JP2013146428A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine which reduces resistance received by a needle thread when the needle thread is pulled up by a thread take-up lever, thereby preventing the occurrence of defective pulling up of the needle thread by the thread take-up lever.SOLUTION: The tip of an inner hook stopper 41 of an inner hook 4 protrudes further toward the side of a needle hole 81 than an abutment part 7 and extends to the opening end of a cloth feed hole on the side of a horizontal hook 2. Thereby, an angle θ1 formed by an upper side needle thread 100 passing through between the inner hook stopper 41 and the abutment part 7 and by a center line 101 of the needle hole 81 becomes smaller than an angle formed, in a prior art, by an upper side needle thread passing through between an inner hook stopper and an abutment part and by a needle hole. The needle thread can pass through the needle hole 81 at an angle closer to a perpendicular angle to a needle plate 1. As a result, when the needle thread 100 is pulled up by a thread take-up lever, resistance received at the lower end position of the needle hole 81 can be reduced, so that the needle thread can be prevented from being defectively pulled up by the thread take-up lever. Consequently, stitches are prevented from being disordered, and the needle thread is prevented from being doubly caught by a hook point.

Description

  The present invention relates to a sewing machine, and more particularly, to a two-needle sewing machine having a pair of left and right horizontal shuttles.

  Conventionally, there is a sewing machine provided with a pair of left and right horizontal hooks below the needle plate (see, for example, Patent Document 1). In the sewing machine, two sewing needles move up and down in the needle holes of the needle plate to form stitches. Each horizontal hook has an outer hook that rotates clockwise around the axis extending in the vertical direction according to the vertical movement of the sewing needle, and an inner hook that is supported by the outer hook and that is rotatable independently of the outer hook. I have. A pair of contact portions project from the lower surface of the needle plate, and the inner hook stop portion of the inner hook comes into contact with the contact portion. The inner hook stopper restrains the inner hook so that the inner hook does not rotate following the outer hook. The sewing machine catches the upper thread that has passed through the cloth with the sewing needle with the sword tip of the outer hook, passes between the outer hook and the inner hook, and entangles the upper thread with the lower thread pulled out from the lower thread hole of the inner hook in the stopped state. When the balance of the sewing machine pulls up the upper thread, the upper thread passes through the gap between the tip of the inner hook stopper and the contact part of the throat plate and is released from the horizontal hook. To do.

JP-A-8-299645

  However, the hook device of the sewing machine of Patent Document 1 has a horizontal distance from the contact position between the inner hook stopper of the inner hook and the contact portion of the needle plate to the needle hole of the needle plate, and the height in the vertical direction. Are substantially identical. Therefore, the upper thread bends in the horizontal direction at the lower end position of the needle hole when passing through the gap between the tip of the inner hook stopper and the contact portion of the needle plate. Since the upper thread bends in the horizontal direction at the lower end position of the needle hole, it receives resistance at the bent position when it is pulled up by the balance. As a result, in the sewing machine, the pulling of the upper thread by the balance is not stable, causing a pulling failure, and a beautiful stitch may not be formed.

  An object of the present invention is to provide a sewing machine that can reduce the resistance received when an upper thread is pulled up by a balance and prevent the occurrence of an upper thread pulling failure by the balance.

  The sewing machine according to claim 1 includes a rotary hook that is rotatably supported, an inner hook that is rotatably supported relative to the outer hook inside the outer hook, and a hook of the inner hook. In a sewing machine including an opening on the outer peripheral surface and a needle plate facing the needle plate, the needle plate includes a needle hole that penetrates in a vertical direction so that a sewing needle passing through an upper thread can be inserted, and a contact portion that protrudes downward from the lower surface. The hook includes an inner hook stopper provided at an opening of an outer peripheral surface of the inner hook and abutting on the abutting portion to prevent the inner hook from rotating together with the outer hook; Is spaced from the hook side end of the needle plate to the needle hole side and is located between the hook side end of the needle plate and the needle hole side end, and the inner hook stopper is the abutment The tip part on the part side is in contact with the contact part. In the sewing machine having this configuration, the contact portion is spaced from the hook side end portion of the needle plate toward the needle hole side and is positioned between the hook side end portion and the needle hole side end portion of the needle plate. The inner hook stop portion of the inner hook comes into contact with the abutting portion at the tip on the abutting portion side. Therefore, the contact position between the inner hook stopper and the contact portion approaches the distance in the horizontal direction with respect to the needle hole. When the upper thread passes between the inner hook stopper and the abutting part, the upper thread comes out more vertically. Therefore, it is possible to reduce the resistance that the balance receives when pulling the upper thread, and to prevent the upper thread from being pulled up poorly.

