JPS63283698A - Full-rotation hook of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a full-rotation hook of a sewing machine, and more particularly to a structure for supplying lubricating oil to the raceway of the outer hook.

BACKGROUND ART A typical advanced technology is disclosed in Japanese Patent Publication No. 59-9195. According to this prior art, in order to supply lubricating oil to the raceway of the outer hook, a lubricating oil supply pipe is disposed at a position offset from the axis of the outer hook, and the lubricating oil is supplied through the supply pipe. In order to control the flow rate of lubricating oil, a bolt is screwed into the outer hook, and the tip of the bolt faces the supply pipe, and by rotationally displacing this bolt, the angle of inclination of the axis of the supply pipe with respect to the axis of the outer hook is adjusted. The flow rate of lubricating oil is adjusted by setting a.

Problems to be Solved by the Invention In the prior art as described above, the angle l!
! It is difficult to make fine adjustments to the am of the lubricating oil using only the knots, for example, it is impossible to adjust the flow rate below 10-g/sin.

The purpose of the present invention is to solve the above-mentioned problems and to provide a sewing machine with a simple structure that allows the flow of lubricating oil to flow through the entire rotation of the sewing machine with a simple structure. It is.

Means for Solving Problems ll011 The present invention provides a sewing machine for supplying lubricating oil from a supply passage formed in a ring of an outer hook to a raceway formed on an inner circumferential surface of an outer hook. During full rotation, an oil volume T14 node passage extending in the radial direction is formed between the supply passage and a guide passage to the raceway formed at a position radially shifted from the supply passage, and this oil Oil in the amount adjustment passage
i: The sewing machine is characterized in that the oil level adjustment bolt is screwed into the outer hook with the tip of the J4 joint bolt facing forward, and the sewing machine rotates completely.

According to the present invention, in the full rotation hook of the sewing machine, the lubricating oil extends in the radial direction between the supply passage and the guide passage to the raceway formed at a position radially shifted from the supply passage. An oil amount adjustment passage is formed and an oil amount adjustment bolt is screwed therein.

By rotating and displacing the oil amount adjustment bolt, the oil f
The gap between the fi adjustment passages can be adjusted to create a fine flow of lubricating oil! Adjustment is possible.

Embodiment FIG. 1 is a sectional view of an embodiment of the present invention, and FIG.
t51 is a cross-sectional view taken along the cutting plane line ■-■ in FIG. t51. 1st
With reference to the figures and FIG.
A zero-rotation shaft 4, which includes a shaft mounting portion 3 and a rotation shaft 4 fixed to the shaft mounting portion 3, is rotatably supported by a bearing 5. The outer hook body 2 is formed roughly in the shape of a right cylinder with a bottom.
A track groove 6 is formed along the circumferential inner surface. The track 8 of the inner hook 7 fits into the track groove 6, and the inner hook 7 is stored in the storage portion 2a of the outer hook body 2. The inner hook holder 9 prevents the inner hook 7 from being removed from the outer hook body 2. Inner pot 7
Rotation of the needle plate 10 is prevented by a hook stop 11 provided on the throat plate 10. .

The bearing 5 has a space 5a, and an oil supply Ir! for feeding lubricating oil into the space 5a. 12 is arranged on the bearing 5.

Further, an annular drain oil receiver m13 is formed on the end surface 5b of the bearing 5 facing the outer hook 1, and its axis is provided concentrically with the axis of the rotary shaft 4. An oil drain passage 14 communicates with the drain oil receiving groove 13.
is provided on the bearing 5. A cover 28 facing the shaft mounting portion 3 of the upper outer hook 1 is fixed to the outer peripheral surface of the bearing 5, and I'I! ! The shaft mounting portion 3 is encased with a gap.

