JPS5812176Y2 - Light-shielding mask for copiers - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a light shielding mask that covers the platen (contact glass) surface of a copying machine.

A typical copying machine includes a platen cover that is pivoted at one end.

However, when copying a document that cannot be covered with such a platen cover, such as a thick book, the strong light from the copying machine will directly shine into the operator's eyes, making the copying process painful.

Further, in a slit exposure type copying machine, the area where the original is not placed becomes a black border and cannot be used.

As a countermeasure for such cases, the part of the platen where the original is not placed has been covered with cardboard or the like each time.

However, this process is not only time-consuming, but also causes misalignment of the original when covering the exposed parts with thick paper, and there are also cases where the original is covered with thick paper, and many people copy without noticing this situation. There were many cases where this failed.

Furthermore, in a device as seen in Japanese Utility Model Application Publication No. 49-48442, in which four blinds are inserted and removed from the four sides of the platen toward the center, the structure becomes unnecessarily complicated. There is a problem in that the original image cannot be copied at a predetermined position.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a simple and easy-to-operate device that can always align the portion to be copied in a fixed position on copy paper.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

Figure 1 shows a copying machine equipped with the device of the present invention. 1 is the main body of the copying machine, 2 is a platen on the main body, a is a thick document to be copied, and 31 is a horizontal mask knob. , 41
indicates the vertical mask knob.

FIG. 2 shows an embodiment of the device which is the main part of the present invention and is disposed directly below the platen 2 on the main body 1.
5 is a frame body, 6, 6 are guide grooves for the horizontal mask 3 provided on the front and rear of the frame body 5, 7, 7 are guide grooves for the vertical mask 4 provided on the left and right sides of the frame body 5; , horizontal guide grooves 6, 7
are said to be at different levels above and below.

32 is a tension roll for the horizontal mask 3 which is pivotally supported on one side of the frame 5, and 33 is a winding roll thereof, which is provided with a weak biasing spring in the winding direction.

Reference numeral 42 denotes a tension roll for the vertical mask 4, which is pivotally supported at the rear of the frame 5, and 43 is a take-up roll thereof, which is provided with a weak biasing spring in the winding direction like the horizontal take-up roll.

Each knob 31 of the horizontal mask 3 and the vertical mask 4,
41 come out from the guide grooves 6 and γ and face upward, respectively, and the first
As shown in the figure, a sliding groove 89 is bored on the top surface of the main body 1.
It stands out from 9.

Further, the horizontal sliding groove 8 is marked with a scale 81 with the right side as a reference, and the vertical sliding groove 9 is also marked with a scale 91 with the front side as a reference.

Next, to explain this operation, a thick document a to be copied is placed on the platen 2 with the front side and right side as reference in this example.

This determines the vertical and horizontal positions where the platen 2 should be shielded, so move each knob 31 and 41 along the horizontal and vertical sliding grooves 89. Each mask 3, 4 has a winding roll 33, 43
The shield is pulled out against the biasing spring, and the shielding is completed.

Although the masks 3 and 4 are pulled by the weak force of the biasing spring, they do not return and are kept stretched without loosening.

The front edge of each mask 3, 4 forms an edge 34, 44 that clearly demarcates the shielding part, and the edge 34, 44 moves parallel to the front side and the right side of the frame 5, respectively. is required.

For this reason, each mask 3, 4 has sliding pieces 35, 45 on both sides.
are provided and slid into the respective guide grooves 6 and 7 to ensure parallel movement.

The second embodiment shown in FIG. 2 places particular emphasis on parallel movement of the masks 3 and 4 in the horizontal and vertical directions, and is rotatable along the front edge of the frame or the main body of the copying machine. Pulleys 47 are fixed to the left and right sides of the attached shaft 46, and the pulleys 47 wind up and unwind thin wires 48 attached to the left and right sides of the vertical mask 4, thereby moving the vertical mask in parallel. The end of this shaft 46 protrudes outside the main body of the copying machine, and a rotation knob 49 is attached thereto.

Similarly, the horizontal mask 3 also has a shaft 3 provided in the frame or main body.
6 pulley 37 is stretched with a thin wire to ensure parallel movement.

Note that the scale 81. provided in the sliding groove 8.9 on the main body.
91 is extremely useful for shielding the platen before placing the original.

As described above, according to the present invention, the two sheet-like light-shielding members are provided so that they can be pulled out in the direction of the reference edge in order to cope with the document placement reference edge, so that the original can be copied even though it is a simple device. Not only can the portion to be copied be always aligned at a fixed position on the copy paper, but also the operability can be significantly improved since it is only necessary to operate two light-shielding plates.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a copying machine to which the present invention is applied;
FIGS. 2 and 3 are perspective views of an apparatus showing an embodiment of the present invention. 2...Platen, 3...Horizontal mask, 4...Vertical mask, 5...Frame body,
6,1...Guide groove, 31.41...Knob.

Claims (1)

[Scope of utility model registration request] Two vertical and horizontal winding rolls are installed below the platen and at the reference edge for document placement, and each roll winds up one end of the sheet-like light-shielding member, and the other end of each light-shielding member is copied. A light-shielding mask for a copying machine, characterized in that it is stretched so as to be pulled out in the direction of the reference edge using a knob provided on the outside of the machine body.