WO2018131169A1

WO2018131169A1 - Airflow generator

Info

Publication number: WO2018131169A1
Application number: PCT/JP2017/001284
Authority: WO
Inventors: 潤畑中
Original assignee: 株式会社広瀬製作所
Priority date: 2017-01-16
Filing date: 2017-01-16
Publication date: 2018-07-19

Abstract

Provided is an airflow generator that is capable of easily adding a cooling function to an existing full rotary shuttle. This airflow generator (50) is used for a full rotary shuttle which includes: an outer shuttle (21) that has an outer shuttle body (24) which has a bottom (29) provided with an opening that faces external space; an inner shuttle (23) that is accommodated inside the outer shuttle body (24) in a state of being held against rotating coaxially about the axis of rotation (L) of the outer shuttle (21); and a drive shaft (18) that is connected to the outer shuttle body (24) and causes the outer shuttle (21) to be driven about the axis of rotation (L), wherein the outer shuttle (21) has a boss part (30) that connects the drive shaft (18) to the outer shuttle body (24). The airflow generator (50) is characterized by having a base part that fits into the boss part (30) and a first blade (63) provided connected to the base part and facing the opening, and is characterized in that an airflow that flows through the opening of the outer shuttle body (24) is generated when the drive shaft (18) causes the outer shuttle (21) to be driven about the axis of rotation (L).

Description

Airflow generator

The present invention relates to an airflow generator used for a full rotation rotary hook of a sewing machine.

Conventionally, in a full rotation rotary hook provided with an outer rotary hook and an inner rotary hook, lubricating oil has been applied to the sliding portion in order to prevent the sliding portion between the outer rotary hook rail groove and the inner rotary hook rail from becoming hot. A technique for supplying and suppressing temperature rise due to friction of the sliding portion is known.

Moreover, as a prior art which suppresses the temperature rise of a full rotation hook, for example, in patent document 1, it suppresses that a rail groove of an outer rotary hook and a rail of an inner rotary hook slide, and a full rotation rotary hook becomes high temperature. For this purpose, a plurality of air passages that penetrate the peripheral wall of the outer hood are provided in the outer hood in which the inner hood is stored, and hot air in the outer hood is discharged from the air passage to the external space, or externally. Is introduced from the air passage into the outer cage.

JP2015-156910A

In the invention described in Patent Document 1, if it is attempted to carry out an existing outer hook, it takes time and effort to form a plurality of air passages in the outer hook. In addition, if an air passage is formed in an existing outer shuttle, the center of gravity position of the outer shuttle may move and vibration may occur, so processing to offset the movement of the center of gravity due to the air passage is necessary. In order to exhaust the high-temperature air in the outer hook to the external space, it is not possible to simply form an air passage in the outer hook assembled to the sewing machine.

An object of the present invention is to provide an airflow generator that can easily add a cooling function to an existing full-rotation rotary hook.

The airflow generator according to the present invention has an outer bite having an outer bite body in which a rail groove is formed on the inner periphery and an opening facing the external space is provided on the bottom.
An inner rail which has a rail on the outer peripheral portion, is fitted in the rail groove, and is stored inside the outer hook main body on the same axis as the rotation axis of the outer hook. Bitten,
A drive shaft connected to the outer race main body and driving the outer race around the rotation axis, and the outer race has a boss portion that connects the drive shaft to the outer race main body. An airflow generator used,
A base that fits into the boss,
A first blade that is connected to the base and faces the opening;
The drive shaft is driven around the rotational axis of the outer hook to generate an airflow that flows through the opening of the outer hook body.

Further, the present invention includes a second blade that is connected to the base portion and adjacent to the first blade, and generates an airflow in the rotation axis direction at a tip portion of the boss portion. It is characterized by.

Further, the present invention is characterized in that the base is formed in an elastically deformable C-shape and is detachable along the radius of the boss.

According to the airflow generator of the present invention, it is easily mounted on the full rotation kiln, and an airflow is generated between the internal space and the external space of the full rotation kiln to suppress the full rotation kiln from becoming high temperature. be able to.

Further, according to the airflow generator of the present invention, since the airflow in the rotation axis direction is generated at the tip of the boss portion, it becomes easy to generate airflow between the internal space and the external space of the rotary kiln.

Further, according to the airflow generator of the present invention, the airflow generator can be retrofitted to the boss portion with the outer hook connected to the drive shaft, and can be easily retrofitted to the sewing machine being used. it can.

