JPH03269449A - Image forming device - Google Patents

Abstract

PURPOSE:To securely insert a document irrelevantly to whether a document tail end detection unit is used or not by switching the document tail end detection unit between a 1st position where a document which is guided by document guides can be detected and a 2nd position where the insertion of the document is not impeded. CONSTITUTION:The document guides 24 each consist of a guide main body 55 and a width matching side plate 56 and can freely move to or away from both right and left sides of a document setting part 57 (figures show only the right side). The document tail end detection unit 25 can be switched between the 1st position where the document 61 can be detected and the 2nd position where the insertion of the document 61 is not impeded by moving a slide plate 60 to A or B as shown by an arrow. The document tail end detection unit 25 when not used is moved away to the 2nd position and the document is inserted. The document tail end detection unit when used is set at the 1st position to securely detect the tail end of the document 61.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a document trailing edge detection unit that detects the trailing edge of a document supplied to a document exposure section provided on the top surface of an image forming apparatus main body. The present invention relates to an image forming apparatus that is integrally provided with a document guide for guiding a document to an exposure section.

[Prior Art] Transfer paper used in image forming apparatuses, such as copy paper, is produced by storing standard-sized cant paper in a paper feed center and taking it out one sheet at a time, or by forming it in the main body of the image forming apparatus. It is common practice to manually insert cant paper one sheet at a time from the transfer paper insertion slot provided in the paper feed slot, but when using the paper feed cassette, the larger the size of the transfer paper, the larger the installation space for the paper feed cassette. There is a problem with this.

Therefore, when large-sized transfer paper is required, a roll of transfer paper of a predetermined width is wound into a cylindrical shape and installed in the main body of the image forming apparatus, or a roll of paper (loaded into the R feeding unit) is used. It has been proposed to unwind the roll paper and supply the cut paper to a transfer paper insertion slot of an image forming apparatus.

Then, it is necessary to cut the roll paper into a predetermined length according to the size of the document to be supplied to the document exposure unit provided on the top surface of the image forming apparatus main body, but if the document size is known in advance, The document size is input on the operation/display section provided on the main body of the image forming apparatus, and if the document size is unknown, a detection signal is sent from the document edge detection switch provided on the way to the document exposure section. This is done based on the detection signal from the document trailing edge detection unit. In this case, from the viewpoint of operability, the document trailing edge detection unit is integrally provided with a document guide for guiding the document to the document exposure section.

[Problem to be solved by the invention]

However, in the image forming apparatus configured as described above, in the case of a copy operation that does not require detecting the size of the original, for example, when feeding cut paper instead of roll paper, or even when feeding roll paper, the original size is In cases where this information is known and can be inputted into the image forming apparatus in advance, the document trailing edge detection unit is integrally provided with the document guide, which becomes a hindrance to document insertion.

The present invention has been made with the above-mentioned considerations in mind, and an object of the present invention is to provide an image display system that can reliably insert a document both when the document trailing edge detection unit is used and when the document trailing edge detection unit is not in use. An object of the present invention is to provide a body shaping device.

[Means to solve the problem]

In order to achieve the above-mentioned object, the am-forming device according to the present invention has a document trailing edge detection unit in a first position where the document guided by the document guide can be detected and a second position that does not prevent insertion of the document. The feature is that the position can be switched to either of the following.

[Effect]

According to the present invention, when the document trailing edge detection unit is not used, it can be retracted to a position where it does not interfere with the insertion of the document, so that the document can be inserted smoothly. When the document trailing edge detection unit is used, the trailing edge of the inserted document can be reliably detected by setting it in a predetermined detectable state.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall configuration of an electrophotographic copying machine as an example of an image forming apparatus according to the present invention, in which a copying machine main body (image forming apparatus main body) l is mounted on a movable deck 2, and a roll paper 3 is copied. A roll paper supply unit 5 for discharging to a manual paper feed port 4 of the machine body 1 is detachably connected to the copying machine body 1 via a connecting member 6.

The copying machine main body 1 is constructed as follows.

That is, a reciprocating means 8 for reciprocating the document relative to the document exposure section 7 is provided in the upper part of the device case l^, and the device case l^
A large paper feed cassette 9 is provided on the lower side of the roll paper supply unit 5 so as to be freely drawn out. S@ is a document leading edge detection switch provided on the way to the document exposure section 7.

