JPS63271486A - Cleaning device for lower face of original platen - Google Patents

Abstract

PURPOSE:To improve the performance for cleaning, and cooling the vicinity of a light source, by providing an original platen lower face cleaning device so that it can be switched freely to a first state which comes into contact with the lower face and a second state which is separated therefrom, and switching the state, based on a prescribed number of sheets as a reference. CONSTITUTION:An original platen cleaning device A is provided in the vicinity of the upstream in the feed and discharge paper direction to a light source 18, and a cleaning tool 31 consisting of a brush 29 and a holding member 30 is switched to a state which comes into contact with the lower face of a freely reciprocatable original platen 1 and a state which is separated therefrom, by an operation of a solenoid 32 by a control mechanism 33. Usually, the solenoid is degaussed and a spindle (b) is projected by a spring S, and the cleaning tool 31 provided continuously on the spindle abuts on the lower face of the platen 1. After the prescribed number of sheets have been copied continuously, the solenoid 32 is energized and separated from the lower base. When the state is switched by setting the prescribed number of copy sheets as a cleaning cycle, a temperature rise of the vicinity of the light source can be prevented, while cleaning satisfactorily the lower face.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cleaning device for the lower surface of a document table in a type of copying machine in which the document table is moved back and forth.

(Prior Art) As a cleaning device for the lower surface of the document table in the above-mentioned document table movable copying machine, there is a cleaning tool (a cleaning body such as a brush is provided on a holding member) that contacts the entire width of the bottom surface of the document table which is movable back and forth. There is a device in which a reciprocating motion of the document table is effectively utilized by providing a cleaning tool near the light source and cleaning the bottom surface of the document table with the cleaning tool each time the document table moves back and forth.

(Problems to be Solved by the Invention) By the way, copying machines are generally equipped with a cooling fan that exhausts air inside the machine to the outside of the machine. It has been designed to cool the inside of the copying machine by the developer of the Copying Machine.

On the other hand, as a form of copying, it is often the case that many copies are made continuously from one original, but during this continuous copying, the temperature near the light source is particularly likely to rise. 1. Because it is provided in contact with the bottom surface of the The flow of cooling air that should be introduced into the vicinity of the light source through the gap between the document table and the top surface of the copying machine is blocked by the cleaning tool, and as a result, the cooling performance in the vicinity of the light source is reduced, and the cooling air in the vicinity of the light source is blocked. There is a drawback that heat tends to accumulate in the document table, and when the continuous copying mode is adopted, the temperature near the light source on the document table tends to rise.

The present invention has been made in view of the above circumstances, and
By extremely rational means, it is possible to improve the cooling performance of the area near the light source while achieving good cleaning of the lower surface of the document table as in the past, thereby suppressing the temperature rise of the portion of the document table near the light source. The purpose is

[Means for solving problems]

In order to achieve the above object, the cleaning device for the lower surface of the document table according to the present invention has a cleaning tool that covers the entire width of the document table in a first state in contact with the lower surface of the document table and in a second state in which it is separated from the lower surface of the document table.
The present invention is characterized in that it is provided with a control mechanism that can switch the cleaning tool between the two states and switch the cleaning tool between the two states using a predetermined number of copies as a control standard.

[Effect]

Therefore, for example, while always placing the cleaning tool in the first state of cleaning, in the case of continuous copying, it is anticipated that heat will be trapped near the light source and the temperature of the document table near the light source will rise. By controlling the cleaning tool in the first state of cleaning to switch to the second state when continuous copying of a predetermined number of sheets or more is performed, the area near the light source during continuous copying of a large number of sheets can be controlled to switch to the second state. Suppression of temperature rise in the document table and cleaning of the lower surface of the document table are achieved.

Alternatively, for example, assuming that the dirt on the bottom surface of the document table is proportional to the total number of copies, the cleaning period at which the bottom surface of the document table will need to be cleaned can be determined based on the total number of copies (for example, 100).
The cleaning tool is used only while a predetermined number of copies (for example, an order of 50 copies) are made, using the total number of copies as the control standard for the cleaning cycle. By controlling to switch to the first state, during most of the period of the cleaning cycle, regardless of the copying form such as continuous copying of many sheets or copying one sheet at a time, or depending on the surrounding temperature environment. The area near the light source is cooled in a predetermined manner, and the lower surface of the document table is periodically cleaned.

That is, cooling the vicinity of the light source and cleaning the lower surface of the document table can be achieved by simple control of switching the cleaning tool between the two states based on a predetermined number of copies.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 2 shows a copying machine with a movable document table equipped with a document table cleaning device A. is frame 2
A document presser 3 pivotally mounted to the main body 4 of the copying machine is provided as a unit so as to be movable back and forth. , charging device 6, blank cut lamp 7, developing device 8,
Transfer device 9, copy paper separation device IO, cleaning device 1
) are arranged in that order in the rotational direction of the photoreceptor 5, and
A paper feed conveyance device 13 that conveys the copy paper a in the cassette case 12 to the transfer device 9; a paper discharge conveyance device 15 that conveys the copy paper a after transfer and separation to the fixing device 14; A pair of paper ejection rollers 17 that ejects the copy paper a onto the tray 16
This is provided.