It is a top view of the perpendicular | vertical full rotation rotary hook with which the airflow generation tool of 1st Embodiment of this invention was mounted | worn. It is CC sectional drawing. It is a front view of the outer bite main body with which the airflow generation tool was mounted | worn. It is the front view seen from the arrow D of FIG. It is the bottom view seen from the arrow E of FIG. It is a top view of an airflow generation tool. It is the front view which looked at the airflow generation tool from the arrow F of FIG. It is sectional drawing which looked at the airflow generation tool from the cut surface line GG of FIG. It is a figure which shows the flow of the air which generate | occur | produces with an airflow generation tool. It is a front view of the vertical full rotation rotary hook which has a shaft part. It is sectional drawing seen from the cut surface line JJ of the vertical all rotation hook which has an axial part. It is a figure which shows the flow of the air inside the airflow generation tool which concerns on 2nd Embodiment. It is a top view of the airflow generation tool which concerns on 3rd Embodiment. It is the front view seen from the arrow H of FIG. It is the front view seen from the arrow I of FIG.

The airflow generator 50 according to the first embodiment will be described. FIG. 1 is a plan view of a vertical all-rotation rotary hook equipped with an airflow generator 50 according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the section line CC of FIG. FIG. 3 is a plan view of the outer hook body 24 to which the airflow generator 50 is attached. 4 is a front view seen from the arrow D of FIG. 3, and FIG. 5 is a bottom view seen from the arrow E of FIG.

The vertical full rotation hook 20 to which the airflow generator 50 is attached is suitably implemented for high speed zigzag stitching, for example. The vertical full rotation hook 20 basically includes an outer hook 21, an inner hook 23 housed and held in the outer hook 21 from the opening end 22 side, and a bobbin case (not shown) mounted on the inner hook 23. And a bobbin around which a lower thread is wound and accommodated in a bobbin case.

The outer hook 21 includes a stainless steel outer hook body 24, and the outer hook main body 24 has an inner hook holding member 25 made of stainless steel. The inner hook pressing member 25 is screwed to the outer hook main body 24 by screws 26. The outer hook 21 is provided in the machine body of the sewing machine, and is detachably fixed to the driving shaft 18 that is a lower shaft that rotates around the rotation axis L by a mounting bolt 30a, and is connected to the bottom 29 of the outer hook main body 24. And has a boss portion 30 for attaching the outer shuttle body 24 to the drive shaft 18.

A sword tip 31 is provided on the outer periphery of the outer hook main body 24 on the opening end 22 side, and the inner hook presser member 25 is closer to the opening end 22 than the tip 32 of the sword tip 31, and the rotation axis L of the outer hook main body 24. It is fixed on a plane 34 extending in a direction perpendicular to. A rail 37 formed on the outer periphery of the inner hook 23 is fitted in the rail groove 36 formed by the outer hook main body 24 and the inner hook pressing member 25, and the inner hook 23 is provided on the machine body of the sewing machine by an inner hook stopper member (not shown). The outer hook 21 is rotationally driven in a state where the rotation of the hook 23 is blocked.

The boss portion 30 has a central axis on the rotation axis L and is provided with a notch surface 39 extending to the plane 34. A bottom opening 41 that is defined by the notch surface 39 and the peripheral wall 40 of the outer hook body 21 and faces the external space is formed in the bottom 29 of the outer hook body 21. A peripheral wall side opening 70 that is continuous with the bottom opening 41 is formed in the peripheral wall 40 of the outer rack main body 24 at a portion where the bottom opening 41 is formed.

FIG. 6 is a plan view of the airflow generator 50, and FIG. 7 is a front view of the airflow generator 50 as viewed from the direction F of FIG. FIG. 8 is a cross-sectional view of the airflow generator 50 as seen from the section line GG of FIG. FIG. 9 is a view showing the flow of air generated by the airflow generator 50. The material of the airflow generator 50 is not particularly limited as long as it has oil resistance, and an inexpensive material such as nylon 12 can be used. The airflow generation tool 50 can be integrally formed using, for example, a 3D printer, or can be formed by bonding individually created bases and blades.

The airflow generator 50 has a first base 51 and a second base 52 that are cylindrical peripheral walls with the rotation axis L as the central axis. The first base 51 and the second base 52 are positioned adjacent to each other in the direction of the rotation axis L. In the air flow generator 50, one end surface 69 of the second base 52 abuts the bottom surface 48 of the outer rack body 21. Are arranged as follows.

