JPS5847584Y2 - Lubricating oil supply device to guide roller spindle in magnetic tape cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a device for adhering and supplying lubricating oil to the guide roller support shaft of a magnetic tape cartridge when it is assembled.

In other words, in a magnetic tape cartridge, when the magnetic tape rotatably inserts and supports the guide roller on the guide roller support shaft installed in one half case that constitutes the main body case, the guide roller rotates smoothly. To achieve this, lubricating oil may be applied to the guide roller support shaft in advance.

However, if too much lubricating oil adheres to the guide roller spindle, it will leak to other parts when the guide roller rotates and fly onto the magnetic tape, etc., so it must be in an extremely small amount, and it is generally done by inefficient methods. It was applied at work.

A device that uses a special valve to supply lubricating oil under pressure to the guide roller spindle in fixed quantities has been considered, but since the amount of lubricating oil discharged at one time is extremely small, it is necessary to frequently supply lubricating oil over a long period of time. The problem was that while the valve was being opened and closed, air bubbles were generated inside the valve due to an increase in oil temperature or leakage, making the amount of lubricating oil discharged unstable.

Focusing on this fact, this device has been devised to provide a lubricating oil supply device to the guide roller support shaft that can reliably extract lubricating oil in extremely small amounts and that does not cause performance deterioration even during long-term continuous operation. The main feature of this system is that the lower part of the lubricating oil in the oil pan is immersed in the lubricating oil so that it adheres to the periphery of the rotating body, which is then taken out and then applied to the rotating body. The lubricating oil is transferred to the tip of a movable movable pin and then supplied to the guide roller support shaft.

The details of this invention will be explained below based on the drawings.

FIG. 1 illustrates a standard Philips type magnetic tape cartridge.

The main case 1 of this is an upper and lower plastic half case 1a.

1b are screwed together in a lid-matching manner, drive shaft insertion holes 2, 2 are transparently provided on the left and right sides of the center part, and a pair of hubs 3, 3 are rotatably installed inside these insertion holes 2, 2, An erasing head insertion port 4, a recording/playback magnetic head insertion port 5, and a pinch roller insertion port 6 are provided on the front surface of the case.

Then, the magnetic tape 7 is wound with its both ends locked to each hub 3, fed out from one supply hub 3, passed through the front insertion openings 4, 5, and 6 in order, and then transferred to the other winding hub 3. Wind it up.

During the running path of the magnetic tape 7, there are side tape guide pins 9, 9 and guide rollers 1 on the front left and right sides of the main body case 1.
A support shaft 11°11 that supports the magnetic head 0 and 10 in a freely rotatable manner, and central tape guide pins 12 and 12 are integrally implanted from the lower half case 1b on the front left and right sides of the magnetic head insertion opening 5, respectively. The tape 7 connects these guide pins 9,1
2 and guide rollers 10.

When assembling a magnetic tape cartridge having such a structure, the lower half case 1b is set in a horizontal position at a predetermined position on the assembly line, and after applying a very small amount of lubricating oil to each guide roller spindle 11, The guide rollers 10 are respectively inserted and supported on the support shafts 11, and the present device for adhering and supplying lubricating oil to the guide roller support shafts 11 is as follows.

In FIGS. 2, 3, and 4, an oil pan 14 for storing lubricating oil 13 is placed in front of the lower half case 1b at the set position on the assembly line. A pair of rotating rollers 15, 15 whose lower portions are immersed in lubricating oil 13 and rotate intermittently at a constant angle (for example, 120') in a constant direction are supported.

At the top of each rotating roller 15, a rod 1 is fixed with a pair of left and right movable pins 16 facing the roller circumferential surface.
7 is horizontally mounted, and this rod 17 is configured to be movable in parallel up and down and back and forth, and rotatable by 90 degrees.

Further, on the circular outer circumferential surface of each rotating roller 15, a concave groove 18 is formed in the center over the entire circumference, and a doctor blade 19 that acts on the roller circumferential surface is disposed facing each other.

Incidentally, the diameter of the movable pin 16 is 1.7 mm, and the groove 1
8 is approximately groove depth 11RrIL1 groove width 5rILr/.

In such a case, the lubricating oil supply device of the present invention operates as follows.

(1) First, rotate the rotating roller 15 at a certain angle (1200
) in the direction of the arrow so that the lubricating oil 13 in the oil pan 14 adheres to the outer circumferential surface of the roller and is temporarily removed.

