JPH077162Y2 - Bearing protection device for marking machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a bearing protection device of a marking machine for marking a product name, model number, etc. on a surface of a product etc. with ink, and particularly, for example, for a semiconductor product etc. It is related to a small stamping machine.

[Conventional technology]

FIG. 3 is a conventional example 1 showing the vicinity of an ink transfer roller of a printing machine.
FIG. 4 is a front view of Conventional Example 2, FIG. 5 is a front view of Conventional Example 3, and FIG. 6 is a front view of Conventional Example 4.

In FIG. 3, the ink pot 2 storing the ink 1 is composed of side plates 3a, 3b and the like. An upper portion of an ink transfer roller 7 mounted on a shaft 6 supported by a hermetically sealed bearing 5 mounted on a bearing frame 4 is partially seen in a lower portion of the ink pot 2. The ink transfer roller 7 sequentially makes contact with a plurality of ink kneading rollers (not shown) so as to supply the ink to a stamp rubber (not shown) with a uniform thickness.

In this structure, the ink 1 leaks from the gap between the ink pot 2 and the ink transfer roller 7, and the ink still penetrates the bearing 5 along the shaft 6 even if the sealed type is used. Therefore, as shown in FIG. 4, a flinger 41 such as stainless steel is fixed to the shaft 6 with a set bolt 42, or a groove 51 is provided in the shaft 6 as shown in FIG. 5, or as shown in FIG. A step 61 is integrally formed on the shaft 6.

[Problems to be solved by the device]

In the prior art of FIG. 3 described above, the ink contains an organic solvent and the penetrating power is strong even if a sealed bearing is used. Therefore, the ink permeates the bearing, mixes with (a) the lubricant and impairs lubrication, and the rotating frictional force increases to damage the bearing or generate heat. (B) This heat is transmitted to the ink transfer roller to raise the temperature of the ink, and the viscosity changes due to the volatilization of the solvent, causing uneven printing and bleeding. (C) Therefore, it is necessary to clean and maintain the shaft and bearing in a short period.
Since the ink in the bearings may have solidified at the start of work every day, start-up maintenance is essential. The addition of a shaft seal device such as an oil seal does not solve the problem but merely shifts the situation from the bearing to the shaft seal device.

In the case of the one shown in FIG. 4, since the flinger 41 is fixed with the set bolt, the installation work is difficult and the space is required, and it is difficult to take the space with a small marking machine having a small size near the ink pot and the ink transfer roller. Flinger 41 and shaft 6
Ink easily penetrates through the gap between.

In FIGS. 5 and 6, unless the groove 51 or the step 61 is enlarged, the ink containing the organic solvent and having a large surface tension will get over.

The purpose of this invention is to prevent ink from penetrating into the bearing with a simple structure, and to prevent the bearing from malfunctioning as shown in (a), (b) and (c) above, imprinting failure due to ink drying, and operation. It is an object of the present invention to provide a bearing protection device for a marking machine that can overcome maintenance difficulties.

[Means for Solving the Problems]

The bearing protection device of the stamping machine of the present invention is such that the upper part of the ink transfer roller attached to the shaft whose both ends are supported by each bearing is not seen below the ink pot containing the ink containing organic solvent and having large surface tension. In a bearing protection device of a marking machine that supplies ink to a marking rubber with a uniform thickness through an ink kneading roller circumscribing the ink transfer roller, in the shaft at a position between each of the bearings and the ink transfer roller. A disc-shaped flinger having water repellency, organic solvent resistance and elasticity is press-fitted.

[Action]

Examples of the material having water repellency, organic solvent resistance and elasticity include fluororesin, silicon resin, polypropylene, polyethylene and the like.

The flinger has water repellency (also called hydrophobicity) and also repels organic solvents well, preventing ink from overcoming the flinger from the shaft and infiltrating into the bearing. Will drip from. Since it has organic solvent resistance, it can be used for a long time even if it comes into contact with ink. Since it has elasticity, it can be easily fixed to the shaft by press fitting, does not require axial dimension, and ink does not penetrate into the press fitting part.

Since the ink does not enter the bearing in this way, the various problems described above are solved.

