JPS59100431A - Original cover for copying machine - Google Patents

Abstract

PURPOSE:To hold securely an original with an original cover and to prevent the original from shifting position during movement and flying by a wind blast in opening, by holding the original suctionally through plkural air holes of the cavity of the original cover. CONSTITUTION:The original cover 5 consists of an external plate 6 and an internal wall member 7 and the cavity 8 is formed therein. The original pressing surface wall 7a of the member 7 has numbers of suction holes 7d; and a suction pipe 9 communicating with the coavity part 8 is connected airtightly to the opening 7c of a side wall 7b of the member 7, and the pipe 9 is connected to the blower in a main frame 2. The formation width (w) of holes 7d and the length L of an original of minimum size which can be copied are so determined preferably that L/3<=w<=2L/3. The cover 5 is closed to start suction when copying operation is started, and the suction is stopped after an enough time to take the original P out by opening the cover after the copying operation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document cover structure for a copying machine.

The document holding surface of a document cover for a copying machine that uses a sheet document is formed of a rubber sheet, plastic sheet, or the like with a smooth surface so that the document can be brought into close contact with the surface of the document table. However, if you place a document on the document table, cover it with a document cover, and make a copy, and then open the document cover, the document may be attached to the document cover depending on the opening method or the paper quality of the document. Phenomena such as the original being lifted up and flying to the side, or the original sticking tightly to the surface of the original plate, making it difficult to take out, may occur.

Alternatively, in a copying machine with a movable copying table, even though the document is held down by the document cover, the shock caused by the movement of the document table causes the document to shift from its registration position on the document table. It was common.

The present invention was devised against an understandable technical background, and
The document cover for a copying machine is characterized in that the interior thereof is hollow, an intake pipe is connected to the cavity, and a plurality of intake holes are opened in the document holding surface of the document cover.

SUMMARY OF THE INVENTION An object of the present invention is to prevent misalignment of a document during copying and to facilitate removal of the document after copying is completed.

The present invention will be explained below with reference to the embodiments shown in FIGS. 1 to 6.

A document table (hereinafter referred to as a platen glass) 4 is disposed on the top surface of the main body 2 of the copying machine 1, and the top surface thereof can be covered with a tiltable original cover 5 ( See Figure 1 []q).

For copying, the sheet-like original plate P is aligned with the registration guide 3, set on the platen glass 4, and the original cover 5 is closed to perform copying.

The document cover 5 is made up of an outer panel 6 and an inner wall member 7 of a tray airtightly joined to the outer panels, and the inside thereof is a cavity (8) (Fig. 1, (See Figure 2)
. A large number of air intake holes 7d are formed in the document holding surface wall 71& of the inner wall member 7, and an air intake pipe 9 communicating with the cavity 8 is airtightly connected to the opening 7c formed in the one side wall 7b of the inner wall member 7. It is connected. The other end of this intake pipe 9 is connected to a blower inside the copying machine main body 2.

Further, the copying machine 1 is a so-called center registration type in which the original P is aligned at the center position of the front and back rotation of the platen crow 4, and the original P is placed near the registration guide 3. An air intake hole 7d is provided in the original holding surface wall 7a so as to cover the entire width of one side PI.
is formed.

It is preferable that the relationship between the width W of the intake hole 7d and the length L of the minimum size document that can be copied be such that L/3<W2L/3.

Further, the timing for operating the blower installed in the copying machine main body 2 and sucking air from the intake hole 7d through the intake pipe 9 and the cavity 8 is when the document cover 5 is closed and copying is started. Also, the blower is configured to stop after a certain time delay from the end of copying. This certain period of time means sufficient time to open the document cover 5 and take out the document P after copying is completed.

In the above configuration, when the original P is placed on the platen glass 4, the original cover 5 is closed, and the copy start switch is pressed,
At the same time that copying is started, the air intake blower is started and air is taken in from the air intake hole 7d, and one side P1 of the original P is sucked into the original holding surface wall 7a. therefore,
Even if the copying machine is of a type in which the platen glass 4 moves, there is no fear that the set position of the document P will shift due to impact at the start and stop of movement. After copying, close the document cover 5.
When released, Haraaki P is lifted up as shown in FIG. 3 while being sucked into the suction hole 7d of the document holding surface wall 7a on one side P1, unlike in a conventional copying machine. as,
The original P does not fly off the platen glass 4 to the side. At this time, since the other side portion P2 hangs down from the document holding curved wall 7a, it is easy to grip the other side portion P2, and the document P can be easily taken out. After taking out Haraaki P, the suction blower will automatically stop.

As shown in FIG. It is preferable to provide an intake hole 17d\ or 27d in the document holding surface wall 17a of the document cover I5α so as to correspond to one side 13s or the other side 13bK (see FIGS. 4 to 6).

In this case as well, the width W of the intake holes 17d and 27d is preferably 1/3 to 2/3 of the side length b of the minimum document size that can be copied. By setting the relationship between W and L in this manner, the amount of hanging of the document P when the document cover 15 is opened is appropriate, and it becomes easy to take out the document P.

As is clear from the above description, in the present invention, the interior of the document cover for a copying machine is formed into a cavity, an intake pipe is connected to the cavity, and a plurality of intake holes are opened in the document holding surface of the document cover. Therefore, by inhaling air from the air intake hole through the air intake pipe and the cavity, the document for copying can be attracted to the document holding surface. Therefore, when copying with the document cover closed, even if the copying machine is of a type in which the document table moves, the shock caused by the movement of the document table may cause
There is no possibility of misalignment of the original. In addition, even when the document cover is opened after copying is complete, the document remains attracted to the document holding surface, so the document does not fly out to the side of the document table due to the wind pressure when the cover is opened, improving copying efficiency. do.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a copying machine equipped with a document cover according to an embodiment of the present invention, Fig. 2 is a cutaway view taken along line 1 - n in the 11th operation, and Fig. 3 is a use of the same copying machine. Perspective view showing the aspect, 4th
The figure is a perspective view showing how a copying machine with a document cover according to another embodiment is used, FIG. 5 is a plan view showing the document holding surface of the document cover θ, and FIG. FIG. 3 is a plan view showing a document holding surface of such a document cover. ■...9 copying machine, 2...copying machine body, 3. registration lane guide, 4... platen glass, 5...
Document cover, 6... Outer plate, 7... Inner wall member, 7a.
・Haraaki press wall, 7b...side wall, 7C...open hole,
7d...+lJ & pore, 8... Cavity, 9... Intake pipe, 1l... Copy machine, 13... Registration guide, 15... Original cover, 17a... Original Holding surface wall, 17d...Intake hole, 27
d...Intake hole.

Claims (1)

[Claims] In a type of copying machine in which a sheet-like original is placed on top of the original and the top surface is held down by the original cover, the inside of the original cover is formed into a cavity, and an intake pipe that communicates with the cavity is connected to the original cover. A document cover for a copying machine, characterized in that a plurality of air intake holes are opened in a document holding surface wall of the document cover, and the plurality of air intake holes are provided at positions that cover at least a portion of the document.