The outer diameter D <b> 1 of the first base 51 is smaller than the outer diameter D <b> 2 of the second base 52, and the length t <b> 1 of the first base 51 in the rotation axis L direction is the rotation axis L of the second base 52. It is formed larger than the length t2 in the direction. A first side opening 56 is formed on one side end surface 55 of the first base 51, and a second side opening 58 is formed on the other side end surface 57 of the first base 51. One side opening 67 is formed on one end surface 69 of the second base 52, and the other side opening 60 is formed on the other end surface 59 of the second base 52. The one side opening 56 of the first base 51 and the other side opening 60 of the second base 52 are positioned so as to overlap each other.

Two adjacent first blades 63 and four second blades 64 are provided so as to be continuous with the inner surface of the first base portion 51 and the inner surface of the second base portion 52. The two first blades 63 and the four second blades 64 are arranged at equal angles in the circumferential direction on the inner surface of the first base 51 and the inner surface of the second base 52.

The two first blades 63 are integrally formed so that one side faces the bottom opening 41 and the other side faces the other opening 58 of the first base 51 and the other opening 60 of the second base 52. The four second blades 64 are integrally formed so that one side faces the one side opening 67 of the second base 52 and the other side faces the other side opening 58 of the first base 51 and the other side opening 60 of the second base 52. Has been.

In a state where the airflow generator 50 is mounted on the boss portion 30, the first blade 63 is located from the bottom opening 41 of the outer rack body 24 to the end face 65 of the boss portion 30, and the second blade 64 is It is located from the bottom surface 48 of the main body 24 to the end surface 65 of the boss 30.

The first blade 63 and the second blade 64 are formed so as to be elastically deformable, and the inner end 72 of the first blade 63 elastically contacts the notch surface 39 of the boss portion 30, and further the inner side of the second blade 64. The end 73 is in elastic contact with the peripheral wall 74 of the boss part 30, and the airflow generator 50 is fitted to the boss part 30.

The first blade 63 and the second blade 64 are integrally formed on a first base 51 and a second base 52, which will be described later, and can be elastically deformed appropriately. The first blade 63 and the second blade 64 can be deformed in a state where they are elastically brought into contact with the peripheral wall of the boss portion 30, and can be easily mounted on the boss portion 30.

Two convex portions 75 are formed on the inner end 72 of the first blade 63, and two concave portions 82 into which the convex portions 75 can be fitted are formed on the notch surface 39 of the boss portion 30. By fitting the convex portion 75 into the concave portion 82 of the boss portion 30, the airflow generator 50 can be mounted on the boss portion 30 while being positioned coaxially and around the axis.

9, the air flow of the first blade 63 is shown at 92, and the air flow of the second blade 64 is shown at 93. When the drive shaft 18 is driven and the outer hook 21 rotates around the rotation axis L, the airflow generator 50 fitted to the boss portion 30 rotates together with the outer hook 21. The first blade 63 facing the bottom opening 41 generates an airflow that flows through the bottom opening 41 of the outer shuttle main body 24. For example, it is possible to generate an air flow in a direction in which air in the outer hook body 24 that has become high temperature due to frictional heat or the like is forcibly sucked from the bottom opening 41 and discharged to the outside of the outer hook body 24.

A part of the high-temperature air discharged from the bottom opening 41 to the external space is discharged from the peripheral wall side opening 70 of the peripheral wall 40 to the external space. Of the air discharged from the bottom opening 41 to the external space, the remaining air that is not discharged from the peripheral wall side opening 70 flows into the second base 52. Part of the air that has flowed into the inside of the second base 52 is discharged from the other side opening 60 of the second base 52 to the external space. Of the air that has flowed into the inside of the second base 52, the remaining air that is not discharged into the external space from the other side opening 60 of the second base 52 flows into the inside of the first base 51 and the other side of the first base 51. It is discharged from the opening 58 to the external space.

The second blade 64 generates an air flow that forcibly discharges the air that has flowed to the bottom surface 48 out of the high-temperature air discharged to the external space through the bottom opening 41 by the first blade 63 to the external space.

Part of the air that flows from the bottom opening 41 to the bottom surface 48 and flows into the second base 52 is discharged from the other opening 60 of the second base 52 to the external space. Of the air that has flowed into the inside of the second base 52, the remaining air that is not discharged into the external space from the other side opening 60 of the second base 52 flows into the inside of the first base 51 and the other side of the first base 51. It is discharged from the opening 58 to the external space.

As described above, the high-temperature air in the outer pot body 24 is divided into the peripheral wall side opening 70, the other side opening 60 of the second base 52, and the other side opening 58 of the first base 51, so that the outer space can be effectively removed. It can discharge | emit and it can suppress that a full rotation kiln becomes high temperature.

