JPH04106048A - Paper feeding device for diazo duplicator - Google Patents

Abstract

PURPOSE:To prevent breakage of a document due to a jam by temporarily stopping a conveyance mechanism by means of a conveyance control means during detection of the occurrence of lateral displacement of the document by a given amount by means of a detecting means. CONSTITUTION:Light shield members 25b and 26b of lateral displacement detecting means 25 and 26 are extended in a manner to cross each other at a given angle with a conveyance direction on both sides of a conveyance passage 12. When a document D is protruded outwardly from the conveyance passage, the light shield members are brought into contact with the document D for retraction. During retraction of the light shield members 25b and 26b, limit sensors 25a and 26a are shielded and it is detected that the document D is protruded outwardly from the conveyance passage by a given amount. This detecting information is inputted to a control part 100 containing a CPU, an ROM, an RAM, a switching source, and an inverter. The control part 100 executes processing according to a given program stored in the ROM, and during detection of the occurrence of lateral displacement of the document D by a given amount in the conveyance passage 12 from ON/OFF of the limit sensors 25a and 26a, stops first - third conveyance roller pairs 13, 16, and 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device for a diazo copying machine that superimposes a document and photosensitive paper and feeds the superposed paper to an exposure section.

[Conventional technology]

Traditionally, transparent original images (
Diazo copying machines are known that overlap and expose (original documents) and develop them to form a copied image.
In this diazo copying machine, it is necessary to accurately overlap the original and recording paper when inserting the original to be copied, so the paper feeding device that feeds the original and recording paper has no misalignment or skew of the paper. Stable conveyance performance is required.

On the other hand, as a technique related to paper feeding of a copying machine for preventing the misalignment and tilting of recording paper, there is one described, for example, in Japanese Patent Application Laid-Open No. 185654/1983. In this copying machine, the top paper (hereinafter simply referred to as a sheet) separated from the stack of recording paper in the lower layer is
After the sheet is stopped, a sensor detects the leading edge of the sheet when it reaches a predetermined position, and the conveyance status (for example, sheet deflection) is detected from changes in linear speed, and the conveyance timing is determined. I'm trying to control it.

Furthermore, in Japanese Patent Application Laid-Open No. 1-98543, an actuator having a sheet contact surface inclined with respect to the conveying direction (longitudinal direction) is provided, and lateral displacement of the sheet is detected by detecting the movement of this actuator with a sensor. things are listed.

[Problem to be solved by the invention]

However, in such conventional technology, the linear speed and the amount of lateral deviation of the sheet are detected at the detection part by the sensor, and the conveyance control is performed under uniform conditions regardless of the size of the sheet. Even if the amount of lateral slip is the same,
When the sheet size is large or the document is long, as the paper is conveyed, it gradually protrudes left and right from the normal conveyance path, which tends to cause paper jams.

This causes a serious problem of document damage in the paper feed device of the diazo copying machine, and a solution to this problem has been desired.

[Purpose of the invention]

Therefore, when the left and right sides of a document protrude from the conveyance path, the present invention predicts the influence of the protrusion,
The purpose of this is to temporarily stop the transport mechanism when necessary to prevent document damage and paper jams.

[Means for Solving the Problems] In order to achieve the above object, the present invention feeds a predetermined recording paper to the conveyance path in response to the insertion of a document into the entrance of the conveyance path, and In the paper feed device of a diazo copying machine, which overlaps paper and original and transports it to the exposure section by a transport mechanism,
lateral displacement detection means provided on both sides of the conveyance path in the path width direction to detect lateral displacement of the document protruding from the normal conveyance path; and lateral displacement detection means for detecting lateral displacement of the document within the conveyance path based on the detection information of the lateral displacement detection means. The present invention is characterized by comprising a conveyance control means that detects the lateral shift and temporarily stops the conveyance mechanism when the lateral shift reaches a predetermined value.

Hereinafter, the present invention will be explained based on examples.

1 to 6 are diagrams showing one embodiment of the present invention.