  The sewing machine according to a second aspect of the invention has the structure of the invention according to the first aspect, wherein the needle plate has the needle hole and feeds the work cloth, and the feed part slides in the direction of feeding the work cloth. And an opening provided movably, wherein the distal end extends to an edge of the opening on the hook side. In the sewing machine having this configuration, the front end portion of the inner hook stopper extends to the edge of the hook side of the opening provided in the needle plate so as to be slidable with the feeding portion having the needle hole and feeding the work cloth. Therefore, the contact position between the inner hook stopper and the contact portion can be made closer to the horizontal distance from the needle hole. When the upper thread passes between the inner hook stopper and the contact part, the upper thread can be further pulled out in the vertical direction. Therefore, the resistance received when the balance pulls up the upper thread can be further reduced to further prevent the upper thread from being pulled up poorly.

  According to a third aspect of the present invention, in addition to the structure of the first or second aspect of the invention, the contact portion includes a contact wall that contacts the inner hook stopper when the outer hook rotates, and the contact wall And an inclined surface extending downward from the lower end portion in a direction away from the inner hook stopper. In the sewing machine having this configuration, the contact portion includes a contact wall that contacts the inner hook stopper, and an inclined surface that extends downward from the lower end portion of the contact wall in a direction away from the inner hook stopper. The contact area with the inner hook stopper is reduced by the inclined surface. Therefore, the upper thread can smoothly escape between the inner hook stopper and the contact portion.

  In the sewing machine according to claim 4, in addition to the structure of any one of claims 1 to 3, the lower end of the inner hook stopper is from the tip on the abutting portion side to the outer peripheral surface of the inner hook. Inclined downward. In the sewing machine having this configuration, the inner hook stopper is thicker on the inner hook side than on the distal end side, so that the strength in the vicinity of the base end position on the outer peripheral surface side of the inner hook is increased. Therefore, the sewing machine can prevent the inner hook stopper from being damaged near the base end position on the outer peripheral surface side of the inner hook when the outer hook rotates.

It is a top view of the horizontal hooks 2 and 12 and the needle plate 1. FIG. 1 is a perspective view of a needle plate 1. FIG. 2 is a left side view of a needle plate 1. FIG. 1 is a front view of a needle plate 1. FIG. 4 is an enlarged view of a second contact portion 72 of the needle plate 1. FIG. 3 is an exploded perspective view of the horizontal hook 2. FIG. It is a top view of the inner hook 4. FIG. 3 is a perspective view of the horizontal hooks 2 and 12 and the needle plate 1 as seen from obliquely below. It is a front view of the horizontal hook 2 and the needle plate 1. It is the perspective view seen from the diagonal lower side of the conventional horizontal hooks 202 and 212 and the needle plate 1. FIG. It is a front view of the conventional horizontal hook 202 and the throat plate 1. It is a top view of the horizontal shuttles 20, 120 and the needle plate 1. FIG. 4 is an exploded perspective view of the horizontal hook 20. It is a top view of the inner hook 80. FIG.

  Hereinafter, a first embodiment of a sewing machine hook according to the present invention will be described with reference to the drawings. Hereinafter, the upper side, the lower side, the left side, the right side, the paper surface side, and the paper rear side of FIG. 1 are defined as the rear, front, left, right, upper, and lower sides of the needle plate 1, respectively. With reference to FIGS. 1-6, the needle | hook plate 1 and the horizontal hooks 2 and 12 arrange | positioned at the right and left of the said needle plate 1 are demonstrated. As shown in FIG. 1, the sewing machine of this embodiment is a two-needle sewing machine having two sewing needles on the left and right. The sewing machine includes horizontal hooks 2 and 12 at symmetrical positions below the left and right sides of a rectangular needle plate 1 in plan view.

