JP2015009148A - Horizontal rotary hook of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a horizontal rotary hook of a sewing machine.SOLUTION: According to the present invention, an outer hook is provided in a horizontal rotary hook of a sewing machine. An inner hook including a hook shaft is provided inside the outer hook. The inner hook is rotated around a shaft line with respect to the outer hook. An elastic component and a bobbin seat are fitted to the hook shaft in order. The bobbin seat is pushed by the elastic component located between the inner hook and the bobbin seat and is moved in the shaft line direction. A bobbin is provided outside the bobbin seat. The upper end of the hook shaft is pivotally connected with a hook shaft lock, and the hook shaft lock is rotatable between a locked position and an unlocked position. When the hook shaft lock is positioned at the locked position, both ends of the bobbin are held cooperatively by the hook shaft lock and the bobbin seat. On the side face of the hook shaft lock, a position restricting part is protruded. When the hook shaft lock is positioned at the unlocked position, the bobbin seat is elastically moved upward, and is locked and positioned by the position restricting part. Thus, when a user pushes a lock device of the rotary hook, the bobbin in the inside can be quickly and conveniently replaced. In addition, a rotary hook internal mechanism does not need to be precisely machined in size, and the total number of components can be reduced, so that production cost can be reduced.

Description

  The present invention relates to a kind of horizontal rotary hook used for sewing work, and more particularly to a horizontal rotary hook of a sewing machine having a kind of driven pop-up mechanism and capable of conveniently and quickly exchanging bobbins.

  Please refer to FIG. The traditional sewing machine rotary hook includes an outer hook (not shown), an inner hook 10, a conical spring 11, a bobbin 12, and a lock part 13. Among them, there is a hook shaft 101 inside the inner hook 10, and a conical spring 11 that gradually expands from the bottom to the top is provided around the hook shaft 101, and the conical spring 11 directly covers the bottom end of the bobbin 12. When the lock part 13 is turned from the horizontal locked state to the vertical unlocked state, the bobbin 12 pops upward from the inside of the inner hook 10. The purpose of the installation of the conical spring 11 is to provide frictional resistance, to prevent the bobbin 12 from slipping, and to make it easier for the user to remove the bobbin 12.

  However, the disadvantage of such a rotary hook is that only a single conical spring 11 is employed as a part for preventing the bobbin 12 from slipping, and the frictional force provided to the bobbin 12 is very stable. The conical spring 11 is held between the bobbin 12 and the inner hook 10 and has no other position limiting structure. Thus, after the bobbin 12 is removed, the conical spring 11 has no other position limiting means, so the conical spring 11 is often lost during the removal process. On top of that, there is a shortage, so there is another kind of rotating kettle design that can prevent the loss of parts.

  Please refer to FIG. The rotary hook that can prevent such parts from being lost includes an outer hook (not shown), an inner hook 20, a conical spring 21, a bobbin sheet 22, a non-slip elastic piece 23, a bobbin 24, and a lock part 25. Among them, there is a hook shaft 201 inside the inner hook 20, and a conical spring 21 that gradually expands from bottom to top is provided around the hook shaft 201, and the bottom of the bobbin sheet 22 is supported by the conical spring 21. The anti-slip elastic piece 23 and the bobbin 24 are fitted in order above the bobbin sheet 22, and the anti-slip elastic piece 23 supports the bottom of the bobbin 24 to prevent idling due to the inertia of the bobbin 24. .

  In such a rotary hook, the locking position limiting means is achieved by the fixing screw 26 around the bobbin sheet 22 and the inner hook 20, thereby preventing the bobbin sheet 22 and the conical spring 21 from being separated from the inner hook 20. . However, in general, the difference between the outer diameter of the bobbin 24 of the rotary hook and the inner diameter of the inner hook 20 is very small (that is, the gap between them is very small), and the flange outer diameter of the bobbin sheet 22 and the fixing screw 26 The protruding length must be between the above-mentioned differences, so that the bobbin seat 22 is locked and restricted by the fixing screw 26, and the bobbin 24 is smoothly popped upward in the inner hook 20 to fix the fixing screw. 26, so that the machining must be relatively precise due to the overall combination of parts. In addition, the non-slip elastic piece 23 is added to the inside of the rotary hook to provide a stable frictional resistance, but the number of rotary hook parts increases, and the entire horizontal rotary hook is manufactured. This leads to an increase in cost.

