JP3483233B2 - Paper transport device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a sheet conveying device, and more particularly, to a sheet conveying device for appropriately and inexpensively detecting skew of a sheet. 2. Description of the Related Art In a paper transport apparatus such as a facsimile apparatus, a scanner apparatus, a copying apparatus, and a printer apparatus, it has been conventionally required to detect the transport of an original or a recording sheet and control the reading timing and the recording timing. The skew (oblique conveyance) of a document or recording paper is rarely detected, and such skew is detected by a document reading method which has been filed by the present applicant. There is an apparatus disclosed in an embodiment (JP-A-6-209).
No. 389). This document reading apparatus uses a special contact sensor that reads a region outside the image reading region by a predetermined width to a predetermined width, and uses a predetermined region outside the image reading region of the contact sensor as a skew detection region. When the document is skewed outside the image reading area during document reading and the skew detection area of the contact sensor is turned on, it is detected that skew has occurred. However, in such a conventional document reading apparatus, a special wide contact sensor is used, and a skew detection area outside the image reading area of the contact sensor is used. By turning it on, the skew was detected, so a special contact sensor was required, which not only increased the cost, but also detected only the skew at the contact sensor, leaving room for improvement. Was. [0005] The present invention is intended to detect the occurrence of skew, further omitting the optical sensor of the displacement detecting means, the number of components is reduced, the more expensive, and,
It is intended properly and Turkey detecting the occurrence of skew. According to the present invention, there is provided a sheet conveying apparatus for conveying sheets of a plurality of sizes of sheets along a sheet conveying path ; paper detecting means provided corresponding to the perpendicular direction of the paper size position; includes a paper detection actuator is moved a predetermined amount by the paper to be the conveying, and an optical sensor for detecting the movement of the actuator, the direction of the conveyor In the above
Paper leading and trailing edge detecting means disposed downstream of the paper detecting means ; effective in a direction perpendicular to the transport direction of the paper transport path
Movement and positional deviation detecting actuator is moved a predetermined amount by the paper, the movement of the positional deviation detection actuator the paper detection actuator <br/> the paper detection actuator is transmitted to the motor to move therethrough is disposed outside the region positional shift detection means and a transmission member for; and, control means for performing various operations based on a detection result of said sheet detecting means and the paper leading and back ends detecting means; comprises a. Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. It should be noted that the embodiments described below are preferred embodiments of the present invention, and therefore, various technically preferred limitations are added. However, the scope of the present invention is not limited to the following description. The embodiments are not limited to these embodiments unless otherwise specified. FIG . 1 shows an embodiment of a paper conveying apparatus according to the present invention.
A state, Ru side sectional view der of the facsimile apparatus 1. In FIG. 1, the facsimile apparatus 1 has an operation unit 3 provided on the front side (left side in FIG. 1) of the main body case 2 so as to be openable and closable on the main body case 2 via a shaft 3a.
A document placing table 4 is formed on the rear side (right side in FIG. 1). Although not shown, the operation unit 3 includes various operation keys such as a numeric keypad and a start key, and also includes a display (for example, a liquid crystal display). Various commands such as a transmission operation are input from the operation keys. In addition, the contents of commands input from the operation keys and various information notified from the facsimile machine 1 to the operator are displayed. An original transport path 5 is formed between the original mounting table 4 and the main body case 2 and a lower portion of the operation unit 3. The original transport path 5 includes an original separating roller 6 and an original separating pad 7. , Document presence / absence actuator (hereinafter referred to as S1 actuator) 8, document presence / absence sensor (hereinafter referred to as S1 sensor) 9, main transport roller 10, document leading / back end detection actuator (hereinafter referred to as S2 actuator) 1
1, a document leading and trailing edge detection sensor (hereinafter, referred to as an S2 sensor) 12, a document reading unit 13, a transport roller 14, and the like. A plurality of originals are set on the original mounting table 4 as shown by arrows in FIG. 1, and the S1 actuator 8 is rotated by the original set on the original mounting table 4,
The rotation of the S1 actuator 8 is detected by the S1 sensor 9 to detect that a document is set on the document table 4. When the S1 sensor 9 detects that a document has been set on the document placing table 4, the document separating roller 6 rotates to separate the documents one by one together with the document separating pad 7 and to move the document along the document transport path 5 in the main transport path. It is sent out to the roller 10 direction. When a document is conveyed to the main conveyance roller 10, the leading end of the document pushes the S2 actuator 11 to rotate, and the rotation of the S2 actuator 11 is detected by the S2 sensor 12.