  As shown in FIG. 1, the throat plate 1 has a pair of left and right cloth feed holes 10 and 11 at the center thereof. The cloth feed holes 10 and 11 include cloth feeds 8 and 18 inside. The cloth feeds 8 and 18 have needle holes 81 and 181 through which sewing needles can be inserted in the vertical direction at substantially the center in the front-rear direction. The cloth feeds 8 and 18 have serrated irregularities on the upper surface. The cloth feeds 8 and 18 slide in the cloth feed holes 10 and 11 in the front-rear direction. The cloth feeds 8 and 18 sandwich the cloth with a cloth presser (not shown) above the needle plate 1 during sewing, and reciprocate in the front-rear direction to feed the cloth. The cloth feed hole 10 has a substantially rectangular shape in plan view and penetrates in the vertical direction. The cloth feed hole 10 is formed in parallel with the longitudinal direction of the needle plate 1. The cloth feed hole 10 has a cut at one end in the longitudinal direction. The cloth feed hole 11 is symmetrical with the cloth feed hole 10 in plan view.

  As shown in FIGS. 2 and 3, the needle plate 1 includes a sawtooth uneven portion 77 on the surface around the cloth feed holes 10 and 11. The needle plate 1 is provided with a contact portion 7 on the lower surface on the left side of the cloth feed hole 10, with which an inner hook stopper 41 of the horizontal hook 2 described later comes into contact. The contact portion 7 protrudes from the lower surface of the needle plate 1. As shown in FIG. 4, the left end portion of the contact portion 7 is separated from the left end portion of the needle plate 1 to the right. The contact portion 7 includes a first contact portion 71 and a second contact portion 72 provided with a certain distance from the first contact portion 71. The first contact portion 71 and the second contact portion 72 are protrusions extending in parallel with the longitudinal direction of the cloth feed hole 10. Between the first contact part 71 and the second contact part 72, there is a gap 73 into which the inner hook stopper 41 enters. As shown in FIGS. 1, 2, and 4, the throat plate 1 has a contact portion 17 on the lower surface on the right side of the cloth feed hole 11, which abuts an inner hook stopper 141 of the horizontal hook 12 described later. Yes. The contact portion 17 has the same structure as the contact portion 7. As shown in FIG. 4, the abutment portion 17 is separated from the right end portion of the needle plate 1 to the left at the right end portion. As shown in FIG. 2, the contact portion 17 includes a first contact portion 171 and a second contact portion 172.

  As shown in FIG. 5, the second contact portion 72 includes a vertical wall 72A, an inclined surface 72B, a top portion 72C, and an inclined surface 72D. The vertical wall 72 </ b> A protrudes vertically downward from the lower surface of the needle plate 1. The slope 72B extends obliquely forward from the lower end of the vertical wall 72A downward. The top 72C extends horizontally from the lower end of the slope 72B with the lower surface of the needle plate 1. The slope 72D extends obliquely forward from the front end of the top portion 72C toward the lower surface of the needle plate 1. By providing the inclined surface 72B on the second contact portion 72, the contact area between the inner hook stopper 41, which will be described later, and the vertical wall 72A of the second contact portion 72 is reduced. The upper thread (not shown) can smoothly escape between the inner hook stopper 41 and the contact portion 7. The second contact portion 172 has a similar structure.

  Next, with reference to FIG.1 and FIG.6, the detail of the structure of the horizontal hook 2 is demonstrated. Hereinafter, the vertical direction of FIG. Since the structure of the horizontal hook 12 is the same as that of the horizontal hook 2, detailed description thereof is omitted.

