JPS61292659A - Unnecessary part erasing device for copying machine - Google Patents

Abstract

PURPOSE:To obtain a copy in which the unnecessary parts of an original are erased by utilizing a shielding sheet and shifting the sheet to an unnecessary copying part when copying a part of the original and controlling an erasing device corresponding to the quantity of moving and thereby erasing the latent image by an erasing device. CONSTITUTION:When a latent image part 30a passes, up to at least segments L1-Li are lit up, and when the latent image part passes successively segments Li-Li-3 are put out and segments Li-2-Li are lit up as before. Thus, by using shading sheets 3a, 3b to copy erasing excessive parts instead of copying the full face of an original 2, a partial copying can be made by eliminating the handling of inserting a sheet of white paper etc. Even in the case where shading sheets 3a, 3b are used to detect the size of the original and to select a copying paper, the selecting operation is not obstructed by this.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention defines an exposure area to be copied by moving a light-shielding sheet movably disposed on the lower surface of a platen, and blocks light for other areas of the platen. This invention relates to an unnecessary part erasing device in which the light shielding sheet is further used for erasing extra parts of a document and making copies, rather than for copying the entire surface of a document, in a copying machine in which light from an exposure device is blocked by a sheet.

[Background technology]

The light-shielding sheet on the underside of the platen is moved in accordance with the original placed on the platen, so that the light from the exposure lamp is irradiated only on the area that matches the size of the original placed on the platen. For parts other than the defined document area, use a light-shielding sheet to block the light from the exposure lamp.
A copying machine that reliably prevents leakage to the outside is known from Japanese Utility Model Application Publication No. 58-65057 and Japanese Patent Application Publication No. 58-85459.

By the way, even in a copying machine using such a light-shielding sheet, when making a copy, there are cases where it is desired to make a partial copy of only a part of the image instead of making a full copy. for example,
When copying an A4 original onto A4 copy paper, some parts of the original need to be copied, but other parts are unnecessary, and the copy is a copy with those extra parts erased. However, if you were to erase unnecessary parts like this by covering the parts of the manuscript with blank paper, the process would be extremely troublesome. I end up.

The operator must insert a blank sheet of paper between the document set on the platen and the platen surface so that the parts of the document that do not need to be copied are covered with blank paper.
If the above-mentioned light-shielding sheets were used to automatically select the copy paper, the operator would simply have to cover the unnecessary parts with blank paper. It's no longer enough to just do something like that.

That is, as disclosed in Utility Model Application Publication No. 58-6505, the light-shielding sheet is provided with a light-reflecting original presence/absence detection sensor at the leading end of the light-shielding sheet, which prevents its movement at the edges of the document. If the movement of the light-shielding sheet could be used to select the copy paper, it would be possible to automate what used to be a manual operation. When copy paper selection is automated by detecting the original size using a sheet, when making a partial copy as described above, use a sheet of paper large enough to go beyond the edge of the original to use as a blank sheet to erase unnecessary parts. When inserting this between the original and the platen surface using It will have to stop.

Originally, if the original was set, for example an A4 original, the light-shielding sheet would have to be moved at the edge of person 4's original in order to automatically select the A4 copy paper that matched the person 4's original. Since there is a blank sheet of paper as described above, the light-shielding sheet stops at the edge of the blank sheet, and the copy sheet is selected based on this. Therefore, in this case, although it is possible to erase unnecessary parts of the original, the selected paper will be different from the target paper. To avoid this situation, when covering the part of the document that the operator wants to erase with blank paper, the operator must use blank paper that is large enough to cover the part that needs to be erased, but large enough that it does not extend beyond the edges of the document. Because it is necessary to create a blank sheet of paper and insert such a blank sheet between the original and the platen surface, it is necessary to create such a blank sheet each time and erase unnecessary parts of the original. The operator is required to perform extremely complicated work.

[Problem of invention]

This invention provides a copying machine equipped with a light-shielding sheet, in which when it is desired to obtain a copy with unnecessary parts of the document erased, the above-mentioned extremely troublesome or, in some cases, troublesome automatic selection of copy paper can be avoided. The idea is to make it possible to erase unnecessary parts without having to cover the parts you want to erase.

