JPH067612Y2 - Document reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a document reading device such as a facsimile device having a thick document reading unit and a sheet document reading unit.

(B) Prior Art As a document reading apparatus including a thick document reading unit for reading and scanning a thick document such as a book and a sheet document reading unit for reading and scanning a sheet document, for example, Japanese Patent Publication No. 58-375.
No. 36, etc. FIG. 3 is a schematic front view showing this conventional apparatus. (1) is an original placing table for thick originals, and (2) is a fluorescent lamp for illuminating the original on the placing table (1). on the other hand
(3) is a document insertion table on which a sheet document is placed. (4) irradiates a sheet original conveyed by a fluorescent lamp. (6) to (8) is a fixed mirror, (9) is a rotatable mirror, (10) is a lens,
An image is formed on the photoconductor (11) by these optical means. The reading positions of the sheet document reading unit (20) and the thick document reading unit (21) are changed by the mirror (9). This mirror (9) is equipped with a document presence sensor (22) (2
The motor (24) is driven by the signal from 3), and when there is a document in the sheet document reading unit (20), the mirror
(9) is configured to leave the optical path.

(C) Problems to be solved by the invention However, in the above-mentioned conventional device, the mirror (9)
In order to move the motor, a drive source such as a motor or a solenoid is required, which causes a problem that the device becomes expensive.

The present invention has been made in view of the above-mentioned problems,
It is an object of the present invention to provide an original reading device that has a simple mechanism and does not require a drive source dedicated to driving a mirror.

(D) Means for Solving Problems The present invention is directed to a rotatable selection mirror for selecting an optical path from a thick original reading unit and a sheet original reading unit, and this selection mirror is always used as a sheet original reading unit. Urging means for urging the selection mirror, a drive shaft attached to the selection mirror for rotating the selection mirror, and a motor shaft for sub-scanning of the sheet document reading unit via a clutch on the drive shaft. And a drive transmission unit connected to the drive transmission unit.

(E) Function In the present invention, the optical path can be selected by driving the selection mirror by the sub-scanning motor for conveying the sheet original.

(F) Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In these figures, (100) is a platen made of transparent glass or the like of the thick document reading unit (21), and (101) is a platen (100).
The manuscript placed on. Reference numeral (102) is an original pressing member that presses the original (101) closely against the original table (100). Reference numeral (103) is a fluorescent lamp installed on a first moving table (not shown), and illuminates the original (101). Furthermore, the first moving table has a first mirror.
(104) is also provided. Reference numeral (105) is a second mirror, and reference numeral (106) is a third mirror, both of which are installed on a second moving table (not shown). The first moving table and the second moving table move and scan in parallel with the document surface, and when the scanning speed of the first moving table is V, the second moving table moves and scans at a scanning speed of 1 / 2V.
The driving means for the first and second moving bases is disclosed in JP-A-56-
Since it is described in detail in Japanese Patent No. 132350, etc., the description thereof will be omitted here.

Reference numeral (107) is an optical lens for forming an image of the original scanning surface on the CCD (108).

A separation roller (109) separates and feeds the originals stacked and placed on the original placing table (111) of the sheet original reading unit (20) by the action of the separating rubber piece (110) and the like. To do. (112) to (114) are paper feed rollers, and these rollers (112) (113)
The original is fed by the pressing rollers (115), (116) and (117) that are biased and pressed by (114). (118) is a sub-scanning motor of the sheet original reading unit, the driving force of the motor (118) by a combination of a mini-pitch timing belt and pulley,
It is transmitted to the rollers (109), (112), (113) and (114). (119)
Reference numerals (122) to (122) denote a light emitting diode and a phototransistor, which are installed as a document presence / absence detection unit. (1
Reference numeral 23) is a fluorescent lamp that illuminates the scanning position of the conveyed document. (12
4) is a rotary shaft, which is used to open the document passage when a document is jammed in the passage. (125) is a selection mirror, and a drive shaft (126) is passed through a mirror holder (not shown).
And is rotatably installed on the base body. (127) is an arm member fixed to the shaft (126).
A tension spring (128) is attached to one end (127a) of the arm member (127).
Is stretched, and the arm member (127) is always biased and pressed by the stopper (129) by the biasing force of the spring (128). A projecting portion is formed on the other end (127b) of the arm member (127) and is disposed so as to be engageable with the locking member (130).
The locking member (130) is constantly urged by a tension spring (131) in a direction to engage with the arm member (127). (13
2) is a stopper pin of the member (130). (133) is the axis
An arm member that allows the (134) to rotate, and the member (133)
Is swingably connected to the locking member (130) by a connecting rod (135). An engagement pin (136) is arranged at one end (133a) of the arm member (133). The pin (136) is fixed in a protruding manner so as to engage with the back surface of the second moving table (137). (138) is a mini pitch timing pulley,
It is attached to the shaft (126) via a one-way clutch (139). A timing belt (142) is stretched between the pulley (138) and a mini pitch timing pulley (141) fixed to the shaft (140) of the roller (113). Reference numerals (143) and (144) are transmissive photointerrupters, and when combined with the disc (145) fixed to the shaft (126), the mirror (125) causes an optical path to the thick document reading unit and the sheet document reading unit. It is a sensor for detecting a first position and a second position for switching between.