To detect that the document has been conveyed. When the original is transported to the main transport roller 10, the main transport roller 10 transports the original to the original reading unit 13, and the original transported to the original reading unit 13 is transported by the transport roller 14 to the original reading unit 13. The document is read while being pressed against the document, and the document reading unit 13 reads the image of the document. The document whose image has been read by the document reading unit 13 is discharged out of the main body case 2 by the transport rollers 14. The operating section 3 is attached to the main body case 2 so as to be openable and closable about the shaft 3a as described above.
When the operation unit 3 is opened, the document conveying path 5 is opened. A roll-shaped recording paper 15 is accommodated in a central portion in the main body case 2, and the roll-shaped recording paper 15 is conveyed between a thermal head 17 and a platen roller 18 via a decurling unit 16. Thus, an image is recorded by the thermal head 17 while being conveyed to the platen roller 18. The roll-shaped recording paper 15 on which the image is recorded is cut into an image information size by the shuttle cutter 19 and is discharged out of the main body case 2. The S1 sensor 9 and the S2 sensor 12 are
As shown in FIG. 2, a transmission type photo interrupter is used, and the S1 actuator 8 and the S2 actuator 11 each have a light shielding portion which is connected to the light projecting side element of the S1 sensor 9 and the S2 sensor 12, respectively. By entering between the side elements, the light between the light projecting side element and the light receiving side element of the S1 sensor 9 and the S2 sensor 12 is blocked, and the original is detected. These S1 sensor 9 and S2 sensor 12
Is the effective reading width (conveyance area) of the document as shown in FIG.
L, and is located at the same position in the document conveying path 5 as the S1 sensor 9 in the document width direction.
A B4 size width detection sensor (hereinafter, referred to as an S3 sensor) 20 for detecting a document having a size width is provided. The S3 sensor 20 includes the S1 sensor 9 and the S2 sensor 1
2, a B4 size width detection actuator (hereinafter, referred to as S3 actuator) 21 is rotated by a B4 size document to transmit / block light. A document of B4 size width is detected. FIG . 3 shows a connection with the S2 actuator 11.
FIG.
2 shows an enlarged view around the document conveying path 5. The skew detection actuators 41 and 42 are fixed to shafts 41a and 42a rotatably disposed at a position coaxial with the shaft 11a to which the S2 actuator 11 is attached.
The interlocking pawls 41b and 42b provided at the ends of the shaft 41a and the shaft 42a on the shaft 11a side engage with the interlocking pawls 11b and 11c provided at both ends of the shaft 11a. Thus, they operate in conjunction. The skew detection actuator 41 and the skew detection actuator 42 are arranged on the skew allowable lines La and Lb outside the effective reading width L of the document conveying path 5 shown in FIG. The above S1 sensor 9, S2 sensor 12, S3
The sensor 20 and the skew detection sensor 22 output detection results to a control unit (not shown) of the facsimile apparatus 1, and the control unit outputs these sensors 9, 12, 20, and 22.