  A main object of the present invention is to provide a horizontal rotary hook of a sewing machine having a driven pop-up mechanism, which allows a user to quickly and conveniently replace the bobbin inside the rotary hook by turning a lock device. This will greatly increase the practicality and convenience of use of the rotary hook.

  Another object of the present invention is to reduce the number of parts of the pop-up mechanism inside the horizontal rotary hook, and to achieve the effect of restricting the locking position without requiring precise processing of the compression mechanism. The purpose is to reduce the manufacturing cost.

  In order to achieve the above object, the horizontal rotary hook of the sewing machine of the present invention includes an outer hook, an inner hook, a bobbin sheet, an elastic part, a hook shaft lock, and a bobbin. Among these, the above-mentioned inner hook is mounted inside the above-mentioned outer hook, and rotates with respect to the above-mentioned outer hook around the axis, and a hook shaft coaxial with the above-mentioned axis is provided. The above-described bobbin sheet is fitted to the above-described hook shaft, and includes a fitting shaft portion and an annular convex portion located at the bottom end of the above-described fitting shaft portion. The elastic part is positioned between the inner hook and the bobbin sheet, and is used to push the bobbin sheet and move it upward in the axial direction. The hook shaft lock is pivotally mounted on the hook shaft, and has a pivot end that is pivotally positioned by a pin on the hook shaft and a free end that is selectively swing-moved, and is provided on at least one side surface. The position restriction part is provided in a projecting manner. The above-described bobbin is fitted on the above-described bobbin sheet.

  The shuttle shaft lock of the present invention can be selectively turned to a locked position perpendicular to the above-mentioned axis or an unlocked position parallel to the above-mentioned axis. When the hook shaft lock is in the locked position, both ends of the bobbin are jointly held by the hook shaft lock and the bobbin seat. Among them, the bottom end of the above-described bobbin is supported by the above-mentioned ring convex portion, the above-mentioned bobbin upper end protrudes from the above-mentioned fitting tube upper surface, and is pressed when the above-mentioned hook shaft lock is in the lock position. In addition, when the hook shaft lock is in the unlocked position, the bobbin seat pops upward due to the action of the elastic parts, and is locked and positioned by the position restricting portion of the hook shaft lock. Is done.

  According to a preferred embodiment of the present invention, an annular groove is further provided at the bottom end of the above-mentioned annular convex portion, the above-mentioned elastic part is a conical spring that gradually decreases from bottom to top, and the above-mentioned conical shape. The upper ring portion of the spring is locked and positioned in the above-described annular groove.

  In addition, an attachment hole and a removal hole whose hole diameter is smaller than that of the above-mentioned pin are provided on each of the two back side surfaces of the fitting tube portion of the present invention, and the above-mentioned pin is inserted into the above-mentioned attachment hole, and the above-mentioned removal The hole is used to insert a tool and push the above-mentioned pin outward. Further, a recess is further provided on the rear edge of the hook shaft lock described above, which is convenient for the user to turn the hook shaft lock.

  The feature of the present invention is that the horizontal rotary hook is selectively turned to the locked position and the bobbin is subjected to joint position restriction by the hook shaft lock and the bobbin seat, or is set to the unlocked position by an elastic part. After the bobbin sheet is popped up, the bobbin sheet is locked and positioned by the position limiter of the hook shaft lock. Such a single elastic part design not only simplifies the overall design of the rotary hook, but also makes the bobbin seat independent of precision machining by engaging the bobbin seat with the hook shaft lock. The effect of limiting the pop-up height of the horizontal rotary hook can be achieved, the manufacturing cost of the horizontal rotary hook can be greatly reduced, and the loss of the internal parts of the horizontal rotary hook can be prevented when replacing the bobbin.

