JP6084059B2 - Loop sewing device and sewing machine - Google Patents

Description

  The present invention relates to a loop sewing apparatus for sewing an embroidery thread on a fabric in a loop shape. Furthermore, this invention relates to the sewing machine provided with the loop sewing apparatus.

  As an embroidery method for three-dimensionally decorating a fabric, a method is known in which an embroidery thread such as a woolen thread that is thicker than a normal sewing thread is used and the embroidery thread is sewn in a loop shape on the fabric. This embroidery method requires an additional part for forming the embroidery thread in a loop on the fabric and sewing it.

  For example, in the invention described in Patent Document 1, a guide member (guide body) for guiding an embroidery thread to a through hole (through hole) of a cloth presser for loop sewing is fixed to the cloth presser with a screw. The guide member moves up and down together with the cloth presser in conjunction with the needle bar to which the sewing needle is attached.

  In Patent Document 2, a sewing machine including a plurality of embroidery devices is shown, and loop sewing is performed by embroidery devices at both ends. The loop sewing apparatus includes a guide member that guides the embroidery thread to the through hole (insertion hole) of the cloth presser. The guide member moves up and down in conjunction with the needle bar to which the sewing needle is attached. Further, the loop sewing apparatus includes a cloth presser that is different from an embroidery apparatus that does not have a loop sewing function. The cloth presser has a drive shaft that is arranged to be shifted in the left-right direction from the needle bar. The cloth presser moves up and down in conjunction with the needle bar and the guide member.

JP-A-8-246323 Japanese Patent Laid-Open No. 9-31826

  The sewing machines described in Patent Documents 1 and 2 require a complicated structure for moving the guide member and the cloth presser up and down in conjunction with the needle bar in order to form the embroidery thread in a loop shape. For this reason, the loop sewing devices described in Patent Documents 1 and 2 tend to be expensive, and cannot be attached to a sewing machine that does not have a loop sewing function by a simple method. However, many users of sewing machines desire to perform loop sewing easily while reducing costs by diverting existing sewing machines.

  Therefore, an inexpensive loop sewing device that can be attached to a sewing machine having no loop function by a simple method is desired.

  In the first aspect of the present invention, a needle bar having a sewing needle attached to the lower end and a first through hole through which the sewing needle passes when the needle bar moves up and down are formed. A cloth presser configured to move and a second through-hole through which an embroidery thread used for loop sewing passes are formed, and the embroidery thread extends to the first through-hole with respect to the axis of the first through-hole. A loop sewing apparatus is provided that includes a guide member that is fixed to the sewing machine main body so as to be guided obliquely.

  In the first aspect of the present invention, the loop sewing apparatus further includes a fixing tool that fixes the reel around which the embroidery thread is wound to the sewing machine body, and the fixing tool includes a third embroidery thread that passes from the reel. It is preferable that a through hole is formed.

  In the first aspect of the present invention, it is preferable that the first through hole has a hole diameter corresponding to the thickness of the embroidery thread.

  In the first aspect of the present invention, it is preferable that when the cloth presser moves downward to form the loop shape of the embroidery thread, the sewing needle penetrates the embroidery thread guided to the first through hole by the guide member. .

  According to a second aspect of the present invention, there is provided a sewing machine including the loop sewing device according to the first aspect of the present invention.

  According to the present invention, an inexpensive loop sewing apparatus that can be attached to a sewing machine having no loop function by a simple method is provided.

FIG. 1 is a left perspective view of a sewing machine to which a loop sewing device according to the present invention is attached. FIG. 2 is a right perspective view of the sewing machine to which the loop sewing device according to the present invention is attached. FIG. 3 is a front view of a sewing machine to which the loop sewing apparatus according to the present invention is attached. FIG. 4 is a right side view of the sewing machine to which the loop sewing apparatus according to the present invention is attached. FIG. 5 is an exploded view of the loop sewing apparatus according to the present invention. FIG. 6 is a schematic view showing the principle of loop stitching using the loop stitching device according to the present invention. FIG. 7 is a schematic view showing the principle of loop stitching using the loop stitching device according to the present invention. FIG. 8 is a schematic view showing the principle of loop stitching using the loop stitching apparatus according to the present invention. FIG. 9 is a schematic view showing the principle of loop sewing using the loop sewing device according to the present invention. FIG. 10 is a schematic view showing the principle of loop stitching using the loop stitching device according to the present invention. FIG. 11 is a schematic view showing the principle of loop sewing using the loop sewing apparatus according to the present invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the accompanying drawings, the same components are denoted by the same reference numerals.