A light source 18 that emits exposure light toward the document table 1 is provided at the upper part of the copying machine main body 4 on the downstream side in the paper feeding/discharging direction, and the reflected light from the document table 1 is directed to the document table 1. While arranging the first to fourth mirrors 19 to 22 and the zoom lens 23 that project light onto the photoconductor 5, the air near the light source 18 is exhausted to the outside of the machine, so that the original platen 1 and the copying machine main body 4 can be A cooling fan 25 is provided for introducing air from outside the machine for cooling from between the top surface (see FIG. 4) and from the vicinity of the manual paper feed section 24.

Incidentally, as shown in FIGS. 1 and 2, the copying machine main body 4
A rail member 26 that slidably supports the middle (direction perpendicular to the paper feeding direction) - side edge of the document table l is connected to the top plate portion 4a, and a rail member 26 that supports the document table holder. is a guide rail 2 that guides the slide member 27 attached to the bottom surface of the frame 2.
8 are provided on the upper surface plate portion 4a in parallel to the rail members 26, and the document table l is provided so as to be able to reciprocate along these rail members 26 and guide rails 28 in the direction of feeding paper. There is.

The document table cleaning device A is provided near the upstream side of the light source 18 in the paper feeding/discharging direction, and in detail,
As shown in the figure and FIGS. 3 and 4, a cleaning body 29 made of a brush is implanted in a cleaning body holding member 30 to constitute a cleaning tool 31 with a width of 1 J over the entire width of the document table 1. A solenoid 32 is provided on the copying machine main body side to switch the cleaning body 29 of the cleaning tool 31 into a first cleaning state X in which it comes into contact with the lower surface of the document table and a second state Y in which it separates from the lower surface of the document table; The cleaning tool 31 is in the two shapes Bx, y
A control mechanism 33 is provided for switching control.

Next, a specific example of the control mechanism 33 that uses the number of continuous copies of a predetermined number or more as a cleaning control standard will be explained based on FIG. 5. First, the number of continuous copies is set (step S), and , the print switch (not shown) is operated (step S
Z), if the set number of consecutive copies is less than a predetermined number (for example, 50), a No routine is taken, the set number of copies is made (step S+), and the setting is The copying operation ends (step S) when the number of copies has been completed.

During this time, the solenoid 32 is under demagnetization, and as shown in FIG. A cleaning tool 31 connected to the cleaning tool 31 is held in the first cleaning state fbiX.

On the other hand, if the number of consecutive copies is greater than or equal to the predetermined number, select YES.
A routine is taken to copy the predetermined number of sheets (step Ss), and when the number of copies reaches the predetermined number, the solenoid 32 is energized (step S&).
Here, the cleaning tool 31 is switched to the non-cleaning second state Y against the biasing force of the spring S (fourth state).
(see figure), the remaining number of copies exceeding the predetermined number of copies (step S?) is performed, and when the remaining number of copies are completed, the solenoid 32 is demagnetized (step S?).
s), the cleaning tool 31 is switched to the first state X again, and the copying operation is completed (step S4).

That is, the cleaning tool 31 is always placed under the first cleaning member Bx that is in contact with the lower surface of the original table, and the cleaning tool 31 is always placed under the first cleaning member Bx that is in contact with the lower surface of the document table, and the cleaning tool 31 is placed on the document table l near the light source.
During continuous copying of a predetermined number of sheets or more that leads to an increase in temperature, the cleaning tool 31 is switched to the second state Y during the continuous copying after completing the continuous copying of the predetermined number of sheets,
It is configured to prevent the portion of the document table l near the light source from increasing in temperature.

By changing a part of the above control system, as shown in FIG. 6, when the number of continuous copies is set to a predetermined number or more,
When continuous copying is started, the solenoid 32 is energized (step S) to put the cleaning tool 31 in the second state LiY, and when the continuous copying of the predetermined number of sheets is completed (step S1°), the solenoid 32 is demagnetized. (Step S+ +
), the cleaning tool 31 is switched to the first state
As shown in FIG. 7, when continuous copying of a predetermined number of sheets or more is started, the solenoid 32 is excited (step S+s), and the continuous copying of a predetermined number of sheets is completed (step S+a).
At this point, the solenoid 32 is demagnetized (step S1.
) and then terminate the copying operation (step Sa).

Alternatively, the cleaning tool 31 can be changed by the biasing force of the spring S with the configuration opposite to the state switching of the cleaning tool 31 shown in FIGS.
is configured to hold in the second state Y, and the eighth
As shown in the figure, when the continuous copying of a predetermined number of sheets is completed (step S+i), the solenoid 32 is energized (step 5).
17) The cleaning tool 31 is brought into the first state gX, and during the subsequent copying of a predetermined number of sheets, specifically, the total number of copies that will be required for cleaning (for example, 5
The cleaning tool 31 is held in the first state X until the copying of the predetermined number of sheets is completed (step S+a), and the solenoid 3 is
It may also be configured to demagnetize the magnetic disk 2 (step S1) and terminate the copying operation (step S4).

