JP3047722B2 - Copier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine having an optical device for scanning a document and forming an optical image of the document on a photoelectric conversion element.

[0002]

2. Description of the Related Art Conventionally, an example of an arrangement of shafts when two wires are used to drive a scanning system of an optical device of a copying machine and a shaft is used to transmit the drive of the two wires. This will be described with reference to the drawings. FIG. 10 shows an optical device of a conventional copying machine. In FIG. 10, a document is irradiated from a lamp 101 onto a
02, the image is reflected and sent to the second reflecting mirror 103, the image is sent from the second reflecting mirror 103 to the reduction lens 104, and the image is reduced by the reduction lens 104 and irradiated to the photoelectric conversion element 105. The lamp 101 and the first reflecting mirror 102
6, the original is scanned by moving the scanning system of the frame 106 and the second reflecting mirror 103.

A description will now be given of the routing of the wire front 107 and the wire back 108 for transmitting the driving force for moving the frame 106 and the second reflecting mirror 103. 1 before the wire
07 and the end of the wire back 108 are fixed to an optical frame (not shown) by a fixing member 109 and turned back by a pulley 110 fixed to the second reflecting mirror 103 to fix the fixing member 1.
It is folded back by a pulley 111 which is arranged under the position 09 and is fixed to an optical frame (not shown). The frame 106 is fixed to a wire between the pulley 110 and the pulley 111 with a fixing tool 112. The wire front 107 folded by the pulley 111 is wound around the wire pulley 113, and the wire back 108 is the wire pulley back 114
Is wrapped around. After the wire is wound around the front 113 of the wire pulley and the back 114 of the wire pulley, the pulley 11 is fixed to an optical frame (not shown).
5, is again turned by the pulley 110, is disposed on the pulley 115, is mounted on an optical frame (not shown), and is mounted on the extension coil spring 116.

[0004] The power of the drive motor 117 is transmitted from the motor gear 118 through the reduction gear 119 to the front 113 of the wire pulley. Since the front 113 of the wire pulley and the rear 114 of the wire pulley are connected by a pulley shaft 120 supported by a bearing fixed to an optical frame (not shown),
13 and the wire pulley back 114 can rotate simultaneously.

With the above configuration, the speed ratio of the second reflecting mirror 103 is １ ／ of that of the frame 106,
Is always の of the frame 106.

Further, the tension coil spring 116 constantly applies tension to the wire to suppress unevenness of the scanning system due to rattling of the pulley or vibration in the copying machine. As a result, blurring of the copied image is reduced, and a clear copied image can be obtained.

In the above-described procedure for assembling the wire and the extension coil spring of the optical apparatus of the conventional copying machine, one hook of the extension coil spring is hooked on the optical frame, and the other hook is hooked on the end of the wire. .

[0008]

The arrangement of the pulley shaft 120 of the optical apparatus of the conventional copier is arranged at a position where it does not hinder the operation of the frame 106 and the second reflecting mirror 103, as shown in FIG. It is disposed outside the scanning system of the frame 106 and the second reflecting mirror 103 on the right side of the operating range of the second reflecting mirror 103 and on the left side of the operating range of the frame 106. By disposing the pulley shaft 120 outside the moving range of the scanning system, the drive motor 117
Other drive system components such as wire and pulleys also need to be placed near the outside of the scanning system, and the length of the optical device in the scanning direction is added to the length of the movement range of the scanning system component and the length of the drive system component Therefore, the length of the optical device in the scanning direction becomes longer than necessary. In a conventional method of assembling a wire and a tension coil spring of an optical device of a copying machine, the tension coil spring may be pulled by a force higher than the tension applied to the wire when connecting the wire and the tension coil spring. At this time, the tension coil spring may be pulled with a force higher than the elastic limit. If the tension coil spring is stretched beyond the elastic limit, appropriate tension cannot be applied to the wire, and a clear copied image cannot be obtained. In addition, in the conventional method of assembling a copying machine, since the assembling work is performed at the inner corner of the optical frame, there is a problem that the work is very difficult.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a copying machine which can reduce the size of the copying machine and effectively use the area occupied by the copying machine .