First, the configuration will be explained.

In FIG. 1, reference numeral 11 denotes a document table on which a document is placed and guided, 12 a conveyance path into which the document from the document table 11 is inserted, and 13 a driven roller 13a provided near the entrance 12a of the conveyance path 12. and a drive roller 13b, 14 is a stopper that can be retracted into the transport path, and 15 is a position just before the stopper 14 (for example, 0 to 3III + upstream f from the stopper 14). This is a document insertion sensor that detects document jamming.
A document inserted into the entrance of the document insertion device 20 is detected by a document insertion sensor 15, and the stopper 14 is released (retracted) by an actuator (not shown, for example, a solenoid) when the sensor 15 outputs a detection signal. When the stopper 14 is released, the driven roller 13a and the driving roller 13b of the conveying roller pair 13 come into contact and start conveying the document, and this document is further transferred to the second and third conveying roller pairs 16, 17 on the downstream side. (transport mechanism) transports it to an exposure section 31, which will be described later. The second conveying roller pair 16 is composed of a driven roller 16a and a driving roller 16b that are in constant contact with each other, and grips and conveys the document from the conveying roller pair 13 to bring it into contact with a stopper 18 that is retractable into the conveying path 12. Third
The conveying roller pair 17 consists of a detachable driven roller 17a and a driving roller 17b, and the driven roller 17a is pivotally supported by a support member 19 integral with the stopper 18.
8 is separated from the drive roller 17b in the extended state. The strainer 18 blocks the tip of the document tray at a predetermined position to position the document tray, and when the driven roller 17a and the driving roller 17b come into contact, it is released (retracted) and conveys the document tray to the exposure section 31 side. enable.

Reference numeral 21 denotes, for example, a paper feed cassette of a tray raising/corner claw separation type, and the paper feed cassette 21 stores photosensitive paper P (recording paper) stacked in a bundle. This photosensitive paper P
The uppermost sheet of paper is in contact with the paper feed roller 22, and when the document insertion sensor 15 detects the document insertion sensor 15, the uppermost sheet is sent out to the conveyance path 23 by the roller 22. Further, the conveyance path 23 merges with the conveyance path 12 just before the conveyance roller pair 17, and the document sheet from the conveyance roller pair 13 and the photosensitive paper P from the paper feed cassette 21 are overlapped upstream of the exposure section 31. . That is, when − sheets of original paper are inserted into the entrance of the conveyance path 12, one sheet of photosensitive paper P is correspondingly fed from the paper feed cassette 21 to this conveyance path 12, and this photosensitive paper P and After the original document is blocked by the stopper 18 and superimposed, it is transferred to the exposure section 31 by a pair of transport rollers 17.
transported to.

The exposure section 31 includes a cylinder glass 33 holding a plurality of lamps 32A, 32B, and 32C, a drive roller 34, a tension roller 35, and idle rollers 36A, 36B arranged around the cylinder glass 33, and each roller 34. .35.Belt 3 passed between 36A and 36B
7 and a roller 38 that is in contact with the cylinder glass 33 on the downstream side of the third transport roller pair 17. While being sandwiched between the photosensitive paper P and the belt 37, the photosensitive paper P is exposed to exposure light from a plurality of lamps 32A, 32B, and 32C, and a latent image corresponding to the original image of the manuscript is formed on the photosensitive paper P.

After the latent image has been formed, the polymerized sheet is sent from the exposing section 31 to a separating section 41 where it is separated into original paper and photosensitive paper P. This separating section 41 is biased against the cylinder glass 33. A big-off plate 42 guides the exposed polymeric sheet to a predetermined position at the exposed tip, and an original adsorption device uses negative pressure to suction the document guided by the big-off plate 42 from the outside (back side of the original screen). It consists of a unit 43 and a photosensitive paper suction unit 44 that sucks the photosensitive paper P guided and conveyed by the big-off plate 42 from the back side using negative pressure.