All of the state switching of the cleaning tool 31 in each control mechanism 33 having the above configuration is based on the control standard of the number of continuous copies being made or more than a predetermined number of copies, but as shown in FIG.
It is also possible to configure the cleaning tool 31 to be switched between the two states X and Y using the total number of copies of an order, such as 000 copies, as a control standard for state switching.

That is, as described above, the cleaning tool 31 is normally configured to be in the non-cleaning second state MY under demagnetization of the solenoid 32 by the biasing force of the spring S, and the lower surface of the document table must be cleaned. The wax cleaning period is assumed based on the total number of copies, and the total number of copies (for example, 2000 as mentioned above) is the estimated number of copies and the total number of copies that will be required for cleaning (for example, 50). When the total number of copies corresponding to the control timing is reached, the solenoid 32 is energized (step 5zo), and the cleaning tool 31 is switched to the first state X. At the same time, when the total number of copies required for the cleaning is completed (step Sr+), the solenoid 32 is demagnetized (step 5tt).

To summarize, for example, when 1,950 copies are made, the cleaning tool 31 is controlled to be in the first state BX to clean the lower surface of the document table while a total of 50 copies are made thereafter. .

In this configuration, since the cleaning tool 31 is in a non-cleaning, separated state during most of the cleaning cycle, the cleaning tool 31 is less prone to bending, and has high cooling performance, so it is not affected by the surrounding temperature environment. This has the advantage of allowing a cleaning method that does not cause any damage.

It goes without saying that the cleaning body 31 can be a sponge or a sponge covered with cloth.

゛Also, the above numbers for the number of copies are for convenience only.
This is not specific and can be set arbitrarily.

Further, even if the solenoid 32 is controlled to be in an energized state, it is naturally switched to a demagnetized state by opening the main switch, but is reset to the energized state by closing the main switch, The demagnetized state caused by opening the main switch described above is also regarded as an excitation state for control purposes, and therefore, the first state and second state of the cleaning tool referred to in the claims of the present invention are the above-mentioned states. It goes without saying that this is for control purposes and does not include the state when the main switch is open.

〔Effect of the invention〕

As described above, the device for cleaning the lower surface of the document table according to the present invention can freely switch the cleaning tool over the entire width of the document table between the first state in which it is in contact with the lower surface of the document table and the second state in which it is separated from the lower surface of the document table. The present invention is characterized in that it is further provided with a control mechanism that switches the cleaning tool to the dual-width position using a predetermined number of copies as a control standard.

As described in detail in the embodiment, in anticipation of the fact that when continuous copying is used, heat will be trapped near the light source and the temperature of the document table will rise, the cleaning tool is used to continuously copy a predetermined number of sheets or more. By using this as the control criterion for switching the state, it is possible to suppress the temperature rise near the light source when continuously copying a large number of sheets, and to clean the bottom surface of the document table, or to make sure that the dirt on the bottom surface of the document table is proportional to the total number of copies. However, based on the total number of copies, estimate the cleaning period at which the lower surface of the document table will need to be cleaned, and then calculate the predetermined total 1.
By using the number of copies as the control criterion for state switching by the control mechanism, the light source can be used at all times regardless of the copying format, such as continuous copying of many copies or copying one copy at a time, or regardless of the surrounding temperature environment. In addition to being able to cool the area around the document table in a predetermined manner, it is also possible to periodically clean the lower surface of the document table as the document table moves, that is, to control the number of copies to be made. :[
By simply controlling the cleaner to switch between the two states, it has become possible to cool the vicinity of the light source and clean the lower surface of the document table.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the upper part of the copying machine, with the document holder omitted;
Figure 2 is a schematic vertical cross-sectional view of the entire copying machine with a movable document table;
5 and 4 are detailed views showing the state switching of the cleaning tool, and FIGS. 5 to 9 are flowcharts of various control mechanisms. DESCRIPTION OF SYMBOLS 1... Original table, 31... Cleaning tool, 33... Control mechanism, X... First state, Y... Second state. Applicant Sanda Kogyo Co., Ltd. Agent Patent Attorney Hideo Oki Figure 3 X...1st state Y...2nd state Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (3)

[Claims] (1) A cleaning tool covering the entire width of the document table is provided so as to be switchable between a first state in which it is in contact with the bottom surface of the document table and a second state in which it is separated from the bottom surface of the document table, and the A device for cleaning the lower surface of a document table, characterized in that it is provided with a control mechanism for switching the cleaning tool between the two states. (2) The control criterion for state switching by the control mechanism is the number of continuous copies of a predetermined number or more, and based on the setting input of the number of continuous copies of the predetermined number or more, continuous copying of the number of copies exceeding the predetermined number is completed. The device for cleaning the lower surface of a document table according to claim 1, wherein a control mechanism is configured to switch the cleaning tool to the second state during the period of time. (3) The control criterion for state switching by the control mechanism is a predetermined total number of copies, and the cleaning tool is switched to the first state while a predetermined number of copies are made during the cleaning cycle using the total number of copies. The device for cleaning the lower surface of the document table according to claim 1, wherein the control mechanism is configured to cause the cleaning device to clean the lower surface of the document table.