JPS61201229A - Original scanning device - Google Patents

Abstract

PURPOSE:To facilitate the assembly and adjustment of a scanner and to obtain stability during a run by using different members as a scanner main body part and a part to be guided on a guide rod and coupling those members with each other rotatably around a axis perpendicular to a scanning direction and a scanner lengthwise direction. CONSTITUTION:A scanner 40 consists of a bearing part 42 where a bearing 41 fitted onto the guide rod 10 is fitted and the main body 44 where a mirror 43 is fitted as different members. The bearing part 42 and main body part 44 are coupled which each other by a stepped screw or stepped calking pin 45 rotatably around the axis perpendicular to the scanning direction and scanner lengthwise direction. A slide member 21 is fitted on the reverse surface of the end part of the scanner main body part 4 at the opposite side from the side where the bearing part 42 is fitted. When the scanner is incorporated in a machine body, the scanner is aligned to a reference member such as a main body scale and coupled with a drive wire, thus obtaining the position relation of the scanner with the machine body unequivocally.

Description

TECHNICAL FIELD The present invention relates to an original scanning device such as a copying machine that scans a fixed original by moving a scanner carrying a part of a mirror of an imaging optical system.

Conventional technology Document scanning in electrophotographic copying machines, document reading devices, etc. is performed by fixing the document on a contact glass and moving a part of the mirror of the imaging optical system, or by fixing the optical system and scanning the document. There is also one that is done by moving the . FIG. 6 shows a typical example of an imaging optical system of a copying machine in which the original is fixed and the optical system is moved. In the figure, a document 2 placed on a contact glass 1'2 is slit-illuminated by a light source B, and the reflected light is reflected by a first mirror 4, a second mirror 5, a sixth mirror 6 arranged as shown, and an image is formed. The image is formed on a photosensitive drum 9 via a lens 7 and a fourth mirror 8. 1st Mila.

-4 reflects the light flux from the original in a direction parallel to the original surface, and the second and third mirrors 5 and 6 are orthogonal to each other, and the intersection angle of both mirrors is The bisector is arranged so as to coincide with the scanning direction parallel to the original. A first scanner 1 includes a light source 3 and a first mirror 4 slidably mounted on a guide rod 10 extending in the scanning direction.
1, the second and sixth mirrors 5 and 6 are integrally supported on a second scanner 12 which is slidably provided on a guide rod 10, and the first scanner 11 is moved at a constant speed. ,
By moving the second scanner 12 in the same direction at a speed of V/2 and rotating the photosensitive drum at a circumferential speed of V, the distance between the document and the lens is always kept constant. When a document is slit-scanned, a mark is created.

As a means for synchronizing the first scanner 11 and the second scanner as described above and moving them at the speeds of V and V/2, respectively, a movable pulley is used because the structure is simple, the inertial mass is small, and the adjustment is easy. A wire drive device in which the speed of the second scanner is equal to the speed of the wire using the principle is widely used.

FIG. 4 shows one example of this, in which a first scanner 11 whose one end is slidably supported by a guide rod 10 has a drive wire 14 that is moved at a speed of 2 by a scanner motor 16.
is fixed. A movable pulley 15 is pivotally supported at the end of the second scanner 12 whose one end is slidably supported by the guide rod 10, and as shown in the figure, a drive wire i4 wound around a plurality of fixed boars is attached to both sides of the second scanner 12. It is wound around a movable pulley 15. The other end of each scanner 11.12 is supported on a guide rail via a sliding member. Therefore, when the wire 14 is driven by the scanner motor 13 at a speed of {circle around (2)}, the first scanner 11 moves at a speed of V and the second scanner 12 moves synchronously at a speed of V/2 in the same direction. The wire drive shown in FIG. 4 is driven at only one end of each scanner. Further, this wire handle is for a variable magnification optical system, and by rotating the pulley 17, the second scanner 12 can be displaced to a position corresponding to the magnification prior to scanning movement.

FIG. 5 shows an example in which both ends of the scanner are driven synchronously by drive wires i4 and 14' in order to reduce the deviation in movement of both ends of the scanner, and the end on the guide rail 16 side is driven. The wire 14' is wound around the same scanner motor 13 as the wire 14 that drives the end on the guide rod 10 side, and is simultaneously driven in the same direction and at the same speed, passing through the corner pulley 18 to the back side of the figure. It is wound from both sides around a moving pulley 15' which is fixed to the back end of the first scanner 11 and pivotally supported by the back end of the second scanner 12. Furthermore, the fifth
In the wire handle shown in the figure, both wires 14 and 14' are fixed directly to the machine frame at one end and via a tension spring at the other end.