A photoreceptor lO is provided inside the device case l^ so as to rotate in the direction of the arrow, and a main charging device 11. Original exposure section 7, developing device 12, transfer device 13
, a separating device 14, and a cleaning device 15 are provided in this order, and an image forming section 16 is formed by these members.

Further, a paper passing guide 17 is provided extending from the supply section of the paper feed cassette 9 to the manual paper feed port 4, and the manual paper feed port 4
A paper feed conveyance path 18 is arranged from the transfer device 13 to the transfer device 13, and the transfer paper from the direction of the manual paper feed port 4 or the direction of the supply section of the paper feed cassette 8 is transferred to the transfer bag N.
A pair of conveying rollers 19 is provided as a conveying means for conveying in 13 directions, and a pair of registration rollers 20 is provided between this pair of conveying rollers 19 and the transfer device 13.
Reference numeral 21 denotes a fixing device that fixes the transfer paper after separation and fixing.
2 is formed, and a pair of paper discharge rollers 23 is provided downstream thereof.

Further, 24 is a document guide for guiding the document to the document exposure section 7, 25 is a document trailing edge detection unit, and 26 is a document reversing device.

The movable deck 2 has wheels 27 at its lower part, and a transfer paper stock part 28 is provided inside thereof in a state of being tilted higher toward the front side, and a bending guide member 29 is attached and detached below the paper stock part 28. It is set in.

The roll paper supply unit 5 is arranged as follows. That is, the wheels 32 are screwed onto the four corners of the bottom side of the bottom frame 30 via screw shafts 31, and the vertical frames 33 are installed on both the left and right sides of the bottom frame 30, and the vertical frames 33 are provided at the front and rear of the vertical frames 33. A unit frame 35 is provided with a guide member 34 extending in the direction, and is movable and level adjustable.
On the other hand, rollers 36 that are transferred along the guide member 34 are provided at the upper and lower parts of the unit main body 37, and further,
Gas springs 38 as holding means for biasing and holding the unit body 37 so that it can be raised and lowered are provided on both left and right sides across the bottom frame 30 and the unit body 37, and a loading section for the roll paper 3 is provided at the lower side of the unit 37. 39 is formed.

A pair of paper feed rollers 41 as roll paper supply means are disposed in the middle of the paper path extending from the paper feed section at the top of the roll paper loading section 39 to the paper discharge port 40 to the manual paper feed port 4 of the copying machine main body l. , a feed switch 42 for detecting the presence or absence of the leading edge of the roll paper 3, a leading edge holding member 43 for holding the leading edge of the roll paper 3, and a cutting means for cutting the roll paper 3 to a predetermined length at a predetermined timing. 44 and a pair of discharge rollers 45
and an ejection switch 46 are provided. And 4
A rotation amount detection device 7 detects the number of rotations of the pair of paper feed rollers 41, and is configured to output a pulse signal in accordance with the rotation of the pair of paper feed rollers 41. Also, 48 is the roll paper 3
The rotation detection device detects the rotation of the roll paper 3, and is configured to output a pulse signal only when the roll paper 3 rotates.

Furthermore, a paper ejection guide 49 is provided above the cutting means 44.
A cover 5 is provided diagonally and also serves as a paper ejection guide surface on the front side of the unit in correspondence with the roll paper loading section 39.
A guide plate 51 that forms a paper ejection path with the cover 50 and a guide member 52 that guides cut sheets ejected through the paper ejection path toward the movable deck 2 are provided. . Note that 53 is a plate-shaped guide member connected to the bending guide member 29 provided on the movable deck 2, and 54 is a grip bar horizontally installed above the front part of the unit main body 37.

Next, an example of the structure of the document guide 24 and the document trailing edge detection unit 25 and the attachment of the document trailing edge detection unit 25 to the document guide 24 will be explained with reference to FIGS. 3 and 4. .

The document guide 24 consists of a guide main body 55 and a width-adjusting side plate 56, and is provided on both the left and right sides (only the right side is shown in FIG. 3) of a document placement section 57 formed on the front surface of the copying machine main body l.
For example, they are provided so as to be movable toward or away from each other using a mechanism such as a rack and pinion. Reference numeral 58 is a plate that is attached to the document guide 20 by fixing it, for example, with screws at the lower part of the guide body 55.
The main body 59 is mounted so as to be movable integrally with the main body 59 at an appropriate angle.

