JPH0466454A - Roll paper feeding unit - Google Patents

Abstract

PURPOSE:To make a stable copy without causing a paper jam at any time, by constituting such a roll paper sheet feeding unit as not to start a motion to feed roll paper sheets when an input numerical value to a cutting measurement input means is lower than a specific value. CONSTITUTION:A roll start key is switched on after he who is to copy inputs a roll paper sheet cutting measurement as a set value (x) by a ten key. At this time, when the set value (x) is less than 420 or more than 2000, an error indication is carried out by means of blinking the input value (x) on a roll paper sheet cut size display unit 71 and an operator is informed that there is a set input error. Then, at this time, a main motor in a roll paper sheet feeding unit is not switched on, and consequently, as no motion to feed a roll paper sheet 3 is started, paper jam is never caused.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides an image forming apparatus main body including an image forming section.
It is configured to cut and supply roll paper, and
The present invention relates to an image forming apparatus equipped with a cutting dimension input means for numerically inputting the cutting dimension of roll paper.

[Conventional technology]

In the image forming apparatus described above, in order to obtain the required cut paper (transfer paper), a predetermined cutting size is input by operating a numeric keypad on an operation section provided in the roll paper supply unit. Then, when this cutting dimension is set, the leading end of the roll paper provided in the roll paper supply unit is fed out, and the paper feed conveyance path between the roll paper supply unit and the image forming section in the main body of the image forming apparatus is set. When the rolled paper is conveyed to the conveying means provided therein and the leading edge of the roll paper is gripped by the conveying means, the force y1 means is operated to form a cut paper of a predetermined size, and then this cut paper is transferred to the conveying means. It is transported to the image forming section by a chisel.

In other words, in the image forming apparatus described above, even if there is no means for transporting the cut paper between the cut paper discharge port formed in the roll paper supply unit and the transport means in the image forming apparatus main body, the cant paper is It is designed to be supplied to the main body of the image forming apparatus.

[Problem to be solved by the invention]

However, if the cutting dimension input using the numeric keypad is smaller than a predetermined value, for example, the distance from the cut position of the roll paper in the roll paper supply unit to the conveyance means in the main body of the image forming apparatus, the cut paper will be cut as described above. cannot be conveyed into the main body of the image forming apparatus, and the cut paper may stop in the conveyance path and cause a paper jam, making it impossible to perform desired copying.

The present invention has been made with the above-mentioned considerations in mind, and its purpose is to prevent the above-mentioned inconvenience from occurring if the roll paper cutting dimension input through the operation unit is less than a predetermined value. An object of the present invention is to provide a useful image forming apparatus.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the image forming apparatus according to the present invention starts the operation of feeding the roll paper when the numerical value input to the cutting dimension input means is less than a predetermined value. It is unique in that it prevents this from happening.

[Function] In the present invention, when a roll paper cutting dimension smaller than a predetermined value is input, the operation of feeding the roll paper is not started, so a paper jam does not occur.

(Example] Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show the overall configuration of an electrostatographic copying machine as an example of an image forming apparatus incorporating a roll paper supply unit according to the present invention. The apparatus main body) 1 is mounted on the movable printer 2, and the roll paper supply unit 5, which discharges the roll paper 3 to the manual paper feed port 4 of the copying machine main body L, is attached to and detached from the copying machine main body I via the connecting member 6. Can be freely connected.

The copying machine main body 1 is constructed as follows.

That is, a reciprocating means 8 for reciprocating the document relative to the exposure device 7 is provided in the upper part of the device case IA, and the device case IA
A large paper feed cassette 9 is provided on the lower side of the paper feed cassette 9 so as to be freely drawn out to the raw paper supply unit 5 side.

Inside the device case IA, a photoreceptor 10 is provided so as to rotate in the direction of the arrow, and around the photoreceptor 10 are a main charging device 11, an exposure device 7, a developing device 12, a transfer device W13,
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 port 9 to the manual paper feed port 4, and
A paper feed conveyance path 18 is arranged from the transfer device 13 to the transfer device 13, and this paper feed conveyance path 18 carries the transfer paper from the manual paper feed port 4 direction or the feed section direction of the paper feed cassette 9 toward the transfer device 113. A pair of conveying rollers 19 is provided as a conveying means for conveying, 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.

In addition, 24 is a document supply path, 25 is a document end detection device,
26 is a document reversing device.

The movable deck 2 has wheels 27 at its lower part, and inside thereof, although not shown in detail, there is provided a transfer paper stock part 28 which is inclined higher toward the lower part, and a transfer paper stock part 28 is provided therebelow. A bending guide member 29 is removably provided.

The roll paper supply unit 5 is constructed as follows. That is, the wheels 32 are screwed onto the four lower corners of the bottom frame 30 via screw shafts 31, and vertical frames 33 are installed on both left and right sides of the bottom frames 1 and 30, and the r6I rear part of the vertical frames 33 A guide rail 34 extending downward ζ is provided to constitute a unit frame 35 that can be moved and adjusted freely.
Rollers 36 that roll along are provided at the upper and lower parts of the unit body 37, and gas springs 38 are installed between the bottom frame 30 and the unit body 37 as holding means for biasing and holding the unit body 37 so that it can be raised and lowered. It is provided on both the left and right sides, and a loading section 39 for the roll paper 3 is configured on the lower side of the unit main body 37.