A spiral groove 4& is provided in a portion of the rotating shaft 4 located in the space 5a of the bearing 5, and a through hole 4b is provided at the top of the groove 4a facing inward in the radial direction of the rotating shaft 4. It will be done. In communication with the through hole 4b, a ml supply passage 15 is formed along the axis of the rotating shaft 4 upward from the through hole 4b.

A roughly truncated conical oil chamber 16 is formed in the housing portion 2arM of the inner hook 7 of the outer hook body 2, and the upper portion of the oil chamber 16 is surrounded by a partition plate 17.

The upper end of the rotating shaft 4 faces the oil chamber 16, and the first
A supply passage 15 is in communication. A second supply passage 18 is formed from the peripheral edge of the oil chamber 1611i1 toward the shaft mounting portion 3 of the outer hook 1 and inclined radially outward. A lower end portion of the second supply passage 18 communicates with an annular groove 19 provided on the lower surface of the shaft mounting portion 3 .

An annular body 20 is fitted along the radially outer side surface of the rR19, thereby forming an annular oil gauge 21.

On the opposite side of the second supply passage 18 with respect to the rotating shaft 4, a third
A supply passage 22 is formed. The third supply passage 22 is formed upward from the circumference I& of the oil gauge 21, and its axis B
is inclined upward and radially outward at an angle θ1 with respect to a line A parallel to the axis of the rotating shaft 4. θ1 may be zero, and the third supply passage 22 is formed outward to near the lower end of the main body 2.

A guide passage 23 is formed substantially parallel to the third supply passage 22 and offset radially outward. The guide passage 23 is formed downward from the storage part 2a of the outer hook main body 2, and is bored near the upper end of the third supply passage 22.

The third supply passage 22 and the guide passage 23 are communicated with each other, and the oil lLi1 joint passage 2
4 is provided on the outer hook body 2. The oil amount adjustment passage 24 is internally threaded, and a 51 oil amount adjustment bolt 25 is screwed into the oil amount adjustment passage 24, the tip of which faces the third supply passage 22.

As shown in FIG. 2, the first supply passage 15, the second supply passage 18, the third supply passage 22, and the guide passage 23 are located approximately on the same line in a plane perpendicular to the axis of the rotating shaft 4, It also substantially coincides with the axis of the oil amount adjustment passage 24.

The oil ffi adjustment port 25, as shown in FIG. A wrench engaging recess 2G is formed.

The engaging recess 26 has a regular hexagonal cross section perpendicular to the axis.

The tip of the oil amount adjustment bolt 25 is connected to the fjs3 supply passage 2.
2 and the guide passage 23.

As shown in FIG. 3, a roughly L-shaped communication groove 27 is formed on the inner surface of the storage portion 2a of the outer hook main body 2, extending from the guide passage 23 to the track groove 6. contact! after 27 q 27
m faces upward and forms an angle of 02 radially outward with respect to the axis of the rotating shaft 4, and the bottom g27b of the communication groove 27 is formed along the radial direction and is slightly inclined downward toward the radial external force. ing.

The operation of the outer hook 1 having the above configuration will be explained below.
The rotating shaft 4 is rotationally driven by a driving means (not shown),
This causes the outer hook 1 to rotate. The inner hook 7 is prevented from rotating by a hook stop 11. At this time, lubricating oil is pumped into the space 5a of the bearing 5 from the oil supply pipe 12 by a pump (not shown). The pumped lubricating oil flows along the spiral groove 4a by the pressure of the rotary pump on the rotary shaft 4, passes through the PIS1 supply passage 15 from the through hole 4b, and is formed in the outer hook body 2. Oil chamber 16
sent to. The lubricating oil sent into the oil chamber 16 accumulates around the side of the oil chamber 16 due to the centrifugal force caused by the rotation of the outer hook 1, and due to the centrifugal force and its own weight, the lubricating oil flows through the ff12 supply passage 18 which is inclined outward in the radial direction. Pass through the oil sump 2
I am guided by 1. Of the lubricating oil led to the oil reservoir 21, the excess lubricating oil flows along the inner circumferential surface of the ring body 20 and drips onto the end surface 5b of the bearing 5. The lubricating oil dripped onto the end surface 5b of the bearing 5 passes from the oil drain receiver rf413 through the oil drain passage 14 and is returned to, for example, an oil tank (not shown). At this time, the cover 28 prevents the lubricating oil from scattering.