Based on the detection result, while controlling the rotation of the document separation roller 6, the main transport roller 10, and the transport roller 14,
The reading operation of the document reading unit 13 is controlled. Next, the operation of the present embodiment will be described. The facsimile apparatus 1 is characterized in that the skew of a document conveyed through the document conveyance path 5 is appropriately detected and the conveyance of the document is stopped. That is, in the facsimile apparatus 1, when a plurality of originals are set on the original placing table 4, the original set on the original placing table 4 rotates the S1 actuator 8, and the S1 actuator 8 rotates. When the light shielding unit blocks the light path of the S1 sensor, the S1 sensor 9 detects that the document is set on the document table 4. S
When the sensor 9 detects that a document has been set on the document placing table 4, the document separating roller 6 rotates, and the document separating roller 6 separates the documents together with the document separating pad 7 one by one. The path 5 is sent out toward the main transport roller 10. When a document is conveyed to the main conveyance roller 10, the leading end of the document pushes the S2 actuator 11 to rotate, and the rotation of the S2 actuator 11 is detected by the S2 sensor 12.
To detect that the document has been conveyed. When the original is transported to the main transport roller 10, the main transport roller 10 transports the original to the original reading section 13, and the original transported to the original reading section 13 is transported by the transport roller 14 to the original reading section 13. The document is read while being pressed against the document, and the document reading unit 13 reads the image of the document. The document whose image has been read by the document reading unit 13 is discharged out of the main body case 2 by the transport rollers 14. When the document is a B4 size document, the S1 sensor 9 is turned on, the S3 actuator 21 is rotated, and the S3 sensor 20 is turned on to detect that the document is B4 size. When detecting that the document is B4 size, the document reading unit 13 reads the document with a reading width corresponding to the B4 document. And a document smaller in size than B4,
For example, when a skew occurs while an A4-size original is being conveyed by the original separation roller 6, the main conveyance roller 10, and the conveyance roller 14, the A3-size original is rotated by the S3 actuator 21 and the S3 sensor 20 is turned on. Turns on. When the S3 sensor 20 is turned on while the A4 size document is being conveyed, the control unit of the facsimile apparatus 1 determines that skew has occurred, and determines that the document separation roller 6 and the main conveyance roller 1
0 and the rotation of the transport roller 14 are stopped, and the transport of the document is stopped. Moreover, the document is skewed, the document comes into contact with the at least one of the skew sensing actuator 41 and the skew detection actuator 42 shown in FIG. 3, at least one of the skew sensing actuator 41 and the skew detection actuator 42, When rotated in the direction indicated by the arrow in FIG.
The rotation of the skew detection actuator 42 and the shaft 4
When the interlocking pawls 41b and 42b rotate, the interlocking pawls 41b and 42b are transmitted to the interlocking pawls 41b and 42b via the interlocking pawls 41b and 42b.
The rotation of b and 42b is transmitted to the interlocking claws 11b and 11c, and the shaft 11a on which the S2 actuator 11 is mounted further rotates. When the shaft 11a further rotates, the S2 actuator 11 further rotates in the direction indicated by the arrow in FIG. 3 from the position where the optical path of the S2 sensor 12 shown in FIG. 5 is blocked, and as shown in FIG.
The S2 sensor 12 is turned on when it is out of the position where the optical path of the sensor 12 is blocked. The control unit of the facsimile machine 40
The sensor 1 is turned on and the S2 sensor 12 is turned off to measure whether or not the skew of the document has occurred. If it is determined that the skew has occurred, the document separating roller 6, the main transport Roller 10 and transport roller 14
Is stopped, and the conveyance of the document is stopped. When the conveyance of the document is stopped, the document is stopped in a state of being skewed on the document conveyance path 5, and the stopped document is appropriately removed by opening the operation unit 3 about the shaft 3a. Can be. Therefore, the S2 sensor 12 can be used for both the detection of the leading edge and the trailing edge of the document and the detection of the skew without providing a dedicated sensor for detecting the skew of the document, thereby reducing the cost. In addition, it is possible to solve a problem that a document is read by the document reading unit 13 in a skewed state, an appropriate image cannot be read, and image data of the skewed document is transmitted to a destination. it can. As a result, it is possible to appropriately read the original and transmit appropriate image data. Also, the skewed document is further transported,
The document can be prevented from being damaged or broken, and the document can be removed in an appropriate state and read again appropriately. Although the invention made by the inventor has been specifically described based on the preferred embodiments, the invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the invention. It goes without saying that it is possible. For example, in each of the above-described embodiments, a case where the present invention is applied to a facsimile machine has been described.