The length t1 of the first base 51 in the direction of the rotation axis L is formed to be greater than the length t2 of the second base 52 in the direction of the rotation axis L, and the other side opening 60 of the second base 52 and the first base 51 Therefore, one of the flow of air discharged from the other opening 60 of the second base 52 and the flow of air discharged from the other opening 58 of the first base 51 is the other. Can be prevented.

Since the airflow generator 50 is made of light weight using nylon 12 or the like, there is no need to consider the deviation of the center of gravity due to the mounting of the airflow generator 50, the center of gravity of the rotary hook is displaced from the rotation axis L, Inadvertent vibration can be prevented from occurring.

If the inclination angle θ of the first blade 63 with respect to the rotation axis L shown in FIG. 8 is reduced, the air flow rate increases, but the stress generated in the first blade 63 increases, and the airflow generator 50 may be damaged. When the inclination angle θ of the first blade 63 with respect to the rotation axis L is increased on a virtual plane including the rotation axis L, the stress generated in the first blade 63 is reduced, but the air flow rate is reduced and the outer shuttle body 24 is reduced. The air inside cannot be forcibly discharged to the external space. The inclination angle θ of the first blade 63 is preferably in the range of 30 ° or more and less than 60 °.

FIG. 10 is a front view of a vertical full rotation hook 78 in which the shaft portion 77 is formed integrally with the outer hook body 24. FIG. 11 is a cross-sectional view of the vertical full-rotation rotary hook 78 in which the shaft portion 77 is formed integrally with the outer rotary hook main body 24 as seen from the cutting plane line JJ. Note that portions corresponding to those in the above-described embodiment are denoted by the same reference numerals. The drive shaft 18 shown in FIGS. 1 to 5 and FIG. 9 is detachable from a base boss portion located on the bottom 29 side of the outer shuttle body 24 on a cylindrical boss 30 provided on the bottom 29 of the outer shuttle body 24. Although it is fitted to the bottom part 29, it is not limited to this. As shown in FIG. 11, a shaft portion 77, which is the boss portion 30, is formed integrally with the outer hook body 24, and is connected to the bottom portion 29 of the outer hook body 24. A tool 50 and an airflow generator 85 shown in FIGS. 13 to 15 to be described later may be provided. Even in such a vertical full rotation rack 78, the

airflow generators

50 and 85 can provide the same effects as those of the above-described embodiment.

In the present embodiment, the configuration in which the airflow generator 50 is used for the vertical full rotation hook 20 has been described. However, the rotary hook to which the airflow generator 50 is attached is not limited to the vertical full rotation hook, and two needles are used. It can be used for horizontal full-rotation rotary hooks.

The airflow generator 50 according to the second embodiment will be described. FIG. 12 is a diagram illustrating the flow of air inside the airflow generator 50 according to the second embodiment. In FIG. 12, the air flow of the first blade 63 is indicated by reference numeral 94, and the air flow of the second blade 64 is indicated by reference numeral 95. In the present embodiment, the first blade 63 and the second blade 64 are inclined in the direction opposite to the first blade 63 and the second blade 64 of the above-described embodiment with respect to the rotation axis L, and the air in the external space is The air flow is sucked and flows into the outer shuttle main body 24.

The first blade 63 generates an airflow that flows into the outer shuttle body 24 from the bottom opening 41. A part of the air flowing into the outer rack main body 24 flows through the peripheral wall side opening 70 and then flows from the bottom opening 41. A part of the air flowing into the outer shuttle main body 24 flows into the second base 52 from the other side opening 60, flows out from the one side opening 67, and then flows in through the bottom opening 41. Further, a part of the air flowing into the outer shuttle body 24 flows into the first base 51 from the other side opening 58, flows out from the one side opening 56, and then enters the second base 52 from the other side opening 60. Flows in from the one side opening 67 and flows in through the bottom opening 41.

The second blade generates an airflow that flows from the external space to the vicinity of the bottom surface 48 of the outer shuttle main body 24. Part of the air flowing into the vicinity of the bottom surface 48 flows into the second base 52 from the other side opening 60, flows out from the one side opening 67, and then flows into the vicinity of the bottom surface 48. Further, a part of the air flowing into the vicinity of the bottom surface 48 flows into the first base 51 from the other side opening 58, flows out from the one side opening 56, and then enters the second base 52 from the other side opening 60. After flowing in and out of the one side opening 67, it flows into the vicinity of the bottom surface 48. The air that has flowed into the vicinity of the bottom surface 48 from the external space flows into the outer hook body 24 from the bottom opening 41 by the first blade.