[0010]

In order to achieve this object, the present invention provides a scanning system having a lens and a photoelectric conversion element.
And a scanning system provided on both sides with respect to the moving direction of the scanning system.
Drive the wire and drive this wire to scan
A wire pulley located inside the range of movement of the
And a shaft of a wire pulley of
Is focused by the lens between the lens and the optical conversion element.
The exposure light beam passes through the outside.

[0011]

With this configuration, the pulley shaft is arranged inside the scanning system, so that other driving system components such as a drive motor and a wire pulley can be arranged inside the scanning system. The length in the scanning direction is only the length of the moving range of the scanning system components, and it is possible to provide an optical device in consideration of the miniaturization of the copying machine and the effective use of the area occupied by the copying machine.

[0012]

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical apparatus according to one embodiment of the present invention will be described below.
This will be described with reference to the drawings. FIG. 1 shows a copying machine having a configuration according to the present invention. An optical device 1, an image forming mechanism 2 for forming an image by exposure by the optical device 1, and a paper feeder for feeding paper to the image forming mechanism 2 are shown. Paper mechanism 3. The optical device 1, the image forming mechanism 2, and the paper feed mechanism 3 may be configured integrally or may be configured separately. In particular, the paper feed mechanism 3 has a configuration in which a plurality of separate paper feed units 3a are stacked for each paper size.

The optical device 1 includes a lamp 5 which moves under the platen glass 4 to scan an original, a first reflecting mirror 6, and a second reflecting mirror which moves at a speed ratio of 1/2 with respect to the first reflecting mirror 6. A mirror 7, a lens 8, a photoelectric conversion element 9 for converting an exposure image into a digital signal, and a scanning optical system 10 for controlling emission of a laser beam by a signal from the photoelectric conversion element 9 and performing scanning and recording.

The image forming mechanism 2 includes a photosensitive drum 11 and a charging unit 12, a side erase 13,
It has a developing unit 14, a transfer unit 15, a cleaning unit 16, and the like, and forms a toner image corresponding to a document image to be exposed on the photosensitive drum 11 by a general electrophotographic method,
The image is transferred onto the fed sheet 19. Further, a fixing device 21 for fixing the sheet 19 to which the toner image has been transferred, a pair of discharge rollers 22 for discharging the sheet on which the toner image sent from the fixing device 21 is fixed and the copy is completed, A tray 26 is provided.

The paper feed mechanism 3 has a pair of registration rollers for stopping the leading edge of the paper 19 sent one by one by the paper feed roller 17 and the sub-roller 18, aligning the leading edge, and adjusting the timing of feeding. The paper 20 is fed before the transfer unit where the photosensitive drum 11 and the transfer unit 15 face each other. Further, it has a paper feed cassette 23 in which papers 19 of different sizes are stored, and a paper feed unit 3 a composed of a paper passage 24. The sheet feeding units 3a are stacked for each sheet size to enable sheet feeding corresponding to each size. Further, reference numeral 25 denotes a manual tray for manually feeding another sheet.

Further, these paper passage portions are separated from the paper passage portions so that the paper jam can be easily handled.
It has a unit configuration that can be opened and closed.

FIG. 2 shows an optical device according to an embodiment of the present invention. In FIG. 2, a document is irradiated with light from a lamp 5 and is reflected by a first reflecting mirror 6 to form a second reflecting mirror 7.
Then, the image is sent from the second reflecting mirror 7 to the lens 8, and the image is reduced by the lens 8 and irradiated on the photoelectric conversion element 9. The lamp 5 and the first reflecting mirror 6 are held by a frame 27, and the original is scanned by moving a scanning system of the frame 27 and the second reflecting mirror 7.