  Initially, with reference to FIGS. 1-5, the structure of the loop sewing apparatus 1 which concerns on this invention is demonstrated.

  1 to 4 are a left perspective view, a right perspective view, a front view, and a right side view of a sewing machine 100 to which the loop sewing apparatus 1 according to the present invention is attached, respectively. The sewing machine 100 of the present embodiment is an industrial sewing machine and includes a plurality of needle bars 3 having a sewing needle 2 attached to the lower end, a cloth presser 4 and the like, as can be seen from FIG. For clarity, reference numbers are shown only for the rightmost one part. When performing embroidery sewing, an embroidery frame 6 is installed under the needle plate 5. The embroidery frame 6 is moved in a plane perpendicular to the direction in which the sewing needle 2 moves up and down, thereby enabling embroidery sewing.

  In this embodiment, loop sewing is performed using the needle bar 3 and the cloth presser 4 at the right end. Loop sewing means that an embroidery thread 9 such as a woolen thread that is thicker than a normal sewing thread is used and the embroidery thread 9 is sewn into a fabric in a loop shape. The principle of loop sewing will be described later.

  The loop sewing apparatus 1 includes a needle bar 3 having a sewing needle 2 attached to a lower end, a cloth presser 4, and a guide member 7. The upper thread 8 is passed through the threading hole of the sewing needle 2. Similar to the embroidery sewing apparatus having no loop function, the needle bar 3 moves up and down, so that the upper thread 8 and the lower thread stored in the hook (not shown) below the needle plate 5 are stitched on the fabric. Is formed.

  The cloth presser 4 is formed with a first through hole 41 through which the sewing needle 2 passes when the needle bar 3 moves up and down. The cloth presser 4 is configured to move up and down in conjunction with the needle bar 3. Further, the cloth presser 4 presses the cloth against the needle plate 5 at the time of embroidery to prevent the cloth from being displaced. The cloth presser 4 is restricted from moving downward on the upper surface of the needle plate 5, while the sewing needle 2 attached to the needle bar 3 reaches the hook through the hole of the needle plate 5. Therefore, the stroke amount of the vertical movement of the needle bar 3 is larger than the stroke amount of the cloth presser 4.

  The guide member 7 is formed with a second through hole 71 through which the embroidery thread 9 used for loop sewing passes. The guide member 7 is a plate-like member and is easily formed by press working. More specifically, the guide member 7 has a shape in which a metal plate is bent at a substantially right angle, and a circular second through hole 71 is formed at the tip of the bent portion. The guide member 7 is fixed to the sewing machine body 101 so as to guide the embroidery thread 9 obliquely with respect to the axis of the first through hole 41 to the first through hole 41 of the cloth presser 4. At this time, the axis of the second through hole 71 of the guide member 7 extends in a substantially horizontal direction. In the present embodiment, the guide member 7 is fixed to the right side surface of the sewing machine body 101 with a screw. For this reason, the guide member 7 can be easily attached to and detached from the sewing machine main body 101. If the guide member 7 is configured to guide the embroidery thread 9 obliquely with respect to the axis of the first through hole 41 to the first through hole 41 of the cloth presser 4, the left side surface of the sewing machine main body 101. Alternatively, it may be fixed to the front surface. As a result, not only the right end needle bar 3 and cloth presser 4, but also the needle bar and cloth presser at an arbitrary position can be used to perform loop sewing.

  The loop sewing apparatus 1 further includes a fixture 11 that fixes the reel 10 around which the embroidery thread 9 is wound to the sewing machine body 101. As shown in FIG. 1, the fixing tool 11 is formed with a third through hole 111 through which the embroidery thread 9 fed out from the reel 10 passes. As a result, the embroidery thread 9 always passes through a certain path from the third through hole 111 of the fixture 11 to the second through hole 71 of the guide member 7 regardless of the position where the embroidery thread 9 is fed out from the reel 10. . This prevents the embroidery thread 9 from interfering with other parts of the sewing machine 100. Furthermore, this prevents the embroidery thread 9 from being cut due to an excessive frictional force generated between the edge of the second through hole 71 and the embroidery thread 9 when the embroidery thread 9 is fed out. . Therefore, the embroidery thread 9 can be stably supplied by the fixture 11.