It is sectional drawing of the horizontal rotary hook of a well-known sewing machine. It is sectional drawing of the horizontal rotary hook of another known sewing machine. It is an exploded view of the horizontal rotary hook of the sewing machine of the present invention. It is sectional drawing at the time of the locked state of the horizontal rotary hook of this invention. It is a cross-sectional enlarged view of the horizontal rotary hook of FIG. It is sectional drawing when a bobbin pops up in the unlocked state of the horizontal rotary hook of this invention. It is sectional drawing at the time of the pin attachment of the horizontal rotary hook of this invention. It is sectional drawing at the time of pin removal of the horizontal rotary hook of this invention.

  The technical contents, structural features, objects to be achieved, and operational effects of the present invention will be described in detail below with reference to examples and drawings.

  Please refer to FIG. The horizontal rotary hook 30 of the present invention rotates around an axis 40 and includes an outer hook 31, an inner hook 32, a bobbin sheet 33, an elastic part 34, a hook shaft lock 35 and a bobbin 36. The outer hook 31 includes a hook body 311, and a storage space 312 for receiving the inner hook 32 is defined inside the hook body 311, and a sewing machine drive shaft ( (Not shown) is inserted and fixed.

  The inner hook 32 is rotatably mounted in the accommodation space 312 of the outer pot 31 and is provided with an annular cup body 321, and is coaxial with the axis 40 at the center of the annular cup body 321. The hollow hook shaft 322 is formed, thereby forming an annular groove 323 in the above-mentioned annular cup body 321, and the fitting groove 324 is provided in the upper part of the above-described hook shaft 322 so as to be downwardly formed. A pin hole 325 that penetrates the hook shaft 322 is provided on each side of the fitting groove 324, and a spring 326 and a support component 327 positioned at the upper end of the spring 326 are provided inside the hook shaft 322.

  In addition, the contact surface between the outer hook 31 and the inner hook 32 has a track combined with each other, and a concave track 313 is provided on the inner wall of the outer hook 31. A convex track 328 is provided around the periphery, so that the outer hook 31 can be slidably rotated with respect to the inner hook 32.

  The above-described bobbin sheet 33 is fitted onto the above-described hook shaft 322, and is located on the fitting tube portion 331 adjacent to the above-described hook shaft 322 and the bottom end of the above-described fitting tube portion 331 and is extended outward. An annular groove 333 is provided at the bottom edge of the bottom end of the annular protrusion 332, and an interval space 334 is formed between the annular protrusion 332 and the wall surface of the annular cup 321. It is formed. In addition, an attachment hole 335 and a removal hole 336 are respectively provided on the two opposite side surfaces of the fitting tube portion 331 described above.

  Please refer to FIG. Similarly, the elastic part 34 is fitted on the hook shaft 322, and is interposed between the inner hook 32 and the bobbin sheet 33, and pushes the bobbin sheet 33 in the direction of the axis 40. Used to move vertically.

  In the preferred embodiment shown, the elastic component 34 is a conical spring 341 that gradually contracts from bottom to top, and the relatively large first ring 342 at the bottom of the conical spring 341 is the annular shape described above. A relatively small second ring portion 343 that holds the bottom surface of the cup 321 and is above the above-described conical spring 341 is fitted in the above-described annular groove 333. Among these, when the above-mentioned conical spring 341 is subjected to pressure, the above-mentioned conical spring 341 is deformed to be in a flat state, and thus the above-described bobbin sheet 33 is processed to approach the inner bottom surface of the above-mentioned annular cup 321.

  The hook shaft lock 35 includes a pivot end 350 assembled to the upper portion of the hook shaft 322 and a free end 351 that selectively swings and moves, and at least between the pivot end 350 and the free end 351. On one side, a position limiter 352 is installed, the above-mentioned pivot end 350 includes a pivot hole 353, and a pin 354 is inserted into the above-mentioned two pin holes 325 and pivot hole 353, thereby the above-mentioned The hook shaft lock 35 and the hook shaft 322 are pivotally connected to each other, and the above-mentioned free end 351 includes a threading groove 355 formed in a hook-like structure and a recess 356 that is convenient for the user to turn (see FIG. 6).