In this way, the high-temperature air in the outer pot body 24 is divided into the peripheral wall side opening 70, the other side opening 60 of the second base 52, and the other side opening 58 of the first base 51, and effectively from the external space. It is possible to suppress the rotation of the rotary hook from being heated.

The airflow generator according to the third embodiment will be described. The description overlapping with the first or second embodiment is omitted, and the same reference numerals are used.

FIG. 13 is a plan view of an airflow generator 85 according to the third embodiment. FIG. 14 is an H arrow view, and FIG. 15 is an I arrow view. In addition, description is abbreviate | omitted about the part which overlaps with description of 1st Embodiment or 2nd Embodiment, and the same referential mark is used.

The air flow generator 85 includes a plurality of adjacent first blades 63, and the first base 86 includes a support portion 87 that supports the first blade 63, and arm portions 88 that are continuously provided on both sides of the support portion 87. The plan view is C-shaped. The second base 89 is provided as a support member for supporting the first blade 63 at a portion where the first blade 63 is located.

Inside the first base portion 86, a wall portion 90 that comes into contact with the notch surface 39 of the boss portion 30 is provided. Two convex portions 75 are formed on the wall portion 90, and a concave portion 82 into which the convex portion 75 can be fitted is formed on the notch surface 39 of the boss portion 30.

The airflow generator 85 is moved from the radial direction orthogonal to the rotation axis L so as to approach the rotation axis L, and the arm portion 88 of the first base 86 is brought into contact with the outer peripheral surface of the boss portion 30 in an elastically deformed state. In addition, the air flow generator 85 can be attached to the boss portion 30 by fitting the convex portion 75 into the concave portion 82 of the boss portion 30.

If the airflow generator 85 is annular, it is necessary to connect the drive shaft 18 to the outer rack 21 after the airflow generator is mounted on the boss part 30. However, if the airflow generator 85 according to the present embodiment is used. In the state where the outer shuttle 21 is connected to the drive shaft 18, the airflow generator 85 can be retrofitted to the full rotary hook attached to the drive shaft 18, and can be easily retrofitted to an existing sewing machine.

In the present embodiment, a wall portion 90 that abuts on the notch surface 39 of the boss portion 30 is provided, and a convex portion 75 that fits into the recess portion 82 of the notch surface 39 is formed on the wall portion 90. The protrusions 75 may be provided on the arm portions 88 without being limited thereto.

18

Drive shaft

20, 78 Vertical full rotation hook 21 Outer hook 22 Open end 23 Inner hook 24 Outer hook main body 25 Inner hook presser member 26 Screw 29 Bottom 30 Boss 31 Blade tip 36 Rail groove 36
37 Rail 39 Notched surface 40 Bottom wall 41 Bottom opening 48

Bottom surface

50, 85

Airflow generator

51, 86

First base portion

52, 89 Second base portion 55 One side end surface 56 One side opening 57 Other side end surface 58 Other side opening 59 Other Side end surface 60 Other side opening 63 First blade 64 Second blade 67 One side opening 69 One side end surface 70 Peripheral wall side opening 72 Inner end 73 Inner end 74 Peripheral wall 75 Convex part 77 Shaft part 82 Concave part 87 Support part 88 Arm part 90

Wall Part

92, 93, 94, 95 Air flow L Rotating axis w1 Outer diameter w2 Outer diameter t1 Length t2 Length

Claims

An outer rack having an outer main body in which a rail groove is formed on the inner periphery and an opening facing the outer space is provided on the bottom,
An inner rail which has a rail on the outer peripheral portion, is fitted in the rail groove, and is stored inside the outer hook main body on the same axis as the rotation axis of the outer hook. Bitten,
A drive shaft connected to the outer race main body and driving the outer race around the rotation axis, and the outer race has a boss portion that connects the drive shaft to the outer race main body. An airflow generator used,
A base that fits into the boss,
A first blade that is connected to the base and faces the opening;
An airflow generator characterized in that an airflow flowing through the opening of the outer hook body is generated when the driving shaft drives the outer hook about the rotation axis.
2. A second blade that is connected to the base and is adjacent to the first blade and that generates an airflow in the rotational axis direction at a distal end portion of the boss portion. 1. The airflow generator according to 1.
The airflow generator according to claim 1 or 2, wherein the base is formed in an elastically deformable C-shape and is detachable along the radius of the boss.