Next, the present invention will be described in detail together with its operation.

When the mirror (125) is in the state shown by the solid line in FIG. 1, that is, when it is set in the sheet original reading section, the thick original (1
00) is set on the mounting table (101) and the transmission switch or copy switch is pressed, and then the sensors (119) (120)
Since the original is not set by, the motor (118)
Rotates in the reverse direction and rotates in the direction of arrow B. At this time, the pulley (13
8) rotates in the direction of the arrow. At this time, the clutch 139 is engaged to rotate the drive shaft 126 in the clockwise direction and rotate the mirror 125 to the position indicated by the broken line in FIG. 1 against the force of the spring 128. At the same time, the disc (145) shields the sensor (143) from the center, and the motor (118) is stopped. Next, the first movable table and the second movable table (137) move to the right at the scanning speeds V and V / 2, respectively, and the document surface is passed through the mirrors (104) (105) (106) and the lens (107) CCD (10
8) An image is formed on it and photoelectrically converted. At this time, the second moving stand (137)
When is moved to the right from the standby position, the pin (136) engaged with the back surface of the stand (137) is returned by the force of the spring (131), and the locking member (130) causes the arm member ( 127) and the mirror (125) is returned in the counterclockwise direction A by the force of the spring (128) or the like in the event of an accident such as a power failure and collides with the movable table (137) or the like. To prevent that.

Next, the original is inserted into the sheet original reading unit and the sensor (1
When the document is detected by (19) and (120), first, the first and second moving bases (137) are set and confirmed at the standby position. In this standby position, the back surface of the stand (137) engages the engagement pin (136) to the left to move the locking member (130) to the spring (131).
Is rotated against the protrusion of the arm member (127).
The engagement with (127b) is released. At this time, the arm member (1
27) is urged in the counterclockwise A direction by the spring (128). The one-way clutch (139) is connected to the pulley (138) in the same manner as being rotated relatively in the engaging direction, does not return suddenly, and prevents the mirror (125) from being impacted. is doing. At this time, the motor (118) is energized or locked, or if the load such as the non-energization holding torque is large, the mirror (125) is held stopped. The motor (118) for sending the document to the scanning reading position
Is rotated in the A direction, the clutch (139) is rotated in the idling direction (counterclockwise direction), and the shaft (126) is returned to the counterclockwise direction by the spring (128). Furthermore, the stopper (129) is engaged and stopped, and the mirror (125) is stopped at the position indicated by the solid line in FIG. Even if the motor (118) is further rotated, the motor rotates because the clutch (139) part idles.
It does not become the load of (118). At this time, the disk (145) in the sensor (144) is removed, and it is detected that the mirror (125) is set at the second position of the sheet document reading unit. At this time, the manuscript is transferred to the same C as above through the fourth mirror (146) and the selection mirror (125)
It is photoelectrically converted by the CD (108).

Thus, according to the present invention, when the operation switch is pushed when the document is not detected by the sheet document reading unit (20), the sub scanning motor (118) of the sheet document reading unit (20) is reversed to make the thick document thick. When the mirror (125) is selectively driven to the document reading unit (21) and the document is detected, the document can be automatically read by conveying the document. That is, the mirror (125) is selected so that the optical path from the sheet document reading unit (20) is imaged on the CCD (108).

(G) Effect of the Invention As described above, according to the present invention, the optical path from the thick original reading unit and the sheet original reading unit is simple and does not require a dedicated drive source for driving the selective mirror. Can be selected.

Further, when the optical path from the sheet document reading unit is selected by the selection switching, the mirror can be automatically set by conveying the sheet by linking the switching of the mirror with the feeding operation of the sheet document.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention, FIG. 1 is a schematic side view, and FIG. 2 is a perspective view showing a selective mirror driving unit. FIG. 3 is a schematic side view showing a conventional device. (118) …… Sub-scanning motor, (125) …… Selective mirror, (12
8), (131) …… Spring, (136), (138) …… Timing pulley, (137) …… One-way clutch, (126) …… Drive shaft,
(127) …… arm member, (130) …… locking member.

Claims (1)

[Scope of utility model registration request] 1. A document reading device of a facsimile apparatus comprising a thick document reading unit in which an optical system moves and a sheet document reading unit in which a document moves, which is immovable in order to select an optical path from both document reading units. A selection mirror that rotates into two positions, a thick document reading position and a sheet document reading position, and a drive that is fixed to one end of the selection mirror and rotates the selection mirror to the two positions at the fixed position. A shaft, an urging unit that urges the selection mirror to rotate to the sheet document reading position, a sub-scanning motor that conveys a sheet document, and a transmission unit that transmits the driving force of the sub-scanning motor to the drive shaft. And a clutch interposed in the transmission means for transmitting the driving force of the sub-scanning motor only in a direction against the urging of the urging means. When the thick original is read, the sub-scanning motor is rotated in the other direction by rotating in one direction to convey the sheet original and idling the clutch, and the driving force of the sub-scanning motor is transmitted through the transmission means to the drive shaft. To the thick document reading position, and the selection mirror is rotated to the thick document reading position.