  Please refer to FIG. The pivot end 350 includes a first contact surface 357 that contacts the support component 327 and a second contact surface 358 that is substantially perpendicular to the first contact surface 357, as illustrated. When the first contact surface 357 and the above-described support component 327 come into contact with each other, the above-described hook shaft lock 35 is perpendicular to the above-described axis 40 and forms a locked state.

  See FIG. When the above-described second contact surface 358 and the above-described support component 327 are in contact with each other, the above-described hook shaft lock 35 is parallel to the above-described axis 40 to form an unlocked state, and thus the hook shaft lock 35 is in the locked position. Switch positions between unlocked positions.

  The above-described bobbin 36 includes a cylinder 361 that is fitted to the above-described fitting tube portion 331, and an upper flange 362 and a lower flange 363 are extended horizontally from the upper and lower ends of the above-described cylinder 361, respectively. The bobbin 36 forms a thread accommodation groove 364 for accommodating the thread.

  In addition, the size of the bobbin 36 of the sewing machine generally has a common standard, and the bobbin 36 of the present invention is attached to the shuttle shaft 322 by the above-described bobbin sheet 33. The outer diameter of the hook shaft 101 is the same as the outer diameter size of the fitting tube portion 331 of the bobbin sheet 33 of the present invention, and the outer diameter of the hook shaft 322 of the present invention is smaller than the outer diameter of the known hook shaft 101. .

  The present invention is characterized in that the above-described bobbin seat 33 and the hook shaft lock 35 jointly form a gripping means for preventing the above-described bobbin 36 from idling, and in addition, the above-described elastic part 34 and the hook shaft lock 35 are jointly formed. Therefore, the above-described locking means for limiting the position of the pop-up of the bobbin sheet 33 is formed.

  Among them, the so-called gripping means is such that when the hook shaft lock 35 is selectively rotated to reach a lock position perpendicular to the axis 40, the upper flange 362 and the lower flange 363 of the bobbin 36 are respectively This means that the joint holding position of the hook shaft lock 35 and the bobbin sheet 33 is restricted. Please refer to FIG. In the preferred embodiment shown, the lower flange 363 of the bobbin 36 is supported on the upper surface of the annular projection 332, and the upper end of the bobbin 36 protrudes from the upper surface of the fitting tube portion 331. The shaft lock 35 is supported when it is in the locked position to prevent idling of the bobbin 36.

  In the so-called locking means, the hook shaft lock 35 is selectively rotated to be in an unlock position parallel to the axis 40, and the bobbin sheet 33 is acted upward by the action of the elastic component 34. After popping up and reaching the set altitude, the upper surface thereof is locked and positioned by the position restricting portions 352 on the both side surfaces of the hook shaft lock 35, and the bobbin sheet 33 and the elastic part 34 are detached from the inner hook 32. Thus, the internal parts of the horizontal rotary hook 30 are prevented from being lost.

  Please refer to FIG. When the horizontal rotary hook 30 of the present invention is assembled, the above-described bobbin sheet 33 must be subjected to restriction of the pressing position of the above-described elastic part 34 and hook shaft lock 35, whereby the above-described pin 354 is attached to the present invention. When the height of the mounting hole 335 of the bobbin sheet 33 is adjusted, the mounting hole 335 is aligned with the two pin holes 325 and the pivot hole 353, and the pin 354 is The above-mentioned pin 354 is fixedly pivoted between the above-mentioned two pin holes 325 and the pivot hole 353.

  Please refer to FIG. In addition, when the user wants to remove the pin 354 described above, the user aligns the height of the mounting hole 335 with the two pin holes 325 and the pivot hole 353 described above. The pin 354 is inserted into the removal hole 336 smaller than the pin 354, and the above-described pin 354 is pushed by the above-described tool 50, so that the above-described pin 354 is pushed outward from the above-described attachment hole 335.

  Overall, the bobbin of the horizontal rotary hook of the present invention has been replaced by a design of a non-slip elastic piece compared to a traditional rotary hook due to the joint position limitation of the hook shaft lock and the bobbin seat. In addition, after the elastic parts pop up the bobbin sheet, the present invention can be locked by the position limiter of the hook shaft lock to improve the problem that the bobbin sheet and elastic parts inside the rotary hook are easily lost. Since the bobbin sheet does not need to be locked in contact with the fixing screw, it improves the bobbin sheet processing problem of positioning accurately by combining the fixing screw in the unlock pop-up state of known technology, greatly The manufacturing cost of the horizontal rotary hook can be reduced.

