JPH07136370A - Lubricating device for sewing machine - Google Patents

Abstract

PURPOSE:To provide a lubricating device for a sewing machine feeding a lubricant to an oil wick in response to the revolving speed of a rotary shaft rotated by the drive of the sewing machine. CONSTITUTION:This lubricating device for a sewing machine is provided with a speeder device 7 arranged on the rotary shaft 1 of the sewing machine, a slide member 19 relatively rotatably supported by the speeder slide 12 of the speeder device 7 moved along the rotary shaft 1 and guided by a guide member 20 for its movement, a guide face 25c rockably supported and coupled with the coupling pin 18 of the slide member 19, a rocking lever 25 excited upward by elastic bodies 26, 26a, and an oil wick 28 fitted to the rocking lever 25 so that its tip section 28a can be brought into contact with a lubricant in an oil reservoir 2 and feeding the lubricant via the capillary tube phenomenon. When the slide member 19 and the coupling pin 18 are moved by the rotation of the rotary shaft 1, the rocking lever 25 is lowered and rocked by the guide face 25c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine oil supply device.

[0002]

2. Description of the Related Art A gear pump type, a plunger type and the like are known as conventional oil supply devices for sewing machines. The gear pump type supplies the lubricating oil delivered by the gear pump to the sliding friction portion of the sewing machine, but requires a gear pump, has a complicated structure, and requires a large oil tank. The plunger type supplies the lubricating oil sent out by the plunger to the sliding friction part of the sewing machine, but it is difficult to adjust the amount of oil supply according to the number of revolutions of the sewing machine, and the amount of oil supplied to each sliding friction part is likely to be insufficient. Alternatively, there was a problem that the amount of oil supply became excessive and oil leaked to the outside easily.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional technical problems.
The structure of the invention of FIG. 1 is rotatably supported by the speeder device 7 arranged on the rotating shaft 1 which is rotated by driving the sewing machine and the speeder slide 12 of the speeder device 7 which moves along the rotating shaft 1. A slide member 19 that moves along the rotary shaft 1 integrally with the speeder slide 12, a guide member 20 that guides the movement of the slide member 19, and an oil reservoir 2 that is fixed to the sewing machine frame 5 and stores lubricating oil. , A guide surface 25c that is swingably supported by the sewing machine frame 5 and that engages with the engagement pin 18 of the slide member 19.
And a guide surface 2 for the swing lever 25.
Elastic bodies 26, 26a for urging 5c upwardly and a tip portion 28
a is attached to the rocking lever 25 so that it can contact the lubricating oil in the oil reservoir 2, and the wick 28 sends the lubricating oil by a capillary phenomenon.
The oil supply device for a sewing machine is characterized in that the rocking lever 25 is formed so as to descend and rock by the movement of the slide member 19 and the engagement pin 18 in accordance with the rotation. According to the configuration of the invention of claim 2, the tip portion 2 of the oil wick 28 is provided.
The oil supply device for a sewing machine according to claim 1, wherein a felt member (3) into which lubricating oil in the oil reservoir (2) infiltrates is disposed so as to face the oil supply device (8a). Further, the structure of the invention of claim 3 is the oil supply device for a sewing machine according to claim 1 or 2, wherein the elastic force of the elastic bodies 26, 26a can be adjusted to be increased or decreased.

[0004]

According to the first aspect of the present invention, when the rotary shaft 1 is rotated by driving the sewing machine, the speeder device 7 is also integrally rotated and centrifugal force is applied. As a result, the speeder slide 12 of the speeder device 7 moves along the rotary shaft 1, and the slide member 19 is integrated with the speeder slide 12 as well.
Move along. The movement of the slide member 19 is guided by the guide member 20.

By the movement of the slide member 19, the engagement pin 18 of the slide member 19 moves along the guide surface 25c of the swing lever 25. The guide surface 25c is formed so as to swing the guide surface 25c of the swing lever 25 downward by the movement of the slide member 19 and the engagement pin 18 in accordance with the rotation of the rotary shaft 1. Elastic body 2
The swing lever 2 swings downward against the resilience of 6, 26a.
The tip portion 28a of the wick 28 attached to 5 contacts the lubricating oil in the oil reservoir 2. This allows wick 2
The lubricating oil that has infiltrated the inside of the wick 8 is sent to the other end of the wick 28 by the capillary phenomenon. By disposing the sliding friction portion of the sewing machine in contact with the other end of the wick 28,
Lubricating oil is supplied.

