface of the left presser foot 52L (when viewed from below as shown in FIG. 5, the support portion 81 is retracted) May). The support 81 has a constant width in the front-rear direction, and can slide relative to the groove of the left presser foot 52L.

  The upper cloth guide 8 is fixed to the cloth pressing main body 51 by a screw 83 as a coupling means. The support portion 81 has a screw hole in which a female screw is formed, and a screw 83 penetrating the left presser foot 52L is screwed into the screw hole. The upper cloth guide 8 is movable in a direction 8M (left and right direction in the present embodiment) intersecting the guiding surface 821 with respect to the cloth pressing main body 51 in a state in which the screw 83 is loosened. It is fixed to the presser body 51. In order to make it movable in this manner, the through holes through which the screws 83 penetrate in the vertical direction in the fabric pressing main body 51 are long holes extending in the left-right direction (not shown).

  The guide groove protrusion 82 is located in the guide groove 55 from the rear of the cutting portion 7 to the front of the needle drop hole 53. Since the height of the guide groove 55 decreases as it goes from the front to the rear, the guide groove protrusion 82 also matches this, and as shown in FIG. 5, the height decreases as it goes from the front to the rear. It has a substantially triangular shape. The inner surface of the guide groove protrusion 82 is a guiding surface 821 and is a flat surface along the material feeding direction. The guiding surface 821 is movable in the direction 8M (left and right direction) orthogonal to the guiding surface 821 by the slide of the support portion 81 with respect to the left presser foot 52L. As shown in FIGS. 6 (d) and 6 (e), the leading edge of the upper cloth KU comes into contact with the leading edge of the upper cloth KU. By moving the end edge of the upper cloth KU cut and aligned by the fixed knife 71 and the movable knife 72 of the cutting unit 7 along the flat guiding surface 821, the upper cloth KU is dropped without shifting left and right It is guided to the hole 53 and sewed. Thus, by guiding the edge of the upper fabric KU sent downward of the needle drop hole 53 to the flat guiding surface 821, it is possible to reliably guide the upper fabric KU. Then, as shown in FIG. 5, the rear end of the guiding surface 821 is at a very short distance from the needle drop hole 53. For this reason, it is possible to sew while keeping the state of positioning in the left and right direction of the edge of the upper fabric KU by the guiding surface 821. Therefore, the position of the edge of the upper cloth KU determined by the cloth guide 8 is less likely to be distorted after leaving the guiding surface 821.

  FIGS. 6 (a) to 6 (e) schematically show changes in the state of each of the fabrics KL and KU in the fabric presser 5. The order of the fabric feeding will be described below. 6 (a) is a position in front of the cutting portion 7 in the guiding space portion 54, FIG. 6 (b) is a position of the cutting portion 7 and FIG. 6 (c) is in the rear of the cutting portion 7 in the guiding space portion 54. 6D shows the position near the front end of the guide groove 55, and FIG. 6E shows the position near the rear end of the guide groove 55. As shown in FIG.

  As shown in FIG. 6A, the lower cloth KL and the upper cloth KU are in an integrated palm state in which a predetermined width is overlapped from the end (the end before being cut and aligned by the cutting portion 7) by the operator or the like. . The respective fabrics KL and KU are introduced into the guide space 54 with the superposed portions standing on the needle plate 6. The introduced lower and upper doughs KL and KU reach the position between the fixed knife 71 and the movable knife 72 in the cutting section 7 as shown in FIG. Thus, a new edge is formed and then sent backward as shown in FIG. 6 (c) (d).

  As described above, while the respective fabrics KL and KU are fed, the lower fabric KL which is pressed by the left presser foot 52L is pushed downward by the projecting portion 56La of the left presser plate 56L which projects into the guide space 54, and the needle plate It is knocked down along the upper surface of 6. On the other hand, the upper cloth KU held down by the right holding plate 56R falls down along the inner surface of the guide groove 55, overlaps the upper part of the lower cloth KL on the needle plate 6, and in this state Be sent.

  In the present embodiment, the dough presser 5 is provided with the upper dough guide 8. For this reason, as shown in FIG. 6E, the falling edge of the upper cloth KU abuts on the guiding surface 821 of the upper cloth guide 8 by the cutting portion 7 and the falling of the upper cloth KU is completed. And sewing is done in this state. Therefore, it is possible to reliably suppress the conventional problem that the edge of the material after cutting and the stitch are partially shifted.

  According to the fabric presser 5 of the present embodiment configured as described above, the fabric (in particular, the upper fabric KU) after being cut by the cutting unit 7 is tipped down while being guided by the upper fabric guide 8. It can be sent below the hole 53. Then, by moving the upper dough guide 8 with respect to the dough pressing main body 51, it is possible to change the induction position of the upper dough KU in the direction intersecting the guiding surface 821. For this reason, the position to be sewn can be made to coincide with the end edge of the upper cloth KU simply by moving the upper cloth guide 8, so that the adjustment is easy.

