JPH0453642Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a document table of an image forming apparatus such as a document table movable type electrophotographic copying machine or a facsimile machine using a guide rail such as AcyuRide rail (product name). It is something.

(Prior Art) Conventionally, electrophotographic copying machines have been known to include a fixed document plate type copying machine in which an optical system moves to read a fixed original, and a moving document platen type copier in which an optical system moves to read the original document. There is.

(Problems to be solved by the invention) In the latter case, since the image is read while the document table is moving, if the movement itself is not smooth, there is a drawback that the formed image will be blurred or uneven. In other words, the image is read while the impact when the document table starts to move, the vibrations during movement, etc. are directly transmitted to the document, causing the above-mentioned image deterioration. In addition, many of the copying machines with moving document table are inexpensive, small and lightweight, so
The problem is that the vibration of the machine itself is easily transmitted to the document table, and the installation location is not limited to a stable location.
They are often installed on tables that are prone to vibration or in unstable locations. In such a case, the document table is more likely to be affected by vibrations when moving, and the above-mentioned image deterioration is more likely to occur.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a movement guide mechanism for a document table that reciprocates the document table on which the document is placed relative to the main body of the apparatus when scanning the document. A first rail fixed to the apparatus main body side, and a second rail fixed to the document table side that is guided by the first rail with a sphere in between and moves back and forth by a driving means.
The device is characterized in that it has a rail and an elastic member that biases the second rail in one direction so that the second rail does not have play with the sphere.

(Example) FIG. 1 shows an example of a document table to which the present invention is applied.

In this embodiment, a rail 2 supporting and guiding the document table 1 is used.
As such, we use Akyu Ride Rail (product name). This rail 2 is connected to the device main body 4 via the sphere 3.
It has a first rail 5 fixed to the side and a second rail 7 to which a transparent plate 6 such as glass is fixed.

In this embodiment, an elastic member 8 such as urethane rubber fixed to the device main body 4 is connected to the second rail 7.
are always in pressure contact. As a result, a constant load is always applied when the document table 1 is moved.
The elastic member 8 can absorb shocks during startup and vibrations during movement, and can prevent deterioration phenomena such as blurring and unevenness in images.
Since the elastic member is in pressure contact with the second rail in one direction in this way, it is possible to simultaneously absorb vibrations of the rail itself and the installation location.

In the above embodiment, the elastic member 8 was fixed to the main body of the apparatus and engaged with the second rail 7, but it was attached to the second rail 7 as shown by the chain line in FIG. 1, and its lower end was connected to the main body of the apparatus. It may be abutting engagement. Furthermore, both may be attached at the same time. Further, the relationship between the lengths of the elastic member and the rail is determined based on the effect of absorbing vibrations, or based on the elastic force of the elastic body.

(Effect of the invention) Since the above structure engages the elastic member near the supporting means of the document table, vibrations are not generated in the document table compared to when an elastic member is engaged with the free end of the document table. The vibration and shock caused by driving the document were well absorbed.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view showing the attachment relationship between a guide rail and an elastic member according to an embodiment of the present invention, and FIG. 2 is a perspective view of the main body of the apparatus as viewed from the back side. In the figure, 1 is a document table, 2 is a rail, 4 is the main body of the apparatus, 5 is a first rail, 7 is a second rail, 8,
8a indicates an elastic member.

Claims (1)

[Scope of Claim for Utility Model Registration] In a movement guide mechanism for a document table that reciprocates a document table on which a document is placed relative to the device body when scanning a document, a first rail fixed to the device body side; a second rail fixed to the document table side that is guided by the first rail with the sphere in between and reciprocated by a driving means; A movement guide mechanism for a document table, comprising: an elastic member that biases in one direction.