The lubricating oil accumulated in the oil reservoir 21 moves up the third supply passage 22 due to the centrifugal force caused by the rotation of the outer hook 1 and is guided to the oil amount adjustment passage 24. By increasing the inclination θ1 of the third supply passage 22, the amount of lubricating oil guided to the oil amount adjustment passage 24 also increases.

The lubricating oil led to the oil amount adjustment passage 24 through the ff13 supply passage 22 is connected to an internal thread provided in the oil amount adjustment passage 24,
An oil amount adjustment bolt 25 screwed into the oil amount adjustment passage 24
The gap between the outer screw and the oil Jt'! From the gap between the tip RA of the I4 joint bolt 25 and the guide passage 23, it is guided to the communication groove 27 through the guide passage 23. This time, oil amount 3
By displacing the one-section bolt 25 radially inward or outward, the guide passage 23 and the oil amount adjustment bolt 25 are
The amount of lubricating oil flowing into the guide passage 23 can be reduced by 1 m by adjusting the distance from the tip of the lubricating oil to the tip of the guide passage 23, or by adjusting the size of the gap between the oil amount adjustment bolt 25 and the guide passage 23.
:! It is possible to make a clause. Oil amount 31 bolts 25
can be displaced radially inward or outward by simply rotating the oil amount adjustment bolt 25, and extremely fine adjustment is possible. If further finer adjustment is required, use the oil amount adjustment bolt 25 and the oil 11 adjustment passage 2.
This is made possible by further reducing the pitch of the screws in step 4. An oil seal is applied to the threaded portion of the oil amount adjustment passage 24 and the oil amount 11-node bolt 25 radially outward from the drilling position of the guide passage 23, so that lubricating oil leaks out of the outer hook body 2. This will be prevented.

The lubricating oil thus adjusted in the oil amount adjusting passage 24 is guided from the guide passage 23 to the communication v427 by the centrifugal force caused by the rotation of the outer pot 1. The lubricating oil guided to the communication groove 27 rises along 1q27a of the communication groove 27 due to centrifugal force, and is supplied to the track groove 6 formed in the outer hook body 2.

By stopping the rotation of the outer hook 1, the bottom 27 of the connection W27
The lubricating oil accumulated in b is promptly supplied to the rail rr 46 when the outer hook 1 is driven again.

FIG. 5 is a cross-sectional view of another embodiment of the invention.

This embodiment is similar to the previous embodiment, and corresponding parts are given the same reference numerals.It should be noted that in this embodiment:
The second supply passage 18m is formed along the radial direction so as to have the same axis as the oil amount adjustment passage 24m. The guide passage 23& is oil 111 from the outside or the bottom surface of the main body 2.
The guide passage 23 is provided through the track m and communicates with the track groove 6.
The vicinity of the lower end of m is sealed by the sealing body 30. The axis of the guide passage 23m is directed upward of the outer hook body 2,
It is inclined radially outward at an angle of 03 with respect to the axis of the rotating shaft 4.

As shown in FIG. 6, the oil amount adjustment passage 24m has a radially inward insertion portion 24I3. The axis of the insertion portion 24b coincides with the axis of the oil J11! four-node passage 24m, and a shaft [25b of an oil amount adjusting bolt 25&, which will be described later, is inserted therethrough.

At the tip of the oil amount adjustment pole) 25m, there is a right cylindrical shaft part 2.
5b is formed, and its tip 25c is formed in a tapered shape, so-called a conical shape. The axis of the sleeve g2'5b coincides with the axis of the oil amount adjustment pole (25m).