As shown in FIG. 3, there is a roll 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 1. Paper feed roller pair 4 consisting of rollers 41 and 42 as paper feeding means
3, a feed switch 44 for detecting the presence or absence of the leading edge of the roll paper 3, a leading edge holding member 45 for holding the leading edge of the roll paper 3, and a movable member for cutting the roll paper 3 into a predetermined length at a predetermined timing. A cutting means 48 consisting of a blade 46 and a fixed blade 47, a pair of discharge rollers 49, and a discharge switch 5.
0 is provided. The cutting means 48 is configured such that when a solenoid (not shown) is turned on, the movable blade 46 rotates once to cut the roll paper 3.

Reference numeral 51 denotes a rotation amount detection device for detecting the number of rotations of the paper feed roller pair 43.
A shaft 5 connected to a shaft 53 to which one roller 41 of the
The rotation amount detecting device 51 consists of a pulse plate 55 fixed to the 4 and having appropriate slit holes (not shown), and an optical sensor 56 equipped with a light emitting element and a light receiving element provided so as to sandwich the pulse plate 55. from paper feed roller pair 4
A pulse signal is output along with the rotation of 3. 57 is a rotation detection device for detecting the rotation of the roll paper 3, which is attached to a shaft 61 fixed to a roller 60 that comes into contact with the peripheral surface of a brake plate 59 fixed to one end of a shaft 58 that holds the roll paper 3; It consists of a pulse plate 62 having a slit hole (not shown) and an optical sensor 63 equipped with a light emitting element and a light receiving element, which are provided so as to sandwich the pulse plate 62, and output a pulse signal only when the roll paper 3 rotates. It is configured to do so. Note that the one roller 41 is equipped with a gear (
It is connected to the driven side of a clutch (outside V) driven by a main motor (outside U?J) via a motor (not shown).

Furthermore, a paper discharge guide 4 is provided above the cutting means 48.
A cover 6 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 pair of paper feed rollers 4 are provided on this cover 65 so as to be able to open and close freely.
The other roller 42 of No. 3 is held, and the cover 65
A guide plate 66 that forms a paper discharge path by the paper discharge path, and a guide member 67 that guides the paper discharged through the paper discharge path toward the movable deck 2 are provided. Note that 68 is a plate-shaped guide member connected to the bending guide member 29 provided on the movable deck 2, and 69 is a grip bar horizontally installed above the front part of the unit main body 37.

An operating section 70 as shown in FIG. 4 is provided on the upper surface of the right vertical frame 33 of the roll paper supply unit 5 configured as described above. That is, in this figure, 71 is a roll paper cut size display section in which the cut size of the roll paper entered using the numeric keypad 72 is displayed, and 73 is a clear key. 74 is the memory input key-75
A cut size memory input section is provided with a plurality of pairs of display sections 76, 77 is a cutting key as an immediate cutting command input means, and 78 is a cut size memory input section for cutting the roll paper 3 in accordance with the movement of the document (not shown). This is a synchronized cut key for inputting a command to cut to a predetermined size. 79 is a cut number and jam display section that displays the number of sheets cut from the roll paper when continuous paper feeding is performed, and also displays a jam display when a paper jam occurs; 80 is the person's oyster; 81 Hao -
82 is a roll paper feed stop key.

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

Next, the paper feeding operation in the electrostatographic copying machine having the above configuration will be described with reference to flowchart 1 shown in FIG.

It is now assumed that the roll paper 3 in the roll paper supply unit 5 is in a paper feeding standby state with its leading end held by the leading end holding member 45.

First, the person (operator) who intends to make a copy inputs the roll paper cut dimension as the set value X using the numeric keypad 72 (step Sl), and then presses the roll paper start key 81.
is turned on (step S2).

It is determined whether the set value X is within a predetermined range (steps S3 and S4). That is, in this embodiment, it is determined whether the set value X is between 420 and 2000. More specifically, the roll paper 3 in the standby position is fed out so that its leading edge comes into contact with the pair of transport rollers 19 in the copying machine main body 1, and when it arrives, the skew is corrected and the copying machine main body 1 In order to synchronize the exposure timing to the photoreceptor 1o in the photoreceptor 1o, a predetermined loop is formed and the feed amount is set at 300 - 4, taking safety into account when the movement has to be made.
205m, and if a value less than this is set, paper cannot be fed.Also, if the size of the cut paper is long, heat will be taken away and thermal fixation will not be successful, so the set value In the same way, paper cannot be fed even if 2,000 pages are lost.

Therefore, when X is 420 or more and 2000 or less (YES in step S3 and step S4, respectively), the main motor (not shown) in the roll paper supply unit 5 is turned on (step S5), and this motor Rotates in a predetermined direction at a predetermined speed.

