JP3490956B2 - Vertical full rotation of the sewing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical full rotation kettle provided on a lockstitch sewing machine or a zigzag sewing machine. 2. Description of the Related Art During sewing by a full-rotation stove, an upper thread loop passes through a thread pull-out portion of a rail formed in an inner stitch, and forms a gap between the inner stitch-stopping recess and the inner stitch-stop member. In passing through the gap and forming a seam, the upper thread needs to smoothly pass through the thread pull-out portion, otherwise, the tension of the upper thread changes and an accurate seam cannot be formed. In the prior art, there is no contrivance for stabilizing the tension acting on the upper thread when the upper thread loop passes through the thread release section. [0003] An object of the present invention is to provide an undesired upper thread when an upper thread loop passes through a thread dropout of a rail formed in an inner hook during sewing. It is an object of the present invention to provide a vertical full rotation kettle of a sewing machine capable of forming an accurate seam without causing a change in tension. According to the present invention, the outer hook is rotated around the axis 9 of the outer hook while the inner hook rail is fitted in the outer hook rail groove. In the vertical full rotation of the sewing machine, (a) a storage recess 31 extending in the radial direction near the thread pull-out portion 19 is formed in the rail, and (b) a straight cylindrical metal stored in the storage recess 31. A roller 28 having an axis parallel to the axis 9 of the outer cage in an imaginary plane including the axis 9 of the outer cage, and being rotatable in the storage recess 31 around the axis of the roller; And (c) a metal leaf spring 29 that is curved in a U-shape and resiliently applies a spring force to the roller 28 radially outward of the inner hook. (D) In the storage recess 31 The radially outer end face 32 of the inner kettle 2 has an inner diameter smaller than the outer diameter of the rollers 28. (E) The rollers protrude outwardly from the radially outer peripheral surface of the rail, and resiliently contact the bottom surface 7a of the rail groove 7 by the leaf spring 29. Up to full vertical rotation of the sewing machine. According to the present invention, the rollers protrude from the outer peripheral surface of the rail formed in the inner hook so as to come into contact with the bottom surface of the outer groove of the outer rail. Therefore, the tension acting on the upper thread loop is prevented from changing unstably when the upper thread loop passes through the thread pull-out portion. This will ensure that the seam is accurately formed. FIG. 1 is a vertical full-rotation kettle 1 according to an embodiment of the present invention. FIG. 2 is a plan view of the inner kettle 2 included in FIG. 2, FIG. 2 is a longitudinal sectional view of the vertical full rotation kettle 1, and FIG. A rail 5 extending in the circumferential direction is formed on the outer peripheral surface of the cylindrical portion 4 having the bottom 3 of the inner kettle 2. The rail 5 is fitted into the rail groove 7 of the outer furnace 6, and the outer furnace 6 is driven to rotate around the horizontal axis 9 at a high speed by the lower shaft 8. A stud 21 coaxial with the axis 9 is erected on the inner kettle 2.
The bobbin 22 around which the lower thread is wound is rotatably fitted.
The bobbin 22 is housed in a bobbin case 23,
Attached to A detent recess 11 is formed in the inner kettle 2. The convex portion 13 of the inner lock member 12 fixed to the machine body of the sewing machine fits into the detent recess 11. Thus, when the outer hook 6 is driven to rotate in the direction of the arrow A1, the inner hook 2 is prevented from rotating. During sewing, the needle 14 is reciprocated up and down, and the needle 14 is inserted into the needle drop hole 15 of the inner hook 2. The needle thread 16 passed through the needle 14 is attached to a sword tip 17 provided on the outer kettle 6.
Caught by As the outer hook 6 rotates downstream of the arrow A1, the upper thread T caught by the sword 17 is:
Engage with the thread dividing portion 18 of the rail 5 to form a needle thread loop,
It passes through the thread pull-out portion 19 while sliding on the outer peripheral surfaces of the cylindrical portion 4 and the bottom portion 3 of the inner kettle 2, and further moves through the gap between the detent groove 11 and the convex portion 13 of the detent member 12. , Seams are formed. FIG. 4 is a partial cross-sectional view taken along section line IV-IV in FIG. A resilient piece 27 is provided to protrude outward from a radially outer peripheral surface 26 of the rail 5. The resilient piece 27 includes a contact member 28 that is a right cylindrical roller and a spring 29 that resiliently applies a spring force to the contact member 28 radially outward (upper in FIG. 4) of the inner hook 2. Including. The spring 29 is a metal leaf spring. The leaf spring 29 has a U-shaped curved configuration. The contact member 28 is made of metal. The contact member 28 resiliently contacts the bottom surface 7a of the rail groove 7 in the state of the imaginary line 28a. As a result, the upper thread loop passes smoothly through the thread pull-out portion 19 through the gap between the rail 5 and the rail groove 7, and an accurate stitch is formed. The rail 5 of the inner kettle 2 has a thread pull-out portion 19.
In the vicinity, a storage recess 31 extending in the radial direction is formed.