The present invention can be similarly applied to a printer device and the like. According to the paper conveying apparatus of the present invention, the paper
Paper leading and trailing edge detecting means downstream of the paper detecting means for size detection
The stage, for being moved by a predetermined amount by the paper being conveyed normally
It includes a paper detection actuator and an optical sensor that detects the movement of the actuator ,
Therefore, it is located outside the effective area in the direction perpendicular to the transport direction.
By moving the position displacement detection actuators location, a transfer member, so to transmit the movement of the positional deviation detecting actuator to the paper detection actuator, by omitting the optical sensor of the displacement detection means, to reduce the number of parts In addition, the occurrence of skew can be detected more appropriately at a lower cost, and the conveyance of the skewed sheet can be stopped to prevent the sheet from being damaged or broken.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side cross-sectional view of a facsimile apparatus to which an embodiment of a paper transport device according to the present invention is applied. FIG. 2 is a top view of a document conveying path portion of the facsimile apparatus shown in FIG. FIG. 3 is a perspective view of a document leading and trailing edge detecting actuator and a skew detecting actuator shown in FIG . 2 ; FIG. 4 is a diagram showing a paper transport unit of the facsimile apparatus shown in FIG .
Enlarged cross-sectional view. FIG. 5 is a diagram showing a paper transport unit of the facsimile apparatus shown in FIG .
FIG. 4 is an enlarged cross-sectional view illustrating a paper passing state . FIG. 6 illustrates a paper transport unit of the facsimile machine shown in FIG .
FIG. 4 is an enlarged cross-sectional view illustrating a state when there is a sheet passing skew . DESCRIPTION OF THE SYMBOLS 1, 30, 40 Facsimile machine 2 Main body case 3 Operation unit 3a shaft 4 Document loading table 5 Document transport path 6 Document separation roller 7 Document separation pad 8 Document presence actuator (S1 actuator) 9 Document presence sensor (S1 10) Main transport roller 11 Original leading and trailing edge detection actuator (S2 actuator) 12 Original leading and trailing edge detection sensor (S2 sensor) 13 Original reading unit 14 Transport roller 15 Rolled recording paper 16 Decal unit 17 Thermal head 18 Platen roller 19 Shuttle cutter 20B4 size width detection sensor (S3 sensor) 21B4 size width detection actuator (S3 actuator) 41, 42 Skew detection actuators 11a, 41a, 42a, shafts 11b, 11c, 41b, 42b Interlocking claws La, Lb allowable line

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H 7/08 B65H 7/14 G03G 15/00 107 G03G 15/00 518 H04N 1/00 108

Claims (1)

(57) Patent Claims 1. A means for conveying a sheet of paper a plurality of sizes along the sheet conveying path; use of a direction perpendicular to the conveying direction of the sheet of the sheet conveying path <br /> paper detecting means provided at a position corresponding to the sheet size; includes a sheet detection a <br/> actuator which is moved by a predetermined amount by the paper to be the conveying, and an optical sensor for detecting the movement of the actuator, The paper detecting means in the direction of the conveyance
A sheet leading and trailing edge detecting means disposed downstream of the sheet ; an effective area perpendicular to the conveying direction of the sheet conveying path ;
Including the position deviation detection actuator is moved a predetermined amount by the paper moving therethrough placed outside, by transmitting the movement of the positional deviation detecting actuator to the paper detection actuator and a transmission member for moving the the paper detection actuator A sheet transport apparatus comprising : a position shift detecting unit ; and a control unit that performs various operations based on detection results of the sheet detecting unit and the sheet leading and trailing end detecting units.