The swinging motion of the tip portion 28a of the wick 28 in contact with the lubricating oil in the oil reservoir 2 causes the rotation shaft 1 to move.
Is generated at a predetermined rotation speed or more and a predetermined centrifugal force acts on the speeder device 7. Therefore, oil is supplied to the sliding friction portion of the sewing machine according to the rotation speed of the rotary shaft 1.

According to the second aspect of the present invention, the contact between the tip end portion 28a of the wick 28 and the lubricating oil in the oil reservoir 2 is performed via the felt member 3 infiltrated with the lubricating oil. The lubricating oil in 2 is stably replenished in the wick 28.

Further, according to the third aspect of the invention, the elastic force of the elastic bodies 26, 26a is adjusted to be increased or decreased so that the tip 28a of the wick 28 comes into contact with the lubricating oil in the oil reservoir 2. The swing of the moving lever 25 is performed at different rotation speeds of the rotary shaft 1. As a result, it is possible to adjust the oil supply to the sliding friction portion of the sewing machine so that the oil is supplied according to the proper rotation speed of the rotary shaft 1.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment, in which reference numeral 1 is a main shaft which is rotated by driving a sewing machine,
An oil reservoir 2 is arranged inside the sewing machine frame 5 near the main shaft 1 (upper shaft). The oil reservoir 2 is
It is clamped by a support portion 4a of an oil reservoir mounting plate 4 mounted by a mounting screw 6 on a sewing machine frame 5 such as a sewing machine arm. A felt member 3 made of non-woven fabric, felt paper, or the like is pushed into the opening 2a of the oil reservoir 2, and the upper end of the felt member 3 slightly protruding from the opening 2a has a capillarity of lubricating oil stored in the oil reservoir 2. Due to the phenomenon, it rises and is in an infiltrated state.

On the other hand, a speeder device 7 is arranged on the main shaft 1. The speeder device 7 includes a speeder body 8 which is externally fitted to the main shaft 1 and fixed by a set screw 8a, and a speeder slide 12 which is slidably externally fitted to the main shaft 1 via a sliding sleeve 16 described later. The body 8 and the speeder slide 12 are connected by a plurality of bendable sets of links 10 and 13. That is, one end of one link 10 is swingably connected to the upper and lower parts of the speeder body 8 by the pins 11, and the other link 13 is connected.
One end of each of the links 1 is swingably connected to the upper and lower portions of the speeder slide 12 by a pin 14.
The other ends of 0 and 13 are swingably connected by a pin 15. Further, a coil spring 9 that is an elastic body (spring or rubber) that elastically biases the speeder slide 12 away from the speeder body 8 is installed on the main shaft 1. Then, when the main shaft 1 is rotated by driving the sewing machine, the links 10, 13 are bent by the mass of the links 10, 13 and the pin 15, and the speeder slide 12 is
It moves toward the speeder body 8 along the main shaft 1 against the elastic stretching force of the coil spring 9.

A slide member 19 is supported on the speeder slide 12 such that the slide member 19 is rotatable relative to the speeder slide 12 and is not relatively movable in the central axis direction. The slide member 19 is configured by fixing a sliding sleeve lever 17 with a set screw 17c to the outer periphery of the large diameter portion 16b at one end of the sliding sleeve 16 that is fitted onto the main shaft 1 so as to be relatively movable in the central axis direction. . And this sliding sleeve 1
The other end of 6 is inserted into the hole 12a of the speeder slide 12 so as to be relatively rotatable, and a retaining ring 22 is attached to the protruding end 16a to prevent it from coming off. Therefore, the speeder slide 12 is allowed to rotate relative to the sliding sleeve 16 between the retaining ring 22 and the large diameter portion 16b.