A part of the contact member 28 and the spring 2
9 are stored. The radially outer end 32 of the inner kettle 2 in the storage recess 31 is plastically deformed so as to have an inner diameter smaller than the outer diameter of the contact member 28, whereby the contact member 28 is moved inward from the storage recess 31. The escape of the kettle 2 to the outside in the radial direction is prevented. FIG. 5 shows another embodiment of the present invention.
6 is a partial cross-sectional view taken along the line VI-VI in FIG. The embodiment shown by FIGS. 5 and 6 is similar to the embodiment of FIGS. 1 to 4 described above, and corresponding parts are denoted by the same reference numerals. The contact member 28 of the resilient piece 27 protrudes from the outer surface 5b on the bottom 3 side (left side in FIGS. 5 and 6) of the rail 5 to the bottom 3 side, and the inner surface 7b of the rail groove 7 on the bottom 3 side. Contact. Contact member 2
When the contact member 8 is in contact with the inner side surface 7b, the contact member 28 partially enters the storage recess 31 by the spring 29 in the state of the imaginary line 28b. Other configurations are the same as those of the above-described embodiment. Also in the embodiment shown in FIGS. 5 and 6, the upper thread loop can pass through the vicinity of the thread pull-out portion 19 of the rail 5 without a large change in tension. FIG. 7 is a plan view of an inner kettle 2 according to still another embodiment of the present invention, and FIG.
FIG. 8 is a partial cross-sectional view as viewed from -VIII. This embodiment is similar to the above-described embodiment, and corresponding parts are denoted by the same reference numerals. The contact member 28 of the resilient piece 27 is opened by the spring 29 at the open end (in FIG.
And the contact member 28 protrudes toward the open end (the right side in FIGS. 7 and 8) of the rail groove 7.
Makes elastic contact with The contact member 28 is the inner surface 7 of the rail groove 7.
The state of resilient contact with c is indicated by reference numeral 28c. The contact member 28 is a right cylindrical roller in the above-described embodiment, and is in contact with the bottom surface 7a and the inner side surfaces 7b and 7c of the rail groove 7 and is stored when the outer kettle 3 rotates. The contact member 2 rotates in the recess 31.
The frictional force between 8 and the track groove 7 is reduced. The axis of the contact member 28 that is a roller is parallel to the axis 9 in an imaginary plane including the axis 9 of the outer kettle 6. Since the contact member 28 is a roller, a stable contact state with the inner surface of the rail groove can be maintained. As described above, according to the present invention, the bottom surface 17a of the rail groove protrudes from the outer peripheral surface of the rail near the thread pull-out portion of the rail in which the rollers are formed in the inner hook. Resiliently, there is no possibility that an undesired change in tension occurs in the upper thread loop, and a stable tension can be applied to the upper thread loop. , And smoothly pass between the inner bite-stopping recess and the detent member to form an accurate seam. Also, there is no occurrence of thread balls.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of an inner kettle 2 included in a vertical full rotation kettle 1 according to an embodiment of the present invention. FIG. 2 is a vertical cross-sectional view of the vertical full rotation kettle 1; FIG. 3 is a front view of the inner hook 2; FIG. 4 is a partial cross-sectional view taken along line IV-IV in FIG. 1; FIG. 5 is a plan view of an inner hook 2 according to another embodiment of the present invention. FIG. 6 is a partial cross-sectional view taken along section line VI-VI in FIG. 5; FIG. 7 is a plan view of an inner hook 2 according to still another embodiment of the present invention. FIG. 8 is a sectional view taken along section line VIII-VIII in FIG. 7; [Description of Signs] 1 Vertical full rotation hook 2 Inner hook 3 Bottom 4 Tube section 5 Rail 6 Outer hook 7 Rail groove 8 Lower shaft 11 Detent recess 12 Inner hook detent member 16 Upper thread 17 Sword point 18 Thread splitting section 19 Thread removal portion 22 Bobbin 23 Bobbin case 27 Resilient piece 28 Contact member 29 Spring

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Claims (1)

(57) [Claims] [Claim 1] A sewing machine which is driven to rotate around an axis 9 of the outer hook while the inner hook rail is fitted in the outer hook rail groove. In the vertical full rotation kettle, (a) a storage recess 31 extending in the radial direction is formed in the rail near the thread pull-out portion 19, and (b) a straight cylindrical metal roller stored in the storage recess 31. 28, a roller having an axis parallel to the axis 9 of the outer barrel in a virtual plane including the axis 9 of the outer barrel, and being rotatable about the axis of the roller in the storage recess 31. (C) a metal leaf spring 29 that is curved in a U-shape and resiliently applies a spring force to the roller 28 radially outward of the inner hook; and (d) an inner hook in the storage recess 31. 2 is plastically deformed so that the radially outer end face 32 has an inner diameter smaller than the outer diameter of the rollers 28. (E) The sewing machine is characterized in that the rollers protrude outward from an outer peripheral surface radially outward of the rail, and resiliently contact the bottom surface 7a of the rail groove 7 by the leaf spring 29. Vertical full rotation bite.