A wire front 28a and a wire back 2 for transmitting a driving force for moving the frame 27 and the second reflecting mirror 7
8b will be described. The ends of the front 28a of the wire and the end 28b of the wire are fixed to an optical frame (not shown) by a fixing portion 29, and the pulley 30 fixed to the second reflecting mirror 7 is folded back to be disposed below the fixing portion 29. The pulley 31 fixed to the frame is turned back. In the wire between pulley 30 and pulley 31,
7 is fixed by a fixture 32. The wire front 28a of the turned back pulley 31 is wound around the wire pulley front 34a, and the wire back 28b is the wire pulley back 34
b. After the wire is wound around the wire pulley, the pulley 35 fixed to the optical frame is turned back, and the pulley 30 is turned again to be attached to the extension coil spring 36 attached to the spring fixing plate disposed on the pulley 35. ing.

The power of the drive motor 37 is the motor gear 3
8 through the reduction gear 39, through the front of the wire pulley 34
a. Since the front wire pulley 34a and the rear wire pulley 34b are connected by a pulley shaft 40 supported by a bearing fixed to the optical frame, the front wire pulley 34a and the rear wire pulley 34b can rotate simultaneously.

With the above configuration, the speed ratio of the second reflecting mirror 7 is 1/2 of the frame 27, and the moving distance of the second reflecting mirror 7 is always 1/2 of the frame 27.

Further, the tension coil spring 36 constantly applies tension W to the wire to suppress the speed irregularity of the scanning system due to the rattling of the pulley and the vibration in the copying machine. As a result, blurring of the copied image is reduced, and a clear copied image can be obtained.

The position of the pulley shaft 40 will be described with reference to the drawings. FIG. 3 is a sectional view of an exposure path of the optical device according to the embodiment of the present invention. In FIG.
The light flux 42 of the image of the original on the platen glass 4 is reflected by the first reflecting mirror 6 and the second reflecting mirror 7, passes through the lens 8, and is like the light flux 43 before being irradiated on the photoelectric conversion element 9. Focused on. Therefore, the space used for the light beam 43 in the vicinity of the photoelectric conversion element 9 is reduced, so that the pulley shaft 40 can be disposed in the empty space, and the pulley shaft is disposed inside the moving range of the scanning system. Drive system components such as drive motors and wire pulleys can be placed inside the scanning system, and the length of the optical device in the scanning direction is only the length of the moving range of the scanning system components, miniaturizing the copier. And an optical device in which the effective use of the area occupied by the copier can be provided.

In the figure, the position of the pulley shaft 40 is arranged below the focused light after passing through the lens and before being irradiated on the photoelectric conversion element, but may be arranged above the focused light. .

Next, a wire assembling procedure in an embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows a spring mounting member 46 inserted into the optical frame 44 from the outside of the optical frame 44 through the opening 45. The width of the spring mounting member 46 outside the optical frame 44 has a width that cannot pass through the opening 45. One hook portion of the extension coil spring 36 is hooked on the hook portion inside the optical frame 44 of the spring mounting member 46, and the wire depth 28 b is attached to the other hook portion of the extension coil spring 36. At this time, the tension coil spring 3
6 gives a very small tension to the wire back 28b,
The tension may be zero as long as the wire depth 28b does not come off the pulley or the like.

FIG. 5 shows a state where the wire assembly is completed. The spring mounting member 46 is taken out of the optical frame 44 and
The optical frame 44 is fixed with screws 47. A tension is generated in the wire depth 28b by the moving distance of the spring mounting portion when the spring mounting member 46 is taken out of the optical frame 44, and a necessary tension for the wire can be obtained. 4 and 5
Has been described in the case of the wire depth 28b, but the same applies to the wire front 28a. At the time of the operation until the spring mounting member 46 to which the wires 28a and 28b are mounted via the tension coil spring 36 is taken out of the optical frame 44 and fixed with the screw 47, the tension coil spring 3
6 is a force greater than the tension required for the wires 28a, 28b,
Since there is no need to pull the spring mounting member 46 to work, no force exceeding the elastic limit is applied to the extension coil spring 36 during the assembling work, so that appropriate tension can be applied to the wire, and a clear copied image can be obtained. It is possible to provide an optical device that can achieve the above and can easily perform the assembling operation outside the optical frame. Further, in the example of the wire assembly configuration in this embodiment, the spring mounting member is formed in a plate shape. However, the spring mounting member need not be a plate shape, and the opening of the optical frame may not be a square hole. Further, in a state where tension is applied to the wire, other fixing means may be used without fixing the spring mounting member with the screw.