Reference numeral 23 is a collar fixed to the main shaft 1 by a set screw 24. When the sliding sleeve 16 comes into contact with the collar 23, sliding of the sliding sleeve 16 is restricted, and the links 10 and 13 are both fixed. The extension is regulated as a state in which it is bent slightly outward as shown by the solid line in FIG. In addition, an engaging pin 18 is provided on the upper end of one protruding piece 17b of the sliding sleeve lever 17.
And a flat guide portion 17a formed by bending the lower end of the other protruding piece is slidable on the flat guide portion 20a of the guide member 20 fixed to the sewing machine frame 5 with screws 21. Are in contact. That is, in the sliding sleeve 16 and the sliding sleeve lever 17, the guide portion 17a is in contact with the guide portion 20a on both sides in the direction orthogonal to the central axis of the main shaft 1 for a long time and cannot rotate, and only in the central axis direction of the main shaft 1. It is slidable.

On the other hand, the swing lever 25 is arranged substantially parallel to the main shaft 1.
To place. The swing lever 25 has a mounting hole 25 at the base end.
With the hinge pin 27 inserted in a, the sewing machine frame 5
It is swingably supported by the front end side and forms a forked portion 25b. The upper surface of the lower protruding piece 25c, which is the guide surface of the forked portion 25b, is engaged with the engagement pin 18. Further, the other end of the spring 26, which is an elastic body (spring or rubber) whose one end hooks on the sewing machine frame 5, hooks on the base end of the rocking lever 25, and the tip of the rocking lever 25 rises. It is urged to swing. The engaging portions A, B, C of the spring 26 on the swing lever 25 are provided at a plurality of locations (three locations in this embodiment) so that the swing biasing force of the spring 26 can be adjusted.

The spring 26 shown in FIG. 1 is composed of a torsion coil spring wound around the medium diameter portion 27a of the hinge pin 27, but as shown in FIG. It is also possible to use a spring 26a that is a tension coil spring that is stretched between the frame 5 and the frame 5. When the spring 26a made of a tension coil spring is stretched between the sewing machine frame 5 and the sewing machine frame 5, a plurality of hook portions A, B, C may be formed on the sewing machine frame 5.

An oil tube 29 is fixed by a binding cord 30 along a protruding piece 25d on the upper side of the forked portion 25b of the swing lever 25. The oil wick 28 is inserted into the oil tube 29, and the oil wick 2
Both ends of 8 respectively project from the oil tube 29, the tip 28a thereof normally faces above the felt member 3, and the base 28b is in contact with the sliding friction portion 31 which is the oil supply point of the sewing machine. Actually, the base end portion 28b of the oil wick 28 is branched into a plurality of portions and is in contact with the sliding friction portions 31 at a plurality of locations. The oil wick 28 has a structure similar to that of a wick used for a heat pipe, and has an action of sending lubricating oil by a capillary phenomenon. The upper surface of the projecting piece 25c of the rocking lever 25 with which the engaging pin 18 is engaged is moved by the slide member 19 to the left in the drawing accompanying the rotation of the rotary shaft 1 at a predetermined number of rotations. The rocking lever 25 is rocked downwardly by the engagement of, and the tip end portion 28a of the oil wick 28 is brought into contact with the felt member 3.

Next, the operation of the above embodiment will be described. When the sewing machine is driven, the spindle 1 starts rotating and the speeder device 7 rotates. That is, the speeder body 8 fixed to the main shaft 1 rotates, and the speed of the speeder body 8 increases.
Although the speeder slide 12 coupled via 13 also integrally rotates, the sliding sleeve 16 rotatably supported by the speeder slide 12 has a guide portion 17 a of the sliding sleeve lever 17 and a guide member 20.
Since it is slidably in surface contact with the guide portion 20a, it does not rotate. The rotation of the speeder device 7 causes the centrifugal force acting on the links 10 and 13 and the pin 15 (centrifugal pendulum) to bend the links 10 and 13 outward so as to reduce the crossing angle, and the speeder slide 12 Moves toward the fixed speeder body 8. At that time, the sliding sleeve 16 and the sliding sleeve lever 17 slide with the speeder slide 12 toward the speeder body 8,
At the same time, the coil spring 9 is elastically compressed and deformed.