  The horizontal hook 2 is located on the lower left side of the needle plate 1. The horizontal hook 2 is a hook that rotates on a horizontal plane. The horizontal hook 2 includes an outer hook 3, an inner hook 4, a hook shaft 34 that is a rotating shaft, and the like. The outer hook 3 rotates clockwise (in FIG. 1). The inner hook 4 is fitted into the outer hook 3 so as to be freely rotatable, and a bobbin 6 around which a lower thread is wound is mounted. The horizontal shuttle 12 is located on the lower right side of the needle plate 1. The horizontal hook 12 includes an outer hook 13 and an inner hook 14. The outer hook 13 rotates clockwise (in FIG. 1). The inner hook 14 is rotatably fitted in the outer hook 13 and is fitted with a bobbin 16 wound with a lower thread.

  The outer hook 3 is fixed to the upper end portion of the hook shaft 34 that rotates in synchronization with the lifting and lowering movement of a sewing needle (not shown). The outer hook 3 includes an inner hook storage portion 31, a race groove 35, a sword tip 32, a hook presser 33 and the like. The inner hook storage portion 31 is a bottomed cylindrical member that stores the inner hook 4. The inner hook storage portion 31 forms a race groove 35 along the inner circumferential direction. The race groove 35 is in contact with a race 45 of the inner hook 4 to be described later, and supports the inner hook 4 to be rotatable. The sword tip 32 protrudes from the outer peripheral portion of the outer hook 3 toward the rotation direction of the outer hook 3. The sword tip 32 captures the loop of the upper thread and rotates the outer periphery of the inner hook 4 to form a seam with the lower thread. The hook presser 33 is provided at the upper end of the outer hook 3 and presses the inner hook 4 from above.

  Next, the structure of the inner hook 4 will be described with reference to FIG. The inner hook 4 is a rotating body that fits into the inner hook housing portion 31 of the outer hook 3 so as to be rotatable independently of the outer hook 3. The inner hook 4 includes a bobbin storage part 47, an inner hook stopper 41, a bobbin support shaft 43, a bobbin presser 42, a lower thread hole 44, a race 45, an opener abutting part 46, and a lower thread groove 49. The inner hook 4 is a so-called latch-type hook that prevents the bobbin from falling off by pressing the bobbin with the bobbin presser 42 from above with the bobbin stored in the bobbin storage portion 47.

  The bobbin storage portion 47 has a bottomed cylindrical shape having an opening that is substantially circular in plan view and opens the bobbin 6 (see FIG. 1) around which a lower thread is wound. The bobbin support shaft 43 is erected in the center of the bobbin storage portion 47 and is inserted into a shaft hole (not shown) of the bobbin 6 to mount the bobbin 6 on the bobbin storage portion 47. The bobbin presser 42 is rotatably provided at the upper end portion of the bobbin support shaft 43. The bobbin presser 42 presses the bobbin 6 from above. A user rotates the bobbin presser 42 horizontally after inserting the bobbin 6 into the bobbin storage portion 47 to prevent the bobbin 6 from falling off. The tip of the bobbin presser 42 enters the outer peripheral surface notch 50 at the upper part of the outer peripheral surface of the inner hook 4 and constitutes a part of the outer peripheral wall.

  The inner hook stopper 41 is a plate-like protrusion that protrudes radially outward from the upper edge of the inner hook 4. The front end of the inner hook stopper 41 enters the gap 73 between the first contact portion 71 and the second contact portion 72 of the contact portion 7 (see FIG. 1) of the needle plate 1. Although the inner hook 4 is rotatably fitted to the outer hook 3, a force that rotates in the same direction as the rotation of the outer hook 3 is applied to the inner hook 4 due to the rotation of the outer hook 3. However, the front end portion of the inner hook stopper 41 protruding from the upper end of the outer peripheral surface of the inner hook 4 is the gap between the first contact portion 71 and the second contact portion 72 of the contact portion 7 of the needle plate 1. 73 enters the second abutting portion 72 to prevent the inner hook 4 from rotating. As shown in FIG. 8, in this embodiment, the front-end | tip part of the inner hook stop part 41 is extended to the opening edge part by the side of the horizontal hook 2 of the cloth feed hole 10. As shown in FIG. As shown in FIG. 9, the inner hook stopper 41 is inclined downward from the distal end portion toward the outer peripheral surface side of the inner hook 4.

