JP2003120666A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for obtaining highly accurate roller rotating accuracy. SOLUTION: This bearing device has: a bearing 2 having a moving body between an outer race and an inner race; a housing 4 for housing the bearing 2; front lids 5 and 6 for fixing the outer race of the bearing from the side; a bearing nut 7 for fixing the bearing; and a spacer 3 arranging a distance between the bearing, or a spacer arranged between a the bearing 2 and the bearing nut 7, and supports a shaft part of a main roller in a converting device. Since the device is characterized by fixing the bearing by adjusting a fastening condition of the bearing nut 7 while measuring stress by a strain sensor by installing the strain sensor in the spacer 3 or the spacer, the bearing nut 7 is surely and uniformly fasten by controlling a preload by a numeric value. Thus, the bearing is easily adjusted in a proper installing attitude, and the highly accurate roller rotating accuracy is obtained. Time for installation and adjustment is also shortened.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a converting apparatus for rotating a plurality of rolls such as a plate cylinder and an impression cylinder to perform printing and coating. The present invention relates to a bearing device that supports a shaft portion of a roll. 2. Description of the Related Art Generally, a converting apparatus such as a gravure printing machine or a coater machine rotates a plurality of rolls including a plate cylinder and an impression cylinder to convey a web, and forms a web between the rolls. On the other hand, it has a structure for performing desired processing such as printing and coating. When high-precision roll rotation accuracy (rotational runout and runout in the thrust direction) is required for main rolls such as plate cylinders and impression cylinders, combined angular contact ball bearings and double row tapered roller bearings are used. Bearing devices are often employed. [0003] When assembling such a bearing, the assembling posture and preload control are very important. In particular, when the back-to-back combined bearing 2 is fixed to the shaft of the main roll 1 as in the back-to-back roll bearing assembly example shown in FIG.
The method of tightening the bearing nut 7 has a great effect on the rotational accuracy of the main roll 1 and the rigidity of the bearing. In FIG. 1, 3 is a spacer, 4 is a housing, and 5 and 6 are front covers. They are provided on both sides of the fixed end side (right side) and the free end side (left side), respectively. In the bearing device shown in FIG. 1, the tightening state of the bearing nut has been managed in the following manner. That is, "1) the tightening of the bearing nut is managed by a torque wrench.", "2) The roll rotation accuracy after the tightening is measured, and the tightening is performed again according to the measurement result. In some cases, this is repeated." It is generally managed by such a method. [0006] Among the tightening management of the bearing nut described in the prior art, in the management by the torque wrench, the individual difference depending on the wrench used, the friction state between the bolt and the female screw portion (lubricating oil) , Etc.) greatly affects the tightening state of the bearing nut. Also, it is difficult to determine the correlation between the tightening amount and the appropriate value of the preload. Also,
In the management by measuring the roll rotation accuracy and retightening, there is a problem that a load and time for adjustment are required. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to fix a bearing, adjust a proper mounting posture of a bearing, and obtain a high-precision. An object of the present invention is to provide a bearing device capable of obtaining roll rotation accuracy. [0008] To achieve the above object, a bearing device of the present invention comprises a bearing having a moving body between an outer ring and an inner ring, a housing for accommodating the bearing, and a side member. A front lid for fixing the outer ring of the bearing, a bearing nut for fixing the bearing, a spacer for providing a distance between the bearings, or a spacer installed between the bearing and the bearing nut, and converting. In a bearing device that supports a shaft portion of a main roll of the device, a strain sensor is attached to the spacer or the spacer, and while measuring the stress with the strain sensor, adjusting the tightening of the bearing nut and fixing the bearing. It is characterized by. DETAILED DESCRIPTION OF THE INVENTION A bearing device according to the present invention is a converting device for rotating and driving a plurality of rolls to convey a web and performing desired processing such as printing or coating on the web between the rolls. It is used for the device and is for supporting the main roll in the converting device. Hereinafter, embodiments of the present invention will be described with reference to specific examples. In the bearing device of the present invention, as shown in FIG. 2, a bearing (angular ball bearing or double-row tapered roller bearing) is provided on both sides of the fixed end and the free end of the main roll 1 in advance. 2. A spacer 3, a housing 4, and a front lid 5 are provided to provide a distance between bearings in order to make the structure resistant to the moment due to the weight of the roll. Then, from this state, the bearing nut 7 is assembled to fix the bearing. Assemble the front lid 6 last. Then, as shown in FIG. 3, in the spacer 3,
