JPS62186894A - Lubricant recovery apparatus of shaft support mechanism - 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] [Industrial Application Field] The present invention has a shaft and a bearing in which a support hole into which the shaft is inserted is formed, and lubricating oil is provided between the shaft and the support hole. The present invention relates to a shaft support mechanism configured to be supplied with lubricating oil, and particularly to a lubricating oil recovery device for a shaft support mechanism for recovering the lubricating oil.

[Prior art] Conventionally, for example, fixing the spreader of a decorative stitch sewing machine
Some shaft support mechanisms that support shafts that protrude from the inside of the frame to the outside, like rods, have an O-ring or oil seal installed between the shaft and the bearing. Some devices are designed to prevent lubricating oil from leaking to the outside using O-rings or oil seals.

[Problems to be solved by the invention] In the conventional device described above, wear phenomena due to long-term use, aging of the rubber material in the O-ring, reciprocating rotation of the spreader when operating at high speed, etc. Therefore, leakage of lubricating oil to the outside could not be completely prevented. On the other hand, in the sewing industry, which produces clothing as a product, it is well known that lubricating oil leaks from inside the sewing machine frame and adheres to the fabric. From this mountain range, it is possible to consider ways to reduce the amount of lubricant supplied to the bearings in order to reduce the amount of lubricant leaking to the outside. However, the higher the movement speed of the shaft, the greater the amount of lubricating oil required to prevent the phenomenon of shaft seizure, and therefore there is a limit to reducing the amount of lubricating oil supplied. On the other hand, it is conceivable to use oil-free type bearings (for example, oil-impregnated bearings);
When operating at high speeds such as in industrial sewing machines, this bearing is not suitable for high-speed operations because a seizure phenomenon still occurs. Therefore, in industrial sewing machines that have a wide operating speed range from several hundred revolutions per minute to several thousand revolutions per minute (e.g. 8000 revolutions), some leakage of lubricant from the bearings is considered unavoidable. .

[Object of the Invention] The present invention has been made in order to solve the above-mentioned problems, and its purpose is to provide a lubricating oil recovery device with a shaft support structure that can prevent lubricating oil from leaking regardless of the operating speed. It is on offer.

[Means for Solving the Problems and Their Effects] In the present invention, one end of either the shaft or the bearing is open, and the other end is an oil drain hole that communicates with the support hole of the shaft provided in the bearing. and a suction device connected to the one end of the oil drain hole and sucking lubricating oil supplied between the shaft and the support hole through the oil drain hole and returning it to the oil tank. The suction device returns the supplied lubricating oil to the oil tank.

[Embodiment] Hereinafter, the present invention will be explained in detail with reference to the drawings showing an embodiment in which the present invention is embodied in a shaft support mechanism for a spreader fixing rod of a decorative stitch sewing machine.

A bearing 2 is fitted and fixed to the low wall of the machine frame 1 of the sewing machine so as to extend downward from the inside of the machine frame 1 along the -vertical axis, and a spreader described later is fixed to the bearing 2. A support hole 3 into which a rod 3 is rotatably fitted is bored through the support hole 3 . The upper end surface of the bearing 2 has a support hole 3 extending from the outer part of the bearing.
Four lubricating oil guide grooves 5 are formed that are inclined toward the inner circumferential surface of the lubricating oil guide groove 5. Lubricating oil is supplied from the oil tank 14 to the guide groove 5 by a supply mechanism (not shown), and passes through the lubricating oil guide groove 5. and is supplied to the fitting gap between the spreader fixing rod 3 and the inner circumferential surface of the support hole 4.

The spreader fixing rod 3 has a flange 6 integrally formed at its upper end, and a spreader 31 is fixed at its lower end, and is connected to the vertical movement of a sewing machine needle (not shown) via a motion transmission mechanism (not shown). It is swung in time. The lower surface of the flange 6 of the spreader fixing rod 3 is in contact with the upper end surface of the bearing 2, and the downward movement of the fixing rod 3 is restricted. Also,
The spreader fixing rod 3 has the bearing 2 attached to its collar 6.
A collar 7 is screwed to a position sandwiching the spreader fixing rod 3, thereby restricting upward movement of the spreader fixing rod 3.