In this state, the clutch (not shown) of the pair of paper feed rollers 43 is turned on (step S6), whereby the pair of paper feed rollers 43 rotates in a predetermined direction, and the roll paper 3 is delivered to the discharge port 40.
is launched towards. Then, when the leading edge of the roll paper 3 contacts the discharge switch 50 and turns it on (YES in step S7), the rotation amount detection device 51 starts counting pulses, and the feeding amount of the leading edge of the roll paper 3 reaches 3005 m. When the corresponding number of pulses is counted (YES in step S8), the clutch is turned off (step S9). At this time, the leading end of the roll paper 3 is held between a pair of transport rollers 19 within the copying machine main body 1.

Then, the conveyance roller pair 19 rotates in a predetermined direction and pulls the leading end of the roll paper 3 (Y in step SIO).
ES), pulse counting by the rotation amount detection device 51 is started again, and the tip reaches the set value (for example, χ-300
-50) is sent (Y in step Sll)
ES), the clutch is turned on again (step 5).
12), the roll paper 3 is also fed by the roll paper supply unit 5. Note that among the set values, the numerical value 50 is the length required to form a loop when the roll paper 3 is cut. Here, when the number of pulses corresponding to the 50IIIllt is counted by the rotation amount detection device 51 (step 513), the clutch is turned off again (step 514), and the roll paper cant timing is reached 4 days before the capping means. A loop is formed to take .

Here, the cut solenoid is turned on for a predetermined period of time (step 515), the movable blade 46 of the canting means 48 makes one revolution, the roll paper 3 is cut, and a predetermined cut paper is formed, and then the cut solenoid is turned off. (Step S1
6).

Thereafter, when the trailing edge of the cut paper passes the ejection switch 50 and the ejection switch 50 is switched from on to off (step 517), the main motor is turned off (
In step 318), the cut paper is sent toward the image forming section 16 only by the pair of conveying rollers 19 in the copying machine main body 1, and subjected to a predetermined transfer, thereby performing a predetermined copy.

On the other hand, when the set value X is less than 420 or more than 2000, step S3. In step S4, N
o, and the input value X flashes on the roll paper cut size display section 71 to display an error message (step 319), thereby notifying the operator that there has been a setting input error. At this time, the main motor in the roll paper supply unit 5 is not turned on, and therefore, the operation of supplying the roll paper 3 is not started, so that no paper jam occurs. It goes without saying that when the above-described error message is displayed, all that is required is to input the set value X within a predetermined range after operating the clear key 73.

The present invention is not limited to the above-described embodiment, but can also be applied to the case where the cant size is input into the cant size memory input unit 74, for example, in the memory.

FIG. 6 shows an example of a flowchart in such a case. In this case, after inputting the memory value of the roll paper cut dimension as the set value X using the numeric keypad 72 (step 521), the memory input key 75 is turned on ( Step 522), the set value X is 420 as in the above embodiment.
and 2000 (step S).
23 and step 524), settings 4MX are 420 and 2
000 (YES in step S23), the set value X is written into the memory (step 525). If the setting fax is less than 420 or more than 2000, step S23.
If it is determined No in step S24, an error display is performed by flashing the input value X on the roll paper cut size display section 71 (step 526), and the operator is notified that there has been a setting input error.

In addition, when the above error message is displayed, press clear key 7.
It goes without saying that after operating 3, it is sufficient to input a set value X within a predetermined range.

In the embodiments shown in FIGS. 5 and 6 above, it is also determined whether the input setting value X exceeds 2000, but it is not necessary to do this. Set value X is a predetermined value on the lower limit side (for example, 420)
It is only necessary to determine whether or not the value is less than or not.

Further, instead of the above error display, a specific sound, melody, or message may be emitted, or a lamp provided on the operation unit 70 may be made to blink, and in either case, a warning is emitted. It's fine if you do it like this.

Furthermore, the present invention can be applied not only to the electrostatographic copying machine in the above embodiment, but also to image forming apparatuses such as printers.

(Effects of the Invention) As explained above, according to the present invention, when a roll paper cant dimension smaller than a predetermined value is input, the operation of feeding the roll paper is not started, so that a paper jam is not caused. Copying can always be performed stably.

[Brief explanation of the drawing]

1 to 5 show one embodiment of the present invention, FIG. 1 is a diagram showing the overall configuration of an electrostatic photocopier as an example of an image forming apparatus according to the present invention, and FIG. 2 is a perspective view thereof. 3 is a diagram showing the configuration of the main part of the roll paper supply unit, FIG. 4 is a diagram showing an example of the operation section, and FIG. 5 is a flowchart for explaining the paper feeding operation. FIG. 6 is a flowchart according to another embodiment of the present invention. 1...Image forming apparatus main body (electrostatographic copying machine main body), 3
... Roll paper, 5 ... Roll paper supply unit, 72
... Cutting dimension input means (numeric keypad). applicant

Claims (1)

[Claims] An image forming apparatus configured to cut and supply roll paper to an image forming apparatus main body including an image forming section, and equipped with a cutting dimension input means for numerically inputting the cutting dimension of the roll paper. A roll paper supply unit characterized in that the operation of supplying the roll paper is not started when the numerical value input to the cutting dimension input means is less than a predetermined value.