[Means and operations for achieving the object] For this reason, the present invention utilizes a light-shielding sheet, and when making a partial copy of a document, moves it to a portion that does not need to be copied, and also adjusts the amount of movement at this time. The erase device is controlled according to the amount of movement, and the erase device erases the latent image in the area corresponding to the original part hidden by the light-shielding sheet, thereby removing the unnecessary part of the original as a copy. This is so that what is erased can be obtained.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Figures 1 to 4 show a document size detection device for a copying machine according to a previous proposal by the present applicant. The following case will be described in which a detection means is provided in connection with a pulse motor that is a driving source for sheet movement.

In Figure 1, (1) is the platen;
A document (2) is placed thereon, with one corner thereof serving as a positioning reference point R, as shown in FIG. (3a), (3
b) respectively on the lower surface of the platen (1).
+ A pair of light-shielding sheets (4a) and (4b) made of, for example, a flexible non-transparent film, which are arranged so as to be movable in the longitudinal and transverse directions; (4a) and (4b) are each light-shielding sheet (3a);
, (3b), the guide bar provided at the end of (5a), (5
(b) is a document presence detection sensor attached to each guide bar (4a), (4b), and each light-shielding sheet) (3a)
, (3b) are supported by the guide bars (4a), (4b) being slidably mounted on a guide rail (not shown), and a document presence/absence detection sensor (5a),
Regarding (5b), as in the above-mentioned Utility Model Application Publication No. 58-65057, a light-emitting element that emits light toward the platen (1) surface and a light-receiving element that receives reflected light from the irradiation surface are used. It is a reflective sensor.

(6a) and (6b) are the above-mentioned light shielding sheets (3a) and (3).
b) A pair of drive sources, such as a pulse motor, (8a
), (8b) are drive pulleys attached to each drive shaft (7a), (7b), (9a), (9b) are each guide bar (
4a), (4b), while an appropriate number of driven pulleys (1oa), (xob) are connected to the springs (11a), (11) for maintaining tension.
b) Connect the other end to each of the drive pulleys (8a), (
These are wires fixed to each light shielding sheet (3).
It constitutes a driving means for moving the sheets a) and (3b) forward and backward, and when defining an exposure area according to the document size with the light-shielding sheets (3a) and (3b) as described later,
The pulse motors (6a), (6b) are controlled based on the detection signals from the document presence/absence sensors r5a), (sb), so that the respective document presence/absence detection sensors (5a), (
5b) is adapted to stop the movement of each of the light-shielding sheets ('3a) and r3b) at the time when the edges of the document (2) placed on the platen (1) are detected in the orthogonal directions. There is.

In this example, a rotary encoder ('121L) is mounted on each drive shaft (7a), (7b) as a means for detecting the document size by detecting the amount of movement of each light shielding sheet (3a), (3b). (12b) is provided, and each output thereof is given to a control section as described later and used for document size detection.

In addition, as shown in Figures 2 and 3, each light shielding sheet (
3a) and (3b), home sensors (13a) and (13b) are provided to detect their reference positions So. Detection of the amount of movement of each of the light-shielding sheets (3a) and (3b) described above is based on the detection of the exposure area according to the document (2) set on the platen (1) by each of the light-shielding sheets (3a) and (3b). When the light shielding sheets (3a) and (3b) are moved to define a
a) and (3b) are the reference positions S. The operation starts when the home sensors (13a) and (13b) detect that the vehicle is moving away from the home. That is, in the timing chart shown in FIG. 4, (a) shows the output of the document presence/absence sensors (5a), (5b), (b) shows the operation timing of the pulse motors (6a), (6b), Figure (e)
represent the outputs of the home sensors (13a), (13b), but the detection operation using the outputs of the rotary encoders (121L), (12b) for detecting the document size described above is performed by the pulse motors (6a), ( Each home sensor (17a) after 6b) starts driving according to the drive start signal G
, (d) from the time when the detection output of (17b) is obtained.
The document detection sensor (5) is started as shown in .
Steps a) and (5b) are performed until the edge of the document (2) is detected and the pulse motors (6a) and (6b) are stopped by the drive stop signal T. Therefore, Xo%yo
'e The distance from the positioning reference point R of the platen (1) to each home sensor (i3a), (13b),
4(d) in the longitudinal direction of the platen (1).
If the amount of movement of the light-shielding sheet (3a) is calculated from the output of the rotary encoder (Z2a), and similarly, Yl is the amount of movement of the light-shielding sheet (3b), then
The longitudinal and lateral dimensions x, y of the platen (1)
is calculated using the following formula.