  The opener contact portion 46 protrudes radially outward from the upper edge of the inner hook 4. The opener contact portion 46 is provided in the counterclockwise direction in plan view of the inner hook stopper 41. The opener contact portion 46 can contact an opener for rotating the inner hook 4 in a direction opposite to the rotation direction of the outer hook 3 to create a gap between the inner hook stopper 41 and the contact portion 7. . In the sewing machine according to the present embodiment, the opener abutting portion 46 is not used because the opener is not provided. The opener contact portion 46 may not be provided.

  As shown in FIG. 6, the race 45 projects along the outer peripheral surface with a constant height and a constant width from the center in the vertical direction of the outer peripheral surface of the inner hook 4 to the lower end side. The inner hook 4 has grooves 481 and 482 formed linearly in the vertical direction at both ends of the opener abutting portion 46 in the radial direction of the inner hook 4. As shown in FIG. 1, the inner hook 14 of the horizontal hook 12 has an inner hook stopper 141, a bobbin support shaft 143, a bobbin presser 142, a lower thread hole (not shown), and a race (not shown). The opener contact portion 146 and the lower thread groove (not shown) are provided to house the bobbin 16 around which the lower thread is wound. In the present embodiment, the distal end portion of the inner hook stopper 141 extends to the open end of the cloth feed hole 11 on the horizontal hook 12 side, similarly to the distal end portion of the inner hook stopper 41.

  The lower thread hole 44 is provided at a slightly upper center of the outer peripheral surface 48 of the inner hook 4 in the vertical direction. The lower thread hole 44 penetrates the inner peripheral surface of the inner hook 4. The lower thread hole 44 guides the lower thread pulled out from the bobbin stored in the bobbin storage section 47 to the outside of the inner hook 4. The lower thread groove 49 is a groove formed linearly from the lower thread hole 44 toward the upper edge of the inner hook 4. The lower thread groove 49 guides the lower thread to the lower thread hole 44. The position of the lower thread hole 44 is below the vicinity of the inner hook stopper 41 between the inner hook stopper 41 and the opener contact part 46.

  The user stores the bobbin around which the lower thread is wound in the bobbin storage portion 47 when the bobbin is stored in the inner hook 4. The user pulls out the lower thread from the bobbin and puts it out of the inner hook 4 through the groove 481. The user passes the lower thread taken out of the inner hook 4 between the outer peripheral surface 48 and the leaf spring 51 fixed to the outer peripheral surface 48. The leaf spring 51 applies a predetermined tension to the lower thread. The user passes the lower thread passed between the outer peripheral surface 48 and the leaf spring 51 from the groove 482 to the inside of the inner hook 4. The user passes the lower thread through the lower thread groove 49 and leads out from the lower thread hole 44. The sewing machine can store the bobbin in the inner hook 4.

  Next, the operation and effect of the inner hook 4 will be described with reference to FIGS. As shown in FIGS. 8 and 9, the distal end portion of the inner hook stopper 41 of the inner hook 4 extends to the opening end of the cloth feed hole 10 on the horizontal hook 2 side and comes into contact with the second contact portion 72. Accordingly, the inner hook stopper 41 of the inner hook 4 is longer than the inner hook stopper 241 of the inner hook 204 of the conventional horizontal hook 202 shown in FIGS. The abutting position between the inner hook stopper 41 and the second abutting section 72 is closer to the needle hole 81 side than the abutting position between the inner hook stopper 241 and the abutting section 207 of the prior art. Therefore, the angle θ1 formed by the upper thread 100 passing between the inner hook stopper 41 and the abutting portion 7 shown in FIG. 9 and the center line 101 of the needle hole 81 is equal to the conventional inner hook stopper shown in FIG. The upper thread 100 passing between 241 and the contact portion 7 is smaller than the angle θ2 formed with the center line 101 of the needle hole 81. The upper thread can pass through the needle hole 81 at an angle closer to perpendicular to the needle plate 1. As an example, the angle θ1 = 59 degrees and the angle θ2 = 68 degrees. Therefore, the upper thread 100 has a small resistance at the lower end position of the needle hole 81 when it is pulled up by the balance. The inner hook 4 can prevent the upper thread from being pulled up poorly by the balance. Therefore, the seam is not dirty, and the upper thread is not double-hooked by the sword tip 32.