  FIG. 5 is an exploded view of the loop sewing apparatus 1. As shown in FIG. 5, the fixing tool 11 fixes the fixing tool main body 112, the first rod 113 and the screw 114 that fix the reel 10 to the fixing tool main body 112, and the fixing tool main body 112 to the sewing machine main body 101. Two pairs of second rods 115 and screws 116 are provided. With this configuration, it is possible to easily fix the reel 10 to the sewing machine body 101 and replace the reel 10 and thus the embroidery thread 9. The fixture main body 112 is a plate-like member and is easily formed by press working. More specifically, the fixture main body 112 has a shape in which a metal plate is bent at a substantially right angle, and a circular third through hole 111 is formed in the bent portion. As shown in FIG. 2, the fixture main body 112 is fixed to the right side surface of the sewing machine main body 101 with the second rod 115 and the screw 116. At this time, the axis of the third through hole 111 of the fixture main body 112 extends in a substantially vertical direction. The fixing position of the fixing tool main body 112 may be the left side surface or the front surface of the sewing machine main body 101. Further, the reel 10 may be arranged at a location away from the sewing machine 100 without being fixed to the sewing machine body 101 at the time of embroidery.

  With these configurations, the loop sewing apparatus 1 can be attached to a sewing machine having no loop function by a simple method. Further, the configuration of the drive unit such as the needle bar 3 and the cloth presser 4 is the same as that of the sewing machine having no loop function, and no complicated mechanism is required for loop sewing. For this reason, the inexpensive loop sewing apparatus 1 is provided.

  Next, the principle of loop sewing using the loop sewing apparatus 1 will be described with reference to FIGS. 6 to 11 are schematic views showing the principle of loop stitching using the loop stitching device 1. 6 to 11, only the needle bar 3, the cloth presser 4, the guide member 7, the embroidery thread 9, and the fabric 13 are shown for simplification.

  The embroidery thread 9 is guided obliquely with respect to the axis of the first through hole 41 to the first through hole 41 of the cloth presser 4 by the guide member 7. In FIG. 6, the needle bar 3 and the cloth presser 4 move downward, and the sewing needle 2 penetrates the embroidery thread 9 and the fabric 13. As a result, as shown in FIG. 7, the seam 12 is formed and the embroidery thread 9 is fixed to the fabric 13. Next, as shown in FIG. 7, when the needle bar 3 and the cloth presser 4 are raised, the sewing needle 2 comes out of the embroidery thread 9, and the embroidery thread 9 extends between the fabric 13 and the cloth presser 4. As shown in FIG. 8, the embroidery frame 6 and the fabric 13 are moved in the embroidery direction (leftward in FIG. 8) almost simultaneously with the raising of the cloth presser 4. As a result, the embroidery thread 9 is fed out from the reel 10.

  Next, as shown in FIG. 9, the needle bar 3 and the cloth presser 4 are moved downward to form the loop shape of the embroidery thread 9. The angle α between the direction in which the embroidery thread 9 guided to the first through hole 41 by the guide member 7 extends and the longitudinal direction of the sewing needle 2 becomes the largest immediately before the cloth presser 4 moves downward. At this time, the sewing needle 2 passes through the embroidery thread 9 guided to the first through hole 41 of the cloth presser 4 by the guide member 7. For this reason, the sewing needle 2 penetrates the embroidery thread 9 in the state where the embroidery thread 9 lies in the first through hole 41. This reduces defects in which the sewing needle 2 cannot penetrate the embroidery thread 9 successfully.

  As shown in FIG. 10, when the needle bar 3 and the cloth presser 4 move downward with the sewing needle 2 penetrating the embroidery thread 9, the needle 13 and the cloth presser 4 extend between the cloth 13 and the cloth presser 4. The embroidery thread 9 is pushed by the cloth presser 4 to form a loop 14.