  The foregoing is only a description of the preferred embodiment of the present invention, and is not intended to limit the present invention. Other equivalent effect modifications or substitutions that may be accomplished without departing from the spirit of the present invention are not Are also within the scope of the claims of the present invention.

[Known technology]
10 inner hook 101 hook shaft 11 conical spring 12 bobbin 13 lock part 20 inner hook 201 hook shaft 21 conical spring 22 bobbin seat 23 non-slip elastic piece 24 bobbin 25 lock part 26 fixing screw [present invention]
30 Horizontal rotary hook 31 Outer hook 311 Hook body 312 Housing space 313 Recessed track 32 Inner hook 321 Ring cup 322 Hook shaft 323 Ring groove 324 Fitting groove 325 Pin hole 326 Spring 327 Supporting part 328 Convex track 33 Bobbin sheet 331 Fitting tube portion 332 Annular convex portion 333 Annular groove 334 Interval space 335 Attachment hole 336 Removal hole 34 Elastic part 341 Conical spring 342 First annular portion 343 Second annular portion 35 Hook shaft lock 350 Pivot end 351 Free end 352 Position restriction portion 353 Pivoting hole 354 Pin 355 Threading groove 356 Recess 357 First contact surface 358 Second contact surface 36 Bobbin 361 Cylinder 362 Upper flange 363 Lower flange 364 Thread receiving groove 40 Axis 50 Tool

Claims (7)

In the horizontal rotary hook of the sewing machine,
An outer pot,
The inner hook, which is attached to the inside of the outer hook and rotates with respect to the outer hook about the axis, and is provided with a hook shaft;
A bobbin sheet fitted on the hook shaft,
An elastic part that is interposed between the inner hook and the bobbin sheet, and pushes the bobbin sheet to move upward in the direction of the axis; and
A hook shaft lock, wherein the hook shaft lock is pivotally mounted on the above-described hook shaft, and at least one side surface is provided with a position restriction portion projecting;
A bobbin fitted to the above-described bobbin sheet;
The hook shaft lock is selectively turned to reach the lock position perpendicular to the axis line or to the unlock position parallel to the axis line, and the hook shaft lock is moved to the lock position. When positioned, both ends of the bobbin receive joint clamping of the hook shaft lock and the bobbin seat, respectively, and when the hook shaft lock is in the unlocked position, the bobbin seat A horizontal rotary hook of a sewing machine that pops up under the action of an elastic part and is locked and positioned by the position limiter of the hook shaft lock described above.   The horizontal rotary hook of the sewing machine according to claim 1, wherein the bobbin sheet includes a fitting tube portion and an annular convex portion located at a bottom end of the fitting tube portion. Kettle.   3. The horizontal rotary hook of the sewing machine according to claim 2, wherein the bottom end of the bobbin supports the ring convex part, and the upper end of the bobbin protrudes from the upper surface of the fitting tube part to lock the hook shaft lock. A horizontal rotary hook of a sewing machine, wherein the sewing machine is pressed when the lock is in a locked position.   The horizontal rotary hook of the sewing machine according to claim 2, wherein an annular kerf provided for locking the upper part of the elastic part is further provided at the bottom end of the ring convex part. Horizontal rotary hook.   The horizontal rotary hook of the sewing machine according to claim 2, wherein an attachment hole and a removal hole are respectively provided on two back side surfaces of the fitting tube portion, a pin is passed through the attachment hole, A horizontal rotary hook of a sewing machine characterized in that the hole diameter is smaller than that of the above-mentioned pin, and the tool is inserted to push the above-mentioned pin and push the above-mentioned pin outward from the above-mentioned mounting hole.   2. The horizontal rotary hook of the sewing machine according to claim 1, wherein the elastic part is a conical spring that gradually contracts from bottom to top.   2. The horizontal rotary hook for a sewing machine according to claim 1, wherein the hook shaft lock is further provided with a concave portion that is convenient for a user to turn.

Images