As a result, the engaging pin 18 of the sliding sleeve lever 17 causes the protruding piece 25c of the swing lever 25 to move.
Of the hinge pin 2 on the swing lever 25.
A downward swing around 7 is applied. At that time, the spring 26 or 26a is elastically deformed. The swing angle of the swing lever 25 is the amount of movement of the speeder slide 12, that is, the spindle 1.
When the main shaft 1 is rotated at a predetermined speed, the tip portion 28a of the oil wick 28 comes into contact with the felt member 3 as shown in FIG. The lubricating oil stored in is supplied to the tip portion 28a of the oil wick 28 via the felt member 3.

The lubricating oil supplied to the tip end portion 28a of the oil wick 28 advances in the oil wick 28 by a capillary phenomenon and reaches the base end portion 28b. Oil wick 28
Since the base end portion 28b of the machine is in contact with the sliding friction portion 31, which is the lubrication portion of the sewing machine, the sliding friction portion 31 is appropriately lubricated. In this way, depending on the rotation speed of the main shaft 1 and thus the drive speed of the sewing machine, the oil wick 28
Since the lubricating oil is supplied to the tip portion 28a of the sewing machine, the sliding friction portion 31 of the sewing machine is supplied with oil according to the driving speed of the sewing machine.

FIG. 3 shows the rotation speed of the sewing machine and the oil wick 2.
8 shows the relationship with the stroke length of the tip portion 28a of
Lines A, B, and C are hooks of springs 26 and 26a, respectively.
The characteristics corresponding to the hooking positions on A, B, and C are shown.
As is known from the figure, the springs 26 and 26a have a weak resilience.
In the state where it is latched on the latching part C by force, the low rotation speed N₁At
Predetermined stroke at the tip 28a of the oil wick 28
Given the length H, the springs 26 and 26a have an intermediate elastic force.
In the state of being hooked on the hooking portion B, the intermediate rotation speed N ₂At
Predetermined stroke at the tip 28a of the oil wick 28
Given the length H, the springs 26 and 26a have a strong resilience.
In the state of being hooked on the hook portion A by force, the high rotation speed N₃At
Predetermined stroke at the tip 28a of the oil wick 28
A length H is given.

In this way, the rotation speeds N ₁ , N ₂ , N ₃
Accordingly, the lubricating oil is replenished from the felt member 3, respectively. The predetermined stroke length H is a moving length required for the tip portion 28a of the oil wick 28 to come into contact with the felt member 3, and the rotation speeds N ₁ and N ₂ at which the stroke length H or more is given. , N ₃ or more, the tip portion 28 a of the oil wick 28 is in contact with the felt member 3. However, since the tip end portion 28a of the oil wick 28 contacts the felt member 3, the subsequent downward swing of the swing lever 25 and the oil wick 28 is limited.

The tip portion 28a of the oil wick 28 is
Is provided with a predetermined stroke length H, and when the lubricating oil is supplied to the tip end portion 28a of the oil wick 28, a rocking lever 25 and a stopper for surely restricting further rocking of the oil wick 28 are provided. You can Such a stopper is, for example, a stopper that abuts the engagement pin 18 with the root of the forked portion 25b of the swing lever 25, or abuts when the speeder slide 12 moves toward the speeder body 8 by a predetermined length. Is provided to suppress the subsequent swing of the swing lever 25 and the oil wick 28.

If the driving of the sewing machine is stopped, both links 1
The centrifugal force no longer acts on 0, 13 and the pin 15, and the rocking lever 25 returns to the upward position by the elastic force of the spring 26 or 26a. Return of the rocking lever 25 to the ascending position and the coil spring 9
Due to the elastic extension force of the
Since it is pushed toward the tip along the upper surface of the protruding piece 25c, the sliding sleeve lever 17 and the sliding sleeve 16 slide on the main shaft 1 together with the speeder slide 12, and the sliding sleeve 16 contacts the collar 23. As a result, both links 10 and 13 extend to a slightly bent state and return to the initial position.