The strain sensor S is previously mounted at a position where the strain generated when the bearing is fixed can be detected. When the inner ring is pressed by the bearing nut 7, the strain generated in the outer spacer is measured by the strain sensor S, and the bearing nut 7 is tightened while fixing the proper pressurization, thereby fixing the bearing inner ring. As a result, numerical management of the preload becomes possible, and an appropriate preload can be applied to the bearing. The strain sensor may be mounted at any position as long as the strain can be detected. For example, as shown in FIG. 4, different shaft diameters inside and outside the main roll can be adjusted.
With a configuration having a spacer for ensuring a perpendicularity between the shaft and the bearing nut 7, preload control can be performed by attaching the sensor S to the spacer regardless of the presence or absence of the spacer. When the bearings are face-to-face combinations, as shown in FIG. 5, when the outer ring is pressed by the front lid 6, the strain generated in the inner spacer is measured by the sensor S, and an appropriate preload is applied. The tightening of the bolts while confirming that the preload is maintained enables preload management. As described above, the present invention has been described in detail based on the embodiments. However, the bearing device according to the present invention is not limited to the above embodiments at all, and does not depart from the gist of the present invention. Naturally, various modifications are possible. According to the bearing device of the present invention, there are provided a bearing having a moving body between an outer ring and an inner ring, a housing for accommodating the bearing, a front lid for fixing the outer ring of the bearing from the side, and a bearing. A bearing nut for fixing the shaft of a main roll in a converting device, comprising: a bearing nut for fixing the shaft; and a spacer provided between the bearing and a spacer provided between the bearing and the bearing nut. In the above, a strain sensor is attached to the spacer or the spacer, and while measuring the stress by the strain sensor, the tightening of the bearing nut is adjusted and the bearing is fixed, so that the preload is managed numerically. The bearing nut can be securely and uniformly tightened, which makes it easy to adjust the bearing to the proper mounting position and achieves high-precision roll rotation accuracy. You. Further, it is possible to reduce the time for assembling adjustment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram showing a bearing device in a conventional converting device. FIG. 2 is an explanatory view showing an example of assembling the bearing device of the present invention. FIGS. 3A and 3B are a front view and a side view showing an example in which a strain sensor of the bearing device of the present invention is mounted on an outer spacer. FIG. 4 is an explanatory view showing an application example in which a strain sensor of the bearing device of the present invention is mounted on a spacer. FIG. 5 is an explanatory view showing an application example in which the strain sensor of the bearing device of the present invention is attached to the inner spacer. [Description of Signs] 1 Main roll 2 Bearing 3 Spacer 4 Housing 5, 6 Front lid 7 Bearing nut S Strain sensor

   ────────────────────────────────────────────────── ─── Continuation of front page    F-term (reference) 3J012 AB04 BB03 BB05 CB01 FB10                       HB02                 3J101 AA02 AA42 AA54 AA62 AA81                       BA71 FA01 FA41 FA46 GA60                 3J103 AA02 AA83 CA01 CA64 DA05                       DA06 DA07 FA17 FA18 GA02                       GA54 HA08

Claims (1)

Claims 1. A bearing having a moving body between an outer ring and an inner ring, a housing for accommodating the bearing, a front lid for fixing the outer ring of the bearing from the side, and a bearing for fixing the bearing. A bearing for supporting a shaft portion of a main roll in a converting device, comprising a spacer for providing a distance between the bearing and a bearing or a spacer provided between the bearing and the bearing nut. A bearing device wherein a strain sensor is attached to a seat or a spacer, and while the stress is measured by the strain sensor, the tightening of a bearing nut is adjusted to fix the bearing.