  As shown in FIG. 9, the inner hook stopper 41 is inclined downward from the tip portion toward the outer peripheral surface side of the inner hook 4, so that the inner hook 4 side is thicker than the tip portion side. The strength of the inner hook stopper 41 increases in the vicinity of the base end position on the outer peripheral surface 48 side of the inner hook 4. Therefore, the sewing machine can prevent the inner hook stopper 41 from being damaged near the base end position on the outer peripheral surface 48 side of the inner hook 4 when the outer hook 3 rotates. Since the inner hook stopper 141 of the inner hook 14 is the same as the inner hook stopper 41 of the inner hook 4, the same action as described above compared to the inner hook 214 of the conventional horizontal hook 212 shown in FIG. There is an effect.

  Next, a second embodiment of the present invention will be described. With reference to FIG. 12, the throat plate 1 and the horizontal shuttles 20 and 120 disposed on the left and right of the throat plate 1 will be described. The sewing machine of the second embodiment is a two-needle sewing machine as in the first embodiment, and the horizontal shuttles 20, 120 are arranged at symmetrical positions on the left and right of the needle plate 1 having a rectangular shape in plan view. The structure of the throat plate 1 and the like other than the horizontal shuttles 20 and 120 is the same as that of the first embodiment, and thus the description thereof is omitted.

  Details of the structure of the horizontal hook 20 will be described with reference to FIGS. Hereinafter, the vertical direction of FIG. 13 is the vertical direction of the horizontal hook 20. Since the structure of the horizontal hook 120 is the same as that of the horizontal hook 20, detailed description thereof is omitted.

  The horizontal shuttle 20 is located on the lower left side of the needle plate 1. The horizontal hook 20 is a hook that rotates on a horizontal plane. The horizontal hook 20 includes an outer hook 3, an inner hook 80, a hook shaft 34, and the like. Since the outer hook 3 is the same as that of the said embodiment, detailed description is simplified. The inner hook 80 is attached with a cap 90 fitted with a bobbin (not shown) that is rotatably fitted in the outer hook 3 and wound with a lower thread. The horizontal shuttle 120 is located on the lower right side of the needle plate 1. The horizontal hook 120 includes an outer hook 13 and an inner hook 180. Since the outer hook 13 is the same as that of the said embodiment, detailed description is abbreviate | omitted. The inner hook 180 is fitted with a cap 190 fitted with a bobbin (not shown) in which the lower hook 13 is rotatably fitted and wound with a lower thread.

  In the outer hook 3, the inner pot accommodating portion 31 is the inside of the bottomed cylindrical shape that accommodates the inner pot 80. The race groove 35 formed in the inner hook storage portion 31 is in contact with the race 88 of the inner hook 80 and supports the inner hook 80 in a rotatable manner. The sword tip 32 of the outer hook 3 captures the loop of the upper thread and forms a seam with the lower thread by turning around the outer periphery of the inner hook 80. A hook presser 33 of the outer hook 3 is provided at the upper end portion of the outer hook 3 and presses the inner hook 80 from above.

  Next, the structure of the inner hook 80 will be described. The inner hook 80 is a rotating body that fits in the inner hook housing portion 31 of the outer hook 3 so as to be rotatable independently of the outer hook 3. The inner hook 80 includes a cap 90 that houses a bobbin (not shown) and an inner hook base 82 on which the cap 90 is mounted. The inner hook 80 is a so-called cap-type hook in which a cap 90 containing a bobbin is attached to the inner hook base 82 and the cap 90 is pushed from above by the cap 90 to prevent the bobbin from falling off.