X = Xo + Xt”...llY
= Yo + Yt −-f2) In this way, the movement of each light-shielding sheet (3a) and (3b) is utilized to detect the original size and use this for automatic copy paper selection control. Furthermore, in addition to this, the above light-shielding sheets (3a) and (3b) are also used when copying the selected copy paper by erasing unnecessary parts of the original (not a full-page copy of the original (2)). In order to be able to do this, after detecting the document size based on the above X and Y, light shielding sheets (3a) and (3
b) Move it from that position and move it forward so that the area of the document you want to erase is hidden, that is, move it back toward the positioning reference point R. At the same time, detect the amount of movement at this time and move it around the photosensitive material. Feedback is sent to the erase device installed, so that the electrostatic latent image formed on the photosensitive material during the copying operation of the original (2) and the exposure is developed by the developing device. , when passing through the above erase device 1.
The latent image in the area corresponding to the unnecessary portion of the document (2) is erased. For example, as shown in FIG. 5, in a copying machine having the document size detection device described in FIGS. 1 to 4, light-shielding sheets (3a), (3b),
In addition to the document presence/absence detection sensor (5a), (5b), etc., the drive shaft (3a), (3b) of each light shielding sheet (3a), (3b) serves as an operation unit that can manually move the light shielding sheet (3a), (3b). 7
Handles (x+a), r14b) for manually rotating ``a), (7b)'' are provided, and each of the above-mentioned pulse motors (6a), (6b) is provided for manual rotation.
Manual changeover switch α51t to unlock the
- When making a partial copy, the operator operates these, and as described above, the pulse motors (6a) and (6b) are used to set the original (2) to the next position according to its size. fcM optical sheet (3a), (3
b) can be manually moved to the area of the document (2) that is desired to be erased.

In addition, regarding the structure of each of the above-mentioned handles (Z4a) and (14b) used to return the light-shielding sheets (3a) and (3b) that have been placed at the edge of the document (2) to detect the document size, , as shown in FIG.
is installed and operated by the operator, the bevel gear (1
7a), (17b) and (tea), (18b), the drive shafts (7a), (7b) may be rotated via the drive shafts (7a), (7b), and the above-mentioned changeover switch Q5] It is also possible to incorporate this function. That is, a spring is interposed between the knobs I'16a), (16b) and the panel, and the knobs (16a), (16b) and bevel gears (i7a), (17b) are normally urged upward in the figure. The operator then presses the knobs (16a), (16b) and bevel gears (x7a), (1) against the force of the spring.
When pressing down 7b), the only bevel gears (17a) and (1
7b) and the bevel gears (18a) and (tab) are connected, and in connection with this push-down operation, the changeover switch α
9 is activated and the Nockles motors (6a) and (6b
), and in this state the operator turns the knob (16).
If you turn a) and (16b), the rotation will be the drive shaft (7a)
, (7b).

In this way, an operation part that can manually move each of the light-shielding sheets (3a) and (3b) is provided, and in this example, the drive shaft (7a),
Rotary encoder (12a) attached to (7b),
(12b) is used for detection. For example, the seventh
As shown in the figure, if the part (2a) of the manuscript (2) is an unnecessary part, as shown in Figure 8, once the part (2a) of the manuscript (2) is
Light shielding sheets (3a), (3b) up to the position according to the size of the
] has moved, the operator switches to manual mode using the changeover switch 09, moves the light-shielding sheet (3a) in the direction of the arrow with the handle (14a), and brings the light-shielding sheet (3a) forward to the position shown by the broken line. At this time, the amount of movement is detected by a rotary encoder (iza), and the amount corresponding to the amount of movement is fed back to the erase device placed facing the photosensitive material, and the copying operation is performed on the photosensitive material based on this information. The erasing device is controlled to be turned on and off in order to erase the latent image in the area corresponding to the unnecessary portion (2a).