Here, the document suction unit 43 includes a suction duct section 51 that is connected to a vacuum fan (not shown) and sucks the document through a suction hole (details not shown) using negative pressure, and a drive shaft supported by the suction duct section 51. a roller 52 and a driven roller 53;
The belt 54 is wound around both rollers 52 and 53 and conveys the document along the suction duct section 51. The photosensitive paper suction unit 44 also includes a suction duct portion 61 that is connected to a vacuum fan (not shown) and sucks the original through a suction hole (not shown in detail) using negative pressure, and a feed roller 62 that rolls into contact with the belt 54. are doing. Then, the document sheet separated from the photosensitive paper P in the separation section 41 is discharged to the outside of the machine by a paper discharge roller 71 that rolls into contact with the belt 54, while the photosensitive paper P is transferred to a conveyance roller 72 that is close to the suction duct section 61. , a pair of transport rollers 73 and a pair of return rollers 74 send the image to the next developing section 81 .

The developing section 81 includes a developing tray 82 containing a predetermined developer containing an azo coupling component, and three rollers 83a and 8 disposed in contact with each other such that at least one roller is immersed in the developer.
3b and 83c, and when the photosensitive paper P passes between this developing roller set 83,
The latent image is visualized by a small amount of developer applied. Then, the photosensitive paper P on which this developed image (copied image) is recorded is discharged onto a copy tray 86 by a pair of paper discharge rollers 85 .

Note that FIGS. 2 and 3 show the drive systems on both the left and right sides of the document conveyance path 12, FIG. 2 shows the drive system on the left side, and FIG. 3 shows the drive system on the right side.

In FIG. 2, 90 is a motor, 91 is a pulley, 92 is a timing belt, and 93 is a gear. In addition, in Fig. 3, 94 is an idler, 95 is a pulley, 96.97
98 is a timing belt, 98 is a pulley, and 99 is a gear.

On the other hand, as shown in FIG. 4.5, the upstream side of the conveyance path 12 (
That is, lateral shift detection means 25 and 26 are provided on both sides of the document conveyance path in the path width direction. These lateral shift detection means 25 and 26 each have limit sensors 25a and 26a each consisting of a light emitting element and a light receiving element, and light shielding members 25b and 26b that come into and out of the conveyance path 12 in contact with and away from the document, These light shielding members 25b and 26b are
It extends so as to intersect at a predetermined angle with respect to the conveying direction on both sides of the document tray, and when the document tray protrudes outside (laterally shifts) from the regular conveyance path, it comes into contact with the document tray and retracts. When the light shielding members 25b and 26b are retracted, the limit sensors 25a and 26a are shielded from light, and it is detected that the original document has protruded from the normal conveyance path by a predetermined amount.

Detection information from the lateral shift detection means 25 and 26 is provided to a control unit 100 including a CPU, ROM, RAM, switching power supply, inverter, etc. (not shown).

The control unit 100 executes a process to be described later according to a predetermined program stored in the ROM, and controls the limit sensor 2.
5a and 26a, it is determined whether a predetermined amount of lateral deviation has occurred in the document in the conveyance path 12,
It functions as a conveyance control means that temporarily stops the first to third conveyance roller pairs 13, 16, and 17 when this predetermined lateral deviation occurs. Note that the predetermined amount of lateral deviation here refers to the maximum allowable amount of deviation from the reference position at the detection site of the lateral deviation detection means 25 and 26, which can be determined depending on the size of the photosensitive paper P or each document size. , a range in which the original paper or its overlapping sheet hardly protrudes from the transport path 12 even after continuous transport when the original size is large or the original is long, and there is no risk of paper jams or damage to the original paper. This is the deviation. Furthermore, it is preferable to install the lateral deviation detection means 25, 26 in a range where the conveyance distance is short so that when the predetermined lateral deviation is detected and the transport mechanism is stopped, the document can be easily reset.

Next, the effect will be explained.

FIGS. 6(a) to 6(d) are flowcharts of programs executed by the CPU of the control unit 100.