  The inner hook base 82 includes a bobbin storage part 87, a side wall 83, a bobbin support shaft 85, a cap presser 86, an inner hook stopper 84, a race 88, and the like.

  The bobbin storage portion 87 has a substantially circular bottom surface in plan view that opens upward. The bobbin storage portion 87 has a bobbin support shaft 85 erected at the center of the bottom surface. The bobbin support shaft 85 is inserted into a shaft hole of a bobbin (not shown) and a bobbin and a cap 90 are attached. The cap presser 86 is rotatably provided at the upper end portion of the bobbin support shaft 85. The cap presser 86 presses the cap 90 from above. The side wall 83 is erected on the outer peripheral portion of the inner hook base 82. The user, after inserting the cap 90 containing the bobbin into the bobbin housing 87, rotates the cap presser 86 horizontally to prevent the cap 90 from falling off.

  The inner hook stopper 84 is a plate-like protrusion that protrudes radially outward from the upper edge of the side wall 83 of the inner hook 80. The inner hook stopper 84 enters the gap between the first contact portion 71 and the second contact portion 72 of the contact portion 7 of the needle plate 1 shown in FIG. Although the inner hook 80 is rotatably fitted to the outer hook 3, a force that rotates in the same direction as the rotation of the outer hook 3 acts on the inner hook 80 due to the rotation of the outer hook 3. However, the tip of the inner hook stopper 84 protruding from the upper end of the outer peripheral surface of the inner hook 80 is between the first and second contact portions 71 and 72 of the contact portion 7 of the needle plate 1. Enters the second abutment portion 72 and prevents the inner hook 80 from rotating. As shown in FIG. 12, in this embodiment, the front-end | tip part of the inner hook stop part 84 is extended to the opening edge part by the side of the horizontal hook 20 of the cloth feed hole 10. As shown in FIG. The shape of the inner hook stopper 84 is substantially the same as the shape of the inner hook stopper 41 of the above embodiment. The race 88 protrudes along the outer peripheral surface with a constant height and a constant width from the center in the vertical direction of the outer peripheral portion of the inner hook base 82 to the lower end side.

  The cap 90 is a dome-shaped cap having an opening below. The cap 90 includes an outer peripheral surface 91, a shaft hole 95, an opener contact portion 94, and a notch portion 96. The shaft hole 95 is a shaft hole through which the upper end portion of the bobbin support shaft 85 provided at the upper center of the cap 90 passes.

  The opener contact portion 94 protrudes radially outward from the upper edge of the cap 90. The opener abutting portion 94 is located in the counterclockwise direction in plan view of the inner hook stopper 84. The opener abutting portion 94 can abut on an opener for rotating the inner hook 80 in a direction opposite to the rotation direction of the outer hook 3 to create a gap between the inner hook stopper 84 and the abutting portion 7. . In the sewing machine of the second embodiment, the opener abutment portion 94 is not used because the opener is not provided. The opener contact portion 94 may not be provided. As shown in FIG. 12, the horizontal hook 120 includes an inner hook stopper 184, an inner hook 180, a bobbin support shaft 185, a cap presser 186, an opener abutting portion 194, and the like, similar to the horizontal hook 12. In the present embodiment, the leading end of the inner hook stopper 184 extends to the opening end of the cloth feed hole 11 on the horizontal hook 120 side, similarly to the tip of the inner hook stopper 84.

  The notch 96 is notched radially inward at the upper edge of the cap 90. The notch 96 is provided in the clockwise direction in plan view of the opener abutment 94. The notch 96 can be positioned when the bobbin is inserted into the bobbin housing 87 by fitting the upper end of the side wall 83.

  The user stores the bobbin in the cap 90 when the bobbin around which the lower thread is wound is stored in the inner hook 80. The user pulls out the lower thread from the bobbin and guides it to the outside of the cap 90 through a groove (not shown). The user passes the lower thread that has come out of the cap 90 between the outer peripheral surface 91 and the leaf spring 911 fixed to the outer peripheral surface 91. The leaf spring 911 applies a predetermined tension to the lower thread. The user aligns the notches 96 of the cap 90 with the side walls 83 of the inner hook base 82. The user fits the cap 90 into the bobbin storage portion 87. The sewing machine can store the bobbin stored in the cap 90 in the inner pot 80.