Figure 9 is a control block diagram when the above-mentioned control is performed using a microcomputer. The original size detection switch +17) is operated by the operator to define the exposure area and automatically detect the original size.
and the above-described document presence/absence detection sensor (5a), (5b)
, the rotary encoders (12a), (12b), the home sensors (t3a), (13b), and the change-over switch output are given to the control unit a, especially as data, via an input interface. (201 is a tray selection unit for selecting the tray to be used according to the detected document size, eη is an erase device, (a) is an exposure device and other equipment necessary for copying, and the above-mentioned pulse motor (6)
a) and (6b) are controlled by the control section a through the output interface (to).

As shown in FIGS. 10 and 11, the erase device η includes a charge corotron (C), a developing unit (C), a guide for guiding copy paper (C), a transfer section, and a cleaning device (C). C) etc. are arranged to face the surface of the sensitive material (E) at a position in front of the developing device (A) with respect to the surrounding sensitive material (E), and this is in the direction of movement of the sensitive material. It is composed of a large number of light emitting segments L and %LN arranged along a direction perpendicular to . As shown in FIG. 11, these segments L+ to LN are latent image portions (3 oa ), the light is turned on when that portion passes through the erase device Q, and its turning on and off is controlled by the control section (191) so that only the remaining latent image portion (30a) is developed.

That is, the control unit aω controls the central processing unit (cpU) 01
).

Random access memory (RAM) e3J,
Read-only memory ('ROM) (consisting of 33, this ROM (3→, each light-shielding seam as shown in the flowchart in FIG. 12) (3a), (3b)
A program is stored in advance that uses the movement of the original to detect the size of the original document, and also uses an erase device to erase the latent image of the unnecessary portion of the original when it is desired to obtain a copy with unnecessary portions erased. The CPU +'3η executes this program based on the data given through the input interface a81'i, and outputs the pulse motors (6a), (6b),
It sends control signals to the tray selection unit (2), erase device (incorporated), etc. to control them.

As for the exposure device, in this example, a full-surface exposure type is used as shown in FIG. 10. In the case of full-surface exposure, there is an advantage that the amount of exposure can be increased, and even in such a case, the part of the platen (1) other than the original is covered with the light-shielding sheets (3a) and (3b). Therefore, strong light for exposure can be prevented from leaking to the outside.

Next, the operation of the above-mentioned component device will be explained.

As shown in step ■ in FIG. 12, the operator first turns on the document size detection switch (10) to start normal rotation of each pulse motor (6a) and (6b).This causes each light-shielding sheet to (3a) and (3b) are wound around the respective drive shafts (7a) and (7b), and movement begins.
Home sensor (13a), (t
3b) is the reference position S of each light shielding sea) ('3a) and (3b). When the separation from the rotary encoders (12a) and (12b) is detected and the output becomes high level as shown in FIG. That is, since each rotary encoder (12a11'12b) is provided on the drive shaft (7a), (7b), a pulse output is generated simultaneously with the movement of the light shielding sheets (3a), (3b), but the above-mentioned (1) ) and the values X1 and YI in formula (2) are calculated based on the values of each rotary encoder (12a), (i2b) after each light-shielding sheet (3aλ (3b) is separated from the reference position So)
cpuol) is the number of output pulses of each rotary encoder (12a) from the detection point onward based on the detection output of each home sensor (13a), (13b).
, (12b) will be counted.

Next, in step 0, each document presence/absence detection sensor (5a)
, (5b), each light shielding sheet (3a), (3
The edge of document (b) is placed on the platen (1).
) is reached. The arrival at the edge of the original (2) is detected when the reflected light is no longer received by each original presence/absence detection sensor (5a), (5b) and the original (2) is present, as shown in Figure 4 (al). If a YES judgment result is obtained in the above judgment step ◎, the process proceeds to step 0 and each pulse motor (6a )
, (6b) to stop the normal rotation drive. Therefore, each light-shielding sheet (3a), (3b) is
) stops at positions corresponding to the longitudinal and lateral edges of the platen (1). When making a full-page copy of the original (2), an area of the platen (1) corresponding to the original (2) is thereby defined as an exposure area.