In the case of both-side drive, as illustrated in FIG. 5, one side is the guide rod 10, which is fitted into the bearing member 20 and slid thereon, and the other side is placed on the guide rail 16'' through the sliding member 21. There are two methods: one method is to put it on the guide rails on both sides via sliding members. In the latter case, it is stable as a load and can be mounted freely in relation to the main body of the apparatus, but it is unstable because the vertical regulation depends on the weight of the scanner. On the other hand, in the former method, the vertical and horizontal positions are stabilized because they are regulated by guide rods.

However, a major drawback of this method is that it is difficult to obtain a perpendicularity between the direction of the bearing part of the scanner and the longitudinal direction of the mirror, which requires time and cost.

When making the scanner by aluminum die-casting, -4= As shown in FIG. to achieve accuracy.

When the scanner is made of sheet metal, as shown in FIG. 7, the main body part 61 that receives the mirror of the scanner roller 0 and the bearing part 32 are made of two parts of sheet metal, and the two parts are welded to form a right angle for accuracy. In either case, machining is difficult, expensive, and has a low yield because it is difficult to obtain a squareness with high machining accuracy. In addition, the installation of the guide rod to the machine body is also greatly affected by stacking tolerances, so even if only the perpendicularity of the bearing part to the guide rod is determined, the relationship with the scale and lens optical axis is not guaranteed when looking at the machine as a whole. I cannot say that it has been done.

Purpose: In view of the above-mentioned problems of conventional scanners in which one side is supported by a guide rod and both sides are scan-driven, the present invention provides advantages in ease of assembling, ease of adjustment, and stability during running of the scanner. An object of the present invention is to provide a document scanning device that can be used.

Structure: In order to achieve the object described in item 1, the present invention provides a scanner that is slidably supported on one side by a guide rod via a bearing and that is driven to scan on both sides, and includes a scanner main body portion carrying a mirror, and a guide rod. The scanner is characterized in that the guided portion guided by the scanner is a separate member, and these members are rotatably connected to each other around an axis perpendicular to the scanning direction and the longitudinal direction of the scanner.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIGS. 1 and 2 are diagrams showing an example of a scanner to which the present invention is applied.

In the figure, in the scanner 40, a bearing part 42 to which a bearing 41 which is slidably fitted to the guide rod 10 is attached, and a main body part 44 to which a mirror 46 is attached are formed as separate members. The main body portion 44 is rotatably coupled to the main body portion 44 by a stepped screw or stepped caulking pin 45 about an axis perpendicular to the scanning direction and the longitudinal direction of the scanner. A sliding member 21 is attached to the lower surface of the end of the scanner body 44 opposite to the side on which the bearing 42 is attached, and the scanner 40 is placed on the guide rail 16 via this.

Note that FIGS. 1 and 2 show an embodiment in which the present invention is applied to a first scanner, and screws 46 for fixing a drive wire are provided at both ends of the scanner body 44. Second
In the case of Sukiyana, it goes without saying that a moving bar will be installed instead.

By configuring the scanner as described above, when assembling the scanner to the machine body, by aligning the scanner with the reference member such as the body scale and connecting it to the drive wire, the positional relationship of the scanner with respect to the machine body can be intentionally set. can be produced. Since both sides are driven, the positional relationship will not change once determined.

Note that if the wires on both sides shift from each other at the drive pulley, the positional relationship will shift, but in the case of both-side drive, both ends of the wire are usually fixed to the machine frame as shown in Figure 5, so this is unlikely. That's not it.

As a result of the above, in the processing of the scanner, there is no need to create a squareness, making it possible to reduce the cost of processing the scanner.

Effects As described above, according to the present invention, it is possible to eliminate the need to square the bearing part and the mirror part, which is difficult and labor-intensive in machining the scanner of a document scanning device.
This is effective in reducing the manufacturing cost of the device.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a scanner of a document scanning device to which the present invention is applied, FIG. 2 is a perspective view thereof, FIG. 6 is a sectional view showing the configuration of a general document scanning optical system, and FIG. 4 5 is a perspective view showing an example of a scanner drive device with drive on one side, FIG. 5 is a perspective view showing an example of a scanner drive device with drive on both sides, and FIGS. 6 and 7 show examples of the structure of a conventional scanner. FIG. 10... Guide rod 14, 14'... Drive wire 16... Guide rail 21... Sliding member 4
0...Scanner 41...Bearing 42...Bearing part 46...Mirror 44...Scanner body part 45...Coupling pin Fig. 1

Claims (1)

[Claims] A guide that carries part of the mirror of the optical system, one end of which is slidably supported via a bearing on a guide rod extending in the scanning direction, and the other end of which extends in the scanning direction via a sliding member. In a document scanning device such as a copying machine that optically scans a document by a scanner placed on a rail and driven to scan both ends simultaneously, the document is guided by a scanner main body that carries a mirror of the scanner and a guide rod. What is claimed is: 1. A document scanning device characterized in that the guided portion is a separate member, and these members are rotatably connected to each other around an axis perpendicular to the scanning direction and the longitudinal direction of the scanner.