〔Example〕

FIG. 1 is a front sectional view of an embodiment, and FIG. 2 is a schematic side view of a marking machine using the one shown in FIG. Those given the same reference numerals as in the conventional example have approximately the same function.

In the figure, the ink pot 2 storing the ink 1 is composed of side plates 3a, 3b and the like. Bearing 5 mounted on bearing frame 4
The upper part of the ink transfer roller 7 attached to the shaft 6 supported by the above is partially seen in the lower part of the ink pot 2.

Although not shown in the conventional example, the ink transfer roller 7 applies the ink 1 thinly and evenly to the plurality of marking rubbers 9a attached to the outer periphery of the marking rubber roller 9 through the plurality of ink kneading rollers 8a, 8b and 8c. To do. Then, characters or the like are imprinted on the surface of the object 11 to be imprinted such as semiconductor products via the transfer drum 10.

The process up to this point is the same as that of the conventional example 1, but as a characteristic structure, the shaft 6 located between the bearing 5 and the ink transfer roller 7 is provided with water repellency, organic solvent resistance, and elasticity. A disk-shaped flinger 21 made of material is press-fitted.

As an example of the material having the above characteristics, a fluorine-based resin such as polytetrafluoroethylene is suitable, and in addition, a silicon-based resin, polypropylene, polyethylene or the like may be used.

As shown in the drawing, the flinger 21 has a flat surface on the bearing 5 side and a conical surface on the inner side to form an acute angle on the outer circumference, but in addition, a flat surface on both sides and one or more grooves on the outer circumference. But it's okay.

Due to the water repellency, the ink 1 leaking from the ink pot 2 adheres as shown in FIG. 1a, drops as ink droplets 1b, and does not permeate from the press-fitting portion, so the ink may enter the bearing 5. There is no. The temperature rise of the bearing is actually 35deg to 2
It dropped to 5deg.

[Effect of device]

The bearing protection device of the stamping machine of the present invention is such that the upper part of the ink transfer roller attached to the shaft whose both ends are supported by each bearing is not seen below the ink pot containing the ink containing organic solvent and having large surface tension. In a bearing protection device of a marking machine that supplies ink to a marking rubber with a uniform thickness through an ink kneading roller circumscribing the ink transfer roller, in the shaft at a position between each of the bearings and the ink transfer roller. Since the disk-shaped flinger having water repellency, organic solvent resistance, and elasticity is press-fitted, there is an effect that the ink is prevented from penetrating into the bearing beyond the flinger, and therefore the ink Improper bearing lubrication due to infiltration, increase in rotational frictional force, imperfect drying of ink on the ink transfer roller due to temperature rise, and imperfect marking such as bleeding or bleeding, bearing maintenance It has the effect of being free from the frequency and difficulty, and has the effect that problems that cannot be solved even with a shaft sealing device are solved with a flinger that does not take up space, and that it is particularly suitable for small-sized stamping machines targeting small stamped objects. .

[Brief description of drawings]

FIG. 1 is a front sectional view of an embodiment, FIG. 2 is a schematic side view of a marking machine using the one shown in FIG. 1, and FIG. 3 is a view of a conventional example 1 showing the vicinity of an ink transfer roller of the marking machine. Front sectional view, 4th
FIG. 5 is a front view of Conventional Example 2, FIG. 5 is a front view of Conventional Example 3, and FIG. 6 is a front view of Conventional Example 4. 1,1a, 1b ... Ink, 2 ... Ink pot, 5 ... Bearing, 6 ... Shaft, 7 ... Ink transfer roller, 9a ... Stamp rubber, 21 ... Flinger.

Claims (1)

[Scope of utility model registration request] 1. An ink transfer roller mounted on a shaft whose both ends are supported by respective bearings is looked into the lower part of an ink pot containing an ink containing an organic solvent and having a large surface tension. In a bearing protection device of a stamping machine that supplies ink to a stamping rubber with a uniform thickness through an ink kneading roller that is circumscribed, a water-repellent and organic-resistant material is provided on the shaft at a position between each bearing and the ink transfer roller. A bearing protection device for a stamping machine, wherein a disk-shaped flinger having solvent properties and elasticity is press-fitted.