Next, as shown in steps (2) and [F], the amount of movement of each of the light-shielding sheets (3a) and (3b) is detected, and the size of the original (2) is detected. That is, the pulse motor (6
When a) and (6b) stop, there is no longer any pulse signal input from the rotary encoder as shown in Figure 4 (dl).
The value of is calculated, and the manuscript (
2) Find the sizes X and Y. In this way, manuscript (2)
Once the size is determined, the next step is to select the tray to be used based on the detected size, assuming the same size.
Alternatively, it is possible to perform automatic magnification setting based on the tray to be used, that is, specifying the paper size. In the case shown in the figure, the tray selection section (company) performs tray selection in the next step G. That's what I do.

In this way, the size of the original (2) is determined by using the movement of each light-shielding sheet (3a) and (ab), and based on this, the copy paper that matches the original (2) is automatically selected. After the tray is selected, the copying operation is started in response to the operation of the copy switch α″?, but before this, it is first determined whether the changeover switch Q51 is turned on or not. After this determination, the process proceeds to the next step. That is, after step G, it is determined in step 0 whether or not the changeover switch opening 9 is turned on.

If the determination result of this determination step is No, it means that the operator wishes to make a full copy rather than a partial copy, so in this case, the next step
As shown in ■, the operator presses the copy switch (171).
When turned on, the entire document (2) is copied onto the copy paper selected in step ◎.

If you want to make a copy with unnecessary parts erased from the original (2) instead of a full-page copy, the operator can press the selector switch (1).
51 is operated, so in this case steps Q to ◎ are executed. For example, when copying a portion of the original (as shown in Fig. 7) is in danger, the operator detects the edge of the original (2) as described above and removes the light-shielding sheets (3a) and (3b) set to -H. Use the handle (x4a) f to move it forward as shown in Figure 8, move it to the area you want to erase, and make sure that the unnecessary part (2a) of the original (2) is hidden by the light-shielding sheet (3a). The amount of movement is determined using the rotary encoder (1
2a). In this way, once the number of counts returned by the rotary encoder (12a) is detected, the area in which the latent image should be erased is calculated, and based on this, the area to be erased is erased during the copying operation. Turning on and off of the device Qη is controlled.

That is, when the copy switch (1η) is turned on and the copying operation is started in step (2), in the case of the above-mentioned full-scale copying, the latent image portion (1) shown in FIG.
), the latent image passes through the erase device Qη and is developed without being erased, whereas in the case of partial copying, when the light-shielding sheet (3&) is returned as described above, the latent image is erased in conjunction with this. The erase device 01) is controlled when the latent image portion (30a) corresponding to the unstable portion (2a) of the document (2) in the latent image portion (to) passes through the erase device Qη. ? When υ controls the lighting, the latent image in that part is erased.On the other hand, when the remaining latent image part 30a) passes, the erase device ep is controlled to turn off, and this latent image part Only (30a) is visualized by the next imager (c) and transferred to the copy paper selected in step ◎. Therefore, in the case of this partial copy, a copy of the original (2) with the unnecessary part (2a) erased is output.

The above explanation is for the case where a partial copy is made by returning the light shielding sheet (3a) (3a) e of light shielding sheets (3a) and (3b), but the same applies when returning the light shielding sheet (3b) and making a partial copy. It is done by control. For example, if you want to erase the latent image in the area to the right of the dashed-dotted line in FIG. 1) If you light up the light emitting segments Li-2 to Li when passing through,
It is possible to erase the latent image on the right side of the dashed line, and it is also possible to perform partial copying by combining these latent images. In other words, when the latent image portion (30a) passes, at least the segments L1 to Li are turned on, and when the latent image portion (30a) subsequently passes, the segments L1 to Li-3 are turned off. Segment Li-2~
Li remains lit.