  In addition, for example, even when the upper fabric guide 8 is slid to the left limit, in the case where the end edge of the upper fabric KU is still recessed with respect to the stitches, the fabric presser main body 51 conventionally made It is necessary to adjust by changing the positions of the fixed knife 71 and the movable knife 72 in conjunction with the above. On the contrary, when the edge of the upper fabric KU is in a state of protruding from the stitch, adjustment of the upper fabric guide 8 alone is possible. For this reason, when independent adjustment is possible, it is only necessary to loosen the screws 83 and slide the upper material guide 8, so that the adjustment can be dramatically simplified as compared with the prior art.

  By the way, the defect that the edge of the upper cloth KU and the stitches are partially shifted after cutting is squeezed in the lateral direction position of the edge of the upper cloth KU after cutting each cloth KL, KU by the cutting portion 7 It is presumed that it was generated due to the occurrence of or a partial stretching of the upper fabric KU. Since the softness and the stretchability differ depending on the type of fabric, the above-mentioned failure may occur, for example, when the upper fabric KU used for sewing is changed. The use of the fabric presser 5 of the present embodiment is advantageous because it can cope with the case where sewing is performed by changing the kind of fabric as described above.

  In addition, as the processing on the design of the sewing product, the end of the upper cloth KU can be easily pulled out or retracted with respect to the stitch, because this can be easily performed by sliding the upper cloth guide 8, so the sewing variation is made It is also advantageous in that it can be expanded.

  In addition, the screw 83, which is a coupling means, can be operated from above to fix and release (tightening operation and loosening operation). For this reason, even if the fabric presser 5 is not temporarily removed from the sewing machine 1 or moved from the needle plate 6, the operator only has to operate only the screw 83 with a driver or the like. Position adjustment of the dough guide 8 can be easily performed at any time.

  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.

  For example, the shape of the dough guide in a bottom view is not limited to the L shape as in the upper dough guide 8 of the above embodiment, but includes a guiding surface 821 and a support portion 81 for movably supporting the guiding surface 821. Just do it. Further, even in the L-shape, the positional relationship in the front-rear direction of the guide groove projecting portion 82 with respect to the support portion 81 is opposite to that of the upper fabric guide 8 in the embodiment described above. It can also be shaped so as to extend forward from the forward end (see FIGS. 7 (a) and 7 (b)). For example, it may be T-shaped (see FIGS. 7 (c) and 7 (d)) or a rectangle. Further, the guiding surface 821 is not limited to a flat surface as in the above embodiment, but may be a curved surface. Further, the bottom surface of the groove formed in the fabric guide can be used as the guiding surface 821.

  Furthermore, the shape of the dough guide in forward and backward views is not limited to the L-shape as in the upper dough guide 8 of the embodiment, but may be, for example, a horizontally-long rectangle.

  Further, in the upper fabric guide 8 of the embodiment, the support portion 81 and the guide groove projecting portion 82 are orthogonal to each other, but for example, they may intersect at an acute angle as shown in FIG. It may intersect at an obtuse angle as shown in b). Moreover, although the guide groove protrusion part 82 of the said embodiment was flat form, it may be a curved plate form as shown in FIG.8 (c).

  Further, the movable direction of the dough guide is not limited to one movable in the direction (left and right direction) orthogonal to the guiding surface 821 like the upper dough guide 8 of the embodiment, but is oblique to the guiding surface 821 It may be movable in the direction.

  Further, the coupling means for fixing the dough guide to the dough pressing main body 51 is not limited to the screw 83 as in the above embodiment. Various means can be used, such as, for example, means that can be fixed without penetration, such as clamps.

Reference Signs List 1 sewing machine 2 arm 3 bed 4 presser bar 5 fabric presser 51 fabric presser main body 52L left presser foot 52R right presser foot 53 needle drop hole 6 needle plate 7 cutting unit 8 fabric guide, upper fabric guide 81 support unit 82 guide groove protrusion 821 Inducing surface 83 Bonding means, bis 9 Before cutting the fabric guiding part KL Dough, Lower Dough KU Dough, Upper Dough

Claims (3)

It has a fabric presser that presses the fabric before sewing from above,
The fabric presser is
A presser body located above the feed path of the dough;
A needle drop hole which vertically penetrates the material holding body and through which a needle moving up and down for sewing passes;
A cutting portion located on the feeding side in the material feeding direction with respect to the needle drop hole, and cutting the material fed into the material press to form an edge along the material feeding direction;
It is fixed to the fabric presser main body between the needle drop hole and the cutting portion, and among the fabrics after cutting by the cutting portion , abuts the edge of the fabric which is the upper side in the overlapping state at the time of sewing , and a fabric guide having a guide surface for guiding the fabric downwardly of said needle hole,
The sewing machine according to claim 1, wherein the dough guide is movable in a direction intersecting the guiding surface with respect to the dough pressing main body.   The sewing machine according to claim 1, wherein the guiding surface is a flat surface along a fabric feeding direction. The dough guide is fixed to the dough pressing main body by coupling means.
The sewing machine according to claim 1 or 2, wherein the connecting means is operable for fixing and releasing from above.

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