By the way, in the above embodiment, the speeder device 7 is arranged on the main shaft 1, but the speeder device 7 may be attached to the rotary shaft which is rotated by the driving of the sewing machine.
For example, it is possible to attach the speeder device 7 to a dedicated rotary shaft that is rotationally driven by the rotation of the main shaft 1 via a gear device. In addition, the protruding piece 25c of the swing lever 25
It is also possible to form the upper surface of the positive movement cam surface of the positive movement cam to ensure the engagement with the engagement pin 18. Further, the slide member 19 is spline-coupled to the main shaft 1, and the guide member 2
0 and the guide portion 17 of the sliding sleeve lever 17
It is also possible to replace a with a spline to guide the movement of the slide member 19.

[0024]

As can be understood from the above description,
According to the present invention, according to the rotational speed of the rotating shaft that is rotated by the driving of the sewing machine, the lubricating oil of the oil reservoir is supplied to the tip of the oil wick in the case of high speed rotation, and the tip of the oil wick is lubricated. In the case of low-speed rotation that does not come into contact with oil, a small amount of lubricating oil remaining in the oil wick is supplied to the sliding friction part, so that the sliding friction part is supplied with oil according to the sewing speed of the sewing machine. In addition, since the oil wick comes into contact with the lubricating oil in the oil reservoir to supply the lubricating oil, and as long as the oil wick comes into contact with the lubricating oil, the oil wick is supplied almost constantly regardless of the rotation speed of the rotating shaft. And a sufficient amount of lubricating oil is surely supplied to the oil wick. As a result, necessary and sufficient oil is supplied to the sliding friction portion, seizure wear due to insufficient oil supply is prevented, and leakage of lubricating oil to the outside due to excessive oil supply is satisfactorily suppressed.
According to the third aspect of the present invention, it is possible to set the timing at which the tip portion of the oil wick comes into contact with the lubricating oil in the oil reservoir according to the number of revolutions of the rotary shaft and thus the sewing speed of the sewing machine. The necessary and sufficient amount of oil can be supplied to the dynamic friction portion at an appropriate rotation speed of the rotating shaft.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an oil supply device for a sewing machine according to an embodiment of the present invention.

FIG. 2 is an explanatory view of the same operation.

FIG. 3 is a diagram showing a rotation speed of the sewing machine and a stroke length characteristic of the oil wick.

[Explanation of symbols]

1: Spindle (rotary shaft), 2: Oil reservoir, 3: Felt member, 5: Sewing machine frame, 7: Speeder device, 1
0, 13: link, 12: speeder slide, 15: pin, 16: sliding sleeve, 17: sliding sleeve lever, 18: engaging pin, 19: slide member, 20: guide member, 25: rocking lever, 25c:
Projecting piece (guide surface), 26, 26a: spring, 28: oil wick, 28a: tip portion, 28b: base end portion.

Claims (3)

[Claims] 1. A speeder device (7) arranged on a rotating shaft (1) which is rotated by driving a sewing machine, and a speeder slide (7) of the speeder device (7) which moves along the rotating shaft (1). A slide member (19) which is rotatably supported by the slide member (12) and moves integrally with the speeder slide (12) along the rotation axis (1), and a guide member (20) which guides the movement of the slide member (19). An oil reservoir (2) fixed to the sewing machine frame (5) for storing lubricating oil and an engagement pin (18) of the slide member (19) swingably supported by the sewing machine frame (5). A swing lever (25) having a guide surface (25c) to be engaged, an elastic body (26, 26a) for upwardly biasing the guide surface (25c) of the swing lever (25), and a tip portion (28a). For lubricating oil in the oil reservoir (2) The guide surface (25c) is equipped with an oil wick (28) which is attached to a swing lever (25) so as to be contactable and which sends lubricating oil by a capillary phenomenon.
However, due to the movement of the slide member (19) and the engagement pin (18) accompanying the rotation of the rotating shaft (1), the swing lever (25) is
A refueling device for a sewing machine, wherein the refueling device is formed so as to swing down. 2. A tip portion (28) of the oil wick (28)
2. The oil supply device for a sewing machine according to claim 1, further comprising a felt member (3) which is opposed to a) and into which the lubricating oil in the oil reservoir (2) infiltrates. 3. The refueling device for a sewing machine according to claim 1, wherein the elastic force of the elastic body (26, 26a) can be increased or decreased.