Next, another embodiment of the wire assembling structure of the present invention will be described with reference to the drawings.

FIG. 6 shows a spring mounting member 50 inserted from the outside of the optical frame 48 through the opening 49 into the inside of the optical frame 48. The width of the spring mounting member 50 outside the optical frame 48 has a width that cannot pass through the opening 49. One hook portion of the extension coil spring is hooked on the distal end portion 51 of the inner portion of the optical frame 48 of the spring attachment member 50, and a wire is attached to the other hook portion of the extension coil spring. At this time, the tension given to the wire by the tension coil spring is extremely small, and the tension may be zero as long as the wire does not come off the pulley or the like.

FIG. 7 shows the state when the wire assembly is completed. The upper hole of the opening 49 of the optical frame 48 is
The lower hole of the opening 49 has such a size that the portion between the lengths L of the spring mounting member 50 cannot be passed through. Spring mounting member 5
In the case of No. 0, since the tension coil spring pulls the inside of the optical frame 48, the portion between the lengths L of the spring mounting member 50 is taken out of the optical frame 48, moved to the lower hole of the opening 49, and moved to the lower hole. It gets stuck around and stabilizes. The tension is generated in the wire by the moving distance L of the spring mounting member when the spring mounting member 50 is taken out of the optical frame 48, and the required tension is obtained.

The wire is pulled out by a length L outside the optical frame 48 from the optical frame 48 via a tension coil spring, and the wire is hooked around the lower hole of the opening 49 to stabilize the wire. Since the coil spring does not need to pull the spring mounting member 50 with a force higher than the tension required for the wire, there is no need to apply a force higher than the elastic limit to the tension coil spring during the assembly work. An optical device that can obtain a clear copy image, can easily perform assembling work outside the optical frame, and can assemble without fixing the spring mounting member to the frame with screws or the like. Can be provided. Further, in the wire assembly configuration example in the present embodiment, the cross-sectional shape of the spring mounting member and the shape of the opening are represented by a circle, but may be an ellipse or a rectangle other than a circle.

Next, another embodiment of the wire assembling structure of the present invention will be described with reference to the drawings. FIG. 8 shows a spring mounting member 62 inserted from the outside of the optical frame 60 through the opening 61 into the inside of the optical frame 60. The maximum width A of the spring mounting member 62 is a width that cannot pass through the opening 61 of the optical frame 60, and has a plurality of widths B, C, and D that are smaller than the maximum width A, and a mounting portion for a tension coil spring at the tip. ing. The opening is the opening adjustment plate 6
3 is slid in the H direction so that the opening width is E,
An aperture adjusting plate 63 is fixed to the optical frame 60 with screws 64.
At one end of the extension coil spring, hook the tip of the inner portion of the optical frame 60 of the spring mounting member 62,
Attach the wire to the other hook of the extension coil spring. At this time, the tension given to the wire by the tension coil spring is extremely small, and the tension may be zero as long as the wire does not come off the pulley or the like.

