JPH041672A - Bearing device for optical carriage - Google Patents

Abstract

PURPOSE:To fit a bearing to a frame extremely easily by fitting the bearing into the hole of the frame and then engaging a bearing holder for holding said engagement with the cuts of the frame with lock projections made of elastic members. CONSTITUTION:The cylinder part 12a of the bearing 12 is inserted into the hole 11 of the frame 10 to the position where a flange 12b contacts the frame 10. Then while the bearing pressure part 13 of the bearing holder 13 presses the flange 12b while covering it, the elastic projection parts 13b are locked in the cuts 11a formed in the frame 10 with elastic force. The outer diameter of the cylinder part 12a and the internal diameter of the hole 11 are set to such size that they engage each other and the fitting position of the bearing 12 is determined simultaneously with the insertion of the bearing 12 into the hole 11. Consequently, the bearing can be fitted to the frame of the optical carriage by one operation and no adhesive is used, so the fitting operation is carried out efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a bearing device for a carriage of an optical system that exposes and scans a document in an electrophotographic copying machine or the like.

2. Description of the Related Art Conventionally, as an optical carriage for exposing and scanning a document in an electrophotographic copying machine, a frame 1 is used as shown in FIG.
A known structure is such that a bearing housing 2 is attached to the bearing housing, a bearing 3 is inserted into the bearing housing, and the bearing is held with screws 4. However, in this configuration, the bearing is held by a screw, so if you tighten the screw to increase the holding force, the bearing will deform and the carriage will not be able to slide smoothly. Therefore, it was necessary to prevent deformation of the bearing by weakening the holding force to a practically allowable limit.In other words, it was necessary to strictly control the force when tightening screws.Thus, these problems were solved. As a means to do this, attempts have been made to fix the bearing to the bearing housing with an adhesive to hold the bearing without deforming it.

Problems to be Solved by the Invention However, with the above configuration, when fixing the bearing to the bearing housing with adhesive, it takes time for the adhesive to solidify and exert its holding power, which reduces production efficiency. There was a problem. Furthermore, if the adhesive adheres to the sliding surface of the bearing, it will have a significant negative effect on the original function of the bearing, so the adhesive must be applied carefully, which poses a problem in terms of workability.

The present invention has been made in view of the above-mentioned problems, and is an optical carriage that makes it extremely easy to attach a bearing to a frame without using adhesive or deteriorating the sliding performance of the bearing such as deformation. The purpose of the present invention is to provide a bearing device.

Means for Solving the Problems In order to solve the above problems, the present invention provides a frame having at least one notch and a hole into which a bearing is inserted, a bearing that fits into the hole of the frame, and a frame having a hole into which a bearing is inserted. The structure includes a bearing rod portion that holds the bearing, and a bearing holder that includes an elastic protrusion that engages with the notch. Further, the present invention provides a frame in which at least one notch is stepped and a hole into which a bearing is inserted is formed, a cylindrical portion that fits into this frame, and an elastic protrusion that engages with the notch. The structure consists of a formed bearing.

Function Since the present invention has the above-described configuration, when holding the bearing on the frame of the carriage, the bearing can be held without impairing its sliding performance at all, and since no adhesive is used, it can be mounted efficiently. can do the work.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of an optical carriage according to an embodiment of the present invention, FIG. 2 is a sectional view of a bearing portion, and FIG. 3 is an exploded perspective view showing the structure of the bearing portion.

Reference numeral 10 denotes a frame of an optical carriage, in which a hole 11 forming a bearing and at least one notch lla are formed. 12 is a cylindrical portion 12a that fits into the hole 11 and a flange 1;
2b is the bearing formed, 13 is the flange 12 of the bearing 12.
Bearing rod part 13a that holds while wrapping b.
The bearing holder is formed with at least one elastic protrusion 13b that engages with a notch lla formed in the frame 10.

Next, a method of assembling the bearing device having the above configuration will be explained.

The cylindrical portion 12a of the bearing 12 is inserted into the hole 11 of the frame 10 until the flanges] and 2b contact the frame 10. Subsequently, while holding the flange 12b so as to wrap it around it with the bearing rod part 13a of the bearing holder 13, the elastic protrusion part 13b is locked in the notch lla formed in the frame 10 by elastic force.

The outer shape of the cylindrical portion 12a and the inner diameter of the hole 11 are dimensioned to fit together, and the mounting position of the bearing 12 is determined at the same time as the bearing 12 is inserted into the hole 11. That is, the accuracy of mounting the bearing holder 13 does not adversely affect the positional accuracy of the bearing 12.

As described above, according to this embodiment, the bearing can be attached to the frame of the optical carriage with one touch, and since no adhesive or the like is used, the attachment can be carried out efficiently.

FIG. 4 is an exploded perspective view showing the structure of a bearing portion according to a second embodiment of the present invention. In this embodiment, the bearing and the bearing holder are integrated, and the bearing 14 has a cylindrical portion 14.
a and at least one elastic protrusion 14b. When assembling the bearing device in this embodiment, the cylindrical portion 14a is inserted into the hole 16 formed in the frame 15 of the optical carriage, and the elastic protrusion 14b is engaged with the notch 16a formed in the frame 15 by its elastic force. Just make it stop.

According to this embodiment, since the positional accuracy of the bearing is determined by the cylindrical portion 14a, the accuracy of the elastic protrusion 14b does not affect the bearing positional accuracy, and moreover, the bearing and the bearing holder are integrated. Therefore, the installation work can be performed more efficiently than in the first embodiment.

Effects of the Invention As described above, in the optical carriage bearing device of the present invention, after the bearing is fitted into the hole of the frame, the bearing holder for holding the bearing is attached to the notch of the frame with the locking protrusion made of an elastic member. The sliding performance of the bearing may be impaired because the bearing itself is configured to lock into a notch in the frame, or the bearing itself has an elastic locking protrusion that locks into a notch in the frame. There is no need to use adhesives, etc. during assembly, and since there are no screws, there is no need to use tools. are doing.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of an optical carriage according to a first embodiment of the present invention, FIG. 2 is a sectional view of its bearing portion, and FIG. 3 is an exploded perspective view showing the structure of the bearing portion. FIG. 4 is an exploded perspective view showing the structure of a bearing portion according to the second embodiment, and FIG. 5 is a sectional view of the bearing portion of a conventional optical carriage. 10.15... Frame, 12.14...
...Bearing, 12a, 14a... Cylindrical part, 12b
-...Flange portion, 11.16...Bearing insertion hole, 11a. 16a... Notch, 13... Bearing holder 13a... Bearing holding part, 13b, 14b
・・・・・・Elastic protrusion.

Claims (2)

[Claims] (1) A frame provided with at least one notch and a hole into which a bearing is inserted, a bearing that fits into the hole of this frame, a bearing holding part that holds this bearing, and a frame that engages with the notch. A bearing device for an optical carriage, comprising a bearing holder having a mating elastic protrusion. (2) A frame having at least one notch and a hole into which a bearing is inserted, a cylindrical part that fits into this frame, and an elastic protrusion that engages with the notch are integrally formed. A bearing device for an optical carriage characterized by comprising a bearing.