  As shown in FIG. 11, when the needle bar 3 and the cloth presser 4 move upward again and the sewing needle 2 comes out of the fabric 13, a second seam 12 is formed. Thus, the loop 14 of the embroidery thread 9 is formed between the two seams 12. By repeating the above operation, the loop 14 is continuously formed on the fabric 13.

  As apparent from the above description, the sewing needle 2, the upper thread 8, and the embroidery thread 9 are passed through the first through hole 41 of the cloth presser 4. As shown in FIGS. 7 and 11, when the needle bar 3 and the cloth presser 4 are raised, it is desirable that the tensile force applied to the embroidery thread 9 by the cloth presser 4 is as small as possible. This is because if the tensile force is too large, the seam 12 already formed may be released. In this case, it is advantageous that the first through hole 41 has a larger hole diameter. On the other hand, as shown in FIG. 9, when the needle bar 3 and the cloth presser 4 are moved downward, the sewing needle 2 is surely inserted in the first through hole 41 of the cloth presser 4 without swinging the embroidery thread 9. Need to penetrate. In this case, it is advantageous that the first through hole 41 has a smaller hole diameter.

In order to satisfy the above requirements, it is preferable to adapt the diameter of the first through hole 41 in accordance with the thickness of the embroidery thread 9. This adaptation can be easily performed by replacing the cloth presser 4. Table 1 shows a correspondence table between the thickness of the embroidery thread 9 and the hole diameter of the first through hole 41.

  The thickness of the embroidery thread 9 is defined by the number of bar needles used in hand knitting. As shown in Table 1, it is preferable to use a cloth presser 4 in which a first through hole 41 having a diameter of 2 mm is formed for the embroidery thread 9 defined by the 3-4 needles. For the embroidery thread 9 defined by the 5-7 needles, it is preferable to use a cloth presser 4 in which a first through hole 41 having a diameter of 2 mm or 3 mm is formed. For the embroidery thread 9 defined by the 8-9 needles, it is preferable to use a cloth presser 4 in which a first through hole 41 having a diameter of 3 mm or 3.7 mm is formed. For the embroidery thread 9 defined by the 10-15 needles, it is preferable to use a cloth presser 4 in which a first through hole 41 having a diameter of 3.7 mm is formed.

  The cloth presser 4 having a hole diameter of 3.7 mm is usually used in a sewing machine that does not have a loop sewing function. Therefore, when using the embroidery thread 9 defined by the 8-9 or 10-15 bar needles, it is not necessary to replace the cloth presser 4.

  As mentioned above, although preferred embodiment which concerns on this invention was described, this invention is not limited to this embodiment, A various correction and change can be given within description of a claim.

DESCRIPTION OF SYMBOLS 1 Loop sewing apparatus 2 Sewing needle 3 Needle bar 4 Cloth presser 41 1st through-hole 5 Needle plate 6 Embroidery frame 7 Guide member 71 2nd through-hole 8 Upper thread 9 Embroidery thread 10 Reel 11 Fixing tool 111 3rd penetration Hole 112 Fixing device main body 113 First rod 114 First screw 115 Second rod 116 Second screw 12 Seam 13 Fabric 14 Loop 100 Sewing machine 101 Sewing machine main body

Claims (5)

A needle bar with a sewing needle attached to the lower end;
A first through hole through which the sewing needle passes when the needle bar moves up and down, and a cloth presser configured to move up and down in conjunction with the needle bar;
A second through-hole through which an embroidery thread used for loop sewing passes is formed, and the sewing machine is configured to guide the embroidery thread to the first through-hole obliquely with respect to the axis of the first through-hole. A loop sewing device comprising a guide member fixed to the main body.   Furthermore, a fixing tool for fixing the reel around which the embroidery thread is wound to the sewing machine body is provided, and the fixing tool has a third through hole through which the embroidery thread fed from the reel passes. The loop sewing apparatus according to claim 1.   The loop sewing device according to claim 1 or 2, wherein the first through hole has a hole diameter corresponding to a thickness of the embroidery thread.   The sewing needle penetrates the embroidery thread guided to the first through hole by the guide member when the cloth presser moves downward to form a loop shape of the embroidery thread. 4. The loop sewing device according to any one of 3 above.   A sewing machine comprising the loop sewing device according to any one of claims 1 to 4.

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