At this time, excess lubricating oil adhering to the outside of the groove 18 is scraped off with a doctor blade 19 and returned to the inside of the pan.

(2) Lower the rod 17 so that the tip of the movable pin 16
The pin enters into the concave groove 18 of the stopped rotating roller 15, collects a very small amount of lubricating oil in the concave groove 18 and attaches it to the tip of the pin, and raises the rod 17.

(3) Rotate the rod 17 by 90 degrees to bring the movable pin 16 into a horizontal position facing the set half case 1b.

(4) Move the rod 1T forward to bring the tip of the movable pin 16 into light contact with the guide roller support shaft 11, transfer the lubricating oil adhering to the pin tip to the support shaft 11, and then
The rod 17 is moved back and returned to its original position.

The above is one lubricating oil supply operation, and thereafter this operation will be repeated every time a new half case 1b is set on the assembly line.

Note that as a means for attaching an appropriate amount of lubricating oil to the circumferential surface of the rotating roller 15 and temporarily leading it out from the oil pan 14, in addition to the above-mentioned groove 18, the roller circumferential surface is formed into a rough surface having minute irregularities. While forming, the doctor blade 19
A lubricating oil layer of an appropriate thickness may be formed on the roller circumferential surface by keeping the lubricating oil layer slightly apart from the roller circumferential surface.

Furthermore, by treating the circumferential surface of the rotating roller 15 to be lipophilic and keeping the doctor blade 19 slightly apart from the circumferential surface of the roller, lubricating oil can be applied to the circumferential surface of the roller to a predetermined thickness.

Furthermore, the rotating roller 15 uses these rotating bodies instead of other rotating bodies such as belts and wires to rotate the oil pan 14.
The lubricating oil may be derived from.

As explained above, according to this invention, the oil pan 1
The lubricating oil 13 in the rotary body 15 is first attached to the circumference of the rotating body 15, then transferred to the tip of the movable pin 16, and then attached and supplied to the guide roller support shaft 11. The amount of lubricating oil that is pumped out can be kept constant and extremely small due to its viscosity and surface tension.

In addition, there is no need to forcibly pressurize the lubricating oil and pass it through oil passages and valves as in the past, so even during long-term continuous operation, the oil temperature does not rise or bubbles occur, ensuring a stable oil supply. It has now been possible to perform the operation properly.

[Brief explanation of drawings]

Figure 1 is a cutaway overall plan view of the upper half case of a magnetic tape cartridge, which is the subject of this invention, and Figure 2 is a
FIG. 3 is a perspective view of the lubricating oil supply device according to this invention, FIG. 3 is a side view showing an outline of its oil supply operation, and FIG. be. 1...Main case of magnetic tape cartridge,
1b...Lower half case of main body case, 10.
... Guide roller, 11 ... Guide roller support shaft, 13 ... Lubricating oil, 14 ...
・Oil pan, 15...Rotating body, 16...
...Movable pin, 18...Concave groove, 19...
...Doctor Blade.

Claims (1)

[Claims for Utility Model Registration] (1) One half case 1b constituting the main body case 1 of the magnetic tape cartridge is set at a predetermined position on an assembly line, and the guide roller support shaft 11 is implanted in the half case 1b. In this device, an oil pan 14 for storing lubricating oil 13 and an oil pan 14 are installed at a set position of a half case 1b on an assembly line.
A rotating body 1 whose lower part is immersed in lubricating oil 13 inside and rotates.
5 and a small-diameter movable pin 16 whose tip moves close to the exposed portion of the rotating body 15 above the oil surface and moves close to the guide roller support shaft 11, and the tip of the movable pin 16 moves close to the exposed part of the rotating body 15 above the oil surface. A device for supplying lubricating oil to a guide roller support shaft in a magnetic tape cartridge, in which an appropriate amount of lubricant oil adhering to a magnetic tape cartridge is drawn up in appropriate amounts and supplied to the guide roller support shaft 11. (2) Utility model registration in which the rotating body 15 is a roller having grooves 18 formed on its circular outer circumferential surface over the entire circumference, and the tip of the movable pin 16 enters into the grooves 18. A lubricating oil supply device according to claim 1. (3) The lubricating oil supply device according to claim 1 or 2, wherein the rotating body 15 is configured to rotate intermittently at a constant angle. (4) There are two sets of rotating body 15 and movable pin 16,
The lubricating oil supply device according to claim 1, 2, or 3, which acts simultaneously on a pair of left and right guide roller support shafts 11 installed in the half case 1b.