In FIG. 6(a), first, initial setting is performed in step SLl, and selection switching of a loop corresponding to a switching command, which will be described later, is performed in step S12. Further, when the copying machine is stopped, when the door is open, when a call for a service person is required, etc., a loop appropriate to the situation is selected from a plurality of other loops (not shown).

In the normal loop shown in FIG. 6(b), step S
A boat input is performed at step 21, a boat output is performed at step S22, and various subroutines for overall control including transport control at step S23 are executed.

Further, step S24 is a jam monitoring routine, in which it is constantly checked whether the document sheet and photosensitive paper P are being conveyed normally, and when an abnormality in conveyance is detected, that is, when a jam has occurred, the sixth The process moves to the process shown in FIG. Incidentally, in step 325, the copy mode is checked.

In FIG. 6(c), boat input/output is performed in steps 331 and S32, and after a display means (not shown) displays that a jam has occurred in step S33, a jam clearing process is performed in step 334. A mode check is then performed in step 335.

The jam monitoring routine in step S24 is shown in FIG. 6(d).
As shown in , in step S41, the limit right sensor 25
It is determined whether the left limit sensor 26a is ON or not, and in step S42 it is determined whether the left limit sensor 26a is ON. If the result of these determinations is No, in step S43 the jam monitoring routine group of each transport mechanism section monitors jams in each transport mechanism. On the other hand, if the determination result in either step S41 or S42 is YES, a switching command is issued in step 312 of the main loop to switch from the normal loop to the jam processing loop in step S44, and furthermore, the transport roller for transporting the document Outputs a command signal to temporarily stop other drive systems such as 13, 16, and 17 until the jam is cleared.

As described above, in this embodiment, the control unit 100 checks whether or not the document sheet has shifted laterally by a predetermined amount in the conveyance path based on the detection information of the lateral shift detecting means 25 and 26, When this occurs, that is, when a jam is likely to occur, the motor 90 is stopped and the entire transport mechanism is temporarily stopped. Therefore, when the original size is large or the original is long, the transport of the original is stopped before a large lateral shift of the original due to skew occurs, preventing an actual jam from occurring, and damage is prevented.

〔effect〕

According to the present invention, a predetermined amount of lateral deviation of the document in the transport path is detected based on the detection information of the lateral deviation detection means, and when this predetermined amount of lateral deviation occurs, the transport mechanism is temporarily stopped by the transport control means. When the original size is large or the original is long, transport of the original can be stopped before a jam occurs due to the influence of skew, and damage to the original due to the jam can be prevented.

[Brief explanation of drawings]

1 to 6 are diagrams showing an embodiment of the paper feeding device of a diazo copying machine according to the present invention. FIG. 1 is an overall configuration diagram of the copying machine, and FIGS. A schematic configuration diagram, FIG. 4 is a perspective view of the lateral deviation detection means, FIG. 5 is a plan view of the document transport path near the lateral deviation detection means, and FIG. 6 is a flowchart of the control program including the transport control process. . 11... Document table, 12... Conveyance path, 12a... Conveyance path entrance, 13.16.17... Conveyance roller pair (conveyance mechanism), 15... Original insertion sensor, 18... Stopper, 21... Paper feed cassette, 25.26... Lateral shift detection means, 25a, 26
a...Limit sensor, 25b, 26b...
... Light shielding member, 31 ... Exposure section, 41 ... Separation section, 100 ... Control section (transport control means), D ...
...Original, P...Sensitive paper (recording paper)

Claims (1)

[Claims] A feeder for a diazo copying machine that feeds a predetermined recording paper into the transport path in response to an original being inserted into the entrance of the transport path, overlaps the recording paper and the original, and transports the paper to the exposure section by the transport mechanism. In the paper device, a lateral deviation detection means is provided on both sides of the conveyance path in the path width direction, and detects a lateral deviation in which the document protrudes outside the normal conveyance path; A paper feeding device for a diazo copying machine, comprising: a conveyance control means for detecting lateral displacement of the document and temporarily stopping the conveyance mechanism when the lateral displacement reaches a predetermined value.