  As shown in FIG. 12, the inner hook 80 of the second embodiment is similar to the inner hook 4 of the first embodiment in that the tip of the inner hook stopper 84 is the open end of the cloth feed hole 10 on the horizontal hook 20 side. It extends to the part and contacts the second contact part 72. Accordingly, the upper thread passing between the inner hook stopper 84 and the contact portion 7 can pass through the needle hole 81 at an angle closer to the needle plate 1 at a more perpendicular angle. Therefore, the upper thread receives a small resistance at the lower end position of the needle hole 81 when it is pulled up by the balance. The inner hook 80 can prevent poor pulling of the upper thread due to the balance. The inner hook stopper 184 of the inner hook 180 has the same operation and effect as the inner hook stopper 84 of the inner hook 80.

  The cloth feed holes 10 and 11 in the above embodiment are examples of the “opening” in the present invention. The cloth feeds 8 and 18 are examples of the “feed unit” of the present invention. The vertical wall 72A is an example of the “contact wall” in the present invention. The inclined surface 72B is an example of the “inclined surface” in the present invention.

  The present invention is not limited to the above embodiment, and various modifications can be made. For example, the front end portion of the inner hook stopper 41 extends to the opening end of the cloth feed hole 10 on the horizontal hook 2 side. The distal end portion of the inner hook stopper 41 may extend to a position where it comes into contact with the contact portion 7. For example, the front end portion of the inner hook stopper 41 may extend to the end of the contact portion 7 on the cloth feed hole 10 side. In the above embodiment, the sewing machine has an opener for rotating the inner hooks 4, 80 in the direction opposite to the rotation direction of the outer hook 3 to create a gap between the inner hook stoppers 41, 84 and the contact portion 7. Not provided, but may be provided.

DESCRIPTION OF SYMBOLS 1 Needle plate 2 Horizontal hook 3 Outer hook 4 Inner hook 7 Contact part 12 Horizontal hook 13 Outer hook 14 Inner hook 17 Contact part 41 Inner hook stopper 71 First contact part 72 Second contact part 72A Vertical wall 72B Slope 72C Top 72D Slope 80 Inner hook 84 Inner hook stopper 90 Cap 141 Inner hook stopper 171 First abutting part 172 Second abutting part 180 Inner hook 184 Inner hook stopper

Claims (4)

A hook having an outer hook supported rotatably, and an inner hook supported rotatably relative to the outer hook inside the outer hook;
In a sewing machine comprising an opening on the outer peripheral surface of the inner hook and a needle plate facing the opening,
The needle plate includes a needle hole penetrating in a vertical direction so that a sewing needle passing through an upper thread can be inserted, and a contact portion projecting downward from the lower surface,
The hook includes an inner hook stopper that extends from the opening on the outer peripheral surface of the inner hook to the needle plate side and abuts against the contact portion to prevent the inner hook from rotating with the outer hook. ,
The contact portion is spaced from the hook side end of the needle plate to the needle hole side and is located between the hook side end and the needle hole side end of the needle plate,
The inner hook stopper is a sewing machine characterized in that a tip on the abutting portion abuts on the abutting portion. The needle plate is
A feeding section having the needle hole and feeding the work cloth;
And further comprising an opening that is slidable in the direction of feeding the work cloth.
The sewing machine according to claim 1, wherein the tip end portion extends to an edge on the hook side of the opening. The contact portion is
An abutting wall that abuts against the inner hook stopper when the outer hook rotates;
The sewing machine according to claim 1, further comprising an inclined surface that extends downward from a lower end portion of the contact wall in a direction away from the inner hook stopper.   The sewing machine according to any one of claims 1 to 3, wherein a lower end portion of the inner hook stopper portion is inclined downward from a tip portion on the contact portion side toward an outer peripheral surface side of the inner hook.

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