FIG. 9 shows the state when the wire assembly is completed. The spring mounting member 62 is drawn out by a length M outside the optical frame 60. The opening adjusting plate 63 is slid in the direction H so that the width C of the portion between the lengths M of the spring mounting members 62 does not enter the inside of the optical frame 60, and the opening width of the opening 61 is reduced. By fixing the 63 to the optical frame 60 with the screw 64, the spring mounting member 62 is hooked on the opening adjusting plate 63 and stabilized. The tension is generated in the wire by the moving distance M of the spring mounting member 62 when the spring mounting member 62 is taken out of the optical frame 60, and the required tension is obtained. Due to various variations such as the length of the wire, the spring coefficient of the extension coil spring, the size of the optical frame, and the assembly accuracy, a slight difference is required in the tension required for the wire. For this reason, the moving distance M of the spring mounting member 62 is changed to L or N, and the opening adjusting plate 63 is slid correspondingly to adjust the opening width from F to E or G, and the spring mounting member 62 is adjusted.
Is stably stuck on the opening adjusting plate 63, and the tension required for the wire can be adjusted. A spring mounting member 62 mounted via a tension coil spring is pulled out of the optical frame 60 to a length M or L or N corresponding to the variation in required tension, and an opening adjusting plate 63 attached to the opening 61 is pulled out. By adjusting the opening width to F, E, or G, and during the operation until the optical frame 62 is stuck outside and stabilized, the tension coil spring pulls the spring mounting member 62 with a force higher than the tension required for the wire. Since there is no need to work, no force exceeding the elastic limit is applied to the tension coil spring during assembly work, and it is possible to cope with the difference in the appropriate tension required for the wire generated due to various variations during assembly, While obtaining a clear copy image,
An assembling operation can be easily performed outside the optical frame, and it is possible to provide an optical device which can be assembled by a simple operation without having to fix the spring mounting member to the frame with screws or the like.

[0033]

As described above, according to the present invention, the light beam is focused after passing through the lens and before being irradiated on the photoelectric conversion element, and the pulley shaft is disposed in a space vacant from the photoelectric conversion element. The pulley shaft can be arranged inside the operation range of the scanning system, and the drive system components such as the drive motor and the wire pulley can also be arranged inside the operation range of the scanning system. Only the length of the moving range of the scanning system components is provided, and it is possible to provide an optical device in consideration of miniaturization of the copying machine and effective use of the occupied area of the copying machine.

[0034]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a copying machine having an optical device according to the present invention.

FIG. 2 is a perspective view in which a part of an optical system according to an embodiment of the present invention is omitted.

FIG. 3 is a sectional view of an optical system according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a first position of a fixing member in the optical device of the present invention.

FIG. 5 is a perspective view showing a second position of a fixing member in the optical device of the present invention.

FIG. 6 is a perspective view showing a first position of a fixing member in an optical device according to a second embodiment of the present invention;

FIG. 7 is a perspective view showing a second position of the fixing member in the optical device according to the second embodiment of the present invention;

FIG. 8 is a perspective view showing a first position of a fixing member in an optical device according to a third embodiment of the present invention.

FIG. 9 is a perspective view showing a second position of the fixing member in the optical device according to the third embodiment of the present invention.

FIG. 10 is a perspective view in which a part of an optical device of a conventional copier is omitted.

[Explanation of symbols]

 Reference Signs List 1 optical device 4 platen glass 5 lamp 6 first reflecting mirror 7 second reflecting mirror 8 lens 9 photoelectric conversion element 27 frame 28a wire-front 28b wire-back 29 fixing portion 30 pulley 31 pulley 32 Fixture 34a Wire pulley front 34b Wire pulley depth 35 pulley 36 Tension coil spring 37 drive motor 38 motor gear 39 reduction gear 40 pulley shaft 44, 48 , 60 Optical frame 45, 49, 61 Opening 46, 50, 62 Spring mounting member 47, 64 Screw 51 Tip 63 Opening adjusting plate

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 1/04-1/207

Claims (1)

(57) [Claims] A scanning system <br/> and a 1. A lens and the photoelectric conversion element, a wire for driving the scanning system is provided on both sides with respect to the moving direction of the scanning system, the scanning and driving the wire
A wire pulley located inside the range of movement of the
And a shaft of a wire pulley of
Copier, characterized in that through the outer of the exposure light beam focused by the lens between the lens and the optical conversion element.