The spreader fixing rod 3 is provided with a first oil drain hole 8 extending downward from the upper end surface of the flange 6, and the spreader fixing rod 3 is provided with a first oil drain hole 8 extending downward from the upper end surface of the flange 6. stick 3
A second oil drain hole 9 extending to the outer peripheral surface is bored.

Therefore, the oil drain holes 8.9 constitute an oil drain hole whose one end is open and the other end communicates with the support hole 4.

The first oil drain hole 8 is filled with a felt material 10, and the lubricating oil that has entered the second oil drain hole 9 is absorbed by the felt material 10. A nipple 11 is screwed into the open end of the first oil drain hole 8, and the nipple 11 is connected to the suction port of a pump 13 (for example, a plunger pump) via a vinyl tube 12. The discharge port is connected to the oil tank 14. A rod-shaped felt 15 is inserted into the nipple 11 and the vinyl tube 12, and one end of the rod-shaped felt 15 penetrates into the felt material 10, and the other end penetrates into the suction port of the pump 13. ing. Therefore, the excess lubricating oil supplied to the fitting gap between the support hole 4 and the spreader fixing rod 3 due to the negative pressure generated on the suction side by the action of the pump 13 is transferred to the second oil drain hole 9, Fell 1~
The oil is sucked into the pump 13 through the material 10 and the rod-shaped felt 15, and is discharged and returned to the oil tank 14.

Further, an O-ring 16 is installed between the lower part of the bearing 2 and the spreader fixing rod 3.

Next, its effect will be explained.

When the operator closes the power switch and steps forward on the foot pedal, the main shaft of the sewing machine is rotated, the needle moves up and down, and the looper in the bed is swung, and in time with this, the subleg 31 is moved. Decorative stitches are formed by swinging and transporting the work cloth. At this time, lubricating oil is supplied from the oil tank 14 to each movement mechanism, and also to the lubricating oil guide cup 5 of the bearing 2. As the spreader fixing rod 3 swings, lubricating oil is supplied into the fitting gap between the bearing 2 and the support hole 4.

On the other hand, in synchronization with the front depression of the foot pedal, the pump 13
operates and generates negative pressure on its suction side.

Due to this negative pressure, the unconsumed surplus of the lubricating oil supplied to the ik gap enters the second oil drain hole 9 and is then absorbed by the felt material 10 in the oil drain hole 8 of the cylinder 1. Ru. The lubricating oil absorbed by the felt material 10 is transferred to the rod-shaped felt 1
5 and is sucked into the pump 13, then the oil is drawn into the oil tank 14.
It is discharged and reduced. Therefore, since the excess lubricating oil is returned to the oil tank, leakage of the lubricating oil to the outside is prevented without considering the increase or decrease in the amount of oil supplied depending on the operating speed.

It should be noted that the present invention is not limited to the above-mentioned embodiments,
It is also possible to provide oil drainage holes in the bearing. In short, any oil drain hole may be used as long as it communicates the support hole of the bearing with the outside world, and various modifications can be made without departing from the spirit of the present invention.

[Effects of the Invention] Since the present invention is configured as described above, surplus lubricating oil can be reliably returned to the oil tank regardless of the operating speed, so leakage of lubricating oil to the outside can be prevented. This has the effect of not only avoiding contamination of products due to lubricating oil, but also keeping the workplace environment clean.

[Brief explanation of drawings]

FIG. 1 shows an embodiment embodying the present invention, and FIG. 2 is a sectional view showing only the main part thereof in a partially cutaway manner, and FIG. 2 is a perspective view showing only the bearing. 2 is a bearing, 3 is a spreader fixing rod, 4 is a support hole, 8 is a first oil drain hole, 9 is a second oil drain hole, 13 is a pump, 1
4 is an oil tank.

Claims (1)

[Claims] 1. A shaft (3) and a support hole (4) into which the shaft (3) is inserted.
) is formed, and the shaft support mechanism is configured such that lubricating oil is supplied from an oil tank (14) between the shaft (3) and the support hole (4). , an oil drain hole (8, 9) is provided in either the shaft (3) or the bearing (2), one end of which is open and the other end communicated with the support hole (4); 8, 9)
The lubricating oil supplied between the shaft (3) and the support hole (4) is connected to the one end of the shaft (3) and the support hole (4).
9) A lubricating oil recovery device for a shaft support mechanism, characterized in that a suction device (13, etc.) is provided for sucking through the oil tank (14) and returning the oil to the oil tank (14).