In this way, according to the apparatus of the above embodiment, the light-shielding sheets (3 &) and (3b) are used to copy the original (2) by erasing the excess portion of the original (2) instead of making a full-length copy, thereby inserting a blank sheet. You can make partial copies without having to go through the trouble of doing so. When the operator wants to obtain a copy with unnecessary parts of the original (2) erased, the operator only needs to use the manually operable handles (14a), (14b), etc. to move the copy to the area to be erased, and the operation is simple. Moreover, even if the light-shielding sheets (3a) and (3b) are used to detect the original size and select copy paper, the selection operation will not be hindered in any way. In other words, with the method of covering the paper with blank paper as described above, there is a risk that the edge of the blank paper may be mistakenly detected as the edge of the original, resulting in an error in the selection of copy paper. On the other hand, with the above configuration, this does not occur.

In the above embodiment, the case of whole surface exposure was explained, but the present invention can also be applied to the case of slit exposure as shown in FIG. The latent image portion (30a) between the n latent image portions formed in
) is erased according to the amount of movement of the light-shielding sheet similar to the above embodiment? This may be done by controlling η.

Furthermore, when erasing unnecessary parts on a copy, the movement of the light-shielding sheets is detected using rotary encoders (12a) and (12b), but this is not limited to this configuration. A large number of slits or reflective marks may be provided on the edge along the moving direction, and these may be detected by a transmissive or reflective photosensor, or the driven pulley (10a) shown in FIG. 10b)
The amount of movement may be detected by attaching a disk to the disk and providing a slit or a reflective mark on the periphery of the disk.

Furthermore, when moving the light-shielding sheet to the area to be erased, the operator manually moves the light-shielding sheet using the handle (14a).
(14b) etc., it is not always necessary to provide a movement mechanism to operate the button (14b). It is also possible to provide a switch that stops the light-shielding sheet when it is turned off, and to use this switch to move the light-shielding sheet to a desired position when making a partial copy.

〔Effect of the invention〕

As described above, according to the present invention, unnecessary parts that do not need to be copied can be erased using a light-shielding sheet, so the operator does not have to do the troublesome work of covering the parts he wants to erase with blank paper each time. Moreover, even if the document size is detected by using the movement of the light-shielding sheet and the copy paper is automatically selected, it is possible to make partial copies without impairing this function. It has effects such as being able to.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an automatic document size detection device applied to an embodiment of the present invention, FIG. 2 is a schematic sectional view along the longitudinal direction of the platen of the device, FIG. 3 is a plan view, and FIG. 4 5 is a timing chart for explaining the operation, FIG. 5 is a schematic diagram showing an example of a mechanism for manually moving the light-shielding sheet TF, and FIG. 6 is a configuration diagram showing another example of a manual operation section in place of the manual handle in FIG. 5. , FIG. 7 is an explanatory diagram showing an example of a document containing unnecessary parts to be copied, FIG. 8 is an explanatory diagram showing an example of moving the light-shielding sheet to the area to be erased, and FIG. 9 is a block diagram showing an example of the control system. 10 is a schematic diagram showing an example of a copying mechanism in the case of full-surface exposure, FIG. 11 is an explanatory diagram for explaining unnecessary portion erasing, and FIG. 12 is a flow chart 1 showing an example of control operation. 13A and 13B are schematic diagrams showing a copying mechanism in the case of slit exposure. [Explanation of symbols] (1)...Platen (2)...
・Document (3a) (3b)... Light shielding sheet (12
aX12b)...Rotary encoder (14
aχ14b)...Handle (151...
...Choice switch (16ax16b) ...Knob (17aX17b), (18a) (18b) - Bevel gear patent applicant Fuji Xerox Co., Ltd. agent
Tomohiro Nakamura, Patent Attorney (2 others) 1; Flatten 3rd Cause Figure 4 (d) ~...Ko-Dara ---Dara [Fig. 7
Figure 8

Claims (1)

[Claims] In a copying machine in which a light-shielding sheet defines an area corresponding to a document to be copied on a platen, a means for moving the light-shielding sheet to a portion not required to be copied when making a partial copy of the document, and the moving means. means for detecting the amount of movement of the light shielding sheet moved by;
An unnecessary portion erasing device for a copying machine, comprising means for controlling an erasing device to erase a latent image in accordance with the output from the detecting means.