JPS5839462Y2 - Copy machine document table movement prevention device - Google Patents

Description

[Detailed Description of the Invention] The present invention is a device for preventing movement of the original platen of a copying machine, more specifically, a device for preventing movement of the original platen of a copying machine. This invention relates to a device that prevents a person from moving from a home position.

Conventionally, in this type of small-sized copying machine, an original platen weighing roller supported on the copying machine body is pressed onto a flat rail of a guide groove formed on the original platen, and the sliding contact portion between the original platen weighing roller and the flat rail is A copying machine is known in which a document table is movable back and forth with respect to the main body of the copying machine using the copying machine as a guide.

However, with this configuration, when the document holding plate is opened and a document is set on the document table, the document table moves from the home position, that is, the copying start position.

Therefore, as shown in FIG. 1, the document table weighing roller b supported on the copying machine body a is kept pressed onto the flat rail e in the guide groove d formed in the document table C by a spring f.
A stopper h having a recess g into which the original platen weighing roller b fits is fixed to the flat rail e, and when the original platen C returns to the home position, the original platen weighing roller b moves to the step (convex part) of the stopper h. It has been proposed that when a document is set on the document table C by climbing over h' and fitting into the recess g, the document table C does not move from its home position.

Note that in FIG. 1, i is a drive roller that is pressed against the lower end surface j of the document table C.

However, with this structure, when the document table C is driven by the drive roller i during the copy cycle, the document table weighing roller b will go over the convex part h' of the stopper h, so at this time, vibrations will be generated in the optical system etc. This has the problem of deteriorating the copy quality due to the transfer of data.

The present invention was developed in view of the above circumstances, and its purpose is to prevent the document table from moving from its home position when setting an original on the document table, and to prevent the document table from moving during the copy cycle. Another object of the present invention is to provide a document table movement prevention device for a copying machine that can prevent vibration from being applied to an optical system or the like.

Embodiments of the present invention will be described below with reference to FIG. 2 and subsequent figures.

FIG. 2 is a partially cutaway perspective view showing a copying machine of a movable document table type, in which a document table 2 is provided in a main body 1 of the copying machine so as to be movable back and forth.

The document table 2 has a structure in which a transparent glass 4 is fitted into a frame 3.The document holding plate 5 is opened, a document 6 is set on the transparent glass 4, and the document is moved over an illumination light 7 provided in the copying machine body 1. By doing so, the original image is scanned.

The flat surfaces 31a of the pair of left and right frames 31, which are parallel to the direction of movement of the frame 3, come into contact with a drive roller 8 provided on the copying machine main body 1, and the drive roller 8 can be rotated forward or backward by a control mechanism (not shown). Rotationally driven.

Further, rollers 10 are respectively attached to one ends of the pair of left and right frames 31 via supports 9, and each roller 10 is attached to a guide rail 11 fixed to the left and right side plates 1a, la of the copying machine main body 1. They are supported by being inserted into each.

On the other hand, a pair of left and right frames 31 in the frame 3 of the original platen 2 are provided with outward U-shaped guide grooves 12 over almost the entire length thereof.
On a, an original platen weighing roller 13 provided on the side plate 1a is inserted from both sides of the original platen 2 so as to rotate while pressing the original platen 2 against the drive roller 8.

That is, the document table weighing roller 13 has one end pivotally attached to the side plate 1a, and the other end rotatably supported by a support 15 which is biased downwardly by a spring member 14.

Reference numeral 16 denotes an original platen locking member, which is provided at the other end of the guide groove 12 of the frame 31 so as to engage with the original platen weighing roller 13 when the original platen 1 is at the home position.

The document platen locking member 16 has a base end of a plate spring 19 fixed to a block 18 fixed in the guide groove 12 with a screw 17, and the tip of the plate spring 19 is connected to a base inclined part 19a and a central smooth part 19b.
The planar rail 12 a in the guide groove 12 is formed into a U-shape facing the road by the tip inclined portion 19 C and
An elastic body 2 such as urethane foam is placed on the upper wall 12b facing the
0 is fixedly installed so as to be in contact with the central smooth portion 19b.

Note that the elastic body 20 may be provided at the central smooth portion 19b of the leaf spring 19 so as to be in contact with the upper wall 12b.

Next, the operation will be explained.

When the document table 2 reaches the home position, the document table weighing roller 13 deforms the plate spring 19 and the elastic body 20 upward to enter between the plate spring 19 and the plane rail 12a, as shown in FIG.

As a result, the original plate weighing roller 13 is pressed against the flat rail 12a by the elastic deformation reaction force of the leaf spring 19 and the elastic body 20, and when the original holding cover 5 is opened and the original 6 is set on the original plate 2, the original plate weighing roller 13 is 2 can be reliably prevented from moving from its home position.

Also, when the document table 2 moves during the copy cycle, one leaf spring and the elastic body 20 are used as the document table weighing roller 13.
is elastically deformed upward by the plane rail 1, and the reaction force is
2a, since it is supported by the drive roller 8, no vibration is applied to the document table weighing roller 13.

Therefore, vibration is not imparted to the optical system, etc., and copy quality is prevented from deteriorating.

Note that in the above embodiment, the document platen locking member 16 is connected to the plate spring 1.
9 and the elastic body 20, it goes without saying that only the leaf spring 19 may be used, and a pair of leaf springs 19 may be provided on the left and right sides, or only one of the leaf springs 19 may be provided.

Since the present invention is configured as described above, when a document is set on the document table 2, it is possible to prevent the document table 2 from moving from the home position, and even if the document table 2 is moved during the copy cycle, the optical system It is possible to prevent vibrations from being applied to other parts.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of a conventional example, Fig. 2 is a partially cutaway perspective view showing an embodiment of the present invention, Fig. 3 is a detailed explanatory diagram of the document platen locking member, and Fig. 4 is an explanatory diagram of its operation. It is. 1 is the main body of the copying machine, 2 is the document table, 12a is the flat rail, 1
3 is a document table weighing roller, and 16 is a document table locking member.

Claims (1)

[Scope of utility model registration request] In a copying machine of the type in which a document table 2 moves back and forth with respect to a copying machine main body 1, a planar rail 12a extending in the direction of movement of the document table 2 is provided on the document table 2, and a planar rail 12a is provided on the document table 2. A platen weighing roller 13 is attached to the copying machine main body 1 so as to be in contact with the platen weighing roller 13 in the copying machine body 1 so as to bias the platen rail 12a in the direction of pressing the platen rail 12a. a document platen member attached to the side opposite to a and elastically deforms when the document platen weighing roller 13 passes, and restrains the document platen weighing roller 13 in the moving direction of the document platen 2 at the home position of the document platen 2; A document table movement prevention device for a copying machine, comprising a stop member 16.