The document trailing edge detection unit 25 is made of, for example, a reflective sensor, and has a sliding plate 6 bent along the attachment @58.
It is held at 0. That is, the document trailing edge detection unit 25 moves the rear side of the main body 59 to which the sliding plate 60 is attached in the direction of arrow A or B in FIG. The position can be switched to either the second position (retracted position outside the first position) that does not interfere with the insertion of the original 61, and the detection mechanism 25A of the original trailing edge detection unit 25 and the mounting are mounted on the main body 59.
A document passage section 6 through which a document 61 passes between the front side of the
2 is attached so that it forms.

The plate spring 63 is mounted on the sliding plate 6o so as to protrude from the sliding surface so as to be able to move forward and backward.
Two positioning grooves 64 are formed to correspond to the position and the second position, so that the sliding plate 6° can be temporarily fixed at each position, and the trailing edge detection unit 25 of the document This is to prevent it from easily moving left and right in the two positions. Further, for installation, a retaining portion 65 is provided on the plate 58 in a protruding manner, and a tongue piece 66 is formed on the sliding plate 60, so that even if the sliding plate 60 is moved in the direction of arrow B, it will not slide. The plate 60 is attached so as not to separate from the plate 58.

Note that each part of the electrostatographic copying machine is controlled by a control device not shown.

In the electrophotographic copying machine having the above configuration, when the document trailing edge detection unit 25-t is not used, the document guide 2
4 is moved and positioned to match the width of the document 61.

At this time, the mounting plate 58 also moves together with the document guide 24. In this state, when the sliding plate 60 is pulled out a predetermined distance in the direction of arrow B in FIG. engages and the sliding Fi 60 is fixed at that position, causing the document trailing edge detection unit 25 to
The document can be retracted to the second position where it does not interfere with the insertion of the document 1, and therefore the document can be inserted smoothly.

In addition, when using the document trailing edge detection unit, the sliding plate 6
0 by a predetermined distance in the direction of arrow A in FIG. 25 can be set at the first position where the document can be detected, and the trailing edge of the document 61 can be reliably detected.

Note that when the document trailing edge detection unit 25 detects the trailing edge of the document 61, it is not necessary to enable the document trailing edge detection unit 25 to detect the document 61 before the document 61 is inserted. The document 25 may be detected until it finishes passing.

Further, in the above-described embodiment, the position is changed by sliding the document uk edge detection unit 25 in the left-right direction, but the document trailing edge detection unit 25 can be rotated, for example, by 90 degrees to change the position of the document 61 to a detectable state. It may be possible to switch to a state in which insertion of the original 61 is not obstructed.

〔Effect of the invention〕

As explained above, in the present invention, the document trailing edge detection unit, which is provided integrally with the document guide, is placed between the first position where the document guided by the document guide can be detected and the second position which does not interfere with the insertion of the document. Since the position can be switched between the two positions, when the document trailing edge detection unit is not used, the document can be inserted smoothly without being obstructed by the document trailing edge detection unit. When using the trailing edge detection unit, by setting it to a predetermined detectable state, it is possible to reliably detect the trailing edge of the document, improving the operability of the trailing edge detection unit, and improving the operability of the trailing edge detection unit. The image forming device has become easier to use.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a diagram showing the overall configuration of an electrostatographic copying machine as an example of an image forming apparatus according to the present invention, and FIG. 2 is a perspective view thereof. FIG. 3 is a perspective view showing an example of the mounting structure of the document trailing edge detection unit and the document guide, and FIG. 4 is a sectional view thereof. l... Copying machine main body (image forming apparatus main body), 7... Original exposure section, 24... Original guide, 25... Original trailing edge detection unit, 61... Original. Applicant: Sanda Kogyo Co., Ltd. Agent: Patent attorney: Hideo Fujimoto 24...A manuscript guide 25...Document trailing edge detection unit 61...Manuscript

Claims (1)

[Claims] An image forming apparatus in which a document trailing edge detection unit for detecting the trailing edge of a document supplied to a document exposure section provided in the main body of the image forming apparatus is integrally provided with a document guide for guiding the document to the document exposure section. The apparatus is characterized in that the document trailing edge detection unit can be switched between a first position where the document guided by the document guide can be detected and a second position which does not prevent insertion of the document. image forming apparatus.