In this embodiment, as in the previous embodiment, the lubricating oil sent into the oil chamber 16 accumulates around the side of the oil chamber 16 due to the centrifugal force caused by the rotation of the outer hook 1, and the lubricating oil is collected in the second supply passage 18.
m and is guided to the insertion portion 24b of the oil amount adjustment passage 24a. Excess lubricating oil led to the insertion portion 24b passes through the third supply passage 22, drips onto the end face 5b of the bearing 5, and then passes through the oil passage 14 and is returned to an oil tank (not shown). be done.

The remaining lubricating oil guided to the insertion part 24b is
gap between the shaft portion 25b and the oil amount adjustment port) 25m
The oil is guided to the guide passage 23a through the r51 gap between the outer thread of the oil amount adjusting passage 24m and the inner thread of the oil amount adjustment passage 24m.

Of the lubricating oil guided to the insertion part 24b, the guide passage 23m
When the ring portion 25b is inserted into the insertion portion 24b, the amount of oil guided by the insertion portion 24b can be adjusted by rotationally displacing the oil amount adjustment pole 25a to adjust the overlapping dimension of the insertion portion 24b and the shaft portion 25b. It can be adjusted by changing. In addition, when the shaft portion 25b is not inserted into the insertion portion 24b, the oil amount can be reduced by changing the gap between the conical tip portion 25c of the shaft portion 25b and the j1 portion 24c of the insertion portion 24b. In is possible.

In this way, the lubricating oil guided to the guide passage 23m is
The centrifugal force caused by the rotation of the outer hook 1 guides the oil to the track groove 6, thereby achieving oil supply. In this way, the same effects as in the above-mentioned embodiments can be expected in this embodiment as well.

FIG. 7 is a cross-sectional view of a further embodiment of the present invention.
This embodiment is similar to each of the above-mentioned embodiments, and corresponding parts are given the same reference numbers. Although it was communicated from the passage 24m, in this example,
Guide passage 23 b 1! As shown in FIG.
7bl:! By adopting such a structure, which may be configured to pass through, the same effects as those of the above-mentioned embodiments can be expected.

The present invention can be implemented not only in horizontal full-rotation hooks but also in vertical full-rotation hooks.

Effects As described above, according to the present invention, an oil amount adjustment passage extending in the radial direction is provided between the supply passage and the guide passage, and the oil uI! The amount of lubricating oil supplied can be easily adjusted by simply screwing together the one-node bolt and rotating and displacing the oil amount adjusting bolt. So for example 10 mg
/ It is possible to easily adjust the amount of oil as small as a spoonful.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the section line ■-■ in FIG. 1, FIG. 3 is a partially enlarged view of the vicinity of the communication groove 27, and FIG. 4 5 is a sectional view of another embodiment of the present invention, FIG. 6 is a partial sectional view of the vicinity of the oil zi+ia passage 241, and FIG. 7 is a further embodiment of the present invention. FIG. 1...Outer hook, 4...Rotating shaft, 6...Race groove, 8...
... Track, 15... First supply passage, 18t18a...
-Second supply passage, 21...Oil sump, 22...Third supply passage, 23.23m. 23b...Guide passage, 24=24a...Oil f1 adjustment passage, 24b...Insertion part, 25=25a...Oil tg
Knot bolt, 25b...Shaft agent Patent attorney Keiichi Shisan Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] Lubricating oil from a supply passage formed in the shaft of the outer hook,
In a full-rotation hook of a sewing machine for supplying oil to a raceway groove formed on the inner circumferential surface of an outer hook, the supply passage and a guide passage to the raceway groove formed at a position shifted in the radial direction from the supply passage. An oil volume adjustment passageway extending in the radial direction is formed in between, and the oil volume adjustment bolt is screwed into the outer hook so that the tip of the oil volume adjustment bolt faces the oil volume adjustment passageway. A fully rotating hook on a sewing machine.